arch/frv/kernel/pm.c

   1 /*
   2  * FR-V Power Management Routines
   3  *
   4  * Copyright (c) 2004 Red Hat, Inc.
   5  *
   6  * Based on SA1100 version:
   7  * Copyright (c) 2001 Cliff Brake <cbrake@accelent.com>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License.
  11  *
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/module.h>
  16 #include <linux/pm.h>
  17 #include <linux/sched.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/sysctl.h>
  20 #include <linux/errno.h>
  21 #include <linux/delay.h>
  22 #include <asm/uaccess.h>
  23
  24 #include <asm/mb86943a.h>
  25
  26 #include "local.h"
  27
  28 /*
  29  * Debug macros
  30  */
  31 #define DEBUG
  32
  33 int pm_do_suspend(void)
  34 {
  35         local_irq_disable();
  36
  37         __set_LEDS(0xb1);
  38
  39         /* go zzz */
  40         frv_cpu_suspend(pdm_suspend_mode);
  41
  42         __set_LEDS(0xb2);
  43
  44         local_irq_enable();
  45
  46         return 0;
  47 }
  48
  49 static unsigned long __irq_mask;
  50
  51 /*
  52  * Setup interrupt masks, etc to enable wakeup by power switch
  53  */
  54 static void __default_power_switch_setup(void)
  55 {
  56         /* default is to mask all interrupt sources. */
  57         __irq_mask = *(unsigned long *)0xfeff9820;
  58         *(unsigned long *)0xfeff9820 = 0xfffe0000;
  59 }
  60
  61 /*
  62  * Cleanup interrupt masks, etc after wakeup by power switch
  63  */
  64 static void __default_power_switch_cleanup(void)
  65 {
  66         *(unsigned long *)0xfeff9820 = __irq_mask;
  67 }
  68
  69 /*
  70  * Return non-zero if wakeup irq was caused by power switch
  71  */
  72 static int __default_power_switch_check(void)
  73 {
  74         return 1;
  75 }
  76
  77 void (*__power_switch_wake_setup)(void) = __default_power_switch_setup;
  78 int  (*__power_switch_wake_check)(void) = __default_power_switch_check;
  79 void (*__power_switch_wake_cleanup)(void) = __default_power_switch_cleanup;
  80
  81 int pm_do_bus_sleep(void)
  82 {
  83         local_irq_disable();
  84
  85         /*
  86          * Here is where we need some platform-dependent setup
  87          * of the interrupt state so that appropriate wakeup
  88          * sources are allowed and all others are masked.
  89          */
  90         __power_switch_wake_setup();
  91
  92         __set_LEDS(0xa1);
  93
  94         /* go zzz
  95          *
  96          * This is in a loop in case power switch shares an irq with other
  97          * devices. The wake_check() tells us if we need to finish waking
  98          * or go back to sleep.
  99          */
 100         do {
 101                 frv_cpu_suspend(HSR0_PDM_BUS_SLEEP);
 102         } while (__power_switch_wake_check && !__power_switch_wake_check());
 103
 104         __set_LEDS(0xa2);
 105
 106         /*
 107          * Here is where we need some platform-dependent restore
 108          * of the interrupt state prior to being called.
 109          */
 110         __power_switch_wake_cleanup();
 111
 112         local_irq_enable();
 113
 114         return 0;
 115 }
 116
 117 unsigned long sleep_phys_sp(void *sp)
 118 {
 119         return virt_to_phys(sp);
 120 }
 121
 122 #ifdef CONFIG_SYSCTL
 123 /*
 124  * Use a temporary sysctl number. Horrid, but will be cleaned up in 2.6
 125  * when all the PM interfaces exist nicely.
 126  */
 127 #define CTL_PM_SUSPEND 1
 128 #define CTL_PM_CMODE 2
 129 #define CTL_PM_P0 4
 130 #define CTL_PM_CM 5
 131
 132 static int user_atoi(char __user *ubuf, size_t len)
 133 {
 134         char buf[16];
 135         unsigned long ret;
 136
 137         if (len > 15)
 138                 return -EINVAL;
 139
 140         if (copy_from_user(buf, ubuf, len))
 141                 return -EFAULT;
 142
 143         buf[len] = 0;
 144         ret = simple_strtoul(buf, NULL, 0);
 145         if (ret > INT_MAX)
 146                 return -ERANGE;
 147         return ret;
 148 }
 149
 150 /*
 151  * Send us to sleep.
 152  */
 153 static int sysctl_pm_do_suspend(ctl_table *ctl, int write,
 154                                 void __user *buffer, size_t *lenp, loff_t *fpos)
 155 {
 156         int retval, mode;
 157
 158         if (*lenp <= 0)
 159                 return -EIO;
 160
 161         mode = user_atoi(buffer, *lenp);
 162         if ((mode != 1) && (mode != 5))
 163                 return -EINVAL;
 164
 165         if (retval == 0) {
 166                 if (mode == 5)
 167                     retval = pm_do_bus_sleep();
 168                 else
 169                     retval = pm_do_suspend();
 170         }
 171
 172         return retval;
 173 }
 174
 175 static int try_set_cmode(int new_cmode)
 176 {
 177         if (new_cmode > 15)
 178                 return -EINVAL;
 179         if (!(clock_cmodes_permitted & (1<<new_cmode)))
 180                 return -EINVAL;
 181
 182         /* now change cmode */
 183         local_irq_disable();
 184         frv_dma_pause_all();
 185
 186         frv_change_cmode(new_cmode);
 187
 188         determine_clocks(0);
 189         time_divisor_init();
 190
 191 #ifdef DEBUG
 192         determine_clocks(1);
 193 #endif
 194         frv_dma_resume_all();
 195         local_irq_enable();
 196
 197         return 0;
 198 }
 199
 200
 201 static int cmode_procctl(ctl_table *ctl, int write,
 202                          void __user *buffer, size_t *lenp, loff_t *fpos)
 203 {
 204         int new_cmode;
 205
 206         if (!write)
 207                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 208
 209         new_cmode = user_atoi(buffer, *lenp);
 210
 211         return try_set_cmode(new_cmode)?:*lenp;
 212 }
 213
 214 static int try_set_p0(int new_p0)
 215 {
 216         unsigned long flags, clkc;
 217
 218         if (new_p0 < 0 || new_p0 > 1)
 219                 return -EINVAL;
 220
 221         local_irq_save(flags);
 222         __set_PSR(flags & ~PSR_ET);
 223
 224         frv_dma_pause_all();
 225
 226         clkc = __get_CLKC();
 227         if (new_p0)
 228                 clkc |= CLKC_P0;
 229         else
 230                 clkc &= ~CLKC_P0;
 231         __set_CLKC(clkc);
 232
 233         determine_clocks(0);
 234         time_divisor_init();
 235
 236 #ifdef DEBUG
 237         determine_clocks(1);
 238 #endif
 239         frv_dma_resume_all();
 240         local_irq_restore(flags);
 241         return 0;
 242 }
 243
 244 static int try_set_cm(int new_cm)
 245 {
 246         unsigned long flags, clkc;
 247
 248         if (new_cm < 0 || new_cm > 1)
 249                 return -EINVAL;
 250
 251         local_irq_save(flags);
 252         __set_PSR(flags & ~PSR_ET);
 253
 254         frv_dma_pause_all();
 255
 256         clkc = __get_CLKC();
 257         clkc &= ~CLKC_CM;
 258         clkc |= new_cm;
 259         __set_CLKC(clkc);
 260
 261         determine_clocks(0);
 262         time_divisor_init();
 263
 264 #if 1 //def DEBUG
 265         determine_clocks(1);
 266 #endif
 267
 268         frv_dma_resume_all();
 269         local_irq_restore(flags);
 270         return 0;
 271 }
 272
 273 static int p0_procctl(ctl_table *ctl, int write,
 274                       void __user *buffer, size_t *lenp, loff_t *fpos)
 275 {
 276         int new_p0;
 277
 278         if (!write)
 279                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 280
 281         new_p0 = user_atoi(buffer, *lenp);
 282
 283         return try_set_p0(new_p0)?:*lenp;
 284 }
 285
 286 static int cm_procctl(ctl_table *ctl, int write,
 287                       void __user *buffer, size_t *lenp, loff_t *fpos)
 288 {
 289         int new_cm;
 290
 291         if (!write)
 292                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 293
 294         new_cm = user_atoi(buffer, *lenp);
 295
 296         return try_set_cm(new_cm)?:*lenp;
 297 }
 298
 299 static struct ctl_table pm_table[] =
 300 {
 301         {
 302                 .procname       = "suspend",
 303                 .data           = NULL,
 304                 .maxlen         = 0,
 305                 .mode           = 0200,
 306                 .proc_handler   = sysctl_pm_do_suspend,
 307         },
 308         {
 309                 .procname       = "cmode",
 310                 .data           = &clock_cmode_current,
 311                 .maxlen         = sizeof(int),
 312                 .mode           = 0644,
 313                 .proc_handler   = cmode_procctl,
 314         },
 315         {
 316                 .procname       = "p0",
 317                 .data           = &clock_p0_current,
 318                 .maxlen         = sizeof(int),
 319                 .mode           = 0644,
 320                 .proc_handler   = p0_procctl,
 321         },
 322         {
 323                 .procname       = "cm",
 324                 .data           = &clock_cm_current,
 325                 .maxlen         = sizeof(int),
 326                 .mode           = 0644,
 327                 .proc_handler   = cm_procctl,
 328         },
 329         { }
 330 };
 331
 332 static struct ctl_table pm_dir_table[] =
 333 {
 334         {
 335                 .procname       = "pm",
 336                 .mode           = 0555,
 337                 .child          = pm_table,
 338         },
 339         { }
 340 };
 341
 342 /*
 343  * Initialize power interface
 344  */
 345 static int __init pm_init(void)
 346 {
 347         register_sysctl_table(pm_dir_table);
 348         return 0;
 349 }
 350
 351 __initcall(pm_init);
 352
 353 #endif