arch/arm/mach-imx/pm-imx5.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
   4  */
   5 #include <linux/suspend.h>
   6 #include <linux/clk.h>
   7 #include <linux/io.h>
   8 #include <linux/err.h>
   9 #include <linux/export.h>
  10
  11 #include <linux/genalloc.h>
  12 #include <linux/of.h>
  13 #include <linux/of_address.h>
  14 #include <linux/of_platform.h>
  15
  16 #include <asm/cacheflush.h>
  17 #include <asm/fncpy.h>
  18 #include <asm/system_misc.h>
  19 #include <asm/tlbflush.h>
  20
  21 #include "common.h"
  22 #include "cpuidle.h"
  23 #include "hardware.h"
  24
  25 #define MXC_CCM_CLPCR                   0x54
  26 #define MXC_CCM_CLPCR_LPM_OFFSET        0
  27 #define MXC_CCM_CLPCR_LPM_MASK          0x3
  28 #define MXC_CCM_CLPCR_STBY_COUNT_OFFSET 9
  29 #define MXC_CCM_CLPCR_VSTBY             (0x1 << 8)
  30 #define MXC_CCM_CLPCR_SBYOS             (0x1 << 6)
  31
  32 #define MXC_CORTEXA8_PLAT_LPC           0xc
  33 #define MXC_CORTEXA8_PLAT_LPC_DSM       (1 << 0)
  34 #define MXC_CORTEXA8_PLAT_LPC_DBG_DSM   (1 << 1)
  35
  36 #define MXC_SRPG_NEON_SRPGCR            0x280
  37 #define MXC_SRPG_ARM_SRPGCR             0x2a0
  38 #define MXC_SRPG_EMPGC0_SRPGCR          0x2c0
  39 #define MXC_SRPG_EMPGC1_SRPGCR          0x2d0
  40
  41 #define MXC_SRPGCR_PCR                  1
  42
  43 /*
  44  * The WAIT_UNCLOCKED_POWER_OFF state only requires <= 500ns to exit.
  45  * This is also the lowest power state possible without affecting
  46  * non-cpu parts of the system.  For these reasons, imx5 should default
  47  * to always using this state for cpu idling.  The PM_SUSPEND_STANDBY also
  48  * uses this state and needs to take no action when registers remain confgiured
  49  * for this state.
  50  */
  51 #define IMX5_DEFAULT_CPU_IDLE_STATE WAIT_UNCLOCKED_POWER_OFF
  52
  53 struct imx5_suspend_io_state {
  54         u32     offset;
  55         u32     clear;
  56         u32     set;
  57         u32     saved_value;
  58 };
  59
  60 struct imx5_pm_data {
  61         phys_addr_t ccm_addr;
  62         phys_addr_t cortex_addr;
  63         phys_addr_t gpc_addr;
  64         phys_addr_t m4if_addr;
  65         phys_addr_t iomuxc_addr;
  66         void (*suspend_asm)(void __iomem *ocram_vbase);
  67         const u32 *suspend_asm_sz;
  68         const struct imx5_suspend_io_state *suspend_io_config;
  69         int suspend_io_count;
  70 };
  71
  72 static const struct imx5_suspend_io_state imx53_suspend_io_config[] = {
  73 #define MX53_DSE_HIGHZ_MASK (0x7 << 19)
  74         {.offset = 0x584, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM0 */
  75         {.offset = 0x594, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM1 */
  76         {.offset = 0x560, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM2 */
  77         {.offset = 0x554, .clear = MX53_DSE_HIGHZ_MASK}, /* DQM3 */
  78         {.offset = 0x574, .clear = MX53_DSE_HIGHZ_MASK}, /* CAS */
  79         {.offset = 0x588, .clear = MX53_DSE_HIGHZ_MASK}, /* RAS */
  80         {.offset = 0x578, .clear = MX53_DSE_HIGHZ_MASK}, /* SDCLK_0 */
  81         {.offset = 0x570, .clear = MX53_DSE_HIGHZ_MASK}, /* SDCLK_1 */
  82
  83         {.offset = 0x580, .clear = MX53_DSE_HIGHZ_MASK}, /* SDODT0 */
  84         {.offset = 0x564, .clear = MX53_DSE_HIGHZ_MASK}, /* SDODT1 */
  85         {.offset = 0x57c, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS0 */
  86         {.offset = 0x590, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS1 */
  87         {.offset = 0x568, .clear = MX53_DSE_HIGHZ_MASK}, /* SDQS2 */
  88         {.offset = 0x558, .clear = MX53_DSE_HIGHZ_MASK}, /* SDSQ3 */
  89         {.offset = 0x6f0, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_ADDS */
  90         {.offset = 0x718, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_BODS */
  91         {.offset = 0x71c, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B1DS */
  92         {.offset = 0x728, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B2DS */
  93         {.offset = 0x72c, .clear = MX53_DSE_HIGHZ_MASK}, /* GRP_B3DS */
  94
  95         /* Controls the CKE signal which is required to leave self refresh */
  96         {.offset = 0x720, .clear = MX53_DSE_HIGHZ_MASK, .set = 1 << 19}, /* CTLDS */
  97 };
  98
  99 static const struct imx5_pm_data imx51_pm_data __initconst = {
 100         .ccm_addr = 0x73fd4000,
 101         .cortex_addr = 0x83fa0000,
 102         .gpc_addr = 0x73fd8000,
 103 };
 104
 105 static const struct imx5_pm_data imx53_pm_data __initconst = {
 106         .ccm_addr = 0x53fd4000,
 107         .cortex_addr = 0x63fa0000,
 108         .gpc_addr = 0x53fd8000,
 109         .m4if_addr = 0x63fd8000,
 110         .iomuxc_addr = 0x53fa8000,
 111         .suspend_asm = &imx53_suspend,
 112         .suspend_asm_sz = &imx53_suspend_sz,
 113         .suspend_io_config = imx53_suspend_io_config,
 114         .suspend_io_count = ARRAY_SIZE(imx53_suspend_io_config),
 115 };
 116
 117 #define MX5_MAX_SUSPEND_IOSTATE ARRAY_SIZE(imx53_suspend_io_config)
 118
 119 /*
 120  * This structure is for passing necessary data for low level ocram
 121  * suspend code(arch/arm/mach-imx/suspend-imx53.S), if this struct
 122  * definition is changed, the offset definition in that file
 123  * must be also changed accordingly otherwise, the suspend to ocram
 124  * function will be broken!
 125  */
 126 struct imx5_cpu_suspend_info {
 127         void __iomem    *m4if_base;
 128         void __iomem    *iomuxc_base;
 129         u32             io_count;
 130         struct imx5_suspend_io_state io_state[MX5_MAX_SUSPEND_IOSTATE];
 131 } __aligned(8);
 132
 133 static void __iomem *ccm_base;
 134 static void __iomem *cortex_base;
 135 static void __iomem *gpc_base;
 136 static void __iomem *suspend_ocram_base;
 137 static void (*imx5_suspend_in_ocram_fn)(void __iomem *ocram_vbase);
 138
 139 /*
 140  * set cpu low power mode before WFI instruction. This function is called
 141  * mx5 because it can be used for mx51, and mx53.
 142  */
 143 static void mx5_cpu_lp_set(enum mxc_cpu_pwr_mode mode)
 144 {
 145         u32 plat_lpc, arm_srpgcr, ccm_clpcr;
 146         u32 empgc0, empgc1;
 147         int stop_mode = 0;
 148
 149         /* always allow platform to issue a deep sleep mode request */
 150         plat_lpc = imx_readl(cortex_base + MXC_CORTEXA8_PLAT_LPC) &
 151             ~(MXC_CORTEXA8_PLAT_LPC_DSM);
 152         ccm_clpcr = imx_readl(ccm_base + MXC_CCM_CLPCR) &
 153                     ~(MXC_CCM_CLPCR_LPM_MASK);
 154         arm_srpgcr = imx_readl(gpc_base + MXC_SRPG_ARM_SRPGCR) &
 155                      ~(MXC_SRPGCR_PCR);
 156         empgc0 = imx_readl(gpc_base + MXC_SRPG_EMPGC0_SRPGCR) &
 157                  ~(MXC_SRPGCR_PCR);
 158         empgc1 = imx_readl(gpc_base + MXC_SRPG_EMPGC1_SRPGCR) &
 159                  ~(MXC_SRPGCR_PCR);
 160
 161         switch (mode) {
 162         case WAIT_CLOCKED:
 163                 break;
 164         case WAIT_UNCLOCKED:
 165                 ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
 166                 break;
 167         case WAIT_UNCLOCKED_POWER_OFF:
 168         case STOP_POWER_OFF:
 169                 plat_lpc |= MXC_CORTEXA8_PLAT_LPC_DSM
 170                             | MXC_CORTEXA8_PLAT_LPC_DBG_DSM;
 171                 if (mode == WAIT_UNCLOCKED_POWER_OFF) {
 172                         ccm_clpcr |= 0x1 << MXC_CCM_CLPCR_LPM_OFFSET;
 173                         ccm_clpcr &= ~MXC_CCM_CLPCR_VSTBY;
 174                         ccm_clpcr &= ~MXC_CCM_CLPCR_SBYOS;
 175                         stop_mode = 0;
 176                 } else {
 177                         ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
 178                         ccm_clpcr |= 0x3 << MXC_CCM_CLPCR_STBY_COUNT_OFFSET;
 179                         ccm_clpcr |= MXC_CCM_CLPCR_VSTBY;
 180                         ccm_clpcr |= MXC_CCM_CLPCR_SBYOS;
 181                         stop_mode = 1;
 182                 }
 183                 arm_srpgcr |= MXC_SRPGCR_PCR;
 184                 break;
 185         case STOP_POWER_ON:
 186                 ccm_clpcr |= 0x2 << MXC_CCM_CLPCR_LPM_OFFSET;
 187                 break;
 188         default:
 189                 printk(KERN_WARNING "UNKNOWN cpu power mode: %d\n", mode);
 190                 return;
 191         }
 192
 193         imx_writel(plat_lpc, cortex_base + MXC_CORTEXA8_PLAT_LPC);
 194         imx_writel(ccm_clpcr, ccm_base + MXC_CCM_CLPCR);
 195         imx_writel(arm_srpgcr, gpc_base + MXC_SRPG_ARM_SRPGCR);
 196         imx_writel(arm_srpgcr, gpc_base + MXC_SRPG_NEON_SRPGCR);
 197
 198         if (stop_mode) {
 199                 empgc0 |= MXC_SRPGCR_PCR;
 200                 empgc1 |= MXC_SRPGCR_PCR;
 201
 202                 imx_writel(empgc0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
 203                 imx_writel(empgc1, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
 204         }
 205 }
 206
 207 static int mx5_suspend_enter(suspend_state_t state)
 208 {
 209         switch (state) {
 210         case PM_SUSPEND_MEM:
 211                 mx5_cpu_lp_set(STOP_POWER_OFF);
 212                 break;
 213         case PM_SUSPEND_STANDBY:
 214                 /* DEFAULT_IDLE_STATE already configured */
 215                 break;
 216         default:
 217                 return -EINVAL;
 218         }
 219
 220         if (state == PM_SUSPEND_MEM) {
 221                 local_flush_tlb_all();
 222                 flush_cache_all();
 223
 224                 /*clear the EMPGC0/1 bits */
 225                 imx_writel(0, gpc_base + MXC_SRPG_EMPGC0_SRPGCR);
 226                 imx_writel(0, gpc_base + MXC_SRPG_EMPGC1_SRPGCR);
 227
 228                 if (imx5_suspend_in_ocram_fn)
 229                         imx5_suspend_in_ocram_fn(suspend_ocram_base);
 230                 else
 231                         cpu_do_idle();
 232
 233         } else {
 234                 cpu_do_idle();
 235         }
 236
 237         /* return registers to default idle state */
 238         mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
 239         return 0;
 240 }
 241
 242 static int mx5_pm_valid(suspend_state_t state)
 243 {
 244         return (state > PM_SUSPEND_ON && state <= PM_SUSPEND_MAX);
 245 }
 246
 247 static const struct platform_suspend_ops mx5_suspend_ops = {
 248         .valid = mx5_pm_valid,
 249         .enter = mx5_suspend_enter,
 250 };
 251
 252 static inline int imx5_cpu_do_idle(void)
 253 {
 254         int ret = tzic_enable_wake();
 255
 256         if (likely(!ret))
 257                 cpu_do_idle();
 258
 259         return ret;
 260 }
 261
 262 static void imx5_pm_idle(void)
 263 {
 264         imx5_cpu_do_idle();
 265 }
 266
 267 static int __init imx_suspend_alloc_ocram(
 268                                 size_t size,
 269                                 void __iomem **virt_out,
 270                                 phys_addr_t *phys_out)
 271 {
 272         struct device_node *node;
 273         struct platform_device *pdev;
 274         struct gen_pool *ocram_pool;
 275         unsigned long ocram_base;
 276         void __iomem *virt;
 277         phys_addr_t phys;
 278         int ret = 0;
 279
 280         /* Copied from imx6: TODO factorize */
 281         node = of_find_compatible_node(NULL, NULL, "mmio-sram");
 282         if (!node) {
 283                 pr_warn("%s: failed to find ocram node!\n", __func__);
 284                 return -ENODEV;
 285         }
 286
 287         pdev = of_find_device_by_node(node);
 288         if (!pdev) {
 289                 pr_warn("%s: failed to find ocram device!\n", __func__);
 290                 ret = -ENODEV;
 291                 goto put_node;
 292         }
 293
 294         ocram_pool = gen_pool_get(&pdev->dev, NULL);
 295         if (!ocram_pool) {
 296                 pr_warn("%s: ocram pool unavailable!\n", __func__);
 297                 ret = -ENODEV;
 298                 goto put_node;
 299         }
 300
 301         ocram_base = gen_pool_alloc(ocram_pool, size);
 302         if (!ocram_base) {
 303                 pr_warn("%s: unable to alloc ocram!\n", __func__);
 304                 ret = -ENOMEM;
 305                 goto put_node;
 306         }
 307
 308         phys = gen_pool_virt_to_phys(ocram_pool, ocram_base);
 309         virt = __arm_ioremap_exec(phys, size, false);
 310         if (phys_out)
 311                 *phys_out = phys;
 312         if (virt_out)
 313                 *virt_out = virt;
 314
 315 put_node:
 316         of_node_put(node);
 317
 318         return ret;
 319 }
 320
 321 static int __init imx5_suspend_init(const struct imx5_pm_data *soc_data)
 322 {
 323         struct imx5_cpu_suspend_info *suspend_info;
 324         int ret;
 325         /* Need this to avoid compile error due to const typeof in fncpy.h */
 326         void (*suspend_asm)(void __iomem *) = soc_data->suspend_asm;
 327
 328         if (!suspend_asm)
 329                 return 0;
 330
 331         if (!soc_data->suspend_asm_sz || !*soc_data->suspend_asm_sz)
 332                 return -EINVAL;
 333
 334         ret = imx_suspend_alloc_ocram(
 335                 *soc_data->suspend_asm_sz + sizeof(*suspend_info),
 336                 &suspend_ocram_base, NULL);
 337         if (ret)
 338                 return ret;
 339
 340         suspend_info = suspend_ocram_base;
 341
 342         suspend_info->io_count = soc_data->suspend_io_count;
 343         memcpy(suspend_info->io_state, soc_data->suspend_io_config,
 344                sizeof(*suspend_info->io_state) * soc_data->suspend_io_count);
 345
 346         suspend_info->m4if_base = ioremap(soc_data->m4if_addr, SZ_16K);
 347         if (!suspend_info->m4if_base) {
 348                 ret = -ENOMEM;
 349                 goto failed_map_m4if;
 350         }
 351
 352         suspend_info->iomuxc_base = ioremap(soc_data->iomuxc_addr, SZ_16K);
 353         if (!suspend_info->iomuxc_base) {
 354                 ret = -ENOMEM;
 355                 goto failed_map_iomuxc;
 356         }
 357
 358         imx5_suspend_in_ocram_fn = fncpy(
 359                 suspend_ocram_base + sizeof(*suspend_info),
 360                 suspend_asm,
 361                 *soc_data->suspend_asm_sz);
 362
 363         return 0;
 364
 365 failed_map_iomuxc:
 366         iounmap(suspend_info->m4if_base);
 367
 368 failed_map_m4if:
 369         return ret;
 370 }
 371
 372 static int __init imx5_pm_common_init(const struct imx5_pm_data *data)
 373 {
 374         int ret;
 375         struct clk *gpc_dvfs_clk = clk_get(NULL, "gpc_dvfs");
 376
 377         if (IS_ERR(gpc_dvfs_clk))
 378                 return PTR_ERR(gpc_dvfs_clk);
 379
 380         ret = clk_prepare_enable(gpc_dvfs_clk);
 381         if (ret)
 382                 return ret;
 383
 384         arm_pm_idle = imx5_pm_idle;
 385
 386         ccm_base = ioremap(data->ccm_addr, SZ_16K);
 387         cortex_base = ioremap(data->cortex_addr, SZ_16K);
 388         gpc_base = ioremap(data->gpc_addr, SZ_16K);
 389         WARN_ON(!ccm_base || !cortex_base || !gpc_base);
 390
 391         /* Set the registers to the default cpu idle state. */
 392         mx5_cpu_lp_set(IMX5_DEFAULT_CPU_IDLE_STATE);
 393
 394         ret = imx5_cpuidle_init();
 395         if (ret)
 396                 pr_warn("%s: cpuidle init failed %d\n", __func__, ret);
 397
 398         ret = imx5_suspend_init(data);
 399         if (ret)
 400                 pr_warn("%s: No DDR LPM support with suspend %d!\n",
 401                         __func__, ret);
 402
 403         suspend_set_ops(&mx5_suspend_ops);
 404
 405         return 0;
 406 }
 407
 408 void __init imx51_pm_init(void)
 409 {
 410         if (IS_ENABLED(CONFIG_SOC_IMX51))
 411                 imx5_pm_common_init(&imx51_pm_data);
 412 }
 413
 414 void __init imx53_pm_init(void)
 415 {
 416         if (IS_ENABLED(CONFIG_SOC_IMX53))
 417                 imx5_pm_common_init(&imx53_pm_data);
 418 }