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   1 /*
   2  * File:         arch/blackfin/mach-common/pm.c
   3  * Based on:     arm/mach-omap/pm.c
   4  * Author:       Cliff Brake <cbrake@accelent.com> Copyright (c) 2001
   5  *
   6  * Created:      2001
   7  * Description:  Blackfin power management
   8  *
   9  * Modified:     Nicolas Pitre - PXA250 support
  10  *                Copyright (c) 2002 Monta Vista Software, Inc.
  11  *               David Singleton - OMAP1510
  12  *                Copyright (c) 2002 Monta Vista Software, Inc.
  13  *               Dirk Behme <dirk.behme@de.bosch.com> - OMAP1510/1610
  14  *                Copyright 2004
  15  *               Copyright 2004-2008 Analog Devices Inc.
  16  *
  17  * Bugs:         Enter bugs at http://blackfin.uclinux.org/
  18  *
  19  * This program is free software; you can redistribute it and/or modify
  20  * it under the terms of the GNU General Public License as published by
  21  * the Free Software Foundation; either version 2 of the License, or
  22  * (at your option) any later version.
  23  *
  24  * This program is distributed in the hope that it will be useful,
  25  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  27  * GNU General Public License for more details.
  28  *
  29  * You should have received a copy of the GNU General Public License
  30  * along with this program; if not, see the file COPYING, or write
  31  * to the Free Software Foundation, Inc.,
  32  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  33  */
  34
  35 #include <linux/suspend.h>
  36 #include <linux/sched.h>
  37 #include <linux/proc_fs.h>
  38 #include <linux/io.h>
  39 #include <linux/irq.h>
  40
  41 #include <asm/gpio.h>
  42 #include <asm/dma.h>
  43 #include <asm/dpmc.h>
  44
  45 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_H
  46 #define WAKEUP_TYPE     PM_WAKE_HIGH
  47 #endif
  48
  49 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_L
  50 #define WAKEUP_TYPE     PM_WAKE_LOW
  51 #endif
  52
  53 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_F
  54 #define WAKEUP_TYPE     PM_WAKE_FALLING
  55 #endif
  56
  57 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_R
  58 #define WAKEUP_TYPE     PM_WAKE_RISING
  59 #endif
  60
  61 #ifdef CONFIG_PM_WAKEUP_GPIO_POLAR_EDGE_B
  62 #define WAKEUP_TYPE     PM_WAKE_BOTH_EDGES
  63 #endif
  64
  65
  66 void bfin_pm_suspend_standby_enter(void)
  67 {
  68         unsigned long flags;
  69
  70 #ifdef CONFIG_PM_WAKEUP_BY_GPIO
  71         gpio_pm_wakeup_request(CONFIG_PM_WAKEUP_GPIO_NUMBER, WAKEUP_TYPE);
  72 #endif
  73
  74         local_irq_save_hw(flags);
  75         bfin_pm_standby_setup();
  76
  77 #ifdef CONFIG_PM_BFIN_SLEEP_DEEPER
  78         sleep_deeper(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
  79 #else
  80         sleep_mode(bfin_sic_iwr[0], bfin_sic_iwr[1], bfin_sic_iwr[2]);
  81 #endif
  82
  83         bfin_pm_standby_restore();
  84
  85 #ifdef SIC_IWR0
  86         bfin_write_SIC_IWR0(IWR_DISABLE_ALL);
  87 # ifdef SIC_IWR1
  88         /* BF52x system reset does not properly reset SIC_IWR1 which
  89          * will screw up the bootrom as it relies on MDMA0/1 waking it
  90          * up from IDLE instructions.  See this report for more info:
  91          * http://blackfin.uclinux.org/gf/tracker/4323
  92          */
  93         if (ANOMALY_05000435)
  94                 bfin_write_SIC_IWR1(IWR_ENABLE(10) | IWR_ENABLE(11));
  95         else
  96                 bfin_write_SIC_IWR1(IWR_DISABLE_ALL);
  97 # endif
  98 # ifdef SIC_IWR2
  99         bfin_write_SIC_IWR2(IWR_DISABLE_ALL);
 100 # endif
 101 #else
 102         bfin_write_SIC_IWR(IWR_DISABLE_ALL);
 103 #endif
 104
 105         local_irq_restore_hw(flags);
 106 }
 107
 108 int bf53x_suspend_l1_mem(unsigned char *memptr)
 109 {
 110         dma_memcpy(memptr, (const void *) L1_CODE_START, L1_CODE_LENGTH);
 111         dma_memcpy(memptr + L1_CODE_LENGTH, (const void *) L1_DATA_A_START,
 112                         L1_DATA_A_LENGTH);
 113         dma_memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH,
 114                         (const void *) L1_DATA_B_START, L1_DATA_B_LENGTH);
 115         memcpy(memptr + L1_CODE_LENGTH + L1_DATA_A_LENGTH +
 116                         L1_DATA_B_LENGTH, (const void *) L1_SCRATCH_START,
 117                         L1_SCRATCH_LENGTH);
 118
 119         return 0;
 120 }
 121
 122 int bf53x_resume_l1_mem(unsigned char *memptr)
 123 {
 124         dma_memcpy((void *) L1_CODE_START, memptr, L1_CODE_LENGTH);
 125         dma_memcpy((void *) L1_DATA_A_START, memptr + L1_CODE_LENGTH,
 126                         L1_DATA_A_LENGTH);
 127         dma_memcpy((void *) L1_DATA_B_START, memptr + L1_CODE_LENGTH +
 128                         L1_DATA_A_LENGTH, L1_DATA_B_LENGTH);
 129         memcpy((void *) L1_SCRATCH_START, memptr + L1_CODE_LENGTH +
 130                         L1_DATA_A_LENGTH + L1_DATA_B_LENGTH, L1_SCRATCH_LENGTH);
 131
 132         return 0;
 133 }
 134
 135 #ifdef CONFIG_BFIN_WB
 136 static void flushinv_all_dcache(void)
 137 {
 138         u32 way, bank, subbank, set;
 139         u32 status, addr;
 140         u32 dmem_ctl = bfin_read_DMEM_CONTROL();
 141
 142         for (bank = 0; bank < 2; ++bank) {
 143                 if (!(dmem_ctl & (1 << (DMC1_P - bank))))
 144                         continue;
 145
 146                 for (way = 0; way < 2; ++way)
 147                         for (subbank = 0; subbank < 4; ++subbank)
 148                                 for (set = 0; set < 64; ++set) {
 149
 150                                         bfin_write_DTEST_COMMAND(
 151                                                 way << 26 |
 152                                                 bank << 23 |
 153                                                 subbank << 16 |
 154                                                 set << 5
 155                                         );
 156                                         CSYNC();
 157                                         status = bfin_read_DTEST_DATA0();
 158
 159                                         /* only worry about valid/dirty entries */
 160                                         if ((status & 0x3) != 0x3)
 161                                                 continue;
 162
 163                                         /* construct the address using the tag */
 164                                         addr = (status & 0xFFFFC800) | (subbank << 12) | (set << 5);
 165
 166                                         /* flush it */
 167                                         __asm__ __volatile__("FLUSHINV[%0];" : : "a"(addr));
 168                                 }
 169         }
 170 }
 171 #endif
 172
 173 static inline void dcache_disable(void)
 174 {
 175 #ifdef CONFIG_BFIN_DCACHE
 176         unsigned long ctrl;
 177
 178 #ifdef CONFIG_BFIN_WB
 179         flushinv_all_dcache();
 180 #endif
 181         SSYNC();
 182         ctrl = bfin_read_DMEM_CONTROL();
 183         ctrl &= ~ENDCPLB;
 184         bfin_write_DMEM_CONTROL(ctrl);
 185         SSYNC();
 186 #endif
 187 }
 188
 189 static inline void dcache_enable(void)
 190 {
 191 #ifdef CONFIG_BFIN_DCACHE
 192         unsigned long ctrl;
 193         SSYNC();
 194         ctrl = bfin_read_DMEM_CONTROL();
 195         ctrl |= ENDCPLB;
 196         bfin_write_DMEM_CONTROL(ctrl);
 197         SSYNC();
 198 #endif
 199 }
 200
 201 static inline void icache_disable(void)
 202 {
 203 #ifdef CONFIG_BFIN_ICACHE
 204         unsigned long ctrl;
 205         SSYNC();
 206         ctrl = bfin_read_IMEM_CONTROL();
 207         ctrl &= ~ENICPLB;
 208         bfin_write_IMEM_CONTROL(ctrl);
 209         SSYNC();
 210 #endif
 211 }
 212
 213 static inline void icache_enable(void)
 214 {
 215 #ifdef CONFIG_BFIN_ICACHE
 216         unsigned long ctrl;
 217         SSYNC();
 218         ctrl = bfin_read_IMEM_CONTROL();
 219         ctrl |= ENICPLB;
 220         bfin_write_IMEM_CONTROL(ctrl);
 221         SSYNC();
 222 #endif
 223 }
 224
 225 int bfin_pm_suspend_mem_enter(void)
 226 {
 227         unsigned long flags;
 228         int wakeup, ret;
 229
 230         unsigned char *memptr = kmalloc(L1_CODE_LENGTH + L1_DATA_A_LENGTH
 231                                          + L1_DATA_B_LENGTH + L1_SCRATCH_LENGTH,
 232                                           GFP_KERNEL);
 233
 234         if (memptr == NULL) {
 235                 panic("bf53x_suspend_l1_mem malloc failed");
 236                 return -ENOMEM;
 237         }
 238
 239         wakeup = bfin_read_VR_CTL() & ~FREQ;
 240         wakeup |= SCKELOW;
 241
 242 #ifdef CONFIG_PM_BFIN_WAKE_PH6
 243         wakeup |= PHYWE;
 244 #endif
 245 #ifdef CONFIG_PM_BFIN_WAKE_GP
 246         wakeup |= GPWE;
 247 #endif
 248
 249         local_irq_save_hw(flags);
 250
 251         ret = blackfin_dma_suspend();
 252
 253         if (ret) {
 254                 local_irq_restore_hw(flags);
 255                 kfree(memptr);
 256                 return ret;
 257         }
 258
 259         bfin_gpio_pm_hibernate_suspend();
 260
 261         dcache_disable();
 262         icache_disable();
 263         bf53x_suspend_l1_mem(memptr);
 264
 265         do_hibernate(wakeup | vr_wakeup);       /* Goodbye */
 266
 267         bf53x_resume_l1_mem(memptr);
 268
 269         icache_enable();
 270         dcache_enable();
 271
 272         bfin_gpio_pm_hibernate_restore();
 273         blackfin_dma_resume();
 274
 275         local_irq_restore_hw(flags);
 276         kfree(memptr);
 277
 278         return 0;
 279 }
 280
 281 /*
 282  *      bfin_pm_valid - Tell the PM core that we only support the standby sleep
 283  *                      state
 284  *      @state:         suspend state we're checking.
 285  *
 286  */
 287 static int bfin_pm_valid(suspend_state_t state)
 288 {
 289         return (state == PM_SUSPEND_STANDBY
 290 #if !(defined(BF533_FAMILY) || defined(CONFIG_BF561))
 291         /*
 292          * On BF533/2/1:
 293          * If we enter Hibernate the SCKE Pin is driven Low,
 294          * so that the SDRAM enters Self Refresh Mode.
 295          * However when the reset sequence that follows hibernate
 296          * state is executed, SCKE is driven High, taking the
 297          * SDRAM out of Self Refresh.
 298          *
 299          * If you reconfigure and access the SDRAM "very quickly",
 300          * you are likely to avoid errors, otherwise the SDRAM
 301          * start losing its contents.
 302          * An external HW workaround is possible using logic gates.
 303          */
 304         || state == PM_SUSPEND_MEM
 305 #endif
 306         );
 307 }
 308
 309 /*
 310  *      bfin_pm_enter - Actually enter a sleep state.
 311  *      @state:         State we're entering.
 312  *
 313  */
 314 static int bfin_pm_enter(suspend_state_t state)
 315 {
 316         switch (state) {
 317         case PM_SUSPEND_STANDBY:
 318                 bfin_pm_suspend_standby_enter();
 319                 break;
 320         case PM_SUSPEND_MEM:
 321                 bfin_pm_suspend_mem_enter();
 322                 break;
 323         default:
 324                 return -EINVAL;
 325         }
 326
 327         return 0;
 328 }
 329
 330 struct platform_suspend_ops bfin_pm_ops = {
 331         .enter = bfin_pm_enter,
 332         .valid  = bfin_pm_valid,
 333 };
 334
 335 static int __init bfin_pm_init(void)
 336 {
 337         suspend_set_ops(&bfin_pm_ops);
 338         return 0;
 339 }
 340
 341 __initcall(bfin_pm_init);