xref: /openbmc/u-boot/arch/x86/cpu/intel_common/cpu.c (revision 9d466f2f)
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