| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* This file is part of the coreboot project. */ |
| |
| #include <device/mmio.h> |
| #include <assert.h> |
| #include <console/console.h> |
| #include <soc/addressmap.h> |
| #include <soc/pmc.h> |
| #include <soc/power.h> |
| |
| static struct tegra_pmc_regs * const pmc = (void *)TEGRA_PMC_BASE; |
| |
| enum { |
| POWER_GATE = 0, |
| POWER_UNGATE = 1, |
| }; |
| |
| static int partition_powered(int id) |
| { |
| if (read32(&pmc->pwrgate_status) & (0x1 << id)) |
| return POWER_UNGATE; |
| |
| return POWER_GATE; |
| } |
| |
| static const char *const power_gate_string[] = { |
| [POWER_GATE] = "Gat", |
| [POWER_UNGATE] = "Ungat", |
| }; |
| |
| static void power_gate_toggle_request(uint32_t id, int request) |
| { |
| printk(BIOS_INFO, "%sing power partition %d.\n", |
| power_gate_string[request], id); |
| |
| int part_powered = partition_powered(id); |
| |
| if (request == part_powered) { |
| printk(BIOS_INFO, "Partition %d already %sed.\n", id, |
| power_gate_string[request]); |
| return; |
| } |
| |
| uint32_t pwrgate_toggle = read32(&pmc->pwrgate_toggle); |
| pwrgate_toggle &= ~(PMC_PWRGATE_TOGGLE_PARTID_MASK); |
| pwrgate_toggle |= (id << PMC_PWRGATE_TOGGLE_PARTID_SHIFT); |
| pwrgate_toggle |= PMC_PWRGATE_TOGGLE_START; |
| write32(&pmc->pwrgate_toggle, pwrgate_toggle); |
| |
| // Wait for the request to be accepted. |
| while (read32(&pmc->pwrgate_toggle) & PMC_PWRGATE_TOGGLE_START) |
| ; |
| printk(BIOS_INFO, "Power gate toggle request accepted.\n"); |
| |
| while (1) { |
| part_powered = partition_powered(id); |
| if (request == part_powered) { |
| printk(BIOS_INFO, "Partition %d %sed.\n", id, |
| power_gate_string[request]); |
| return; |
| } |
| } |
| } |
| |
| void power_gate_partition(uint32_t id) |
| { |
| power_gate_toggle_request(id, POWER_GATE); |
| } |
| |
| void power_ungate_partition(uint32_t id) |
| { |
| power_gate_toggle_request(id, POWER_UNGATE); |
| } |
| |
| uint8_t pmc_rst_status(void) |
| { |
| return read32(&pmc->rst_status) & PMC_RST_STATUS_SOURCE_MASK; |
| } |
| |
| static const char *pmc_rst_status_str[PMC_RST_STATUS_NUM_SOURCES] = { |
| [PMC_RST_STATUS_SOURCE_POR] = "POR", |
| [PMC_RST_STATUS_SOURCE_WATCHDOG] = "Watchdog", |
| [PMC_RST_STATUS_SOURCE_SENSOR] = "Sensor", |
| [PMC_RST_STATUS_SOURCE_SW_MAIN] = "SW Main", |
| [PMC_RST_STATUS_SOURCE_LP0] = "LP0", |
| }; |
| |
| void pmc_print_rst_status(void) |
| { |
| uint8_t rst_status = pmc_rst_status(); |
| assert(rst_status < PMC_RST_STATUS_NUM_SOURCES); |
| printk(BIOS_INFO, "PMC Reset Status: %s\n", |
| pmc_rst_status_str[rst_status]); |
| } |
| |
| static int partition_clamp_on(int id) |
| { |
| return read32(&pmc->clamp_status) & (1 << id); |
| } |
| |
| void remove_clamps(int id) |
| { |
| if (!partition_clamp_on(id)) |
| return; |
| |
| /* Remove clamp */ |
| write32(&pmc->remove_clamping_cmd, (1 << id)); |
| |
| /* Wait for clamp off */ |
| while (partition_clamp_on(id)) |
| ; |
| } |
| |
| void pmc_override_pwr_det(uint32_t bits, uint32_t override) |
| { |
| uint32_t val = read32(&pmc->pwr_det_val); |
| val &= ~bits; |
| val |= (override & bits); |
| write32(&pmc->pwr_det_val, val); |
| } |