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
10 HW_PSTATE_INVALID = 0xff,
21 struct powernow_k8_data {
24 u32 numps; /* number of p-states */
25 u32 batps; /* number of p-states supported on battery */
26 u32 max_hw_pstate; /* maximum legal hardware pstate */
28 /* these values are constant when the PSB is used to determine
29 * vid/fid pairings, but are modified during the ->target() call
30 * when ACPI is used */
31 u32 rvo; /* ramp voltage offset */
32 u32 irt; /* isochronous relief time */
33 u32 vidmvs; /* usable value calculated from mvs */
34 u32 vstable; /* voltage stabilization time, units 20 us */
35 u32 plllock; /* pll lock time, units 1 us */
36 u32 exttype; /* extended interface = 1 */
38 /* keep track of the current fid / vid or pstate */
41 enum pstate currpstate;
43 /* the powernow_table includes all frequency and vid/fid pairings:
44 * fid are the lower 8 bits of the index, vid are the upper 8 bits.
45 * frequency is in kHz */
46 struct cpufreq_frequency_table *powernow_table;
48 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
49 /* the acpi table needs to be kept. it's only available if ACPI was
50 * used to determine valid frequency/vid/fid states */
51 struct acpi_processor_performance acpi_data;
53 /* we need to keep track of associated cores, but let cpufreq
54 * handle hotplug events - so just point at cpufreq pol->cpus
56 struct cpumask *available_cores;
60 /* processor's cpuid instruction support */
61 #define CPUID_PROCESSOR_SIGNATURE 1 /* function 1 */
62 #define CPUID_XFAM 0x0ff00000 /* extended family */
63 #define CPUID_XFAM_K8 0
64 #define CPUID_XMOD 0x000f0000 /* extended model */
65 #define CPUID_XMOD_REV_MASK 0x000c0000
66 #define CPUID_XFAM_10H 0x00100000 /* family 0x10 */
67 #define CPUID_USE_XFAM_XMOD 0x00000f00
68 #define CPUID_GET_MAX_CAPABILITIES 0x80000000
69 #define CPUID_FREQ_VOLT_CAPABILITIES 0x80000007
70 #define P_STATE_TRANSITION_CAPABLE 6
72 /* Model Specific Registers for p-state transitions. MSRs are 64-bit. For */
73 /* writes (wrmsr - opcode 0f 30), the register number is placed in ecx, and */
74 /* the value to write is placed in edx:eax. For reads (rdmsr - opcode 0f 32), */
75 /* the register number is placed in ecx, and the data is returned in edx:eax. */
77 #define MSR_FIDVID_CTL 0xc0010041
78 #define MSR_FIDVID_STATUS 0xc0010042
80 /* Field definitions within the FID VID Low Control MSR : */
81 #define MSR_C_LO_INIT_FID_VID 0x00010000
82 #define MSR_C_LO_NEW_VID 0x00003f00
83 #define MSR_C_LO_NEW_FID 0x0000003f
84 #define MSR_C_LO_VID_SHIFT 8
86 /* Field definitions within the FID VID High Control MSR : */
87 #define MSR_C_HI_STP_GNT_TO 0x000fffff
89 /* Field definitions within the FID VID Low Status MSR : */
90 #define MSR_S_LO_CHANGE_PENDING 0x80000000 /* cleared when completed */
91 #define MSR_S_LO_MAX_RAMP_VID 0x3f000000
92 #define MSR_S_LO_MAX_FID 0x003f0000
93 #define MSR_S_LO_START_FID 0x00003f00
94 #define MSR_S_LO_CURRENT_FID 0x0000003f
96 /* Field definitions within the FID VID High Status MSR : */
97 #define MSR_S_HI_MIN_WORKING_VID 0x3f000000
98 #define MSR_S_HI_MAX_WORKING_VID 0x003f0000
99 #define MSR_S_HI_START_VID 0x00003f00
100 #define MSR_S_HI_CURRENT_VID 0x0000003f
101 #define MSR_C_HI_STP_GNT_BENIGN 0x00000001
104 /* Hardware Pstate _PSS and MSR definitions */
105 #define USE_HW_PSTATE 0x00000080
106 #define HW_PSTATE_MASK 0x00000007
107 #define HW_PSTATE_VALID_MASK 0x80000000
108 #define HW_PSTATE_MAX_MASK 0x000000f0
109 #define HW_PSTATE_MAX_SHIFT 4
110 #define MSR_PSTATE_DEF_BASE 0xc0010064 /* base of Pstate MSRs */
111 #define MSR_PSTATE_STATUS 0xc0010063 /* Pstate Status MSR */
112 #define MSR_PSTATE_CTRL 0xc0010062 /* Pstate control MSR */
113 #define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
115 /* define the two driver architectures */
116 #define CPU_OPTERON 0
117 #define CPU_HW_PSTATE 1
121 * There are restrictions frequencies have to follow:
122 * - only 1 entry in the low fid table ( <=1.4GHz )
123 * - lowest entry in the high fid table must be >= 2 * the entry in the
125 * - lowest entry in the high fid table must be a <= 200MHz + 2 * the entry
126 * in the low fid table
127 * - the parts can only step at <= 200 MHz intervals, odd fid values are
128 * supported in revision G and later revisions.
129 * - lowest frequency must be >= interprocessor hypertransport link speed
130 * (only applies to MP systems obviously)
133 /* fids (frequency identifiers) are arranged in 2 tables - lo and hi */
134 #define LO_FID_TABLE_TOP 7 /* fid values marking the boundary */
135 #define HI_FID_TABLE_BOTTOM 8 /* between the low and high tables */
137 #define LO_VCOFREQ_TABLE_TOP 1400 /* corresponding vco frequency values */
138 #define HI_VCOFREQ_TABLE_BOTTOM 1600
140 #define MIN_FREQ_RESOLUTION 200 /* fids jump by 2 matching freq jumps by 200 */
142 #define MAX_FID 0x2a /* Spec only gives FID values as far as 5 GHz */
143 #define LEAST_VID 0x3e /* Lowest (numerically highest) useful vid value */
145 #define MIN_FREQ 800 /* Min and max freqs, per spec */
146 #define MAX_FREQ 5000
148 #define INVALID_FID_MASK 0xffffffc0 /* not a valid fid if these bits are set */
149 #define INVALID_VID_MASK 0xffffffc0 /* not a valid vid if these bits are set */
153 #define STOP_GRANT_5NS 1 /* min poss memory access latency for voltage change */
155 #define PLL_LOCK_CONVERSION (1000/5) /* ms to ns, then divide by clock period */
157 #define MAXIMUM_VID_STEPS 1 /* Current cpus only allow a single step of 25mV */
158 #define VST_UNITS_20US 20 /* Voltage Stabilization Time is in units of 20us */
161 * Most values of interest are encoded in a single field of the _PSS
162 * entries: the "control" value.
167 #define EXT_TYPE_SHIFT 27
168 #define PLL_L_SHIFT 20
174 #define EXT_TYPE_MASK 1
175 #define PLL_L_MASK 0x7f
177 #define VST_MASK 0x7f
178 #define VID_MASK 0x1f
179 #define FID_MASK 0x1f
180 #define EXT_VID_MASK 0x3f
181 #define EXT_FID_MASK 0x3f
185 * Version 1.4 of the PSB table. This table is constructed by BIOS and is
186 * to tell the OS's power management driver which VIDs and FIDs are
187 * supported by this particular processor.
188 * If the data in the PSB / PST is wrong, then this driver will program the
189 * wrong values into hardware, which is very likely to lead to a crash.
192 #define PSB_ID_STRING "AMDK7PNOW!"
193 #define PSB_ID_STRING_LEN 10
195 #define PSB_VERSION_1_4 0x14
211 /* Pairs of fid/vid values are appended to the version 1.4 PSB table. */
217 #define dprintk(msg...) cpufreq_debug_printk(CPUFREQ_DEBUG_DRIVER, "powernow-k8", msg)
219 static int core_voltage_pre_transition(struct powernow_k8_data *data, u32 reqvid);
220 static int core_voltage_post_transition(struct powernow_k8_data *data, u32 reqvid);
221 static int core_frequency_transition(struct powernow_k8_data *data, u32 reqfid);
223 static void powernow_k8_acpi_pst_values(struct powernow_k8_data *data, unsigned int index);
225 #ifdef CONFIG_X86_POWERNOW_K8_ACPI
226 static int fill_powernow_table_pstate(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
227 static int fill_powernow_table_fidvid(struct powernow_k8_data *data, struct cpufreq_frequency_table *powernow_table);
231 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
235 static inline void define_siblings(int cpu, cpumask_t cpu_sharedcore_mask[])
237 cpu_set(0, cpu_sharedcore_mask[0]);