1 /* 2 * Copyright (c) 2016 Google, Inc 3 * 4 * SPDX-License-Identifier: GPL-2.0 5 */ 6 7 #include <common.h> 8 #include <dm.h> 9 #include <errno.h> 10 #include <asm/cpu_common.h> 11 #include <asm/intel_regs.h> 12 #include <asm/lapic.h> 13 #include <asm/lpc_common.h> 14 #include <asm/msr.h> 15 #include <asm/mtrr.h> 16 #include <asm/post.h> 17 #include <asm/microcode.h> 18 19 DECLARE_GLOBAL_DATA_PTR; 20 21 static int report_bist_failure(void) 22 { 23 if (gd->arch.bist != 0) { 24 post_code(POST_BIST_FAILURE); 25 printf("BIST failed: %08x\n", gd->arch.bist); 26 return -EFAULT; 27 } 28 29 return 0; 30 } 31 32 int cpu_common_init(void) 33 { 34 struct udevice *dev, *lpc; 35 int ret; 36 37 /* Halt if there was a built in self test failure */ 38 ret = report_bist_failure(); 39 if (ret) 40 return ret; 41 42 enable_lapic(); 43 44 ret = microcode_update_intel(); 45 if (ret && ret != -EEXIST) { 46 debug("%s: Microcode update failure (err=%d)\n", __func__, ret); 47 return ret; 48 } 49 50 /* Enable upper 128bytes of CMOS */ 51 writel(1 << 2, RCB_REG(RC)); 52 53 /* Early chipset init required before RAM init can work */ 54 uclass_first_device(UCLASS_NORTHBRIDGE, &dev); 55 56 ret = uclass_first_device(UCLASS_LPC, &lpc); 57 if (ret) 58 return ret; 59 if (!lpc) 60 return -ENODEV; 61 62 /* Cause the SATA device to do its early init */ 63 uclass_first_device(UCLASS_AHCI, &dev); 64 65 return 0; 66 } 67 68 int cpu_set_flex_ratio_to_tdp_nominal(void) 69 { 70 msr_t flex_ratio, msr; 71 u8 nominal_ratio; 72 73 /* Check for Flex Ratio support */ 74 flex_ratio = msr_read(MSR_FLEX_RATIO); 75 if (!(flex_ratio.lo & FLEX_RATIO_EN)) 76 return -EINVAL; 77 78 /* Check for >0 configurable TDPs */ 79 msr = msr_read(MSR_PLATFORM_INFO); 80 if (((msr.hi >> 1) & 3) == 0) 81 return -EINVAL; 82 83 /* Use nominal TDP ratio for flex ratio */ 84 msr = msr_read(MSR_CONFIG_TDP_NOMINAL); 85 nominal_ratio = msr.lo & 0xff; 86 87 /* See if flex ratio is already set to nominal TDP ratio */ 88 if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio) 89 return 0; 90 91 /* Set flex ratio to nominal TDP ratio */ 92 flex_ratio.lo &= ~0xff00; 93 flex_ratio.lo |= nominal_ratio << 8; 94 flex_ratio.lo |= FLEX_RATIO_LOCK; 95 msr_write(MSR_FLEX_RATIO, flex_ratio); 96 97 /* Set flex ratio in soft reset data register bits 11:6 */ 98 clrsetbits_le32(RCB_REG(SOFT_RESET_DATA), 0x3f << 6, 99 (nominal_ratio & 0x3f) << 6); 100 101 debug("CPU: Soft reset to set up flex ratio\n"); 102 103 /* Set soft reset control to use register value */ 104 setbits_le32(RCB_REG(SOFT_RESET_CTRL), 1); 105 106 /* Issue warm reset, will be "CPU only" due to soft reset data */ 107 outb(0x0, IO_PORT_RESET); 108 outb(SYS_RST | RST_CPU, IO_PORT_RESET); 109 cpu_hlt(); 110 111 /* Not reached */ 112 return -EINVAL; 113 } 114