drivers/usb/host/xhci-omap.c

   1 /*
   2  * OMAP USB HOST xHCI Controller
   3  *
   4  * (C) Copyright 2013
   5  * Texas Instruments, <www.ti.com>
   6  *
   7  * Author: Dan Murphy <dmurphy@ti.com>
   8  *
   9  * SPDX-License-Identifier:     GPL-2.0+
  10  */
  11
  12 #include <common.h>
  13 #include <usb.h>
  14 #include <asm-generic/errno.h>
  15 #include <asm/omap_common.h>
  16 #include <asm/arch/cpu.h>
  17 #include <asm/arch/sys_proto.h>
  18
  19 #include <linux/compat.h>
  20 #include <linux/usb/dwc3.h>
  21 #include <linux/usb/xhci-omap.h>
  22
  23 #include "xhci.h"
  24
  25 /* Declare global data pointer */
  26 DECLARE_GLOBAL_DATA_PTR;
  27
  28 static struct omap_xhci omap;
  29
  30 inline int __board_usb_init(int index, enum usb_init_type init)
  31 {
  32         return 0;
  33 }
  34 int board_usb_init(int index, enum usb_init_type init)
  35         __attribute__((weak, alias("__board_usb_init")));
  36
  37 static void dwc3_set_mode(struct dwc3 *dwc3_reg, u32 mode)
  38 {
  39         clrsetbits_le32(&dwc3_reg->g_ctl,
  40                         DWC3_GCTL_PRTCAPDIR(DWC3_GCTL_PRTCAP_OTG),
  41                         DWC3_GCTL_PRTCAPDIR(mode));
  42 }
  43
  44 static void dwc3_core_soft_reset(struct dwc3 *dwc3_reg)
  45 {
  46         /* Before Resetting PHY, put Core in Reset */
  47         setbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
  48
  49         omap_reset_usb_phy(dwc3_reg);
  50
  51         /* After PHYs are stable we can take Core out of reset state */
  52         clrbits_le32(&dwc3_reg->g_ctl, DWC3_GCTL_CORESOFTRESET);
  53 }
  54
  55 static int dwc3_core_init(struct dwc3 *dwc3_reg)
  56 {
  57         u32 reg;
  58         u32 revision;
  59         unsigned int dwc3_hwparams1;
  60
  61         revision = readl(&dwc3_reg->g_snpsid);
  62         /* This should read as U3 followed by revision number */
  63         if ((revision & DWC3_GSNPSID_MASK) != 0x55330000) {
  64                 puts("this is not a DesignWare USB3 DRD Core\n");
  65                 return -1;
  66         }
  67
  68         dwc3_core_soft_reset(dwc3_reg);
  69
  70         dwc3_hwparams1 = readl(&dwc3_reg->g_hwparams1);
  71
  72         reg = readl(&dwc3_reg->g_ctl);
  73         reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
  74         reg &= ~DWC3_GCTL_DISSCRAMBLE;
  75         switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc3_hwparams1)) {
  76         case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
  77                 reg &= ~DWC3_GCTL_DSBLCLKGTNG;
  78                 break;
  79         default:
  80                 debug("No power optimization available\n");
  81         }
  82
  83         /*
  84          * WORKAROUND: DWC3 revisions <1.90a have a bug
  85          * where the device can fail to connect at SuperSpeed
  86          * and falls back to high-speed mode which causes
  87          * the device to enter a Connect/Disconnect loop
  88          */
  89         if ((revision & DWC3_REVISION_MASK) < 0x190a)
  90                 reg |= DWC3_GCTL_U2RSTECN;
  91
  92         writel(reg, &dwc3_reg->g_ctl);
  93
  94         return 0;
  95 }
  96
  97 static int omap_xhci_core_init(struct omap_xhci *omap)
  98 {
  99         int ret = 0;
 100
 101         omap_enable_phy(omap);
 102
 103         ret = dwc3_core_init(omap->dwc3_reg);
 104         if (ret) {
 105                 debug("%s:failed to initialize core\n", __func__);
 106                 return ret;
 107         }
 108
 109         /* We are hard-coding DWC3 core to Host Mode */
 110         dwc3_set_mode(omap->dwc3_reg, DWC3_GCTL_PRTCAP_HOST);
 111
 112         return ret;
 113 }
 114
 115 static void omap_xhci_core_exit(struct omap_xhci *omap)
 116 {
 117         usb_phy_power(0);
 118 }
 119
 120 int xhci_hcd_init(int index, struct xhci_hccr **hccr, struct xhci_hcor **hcor)
 121 {
 122         struct omap_xhci *ctx = &omap;
 123         int ret = 0;
 124
 125         ctx->hcd = (struct xhci_hccr *)OMAP_XHCI_BASE;
 126         ctx->dwc3_reg = (struct dwc3 *)((char *)(ctx->hcd) + DWC3_REG_OFFSET);
 127         ctx->usb3_phy = (struct omap_usb3_phy *)OMAP_OCP1_SCP_BASE;
 128         ctx->otg_wrapper = (struct omap_dwc_wrapper *)OMAP_OTG_WRAPPER_BASE;
 129
 130         ret = board_usb_init(index, USB_INIT_HOST);
 131         if (ret != 0) {
 132                 puts("Failed to initialize board for USB\n");
 133                 return ret;
 134         }
 135
 136         ret = omap_xhci_core_init(ctx);
 137         if (ret < 0) {
 138                 puts("Failed to initialize xhci\n");
 139                 return ret;
 140         }
 141
 142         *hccr = (struct xhci_hccr *)(OMAP_XHCI_BASE);
 143         *hcor = (struct xhci_hcor *)((uint32_t) *hccr
 144                                 + HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
 145
 146         debug("omap-xhci: init hccr %x and hcor %x hc_length %d\n",
 147               (uint32_t)*hccr, (uint32_t)*hcor,
 148               (uint32_t)HC_LENGTH(xhci_readl(&(*hccr)->cr_capbase)));
 149
 150         return ret;
 151 }
 152
 153 void xhci_hcd_stop(int index)
 154 {
 155         struct omap_xhci *ctx = &omap;
 156
 157         omap_xhci_core_exit(ctx);
 158 }