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(struct ctl_table *ctl, int write,
 154                                 void __user *buffer, size_t *lenp, loff_t *fpos)
 155 {
 156         int mode;
 157
 158         if (*lenp <= 0)
 159                 return -EIO;
 160
 161         mode = user_atoi(buffer, *lenp);
 162         switch (mode) {
 163         case 1:
 164             return pm_do_suspend();
 165
 166         case 5:
 167             return pm_do_bus_sleep();
 168
 169         default:
 170             return -EINVAL;
 171         }
 172 }
 173
 174 static int try_set_cmode(int new_cmode)
 175 {
 176         if (new_cmode > 15)
 177                 return -EINVAL;
 178         if (!(clock_cmodes_permitted & (1<<new_cmode)))
 179                 return -EINVAL;
 180
 181         /* now change cmode */
 182         local_irq_disable();
 183         frv_dma_pause_all();
 184
 185         frv_change_cmode(new_cmode);
 186
 187         determine_clocks(0);
 188         time_divisor_init();
 189
 190 #ifdef DEBUG
 191         determine_clocks(1);
 192 #endif
 193         frv_dma_resume_all();
 194         local_irq_enable();
 195
 196         return 0;
 197 }
 198
 199
 200 static int cmode_procctl(struct ctl_table *ctl, int write,
 201                          void __user *buffer, size_t *lenp, loff_t *fpos)
 202 {
 203         int new_cmode;
 204
 205         if (!write)
 206                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 207
 208         new_cmode = user_atoi(buffer, *lenp);
 209
 210         return try_set_cmode(new_cmode)?:*lenp;
 211 }
 212
 213 static int try_set_p0(int new_p0)
 214 {
 215         unsigned long flags, clkc;
 216
 217         if (new_p0 < 0 || new_p0 > 1)
 218                 return -EINVAL;
 219
 220         local_irq_save(flags);
 221         __set_PSR(flags & ~PSR_ET);
 222
 223         frv_dma_pause_all();
 224
 225         clkc = __get_CLKC();
 226         if (new_p0)
 227                 clkc |= CLKC_P0;
 228         else
 229                 clkc &= ~CLKC_P0;
 230         __set_CLKC(clkc);
 231
 232         determine_clocks(0);
 233         time_divisor_init();
 234
 235 #ifdef DEBUG
 236         determine_clocks(1);
 237 #endif
 238         frv_dma_resume_all();
 239         local_irq_restore(flags);
 240         return 0;
 241 }
 242
 243 static int try_set_cm(int new_cm)
 244 {
 245         unsigned long flags, clkc;
 246
 247         if (new_cm < 0 || new_cm > 1)
 248                 return -EINVAL;
 249
 250         local_irq_save(flags);
 251         __set_PSR(flags & ~PSR_ET);
 252
 253         frv_dma_pause_all();
 254
 255         clkc = __get_CLKC();
 256         clkc &= ~CLKC_CM;
 257         clkc |= new_cm;
 258         __set_CLKC(clkc);
 259
 260         determine_clocks(0);
 261         time_divisor_init();
 262
 263 #if 1 //def DEBUG
 264         determine_clocks(1);
 265 #endif
 266
 267         frv_dma_resume_all();
 268         local_irq_restore(flags);
 269         return 0;
 270 }
 271
 272 static int p0_procctl(struct ctl_table *ctl, int write,
 273                       void __user *buffer, size_t *lenp, loff_t *fpos)
 274 {
 275         int new_p0;
 276
 277         if (!write)
 278                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 279
 280         new_p0 = user_atoi(buffer, *lenp);
 281
 282         return try_set_p0(new_p0)?:*lenp;
 283 }
 284
 285 static int cm_procctl(struct ctl_table *ctl, int write,
 286                       void __user *buffer, size_t *lenp, loff_t *fpos)
 287 {
 288         int new_cm;
 289
 290         if (!write)
 291                 return proc_dointvec(ctl, write, buffer, lenp, fpos);
 292
 293         new_cm = user_atoi(buffer, *lenp);
 294
 295         return try_set_cm(new_cm)?:*lenp;
 296 }
 297
 298 static struct ctl_table pm_table[] =
 299 {
 300         {
 301                 .procname       = "suspend",
 302                 .data           = NULL,
 303                 .maxlen         = 0,
 304                 .mode           = 0200,
 305                 .proc_handler   = sysctl_pm_do_suspend,
 306         },
 307         {
 308                 .procname       = "cmode",
 309                 .data           = &clock_cmode_current,
 310                 .maxlen         = sizeof(int),
 311                 .mode           = 0644,
 312                 .proc_handler   = cmode_procctl,
 313         },
 314         {
 315                 .procname       = "p0",
 316                 .data           = &clock_p0_current,
 317                 .maxlen         = sizeof(int),
 318                 .mode           = 0644,
 319                 .proc_handler   = p0_procctl,
 320         },
 321         {
 322                 .procname       = "cm",
 323                 .data           = &clock_cm_current,
 324                 .maxlen         = sizeof(int),
 325                 .mode           = 0644,
 326                 .proc_handler   = cm_procctl,
 327         },
 328         { }
 329 };
 330
 331 static struct ctl_table pm_dir_table[] =
 332 {
 333         {
 334                 .procname       = "pm",
 335                 .mode           = 0555,
 336                 .child          = pm_table,
 337         },
 338         { }
 339 };
 340
 341 /*
 342  * Initialize power interface
 343  */
 344 static int __init pm_init(void)
 345 {
 346         register_sysctl_table(pm_dir_table);
 347         return 0;
 348 }
 349
 350 __initcall(pm_init);
 351
 352 #endif