drivers/soc/ti/pm33xx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * AM33XX Power Management Routines
   4  *
   5  * Copyright (C) 2012-2018 Texas Instruments Incorporated - http://www.ti.com/
   6  *      Vaibhav Bedia, Dave Gerlach
   7  */
   8
   9 #include <linux/cpu.h>
  10 #include <linux/err.h>
  11 #include <linux/genalloc.h>
  12 #include <linux/kernel.h>
  13 #include <linux/init.h>
  14 #include <linux/io.h>
  15 #include <linux/module.h>
  16 #include <linux/of.h>
  17 #include <linux/platform_data/pm33xx.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/sizes.h>
  20 #include <linux/sram.h>
  21 #include <linux/suspend.h>
  22 #include <linux/ti-emif-sram.h>
  23 #include <linux/wkup_m3_ipc.h>
  24
  25 #include <asm/proc-fns.h>
  26 #include <asm/suspend.h>
  27 #include <asm/system_misc.h>
  28
  29 #define AMX3_PM_SRAM_SYMBOL_OFFSET(sym) ((unsigned long)(sym) - \
  30                                          (unsigned long)pm_sram->do_wfi)
  31
  32 static int (*am33xx_do_wfi_sram)(unsigned long unused);
  33 static phys_addr_t am33xx_do_wfi_sram_phys;
  34
  35 static struct gen_pool *sram_pool, *sram_pool_data;
  36 static unsigned long ocmcram_location, ocmcram_location_data;
  37
  38 static struct am33xx_pm_platform_data *pm_ops;
  39 static struct am33xx_pm_sram_addr *pm_sram;
  40
  41 static struct device *pm33xx_dev;
  42 static struct wkup_m3_ipc *m3_ipc;
  43
  44 static u32 sram_suspend_address(unsigned long addr)
  45 {
  46         return ((unsigned long)am33xx_do_wfi_sram +
  47                 AMX3_PM_SRAM_SYMBOL_OFFSET(addr));
  48 }
  49
  50 #ifdef CONFIG_SUSPEND
  51 static int am33xx_pm_suspend(suspend_state_t suspend_state)
  52 {
  53         int i, ret = 0;
  54
  55         ret = pm_ops->soc_suspend((unsigned long)suspend_state,
  56                                   am33xx_do_wfi_sram);
  57
  58         if (ret) {
  59                 dev_err(pm33xx_dev, "PM: Kernel suspend failure\n");
  60         } else {
  61                 i = m3_ipc->ops->request_pm_status(m3_ipc);
  62
  63                 switch (i) {
  64                 case 0:
  65                         dev_info(pm33xx_dev,
  66                                  "PM: Successfully put all powerdomains to target state\n");
  67                         break;
  68                 case 1:
  69                         dev_err(pm33xx_dev,
  70                                 "PM: Could not transition all powerdomains to target state\n");
  71                         ret = -1;
  72                         break;
  73                 default:
  74                         dev_err(pm33xx_dev,
  75                                 "PM: CM3 returned unknown result = %d\n", i);
  76                         ret = -1;
  77                 }
  78         }
  79
  80         return ret;
  81 }
  82
  83 static int am33xx_pm_enter(suspend_state_t suspend_state)
  84 {
  85         int ret = 0;
  86
  87         switch (suspend_state) {
  88         case PM_SUSPEND_MEM:
  89         case PM_SUSPEND_STANDBY:
  90                 ret = am33xx_pm_suspend(suspend_state);
  91                 break;
  92         default:
  93                 ret = -EINVAL;
  94         }
  95
  96         return ret;
  97 }
  98
  99 static int am33xx_pm_begin(suspend_state_t state)
 100 {
 101         int ret = -EINVAL;
 102
 103         switch (state) {
 104         case PM_SUSPEND_MEM:
 105                 ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_DEEPSLEEP);
 106                 break;
 107         case PM_SUSPEND_STANDBY:
 108                 ret = m3_ipc->ops->prepare_low_power(m3_ipc, WKUP_M3_STANDBY);
 109                 break;
 110         }
 111
 112         return ret;
 113 }
 114
 115 static void am33xx_pm_end(void)
 116 {
 117         m3_ipc->ops->finish_low_power(m3_ipc);
 118 }
 119
 120 static int am33xx_pm_valid(suspend_state_t state)
 121 {
 122         switch (state) {
 123         case PM_SUSPEND_STANDBY:
 124         case PM_SUSPEND_MEM:
 125                 return 1;
 126         default:
 127                 return 0;
 128         }
 129 }
 130
 131 static const struct platform_suspend_ops am33xx_pm_ops = {
 132         .begin          = am33xx_pm_begin,
 133         .end            = am33xx_pm_end,
 134         .enter          = am33xx_pm_enter,
 135         .valid          = am33xx_pm_valid,
 136 };
 137 #endif /* CONFIG_SUSPEND */
 138
 139 static void am33xx_pm_set_ipc_ops(void)
 140 {
 141         u32 resume_address;
 142         int temp;
 143
 144         temp = ti_emif_get_mem_type();
 145         if (temp < 0) {
 146                 dev_err(pm33xx_dev, "PM: Cannot determine memory type, no PM available\n");
 147                 return;
 148         }
 149         m3_ipc->ops->set_mem_type(m3_ipc, temp);
 150
 151         /* Physical resume address to be used by ROM code */
 152         resume_address = am33xx_do_wfi_sram_phys +
 153                          *pm_sram->resume_offset + 0x4;
 154
 155         m3_ipc->ops->set_resume_address(m3_ipc, (void *)resume_address);
 156 }
 157
 158 static void am33xx_pm_free_sram(void)
 159 {
 160         gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
 161         gen_pool_free(sram_pool_data, ocmcram_location_data,
 162                       sizeof(struct am33xx_pm_ro_sram_data));
 163 }
 164
 165 /*
 166  * Push the minimal suspend-resume code to SRAM
 167  */
 168 static int am33xx_pm_alloc_sram(void)
 169 {
 170         struct device_node *np;
 171         int ret = 0;
 172
 173         np = of_find_compatible_node(NULL, NULL, "ti,omap3-mpu");
 174         if (!np) {
 175                 np = of_find_compatible_node(NULL, NULL, "ti,omap4-mpu");
 176                 if (!np) {
 177                         dev_err(pm33xx_dev, "PM: %s: Unable to find device node for mpu\n",
 178                                 __func__);
 179                         return -ENODEV;
 180                 }
 181         }
 182
 183         sram_pool = of_gen_pool_get(np, "pm-sram", 0);
 184         if (!sram_pool) {
 185                 dev_err(pm33xx_dev, "PM: %s: Unable to get sram pool for ocmcram\n",
 186                         __func__);
 187                 ret = -ENODEV;
 188                 goto mpu_put_node;
 189         }
 190
 191         sram_pool_data = of_gen_pool_get(np, "pm-sram", 1);
 192         if (!sram_pool_data) {
 193                 dev_err(pm33xx_dev, "PM: %s: Unable to get sram data pool for ocmcram\n",
 194                         __func__);
 195                 ret = -ENODEV;
 196                 goto mpu_put_node;
 197         }
 198
 199         ocmcram_location = gen_pool_alloc(sram_pool, *pm_sram->do_wfi_sz);
 200         if (!ocmcram_location) {
 201                 dev_err(pm33xx_dev, "PM: %s: Unable to allocate memory from ocmcram\n",
 202                         __func__);
 203                 ret = -ENOMEM;
 204                 goto mpu_put_node;
 205         }
 206
 207         ocmcram_location_data = gen_pool_alloc(sram_pool_data,
 208                                                sizeof(struct emif_regs_amx3));
 209         if (!ocmcram_location_data) {
 210                 dev_err(pm33xx_dev, "PM: Unable to allocate memory from ocmcram\n");
 211                 gen_pool_free(sram_pool, ocmcram_location, *pm_sram->do_wfi_sz);
 212                 ret = -ENOMEM;
 213         }
 214
 215 mpu_put_node:
 216         of_node_put(np);
 217         return ret;
 218 }
 219
 220 static int am33xx_push_sram_idle(void)
 221 {
 222         struct am33xx_pm_ro_sram_data ro_sram_data;
 223         int ret;
 224         u32 table_addr, ro_data_addr;
 225         void *copy_addr;
 226
 227         ro_sram_data.amx3_pm_sram_data_virt = ocmcram_location_data;
 228         ro_sram_data.amx3_pm_sram_data_phys =
 229                 gen_pool_virt_to_phys(sram_pool_data, ocmcram_location_data);
 230
 231         /* Save physical address to calculate resume offset during pm init */
 232         am33xx_do_wfi_sram_phys = gen_pool_virt_to_phys(sram_pool,
 233                                                         ocmcram_location);
 234
 235         am33xx_do_wfi_sram = sram_exec_copy(sram_pool, (void *)ocmcram_location,
 236                                             pm_sram->do_wfi,
 237                                             *pm_sram->do_wfi_sz);
 238         if (!am33xx_do_wfi_sram) {
 239                 dev_err(pm33xx_dev,
 240                         "PM: %s: am33xx_do_wfi copy to sram failed\n",
 241                         __func__);
 242                 return -ENODEV;
 243         }
 244
 245         table_addr =
 246                 sram_suspend_address((unsigned long)pm_sram->emif_sram_table);
 247         ret = ti_emif_copy_pm_function_table(sram_pool, (void *)table_addr);
 248         if (ret) {
 249                 dev_dbg(pm33xx_dev,
 250                         "PM: %s: EMIF function copy failed\n", __func__);
 251                 return -EPROBE_DEFER;
 252         }
 253
 254         ro_data_addr =
 255                 sram_suspend_address((unsigned long)pm_sram->ro_sram_data);
 256         copy_addr = sram_exec_copy(sram_pool, (void *)ro_data_addr,
 257                                    &ro_sram_data,
 258                                    sizeof(ro_sram_data));
 259         if (!copy_addr) {
 260                 dev_err(pm33xx_dev,
 261                         "PM: %s: ro_sram_data copy to sram failed\n",
 262                         __func__);
 263                 return -ENODEV;
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int am33xx_pm_probe(struct platform_device *pdev)
 270 {
 271         struct device *dev = &pdev->dev;
 272         int ret;
 273
 274         if (!of_machine_is_compatible("ti,am33xx") &&
 275             !of_machine_is_compatible("ti,am43"))
 276                 return -ENODEV;
 277
 278         pm_ops = dev->platform_data;
 279         if (!pm_ops) {
 280                 dev_err(dev, "PM: Cannot get core PM ops!\n");
 281                 return -ENODEV;
 282         }
 283
 284         pm_sram = pm_ops->get_sram_addrs();
 285         if (!pm_sram) {
 286                 dev_err(dev, "PM: Cannot get PM asm function addresses!!\n");
 287                 return -ENODEV;
 288         }
 289
 290         pm33xx_dev = dev;
 291
 292         ret = am33xx_pm_alloc_sram();
 293         if (ret)
 294                 return ret;
 295
 296         ret = am33xx_push_sram_idle();
 297         if (ret)
 298                 goto err_free_sram;
 299
 300         m3_ipc = wkup_m3_ipc_get();
 301         if (!m3_ipc) {
 302                 dev_dbg(dev, "PM: Cannot get wkup_m3_ipc handle\n");
 303                 ret = -EPROBE_DEFER;
 304                 goto err_free_sram;
 305         }
 306
 307         am33xx_pm_set_ipc_ops();
 308
 309 #ifdef CONFIG_SUSPEND
 310         suspend_set_ops(&am33xx_pm_ops);
 311 #endif /* CONFIG_SUSPEND */
 312
 313         ret = pm_ops->init();
 314         if (ret) {
 315                 dev_err(dev, "Unable to call core pm init!\n");
 316                 ret = -ENODEV;
 317                 goto err_put_wkup_m3_ipc;
 318         }
 319
 320         return 0;
 321
 322 err_put_wkup_m3_ipc:
 323         wkup_m3_ipc_put(m3_ipc);
 324 err_free_sram:
 325         am33xx_pm_free_sram();
 326         pm33xx_dev = NULL;
 327         return ret;
 328 }
 329
 330 static int am33xx_pm_remove(struct platform_device *pdev)
 331 {
 332         suspend_set_ops(NULL);
 333         wkup_m3_ipc_put(m3_ipc);
 334         am33xx_pm_free_sram();
 335         return 0;
 336 }
 337
 338 static struct platform_driver am33xx_pm_driver = {
 339         .driver = {
 340                 .name   = "pm33xx",
 341         },
 342         .probe = am33xx_pm_probe,
 343         .remove = am33xx_pm_remove,
 344 };
 345 module_platform_driver(am33xx_pm_driver);
 346
 347 MODULE_ALIAS("platform:pm33xx");
 348 MODULE_LICENSE("GPL v2");
 349 MODULE_DESCRIPTION("am33xx power management driver");