arch/blackfin/mach-bf609/pm.c

   1 /*
   2  * Blackfin bf609 power management
   3  *
   4  * Copyright 2011 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2
   7  */
   8
   9 #include <linux/suspend.h>
  10 #include <linux/io.h>
  11 #include <linux/interrupt.h>
  12 #include <linux/gpio.h>
  13 #include <linux/irq.h>
  14 #include <linux/delay.h>
  15 #include <linux/syscore_ops.h>
  16
  17 #include <asm/dpmc.h>
  18 #include <asm/pm.h>
  19 #include <mach/pm.h>
  20 #include <asm/blackfin.h>
  21 #include <asm/mem_init.h>
  22
  23 /***********************************************************/
  24 /*                                                         */
  25 /* Wakeup Actions for DPM_RESTORE                          */
  26 /*                                                         */
  27 /***********************************************************/
  28 #define BITP_ROM_WUA_CHKHDR             24
  29 #define BITP_ROM_WUA_DDRLOCK            7
  30 #define BITP_ROM_WUA_DDRDLLEN           6
  31 #define BITP_ROM_WUA_DDR                5
  32 #define BITP_ROM_WUA_CGU                4
  33 #define BITP_ROM_WUA_MEMBOOT            2
  34 #define BITP_ROM_WUA_EN                 1
  35
  36 #define BITM_ROM_WUA_CHKHDR             (0xFF000000)
  37 #define ENUM_ROM_WUA_CHKHDR_AD                  0xAD000000
  38
  39 #define BITM_ROM_WUA_DDRLOCK            (0x00000080)
  40 #define BITM_ROM_WUA_DDRDLLEN           (0x00000040)
  41 #define BITM_ROM_WUA_DDR                (0x00000020)
  42 #define BITM_ROM_WUA_CGU                (0x00000010)
  43 #define BITM_ROM_WUA_MEMBOOT            (0x00000002)
  44 #define BITM_ROM_WUA_EN                 (0x00000001)
  45
  46 /***********************************************************/
  47 /*                                                         */
  48 /* Syscontrol                                              */
  49 /*                                                         */
  50 /***********************************************************/
  51 #define BITP_ROM_SYSCTRL_CGU_LOCKINGEN  28    /* unlocks CGU_CTL register */
  52 #define BITP_ROM_SYSCTRL_WUA_OVERRIDE   24
  53 #define BITP_ROM_SYSCTRL_WUA_DDRDLLEN   20    /* Saves the DDR DLL and PADS registers to the DPM registers */
  54 #define BITP_ROM_SYSCTRL_WUA_DDR        19    /* Saves the DDR registers to the DPM registers */
  55 #define BITP_ROM_SYSCTRL_WUA_CGU        18    /* Saves the CGU registers into DPM registers */
  56 #define BITP_ROM_SYSCTRL_WUA_DPMWRITE   17    /* Saves the Syscontrol structure structure contents into DPM registers */
  57 #define BITP_ROM_SYSCTRL_WUA_EN         16    /* reads current PLL and DDR configuration into structure */
  58 #define BITP_ROM_SYSCTRL_DDR_WRITE      13    /* writes the DDR registers from Syscontrol structure for wakeup initialization of DDR */
  59 #define BITP_ROM_SYSCTRL_DDR_READ       12    /* Read the DDR registers into the Syscontrol structure for storing prior to hibernate */
  60 #define BITP_ROM_SYSCTRL_CGU_AUTODIS    11    /* Disables auto handling of UPDT and ALGN fields */
  61 #define BITP_ROM_SYSCTRL_CGU_CLKOUTSEL  7    /* access CGU_CLKOUTSEL register */
  62 #define BITP_ROM_SYSCTRL_CGU_DIV        6    /* access CGU_DIV register */
  63 #define BITP_ROM_SYSCTRL_CGU_STAT       5    /* access CGU_STAT register */
  64 #define BITP_ROM_SYSCTRL_CGU_CTL        4    /* access CGU_CTL register */
  65 #define BITP_ROM_SYSCTRL_CGU_RTNSTAT    2    /* Update structure STAT field upon error */
  66 #define BITP_ROM_SYSCTRL_WRITE          1    /* write registers */
  67 #define BITP_ROM_SYSCTRL_READ           0    /* read registers */
  68
  69 #define BITM_ROM_SYSCTRL_CGU_READ       (0x00000001)    /* Read CGU registers */
  70 #define BITM_ROM_SYSCTRL_CGU_WRITE      (0x00000002)    /* Write registers */
  71 #define BITM_ROM_SYSCTRL_CGU_RTNSTAT    (0x00000004)    /* Update structure STAT field upon error or after a write operation */
  72 #define BITM_ROM_SYSCTRL_CGU_CTL        (0x00000010)    /* Access CGU_CTL register */
  73 #define BITM_ROM_SYSCTRL_CGU_STAT       (0x00000020)    /* Access CGU_STAT register */
  74 #define BITM_ROM_SYSCTRL_CGU_DIV        (0x00000040)    /* Access CGU_DIV register */
  75 #define BITM_ROM_SYSCTRL_CGU_CLKOUTSEL  (0x00000080)    /* Access CGU_CLKOUTSEL register */
  76 #define BITM_ROM_SYSCTRL_CGU_AUTODIS    (0x00000800)    /* Disables auto handling of UPDT and ALGN fields */
  77 #define BITM_ROM_SYSCTRL_DDR_READ       (0x00001000)    /* Reads the contents of the DDR registers and stores them into the structure */
  78 #define BITM_ROM_SYSCTRL_DDR_WRITE      (0x00002000)    /* Writes the DDR registers from the structure, only really intented for wakeup functionality and not for full DDR configuration */
  79 #define BITM_ROM_SYSCTRL_WUA_EN         (0x00010000)    /* Wakeup entry or exit opertation enable */
  80 #define BITM_ROM_SYSCTRL_WUA_DPMWRITE   (0x00020000)    /* When set indicates a restore of the PLL and DDR is to be performed otherwise a save is required */
  81 #define BITM_ROM_SYSCTRL_WUA_CGU        (0x00040000)    /* Only applicable for a PLL and DDR save operation to the DPM, saves the current settings if cleared or the contents of the structure if set */
  82 #define BITM_ROM_SYSCTRL_WUA_DDR        (0x00080000)    /* Only applicable for a PLL and DDR save operation to the DPM, saves the current settings if cleared or the contents of the structure if set */
  83 #define BITM_ROM_SYSCTRL_WUA_DDRDLLEN   (0x00100000)    /* Enables saving/restoring of the DDR DLLCTL register */
  84 #define BITM_ROM_SYSCTRL_WUA_OVERRIDE   (0x01000000)
  85 #define BITM_ROM_SYSCTRL_CGU_LOCKINGEN  (0x10000000)    /* Unlocks the CGU_CTL register */
  86
  87
  88 /* Structures for the syscontrol() function */
  89 struct STRUCT_ROM_SYSCTRL {
  90         uint32_t ulCGU_CTL;
  91         uint32_t ulCGU_STAT;
  92         uint32_t ulCGU_DIV;
  93         uint32_t ulCGU_CLKOUTSEL;
  94         uint32_t ulWUA_Flags;
  95         uint32_t ulWUA_BootAddr;
  96         uint32_t ulWUA_User;
  97         uint32_t ulDDR_CTL;
  98         uint32_t ulDDR_CFG;
  99         uint32_t ulDDR_TR0;
 100         uint32_t ulDDR_TR1;
 101         uint32_t ulDDR_TR2;
 102         uint32_t ulDDR_MR;
 103         uint32_t ulDDR_EMR1;
 104         uint32_t ulDDR_EMR2;
 105         uint32_t ulDDR_PADCTL;
 106         uint32_t ulDDR_DLLCTL;
 107         uint32_t ulReserved;
 108 };
 109
 110 struct bfin_pm_data {
 111         uint32_t magic;
 112         uint32_t resume_addr;
 113         uint32_t sp;
 114 };
 115
 116 struct bfin_pm_data bf609_pm_data;
 117
 118 struct STRUCT_ROM_SYSCTRL configvalues;
 119 uint32_t dactionflags;
 120
 121 #define FUNC_ROM_SYSCONTROL 0xC8000080
 122 __attribute__((l1_data))
 123 static uint32_t (* const bfrom_SysControl)(uint32_t action_flags, struct STRUCT_ROM_SYSCTRL *settings, void *reserved) = (void *)FUNC_ROM_SYSCONTROL;
 124
 125 __attribute__((l1_text))
 126 void bfin_cpu_suspend(void)
 127 {
 128         __asm__ __volatile__( \
 129                         ".align 8;" \
 130                         "idle;" \
 131                         : : \
 132                         );
 133 }
 134
 135 __attribute__((l1_text))
 136 void bf609_ddr_sr(void)
 137 {
 138         dmc_enter_self_refresh();
 139 }
 140
 141 __attribute__((l1_text))
 142 void bf609_ddr_sr_exit(void)
 143 {
 144         dmc_exit_self_refresh();
 145
 146         /* After wake up from deep sleep and exit DDR from self refress mode,
 147          * should wait till CGU PLL is locked.
 148          */
 149         while (bfin_read32(CGU0_STAT) & CLKSALGN)
 150                 continue;
 151 }
 152
 153 __attribute__((l1_text))
 154 void bf609_resume_ccbuf(void)
 155 {
 156         bfin_write32(DPM0_CCBF_EN, 3);
 157         bfin_write32(DPM0_CTL, 2);
 158
 159         while ((bfin_read32(DPM0_STAT) & 0xf) != 1);
 160 }
 161
 162 __attribute__((l1_text))
 163 void bfin_hibernate_syscontrol(void)
 164 {
 165         configvalues.ulWUA_Flags = (0xAD000000 | BITM_ROM_WUA_EN
 166                 | BITM_ROM_WUA_CGU | BITM_ROM_WUA_DDR | BITM_ROM_WUA_DDRDLLEN);
 167
 168         dactionflags = (BITM_ROM_SYSCTRL_WUA_EN
 169                 | BITM_ROM_SYSCTRL_WUA_DPMWRITE | BITM_ROM_SYSCTRL_WUA_CGU
 170                 | BITM_ROM_SYSCTRL_WUA_DDR | BITM_ROM_SYSCTRL_WUA_DDRDLLEN);
 171
 172         bfrom_SysControl(dactionflags, &configvalues, NULL);
 173
 174         bfin_write32(DPM0_RESTORE5, bfin_read32(DPM0_RESTORE5) | 4);
 175 }
 176
 177 asmlinkage void enter_deepsleep(void);
 178
 179 __attribute__((l1_text))
 180 void bfin_deepsleep(unsigned long mask, unsigned long pol_mask)
 181 {
 182         bfin_write32(DPM0_WAKE_EN, mask);
 183         bfin_write32(DPM0_WAKE_POL, pol_mask);
 184         SSYNC();
 185         enter_deepsleep();
 186 }
 187
 188 void bfin_hibernate(unsigned long mask, unsigned long pol_mask)
 189 {
 190         bfin_write32(DPM0_WAKE_EN, mask);
 191         bfin_write32(DPM0_WAKE_POL, pol_mask);
 192         bfin_write32(DPM0_PGCNTR, 0x0000FFFF);
 193         bfin_write32(DPM0_HIB_DIS, 0xFFFF);
 194
 195         bf609_hibernate();
 196 }
 197
 198 void bf609_cpu_pm_enter(suspend_state_t state)
 199 {
 200         int error;
 201         unsigned long wakeup = 0;
 202         unsigned long wakeup_pol = 0;
 203
 204 #ifdef CONFIG_PM_BFIN_WAKE_PA15
 205         wakeup |= PA15WE;
 206 # if CONFIG_PM_BFIN_WAKE_PA15_POL
 207         wakeup_pol |= PA15WE;
 208 # endif
 209 #endif
 210
 211 #ifdef CONFIG_PM_BFIN_WAKE_PB15
 212         wakeup |= PB15WE;
 213 # if CONFIG_PM_BFIN_WAKE_PB15_POL
 214         wakeup_pol |= PB15WE;
 215 # endif
 216 #endif
 217
 218 #ifdef CONFIG_PM_BFIN_WAKE_PC15
 219         wakeup |= PC15WE;
 220 # if CONFIG_PM_BFIN_WAKE_PC15_POL
 221         wakeup_pol |= PC15WE;
 222 # endif
 223 #endif
 224
 225 #ifdef CONFIG_PM_BFIN_WAKE_PD06
 226         wakeup |= PD06WE;
 227 # if CONFIG_PM_BFIN_WAKE_PD06_POL
 228         wakeup_pol |= PD06WE;
 229 # endif
 230 #endif
 231
 232 #ifdef CONFIG_PM_BFIN_WAKE_PE12
 233         wakeup |= PE12WE;
 234 # if CONFIG_PM_BFIN_WAKE_PE12_POL
 235         wakeup_pol |= PE12WE;
 236 # endif
 237 #endif
 238
 239 #ifdef CONFIG_PM_BFIN_WAKE_PG04
 240         wakeup |= PG04WE;
 241 # if CONFIG_PM_BFIN_WAKE_PG04_POL
 242         wakeup_pol |= PG04WE;
 243 # endif
 244 #endif
 245
 246 #ifdef CONFIG_PM_BFIN_WAKE_PG13
 247         wakeup |= PG13WE;
 248 # if CONFIG_PM_BFIN_WAKE_PG13_POL
 249         wakeup_pol |= PG13WE;
 250 # endif
 251 #endif
 252
 253 #ifdef CONFIG_PM_BFIN_WAKE_USB
 254         wakeup |= USBWE;
 255 # if CONFIG_PM_BFIN_WAKE_USB_POL
 256         wakeup_pol |= USBWE;
 257 # endif
 258 #endif
 259
 260         error = irq_set_irq_wake(255, 1);
 261         if(error < 0)
 262                 printk(KERN_DEBUG "Unable to get irq wake\n");
 263         error = irq_set_irq_wake(231, 1);
 264         if (error < 0)
 265                 printk(KERN_DEBUG "Unable to get irq wake\n");
 266
 267         if (state == PM_SUSPEND_STANDBY)
 268                 bfin_deepsleep(wakeup, wakeup_pol);
 269         else {
 270                 bfin_hibernate(wakeup, wakeup_pol);
 271         }
 272
 273 }
 274
 275 int bf609_cpu_pm_prepare(void)
 276 {
 277         return 0;
 278 }
 279
 280 void bf609_cpu_pm_finish(void)
 281 {
 282
 283 }
 284
 285 static struct bfin_cpu_pm_fns bf609_cpu_pm = {
 286         .enter          = bf609_cpu_pm_enter,
 287         .prepare        = bf609_cpu_pm_prepare,
 288         .finish         = bf609_cpu_pm_finish,
 289 };
 290
 291 #if defined(CONFIG_MTD_PHYSMAP) || defined(CONFIG_MTD_PHYSMAP_MODULE)
 292 static int smc_pm_syscore_suspend(void)
 293 {
 294         bf609_nor_flash_exit();
 295         return 0;
 296 }
 297
 298 static void smc_pm_syscore_resume(void)
 299 {
 300         bf609_nor_flash_init();
 301 }
 302
 303 static struct syscore_ops smc_pm_syscore_ops = {
 304         .suspend        = smc_pm_syscore_suspend,
 305         .resume         = smc_pm_syscore_resume,
 306 };
 307 #endif
 308
 309 static irqreturn_t test_isr(int irq, void *dev_id)
 310 {
 311         printk(KERN_DEBUG "gpio irq %d\n", irq);
 312         if (irq == 231)
 313                 bfin_sec_raise_irq(BFIN_SYSIRQ(IRQ_SOFT1));
 314         return IRQ_HANDLED;
 315 }
 316
 317 static irqreturn_t dpm0_isr(int irq, void *dev_id)
 318 {
 319         bfin_write32(DPM0_WAKE_STAT, bfin_read32(DPM0_WAKE_STAT));
 320         bfin_write32(CGU0_STAT, bfin_read32(CGU0_STAT));
 321         return IRQ_HANDLED;
 322 }
 323
 324 static int __init bf609_init_pm(void)
 325 {
 326         int irq;
 327         int error;
 328
 329 #if defined(CONFIG_MTD_PHYSMAP) || defined(CONFIG_MTD_PHYSMAP_MODULE)
 330         register_syscore_ops(&smc_pm_syscore_ops);
 331 #endif
 332
 333 #ifdef CONFIG_PM_BFIN_WAKE_PE12
 334         irq = gpio_to_irq(GPIO_PE12);
 335         if (irq < 0) {
 336                 error = irq;
 337                 printk(KERN_DEBUG "Unable to get irq number for GPIO %d, error %d\n",
 338                                 GPIO_PE12, error);
 339         }
 340
 341         error = request_irq(irq, test_isr, IRQF_TRIGGER_RISING | IRQF_NO_SUSPEND
 342                                 | IRQF_FORCE_RESUME, "gpiope12", NULL);
 343         if(error < 0)
 344                 printk(KERN_DEBUG "Unable to get irq\n");
 345 #endif
 346
 347         error = request_irq(IRQ_CGU_EVT, dpm0_isr, IRQF_NO_SUSPEND |
 348                                 IRQF_FORCE_RESUME, "cgu0 event", NULL);
 349         if(error < 0)
 350                 printk(KERN_DEBUG "Unable to get irq\n");
 351
 352         error = request_irq(IRQ_DPM, dpm0_isr, IRQF_NO_SUSPEND |
 353                                 IRQF_FORCE_RESUME, "dpm0 event", NULL);
 354         if (error < 0)
 355                 printk(KERN_DEBUG "Unable to get irq\n");
 356
 357         bfin_cpu_pm = &bf609_cpu_pm;
 358         return 0;
 359 }
 360
 361 late_initcall(bf609_init_pm);