drivers/usb/host/ehci-exynos.c

   1 /*
   2  * SAMSUNG EXYNOS USB HOST EHCI Controller
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   5  *      Vivek Gautam <gautam.vivek@samsung.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #include <common.h>
  11 #include <dm.h>
  12 #include <fdtdec.h>
  13 #include <libfdt.h>
  14 #include <malloc.h>
  15 #include <usb.h>
  16 #include <asm/arch/cpu.h>
  17 #include <asm/arch/ehci.h>
  18 #include <asm/arch/system.h>
  19 #include <asm/arch/power.h>
  20 #include <asm/gpio.h>
  21 #include <asm-generic/errno.h>
  22 #include <linux/compat.h>
  23 #include "ehci.h"
  24
  25 /* Declare global data pointer */
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 struct exynos_ehci_platdata {
  29         struct usb_platdata usb_plat;
  30         fdt_addr_t hcd_base;
  31         fdt_addr_t phy_base;
  32         struct gpio_desc vbus_gpio;
  33 };
  34
  35 /**
  36  * Contains pointers to register base addresses
  37  * for the usb controller.
  38  */
  39 struct exynos_ehci {
  40         struct ehci_ctrl ctrl;
  41         struct exynos_usb_phy *usb;
  42         struct ehci_hccr *hcd;
  43 };
  44
  45 static int ehci_usb_ofdata_to_platdata(struct udevice *dev)
  46 {
  47         struct exynos_ehci_platdata *plat = dev_get_platdata(dev);
  48         const void *blob = gd->fdt_blob;
  49         unsigned int node;
  50         int depth;
  51
  52         /*
  53          * Get the base address for XHCI controller from the device node
  54          */
  55         plat->hcd_base = dev_get_addr(dev);
  56         if (plat->hcd_base == FDT_ADDR_T_NONE) {
  57                 debug("Can't get the XHCI register base address\n");
  58                 return -ENXIO;
  59         }
  60
  61         depth = 0;
  62         node = fdtdec_next_compatible_subnode(blob, dev->of_offset,
  63                                 COMPAT_SAMSUNG_EXYNOS_USB_PHY, &depth);
  64         if (node <= 0) {
  65                 debug("XHCI: Can't get device node for usb3-phy controller\n");
  66                 return -ENODEV;
  67         }
  68
  69         /*
  70          * Get the base address for usbphy from the device node
  71          */
  72         plat->phy_base = fdtdec_get_addr(blob, node, "reg");
  73         if (plat->phy_base == FDT_ADDR_T_NONE) {
  74                 debug("Can't get the usbphy register address\n");
  75                 return -ENXIO;
  76         }
  77
  78         /* Vbus gpio */
  79         gpio_request_by_name(dev, "samsung,vbus-gpio", 0,
  80                              &plat->vbus_gpio, GPIOD_IS_OUT);
  81
  82         return 0;
  83 }
  84
  85 static void exynos5_setup_usb_phy(struct exynos_usb_phy *usb)
  86 {
  87         u32 hsic_ctrl;
  88
  89         clrbits_le32(&usb->usbphyctrl0,
  90                         HOST_CTRL0_FSEL_MASK |
  91                         HOST_CTRL0_COMMONON_N |
  92                         /* HOST Phy setting */
  93                         HOST_CTRL0_PHYSWRST |
  94                         HOST_CTRL0_PHYSWRSTALL |
  95                         HOST_CTRL0_SIDDQ |
  96                         HOST_CTRL0_FORCESUSPEND |
  97                         HOST_CTRL0_FORCESLEEP);
  98
  99         setbits_le32(&usb->usbphyctrl0,
 100                         /* Setting up the ref freq */
 101                         (CLK_24MHZ << 16) |
 102                         /* HOST Phy setting */
 103                         HOST_CTRL0_LINKSWRST |
 104                         HOST_CTRL0_UTMISWRST);
 105         udelay(10);
 106         clrbits_le32(&usb->usbphyctrl0,
 107                         HOST_CTRL0_LINKSWRST |
 108                         HOST_CTRL0_UTMISWRST);
 109
 110         /* HSIC Phy Setting */
 111         hsic_ctrl = (HSIC_CTRL_FORCESUSPEND |
 112                         HSIC_CTRL_FORCESLEEP |
 113                         HSIC_CTRL_SIDDQ);
 114
 115         clrbits_le32(&usb->hsicphyctrl1, hsic_ctrl);
 116         clrbits_le32(&usb->hsicphyctrl2, hsic_ctrl);
 117
 118         hsic_ctrl = (((HSIC_CTRL_REFCLKDIV_12 & HSIC_CTRL_REFCLKDIV_MASK)
 119                                 << HSIC_CTRL_REFCLKDIV_SHIFT)
 120                         | ((HSIC_CTRL_REFCLKSEL & HSIC_CTRL_REFCLKSEL_MASK)
 121                                 << HSIC_CTRL_REFCLKSEL_SHIFT)
 122                         | HSIC_CTRL_UTMISWRST);
 123
 124         setbits_le32(&usb->hsicphyctrl1, hsic_ctrl);
 125         setbits_le32(&usb->hsicphyctrl2, hsic_ctrl);
 126
 127         udelay(10);
 128
 129         clrbits_le32(&usb->hsicphyctrl1, HSIC_CTRL_PHYSWRST |
 130                                         HSIC_CTRL_UTMISWRST);
 131
 132         clrbits_le32(&usb->hsicphyctrl2, HSIC_CTRL_PHYSWRST |
 133                                         HSIC_CTRL_UTMISWRST);
 134
 135         udelay(20);
 136
 137         /* EHCI Ctrl setting */
 138         setbits_le32(&usb->ehcictrl,
 139                         EHCICTRL_ENAINCRXALIGN |
 140                         EHCICTRL_ENAINCR4 |
 141                         EHCICTRL_ENAINCR8 |
 142                         EHCICTRL_ENAINCR16);
 143 }
 144
 145 static void exynos4412_setup_usb_phy(struct exynos4412_usb_phy *usb)
 146 {
 147         writel(CLK_24MHZ, &usb->usbphyclk);
 148
 149         clrbits_le32(&usb->usbphyctrl, (PHYPWR_NORMAL_MASK_HSIC0 |
 150                 PHYPWR_NORMAL_MASK_HSIC1 | PHYPWR_NORMAL_MASK_PHY1 |
 151                 PHYPWR_NORMAL_MASK_PHY0));
 152
 153         setbits_le32(&usb->usbphyrstcon, (RSTCON_HOSTPHY_SWRST | RSTCON_SWRST));
 154         udelay(10);
 155         clrbits_le32(&usb->usbphyrstcon, (RSTCON_HOSTPHY_SWRST | RSTCON_SWRST));
 156 }
 157
 158 static void setup_usb_phy(struct exynos_usb_phy *usb)
 159 {
 160         set_usbhost_mode(USB20_PHY_CFG_HOST_LINK_EN);
 161
 162         set_usbhost_phy_ctrl(POWER_USB_HOST_PHY_CTRL_EN);
 163
 164         if (cpu_is_exynos5())
 165                 exynos5_setup_usb_phy(usb);
 166         else if (cpu_is_exynos4())
 167                 if (proid_is_exynos4412())
 168                         exynos4412_setup_usb_phy((struct exynos4412_usb_phy *)
 169                                                  usb);
 170 }
 171
 172 static void exynos5_reset_usb_phy(struct exynos_usb_phy *usb)
 173 {
 174         u32 hsic_ctrl;
 175
 176         /* HOST_PHY reset */
 177         setbits_le32(&usb->usbphyctrl0,
 178                         HOST_CTRL0_PHYSWRST |
 179                         HOST_CTRL0_PHYSWRSTALL |
 180                         HOST_CTRL0_SIDDQ |
 181                         HOST_CTRL0_FORCESUSPEND |
 182                         HOST_CTRL0_FORCESLEEP);
 183
 184         /* HSIC Phy reset */
 185         hsic_ctrl = (HSIC_CTRL_FORCESUSPEND |
 186                         HSIC_CTRL_FORCESLEEP |
 187                         HSIC_CTRL_SIDDQ |
 188                         HSIC_CTRL_PHYSWRST);
 189
 190         setbits_le32(&usb->hsicphyctrl1, hsic_ctrl);
 191         setbits_le32(&usb->hsicphyctrl2, hsic_ctrl);
 192 }
 193
 194 static void exynos4412_reset_usb_phy(struct exynos4412_usb_phy *usb)
 195 {
 196         setbits_le32(&usb->usbphyctrl, (PHYPWR_NORMAL_MASK_HSIC0 |
 197                 PHYPWR_NORMAL_MASK_HSIC1 | PHYPWR_NORMAL_MASK_PHY1 |
 198                 PHYPWR_NORMAL_MASK_PHY0));
 199 }
 200
 201 /* Reset the EHCI host controller. */
 202 static void reset_usb_phy(struct exynos_usb_phy *usb)
 203 {
 204         if (cpu_is_exynos5())
 205                 exynos5_reset_usb_phy(usb);
 206         else if (cpu_is_exynos4())
 207                 if (proid_is_exynos4412())
 208                         exynos4412_reset_usb_phy((struct exynos4412_usb_phy *)
 209                                                  usb);
 210
 211         set_usbhost_phy_ctrl(POWER_USB_HOST_PHY_CTRL_DISABLE);
 212 }
 213
 214 static int ehci_usb_probe(struct udevice *dev)
 215 {
 216         struct exynos_ehci_platdata *plat = dev_get_platdata(dev);
 217         struct exynos_ehci *ctx = dev_get_priv(dev);
 218         struct ehci_hcor *hcor;
 219
 220         ctx->hcd = (struct ehci_hccr *)plat->hcd_base;
 221         ctx->usb = (struct exynos_usb_phy *)plat->phy_base;
 222
 223         /* setup the Vbus gpio here */
 224         if (dm_gpio_is_valid(&plat->vbus_gpio))
 225                 dm_gpio_set_value(&plat->vbus_gpio, 1);
 226
 227         setup_usb_phy(ctx->usb);
 228         hcor = (struct ehci_hcor *)((uint32_t)ctx->hcd +
 229                         HC_LENGTH(ehci_readl(&ctx->hcd->cr_capbase)));
 230
 231         return ehci_register(dev, ctx->hcd, hcor, NULL, 0, USB_INIT_HOST);
 232 }
 233
 234 static int ehci_usb_remove(struct udevice *dev)
 235 {
 236         struct exynos_ehci *ctx = dev_get_priv(dev);
 237         int ret;
 238
 239         ret = ehci_deregister(dev);
 240         if (ret)
 241                 return ret;
 242         reset_usb_phy(ctx->usb);
 243
 244         return 0;
 245 }
 246
 247 static const struct udevice_id ehci_usb_ids[] = {
 248         { .compatible = "samsung,exynos-ehci" },
 249         { }
 250 };
 251
 252 U_BOOT_DRIVER(usb_ehci) = {
 253         .name   = "ehci_exynos",
 254         .id     = UCLASS_USB,
 255         .of_match = ehci_usb_ids,
 256         .ofdata_to_platdata = ehci_usb_ofdata_to_platdata,
 257         .probe = ehci_usb_probe,
 258         .remove = ehci_usb_remove,
 259         .ops    = &ehci_usb_ops,
 260         .priv_auto_alloc_size = sizeof(struct exynos_ehci),
 261         .platdata_auto_alloc_size = sizeof(struct exynos_ehci_platdata),
 262         .flags  = DM_FLAG_ALLOC_PRIV_DMA,
 263 };