From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7E365C433E3 for ; Fri, 14 Aug 2020 05:45:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4D9AB206A4 for ; Fri, 14 Aug 2020 05:45:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726320AbgHNFpc (ORCPT ); Fri, 14 Aug 2020 01:45:32 -0400 Received: from mga12.intel.com ([192.55.52.136]:5764 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726006AbgHNFpc (ORCPT ); Fri, 14 Aug 2020 01:45:32 -0400 IronPort-SDR: 7cX/+aqypdMhVW8D2dqWJf91M/vtFoPkoe+HMDjWBhpfxK4QPP502FS6oGZUZwudeMqRpaon6s KAQw8jmPwLZw== X-IronPort-AV: E=McAfee;i="6000,8403,9712"; a="133881722" X-IronPort-AV: E=Sophos;i="5.76,311,1592895600"; d="scan'208";a="133881722" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga002.fm.intel.com ([10.253.24.26]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Aug 2020 22:26:27 -0700 IronPort-SDR: 4phNrNnArCy6KoqNCUj1xgjg2uuS6DBjOcj4Zw2YX9EWmsNcbT7EWCvLyiNlCH0yxGVgSX8wos 4D20CfcwuB6g== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,311,1592895600"; d="scan'208";a="327786701" Received: from sgsxdev004.isng.intel.com (HELO localhost) ([10.226.88.13]) by fmsmga002.fm.intel.com with ESMTP; 13 Aug 2020 22:26:24 -0700 From: Amireddy Mallikarjuna reddy To: dmaengine@vger.kernel.org, vkoul@kernel.org, devicetree@vger.kernel.org, robh+dt@kernel.org Cc: linux-kernel@vger.kernel.org, andriy.shevchenko@intel.com, cheol.yong.kim@intel.com, qi-ming.wu@intel.com, chuanhua.lei@linux.intel.com, mallikarjunax.reddy@linux.intel.com, malliamireddy009@gmail.com Subject: [PATCH v5 2/2] Add Intel LGM soc DMA support. Date: Fri, 14 Aug 2020 13:26:10 +0800 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add DMA controller driver for Lightning Mountain(LGM) family of SoCs. The main function of the DMA controller is the transfer of data from/to any DPlus compliant peripheral to/from the memory. A memory to memory copy capability can also be configured. This ldma driver is used for configure the device and channnels for data and control paths. Signed-off-by: Amireddy Mallikarjuna reddy --- v1: - Initial version. v2: - Fix device tree bot issues, correspondign driver changes done. - Fix kerntel test robot warnings. -------------------------------------------------------- >> drivers/dma/lgm/lgm-dma.c:729:5: warning: no previous prototype for function 'intel_dma_chan_desc_cfg' [-Wmissing-prototypes] int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, ^ drivers/dma/lgm/lgm-dma.c:729:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, ^ static 1 warning generated. vim +/intel_dma_chan_desc_cfg +729 drivers/dma/lgm/lgm-dma.c 728 > 729 int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, 730 int desc_num) 731 { 732 return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base, desc_num); 733 } 734 EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg); 735 Reported-by: kernel test robot --------------------------------------------------------------- v3: - Fix smatch warning. ---------------------------------------------------------------- smatch warnings: drivers/dma/lgm/lgm-dma.c:1306 ldma_cfg_init() error: uninitialized symbol 'ret'. Reported-by: kernel test robot Reported-by: Dan Carpenter ---------------------------------------------------------------- v4: - Address Thomas Langer comments in dtbinding and corresponding driver side changes. - Driver side changes to corresponding device tree changes. v5: - Add changes to read 'dmas' properties and update the config properties driver side. - Add virt_dma_desc utilizes virt-dma API. --- drivers/dma/Kconfig | 2 + drivers/dma/Makefile | 1 + drivers/dma/lgm/Kconfig | 9 + drivers/dma/lgm/Makefile | 2 + drivers/dma/lgm/lgm-dma.c | 1944 +++++++++++++++++++++++++++++++++++++++++++ include/linux/dma/lgm_dma.h | 27 + 6 files changed, 1985 insertions(+) create mode 100644 drivers/dma/lgm/Kconfig create mode 100644 drivers/dma/lgm/Makefile create mode 100644 drivers/dma/lgm/lgm-dma.c create mode 100644 include/linux/dma/lgm_dma.h diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index de41d7928bff..caeaf12fd524 100644 --- a/drivers/dma/Kconfig +++ b/drivers/dma/Kconfig @@ -737,6 +737,8 @@ source "drivers/dma/ti/Kconfig" source "drivers/dma/fsl-dpaa2-qdma/Kconfig" +source "drivers/dma/lgm/Kconfig" + # clients comment "DMA Clients" depends on DMA_ENGINE diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index e60f81331d4c..0b899b076f4e 100644 --- a/drivers/dma/Makefile +++ b/drivers/dma/Makefile @@ -83,6 +83,7 @@ obj-$(CONFIG_XGENE_DMA) += xgene-dma.o obj-$(CONFIG_ZX_DMA) += zx_dma.o obj-$(CONFIG_ST_FDMA) += st_fdma.o obj-$(CONFIG_FSL_DPAA2_QDMA) += fsl-dpaa2-qdma/ +obj-$(CONFIG_INTEL_LDMA) += lgm/ obj-y += mediatek/ obj-y += qcom/ diff --git a/drivers/dma/lgm/Kconfig b/drivers/dma/lgm/Kconfig new file mode 100644 index 000000000000..bdb5b0d91afb --- /dev/null +++ b/drivers/dma/lgm/Kconfig @@ -0,0 +1,9 @@ +# SPDX-License-Identifier: GPL-2.0-only +config INTEL_LDMA + bool "Lightning Mountain centralized low speed DMA and high speed DMA controllers" + select DMA_ENGINE + select DMA_VIRTUAL_CHANNELS + help + Enable support for intel Lightning Mountain SOC DMA controllers. + These controllers provide DMA capabilities for a variety of on-chip + devices such as SSC, HSNAND and GSWIP. diff --git a/drivers/dma/lgm/Makefile b/drivers/dma/lgm/Makefile new file mode 100644 index 000000000000..f318a8eff464 --- /dev/null +++ b/drivers/dma/lgm/Makefile @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0 +obj-$(CONFIG_INTEL_LDMA) += lgm-dma.o diff --git a/drivers/dma/lgm/lgm-dma.c b/drivers/dma/lgm/lgm-dma.c new file mode 100644 index 000000000000..4bd6ef9a2656 --- /dev/null +++ b/drivers/dma/lgm/lgm-dma.c @@ -0,0 +1,1944 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Lightning Mountain centralized low speed and high speed DMA controller driver + * + * Copyright (c) 2016 ~ 2020 Intel Corporation. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "../dmaengine.h" +#include "../virt-dma.h" + +#define DRIVER_NAME "lgm-ldma" + +#define DMA_ID 0x0008 +#define DMA_ID_REV GENMASK(7, 0) +#define DMA_ID_PNR GENMASK(19, 16) +#define DMA_ID_CHNR GENMASK(26, 20) +#define DMA_ID_DW_128B BIT(27) +#define DMA_ID_AW_36B BIT(28) +#define DMA_VER32 0x32 +#define DMA_VER31 0x31 +#define DMA_VER22 0x0A + +#define DMA_CTRL 0x0010 +#define DMA_CTRL_RST BIT(0) +#define DMA_CTRL_DSRAM_PATH BIT(1) +#define DMA_CTRL_DBURST_WR BIT(3) +#define DMA_CTRL_VLD_DF_ACK BIT(4) +#define DMA_CTRL_CH_FL BIT(6) +#define DMA_CTRL_DS_FOD BIT(7) +#define DMA_CTRL_DRB BIT(8) +#define DMA_CTRL_ENBE BIT(9) +#define DMA_CTRL_DESC_TMOUT_CNT_V31 GENMASK(27, 16) +#define DMA_CTRL_DESC_TMOUT_EN_V31 BIT(30) +#define DMA_CTRL_PKTARB BIT(31) + +#define DMA_CPOLL 0x0014 +#define DMA_CPOLL_CNT GENMASK(15, 4) +#define DMA_CPOLL_EN BIT(31) + +#define DMA_CS 0x0018 +#define DMA_CS_MASK GENMASK(5, 0) + +#define DMA_CCTRL 0x001C +#define DMA_CCTRL_ON BIT(0) +#define DMA_CCTRL_RST BIT(1) +#define DMA_CCTRL_CH_POLL_EN BIT(2) +#define DMA_CCTRL_CH_ABC BIT(3) /* Adaptive Burst Chop */ +#define DMA_CDBA_MSB GENMASK(7, 4) +#define DMA_CCTRL_DIR_TX BIT(8) +#define DMA_CCTRL_CLASS GENMASK(11, 9) +#define DMA_CCTRL_CLASSH GENMASK(19, 18) +#define DMA_CCTRL_WR_NP_EN BIT(21) +#define DMA_CCTRL_PDEN BIT(23) +#define DMA_MAX_CLASS (SZ_32 - 1) + +#define DMA_CDBA 0x0020 +#define DMA_CDLEN 0x0024 +#define DMA_CIS 0x0028 +#define DMA_CIE 0x002C +#define DMA_CI_EOP BIT(1) +#define DMA_CI_DUR BIT(2) +#define DMA_CI_DESCPT BIT(3) +#define DMA_CI_CHOFF BIT(4) +#define DMA_CI_RDERR BIT(5) +#define DMA_CI_ALL \ + (DMA_CI_EOP | DMA_CI_DUR | DMA_CI_DESCPT | DMA_CI_CHOFF | DMA_CI_RDERR) + +#define DMA_PS 0x0040 +#define DMA_PCTRL 0x0044 +#define DMA_PCTRL_RXBL16 BIT(0) +#define DMA_PCTRL_TXBL16 BIT(1) +#define DMA_PCTRL_RXBL GENMASK(3, 2) +#define DMA_PCTRL_RXBL_8 3 +#define DMA_PCTRL_TXBL GENMASK(5, 4) +#define DMA_PCTRL_TXBL_8 3 +#define DMA_PCTRL_PDEN BIT(6) +#define DMA_PCTRL_RXBL32 BIT(7) +#define DMA_PCTRL_RXENDI GENMASK(9, 8) +#define DMA_PCTRL_TXENDI GENMASK(11, 10) +#define DMA_PCTRL_TXBL32 BIT(15) +#define DMA_PCTRL_MEM_FLUSH BIT(16) + +#define DMA_IRNEN1 0x00E8 +#define DMA_IRNCR1 0x00EC +#define DMA_IRNEN 0x00F4 +#define DMA_IRNCR 0x00F8 +#define DMA_C_DP_TICK 0x100 +#define DMA_C_DP_TICK_TIKNARB GENMASK(15, 0) +#define DMA_C_DP_TICK_TIKARB GENMASK(31, 16) + +#define DMA_C_HDRM 0x110 +/* + * If header mode is set in DMA descriptor, + * If bit 30 is disabled, HDR_LEN must be configured according to channel + * requirement. + * If bit 30 is enabled(checksum with heade mode), HDR_LEN has no need to + * be configured. It will enable check sum for switch + * If header mode is not set in DMA descriptor, + * This register setting doesn't matter + */ +#define DMA_C_HDRM_HDR_SUM BIT(30) + +#define DMA_C_BOFF 0x120 +#define DMA_C_BOFF_BOF_LEN GENMASK(7, 0) +#define DMA_C_BOFF_EN BIT(31) + +#define DMA_ORRC 0x190 +#define DMA_ORRC_ORRCNT GENMASK(8, 4) +#define DMA_ORRC_EN BIT(31) + +#define DMA_C_ENDIAN 0x200 +#define DMA_C_END_DATAENDI GENMASK(1, 0) +#define DMA_C_END_DE_EN BIT(7) +#define DMA_C_END_DESENDI GENMASK(9, 8) +#define DMA_C_END_DES_EN BIT(16) + +/* DMA controller capability */ +#define DMA_ADDR_36BIT BIT(0) +#define DMA_DATA_128BIT BIT(1) +#define DMA_CHAN_FLOW_CTL BIT(2) +#define DMA_DESC_FTOD BIT(3) +#define DMA_DESC_IN_SRAM BIT(4) +#define DMA_EN_BYTE_EN BIT(5) +#define DMA_DBURST_WR BIT(6) +#define DMA_VLD_FETCH_ACK BIT(7) +#define DMA_DFT_DRB BIT(8) + +#define DMA_ORRC_MAX_CNT (SZ_32 - 1) +#define DMA_DFT_POLL_CNT SZ_4 + +#define DMA_DFT_BURST_V22 2 +#define DMA_BURSTL_8DW 8 +#define DMA_BURSTL_16DW 16 +#define DMA_BURSTL_32DW 32 +#define DMA_DFT_BURST DMA_BURSTL_16DW + +#define DMA_MAX_DESC_NUM (SZ_8K - 1) +#define DMA_MAX_PKT_SZ (SZ_16K - 1) +#define DMA_PKT_SZ_DFT SZ_2K +#define DMA_CHAN_BOFF_MAX (SZ_256 - 1) + +#define DMA_DFT_ENDIAN DMA_ENDIAN_TYPE0 +#define DMA_ENDIAN_MAX DMA_ENDIAN_TYPE3 + +#define DMA_DFT_DESC_TCNT 50 +#define DMA_HDR_LEN_MAX (SZ_16K - 1) + +/* DMA flags */ +#define DMA_TX_CH BIT(0) +#define DMA_RX_CH BIT(1) +#define DEVICE_ALLOC_DESC BIT(2) +#define CHAN_IN_USE BIT(3) +#define DMA_HW_DESC BIT(4) + +#define DMA_CHAN_RST 1 +#define DMA_TX_PORT_DFT_WGT 1 +#define DMA_DFT_DESC_NUM 1 +#define DMA_MAX_SIZE (BIT(16) - 1) +#define MAX_LOWER_CHANS 32 +#define MASK_LOWER_CHANS GENMASK(4, 0) +#define DMA_OWN 1 + +enum ldma_chan_on_off { + DMA_CH_OFF = 0, + DMA_CH_ON = 1, +}; + +enum ldma_pkt_drop { + DMA_PKT_DROP_DIS = 0, + DMA_PKT_DROP_EN, +}; + +enum ldma_endian { + DMA_ENDIAN_TYPE0 = 0, + DMA_ENDIAN_TYPE1, + DMA_ENDIAN_TYPE2, + DMA_ENDIAN_TYPE3, +}; + +enum { + DMA_TYPE_TX = 0, + DMA_TYPE_RX, + DMA_TYPE_MCPY, +}; + +struct ldma_dev; +struct ldma_port; +struct ldma_chan { + struct ldma_port *port; /* back pointer */ + char name[8]; /* Channel name */ + struct virt_dma_chan vchan; + int nr; /* Channel id in hardware */ + u32 flags; /* central way or channel based way */ + enum ldma_chan_on_off onoff; + dma_addr_t desc_phys; + void *desc_base; /* Virtual address */ + u32 desc_cnt; /* Number of descriptors */ + int rst; + u32 hdrm_len; + bool hdrm_csum; + u32 boff_len; + u32 data_endian; + u32 desc_endian; + bool pden; + bool desc_rx_np; + bool data_endian_en; + bool desc_endian_en; + bool abc_en; + bool desc_init; + struct dma_pool *desc_pool; /* Descriptors pool */ + u32 desc_num; + struct dw2_desc_sw *ds; + struct work_struct work; +}; + +struct ldma_port { + struct ldma_dev *ldev; /* back pointer */ + const char *name; + u32 portid; + u32 rxbl; + u32 txbl; + u32 chan_start; + u32 chan_sz; + enum ldma_endian rxendi; + enum ldma_endian txendi; + enum ldma_pkt_drop pkt_drop; + int flush_memcpy; +}; + +/* Instance specific data */ +struct ldma_inst_data { + struct dma_dev_ops *ops; + const char *name; + u32 type; +}; + +struct ldma_dev { + struct device *dev; + void __iomem *base; + struct reset_control *rst; + struct clk *core_clk; + struct dma_device dma_dev; + u32 ver; + int irq; + struct ldma_port *ports; + struct ldma_chan *chans; /* channel list on this DMA or port */ + spinlock_t dev_lock; /* Controller register execlusive */ + u32 chan_nrs; + u32 port_nrs; + u32 flags; + u32 pollcnt; + u32 orrc; /* Outstanding read count */ + const struct ldma_inst_data *inst; + struct workqueue_struct *wq; +}; + +struct dw2_desc { + union { + struct { + u32 len :16; + u32 res0 :7; + u32 bofs :2; + u32 res1 :3; + u32 eop :1; + u32 sop :1; + u32 c :1; + u32 own :1; + } __packed field; + u32 word; + } __packed status; + u32 addr; +} __packed __aligned(8); + +struct dw2_desc_sw { + struct ldma_chan *chan; + struct virt_dma_desc vdesc; + dma_addr_t desc_phys; + size_t desc_cnt; + size_t size; + struct dw2_desc *desc_hw; +}; + +struct dma_dev_ops { + int (*device_alloc_chan_resources)(struct dma_chan *chan); + void (*device_free_chan_resources)(struct dma_chan *chan); + int (*device_config)(struct dma_chan *chan, + struct dma_slave_config *config); + int (*device_pause)(struct dma_chan *chan); + int (*device_resume)(struct dma_chan *chan); + int (*device_terminate_all)(struct dma_chan *chan); + void (*device_synchronize)(struct dma_chan *chan); + enum dma_status (*device_tx_status)(struct dma_chan *chan, + dma_cookie_t cookie, + struct dma_tx_state *txstate); + struct dma_async_tx_descriptor *(*device_prep_slave_sg) + (struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sg_len, enum dma_transfer_direction direction, + unsigned long flags, void *context); + void (*device_issue_pending)(struct dma_chan *chan); +}; + +static inline void +ldma_update_bits(struct ldma_dev *d, u32 mask, u32 val, u32 ofs) +{ + u32 old_val, new_val; + + old_val = readl(d->base + ofs); + new_val = (old_val & ~mask) | (val & mask); + + if (new_val != old_val) + writel(new_val, d->base + ofs); +} + +static inline struct ldma_chan *to_ldma_chan(struct dma_chan *chan) +{ + return container_of(chan, struct ldma_chan, vchan.chan); +} + +static inline struct ldma_dev *to_ldma_dev(struct dma_device *dma_dev) +{ + return container_of(dma_dev, struct ldma_dev, dma_dev); +} + +static inline struct dw2_desc_sw *to_lgm_dma_desc(struct virt_dma_desc *vdesc) +{ + return container_of(vdesc, struct dw2_desc_sw, vdesc); +} + +static inline bool ldma_chan_tx(struct ldma_chan *c) +{ + return !!(c->flags & DMA_TX_CH); +} + +static inline bool ldma_chan_is_hw_desc(struct ldma_chan *c) +{ + return !!(c->flags & DMA_HW_DESC); +} + +static void ldma_dev_reset(struct ldma_dev *d) + +{ + unsigned long flags; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CTRL_RST, DMA_CTRL_RST, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_pkt_arb_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask = DMA_CTRL_PKTARB; + u32 val = enable ? DMA_CTRL_PKTARB : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_sram_desc_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask = DMA_CTRL_DSRAM_PATH; + u32 val = enable ? DMA_CTRL_DSRAM_PATH : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_chan_flow_ctl_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask, val; + + if (d->inst->type != DMA_TYPE_TX) + return; + + mask = DMA_CTRL_CH_FL; + val = enable ? DMA_CTRL_CH_FL : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_global_polling_enable(struct ldma_dev *d) +{ + unsigned long flags; + u32 mask = DMA_CPOLL_EN | DMA_CPOLL_CNT; + u32 val = DMA_CPOLL_EN; + + val |= FIELD_PREP(DMA_CPOLL_CNT, d->pollcnt); + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CPOLL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_desc_fetch_on_demand_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask, val; + + if (d->inst->type == DMA_TYPE_MCPY) + return; + + mask = DMA_CTRL_DS_FOD; + val = enable ? DMA_CTRL_DS_FOD : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_byte_enable_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask = DMA_CTRL_ENBE; + u32 val = enable ? DMA_CTRL_ENBE : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +/* + * orr_cnt >= 16, it will be 16 + * 4 <= orr_cnt < 16, it ill be orr_cnt + * orr_cnt < 4, it will be 3. Minimum 3 orr supported + */ +static void ldma_dev_orrc_cfg(struct ldma_dev *d) +{ + unsigned long flags; + u32 val = 0; + u32 mask; + + if (d->inst->type == DMA_TYPE_RX) + return; + + mask = DMA_ORRC_EN | DMA_ORRC_ORRCNT; + if (d->orrc > 0 && d->orrc <= DMA_ORRC_MAX_CNT) + val = DMA_ORRC_EN | FIELD_PREP(DMA_ORRC_ORRCNT, d->orrc); + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_ORRC); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_df_tout_cfg(struct ldma_dev *d, bool enable, int tcnt) +{ + u32 mask = DMA_CTRL_DESC_TMOUT_CNT_V31; + unsigned long flags; + u32 val; + + if (enable) + val = DMA_CTRL_DESC_TMOUT_EN_V31 | FIELD_PREP(DMA_CTRL_DESC_TMOUT_CNT_V31, tcnt); + else + val = 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_dburst_wr_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask, val; + + if (d->inst->type != DMA_TYPE_RX && d->inst->type != DMA_TYPE_MCPY) + return; + + mask = DMA_CTRL_DBURST_WR; + val = enable ? DMA_CTRL_DBURST_WR : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_vld_fetch_ack_cfg(struct ldma_dev *d, bool enable) +{ + unsigned long flags; + u32 mask, val; + + if (d->inst->type != DMA_TYPE_TX) + return; + + mask = DMA_CTRL_VLD_DF_ACK; + val = enable ? DMA_CTRL_VLD_DF_ACK : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_dev_drb_cfg(struct ldma_dev *d, int enable) +{ + unsigned long flags; + u32 mask = DMA_CTRL_DRB; + u32 val = enable ? DMA_CTRL_DRB : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, mask, val, DMA_CTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static int ldma_dev_cfg(struct ldma_dev *d) +{ + bool enable; + + ldma_dev_pkt_arb_cfg(d, true); + ldma_dev_global_polling_enable(d); + + enable = !!(d->flags & DMA_DFT_DRB); + ldma_dev_drb_cfg(d, enable); + + enable = !!(d->flags & DMA_EN_BYTE_EN); + ldma_dev_byte_enable_cfg(d, enable); + + enable = !!(d->flags & DMA_CHAN_FLOW_CTL); + ldma_dev_chan_flow_ctl_cfg(d, enable); + + enable = !!(d->flags & DMA_DESC_FTOD); + ldma_dev_desc_fetch_on_demand_cfg(d, enable); + + enable = !!(d->flags & DMA_DESC_IN_SRAM); + ldma_dev_sram_desc_cfg(d, enable); + + enable = !!(d->flags & DMA_DBURST_WR); + ldma_dev_dburst_wr_cfg(d, enable); + + enable = !!(d->flags & DMA_VLD_FETCH_ACK); + ldma_dev_vld_fetch_ack_cfg(d, enable); + + if (d->ver > DMA_VER22) { + ldma_dev_orrc_cfg(d); + ldma_dev_df_tout_cfg(d, true, DMA_DFT_DESC_TCNT); + } + + dev_dbg(d->dev, "%s Controller 0x%08x configuration done\n", + d->inst->name, readl(d->base + DMA_CTRL)); + + return 0; +} + +static int ldma_chan_cctrl_cfg(struct ldma_chan *c, u32 val) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 reg; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + reg = readl(d->base + DMA_CCTRL); + /* Read from hardware */ + if (reg & DMA_CCTRL_DIR_TX) + c->flags |= DMA_TX_CH; + else + c->flags |= DMA_RX_CH; + + /* Keep the class value unchanged */ + reg &= DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH; + reg |= val; + writel(reg, d->base + DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + return 0; +} + +static void ldma_chan_irq_init(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 enofs, crofs; + u32 cn_bit; + + if (c->nr < MAX_LOWER_CHANS) { + enofs = DMA_IRNEN; + crofs = DMA_IRNCR; + } else { + enofs = DMA_IRNEN1; + crofs = DMA_IRNCR1; + } + + cn_bit = BIT(c->nr & MASK_LOWER_CHANS); + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + + /* Clear all interrupts and disabled it */ + writel(0, d->base + DMA_CIE); + writel(DMA_CI_ALL, d->base + DMA_CIS); + + ldma_update_bits(d, cn_bit, 0, enofs); + writel(cn_bit, d->base + crofs); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_set_class(struct ldma_chan *c, u32 val) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 class_val; + + if (d->inst->type == DMA_TYPE_MCPY || val > DMA_MAX_CLASS) + return; + + /* 3 bits low */ + class_val = FIELD_PREP(DMA_CCTRL_CLASS, val & 0x7); + /* 2 bits high */ + class_val |= FIELD_PREP(DMA_CCTRL_CLASSH, (val >> 3) & 0x3); + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, DMA_CCTRL_CLASS | DMA_CCTRL_CLASSH, class_val, + DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static int ldma_chan_on(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + + /* If descriptors not configured, not allow to turn on channel */ + if (WARN_ON(!c->desc_init)) + return -EINVAL; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, DMA_CCTRL_ON, DMA_CCTRL_ON, DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + c->onoff = DMA_CH_ON; + + return 0; +} + +static int ldma_chan_off(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 val; + int ret; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, DMA_CCTRL_ON, 0, DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val, + !(val & DMA_CCTRL_ON), 0, 10000); + if (ret) + return ret; + + c->onoff = DMA_CH_OFF; + + return 0; +} + +static void ldma_chan_desc_hw_cfg(struct ldma_chan *c, dma_addr_t desc_base, + int desc_num) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + writel(lower_32_bits(desc_base), d->base + DMA_CDBA); + /* High 4 bits */ + if (IS_ENABLED(CONFIG_64BIT)) { + u32 hi = upper_32_bits(desc_base) & 0xF; + + ldma_update_bits(d, DMA_CDBA_MSB, + FIELD_PREP(DMA_CDBA_MSB, hi), DMA_CCTRL); + } + writel(desc_num, d->base + DMA_CDLEN); + spin_unlock_irqrestore(&d->dev_lock, flags); + + c->desc_init = true; +} + +/* + * Descriptor base address and data pointer must be physical address when + * writen to the register. + * This API will be used by CBM which configure hardware descriptor. + */ +static int ldma_chan_desc_cfg(struct ldma_chan *c, dma_addr_t desc_base, + int desc_num) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + + if (!desc_num) { + dev_err(d->dev, "Channel %d must allocate descriptor first\n", + c->nr); + return -EINVAL; + } + + if (desc_num > DMA_MAX_DESC_NUM) { + dev_err(d->dev, "Channel %d descriptor number out of range %d\n", + c->nr, desc_num); + return -EINVAL; + } + + ldma_chan_desc_hw_cfg(c, desc_base, desc_num); + + c->flags |= DMA_HW_DESC; + c->desc_cnt = desc_num; + c->desc_phys = desc_base; + + return 0; +} + +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, + int desc_num) +{ + return ldma_chan_desc_cfg(to_ldma_chan(chan), desc_base, desc_num); +} +EXPORT_SYMBOL_GPL(intel_dma_chan_desc_cfg); + +static int ldma_chan_reset(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 val; + int ret; + + ret = ldma_chan_off(c); + if (ret) + return ret; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, DMA_CCTRL_RST, DMA_CCTRL_RST, DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + ret = readl_poll_timeout_atomic(d->base + DMA_CCTRL, val, + !(val & DMA_CCTRL_RST), 0, 10000); + if (ret) + return ret; + + c->rst = 1; + c->desc_init = false; + + return 0; +} + +static void ldma_chan_byte_offset_cfg(struct ldma_chan *c, u32 boff_len) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + u32 mask = DMA_C_BOFF_EN | DMA_C_BOFF_BOF_LEN; + unsigned long flags; + u32 val; + + if (boff_len > 0 && boff_len <= DMA_CHAN_BOFF_MAX) + val = FIELD_PREP(DMA_C_BOFF_BOF_LEN, boff_len) | DMA_C_BOFF_EN; + else + val = 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_C_BOFF); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_data_endian_cfg(struct ldma_chan *c, bool enable, + u32 endian_type) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + u32 mask = DMA_C_END_DE_EN | DMA_C_END_DATAENDI; + unsigned long flags; + u32 val; + + if (enable) + val = DMA_C_END_DE_EN | FIELD_PREP(DMA_C_END_DATAENDI, endian_type); + else + val = 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_C_ENDIAN); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_desc_endian_cfg(struct ldma_chan *c, bool enable, + u32 endian_type) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + u32 mask = DMA_C_END_DES_EN | DMA_C_END_DESENDI; + unsigned long flags; + u32 val; + + if (enable) + val = DMA_C_END_DES_EN | FIELD_PREP(DMA_C_END_DESENDI, endian_type); + else + val = 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_C_ENDIAN); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_hdr_mode_cfg(struct ldma_chan *c, u32 hdr_len, bool csum) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + + unsigned long flags; + u32 mask, val; + + /* NB, csum disabled, hdr length must be provided */ + if (!csum && (!hdr_len || hdr_len > DMA_HDR_LEN_MAX)) + return; + + mask = DMA_C_HDRM_HDR_SUM; + val = DMA_C_HDRM_HDR_SUM; + + if (!csum && hdr_len) + val = hdr_len; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_C_HDRM); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_rxwr_np_cfg(struct ldma_chan *c, bool enable) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 mask, val; + + /* Only valid for RX channel */ + if (ldma_chan_tx(c)) + return; + + mask = DMA_CCTRL_WR_NP_EN; + val = enable ? DMA_CCTRL_WR_NP_EN : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void ldma_chan_abc_cfg(struct ldma_chan *c, bool enable) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + u32 mask, val; + + if (d->ver < DMA_VER32 || ldma_chan_tx(c)) + return; + + mask = DMA_CCTRL_CH_ABC; + val = enable ? DMA_CCTRL_CH_ABC : 0; + + spin_lock_irqsave(&d->dev_lock, flags); + ldma_update_bits(d, DMA_CS_MASK, c->nr, DMA_CS); + ldma_update_bits(d, mask, val, DMA_CCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static int ldma_port_cfg(struct ldma_port *p) +{ + unsigned long flags; + struct ldma_dev *d; + u32 reg; + + d = p->ldev; + reg = p->flush_memcpy ? DMA_PCTRL_MEM_FLUSH : 0; + reg |= FIELD_PREP(DMA_PCTRL_TXENDI, p->txendi); + reg |= FIELD_PREP(DMA_PCTRL_RXENDI, p->rxendi); + + if (d->ver == DMA_VER22) { + reg |= FIELD_PREP(DMA_PCTRL_TXBL, p->txbl); + reg |= FIELD_PREP(DMA_PCTRL_RXBL, p->rxbl); + } else { + reg |= FIELD_PREP(DMA_PCTRL_PDEN, p->pkt_drop); + + if (p->txbl == DMA_BURSTL_32DW) + reg |= DMA_PCTRL_TXBL32; + else if (p->txbl == DMA_BURSTL_16DW) + reg |= DMA_PCTRL_TXBL16; + else + reg |= FIELD_PREP(DMA_PCTRL_TXBL, DMA_PCTRL_TXBL_8); + + if (p->rxbl == DMA_BURSTL_32DW) + reg |= DMA_PCTRL_RXBL32; + else if (p->rxbl == DMA_BURSTL_16DW) + reg |= DMA_PCTRL_RXBL16; + else + reg |= FIELD_PREP(DMA_PCTRL_RXBL, DMA_PCTRL_RXBL_8); + } + + spin_lock_irqsave(&d->dev_lock, flags); + writel(p->portid, d->base + DMA_PS); + writel(reg, d->base + DMA_PCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + dev_dbg(d->dev, "%s Port Control 0x%08x configuration done\n", + p->name, readl(d->base + DMA_PCTRL)); + + return 0; +} + +static int ldma_chan_cfg(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + u32 reg; + + reg = c->pden ? DMA_CCTRL_PDEN : 0; + reg |= c->onoff ? DMA_CCTRL_ON : 0; + reg |= c->rst ? DMA_CCTRL_RST : 0; + + ldma_chan_cctrl_cfg(c, reg); + ldma_chan_irq_init(c); + + if (d->ver > DMA_VER22) { + ldma_chan_set_class(c, c->nr); + ldma_chan_byte_offset_cfg(c, c->boff_len); + ldma_chan_data_endian_cfg(c, c->data_endian_en, c->data_endian); + ldma_chan_desc_endian_cfg(c, c->desc_endian_en, c->desc_endian); + ldma_chan_hdr_mode_cfg(c, c->hdrm_len, c->hdrm_csum); + ldma_chan_rxwr_np_cfg(c, c->desc_rx_np); + ldma_chan_abc_cfg(c, c->abc_en); + + if (ldma_chan_is_hw_desc(c)) + ldma_chan_desc_hw_cfg(c, c->desc_phys, c->desc_cnt); + } + + return 0; +} + +static void ldma_dev_init(struct ldma_dev *d) +{ + struct ldma_port *p; + struct ldma_chan *c; + int i; + + spin_lock_init(&d->dev_lock); + ldma_dev_reset(d); + ldma_dev_cfg(d); + + /* DMA port initialization */ + for (i = 0; i < d->port_nrs; i++) { + p = &d->ports[i]; + ldma_port_cfg(p); + } + + /* DMA channel initialization */ + for (i = 0; i < d->chan_nrs; i++) { + c = &d->chans[i]; + ldma_chan_cfg(c); + } +} + +/* + * The configuration stored in the devicetree matches the configuration + * parameters of the peripheral instance and allows the driver to know which + * features are implemented and how it should behave. Users only configure + * what is necessary. All other setting will fall back to default setting + */ +static int dma_parse_chan_dt(struct fwnode_handle *fw_chan, struct ldma_dev *d) +{ + struct ldma_chan *c; + u32 v[2], val; + int ret; + + ret = fwnode_property_read_u32(fw_chan, "reg", &val); + if (ret) + return ret; + + /* Sanity check for channel range */ + if (val >= d->chan_nrs) + return -ENODEV; + + c = &d->chans[val]; + + ret = fwnode_property_read_u32(fw_chan, "intel,desc_num", &c->desc_num); + if (ret || (!ret && c->desc_num > 255)) + c->desc_num = DMA_DFT_DESC_NUM; + + if (!fwnode_property_read_u32(fw_chan, "intel,data-endian", &val)) { + if (val > DMA_ENDIAN_MAX) + return -EINVAL; + c->data_endian = val; + } + + if (!fwnode_property_read_u32(fw_chan, "intel,desc-endian", &val)) { + if (val > DMA_ENDIAN_MAX) + return -EINVAL; + c->desc_endian = val; + } + + if (fwnode_property_read_u32(fw_chan, "intel,byte-offset", + &c->boff_len)) + c->boff_len = 0; + + if (!fwnode_property_read_u32_array(fw_chan, "intel,hdr-mode", v, + ARRAY_SIZE(v))) { + c->hdrm_csum = !!v[1]; + if (!c->hdrm_csum) { + if (!v[0] || v[0] > DMA_HDR_LEN_MAX) + return -EINVAL; + } + c->hdrm_len = v[0]; + } + + if (!fwnode_property_read_u32_array(fw_chan, "intel,chan-hw-desc", v, + ARRAY_SIZE(v))) { + u32 cnt = v[1]; + + if (!cnt) { + dev_err(d->dev, + "Channel %d must allocate descriptor first\n", + c->nr); + return -EINVAL; + } + + if (cnt > DMA_MAX_DESC_NUM) { + dev_err(d->dev, + "Channel %d descriptor number out of range %d\n", + c->nr, cnt); + return -EINVAL; + } + c->desc_phys = v[0]; + c->desc_cnt = cnt; + c->flags |= DMA_HW_DESC; + } + + return 0; +} + +static unsigned int dma_get_channel_node_count(struct ldma_dev *d) +{ + struct fwnode_handle *fwnode = dev_fwnode(d->dev); + struct fwnode_handle *fw_chans; + struct fwnode_handle *child; + unsigned int count = 0; + + fw_chans = fwnode_get_named_child_node(fwnode, "dma-channels"); + fwnode_for_each_child_node(fw_chans, child) + count++; + + return count; +} + +static int dma_parse_port_dt(struct fwnode_handle *fw_port, struct ldma_dev *d) +{ + struct ldma_port *p; + u32 val, v[2]; + int ret; + + ret = fwnode_property_read_u32(fw_port, "reg", &val); + if (ret) + return ret; + + /* Sanit check */ + if (val >= d->port_nrs) + return -ENODEV; + + p = &d->ports[val]; + + ret = fwnode_property_read_string(fw_port, "intel,name", &p->name); + if (ret) { + dev_err(d->dev, "Failed to get port name ret=%d\n", ret); + return ret; + } + + ret = fwnode_property_read_u32_array(fw_port, "intel,chans", v, + ARRAY_SIZE(v)); + if (ret) { + dev_err(d->dev, "Failed to get port chan mapping ret=%d\n", + ret); + return ret; + } + p->chan_start = v[0]; + p->chan_sz = v[1]; + + p->txbl = DMA_DFT_BURST_V22; + + /* TX and RX has the same burst length */ + p->txbl = ilog2(p->txbl); + p->rxbl = p->txbl; + + if (!strncmp(p->name, "MEMCPY", 4)) + p->flush_memcpy = 1; + + /* + * Get max available channels instead of reading from regsiters + */ + d->chan_nrs = dma_get_channel_node_count(d); + + dev_dbg(d->dev, "Port %s burst %d endian %d\n", + p->name, p->rxbl, p->rxendi); + + return 0; +} + +static int ldma_cfg_init(struct ldma_dev *d) +{ + struct fwnode_handle *fwnode = dev_fwnode(d->dev); + struct fwnode_handle *fw_chans, *fw_chan; + struct fwnode_handle *fw_ports, *fw_port; + struct ldma_chan *c; + struct ldma_port *p; + u32 prop, val; + int ret, i; + + if (fwnode_property_read_bool(fwnode, "intel,dma-chan-fc")) + d->flags |= DMA_CHAN_FLOW_CTL; + + if (fwnode_property_read_bool(fwnode, "intel,dma-desc-fod")) + d->flags |= DMA_DESC_FTOD; + + if (fwnode_property_read_bool(fwnode, "intel,dma-desc-in-sram")) + d->flags |= DMA_DESC_IN_SRAM; + + if (fwnode_property_read_bool(fwnode, "intel,dma-byte-en")) + d->flags |= DMA_EN_BYTE_EN; + + if (fwnode_property_read_bool(fwnode, "intel,dma-dfetch-ack")) + d->flags |= DMA_VLD_FETCH_ACK; + + if (fwnode_property_read_bool(fwnode, "intel,dma-dburst-wr")) + d->flags |= DMA_DBURST_WR; + + if (fwnode_property_read_bool(fwnode, "intel,dma-drb")) + d->flags |= DMA_DFT_DRB; + + if (fwnode_property_read_u32(fwnode, "intel,dma-polling-cnt", + &d->pollcnt)) + d->pollcnt = DMA_DFT_POLL_CNT; + + if (!fwnode_property_read_u32(fwnode, "intel,dma-orrc", &val)) { + if (val > DMA_ORRC_MAX_CNT) + return -EINVAL; + d->orrc = val; + } + + if (d->ver > DMA_VER22) { + if (!d->port_nrs) + return -EINVAL; + + for (i = 0; i < d->port_nrs; i++) { + p = &d->ports[i]; + p->rxendi = DMA_DFT_ENDIAN; + p->txendi = DMA_DFT_ENDIAN; + + if (!fwnode_property_read_u32(fwnode, "intel,dma-burst", + &prop)) { + p->rxbl = prop; + p->txbl = prop; + } else { + p->rxbl = DMA_DFT_BURST; + p->txbl = DMA_DFT_BURST; + } + + p->pkt_drop = DMA_PKT_DROP_DIS; + p->flush_memcpy = 0; + } + } + + /* Port specific, required for dma0 */ + fw_ports = fwnode_get_named_child_node(fwnode, "dma-ports"); + if (!fw_ports && d->ver == DMA_VER22) { + dev_err(d->dev, "Failed to get ports settings\n"); + return -ENODEV; + } + if (fw_ports) { + fwnode_for_each_child_node(fw_ports, fw_port) { + ret = dma_parse_port_dt(fw_port, d); + if (ret) { + fwnode_handle_put(fw_port); + fwnode_handle_put(fw_ports); + return -EINVAL; + } + } + fwnode_handle_put(fw_ports); + } + + d->chans = devm_kcalloc(d->dev, d->chan_nrs, sizeof(*c), GFP_KERNEL); + if (!d->chans) + return -ENOMEM; + + /* Channel based configuration if available, optional */ + fw_chans = fwnode_get_named_child_node(fwnode, "dma-channels"); + if (fw_chans) { + fwnode_for_each_child_node(fw_chans, fw_chan) { + if (dma_parse_chan_dt(fw_chan, d)) { + fwnode_handle_put(fw_chan); + fwnode_handle_put(fw_chans); + return -EINVAL; + } + } + fwnode_handle_put(fw_chans); + } + + return 0; +} + +static void dma_free_desc_resource(struct virt_dma_desc *vdesc) +{ + struct dw2_desc_sw *ds = to_lgm_dma_desc(vdesc); + struct ldma_chan *c = ds->chan; + + dma_pool_free(c->desc_pool, ds->desc_hw, ds->desc_phys); + kfree(ds); + c->ds = NULL; +} + +static struct dw2_desc_sw * +dma_alloc_desc_resource(int num, struct ldma_chan *c) +{ + struct device *dev = c->vchan.chan.device->dev; + struct dw2_desc_sw *ds; + + if (num > c->desc_num) { + dev_err(dev, "sg num %d exceed max %d\n", num, c->desc_num); + return NULL; + } + + ds = kzalloc(sizeof(*ds), GFP_NOWAIT); + if (!ds) + return NULL; + + ds->chan = c; + + ds->desc_hw = dma_pool_zalloc(c->desc_pool, GFP_ATOMIC, + &ds->desc_phys); + if (!ds->desc_hw) { + dev_dbg(dev, "out of memory for link descriptor\n"); + kfree(ds); + return NULL; + } + ds->desc_cnt = num; + + return ds; +} + +static void ldma_chan_irq_en(struct ldma_chan *c) +{ + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + + spin_lock_irqsave(&d->dev_lock, flags); + writel(c->nr, d->base + DMA_CS); + writel(DMA_CI_EOP, d->base + DMA_CIE); + writel(BIT(c->nr), d->base + DMA_IRNEN); + spin_unlock_irqrestore(&d->dev_lock, flags); +} + +static void dma_issue_pending(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + unsigned long flags; + + if (d->ver == DMA_VER22) { + spin_lock_irqsave(&c->vchan.lock, flags); + if (vchan_issue_pending(&c->vchan)) { + struct virt_dma_desc *vdesc; + + /* Get the next descriptor */ + vdesc = vchan_next_desc(&c->vchan); + if (!vdesc) { + c->ds = NULL; + return; + } + list_del(&vdesc->node); + c->ds = to_lgm_dma_desc(vdesc); + spin_unlock_irqrestore(&c->vchan.lock, flags); + ldma_chan_desc_hw_cfg(c, c->ds->desc_phys, c->ds->desc_cnt); + ldma_chan_irq_en(c); + } + } + ldma_chan_on(c); +} + +static void dma_synchronize(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + + /* + * clear any pending work if any. In that + * case the resource needs to be free here. + */ + cancel_work_sync(&c->work); + vchan_synchronize(&c->vchan); + if (c->ds) + dma_free_desc_resource(&c->ds->vdesc); +} + +static int dma_terminate_all(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + unsigned long flags; + LIST_HEAD(head); + + spin_lock_irqsave(&c->vchan.lock, flags); + vchan_get_all_descriptors(&c->vchan, &head); + spin_unlock_irqrestore(&c->vchan.lock, flags); + vchan_dma_desc_free_list(&c->vchan, &head); + + return ldma_chan_reset(c); +} + +static int dma_resume_chan(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + + ldma_chan_on(c); + + return 0; +} + +static int dma_pause_chan(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + + return ldma_chan_off(c); +} + +static enum dma_status +dma_tx_status(struct dma_chan *chan, dma_cookie_t cookie, + struct dma_tx_state *txstate) +{ + struct ldma_chan *c = to_ldma_chan(chan); + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + enum dma_status status = DMA_COMPLETE; + + if (d->ver == DMA_VER22) + status = dma_cookie_status(chan, cookie, txstate); + + return status; +} + +static void dma_chan_irq(int irq, void *data) +{ + struct ldma_chan *c = data; + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + u32 stat; + + /* Disable channel interrupts */ + writel(c->nr, d->base + DMA_CS); + stat = readl(d->base + DMA_CIS); + if (!stat) + return; + + writel(readl(d->base + DMA_CIE) & ~DMA_CI_ALL, d->base + DMA_CIE); + writel(stat, d->base + DMA_CIS); + queue_work(d->wq, &c->work); +} + +static irqreturn_t dma_interrupt(int irq, void *dev_id) +{ + struct ldma_dev *d = dev_id; + struct ldma_chan *c; + unsigned long irncr; + u32 cid; + + irncr = readl(d->base + DMA_IRNCR); + if (!irncr) { + dev_err(d->dev, "dummy interrupt\n"); + return IRQ_NONE; + } + + for_each_set_bit(cid, &irncr, d->chan_nrs) { + /* Mask */ + writel(readl(d->base + DMA_IRNEN) & ~BIT(cid), d->base + DMA_IRNEN); + /* Ack */ + writel(readl(d->base + DMA_IRNCR) | BIT(cid), d->base + DMA_IRNCR); + + c = &d->chans[cid]; + dma_chan_irq(irq, c); + } + + return IRQ_HANDLED; +} + +static struct dma_async_tx_descriptor * +dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, + unsigned int sglen, enum dma_transfer_direction dir, + unsigned long flags, void *context) +{ + struct ldma_chan *c = to_ldma_chan(chan); + size_t len, avail, total = 0; + struct dw2_desc *hw_ds; + struct dw2_desc_sw *ds; + struct scatterlist *sg; + int num = sglen, i; + dma_addr_t addr; + + if (!sgl) + return NULL; + + for_each_sg(sgl, sg, sglen, i) { + avail = sg_dma_len(sg); + if (avail > DMA_MAX_SIZE) + num += DIV_ROUND_UP(avail, DMA_MAX_SIZE) - 1; + } + + ds = dma_alloc_desc_resource(num, c); + if (!ds) + return NULL; + + c->ds = ds; + + num = 0; + /* sop and eop has to be handled nicely */ + for_each_sg(sgl, sg, sglen, i) { + addr = sg_dma_address(sg); + avail = sg_dma_len(sg); + total += avail; + + do { + len = min_t(size_t, avail, DMA_MAX_SIZE); + + hw_ds = &ds->desc_hw[num]; + switch (sglen) { + case 1: + hw_ds->status.field.sop = 1; + hw_ds->status.field.eop = 1; + break; + default: + if (num == 0) { + hw_ds->status.field.sop = 1; + hw_ds->status.field.eop = 0; + } else if (num == (sglen - 1)) { + hw_ds->status.field.sop = 0; + hw_ds->status.field.eop = 1; + } else { + hw_ds->status.field.sop = 0; + hw_ds->status.field.eop = 0; + } + break; + } + + /* Only 32 bit address supported */ + hw_ds->addr = (u32)addr; + hw_ds->status.field.len = len; + hw_ds->status.field.c = 0; + hw_ds->status.field.bofs = addr & 0x3; + /* Ensure data ready before ownership change */ + wmb(); + hw_ds->status.field.own = DMA_OWN; + /* Ensure ownership changed before moving forward */ + wmb(); + num++; + addr += len; + avail -= len; + } while (avail); + } + + ds->size = total; + + return vchan_tx_prep(&c->vchan, &ds->vdesc, DMA_CTRL_ACK); +} + +static int +dma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg) +{ + struct ldma_chan *c = to_ldma_chan(chan); + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + struct ldma_port *p = c->port; + unsigned long flags; + u32 bl; + + if ((cfg->direction == DMA_DEV_TO_MEM && + cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || + (cfg->direction == DMA_MEM_TO_DEV && + cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) || + !is_slave_direction(cfg->direction)) + return -EINVAL; + + /* Default setting will be used */ + if (!cfg->src_maxburst && !cfg->dst_maxburst) + return 0; + + /* Must be the same */ + if (cfg->src_maxburst && cfg->dst_maxburst && + cfg->src_maxburst != cfg->dst_maxburst) + return -EINVAL; + + if (cfg->dst_maxburst) + cfg->src_maxburst = cfg->dst_maxburst; + + bl = ilog2(cfg->src_maxburst); + + spin_lock_irqsave(&d->dev_lock, flags); + writel(p->portid, d->base + DMA_PS); + ldma_update_bits(d, DMA_PCTRL_RXBL | DMA_PCTRL_TXBL, + FIELD_PREP(DMA_PCTRL_RXBL, bl) | + FIELD_PREP(DMA_PCTRL_TXBL, bl), DMA_PCTRL); + spin_unlock_irqrestore(&d->dev_lock, flags); + + return 0; +} + +static int dma_alloc_chan_resources(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + struct device *dev = c->vchan.chan.device->dev; + size_t desc_sz; + + if (d->ver > DMA_VER22) { + c->flags |= CHAN_IN_USE; + return 0; + } + + if (c->desc_pool) + return c->desc_num; + + desc_sz = c->desc_num * sizeof(struct dw2_desc); + c->desc_pool = dma_pool_create(c->name, dev, desc_sz, + __alignof__(struct dw2_desc), 0); + + if (!c->desc_pool) { + dev_err(dev, "unable to allocate descriptor pool\n"); + return -ENOMEM; + } + + return c->desc_num; +} + +static void dma_free_chan_resources(struct dma_chan *chan) +{ + struct ldma_chan *c = to_ldma_chan(chan); + struct ldma_dev *d = to_ldma_dev(c->vchan.chan.device); + + if (d->ver == DMA_VER22) { + dma_pool_destroy(c->desc_pool); + c->desc_pool = NULL; + vchan_free_chan_resources(to_virt_chan(chan)); + ldma_chan_reset(c); + } else { + c->flags &= ~CHAN_IN_USE; + } +} + +static void dma_work(struct work_struct *work) +{ + struct ldma_chan *c = container_of(work, struct ldma_chan, work); + struct dma_async_tx_descriptor *tx = &c->ds->vdesc.tx; + struct dmaengine_desc_callback cb; + + dmaengine_desc_get_callback(tx, &cb); + dma_cookie_complete(tx); + dmaengine_desc_callback_invoke(&cb, NULL); +} + +int update_client_configs(struct of_dma *ofdma, struct of_phandle_args *spec) +{ + struct ldma_dev *d = ofdma->of_dma_data; + struct ldma_port *p; + struct ldma_chan *c; + u32 chan_id = spec->args[0]; + u32 port_id = spec->args[1]; + + if (chan_id >= d->chan_nrs || port_id >= d->port_nrs) + return 0; + + p = &d->ports[port_id]; + c = &d->chans[chan_id]; + + if (d->ver == DMA_VER22) { + u32 burst = spec->args[2]; + + if (burst != 2 && burst != 4 && burst != 8) + return 0; + + /* TX and RX has the same burst length */ + p->txbl = ilog2(burst); + p->rxbl = p->txbl; + + ldma_port_cfg(p); + } else { + if (spec->args[2] > 0 && spec->args[2] <= DMA_ENDIAN_TYPE3) { + c->data_endian = spec->args[2]; + c->data_endian_en = true; + } + + if (spec->args[3] > 0 && spec->args[3] <= DMA_ENDIAN_TYPE3) { + c->desc_endian = spec->args[3]; + c->desc_endian_en = true; + } + + if (spec->args[4] > 0 && spec->args[4] < 128) + c->boff_len = spec->args[4]; + + if (spec->args[5]) + c->desc_rx_np = true; + + /* + * If channel packet drop enabled, port packet drop should + * be enabled + */ + if (spec->args[6]) { + c->pden = true; + p->pkt_drop = DMA_PKT_DROP_EN; + } + ldma_port_cfg(p); + ldma_chan_cfg(c); + } + + return 1; +} + +static struct dma_chan *ldma_xlate(struct of_phandle_args *spec, + struct of_dma *ofdma) +{ + struct ldma_dev *d = ofdma->of_dma_data; + u32 chan_id = spec->args[0]; + int ret; + + if (!spec->args_count) + return NULL; + + /* if args_count is 1 use driver default config settings */ + if (spec->args_count > 1) { + ret = update_client_configs(ofdma, spec); + if (!ret) + return NULL; + } + + return dma_get_slave_channel(&d->chans[chan_id].vchan.chan); +} + +static void ldma_clk_disable(void *data) +{ + struct ldma_dev *d = data; + + clk_disable_unprepare(d->core_clk); +} + +static struct dma_dev_ops dma0_ops = { + .device_alloc_chan_resources = dma_alloc_chan_resources, + .device_free_chan_resources = dma_free_chan_resources, + .device_config = dma_slave_config, + .device_prep_slave_sg = dma_prep_slave_sg, + .device_tx_status = dma_tx_status, + .device_pause = dma_pause_chan, + .device_resume = dma_resume_chan, + .device_terminate_all = dma_terminate_all, + .device_synchronize = dma_synchronize, + .device_issue_pending = dma_issue_pending, +}; + +static struct dma_dev_ops hdma_ops = { + .device_alloc_chan_resources = dma_alloc_chan_resources, + .device_free_chan_resources = dma_free_chan_resources, + .device_terminate_all = dma_terminate_all, + .device_issue_pending = dma_issue_pending, + .device_tx_status = dma_tx_status, + .device_resume = dma_resume_chan, + .device_pause = dma_pause_chan, +}; + +static const struct ldma_inst_data dma0 = { + .name = "dma0", + .ops = &dma0_ops, +}; + +static const struct ldma_inst_data dma2tx = { + .name = "dma2tx", + .type = DMA_TYPE_TX, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data dma1rx = { + .name = "dma1rx", + .type = DMA_TYPE_RX, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data dma1tx = { + .name = "dma1tx", + .type = DMA_TYPE_TX, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data dma0tx = { + .name = "dma0tx", + .type = DMA_TYPE_TX, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data dma3 = { + .name = "dma3", + .type = DMA_TYPE_MCPY, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data toe_dma30 = { + .name = "toe_dma30", + .type = DMA_TYPE_MCPY, + .ops = &hdma_ops, +}; + +static const struct ldma_inst_data toe_dma31 = { + .name = "toe_dma31", + .type = DMA_TYPE_MCPY, + .ops = &hdma_ops, +}; + +static const struct of_device_id intel_ldma_match[] = { + { .compatible = "intel,lgm-cdma", .data = &dma0}, + { .compatible = "intel,lgm-dma2tx", .data = &dma2tx}, + { .compatible = "intel,lgm-dma1rx", .data = &dma1rx}, + { .compatible = "intel,lgm-dma1tx", .data = &dma1tx}, + { .compatible = "intel,lgm-dma0tx", .data = &dma0tx}, + { .compatible = "intel,lgm-dma3", .data = &dma3}, + { .compatible = "intel,lgm-toe-dma30", .data = &toe_dma30}, + { .compatible = "intel,lgm-toe-dma31", .data = &toe_dma31}, + {} +}; + +static int intel_ldma_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct dma_device *dma_dev; + struct ldma_chan *c; + struct ldma_port *p; + struct ldma_dev *d; + u32 id, bitn = 32; + int i, j, k, ret; + + d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL); + if (!d) + return -ENOMEM; + + /* Link controller to platform device */ + d->dev = &pdev->dev; + + d->inst = device_get_match_data(dev); + if (!d->inst) { + dev_err(dev, "No device match found\n"); + return -ENODEV; + } + + d->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(d->base)) + return PTR_ERR(d->base); + + /* Power up and reset the dma engine, some DMAs always on?? */ + d->core_clk = devm_clk_get_optional(dev, NULL); + if (IS_ERR(d->core_clk)) + return PTR_ERR(d->core_clk); + clk_prepare_enable(d->core_clk); + + ret = devm_add_action_or_reset(dev, ldma_clk_disable, d); + if (ret) { + dev_err(dev, "Failed to devm_add_action_or_reset, %d\n", ret); + return ret; + } + + d->rst = devm_reset_control_get_optional(dev, NULL); + if (IS_ERR(d->rst)) + return PTR_ERR(d->rst); + reset_control_deassert(d->rst); + + id = readl(d->base + DMA_ID); + d->chan_nrs = FIELD_GET(DMA_ID_CHNR, id); + d->port_nrs = FIELD_GET(DMA_ID_PNR, id); + d->ver = FIELD_GET(DMA_ID_REV, id); + + if (id & DMA_ID_AW_36B) + d->flags |= DMA_ADDR_36BIT; + + if (IS_ENABLED(CONFIG_64BIT)) { + if (id & DMA_ID_AW_36B) + bitn = 36; + } + + if (id & DMA_ID_DW_128B) + d->flags |= DMA_DATA_128BIT; + + ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(bitn)); + if (ret) { + dev_err(dev, "No usable DMA configuration\n"); + return ret; + } + + if (d->ver == DMA_VER22) { + d->irq = platform_get_irq(pdev, 0); + if (d->irq < 0) + return d->irq; + + ret = devm_request_irq(&pdev->dev, d->irq, dma_interrupt, + 0, DRIVER_NAME, d); + if (ret) + return ret; + + d->wq = alloc_ordered_workqueue("dma_wq", WQ_MEM_RECLAIM | + WQ_HIGHPRI); + if (!d->wq) + return -ENOMEM; + } + + dma_dev = &d->dma_dev; + dma_cap_set(DMA_SLAVE, dma_dev->cap_mask); + + /* Channel initializations */ + INIT_LIST_HEAD(&dma_dev->channels); + + /* Port Initializations */ + d->ports = devm_kcalloc(dev, d->port_nrs, sizeof(*p), GFP_KERNEL); + if (!d->ports) + return -ENOMEM; + + for (i = 0; i < d->port_nrs; i++) { + p = &d->ports[i]; + p->portid = i; + p->ldev = d; + } + + ret = ldma_cfg_init(d); + if (ret) + return ret; + + dma_dev->dev = &pdev->dev; + /* + * Link channel id to channel index and link to dma channel list + * It also back points to controller and its port + */ + for (i = 0, k = 0; i < d->port_nrs; i++) { + if (d->ver == DMA_VER22) { + u32 chan_end; + + p = &d->ports[i]; + chan_end = p->chan_start + p->chan_sz; + for (j = p->chan_start; j < chan_end; j++) { + c = &d->chans[k]; + c->port = p; + c->nr = j; /* Real channel number */ + c->rst = DMA_CHAN_RST; + snprintf(c->name, sizeof(c->name), "chan%d", + c->nr); + INIT_WORK(&c->work, dma_work); + c->vchan.desc_free = dma_free_desc_resource; + vchan_init(&c->vchan, dma_dev); + k++; + } + } else { + p = &d->ports[i]; + for (i = 0; i < d->chan_nrs; i++) { + c = &d->chans[i]; + c->port = p; + c->data_endian = DMA_DFT_ENDIAN; + c->desc_endian = DMA_DFT_ENDIAN; + c->data_endian_en = false; + c->desc_endian_en = false; + c->desc_rx_np = false; + c->flags |= DEVICE_ALLOC_DESC; + c->onoff = DMA_CH_OFF; + c->rst = DMA_CHAN_RST; + c->abc_en = true; + c->nr = i; + c->vchan.desc_free = dma_free_desc_resource; + vchan_init(&c->vchan, dma_dev); + } + } + } + + /* Set DMA capabilities */ + dma_cap_zero(dma_dev->cap_mask); + + dma_dev->device_alloc_chan_resources = + d->inst->ops->device_alloc_chan_resources; + dma_dev->device_free_chan_resources = + d->inst->ops->device_free_chan_resources; + dma_dev->device_terminate_all = d->inst->ops->device_terminate_all; + dma_dev->device_issue_pending = d->inst->ops->device_issue_pending; + dma_dev->device_tx_status = d->inst->ops->device_tx_status; + dma_dev->device_resume = d->inst->ops->device_resume; + dma_dev->device_pause = d->inst->ops->device_pause; + dma_dev->device_config = d->inst->ops->device_config; + dma_dev->device_prep_slave_sg = d->inst->ops->device_prep_slave_sg; + dma_dev->device_synchronize = d->inst->ops->device_synchronize; + + if (d->ver == DMA_VER22) { + dma_dev->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + dma_dev->dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES); + dma_dev->directions = BIT(DMA_MEM_TO_DEV) | + BIT(DMA_DEV_TO_MEM); + dma_dev->residue_granularity = + DMA_RESIDUE_GRANULARITY_DESCRIPTOR; + } + + platform_set_drvdata(pdev, d); + + ldma_dev_init(d); + + ret = dma_async_device_register(dma_dev); + if (ret) { + dev_err(dev, "Failed to register slave DMA engine device\n"); + return ret; + } + + ret = of_dma_controller_register(pdev->dev.of_node, ldma_xlate, d); + if (ret) { + dev_err(dev, "Failed to register of DMA controller\n"); + dma_async_device_unregister(dma_dev); + return ret; + } + + dev_info(dev, "Init done - rev: %x, ports: %d channels: %d\n", d->ver, + d->port_nrs, d->chan_nrs); + + return 0; +} + +static struct platform_driver intel_ldma_driver = { + .probe = intel_ldma_probe, + .driver = { + .name = DRIVER_NAME, + .of_match_table = intel_ldma_match, + }, +}; + +static int __init intel_ldma_init(void) +{ + return platform_driver_register(&intel_ldma_driver); +} + +device_initcall(intel_ldma_init); diff --git a/include/linux/dma/lgm_dma.h b/include/linux/dma/lgm_dma.h new file mode 100644 index 000000000000..3a2ee6ad0710 --- /dev/null +++ b/include/linux/dma/lgm_dma.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2016 ~ 2019 Intel Corporation. + */ +#ifndef LGM_DMA_H +#define LGM_DMA_H + +#include +#include + +/*! + * \fn int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, + * int desc_num) + * \brief Configure low level channel descriptors + * \param[in] chan pointer to DMA channel that the client is using + * \param[in] desc_base descriptor base physical address + * \param[in] desc_num number of descriptors + * \return 0 on success + * \return kernel bug reported on failure + * + * This function configure the low level channel descriptors. It will be + * used by CBM whose descriptor is not DDR, actually some registers. + */ +int intel_dma_chan_desc_cfg(struct dma_chan *chan, dma_addr_t desc_base, + int desc_num); + +#endif /* LGM_DMA_H */ -- 2.11.0