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
report_bist_failure(void)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
cpu_common_init(void)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
cpu_set_flex_ratio_to_tdp_nominal(void)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