1#if defined(__i386__) || defined(__x86_64__)
2#include <unistd.h>
3#include <errno.h>
4#include <stdio.h>
5#include <stdint.h>
6
7#include <pci/pci.h>
8
9#include "helpers/helpers.h"
10
11#define MSR_AMD_PSTATE_STATUS	0xc0010063
12#define MSR_AMD_PSTATE		0xc0010064
13#define MSR_AMD_PSTATE_LIMIT	0xc0010061
14
15union msr_pstate {
16	struct {
17		unsigned fid:6;
18		unsigned did:3;
19		unsigned vid:7;
20		unsigned res1:6;
21		unsigned nbdid:1;
22		unsigned res2:2;
23		unsigned nbvid:7;
24		unsigned iddval:8;
25		unsigned idddiv:2;
26		unsigned res3:21;
27		unsigned en:1;
28	} bits;
29	unsigned long long val;
30};
31
32static int get_did(int family, union msr_pstate pstate)
33{
34	int t;
35
36	if (family == 0x12)
37		t = pstate.val & 0xf;
38	else
39		t = pstate.bits.did;
40
41	return t;
42}
43
44static int get_cof(int family, union msr_pstate pstate)
45{
46	int t;
47	int fid, did;
48
49	did = get_did(family, pstate);
50
51	t = 0x10;
52	fid = pstate.bits.fid;
53	if (family == 0x11)
54		t = 0x8;
55
56	return (100 * (fid + t)) >> did;
57}
58
59/* Needs:
60 * cpu          -> the cpu that gets evaluated
61 * cpu_family   -> The cpu's family (0x10, 0x12,...)
62 * boots_states -> how much boost states the machines support
63 *
64 * Fills up:
65 * pstates -> a pointer to an array of size MAX_HW_PSTATES
66 *            must be initialized with zeros.
67 *            All available  HW pstates (including boost states)
68 * no      -> amount of pstates above array got filled up with
69 *
70 * returns zero on success, -1 on failure
71 */
72int decode_pstates(unsigned int cpu, unsigned int cpu_family,
73		   int boost_states, unsigned long *pstates, int *no)
74{
75	int i, psmax, pscur;
76	union msr_pstate pstate;
77	unsigned long long val;
78
79	/* Only read out frequencies from HW when CPU might be boostable
80	   to keep the code as short and clean as possible.
81	   Otherwise frequencies are exported via ACPI tables.
82	*/
83	if (cpu_family < 0x10 || cpu_family == 0x14)
84		return -1;
85
86	if (read_msr(cpu, MSR_AMD_PSTATE_LIMIT, &val))
87		return -1;
88
89	psmax = (val >> 4) & 0x7;
90
91	if (read_msr(cpu, MSR_AMD_PSTATE_STATUS, &val))
92		return -1;
93
94	pscur = val & 0x7;
95
96	pscur += boost_states;
97	psmax += boost_states;
98	for (i = 0; i <= psmax; i++) {
99		if (i >= MAX_HW_PSTATES) {
100			fprintf(stderr, "HW pstates [%d] exceeding max [%d]\n",
101				psmax, MAX_HW_PSTATES);
102			return -1;
103		}
104		if (read_msr(cpu, MSR_AMD_PSTATE + i, &pstate.val))
105			return -1;
106		pstates[i] = get_cof(cpu_family, pstate);
107	}
108	*no = i;
109	return 0;
110}
111
112int amd_pci_get_num_boost_states(int *active, int *states)
113{
114	struct pci_access *pci_acc;
115	struct pci_dev *device;
116	uint8_t val = 0;
117
118	*active = *states = 0;
119
120	device = pci_slot_func_init(&pci_acc, 0x18, 4);
121
122	if (device == NULL)
123		return -ENODEV;
124
125	val = pci_read_byte(device, 0x15c);
126	if (val & 3)
127		*active = 1;
128	else
129		*active = 0;
130	*states = (val >> 2) & 7;
131
132	pci_cleanup(pci_acc);
133	return 0;
134}
135#endif /* defined(__i386__) || defined(__x86_64__) */
136