Hi,
On Fri, Jun 13, 2014 at 09:20:31PM +0900, Yoshihiro Shimoda wrote:
> The R-Car H2 and M2 SoCs come with an xHCI controller that requires
> some specific initializations related to the firmware downloading and
> some specific registers. This patch adds the support for this special
> configuration as an xHCI quirk executed during probe and start.
>
> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
> ---
> drivers/usb/host/Kconfig | 8 +++
> drivers/usb/host/Makefile | 3 +
> drivers/usb/host/xhci-plat.c | 19 ++++++
> drivers/usb/host/xhci-rcar.c | 148 ++++++++++++++++++++++++++++++++++++++++++
> drivers/usb/host/xhci-rcar.h | 27 ++++++++
> 5 files changed, 205 insertions(+)
> create mode 100644 drivers/usb/host/xhci-rcar.c
> create mode 100644 drivers/usb/host/xhci-rcar.h
>
> diff --git a/drivers/usb/host/Kconfig b/drivers/usb/host/Kconfig
> index 61b7817..537d9e1 100644
> --- a/drivers/usb/host/Kconfig
> +++ b/drivers/usb/host/Kconfig
> @@ -37,6 +37,14 @@ config USB_XHCI_MVEBU
> Say 'Y' to enable the support for the xHCI host controller
> found in Marvell Armada 375/38x ARM SOCs.
>
> +config USB_XHCI_RCAR
> + tristate "xHCI support for Renesas R-Car SoCs"
> + select USB_XHCI_PLATFORM
> + depends on ARCH_SHMOBILE || COMPILE_TEST
> + ---help---
> + Say 'Y' to enable the support for the xHCI host controller
> + found in Renesas R-Car ARM SoCs.
> +
> endif # USB_XHCI_HCD
>
> config USB_EHCI_HCD
> diff --git a/drivers/usb/host/Makefile b/drivers/usb/host/Makefile
> index af89a90..144c038 100644
> --- a/drivers/usb/host/Makefile
> +++ b/drivers/usb/host/Makefile
> @@ -22,6 +22,9 @@ ifneq ($(CONFIG_USB_XHCI_PLATFORM), )
> ifneq ($(CONFIG_USB_XHCI_MVEBU), )
> xhci-hcd-y += xhci-mvebu.o
> endif
> +ifneq ($(CONFIG_USB_XHCI_RCAR), )
> + xhci-hcd-y += xhci-rcar.o
> +endif
> endif
>
> obj-$(CONFIG_USB_WHCI_HCD) += whci/
> diff --git a/drivers/usb/host/xhci-plat.c b/drivers/usb/host/xhci-plat.c
> index 29d8adb..b6f2b6b 100644
> --- a/drivers/usb/host/xhci-plat.c
> +++ b/drivers/usb/host/xhci-plat.c
> @@ -20,6 +20,7 @@
>
> #include "xhci.h"
> #include "xhci-mvebu.h"
> +#include "xhci-rcar.h"
>
> static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
> {
> @@ -34,11 +35,27 @@ static void xhci_plat_quirks(struct device *dev, struct xhci_hcd *xhci)
> /* called during probe() after chip reset completes */
> static int xhci_plat_setup(struct usb_hcd *hcd)
> {
> + struct device_node *of_node = hcd->self.controller->of_node;
> + int ret;
> +
> + if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
> + of_device_is_compatible(of_node, "renesas,xhci-r8a7791")) {
> + ret = xhci_rcar_init_quirk(hcd);
> + if (ret)
> + return ret;
> + }
> +
> return xhci_gen_setup(hcd, xhci_plat_quirks);
> }
>
> static int xhci_plat_start(struct usb_hcd *hcd)
> {
> + struct device_node *of_node = hcd->self.controller->of_node;
> +
> + if (of_device_is_compatible(of_node, "renesas,xhci-r8a7790") ||
> + of_device_is_compatible(of_node, "renesas,xhci-r8a7791"))
> + xhci_rcar_start(hcd);
> +
> return xhci_run(hcd);
> }
>
> @@ -270,6 +287,8 @@ static const struct of_device_id usb_xhci_of_match[] = {
> { .compatible = "xhci-platform" },
> { .compatible = "marvell,armada-375-xhci"},
> { .compatible = "marvell,armada-380-xhci"},
> + { .compatible = "renesas,xhci-r8a7790"},
> + { .compatible = "renesas,xhci-r8a7791"},
> { },
> };
> MODULE_DEVICE_TABLE(of, usb_xhci_of_match);
> diff --git a/drivers/usb/host/xhci-rcar.c b/drivers/usb/host/xhci-rcar.c
> new file mode 100644
> index 0000000..ff0d1b4
> --- /dev/null
> +++ b/drivers/usb/host/xhci-rcar.c
> @@ -0,0 +1,148 @@
> +/*
> + * xHCI host controller driver for R-Car SoCs
> + *
> + * Copyright (C) 2014 Renesas Electronics Corporation
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * version 2 as published by the Free Software Foundation.
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/usb/phy.h>
> +
> +#include "xhci.h"
> +#include "xhci-rcar.h"
> +
> +#define FIRMWARE_NAME "r8a779x_usb3_v1.dlmem"
> +MODULE_FIRMWARE(FIRMWARE_NAME);
> +
> +/*** Register Offset ***/
> +#define RCAR_USB3_INT_ENA 0x224 /* Interrupt Enable */
> +#define RCAR_USB3_DL_CTRL 0x250 /* FW Download Control & Status */
> +#define RCAR_USB3_FW_DATA0 0x258 /* FW Data0 */
> +
> +#define RCAR_USB3_LCLK 0xa44 /* LCLK Select */
> +#define RCAR_USB3_CONF1 0xa48 /* USB3.0 Configuration1 */
> +#define RCAR_USB3_CONF2 0xa5c /* USB3.0 Configuration2 */
> +#define RCAR_USB3_CONF3 0xaa8 /* USB3.0 Configuration3 */
> +#define RCAR_USB3_RX_POL 0xab0 /* USB3.0 RX Polarity */
> +#define RCAR_USB3_TX_POL 0xab8 /* USB3.0 TX Polarity */
> +
> +/*** Register Settings ***/
> +/* Interrupt Enable */
> +#define RCAR_USB3_INT_XHC_ENA 0x00000001
> +#define RCAR_USB3_INT_PME_ENA 0x00000002
> +#define RCAR_USB3_INT_HSE_ENA 0x00000004
> +#define RCAR_USB3_INT_ENA_VAL (RCAR_USB3_INT_XHC_ENA | \
> + RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
> +
> +/* FW Download Control & Status */
> +#define RCAR_USB3_DL_CTRL_ENABLE 0x00000001
> +#define RCAR_USB3_DL_CTRL_FW_SUCCESS 0x00000010
> +#define RCAR_USB3_DL_CTRL_FW_SET_DATA0 0x00000100
> +
> +/* LCLK Select */
> +#define RCAR_USB3_LCLK_ENA_VAL 0x01030001
> +
> +/* USB3.0 Configuration */
> +#define RCAR_USB3_CONF1_VAL 0x00030204
> +#define RCAR_USB3_CONF2_VAL 0x00030300
> +#define RCAR_USB3_CONF3_VAL 0x13802007
> +
> +/* USB3.0 Polarity */
> +#define RCAR_USB3_RX_POL_VAL BIT(21)
> +#define RCAR_USB3_TX_POL_VAL BIT(4)
> +
> +void xhci_rcar_start(struct usb_hcd *hcd)
> +{
> + u32 temp;
> +
> + if (hcd->regs != NULL) {
> + /* Interrupt Enable */
> + temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
> + temp |= RCAR_USB3_INT_ENA_VAL;
> + writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
> + /* LCLK Select */
> + writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
> + /* USB3.0 Configuration */
> + writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
> + writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
> + writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
> + /* USB3.0 Polarity */
> + writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
> + writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
> + }
> +}
> +
> +static int xhci_rcar_download_firmware(struct device *dev, void __iomem *regs)
> +{
> + const struct firmware *fw;
> + int retval, index, j, time;
> + int timeout = 10000;
> + u32 data, val, temp;
> +
> + /* request R-Car USB3.0 firmware */
> + retval = request_firmware(&fw, FIRMWARE_NAME, dev);
> + if (retval)
> + return retval;
> +
> + /* download R-Car USB3.0 firmware */
> + temp = readl(regs + RCAR_USB3_DL_CTRL);
> + temp |= RCAR_USB3_DL_CTRL_ENABLE;
> + writel(temp, regs + RCAR_USB3_DL_CTRL);
> +
> + for (index = 0; index < fw->size; index += 4) {
> + /* to avoid reading beyond the end of the buffer */
> + for (data = 0, j = 3; j >= 0; j--) {
> + if ((j + index) < fw->size)
> + data |= fw->data[index + j] << (8 * j);
> + }
> + writel(data, regs + RCAR_USB3_FW_DATA0);
> + temp = readl(regs + RCAR_USB3_DL_CTRL);
> + temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
> + writel(temp, regs + RCAR_USB3_DL_CTRL);
> +
> + for (time = 0; time < timeout; time++) {
> + val = readl(regs + RCAR_USB3_DL_CTRL);
> + if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
> + break;
> + udelay(1);
> + }
> + if (time == timeout) {
> + retval = -ETIMEDOUT;
> + break;
> + }
> + }
> +
> + temp = readl(regs + RCAR_USB3_DL_CTRL);
> + temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
> + writel(temp, regs + RCAR_USB3_DL_CTRL);
> +
> + for (time = 0; time < timeout; time++) {
> + val = readl(regs + RCAR_USB3_DL_CTRL);
> + if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
> + retval = 0;
> + break;
> + }
> + udelay(1);
> + }
> + if (time == timeout)
> + retval = -ETIMEDOUT;
> +
> + release_firmware(fw);
> +
> + return retval;
> +}
> +
> +/* This function needs to initialize a "phy" of usb before */
initializing a PHY looks like something that the PHY layer should do.
Why don't you write a PHY driver and teach xhci-core about PHYs ? Then,
more people would benefit.
cheers
--
balbi
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