Re: [PATCH v3 09/22] usb: chipidea: Add support for ULPI PHY bus

From: Peter Chen
Date: Thu Sep 01 2016 - 22:57:47 EST

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On Wed, Aug 31, 2016 at 05:40:23PM -0700, Stephen Boyd wrote:
> Some phys for the chipidea controller are controlled via the ULPI
> viewport. Add support for the ULPI bus so that these sorts of
> phys can be probed and read/written automatically without having
> to duplicate the viewport logic in each phy driver.
>
> Cc: Peter Chen <peter.chen@xxxxxxx>
> Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
> Cc: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> Signed-off-by: Stephen Boyd <stephen.boyd@xxxxxxxxxx>
> ---
> drivers/usb/chipidea/Kconfig | 7 +++
> drivers/usb/chipidea/Makefile | 1 +
> drivers/usb/chipidea/ci.h | 21 ++++++++
> drivers/usb/chipidea/core.c | 31 +++++++++---
> drivers/usb/chipidea/ulpi.c | 113 ++++++++++++++++++++++++++++++++++++++++++
> 5 files changed, 167 insertions(+), 6 deletions(-)
> create mode 100644 drivers/usb/chipidea/ulpi.c
>
> diff --git a/drivers/usb/chipidea/Kconfig b/drivers/usb/chipidea/Kconfig
> index 5e5b9eb7ebf6..19c20eaa23f2 100644
> --- a/drivers/usb/chipidea/Kconfig
> +++ b/drivers/usb/chipidea/Kconfig
> @@ -38,4 +38,11 @@ config USB_CHIPIDEA_HOST
> Say Y here to enable host controller functionality of the
> ChipIdea driver.
>
> +config USB_CHIPIDEA_ULPI
> + bool "ChipIdea ULPI PHY support"
> + depends on USB_ULPI_BUS=y || USB_ULPI_BUS=USB_CHIPIDEA
> + help
> + Say Y here if you have a ULPI PHY attached to your ChipIdea
> + controller.
> +
> endif
> diff --git a/drivers/usb/chipidea/Makefile b/drivers/usb/chipidea/Makefile
> index 518e445476c3..39fca5715ed3 100644
> --- a/drivers/usb/chipidea/Makefile
> +++ b/drivers/usb/chipidea/Makefile
> @@ -4,6 +4,7 @@ ci_hdrc-y := core.o otg.o debug.o
> ci_hdrc-$(CONFIG_USB_CHIPIDEA_UDC) += udc.o
> ci_hdrc-$(CONFIG_USB_CHIPIDEA_HOST) += host.o
> ci_hdrc-$(CONFIG_USB_OTG_FSM) += otg_fsm.o
> +ci_hdrc-$(CONFIG_USB_CHIPIDEA_ULPI) += ulpi.o
>
> # Glue/Bridge layers go here
>
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index 05bc4d631cb9..59e22389c10b 100644
> --- a/drivers/usb/chipidea/ci.h
> +++ b/drivers/usb/chipidea/ci.h
> @@ -18,6 +18,8 @@
> #include <linux/usb.h>
> #include <linux/usb/gadget.h>
> #include <linux/usb/otg-fsm.h>
> +#include <linux/usb/otg.h>
> +#include <linux/ulpi/interface.h>
>
> /******************************************************************************
> * DEFINE
> @@ -52,6 +54,7 @@ enum ci_hw_regs {
> OP_ENDPTLISTADDR,
> OP_TTCTRL,
> OP_BURSTSIZE,
> + OP_ULPI_VIEWPORT,
> OP_PORTSC,
> OP_DEVLC,
> OP_OTGSC,
> @@ -187,6 +190,8 @@ struct hw_bank {
> * @test_mode: the selected test mode
> * @platdata: platform specific information supplied by parent device
> * @vbus_active: is VBUS active
> + * @ulpi: pointer to ULPI device, if any
> + * @ulpi_ops: ULPI read/write ops for this device
> * @phy: pointer to PHY, if any
> * @usb_phy: pointer to USB PHY, if any and if using the USB PHY framework
> * @hcd: pointer to usb_hcd for ehci host driver
> @@ -236,6 +241,10 @@ struct ci_hdrc {
>
> struct ci_hdrc_platform_data *platdata;
> int vbus_active;
> +#ifdef CONFIG_USB_CHIPIDEA_ULPI
> + struct ulpi *ulpi;
> + struct ulpi_ops ulpi_ops;
> +#endif
> struct phy *phy;
> /* old usb_phy interface */
> struct usb_phy *usb_phy;
> @@ -418,6 +427,16 @@ static inline bool ci_otg_is_fsm_mode(struct ci_hdrc *ci)
> #endif
> }
>
> +#if IS_ENABLED(CONFIG_USB_CHIPIDEA_ULPI)
> +int ci_ulpi_init(struct ci_hdrc *ci);
> +void ci_ulpi_exit(struct ci_hdrc *ci);
> +int ci_ulpi_resume(struct ci_hdrc *ci);
> +#else
> +static inline int ci_ulpi_init(struct ci_hdrc *ci) { return 0; }
> +static inline void ci_ulpi_exit(struct ci_hdrc *ci) { }
> +static inline int ci_ulpi_resume(struct ci_hdrc *ci) { return 0; }
> +#endif
> +
> u32 hw_read_intr_enable(struct ci_hdrc *ci);
>
> u32 hw_read_intr_status(struct ci_hdrc *ci);
> @@ -428,6 +447,8 @@ int hw_port_test_set(struct ci_hdrc *ci, u8 mode);
>
> u8 hw_port_test_get(struct ci_hdrc *ci);
>
> +void hw_phymode_configure(struct ci_hdrc *ci);
> +
> void ci_platform_configure(struct ci_hdrc *ci);
>
> int dbg_create_files(struct ci_hdrc *ci);
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 532085a096d9..f144e1bbcc82 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -86,6 +86,7 @@ static const u8 ci_regs_nolpm[] = {
> [OP_ENDPTLISTADDR] = 0x18U,
> [OP_TTCTRL] = 0x1CU,
> [OP_BURSTSIZE] = 0x20U,
> + [OP_ULPI_VIEWPORT] = 0x30U,
> [OP_PORTSC] = 0x44U,
> [OP_DEVLC] = 0x84U,
> [OP_OTGSC] = 0x64U,
> @@ -110,6 +111,7 @@ static const u8 ci_regs_lpm[] = {
> [OP_ENDPTLISTADDR] = 0x18U,
> [OP_TTCTRL] = 0x1CU,
> [OP_BURSTSIZE] = 0x20U,
> + [OP_ULPI_VIEWPORT] = 0x30U,
> [OP_PORTSC] = 0x44U,
> [OP_DEVLC] = 0x84U,
> [OP_OTGSC] = 0xC4U,
> @@ -285,7 +287,7 @@ static int hw_device_init(struct ci_hdrc *ci, void __iomem *base)
> return 0;
> }
>
> -static void hw_phymode_configure(struct ci_hdrc *ci)
> +void hw_phymode_configure(struct ci_hdrc *ci)
> {
> u32 portsc, lpm, sts = 0;
>
> @@ -894,6 +896,7 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> CI_HDRC_IMX28_WRITE_FIX);
> ci->supports_runtime_pm = !!(ci->platdata->flags &
> CI_HDRC_SUPPORTS_RUNTIME_PM);
> + platform_set_drvdata(pdev, ci);
>
> ret = hw_device_init(ci, base);
> if (ret < 0) {
> @@ -901,6 +904,10 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> return -ENODEV;
> }
>
> + ret = ci_ulpi_init(ci);
> + if (ret)
> + return ret;
> +
> if (ci->platdata->phy) {
> ci->phy = ci->platdata->phy;
> } else if (ci->platdata->usb_phy) {
> @@ -911,11 +918,15 @@ static int ci_hdrc_probe(struct platform_device *pdev)
>
> /* if both generic PHY and USB PHY layers aren't enabled */
> if (PTR_ERR(ci->phy) == -ENOSYS &&
> - PTR_ERR(ci->usb_phy) == -ENXIO)
> - return -ENXIO;
> + PTR_ERR(ci->usb_phy) == -ENXIO) {
> + ret = -ENXIO;
> + goto ulpi_exit;
> + }
>
> - if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy))
> - return -EPROBE_DEFER;
> + if (IS_ERR(ci->phy) && IS_ERR(ci->usb_phy)) {
> + ret = -EPROBE_DEFER;
> + goto ulpi_exit;
> + }
>
> if (IS_ERR(ci->phy))
> ci->phy = NULL;
> @@ -1000,7 +1011,6 @@ static int ci_hdrc_probe(struct platform_device *pdev)
> }
> }
>
> - platform_set_drvdata(pdev, ci);
> ret = devm_request_irq(dev, ci->irq, ci_irq, IRQF_SHARED,
> ci->platdata->name, ci);
> if (ret)
> @@ -1032,6 +1042,8 @@ stop:
> ci_role_destroy(ci);
> deinit_phy:
> ci_usb_phy_exit(ci);
> +ulpi_exit:
> + ci_ulpi_exit(ci);
>
> return ret;
> }
> @@ -1051,6 +1063,7 @@ static int ci_hdrc_remove(struct platform_device *pdev)
> ci_role_destroy(ci);
> ci_hdrc_enter_lpm(ci, true);
> ci_usb_phy_exit(ci);
> + ci_ulpi_exit(ci);
>
> return 0;
> }
> @@ -1098,6 +1111,7 @@ static void ci_controller_suspend(struct ci_hdrc *ci)
> static int ci_controller_resume(struct device *dev)
> {
> struct ci_hdrc *ci = dev_get_drvdata(dev);
> + int ret;
>
> dev_dbg(dev, "at %s\n", __func__);
>
> @@ -1107,6 +1121,11 @@ static int ci_controller_resume(struct device *dev)
> }
>
> ci_hdrc_enter_lpm(ci, false);
> +
> + ret = ci_ulpi_resume(ci);
> + if (ret)
> + return ret;
> +
> if (ci->usb_phy) {
> usb_phy_set_suspend(ci->usb_phy, 0);
> usb_phy_set_wakeup(ci->usb_phy, false);
> diff --git a/drivers/usb/chipidea/ulpi.c b/drivers/usb/chipidea/ulpi.c
> new file mode 100644
> index 000000000000..3962255ff687
> --- /dev/null
> +++ b/drivers/usb/chipidea/ulpi.c
> @@ -0,0 +1,113 @@
> +/*
> + * Copyright (c) 2016 Linaro Ltd.
> + *
> + * This software is licensed under the terms of the GNU General Public
> + * License version 2, as published by the Free Software Foundation, and
> + * may be copied, distributed, and modified under those terms.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + */
> +
> +#include <linux/device.h>
> +#include <linux/usb/chipidea.h>
> +#include <linux/ulpi/interface.h>
> +
> +#include "ci.h"
> +
> +#define ULPI_WAKEUP BIT(31)
> +#define ULPI_RUN BIT(30)
> +#define ULPI_WRITE BIT(29)
> +#define ULPI_SYNC_STATE BIT(27)
> +#define ULPI_ADDR(n) ((n) << 16)
> +#define ULPI_DATA(n) (n)
> +
> +static int ci_ulpi_wait(struct ci_hdrc *ci, u32 mask)
> +{
> + unsigned long usec = 10000;
> +
> + while (usec--) {
> + if (!hw_read(ci, OP_ULPI_VIEWPORT, mask))
> + return 0;
> +
> + udelay(1);
> + }
> +
> + return -ETIMEDOUT;
> +}
> +
> +static int ci_ulpi_read(struct ulpi_ops *ops, u8 addr)
> +{
> + struct ci_hdrc *ci = dev_get_drvdata(ops->dev);
> + int ret;
> +
> + hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
> + ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
> + if (ret)
> + return ret;
> +
> + hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_RUN | ULPI_ADDR(addr));
> + ret = ci_ulpi_wait(ci, ULPI_RUN);
> + if (ret)
> + return ret;
> +
> + return hw_read(ci, OP_ULPI_VIEWPORT, GENMASK(15, 8)) >> 8;
> +}
> +
> +static int ci_ulpi_write(struct ulpi_ops *ops, u8 addr, u8 val)
> +{
> + struct ci_hdrc *ci = dev_get_drvdata(ops->dev);
> + int ret;
> +
> + hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff, ULPI_WRITE | ULPI_WAKEUP);
> + ret = ci_ulpi_wait(ci, ULPI_WAKEUP);
> + if (ret)
> + return ret;
> +
> + hw_write(ci, OP_ULPI_VIEWPORT, 0xffffffff,
> + ULPI_RUN | ULPI_WRITE | ULPI_ADDR(addr) | val);
> + return ci_ulpi_wait(ci, ULPI_RUN);
> +}
> +
> +int ci_ulpi_init(struct ci_hdrc *ci)
> +{
> + if (ci->platdata->phy_mode != USBPHY_INTERFACE_MODE_ULPI)
> + return 0;
> +
> + /*
> + * Set PORTSC correctly so we can read/write ULPI registers for
> + * identification purposes
> + */
> + hw_phymode_configure(ci);
> +
> + ci->ulpi_ops.read = ci_ulpi_read;
> + ci->ulpi_ops.write = ci_ulpi_write;
> + ci->ulpi = ulpi_register_interface(ci->dev, &ci->ulpi_ops);
> + if (IS_ERR(ci->ulpi))
> + dev_err(ci->dev, "failed to register ULPI interface");
> +
> + return PTR_ERR_OR_ZERO(ci->ulpi);
> +}
> +
> +void ci_ulpi_exit(struct ci_hdrc *ci)
> +{
> + if (ci->ulpi) {
> + ulpi_unregister_interface(ci->ulpi);
> + ci->ulpi = NULL;
> + }
> +}
> +
> +int ci_ulpi_resume(struct ci_hdrc *ci)
> +{
> + int cnt = 100000;
> +
> + while (cnt-- > 0) {
> + if (hw_read(ci, OP_ULPI_VIEWPORT, ULPI_SYNC_STATE))
> + return 0;
> + udelay(1);
> + }
> +
> + return -ETIMEDOUT;
> +}
> --

Acked-by: Peter Chen <peter.chen@xxxxxxx>

--

Best Regards,
Peter Chen

Next message: Ross Zwisler: "Re: DAX can not work on virtual nvdimm device"
Previous message: Peter Chen: "Re: [PATCH v3 04/22] usb: chipidea: Only read/write OTGSC from one place"
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