Angel Pons | 0612b27 | 2020-04-05 15:46:56 +0200 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
Sumeet Pawnikar | 047cac7 | 2019-05-29 23:38:15 +0530 | [diff] [blame] | 2 | |
| 3 | #include <console/console.h> |
| 4 | #include <device/mmio.h> |
Kyösti Mälkki | 32d47eb | 2019-09-28 00:00:30 +0300 | [diff] [blame] | 5 | #include <intelblocks/cfg.h> |
Sumeet Pawnikar | 047cac7 | 2019-05-29 23:38:15 +0530 | [diff] [blame] | 6 | #include <intelblocks/thermal.h> |
| 7 | #include <soc/pci_devs.h> |
| 8 | |
| 9 | #define THERMAL_SENSOR_POWER_MANAGEMENT 0x1c |
| 10 | #define CATASTROPHIC_TRIP_POINT_MASK 0x1ff |
| 11 | #define MAX_TRIP_TEMP 205 |
| 12 | /* This is the safest default Trip Temp value */ |
| 13 | #define DEFAULT_TRIP_TEMP 50 |
| 14 | #define GET_LTT_VALUE(x) (((x) + 50) * (2)) |
| 15 | |
| 16 | static uint8_t get_thermal_trip_temp(void) |
| 17 | { |
| 18 | const struct soc_intel_common_config *common_config; |
| 19 | common_config = chip_get_common_soc_structure(); |
| 20 | |
| 21 | return common_config->pch_thermal_trip; |
| 22 | } |
| 23 | |
| 24 | /* PCH Low Temp Threshold (LTT) */ |
| 25 | static uint16_t pch_get_ltt_value(struct device *dev) |
| 26 | { |
| 27 | uint16_t ltt_value; |
| 28 | uint8_t thermal_config; |
| 29 | |
| 30 | thermal_config = get_thermal_trip_temp(); |
| 31 | if (!thermal_config) |
| 32 | thermal_config = DEFAULT_TRIP_TEMP; |
| 33 | |
| 34 | if (thermal_config > MAX_TRIP_TEMP) |
| 35 | die("Input PCH temp trip is higher than allowed range!"); |
| 36 | |
| 37 | /* Trip Point Temp = (LTT / 2 - 50 degree C) */ |
| 38 | ltt_value = GET_LTT_VALUE(thermal_config); |
| 39 | |
| 40 | return ltt_value; |
| 41 | } |
| 42 | |
| 43 | /* Enable thermal sensor power management */ |
| 44 | void pch_thermal_configuration(void) |
| 45 | { |
| 46 | uint16_t reg16; |
| 47 | uintptr_t thermalbar; |
| 48 | uintptr_t thermalbar_pm; |
| 49 | struct device *dev; |
| 50 | struct resource *res; |
| 51 | |
| 52 | dev = pcidev_path_on_root(PCH_DEVFN_THERMAL); |
| 53 | if (!dev) { |
| 54 | printk(BIOS_ERR, "ERROR: PCH_DEVFN_THERMAL device not found!\n"); |
| 55 | return; |
| 56 | } |
| 57 | |
Angel Pons | c1bfbe0 | 2021-11-03 13:18:53 +0100 | [diff] [blame^] | 58 | res = probe_resource(dev, PCI_BASE_ADDRESS_0); |
Sumeet Pawnikar | 047cac7 | 2019-05-29 23:38:15 +0530 | [diff] [blame] | 59 | if (!res) { |
| 60 | printk(BIOS_ERR, "ERROR: PCH thermal device not found!\n"); |
| 61 | return; |
| 62 | } |
| 63 | |
| 64 | /* Get the base address of the resource */ |
| 65 | thermalbar = res->base; |
| 66 | |
| 67 | /* Get the required thermal address to write the register value */ |
| 68 | thermalbar_pm = thermalbar + THERMAL_SENSOR_POWER_MANAGEMENT; |
| 69 | |
| 70 | /* Set Low Temp Threshold (LTT) at TSPM offset 0x1c[8:0] */ |
| 71 | reg16 = read16((uint16_t *)thermalbar_pm); |
| 72 | reg16 &= ~CATASTROPHIC_TRIP_POINT_MASK; |
| 73 | /* Low Temp Threshold (LTT) */ |
| 74 | reg16 |= pch_get_ltt_value(dev); |
| 75 | write16((uint16_t *)thermalbar_pm, reg16); |
| 76 | } |