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   1 /*
   2  * linux/arch/arm/mach-omap2/pm.c
   3  *
   4  * OMAP2 Power Management Routines
   5  *
   6  * Copyright (C) 2006 Nokia Corporation
   7  * Tony Lindgren <tony@atomide.com>
   8  *
   9  * Copyright (C) 2005 Texas Instruments, Inc.
  10  * Richard Woodruff <r-woodruff2@ti.com>
  11  *
  12  * Based on pm.c for omap1
  13  *
  14  * This program is free software; you can redistribute it and/or modify
  15  * it under the terms of the GNU General Public License version 2 as
  16  * published by the Free Software Foundation.
  17  */
  18
  19 #include <linux/pm.h>
  20 #include <linux/sched.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/pm.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/sysfs.h>
  25 #include <linux/module.h>
  26 #include <linux/delay.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/irq.h>
  30 #include <asm/atomic.h>
  31 #include <asm/mach/time.h>
  32 #include <asm/mach/irq.h>
  33 #include <asm/mach-types.h>
  34
  35 #include <asm/arch/irqs.h>
  36 #include <asm/arch/clock.h>
  37 #include <asm/arch/sram.h>
  38 #include <asm/arch/pm.h>
  39
  40 #include "prcm-regs.h"
  41
  42 static struct clk *vclk;
  43 static void (*omap2_sram_idle)(void);
  44 static void (*omap2_sram_suspend)(int dllctrl, int cpu_rev);
  45 static void (*saved_idle)(void);
  46
  47 extern void __init pmdomain_init(void);
  48 extern void pmdomain_set_autoidle(void);
  49
  50 static unsigned int omap24xx_sleep_save[OMAP24XX_SLEEP_SAVE_SIZE];
  51
  52 void omap2_pm_idle(void)
  53 {
  54         local_irq_disable();
  55         local_fiq_disable();
  56         if (need_resched()) {
  57                 local_fiq_enable();
  58                 local_irq_enable();
  59                 return;
  60         }
  61
  62         /*
  63          * Since an interrupt may set up a timer, we don't want to
  64          * reprogram the hardware timer with interrupts enabled.
  65          * Re-enable interrupts only after returning from idle.
  66          */
  67         timer_dyn_reprogram();
  68
  69         omap2_sram_idle();
  70         local_fiq_enable();
  71         local_irq_enable();
  72 }
  73
  74 static int omap2_pm_prepare(suspend_state_t state)
  75 {
  76         int error = 0;
  77
  78         /* We cannot sleep in idle until we have resumed */
  79         saved_idle = pm_idle;
  80         pm_idle = NULL;
  81
  82         switch (state)
  83         {
  84         case PM_SUSPEND_STANDBY:
  85         case PM_SUSPEND_MEM:
  86                 break;
  87
  88         case PM_SUSPEND_DISK:
  89                 return -ENOTSUPP;
  90
  91         default:
  92                 return -EINVAL;
  93         }
  94
  95         return error;
  96 }
  97
  98 #define INT0_WAKE_MASK  (OMAP_IRQ_BIT(INT_24XX_GPIO_BANK1) |    \
  99                         OMAP_IRQ_BIT(INT_24XX_GPIO_BANK2) |     \
 100                         OMAP_IRQ_BIT(INT_24XX_GPIO_BANK3))
 101
 102 #define INT1_WAKE_MASK  (OMAP_IRQ_BIT(INT_24XX_GPIO_BANK4))
 103
 104 #define INT2_WAKE_MASK  (OMAP_IRQ_BIT(INT_24XX_UART1_IRQ) |     \
 105                         OMAP_IRQ_BIT(INT_24XX_UART2_IRQ) |      \
 106                         OMAP_IRQ_BIT(INT_24XX_UART3_IRQ))
 107
 108 #define preg(reg)       printk("%s\t(0x%p):\t0x%08x\n", #reg, &reg, reg);
 109
 110 static void omap2_pm_debug(char * desc)
 111 {
 112         printk("%s:\n", desc);
 113
 114         preg(CM_CLKSTCTRL_MPU);
 115         preg(CM_CLKSTCTRL_CORE);
 116         preg(CM_CLKSTCTRL_GFX);
 117         preg(CM_CLKSTCTRL_DSP);
 118         preg(CM_CLKSTCTRL_MDM);
 119
 120         preg(PM_PWSTCTRL_MPU);
 121         preg(PM_PWSTCTRL_CORE);
 122         preg(PM_PWSTCTRL_GFX);
 123         preg(PM_PWSTCTRL_DSP);
 124         preg(PM_PWSTCTRL_MDM);
 125
 126         preg(PM_PWSTST_MPU);
 127         preg(PM_PWSTST_CORE);
 128         preg(PM_PWSTST_GFX);
 129         preg(PM_PWSTST_DSP);
 130         preg(PM_PWSTST_MDM);
 131
 132         preg(CM_AUTOIDLE1_CORE);
 133         preg(CM_AUTOIDLE2_CORE);
 134         preg(CM_AUTOIDLE3_CORE);
 135         preg(CM_AUTOIDLE4_CORE);
 136         preg(CM_AUTOIDLE_WKUP);
 137         preg(CM_AUTOIDLE_PLL);
 138         preg(CM_AUTOIDLE_DSP);
 139         preg(CM_AUTOIDLE_MDM);
 140
 141         preg(CM_ICLKEN1_CORE);
 142         preg(CM_ICLKEN2_CORE);
 143         preg(CM_ICLKEN3_CORE);
 144         preg(CM_ICLKEN4_CORE);
 145         preg(CM_ICLKEN_GFX);
 146         preg(CM_ICLKEN_WKUP);
 147         preg(CM_ICLKEN_DSP);
 148         preg(CM_ICLKEN_MDM);
 149
 150         preg(CM_IDLEST1_CORE);
 151         preg(CM_IDLEST2_CORE);
 152         preg(CM_IDLEST3_CORE);
 153         preg(CM_IDLEST4_CORE);
 154         preg(CM_IDLEST_GFX);
 155         preg(CM_IDLEST_WKUP);
 156         preg(CM_IDLEST_CKGEN);
 157         preg(CM_IDLEST_DSP);
 158         preg(CM_IDLEST_MDM);
 159
 160         preg(RM_RSTST_MPU);
 161         preg(RM_RSTST_GFX);
 162         preg(RM_RSTST_WKUP);
 163         preg(RM_RSTST_DSP);
 164         preg(RM_RSTST_MDM);
 165
 166         preg(PM_WKDEP_MPU);
 167         preg(PM_WKDEP_CORE);
 168         preg(PM_WKDEP_GFX);
 169         preg(PM_WKDEP_DSP);
 170         preg(PM_WKDEP_MDM);
 171
 172         preg(CM_FCLKEN_WKUP);
 173         preg(CM_ICLKEN_WKUP);
 174         preg(CM_IDLEST_WKUP);
 175         preg(CM_AUTOIDLE_WKUP);
 176         preg(CM_CLKSEL_WKUP);
 177
 178         preg(PM_WKEN_WKUP);
 179         preg(PM_WKST_WKUP);
 180 }
 181
 182 static inline void omap2_pm_save_registers(void)
 183 {
 184         /* Save interrupt registers */
 185         OMAP24XX_SAVE(INTC_MIR0);
 186         OMAP24XX_SAVE(INTC_MIR1);
 187         OMAP24XX_SAVE(INTC_MIR2);
 188
 189         /* Save power control registers */
 190         OMAP24XX_SAVE(CM_CLKSTCTRL_MPU);
 191         OMAP24XX_SAVE(CM_CLKSTCTRL_CORE);
 192         OMAP24XX_SAVE(CM_CLKSTCTRL_GFX);
 193         OMAP24XX_SAVE(CM_CLKSTCTRL_DSP);
 194         OMAP24XX_SAVE(CM_CLKSTCTRL_MDM);
 195
 196         /* Save power state registers */
 197         OMAP24XX_SAVE(PM_PWSTCTRL_MPU);
 198         OMAP24XX_SAVE(PM_PWSTCTRL_CORE);
 199         OMAP24XX_SAVE(PM_PWSTCTRL_GFX);
 200         OMAP24XX_SAVE(PM_PWSTCTRL_DSP);
 201         OMAP24XX_SAVE(PM_PWSTCTRL_MDM);
 202
 203         /* Save autoidle registers */
 204         OMAP24XX_SAVE(CM_AUTOIDLE1_CORE);
 205         OMAP24XX_SAVE(CM_AUTOIDLE2_CORE);
 206         OMAP24XX_SAVE(CM_AUTOIDLE3_CORE);
 207         OMAP24XX_SAVE(CM_AUTOIDLE4_CORE);
 208         OMAP24XX_SAVE(CM_AUTOIDLE_WKUP);
 209         OMAP24XX_SAVE(CM_AUTOIDLE_PLL);
 210         OMAP24XX_SAVE(CM_AUTOIDLE_DSP);
 211         OMAP24XX_SAVE(CM_AUTOIDLE_MDM);
 212
 213         /* Save idle state registers */
 214         OMAP24XX_SAVE(CM_IDLEST1_CORE);
 215         OMAP24XX_SAVE(CM_IDLEST2_CORE);
 216         OMAP24XX_SAVE(CM_IDLEST3_CORE);
 217         OMAP24XX_SAVE(CM_IDLEST4_CORE);
 218         OMAP24XX_SAVE(CM_IDLEST_GFX);
 219         OMAP24XX_SAVE(CM_IDLEST_WKUP);
 220         OMAP24XX_SAVE(CM_IDLEST_CKGEN);
 221         OMAP24XX_SAVE(CM_IDLEST_DSP);
 222         OMAP24XX_SAVE(CM_IDLEST_MDM);
 223
 224         /* Save clock registers */
 225         OMAP24XX_SAVE(CM_FCLKEN1_CORE);
 226         OMAP24XX_SAVE(CM_FCLKEN2_CORE);
 227         OMAP24XX_SAVE(CM_ICLKEN1_CORE);
 228         OMAP24XX_SAVE(CM_ICLKEN2_CORE);
 229         OMAP24XX_SAVE(CM_ICLKEN3_CORE);
 230         OMAP24XX_SAVE(CM_ICLKEN4_CORE);
 231 }
 232
 233 static inline void omap2_pm_restore_registers(void)
 234 {
 235         /* Restore clock state registers */
 236         OMAP24XX_RESTORE(CM_CLKSTCTRL_MPU);
 237         OMAP24XX_RESTORE(CM_CLKSTCTRL_CORE);
 238         OMAP24XX_RESTORE(CM_CLKSTCTRL_GFX);
 239         OMAP24XX_RESTORE(CM_CLKSTCTRL_DSP);
 240         OMAP24XX_RESTORE(CM_CLKSTCTRL_MDM);
 241
 242         /* Restore power state registers */
 243         OMAP24XX_RESTORE(PM_PWSTCTRL_MPU);
 244         OMAP24XX_RESTORE(PM_PWSTCTRL_CORE);
 245         OMAP24XX_RESTORE(PM_PWSTCTRL_GFX);
 246         OMAP24XX_RESTORE(PM_PWSTCTRL_DSP);
 247         OMAP24XX_RESTORE(PM_PWSTCTRL_MDM);
 248
 249         /* Restore idle state registers */
 250         OMAP24XX_RESTORE(CM_IDLEST1_CORE);
 251         OMAP24XX_RESTORE(CM_IDLEST2_CORE);
 252         OMAP24XX_RESTORE(CM_IDLEST3_CORE);
 253         OMAP24XX_RESTORE(CM_IDLEST4_CORE);
 254         OMAP24XX_RESTORE(CM_IDLEST_GFX);
 255         OMAP24XX_RESTORE(CM_IDLEST_WKUP);
 256         OMAP24XX_RESTORE(CM_IDLEST_CKGEN);
 257         OMAP24XX_RESTORE(CM_IDLEST_DSP);
 258         OMAP24XX_RESTORE(CM_IDLEST_MDM);
 259
 260         /* Restore autoidle registers */
 261         OMAP24XX_RESTORE(CM_AUTOIDLE1_CORE);
 262         OMAP24XX_RESTORE(CM_AUTOIDLE2_CORE);
 263         OMAP24XX_RESTORE(CM_AUTOIDLE3_CORE);
 264         OMAP24XX_RESTORE(CM_AUTOIDLE4_CORE);
 265         OMAP24XX_RESTORE(CM_AUTOIDLE_WKUP);
 266         OMAP24XX_RESTORE(CM_AUTOIDLE_PLL);
 267         OMAP24XX_RESTORE(CM_AUTOIDLE_DSP);
 268         OMAP24XX_RESTORE(CM_AUTOIDLE_MDM);
 269
 270         /* Restore clock registers */
 271         OMAP24XX_RESTORE(CM_FCLKEN1_CORE);
 272         OMAP24XX_RESTORE(CM_FCLKEN2_CORE);
 273         OMAP24XX_RESTORE(CM_ICLKEN1_CORE);
 274         OMAP24XX_RESTORE(CM_ICLKEN2_CORE);
 275         OMAP24XX_RESTORE(CM_ICLKEN3_CORE);
 276         OMAP24XX_RESTORE(CM_ICLKEN4_CORE);
 277
 278         /* REVISIT: Clear interrupts here */
 279
 280         /* Restore interrupt registers */
 281         OMAP24XX_RESTORE(INTC_MIR0);
 282         OMAP24XX_RESTORE(INTC_MIR1);
 283         OMAP24XX_RESTORE(INTC_MIR2);
 284 }
 285
 286 static int omap2_pm_suspend(void)
 287 {
 288         int processor_type = 0;
 289
 290         /* REVISIT: 0x21 or 0x26? */
 291         if (cpu_is_omap2420())
 292                 processor_type = 0x21;
 293
 294         if (!processor_type)
 295                 return -ENOTSUPP;
 296
 297         local_irq_disable();
 298         local_fiq_disable();
 299
 300         omap2_pm_save_registers();
 301
 302         /* Disable interrupts except for the wake events */
 303         INTC_MIR_SET0 = 0xffffffff & ~INT0_WAKE_MASK;
 304         INTC_MIR_SET1 = 0xffffffff & ~INT1_WAKE_MASK;
 305         INTC_MIR_SET2 = 0xffffffff & ~INT2_WAKE_MASK;
 306
 307         pmdomain_set_autoidle();
 308
 309         /* Clear old wake-up events */
 310         PM_WKST1_CORE = 0;
 311         PM_WKST2_CORE = 0;
 312         PM_WKST_WKUP = 0;
 313
 314         /* Enable wake-up events */
 315         PM_WKEN1_CORE = (1 << 22) | (1 << 21);  /* UART1 & 2 */
 316         PM_WKEN2_CORE = (1 << 2);               /* UART3 */
 317         PM_WKEN_WKUP = (1 << 2) | (1 << 0);     /* GPIO & GPT1 */
 318
 319         /* Disable clocks except for CM_ICLKEN2_CORE. It gets disabled
 320          * in the SRAM suspend code */
 321         CM_FCLKEN1_CORE = 0;
 322         CM_FCLKEN2_CORE = 0;
 323         CM_ICLKEN1_CORE = 0;
 324         CM_ICLKEN3_CORE = 0;
 325         CM_ICLKEN4_CORE = 0;
 326
 327         omap2_pm_debug("Status before suspend");
 328
 329         /* Must wait for serial buffers to clear */
 330         mdelay(200);
 331
 332         /* Jump to SRAM suspend code
 333          * REVISIT: When is this SDRC_DLLB_CTRL?
 334          */
 335         omap2_sram_suspend(SDRC_DLLA_CTRL, processor_type);
 336
 337         /* Back from sleep */
 338         omap2_pm_restore_registers();
 339
 340         local_fiq_enable();
 341         local_irq_enable();
 342
 343         return 0;
 344 }
 345
 346 static int omap2_pm_enter(suspend_state_t state)
 347 {
 348         int ret = 0;
 349
 350         switch (state)
 351         {
 352         case PM_SUSPEND_STANDBY:
 353         case PM_SUSPEND_MEM:
 354                 ret = omap2_pm_suspend();
 355                 break;
 356         case PM_SUSPEND_DISK:
 357                 ret = -ENOTSUPP;
 358                 break;
 359         default:
 360                 ret = -EINVAL;
 361         }
 362
 363         return ret;
 364 }
 365
 366 static int omap2_pm_finish(suspend_state_t state)
 367 {
 368         pm_idle = saved_idle;
 369         return 0;
 370 }
 371
 372 static struct pm_ops omap_pm_ops = {
 373         .prepare        = omap2_pm_prepare,
 374         .enter          = omap2_pm_enter,
 375         .finish         = omap2_pm_finish,
 376         .valid          = pm_valid_only_mem,
 377 };
 378
 379 int __init omap2_pm_init(void)
 380 {
 381         printk("Power Management for TI OMAP.\n");
 382
 383         vclk = clk_get(NULL, "virt_prcm_set");
 384         if (IS_ERR(vclk)) {
 385                 printk(KERN_ERR "Could not get PM vclk\n");
 386                 return -ENODEV;
 387         }
 388
 389         /*
 390          * We copy the assembler sleep/wakeup routines to SRAM.
 391          * These routines need to be in SRAM as that's the only
 392          * memory the MPU can see when it wakes up.
 393          */
 394         omap2_sram_idle = omap_sram_push(omap24xx_idle_loop_suspend,
 395                                          omap24xx_idle_loop_suspend_sz);
 396
 397         omap2_sram_suspend = omap_sram_push(omap24xx_cpu_suspend,
 398                                             omap24xx_cpu_suspend_sz);
 399
 400         pm_set_ops(&omap_pm_ops);
 401         pm_idle = omap2_pm_idle;
 402
 403         pmdomain_init();
 404
 405         return 0;
 406 }
 407
 408 __initcall(omap2_pm_init);