Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2002 - 2005 Benjamin Herrenschmidt <benh@kernel.crashing.org> |
| 3 | * and Markus Demleitner <msdemlei@cl.uni-heidelberg.de> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License version 2 as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This driver adds basic cpufreq support for SMU & 970FX based G5 Macs, |
| 10 | * that is iMac G5 and latest single CPU desktop. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/config.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/types.h> |
| 16 | #include <linux/errno.h> |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/delay.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/slab.h> |
| 21 | #include <linux/cpufreq.h> |
| 22 | #include <linux/init.h> |
| 23 | #include <linux/completion.h> |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame^] | 24 | #include <linux/mutex.h> |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 25 | #include <asm/prom.h> |
| 26 | #include <asm/machdep.h> |
| 27 | #include <asm/irq.h> |
| 28 | #include <asm/sections.h> |
| 29 | #include <asm/cputable.h> |
| 30 | #include <asm/time.h> |
| 31 | #include <asm/smu.h> |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 32 | #include <asm/pmac_pfunc.h> |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 33 | |
| 34 | #undef DEBUG |
| 35 | |
| 36 | #ifdef DEBUG |
| 37 | #define DBG(fmt...) printk(fmt) |
| 38 | #else |
| 39 | #define DBG(fmt...) |
| 40 | #endif |
| 41 | |
| 42 | /* see 970FX user manual */ |
| 43 | |
| 44 | #define SCOM_PCR 0x0aa001 /* PCR scom addr */ |
| 45 | |
| 46 | #define PCR_HILO_SELECT 0x80000000U /* 1 = PCR, 0 = PCRH */ |
| 47 | #define PCR_SPEED_FULL 0x00000000U /* 1:1 speed value */ |
| 48 | #define PCR_SPEED_HALF 0x00020000U /* 1:2 speed value */ |
| 49 | #define PCR_SPEED_QUARTER 0x00040000U /* 1:4 speed value */ |
| 50 | #define PCR_SPEED_MASK 0x000e0000U /* speed mask */ |
| 51 | #define PCR_SPEED_SHIFT 17 |
| 52 | #define PCR_FREQ_REQ_VALID 0x00010000U /* freq request valid */ |
| 53 | #define PCR_VOLT_REQ_VALID 0x00008000U /* volt request valid */ |
| 54 | #define PCR_TARGET_TIME_MASK 0x00006000U /* target time */ |
| 55 | #define PCR_STATLAT_MASK 0x00001f00U /* STATLAT value */ |
| 56 | #define PCR_SNOOPLAT_MASK 0x000000f0U /* SNOOPLAT value */ |
| 57 | #define PCR_SNOOPACC_MASK 0x0000000fU /* SNOOPACC value */ |
| 58 | |
| 59 | #define SCOM_PSR 0x408001 /* PSR scom addr */ |
| 60 | /* warning: PSR is a 64 bits register */ |
| 61 | #define PSR_CMD_RECEIVED 0x2000000000000000U /* command received */ |
| 62 | #define PSR_CMD_COMPLETED 0x1000000000000000U /* command completed */ |
| 63 | #define PSR_CUR_SPEED_MASK 0x0300000000000000U /* current speed */ |
| 64 | #define PSR_CUR_SPEED_SHIFT (56) |
| 65 | |
| 66 | /* |
| 67 | * The G5 only supports two frequencies (Quarter speed is not supported) |
| 68 | */ |
| 69 | #define CPUFREQ_HIGH 0 |
| 70 | #define CPUFREQ_LOW 1 |
| 71 | |
| 72 | static struct cpufreq_frequency_table g5_cpu_freqs[] = { |
| 73 | {CPUFREQ_HIGH, 0}, |
| 74 | {CPUFREQ_LOW, 0}, |
| 75 | {0, CPUFREQ_TABLE_END}, |
| 76 | }; |
| 77 | |
| 78 | static struct freq_attr* g5_cpu_freqs_attr[] = { |
| 79 | &cpufreq_freq_attr_scaling_available_freqs, |
| 80 | NULL, |
| 81 | }; |
| 82 | |
| 83 | /* Power mode data is an array of the 32 bits PCR values to use for |
Adrian Bunk | 943ffb5 | 2006-01-10 00:10:13 +0100 | [diff] [blame] | 84 | * the various frequencies, retrieved from the device-tree |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 85 | */ |
| 86 | static u32 *g5_pmode_data; |
| 87 | static int g5_pmode_max; |
| 88 | static int g5_pmode_cur; |
| 89 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 90 | static void (*g5_switch_volt)(int speed_mode); |
| 91 | static int (*g5_switch_freq)(int speed_mode); |
| 92 | static int (*g5_query_freq)(void); |
| 93 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame^] | 94 | static DEFINE_MUTEX(g5_switch_mutex); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 95 | |
| 96 | |
| 97 | static struct smu_sdbp_fvt *g5_fvt_table; /* table of op. points */ |
| 98 | static int g5_fvt_count; /* number of op. points */ |
| 99 | static int g5_fvt_cur; /* current op. point */ |
| 100 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 101 | /* |
| 102 | * SMU based voltage switching for Neo2 platforms |
| 103 | */ |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 104 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 105 | static void g5_smu_switch_volt(int speed_mode) |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 106 | { |
| 107 | struct smu_simple_cmd cmd; |
| 108 | |
| 109 | DECLARE_COMPLETION(comp); |
| 110 | smu_queue_simple(&cmd, SMU_CMD_POWER_COMMAND, 8, smu_done_complete, |
| 111 | &comp, 'V', 'S', 'L', 'E', 'W', |
| 112 | 0xff, g5_fvt_cur+1, speed_mode); |
| 113 | wait_for_completion(&comp); |
| 114 | } |
| 115 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 116 | /* |
| 117 | * Platform function based voltage/vdnap switching for Neo2 |
| 118 | */ |
| 119 | |
| 120 | static struct pmf_function *pfunc_set_vdnap0; |
| 121 | static struct pmf_function *pfunc_vdnap0_complete; |
| 122 | |
| 123 | static void g5_vdnap_switch_volt(int speed_mode) |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 124 | { |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 125 | struct pmf_args args; |
| 126 | u32 slew, done = 0; |
| 127 | unsigned long timeout; |
| 128 | |
| 129 | slew = (speed_mode == CPUFREQ_LOW) ? 1 : 0; |
| 130 | args.count = 1; |
| 131 | args.u[0].p = &slew; |
| 132 | |
| 133 | pmf_call_one(pfunc_set_vdnap0, &args); |
| 134 | |
| 135 | /* It's an irq GPIO so we should be able to just block here, |
| 136 | * I'll do that later after I've properly tested the IRQ code for |
| 137 | * platform functions |
| 138 | */ |
| 139 | timeout = jiffies + HZ/10; |
| 140 | while(!time_after(jiffies, timeout)) { |
| 141 | args.count = 1; |
| 142 | args.u[0].p = &done; |
| 143 | pmf_call_one(pfunc_vdnap0_complete, &args); |
| 144 | if (done) |
| 145 | break; |
| 146 | msleep(1); |
| 147 | } |
| 148 | if (done == 0) |
| 149 | printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n"); |
| 150 | } |
| 151 | |
| 152 | |
| 153 | /* |
| 154 | * SCOM based frequency switching for 970FX rev3 |
| 155 | */ |
| 156 | static int g5_scom_switch_freq(int speed_mode) |
| 157 | { |
| 158 | unsigned long flags; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 159 | int to; |
| 160 | |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 161 | /* If frequency is going up, first ramp up the voltage */ |
| 162 | if (speed_mode < g5_pmode_cur) |
| 163 | g5_switch_volt(speed_mode); |
| 164 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 165 | local_irq_save(flags); |
| 166 | |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 167 | /* Clear PCR high */ |
| 168 | scom970_write(SCOM_PCR, 0); |
| 169 | /* Clear PCR low */ |
| 170 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | 0); |
| 171 | /* Set PCR low */ |
| 172 | scom970_write(SCOM_PCR, PCR_HILO_SELECT | |
| 173 | g5_pmode_data[speed_mode]); |
| 174 | |
| 175 | /* Wait for completion */ |
| 176 | for (to = 0; to < 10; to++) { |
| 177 | unsigned long psr = scom970_read(SCOM_PSR); |
| 178 | |
| 179 | if ((psr & PSR_CMD_RECEIVED) == 0 && |
| 180 | (((psr >> PSR_CUR_SPEED_SHIFT) ^ |
| 181 | (g5_pmode_data[speed_mode] >> PCR_SPEED_SHIFT)) & 0x3) |
| 182 | == 0) |
| 183 | break; |
| 184 | if (psr & PSR_CMD_COMPLETED) |
| 185 | break; |
| 186 | udelay(100); |
| 187 | } |
| 188 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 189 | local_irq_restore(flags); |
| 190 | |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 191 | /* If frequency is going down, last ramp the voltage */ |
| 192 | if (speed_mode > g5_pmode_cur) |
| 193 | g5_switch_volt(speed_mode); |
| 194 | |
| 195 | g5_pmode_cur = speed_mode; |
| 196 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; |
| 197 | |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 198 | return 0; |
| 199 | } |
| 200 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 201 | static int g5_scom_query_freq(void) |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 202 | { |
| 203 | unsigned long psr = scom970_read(SCOM_PSR); |
| 204 | int i; |
| 205 | |
| 206 | for (i = 0; i <= g5_pmode_max; i++) |
| 207 | if ((((psr >> PSR_CUR_SPEED_SHIFT) ^ |
| 208 | (g5_pmode_data[i] >> PCR_SPEED_SHIFT)) & 0x3) == 0) |
| 209 | break; |
| 210 | return i; |
| 211 | } |
| 212 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 213 | /* |
| 214 | * Platform function based voltage switching for PowerMac7,2 & 7,3 |
| 215 | */ |
| 216 | |
| 217 | static struct pmf_function *pfunc_cpu0_volt_high; |
| 218 | static struct pmf_function *pfunc_cpu0_volt_low; |
| 219 | static struct pmf_function *pfunc_cpu1_volt_high; |
| 220 | static struct pmf_function *pfunc_cpu1_volt_low; |
| 221 | |
| 222 | static void g5_pfunc_switch_volt(int speed_mode) |
| 223 | { |
| 224 | if (speed_mode == CPUFREQ_HIGH) { |
| 225 | if (pfunc_cpu0_volt_high) |
| 226 | pmf_call_one(pfunc_cpu0_volt_high, NULL); |
| 227 | if (pfunc_cpu1_volt_high) |
| 228 | pmf_call_one(pfunc_cpu1_volt_high, NULL); |
| 229 | } else { |
| 230 | if (pfunc_cpu0_volt_low) |
| 231 | pmf_call_one(pfunc_cpu0_volt_low, NULL); |
| 232 | if (pfunc_cpu1_volt_low) |
| 233 | pmf_call_one(pfunc_cpu1_volt_low, NULL); |
| 234 | } |
| 235 | msleep(10); /* should be faster , to fix */ |
| 236 | } |
| 237 | |
| 238 | /* |
| 239 | * Platform function based frequency switching for PowerMac7,2 & 7,3 |
| 240 | */ |
| 241 | |
| 242 | static struct pmf_function *pfunc_cpu_setfreq_high; |
| 243 | static struct pmf_function *pfunc_cpu_setfreq_low; |
| 244 | static struct pmf_function *pfunc_cpu_getfreq; |
| 245 | static struct pmf_function *pfunc_slewing_done;; |
| 246 | |
| 247 | static int g5_pfunc_switch_freq(int speed_mode) |
| 248 | { |
| 249 | struct pmf_args args; |
| 250 | u32 done = 0; |
| 251 | unsigned long timeout; |
| 252 | |
| 253 | /* If frequency is going up, first ramp up the voltage */ |
| 254 | if (speed_mode < g5_pmode_cur) |
| 255 | g5_switch_volt(speed_mode); |
| 256 | |
| 257 | /* Do it */ |
| 258 | if (speed_mode == CPUFREQ_HIGH) |
| 259 | pmf_call_one(pfunc_cpu_setfreq_high, NULL); |
| 260 | else |
| 261 | pmf_call_one(pfunc_cpu_setfreq_low, NULL); |
| 262 | |
| 263 | /* It's an irq GPIO so we should be able to just block here, |
| 264 | * I'll do that later after I've properly tested the IRQ code for |
| 265 | * platform functions |
| 266 | */ |
| 267 | timeout = jiffies + HZ/10; |
| 268 | while(!time_after(jiffies, timeout)) { |
| 269 | args.count = 1; |
| 270 | args.u[0].p = &done; |
| 271 | pmf_call_one(pfunc_slewing_done, &args); |
| 272 | if (done) |
| 273 | break; |
| 274 | msleep(1); |
| 275 | } |
| 276 | if (done == 0) |
| 277 | printk(KERN_WARNING "cpufreq: Timeout in clock slewing !\n"); |
| 278 | |
| 279 | /* If frequency is going down, last ramp the voltage */ |
| 280 | if (speed_mode > g5_pmode_cur) |
| 281 | g5_switch_volt(speed_mode); |
| 282 | |
| 283 | g5_pmode_cur = speed_mode; |
| 284 | ppc_proc_freq = g5_cpu_freqs[speed_mode].frequency * 1000ul; |
| 285 | |
| 286 | return 0; |
| 287 | } |
| 288 | |
| 289 | static int g5_pfunc_query_freq(void) |
| 290 | { |
| 291 | struct pmf_args args; |
| 292 | u32 val = 0; |
| 293 | |
| 294 | args.count = 1; |
| 295 | args.u[0].p = &val; |
| 296 | pmf_call_one(pfunc_cpu_getfreq, &args); |
| 297 | return val ? CPUFREQ_HIGH : CPUFREQ_LOW; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Fake voltage switching for platforms with missing support |
| 302 | */ |
| 303 | |
| 304 | static void g5_dummy_switch_volt(int speed_mode) |
| 305 | { |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Common interface to the cpufreq core |
| 310 | */ |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 311 | |
| 312 | static int g5_cpufreq_verify(struct cpufreq_policy *policy) |
| 313 | { |
| 314 | return cpufreq_frequency_table_verify(policy, g5_cpu_freqs); |
| 315 | } |
| 316 | |
| 317 | static int g5_cpufreq_target(struct cpufreq_policy *policy, |
| 318 | unsigned int target_freq, unsigned int relation) |
| 319 | { |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 320 | unsigned int newstate = 0; |
| 321 | struct cpufreq_freqs freqs; |
| 322 | int rc; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 323 | |
| 324 | if (cpufreq_frequency_table_target(policy, g5_cpu_freqs, |
| 325 | target_freq, relation, &newstate)) |
| 326 | return -EINVAL; |
| 327 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 328 | if (g5_pmode_cur == newstate) |
| 329 | return 0; |
| 330 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame^] | 331 | mutex_lock(&g5_switch_mutex); |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 332 | |
| 333 | freqs.old = g5_cpu_freqs[g5_pmode_cur].frequency; |
| 334 | freqs.new = g5_cpu_freqs[newstate].frequency; |
| 335 | freqs.cpu = 0; |
| 336 | |
| 337 | cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE); |
| 338 | rc = g5_switch_freq(newstate); |
| 339 | cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE); |
| 340 | |
Ingo Molnar | 14cc3e2 | 2006-03-26 01:37:14 -0800 | [diff] [blame^] | 341 | mutex_unlock(&g5_switch_mutex); |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 342 | |
| 343 | return rc; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | static unsigned int g5_cpufreq_get_speed(unsigned int cpu) |
| 347 | { |
| 348 | return g5_cpu_freqs[g5_pmode_cur].frequency; |
| 349 | } |
| 350 | |
| 351 | static int g5_cpufreq_cpu_init(struct cpufreq_policy *policy) |
| 352 | { |
| 353 | if (policy->cpu != 0) |
| 354 | return -ENODEV; |
| 355 | |
| 356 | policy->governor = CPUFREQ_DEFAULT_GOVERNOR; |
| 357 | policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL; |
| 358 | policy->cur = g5_cpu_freqs[g5_query_freq()].frequency; |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 359 | policy->cpus = cpu_possible_map; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 360 | cpufreq_frequency_table_get_attr(g5_cpu_freqs, policy->cpu); |
| 361 | |
| 362 | return cpufreq_frequency_table_cpuinfo(policy, |
| 363 | g5_cpu_freqs); |
| 364 | } |
| 365 | |
| 366 | |
| 367 | static struct cpufreq_driver g5_cpufreq_driver = { |
| 368 | .name = "powermac", |
| 369 | .owner = THIS_MODULE, |
| 370 | .flags = CPUFREQ_CONST_LOOPS, |
| 371 | .init = g5_cpufreq_cpu_init, |
| 372 | .verify = g5_cpufreq_verify, |
| 373 | .target = g5_cpufreq_target, |
| 374 | .get = g5_cpufreq_get_speed, |
| 375 | .attr = g5_cpu_freqs_attr, |
| 376 | }; |
| 377 | |
| 378 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 379 | static int __init g5_neo2_cpufreq_init(struct device_node *cpus) |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 380 | { |
| 381 | struct device_node *cpunode; |
| 382 | unsigned int psize, ssize; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 383 | unsigned long max_freq; |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 384 | char *freq_method, *volt_method; |
| 385 | u32 *valp, pvr_hi; |
| 386 | int use_volts_vdnap = 0; |
| 387 | int use_volts_smu = 0; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 388 | int rc = -ENODEV; |
| 389 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 390 | /* Check supported platforms */ |
| 391 | if (machine_is_compatible("PowerMac8,1") || |
| 392 | machine_is_compatible("PowerMac8,2") || |
| 393 | machine_is_compatible("PowerMac9,1")) |
| 394 | use_volts_smu = 1; |
| 395 | else if (machine_is_compatible("PowerMac11,2")) |
| 396 | use_volts_vdnap = 1; |
| 397 | else |
| 398 | return -ENODEV; |
| 399 | |
| 400 | /* Get first CPU node */ |
| 401 | for (cpunode = NULL; |
| 402 | (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) { |
| 403 | u32 *reg = |
| 404 | (u32 *)get_property(cpunode, "reg", NULL); |
| 405 | if (reg == NULL || (*reg) != 0) |
| 406 | continue; |
| 407 | if (!strcmp(cpunode->type, "cpu")) |
| 408 | break; |
| 409 | } |
| 410 | if (cpunode == NULL) { |
| 411 | printk(KERN_ERR "cpufreq: Can't find any CPU 0 node\n"); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 412 | return -ENODEV; |
| 413 | } |
| 414 | |
| 415 | /* Check 970FX for now */ |
| 416 | valp = (u32 *)get_property(cpunode, "cpu-version", NULL); |
| 417 | if (!valp) { |
| 418 | DBG("No cpu-version property !\n"); |
| 419 | goto bail_noprops; |
| 420 | } |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 421 | pvr_hi = (*valp) >> 16; |
| 422 | if (pvr_hi != 0x3c && pvr_hi != 0x44) { |
| 423 | printk(KERN_ERR "cpufreq: Unsupported CPU version\n"); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 424 | goto bail_noprops; |
| 425 | } |
| 426 | |
| 427 | /* Look for the powertune data in the device-tree */ |
| 428 | g5_pmode_data = (u32 *)get_property(cpunode, "power-mode-data",&psize); |
| 429 | if (!g5_pmode_data) { |
| 430 | DBG("No power-mode-data !\n"); |
| 431 | goto bail_noprops; |
| 432 | } |
| 433 | g5_pmode_max = psize / sizeof(u32) - 1; |
| 434 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 435 | if (use_volts_smu) { |
| 436 | struct smu_sdbp_header *shdr; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 437 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 438 | /* Look for the FVT table */ |
| 439 | shdr = smu_get_sdb_partition(SMU_SDB_FVT_ID, NULL); |
| 440 | if (!shdr) |
| 441 | goto bail_noprops; |
| 442 | g5_fvt_table = (struct smu_sdbp_fvt *)&shdr[1]; |
| 443 | ssize = (shdr->len * sizeof(u32)) - |
| 444 | sizeof(struct smu_sdbp_header); |
| 445 | g5_fvt_count = ssize / sizeof(struct smu_sdbp_fvt); |
| 446 | g5_fvt_cur = 0; |
| 447 | |
| 448 | /* Sanity checking */ |
| 449 | if (g5_fvt_count < 1 || g5_pmode_max < 1) |
| 450 | goto bail_noprops; |
| 451 | |
| 452 | g5_switch_volt = g5_smu_switch_volt; |
| 453 | volt_method = "SMU"; |
| 454 | } else if (use_volts_vdnap) { |
| 455 | struct device_node *root; |
| 456 | |
| 457 | root = of_find_node_by_path("/"); |
| 458 | if (root == NULL) { |
| 459 | printk(KERN_ERR "cpufreq: Can't find root of " |
| 460 | "device tree\n"); |
| 461 | goto bail_noprops; |
| 462 | } |
| 463 | pfunc_set_vdnap0 = pmf_find_function(root, "set-vdnap0"); |
| 464 | pfunc_vdnap0_complete = |
| 465 | pmf_find_function(root, "slewing-done"); |
| 466 | if (pfunc_set_vdnap0 == NULL || |
| 467 | pfunc_vdnap0_complete == NULL) { |
| 468 | printk(KERN_ERR "cpufreq: Can't find required " |
| 469 | "platform function\n"); |
| 470 | goto bail_noprops; |
| 471 | } |
| 472 | |
| 473 | g5_switch_volt = g5_vdnap_switch_volt; |
| 474 | volt_method = "GPIO"; |
| 475 | } else { |
| 476 | g5_switch_volt = g5_dummy_switch_volt; |
| 477 | volt_method = "none"; |
| 478 | } |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 479 | |
| 480 | /* |
| 481 | * From what I see, clock-frequency is always the maximal frequency. |
| 482 | * The current driver can not slew sysclk yet, so we really only deal |
| 483 | * with powertune steps for now. We also only implement full freq and |
| 484 | * half freq in this version. So far, I haven't yet seen a machine |
| 485 | * supporting anything else. |
| 486 | */ |
| 487 | valp = (u32 *)get_property(cpunode, "clock-frequency", NULL); |
| 488 | if (!valp) |
| 489 | return -ENODEV; |
| 490 | max_freq = (*valp)/1000; |
| 491 | g5_cpu_freqs[0].frequency = max_freq; |
| 492 | g5_cpu_freqs[1].frequency = max_freq/2; |
| 493 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 494 | /* Set callbacks */ |
| 495 | g5_switch_freq = g5_scom_switch_freq; |
| 496 | g5_query_freq = g5_scom_query_freq; |
| 497 | freq_method = "SCOM"; |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 498 | |
| 499 | /* Force apply current frequency to make sure everything is in |
| 500 | * sync (voltage is right for example). Firmware may leave us with |
| 501 | * a strange setting ... |
| 502 | */ |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 503 | g5_switch_volt(CPUFREQ_HIGH); |
| 504 | msleep(10); |
| 505 | g5_pmode_cur = -1; |
| 506 | g5_switch_freq(g5_query_freq()); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 507 | |
| 508 | printk(KERN_INFO "Registering G5 CPU frequency driver\n"); |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 509 | printk(KERN_INFO "Frequency method: %s, Voltage method: %s\n", |
| 510 | freq_method, volt_method); |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 511 | printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", |
| 512 | g5_cpu_freqs[1].frequency/1000, |
| 513 | g5_cpu_freqs[0].frequency/1000, |
| 514 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); |
| 515 | |
| 516 | rc = cpufreq_register_driver(&g5_cpufreq_driver); |
| 517 | |
| 518 | /* We keep the CPU node on hold... hopefully, Apple G5 don't have |
| 519 | * hotplug CPU with a dynamic device-tree ... |
| 520 | */ |
| 521 | return rc; |
| 522 | |
| 523 | bail_noprops: |
| 524 | of_node_put(cpunode); |
| 525 | |
| 526 | return rc; |
| 527 | } |
| 528 | |
Benjamin Herrenschmidt | 9a699ae | 2006-01-07 11:45:28 +1100 | [diff] [blame] | 529 | static int __init g5_pm72_cpufreq_init(struct device_node *cpus) |
| 530 | { |
| 531 | struct device_node *cpuid = NULL, *hwclock = NULL, *cpunode = NULL; |
| 532 | u8 *eeprom = NULL; |
| 533 | u32 *valp; |
| 534 | u64 max_freq, min_freq, ih, il; |
| 535 | int has_volt = 1, rc = 0; |
| 536 | |
| 537 | /* Get first CPU node */ |
| 538 | for (cpunode = NULL; |
| 539 | (cpunode = of_get_next_child(cpus, cpunode)) != NULL;) { |
| 540 | if (!strcmp(cpunode->type, "cpu")) |
| 541 | break; |
| 542 | } |
| 543 | if (cpunode == NULL) { |
| 544 | printk(KERN_ERR "cpufreq: Can't find any CPU node\n"); |
| 545 | return -ENODEV; |
| 546 | } |
| 547 | |
| 548 | /* Lookup the cpuid eeprom node */ |
| 549 | cpuid = of_find_node_by_path("/u3@0,f8000000/i2c@f8001000/cpuid@a0"); |
| 550 | if (cpuid != NULL) |
| 551 | eeprom = (u8 *)get_property(cpuid, "cpuid", NULL); |
| 552 | if (eeprom == NULL) { |
| 553 | printk(KERN_ERR "cpufreq: Can't find cpuid EEPROM !\n"); |
| 554 | rc = -ENODEV; |
| 555 | goto bail; |
| 556 | } |
| 557 | |
| 558 | /* Lookup the i2c hwclock */ |
| 559 | for (hwclock = NULL; |
| 560 | (hwclock = of_find_node_by_name(hwclock, "i2c-hwclock")) != NULL;){ |
| 561 | char *loc = get_property(hwclock, "hwctrl-location", NULL); |
| 562 | if (loc == NULL) |
| 563 | continue; |
| 564 | if (strcmp(loc, "CPU CLOCK")) |
| 565 | continue; |
| 566 | if (!get_property(hwclock, "platform-get-frequency", NULL)) |
| 567 | continue; |
| 568 | break; |
| 569 | } |
| 570 | if (hwclock == NULL) { |
| 571 | printk(KERN_ERR "cpufreq: Can't find i2c clock chip !\n"); |
| 572 | rc = -ENODEV; |
| 573 | goto bail; |
| 574 | } |
| 575 | |
| 576 | DBG("cpufreq: i2c clock chip found: %s\n", hwclock->full_name); |
| 577 | |
| 578 | /* Now get all the platform functions */ |
| 579 | pfunc_cpu_getfreq = |
| 580 | pmf_find_function(hwclock, "get-frequency"); |
| 581 | pfunc_cpu_setfreq_high = |
| 582 | pmf_find_function(hwclock, "set-frequency-high"); |
| 583 | pfunc_cpu_setfreq_low = |
| 584 | pmf_find_function(hwclock, "set-frequency-low"); |
| 585 | pfunc_slewing_done = |
| 586 | pmf_find_function(hwclock, "slewing-done"); |
| 587 | pfunc_cpu0_volt_high = |
| 588 | pmf_find_function(hwclock, "set-voltage-high-0"); |
| 589 | pfunc_cpu0_volt_low = |
| 590 | pmf_find_function(hwclock, "set-voltage-low-0"); |
| 591 | pfunc_cpu1_volt_high = |
| 592 | pmf_find_function(hwclock, "set-voltage-high-1"); |
| 593 | pfunc_cpu1_volt_low = |
| 594 | pmf_find_function(hwclock, "set-voltage-low-1"); |
| 595 | |
| 596 | /* Check we have minimum requirements */ |
| 597 | if (pfunc_cpu_getfreq == NULL || pfunc_cpu_setfreq_high == NULL || |
| 598 | pfunc_cpu_setfreq_low == NULL || pfunc_slewing_done == NULL) { |
| 599 | printk(KERN_ERR "cpufreq: Can't find platform functions !\n"); |
| 600 | rc = -ENODEV; |
| 601 | goto bail; |
| 602 | } |
| 603 | |
| 604 | /* Check that we have complete sets */ |
| 605 | if (pfunc_cpu0_volt_high == NULL || pfunc_cpu0_volt_low == NULL) { |
| 606 | pmf_put_function(pfunc_cpu0_volt_high); |
| 607 | pmf_put_function(pfunc_cpu0_volt_low); |
| 608 | pfunc_cpu0_volt_high = pfunc_cpu0_volt_low = NULL; |
| 609 | has_volt = 0; |
| 610 | } |
| 611 | if (!has_volt || |
| 612 | pfunc_cpu1_volt_high == NULL || pfunc_cpu1_volt_low == NULL) { |
| 613 | pmf_put_function(pfunc_cpu1_volt_high); |
| 614 | pmf_put_function(pfunc_cpu1_volt_low); |
| 615 | pfunc_cpu1_volt_high = pfunc_cpu1_volt_low = NULL; |
| 616 | } |
| 617 | |
| 618 | /* Note: The device tree also contains a "platform-set-values" |
| 619 | * function for which I haven't quite figured out the usage. It |
| 620 | * might have to be called on init and/or wakeup, I'm not too sure |
| 621 | * but things seem to work fine without it so far ... |
| 622 | */ |
| 623 | |
| 624 | /* Get max frequency from device-tree */ |
| 625 | valp = (u32 *)get_property(cpunode, "clock-frequency", NULL); |
| 626 | if (!valp) { |
| 627 | printk(KERN_ERR "cpufreq: Can't find CPU frequency !\n"); |
| 628 | rc = -ENODEV; |
| 629 | goto bail; |
| 630 | } |
| 631 | |
| 632 | max_freq = (*valp)/1000; |
| 633 | |
| 634 | /* Now calculate reduced frequency by using the cpuid input freq |
| 635 | * ratio. This requires 64 bits math unless we are willing to lose |
| 636 | * some precision |
| 637 | */ |
| 638 | ih = *((u32 *)(eeprom + 0x10)); |
| 639 | il = *((u32 *)(eeprom + 0x20)); |
| 640 | min_freq = 0; |
| 641 | if (ih != 0 && il != 0) |
| 642 | min_freq = (max_freq * il) / ih; |
| 643 | |
| 644 | /* Sanity check */ |
| 645 | if (min_freq >= max_freq || min_freq < 1000) { |
| 646 | printk(KERN_ERR "cpufreq: Can't calculate low frequency !\n"); |
| 647 | rc = -ENODEV; |
| 648 | goto bail; |
| 649 | } |
| 650 | g5_cpu_freqs[0].frequency = max_freq; |
| 651 | g5_cpu_freqs[1].frequency = min_freq; |
| 652 | |
| 653 | /* Set callbacks */ |
| 654 | g5_switch_volt = g5_pfunc_switch_volt; |
| 655 | g5_switch_freq = g5_pfunc_switch_freq; |
| 656 | g5_query_freq = g5_pfunc_query_freq; |
| 657 | |
| 658 | /* Force apply current frequency to make sure everything is in |
| 659 | * sync (voltage is right for example). Firmware may leave us with |
| 660 | * a strange setting ... |
| 661 | */ |
| 662 | g5_switch_volt(CPUFREQ_HIGH); |
| 663 | msleep(10); |
| 664 | g5_pmode_cur = -1; |
| 665 | g5_switch_freq(g5_query_freq()); |
| 666 | |
| 667 | printk(KERN_INFO "Registering G5 CPU frequency driver\n"); |
| 668 | printk(KERN_INFO "Frequency method: i2c/pfunc, " |
| 669 | "Voltage method: %s\n", has_volt ? "i2c/pfunc" : "none"); |
| 670 | printk(KERN_INFO "Low: %d Mhz, High: %d Mhz, Cur: %d MHz\n", |
| 671 | g5_cpu_freqs[1].frequency/1000, |
| 672 | g5_cpu_freqs[0].frequency/1000, |
| 673 | g5_cpu_freqs[g5_pmode_cur].frequency/1000); |
| 674 | |
| 675 | rc = cpufreq_register_driver(&g5_cpufreq_driver); |
| 676 | bail: |
| 677 | if (rc != 0) { |
| 678 | pmf_put_function(pfunc_cpu_getfreq); |
| 679 | pmf_put_function(pfunc_cpu_setfreq_high); |
| 680 | pmf_put_function(pfunc_cpu_setfreq_low); |
| 681 | pmf_put_function(pfunc_slewing_done); |
| 682 | pmf_put_function(pfunc_cpu0_volt_high); |
| 683 | pmf_put_function(pfunc_cpu0_volt_low); |
| 684 | pmf_put_function(pfunc_cpu1_volt_high); |
| 685 | pmf_put_function(pfunc_cpu1_volt_low); |
| 686 | } |
| 687 | of_node_put(hwclock); |
| 688 | of_node_put(cpuid); |
| 689 | of_node_put(cpunode); |
| 690 | |
| 691 | return rc; |
| 692 | } |
| 693 | |
| 694 | static int __init g5_rm31_cpufreq_init(struct device_node *cpus) |
| 695 | { |
| 696 | /* NYI */ |
| 697 | return 0; |
| 698 | } |
| 699 | |
| 700 | static int __init g5_cpufreq_init(void) |
| 701 | { |
| 702 | struct device_node *cpus; |
| 703 | int rc; |
| 704 | |
| 705 | cpus = of_find_node_by_path("/cpus"); |
| 706 | if (cpus == NULL) { |
| 707 | DBG("No /cpus node !\n"); |
| 708 | return -ENODEV; |
| 709 | } |
| 710 | |
| 711 | if (machine_is_compatible("PowerMac7,2") || |
| 712 | machine_is_compatible("PowerMac7,3")) |
| 713 | rc = g5_pm72_cpufreq_init(cpus); |
| 714 | else if (machine_is_compatible("RackMac3,1")) |
| 715 | rc = g5_rm31_cpufreq_init(cpus); |
| 716 | else |
| 717 | rc = g5_neo2_cpufreq_init(cpus); |
| 718 | |
| 719 | of_node_put(cpus); |
| 720 | return rc; |
| 721 | } |
| 722 | |
Benjamin Herrenschmidt | 4350147 | 2005-11-07 14:27:33 +1100 | [diff] [blame] | 723 | module_init(g5_cpufreq_init); |
| 724 | |
| 725 | |
| 726 | MODULE_LICENSE("GPL"); |