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