src/soc/intel/apollolake/xdci.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <device/mmio.h>
   4 #include <console/console.h>
   5 #include <device/device.h>
   6 #include <device/pci.h>
   7 #include <intelblocks/xdci.h>
   8 #include <soc/pci_devs.h>
   9 #include <timer.h>
  10
  11 #define DUAL_ROLE_CFG0          0x80d8
  12 # define DRD_CONFIG_MASK        (0x3 << 0)
  13 # define DRD_CONFIG_DYNAMIC     (0x0 << 0)
  14 # define DRD_CONFIG_HOST        (0x1 << 0)
  15 # define DRD_CONFIG_DEVICE      (0x2 << 0)
  16 # define SW_VBUS_VALID_MASK     (1 << 24)
  17 # define SW_VBUS_DEASSERT_VALID (0 << 24)
  18 # define SW_VBUS_ASSERT_VALID   (1 << 24)
  19 # define SW_IDPIN_EN_MASK       (1 << 21)
  20 # define SW_IDPIN_DIS           (0 << 21)
  21 # define SW_IDPIN_EN            (1 << 21)
  22 # define SW_IDPIN_MASK          (1 << 20)
  23 # define SW_IDPIN_HOST          (0 << 20)
  24 # define SW_IDPIN_DEVICE        (1 << 20)
  25 #define DUAL_ROLE_CFG1          0x80dc
  26 # define DRD_MODE_MASK          (1 << 29)
  27 # define DRD_MODE_DEVICE        (0 << 29)
  28 # define DRD_MODE_HOST          (1 << 29)
  29
  30 static void configure_host_mode_port0(struct device *dev)
  31 {
  32         uint32_t *cfg0;
  33         uint32_t *cfg1;
  34         const struct resource *res;
  35         uint32_t reg;
  36         struct stopwatch sw;
  37
  38         /*
  39          * Only default to host mode if the xdci device is present and
  40          * enabled. If it's disabled assume the switch was already done
  41          * in FSP.
  42          */
  43         if (!dev->enabled)
  44                 return;
  45
  46         printk(BIOS_INFO, "Putting port 0 into host mode.\n");
  47
  48         res = find_resource(dev, PCI_BASE_ADDRESS_0);
  49
  50         cfg0 = (void *)(uintptr_t)(res->base + DUAL_ROLE_CFG0);
  51         cfg1 = (void *)(uintptr_t)(res->base + DUAL_ROLE_CFG1);
  52
  53         reg = read32(cfg0);
  54         reg &= ~(DRD_CONFIG_MASK | SW_IDPIN_EN_MASK | SW_IDPIN_MASK);
  55         reg &= ~(SW_VBUS_VALID_MASK);
  56         reg |= DRD_CONFIG_DYNAMIC | SW_IDPIN_EN | SW_IDPIN_HOST;
  57         reg |= SW_VBUS_DEASSERT_VALID;
  58         write32(cfg0, reg);
  59
  60         stopwatch_init_msecs_expire(&sw, 10);
  61
  62         /* Wait for the host mode status bit. */
  63         while ((read32(cfg1) & DRD_MODE_MASK) != DRD_MODE_HOST) {
  64                 if (stopwatch_expired(&sw)) {
  65                         printk(BIOS_INFO, "Timed out waiting for host mode.\n");
  66                         break;
  67                 }
  68         }
  69
  70         printk(BIOS_INFO, "XDCI port 0 host switch over took %lld ms\n",
  71                 stopwatch_duration_msecs(&sw));
  72 }
  73
  74 void soc_xdci_init(struct device *dev)
  75 {
  76         configure_host_mode_port0(dev);
  77 }