165 lines
4.6 KiB
C
165 lines
4.6 KiB
C
/*
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* xHCI host controller driver for R-Car SoCs
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*
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* Copyright (C) 2014 Renesas Electronics Corporation
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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*/
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#include <linux/firmware.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/usb/phy.h>
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#include "xhci.h"
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#include "xhci-plat.h"
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#include "xhci-rcar.h"
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/*
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* - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
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* performance degradation. So, this driver continues to use the V1 if R-Car
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* Gen2.
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* - The V1 firmware is impossible to use on R-Car Gen3.
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*/
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MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
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MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
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/*** Register Offset ***/
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#define RCAR_USB3_INT_ENA 0x224 /* Interrupt Enable */
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#define RCAR_USB3_DL_CTRL 0x250 /* FW Download Control & Status */
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#define RCAR_USB3_FW_DATA0 0x258 /* FW Data0 */
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#define RCAR_USB3_LCLK 0xa44 /* LCLK Select */
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#define RCAR_USB3_CONF1 0xa48 /* USB3.0 Configuration1 */
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#define RCAR_USB3_CONF2 0xa5c /* USB3.0 Configuration2 */
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#define RCAR_USB3_CONF3 0xaa8 /* USB3.0 Configuration3 */
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#define RCAR_USB3_RX_POL 0xab0 /* USB3.0 RX Polarity */
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#define RCAR_USB3_TX_POL 0xab8 /* USB3.0 TX Polarity */
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/*** Register Settings ***/
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/* Interrupt Enable */
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#define RCAR_USB3_INT_XHC_ENA 0x00000001
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#define RCAR_USB3_INT_PME_ENA 0x00000002
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#define RCAR_USB3_INT_HSE_ENA 0x00000004
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#define RCAR_USB3_INT_ENA_VAL (RCAR_USB3_INT_XHC_ENA | \
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RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
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/* FW Download Control & Status */
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#define RCAR_USB3_DL_CTRL_ENABLE 0x00000001
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#define RCAR_USB3_DL_CTRL_FW_SUCCESS 0x00000010
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#define RCAR_USB3_DL_CTRL_FW_SET_DATA0 0x00000100
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/* LCLK Select */
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#define RCAR_USB3_LCLK_ENA_VAL 0x01030001
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/* USB3.0 Configuration */
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#define RCAR_USB3_CONF1_VAL 0x00030204
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#define RCAR_USB3_CONF2_VAL 0x00030300
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#define RCAR_USB3_CONF3_VAL 0x13802007
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/* USB3.0 Polarity */
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#define RCAR_USB3_RX_POL_VAL BIT(21)
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#define RCAR_USB3_TX_POL_VAL BIT(4)
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static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
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{
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/* LCLK Select */
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writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
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/* USB3.0 Configuration */
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writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
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writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
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writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
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/* USB3.0 Polarity */
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writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
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writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
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}
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void xhci_rcar_start(struct usb_hcd *hcd)
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{
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u32 temp;
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if (hcd->regs != NULL) {
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/* Interrupt Enable */
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temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
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temp |= RCAR_USB3_INT_ENA_VAL;
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writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
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if (xhci_plat_type_is(hcd, XHCI_PLAT_TYPE_RENESAS_RCAR_GEN2))
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xhci_rcar_start_gen2(hcd);
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}
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}
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static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
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{
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struct device *dev = hcd->self.controller;
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void __iomem *regs = hcd->regs;
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struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
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const struct firmware *fw;
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int retval, index, j, time;
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int timeout = 10000;
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u32 data, val, temp;
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/* request R-Car USB3.0 firmware */
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retval = request_firmware(&fw, priv->firmware_name, dev);
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if (retval)
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return retval;
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/* download R-Car USB3.0 firmware */
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temp = readl(regs + RCAR_USB3_DL_CTRL);
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temp |= RCAR_USB3_DL_CTRL_ENABLE;
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writel(temp, regs + RCAR_USB3_DL_CTRL);
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for (index = 0; index < fw->size; index += 4) {
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/* to avoid reading beyond the end of the buffer */
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for (data = 0, j = 3; j >= 0; j--) {
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if ((j + index) < fw->size)
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data |= fw->data[index + j] << (8 * j);
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}
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writel(data, regs + RCAR_USB3_FW_DATA0);
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temp = readl(regs + RCAR_USB3_DL_CTRL);
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temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
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writel(temp, regs + RCAR_USB3_DL_CTRL);
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for (time = 0; time < timeout; time++) {
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val = readl(regs + RCAR_USB3_DL_CTRL);
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if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
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break;
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udelay(1);
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}
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if (time == timeout) {
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retval = -ETIMEDOUT;
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break;
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}
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}
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temp = readl(regs + RCAR_USB3_DL_CTRL);
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temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
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writel(temp, regs + RCAR_USB3_DL_CTRL);
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for (time = 0; time < timeout; time++) {
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val = readl(regs + RCAR_USB3_DL_CTRL);
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if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
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retval = 0;
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break;
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}
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udelay(1);
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}
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if (time == timeout)
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retval = -ETIMEDOUT;
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release_firmware(fw);
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return retval;
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}
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/* This function needs to initialize a "phy" of usb before */
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int xhci_rcar_init_quirk(struct usb_hcd *hcd)
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{
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/* If hcd->regs is NULL, we don't just call the following function */
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if (!hcd->regs)
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return 0;
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return xhci_rcar_download_firmware(hcd);
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}
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