drivers/usb/host/xhci-exynos5.c

   1 /*
   2  * SAMSUNG EXYNOS5 USB HOST XHCI Controller
   3  *
   4  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   5  *      Vivek Gautam <gautam.vivek@samsung.com>
   6  *      Vikas Sajjan <vikas.sajjan@samsung.com>
   7  *
   8  * SPDX-License-Identifier:     GPL-2.0+
   9  */
  10
  11 /*
  12  * This file is a conglomeration for DWC3-init sequence and further
  13  * exynos5 specific PHY-init sequence.
  14  */
  15
  16 #include <common.h>
  17 #include <fdtdec.h>
  18 #include <libfdt.h>
  19 #include <malloc.h>
  20 #include <usb.h>
  21 #include <watchdog.h>
  22 #include <asm/arch/cpu.h>
  23 #include <asm/arch/power.h>
  24 #include <asm/arch/xhci-exynos.h>
  25 #include <asm/gpio.h>
  26 #include <asm-generic/errno.h>
  27 #include <linux/compat.h>
  28 #include <linux/usb/dwc3.h>
  29
  30 #include "xhci.h"
  31
  32 /* Declare global data pointer */
  33 DECLARE_GLOBAL_DATA_PTR;
  34
  35 /**
  36  * Contains pointers to register base addresses
  37  * for the usb controller.
  38  */
  39 struct exynos_xhci {
  40         struct exynos_usb3_phy *usb3_phy;
  41         struct xhci_hccr *hcd;
  42         struct dwc3 *dwc3_reg;
  43         struct gpio_desc vbus_gpio;
  44 };
  45
  46 static struct exynos_xhci exynos;
  47
  48 #ifdef CONFIG_OF_CONTROL
  49 static int exynos_usb3_parse_dt(const void *blob, struct exynos_xhci *exynos)
  50 {
  51         fdt_addr_t addr;
  52         unsigned int node;
  53         int depth;
  54
  55         node = fdtdec_next_compatible(blob, 0, COMPAT_SAMSUNG_EXYNOS5_XHCI);
  56         if (node <= 0) {
  57                 debug("XHCI: Can't get device node for xhci\n");
  58                 return -ENODEV;
  59         }
  60
  61         /*
  62          * Get the base address for XHCI controller from the device node
  63          */
  64         addr = fdtdec_get_addr(blob, node, "reg");
  65         if (addr == FDT_ADDR_T_NONE) {
  66                 debug("Can't get the XHCI register base address\n");
  67                 return -ENXIO;
  68         }
  69         exynos->hcd = (struct xhci_hccr *)addr;
  70
  71         /* Vbus gpio */
  72         gpio_request_by_name_nodev(blob, node, "samsung,vbus-gpio", 0,
  73                                    &exynos->vbus_gpio, GPIOD_IS_OUT);
  74
  75         depth = 0;
  76         node = fdtdec_next_compatible_subnode(blob, node,
  77                                 COMPAT_SAMSUNG_EXYNOS5_USB3_PHY, &depth);
  78         if (node <= 0) {
  79                 debug("XHCI: Can't get device node for usb3-phy controller\n");
  80                 return -ENODEV;
  81         }
  82
  83         /*
  84          * Get the base address for usbphy from the device node
  85          */
  86         exynos->usb3_phy = (struct exynos_usb3_phy *)fdtdec_get_addr(blob, node,
  87                                                                 "reg");
  88         if (exynos->usb3_phy == NULL) {
  89                 debug("Can't get the usbphy register address\n");
  90                 return -ENXIO;
  91         }
  92
  93         return 0;
  94 }
  95 #endif
  96
  97 static void exynos5_usb3_phy_init(struct exynos_usb3_phy *phy)
  98 {
  99         u32 reg;
 100
 101         /* enabling usb_drd phy */
 102         set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_EN);
 103
 104         /* Reset USB 3.0 PHY */
 105         writel(0x0, &phy->phy_reg0);
 106
 107         clrbits_le32(&phy->phy_param0,
 108                         /* Select PHY CLK source */
 109                         PHYPARAM0_REF_USE_PAD |
 110                         /* Set Loss-of-Signal Detector sensitivity */
 111                         PHYPARAM0_REF_LOSLEVEL_MASK);
 112         setbits_le32(&phy->phy_param0, PHYPARAM0_REF_LOSLEVEL);
 113
 114         writel(0x0, &phy->phy_resume);
 115
 116         /*
 117          * Setting the Frame length Adj value[6:1] to default 0x20
 118          * See xHCI 1.0 spec, 5.2.4
 119          */
 120         setbits_le32(&phy->link_system,
 121                         LINKSYSTEM_XHCI_VERSION_CONTROL |
 122                         LINKSYSTEM_FLADJ(0x20));
 123
 124         /* Set Tx De-Emphasis level */
 125         clrbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH_MASK);
 126         setbits_le32(&phy->phy_param1, PHYPARAM1_PCS_TXDEEMPH);
 127
 128         setbits_le32(&phy->phy_batchg, PHYBATCHG_UTMI_CLKSEL);
 129
 130         /* PHYTEST POWERDOWN Control */
 131         clrbits_le32(&phy->phy_test,
 132                         PHYTEST_POWERDOWN_SSP |
 133                         PHYTEST_POWERDOWN_HSP);
 134
 135         /* UTMI Power Control */
 136         writel(PHYUTMI_OTGDISABLE, &phy->phy_utmi);
 137
 138                 /* Use core clock from main PLL */
 139         reg = PHYCLKRST_REFCLKSEL_EXT_REFCLK |
 140                 /* Default 24Mhz crystal clock */
 141                 PHYCLKRST_FSEL(FSEL_CLKSEL_24M) |
 142                 PHYCLKRST_MPLL_MULTIPLIER_24MHZ_REF |
 143                 PHYCLKRST_SSC_REFCLKSEL(0x88) |
 144                 /* Force PortReset of PHY */
 145                 PHYCLKRST_PORTRESET |
 146                 /* Digital power supply in normal operating mode */
 147                 PHYCLKRST_RETENABLEN |
 148                 /* Enable ref clock for SS function */
 149                 PHYCLKRST_REF_SSP_EN |
 150                 /* Enable spread spectrum */
 151                 PHYCLKRST_SSC_EN |
 152                 /* Power down HS Bias and PLL blocks in suspend mode */
 153                 PHYCLKRST_COMMONONN;
 154
 155         writel(reg, &phy->phy_clk_rst);
 156
 157         /* giving time to Phy clock to settle before resetting */
 158         udelay(10);
 159
 160         reg &= ~PHYCLKRST_PORTRESET;
 161         writel(reg, &phy->phy_clk_rst);
 162 }
 163
 164 static void exynos5_usb3_phy_exit(struct exynos_usb3_phy *phy)
 165 {
 166         setbits_le32(&phy->phy_utmi,
 167                         PHYUTMI_OTGDISABLE |
 168                         PHYUTMI_FORCESUSPEND |
 169                         PHYUTMI_FORCESLEEP);
 170
 171         clrbits_le32(&phy->phy_clk_rst,
 172                         PHYCLKRST_REF_SSP_EN |
 173                         PHYCLKRST_SSC_EN |
 174                         PHYCLKRST_COMMONONN);
 175
 176         /* PHYTEST POWERDOWN Control to remove leakage current */
 177         setbits_le32(&phy->phy_test,
 178                         PHYTEST_POWERDOWN_SSP |
 179                         PHYTEST_POWERDOWN_HSP);
 180
 181         /* disabling usb_drd phy */
 182         set_usbdrd_phy_ctrl(POWER_USB_DRD_PHY_CTRL_DISABLE);
 183 }
 184
 185 void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
 186 {
 187         clrsetbits_le32(&dwc3_reg->g_ctl,
 188                         DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
 189                         DWC3_GCTL_PRTCAPDIR(mode));
 190 }
 191
 192 static void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
 193 {
 194         /* Before Resetting PHY, put Core in Reset */
 195         setbits_le32(&dwc3_reg->g_ctl,
 196                         DWC3_GCTL_CORESOFTRESET);
 197
 198         /* Assert USB3 PHY reset */
 199         setbits_le32(&dwc3_reg->g_usb3pipectl[0],
 200                         DWC3_GUSB3PIPECTL_PHYSOFTRST);
 201
 202         /* Assert USB2 PHY reset */
 203         setbits_le32(&dwc3_reg->g_usb2phycfg,
 204                         DWC3_GUSB2PHYCFG_PHYSOFTRST);
 205
 206         mdelay(100);
 207
 208         /* Clear USB3 PHY reset */
 209         clrbits_le32(&dwc3_reg->g_usb3pipectl[0],
 210                         DWC3_GUSB3PIPECTL_PHYSOFTRST);
 211
 212         /* Clear USB2 PHY reset */
 213         clrbits_le32(&dwc3_reg->g_usb2phycfg,
 214                         DWC3_GUSB2PHYCFG_PHYSOFTRST);
 215
 216         /* After PHYs are stable we can take Core out of reset state */
 217         clrbits_le32(&dwc3_reg->g_ctl,
 218                         DWC3_GCTL_CORESOFTRESET);
 219 }
 220
 221 static int dwc3_core_init(struct dwc3 *dwc3_reg)
 222 {
 223         u32 reg;
 224         u32 revision;
 225         unsigned int dwc3_hwparams1;
 226
 227         revision = readl(&dwc3_reg->g_snpsid);
 228         /* This should read as U3 followed by revision number */
 229         if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
 230                 puts("this is not a DesignWare USB3 DRD Core\n");
 231                 return -EINVAL;
 232         }
 233
 234         dwc3_core_soft_reset(dwc3_reg);
 235
 236         dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
 237
 238         reg = readl(&dwc3_reg->g_ctl);
 239         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
 240         reg &= ~DWC3_GCTL_DISSCRAMBLE;
 241         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
 242         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
 243                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
 244                 break;
 245         default:
 246                 debug("No power optimization available\n");
 247         }
 248
 249         /*
 250          * WORKAROUND: DWC3 revisions <1.90a have a bug
 251          * where the device can fail to connect at SuperSpeed
 252          * and falls back to high-speed mode which causes
 253          * the device to enter a Connect/Disconnect loop
 254          */
 255         if ((revision & DWC3_REVISION_MASK) < 0x190a)
 256                 reg |= DWC3_GCTL_U2RSTECN;
 257
 258         writel(reg, &dwc3_reg->g_ctl);
 259
 260         return 0;
 261 }
 262
 263 static int exynos_xhci_core_init(struct exynos_xhci *exynos)
 264 {
 265         int ret;
 266
 267         exynos5_usb3_phy_init(exynos->usb3_phy);
 268
 269         ret = dwc3_core_init(exynos->dwc3_reg);
 270         if (ret) {
 271                 debug("failed to initialize core\n");
 272                 return -EINVAL;
 273         }
 274
 275         /* We are hard-coding DWC3 core to Host Mode */
 276         dwc3_set_mode(exynos->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
 277
 278         return 0;
 279 }
 280
 281 static void exynos_xhci_core_exit(struct exynos_xhci *exynos)
 282 {
 283         exynos5_usb3_phy_exit(exynos->usb3_phy);
 284 }
 285
 286 int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
 287 {
 288         struct exynos_xhci *ctx = &exynos;
 289         int ret;
 290
 291 #ifdef CONFIG_OF_CONTROL
 292         exynos_usb3_parse_dt(gd->fdt_blob, ctx);
 293 #else
 294         ctx->usb3_phy = (struct exynos_usb3_phy *)samsung_get_base_usb3_phy();
 295         ctx->hcd = (struct xhci_hccr *)samsung_get_base_usb_xhci();
 296 #endif
 297
 298         ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
 299
 300 #ifdef CONFIG_OF_CONTROL
 301         /* setup the Vbus gpio here */
 302         if (dm_gpio_is_valid(&ctx->vbus_gpio))
 303                 dm_gpio_set_value(&ctx->vbus_gpio, 1);
 304 #endif
 305
 306         ret = exynos_xhci_core_init(ctx);
 307         if (ret) {
 308                 puts("XHCI: failed to initialize controller\n");
 309                 return -EINVAL;
 310         }
 311
 312         *hccr = (ctx->hcd);
 313         *hcor = (struct xhci_hcor *)((uint32_t) *hccr
 314                                 + HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
 315
 316         debug("Exynos5-xhci: init hccr %x and hcor %x hc_length %d\n",
 317                 (uint32_t)*hccr, (uint32_t)*hcor,
 318                 (uint32_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
 319
 320         return 0;
 321 }
 322
 323 void xhci_hcd_stop(int index)
 324 {
 325         struct exynos_xhci *ctx = &exynos;
 326
 327         exynos_xhci_core_exit(ctx);
 328 }