drivers/usb/host/xhci-rcar.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * xHCI host controller driver for R-Car SoCs
   4  *
   5  * Copyright (C) 2014 Renesas Electronics Corporation
   6  */
   7
   8 #include <linux/firmware.h>
   9 #include <linux/module.h>
  10 #include <linux/platform_device.h>
  11 #include <linux/of.h>
  12 #include <linux/usb/phy.h>
  13 #include <linux/sys_soc.h>
  14
  15 #include "xhci.h"
  16 #include "xhci-plat.h"
  17 #include "xhci-rcar.h"
  18
  19 /*
  20 * - The V3 firmware is for r8a7796 (with good performance) and r8a7795 es2.0
  21 *   or later.
  22 * - The V2 firmware can be used on both r8a7795 (es1.x) and r8a7796.
  23 * - The V2 firmware is possible to use on R-Car Gen2. However, the V2 causes
  24 *   performance degradation. So, this driver continues to use the V1 if R-Car
  25 *   Gen2.
  26 * - The V1 firmware is impossible to use on R-Car Gen3.
  27 */
  28 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V1);
  29 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V2);
  30 MODULE_FIRMWARE(XHCI_RCAR_FIRMWARE_NAME_V3);
  31
  32 /*** Register Offset ***/
  33 #define RCAR_USB3_INT_ENA       0x224   /* Interrupt Enable */
  34 #define RCAR_USB3_DL_CTRL       0x250   /* FW Download Control & Status */
  35 #define RCAR_USB3_FW_DATA0      0x258   /* FW Data0 */
  36
  37 #define RCAR_USB3_LCLK          0xa44   /* LCLK Select */
  38 #define RCAR_USB3_CONF1         0xa48   /* USB3.0 Configuration1 */
  39 #define RCAR_USB3_CONF2         0xa5c   /* USB3.0 Configuration2 */
  40 #define RCAR_USB3_CONF3         0xaa8   /* USB3.0 Configuration3 */
  41 #define RCAR_USB3_RX_POL        0xab0   /* USB3.0 RX Polarity */
  42 #define RCAR_USB3_TX_POL        0xab8   /* USB3.0 TX Polarity */
  43
  44 /*** Register Settings ***/
  45 /* Interrupt Enable */
  46 #define RCAR_USB3_INT_XHC_ENA   0x00000001
  47 #define RCAR_USB3_INT_PME_ENA   0x00000002
  48 #define RCAR_USB3_INT_HSE_ENA   0x00000004
  49 #define RCAR_USB3_INT_ENA_VAL   (RCAR_USB3_INT_XHC_ENA | \
  50                                 RCAR_USB3_INT_PME_ENA | RCAR_USB3_INT_HSE_ENA)
  51
  52 /* FW Download Control & Status */
  53 #define RCAR_USB3_DL_CTRL_ENABLE        0x00000001
  54 #define RCAR_USB3_DL_CTRL_FW_SUCCESS    0x00000010
  55 #define RCAR_USB3_DL_CTRL_FW_SET_DATA0  0x00000100
  56
  57 /* LCLK Select */
  58 #define RCAR_USB3_LCLK_ENA_VAL  0x01030001
  59
  60 /* USB3.0 Configuration */
  61 #define RCAR_USB3_CONF1_VAL     0x00030204
  62 #define RCAR_USB3_CONF2_VAL     0x00030300
  63 #define RCAR_USB3_CONF3_VAL     0x13802007
  64
  65 /* USB3.0 Polarity */
  66 #define RCAR_USB3_RX_POL_VAL    BIT(21)
  67 #define RCAR_USB3_TX_POL_VAL    BIT(4)
  68
  69 /* For soc_device_attribute */
  70 #define RCAR_XHCI_FIRMWARE_V2   BIT(0) /* FIRMWARE V2 */
  71 #define RCAR_XHCI_FIRMWARE_V3   BIT(1) /* FIRMWARE V3 */
  72
  73 static const struct soc_device_attribute rcar_quirks_match[]  = {
  74         {
  75                 .soc_id = "r8a7795", .revision = "ES1.*",
  76                 .data = (void *)RCAR_XHCI_FIRMWARE_V2,
  77         },
  78         {
  79                 .soc_id = "r8a7795",
  80                 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
  81         },
  82         {
  83                 .soc_id = "r8a7796",
  84                 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
  85         },
  86         {
  87                 .soc_id = "r8a77965",
  88                 .data = (void *)RCAR_XHCI_FIRMWARE_V3,
  89         },
  90         { /* sentinel */ },
  91 };
  92
  93 static void xhci_rcar_start_gen2(struct usb_hcd *hcd)
  94 {
  95         /* LCLK Select */
  96         writel(RCAR_USB3_LCLK_ENA_VAL, hcd->regs + RCAR_USB3_LCLK);
  97         /* USB3.0 Configuration */
  98         writel(RCAR_USB3_CONF1_VAL, hcd->regs + RCAR_USB3_CONF1);
  99         writel(RCAR_USB3_CONF2_VAL, hcd->regs + RCAR_USB3_CONF2);
 100         writel(RCAR_USB3_CONF3_VAL, hcd->regs + RCAR_USB3_CONF3);
 101         /* USB3.0 Polarity */
 102         writel(RCAR_USB3_RX_POL_VAL, hcd->regs + RCAR_USB3_RX_POL);
 103         writel(RCAR_USB3_TX_POL_VAL, hcd->regs + RCAR_USB3_TX_POL);
 104 }
 105
 106 static int xhci_rcar_is_gen2(struct device *dev)
 107 {
 108         struct device_node *node = dev->of_node;
 109
 110         return of_device_is_compatible(node, "renesas,xhci-r8a7790") ||
 111                 of_device_is_compatible(node, "renesas,xhci-r8a7791") ||
 112                 of_device_is_compatible(node, "renesas,xhci-r8a7793") ||
 113                 of_device_is_compatible(node, "renensas,rcar-gen2-xhci");
 114 }
 115
 116 static int xhci_rcar_is_gen3(struct device *dev)
 117 {
 118         struct device_node *node = dev->of_node;
 119
 120         return of_device_is_compatible(node, "renesas,xhci-r8a7795") ||
 121                 of_device_is_compatible(node, "renesas,xhci-r8a7796") ||
 122                 of_device_is_compatible(node, "renesas,rcar-gen3-xhci");
 123 }
 124
 125 void xhci_rcar_start(struct usb_hcd *hcd)
 126 {
 127         u32 temp;
 128
 129         if (hcd->regs != NULL) {
 130                 /* Interrupt Enable */
 131                 temp = readl(hcd->regs + RCAR_USB3_INT_ENA);
 132                 temp |= RCAR_USB3_INT_ENA_VAL;
 133                 writel(temp, hcd->regs + RCAR_USB3_INT_ENA);
 134                 if (xhci_rcar_is_gen2(hcd->self.controller))
 135                         xhci_rcar_start_gen2(hcd);
 136         }
 137 }
 138
 139 static int xhci_rcar_download_firmware(struct usb_hcd *hcd)
 140 {
 141         struct device *dev = hcd->self.controller;
 142         void __iomem *regs = hcd->regs;
 143         struct xhci_plat_priv *priv = hcd_to_xhci_priv(hcd);
 144         const struct firmware *fw;
 145         int retval, index, j, time;
 146         int timeout = 10000;
 147         u32 data, val, temp;
 148         u32 quirks = 0;
 149         const struct soc_device_attribute *attr;
 150         const char *firmware_name;
 151
 152         attr = soc_device_match(rcar_quirks_match);
 153         if (attr)
 154                 quirks = (uintptr_t)attr->data;
 155
 156         if (quirks & RCAR_XHCI_FIRMWARE_V2)
 157                 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V2;
 158         else if (quirks & RCAR_XHCI_FIRMWARE_V3)
 159                 firmware_name = XHCI_RCAR_FIRMWARE_NAME_V3;
 160         else
 161                 firmware_name = priv->firmware_name;
 162
 163         /* request R-Car USB3.0 firmware */
 164         retval = request_firmware(&fw, firmware_name, dev);
 165         if (retval)
 166                 return retval;
 167
 168         /* download R-Car USB3.0 firmware */
 169         temp = readl(regs + RCAR_USB3_DL_CTRL);
 170         temp |= RCAR_USB3_DL_CTRL_ENABLE;
 171         writel(temp, regs + RCAR_USB3_DL_CTRL);
 172
 173         for (index = 0; index < fw->size; index += 4) {
 174                 /* to avoid reading beyond the end of the buffer */
 175                 for (data = 0, j = 3; j >= 0; j--) {
 176                         if ((j + index) < fw->size)
 177                                 data |= fw->data[index + j] << (8 * j);
 178                 }
 179                 writel(data, regs + RCAR_USB3_FW_DATA0);
 180                 temp = readl(regs + RCAR_USB3_DL_CTRL);
 181                 temp |= RCAR_USB3_DL_CTRL_FW_SET_DATA0;
 182                 writel(temp, regs + RCAR_USB3_DL_CTRL);
 183
 184                 for (time = 0; time < timeout; time++) {
 185                         val = readl(regs + RCAR_USB3_DL_CTRL);
 186                         if ((val & RCAR_USB3_DL_CTRL_FW_SET_DATA0) == 0)
 187                                 break;
 188                         udelay(1);
 189                 }
 190                 if (time == timeout) {
 191                         retval = -ETIMEDOUT;
 192                         break;
 193                 }
 194         }
 195
 196         temp = readl(regs + RCAR_USB3_DL_CTRL);
 197         temp &= ~RCAR_USB3_DL_CTRL_ENABLE;
 198         writel(temp, regs + RCAR_USB3_DL_CTRL);
 199
 200         for (time = 0; time < timeout; time++) {
 201                 val = readl(regs + RCAR_USB3_DL_CTRL);
 202                 if (val & RCAR_USB3_DL_CTRL_FW_SUCCESS) {
 203                         retval = 0;
 204                         break;
 205                 }
 206                 udelay(1);
 207         }
 208         if (time == timeout)
 209                 retval = -ETIMEDOUT;
 210
 211         release_firmware(fw);
 212
 213         return retval;
 214 }
 215
 216 /* This function needs to initialize a "phy" of usb before */
 217 int xhci_rcar_init_quirk(struct usb_hcd *hcd)
 218 {
 219         struct xhci_hcd *xhci = hcd_to_xhci(hcd);
 220
 221         /* If hcd->regs is NULL, we don't just call the following function */
 222         if (!hcd->regs)
 223                 return 0;
 224
 225         /*
 226          * On R-Car Gen2 and Gen3, the AC64 bit (bit 0) of HCCPARAMS1 is set
 227          * to 1. However, these SoCs don't support 64-bit address memory
 228          * pointers. So, this driver clears the AC64 bit of xhci->hcc_params
 229          * to call dma_set_coherent_mask(dev, DMA_BIT_MASK(32)) in
 230          * xhci_gen_setup().
 231          */
 232         if (xhci_rcar_is_gen2(hcd->self.controller) ||
 233                         xhci_rcar_is_gen3(hcd->self.controller))
 234                 xhci->quirks |= XHCI_NO_64BIT_SUPPORT;
 235
 236         return xhci_rcar_download_firmware(hcd);
 237 }
 238
 239 int xhci_rcar_resume_quirk(struct usb_hcd *hcd)
 240 {
 241         int ret;
 242
 243         ret = xhci_rcar_download_firmware(hcd);
 244         if (!ret)
 245                 xhci_rcar_start(hcd);
 246
 247         return ret;
 248 }