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