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/of.h>
  15 #include <linux/usb/phy.h>
  16
  17 #include "xhci.h"
  18 #include "xhci-plat.h"
  19 #include "xhci-rcar.h"
  20
  21 /*
  22 * - The V3 firmware is for r8a7796 (with good performance).
  23 * - The V2 firmware can be used on both r8a7795 (es1.x) and r8a7796.
  24 * - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
  25 *   performance degradation. So, this driver continues to use the V1 if R-Car
  26 *   Gen2.
  27 * - The V1 firmware is impossible to use on R-Car Gen3.
  28 */
  29 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
  30 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
  31 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V3);
  32
  33 /*** Register Offset ***/
  34 #define RCAR_USB3_INT_ENA       0x224   /* Interrupt Enable */
  35 #define RCAR_USB3_DL_CTRL       0x250   /* FW Download Control & Status */
  36 #define RCAR_USB3_FW_DATA0      0x258   /* FW Data0 */
  37
  38 #define RCAR_USB3_LCLK          0xa44   /* LCLK Select */
  39 #define RCAR_USB3_CONF1         0xa48   /* USB3.0 Configuration1 */
  40 #define RCAR_USB3_CONF2         0xa5c   /* USB3.0 Configuration2 */
  41 #define RCAR_USB3_CONF3         0xaa8   /* USB3.0 Configuration3 */
  42 #define RCAR_USB3_RX_POL        0xab0   /* USB3.0 RX Polarity */
  43 #define RCAR_USB3_TX_POL        0xab8   /* USB3.0 TX Polarity */
  44
  45 /*** Register Settings ***/
  46 /* Interrupt Enable */
  47 #define RCAR_USB3_INT_XHC_ENA   0x00000001
  48 #define RCAR_USB3_INT_PME_ENA   0x00000002
  49 #define RCAR_USB3_INT_HSE_ENA   0x00000004
  50 #define RCAR_USB3_INT_ENA_VAL   (RCAR_USB3_INT_XHC_ENA | \
  51                                 RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
  52
  53 /* FW Download Control & Status */
  54 #define RCAR_USB3_DL_CTRL_ENABLE        0x00000001
  55 #define RCAR_USB3_DL_CTRL_FW_SUCCESS    0x00000010
  56 #define RCAR_USB3_DL_CTRL_FW_SET_DATA0  0x00000100
  57
  58 /* LCLK Select */
  59 #define RCAR_USB3_LCLK_ENA_VAL  0x01030001
  60
  61 /* USB3.0 Configuration */
  62 #define RCAR_USB3_CONF1_VAL     0x00030204
  63 #define RCAR_USB3_CONF2_VAL     0x00030300
  64 #define RCAR_USB3_CONF3_VAL     0x13802007
  65
  66 /* USB3.0 Polarity */
  67 #define RCAR_USB3_RX_POL_VAL    BIT(21)
  68 #define RCAR_USB3_TX_POL_VAL    BIT(4)
  69
  70 static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
  71 {
  72         /* LCLK Select */
  73         writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
  74         /* USB3.0 Configuration */
  75         writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
  76         writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
  77         writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
  78         /* USB3.0 Polarity */
  79         writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
  80         writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
  81 }
  82
  83 static int xhci_rcar_is_gen2(struct device *dev)
  84 {
  85         struct device_node *node = dev->of_node;
  86
  87         return of_device_is_compatible(node, "renesas,xhci-r8a7790") ||
  88                 of_device_is_compatible(node, "renesas,xhci-r8a7791") ||
  89                 of_device_is_compatible(node, "renesas,xhci-r8a7793") ||
  90                 of_device_is_compatible(node, "renensas,rcar-gen2-xhci");
  91 }
  92
  93 static int xhci_rcar_is_gen3(struct device *dev)
  94 {
  95         struct device_node *node = dev->of_node;
  96
  97         return of_device_is_compatible(node, "renesas,xhci-r8a7795") ||
  98                 of_device_is_compatible(node, "renesas,xhci-r8a7796") ||
  99                 of_device_is_compatible(node, "renesas,rcar-gen3-xhci");
 100 }
 101
 102 void xhci_rcar_start(struct usb_hcd *hcd)
 103 {
 104         u32 temp;
 105
 106         if (hcd->regs != NULL) {
 107                 /* Interrupt Enable */
 108                 temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
 109                 temp |= RCAR_USB3_INT_ENA_VAL;
 110                 writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
 111                 if (xhci_rcar_is_gen2(hcd->self.controller))
 112                         xhci_rcar_start_gen2(hcd);
 113         }
 114 }
 115
 116 static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 117 {
 118         struct device *dev = hcd->self.controller;
 119         void __iomem *regs = hcd->regs;
 120         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 121         const struct firmware *fw;
 122         int retval, index, j, time;
 123         int timeout = 10000;
 124         u32 data, val, temp;
 125
 126         /* request R-Car USB3.0 firmware */
 127         retval = request_firmware(&fw, priv->firmware_name, dev);
 128         if (retval)
 129                 return retval;
 130
 131         /* download R-Car USB3.0 firmware */
 132         temp = readl(regs + RCAR_USB3_DL_CTRL);
 133         temp |= RCAR_USB3_DL_CTRL_ENABLE;
 134         writel(temp, regs + RCAR_USB3_DL_CTRL);
 135
 136         for (index = 0; index < fw->size; index += 4) {
 137                 /* to avoid reading beyond the end of the buffer */
 138                 for (data = 0, j = 3; j >= 0; j--) {
 139                         if ((j + index) < fw->size)
 140                                 data |= fw->data[index + j] << (8 * j);
 141                 }
 142                 writel(data, regs + RCAR_USB3_FW_DATA0);
 143                 temp = readl(regs + RCAR_USB3_DL_CTRL);
 144                 temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
 145                 writel(temp, regs + RCAR_USB3_DL_CTRL);
 146
 147                 for (time = 0; time < timeout; time++) {
 148                         val = readl(regs + RCAR_USB3_DL_CTRL);
 149                         if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
 150                                 break;
 151                         udelay(1);
 152                 }
 153                 if (time == timeout) {
 154                         retval = -ETIMEDOUT;
 155                         break;
 156                 }
 157         }
 158
 159         temp = readl(regs + RCAR_USB3_DL_CTRL);
 160         temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
 161         writel(temp, regs + RCAR_USB3_DL_CTRL);
 162
 163         for (time = 0; time < timeout; time++) {
 164                 val = readl(regs + RCAR_USB3_DL_CTRL);
 165                 if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
 166                         retval = 0;
 167                         break;
 168                 }
 169                 udelay(1);
 170         }
 171         if (time == timeout)
 172                 retval = -ETIMEDOUT;
 173
 174         release_firmware(fw);
 175
 176         return retval;
 177 }
 178
 179 /* This function needs to initialize a "phy" of usb before */
 180 int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 181 {
 182         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 183
 184         /* If hcd->regs is NULL, we don't just call the following function */
 185         if (!hcd->regs)
 186                 return 0;
 187
 188         /*
 189          * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
 190          * to 1. However, these SoCs don't support 64-bit address memory
 191          * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
 192          * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
 193          * xhci_gen_setup().
 194          */
 195         if (xhci_rcar_is_gen2(hcd->self.controller) ||
 196                         xhci_rcar_is_gen3(hcd->self.controller))
 197                 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
 198
 199         return xhci_rcar_download_firmware(hcd);
 200 }
 201
 202 int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
 203 {
 204         int ret;
 205
 206         ret = xhci_rcar_download_firmware(hcd);
 207         if (!ret)
 208                 xhci_rcar_start(hcd);
 209
 210         return ret;
 211 }