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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=TlTEIUk5RGdmKwnQ8TFwBDd7eqxl4e/D207nujMhGlc=; b=nBVsyxlwYi1hUoaJuH0Z7eP7zH8Txz9OoCPKiT0Vy7i0pvWu19NV+PD0URY7b2SjuL QzfetEvS+V8xXIThuVaeQs0vQekBjSFLebuPhdy43s/puZA5k7lyJVqIMOaMsr4Uqy30 JazAl9IZvYevNGSm6mQ5N35XxQAs26Xkx6zF3I5U/gJWQUvk/7j/Z+GZzV44yHDtsNwt uUBJIPaYNB7vJ0LhvYDlYLlR5M2KyZRnsjt3p3BlmWgsk7rVVHmUuhc1Th/WuzMGQ54p pEnFLiFPtd0F3pvCvyhS3aWZF4mJIomyj4rcPg0VvS6oKfYFVz62Tq4RKnK3Lywkl8D4 QxRA== X-Gm-Message-State: AA+aEWZaKJjVTCLvlZIxP+634cN/6LpwHuBERhlvADUEE25CuNF/gfN/ fLNw+SlJ/8ih1NCljYzRk/1LeZqdm9/1KCwj3ss= X-Google-Smtp-Source: AFSGD/WRoEhip7yaVyljTnwUJrQWXtAsFwUT0wMx+xMoRWnHIijhZymFWdnpZGitA8VT+vq7n0OSy/71uDgFhaEhTr0= X-Received: by 2002:a5d:8989:: with SMTP id m9mr6813238iol.216.1543915140615; Tue, 04 Dec 2018 01:19:00 -0800 (PST) MIME-Version: 1.0 References: <1542535751-16079-1-git-send-email-pawell@cadence.com> <1542535751-16079-6-git-send-email-pawell@cadence.com> In-Reply-To: <1542535751-16079-6-git-send-email-pawell@cadence.com> From: Peter Chen Date: Tue, 4 Dec 2018 17:18:47 +0800 Message-ID: Subject: Re: [RFC PATCH v2 05/15] usb:cdns3: Added DRD support To: pawell@cadence.com Cc: devicetree@vger.kernel.org, Greg Kroah-Hartman , linux-usb@vger.kernel.org, rogerq@ti.com, lkml , adouglas@cadence.com, jbergsagel@ti.com, nsekhar@ti.com, nm@ti.com, sureshp@cadence.com, peter.chen@nxp.com, pjez@cadence.com, kurahul@cadence.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Nov 18, 2018 at 6:13 PM Pawel Laszczak wrote: > > Patch adds supports for detecting Host/Device mode. > Controller has additional OTG register that allow > implement even whole OTG functionality. > At this moment patch adds support only for detecting > the appropriate mode based on strap pins and ID pin. > > Signed-off-by: Pawel Laszczak > --- > drivers/usb/cdns3/Makefile | 2 +- > drivers/usb/cdns3/core.c | 27 +++-- > drivers/usb/cdns3/drd.c | 229 +++++++++++++++++++++++++++++++++++++ > drivers/usb/cdns3/drd.h | 122 ++++++++++++++++++++ > 4 files changed, 372 insertions(+), 8 deletions(-) > create mode 100644 drivers/usb/cdns3/drd.c > create mode 100644 drivers/usb/cdns3/drd.h > > diff --git a/drivers/usb/cdns3/Makefile b/drivers/usb/cdns3/Makefile > index 02d25b23c5d3..e779b2a2f8eb 100644 > --- a/drivers/usb/cdns3/Makefile > +++ b/drivers/usb/cdns3/Makefile > @@ -1,5 +1,5 @@ > obj-$(CONFIG_USB_CDNS3) += cdns3.o > obj-$(CONFIG_USB_CDNS3_PCI_WRAP) += cdns3-pci.o > > -cdns3-y := core.o > +cdns3-y := core.o drd.o > cdns3-pci-y := cdns3-pci-wrap.o > diff --git a/drivers/usb/cdns3/core.c b/drivers/usb/cdns3/core.c > index f9055d4da67f..dbee4325da7f 100644 > --- a/drivers/usb/cdns3/core.c > +++ b/drivers/usb/cdns3/core.c > @@ -17,6 +17,7 @@ > > #include "gadget.h" > #include "core.h" > +#include "drd.h" > > static inline struct cdns3_role_driver *cdns3_get_current_role_driver(struct cdns3 *cdns) > { > @@ -57,8 +58,10 @@ static inline void cdns3_role_stop(struct cdns3 *cdns) > static enum cdns3_roles cdns3_get_role(struct cdns3 *cdns) > { > if (cdns->roles[CDNS3_ROLE_HOST] && cdns->roles[CDNS3_ROLE_GADGET]) { > - //TODO: implements selecting device/host mode > - return CDNS3_ROLE_HOST; > + if (cdns3_is_host(cdns)) > + return CDNS3_ROLE_HOST; > + if (cdns3_is_device(cdns)) > + return CDNS3_ROLE_GADGET; > } > return cdns->roles[CDNS3_ROLE_HOST] > ? CDNS3_ROLE_HOST > @@ -124,6 +127,12 @@ static irqreturn_t cdns3_irq(int irq, void *data) > struct cdns3 *cdns = data; > irqreturn_t ret = IRQ_NONE; > > + if (cdns->dr_mode == USB_DR_MODE_OTG) { > + ret = cdns3_drd_irq(cdns); > + if (ret == IRQ_HANDLED) > + return ret; > + } > + > /* Handle device/host interrupt */ > if (cdns->role != CDNS3_ROLE_END) > ret = cdns3_get_current_role_driver(cdns)->irq(cdns); > @@ -176,11 +185,8 @@ static void cdns3_role_switch(struct work_struct *work) > > cdns = container_of(work, struct cdns3, role_switch_wq); > > - //TODO: implements this functions. > - //host = cdns3_is_host(cdns); > - //device = cdns3_is_device(cdns); > - host = 1; > - device = 0; > + host = cdns3_is_host(cdns); > + device = cdns3_is_device(cdns); > > if (host) > role = CDNS3_ROLE_HOST; > @@ -194,6 +200,12 @@ static void cdns3_role_switch(struct work_struct *work) > pm_runtime_get_sync(cdns->dev); > cdns3_role_stop(cdns); > > + if (cdns->desired_dr_mode != cdns->current_dr_mode) { > + cdns3_drd_update_mode(cdns); > + host = cdns3_is_host(cdns); > + device = cdns3_is_device(cdns); > + } > + > if (host) { > if (cdns->roles[CDNS3_ROLE_HOST]) > cdns3_do_role_switch(cdns, CDNS3_ROLE_HOST); > @@ -287,6 +299,7 @@ static int cdns3_probe(struct platform_device *pdev) > if (ret) > goto err2; > > + ret = cdns3_drd_init(cdns); > if (ret) > goto err2; > > diff --git a/drivers/usb/cdns3/drd.c b/drivers/usb/cdns3/drd.c > new file mode 100644 > index 000000000000..ac741c80e776 > --- /dev/null > +++ b/drivers/usb/cdns3/drd.c > @@ -0,0 +1,229 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Cadence USBSS DRD Driver. > + * > + * Copyright (C) 2018 Cadence. > + * > + * Author: Pawel Laszczak + * > + */ > +#include > +#include > +#include > +#include > + > +#include "gadget.h" > +#include "drd.h" > + > +/** > + * cdns3_set_mode - change mode of OTG Core > + * @cdns: pointer to context structure > + * @mode: selected mode from cdns_role > + */ > +void cdns3_set_mode(struct cdns3 *cdns, enum usb_dr_mode mode) > +{ > + u32 reg; > + > + cdns->current_dr_mode = mode; > + switch (mode) { > + case USB_DR_MODE_PERIPHERAL: > + dev_info(cdns->dev, "Set controller to Gadget mode\n"); > + writel(OTGCMD_DEV_BUS_REQ | OTGCMD_OTG_DIS, > + &cdns->otg_regs->cmd); > + break; > + case USB_DR_MODE_HOST: > + dev_info(cdns->dev, "Set controller to Host mode\n"); > + writel(OTGCMD_HOST_BUS_REQ | OTGCMD_OTG_DIS, > + &cdns->otg_regs->cmd); > + break; > + case USB_DR_MODE_OTG: > + dev_info(cdns->dev, "Set controller to OTG mode\n"); > + reg = readl(&cdns->otg_regs->ctrl1); > + reg |= OTGCTRL1_IDPULLUP; > + writel(reg, &cdns->otg_regs->ctrl1); > + > + /* wait until valid ID (ID_VALUE) can be sampled (50ms). */ > + mdelay(50); Usually, each big delay needs well documentation, eg, from hardware's documentation. And use sleep delay, eg, msleep or usleep_range. > + break; > + default: > + cdns->current_dr_mode = USB_DR_MODE_UNKNOWN; > + dev_err(cdns->dev, "Unsupported mode of operation %d\n", mode); > + return; > + } > +} > + > +static int cdns3_otg_get_id(struct cdns3 *cdns) > +{ > + int id; > + > + id = readl(&cdns->otg_regs->sts) & OTGSTS_ID_VALUE; > + dev_dbg(cdns->dev, "OTG ID: %d", id); > + return id; > +} > + > +int cdns3_is_host(struct cdns3 *cdns) > +{ > + if (cdns->current_dr_mode == USB_DR_MODE_HOST) > + return 1; > + else if (cdns->current_dr_mode == USB_DR_MODE_OTG) > + if (!cdns3_otg_get_id(cdns)) > + return 1; > + > + return 0; > +} > + > +int cdns3_is_device(struct cdns3 *cdns) > +{ > + if (cdns->current_dr_mode == USB_DR_MODE_PERIPHERAL) > + return 1; > + else if (cdns->current_dr_mode == USB_DR_MODE_OTG) > + if (cdns3_otg_get_id(cdns)) > + return 1; > + > + return 0; > +} > + You could move above into cdns_get_role. > +/** > + * cdns3_otg_disable_irq - Disable all OTG interrupts > + * @cdns: Pointer to controller context structure > + */ > +static void cdns3_otg_disable_irq(struct cdns3 *cdns) > +{ > + writel(0, &cdns->otg_regs->ien); > +} > + > +/** > + * cdns3_otg_enable_irq - enable id and sess_valid interrupts > + * @cdns: Pointer to controller context structure > + */ > +static void cdns3_otg_enable_irq(struct cdns3 *cdns) > +{ > + writel(OTGIEN_ID_CHANGE_INT | OTGIEN_VBUSVALID_RISE_INT | > + OTGIEN_VBUSVALID_FALL_INT, &cdns->otg_regs->ien); > +} > + > +/** > + * cdns3_init_otg_mode - initialize drd controller > + * @cdns: Pointer to controller context structure > + * > + * Returns 0 on success otherwise negative errno > + */ > +static void cdns3_init_otg_mode(struct cdns3 *cdns) > +{ > + cdns3_otg_disable_irq(cdns); > + /* clear all interrupts */ > + writel(~0, &cdns->otg_regs->ivect); > + > + cdns3_set_mode(cdns, USB_DR_MODE_OTG); > + > + cdns3_otg_enable_irq(cdns); > +} > + > +/** > + * cdns3_drd_update_mode - initialize mode of operation > + * @cdns: Pointer to controller context structure > + * > + * Returns 0 on success otherwise negative errno > + */ > +int cdns3_drd_update_mode(struct cdns3 *cdns) > +{ > + int ret = 0; > + > + switch (cdns->desired_dr_mode) { > + case USB_DR_MODE_PERIPHERAL: > + cdns3_set_mode(cdns, USB_DR_MODE_PERIPHERAL); > + break; > + case USB_DR_MODE_HOST: > + cdns3_set_mode(cdns, USB_DR_MODE_HOST); > + break; > + case USB_DR_MODE_OTG: > + cdns3_init_otg_mode(cdns); > + break; > + default: > + dev_err(cdns->dev, "Unsupported mode of operation %d\n", > + cdns->dr_mode); > + return -EINVAL; > + } > + > + return ret; > +} > + > +irqreturn_t cdns3_drd_irq(struct cdns3 *cdns) > +{ > + irqreturn_t ret = IRQ_NONE; > + u32 reg; > + > + if (cdns->dr_mode != USB_DR_MODE_OTG) > + return ret; > + > + reg = readl(&cdns->otg_regs->ivect); > + if (!reg) > + return ret; > + > + if (reg & OTGIEN_ID_CHANGE_INT) { > + int id = cdns3_otg_get_id(cdns); > + > + dev_dbg(cdns->dev, "OTG IRQ: new ID: %d\n", > + cdns3_otg_get_id(cdns)); > + > + if (id) > + cdns->role = CDNS3_ROLE_GADGET; > + else > + cdns->role = CDNS3_ROLE_HOST; > + > + queue_work(system_freezable_wq, &cdns->role_switch_wq); > + > + ret = IRQ_HANDLED; > + } > + > + writel(~0, &cdns->otg_regs->ivect); > + return IRQ_HANDLED; > +} > + > +int cdns3_drd_init(struct cdns3 *cdns) > +{ > + enum usb_dr_mode dr_mode; > + int ret = 0; > + u32 state; > + > + state = OTGSTS_STRAP(readl(&cdns->otg_regs->sts)); > + > + dr_mode = cdns->dr_mode; > + if (state == OTGSTS_STRAP_HOST) { > + dev_info(cdns->dev, "Controller strapped to HOST\n"); > + dr_mode = USB_DR_MODE_HOST; > + if (cdns->dr_mode != USB_DR_MODE_HOST && > + cdns->dr_mode != USB_DR_MODE_OTG) > + ret = -EINVAL; > + } else if (state == OTGSTS_STRAP_GADGET) { > + dev_info(cdns->dev, "Controller strapped to PERIPHERAL\n"); > + dr_mode = USB_DR_MODE_PERIPHERAL; > + if (cdns->dr_mode != USB_DR_MODE_PERIPHERAL && > + cdns->dr_mode != USB_DR_MODE_OTG) > + ret = -EINVAL; > + } > + > + if (ret) { > + dev_err(cdns->dev, "Incorrect DRD configuration\n"); > + return ret; > + } > + > + //Updating DR mode according to strap. > + cdns->dr_mode = dr_mode; > + cdns->desired_dr_mode = dr_mode; > + cdns->current_dr_mode = USB_DR_MODE_UNKNOWN; > + > + dev_info(cdns->dev, "Controller Device ID: %08lx, Revision ID: %08lx\n", > + CDNS_RID(readl(&cdns->otg_regs->rid)), > + CDNS_DID(readl(&cdns->otg_regs->did))); > + > + state = readl(&cdns->otg_regs->sts); > + if (OTGSTS_OTG_NRDY(state) != 0) { > + dev_err(cdns->dev, "Cadence USB3 OTG device not ready\n"); > + return -ENODEV; > + } > + > + ret = cdns3_drd_update_mode(cdns); > + > + return ret; > +} > diff --git a/drivers/usb/cdns3/drd.h b/drivers/usb/cdns3/drd.h > new file mode 100644 > index 000000000000..0faa7520ecac > --- /dev/null > +++ b/drivers/usb/cdns3/drd.h > @@ -0,0 +1,122 @@ > +/* SPDX-License-Identifier: GPL-2.0 */ > +/* > + * Cadence USB3 DRD part of USBSS driver Header file Peter > + * > + * Copyright (C) 2018 Cadence. > + * > + * Author: Pawel Laszczak > + */ > +#ifndef __LINUX_CDNS3_DRD > +#define __LINUX_CDNS3_DRD > + > +#include > +#include > +#include "core.h" > + > +/* DRD register interface. */ > +struct cdns3_otg_regs { > + __le32 did; > + __le32 rid; > + __le32 capabilities; > + __le32 reserved1; > + __le32 cmd; > + __le32 sts; > + __le32 state; > + __le32 reserved2; > + __le32 ien; > + __le32 ivect; > + __le32 refclk; > + __le32 tmr; > + __le32 reserved3[4]; > + __le32 simulate; > + __le32 override; > + __le32 susp_ctrl; > + __le32 reserved4; > + __le32 anasts; > + __le32 adp_ramp_time; > + __le32 ctrl1; > + __le32 ctrl2; > +}; > + > +/* CDNS_RID - bitmasks */ > +#define CDNS_RID(p) ((p) & GENMASK(15, 0)) > + > +/* CDNS_VID - bitmasks */ > +#define CDNS_DID(p) ((p) & GENMASK(31, 0)) > + > +/* OTGCMD - bitmasks */ > +/* "Request the bus for Device mode. */ > +#define OTGCMD_DEV_BUS_REQ BIT(0) > +/* Request the bus for Host mode */ > +#define OTGCMD_HOST_BUS_REQ BIT(1) > +/* Enable OTG mode. */ > +#define OTGCMD_OTG_EN BIT(2) > +/* Disable OTG mode */ > +#define OTGCMD_OTG_DIS BIT(3) > +/*"Configure OTG as A-Device. */ > +#define OTGCMD_A_DEV_EN BIT(4) > +/*"Configure OTG as A-Device. */ > +#define OTGCMD_A_DEV_DIS BIT(5) > +/* Drop the bus for Device mod e. */ > +#define OTGCMD_DEV_BUS_DROP BIT(8) > +/* Drop the bus for Host mode*/ > +#define OTGCMD_HOST_BUS_DROP BIT(9) > +/* Power Down USBSS-DEV. */ > +#define OTGCMD_DEV_POWER_OFF BIT(11) > +/* Power Down CDNSXHCI. */ > +#define OTGCMD_HOST_POWER_OFF BIT(12) > + > +/* OTGIEN - bitmasks */ > +/* ID change interrupt enable */ > +#define OTGIEN_ID_CHANGE_INT BIT(0) > +/* Vbusvalid fall detected interrupt enable.*/ > +#define OTGIEN_VBUSVALID_RISE_INT BIT(4) > +/* Vbusvalid fall detected interrupt enable */ > +#define OTGIEN_VBUSVALID_FALL_INT BIT(5) > + > +/* OTGSTS - bitmasks */ > +/* > + * Current value of the ID pin. It is only valid when idpullup in > + * OTGCTRL1_TYPE register is set to '1'. > + */ > +#define OTGSTS_ID_VALUE BIT(0) > +/* Current value of the vbus_valid */ > +#define OTGSTS_VBUS_VALID BIT(1) > +/* Current value of the b_sess_vld */ > +#define OTGSTS_SESSION_VALID BIT(2) > +/*Device mode is active*/ > +#define OTGSTS_DEV_ACTIVE BIT(3) > +/* Host mode is active. */ > +#define OTGSTS_HOST_ACTIVE BIT(4) > +/* OTG Controller not ready. */ > +#define OTGSTS_OTG_NRDY_MASK BIT(11) > +#define OTGSTS_OTG_NRDY(p) ((p) & OTGSTS_OTG_NRDY_MASK) > +/* > + * Value of the strap pins. > + * 000 - no default configuration > + * 010 - Controller initiall configured as Host > + * 100 - Controller initially configured as Device > + */ > +#define OTGSTS_STRAP(p) (((p) & GENMASK(14, 12)) >> 12) > +#define OTGSTS_STRAP_NO_DEFAULT_CFG 0x00 > +#define OTGSTS_STRAP_HOST_OTG 0x01 > +#define OTGSTS_STRAP_HOST 0x02 > +#define OTGSTS_STRAP_GADGET 0x04 > +/* Host mode is turned on. */ > +#define OTGSTSE_XHCI_READYF BIT(26) > +/* "Device mode is turned on .*/ > +#define OTGSTS_DEV_READY BIT(27) > + > +/* OTGREFCLK - bitmasks */ > +#define OTGREFCLK_STB_CLK_SWITCH_EN BIT(31) > + > +/* OTGCTRL1 - bitmasks */ > +#define OTGCTRL1_IDPULLUP BIT(24) > + > +int cdns3_is_host(struct cdns3 *cdns); > +int cdns3_is_device(struct cdns3 *cdns); > +int cdns3_drd_init(struct cdns3 *cdns); > +int cdns3_drd_update_mode(struct cdns3 *cdns); > +irqreturn_t cdns3_drd_irq(struct cdns3 *cdns); > + > +#endif /* __LINUX_CDNS3_DRD */ > -- > 2.17.1 > From mboxrd@z Thu Jan 1 00:00:00 1970 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: base64 Subject: [RFC,v2,05/15] usb:cdns3: Added DRD support From: Peter Chen Message-Id: Date: Tue, 4 Dec 2018 17:18:47 +0800 To: pawell@cadence.com Cc: devicetree@vger.kernel.org, Greg Kroah-Hartman , linux-usb@vger.kernel.org, rogerq@ti.com, lkml , adouglas@cadence.com, jbergsagel@ti.com, nsekhar@ti.com, nm@ti.com, 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