Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2007 PA Semi, Inc |
| 3 | * |
| 4 | * Authors: Egor Martovetsky <egor@pasemi.com> |
| 5 | * Olof Johansson <olof@lixom.net> |
| 6 | * |
| 7 | * Maintained by: Olof Johansson <olof@lixom.net> |
| 8 | * |
| 9 | * Based on arch/powerpc/platforms/cell/cbe_cpufreq.c: |
| 10 | * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 |
| 11 | * |
| 12 | * This program is free software; you can redistribute it and/or modify |
| 13 | * it under the terms of the GNU General Public License as published by |
| 14 | * the Free Software Foundation; either version 2, or (at your option) |
| 15 | * any later version. |
| 16 | * |
| 17 | * This program is distributed in the hope that it will be useful, |
| 18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 20 | * GNU General Public License for more details. |
| 21 | * |
| 22 | * You should have received a copy of the GNU General Public License |
| 23 | * along with this program; if not, write to the Free Software |
| 24 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 25 | * |
| 26 | */ |
| 27 | |
| 28 | #include <linux/cpufreq.h> |
| 29 | #include <linux/timer.h> |
Paul Gortmaker | 7dfe293 | 2011-05-27 13:23:32 -0400 | [diff] [blame] | 30 | #include <linux/module.h> |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 31 | |
| 32 | #include <asm/hw_irq.h> |
| 33 | #include <asm/io.h> |
| 34 | #include <asm/prom.h> |
Olof Johansson | 2abb701 | 2007-05-04 14:39:21 +1000 | [diff] [blame] | 35 | #include <asm/time.h> |
Olof Johansson | 8b32bc0 | 2007-11-07 09:26:06 -0600 | [diff] [blame] | 36 | #include <asm/smp.h> |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 37 | |
| 38 | #define SDCASR_REG 0x0100 |
| 39 | #define SDCASR_REG_STRIDE 0x1000 |
| 40 | #define SDCPWR_CFGA0_REG 0x0100 |
| 41 | #define SDCPWR_PWST0_REG 0x0000 |
| 42 | #define SDCPWR_GIZTIME_REG 0x0440 |
| 43 | |
| 44 | /* SDCPWR_GIZTIME_REG fields */ |
| 45 | #define SDCPWR_GIZTIME_GR 0x80000000 |
| 46 | #define SDCPWR_GIZTIME_LONGLOCK 0x000000ff |
| 47 | |
| 48 | /* Offset of ASR registers from SDC base */ |
| 49 | #define SDCASR_OFFSET 0x120000 |
| 50 | |
| 51 | static void __iomem *sdcpwr_mapbase; |
| 52 | static void __iomem *sdcasr_mapbase; |
| 53 | |
| 54 | static DEFINE_MUTEX(pas_switch_mutex); |
| 55 | |
| 56 | /* Current astate, is used when waking up from power savings on |
| 57 | * one core, in case the other core has switched states during |
| 58 | * the idle time. |
| 59 | */ |
| 60 | static int current_astate; |
| 61 | |
| 62 | /* We support 5(A0-A4) power states excluding turbo(A5-A6) modes */ |
| 63 | static struct cpufreq_frequency_table pas_freqs[] = { |
| 64 | {0, 0}, |
| 65 | {1, 0}, |
| 66 | {2, 0}, |
| 67 | {3, 0}, |
| 68 | {4, 0}, |
| 69 | {0, CPUFREQ_TABLE_END}, |
| 70 | }; |
| 71 | |
| 72 | static struct freq_attr *pas_cpu_freqs_attr[] = { |
| 73 | &cpufreq_freq_attr_scaling_available_freqs, |
| 74 | NULL, |
| 75 | }; |
| 76 | |
| 77 | /* |
| 78 | * hardware specific functions |
| 79 | */ |
| 80 | |
| 81 | static int get_astate_freq(int astate) |
| 82 | { |
| 83 | u32 ret; |
| 84 | ret = in_le32(sdcpwr_mapbase + SDCPWR_CFGA0_REG + (astate * 0x10)); |
| 85 | |
| 86 | return ret & 0x3f; |
| 87 | } |
| 88 | |
| 89 | static int get_cur_astate(int cpu) |
| 90 | { |
| 91 | u32 ret; |
| 92 | |
| 93 | ret = in_le32(sdcpwr_mapbase + SDCPWR_PWST0_REG); |
| 94 | ret = (ret >> (cpu * 4)) & 0x7; |
| 95 | |
| 96 | return ret; |
| 97 | } |
| 98 | |
| 99 | static int get_gizmo_latency(void) |
| 100 | { |
| 101 | u32 giztime, ret; |
| 102 | |
| 103 | giztime = in_le32(sdcpwr_mapbase + SDCPWR_GIZTIME_REG); |
| 104 | |
| 105 | /* just provide the upper bound */ |
| 106 | if (giztime & SDCPWR_GIZTIME_GR) |
| 107 | ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 128000; |
| 108 | else |
| 109 | ret = (giztime & SDCPWR_GIZTIME_LONGLOCK) * 1000; |
| 110 | |
| 111 | return ret; |
| 112 | } |
| 113 | |
| 114 | static void set_astate(int cpu, unsigned int astate) |
| 115 | { |
Ingo Molnar | ac3f645 | 2009-01-06 14:06:28 +0000 | [diff] [blame] | 116 | unsigned long flags; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 117 | |
| 118 | /* Return if called before init has run */ |
| 119 | if (unlikely(!sdcasr_mapbase)) |
| 120 | return; |
| 121 | |
| 122 | local_irq_save(flags); |
| 123 | |
| 124 | out_le32(sdcasr_mapbase + SDCASR_REG + SDCASR_REG_STRIDE*cpu, astate); |
| 125 | |
| 126 | local_irq_restore(flags); |
| 127 | } |
| 128 | |
Olof Johansson | 8b32bc0 | 2007-11-07 09:26:06 -0600 | [diff] [blame] | 129 | int check_astate(void) |
| 130 | { |
| 131 | return get_cur_astate(hard_smp_processor_id()); |
| 132 | } |
| 133 | |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 134 | void restore_astate(int cpu) |
| 135 | { |
| 136 | set_astate(cpu, current_astate); |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * cpufreq functions |
| 141 | */ |
| 142 | |
| 143 | static int pas_cpufreq_cpu_init(struct cpufreq_policy *policy) |
| 144 | { |
Stephen Rothwell | 12d371a | 2007-04-29 16:29:08 +1000 | [diff] [blame] | 145 | const u32 *max_freqp; |
| 146 | u32 max_freq; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 147 | int i, cur_astate; |
| 148 | struct resource res; |
| 149 | struct device_node *cpu, *dn; |
| 150 | int err = -ENODEV; |
| 151 | |
| 152 | cpu = of_get_cpu_node(policy->cpu, NULL); |
| 153 | |
| 154 | if (!cpu) |
| 155 | goto out; |
| 156 | |
Olof Johansson | 0d08a84 | 2007-11-04 20:57:45 -0600 | [diff] [blame] | 157 | dn = of_find_compatible_node(NULL, NULL, "1682m-sdc"); |
| 158 | if (!dn) |
| 159 | dn = of_find_compatible_node(NULL, NULL, |
| 160 | "pasemi,pwrficient-sdc"); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 161 | if (!dn) |
| 162 | goto out; |
| 163 | err = of_address_to_resource(dn, 0, &res); |
| 164 | of_node_put(dn); |
| 165 | if (err) |
| 166 | goto out; |
| 167 | sdcasr_mapbase = ioremap(res.start + SDCASR_OFFSET, 0x2000); |
| 168 | if (!sdcasr_mapbase) { |
| 169 | err = -EINVAL; |
| 170 | goto out; |
| 171 | } |
| 172 | |
Olof Johansson | 0d08a84 | 2007-11-04 20:57:45 -0600 | [diff] [blame] | 173 | dn = of_find_compatible_node(NULL, NULL, "1682m-gizmo"); |
| 174 | if (!dn) |
| 175 | dn = of_find_compatible_node(NULL, NULL, |
| 176 | "pasemi,pwrficient-gizmo"); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 177 | if (!dn) { |
| 178 | err = -ENODEV; |
| 179 | goto out_unmap_sdcasr; |
| 180 | } |
| 181 | err = of_address_to_resource(dn, 0, &res); |
| 182 | of_node_put(dn); |
| 183 | if (err) |
| 184 | goto out_unmap_sdcasr; |
| 185 | sdcpwr_mapbase = ioremap(res.start, 0x1000); |
| 186 | if (!sdcpwr_mapbase) { |
| 187 | err = -EINVAL; |
| 188 | goto out_unmap_sdcasr; |
| 189 | } |
| 190 | |
| 191 | pr_debug("init cpufreq on CPU %d\n", policy->cpu); |
| 192 | |
Stephen Rothwell | 12d371a | 2007-04-29 16:29:08 +1000 | [diff] [blame] | 193 | max_freqp = of_get_property(cpu, "clock-frequency", NULL); |
| 194 | if (!max_freqp) { |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 195 | err = -EINVAL; |
| 196 | goto out_unmap_sdcpwr; |
| 197 | } |
| 198 | |
| 199 | /* we need the freq in kHz */ |
Stephen Rothwell | 12d371a | 2007-04-29 16:29:08 +1000 | [diff] [blame] | 200 | max_freq = *max_freqp / 1000; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 201 | |
Stephen Rothwell | 12d371a | 2007-04-29 16:29:08 +1000 | [diff] [blame] | 202 | pr_debug("max clock-frequency is at %u kHz\n", max_freq); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 203 | pr_debug("initializing frequency table\n"); |
| 204 | |
| 205 | /* initialize frequency table */ |
| 206 | for (i=0; pas_freqs[i].frequency!=CPUFREQ_TABLE_END; i++) { |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 207 | pas_freqs[i].frequency = |
| 208 | get_astate_freq(pas_freqs[i].driver_data) * 100000; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 209 | pr_debug("%d: %d\n", i, pas_freqs[i].frequency); |
| 210 | } |
| 211 | |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 212 | policy->cpuinfo.transition_latency = get_gizmo_latency(); |
| 213 | |
| 214 | cur_astate = get_cur_astate(policy->cpu); |
| 215 | pr_debug("current astate is at %d\n",cur_astate); |
| 216 | |
| 217 | policy->cur = pas_freqs[cur_astate].frequency; |
Anton Blanchard | 1b095cf | 2010-04-26 15:32:32 +0000 | [diff] [blame] | 218 | cpumask_copy(policy->cpus, cpu_online_mask); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 219 | |
Olof Johansson | 2abb701 | 2007-05-04 14:39:21 +1000 | [diff] [blame] | 220 | ppc_proc_freq = policy->cur * 1000ul; |
| 221 | |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 222 | cpufreq_frequency_table_get_attr(pas_freqs, policy->cpu); |
| 223 | |
| 224 | /* this ensures that policy->cpuinfo_min and policy->cpuinfo_max |
| 225 | * are set correctly |
| 226 | */ |
| 227 | return cpufreq_frequency_table_cpuinfo(policy, pas_freqs); |
| 228 | |
| 229 | out_unmap_sdcpwr: |
| 230 | iounmap(sdcpwr_mapbase); |
| 231 | |
| 232 | out_unmap_sdcasr: |
| 233 | iounmap(sdcasr_mapbase); |
| 234 | out: |
| 235 | return err; |
| 236 | } |
| 237 | |
| 238 | static int pas_cpufreq_cpu_exit(struct cpufreq_policy *policy) |
| 239 | { |
Steven Rostedt | 72640d8 | 2013-01-21 17:23:26 +0000 | [diff] [blame] | 240 | /* |
| 241 | * We don't support CPU hotplug. Don't unmap after the system |
| 242 | * has already made it to a running state. |
| 243 | */ |
| 244 | if (system_state != SYSTEM_BOOTING) |
| 245 | return 0; |
| 246 | |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 247 | if (sdcasr_mapbase) |
| 248 | iounmap(sdcasr_mapbase); |
| 249 | if (sdcpwr_mapbase) |
| 250 | iounmap(sdcpwr_mapbase); |
| 251 | |
| 252 | cpufreq_frequency_table_put_attr(policy->cpu); |
| 253 | return 0; |
| 254 | } |
| 255 | |
| 256 | static int pas_cpufreq_verify(struct cpufreq_policy *policy) |
| 257 | { |
| 258 | return cpufreq_frequency_table_verify(policy, pas_freqs); |
| 259 | } |
| 260 | |
| 261 | static int pas_cpufreq_target(struct cpufreq_policy *policy, |
| 262 | unsigned int target_freq, |
| 263 | unsigned int relation) |
| 264 | { |
| 265 | struct cpufreq_freqs freqs; |
| 266 | int pas_astate_new; |
| 267 | int i; |
| 268 | |
| 269 | cpufreq_frequency_table_target(policy, |
| 270 | pas_freqs, |
| 271 | target_freq, |
| 272 | relation, |
| 273 | &pas_astate_new); |
| 274 | |
| 275 | freqs.old = policy->cur; |
| 276 | freqs.new = pas_freqs[pas_astate_new].frequency; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 277 | |
| 278 | mutex_lock(&pas_switch_mutex); |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 279 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 280 | |
| 281 | pr_debug("setting frequency for cpu %d to %d kHz, 1/%d of max frequency\n", |
| 282 | policy->cpu, |
| 283 | pas_freqs[pas_astate_new].frequency, |
Viresh Kumar | 5070158 | 2013-03-30 16:25:15 +0530 | [diff] [blame] | 284 | pas_freqs[pas_astate_new].driver_data); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 285 | |
| 286 | current_astate = pas_astate_new; |
| 287 | |
| 288 | for_each_online_cpu(i) |
| 289 | set_astate(i, pas_astate_new); |
| 290 | |
Viresh Kumar | b43a7ff | 2013-03-24 11:56:43 +0530 | [diff] [blame] | 291 | cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE); |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 292 | mutex_unlock(&pas_switch_mutex); |
| 293 | |
Olof Johansson | 2abb701 | 2007-05-04 14:39:21 +1000 | [diff] [blame] | 294 | ppc_proc_freq = freqs.new * 1000ul; |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 295 | return 0; |
| 296 | } |
| 297 | |
| 298 | static struct cpufreq_driver pas_cpufreq_driver = { |
| 299 | .name = "pas-cpufreq", |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 300 | .flags = CPUFREQ_CONST_LOOPS, |
| 301 | .init = pas_cpufreq_cpu_init, |
| 302 | .exit = pas_cpufreq_cpu_exit, |
| 303 | .verify = pas_cpufreq_verify, |
| 304 | .target = pas_cpufreq_target, |
| 305 | .attr = pas_cpu_freqs_attr, |
| 306 | }; |
| 307 | |
| 308 | /* |
| 309 | * module init and destoy |
| 310 | */ |
| 311 | |
| 312 | static int __init pas_cpufreq_init(void) |
| 313 | { |
Grant Likely | 71a157e | 2010-02-01 21:34:14 -0700 | [diff] [blame] | 314 | if (!of_machine_is_compatible("PA6T-1682M") && |
| 315 | !of_machine_is_compatible("pasemi,pwrficient")) |
Olof Johansson | 2e0c337 | 2007-04-27 15:46:01 +1000 | [diff] [blame] | 316 | return -ENODEV; |
| 317 | |
| 318 | return cpufreq_register_driver(&pas_cpufreq_driver); |
| 319 | } |
| 320 | |
| 321 | static void __exit pas_cpufreq_exit(void) |
| 322 | { |
| 323 | cpufreq_unregister_driver(&pas_cpufreq_driver); |
| 324 | } |
| 325 | |
| 326 | module_init(pas_cpufreq_init); |
| 327 | module_exit(pas_cpufreq_exit); |
| 328 | |
| 329 | MODULE_LICENSE("GPL"); |
| 330 | MODULE_AUTHOR("Egor Martovetsky <egor@pasemi.com>, Olof Johansson <olof@lixom.net>"); |