src/soc/intel/jasperlake/xhci.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <console/console.h>
   4 #include <device/mmio.h>
   5 #include <intelblocks/xhci.h>
   6 #include <soc/soc_chip.h>
   7 #include <static.h>
   8
   9 #define XHCI_USB2_PORT_STATUS_REG       0x480
  10 #define XHCI_USB3_PORT_STATUS_REG       0x500
  11 #define XHCI_USB2_PORT_NUM              8
  12 #define XHCI_USB3_PORT_NUM              6
  13
  14 #define XHCI_PMCTRL                     0x80A4
  15 /* BIT[7:4] LFPS periodic sampling off time for USB3 Ports */
  16 #define PMCTRL_LFPS_OFFTIME_SHIFT       4
  17 #define PMCTRL_LFPS_OFFTIME_MAX         0xF
  18
  19 static const struct xhci_usb_info usb_info = {
  20         .usb2_port_status_reg = XHCI_USB2_PORT_STATUS_REG,
  21         .num_usb2_ports = XHCI_USB2_PORT_NUM,
  22         .usb3_port_status_reg = XHCI_USB3_PORT_STATUS_REG,
  23         .num_usb3_ports = XHCI_USB3_PORT_NUM,
  24 };
  25
  26 const struct xhci_usb_info *soc_get_xhci_usb_info(pci_devfn_t xhci_dev)
  27 {
  28         /* Jasper Lake only has one XHCI controller */
  29         return &usb_info;
  30 }
  31
  32 static void set_xhci_lfps_sampling_offtime(struct device *dev, uint8_t time_ms)
  33 {
  34         void *addr;
  35         const struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0);
  36
  37         if (!res)
  38                 return;
  39
  40         if (time_ms > PMCTRL_LFPS_OFFTIME_MAX) {
  41                 printk(BIOS_ERR,
  42                         "XHCI: The maximum LFPS sampling OFF time is %u ms, "
  43                         "cannot set it to %u ms\n",
  44                         PMCTRL_LFPS_OFFTIME_MAX, time_ms);
  45
  46                 return;
  47         }
  48
  49         addr = (void *)(uintptr_t)(res->base + XHCI_PMCTRL);
  50         clrsetbits32(addr,
  51                 PMCTRL_LFPS_OFFTIME_MAX << PMCTRL_LFPS_OFFTIME_SHIFT,
  52                 time_ms << PMCTRL_LFPS_OFFTIME_SHIFT);
  53         printk(BIOS_DEBUG,
  54                 "XHCI: Updated LFPS sampling OFF time to %u ms\n", time_ms);
  55 }
  56
  57 void soc_xhci_init(struct device *dev)
  58 {
  59         const config_t *config = config_of_soc();
  60
  61         /* Set xHCI LFPS period sampling off time */
  62         set_xhci_lfps_sampling_offtime(dev,
  63                 config->xhci_lfps_sampling_offtime_ms);
  64 }