arch/arm/mach-imx/pm-imx6.c

   1 /*
   2  * Copyright 2011-2014 Freescale Semiconductor, Inc.
   3  * Copyright 2011 Linaro Ltd.
   4  *
   5  * The code contained herein is licensed under the GNU General Public
   6  * License. You may obtain a copy of the GNU General Public License
   7  * Version 2 or later at the following locations:
   8  *
   9  * http://www.opensource.org/licenses/gpl-license.html
  10  * http://www.gnu.org/copyleft/gpl.html
  11  */
  12
  13 #include <linux/delay.h>
  14 #include <linux/init.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17 #include <linux/genalloc.h>
  18 #include <linux/mfd/syscon.h>
  19 #include <linux/mfd/syscon/imx6q-iomuxc-gpr.h>
  20 #include <linux/of.h>
  21 #include <linux/of_address.h>
  22 #include <linux/of_platform.h>
  23 #include <linux/regmap.h>
  24 #include <linux/suspend.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/fncpy.h>
  27 #include <asm/proc-fns.h>
  28 #include <asm/suspend.h>
  29 #include <asm/tlb.h>
  30
  31 #include "common.h"
  32 #include "hardware.h"
  33
  34 #define CCR                             0x0
  35 #define BM_CCR_WB_COUNT                 (0x7 << 16)
  36 #define BM_CCR_RBC_BYPASS_COUNT         (0x3f << 21)
  37 #define BM_CCR_RBC_EN                   (0x1 << 27)
  38
  39 #define CLPCR                           0x54
  40 #define BP_CLPCR_LPM                    0
  41 #define BM_CLPCR_LPM                    (0x3 << 0)
  42 #define BM_CLPCR_BYPASS_PMIC_READY      (0x1 << 2)
  43 #define BM_CLPCR_ARM_CLK_DIS_ON_LPM     (0x1 << 5)
  44 #define BM_CLPCR_SBYOS                  (0x1 << 6)
  45 #define BM_CLPCR_DIS_REF_OSC            (0x1 << 7)
  46 #define BM_CLPCR_VSTBY                  (0x1 << 8)
  47 #define BP_CLPCR_STBY_COUNT             9
  48 #define BM_CLPCR_STBY_COUNT             (0x3 << 9)
  49 #define BM_CLPCR_COSC_PWRDOWN           (0x1 << 11)
  50 #define BM_CLPCR_WB_PER_AT_LPM          (0x1 << 16)
  51 #define BM_CLPCR_WB_CORE_AT_LPM         (0x1 << 17)
  52 #define BM_CLPCR_BYP_MMDC_CH0_LPM_HS    (0x1 << 19)
  53 #define BM_CLPCR_BYP_MMDC_CH1_LPM_HS    (0x1 << 21)
  54 #define BM_CLPCR_MASK_CORE0_WFI         (0x1 << 22)
  55 #define BM_CLPCR_MASK_CORE1_WFI         (0x1 << 23)
  56 #define BM_CLPCR_MASK_CORE2_WFI         (0x1 << 24)
  57 #define BM_CLPCR_MASK_CORE3_WFI         (0x1 << 25)
  58 #define BM_CLPCR_MASK_SCU_IDLE          (0x1 << 26)
  59 #define BM_CLPCR_MASK_L2CC_IDLE         (0x1 << 27)
  60
  61 #define CGPR                            0x64
  62 #define BM_CGPR_INT_MEM_CLK_LPM         (0x1 << 17)
  63
  64 #define MX6Q_SUSPEND_OCRAM_SIZE         0x1000
  65 #define MX6_MAX_MMDC_IO_NUM             33
  66
  67 static void __iomem *ccm_base;
  68 static void __iomem *suspend_ocram_base;
  69 static void (*imx6_suspend_in_ocram_fn)(void __iomem *ocram_vbase);
  70
  71 /*
  72  * suspend ocram space layout:
  73  * ======================== high address ======================
  74  *                              .
  75  *                              .
  76  *                              .
  77  *                              ^
  78  *                              ^
  79  *                              ^
  80  *                      imx6_suspend code
  81  *              PM_INFO structure(imx6_cpu_pm_info)
  82  * ======================== low address =======================
  83  */
  84
  85 struct imx6_pm_base {
  86         phys_addr_t pbase;
  87         void __iomem *vbase;
  88 };
  89
  90 struct imx6_pm_socdata {
  91         u32 cpu_type;
  92         const char *mmdc_compat;
  93         const char *src_compat;
  94         const char *iomuxc_compat;
  95         const char *gpc_compat;
  96         const u32 mmdc_io_num;
  97         const u32 *mmdc_io_offset;
  98 };
  99
 100 static const u32 imx6q_mmdc_io_offset[] __initconst = {
 101         0x5ac, 0x5b4, 0x528, 0x520, /* DQM0 ~ DQM3 */
 102         0x514, 0x510, 0x5bc, 0x5c4, /* DQM4 ~ DQM7 */
 103         0x56c, 0x578, 0x588, 0x594, /* CAS, RAS, SDCLK_0, SDCLK_1 */
 104         0x5a8, 0x5b0, 0x524, 0x51c, /* SDQS0 ~ SDQS3 */
 105         0x518, 0x50c, 0x5b8, 0x5c0, /* SDQS4 ~ SDQS7 */
 106         0x784, 0x788, 0x794, 0x79c, /* GPR_B0DS ~ GPR_B3DS */
 107         0x7a0, 0x7a4, 0x7a8, 0x748, /* GPR_B4DS ~ GPR_B7DS */
 108         0x59c, 0x5a0, 0x750, 0x774, /* SODT0, SODT1, MODE_CTL, MODE */
 109         0x74c,                      /* GPR_ADDS */
 110 };
 111
 112 static const u32 imx6dl_mmdc_io_offset[] __initconst = {
 113         0x470, 0x474, 0x478, 0x47c, /* DQM0 ~ DQM3 */
 114         0x480, 0x484, 0x488, 0x48c, /* DQM4 ~ DQM7 */
 115         0x464, 0x490, 0x4ac, 0x4b0, /* CAS, RAS, SDCLK_0, SDCLK_1 */
 116         0x4bc, 0x4c0, 0x4c4, 0x4c8, /* DRAM_SDQS0 ~ DRAM_SDQS3 */
 117         0x4cc, 0x4d0, 0x4d4, 0x4d8, /* DRAM_SDQS4 ~ DRAM_SDQS7 */
 118         0x764, 0x770, 0x778, 0x77c, /* GPR_B0DS ~ GPR_B3DS */
 119         0x780, 0x784, 0x78c, 0x748, /* GPR_B4DS ~ GPR_B7DS */
 120         0x4b4, 0x4b8, 0x750, 0x760, /* SODT0, SODT1, MODE_CTL, MODE */
 121         0x74c,                      /* GPR_ADDS */
 122 };
 123
 124 static const u32 imx6sl_mmdc_io_offset[] __initconst = {
 125         0x30c, 0x310, 0x314, 0x318, /* DQM0 ~ DQM3 */
 126         0x5c4, 0x5cc, 0x5d4, 0x5d8, /* GPR_B0DS ~ GPR_B3DS */
 127         0x300, 0x31c, 0x338, 0x5ac, /* CAS, RAS, SDCLK_0, GPR_ADDS */
 128         0x33c, 0x340, 0x5b0, 0x5c0, /* SODT0, SODT1, MODE_CTL, MODE */
 129         0x330, 0x334, 0x320,        /* SDCKE0, SDCKE1, RESET */
 130 };
 131
 132 static const struct imx6_pm_socdata imx6q_pm_data __initconst = {
 133         .cpu_type = MXC_CPU_IMX6Q,
 134         .mmdc_compat = "fsl,imx6q-mmdc",
 135         .src_compat = "fsl,imx6q-src",
 136         .iomuxc_compat = "fsl,imx6q-iomuxc",
 137         .gpc_compat = "fsl,imx6q-gpc",
 138         .mmdc_io_num = ARRAY_SIZE(imx6q_mmdc_io_offset),
 139         .mmdc_io_offset = imx6q_mmdc_io_offset,
 140 };
 141
 142 static const struct imx6_pm_socdata imx6dl_pm_data __initconst = {
 143         .cpu_type = MXC_CPU_IMX6DL,
 144         .mmdc_compat = "fsl,imx6q-mmdc",
 145         .src_compat = "fsl,imx6q-src",
 146         .iomuxc_compat = "fsl,imx6dl-iomuxc",
 147         .gpc_compat = "fsl,imx6q-gpc",
 148         .mmdc_io_num = ARRAY_SIZE(imx6dl_mmdc_io_offset),
 149         .mmdc_io_offset = imx6dl_mmdc_io_offset,
 150 };
 151
 152 static const struct imx6_pm_socdata imx6sl_pm_data __initconst = {
 153         .cpu_type = MXC_CPU_IMX6SL,
 154         .mmdc_compat = "fsl,imx6sl-mmdc",
 155         .src_compat = "fsl,imx6sl-src",
 156         .iomuxc_compat = "fsl,imx6sl-iomuxc",
 157         .gpc_compat = "fsl,imx6sl-gpc",
 158         .mmdc_io_num = ARRAY_SIZE(imx6sl_mmdc_io_offset),
 159         .mmdc_io_offset = imx6sl_mmdc_io_offset,
 160 };
 161
 162 /*
 163  * This structure is for passing necessary data for low level ocram
 164  * suspend code(arch/arm/mach-imx/suspend-imx6.S), if this struct
 165  * definition is changed, the offset definition in
 166  * arch/arm/mach-imx/suspend-imx6.S must be also changed accordingly,
 167  * otherwise, the suspend to ocram function will be broken!
 168  */
 169 struct imx6_cpu_pm_info {
 170         phys_addr_t pbase; /* The physical address of pm_info. */
 171         phys_addr_t resume_addr; /* The physical resume address for asm code */
 172         u32 cpu_type;
 173         u32 pm_info_size; /* Size of pm_info. */
 174         struct imx6_pm_base mmdc_base;
 175         struct imx6_pm_base src_base;
 176         struct imx6_pm_base iomuxc_base;
 177         struct imx6_pm_base ccm_base;
 178         struct imx6_pm_base gpc_base;
 179         struct imx6_pm_base l2_base;
 180         u32 mmdc_io_num; /* Number of MMDC IOs which need saved/restored. */
 181         u32 mmdc_io_val[MX6_MAX_MMDC_IO_NUM][2]; /* To save offset and value */
 182 } __aligned(8);
 183
 184 void imx6q_set_int_mem_clk_lpm(void)
 185 {
 186         u32 val = readl_relaxed(ccm_base + CGPR);
 187
 188         val |= BM_CGPR_INT_MEM_CLK_LPM;
 189         writel_relaxed(val, ccm_base + CGPR);
 190 }
 191
 192 static void imx6q_enable_rbc(bool enable)
 193 {
 194         u32 val;
 195
 196         /*
 197          * need to mask all interrupts in GPC before
 198          * operating RBC configurations
 199          */
 200         imx_gpc_mask_all();
 201
 202         /* configure RBC enable bit */
 203         val = readl_relaxed(ccm_base + CCR);
 204         val &= ~BM_CCR_RBC_EN;
 205         val |= enable ? BM_CCR_RBC_EN : 0;
 206         writel_relaxed(val, ccm_base + CCR);
 207
 208         /* configure RBC count */
 209         val = readl_relaxed(ccm_base + CCR);
 210         val &= ~BM_CCR_RBC_BYPASS_COUNT;
 211         val |= enable ? BM_CCR_RBC_BYPASS_COUNT : 0;
 212         writel(val, ccm_base + CCR);
 213
 214         /*
 215          * need to delay at least 2 cycles of CKIL(32K)
 216          * due to hardware design requirement, which is
 217          * ~61us, here we use 65us for safe
 218          */
 219         udelay(65);
 220
 221         /* restore GPC interrupt mask settings */
 222         imx_gpc_restore_all();
 223 }
 224
 225 static void imx6q_enable_wb(bool enable)
 226 {
 227         u32 val;
 228
 229         /* configure well bias enable bit */
 230         val = readl_relaxed(ccm_base + CLPCR);
 231         val &= ~BM_CLPCR_WB_PER_AT_LPM;
 232         val |= enable ? BM_CLPCR_WB_PER_AT_LPM : 0;
 233         writel_relaxed(val, ccm_base + CLPCR);
 234
 235         /* configure well bias count */
 236         val = readl_relaxed(ccm_base + CCR);
 237         val &= ~BM_CCR_WB_COUNT;
 238         val |= enable ? BM_CCR_WB_COUNT : 0;
 239         writel_relaxed(val, ccm_base + CCR);
 240 }
 241
 242 int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode)
 243 {
 244         struct irq_data *iomuxc_irq_data = irq_get_irq_data(32);
 245         u32 val = readl_relaxed(ccm_base + CLPCR);
 246
 247         val &= ~BM_CLPCR_LPM;
 248         switch (mode) {
 249         case WAIT_CLOCKED:
 250                 break;
 251         case WAIT_UNCLOCKED:
 252                 val |= 0x1 << BP_CLPCR_LPM;
 253                 val |= BM_CLPCR_ARM_CLK_DIS_ON_LPM;
 254                 break;
 255         case STOP_POWER_ON:
 256                 val |= 0x2 << BP_CLPCR_LPM;
 257                 break;
 258         case WAIT_UNCLOCKED_POWER_OFF:
 259                 val |= 0x1 << BP_CLPCR_LPM;
 260                 val &= ~BM_CLPCR_VSTBY;
 261                 val &= ~BM_CLPCR_SBYOS;
 262                 break;
 263         case STOP_POWER_OFF:
 264                 val |= 0x2 << BP_CLPCR_LPM;
 265                 val |= 0x3 << BP_CLPCR_STBY_COUNT;
 266                 val |= BM_CLPCR_VSTBY;
 267                 val |= BM_CLPCR_SBYOS;
 268                 if (cpu_is_imx6sl()) {
 269                         val |= BM_CLPCR_BYPASS_PMIC_READY;
 270                         val |= BM_CLPCR_BYP_MMDC_CH0_LPM_HS;
 271                 } else {
 272                         val |= BM_CLPCR_BYP_MMDC_CH1_LPM_HS;
 273                 }
 274                 break;
 275         default:
 276                 return -EINVAL;
 277         }
 278
 279         /*
 280          * ERR007265: CCM: When improper low-power sequence is used,
 281          * the SoC enters low power mode before the ARM core executes WFI.
 282          *
 283          * Software workaround:
 284          * 1) Software should trigger IRQ #32 (IOMUX) to be always pending
 285          *    by setting IOMUX_GPR1_GINT.
 286          * 2) Software should then unmask IRQ #32 in GPC before setting CCM
 287          *    Low-Power mode.
 288          * 3) Software should mask IRQ #32 right after CCM Low-Power mode
 289          *    is set (set bits 0-1 of CCM_CLPCR).
 290          */
 291         imx_gpc_irq_unmask(iomuxc_irq_data);
 292         writel_relaxed(val, ccm_base + CLPCR);
 293         imx_gpc_irq_mask(iomuxc_irq_data);
 294
 295         return 0;
 296 }
 297
 298 static int imx6q_suspend_finish(unsigned long val)
 299 {
 300         if (!imx6_suspend_in_ocram_fn) {
 301                 cpu_do_idle();
 302         } else {
 303                 /*
 304                  * call low level suspend function in ocram,
 305                  * as we need to float DDR IO.
 306                  */
 307                 local_flush_tlb_all();
 308                 imx6_suspend_in_ocram_fn(suspend_ocram_base);
 309         }
 310
 311         return 0;
 312 }
 313
 314 static int imx6q_pm_enter(suspend_state_t state)
 315 {
 316         switch (state) {
 317         case PM_SUSPEND_MEM:
 318                 imx6q_set_lpm(STOP_POWER_OFF);
 319                 imx6q_enable_wb(true);
 320                 /*
 321                  * For suspend into ocram, asm code already take care of
 322                  * RBC setting, so we do NOT need to do that here.
 323                  */
 324                 if (!imx6_suspend_in_ocram_fn)
 325                         imx6q_enable_rbc(true);
 326                 imx_gpc_pre_suspend();
 327                 imx_anatop_pre_suspend();
 328                 imx_set_cpu_jump(0, v7_cpu_resume);
 329                 /* Zzz ... */
 330                 cpu_suspend(0, imx6q_suspend_finish);
 331                 if (cpu_is_imx6q() || cpu_is_imx6dl())
 332                         imx_smp_prepare();
 333                 imx_anatop_post_resume();
 334                 imx_gpc_post_resume();
 335                 imx6q_enable_rbc(false);
 336                 imx6q_enable_wb(false);
 337                 imx6q_set_lpm(WAIT_CLOCKED);
 338                 break;
 339         default:
 340                 return -EINVAL;
 341         }
 342
 343         return 0;
 344 }
 345
 346 static const struct platform_suspend_ops imx6q_pm_ops = {
 347         .enter = imx6q_pm_enter,
 348         .valid = suspend_valid_only_mem,
 349 };
 350
 351 void __init imx6q_pm_set_ccm_base(void __iomem *base)
 352 {
 353         ccm_base = base;
 354 }
 355
 356 static int __init imx6_pm_get_base(struct imx6_pm_base *base,
 357                                 const char *compat)
 358 {
 359         struct device_node *node;
 360         struct resource res;
 361         int ret = 0;
 362
 363         node = of_find_compatible_node(NULL, NULL, compat);
 364         if (!node) {
 365                 ret = -ENODEV;
 366                 goto out;
 367         }
 368
 369         ret = of_address_to_resource(node, 0, &res);
 370         if (ret)
 371                 goto put_node;
 372
 373         base->pbase = res.start;
 374         base->vbase = ioremap(res.start, resource_size(&res));
 375         if (!base->vbase)
 376                 ret = -ENOMEM;
 377
 378 put_node:
 379         of_node_put(node);
 380 out:
 381         return ret;
 382 }
 383
 384 static int __init imx6q_suspend_init(const struct imx6_pm_socdata *socdata)
 385 {
 386         phys_addr_t ocram_pbase;
 387         struct device_node *node;
 388         struct platform_device *pdev;
 389         struct imx6_cpu_pm_info *pm_info;
 390         struct gen_pool *ocram_pool;
 391         unsigned long ocram_base;
 392         int i, ret = 0;
 393         const u32 *mmdc_offset_array;
 394
 395         suspend_set_ops(&imx6q_pm_ops);
 396
 397         if (!socdata) {
 398                 pr_warn("%s: invalid argument!\n", __func__);
 399                 return -EINVAL;
 400         }
 401
 402         node = of_find_compatible_node(NULL, NULL, "mmio-sram");
 403         if (!node) {
 404                 pr_warn("%s: failed to find ocram node!\n", __func__);
 405                 return -ENODEV;
 406         }
 407
 408         pdev = of_find_device_by_node(node);
 409         if (!pdev) {
 410                 pr_warn("%s: failed to find ocram device!\n", __func__);
 411                 ret = -ENODEV;
 412                 goto put_node;
 413         }
 414
 415         ocram_pool = dev_get_gen_pool(&pdev->dev);
 416         if (!ocram_pool) {
 417                 pr_warn("%s: ocram pool unavailable!\n", __func__);
 418                 ret = -ENODEV;
 419                 goto put_node;
 420         }
 421
 422         ocram_base = gen_pool_alloc(ocram_pool, MX6Q_SUSPEND_OCRAM_SIZE);
 423         if (!ocram_base) {
 424                 pr_warn("%s: unable to alloc ocram!\n", __func__);
 425                 ret = -ENOMEM;
 426                 goto put_node;
 427         }
 428
 429         ocram_pbase = gen_pool_virt_to_phys(ocram_pool, ocram_base);
 430
 431         suspend_ocram_base = __arm_ioremap_exec(ocram_pbase,
 432                 MX6Q_SUSPEND_OCRAM_SIZE, false);
 433
 434         pm_info = suspend_ocram_base;
 435         pm_info->pbase = ocram_pbase;
 436         pm_info->resume_addr = virt_to_phys(v7_cpu_resume);
 437         pm_info->pm_info_size = sizeof(*pm_info);
 438
 439         /*
 440          * ccm physical address is not used by asm code currently,
 441          * so get ccm virtual address directly, as we already have
 442          * it from ccm driver.
 443          */
 444         pm_info->ccm_base.vbase = ccm_base;
 445
 446         ret = imx6_pm_get_base(&pm_info->mmdc_base, socdata->mmdc_compat);
 447         if (ret) {
 448                 pr_warn("%s: failed to get mmdc base %d!\n", __func__, ret);
 449                 goto put_node;
 450         }
 451
 452         ret = imx6_pm_get_base(&pm_info->src_base, socdata->src_compat);
 453         if (ret) {
 454                 pr_warn("%s: failed to get src base %d!\n", __func__, ret);
 455                 goto src_map_failed;
 456         }
 457
 458         ret = imx6_pm_get_base(&pm_info->iomuxc_base, socdata->iomuxc_compat);
 459         if (ret) {
 460                 pr_warn("%s: failed to get iomuxc base %d!\n", __func__, ret);
 461                 goto iomuxc_map_failed;
 462         }
 463
 464         ret = imx6_pm_get_base(&pm_info->gpc_base, socdata->gpc_compat);
 465         if (ret) {
 466                 pr_warn("%s: failed to get gpc base %d!\n", __func__, ret);
 467                 goto gpc_map_failed;
 468         }
 469
 470         ret = imx6_pm_get_base(&pm_info->l2_base, "arm,pl310-cache");
 471         if (ret) {
 472                 pr_warn("%s: failed to get pl310-cache base %d!\n",
 473                         __func__, ret);
 474                 goto pl310_cache_map_failed;
 475         }
 476
 477         pm_info->cpu_type = socdata->cpu_type;
 478         pm_info->mmdc_io_num = socdata->mmdc_io_num;
 479         mmdc_offset_array = socdata->mmdc_io_offset;
 480
 481         for (i = 0; i < pm_info->mmdc_io_num; i++) {
 482                 pm_info->mmdc_io_val[i][0] =
 483                         mmdc_offset_array[i];
 484                 pm_info->mmdc_io_val[i][1] =
 485                         readl_relaxed(pm_info->iomuxc_base.vbase +
 486                         mmdc_offset_array[i]);
 487         }
 488
 489         imx6_suspend_in_ocram_fn = fncpy(
 490                 suspend_ocram_base + sizeof(*pm_info),
 491                 &imx6_suspend,
 492                 MX6Q_SUSPEND_OCRAM_SIZE - sizeof(*pm_info));
 493
 494         goto put_node;
 495
 496 pl310_cache_map_failed:
 497         iounmap(&pm_info->gpc_base.vbase);
 498 gpc_map_failed:
 499         iounmap(&pm_info->iomuxc_base.vbase);
 500 iomuxc_map_failed:
 501         iounmap(&pm_info->src_base.vbase);
 502 src_map_failed:
 503         iounmap(&pm_info->mmdc_base.vbase);
 504 put_node:
 505         of_node_put(node);
 506
 507         return ret;
 508 }
 509
 510 static void __init imx6_pm_common_init(const struct imx6_pm_socdata
 511                                         *socdata)
 512 {
 513         struct regmap *gpr;
 514         int ret;
 515
 516         WARN_ON(!ccm_base);
 517
 518         if (IS_ENABLED(CONFIG_SUSPEND)) {
 519                 ret = imx6q_suspend_init(socdata);
 520                 if (ret)
 521                         pr_warn("%s: No DDR LPM support with suspend %d!\n",
 522                                 __func__, ret);
 523         }
 524
 525         /*
 526          * This is for SW workaround step #1 of ERR007265, see comments
 527          * in imx6q_set_lpm for details of this errata.
 528          * Force IOMUXC irq pending, so that the interrupt to GPC can be
 529          * used to deassert dsm_request signal when the signal gets
 530          * asserted unexpectedly.
 531          */
 532         gpr = syscon_regmap_lookup_by_compatible("fsl,imx6q-iomuxc-gpr");
 533         if (!IS_ERR(gpr))
 534                 regmap_update_bits(gpr, IOMUXC_GPR1, IMX6Q_GPR1_GINT,
 535                                    IMX6Q_GPR1_GINT);
 536 }
 537
 538 void __init imx6q_pm_init(void)
 539 {
 540         imx6_pm_common_init(&imx6q_pm_data);
 541 }
 542
 543 void __init imx6dl_pm_init(void)
 544 {
 545         imx6_pm_common_init(&imx6dl_pm_data);
 546 }
 547
 548 void __init imx6sl_pm_init(void)
 549 {
 550         imx6_pm_common_init(&imx6sl_pm_data);
 551 }