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/* SPDX-License-Identifier: GPL-2.0-only */
#include <acpi/acpi.h>
#include <acpi/acpigen.h>
#include <baseboard/variants.h>
#include <delay.h>
#include <device/pci_ops.h>
#include <gpio.h>
#include <timer.h>
#include <types.h>
#define GPU_1V8_PWR_EN GPP_E18
#define GPU_1V8_PG GPP_E20
#define NV33_PWR_EN GPP_A21
#define NV33_PG GPP_A22
#define NVVDD_PWR_EN GPP_E0
#define NVVDD_PG GPP_E16
#define PEXVDD_PWR_EN GPP_E10
#define PEXVDD_PG GPP_E17
#define FBVDD_PWR_EN GPP_A19
#define FBVDD_PG GPP_E4
#define GPU_PERST_L GPP_B3
#define GPU_ALLRAILS_PG GPP_E5
#define DEFAULT_PG_TIMEOUT_US 20000
#define VGAR_BYTE_OFFSET 5
/* Maximum size of PCI config space to save. */
#define GPU_CONFIG_SAVE_SPACE_BYTES 0x100
static bool gpu_powered_on;
struct power_rail_sequence {
const char *name;
/* This is the GPIO (output) connected to the VR's enable pin. */
gpio_t pwr_en_gpio;
bool pwr_en_active_low;
/* This is the GPIO (input) connected to the VR's power-good pin. */
gpio_t pg_gpio;
/* Delay after sequencing this rail. */
unsigned int delay_ms;
};
/* In GCOFF exit order (i.e., power-on order) */
static const struct power_rail_sequence gpu_on_seq[] = {
{ "GPU 1.8V", GPU_1V8_PWR_EN, false, GPU_1V8_PG, },
{ "NV3_3", NV33_PWR_EN, false, NV33_PG, },
{ "NVVDD+MSVDD", NVVDD_PWR_EN, false, NVVDD_PG, },
{ "PEXVDD", PEXVDD_PWR_EN, false, PEXVDD_PG, },
{ "FBVDD", FBVDD_PWR_EN, true, FBVDD_PG, },
};
/* In GCOFF entry order (i.e., power-off order) */
static const struct power_rail_sequence gpu_off_seq[] = {
{ "FBVDD", FBVDD_PWR_EN, true, FBVDD_PG, 0,},
{ "PEXVDD", PEXVDD_PWR_EN, false, PEXVDD_PG, 10,},
{ "NVVDD+MSVDD", NVVDD_PWR_EN, false, NVVDD_PG, 2,},
{ "NV3_3", NV33_PWR_EN, false, NV33_PG, 4,},
{ "GPU 1.8V", GPU_1V8_PWR_EN, false, GPU_1V8_PG, 0,},
};
enum rail_state {
RAIL_OFF = 0,
RAIL_ON = 1,
};
/* Assert the VR's enable pin, and wait until the VR's power-good is asserted. */
static bool sequence_rail(const struct power_rail_sequence *seq, enum rail_state state)
{
enum rail_state pwr_en_state = state;
bool result;
if (seq->pwr_en_active_low)
pwr_en_state = !pwr_en_state;
gpio_output(seq->pwr_en_gpio, pwr_en_state);
result = wait_us(DEFAULT_PG_TIMEOUT_US, gpio_get(seq->pg_gpio) == state) >= 0;
if (seq->delay_ms)
mdelay(seq->delay_ms);
return result;
}
static void dgpu_power_sequence_off(void)
{
/* Assert reset and clear power-good */
gpio_output(GPU_PERST_L, 0);
/* Inform the GPU that the power is no longer good. */
gpio_output(GPU_ALLRAILS_PG, 0);
for (size_t i = 0; i < ARRAY_SIZE(gpu_off_seq); i++) {
if (!sequence_rail(&gpu_off_seq[i], RAIL_OFF)) {
printk(BIOS_ERR, "Failed to disable %s rail, continuing!\n",
gpu_off_seq[i].name);
}
}
}
static void dgpu_power_sequence_on(void)
{
/* Assert PERST# */
gpio_output(GPU_PERST_L, 0);
for (size_t i = 0; i < ARRAY_SIZE(gpu_on_seq); i++) {
if (!sequence_rail(&gpu_on_seq[i], RAIL_ON)) {
printk(BIOS_ERR, "Failed to enable %s rail, sequencing back down!\n",
gpu_on_seq[i].name);
/* If an error occurred, then perform the power-off sequence and
return early to avoid setting GPU_ALLRAILS_PG and PERST_L. */
dgpu_power_sequence_off();
return;
}
}
/* Set power-good and release PERST# */
gpio_output(GPU_ALLRAILS_PG, 1);
mdelay(1);
gpio_output(GPU_PERST_L, 1);
printk(BIOS_INFO, "Sequenced GPU successfully\n");
mdelay(1);
gpu_powered_on = true;
}
void variant_init(void)
{
if (acpi_is_wakeup_s3())
return;
dgpu_power_sequence_on();
}
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