arch/blackfin/mach-common/pm.c

   1 /*
   2  * Blackfin power management
   3  *
   4  * Copyright 2006-2009 Analog Devices Inc.
   5  *
   6  * Licensed under the GPL-2
   7  * based on arm/mach-omap/pm.c
   8  *    Copyright 2001, Cliff Brake <cbrake@accelent.com> and others
   9  */
  10
  11 #include <linux/suspend.h>
  12 #include <linux/sched.h>
  13 #include <linux/proc_fs.h>
  14 #include <linux/slab.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17 #include <linux/delay.h>
  18
  19 #include <asm/cplb.h>
  20 #include <asm/dma.h>
  21 #include <asm/dpmc.h>
  22 #include <asm/pm.h>
  23 #include <asm/gpio.h>
  24
  25 #ifdef CONFIG_BF60x
  26 struct bfin_cpu_pm_fns *bfin_cpu_pm;
  27 #endif
  28
  29 void bfin_pm_suspend_standby_enter(void)
  30 {
  31 #if !BFIN_GPIO_PINT
  32         bfin_pm_standby_setup();
  33 #endif
  34
  35 #ifdef CONFIG_BF60x
  36         bfin_cpu_pm->enter(PM_SUSPEND_STANDBY);
  37 #else
  38 # ifdef CONFIG_PM_BFIN_SLEEP_DEEPER
  39         sleep_deeper(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
  40 # else
  41         sleep_mode(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
  42 # endif
  43 #endif
  44
  45 #if !BFIN_GPIO_PINT
  46         bfin_pm_standby_restore();
  47 #endif
  48
  49 #ifndef CONFIG_BF60x
  50 #ifdef SIC_IWR0
  51         bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
  52 # ifdef SIC_IWR1
  53         /* BF52x system reset does not properly reset SIC_IWR1 which
  54          * will screw up the bootrom as it relies on MDMA0/1 waking it
  55          * up from IDLE instructions.  See this report for more info:
  56          * http://blackfin.uclinux.org/gf/tracker/4323
  57          */
  58         if (ANOMALY_05000435)
  59                 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
  60         else
  61                 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
  62 # endif
  63 # ifdef SIC_IWR2
  64         bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
  65 # endif
  66 #else
  67         bfin_write_SIC_IWR(IWR_DISABLE_ALL);
  68 #endif
  69
  70 #endif
  71 }
  72
  73 int bf53x_suspend_l1_mem(unsigned char *memptr)
  74 {
  75         dma_memcpy_nocache(memptr, (const void *) L1_CODE_START,
  76                         L1_CODE_LENGTH);
  77         dma_memcpy_nocache(memptr + L1_CODE_LENGTH,
  78                         (const void *) L1_DATA_A_START, L1_DATA_A_LENGTH);
  79         dma_memcpy_nocache(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH,
  80                         (const void *) L1_DATA_B_START, L1_DATA_B_LENGTH);
  81         memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH +
  82                         L1_DATA_B_LENGTH, (const void *) L1_SCRATCH_START,
  83                         L1_SCRATCH_LENGTH);
  84
  85         return 0;
  86 }
  87
  88 int bf53x_resume_l1_mem(unsigned char *memptr)
  89 {
  90         dma_memcpy_nocache((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
  91         dma_memcpy_nocache((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
  92                         L1_DATA_A_LENGTH);
  93         dma_memcpy_nocache((void *) L1_DATA_B_START, memptr + L1_CODE_LENGTH +
  94                         L1_DATA_A_LENGTH, L1_DATA_B_LENGTH);
  95         memcpy((void *) L1_SCRATCH_START, memptr + L1_CODE_LENGTH +
  96                         L1_DATA_A_LENGTH + L1_DATA_B_LENGTH, L1_SCRATCH_LENGTH);
  97
  98         return 0;
  99 }
 100
 101 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
 102 # ifdef CONFIG_BF60x
 103 __attribute__((l1_text))
 104 # endif
 105 static void flushinv_all_dcache(void)
 106 {
 107         register u32 way, bank, subbank, set;
 108         register u32 status, addr;
 109         u32 dmem_ctl = bfin_read_DMEM_CONTROL();
 110
 111         for (bank = 0; bank < 2; ++bank) {
 112                 if (!(dmem_ctl & (1 << (DMC1_P - bank))))
 113                         continue;
 114
 115                 for (way = 0; way < 2; ++way)
 116                         for (subbank = 0; subbank < 4; ++subbank)
 117                                 for (set = 0; set < 64; ++set) {
 118
 119                                         bfin_write_DTEST_COMMAND(
 120                                                 way << 26 |
 121                                                 bank << 23 |
 122                                                 subbank << 16 |
 123                                                 set << 5
 124                                         );
 125                                         CSYNC();
 126                                         status = bfin_read_DTEST_DATA0();
 127
 128                                         /* only worry about valid/dirty entries */
 129                                         if ((status & 0x3) != 0x3)
 130                                                 continue;
 131
 132
 133                                         /* construct the address using the tag */
 134                                         addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
 135
 136                                         /* flush it */
 137                                         __asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
 138                                 }
 139         }
 140 }
 141 #endif
 142
 143 int bfin_pm_suspend_mem_enter(void)
 144 {
 145         int ret;
 146 #ifndef CONFIG_BF60x
 147         int wakeup;
 148 #endif
 149
 150         unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
 151                                          + L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
 152                                           GFP_ATOMIC);
 153
 154         if (memptr == NULL) {
 155                 panic("bf53x_suspend_l1_mem malloc failed");
 156                 return -ENOMEM;
 157         }
 158
 159 #ifndef CONFIG_BF60x
 160         wakeup = bfin_read_VR_CTL() & ~FREQ;
 161         wakeup |= SCKELOW;
 162
 163 #ifdef CONFIG_PM_BFIN_WAKE_PH6
 164         wakeup |= PHYWE;
 165 #endif
 166 #ifdef CONFIG_PM_BFIN_WAKE_GP
 167         wakeup |= GPWE;
 168 #endif
 169 #endif
 170
 171         ret = blackfin_dma_suspend();
 172
 173         if (ret) {
 174                 kfree(memptr);
 175                 return ret;
 176         }
 177
 178 #ifdef CONFIG_GPIO_ADI
 179         bfin_gpio_pm_hibernate_suspend();
 180 #endif
 181
 182 #if defined(CONFIG_BFIN_EXTMEM_WRITEBACK) || defined(CONFIG_BFIN_L2_WRITEBACK)
 183         flushinv_all_dcache();
 184         udelay(1);
 185 #endif
 186         _disable_dcplb();
 187         _disable_icplb();
 188         bf53x_suspend_l1_mem(memptr);
 189
 190 #ifndef CONFIG_BF60x
 191         do_hibernate(wakeup | vr_wakeup);       /* See you later! */
 192 #else
 193         bfin_cpu_pm->enter(PM_SUSPEND_MEM);
 194 #endif
 195
 196         bf53x_resume_l1_mem(memptr);
 197
 198         _enable_icplb();
 199         _enable_dcplb();
 200
 201 #ifdef CONFIG_GPIO_ADI
 202         bfin_gpio_pm_hibernate_restore();
 203 #endif
 204         blackfin_dma_resume();
 205
 206         kfree(memptr);
 207
 208         return 0;
 209 }
 210
 211 /*
 212  *      bfin_pm_valid - Tell the PM core that we only support the standby sleep
 213  *                      state
 214  *      @state:         suspend state we're checking.
 215  *
 216  */
 217 static int bfin_pm_valid(suspend_state_t state)
 218 {
 219         return (state == PM_SUSPEND_STANDBY
 220 #if !(defined(BF533_FAMILY) || defined(CONFIG_BF561))
 221         /*
 222          * On BF533/2/1:
 223          * If we enter Hibernate the SCKE Pin is driven Low,
 224          * so that the SDRAM enters Self Refresh Mode.
 225          * However when the reset sequence that follows hibernate
 226          * state is executed, SCKE is driven High, taking the
 227          * SDRAM out of Self Refresh.
 228          *
 229          * If you reconfigure and access the SDRAM "very quickly",
 230          * you are likely to avoid errors, otherwise the SDRAM
 231          * start losing its contents.
 232          * An external HW workaround is possible using logic gates.
 233          */
 234         || state == PM_SUSPEND_MEM
 235 #endif
 236         );
 237 }
 238
 239 /*
 240  *      bfin_pm_enter - Actually enter a sleep state.
 241  *      @state:         State we're entering.
 242  *
 243  */
 244 static int bfin_pm_enter(suspend_state_t state)
 245 {
 246         switch (state) {
 247         case PM_SUSPEND_STANDBY:
 248                 bfin_pm_suspend_standby_enter();
 249                 break;
 250         case PM_SUSPEND_MEM:
 251                 bfin_pm_suspend_mem_enter();
 252                 break;
 253         default:
 254                 return -EINVAL;
 255         }
 256
 257         return 0;
 258 }
 259
 260 #ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
 261 void bfin_pm_end(void)
 262 {
 263         u32 cycle, cycle2;
 264         u64 usec64;
 265         u32 usec;
 266
 267         __asm__ __volatile__ (
 268                 "1: %0 = CYCLES2\n"
 269                 "%1 = CYCLES\n"
 270                 "%2 = CYCLES2\n"
 271                 "CC = %2 == %0\n"
 272                 "if ! CC jump 1b\n"
 273                 : "=d,a" (cycle2), "=d,a" (cycle), "=d,a" (usec) : : "CC"
 274         );
 275
 276         usec64 = ((u64)cycle2 << 32) + cycle;
 277         do_div(usec64, get_cclk() / USEC_PER_SEC);
 278         usec = usec64;
 279         if (usec == 0)
 280                 usec = 1;
 281
 282         pr_info("PM: resume of kernel completes after  %ld msec %03ld usec\n",
 283                 usec / USEC_PER_MSEC, usec % USEC_PER_MSEC);
 284 }
 285 #endif
 286
 287 static const struct platform_suspend_ops bfin_pm_ops = {
 288         .enter = bfin_pm_enter,
 289         .valid  = bfin_pm_valid,
 290 #ifdef CONFIG_BFIN_PM_WAKEUP_TIME_BENCH
 291         .end = bfin_pm_end,
 292 #endif
 293 };
 294
 295 static int __init bfin_pm_init(void)
 296 {
 297         suspend_set_ops(&bfin_pm_ops);
 298         return 0;
 299 }
 300
 301 __initcall(bfin_pm_init);