| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <console/console.h> |
| #include <device/mmio.h> |
| #include <intelblocks/cfg.h> |
| #include <intelblocks/thermal.h> |
| #include <soc/pci_devs.h> |
| |
| #define THERMAL_SENSOR_POWER_MANAGEMENT 0x1c |
| #define CATASTROPHIC_TRIP_POINT_MASK 0x1ff |
| #define MAX_TRIP_TEMP 205 |
| /* This is the safest default Trip Temp value */ |
| #define DEFAULT_TRIP_TEMP 50 |
| #define GET_LTT_VALUE(x) (((x) + 50) * (2)) |
| |
| static uint8_t get_thermal_trip_temp(void) |
| { |
| const struct soc_intel_common_config *common_config; |
| common_config = chip_get_common_soc_structure(); |
| |
| return common_config->pch_thermal_trip; |
| } |
| |
| /* PCH Low Temp Threshold (LTT) */ |
| static uint16_t pch_get_ltt_value(struct device *dev) |
| { |
| uint16_t ltt_value; |
| uint8_t thermal_config; |
| |
| thermal_config = get_thermal_trip_temp(); |
| if (!thermal_config) |
| thermal_config = DEFAULT_TRIP_TEMP; |
| |
| if (thermal_config > MAX_TRIP_TEMP) |
| die("Input PCH temp trip is higher than allowed range!"); |
| |
| /* Trip Point Temp = (LTT / 2 - 50 degree C) */ |
| ltt_value = GET_LTT_VALUE(thermal_config); |
| |
| return ltt_value; |
| } |
| |
| /* Enable thermal sensor power management */ |
| void pch_thermal_configuration(void) |
| { |
| uint16_t reg16; |
| uintptr_t thermalbar; |
| uintptr_t thermalbar_pm; |
| struct device *dev; |
| struct resource *res; |
| |
| dev = pcidev_path_on_root(PCH_DEVFN_THERMAL); |
| if (!dev) { |
| printk(BIOS_ERR, "ERROR: PCH_DEVFN_THERMAL device not found!\n"); |
| return; |
| } |
| |
| res = find_resource(dev, PCI_BASE_ADDRESS_0); |
| if (!res) { |
| printk(BIOS_ERR, "ERROR: PCH thermal device not found!\n"); |
| return; |
| } |
| |
| /* Get the base address of the resource */ |
| thermalbar = res->base; |
| |
| /* Get the required thermal address to write the register value */ |
| thermalbar_pm = thermalbar + THERMAL_SENSOR_POWER_MANAGEMENT; |
| |
| /* Set Low Temp Threshold (LTT) at TSPM offset 0x1c[8:0] */ |
| reg16 = read16((uint16_t *)thermalbar_pm); |
| reg16 &= ~CATASTROPHIC_TRIP_POINT_MASK; |
| /* Low Temp Threshold (LTT) */ |
| reg16 |= pch_get_ltt_value(dev); |
| write16((uint16_t *)thermalbar_pm, reg16); |
| } |