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