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/* SPDX-License-Identifier: GPL-2.0-only */
#include <device/mmio.h>
#include <device/pci_ops.h>
#include <acpi/acpi_gnvs.h>
#include <console/console.h>
#include <device/device.h>
#include <device/pci.h>
#include <device/pci_ids.h>
#include <soc/iobp.h>
#include <soc/nvs.h>
#include <soc/pci_devs.h>
#include <soc/pch.h>
#include <soc/ramstage.h>
#include <soc/rcba.h>
#include <soc/serialio.h>
#include <soc/intel/broadwell/chip.h>
/* Set D3Hot Power State in ACPI mode */
static void serialio_enable_d3hot(struct resource *res)
{
u32 reg32 = read32(res2mmio(res, PCH_PCS, 0));
reg32 |= PCH_PCS_PS_D3HOT;
write32(res2mmio(res, PCH_PCS, 0), reg32);
}
static int serialio_uart_is_debug(struct device *dev)
{
#if CONFIG(INTEL_PCH_UART_CONSOLE)
switch (dev->path.pci.devfn) {
case PCH_DEVFN_UART0: /* UART0 */
return !!(CONFIG_INTEL_PCH_UART_CONSOLE_NUMBER == 0);
case PCH_DEVFN_UART1: /* UART1 */
return !!(CONFIG_INTEL_PCH_UART_CONSOLE_NUMBER == 1);
}
#endif
return 0;
}
/* Enable clock in PCI mode */
static void serialio_enable_clock(struct resource *bar0)
{
u32 reg32 = read32(res2mmio(bar0, SIO_REG_PPR_CLOCK, 0));
reg32 |= SIO_REG_PPR_CLOCK_EN;
write32(res2mmio(bar0, SIO_REG_PPR_CLOCK, 0), reg32);
}
/* Put Serial IO D21:F0-F6 device into desired mode. */
static void serialio_d21_mode(int sio_index, int int_pin, int acpi_mode)
{
u32 portctrl = SIO_IOBP_PORTCTRL_PM_CAP_PRSNT;
/* Snoop select 1. */
portctrl |= SIO_IOBP_PORTCTRL_SNOOP_SELECT(1);
/* Set interrupt pin. */
portctrl |= SIO_IOBP_PORTCTRL_INT_PIN(int_pin);
if (acpi_mode) {
/* Enable ACPI interrupt mode. */
portctrl |= SIO_IOBP_PORTCTRL_ACPI_IRQ_EN;
/* Disable PCI config space. */
portctrl |= SIO_IOBP_PORTCTRL_PCI_CONF_DIS;
}
pch_iobp_update(SIO_IOBP_PORTCTRLX(sio_index), 0, portctrl);
}
/* Put Serial IO D23:F0 device into desired mode. */
static void serialio_d23_mode(int acpi_mode)
{
u32 portctrl = 0;
/* Snoop select 1. */
pch_iobp_update(SIO_IOBP_PORTCTRL1, 0,
SIO_IOBP_PORTCTRL1_SNOOP_SELECT(1));
if (acpi_mode) {
/* Enable ACPI interrupt mode. */
portctrl |= SIO_IOBP_PORTCTRL0_ACPI_IRQ_EN;
/* Disable PCI config space. */
portctrl |= SIO_IOBP_PORTCTRL0_PCI_CONF_DIS;
}
pch_iobp_update(SIO_IOBP_PORTCTRL0, 0, portctrl);
}
/* Enable LTR Auto Mode for D21:F1-F6. */
static void serialio_d21_ltr(struct resource *bar0)
{
u32 reg;
/* 1. Program BAR0 + 808h[2] = 0b */
reg = read32(res2mmio(bar0, SIO_REG_PPR_GEN, 0));
reg &= ~SIO_REG_PPR_GEN_LTR_MODE_MASK;
write32(res2mmio(bar0, SIO_REG_PPR_GEN, 0), reg);
/* 2. Program BAR0 + 804h[1:0] = 00b */
reg = read32(res2mmio(bar0, SIO_REG_PPR_RST, 0));
reg &= ~SIO_REG_PPR_RST_ASSERT;
write32(res2mmio(bar0, SIO_REG_PPR_RST, 0), reg);
/* 3. Program BAR0 + 804h[1:0] = 11b */
reg = read32(res2mmio(bar0, SIO_REG_PPR_RST, 0));
reg |= SIO_REG_PPR_RST_ASSERT;
write32(res2mmio(bar0, SIO_REG_PPR_RST, 0), reg);
/* 4. Program BAR0 + 814h[31:0] = 00000000h */
write32(res2mmio(bar0, SIO_REG_AUTO_LTR, 0), 0);
}
/* Enable LTR Auto Mode for D23:F0. */
static void serialio_d23_ltr(struct resource *bar0)
{
u32 reg;
/* Program BAR0 + 1008h[2] = 1b */
reg = read32(res2mmio(bar0, SIO_REG_SDIO_PPR_GEN, 0));
reg |= SIO_REG_PPR_GEN_LTR_MODE_MASK;
write32(res2mmio(bar0, SIO_REG_SDIO_PPR_GEN, 0), reg);
/* Program BAR0 + 1010h = 0x00000000 */
write32(res2mmio(bar0, SIO_REG_SDIO_PPR_SW_LTR, 0), 0);
/* Program BAR0 + 3Ch[30] = 1b */
reg = read32(res2mmio(bar0, SIO_REG_SDIO_PPR_CMD12, 0));
reg |= SIO_REG_SDIO_PPR_CMD12_B30;
write32(res2mmio(bar0, SIO_REG_SDIO_PPR_CMD12, 0), reg);
}
/* Select I2C voltage of 1.8V or 3.3V. */
static void serialio_i2c_voltage_sel(struct resource *bar0, u8 voltage)
{
u32 reg32 = read32(res2mmio(bar0, SIO_REG_PPR_GEN, 0));
reg32 &= ~SIO_REG_PPR_GEN_VOLTAGE_MASK;
reg32 |= SIO_REG_PPR_GEN_VOLTAGE(voltage);
write32(res2mmio(bar0, SIO_REG_PPR_GEN, 0), reg32);
}
/* Init sequence to be run once, done as part of D21:F0 (SDMA) init. */
static void serialio_init_once(int acpi_mode)
{
if (acpi_mode) {
/* Enable ACPI IRQ for IRQ13, IRQ7, IRQ6, IRQ5 in RCBA. */
RCBA32_OR(ACPIIRQEN, (1 << 13)|(1 << 7)|(1 << 6)|(1 << 5));
}
/* Program IOBP CB000154h[12,9:8,4:0] = 1001100011111b. */
pch_iobp_update(SIO_IOBP_GPIODF, ~0x0000131f, 0x0000131f);
/* Program IOBP CB000180h[5:0] = 111111b (undefined register) */
pch_iobp_update(0xcb000180, ~0x0000003f, 0x0000003f);
}
static void serialio_init(struct device *dev)
{
config_t *config = config_of(dev);
struct resource *bar0, *bar1;
int sio_index = -1;
printk(BIOS_DEBUG, "Initializing Serial IO device\n");
/* Ensure memory and bus master are enabled */
pci_or_config16(dev, PCI_COMMAND, PCI_COMMAND_MASTER | PCI_COMMAND_MEMORY);
/* Find BAR0 and BAR1 */
bar0 = find_resource(dev, PCI_BASE_ADDRESS_0);
if (!bar0)
return;
bar1 = find_resource(dev, PCI_BASE_ADDRESS_1);
if (!bar1)
return;
if (!config->sio_acpi_mode)
serialio_enable_clock(bar0);
switch (dev->path.pci.devfn) {
case PCH_DEVFN_SDMA: /* SDMA */
sio_index = SIO_ID_SDMA;
serialio_init_once(config->sio_acpi_mode);
serialio_d21_mode(sio_index, SIO_PIN_INTB,
config->sio_acpi_mode);
break;
case PCH_DEVFN_I2C0: /* I2C0 */
sio_index = SIO_ID_I2C0;
serialio_d21_ltr(bar0);
serialio_i2c_voltage_sel(bar0, config->sio_i2c0_voltage);
serialio_d21_mode(sio_index, SIO_PIN_INTC,
config->sio_acpi_mode);
break;
case PCH_DEVFN_I2C1: /* I2C1 */
sio_index = SIO_ID_I2C1;
serialio_d21_ltr(bar0);
serialio_i2c_voltage_sel(bar0, config->sio_i2c1_voltage);
serialio_d21_mode(sio_index, SIO_PIN_INTC,
config->sio_acpi_mode);
break;
case PCH_DEVFN_SPI0: /* SPI0 */
sio_index = SIO_ID_SPI0;
serialio_d21_ltr(bar0);
serialio_d21_mode(sio_index, SIO_PIN_INTC,
config->sio_acpi_mode);
break;
case PCH_DEVFN_SPI1: /* SPI1 */
sio_index = SIO_ID_SPI1;
serialio_d21_ltr(bar0);
serialio_d21_mode(sio_index, SIO_PIN_INTC,
config->sio_acpi_mode);
break;
case PCH_DEVFN_UART0: /* UART0 */
sio_index = SIO_ID_UART0;
if (!serialio_uart_is_debug(dev))
serialio_d21_ltr(bar0);
serialio_d21_mode(sio_index, SIO_PIN_INTD,
config->sio_acpi_mode);
break;
case PCH_DEVFN_UART1: /* UART1 */
sio_index = SIO_ID_UART1;
if (!serialio_uart_is_debug(dev))
serialio_d21_ltr(bar0);
serialio_d21_mode(sio_index, SIO_PIN_INTD,
config->sio_acpi_mode);
break;
case PCH_DEVFN_SDIO: /* SDIO */
sio_index = SIO_ID_SDIO;
serialio_d23_ltr(bar0);
serialio_d23_mode(config->sio_acpi_mode);
break;
default:
return;
}
if (config->sio_acpi_mode) {
struct global_nvs *gnvs;
/* Find ACPI NVS to update BARs */
gnvs = acpi_get_gnvs();
if (!gnvs)
return;
/* Save BAR0 and BAR1 to ACPI NVS */
gnvs->dev.bar0[sio_index] = (u32)bar0->base;
gnvs->dev.bar1[sio_index] = (u32)bar1->base;
/* Do not enable UART if it is used as debug port */
if (!serialio_uart_is_debug(dev))
gnvs->dev.enable[sio_index] = 1;
/* Put device in D3hot state via BAR1 */
if (dev->path.pci.devfn != PCH_DEVFN_SDMA)
serialio_enable_d3hot(bar1); /* all but SDMA */
}
}
static void serialio_set_resources(struct device *dev)
{
pci_dev_set_resources(dev);
#if CONFIG(INTEL_PCH_UART_CONSOLE)
/* Update UART base address if used for debug */
if (serialio_uart_is_debug(dev)) {
struct resource *res = find_resource(dev, PCI_BASE_ADDRESS_0);
if (res)
uartmem_setbaseaddr(res->base);
}
#endif
}
static struct device_operations device_ops = {
.read_resources = &pci_dev_read_resources,
.set_resources = &serialio_set_resources,
.enable_resources = &pci_dev_enable_resources,
.init = &serialio_init,
.ops_pci = &pci_dev_ops_pci,
};
static const unsigned short pci_device_ids[] = {
0x9c60, 0x9ce0, /* 0:15.0 - SDMA */
0x9c61, 0x9ce1, /* 0:15.1 - I2C0 */
0x9c62, 0x9ce2, /* 0:15.2 - I2C1 */
0x9c65, 0x9ce5, /* 0:15.3 - SPI0 */
0x9c66, 0x9ce6, /* 0:15.4 - SPI1 */
0x9c63, 0x9ce3, /* 0:15.5 - UART0 */
0x9c64, 0x9ce4, /* 0:15.6 - UART1 */
0x9c35, 0x9cb5, /* 0:17.0 - SDIO */
0
};
static const struct pci_driver pch_pcie __pci_driver = {
.ops = &device_ops,
.vendor = PCI_VENDOR_ID_INTEL,
.devices = pci_device_ids,
};
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