drivers/usb/host/xhci-dwc3.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2015 Freescale Semiconductor, Inc.
   4  *
   5  * DWC3 controller driver
   6  *
   7  * Author: Ramneek Mehresh<ramneek.mehresh@freescale.com>
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <generic-phy.h>
  14 #include <usb.h>
  15
  16 #include "xhci.h"
  17 #include <asm/io.h>
  18 #include <linux/usb/dwc3.h>
  19 #include <linux/usb/otg.h>
  20
  21 struct xhci_dwc3_platdata {
  22         struct phy *usb_phys;
  23         int num_phys;
  24 };
  25
  26 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
  27 {
  28         clrsetbits_le32(&dwc3_reg->g_ctl,
  29                         DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
  30                         DWC3_GCTL_PRTCAPDIR(mode));
  31 }
  32
  33 static void dwc3_phy_reset(struct dwc3 *dwc3_reg)
  34 {
  35         /* Assert USB3 PHY reset */
  36         setbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
  37
  38         /* Assert USB2 PHY reset */
  39         setbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
  40
  41         mdelay(100);
  42
  43         /* Clear USB3 PHY reset */
  44         clrbits_le32(&dwc3_reg->g_usb3pipectl[0], DWC3_GUSB3PIPECTL_PHYSOFTRST);
  45
  46         /* Clear USB2 PHY reset */
  47         clrbits_le32(&dwc3_reg->g_usb2phycfg, DWC3_GUSB2PHYCFG_PHYSOFTRST);
  48 }
  49
  50 void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
  51 {
  52         /* Before Resetting PHY, put Core in Reset */
  53         setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
  54
  55         /* reset USB3 phy - if required */
  56         dwc3_phy_reset(dwc3_reg);
  57
  58         mdelay(100);
  59
  60         /* After PHYs are stable we can take Core out of reset state */
  61         clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
  62 }
  63
  64 int dwc3_core_init(struct dwc3 *dwc3_reg)
  65 {
  66         u32 reg;
  67         u32 revision;
  68         unsigned int dwc3_hwparams1;
  69
  70         revision = readl(&dwc3_reg->g_snpsid);
  71         /* This should read as U3 followed by revision number */
  72         if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
  73                 puts("this is not a DesignWare USB3 DRD Core\n");
  74                 return -1;
  75         }
  76
  77         dwc3_core_soft_reset(dwc3_reg);
  78
  79         dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
  80
  81         reg = readl(&dwc3_reg->g_ctl);
  82         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
  83         reg &= ~DWC3_GCTL_DISSCRAMBLE;
  84         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
  85         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
  86                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
  87                 break;
  88         default:
  89                 debug("No power optimization available\n");
  90         }
  91
  92         /*
  93          * WORKAROUND: DWC3 revisions <1.90a have a bug
  94          * where the device can fail to connect at SuperSpeed
  95          * and falls back to high-speed mode which causes
  96          * the device to enter a Connect/Disconnect loop
  97          */
  98         if ((revision & DWC3_REVISION_MASK) < 0x190a)
  99                 reg |= DWC3_GCTL_U2RSTECN;
 100
 101         writel(reg, &dwc3_reg->g_ctl);
 102
 103         return 0;
 104 }
 105
 106 void dwc3_set_fladj(struct dwc3 *dwc3_reg, u32 val)
 107 {
 108         setbits_le32(&dwc3_reg->g_fladj, GFLADJ_30MHZ_REG_SEL |
 109                         GFLADJ_30MHZ(val));
 110 }
 111
 112 #ifdef CONFIG_DM_USB
 113 static int xhci_dwc3_setup_phy(struct udevice *dev)
 114 {
 115         struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
 116         int i, ret, count;
 117
 118         /* Return if no phy declared */
 119         if (!dev_read_prop(dev, "phys", NULL))
 120                 return 0;
 121
 122         count = dev_count_phandle_with_args(dev, "phys", "#phy-cells");
 123         if (count <= 0)
 124                 return count;
 125
 126         plat->usb_phys = devm_kcalloc(dev, count, sizeof(struct phy),
 127                                       GFP_KERNEL);
 128         if (!plat->usb_phys)
 129                 return -ENOMEM;
 130
 131         for (i = 0; i < count; i++) {
 132                 ret = generic_phy_get_by_index(dev, i, &plat->usb_phys[i]);
 133                 if (ret && ret != -ENOENT) {
 134                         pr_err("Failed to get USB PHY%d for %s\n",
 135                                i, dev->name);
 136                         return ret;
 137                 }
 138
 139                 ++plat->num_phys;
 140         }
 141
 142         for (i = 0; i < plat->num_phys; i++) {
 143                 ret = generic_phy_init(&plat->usb_phys[i]);
 144                 if (ret) {
 145                         pr_err("Can't init USB PHY%d for %s\n",
 146                                i, dev->name);
 147                         goto phys_init_err;
 148                 }
 149         }
 150
 151         for (i = 0; i < plat->num_phys; i++) {
 152                 ret = generic_phy_power_on(&plat->usb_phys[i]);
 153                 if (ret) {
 154                         pr_err("Can't power USB PHY%d for %s\n",
 155                                i, dev->name);
 156                         goto phys_poweron_err;
 157                 }
 158         }
 159
 160         return 0;
 161
 162 phys_poweron_err:
 163         for (; i >= 0; i--)
 164                 generic_phy_power_off(&plat->usb_phys[i]);
 165
 166         for (i = 0; i < plat->num_phys; i++)
 167                 generic_phy_exit(&plat->usb_phys[i]);
 168
 169         return ret;
 170
 171 phys_init_err:
 172         for (; i >= 0; i--)
 173                 generic_phy_exit(&plat->usb_phys[i]);
 174
 175         return ret;
 176 }
 177
 178 static int xhci_dwc3_shutdown_phy(struct udevice *dev)
 179 {
 180         struct xhci_dwc3_platdata *plat = dev_get_platdata(dev);
 181         int i, ret;
 182
 183         for (i = 0; i < plat->num_phys; i++) {
 184                 if (!generic_phy_valid(&plat->usb_phys[i]))
 185                         continue;
 186
 187                 ret = generic_phy_power_off(&plat->usb_phys[i]);
 188                 ret |= generic_phy_exit(&plat->usb_phys[i]);
 189                 if (ret) {
 190                         pr_err("Can't shutdown USB PHY%d for %s\n",
 191                                i, dev->name);
 192                 }
 193         }
 194
 195         return 0;
 196 }
 197
 198 static int xhci_dwc3_probe(struct udevice *dev)
 199 {
 200         struct xhci_hcor *hcor;
 201         struct xhci_hccr *hccr;
 202         struct dwc3 *dwc3_reg;
 203         enum usb_dr_mode dr_mode;
 204         int ret;
 205
 206         hccr = (struct xhci_hccr *)((uintptr_t)dev_read_addr(dev));
 207         hcor = (struct xhci_hcor *)((uintptr_t)hccr +
 208                         HC_LENGTH(xhci_readl(&(hccr)->cr_capbase)));
 209
 210         ret = xhci_dwc3_setup_phy(dev);
 211         if (ret)
 212                 return ret;
 213
 214         dwc3_reg = (struct dwc3 *)((char *)(hccr) + DWC3_REG_OFFSET);
 215
 216         dwc3_core_init(dwc3_reg);
 217
 218         dr_mode = usb_get_dr_mode(dev_of_offset(dev));
 219         if (dr_mode == USB_DR_MODE_UNKNOWN)
 220                 /* by default set dual role mode to HOST */
 221                 dr_mode = USB_DR_MODE_HOST;
 222
 223         dwc3_set_mode(dwc3_reg, dr_mode);
 224
 225         return xhci_register(dev, hccr, hcor);
 226 }
 227
 228 static int xhci_dwc3_remove(struct udevice *dev)
 229 {
 230         xhci_dwc3_shutdown_phy(dev);
 231
 232         return xhci_deregister(dev);
 233 }
 234
 235 static const struct udevice_id xhci_dwc3_ids[] = {
 236         { .compatible = "snps,dwc3" },
 237         { }
 238 };
 239
 240 U_BOOT_DRIVER(xhci_dwc3) = {
 241         .name = "xhci-dwc3",
 242         .id = UCLASS_USB,
 243         .of_match = xhci_dwc3_ids,
 244         .probe = xhci_dwc3_probe,
 245         .remove = xhci_dwc3_remove,
 246         .ops = &xhci_usb_ops,
 247         .priv_auto_alloc_size = sizeof(struct xhci_ctrl),
 248         .platdata_auto_alloc_size = sizeof(struct xhci_dwc3_platdata),
 249         .flags = DM_FLAG_ALLOC_PRIV_DMA,
 250 };
 251 #endif