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 return ret; 47 48 /* Enable upper 128bytes of CMOS */ 49 writel(1 << 2, RCB_REG(RC)); 50 51 /* Early chipset init required before RAM init can work */ 52 uclass_first_device(UCLASS_NORTHBRIDGE, &dev); 53 54 ret = uclass_first_device(UCLASS_LPC, &lpc); 55 if (ret) 56 return ret; 57 if (!lpc) 58 return -ENODEV; 59 60 /* Cause the SATA device to do its early init */ 61 uclass_first_device(UCLASS_DISK, &dev); 62 63 return 0; 64 } 65 66 int cpu_set_flex_ratio_to_tdp_nominal(void) 67 { 68 msr_t flex_ratio, msr; 69 u8 nominal_ratio; 70 71 /* Check for Flex Ratio support */ 72 flex_ratio = msr_read(MSR_FLEX_RATIO); 73 if (!(flex_ratio.lo & FLEX_RATIO_EN)) 74 return -EINVAL; 75 76 /* Check for >0 configurable TDPs */ 77 msr = msr_read(MSR_PLATFORM_INFO); 78 if (((msr.hi >> 1) & 3) == 0) 79 return -EINVAL; 80 81 /* Use nominal TDP ratio for flex ratio */ 82 msr = msr_read(MSR_CONFIG_TDP_NOMINAL); 83 nominal_ratio = msr.lo & 0xff; 84 85 /* See if flex ratio is already set to nominal TDP ratio */ 86 if (((flex_ratio.lo >> 8) & 0xff) == nominal_ratio) 87 return 0; 88 89 /* Set flex ratio to nominal TDP ratio */ 90 flex_ratio.lo &= ~0xff00; 91 flex_ratio.lo |= nominal_ratio << 8; 92 flex_ratio.lo |= FLEX_RATIO_LOCK; 93 msr_write(MSR_FLEX_RATIO, flex_ratio); 94 95 /* Set flex ratio in soft reset data register bits 11:6 */ 96 clrsetbits_le32(RCB_REG(SOFT_RESET_DATA), 0x3f << 6, 97 (nominal_ratio & 0x3f) << 6); 98 99 debug("CPU: Soft reset to set up flex ratio\n"); 100 101 /* Set soft reset control to use register value */ 102 setbits_le32(RCB_REG(SOFT_RESET_CTRL), 1); 103 104 /* Issue warm reset, will be "CPU only" due to soft reset data */ 105 outb(0x0, IO_PORT_RESET); 106 outb(SYS_RST | RST_CPU, IO_PORT_RESET); 107 cpu_hlt(); 108 109 /* Not reached */ 110 return -EINVAL; 111 } 112