thermal_pci.c

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#include <console/console.h>
#include <device/device.h>
#include <device/mmio.h>
#include <intelblocks/thermal.h>
#include <soc/pci_devs.h>
 
#define THERMAL_SENSOR_POWER_MANAGEMENT 0x1c
#define CATASTROPHIC_TRIP_POINT_MASK 0x1ff
 
/* Enable thermal sensor power management */
void pch_thermal_configuration(void)
{
        uintptr_t thermalbar;
        uintptr_t thermalbar_pm;
        const struct device *dev;
        struct resource *res;
 
        dev = pcidev_path_on_root(PCH_DEVFN_THERMAL);
        if (!dev) {
                printk(BIOS_ERR, "PCH_DEVFN_THERMAL device not found!\n");
                return;
        }
 
        res = probe_resource(dev, PCI_BASE_ADDRESS_0);
        if (!res) {
                printk(BIOS_ERR, "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] */
        clrsetbits32((void *)thermalbar_pm, CATASTROPHIC_TRIP_POINT_MASK, pch_get_ltt_value());
}