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/* SPDX-License-Identifier: GPL-2.0-only */
#include <delay.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <acpi/acpi.h>
#include <device/mmio.h>
#include <device/pci_ops.h>
#include <soc/ramstage.h>
#include <soc/xhci.h>
#include <soc/cpu.h>
#ifdef __SIMPLE_DEVICE__
static u8 *usb_xhci_mem_base(pci_devfn_t dev)
{
u32 mem_base = pci_read_config32(dev, PCI_BASE_ADDRESS_0);
/* Check if the controller is disabled or not present */
if (mem_base == 0 || mem_base == 0xffffffff)
return 0;
return (u8 *)(mem_base & ~0xf);
}
static int usb_xhci_port_count_usb3(pci_devfn_t dev)
{
/* PCH-LP has 4 SS ports */
return 4;
}
static void usb_xhci_reset_status_usb3(u8 *mem_base, int port)
{
u8 *portsc = mem_base + XHCI_USB3_PORTSC(port);
u32 status = read32(portsc);
/* Do not set Port Enabled/Disabled field */
status &= ~XHCI_USB3_PORTSC_PED;
/* Clear all change status bits */
status |= XHCI_USB3_PORTSC_CHST;
write32(portsc, status);
}
static void usb_xhci_reset_port_usb3(u8 *mem_base, int port)
{
u8 *portsc = mem_base + XHCI_USB3_PORTSC(port);
write32(portsc, read32(portsc) | XHCI_USB3_PORTSC_WPR);
}
#define XHCI_RESET_DELAY_US 1000 /* 1ms */
#define XHCI_RESET_TIMEOUT 100 /* 100ms */
/*
* 1) Wait until port is done polling
* 2) If port is disconnected
* a) Issue warm port reset
* b) Poll for warm reset complete
* c) Write 1 to port change status bits
*/
static void usb_xhci_reset_usb3(pci_devfn_t dev, int all)
{
u32 status, port_disabled;
int timeout, port;
int port_count = usb_xhci_port_count_usb3(dev);
u8 *mem_base = usb_xhci_mem_base(dev);
if (!mem_base || !port_count)
return;
/* Get mask of disabled ports */
port_disabled = pci_read_config32(dev, XHCI_USB3PDO);
/* Wait until all enabled ports are done polling */
for (timeout = XHCI_RESET_TIMEOUT; timeout; timeout--) {
int complete = 1;
for (port = 0; port < port_count; port++) {
/* Skip disabled ports */
if (port_disabled & (1 << port))
continue;
/* Read port link status field */
status = read32(mem_base + XHCI_USB3_PORTSC(port));
status &= XHCI_USB3_PORTSC_PLS;
if (status == XHCI_PLSR_POLLING)
complete = 0;
}
/* Exit if all ports not polling */
if (complete)
break;
udelay(XHCI_RESET_DELAY_US);
}
/* Reset all requested ports */
for (port = 0; port < port_count; port++) {
u8 *portsc = mem_base + XHCI_USB3_PORTSC(port);
/* Skip disabled ports */
if (port_disabled & (1 << port))
continue;
status = read32(portsc) & XHCI_USB3_PORTSC_PLS;
/* Reset all or only disconnected ports */
if (all || (status == XHCI_PLSR_RXDETECT ||
status == XHCI_PLSR_POLLING))
usb_xhci_reset_port_usb3(mem_base, port);
else
port_disabled |= 1 << port;
}
/* Wait for warm reset complete on all reset ports */
for (timeout = XHCI_RESET_TIMEOUT; timeout; timeout--) {
int complete = 1;
for (port = 0; port < port_count; port++) {
/* Only check ports that were reset */
if (port_disabled & (1 << port))
continue;
/* Check if warm reset is complete */
status = read32(mem_base + XHCI_USB3_PORTSC(port));
if (!(status & XHCI_USB3_PORTSC_WRC))
complete = 0;
}
/* Check for warm reset complete in any port */
if (complete)
break;
udelay(XHCI_RESET_DELAY_US);
}
/* Clear port change status bits */
for (port = 0; port < port_count; port++)
usb_xhci_reset_status_usb3(mem_base, port);
}
/* Handler for XHCI controller on entry to S3/S4/S5 */
void usb_xhci_sleep_prepare(pci_devfn_t dev, u8 slp_typ)
{
u32 reg32;
u8 *mem_base = usb_xhci_mem_base(dev);
u8 is_broadwell = !!(cpu_family_model() == BROADWELL_FAMILY_ULT);
if (!mem_base || slp_typ < ACPI_S3)
return;
/* Set D0 state */
pci_update_config16(dev, XHCI_PWR_CTL_STS, ~XHCI_PWR_CTL_SET_MASK, XHCI_PWR_CTL_SET_D0);
if (!is_broadwell) {
/* This WA is only for lpt */
/* Clear PCI 0xB0[14:13] */
pci_and_config32(dev, 0xb0, ~((1 << 14) | (1 << 13)));
/* Clear MMIO 0x816c[14,2] */
reg32 = read32(mem_base + 0x816c);
reg32 &= ~((1 << 14) | (1 << 2));
write32(mem_base + 0x816c, reg32);
/* Reset disconnected USB3 ports */
usb_xhci_reset_usb3(dev, 0);
/* Set MMIO 0x80e0[15] */
reg32 = read32(mem_base + 0x80e0);
reg32 |= (1 << 15);
write32(mem_base + 0x80e0, reg32);
} else {
/*
* Clear port change status bits. Clearing CSC alone seemed to
* fix wakeup from S3 if entering USB compliance state even if
* bit wasn't set on the port.
*/
int port;
for (port = 0; port < usb_xhci_port_count_usb3(dev); port++)
usb_xhci_reset_status_usb3(mem_base, port);
}
reg32 = read32(mem_base + 0x8154);
reg32 &= ~(1 << 31);
write32(mem_base + 0x8154, reg32);
/* Set D3Hot state and enable PME */
pci_or_config16(dev, XHCI_PWR_CTL_STS, XHCI_PWR_CTL_SET_D3);
pci_or_config16(dev, XHCI_PWR_CTL_STS, XHCI_PWR_CTL_STATUS_PME);
pci_or_config16(dev, XHCI_PWR_CTL_STS, XHCI_PWR_CTL_ENABLE_PME);
}
#else /* !__SIMPLE_DEVICE__ */
static void xhci_init(struct device *dev)
{
struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0);
u16 reg16;
u32 reg32;
/* Ensure controller is in D0 state */
reg16 = pci_read_config16(dev, XHCI_PWR_CTL_STS);
reg16 &= ~XHCI_PWR_CTL_SET_MASK;
reg16 |= XHCI_PWR_CTL_SET_D0;
pci_write_config16(dev, XHCI_PWR_CTL_STS, reg16);
/* Disable Compliance Mode Entry */
reg32 = read32(res2mmio(res, 0x80ec, 0));
reg32 |= (1 << 0);
write32(res2mmio(res, 0x80ec, 0), reg32);
}
static struct device_operations usb_xhci_ops = {
.read_resources = pci_dev_read_resources,
.set_resources = pci_dev_set_resources,
.enable_resources = pci_dev_enable_resources,
.ops_pci = &pci_dev_ops_pci,
.init = xhci_init,
};
static const unsigned short pci_device_ids[] = {
0x9c31, /* LynxPoint-LP */
0x9cb1, /* WildcatPoint */
0
};
static const struct pci_driver pch_usb_xhci __pci_driver = {
.ops = &usb_xhci_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
#endif /* !__SIMPLE_DEVICE__ */
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