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1da177e4 LT |
1 | /* |
2 | * (c) 2003, 2004 Advanced Micro Devices, Inc. | |
3 | * Your use of this code is subject to the terms and conditions of the | |
4 | * GNU general public license version 2. See "COPYING" or | |
5 | * http://www.gnu.org/licenses/gpl.html | |
6 | */ | |
7 | ||
8 | struct powernow_k8_data { | |
9 | unsigned int cpu; | |
10 | ||
11 | u32 numps; /* number of p-states */ | |
12 | u32 batps; /* number of p-states supported on battery */ | |
13 | ||
14 | /* these values are constant when the PSB is used to determine | |
15 | * vid/fid pairings, but are modified during the ->target() call | |
16 | * when ACPI is used */ | |
17 | u32 rvo; /* ramp voltage offset */ | |
18 | u32 irt; /* isochronous relief time */ | |
19 | u32 vidmvs; /* usable value calculated from mvs */ | |
20 | u32 vstable; /* voltage stabilization time, units 20 us */ | |
21 | u32 plllock; /* pll lock time, units 1 us */ | |
22 | ||
23 | /* keep track of the current fid / vid */ | |
24 | u32 currvid, currfid; | |
25 | ||
26 | /* the powernow_table includes all frequency and vid/fid pairings: | |
27 | * fid are the lower 8 bits of the index, vid are the upper 8 bits. | |
28 | * frequency is in kHz */ | |
29 | struct cpufreq_frequency_table *powernow_table; | |
30 | ||
31 | #ifdef CONFIG_X86_POWERNOW_K8_ACPI | |
32 | /* the acpi table needs to be kept. it's only available if ACPI was | |
33 | * used to determine valid frequency/vid/fid states */ | |
34 | struct acpi_processor_performance acpi_data; | |
35 | #endif | |
36 | }; | |
37 | ||
38 | ||
39 | /* processor's cpuid instruction support */ | |
40 | #define CPUID_PROCESSOR_SIGNATURE 1 /* function 1 */ | |
41 | #define CPUID_XFAM 0x0ff00000 /* extended family */ | |
42 | #define CPUID_XFAM_K8 0 | |
43 | #define CPUID_XMOD 0x000f0000 /* extended model */ | |
44 | #define CPUID_XMOD_REV_E 0x00020000 | |
45 | #define CPUID_USE_XFAM_XMOD 0x00000f00 | |
46 | #define CPUID_GET_MAX_CAPABILITIES 0x80000000 | |
47 | #define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007 | |
48 | #define P_STATE_TRANSITION_CAPABLE 6 | |
49 | ||
50 | /* Model Specific Registers for p-state transitions. MSRs are 64-bit. For */ | |
51 | /* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and */ | |
52 | /* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */ | |
53 | /* the register number is placed in ecx, and the data is returned in edx:eax. */ | |
54 | ||
55 | #define MSR_FIDVID_CTL 0xc0010041 | |
56 | #define MSR_FIDVID_STATUS 0xc0010042 | |
57 | ||
58 | /* Field definitions within the FID VID Low Control MSR : */ | |
59 | #define MSR_C_LO_INIT_FID_VID 0x00010000 | |
60 | #define MSR_C_LO_NEW_VID 0x00001f00 | |
61 | #define MSR_C_LO_NEW_FID 0x0000002f | |
62 | #define MSR_C_LO_VID_SHIFT 8 | |
63 | ||
64 | /* Field definitions within the FID VID High Control MSR : */ | |
65 | #define MSR_C_HI_STP_GNT_TO 0x000fffff | |
66 | ||
67 | /* Field definitions within the FID VID Low Status MSR : */ | |
68 | #define MSR_S_LO_CHANGE_PENDING 0x80000000 /* cleared when completed */ | |
69 | #define MSR_S_LO_MAX_RAMP_VID 0x1f000000 | |
70 | #define MSR_S_LO_MAX_FID 0x003f0000 | |
71 | #define MSR_S_LO_START_FID 0x00003f00 | |
72 | #define MSR_S_LO_CURRENT_FID 0x0000003f | |
73 | ||
74 | /* Field definitions within the FID VID High Status MSR : */ | |
75 | #define MSR_S_HI_MAX_WORKING_VID 0x001f0000 | |
76 | #define MSR_S_HI_START_VID 0x00001f00 | |
77 | #define MSR_S_HI_CURRENT_VID 0x0000001f | |
78 | #define MSR_C_HI_STP_GNT_BENIGN 0x00000001 | |
79 | ||
80 | /* | |
81 | * There are restrictions frequencies have to follow: | |
82 | * - only 1 entry in the low fid table ( <=1.4GHz ) | |
83 | * - lowest entry in the high fid table must be >= 2 * the entry in the | |
84 | * low fid table | |
85 | * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry | |
86 | * in the low fid table | |
87 | * - the parts can only step at 200 MHz intervals, so 1.9 GHz is never valid | |
88 | * - lowest frequency must be >= interprocessor hypertransport link speed | |
89 | * (only applies to MP systems obviously) | |
90 | */ | |
91 | ||
92 | /* fids (frequency identifiers) are arranged in 2 tables - lo and hi */ | |
93 | #define LO_FID_TABLE_TOP 6 /* fid values marking the boundary */ | |
94 | #define HI_FID_TABLE_BOTTOM 8 /* between the low and high tables */ | |
95 | ||
96 | #define LO_VCOFREQ_TABLE_TOP 1400 /* corresponding vco frequency values */ | |
97 | #define HI_VCOFREQ_TABLE_BOTTOM 1600 | |
98 | ||
99 | #define MIN_FREQ_RESOLUTION 200 /* fids jump by 2 matching freq jumps by 200 */ | |
100 | ||
101 | #define MAX_FID 0x2a /* Spec only gives FID values as far as 5 GHz */ | |
102 | #define LEAST_VID 0x1e /* Lowest (numerically highest) useful vid value */ | |
103 | ||
104 | #define MIN_FREQ 800 /* Min and max freqs, per spec */ | |
105 | #define MAX_FREQ 5000 | |
106 | ||
107 | #define INVALID_FID_MASK 0xffffffc1 /* not a valid fid if these bits are set */ | |
108 | #define INVALID_VID_MASK 0xffffffe0 /* not a valid vid if these bits are set */ | |
109 | ||
110 | #define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */ | |
111 | ||
112 | #define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */ | |
113 | ||
114 | #define MAXIMUM_VID_STEPS 1 /* Current cpus only allow a single step of 25mV */ | |
115 | #define VST_UNITS_20US 20 /* Voltage Stabalization Time is in units of 20us */ | |
116 | ||
117 | /* | |
118 | * Most values of interest are enocoded in a single field of the _PSS | |
119 | * entries: the "control" value. | |
120 | */ | |
121 | ||
122 | #define IRT_SHIFT 30 | |
123 | #define RVO_SHIFT 28 | |
124 | #define PLL_L_SHIFT 20 | |
125 | #define MVS_SHIFT 18 | |
126 | #define VST_SHIFT 11 | |
127 | #define VID_SHIFT 6 | |
128 | #define IRT_MASK 3 | |
129 | #define RVO_MASK 3 | |
130 | #define PLL_L_MASK 0x7f | |
131 | #define MVS_MASK 3 | |
132 | #define VST_MASK 0x7f | |
133 | #define VID_MASK 0x1f | |
134 | #define FID_MASK 0x3f | |
135 | ||
136 | ||
137 | /* | |
138 | * Version 1.4 of the PSB table. This table is constructed by BIOS and is | |
139 | * to tell the OS's power management driver which VIDs and FIDs are | |
140 | * supported by this particular processor. | |
141 | * If the data in the PSB / PST is wrong, then this driver will program the | |
142 | * wrong values into hardware, which is very likely to lead to a crash. | |
143 | */ | |
144 | ||
145 | #define PSB_ID_STRING "AMDK7PNOW!" | |
146 | #define PSB_ID_STRING_LEN 10 | |
147 | ||
148 | #define PSB_VERSION_1_4 0x14 | |
149 | ||
150 | struct psb_s { | |
151 | u8 signature[10]; | |
152 | u8 tableversion; | |
153 | u8 flags1; | |
154 | u16 vstable; | |
155 | u8 flags2; | |
156 | u8 num_tables; | |
157 | u32 cpuid; | |
158 | u8 plllocktime; | |
159 | u8 maxfid; | |
160 | u8 maxvid; | |
161 | u8 numps; | |
162 | }; | |
163 | ||
164 | /* Pairs of fid/vid values are appended to the version 1.4 PSB table. */ | |
165 | struct pst_s { | |
166 | u8 fid; | |
167 | u8 vid; | |
168 | }; | |
169 | ||
170 | #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg) | |
171 | ||
172 | static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid); | |
173 | static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid); | |
174 | static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid); | |
175 | ||
176 | static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index); |