drivers/usb/host/xhci-rcar.c

   1 /*
   2  * xHCI host controller driver for R-Car SoCs
   3  *
   4  * Copyright (C) 2014 Renesas Electronics Corporation
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * version 2 as published by the Free Software Foundation.
   9  */
  10
  11 #include <linux/firmware.h>
  12 #include <linux/module.h>
  13 #include <linux/platform_device.h>
  14 #include <linux/usb/phy.h>
  15
  16 #include "xhci.h"
  17 #include "xhci-rcar.h"
  18
  19 #define FIRMWARE_NAME           "r8a779x_usb3_v1.dlmem"
  20 MODULE_FIRMWARE(FIRMWARE_NAME);
  21
  22 /*** Register Offset ***/
  23 #define RCAR_USB3_INT_ENA       0x224   /* Interrupt Enable */
  24 #define RCAR_USB3_DL_CTRL       0x250   /* FW Download Control & Status */
  25 #define RCAR_USB3_FW_DATA0      0x258   /* FW Data0 */
  26
  27 #define RCAR_USB3_LCLK          0xa44   /* LCLK Select */
  28 #define RCAR_USB3_CONF1         0xa48   /* USB3.0 Configuration1 */
  29 #define RCAR_USB3_CONF2         0xa5c   /* USB3.0 Configuration2 */
  30 #define RCAR_USB3_CONF3         0xaa8   /* USB3.0 Configuration3 */
  31 #define RCAR_USB3_RX_POL        0xab0   /* USB3.0 RX Polarity */
  32 #define RCAR_USB3_TX_POL        0xab8   /* USB3.0 TX Polarity */
  33
  34 /*** Register Settings ***/
  35 /* Interrupt Enable */
  36 #define RCAR_USB3_INT_XHC_ENA   0x00000001
  37 #define RCAR_USB3_INT_PME_ENA   0x00000002
  38 #define RCAR_USB3_INT_HSE_ENA   0x00000004
  39 #define RCAR_USB3_INT_ENA_VAL   (RCAR_USB3_INT_XHC_ENA | \
  40                                 RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
  41
  42 /* FW Download Control & Status */
  43 #define RCAR_USB3_DL_CTRL_ENABLE        0x00000001
  44 #define RCAR_USB3_DL_CTRL_FW_SUCCESS    0x00000010
  45 #define RCAR_USB3_DL_CTRL_FW_SET_DATA0  0x00000100
  46
  47 /* LCLK Select */
  48 #define RCAR_USB3_LCLK_ENA_VAL  0x01030001
  49
  50 /* USB3.0 Configuration */
  51 #define RCAR_USB3_CONF1_VAL     0x00030204
  52 #define RCAR_USB3_CONF2_VAL     0x00030300
  53 #define RCAR_USB3_CONF3_VAL     0x13802007
  54
  55 /* USB3.0 Polarity */
  56 #define RCAR_USB3_RX_POL_VAL    BIT(21)
  57 #define RCAR_USB3_TX_POL_VAL    BIT(4)
  58
  59 void xhci_rcar_start(struct usb_hcd *hcd)
  60 {
  61         u32 temp;
  62
  63         if (hcd->regs != NULL) {
  64                 /* Interrupt Enable */
  65                 temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
  66                 temp |= RCAR_USB3_INT_ENA_VAL;
  67                 writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
  68                 /* LCLK Select */
  69                 writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
  70                 /* USB3.0 Configuration */
  71                 writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
  72                 writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
  73                 writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
  74                 /* USB3.0 Polarity */
  75                 writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
  76                 writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
  77         }
  78 }
  79
  80 static int xhci_rcar_download_firmware(struct device *dev, void __iomem *regs)
  81 {
  82         const struct firmware *fw;
  83         int retval, index, j, time;
  84         int timeout = 10000;
  85         u32 data, val, temp;
  86
  87         /* request R-Car USB3.0 firmware */
  88         retval = request_firmware(&fw, FIRMWARE_NAME, dev);
  89         if (retval)
  90                 return retval;
  91
  92         /* download R-Car USB3.0 firmware */
  93         temp = readl(regs + RCAR_USB3_DL_CTRL);
  94         temp |= RCAR_USB3_DL_CTRL_ENABLE;
  95         writel(temp, regs + RCAR_USB3_DL_CTRL);
  96
  97         for (index = 0; index < fw->size; index += 4) {
  98                 /* to avoid reading beyond the end of the buffer */
  99                 for (data = 0, j = 3; j >= 0; j--) {
 100                         if ((j + index) < fw->size)
 101                                 data |= fw->data[index + j] << (8 * j);
 102                 }
 103                 writel(data, regs + RCAR_USB3_FW_DATA0);
 104                 temp = readl(regs + RCAR_USB3_DL_CTRL);
 105                 temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
 106                 writel(temp, regs + RCAR_USB3_DL_CTRL);
 107
 108                 for (time = 0; time < timeout; time++) {
 109                         val = readl(regs + RCAR_USB3_DL_CTRL);
 110                         if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
 111                                 break;
 112                         udelay(1);
 113                 }
 114                 if (time == timeout) {
 115                         retval = -ETIMEDOUT;
 116                         break;
 117                 }
 118         }
 119
 120         temp = readl(regs + RCAR_USB3_DL_CTRL);
 121         temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
 122         writel(temp, regs + RCAR_USB3_DL_CTRL);
 123
 124         for (time = 0; time < timeout; time++) {
 125                 val = readl(regs + RCAR_USB3_DL_CTRL);
 126                 if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
 127                         retval = 0;
 128                         break;
 129                 }
 130                 udelay(1);
 131         }
 132         if (time == timeout)
 133                 retval = -ETIMEDOUT;
 134
 135         release_firmware(fw);
 136
 137         return retval;
 138 }
 139
 140 /* This function needs to initialize a "phy" of usb before */
 141 int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 142 {
 143         /* If hcd->regs is NULL, we don't just call the following function */
 144         if (!hcd->regs)
 145                 return 0;
 146
 147         return xhci_rcar_download_firmware(hcd->self.controller, hcd->regs);
 148 }