xhci.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/mmio.h>
#include <intelblocks/xhci.h>
#include <soc/soc_chip.h>
 
#define XHCI_USB2_PORT_STATUS_REG       0x480
#define XHCI_USB3_PORT_STATUS_REG       0x500
#define XHCI_USB2_PORT_NUM              8
#define XHCI_USB3_PORT_NUM              6
 
#define XHCI_PMCTRL                     0x80A4
/* BIT[7:4] LFPS periodic sampling off time for USB3 Ports */
#define PMCTRL_LFPS_OFFTIME_SHIFT       4
#define PMCTRL_LFPS_OFFTIME_MAX         0xF
 
static const struct xhci_usb_info usb_info = {
        .usb2_port_status_reg = XHCI_USB2_PORT_STATUS_REG,
        .num_usb2_ports = XHCI_USB2_PORT_NUM,
        .usb3_port_status_reg = XHCI_USB3_PORT_STATUS_REG,
        .num_usb3_ports = XHCI_USB3_PORT_NUM,
};
 
const struct xhci_usb_info *soc_get_xhci_usb_info(pci_devfn_t xhci_dev)
{
        /* Jasper Lake only has one XHCI controller */
        return &usb_info;
}
 
static void set_xhci_lfps_sampling_offtime(struct device *dev, uint8_t time_ms)
{
        void *addr;
        const struct resource *res = probe_resource(dev, PCI_BASE_ADDRESS_0);
 
        if (!res)
                return;
 
        if (time_ms > PMCTRL_LFPS_OFFTIME_MAX) {
                printk(BIOS_ERR,
                        "XHCI: The maximum LFPS sampling OFF time is %u ms, "
                        "cannot set it to %u ms\n",
                        PMCTRL_LFPS_OFFTIME_MAX, time_ms);
 
                return;
        }
 
        addr = (void *)(uintptr_t)(res->base + XHCI_PMCTRL);
        clrsetbits32(addr,
                PMCTRL_LFPS_OFFTIME_MAX << PMCTRL_LFPS_OFFTIME_SHIFT,
                time_ms << PMCTRL_LFPS_OFFTIME_SHIFT);
        printk(BIOS_DEBUG,
                "XHCI: Updated LFPS sampling OFF time to %u ms\n", time_ms);
}
 
void soc_xhci_init(struct device *dev)
{
        const config_t *config = config_of_soc();
 
        /* Set xHCI LFPS period sampling off time */
        set_xhci_lfps_sampling_offtime(dev,
                config->xhci_lfps_sampling_offtime_ms);
}