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