early_thermal.c

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/* SPDX-License-Identifier: GPL-2.0-or-later */
 
#include <device/mmio.h>
#include <device/pci_ops.h>
#include "pch.h"
#include "cpu/intel/model_2065x/model_2065x.h"
#include <cpu/x86/msr.h>
 
/* Early thermal init, must be done prior to giving ME its memory
   which is done at the end of raminit.  */
void early_thermal_init(void)
{
        pci_devfn_t dev;
        msr_t msr;
 
        dev = PCI_DEV(0x0, 0x1f, 0x6);
 
        /* Program address for temporary BAR.  */
        pci_write_config32(dev, 0x40, 0x40000000);
        pci_write_config32(dev, 0x44, 0x0);
 
        /* Activate temporary BAR.  */
        pci_write_config32(dev, 0x40,
                           pci_read_config32(dev, 0x40) | 5);
 
        /* Perform init.  */
        /* Configure TJmax.  */
        msr = rdmsr(MSR_TEMPERATURE_TARGET);
        write16((u16 *)0x40000012, ((msr.lo >> 16) & 0xff) << 6);
        /* Northbridge temperature slope and offset.  */
        write16((u16 *)0x40000016, 0x7746);
        /* Enable thermal data reporting, processor, PCH and northbridge.  */
        write16((u16 *)0x4000001a,
                (read16((u16 *)0x4000001a) & ~0xf) | 0x10f0);
 
        /* Disable temporary BAR.  */
        pci_write_config32(dev, 0x40,
                           pci_read_config32(dev, 0x40) & ~1);
        pci_write_config32(dev, 0x40, 0);
}