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Subject: Re: [Patch V6 7/8] usb: gadget: Add UDC driver for tegra XUSB device
 mode controller
To:     Chunfeng Yun <chunfeng.yun@mediatek.com>
CC:     <balbi@kernel.org>, <gregkh@linuxfoundation.org>,
        <thierry.reding@gmail.com>, <jonathanh@nvidia.com>,
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References: <1565257046-9890-1-git-send-email-nkristam@nvidia.com>
 <1565257046-9890-8-git-send-email-nkristam@nvidia.com>
 <1565613783.23705.49.camel@mhfsdcap03>
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From:   Nagarjuna Kristam <nkristam@nvidia.com>
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Date:   Tue, 13 Aug 2019 15:46:36 +0530
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On 12-08-2019 18:13, Chunfeng Yun wrote:
> On Thu, 2019-08-08 at 15:07 +0530, Nagarjuna Kristam wrote:
>> This patch adds UDC driver for tegra XUSB 3.0 device mode controller.
>> XUSB device mode controller supports SS, HS and FS modes
>>
>> Based on work by:
>>   Mark Kuo <mkuo@nvidia.com>
>>   Hui Fu <hfu@nvidia.com>
>>   Andrew Bresticker <abrestic@chromium.org>
>>
>> Signed-off-by: Nagarjuna Kristam <nkristam@nvidia.com>
>> Acked-by: Thierry Reding <treding@nvidia.com>
>> ---
>>  drivers/usb/gadget/udc/Kconfig      |   11 +
>>  drivers/usb/gadget/udc/Makefile     |    1 +
>>  drivers/usb/gadget/udc/tegra_xudc.c | 3808 +++++++++++++++++++++++++++++++++++
>>  3 files changed, 3820 insertions(+)
>>  create mode 100644 drivers/usb/gadget/udc/tegra_xudc.c
>>
>> diff --git a/drivers/usb/gadget/udc/Kconfig b/drivers/usb/gadget/udc/Kconfig
>> index ef0259a..fe6028e 100644
>> --- a/drivers/usb/gadget/udc/Kconfig
>> +++ b/drivers/usb/gadget/udc/Kconfig
>> @@ -440,6 +440,17 @@ config USB_GADGET_XILINX
>>  	  dynamically linked module called "udc-xilinx" and force all
>>  	  gadget drivers to also be dynamically linked.
>>  
>> +config USB_TEGRA_XUDC
>> +	tristate "NVIDIA Tegra Superspeed USB 3.0 Device Controller"
>> +	depends on ARCH_TEGRA
>> +	select USB_ROLE_SWITCH
>> +	help
>> +	 Enables NVIDIA Tegra USB 3.0 device mode controller driver.
>> +
>> +	 Say "y" to link the driver statically, or "m" to build a
>> +	 dynamically linked module called "tegra_xudc" and force all
>> +	 gadget drivers to also be dynamically linked.
>> +
>>  source "drivers/usb/gadget/udc/aspeed-vhub/Kconfig"
>>  
>>  #
>> diff --git a/drivers/usb/gadget/udc/Makefile b/drivers/usb/gadget/udc/Makefile
>> index 897f648..1c55c96 100644
>> --- a/drivers/usb/gadget/udc/Makefile
>> +++ b/drivers/usb/gadget/udc/Makefile
>> @@ -24,6 +24,7 @@ obj-$(CONFIG_USB_BCM63XX_UDC)	+= bcm63xx_udc.o
>>  obj-$(CONFIG_USB_FSL_USB2)	+= fsl_usb2_udc.o
>>  fsl_usb2_udc-y			:= fsl_udc_core.o
>>  fsl_usb2_udc-$(CONFIG_ARCH_MXC)	+= fsl_mxc_udc.o
>> +obj-$(CONFIG_USB_TEGRA_XUDC)	+= tegra_xudc.o
>>  obj-$(CONFIG_USB_M66592)	+= m66592-udc.o
>>  obj-$(CONFIG_USB_R8A66597)	+= r8a66597-udc.o
>>  obj-$(CONFIG_USB_RENESAS_USB3)	+= renesas_usb3.o
>> diff --git a/drivers/usb/gadget/udc/tegra_xudc.c b/drivers/usb/gadget/udc/tegra_xudc.c
>> new file mode 100644
>> index 0000000..26a889b
>> --- /dev/null
>> +++ b/drivers/usb/gadget/udc/tegra_xudc.c
>> @@ -0,0 +1,3808 @@
>> +// SPDX-License-Identifier: GPL-2.0+
>> +/*
>> + * NVIDIA Tegra XUSB device mode controller
>> + *
>> + * Copyright (c) 2013-2019, NVIDIA CORPORATION.  All rights reserved.
>> + * Copyright (c) 2015, Google Inc.
>> + */
>> +
>> +#include <linux/clk.h>
>> +#include <linux/completion.h>
>> +#include <linux/delay.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/dmapool.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/kernel.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +#include <linux/of_device.h>
>> +#include <linux/phy/phy.h>
>> +#include <linux/phy/tegra/xusb.h>
>> +#include <linux/pm_domain.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>> +#include <linux/regulator/consumer.h>
>> +#include <linux/reset.h>
>> +#include <linux/usb/ch9.h>
>> +#include <linux/usb/gadget.h>
>> +#include <linux/usb/role.h>
>> +#include <linux/workqueue.h>
>> +
>> +/* XUSB_DEV registers */
>> +#define SPARAM 0x000
>> +#define  SPARAM_ERSTMAX_SHIFT 16
>> +#define  SPARAM_ERSTMAX_MASK GENMASK(4, 0)
>> +#define DB 0x004
>> +#define  DB_TARGET_SHIFT 8
>> +#define  DB_TARGET_MASK GENMASK(7, 0)
>> +#define  DB_STREAMID_SHIFT 16
>> +#define  DB_STREAMID_MASK GENMASK(15, 0)
> To me, define it as :
> #define  DB_STREAMID_MASK GENMASK(31, 16),
> it's more clearer.
> and define another macro
> #define  DB_STREAMID(x) (((x) & 0xffff) << 16)
> this can avoid over flow sometimes, of cause it'll not happen for
> DB_STREAM, but may happen for BD_TARGET when use the way you write
> 
Will update MASK and SHIFT accordingly and add a new macro for
register update as per Felipe and your inputs.

>> +#define ERSTSZ 0x008
>> +#define  ERSTSZ_ERSTXSZ_SHIFT(x) ((x) * 16)
>> +#define  ERSTSZ_ERSTXSZ_MASK GENMASK(15, 0)
>> +#define ERSTXBALO(x) (0x010 + 8 * (x))
>> +#define ERSTXBAHI(x) (0x014 + 8 * (x))
>> +#define ERDPLO 0x020
>> +#define  ERDPLO_EHB BIT(3)
>> +#define ERDPHI 0x024
>> +#define EREPLO 0x028
>> +#define  EREPLO_ECS BIT(0)
>> +#define  EREPLO_SEGI BIT(1)
>> +#define EREPHI 0x02c
>> +#define CTRL 0x030
>> +#define  CTRL_RUN BIT(0)
>> +#define  CTRL_LSE BIT(1)
>> +#define  CTRL_IE BIT(4)
>> +#define  CTRL_SMI_EVT BIT(5)
>> +#define  CTRL_SMI_DSE BIT(6)
>> +#define  CTRL_EWE BIT(7)
>> +#define  CTRL_DEVADDR_SHIFT 24
>> +#define  CTRL_DEVADDR_MASK GENMASK(6, 0)
>> +#define  CTRL_ENABLE BIT(31)
>> +#define ST 0x034
>> +#define  ST_RC BIT(0)
>> +#define  ST_IP BIT(4)
>> +#define RT_IMOD	0x038
>> +#define  RT_IMOD_IMODI_SHIFT 0
>> +#define  RT_IMOD_IMODI_MASK GENMASK(15, 0)
>> +#define  RT_IMOD_IMODC_SHIFT 16
>> +#define  RT_IMOD_IMODC_MASK GENMASK(15, 0)
>> +#define PORTSC 0x03c
>> +#define  PORTSC_CCS BIT(0)
>> +#define  PORTSC_PED BIT(1)
>> +#define  PORTSC_PR BIT(4)
>> +#define  PORTSC_PLS_SHIFT 5
>> +#define  PORTSC_PLS_MASK GENMASK(3, 0)
>> +#define  PORTSC_PLS_U0 0x0
>> +#define  PORTSC_PLS_U2 0x2
>> +#define  PORTSC_PLS_U3 0x3
>> +#define  PORTSC_PLS_DISABLED 0x4
>> +#define  PORTSC_PLS_RXDETECT 0x5
>> +#define  PORTSC_PLS_INACTIVE 0x6
>> +#define  PORTSC_PLS_RESUME 0xf
>> +#define  PORTSC_PS_SHIFT 10
>> +#define  PORTSC_PS_MASK GENMASK(3, 0)
>> +#define  PORTSC_PS_UNDEFINED 0x0
>> +#define  PORTSC_PS_FS 0x1
>> +#define  PORTSC_PS_LS 0x2
>> +#define  PORTSC_PS_HS 0x3
>> +#define  PORTSC_PS_SS 0x4
>> +#define  PORTSC_LWS BIT(16)
>> +#define  PORTSC_CSC BIT(17)
>> +#define  PORTSC_WRC BIT(19)
>> +#define  PORTSC_PRC BIT(21)
>> +#define  PORTSC_PLC BIT(22)
>> +#define  PORTSC_CEC BIT(23)
>> +#define  PORTSC_WPR BIT(30)
>> +#define  PORTSC_CHANGE_MASK (PORTSC_CSC | PORTSC_WRC | PORTSC_PRC | \
>> +			     PORTSC_PLC | PORTSC_CEC)
>> +#define ECPLO 0x040
>> +#define ECPHI 0x044
>> +#define MFINDEX 0x048
>> +#define  MFINDEX_UFRAME_SHIFT 0
>> +#define  MFINDEX_UFRAME_MASK GENMASK(2, 0)
>> +#define  MFINDEX_FRAME_SHIFT 3
>> +#define  MFINDEX_FRAME_MASK GENMASK(10, 0)
>> +#define PORTPM 0x04c
>> +#define  PORTPM_L1S_SHIFT 0
>> +#define  PORTPM_L1S_MASK GENMASK(1, 0)
>> +#define  PORTPM_L1S_DROP 0x0
>> +#define  PORTPM_L1S_ACCEPT 0x1
>> +#define  PORTPM_L1S_NYET 0x2
>> +#define  PORTPM_L1S_STALL 0x3
>> +#define  PORTPM_RWE BIT(3)
>> +#define  PORTPM_U2TIMEOUT_SHIFT 8
>> +#define  PORTPM_U2TIMEOUT_MASK GENMASK(7, 0)
>> +#define  PORTPM_U1TIMEOUT_SHIFT 16
>> +#define  PORTPM_U1TIMEOUT_MASK GENMASK(7, 0)
>> +#define  PORTPM_FLA BIT(24)
>> +#define  PORTPM_VBA BIT(25)
>> +#define  PORTPM_WOC BIT(26)
>> +#define  PORTPM_WOD BIT(27)
>> +#define  PORTPM_U1E BIT(28)
>> +#define  PORTPM_U2E BIT(29)
>> +#define  PORTPM_FRWE BIT(30)
>> +#define  PORTPM_PNG_CYA BIT(31)
>> +#define EP_HALT 0x050
>> +#define EP_PAUSE 0x054
>> +#define EP_RELOAD 0x058
>> +#define EP_STCHG 0x05c
>> +#define DEVNOTIF_LO 0x064
>> +#define  DEVNOTIF_LO_TRIG BIT(0)
>> +#define  DEVNOTIF_LO_TYPE_SHIFT 4
>> +#define  DEVNOTIF_LO_TYPE_MASK GENMASK(3, 0)
>> +#define  DEVNOTIF_LO_TYPE_FUNCTION_WAKE 0x1
>> +#define DEVNOTIF_HI 0x068
>> +#define PORTHALT 0x06c
>> +#define  PORTHALT_HALT_LTSSM BIT(0)
>> +#define  PORTHALT_HALT_REJECT BIT(1)
>> +#define  PORTHALT_STCHG_REQ BIT(20)
>> +#define  PORTHALT_STCHG_INTR_EN BIT(24)
>> +#define PORT_TM	0x070
>> +#define EP_THREAD_ACTIVE 0x074
>> +#define EP_STOPPED 0x078
>> +#define HSFSPI_COUNT0 0x100
>> +#define HSFSPI_COUNT13 0x134
>> +#define  HSFSPI_COUNT13_U2_RESUME_K_DURATION_SHIFT 0
>> +#define  HSFSPI_COUNT13_U2_RESUME_K_DURATION_MASK GENMASK(29, 0)
>> +#define BLCG 0x840
>> +#define SSPX_CORE_CNT0 0x610
>> +#define  SSPX_CORE_CNT0_PING_TBURST_SHIFT 0
>> +#define  SSPX_CORE_CNT0_PING_TBURST_MASK GENMASK(7, 0)
>> +#define SSPX_CORE_CNT30 0x688
>> +#define  SSPX_CORE_CNT30_LMPITP_TIMER_SHIFT 0
>> +#define  SSPX_CORE_CNT30_LMPITP_TIMER_MASK GENMASK(19, 0)
>> +#define SSPX_CORE_CNT32 0x690
>> +#define  SSPX_CORE_CNT32_POLL_TBURST_MAX_SHIFT 0
>> +#define  SSPX_CORE_CNT32_POLL_TBURST_MAX_MASK GENMASK(7, 0)
>> +#define SSPX_CORE_PADCTL4 0x750
>> +#define  SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_SHIFT 0
>> +#define  SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_MASK GENMASK(19, 0)
>> +#define  BLCG_DFPCI BIT(0)
>> +#define  BLCG_UFPCI BIT(1)
>> +#define  BLCG_FE BIT(2)
>> +#define  BLCG_COREPLL_PWRDN BIT(8)
>> +#define  BLCG_IOPLL_0_PWRDN BIT(9)
>> +#define  BLCG_IOPLL_1_PWRDN BIT(10)
>> +#define  BLCG_IOPLL_2_PWRDN BIT(11)
>> +#define  BLCG_ALL 0x1ff
>> +#define CFG_DEV_SSPI_XFER 0x858
>> +#define  CFG_DEV_SSPI_XFER_ACKTIMEOUT_SHIFT 0
>> +#define  CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK GENMASK(31, 0)
>> +#define CFG_DEV_FE 0x85c
>> +#define  CFG_DEV_FE_PORTREGSEL_SHIFT 0
>> +#define  CFG_DEV_FE_PORTREGSEL_MASK GENMASK(1, 0)
>> +#define  CFG_DEV_FE_PORTREGSEL_SS_PI 1
>> +#define  CFG_DEV_FE_PORTREGSEL_HSFS_PI 2
>> +#define  CFG_DEV_FE_INFINITE_SS_RETRY BIT(29)
>> +
>> +/* FPCI registers */
>> +#define XUSB_DEV_CFG_1 0x004
>> +#define  XUSB_DEV_CFG_1_IO_SPACE_EN BIT(0)
>> +#define  XUSB_DEV_CFG_1_MEMORY_SPACE_EN BIT(1)
>> +#define  XUSB_DEV_CFG_1_BUS_MASTER_EN BIT(2)
>> +#define XUSB_DEV_CFG_4 0x010
>> +#define  XUSB_DEV_CFG_4_BASE_ADDR_SHIFT 15
>> +#define  XUSB_DEV_CFG_4_BASE_ADDR_MASK GENMASK(16, 0)
>> +#define XUSB_DEV_CFG_5 0x014
>> +
>> +/* IPFS registers */
>> +#define XUSB_DEV_CONFIGURATION_0 0x180
>> +#define  XUSB_DEV_CONFIGURATION_0_EN_FPCI BIT(0)
>> +#define XUSB_DEV_INTR_MASK_0 0x188
>> +#define  XUSB_DEV_INTR_MASK_0_IP_INT_MASK BIT(16)
>> +
>> +struct tegra_xudc_ep_context {
>> +	__le32 info0;
>> +	__le32 info1;
>> +	__le32 deq_lo;
>> +	__le32 deq_hi;
>> +	__le32 tx_info;
>> +	__le32 rsvd[11];
>> +};
>> +
>> +#define EP_STATE_DISABLED 0
>> +#define EP_STATE_RUNNING 1
>> +#define EP_STATE_HALTED 2
>> +#define EP_STATE_STOPPED 3
>> +#define EP_STATE_ERROR 4
>> +
>> +#define EP_TYPE_INVALID 0
>> +#define EP_TYPE_ISOCH_OUT 1
>> +#define EP_TYPE_BULK_OUT 2
>> +#define EP_TYPE_INTERRUPT_OUT 3
>> +#define EP_TYPE_CONTROL 4
>> +#define EP_TYPE_ISCOH_IN 5
>> +#define EP_TYPE_BULK_IN 6
>> +#define EP_TYPE_INTERRUPT_IN 7
>> +
>> +#define BUILD_EP_CONTEXT_RW(name, member, shift, mask)			\
>> +static inline u32 ep_ctx_read_##name(struct tegra_xudc_ep_context *ctx)	\
>> +{									\
>> +	return (le32_to_cpu(ctx->member) >> shift) & mask;		\
>> +}									\
>> +static inline void							\
>> +ep_ctx_write_##name(struct tegra_xudc_ep_context *ctx, u32 val)		\
>> +{									\
>> +	u32 tmp;							\
>> +									\
>> +	tmp = le32_to_cpu(ctx->member) & ~(mask << shift);		\
>> +	tmp |= (val & mask) << shift;					\
>> +	ctx->member = cpu_to_le32(tmp);					\
>> +}
> add () for shift and mask ?
> and there may be side effect for shift and mask, you use many times in
> one macro
>
Sure will bound mask and shift inside ()
w.r.t frequent usage of shift and mask, for this purpose they are assigned as
constants in the caller.
 
>> +
>> +BUILD_EP_CONTEXT_RW(state, info0, 0, 0x7)
>> +BUILD_EP_CONTEXT_RW(mult, info0, 8, 0x3)
>> +BUILD_EP_CONTEXT_RW(max_pstreams, info0, 10, 0x1f)
>> +BUILD_EP_CONTEXT_RW(lsa, info0, 15, 0x1)
>> +BUILD_EP_CONTEXT_RW(interval, info0, 16, 0xff)
>> +BUILD_EP_CONTEXT_RW(cerr, info1, 1, 0x3)
>> +BUILD_EP_CONTEXT_RW(type, info1, 3, 0x7)
>> +BUILD_EP_CONTEXT_RW(hid, info1, 7, 0x1)
>> +BUILD_EP_CONTEXT_RW(max_burst_size, info1, 8, 0xff)
>> +BUILD_EP_CONTEXT_RW(max_packet_size, info1, 16, 0xffff)
>> +BUILD_EP_CONTEXT_RW(dcs, deq_lo, 0, 0x1)
>> +BUILD_EP_CONTEXT_RW(deq_lo, deq_lo, 4, 0xfffffff)
>> +BUILD_EP_CONTEXT_RW(deq_hi, deq_hi, 0, 0xffffffff)
>> +BUILD_EP_CONTEXT_RW(avg_trb_len, tx_info, 0, 0xffff)
>> +BUILD_EP_CONTEXT_RW(max_esit_payload, tx_info, 16, 0xffff)
>> +BUILD_EP_CONTEXT_RW(edtla, rsvd[0], 0, 0xffffff)
>> +BUILD_EP_CONTEXT_RW(seq_num, rsvd[0], 24, 0xff)
>> +BUILD_EP_CONTEXT_RW(partial_td, rsvd[0], 25, 0x1)
>> +BUILD_EP_CONTEXT_RW(cerrcnt, rsvd[1], 18, 0x3)
>> +BUILD_EP_CONTEXT_RW(data_offset, rsvd[2], 0, 0x1ffff)
>> +BUILD_EP_CONTEXT_RW(numtrbs, rsvd[2], 22, 0x1f)
>> +BUILD_EP_CONTEXT_RW(devaddr, rsvd[6], 0, 0x7f)
>> +
>> +static inline u64 ep_ctx_read_deq_ptr(struct tegra_xudc_ep_context *ctx)
>> +{
>> +	return ((u64)ep_ctx_read_deq_hi(ctx) << 32) |
>> +		(ep_ctx_read_deq_lo(ctx) << 4);
>> +}
>> +
>> +static inline void
>> +ep_ctx_write_deq_ptr(struct tegra_xudc_ep_context *ctx, u64 addr)
>> +{
>> +	ep_ctx_write_deq_lo(ctx, lower_32_bits(addr) >> 4);
>> +	ep_ctx_write_deq_hi(ctx, upper_32_bits(addr));
>> +}
>> +
>> +struct tegra_xudc_trb {
>> +	__le32 data_lo;
>> +	__le32 data_hi;
>> +	__le32 status;
>> +	__le32 control;
>> +};
>> +
>> +#define TRB_TYPE_RSVD 0
>> +#define TRB_TYPE_NORMAL 1
>> +#define TRB_TYPE_SETUP_STAGE 2
>> +#define TRB_TYPE_DATA_STAGE 3
>> +#define TRB_TYPE_STATUS_STAGE 4
>> +#define TRB_TYPE_ISOCH 5
>> +#define TRB_TYPE_LINK 6
>> +#define TRB_TYPE_TRANSFER_EVENT 32
>> +#define TRB_TYPE_PORT_STATUS_CHANGE_EVENT 34
>> +#define TRB_TYPE_STREAM 48
>> +#define TRB_TYPE_SETUP_PACKET_EVENT 63
>> +
>> +#define TRB_CMPL_CODE_INVALID 0
>> +#define TRB_CMPL_CODE_SUCCESS 1
>> +#define TRB_CMPL_CODE_DATA_BUFFER_ERR 2
>> +#define TRB_CMPL_CODE_BABBLE_DETECTED_ERR 3
>> +#define TRB_CMPL_CODE_USB_TRANS_ERR 4
>> +#define TRB_CMPL_CODE_TRB_ERR 5
>> +#define TRB_CMPL_CODE_STALL 6
>> +#define TRB_CMPL_CODE_INVALID_STREAM_TYPE_ERR 10
>> +#define TRB_CMPL_CODE_SHORT_PACKET 13
>> +#define TRB_CMPL_CODE_RING_UNDERRUN 14
>> +#define TRB_CMPL_CODE_RING_OVERRUN 15
>> +#define TRB_CMPL_CODE_EVENT_RING_FULL_ERR 21
>> +#define TRB_CMPL_CODE_STOPPED 26
>> +#define TRB_CMPL_CODE_ISOCH_BUFFER_OVERRUN 31
>> +#define TRB_CMPL_CODE_STREAM_NUMP_ERROR 219
>> +#define TRB_CMPL_CODE_PRIME_PIPE_RECEIVED 220
>> +#define TRB_CMPL_CODE_HOST_REJECTED 221
>> +#define TRB_CMPL_CODE_CTRL_DIR_ERR 222
>> +#define TRB_CMPL_CODE_CTRL_SEQNUM_ERR 223
>> +
>> +#define BUILD_TRB_RW(name, member, shift, mask)				\
>> +static inline u32 trb_read_##name(struct tegra_xudc_trb *trb)		\
>> +{									\
>> +	return (le32_to_cpu(trb->member) >> shift) & mask;		\
>> +}									\
>> +static inline void							\
>> +trb_write_##name(struct tegra_xudc_trb *trb, u32 val)			\
>> +{									\
>> +	u32 tmp;							\
>> +									\
>> +	tmp = le32_to_cpu(trb->member) & ~(mask << shift);		\
>> +	tmp |= (val & mask) << shift;					\
>> +	trb->member = cpu_to_le32(tmp);					\
>> +}
> ditto
Will update accordingly.

>> +
>> +BUILD_TRB_RW(data_lo, data_lo, 0, 0xffffffff)
>> +BUILD_TRB_RW(data_hi, data_hi, 0, 0xffffffff)
>> +BUILD_TRB_RW(seq_num, status, 0, 0xffff)
>> +BUILD_TRB_RW(transfer_len, status, 0, 0xffffff)
>> +BUILD_TRB_RW(td_size, status, 17, 0x1f)
>> +BUILD_TRB_RW(cmpl_code, status, 24, 0xff)
>> +BUILD_TRB_RW(cycle, control, 0, 0x1)
>> +BUILD_TRB_RW(toggle_cycle, control, 1, 0x1)
>> +BUILD_TRB_RW(isp, control, 2, 0x1)
>> +BUILD_TRB_RW(chain, control, 4, 0x1)
>> +BUILD_TRB_RW(ioc, control, 5, 0x1)
>> +BUILD_TRB_RW(type, control, 10, 0x3f)
>> +BUILD_TRB_RW(stream_id, control, 16, 0xffff)
>> +BUILD_TRB_RW(endpoint_id, control, 16, 0x1f)
>> +BUILD_TRB_RW(tlbpc, control, 16, 0xf)
>> +BUILD_TRB_RW(data_stage_dir, control, 16, 0x1)
>> +BUILD_TRB_RW(frame_id, control, 20, 0x7ff)
>> +BUILD_TRB_RW(sia, control, 31, 0x1)
>> +
>> +static inline u64 trb_read_data_ptr(struct tegra_xudc_trb *trb)
>> +{
>> +	return ((u64)trb_read_data_hi(trb) << 32) |
>> +		trb_read_data_lo(trb);
>> +}
>> +
>> +static inline void trb_write_data_ptr(struct tegra_xudc_trb *trb, u64 addr)
>> +{
>> +	trb_write_data_lo(trb, lower_32_bits(addr));
>> +	trb_write_data_hi(trb, upper_32_bits(addr));
>> +}
>> +
>> +struct tegra_xudc_request {
>> +	struct usb_request usb_req;
>> +
>> +	size_t buf_queued;
>> +	unsigned int trbs_queued;
>> +	unsigned int trbs_needed;
>> +	bool need_zlp;
>> +
>> +	struct tegra_xudc_trb *first_trb;
>> +	struct tegra_xudc_trb *last_trb;
>> +
>> +	struct list_head list;
>> +};
>> +
>> +struct tegra_xudc_ep {
>> +	struct tegra_xudc *xudc;
>> +	struct usb_ep usb_ep;
>> +	unsigned int index;
>> +	char name[8];
>> +
>> +	struct tegra_xudc_ep_context *context;
>> +
>> +#define XUDC_TRANSFER_RING_SIZE 64
>> +	struct tegra_xudc_trb *transfer_ring;
>> +	dma_addr_t transfer_ring_phys;
>> +
>> +	unsigned int enq_ptr;
>> +	unsigned int deq_ptr;
>> +	bool pcs;
>> +	bool ring_full;
>> +	bool stream_rejected;
>> +
>> +	struct list_head queue;
>> +	const struct usb_endpoint_descriptor *desc;
>> +	const struct usb_ss_ep_comp_descriptor *comp_desc;
>> +};
>> +
>> +struct tegra_xudc_sel_timing {
>> +	__u8 u1sel;
>> +	__u8 u1pel;
>> +	__le16 u2sel;
>> +	__le16 u2pel;
>> +};
>> +
>> +enum tegra_xudc_setup_state {
>> +	WAIT_FOR_SETUP,
>> +	DATA_STAGE_XFER,
>> +	DATA_STAGE_RECV,
>> +	STATUS_STAGE_XFER,
>> +	STATUS_STAGE_RECV,
>> +};
>> +
>> +struct tegra_xudc_setup_packet {
>> +	struct usb_ctrlrequest ctrl_req;
>> +	unsigned int seq_num;
>> +};
>> +
>> +struct tegra_xudc_save_regs {
>> +	u32 ctrl;
>> +	u32 portpm;
>> +};
>> +
>> +struct tegra_xudc {
>> +	struct device *dev;
>> +	const struct tegra_xudc_soc *soc;
>> +	struct tegra_xusb_padctl *padctl;
>> +
>> +	spinlock_t lock;
>> +
>> +	struct usb_gadget gadget;
>> +	struct usb_gadget_driver *driver;
>> +
>> +#define XUDC_NR_EVENT_RINGS 2
>> +#define XUDC_EVENT_RING_SIZE 4096
>> +	struct tegra_xudc_trb *event_ring[XUDC_NR_EVENT_RINGS];
>> +	dma_addr_t event_ring_phys[XUDC_NR_EVENT_RINGS];
>> +	unsigned int event_ring_index;
>> +	unsigned int event_ring_deq_ptr;
>> +	bool ccs;
>> +
>> +#define XUDC_NR_EPS 32
>> +	struct tegra_xudc_ep ep[XUDC_NR_EPS];
>> +	struct tegra_xudc_ep_context *ep_context;
>> +	dma_addr_t ep_context_phys;
>> +
>> +	struct device *genpd_dev_device;
>> +	struct device *genpd_dev_ss;
>> +	struct device_link *genpd_dl_device;
>> +	struct device_link *genpd_dl_ss;
>> +
>> +	struct dma_pool *transfer_ring_pool;
>> +
>> +	bool queued_setup_packet;
>> +	struct tegra_xudc_setup_packet setup_packet;
>> +	enum tegra_xudc_setup_state setup_state;
>> +	u16 setup_seq_num;
>> +
>> +	u16 dev_addr;
>> +	u16 isoch_delay;
>> +	struct tegra_xudc_sel_timing sel_timing;
>> +	u8 test_mode_pattern;
>> +	u16 status_buf;
>> +	struct tegra_xudc_request *ep0_req;
>> +
>> +	bool pullup;
>> +
>> +	unsigned int nr_enabled_eps;
>> +	unsigned int nr_isoch_eps;
>> +
>> +	unsigned int device_state;
>> +	unsigned int resume_state;
>> +
>> +	int irq;
>> +
>> +	void __iomem *base;
>> +	resource_size_t phys_base;
>> +	void __iomem *ipfs;
>> +	void __iomem *fpci;
>> +
>> +	struct regulator_bulk_data *supplies;
>> +
>> +	struct clk_bulk_data *clks;
>> +
>> +	enum usb_role device_mode;
>> +	struct usb_role_switch *usb_role_sw;
>> +	struct work_struct usb_role_sw_work;
>> +
>> +	struct phy *usb3_phy;
>> +	struct phy *utmi_phy;
>> +
>> +	struct tegra_xudc_save_regs saved_regs;
>> +	bool suspended;
>> +	bool powergated;
>> +
>> +	struct completion disconnect_complete;
>> +
>> +	bool selfpowered;
>> +
>> +#define TOGGLE_VBUS_WAIT_MS 100
>> +	struct delayed_work plc_reset_work;
>> +	bool wait_csc;
>> +
>> +	struct delayed_work port_reset_war_work;
>> +	bool wait_for_sec_prc;
>> +};
>> +
>> +#define XUDC_TRB_MAX_BUFFER_SIZE 65536
>> +#define XUDC_MAX_ISOCH_EPS 4
>> +#define XUDC_INTERRUPT_MODERATION_US 0
>> +
>> +static struct usb_endpoint_descriptor tegra_xudc_ep0_desc = {
>> +	.bLength = USB_DT_ENDPOINT_SIZE,
>> +	.bDescriptorType = USB_DT_ENDPOINT,
>> +	.bEndpointAddress = 0,
>> +	.bmAttributes = USB_ENDPOINT_XFER_CONTROL,
>> +	.wMaxPacketSize = cpu_to_le16(64),
>> +};
>> +
>> +struct tegra_xudc_soc {
>> +	const char * const *supply_names;
>> +	unsigned int num_supplies;
>> +	const char * const *clock_names;
>> +	unsigned int num_clks;
>> +	bool u1_enable;
>> +	bool u2_enable;
>> +	bool lpm_enable;
>> +	bool invalid_seq_num;
>> +	bool pls_quirk;
>> +	bool port_reset_quirk;
>> +	bool has_ipfs;
>> +};
>> +
>> +static inline u32 fpci_readl(struct tegra_xudc *xudc, unsigned int offset)
>> +{
>> +	return readl(xudc->fpci + offset);
>> +}
>> +
>> +static inline void fpci_writel(struct tegra_xudc *xudc, u32 val,
>> +			       unsigned int offset)
>> +{
>> +	writel(val, xudc->fpci + offset);
>> +}
>> +
>> +static inline u32 ipfs_readl(struct tegra_xudc *xudc, unsigned int offset)
>> +{
>> +	return readl(xudc->ipfs + offset);
>> +}
>> +
>> +static inline void ipfs_writel(struct tegra_xudc *xudc, u32 val,
>> +			       unsigned int offset)
>> +{
>> +	writel(val, xudc->ipfs + offset);
>> +}
>> +
>> +static inline u32 xudc_readl(struct tegra_xudc *xudc, unsigned int offset)
>> +{
>> +	return readl(xudc->base + offset);
>> +}
>> +
>> +static inline void xudc_writel(struct tegra_xudc *xudc, u32 val,
>> +			       unsigned int offset)
>> +{
>> +	writel(val, xudc->base + offset);
>> +}
>> +
>> +static inline int xudc_readl_poll(struct tegra_xudc *xudc,
>> +				  unsigned int offset, u32 mask, u32 val)
>> +{
>> +	u32 regval;
>> +
>> +	return readl_poll_timeout_atomic(xudc->base + offset, regval,
>> +					 (regval & mask) == val, 1, 100);
>> +}
>> +
>> +static inline struct tegra_xudc *to_xudc(struct usb_gadget *gadget)
>> +{
>> +	return container_of(gadget, struct tegra_xudc, gadget);
>> +}
>> +
>> +static inline struct tegra_xudc_ep *to_xudc_ep(struct usb_ep *ep)
>> +{
>> +	return container_of(ep, struct tegra_xudc_ep, usb_ep);
>> +}
>> +
>> +static inline struct tegra_xudc_request *to_xudc_req(struct usb_request *req)
>> +{
>> +	return container_of(req, struct tegra_xudc_request, usb_req);
>> +}
>> +
>> +static inline void dump_trb(struct tegra_xudc *xudc, const char *type,
>> +			    struct tegra_xudc_trb *trb)
>> +{
>> +	dev_dbg(xudc->dev,
>> +		"%s: %p, lo = %#x, hi = %#x, status = %#x, control = %#x\n",
>> +		type, trb, trb->data_lo, trb->data_hi, trb->status,
>> +		trb->control);
>> +}
>> +
>> +static void tegra_xudc_device_mode_on(struct tegra_xudc *xudc)
>> +{
>> +	int err;
>> +
>> +	pm_runtime_get_sync(xudc->dev);
>> +
>> +	err = phy_power_on(xudc->utmi_phy);
>> +	if (err < 0)
>> +		dev_err(xudc->dev, "utmi power on failed %d\n", err);
>> +
>> +	err = phy_power_on(xudc->usb3_phy);
>> +	if (err < 0)
>> +		dev_err(xudc->dev, "usb3 phy power on failed %d\n", err);
>> +
>> +	dev_dbg(xudc->dev, "device mode on\n");
>> +
>> +	tegra_xusb_padctl_set_vbus_override(xudc->padctl, true);
>> +
>> +	xudc->device_mode = true;
>> +}
>> +
>> +static void tegra_xudc_device_mode_off(struct tegra_xudc *xudc)
>> +{
>> +	bool connected = false;
>> +	u32 pls, val;
>> +	int err;
>> +
>> +	dev_dbg(xudc->dev, "device mode off\n");
>> +
>> +	connected = !!(xudc_readl(xudc, PORTSC) & PORTSC_CCS);
>> +
>> +	reinit_completion(&xudc->disconnect_complete);
>> +
>> +	tegra_xusb_padctl_set_vbus_override(xudc->padctl, false);
>> +
>> +	pls = (xudc_readl(xudc, PORTSC) >> PORTSC_PLS_SHIFT) &
>> +		PORTSC_PLS_MASK;
>> +
>> +	/* Direct link to U0 if disconnected in RESUME or U2. */
>> +	if (xudc->soc->pls_quirk && xudc->gadget.speed == USB_SPEED_SUPER &&
>> +	    (pls == PORTSC_PLS_RESUME || pls == PORTSC_PLS_U2)) {
>> +		val = xudc_readl(xudc, PORTPM);
>> +		val |= PORTPM_FRWE;
>> +		xudc_writel(xudc, val, PORTPM);
>> +
>> +		val = xudc_readl(xudc, PORTSC);
>> +		val &= ~(PORTSC_CHANGE_MASK |
>> +			 (PORTSC_PLS_MASK << PORTSC_PLS_SHIFT));
>> +		val |= PORTSC_LWS | (PORTSC_PLS_U0 << PORTSC_PLS_SHIFT);
>> +		xudc_writel(xudc, val, PORTSC);
>> +	}
>> +
>> +	xudc->device_mode = false;
>> +
>> +	/* Wait for disconnect event. */
>> +	if (connected)
>> +		wait_for_completion(&xudc->disconnect_complete);
>> +
>> +	/* Make sure interrupt handler has completed before powergating. */
>> +	synchronize_irq(xudc->irq);
>> +
>> +	err = phy_power_off(xudc->utmi_phy);
>> +	if (err < 0)
>> +		dev_err(xudc->dev, "utmi_phy power off failed %d\n", err);
>> +
>> +	err = phy_power_off(xudc->usb3_phy);
>> +	if (err < 0)
>> +		dev_err(xudc->dev, "usb3_phy power off failed %d\n", err);
>> +
>> +	pm_runtime_put(xudc->dev);
>> +}
>> +
>> +static void tegra_xudc_update_data_role(struct tegra_xudc *xudc)
>> +{
>> +	if (xudc->device_mode == USB_ROLE_DEVICE)
>> +		tegra_xudc_device_mode_on(xudc);
>> +	else
>> +		tegra_xudc_device_mode_off(xudc);
>> +}
>> +
>> +static void tegra_xudc_usb_role_sw_work(struct work_struct *work)
>> +{
>> +	struct tegra_xudc *xudc = container_of(work, struct tegra_xudc,
>> +					       usb_role_sw_work);
>> +
>> +	tegra_xudc_update_data_role(xudc);
>> +}
>> +
>> +static int tegra_xudc_usb_role_sw_set(struct device *dev, enum usb_role role)
>> +{
>> +	struct tegra_xudc *xudc = dev_get_drvdata(dev);
>> +	unsigned long flags;
>> +
>> +	dev_dbg(dev, "%s role is %d\n", __func__, role);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	xudc->device_mode = role;
>> +
>> +	if (!xudc->suspended)
>> +		schedule_work(&xudc->usb_role_sw_work);
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return 0;
>> +}
>> +
>> +static void tegra_xudc_plc_reset_work(struct work_struct *work)
>> +{
>> +	struct delayed_work *dwork = to_delayed_work(work);
>> +	struct tegra_xudc *xudc = container_of(dwork, struct tegra_xudc,
>> +					       plc_reset_work);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (xudc->wait_csc) {
>> +		u32 pls = (xudc_readl(xudc, PORTSC) >> PORTSC_PLS_SHIFT) &
>> +			  PORTSC_PLS_MASK;
>> +
>> +		if (pls == PORTSC_PLS_INACTIVE) {
>> +			dev_info(xudc->dev, "PLS = Inactive. Toggle VBUS\n");
>> +			tegra_xusb_padctl_set_vbus_override(xudc->padctl,
>> +							      false);
>> +			tegra_xusb_padctl_set_vbus_override(xudc->padctl, true);
>> +			xudc->wait_csc = false;
>> +		}
>> +	}
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +}
>> +
>> +static void tegra_xudc_port_reset_war_work(struct work_struct *work)
>> +{
>> +	struct delayed_work *dwork = to_delayed_work(work);
>> +	struct tegra_xudc *xudc =
>> +		container_of(dwork, struct tegra_xudc, port_reset_war_work);
>> +	unsigned long flags;
>> +	u32 pls;
>> +	int ret;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (xudc->usb_role_sw && (xudc->device_mode == USB_ROLE_DEVICE)
>> +			      && xudc->wait_for_sec_prc) {
>> +		pls = (xudc_readl(xudc, PORTSC) >> PORTSC_PLS_SHIFT) &
>> +			PORTSC_PLS_MASK;
>> +		dev_dbg(xudc->dev, "pls = %x\n", pls);
>> +
>> +		if (pls == PORTSC_PLS_DISABLED) {
>> +			dev_dbg(xudc->dev, "toggle vbus\n");
>> +			/* PRC doesn't complete in 100ms, toggle the vbus */
>> +			ret = tegra_phy_xusb_utmi_port_reset(xudc->utmi_phy);
>> +
>> +			if (ret == 1)
>> +				xudc->wait_for_sec_prc = 0;
>> +		}
>> +	}
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +}
>> +
>> +static dma_addr_t trb_virt_to_phys(struct tegra_xudc_ep *ep,
>> +				   struct tegra_xudc_trb *trb)
>> +{
>> +	unsigned int index;
>> +	dma_addr_t phys;
>> +
>> +	index = trb - ep->transfer_ring;
>> +
>> +	if (WARN_ON(index >= XUDC_TRANSFER_RING_SIZE))
>> +		return 0;
>> +
>> +	phys = ep->transfer_ring_phys + index * sizeof(*trb);
>> +
>> +	return phys;
>> +}
>> +
>> +static struct tegra_xudc_trb *trb_phys_to_virt(struct tegra_xudc_ep *ep,
>> +					       dma_addr_t addr)
>> +{
>> +	struct tegra_xudc_trb *trb;
>> +	unsigned int index;
>> +
>> +	index = (addr - ep->transfer_ring_phys) / sizeof(*trb);
>> +
>> +	if (WARN_ON(index >= XUDC_TRANSFER_RING_SIZE))
>> +		return NULL;
>> +
>> +	trb = &ep->transfer_ring[index];
>> +
>> +	return trb;
>> +}
>> +
>> +static void ep_reload(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	xudc_writel(xudc, BIT(ep), EP_RELOAD);
>> +	xudc_readl_poll(xudc, EP_RELOAD, BIT(ep), 0);
>> +}
>> +
>> +static void ep_pause(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_PAUSE);
>> +	if (val & BIT(ep))
>> +		return;
>> +	val |= BIT(ep);
>> +
>> +	xudc_writel(xudc, val, EP_PAUSE);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
>> +
>> +	xudc_writel(xudc, BIT(ep), EP_STCHG);
>> +}
>> +
>> +static void ep_unpause(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_PAUSE);
>> +	if (!(val & BIT(ep)))
>> +		return;
>> +	val &= ~BIT(ep);
>> +
>> +	xudc_writel(xudc, val, EP_PAUSE);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
>> +
>> +	xudc_writel(xudc, BIT(ep), EP_STCHG);
>> +}
>> +
>> +static void ep_unpause_all(struct tegra_xudc *xudc)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_PAUSE);
>> +
>> +	xudc_writel(xudc, 0, EP_PAUSE);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, val, val);
>> +
>> +	xudc_writel(xudc, val, EP_STCHG);
>> +}
>> +
>> +static void ep_halt(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_HALT);
>> +	if (val & BIT(ep))
>> +		return;
>> +	val |= BIT(ep);
>> +	xudc_writel(xudc, val, EP_HALT);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
>> +
>> +	xudc_writel(xudc, BIT(ep), EP_STCHG);
>> +}
>> +
>> +static void ep_unhalt(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_HALT);
>> +	if (!(val & BIT(ep)))
>> +		return;
>> +	val &= ~BIT(ep);
>> +	xudc_writel(xudc, val, EP_HALT);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, BIT(ep), BIT(ep));
>> +
>> +	xudc_writel(xudc, BIT(ep), EP_STCHG);
>> +}
>> +
>> +static void ep_unhalt_all(struct tegra_xudc *xudc)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, EP_HALT);
>> +	if (!val)
>> +		return;
>> +	xudc_writel(xudc, 0, EP_HALT);
>> +
>> +	xudc_readl_poll(xudc, EP_STCHG, val, val);
>> +
>> +	xudc_writel(xudc, val, EP_STCHG);
>> +}
>> +
>> +static void ep_wait_for_stopped(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	xudc_readl_poll(xudc, EP_STOPPED, BIT(ep), BIT(ep));
>> +	xudc_writel(xudc, BIT(ep), EP_STOPPED);
>> +}
>> +
>> +static void ep_wait_for_inactive(struct tegra_xudc *xudc, unsigned int ep)
>> +{
>> +	xudc_readl_poll(xudc, EP_THREAD_ACTIVE, BIT(ep), 0);
>> +}
>> +
>> +static void tegra_xudc_req_done(struct tegra_xudc_ep *ep,
>> +				struct tegra_xudc_request *req, int status)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +
>> +	dev_dbg(xudc->dev, "completing request %p on EP %u with status %d\n",
>> +		 req, ep->index, status);
>> +
>> +	if (likely(req->usb_req.status == -EINPROGRESS))
>> +		req->usb_req.status = status;
>> +
>> +	list_del_init(&req->list);
>> +
>> +	if (usb_endpoint_xfer_control(ep->desc)) {
>> +		usb_gadget_unmap_request(&xudc->gadget, &req->usb_req,
>> +					 (xudc->setup_state ==
>> +					  DATA_STAGE_XFER));
>> +	} else {
>> +		usb_gadget_unmap_request(&xudc->gadget, &req->usb_req,
>> +					 usb_endpoint_dir_in(ep->desc));
>> +	}
>> +
>> +	spin_unlock(&xudc->lock);
>> +	usb_gadget_giveback_request(&ep->usb_ep, &req->usb_req);
>> +	spin_lock(&xudc->lock);
>> +}
>> +
>> +static void tegra_xudc_ep_nuke(struct tegra_xudc_ep *ep, int status)
>> +{
>> +	struct tegra_xudc_request *req;
>> +
>> +	while (!list_empty(&ep->queue)) {
>> +		req = list_first_entry(&ep->queue, struct tegra_xudc_request,
>> +				       list);
>> +		tegra_xudc_req_done(ep, req, status);
>> +	}
>> +}
>> +
>> +static unsigned int ep_available_trbs(struct tegra_xudc_ep *ep)
>> +{
>> +	if (ep->ring_full)
>> +		return 0;
>> +
>> +	if (ep->deq_ptr > ep->enq_ptr)
>> +		return ep->deq_ptr - ep->enq_ptr - 1;
>> +
>> +	return XUDC_TRANSFER_RING_SIZE - (ep->enq_ptr - ep->deq_ptr) - 2;
>> +}
>> +
>> +static void tegra_xudc_queue_one_trb(struct tegra_xudc_ep *ep,
>> +				     struct tegra_xudc_request *req,
>> +				     struct tegra_xudc_trb *trb,
>> +				     bool ioc)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	dma_addr_t buf_addr;
>> +	size_t len;
>> +
>> +	len = min_t(size_t, XUDC_TRB_MAX_BUFFER_SIZE, req->usb_req.length -
>> +		    req->buf_queued);
>> +	if (len > 0)
>> +		buf_addr = req->usb_req.dma + req->buf_queued;
>> +	else
>> +		buf_addr = 0;
>> +
>> +	trb_write_data_ptr(trb, buf_addr);
>> +
>> +	trb_write_transfer_len(trb, len);
>> +	trb_write_td_size(trb, req->trbs_needed - req->trbs_queued - 1);
>> +
>> +	if (req->trbs_queued == req->trbs_needed - 1 ||
>> +		(req->need_zlp && req->trbs_queued == req->trbs_needed - 2))
>> +		trb_write_chain(trb, 0);
>> +	else
>> +		trb_write_chain(trb, 1);
>> +
>> +	trb_write_ioc(trb, ioc);
>> +
>> +	if (usb_endpoint_dir_out(ep->desc) ||
>> +	    (usb_endpoint_xfer_control(ep->desc) &&
>> +	     (xudc->setup_state == DATA_STAGE_RECV)))
>> +		trb_write_isp(trb, 1);
>> +	else
>> +		trb_write_isp(trb, 0);
>> +
>> +	if (usb_endpoint_xfer_control(ep->desc)) {
>> +		if (xudc->setup_state == DATA_STAGE_XFER ||
>> +		    xudc->setup_state == DATA_STAGE_RECV)
>> +			trb_write_type(trb, TRB_TYPE_DATA_STAGE);
>> +		else
>> +			trb_write_type(trb, TRB_TYPE_STATUS_STAGE);
>> +
>> +		if (xudc->setup_state == DATA_STAGE_XFER ||
>> +		    xudc->setup_state == STATUS_STAGE_XFER)
>> +			trb_write_data_stage_dir(trb, 1);
>> +		else
>> +			trb_write_data_stage_dir(trb, 0);
>> +	} else if (usb_endpoint_xfer_isoc(ep->desc)) {
>> +		trb_write_type(trb, TRB_TYPE_ISOCH);
>> +		trb_write_sia(trb, 1);
>> +		trb_write_frame_id(trb, 0);
>> +		trb_write_tlbpc(trb, 0);
>> +	} else if (usb_ss_max_streams(ep->comp_desc)) {
>> +		trb_write_type(trb, TRB_TYPE_STREAM);
>> +		trb_write_stream_id(trb, req->usb_req.stream_id);
>> +	} else {
>> +		trb_write_type(trb, TRB_TYPE_NORMAL);
>> +		trb_write_stream_id(trb, 0);
>> +	}
>> +
>> +	trb_write_cycle(trb, ep->pcs);
>> +
>> +	req->trbs_queued++;
>> +	req->buf_queued += len;
>> +
>> +	dump_trb(xudc, "TRANSFER", trb);
>> +}
>> +
>> +static unsigned int tegra_xudc_queue_trbs(struct tegra_xudc_ep *ep,
>> +					  struct tegra_xudc_request *req)
>> +{
>> +	unsigned int i, count, available;
>> +	bool wait_td = false;
>> +
>> +	available = ep_available_trbs(ep);
>> +	count = req->trbs_needed - req->trbs_queued;
>> +	if (available < count) {
>> +		count = available;
>> +		ep->ring_full = true;
>> +	}
>> +
>> +	/*
>> +	 * To generate zero-length packet on USB bus, SW needs schedule a
>> +	 * standalone zero-length TD. According to HW's behavior, SW needs
>> +	 * to schedule TDs in different ways for different endpoint types.
>> +	 *
>> +	 * For control endpoint:
>> +	 * - Data stage TD (IOC = 1, CH = 0)
>> +	 * - Ring doorbell and wait transfer event
>> +	 * - Data stage TD for ZLP (IOC = 1, CH = 0)
>> +	 * - Ring doorbell
>> +	 *
>> +	 * For bulk and interrupt endpoints:
>> +	 * - Normal transfer TD (IOC = 0, CH = 0)
>> +	 * - Normal transfer TD for ZLP (IOC = 1, CH = 0)
>> +	 * - Ring doorbell
>> +	 */
>> +
>> +	if (req->need_zlp && usb_endpoint_xfer_control(ep->desc) && count > 1)
>> +		wait_td = true;
>> +
>> +	if (!req->first_trb)
>> +		req->first_trb = &ep->transfer_ring[ep->enq_ptr];
>> +
>> +	for (i = 0; i < count; i++) {
>> +		struct tegra_xudc_trb *trb = &ep->transfer_ring[ep->enq_ptr];
>> +		bool ioc = false;
>> +
>> +		if ((i == count - 1) || (wait_td && i == count - 2))
>> +			ioc = true;
>> +
>> +		tegra_xudc_queue_one_trb(ep, req, trb, ioc);
>> +		req->last_trb = trb;
>> +
>> +		ep->enq_ptr++;
>> +		if (ep->enq_ptr == XUDC_TRANSFER_RING_SIZE - 1) {
>> +			trb = &ep->transfer_ring[ep->enq_ptr];
>> +			trb_write_cycle(trb, ep->pcs);
>> +			ep->pcs = !ep->pcs;
>> +			ep->enq_ptr = 0;
>> +		}
>> +
>> +		if (ioc)
>> +			break;
>> +	}
>> +
>> +	return count;
>> +}
>> +
>> +static void tegra_xudc_ep_ring_doorbell(struct tegra_xudc_ep *ep)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	u32 val;
>> +
>> +	if (list_empty(&ep->queue))
>> +		return;
>> +
>> +	val = ep->index << DB_TARGET_SHIFT;
>> +	if (usb_endpoint_xfer_control(ep->desc)) {
>> +		val |= xudc->setup_seq_num << DB_STREAMID_SHIFT;
>> +	} else if (usb_ss_max_streams(ep->comp_desc) > 0) {
>> +		struct tegra_xudc_request *req;
>> +
>> +		/* Don't ring doorbell if the stream has been rejected. */
>> +		if (ep->stream_rejected)
>> +			return;
>> +
>> +		req = list_first_entry(&ep->queue, struct tegra_xudc_request,
>> +				       list);
>> +		val |= req->usb_req.stream_id << DB_STREAMID_SHIFT;
>> +	}
>> +
>> +	dev_dbg(xudc->dev, "ring doorbell: %#x\n", val);
>> +	xudc_writel(xudc, val, DB);
>> +}
>> +
>> +static void tegra_xudc_ep_kick_queue(struct tegra_xudc_ep *ep)
>> +{
>> +	struct tegra_xudc_request *req;
>> +	bool trbs_queued = false;
>> +
>> +	list_for_each_entry(req, &ep->queue, list) {
>> +		if (ep->ring_full)
>> +			break;
>> +
>> +		if (tegra_xudc_queue_trbs(ep, req) > 0)
>> +			trbs_queued = true;
>> +	}
>> +
>> +	if (trbs_queued)
>> +		tegra_xudc_ep_ring_doorbell(ep);
>> +}
>> +
>> +static int
>> +__tegra_xudc_ep_queue(struct tegra_xudc_ep *ep, struct tegra_xudc_request *req)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	int err;
>> +
>> +	if (usb_endpoint_xfer_control(ep->desc) && !list_empty(&ep->queue)) {
>> +		dev_err(xudc->dev, "control EP has pending transfers\n");
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (usb_endpoint_xfer_control(ep->desc)) {
>> +		err = usb_gadget_map_request(&xudc->gadget, &req->usb_req,
>> +					     (xudc->setup_state ==
>> +					      DATA_STAGE_XFER));
>> +	} else {
>> +		err = usb_gadget_map_request(&xudc->gadget, &req->usb_req,
>> +					     usb_endpoint_dir_in(ep->desc));
>> +	}
>> +
>> +	if (err < 0) {
>> +		dev_err(xudc->dev, "failed to map request: %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	req->first_trb = NULL;
>> +	req->last_trb = NULL;
>> +	req->buf_queued = 0;
>> +	req->trbs_queued = 0;
>> +	req->need_zlp = false;
>> +	req->trbs_needed = DIV_ROUND_UP(req->usb_req.length,
>> +					XUDC_TRB_MAX_BUFFER_SIZE);
>> +	if (req->usb_req.length == 0)
>> +		req->trbs_needed++;
>> +
>> +	if (!usb_endpoint_xfer_isoc(ep->desc) &&
>> +	    req->usb_req.zero && (req->usb_req.length != 0) &&
>> +	    ((req->usb_req.length % ep->usb_ep.maxpacket) == 0)) {
>> +		req->trbs_needed++;
>> +		req->need_zlp = true;
>> +	}
>> +
>> +	req->usb_req.status = -EINPROGRESS;
>> +	req->usb_req.actual = 0;
>> +
>> +	list_add_tail(&req->list, &ep->queue);
>> +
>> +	tegra_xudc_ep_kick_queue(ep);
>> +
>> +	return 0;
>> +}
>> +
>> +static int
>> +tegra_xudc_ep_queue(struct usb_ep *usb_ep, struct usb_request *usb_req,
>> +		    gfp_t gfp)
>> +{
>> +	struct tegra_xudc_request *req;
>> +	struct tegra_xudc_ep *ep;
>> +	struct tegra_xudc *xudc;
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	if (!usb_ep || !usb_req)
>> +		return -EINVAL;
>> +
>> +	ep = to_xudc_ep(usb_ep);
>> +	req = to_xudc_req(usb_req);
>> +	xudc = ep->xudc;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	if (xudc->powergated || !ep->desc) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = __tegra_xudc_ep_queue(ep, req);
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static void squeeze_transfer_ring(struct tegra_xudc_ep *ep,
>> +				  struct tegra_xudc_request *req)
>> +{
>> +	struct tegra_xudc_trb *trb = req->first_trb;
>> +	bool pcs_enq = trb_read_cycle(trb);
>> +	bool pcs;
>> +
>> +	/*
>> +	 * Clear out all the TRBs part of or after the cancelled request,
>> +	 * and must correct trb cycle bit to the last un-enqueued state.
>> +	 */
>> +	while (trb != &ep->transfer_ring[ep->enq_ptr]) {
>> +		pcs = trb_read_cycle(trb);
>> +		memset(trb, 0, sizeof(*trb));
>> +		trb_write_cycle(trb, !pcs);
>> +		trb++;
>> +
>> +		if (trb_read_type(trb) == TRB_TYPE_LINK)
>> +			trb = ep->transfer_ring;
>> +	}
>> +
>> +	/* Requests will be re-queued at the start of the cancelled request. */
>> +	ep->enq_ptr = req->first_trb - ep->transfer_ring;
>> +	/*
>> +	 * Retrieve the correct cycle bit state from the first trb of
>> +	 * the cancelled request.
>> +	 */
>> +	ep->pcs = pcs_enq;
>> +	ep->ring_full = false;
>> +	list_for_each_entry_continue(req, &ep->queue, list) {
>> +		req->usb_req.status = -EINPROGRESS;
>> +		req->usb_req.actual = 0;
>> +
>> +		req->first_trb = NULL;
>> +		req->last_trb = NULL;
>> +		req->buf_queued = 0;
>> +		req->trbs_queued = 0;
>> +	}
>> +}
>> +
>> +/*
>> + * Determine if the given TRB is in the range [first trb, last trb] for the
>> + * given request.
>> + */
>> +static bool trb_in_request(struct tegra_xudc_ep *ep,
>> +			   struct tegra_xudc_request *req,
>> +			   struct tegra_xudc_trb *trb)
>> +{
>> +	dev_dbg(ep->xudc->dev, "%s: request %p -> %p; trb %p\n", __func__,
>> +		req->first_trb, req->last_trb, trb);
>> +
>> +	if (trb >= req->first_trb && (trb <= req->last_trb ||
>> +				      req->last_trb < req->first_trb))
>> +		return true;
>> +
>> +	if (trb < req->first_trb && trb <= req->last_trb &&
>> +	    req->last_trb < req->first_trb)
>> +		return true;
>> +
>> +	return false;
>> +}
>> +
>> +/*
>> + * Determine if the given TRB is in the range [EP enqueue pointer, first TRB)
>> + * for the given endpoint and request.
>> + */
>> +static bool trb_before_request(struct tegra_xudc_ep *ep,
>> +			       struct tegra_xudc_request *req,
>> +			       struct tegra_xudc_trb *trb)
>> +{
>> +	struct tegra_xudc_trb *enq_trb = &ep->transfer_ring[ep->enq_ptr];
>> +
>> +	dev_dbg(ep->xudc->dev, "%s: request %p -> %p; enq ptr: %p; trb %p\n",
>> +		__func__, req->first_trb, req->last_trb, enq_trb, trb);
>> +
>> +	if (trb < req->first_trb && (enq_trb <= trb ||
>> +				     req->first_trb < enq_trb))
>> +		return true;
>> +
>> +	if (trb > req->first_trb && req->first_trb < enq_trb && enq_trb <= trb)
>> +		return true;
>> +
>> +	return false;
>> +}
>> +
>> +static int
>> +__tegra_xudc_ep_dequeue(struct tegra_xudc_ep *ep,
>> +			struct tegra_xudc_request *req)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	struct tegra_xudc_request *r;
>> +	struct tegra_xudc_trb *deq_trb;
>> +	bool busy, kick_queue = false;
>> +	int ret = 0;
>> +
>> +	/* Make sure the request is actually queued to this endpoint. */
>> +	list_for_each_entry(r, &ep->queue, list) {
>> +		if (r == req)
>> +			break;
>> +	}
>> +
>> +	if (r != req)
>> +		return -EINVAL;
>> +
>> +	/* Request hasn't been queued in the transfer ring yet. */
>> +	if (!req->trbs_queued) {
>> +		tegra_xudc_req_done(ep, req, -ECONNRESET);
>> +		return 0;
>> +	}
>> +
>> +	/* Halt DMA for this endpiont. */
>> +	if (ep_ctx_read_state(ep->context) == EP_STATE_RUNNING) {
>> +		ep_pause(xudc, ep->index);
>> +		ep_wait_for_inactive(xudc, ep->index);
>> +	}
>> +
>> +	deq_trb = trb_phys_to_virt(ep, ep_ctx_read_deq_ptr(ep->context));
>> +	/* Is the hardware processing the TRB at the dequeue pointer? */
>> +	busy = (trb_read_cycle(deq_trb) == ep_ctx_read_dcs(ep->context));
>> +
>> +	if (trb_in_request(ep, req, deq_trb) && busy) {
>> +		/*
>> +		 * Request has been partially completed or it hasn't
>> +		 * started processing yet.
>> +		 */
>> +		dma_addr_t deq_ptr;
>> +
>> +		squeeze_transfer_ring(ep, req);
>> +
>> +		req->usb_req.actual = ep_ctx_read_edtla(ep->context);
>> +		tegra_xudc_req_done(ep, req, -ECONNRESET);
>> +		kick_queue = true;
>> +
>> +		/* EDTLA is > 0: request has been partially completed */
>> +		if (req->usb_req.actual > 0) {
>> +			/*
>> +			 * Abort the pending transfer and update the dequeue
>> +			 * pointer
>> +			 */
>> +			ep_ctx_write_edtla(ep->context, 0);
>> +			ep_ctx_write_partial_td(ep->context, 0);
>> +			ep_ctx_write_data_offset(ep->context, 0);
>> +
>> +			deq_ptr = trb_virt_to_phys(ep,
>> +					&ep->transfer_ring[ep->enq_ptr]);
>> +
>> +			if (dma_mapping_error(xudc->dev, deq_ptr))
>> +				ret = -EINVAL;
>> +			else {
>> +				ep_ctx_write_deq_ptr(ep->context, deq_ptr);
>> +				ep_ctx_write_dcs(ep->context, ep->pcs);
>> +				ep_reload(xudc, ep->index);
>> +			}
>> +		}
>> +	} else if (trb_before_request(ep, req, deq_trb) && busy) {
>> +		/* Request hasn't started processing yet. */
>> +		squeeze_transfer_ring(ep, req);
>> +
>> +		tegra_xudc_req_done(ep, req, -ECONNRESET);
>> +		kick_queue = true;
>> +	} else {
>> +		/*
>> +		 * Request has completed, but we haven't processed the
>> +		 * completion event yet.
>> +		 */
>> +		tegra_xudc_req_done(ep, req, -ECONNRESET);
>> +		ret = -EINVAL;
>> +	}
>> +
>> +	/* Resume the endpoint. */
>> +	ep_unpause(xudc, ep->index);
>> +
>> +	if (kick_queue)
>> +		tegra_xudc_ep_kick_queue(ep);
>> +
>> +	return ret;
>> +}
>> +
>> +static int
>> +tegra_xudc_ep_dequeue(struct usb_ep *usb_ep, struct usb_request *usb_req)
>> +{
>> +	struct tegra_xudc_request *req;
>> +	struct tegra_xudc_ep *ep;
>> +	struct tegra_xudc *xudc;
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	if (!usb_ep || !usb_req)
>> +		return -EINVAL;
>> +
>> +	ep = to_xudc_ep(usb_ep);
>> +	req = to_xudc_req(usb_req);
>> +	xudc = ep->xudc;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (xudc->powergated || !ep->desc) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = __tegra_xudc_ep_dequeue(ep, req);
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static int __tegra_xudc_ep_set_halt(struct tegra_xudc_ep *ep, bool halt)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +
>> +	if (!ep->desc)
>> +		return -EINVAL;
>> +
>> +	if (usb_endpoint_xfer_isoc(ep->desc)) {
>> +		dev_err(xudc->dev, "can't halt isoc EP\n");
>> +		return -ENOTSUPP;
>> +	}
>> +
>> +	if (!!(xudc_readl(xudc, EP_HALT) & BIT(ep->index)) == halt) {
>> +		dev_dbg(xudc->dev, "EP %u already %s\n", ep->index,
>> +			halt ? "halted" : "not halted");
>> +		return 0;
>> +	}
>> +
>> +	if (halt) {
>> +		ep_halt(xudc, ep->index);
>> +	} else {
>> +		ep_ctx_write_state(ep->context, EP_STATE_DISABLED);
>> +
>> +		ep_reload(xudc, ep->index);
>> +
>> +		ep_ctx_write_state(ep->context, EP_STATE_RUNNING);
>> +		ep_ctx_write_seq_num(ep->context, 0);
>> +
>> +		ep_reload(xudc, ep->index);
>> +		ep_unpause(xudc, ep->index);
>> +		ep_unhalt(xudc, ep->index);
>> +
>> +		tegra_xudc_ep_ring_doorbell(ep);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_ep_set_halt(struct usb_ep *usb_ep, int value)
>> +{
>> +	struct tegra_xudc_ep *ep;
>> +	struct tegra_xudc *xudc;
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	if (!usb_ep)
>> +		return -EINVAL;
>> +
>> +	ep = to_xudc_ep(usb_ep);
>> +	xudc = ep->xudc;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	if (xudc->powergated) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	if (value && usb_endpoint_dir_in(ep->desc) &&
>> +	    !list_empty(&ep->queue)) {
>> +		dev_err(xudc->dev, "can't halt EP with requests pending\n");
>> +		ret = -EAGAIN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = __tegra_xudc_ep_set_halt(ep, value);
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static void tegra_xudc_ep_context_setup(struct tegra_xudc_ep *ep)
>> +{
>> +	const struct usb_endpoint_descriptor *desc = ep->desc;
>> +	const struct usb_ss_ep_comp_descriptor *comp_desc = ep->comp_desc;
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	u16 maxpacket, maxburst = 0, esit = 0;
>> +	u32 val;
>> +
>> +	maxpacket = usb_endpoint_maxp(desc) & 0x7ff;
>> +	if (xudc->gadget.speed == USB_SPEED_SUPER) {
>> +		if (!usb_endpoint_xfer_control(desc))
>> +			maxburst = comp_desc->bMaxBurst;
>> +
>> +		if (usb_endpoint_xfer_int(desc) || usb_endpoint_xfer_isoc(desc))
>> +			esit = le16_to_cpu(comp_desc->wBytesPerInterval);
>> +	} else if ((xudc->gadget.speed < USB_SPEED_SUPER) &&
>> +		   (usb_endpoint_xfer_int(desc) ||
>> +		    usb_endpoint_xfer_isoc(desc))) {
>> +		if (xudc->gadget.speed == USB_SPEED_HIGH) {
>> +			maxburst = (usb_endpoint_maxp(desc) >> 11) & 0x3;
>> +			if (maxburst == 0x3) {
>> +				dev_warn(xudc->dev,
>> +					 "invalid endpoint maxburst\n");
>> +				maxburst = 0x2;
>> +			}
>> +		}
>> +		esit = maxpacket * (maxburst + 1);
>> +	}
>> +
>> +	memset(ep->context, 0, sizeof(*ep->context));
>> +
>> +	ep_ctx_write_state(ep->context, EP_STATE_RUNNING);
>> +	ep_ctx_write_interval(ep->context, desc->bInterval);
>> +	if (xudc->gadget.speed == USB_SPEED_SUPER) {
>> +		if (usb_endpoint_xfer_isoc(desc)) {
>> +			ep_ctx_write_mult(ep->context,
>> +					  comp_desc->bmAttributes & 0x3);
>> +		}
>> +
>> +		if (usb_endpoint_xfer_bulk(desc)) {
>> +			ep_ctx_write_max_pstreams(ep->context,
>> +						  comp_desc->bmAttributes &
>> +						  0x1f);
>> +			ep_ctx_write_lsa(ep->context, 1);
>> +		}
>> +	}
>> +
>> +	if (!usb_endpoint_xfer_control(desc) && usb_endpoint_dir_out(desc))
>> +		val = usb_endpoint_type(desc);
>> +	else
>> +		val = usb_endpoint_type(desc) + EP_TYPE_CONTROL;
>> +
>> +	ep_ctx_write_type(ep->context, val);
>> +	ep_ctx_write_cerr(ep->context, 0x3);
>> +	ep_ctx_write_max_packet_size(ep->context, maxpacket);
>> +	ep_ctx_write_max_burst_size(ep->context, maxburst);
>> +
>> +	ep_ctx_write_deq_ptr(ep->context, ep->transfer_ring_phys);
>> +	ep_ctx_write_dcs(ep->context, ep->pcs);
>> +
>> +	/* Select a reasonable average TRB length based on endpoint type. */
>> +	switch (usb_endpoint_type(desc)) {
>> +	case USB_ENDPOINT_XFER_CONTROL:
>> +		val = 8;
>> +		break;
>> +	case USB_ENDPOINT_XFER_INT:
>> +		val = 1024;
>> +		break;
>> +	case USB_ENDPOINT_XFER_BULK:
>> +	case USB_ENDPOINT_XFER_ISOC:
>> +	default:
>> +		val = 3072;
>> +		break;
>> +	}
>> +
>> +	ep_ctx_write_avg_trb_len(ep->context, val);
>> +	ep_ctx_write_max_esit_payload(ep->context, esit);
>> +
>> +	ep_ctx_write_cerrcnt(ep->context, 0x3);
>> +}
>> +
>> +static void setup_link_trb(struct tegra_xudc_ep *ep,
>> +			   struct tegra_xudc_trb *trb)
>> +{
>> +	trb_write_data_ptr(trb, ep->transfer_ring_phys);
>> +	trb_write_type(trb, TRB_TYPE_LINK);
>> +	trb_write_toggle_cycle(trb, 1);
>> +}
>> +
>> +static int __tegra_xudc_ep_disable(struct tegra_xudc_ep *ep)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +
>> +	if (ep_ctx_read_state(ep->context) == EP_STATE_DISABLED) {
>> +		dev_err(xudc->dev, "endpoint %u already disabled\n",
>> +			ep->index);
>> +		return -EINVAL;
>> +	}
>> +
>> +	ep_ctx_write_state(ep->context, EP_STATE_DISABLED);
>> +
>> +	ep_reload(xudc, ep->index);
>> +
>> +	tegra_xudc_ep_nuke(ep, -ESHUTDOWN);
>> +
>> +	xudc->nr_enabled_eps--;
>> +	if (usb_endpoint_xfer_isoc(ep->desc))
>> +		xudc->nr_isoch_eps--;
>> +
>> +	ep->desc = NULL;
>> +	ep->comp_desc = NULL;
>> +
>> +	memset(ep->context, 0, sizeof(*ep->context));
>> +
>> +	ep_unpause(xudc, ep->index);
>> +	ep_unhalt(xudc, ep->index);
>> +	if (xudc_readl(xudc, EP_STOPPED) & BIT(ep->index))
>> +		xudc_writel(xudc, BIT(ep->index), EP_STOPPED);
>> +
>> +	/*
>> +	 * If this is the last endpoint disabled in a de-configure request,
>> +	 * switch back to address state.
>> +	 */
>> +	if ((xudc->device_state == USB_STATE_CONFIGURED) &&
>> +	    (xudc->nr_enabled_eps == 1)) {
>> +		u32 val;
>> +
>> +		xudc->device_state = USB_STATE_ADDRESS;
>> +		usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +		val = xudc_readl(xudc, CTRL);
>> +		val &= ~CTRL_RUN;
>> +		xudc_writel(xudc, val, CTRL);
>> +	}
>> +
>> +	dev_info(xudc->dev, "ep %u disabled\n", ep->index);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_ep_disable(struct usb_ep *usb_ep)
>> +{
>> +	struct tegra_xudc_ep *ep;
>> +	struct tegra_xudc *xudc;
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	if (!usb_ep)
>> +		return -EINVAL;
>> +
>> +	ep = to_xudc_ep(usb_ep);
>> +	xudc = ep->xudc;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	if (xudc->powergated) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = __tegra_xudc_ep_disable(ep);
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static int __tegra_xudc_ep_enable(struct tegra_xudc_ep *ep,
>> +				  const struct usb_endpoint_descriptor *desc)
>> +{
>> +	struct tegra_xudc *xudc = ep->xudc;
>> +	unsigned int i;
>> +	u32 val;
>> +
>> +	if (xudc->gadget.speed == USB_SPEED_SUPER &&
>> +		!usb_endpoint_xfer_control(desc) && !ep->usb_ep.comp_desc)
>> +		return -EINVAL;
>> +
>> +	/* Disable the EP if it is not disabled */
>> +	if (ep_ctx_read_state(ep->context) != EP_STATE_DISABLED)
>> +		__tegra_xudc_ep_disable(ep);
>> +
>> +	ep->desc = desc;
>> +	ep->comp_desc = ep->usb_ep.comp_desc;
>> +
>> +	if (usb_endpoint_xfer_isoc(desc)) {
>> +		if (xudc->nr_isoch_eps > XUDC_MAX_ISOCH_EPS) {
>> +			dev_err(xudc->dev, "too many isoch endpoints\n");
>> +			return -EBUSY;
>> +		}
>> +		xudc->nr_isoch_eps++;
>> +	}
>> +
>> +	memset(ep->transfer_ring, 0, XUDC_TRANSFER_RING_SIZE *
>> +	       sizeof(*ep->transfer_ring));
>> +	setup_link_trb(ep, &ep->transfer_ring[XUDC_TRANSFER_RING_SIZE - 1]);
>> +
>> +	ep->enq_ptr = 0;
>> +	ep->deq_ptr = 0;
>> +	ep->pcs = true;
>> +	ep->ring_full = false;
>> +	xudc->nr_enabled_eps++;
>> +
>> +	tegra_xudc_ep_context_setup(ep);
>> +
>> +	/*
>> +	 * No need to reload and un-halt EP0.  This will be done automatically
>> +	 * once a valid SETUP packet is received.
>> +	 */
>> +	if (usb_endpoint_xfer_control(desc))
>> +		goto out;
>> +
>> +	/*
>> +	 * Transition to configured state once the first non-control
>> +	 * endpoint is enabled.
>> +	 */
>> +	if (xudc->device_state == USB_STATE_ADDRESS) {
>> +		val = xudc_readl(xudc, CTRL);
>> +		val |= CTRL_RUN;
>> +		xudc_writel(xudc, val, CTRL);
>> +
>> +		xudc->device_state = USB_STATE_CONFIGURED;
>> +		usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +	}
>> +
>> +	if (usb_endpoint_xfer_isoc(desc)) {
>> +		/*
>> +		 * Pause all bulk endpoints when enabling an isoch endpoint
>> +		 * to ensure the isoch endpoint is allocated enough bandwidth.
>> +		 */
>> +		for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
>> +			if (xudc->ep[i].desc &&
>> +			    usb_endpoint_xfer_bulk(xudc->ep[i].desc))
>> +				ep_pause(xudc, i);
>> +		}
>> +	}
>> +
>> +	ep_reload(xudc, ep->index);
>> +	ep_unpause(xudc, ep->index);
>> +	ep_unhalt(xudc, ep->index);
>> +
>> +	if (usb_endpoint_xfer_isoc(desc)) {
>> +		for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
>> +			if (xudc->ep[i].desc &&
>> +			    usb_endpoint_xfer_bulk(xudc->ep[i].desc))
>> +				ep_unpause(xudc, i);
>> +		}
>> +	}
>> +
>> +out:
>> +	dev_info(xudc->dev, "EP %u (type: %s, dir: %s) enabled\n", ep->index,
>> +		 usb_ep_type_string(usb_endpoint_type(ep->desc)),
>> +		 usb_endpoint_dir_in(ep->desc) ? "in" : "out");
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_ep_enable(struct usb_ep *usb_ep,
>> +				const struct usb_endpoint_descriptor *desc)
>> +{
>> +	struct tegra_xudc_ep *ep;
>> +	struct tegra_xudc *xudc;
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	if  (!usb_ep || !desc || (desc->bDescriptorType != USB_DT_ENDPOINT))
>> +		return -EINVAL;
>> +
>> +	ep = to_xudc_ep(usb_ep);
>> +	xudc = ep->xudc;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	if (xudc->powergated) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = __tegra_xudc_ep_enable(ep, desc);
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static struct usb_request *
>> +tegra_xudc_ep_alloc_request(struct usb_ep *usb_ep, gfp_t gfp)
>> +{
>> +	struct tegra_xudc_request *req;
>> +
>> +	req = kzalloc(sizeof(*req), gfp);
>> +	if (!req)
>> +		return NULL;
>> +
>> +	INIT_LIST_HEAD(&req->list);
>> +
>> +	return &req->usb_req;
>> +}
>> +
>> +static void tegra_xudc_ep_free_request(struct usb_ep *usb_ep,
>> +				       struct usb_request *usb_req)
>> +{
>> +	struct tegra_xudc_request *req = to_xudc_req(usb_req);
>> +
>> +	kfree(req);
>> +}
>> +
>> +static struct usb_ep_ops tegra_xudc_ep_ops = {
>> +	.enable = tegra_xudc_ep_enable,
>> +	.disable = tegra_xudc_ep_disable,
>> +	.alloc_request = tegra_xudc_ep_alloc_request,
>> +	.free_request = tegra_xudc_ep_free_request,
>> +	.queue = tegra_xudc_ep_queue,
>> +	.dequeue = tegra_xudc_ep_dequeue,
>> +	.set_halt = tegra_xudc_ep_set_halt,
>> +};
>> +
>> +static int tegra_xudc_ep0_enable(struct usb_ep *usb_ep,
>> +				 const struct usb_endpoint_descriptor *desc)
>> +{
>> +	return -EBUSY;
>> +}
>> +
>> +static int tegra_xudc_ep0_disable(struct usb_ep *usb_ep)
>> +{
>> +	return -EBUSY;
>> +}
>> +
>> +static struct usb_ep_ops tegra_xudc_ep0_ops = {
>> +	.enable = tegra_xudc_ep0_enable,
>> +	.disable = tegra_xudc_ep0_disable,
>> +	.alloc_request = tegra_xudc_ep_alloc_request,
>> +	.free_request = tegra_xudc_ep_free_request,
>> +	.queue = tegra_xudc_ep_queue,
>> +	.dequeue = tegra_xudc_ep_dequeue,
>> +	.set_halt = tegra_xudc_ep_set_halt,
>> +};
>> +
>> +static int tegra_xudc_gadget_get_frame(struct usb_gadget *gadget)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +	unsigned long flags;
>> +	int ret;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	if (xudc->powergated) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +
>> +	ret = (xudc_readl(xudc, MFINDEX) >> MFINDEX_FRAME_SHIFT) &
>> +		MFINDEX_FRAME_MASK;
>> +unlock:
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static void tegra_xudc_resume_device_state(struct tegra_xudc *xudc)
>> +{
>> +	unsigned int i;
>> +	u32 val;
>> +
>> +	ep_unpause_all(xudc);
>> +
>> +	/* Direct link to U0. */
>> +	val = xudc_readl(xudc, PORTSC);
>> +	if (((val >> PORTSC_PLS_SHIFT) & PORTSC_PLS_MASK) != PORTSC_PLS_U0) {
>> +		val &= ~(PORTSC_CHANGE_MASK |
>> +			 (PORTSC_PLS_MASK << PORTSC_PLS_SHIFT));
>> +		val |= PORTSC_LWS | (PORTSC_PLS_U0 << PORTSC_PLS_SHIFT);
>> +		xudc_writel(xudc, val, PORTSC);
>> +	}
>> +
>> +	if (xudc->device_state == USB_STATE_SUSPENDED) {
>> +		xudc->device_state = xudc->resume_state;
>> +		usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +		xudc->resume_state = 0;
>> +	}
>> +
>> +	/*
>> +	 * Doorbells may be dropped if they are sent too soon (< ~200ns)
>> +	 * after unpausing the endpoint.  Wait for 500ns just to be safe.
>> +	 */
>> +	ndelay(500);
>> +	for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
>> +		tegra_xudc_ep_ring_doorbell(&xudc->ep[i]);
>> +}
>> +
>> +static int tegra_xudc_gadget_wakeup(struct usb_gadget *gadget)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +	unsigned long flags;
>> +	int ret = 0;
>> +	u32 val;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (xudc->powergated) {
>> +		ret = -ESHUTDOWN;
>> +		goto unlock;
>> +	}
>> +	val = xudc_readl(xudc, PORTPM);
>> +	dev_dbg(xudc->dev, "%s: PORTPM=%#x, speed=%x\n", __func__,
>> +			val, gadget->speed);
>> +
>> +	if (((xudc->gadget.speed <= USB_SPEED_HIGH) &&
>> +	     (val & PORTPM_RWE)) ||
>> +	    ((xudc->gadget.speed == USB_SPEED_SUPER) &&
>> +	     (val & PORTPM_FRWE))) {
>> +		tegra_xudc_resume_device_state(xudc);
>> +
>> +		/* Send Device Notification packet. */
>> +		if (xudc->gadget.speed == USB_SPEED_SUPER) {
>> +			val = (DEVNOTIF_LO_TYPE_FUNCTION_WAKE <<
>> +			       DEVNOTIF_LO_TYPE_SHIFT) | DEVNOTIF_LO_TRIG;
>> +			xudc_writel(xudc, 0, DEVNOTIF_HI);
>> +			xudc_writel(xudc, val, DEVNOTIF_LO);
>> +		}
>> +	}
>> +
>> +unlock:
>> +	dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return ret;
>> +}
>> +
>> +static int tegra_xudc_gadget_pullup(struct usb_gadget *gadget, int is_on)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +	unsigned long flags;
>> +	u32 val;
>> +
>> +	pm_runtime_get_sync(xudc->dev);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (is_on != xudc->pullup) {
>> +		val = xudc_readl(xudc, CTRL);
>> +		if (is_on)
>> +			val |= CTRL_ENABLE;
>> +		else
>> +			val &= ~CTRL_ENABLE;
>> +		xudc_writel(xudc, val, CTRL);
>> +	}
>> +
>> +	xudc->pullup = is_on;
>> +	dev_dbg(xudc->dev, "%s: pullup:%d", __func__, is_on);
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	pm_runtime_put(xudc->dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_gadget_start(struct usb_gadget *gadget,
>> +				   struct usb_gadget_driver *driver)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +	unsigned long flags;
>> +	u32 val;
>> +	int ret;
>> +
>> +	if (!driver)
>> +		return -EINVAL;
>> +
>> +	pm_runtime_get_sync(xudc->dev);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	if (xudc->driver) {
>> +		ret = -EBUSY;
>> +		goto unlock;
>> +	}
>> +
>> +	xudc->setup_state = WAIT_FOR_SETUP;
>> +	xudc->device_state = USB_STATE_DEFAULT;
>> +	usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +	ret = __tegra_xudc_ep_enable(&xudc->ep[0], &tegra_xudc_ep0_desc);
>> +	if (ret < 0)
>> +		goto unlock;
>> +
>> +	val = xudc_readl(xudc, CTRL);
>> +	val |= CTRL_IE | CTRL_LSE;
>> +	xudc_writel(xudc, val, CTRL);
>> +
>> +	val = xudc_readl(xudc, PORTHALT);
>> +	val |= PORTHALT_STCHG_INTR_EN;
>> +	xudc_writel(xudc, val, PORTHALT);
>> +
>> +	if (xudc->pullup) {
>> +		val = xudc_readl(xudc, CTRL);
>> +		val |= CTRL_ENABLE;
>> +		xudc_writel(xudc, val, CTRL);
>> +	}
>> +
>> +	xudc->driver = driver;
>> +unlock:
>> +	dev_dbg(xudc->dev, "%s: ret value is %d", __func__, ret);
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	pm_runtime_put(xudc->dev);
>> +
>> +	return ret;
>> +}
>> +
>> +static int tegra_xudc_gadget_stop(struct usb_gadget *gadget)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +	unsigned long flags;
>> +	u32 val;
>> +
>> +	pm_runtime_get_sync(xudc->dev);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	val = xudc_readl(xudc, CTRL);
>> +	val &= ~(CTRL_IE | CTRL_ENABLE);
>> +	xudc_writel(xudc, val, CTRL);
>> +
>> +	__tegra_xudc_ep_disable(&xudc->ep[0]);
>> +
>> +	xudc->driver = NULL;
>> +	dev_dbg(xudc->dev, "Gadget stopped");
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	pm_runtime_put(xudc->dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_set_selfpowered(struct usb_gadget *gadget, int is_on)
>> +{
>> +	struct tegra_xudc *xudc = to_xudc(gadget);
>> +
>> +	dev_dbg(xudc->dev, "%s: %d\n", __func__, is_on);
>> +	xudc->selfpowered = !!is_on;
>> +
>> +	return 0;
>> +}
>> +
>> +static struct usb_gadget_ops tegra_xudc_gadget_ops = {
>> +	.get_frame = tegra_xudc_gadget_get_frame,
>> +	.wakeup = tegra_xudc_gadget_wakeup,
>> +	.pullup = tegra_xudc_gadget_pullup,
>> +	.udc_start = tegra_xudc_gadget_start,
>> +	.udc_stop = tegra_xudc_gadget_stop,
>> +	.set_selfpowered = tegra_xudc_set_selfpowered,
>> +};
>> +
>> +static void no_op_complete(struct usb_ep *ep, struct usb_request *req)
>> +{
>> +}
>> +
>> +static int
>> +tegra_xudc_ep0_queue_status(struct tegra_xudc *xudc,
>> +		void (*cmpl)(struct usb_ep *, struct usb_request *))
>> +{
>> +	xudc->ep0_req->usb_req.buf = NULL;
>> +	xudc->ep0_req->usb_req.dma = 0;
>> +	xudc->ep0_req->usb_req.length = 0;
>> +	xudc->ep0_req->usb_req.complete = cmpl;
>> +	xudc->ep0_req->usb_req.context = xudc;
>> +
>> +	return __tegra_xudc_ep_queue(&xudc->ep[0], xudc->ep0_req);
>> +}
>> +
>> +static int
>> +tegra_xudc_ep0_queue_data(struct tegra_xudc *xudc, void *buf, size_t len,
>> +		void (*cmpl)(struct usb_ep *, struct usb_request *))
>> +{
>> +	xudc->ep0_req->usb_req.buf = buf;
>> +	xudc->ep0_req->usb_req.length = len;
>> +	xudc->ep0_req->usb_req.complete = cmpl;
>> +	xudc->ep0_req->usb_req.context = xudc;
>> +
>> +	return __tegra_xudc_ep_queue(&xudc->ep[0], xudc->ep0_req);
>> +}
>> +
>> +static void tegra_xudc_ep0_req_done(struct tegra_xudc *xudc)
>> +{
>> +	switch (xudc->setup_state) {
>> +	case DATA_STAGE_XFER:
>> +		xudc->setup_state = STATUS_STAGE_RECV;
>> +		tegra_xudc_ep0_queue_status(xudc, no_op_complete);
>> +		break;
>> +	case DATA_STAGE_RECV:
>> +		xudc->setup_state = STATUS_STAGE_XFER;
>> +		tegra_xudc_ep0_queue_status(xudc, no_op_complete);
>> +		break;
>> +	default:
>> +		xudc->setup_state = WAIT_FOR_SETUP;
>> +		break;
>> +	}
>> +}
>> +
>> +static int tegra_xudc_ep0_delegate_req(struct tegra_xudc *xudc,
>> +				       struct usb_ctrlrequest *ctrl)
>> +{
>> +	int ret;
>> +
>> +	spin_unlock(&xudc->lock);
>> +	ret = xudc->driver->setup(&xudc->gadget, ctrl);
>> +	spin_lock(&xudc->lock);
>> +
>> +	return ret;
>> +}
>> +
>> +static void set_feature_complete(struct usb_ep *ep, struct usb_request *req)
>> +{
>> +	struct tegra_xudc *xudc = req->context;
>> +
>> +	if (xudc->test_mode_pattern) {
>> +		xudc_writel(xudc, xudc->test_mode_pattern, PORT_TM);
>> +		xudc->test_mode_pattern = 0;
>> +	}
>> +}
>> +
>> +static int tegra_xudc_ep0_set_feature(struct tegra_xudc *xudc,
>> +				      struct usb_ctrlrequest *ctrl)
>> +{
>> +	bool set = (ctrl->bRequest == USB_REQ_SET_FEATURE);
>> +	u32 feature = le16_to_cpu(ctrl->wValue);
>> +	u32 index = le16_to_cpu(ctrl->wIndex);
>> +	u32 val, ep;
>> +	int ret;
>> +
>> +	if (le16_to_cpu(ctrl->wLength) != 0)
>> +		return -EINVAL;
>> +
>> +	switch (ctrl->bRequestType & USB_RECIP_MASK) {
>> +	case USB_RECIP_DEVICE:
>> +		switch (feature) {
>> +		case USB_DEVICE_REMOTE_WAKEUP:
>> +			if ((xudc->gadget.speed == USB_SPEED_SUPER) ||
>> +			    (xudc->device_state == USB_STATE_DEFAULT))
>> +				return -EINVAL;
>> +
>> +			val = xudc_readl(xudc, PORTPM);
>> +			if (set)
>> +				val |= PORTPM_RWE;
>> +			else
>> +				val &= ~PORTPM_RWE;
>> +
>> +			xudc_writel(xudc, val, PORTPM);
>> +			break;
>> +		case USB_DEVICE_U1_ENABLE:
>> +		case USB_DEVICE_U2_ENABLE:
>> +			if ((xudc->device_state != USB_STATE_CONFIGURED) ||
>> +			    (xudc->gadget.speed != USB_SPEED_SUPER))
>> +				return -EINVAL;
>> +
>> +			val = xudc_readl(xudc, PORTPM);
>> +			if ((feature == USB_DEVICE_U1_ENABLE) &&
>> +			     xudc->soc->u1_enable) {
>> +				if (set)
>> +					val |= PORTPM_U1E;
>> +				else
>> +					val &= ~PORTPM_U1E;
>> +			}
>> +
>> +			if ((feature == USB_DEVICE_U2_ENABLE) &&
>> +			     xudc->soc->u2_enable) {
>> +				if (set)
>> +					val |= PORTPM_U2E;
>> +				else
>> +					val &= ~PORTPM_U2E;
>> +			}
>> +
>> +			xudc_writel(xudc, val, PORTPM);
>> +			break;
>> +		case USB_DEVICE_TEST_MODE:
>> +			if (xudc->gadget.speed != USB_SPEED_HIGH)
>> +				return -EINVAL;
>> +
>> +			if (!set)
>> +				return -EINVAL;
>> +
>> +			xudc->test_mode_pattern = index >> 8;
>> +			break;
>> +		default:
>> +			return -EINVAL;
>> +		}
>> +
>> +		break;
>> +	case USB_RECIP_INTERFACE:
>> +		if (xudc->device_state != USB_STATE_CONFIGURED)
>> +			return -EINVAL;
>> +
>> +		switch (feature) {
>> +		case USB_INTRF_FUNC_SUSPEND:
>> +			if (set) {
>> +				val = xudc_readl(xudc, PORTPM);
>> +
>> +				if (index & USB_INTRF_FUNC_SUSPEND_RW)
>> +					val |= PORTPM_FRWE;
>> +				else
>> +					val &= ~PORTPM_FRWE;
>> +
>> +				xudc_writel(xudc, val, PORTPM);
>> +			}
>> +
>> +			return tegra_xudc_ep0_delegate_req(xudc, ctrl);
>> +		default:
>> +			return -EINVAL;
>> +		}
>> +
>> +		break;
>> +	case USB_RECIP_ENDPOINT:
>> +		ep = (index & USB_ENDPOINT_NUMBER_MASK) * 2 +
>> +			((index & USB_DIR_IN) ? 1 : 0);
>> +
>> +		if ((xudc->device_state == USB_STATE_DEFAULT) ||
>> +		    ((xudc->device_state == USB_STATE_ADDRESS) &&
>> +		     (index != 0)))
>> +			return -EINVAL;
>> +
>> +		ret = __tegra_xudc_ep_set_halt(&xudc->ep[ep], set);
>> +		if (ret < 0)
>> +			return ret;
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	return tegra_xudc_ep0_queue_status(xudc, set_feature_complete);
>> +}
>> +
>> +static int tegra_xudc_ep0_get_status(struct tegra_xudc *xudc,
>> +				     struct usb_ctrlrequest *ctrl)
>> +{
>> +	struct tegra_xudc_ep_context *ep_ctx;
>> +	u32 val, ep, index = le16_to_cpu(ctrl->wIndex);
>> +	u16 status = 0;
>> +
>> +	if (!(ctrl->bRequestType & USB_DIR_IN))
>> +		return -EINVAL;
>> +
>> +	if ((le16_to_cpu(ctrl->wValue) != 0) ||
>> +	    (le16_to_cpu(ctrl->wLength) != 2))
>> +		return -EINVAL;
>> +
>> +	switch (ctrl->bRequestType & USB_RECIP_MASK) {
>> +	case USB_RECIP_DEVICE:
>> +		val = xudc_readl(xudc, PORTPM);
>> +
>> +		if (xudc->selfpowered)
>> +			status |= BIT(USB_DEVICE_SELF_POWERED);
>> +
>> +		if ((xudc->gadget.speed < USB_SPEED_SUPER) &&
>> +		    (val & PORTPM_RWE))
>> +			status |= BIT(USB_DEVICE_REMOTE_WAKEUP);
>> +
>> +		if (xudc->gadget.speed == USB_SPEED_SUPER) {
>> +			if (val & PORTPM_U1E)
>> +				status |= BIT(USB_DEV_STAT_U1_ENABLED);
>> +			if (val & PORTPM_U2E)
>> +				status |= BIT(USB_DEV_STAT_U2_ENABLED);
>> +		}
>> +		break;
>> +	case USB_RECIP_INTERFACE:
>> +		if (xudc->gadget.speed == USB_SPEED_SUPER) {
>> +			status |= USB_INTRF_STAT_FUNC_RW_CAP;
>> +			val = xudc_readl(xudc, PORTPM);
>> +			if (val & PORTPM_FRWE)
>> +				status |= USB_INTRF_STAT_FUNC_RW;
>> +		}
>> +		break;
>> +	case USB_RECIP_ENDPOINT:
>> +		ep = (index & USB_ENDPOINT_NUMBER_MASK) * 2 +
>> +			((index & USB_DIR_IN) ? 1 : 0);
>> +		ep_ctx = &xudc->ep_context[ep];
>> +
>> +		if ((xudc->device_state != USB_STATE_CONFIGURED) &&
>> +		    ((xudc->device_state != USB_STATE_ADDRESS) || (ep != 0)))
>> +			return -EINVAL;
>> +
>> +		if (ep_ctx_read_state(ep_ctx) == EP_STATE_DISABLED)
>> +			return -EINVAL;
>> +
>> +		if (xudc_readl(xudc, EP_HALT) & BIT(ep))
>> +			status |= BIT(USB_ENDPOINT_HALT);
>> +		break;
>> +	default:
>> +		return -EINVAL;
>> +	}
>> +
>> +	xudc->status_buf = cpu_to_le16(status);
>> +	return tegra_xudc_ep0_queue_data(xudc, &xudc->status_buf,
>> +					 sizeof(xudc->status_buf),
>> +					 no_op_complete);
>> +}
>> +
>> +static void set_sel_complete(struct usb_ep *ep, struct usb_request *req)
>> +{
>> +	/* Nothing to do with SEL values */
>> +}
>> +
>> +static int tegra_xudc_ep0_set_sel(struct tegra_xudc *xudc,
>> +				  struct usb_ctrlrequest *ctrl)
>> +{
>> +	if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
>> +				     USB_TYPE_STANDARD))
>> +		return -EINVAL;
>> +
>> +	if (xudc->device_state == USB_STATE_DEFAULT)
>> +		return -EINVAL;
>> +
>> +	if ((le16_to_cpu(ctrl->wIndex) != 0) ||
>> +	    (le16_to_cpu(ctrl->wValue) != 0) ||
>> +	    (le16_to_cpu(ctrl->wLength) != 6))
>> +		return -EINVAL;
>> +
>> +	return tegra_xudc_ep0_queue_data(xudc, &xudc->sel_timing,
>> +					 sizeof(xudc->sel_timing),
>> +					 set_sel_complete);
>> +}
>> +
>> +static void set_isoch_delay_complete(struct usb_ep *ep, struct usb_request *req)
>> +{
>> +	/* Nothing to do with isoch delay */
>> +}
>> +
>> +static int tegra_xudc_ep0_set_isoch_delay(struct tegra_xudc *xudc,
>> +					  struct usb_ctrlrequest *ctrl)
>> +{
>> +	u32 delay = le16_to_cpu(ctrl->wValue);
>> +
>> +	if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
>> +				   USB_TYPE_STANDARD))
>> +		return -EINVAL;
>> +
>> +	if ((delay > 65535) || (le16_to_cpu(ctrl->wIndex) != 0) ||
>> +	    (le16_to_cpu(ctrl->wLength) != 0))
>> +		return -EINVAL;
>> +
>> +	xudc->isoch_delay = delay;
>> +
>> +	return tegra_xudc_ep0_queue_status(xudc, set_isoch_delay_complete);
>> +}
>> +
>> +static void set_address_complete(struct usb_ep *ep, struct usb_request *req)
>> +{
>> +	struct tegra_xudc *xudc = req->context;
>> +
>> +	if ((xudc->device_state == USB_STATE_DEFAULT) &&
>> +	    (xudc->dev_addr != 0)) {
>> +		xudc->device_state = USB_STATE_ADDRESS;
>> +		usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +	} else if ((xudc->device_state == USB_STATE_ADDRESS) &&
>> +		   (xudc->dev_addr == 0)) {
>> +		xudc->device_state = USB_STATE_DEFAULT;
>> +		usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +	}
>> +}
>> +
>> +static int tegra_xudc_ep0_set_address(struct tegra_xudc *xudc,
>> +				      struct usb_ctrlrequest *ctrl)
>> +{
>> +	struct tegra_xudc_ep *ep0 = &xudc->ep[0];
>> +	u32 val, addr = le16_to_cpu(ctrl->wValue);
>> +
>> +	if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_DEVICE |
>> +				     USB_TYPE_STANDARD))
>> +		return -EINVAL;
>> +
>> +	if ((addr > 127) || (le16_to_cpu(ctrl->wIndex) != 0) ||
>> +	    (le16_to_cpu(ctrl->wLength) != 0))
>> +		return -EINVAL;
>> +
>> +	if (xudc->device_state == USB_STATE_CONFIGURED)
>> +		return -EINVAL;
>> +
>> +	dev_dbg(xudc->dev, "set address: %u\n", addr);
>> +
>> +	xudc->dev_addr = addr;
>> +	val = xudc_readl(xudc, CTRL);
>> +	val &= ~(CTRL_DEVADDR_MASK << CTRL_DEVADDR_SHIFT);
>> +	val |= addr << CTRL_DEVADDR_SHIFT;
>> +	xudc_writel(xudc, val, CTRL);
>> +
>> +	ep_ctx_write_devaddr(ep0->context, addr);
>> +
>> +	return tegra_xudc_ep0_queue_status(xudc, set_address_complete);
>> +}
>> +
>> +static int tegra_xudc_ep0_standard_req(struct tegra_xudc *xudc,
>> +				      struct usb_ctrlrequest *ctrl)
>> +{
>> +	int ret;
>> +
>> +	switch (ctrl->bRequest) {
>> +	case USB_REQ_GET_STATUS:
>> +		dev_dbg(xudc->dev, "USB_REQ_GET_STATUS\n");
>> +		ret = tegra_xudc_ep0_get_status(xudc, ctrl);
>> +		break;
>> +	case USB_REQ_SET_ADDRESS:
>> +		dev_dbg(xudc->dev, "USB_REQ_SET_ADDRESS\n");
>> +		ret = tegra_xudc_ep0_set_address(xudc, ctrl);
>> +		break;
>> +	case USB_REQ_SET_SEL:
>> +		dev_dbg(xudc->dev, "USB_REQ_SET_SEL\n");
>> +		ret = tegra_xudc_ep0_set_sel(xudc, ctrl);
>> +		break;
>> +	case USB_REQ_SET_ISOCH_DELAY:
>> +		dev_dbg(xudc->dev, "USB_REQ_SET_ISOCH_DELAY\n");
>> +		ret = tegra_xudc_ep0_set_isoch_delay(xudc, ctrl);
>> +		break;
>> +	case USB_REQ_CLEAR_FEATURE:
>> +	case USB_REQ_SET_FEATURE:
>> +		dev_dbg(xudc->dev, "USB_REQ_CLEAR/SET_FEATURE\n");
>> +		ret = tegra_xudc_ep0_set_feature(xudc, ctrl);
>> +		break;
>> +	case USB_REQ_SET_CONFIGURATION:
>> +		dev_dbg(xudc->dev, "USB_REQ_SET_CONFIGURATION\n");
>> +		/*
>> +		 * In theory we need to clear RUN bit before status stage of
>> +		 * deconfig request sent, but this seems to be causing problems.
>> +		 * Clear RUN once all endpoints are disabled instead.
>> +		 */
>> +	default:
>> +		ret = tegra_xudc_ep0_delegate_req(xudc, ctrl);
>> +		break;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +static void tegra_xudc_handle_ep0_setup_packet(struct tegra_xudc *xudc,
>> +					       struct usb_ctrlrequest *ctrl,
>> +					       u16 seq_num)
>> +{
>> +	int ret;
>> +
>> +	xudc->setup_seq_num = seq_num;
>> +
>> +	/* Ensure EP0 is unhalted. */
>> +	ep_unhalt(xudc, 0);
>> +
>> +	/*
>> +	 * On Tegra210, setup packets with sequence numbers 0xfffe or 0xffff
>> +	 * are invalid.  Halt EP0 until we get a valid packet.
>> +	 */
>> +	if (xudc->soc->invalid_seq_num &&
>> +	    (seq_num == 0xfffe || seq_num == 0xffff)) {
>> +		dev_warn(xudc->dev, "invalid sequence number detected\n");
>> +		ep_halt(xudc, 0);
>> +		return;
>> +	}
>> +
>> +	if (ctrl->wLength)
>> +		xudc->setup_state = (ctrl->bRequestType & USB_DIR_IN) ?
>> +			DATA_STAGE_XFER :  DATA_STAGE_RECV;
>> +	else
>> +		xudc->setup_state = STATUS_STAGE_XFER;
>> +
>> +	if ((ctrl->bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD)
>> +		ret = tegra_xudc_ep0_standard_req(xudc, ctrl);
>> +	else
>> +		ret = tegra_xudc_ep0_delegate_req(xudc, ctrl);
>> +
>> +	if (ret < 0) {
>> +		dev_warn(xudc->dev, "setup request failed: %d\n", ret);
>> +		xudc->setup_state = WAIT_FOR_SETUP;
>> +		ep_halt(xudc, 0);
>> +	}
>> +}
>> +
>> +static void tegra_xudc_handle_ep0_event(struct tegra_xudc *xudc,
>> +					struct tegra_xudc_trb *event)
>> +{
>> +	struct usb_ctrlrequest *ctrl = (struct usb_ctrlrequest *)event;
>> +	u16 seq_num = trb_read_seq_num(event);
>> +
>> +	if (xudc->setup_state != WAIT_FOR_SETUP) {
>> +		/*
>> +		 * The controller is in the process of handling another
>> +		 * setup request.  Queue subsequent requests and handle
>> +		 * the last one once the controller reports a sequence
>> +		 * number error.
>> +		 */
>> +		memcpy(&xudc->setup_packet.ctrl_req, ctrl, sizeof(*ctrl));
>> +		xudc->setup_packet.seq_num = seq_num;
>> +		xudc->queued_setup_packet = true;
>> +	} else {
>> +		tegra_xudc_handle_ep0_setup_packet(xudc, ctrl, seq_num);
>> +	}
>> +}
>> +
>> +static struct tegra_xudc_request *
>> +trb_to_request(struct tegra_xudc_ep *ep, struct tegra_xudc_trb *trb)
>> +{
>> +	struct tegra_xudc_request *req;
>> +
>> +	list_for_each_entry(req, &ep->queue, list) {
>> +		if (!req->trbs_queued)
>> +			break;
>> +
>> +		if (trb_in_request(ep, req, trb))
>> +			return req;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static void tegra_xudc_handle_transfer_completion(struct tegra_xudc *xudc,
>> +						  struct tegra_xudc_ep *ep,
>> +						  struct tegra_xudc_trb *event)
>> +{
>> +	struct tegra_xudc_request *req;
>> +	struct tegra_xudc_trb *trb;
>> +	bool short_packet;
>> +
>> +	short_packet = (trb_read_cmpl_code(event) ==
>> +			TRB_CMPL_CODE_SHORT_PACKET);
>> +
>> +	trb = trb_phys_to_virt(ep, trb_read_data_ptr(event));
>> +	req = trb_to_request(ep, trb);
>> +
>> +	/*
>> +	 * TDs are complete on short packet or when the completed TRB is the
>> +	 * last TRB in the TD (the CHAIN bit is unset).
>> +	 */
>> +	if (req && (short_packet || (!trb_read_chain(trb) &&
>> +		(req->trbs_needed == req->trbs_queued)))) {
>> +		struct tegra_xudc_trb *last = req->last_trb;
>> +		unsigned int residual;
>> +
>> +		residual = trb_read_transfer_len(event);
>> +		req->usb_req.actual = req->usb_req.length - residual;
>> +
>> +		dev_dbg(xudc->dev, "bytes transferred %u / %u\n",
>> +			req->usb_req.actual, req->usb_req.length);
>> +
>> +		tegra_xudc_req_done(ep, req, 0);
>> +
>> +		if (ep->desc && usb_endpoint_xfer_control(ep->desc))
>> +			tegra_xudc_ep0_req_done(xudc);
>> +
>> +		/*
>> +		 * Advance the dequeue pointer past the end of the current TD
>> +		 * on short packet completion.
>> +		 */
>> +		if (short_packet) {
>> +			ep->deq_ptr = (last - ep->transfer_ring) + 1;
>> +			if (ep->deq_ptr == XUDC_TRANSFER_RING_SIZE - 1)
>> +				ep->deq_ptr = 0;
>> +		}
>> +	} else if (!req) {
>> +		dev_warn(xudc->dev, "transfer event on dequeued request\n");
>> +	}
>> +
>> +	if (ep->desc)
>> +		tegra_xudc_ep_kick_queue(ep);
>> +}
>> +
>> +static void tegra_xudc_handle_transfer_event(struct tegra_xudc *xudc,
>> +					     struct tegra_xudc_trb *event)
>> +{
>> +	unsigned int ep_index = trb_read_endpoint_id(event);
>> +	struct tegra_xudc_ep *ep = &xudc->ep[ep_index];
>> +	struct tegra_xudc_trb *trb;
>> +	u16 comp_code;
>> +
>> +	if (ep_ctx_read_state(ep->context) == EP_STATE_DISABLED) {
>> +		dev_warn(xudc->dev, "transfer event on disabled EP %u\n",
>> +			 ep_index);
>> +		return;
>> +	}
>> +
>> +	/* Update transfer ring dequeue pointer. */
>> +	trb = trb_phys_to_virt(ep, trb_read_data_ptr(event));
>> +	comp_code = trb_read_cmpl_code(event);
>> +	if (comp_code != TRB_CMPL_CODE_BABBLE_DETECTED_ERR) {
>> +		ep->deq_ptr = (trb - ep->transfer_ring) + 1;
>> +
>> +		if (ep->deq_ptr == XUDC_TRANSFER_RING_SIZE - 1)
>> +			ep->deq_ptr = 0;
>> +		ep->ring_full = false;
>> +	}
>> +
>> +	switch (comp_code) {
>> +	case TRB_CMPL_CODE_SUCCESS:
>> +	case TRB_CMPL_CODE_SHORT_PACKET:
>> +		tegra_xudc_handle_transfer_completion(xudc, ep, event);
>> +		break;
>> +	case TRB_CMPL_CODE_HOST_REJECTED:
>> +		dev_info(xudc->dev, "stream rejected on EP %u\n", ep_index);
>> +
>> +		ep->stream_rejected = true;
>> +		break;
>> +	case TRB_CMPL_CODE_PRIME_PIPE_RECEIVED:
>> +		dev_info(xudc->dev, "prime pipe received on EP %u\n", ep_index);
>> +
>> +		if (ep->stream_rejected) {
>> +			ep->stream_rejected = false;
>> +			/*
>> +			 * An EP is stopped when a stream is rejected.  Wait
>> +			 * for the EP to report that it is stopped and then
>> +			 * un-stop it.
>> +			 */
>> +			ep_wait_for_stopped(xudc, ep_index);
>> +		}
>> +		tegra_xudc_ep_ring_doorbell(ep);
>> +		break;
>> +	case TRB_CMPL_CODE_BABBLE_DETECTED_ERR:
>> +		/*
>> +		 * Wait for the EP to be stopped so the controller stops
>> +		 * processing doorbells.
>> +		 */
>> +		ep_wait_for_stopped(xudc, ep_index);
>> +		ep->enq_ptr = ep->deq_ptr;
>> +		tegra_xudc_ep_nuke(ep, -EIO);
>> +		/* FALLTHROUGH */
>> +	case TRB_CMPL_CODE_STREAM_NUMP_ERROR:
>> +	case TRB_CMPL_CODE_CTRL_DIR_ERR:
>> +	case TRB_CMPL_CODE_INVALID_STREAM_TYPE_ERR:
>> +	case TRB_CMPL_CODE_RING_UNDERRUN:
>> +	case TRB_CMPL_CODE_RING_OVERRUN:
>> +	case TRB_CMPL_CODE_ISOCH_BUFFER_OVERRUN:
>> +	case TRB_CMPL_CODE_USB_TRANS_ERR:
>> +	case TRB_CMPL_CODE_TRB_ERR:
>> +		dev_err(xudc->dev, "completion error %#x on EP %u\n",
>> +			comp_code, ep_index);
>> +
>> +		ep_halt(xudc, ep_index);
>> +		break;
>> +	case TRB_CMPL_CODE_CTRL_SEQNUM_ERR:
>> +		dev_info(xudc->dev, "sequence number error\n");
>> +
>> +		/*
>> +		 * Kill any queued control request and skip to the last
>> +		 * setup packet we received.
>> +		 */
>> +		tegra_xudc_ep_nuke(ep, -EINVAL);
>> +		xudc->setup_state = WAIT_FOR_SETUP;
>> +		if (!xudc->queued_setup_packet)
>> +			break;
>> +
>> +		tegra_xudc_handle_ep0_setup_packet(xudc,
>> +						   &xudc->setup_packet.ctrl_req,
>> +						   xudc->setup_packet.seq_num);
>> +		xudc->queued_setup_packet = false;
>> +		break;
>> +	case TRB_CMPL_CODE_STOPPED:
>> +		dev_dbg(xudc->dev, "stop completion code on EP %u\n",
>> +			ep_index);
>> +
>> +		/* Disconnected. */
>> +		tegra_xudc_ep_nuke(ep, -ECONNREFUSED);
>> +		break;
>> +	default:
>> +		dev_dbg(xudc->dev, "completion event %#x on EP %u\n",
>> +			comp_code, ep_index);
>> +		break;
>> +	}
>> +}
>> +
>> +static void tegra_xudc_reset(struct tegra_xudc *xudc)
>> +{
>> +	struct tegra_xudc_ep *ep0 = &xudc->ep[0];
>> +	dma_addr_t deq_ptr;
>> +	unsigned int i;
>> +
>> +	xudc->setup_state = WAIT_FOR_SETUP;
>> +	xudc->device_state = USB_STATE_DEFAULT;
>> +	usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +	ep_unpause_all(xudc);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
>> +		tegra_xudc_ep_nuke(&xudc->ep[i], -ESHUTDOWN);
>> +
>> +	/*
>> +	 * Reset sequence number and dequeue pointer to flush the transfer
>> +	 * ring.
>> +	 */
>> +	ep0->deq_ptr = ep0->enq_ptr;
>> +	ep0->ring_full = false;
>> +
>> +	xudc->setup_seq_num = 0;
>> +	xudc->queued_setup_packet = false;
>> +
>> +	ep_ctx_write_seq_num(ep0->context, xudc->setup_seq_num);
>> +
>> +	deq_ptr = trb_virt_to_phys(ep0, &ep0->transfer_ring[ep0->deq_ptr]);
>> +
>> +	if (!dma_mapping_error(xudc->dev, deq_ptr)) {
>> +		ep_ctx_write_deq_ptr(ep0->context, deq_ptr);
>> +		ep_ctx_write_dcs(ep0->context, ep0->pcs);
>> +	}
>> +
>> +	ep_unhalt_all(xudc);
>> +	ep_reload(xudc, 0);
>> +	ep_unpause(xudc, 0);
>> +}
>> +
>> +static void tegra_xudc_port_connect(struct tegra_xudc *xudc)
>> +{
>> +	struct tegra_xudc_ep *ep0 = &xudc->ep[0];
>> +	u16 maxpacket;
>> +	u32 val;
>> +
>> +	val = (xudc_readl(xudc, PORTSC) >> PORTSC_PS_SHIFT) & PORTSC_PS_MASK;
>> +	switch (val) {
>> +	case PORTSC_PS_LS:
>> +		xudc->gadget.speed = USB_SPEED_LOW;
>> +		break;
>> +	case PORTSC_PS_FS:
>> +		xudc->gadget.speed = USB_SPEED_FULL;
>> +		break;
>> +	case PORTSC_PS_HS:
>> +		xudc->gadget.speed = USB_SPEED_HIGH;
>> +		break;
>> +	case PORTSC_PS_SS:
>> +		xudc->gadget.speed = USB_SPEED_SUPER;
>> +		break;
>> +	default:
>> +		xudc->gadget.speed = USB_SPEED_UNKNOWN;
>> +		break;
>> +	}
>> +
>> +	xudc->device_state = USB_STATE_DEFAULT;
>> +	usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +	xudc->setup_state = WAIT_FOR_SETUP;
>> +
>> +	if (xudc->gadget.speed == USB_SPEED_SUPER)
>> +		maxpacket = 512;
>> +	else
>> +		maxpacket = 64;
>> +
>> +	ep_ctx_write_max_packet_size(ep0->context, maxpacket);
>> +	tegra_xudc_ep0_desc.wMaxPacketSize = cpu_to_le16(maxpacket);
>> +	usb_ep_set_maxpacket_limit(&ep0->usb_ep, maxpacket);
>> +
>> +	if (!xudc->soc->u1_enable) {
>> +		val = xudc_readl(xudc, PORTPM);
>> +		val &= ~(PORTPM_U1TIMEOUT_MASK << PORTPM_U1TIMEOUT_SHIFT);
>> +		xudc_writel(xudc, val, PORTPM);
>> +	}
>> +
>> +	if (!xudc->soc->u2_enable) {
>> +		val = xudc_readl(xudc, PORTPM);
>> +		val &= ~(PORTPM_U2TIMEOUT_MASK << PORTPM_U2TIMEOUT_SHIFT);
>> +		xudc_writel(xudc, val, PORTPM);
>> +	}
>> +
>> +	if (xudc->gadget.speed <= USB_SPEED_HIGH) {
>> +		val = xudc_readl(xudc, PORTPM);
>> +		val &= ~(PORTPM_L1S_MASK << PORTPM_L1S_SHIFT);
>> +		if (xudc->soc->lpm_enable)
>> +			val |= PORTPM_L1S_ACCEPT << PORTPM_L1S_SHIFT;
>> +		else
>> +			val |= PORTPM_L1S_NYET << PORTPM_L1S_SHIFT;
>> +		xudc_writel(xudc, val, PORTPM);
>> +	}
>> +
>> +	val = xudc_readl(xudc, ST);
>> +	if (val & ST_RC)
>> +		xudc_writel(xudc, ST_RC, ST);
>> +}
>> +
>> +static void tegra_xudc_port_disconnect(struct tegra_xudc *xudc)
>> +{
>> +	tegra_xudc_reset(xudc);
>> +
>> +	if (xudc->driver && xudc->driver->disconnect) {
>> +		spin_unlock(&xudc->lock);
>> +		xudc->driver->disconnect(&xudc->gadget);
>> +		spin_lock(&xudc->lock);
>> +	}
>> +
>> +	xudc->device_state = USB_STATE_NOTATTACHED;
>> +	usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +	complete(&xudc->disconnect_complete);
>> +}
>> +
>> +static void tegra_xudc_port_reset(struct tegra_xudc *xudc)
>> +{
>> +	tegra_xudc_reset(xudc);
>> +
>> +	if (xudc->driver) {
>> +		spin_unlock(&xudc->lock);
>> +		usb_gadget_udc_reset(&xudc->gadget, xudc->driver);
>> +		spin_lock(&xudc->lock);
>> +	}
>> +
>> +	tegra_xudc_port_connect(xudc);
>> +}
>> +
>> +static void tegra_xudc_port_suspend(struct tegra_xudc *xudc)
>> +{
>> +	dev_dbg(xudc->dev, "port suspend\n");
>> +
>> +	xudc->resume_state = xudc->device_state;
>> +	xudc->device_state = USB_STATE_SUSPENDED;
>> +	usb_gadget_set_state(&xudc->gadget, xudc->device_state);
>> +
>> +	if (xudc->driver->suspend) {
>> +		spin_unlock(&xudc->lock);
>> +		xudc->driver->suspend(&xudc->gadget);
>> +		spin_lock(&xudc->lock);
>> +	}
>> +}
>> +
>> +static void tegra_xudc_port_resume(struct tegra_xudc *xudc)
>> +{
>> +	dev_dbg(xudc->dev, "port resume\n");
>> +
>> +	tegra_xudc_resume_device_state(xudc);
>> +
>> +	if (xudc->driver->resume) {
>> +		spin_unlock(&xudc->lock);
>> +		xudc->driver->resume(&xudc->gadget);
>> +		spin_lock(&xudc->lock);
>> +	}
>> +}
>> +
>> +static inline void clear_port_change(struct tegra_xudc *xudc, u32 flag)
>> +{
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, PORTSC);
>> +	val &= ~PORTSC_CHANGE_MASK;
>> +	val |= flag;
>> +	xudc_writel(xudc, val, PORTSC);
>> +}
>> +
>> +static void __tegra_xudc_handle_port_status(struct tegra_xudc *xudc)
>> +{
>> +	u32 portsc, porthalt;
>> +
>> +	porthalt = xudc_readl(xudc, PORTHALT);
>> +	if ((porthalt & PORTHALT_STCHG_REQ) &&
>> +	    (porthalt & PORTHALT_HALT_LTSSM)) {
>> +		dev_dbg(xudc->dev, "STCHG_REQ, PORTHALT = %#x\n", porthalt);
>> +		porthalt &= ~PORTHALT_HALT_LTSSM;
>> +		xudc_writel(xudc, porthalt, PORTHALT);
>> +	}
>> +
>> +	portsc = xudc_readl(xudc, PORTSC);
>> +	if ((portsc & PORTSC_PRC) && (portsc & PORTSC_PR)) {
>> +		dev_dbg(xudc->dev, "PRC, PR, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_PRC | PORTSC_PED);
>> +#define TOGGLE_VBUS_WAIT_MS 100
>> +		if (xudc->soc->port_reset_quirk) {
>> +			schedule_delayed_work(&xudc->port_reset_war_work,
>> +				msecs_to_jiffies(TOGGLE_VBUS_WAIT_MS));
>> +			xudc->wait_for_sec_prc = 1;
>> +		}
>> +	}
>> +
>> +	if ((portsc & PORTSC_PRC) && !(portsc & PORTSC_PR)) {
>> +		dev_dbg(xudc->dev, "PRC, Not PR, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_PRC | PORTSC_PED);
>> +		tegra_xudc_port_reset(xudc);
>> +		cancel_delayed_work(&xudc->port_reset_war_work);
>> +		xudc->wait_for_sec_prc = 0;
>> +	}
>> +
>> +	portsc = xudc_readl(xudc, PORTSC);
>> +	if (portsc & PORTSC_WRC) {
>> +		dev_dbg(xudc->dev, "WRC, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_WRC | PORTSC_PED);
>> +		if (!(xudc_readl(xudc, PORTSC) & PORTSC_WPR))
>> +			tegra_xudc_port_reset(xudc);
>> +	}
>> +
>> +	portsc = xudc_readl(xudc, PORTSC);
>> +	if (portsc & PORTSC_CSC) {
>> +		dev_dbg(xudc->dev, "CSC, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_CSC);
>> +
>> +		if (portsc & PORTSC_CCS)
>> +			tegra_xudc_port_connect(xudc);
>> +		else
>> +			tegra_xudc_port_disconnect(xudc);
>> +
>> +		if (xudc->wait_csc) {
>> +			cancel_delayed_work(&xudc->plc_reset_work);
>> +			xudc->wait_csc = false;
>> +		}
>> +	}
>> +
>> +	portsc = xudc_readl(xudc, PORTSC);
>> +	if (portsc & PORTSC_PLC) {
>> +		u32 pls = (portsc >> PORTSC_PLS_SHIFT) & PORTSC_PLS_MASK;
>> +
>> +		dev_dbg(xudc->dev, "PLC, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_PLC);
>> +		switch (pls) {
>> +		case PORTSC_PLS_U3:
>> +			tegra_xudc_port_suspend(xudc);
>> +			break;
>> +		case PORTSC_PLS_U0:
>> +			if (xudc->gadget.speed < USB_SPEED_SUPER)
>> +				tegra_xudc_port_resume(xudc);
>> +			break;
>> +		case PORTSC_PLS_RESUME:
>> +			if (xudc->gadget.speed == USB_SPEED_SUPER)
>> +				tegra_xudc_port_resume(xudc);
>> +			break;
>> +		case PORTSC_PLS_INACTIVE:
>> +			schedule_delayed_work(&xudc->plc_reset_work,
>> +					msecs_to_jiffies(TOGGLE_VBUS_WAIT_MS));
>> +			xudc->wait_csc = true;
>> +			break;
>> +		default:
>> +			break;
>> +		}
>> +	}
>> +
>> +	if (portsc & PORTSC_CEC) {
>> +		dev_warn(xudc->dev, "CEC, PORTSC = %#x\n", portsc);
>> +		clear_port_change(xudc, PORTSC_CEC);
>> +	}
>> +
>> +	dev_dbg(xudc->dev, "PORTSC = %#x\n", xudc_readl(xudc, PORTSC));
>> +}
>> +
>> +static void tegra_xudc_handle_port_status(struct tegra_xudc *xudc)
>> +{
>> +	while ((xudc_readl(xudc, PORTSC) & PORTSC_CHANGE_MASK) ||
>> +	       (xudc_readl(xudc, PORTHALT) & PORTHALT_STCHG_REQ))
>> +		__tegra_xudc_handle_port_status(xudc);
>> +}
>> +
>> +static void tegra_xudc_handle_event(struct tegra_xudc *xudc,
>> +				    struct tegra_xudc_trb *event)
>> +{
>> +	u32 type = trb_read_type(event);
>> +
>> +	dump_trb(xudc, "EVENT", event);
>> +
>> +	switch (type) {
>> +	case TRB_TYPE_PORT_STATUS_CHANGE_EVENT:
>> +		tegra_xudc_handle_port_status(xudc);
>> +		break;
>> +	case TRB_TYPE_TRANSFER_EVENT:
>> +		tegra_xudc_handle_transfer_event(xudc, event);
>> +		break;
>> +	case TRB_TYPE_SETUP_PACKET_EVENT:
>> +		tegra_xudc_handle_ep0_event(xudc, event);
>> +		break;
>> +	default:
>> +		dev_info(xudc->dev, "Unrecognized TRB type = %#x\n", type);
>> +		break;
>> +	}
>> +}
>> +
>> +static void tegra_xudc_process_event_ring(struct tegra_xudc *xudc)
>> +{
>> +	struct tegra_xudc_trb *event;
>> +	dma_addr_t erdp;
>> +
>> +	while (true) {
>> +		event = xudc->event_ring[xudc->event_ring_index] +
>> +			xudc->event_ring_deq_ptr;
>> +
>> +		if (trb_read_cycle(event) != xudc->ccs)
>> +			break;
>> +
>> +		tegra_xudc_handle_event(xudc, event);
>> +
>> +		xudc->event_ring_deq_ptr++;
>> +		if (xudc->event_ring_deq_ptr == XUDC_EVENT_RING_SIZE) {
>> +			xudc->event_ring_deq_ptr = 0;
>> +			xudc->event_ring_index++;
>> +		}
>> +
>> +		if (xudc->event_ring_index == XUDC_NR_EVENT_RINGS) {
>> +			xudc->event_ring_index = 0;
>> +			xudc->ccs = !xudc->ccs;
>> +		}
>> +	}
>> +
>> +	erdp = xudc->event_ring_phys[xudc->event_ring_index] +
>> +		xudc->event_ring_deq_ptr * sizeof(*event);
>> +
>> +	xudc_writel(xudc, upper_32_bits(erdp), ERDPHI);
>> +	xudc_writel(xudc, lower_32_bits(erdp) | ERDPLO_EHB, ERDPLO);
>> +}
>> +
>> +static irqreturn_t tegra_xudc_irq(int irq, void *data)
>> +{
>> +	struct tegra_xudc *xudc = data;
>> +	unsigned long flags;
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, ST);
>> +	if (!(val & ST_IP))
>> +		return IRQ_NONE;
>> +	xudc_writel(xudc, ST_IP, ST);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	tegra_xudc_process_event_ring(xudc);
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	return IRQ_HANDLED;
>> +}
>> +
>> +static int tegra_xudc_alloc_ep(struct tegra_xudc *xudc, unsigned int index)
>> +{
>> +	struct tegra_xudc_ep *ep = &xudc->ep[index];
>> +
>> +	ep->xudc = xudc;
>> +	ep->index = index;
>> +	ep->context = &xudc->ep_context[index];
>> +	INIT_LIST_HEAD(&ep->queue);
>> +
>> +	/*
>> +	 * EP1 would be the input endpoint corresponding to EP0, but since
>> +	 * EP0 is bi-directional, EP1 is unused.
>> +	 */
>> +	if (index == 1)
>> +		return 0;
>> +
>> +	ep->transfer_ring = dma_pool_alloc(xudc->transfer_ring_pool,
>> +					   GFP_KERNEL,
>> +					   &ep->transfer_ring_phys);
>> +	if (!ep->transfer_ring)
>> +		return -ENOMEM;
>> +
>> +	if (index) {
>> +		snprintf(ep->name, sizeof(ep->name), "ep%u%s", index / 2,
>> +			 (index % 2 == 0) ? "out" : "in");
>> +		ep->usb_ep.name = ep->name;
>> +		usb_ep_set_maxpacket_limit(&ep->usb_ep, 1024);
>> +		ep->usb_ep.max_streams = 16;
>> +		ep->usb_ep.ops = &tegra_xudc_ep_ops;
>> +		ep->usb_ep.caps.type_bulk = true;
>> +		ep->usb_ep.caps.type_int = true;
>> +		if (index & 1)
>> +			ep->usb_ep.caps.dir_in = true;
>> +		else
>> +			ep->usb_ep.caps.dir_out = true;
>> +		list_add_tail(&ep->usb_ep.ep_list, &xudc->gadget.ep_list);
>> +	} else {
>> +		strcpy(ep->name, "ep0");
>> +		ep->usb_ep.name = ep->name;
>> +		usb_ep_set_maxpacket_limit(&ep->usb_ep, 512);
>> +		ep->usb_ep.ops = &tegra_xudc_ep0_ops;
>> +		ep->usb_ep.caps.type_control = true;
>> +		ep->usb_ep.caps.dir_in = true;
>> +		ep->usb_ep.caps.dir_out = true;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void tegra_xudc_free_ep(struct tegra_xudc *xudc, unsigned int index)
>> +{
>> +	struct tegra_xudc_ep *ep = &xudc->ep[index];
>> +
>> +	/*
>> +	 * EP1 would be the input endpoint corresponding to EP0, but since
>> +	 * EP0 is bi-directional, EP1 is unused.
>> +	 */
>> +	if (index == 1)
>> +		return;
>> +
>> +	dma_pool_free(xudc->transfer_ring_pool, ep->transfer_ring,
>> +		      ep->transfer_ring_phys);
>> +}
>> +
>> +static int tegra_xudc_alloc_eps(struct tegra_xudc *xudc)
>> +{
>> +	struct usb_request *req;
>> +	unsigned int i;
>> +	int err;
>> +
>> +	xudc->ep_context =
>> +		dma_alloc_coherent(xudc->dev, XUDC_NR_EPS *
>> +				    sizeof(*xudc->ep_context),
>> +				    &xudc->ep_context_phys, GFP_KERNEL);
>> +	if (!xudc->ep_context)
>> +		return -ENOMEM;
>> +
>> +	xudc->transfer_ring_pool =
>> +		dmam_pool_create(dev_name(xudc->dev), xudc->dev,
>> +				 XUDC_TRANSFER_RING_SIZE *
>> +				 sizeof(struct tegra_xudc_trb),
>> +				 sizeof(struct tegra_xudc_trb), 0);
>> +	if (!xudc->transfer_ring_pool) {
>> +		err = -ENOMEM;
>> +		goto free_ep_context;
>> +	}
>> +
>> +	INIT_LIST_HEAD(&xudc->gadget.ep_list);
>> +	for (i = 0; i < ARRAY_SIZE(xudc->ep); i++) {
>> +		err = tegra_xudc_alloc_ep(xudc, i);
>> +		if (err < 0)
>> +			goto free_eps;
>> +	}
>> +
>> +	req = tegra_xudc_ep_alloc_request(&xudc->ep[0].usb_ep, GFP_KERNEL);
>> +	if (!req) {
>> +		err = -ENOMEM;
>> +		goto free_eps;
>> +	}
>> +	xudc->ep0_req = to_xudc_req(req);
>> +
>> +	return 0;
>> +
>> +free_eps:
>> +	for (; i > 0; i--)
>> +		tegra_xudc_free_ep(xudc, i - 1);
>> +free_ep_context:
>> +	dma_free_coherent(xudc->dev, XUDC_NR_EPS * sizeof(*xudc->ep_context),
>> +			  xudc->ep_context, xudc->ep_context_phys);
>> +	return err;
>> +}
>> +
>> +static void tegra_xudc_init_eps(struct tegra_xudc *xudc)
>> +{
>> +	xudc_writel(xudc, lower_32_bits(xudc->ep_context_phys), ECPLO);
>> +	xudc_writel(xudc, upper_32_bits(xudc->ep_context_phys), ECPHI);
>> +}
>> +
>> +static void tegra_xudc_free_eps(struct tegra_xudc *xudc)
>> +{
>> +	unsigned int i;
>> +
>> +	tegra_xudc_ep_free_request(&xudc->ep[0].usb_ep,
>> +				   &xudc->ep0_req->usb_req);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(xudc->ep); i++)
>> +		tegra_xudc_free_ep(xudc, i);
>> +
>> +	dma_free_coherent(xudc->dev, XUDC_NR_EPS * sizeof(*xudc->ep_context),
>> +			  xudc->ep_context, xudc->ep_context_phys);
>> +}
>> +
>> +static int tegra_xudc_alloc_event_ring(struct tegra_xudc *xudc)
>> +{
>> +	unsigned int i;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
>> +		xudc->event_ring[i] =
>> +			dma_alloc_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
>> +					   sizeof(*xudc->event_ring[i]),
>> +					   &xudc->event_ring_phys[i],
>> +					   GFP_KERNEL);
>> +		if (!xudc->event_ring[i])
>> +			goto free_dma;
>> +	}
>> +
>> +	return 0;
>> +
>> +free_dma:
>> +	for (; i > 0; i--) {
>> +		dma_free_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
>> +				  sizeof(*xudc->event_ring[i - 1]),
>> +				  xudc->event_ring[i - 1],
>> +				  xudc->event_ring_phys[i - 1]);
>> +	}
>> +	return -ENOMEM;
>> +}
>> +
>> +static void tegra_xudc_init_event_ring(struct tegra_xudc *xudc)
>> +{
>> +	unsigned int i;
>> +	u32 val;
>> +
>> +	val = xudc_readl(xudc, SPARAM);
>> +	val &= ~(SPARAM_ERSTMAX_MASK << SPARAM_ERSTMAX_SHIFT);
>> +	val |= XUDC_NR_EVENT_RINGS << SPARAM_ERSTMAX_SHIFT;
>> +	xudc_writel(xudc, val, SPARAM);
>> +
>> +	for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
>> +		memset(xudc->event_ring[i], 0, XUDC_EVENT_RING_SIZE *
>> +		       sizeof(*xudc->event_ring[i]));
>> +
>> +		val = xudc_readl(xudc, ERSTSZ);
>> +		val &= ~(ERSTSZ_ERSTXSZ_MASK << ERSTSZ_ERSTXSZ_SHIFT(i));
>> +		val |= XUDC_EVENT_RING_SIZE << ERSTSZ_ERSTXSZ_SHIFT(i);
>> +		xudc_writel(xudc, val, ERSTSZ);
>> +
>> +		xudc_writel(xudc, lower_32_bits(xudc->event_ring_phys[i]),
>> +			    ERSTXBALO(i));
>> +		xudc_writel(xudc, upper_32_bits(xudc->event_ring_phys[i]),
>> +			    ERSTXBAHI(i));
>> +	}
>> +
>> +	val = lower_32_bits(xudc->event_ring_phys[0]);
>> +	xudc_writel(xudc, val, ERDPLO);
>> +	val |= EREPLO_ECS;
>> +	xudc_writel(xudc, val, EREPLO);
>> +
>> +	val = upper_32_bits(xudc->event_ring_phys[0]);
>> +	xudc_writel(xudc, val, ERDPHI);
>> +	xudc_writel(xudc, val, EREPHI);
>> +
>> +	xudc->ccs = true;
>> +	xudc->event_ring_index = 0;
>> +	xudc->event_ring_deq_ptr = 0;
>> +}
>> +
>> +static void tegra_xudc_free_event_ring(struct tegra_xudc *xudc)
>> +{
>> +	unsigned int i;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(xudc->event_ring); i++) {
>> +		dma_free_coherent(xudc->dev, XUDC_EVENT_RING_SIZE *
>> +				  sizeof(*xudc->event_ring[i]),
>> +				  xudc->event_ring[i],
>> +				  xudc->event_ring_phys[i]);
>> +	}
>> +}
>> +
>> +static void tegra_xudc_fpci_ipfs_init(struct tegra_xudc *xudc)
>> +{
>> +	u32 val;
>> +
>> +	if (xudc->soc->has_ipfs) {
>> +		val = ipfs_readl(xudc, XUSB_DEV_CONFIGURATION_0);
>> +		val |= XUSB_DEV_CONFIGURATION_0_EN_FPCI;
>> +		ipfs_writel(xudc, val, XUSB_DEV_CONFIGURATION_0);
>> +		udelay(10);
>> +	}
>> +
>> +	/* Enable bus master */
>> +	val = XUSB_DEV_CFG_1_IO_SPACE_EN | XUSB_DEV_CFG_1_MEMORY_SPACE_EN |
>> +		XUSB_DEV_CFG_1_BUS_MASTER_EN;
>> +	fpci_writel(xudc, val, XUSB_DEV_CFG_1);
>> +
>> +	/* Program BAR0 space */
>> +	val = fpci_readl(xudc, XUSB_DEV_CFG_4);
>> +	val &= ~(XUSB_DEV_CFG_4_BASE_ADDR_MASK <<
>> +		 XUSB_DEV_CFG_4_BASE_ADDR_SHIFT);
>> +	val |= xudc->phys_base & (XUSB_DEV_CFG_4_BASE_ADDR_MASK <<
>> +				  XUSB_DEV_CFG_4_BASE_ADDR_SHIFT);
>> +
>> +	fpci_writel(xudc, val, XUSB_DEV_CFG_4);
>> +	fpci_writel(xudc, upper_32_bits(xudc->phys_base), XUSB_DEV_CFG_5);
>> +
>> +	usleep_range(100, 200);
>> +
>> +	if (xudc->soc->has_ipfs) {
>> +		/* Enable interrupt assertion */
>> +		val = ipfs_readl(xudc, XUSB_DEV_INTR_MASK_0);
>> +		val |= XUSB_DEV_INTR_MASK_0_IP_INT_MASK;
>> +		ipfs_writel(xudc, val, XUSB_DEV_INTR_MASK_0);
>> +	}
>> +}
>> +
>> +static void tegra_xudc_device_params_init(struct tegra_xudc *xudc)
>> +{
>> +	u32 val, imod;
>> +
>> +	if (xudc->soc->has_ipfs) {
>> +		val = xudc_readl(xudc, BLCG);
>> +		val |= BLCG_ALL;
>> +		val &= ~(BLCG_DFPCI | BLCG_UFPCI | BLCG_FE |
>> +				BLCG_COREPLL_PWRDN);
>> +		val |= BLCG_IOPLL_0_PWRDN;
>> +		val |= BLCG_IOPLL_1_PWRDN;
>> +		val |= BLCG_IOPLL_2_PWRDN;
>> +
>> +		xudc_writel(xudc, val, BLCG);
>> +	}
>> +
>> +	/* Set a reasonable U3 exit timer value. */
>> +	val = xudc_readl(xudc, SSPX_CORE_PADCTL4);
>> +	val &= ~(SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_MASK <<
>> +		 SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_SHIFT);
>> +	val |= 0x5dc0 << SSPX_CORE_PADCTL4_RXDAT_VLD_TIMEOUT_U3_SHIFT;
>> +	xudc_writel(xudc, val, SSPX_CORE_PADCTL4);
>> +
>> +	/* Default ping LFPS tBurst is too large. */
>> +	val = xudc_readl(xudc, SSPX_CORE_CNT0);
>> +	val &= ~(SSPX_CORE_CNT0_PING_TBURST_MASK <<
>> +		 SSPX_CORE_CNT0_PING_TBURST_SHIFT);
>> +	val |= 0xa << SSPX_CORE_CNT0_PING_TBURST_SHIFT;
>> +	xudc_writel(xudc, val, SSPX_CORE_CNT0);
>> +
>> +	/* Default tPortConfiguration timeout is too small. */
>> +	val = xudc_readl(xudc, SSPX_CORE_CNT30);
>> +	val &= ~(SSPX_CORE_CNT30_LMPITP_TIMER_MASK <<
>> +		 SSPX_CORE_CNT30_LMPITP_TIMER_SHIFT);
>> +	val |= 0x978 << SSPX_CORE_CNT30_LMPITP_TIMER_SHIFT;
>> +	xudc_writel(xudc, val, SSPX_CORE_CNT30);
>> +
>> +	if (xudc->soc->lpm_enable) {
>> +		/* Set L1 resume duration to 95 us. */
>> +		val = xudc_readl(xudc, HSFSPI_COUNT13);
>> +		val &= ~(HSFSPI_COUNT13_U2_RESUME_K_DURATION_MASK <<
>> +				HSFSPI_COUNT13_U2_RESUME_K_DURATION_SHIFT);
>> +		val |= 0x2c88 << HSFSPI_COUNT13_U2_RESUME_K_DURATION_SHIFT;
>> +		xudc_writel(xudc, val, HSFSPI_COUNT13);
>> +	}
>> +
>> +	/*
>> +	 * Compliacne suite appears to be violating polling LFPS tBurst max
>> +	 * of 1.4us.  Send 1.45us instead.
>> +	 */
>> +	val = xudc_readl(xudc, SSPX_CORE_CNT32);
>> +	val &= ~(SSPX_CORE_CNT32_POLL_TBURST_MAX_MASK <<
>> +		 SSPX_CORE_CNT32_POLL_TBURST_MAX_SHIFT);
>> +	val |= 0xb0 << SSPX_CORE_CNT32_POLL_TBURST_MAX_SHIFT;
>> +	xudc_writel(xudc, val, SSPX_CORE_CNT32);
>> +
>> +	/* Direct HS/FS port instance to RxDetect. */
>> +	val = xudc_readl(xudc, CFG_DEV_FE);
>> +	val &= ~(CFG_DEV_FE_PORTREGSEL_MASK << CFG_DEV_FE_PORTREGSEL_SHIFT);
>> +	val |= CFG_DEV_FE_PORTREGSEL_HSFS_PI << CFG_DEV_FE_PORTREGSEL_SHIFT;
>> +	xudc_writel(xudc, val, CFG_DEV_FE);
>> +
>> +	val = xudc_readl(xudc, PORTSC);
>> +	val &= ~(PORTSC_CHANGE_MASK | (PORTSC_PLS_MASK << PORTSC_PLS_SHIFT));
>> +	val |= PORTSC_LWS | (PORTSC_PLS_RXDETECT << PORTSC_PLS_SHIFT);
>> +	xudc_writel(xudc, val, PORTSC);
>> +
>> +	/* Direct SS port instance to RxDetect. */
>> +	val = xudc_readl(xudc, CFG_DEV_FE);
>> +	val &= ~(CFG_DEV_FE_PORTREGSEL_MASK << CFG_DEV_FE_PORTREGSEL_SHIFT);
>> +	val |= CFG_DEV_FE_PORTREGSEL_SS_PI << CFG_DEV_FE_PORTREGSEL_SHIFT;
>> +	xudc_writel(xudc, val, CFG_DEV_FE);
>> +
>> +	val = xudc_readl(xudc, PORTSC);
>> +	val &= ~(PORTSC_CHANGE_MASK | (PORTSC_PLS_MASK << PORTSC_PLS_SHIFT));
>> +	val |= PORTSC_LWS | (PORTSC_PLS_RXDETECT << PORTSC_PLS_SHIFT);
>> +	xudc_writel(xudc, val, PORTSC);
>> +
>> +	/* Restore port instance. */
>> +	val = xudc_readl(xudc, CFG_DEV_FE);
>> +	val &= ~(CFG_DEV_FE_PORTREGSEL_MASK << CFG_DEV_FE_PORTREGSEL_SHIFT);
>> +	xudc_writel(xudc, val, CFG_DEV_FE);
>> +
>> +	/*
>> +	 * Enable INFINITE_SS_RETRY to prevent device from entering
>> +	 * Disabled.Error when attached to buggy SuperSpeed hubs.
>> +	 */
>> +	val = xudc_readl(xudc, CFG_DEV_FE);
>> +	val |= CFG_DEV_FE_INFINITE_SS_RETRY;
>> +	xudc_writel(xudc, val, CFG_DEV_FE);
>> +
>> +	/* Set interrupt moderation. */
>> +	imod = XUDC_INTERRUPT_MODERATION_US * 4;
>> +	val = xudc_readl(xudc, RT_IMOD);
>> +	val &= ~((RT_IMOD_IMODI_MASK << RT_IMOD_IMODI_SHIFT) |
>> +		 (RT_IMOD_IMODC_MASK << RT_IMOD_IMODC_SHIFT));
>> +	val |= (imod << RT_IMOD_IMODI_SHIFT) | (imod << RT_IMOD_IMODC_SHIFT);
>> +	xudc_writel(xudc, val, RT_IMOD);
>> +
>> +	/* increase SSPI transaction timeout from 32us to 512us */
>> +	val = xudc_readl(xudc, CFG_DEV_SSPI_XFER);
>> +	val &= ~(CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK <<
>> +		CFG_DEV_SSPI_XFER_ACKTIMEOUT_SHIFT);
>> +	val |= (0xf000 & CFG_DEV_SSPI_XFER_ACKTIMEOUT_MASK) <<
>> +		CFG_DEV_SSPI_XFER_ACKTIMEOUT_SHIFT;
>> +	xudc_writel(xudc, val, CFG_DEV_SSPI_XFER);
>> +}
>> +
>> +static int tegra_xudc_phy_init(struct tegra_xudc *xudc)
>> +{
>> +	int err;
>> +
>> +	err = phy_init(xudc->utmi_phy);
>> +	if (err < 0) {
>> +		dev_err(xudc->dev, "utmi phy init failed: %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	err = phy_init(xudc->usb3_phy);
>> +	if (err < 0) {
>> +		dev_err(xudc->dev, "usb3 phy init failed: %d\n", err);
>> +		goto exit_utmi_phy;
>> +	}
>> +
>> +	return 0;
>> +
>> +exit_utmi_phy:
>> +	phy_exit(xudc->utmi_phy);
>> +	return err;
>> +}
>> +
>> +static void tegra_xudc_phy_exit(struct tegra_xudc *xudc)
>> +{
>> +	phy_exit(xudc->usb3_phy);
>> +	phy_exit(xudc->utmi_phy);
>> +}
>> +
>> +static const char * const tegra210_xudc_supply_names[] = {
>> +	"hvdd-usb",
>> +	"avddio-usb",
>> +};
>> +
>> +static const char * const tegra210_xudc_clock_names[] = {
>> +	"dev",
>> +	"ss",
>> +	"ss_src",
>> +	"hs_src",
>> +	"fs_src",
>> +};
>> +
>> +static struct tegra_xudc_soc tegra210_xudc_soc_data = {
>> +	.supply_names = tegra210_xudc_supply_names,
>> +	.num_supplies = ARRAY_SIZE(tegra210_xudc_supply_names),
>> +	.clock_names = tegra210_xudc_clock_names,
>> +	.num_clks = ARRAY_SIZE(tegra210_xudc_clock_names),
>> +	.u1_enable = false,
>> +	.u2_enable = true,
>> +	.lpm_enable = false,
>> +	.invalid_seq_num = true,
>> +	.pls_quirk = true,
>> +	.port_reset_quirk = true,
>> +	.has_ipfs = true,
>> +};
>> +
>> +static const struct of_device_id tegra_xudc_of_match[] = {
>> +	{
>> +		.compatible = "nvidia,tegra210-xudc",
>> +		.data = &tegra210_xudc_soc_data
>> +	},
>> +	{ }
>> +};
>> +MODULE_DEVICE_TABLE(of, tegra_xudc_of_match);
>> +
>> +static void tegra_xudc_powerdomain_remove(struct tegra_xudc *xudc)
>> +{
>> +	if (xudc->genpd_dl_ss)
>> +		device_link_del(xudc->genpd_dl_ss);
>> +	if (xudc->genpd_dl_device)
>> +		device_link_del(xudc->genpd_dl_device);
>> +	if (xudc->genpd_dev_ss)
>> +		dev_pm_domain_detach(xudc->genpd_dev_ss, true);
>> +	if (xudc->genpd_dev_device)
>> +		dev_pm_domain_detach(xudc->genpd_dev_device, true);
>> +}
>> +
>> +static int tegra_xudc_powerdomain_init(struct tegra_xudc *xudc)
>> +{
>> +	struct device *dev = xudc->dev;
>> +	int err;
>> +
>> +	xudc->genpd_dev_device = dev_pm_domain_attach_by_name(dev,
>> +								"dev");
>> +	if (IS_ERR(xudc->genpd_dev_device)) {
>> +		err = PTR_ERR(xudc->genpd_dev_device);
>> +		dev_err(dev, "failed to get dev pm-domain: %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	xudc->genpd_dev_ss = dev_pm_domain_attach_by_name(dev, "ss");
>> +	if (IS_ERR(xudc->genpd_dev_ss)) {
>> +		err = PTR_ERR(xudc->genpd_dev_ss);
>> +		dev_err(dev, "failed to get superspeed pm-domain: %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	xudc->genpd_dl_device = device_link_add(dev, xudc->genpd_dev_device,
>> +					       DL_FLAG_PM_RUNTIME |
>> +					       DL_FLAG_STATELESS);
>> +	if (!xudc->genpd_dl_device) {
>> +		dev_err(dev, "adding usb device device link failed!\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	xudc->genpd_dl_ss = device_link_add(dev, xudc->genpd_dev_ss,
>> +					     DL_FLAG_PM_RUNTIME |
>> +					     DL_FLAG_STATELESS);
>> +	if (!xudc->genpd_dl_ss) {
>> +		dev_err(dev, "adding superspeed device link failed!\n");
>> +		return -ENODEV;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int tegra_xudc_probe(struct platform_device *pdev)
>> +{
>> +	struct tegra_xudc *xudc;
>> +	struct resource *res;
>> +	struct usb_role_switch_desc role_sx_desc = { 0 };
>> +	unsigned int i;
>> +	int err;
>> +
>> +	xudc = devm_kzalloc(&pdev->dev, sizeof(*xudc), GFP_ATOMIC);
>> +	if (!xudc)
>> +		return -ENOMEM;
>> +
>> +	xudc->dev = &pdev->dev;
>> +	platform_set_drvdata(pdev, xudc);
>> +
>> +	xudc->soc = of_device_get_match_data(&pdev->dev);
>> +	if (!xudc->soc)
>> +		return -ENODEV;
>> +
>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "base");
>> +	xudc->base = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(xudc->base))
>> +		return PTR_ERR(xudc->base);
>> +	xudc->phys_base = res->start;
>> +
>> +	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "fpci");
>> +	xudc->fpci = devm_ioremap_resource(&pdev->dev, res);
>> +	if (IS_ERR(xudc->fpci))
>> +		return PTR_ERR(xudc->fpci);
>> +
>> +	if (xudc->soc->has_ipfs) {
>> +		res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
>> +						   "ipfs");
>> +		xudc->ipfs = devm_ioremap_resource(&pdev->dev, res);
>> +		if (IS_ERR(xudc->ipfs))
>> +			return PTR_ERR(xudc->ipfs);
>> +	}
>> +
>> +	xudc->irq = platform_get_irq(pdev, 0);
>> +	if (xudc->irq < 0) {
>> +		dev_err(xudc->dev, "failed to get IRQ: %d\n",
>> +				xudc->irq);
>> +		return xudc->irq;
>> +	}
>> +
>> +	err = devm_request_irq(&pdev->dev, xudc->irq, tegra_xudc_irq, 0,
>> +			       dev_name(&pdev->dev), xudc);
>> +	if (err < 0) {
>> +		dev_err(xudc->dev, "failed to claim IRQ#%u: %d\n", xudc->irq,
>> +			err);
>> +		return err;
>> +	}
>> +
>> +	xudc->clks = devm_kcalloc(&pdev->dev, xudc->soc->num_clks,
>> +				      sizeof(*xudc->clks), GFP_KERNEL);
>> +	if (!xudc->clks)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < xudc->soc->num_clks; i++)
>> +		xudc->clks[i].id = xudc->soc->clock_names[i];
>> +
>> +	err = devm_clk_bulk_get(&pdev->dev, xudc->soc->num_clks,
>> +				      xudc->clks);
>> +	if (err) {
>> +		dev_err(xudc->dev, "failed to request clks %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	xudc->supplies = devm_kcalloc(&pdev->dev, xudc->soc->num_supplies,
>> +				      sizeof(*xudc->supplies), GFP_KERNEL);
>> +	if (!xudc->supplies)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < xudc->soc->num_supplies; i++)
>> +		xudc->supplies[i].supply = xudc->soc->supply_names[i];
>> +
>> +	err = devm_regulator_bulk_get(&pdev->dev, xudc->soc->num_supplies,
>> +				      xudc->supplies);
>> +	if (err) {
>> +		dev_err(xudc->dev, "failed to request regulators %d\n", err);
>> +		return err;
>> +	}
>> +
>> +	xudc->padctl = tegra_xusb_padctl_get(&pdev->dev);
>> +	if (IS_ERR(xudc->padctl))
>> +		return PTR_ERR(xudc->padctl);
>> +
>> +	err = regulator_bulk_enable(xudc->soc->num_supplies, xudc->supplies);
>> +	if (err) {
>> +		dev_err(xudc->dev, "failed to enable regulators %d\n", err);
>> +		goto put_padctl;
>> +	}
>> +
>> +	xudc->usb3_phy = devm_phy_optional_get(&pdev->dev, "usb3");
>> +	if (IS_ERR(xudc->usb3_phy)) {
>> +		err = PTR_ERR(xudc->usb3_phy);
>> +		dev_err(xudc->dev, "failed to get usb3 phy: %d\n", err);
>> +		goto disable_regulator;
>> +	}
>> +
>> +	xudc->utmi_phy = devm_phy_optional_get(&pdev->dev, "usb2");
>> +	if (IS_ERR(xudc->utmi_phy)) {
>> +		err = PTR_ERR(xudc->utmi_phy);
>> +		dev_err(xudc->dev, "failed to get usb2 phy: %d\n", err);
>> +		goto disable_regulator;
>> +	}
>> +
>> +	err = tegra_xudc_powerdomain_init(xudc);
>> +	if (err)
>> +		goto put_powerdomains;
>> +
>> +	err = tegra_xudc_phy_init(xudc);
>> +	if (err)
>> +		goto put_powerdomains;
>> +
>> +	err = tegra_xudc_alloc_event_ring(xudc);
>> +	if (err)
>> +		goto disable_phy;
>> +
>> +	err = tegra_xudc_alloc_eps(xudc);
>> +	if (err)
>> +		goto free_event_ring;
>> +
>> +	spin_lock_init(&xudc->lock);
>> +
>> +	init_completion(&xudc->disconnect_complete);
>> +
>> +	INIT_WORK(&xudc->usb_role_sw_work, tegra_xudc_usb_role_sw_work);
>> +
>> +	INIT_DELAYED_WORK(&xudc->plc_reset_work, tegra_xudc_plc_reset_work);
>> +
>> +	INIT_DELAYED_WORK(&xudc->port_reset_war_work,
>> +				tegra_xudc_port_reset_war_work);
>> +
>> +	if (of_property_read_bool(xudc->dev->of_node, "usb-role-switch")) {
>> +		role_sx_desc.set = tegra_xudc_usb_role_sw_set;
>> +		role_sx_desc.fwnode = dev_fwnode(xudc->dev);
>> +
>> +		xudc->usb_role_sw = usb_role_switch_register(xudc->dev,
>> +							&role_sx_desc);
>> +		if (IS_ERR(xudc->usb_role_sw)) {
>> +			err = PTR_ERR(xudc->usb_role_sw);
>> +			dev_err(xudc->dev, "Failed to register USB role SW: %d",
>> +					   err);
>> +			goto free_eps;
>> +		}
>> +	} else {
>> +		/* Set the mode as device mode and this keeps phy always ON */
>> +		dev_err(xudc->dev, "Set usb role to device mode always");
>> +		xudc->device_mode = USB_ROLE_DEVICE;
>> +		tegra_xudc_update_data_role(xudc);
>> +	}
>> +
>> +	pm_runtime_enable(&pdev->dev);
>> +
>> +	xudc->gadget.ops = &tegra_xudc_gadget_ops;
>> +	xudc->gadget.ep0 = &xudc->ep[0].usb_ep;
>> +	xudc->gadget.name = "tegra-xudc";
>> +	xudc->gadget.max_speed = USB_SPEED_SUPER;
>> +
>> +	err = usb_add_gadget_udc(&pdev->dev, &xudc->gadget);
>> +	if (err) {
>> +		dev_err(&pdev->dev, "failed to add USB gadget: %d\n", err);
>> +		goto free_eps;
>> +	}
>> +
>> +	return 0;
>> +
>> +free_eps:
>> +	tegra_xudc_free_eps(xudc);
>> +free_event_ring:
>> +	tegra_xudc_free_event_ring(xudc);
>> +disable_phy:
>> +	tegra_xudc_phy_exit(xudc);
>> +put_powerdomains:
>> +	tegra_xudc_powerdomain_remove(xudc);
>> +disable_regulator:
>> +	regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
>> +put_padctl:
>> +	tegra_xusb_padctl_put(xudc->padctl);
>> +
>> +	return err;
>> +}
>> +
>> +static int tegra_xudc_remove(struct platform_device *pdev)
>> +{
>> +	struct tegra_xudc *xudc = platform_get_drvdata(pdev);
>> +
>> +	pm_runtime_get_sync(xudc->dev);
>> +
>> +	cancel_delayed_work(&xudc->plc_reset_work);
>> +
>> +	if (xudc->usb_role_sw) {
>> +		usb_role_switch_unregister(xudc->usb_role_sw);
>> +		cancel_work_sync(&xudc->usb_role_sw_work);
>> +	}
>> +
>> +	usb_del_gadget_udc(&xudc->gadget);
>> +
>> +	tegra_xudc_free_eps(xudc);
>> +	tegra_xudc_free_event_ring(xudc);
>> +
>> +	tegra_xudc_powerdomain_remove(xudc);
>> +
>> +	regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
>> +
>> +	phy_power_off(xudc->utmi_phy);
>> +	phy_power_off(xudc->usb3_phy);
>> +
>> +	tegra_xudc_phy_exit(xudc);
>> +
>> +	pm_runtime_disable(xudc->dev);
>> +	pm_runtime_put(xudc->dev);
>> +
>> +	tegra_xusb_padctl_put(xudc->padctl);
>> +
>> +	return 0;
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_powergate(struct tegra_xudc *xudc)
>> +{
>> +	unsigned long flags;
>> +
>> +	dev_dbg(xudc->dev, "entering ELPG\n");
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +
>> +	xudc->powergated = true;
>> +	xudc->saved_regs.ctrl = xudc_readl(xudc, CTRL);
>> +	xudc->saved_regs.portpm = xudc_readl(xudc, PORTPM);
>> +	xudc_writel(xudc, 0, CTRL);
>> +
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	clk_bulk_disable_unprepare(xudc->soc->num_clks, xudc->clks);
>> +
>> +	regulator_bulk_disable(xudc->soc->num_supplies, xudc->supplies);
>> +
>> +	dev_dbg(xudc->dev, "entering ELPG done\n");
>> +	return 0;
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_unpowergate(struct tegra_xudc *xudc)
>> +{
>> +	unsigned long flags;
>> +	int err;
>> +
>> +	dev_dbg(xudc->dev, "exiting ELPG\n");
>> +
>> +	err = regulator_bulk_enable(xudc->soc->num_supplies,
>> +			xudc->supplies);
>> +	if (err < 0)
>> +		return err;
>> +
>> +	err = clk_bulk_prepare_enable(xudc->soc->num_clks, xudc->clks);
>> +	if (err < 0)
>> +		return err;
>> +
>> +	tegra_xudc_fpci_ipfs_init(xudc);
>> +
>> +	tegra_xudc_device_params_init(xudc);
>> +
>> +	tegra_xudc_init_event_ring(xudc);
>> +
>> +	tegra_xudc_init_eps(xudc);
>> +
>> +	xudc_writel(xudc, xudc->saved_regs.portpm, PORTPM);
>> +	xudc_writel(xudc, xudc->saved_regs.ctrl, CTRL);
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	xudc->powergated = false;
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	dev_dbg(xudc->dev, "exiting ELPG done\n");
>> +	return 0;
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_suspend(struct device *dev)
>> +{
>> +	struct tegra_xudc *xudc = dev_get_drvdata(dev);
>> +	unsigned long flags;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	xudc->suspended = true;
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	if (xudc->usb_role_sw)
>> +		flush_work(&xudc->usb_role_sw_work);
>> +
>> +	/* Forcibly disconnect before powergating. */
>> +	tegra_xudc_device_mode_off(xudc);
>> +
>> +	if (!pm_runtime_status_suspended(dev))
>> +		tegra_xudc_powergate(xudc);
>> +
>> +	pm_runtime_disable(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_resume(struct device *dev)
>> +{
>> +	struct tegra_xudc *xudc = dev_get_drvdata(dev);
>> +	unsigned long flags;
>> +	int err;
>> +
>> +	err = tegra_xudc_unpowergate(xudc);
>> +	if (err < 0)
>> +		return err;
>> +
>> +	spin_lock_irqsave(&xudc->lock, flags);
>> +	xudc->suspended = false;
>> +	spin_unlock_irqrestore(&xudc->lock, flags);
>> +
>> +	tegra_xudc_update_data_role(xudc);
>> +
>> +	pm_runtime_enable(dev);
>> +
>> +	return 0;
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_runtime_suspend(struct device *dev)
>> +{
>> +	struct tegra_xudc *xudc = dev_get_drvdata(dev);
>> +
>> +	return tegra_xudc_powergate(xudc);
>> +}
>> +
>> +static int __maybe_unused tegra_xudc_runtime_resume(struct device *dev)
>> +{
>> +	struct tegra_xudc *xudc = dev_get_drvdata(dev);
>> +
>> +	return tegra_xudc_unpowergate(xudc);
>> +}
>> +
>> +static const struct dev_pm_ops tegra_xudc_pm_ops = {
>> +	SET_SYSTEM_SLEEP_PM_OPS(tegra_xudc_suspend, tegra_xudc_resume)
>> +	SET_RUNTIME_PM_OPS(tegra_xudc_runtime_suspend,
>> +			   tegra_xudc_runtime_resume, NULL)
>> +};
>> +
>> +static struct platform_driver tegra_xudc_driver = {
>> +	.probe = tegra_xudc_probe,
>> +	.remove = tegra_xudc_remove,
>> +	.driver = {
>> +		.name = "tegra-xudc",
>> +		.pm = &tegra_xudc_pm_ops,
>> +		.of_match_table = tegra_xudc_of_match,
>> +	},
>> +};
>> +module_platform_driver(tegra_xudc_driver);
>> +
>> +MODULE_DESCRIPTION("NVIDIA Tegra XUSB Device Controller");
>> +MODULE_AUTHOR("Andrew Bresticker <abrestic@chromium.org>");
>> +MODULE_AUTHOR("Hui Fu");
> email address?
>
Will update

Thanks,
Nagarjuna
 
>> +MODULE_AUTHOR("Nagarjuna Kristam <nkristam@nvidia.com>");
>> +MODULE_LICENSE("GPL v2");
> 
>