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