2 * (c) 2003-2006 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
8 struct powernow_k8_data {
11 u32 numps; /* number of p-states */
12 u32 batps; /* number of p-states supported on battery */
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 u32 exttype; /* extended interface = 1 */
24 /* keep track of the current fid / vid or did */
25 u32 currvid, currfid, currdid;
27 /* the powernow_table includes all frequency and vid/fid pairings:
28 * fid are the lower 8 bits of the index, vid are the upper 8 bits.
29 * frequency is in kHz */
30 struct cpufreq_frequency_table *powernow_table;
32 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
33 /* the acpi table needs to be kept. it's only available if ACPI was
34 * used to determine valid frequency/vid/fid states */
35 struct acpi_processor_performance acpi_data;
37 /* we need to keep track of associated cores, but let cpufreq
38 * handle hotplug events - so just point at cpufreq pol->cpus
40 cpumask_t *available_cores;
44 /* processor's cpuid instruction support */
45 #define CPUID_PROCESSOR_SIGNATURE 1 /* function 1 */
46 #define CPUID_XFAM 0x0ff00000 /* extended family */
47 #define CPUID_XFAM_K8 0
48 #define CPUID_XMOD 0x000f0000 /* extended model */
49 #define CPUID_XMOD_REV_G 0x00060000
50 #define CPUID_XFAM_10H 0x00100000 /* family 0x10 */
51 #define CPUID_USE_XFAM_XMOD 0x00000f00
52 #define CPUID_GET_MAX_CAPABILITIES 0x80000000
53 #define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
54 #define P_STATE_TRANSITION_CAPABLE 6
56 /* Model Specific Registers for p-state transitions. MSRs are 64-bit. For */
57 /* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and */
58 /* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */
59 /* the register number is placed in ecx, and the data is returned in edx:eax. */
61 #define MSR_FIDVID_CTL 0xc0010041
62 #define MSR_FIDVID_STATUS 0xc0010042
64 /* Field definitions within the FID VID Low Control MSR : */
65 #define MSR_C_LO_INIT_FID_VID 0x00010000
66 #define MSR_C_LO_NEW_VID 0x00003f00
67 #define MSR_C_LO_NEW_FID 0x0000003f
68 #define MSR_C_LO_VID_SHIFT 8
70 /* Field definitions within the FID VID High Control MSR : */
71 #define MSR_C_HI_STP_GNT_TO 0x000fffff
73 /* Field definitions within the FID VID Low Status MSR : */
74 #define MSR_S_LO_CHANGE_PENDING 0x80000000 /* cleared when completed */
75 #define MSR_S_LO_MAX_RAMP_VID 0x3f000000
76 #define MSR_S_LO_MAX_FID 0x003f0000
77 #define MSR_S_LO_START_FID 0x00003f00
78 #define MSR_S_LO_CURRENT_FID 0x0000003f
80 /* Field definitions within the FID VID High Status MSR : */
81 #define MSR_S_HI_MIN_WORKING_VID 0x3f000000
82 #define MSR_S_HI_MAX_WORKING_VID 0x003f0000
83 #define MSR_S_HI_START_VID 0x00003f00
84 #define MSR_S_HI_CURRENT_VID 0x0000003f
85 #define MSR_C_HI_STP_GNT_BENIGN 0x00000001
88 /* Hardware Pstate _PSS and MSR definitions */
89 #define USE_HW_PSTATE 0x00000080
90 #define HW_PSTATE_FID_MASK 0x0000003f
91 #define HW_PSTATE_DID_MASK 0x000001c0
92 #define HW_PSTATE_DID_SHIFT 6
93 #define HW_PSTATE_MASK 0x00000007
94 #define HW_PSTATE_VALID_MASK 0x80000000
95 #define HW_FID_INDEX_SHIFT 8
96 #define HW_FID_INDEX_MASK 0x0000ff00
97 #define HW_DID_INDEX_SHIFT 16
98 #define HW_DID_INDEX_MASK 0x00ff0000
99 #define HW_WATTS_MASK 0xff
100 #define HW_PWR_DVR_MASK 0x300
101 #define HW_PWR_DVR_SHIFT 8
102 #define HW_PWR_MAX_MULT 3
103 #define MAX_HW_PSTATE 8 /* hw pstate supports up to 8 */
104 #define MSR_PSTATE_DEF_BASE 0xc0010064 /* base of Pstate MSRs */
105 #define MSR_PSTATE_STATUS 0xc0010063 /* Pstate Status MSR */
106 #define MSR_PSTATE_CTRL 0xc0010062 /* Pstate control MSR */
108 /* define the two driver architectures */
109 #define CPU_OPTERON 0
110 #define CPU_HW_PSTATE 1
114 * There are restrictions frequencies have to follow:
115 * - only 1 entry in the low fid table ( <=1.4GHz )
116 * - lowest entry in the high fid table must be >= 2 * the entry in the
118 * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
119 * in the low fid table
120 * - the parts can only step at <= 200 MHz intervals, odd fid values are
121 * supported in revision G and later revisions.
122 * - lowest frequency must be >= interprocessor hypertransport link speed
123 * (only applies to MP systems obviously)
126 /* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
127 #define LO_FID_TABLE_TOP 7 /* fid values marking the boundary */
128 #define HI_FID_TABLE_BOTTOM 8 /* between the low and high tables */
130 #define LO_VCOFREQ_TABLE_TOP 1400 /* corresponding vco frequency values */
131 #define HI_VCOFREQ_TABLE_BOTTOM 1600
133 #define MIN_FREQ_RESOLUTION 200 /* fids jump by 2 matching freq jumps by 200 */
135 #define MAX_FID 0x2a /* Spec only gives FID values as far as 5 GHz */
136 #define LEAST_VID 0x3e /* Lowest (numerically highest) useful vid value */
138 #define MIN_FREQ 800 /* Min and max freqs, per spec */
139 #define MAX_FREQ 5000
141 #define INVALID_FID_MASK 0xffffffc0 /* not a valid fid if these bits are set */
142 #define INVALID_VID_MASK 0xffffffc0 /* not a valid vid if these bits are set */
146 #define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */
148 #define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */
150 #define MAXIMUM_VID_STEPS 1 /* Current cpus only allow a single step of 25mV */
151 #define VST_UNITS_20US 20 /* Voltage Stabalization Time is in units of 20us */
154 * Most values of interest are enocoded in a single field of the _PSS
155 * entries: the "control" value.
160 #define EXT_TYPE_SHIFT 27
161 #define PLL_L_SHIFT 20
167 #define EXT_TYPE_MASK 1
168 #define PLL_L_MASK 0x7f
170 #define VST_MASK 0x7f
171 #define VID_MASK 0x1f
172 #define FID_MASK 0x1f
173 #define EXT_VID_MASK 0x3f
174 #define EXT_FID_MASK 0x3f
178 * Version 1.4 of the PSB table. This table is constructed by BIOS and is
179 * to tell the OS's power management driver which VIDs and FIDs are
180 * supported by this particular processor.
181 * If the data in the PSB / PST is wrong, then this driver will program the
182 * wrong values into hardware, which is very likely to lead to a crash.
185 #define PSB_ID_STRING "AMDK7PNOW!"
186 #define PSB_ID_STRING_LEN 10
188 #define PSB_VERSION_1_4 0x14
204 /* Pairs of fid/vid values are appended to the version 1.4 PSB table. */
210 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg)
212 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid);
213 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
214 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
216 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
218 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
219 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
222 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
226 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
228 cpu_set(0, cpu_sharedcore_mask[0]);