/*
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* Copyright (c) 2016 Google, Inc
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*
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* SPDX-License-Identifier: GPL-2.0
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <asm/cpu_common.h>
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#include <asm/intel_regs.h>
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#include <asm/lapic.h>
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#include <asm/lpc_common.h>
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#include <asm/msr.h>
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#include <asm/mtrr.h>
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#include <asm/post.h>
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#include <asm/microcode.h>
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DECLARE_GLOBAL_DATA_PTR;
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static int report_bist_failure(void)
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{
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if (gd->arch.bist != 0) {
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post_code(POST_BIST_FAILURE);
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printf("BIST failed: %08x\n", gd->arch.bist);
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return -EFAULT;
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}
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return 0;
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}
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int cpu_common_init(void)
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{
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struct udevice *dev, *lpc;
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int ret;
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/* Halt if there was a built in self test failure */
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ret = report_bist_failure();
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if (ret)
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return ret;
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enable_lapic();
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ret = microcode_update_intel();
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if (ret && ret != -EEXIST) {
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debug("%s: Microcode update failure (err=%d)\n", __func__, ret);
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return ret;
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}
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/* Enable upper 128bytes of CMOS */
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writel(1 << 2, RCB_REG(RC));
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/* Early chipset init required before RAM init can work */
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uclass_first_device(UCLASS_NORTHBRIDGE, &dev);
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ret = uclass_first_device(UCLASS_LPC, &lpc);
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if (ret)
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return ret;
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if (!lpc)
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return -ENODEV;
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/* Cause the SATA device to do its early init */
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uclass_first_device(UCLASS_AHCI, &dev);
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return 0;
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}
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int cpu_set_flex_ratio_to_tdp_nominal(void)
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{
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msr_t flex_ratio, msr;
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u8 nominal_ratio;
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/* Check for Flex Ratio support */
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flex_ratio = msr_read(MSR_FLEX_RATIO);
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if (!(flex_ratio.lo & FLEX_RATIO_EN))
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return -EINVAL;
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/* Check for >0 configurable TDPs */
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msr = msr_read(MSR_PLATFORM_INFO);
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if (((msr.hi >> 1) & 3) == 0)
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return -EINVAL;
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/* Use nominal TDP ratio for flex ratio */
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msr = msr_read(MSR_CONFIG_TDP_NOMINAL);
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nominal_ratio = msr.lo & 0xff;
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/* See if flex ratio is already set to nominal TDP ratio */
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if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio)
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return 0;
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/* Set flex ratio to nominal TDP ratio */
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flex_ratio.lo &= ~0xff00;
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flex_ratio.lo |= nominal_ratio << 8;
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flex_ratio.lo |= FLEX_RATIO_LOCK;
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msr_write(MSR_FLEX_RATIO, flex_ratio);
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/* Set flex ratio in soft reset data register bits 11:6 */
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clrsetbits_le32(RCB_REG(SOFT_RESET_DATA), 0x3f << 6,
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(nominal_ratio & 0x3f) << 6);
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debug("CPU: Soft reset to set up flex ratio\n");
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/* Set soft reset control to use register value */
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setbits_le32(RCB_REG(SOFT_RESET_CTRL), 1);
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/* Issue warm reset, will be "CPU only" due to soft reset data */
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outb(0x0, IO_PORT_RESET);
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outb(SYS_RST | RST_CPU, IO_PORT_RESET);
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cpu_hlt();
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/* Not reached */
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return -EINVAL;
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}
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