arch/arm/mach-imx/gpc.c

   1 /*
   2  * Copyright 2011-2013 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/clk.h>
  14 #include <linux/delay.h>
  15 #include <linux/io.h>
  16 #include <linux/irq.h>
  17 #include <linux/irqchip.h>
  18 #include <linux/of.h>
  19 #include <linux/of_address.h>
  20 #include <linux/of_irq.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm_domain.h>
  23 #include <linux/regulator/consumer.h>
  24 #include <linux/irqchip/arm-gic.h>
  25 #include "common.h"
  26 #include "hardware.h"
  27
  28 #define GPC_CNTR                0x000
  29 #define GPC_IMR1                0x008
  30 #define GPC_PGC_GPU_PDN         0x260
  31 #define GPC_PGC_GPU_PUPSCR      0x264
  32 #define GPC_PGC_GPU_PDNSCR      0x268
  33 #define GPC_PGC_CPU_PDN         0x2a0
  34 #define GPC_PGC_CPU_PUPSCR      0x2a4
  35 #define GPC_PGC_CPU_PDNSCR      0x2a8
  36 #define GPC_PGC_SW2ISO_SHIFT    0x8
  37 #define GPC_PGC_SW_SHIFT        0x0
  38
  39 #define IMR_NUM                 4
  40 #define GPC_MAX_IRQS            (IMR_NUM * 32)
  41
  42 #define GPU_VPU_PUP_REQ         BIT(1)
  43 #define GPU_VPU_PDN_REQ         BIT(0)
  44
  45 #define GPC_CLK_MAX             6
  46
  47 struct pu_domain {
  48         struct generic_pm_domain base;
  49         struct regulator *reg;
  50         struct clk *clk[GPC_CLK_MAX];
  51         int num_clks;
  52 };
  53
  54 static void __iomem *gpc_base;
  55 static u32 gpc_wake_irqs[IMR_NUM];
  56 static u32 gpc_saved_imrs[IMR_NUM];
  57
  58 void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
  59 {
  60         writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
  61                 (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
  62 }
  63
  64 void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
  65 {
  66         writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
  67                 (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
  68 }
  69
  70 void imx_gpc_set_arm_power_in_lpm(bool power_off)
  71 {
  72         writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
  73 }
  74
  75 void imx_gpc_pre_suspend(bool arm_power_off)
  76 {
  77         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
  78         int i;
  79
  80         /* Tell GPC to power off ARM core when suspend */
  81         if (arm_power_off)
  82                 imx_gpc_set_arm_power_in_lpm(arm_power_off);
  83
  84         for (i = 0; i < IMR_NUM; i++) {
  85                 gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
  86                 writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
  87         }
  88 }
  89
  90 void imx_gpc_post_resume(void)
  91 {
  92         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
  93         int i;
  94
  95         /* Keep ARM core powered on for other low-power modes */
  96         imx_gpc_set_arm_power_in_lpm(false);
  97
  98         for (i = 0; i < IMR_NUM; i++)
  99                 writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
 100 }
 101
 102 static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
 103 {
 104         unsigned int idx = d->hwirq / 32;
 105         u32 mask;
 106
 107         mask = 1 << d->hwirq % 32;
 108         gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask :
 109                                   gpc_wake_irqs[idx] & ~mask;
 110
 111         /*
 112          * Do *not* call into the parent, as the GIC doesn't have any
 113          * wake-up facility...
 114          */
 115         return 0;
 116 }
 117
 118 void imx_gpc_mask_all(void)
 119 {
 120         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
 121         int i;
 122
 123         for (i = 0; i < IMR_NUM; i++) {
 124                 gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
 125                 writel_relaxed(~0, reg_imr1 + i * 4);
 126         }
 127
 128 }
 129
 130 void imx_gpc_restore_all(void)
 131 {
 132         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
 133         int i;
 134
 135         for (i = 0; i < IMR_NUM; i++)
 136                 writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
 137 }
 138
 139 void imx_gpc_hwirq_unmask(unsigned int hwirq)
 140 {
 141         void __iomem *reg;
 142         u32 val;
 143
 144         reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
 145         val = readl_relaxed(reg);
 146         val &= ~(1 << hwirq % 32);
 147         writel_relaxed(val, reg);
 148 }
 149
 150 void imx_gpc_hwirq_mask(unsigned int hwirq)
 151 {
 152         void __iomem *reg;
 153         u32 val;
 154
 155         reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
 156         val = readl_relaxed(reg);
 157         val |= 1 << (hwirq % 32);
 158         writel_relaxed(val, reg);
 159 }
 160
 161 static void imx_gpc_irq_unmask(struct irq_data *d)
 162 {
 163         imx_gpc_hwirq_unmask(d->hwirq);
 164         irq_chip_unmask_parent(d);
 165 }
 166
 167 static void imx_gpc_irq_mask(struct irq_data *d)
 168 {
 169         imx_gpc_hwirq_mask(d->hwirq);
 170         irq_chip_mask_parent(d);
 171 }
 172
 173 static struct irq_chip imx_gpc_chip = {
 174         .name                   = "GPC",
 175         .irq_eoi                = irq_chip_eoi_parent,
 176         .irq_mask               = imx_gpc_irq_mask,
 177         .irq_unmask             = imx_gpc_irq_unmask,
 178         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 179         .irq_set_wake           = imx_gpc_irq_set_wake,
 180         .irq_set_type           = irq_chip_set_type_parent,
 181 #ifdef CONFIG_SMP
 182         .irq_set_affinity       = irq_chip_set_affinity_parent,
 183 #endif
 184 };
 185
 186 static int imx_gpc_domain_translate(struct irq_domain *d,
 187                                     struct irq_fwspec *fwspec,
 188                                     unsigned long *hwirq,
 189                                     unsigned int *type)
 190 {
 191         if (is_of_node(fwspec->fwnode)) {
 192                 if (fwspec->param_count != 3)
 193                         return -EINVAL;
 194
 195                 /* No PPI should point to this domain */
 196                 if (fwspec->param[0] != 0)
 197                         return -EINVAL;
 198
 199                 *hwirq = fwspec->param[1];
 200                 *type = fwspec->param[2];
 201                 return 0;
 202         }
 203
 204         return -EINVAL;
 205 }
 206
 207 static int imx_gpc_domain_alloc(struct irq_domain *domain,
 208                                   unsigned int irq,
 209                                   unsigned int nr_irqs, void *data)
 210 {
 211         struct irq_fwspec *fwspec = data;
 212         struct irq_fwspec parent_fwspec;
 213         irq_hw_number_t hwirq;
 214         int i;
 215
 216         if (fwspec->param_count != 3)
 217                 return -EINVAL; /* Not GIC compliant */
 218         if (fwspec->param[0] != 0)
 219                 return -EINVAL; /* No PPI should point to this domain */
 220
 221         hwirq = fwspec->param[1];
 222         if (hwirq >= GPC_MAX_IRQS)
 223                 return -EINVAL; /* Can't deal with this */
 224
 225         for (i = 0; i < nr_irqs; i++)
 226                 irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
 227                                               &imx_gpc_chip, NULL);
 228
 229         parent_fwspec = *fwspec;
 230         parent_fwspec.fwnode = domain->parent->fwnode;
 231         return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
 232                                             &parent_fwspec);
 233 }
 234
 235 static const struct irq_domain_ops imx_gpc_domain_ops = {
 236         .translate      = imx_gpc_domain_translate,
 237         .alloc          = imx_gpc_domain_alloc,
 238         .free           = irq_domain_free_irqs_common,
 239 };
 240
 241 static int __init imx_gpc_init(struct device_node *node,
 242                                struct device_node *parent)
 243 {
 244         struct irq_domain *parent_domain, *domain;
 245         int i;
 246
 247         if (!parent) {
 248                 pr_err("%s: no parent, giving up\n", node->full_name);
 249                 return -ENODEV;
 250         }
 251
 252         parent_domain = irq_find_host(parent);
 253         if (!parent_domain) {
 254                 pr_err("%s: unable to obtain parent domain\n", node->full_name);
 255                 return -ENXIO;
 256         }
 257
 258         gpc_base = of_iomap(node, 0);
 259         if (WARN_ON(!gpc_base))
 260                 return -ENOMEM;
 261
 262         domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
 263                                           node, &imx_gpc_domain_ops,
 264                                           NULL);
 265         if (!domain) {
 266                 iounmap(gpc_base);
 267                 return -ENOMEM;
 268         }
 269
 270         /* Initially mask all interrupts */
 271         for (i = 0; i < IMR_NUM; i++)
 272                 writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
 273
 274         /*
 275          * Clear the OF_POPULATED flag set in of_irq_init so that
 276          * later the GPC power domain driver will not be skipped.
 277          */
 278         of_node_clear_flag(node, OF_POPULATED);
 279
 280         return 0;
 281 }
 282 IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);
 283
 284 void __init imx_gpc_check_dt(void)
 285 {
 286         struct device_node *np;
 287
 288         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
 289         if (WARN_ON(!np))
 290                 return;
 291
 292         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 293                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 294
 295                 /* map GPC, so that at least CPUidle and WARs keep working */
 296                 gpc_base = of_iomap(np, 0);
 297         }
 298 }
 299
 300 static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 301 {
 302         int iso, iso2sw;
 303         u32 val;
 304
 305         /* Read ISO and ISO2SW power down delays */
 306         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
 307         iso = val & 0x3f;
 308         iso2sw = (val >> 8) & 0x3f;
 309
 310         /* Gate off PU domain when GPU/VPU when powered down */
 311         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 312
 313         /* Request GPC to power down GPU/VPU */
 314         val = readl_relaxed(gpc_base + GPC_CNTR);
 315         val |= GPU_VPU_PDN_REQ;
 316         writel_relaxed(val, gpc_base + GPC_CNTR);
 317
 318         /* Wait ISO + ISO2SW IPG clock cycles */
 319         ndelay((iso + iso2sw) * 1000 / 66);
 320 }
 321
 322 static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 323 {
 324         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 325
 326         _imx6q_pm_pu_power_off(genpd);
 327
 328         if (pu->reg)
 329                 regulator_disable(pu->reg);
 330
 331         return 0;
 332 }
 333
 334 static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
 335 {
 336         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 337         int i, ret, sw, sw2iso;
 338         u32 val;
 339
 340         if (pu->reg)
 341                 ret = regulator_enable(pu->reg);
 342         if (pu->reg && ret) {
 343                 pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
 344                 return ret;
 345         }
 346
 347         /* Enable reset clocks for all devices in the PU domain */
 348         for (i = 0; i < pu->num_clks; i++)
 349                 clk_prepare_enable(pu->clk[i]);
 350
 351         /* Gate off PU domain when GPU/VPU when powered down */
 352         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 353
 354         /* Read ISO and ISO2SW power down delays */
 355         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
 356         sw = val & 0x3f;
 357         sw2iso = (val >> 8) & 0x3f;
 358
 359         /* Request GPC to power up GPU/VPU */
 360         val = readl_relaxed(gpc_base + GPC_CNTR);
 361         val |= GPU_VPU_PUP_REQ;
 362         writel_relaxed(val, gpc_base + GPC_CNTR);
 363
 364         /* Wait ISO + ISO2SW IPG clock cycles */
 365         ndelay((sw + sw2iso) * 1000 / 66);
 366
 367         /* Disable reset clocks for all devices in the PU domain */
 368         for (i = 0; i < pu->num_clks; i++)
 369                 clk_disable_unprepare(pu->clk[i]);
 370
 371         return 0;
 372 }
 373
 374 static struct generic_pm_domain imx6q_arm_domain = {
 375         .name = "ARM",
 376 };
 377
 378 static struct pu_domain imx6q_pu_domain = {
 379         .base = {
 380                 .name = "PU",
 381                 .power_off = imx6q_pm_pu_power_off,
 382                 .power_on = imx6q_pm_pu_power_on,
 383                 .states = {
 384                         [0] = {
 385                                 .power_off_latency_ns = 25000,
 386                                 .power_on_latency_ns = 2000000,
 387                         },
 388                 },
 389                 .state_count = 1,
 390         },
 391 };
 392
 393 static struct generic_pm_domain imx6sl_display_domain = {
 394         .name = "DISPLAY",
 395 };
 396
 397 static struct generic_pm_domain *imx_gpc_domains[] = {
 398         &imx6q_arm_domain,
 399         &imx6q_pu_domain.base,
 400         &imx6sl_display_domain,
 401 };
 402
 403 static struct genpd_onecell_data imx_gpc_onecell_data = {
 404         .domains = imx_gpc_domains,
 405         .num_domains = ARRAY_SIZE(imx_gpc_domains),
 406 };
 407
 408 static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
 409 {
 410         struct clk *clk;
 411         int i;
 412
 413         imx6q_pu_domain.reg = pu_reg;
 414
 415         for (i = 0; ; i++) {
 416                 clk = of_clk_get(dev->of_node, i);
 417                 if (IS_ERR(clk))
 418                         break;
 419                 if (i >= GPC_CLK_MAX) {
 420                         dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
 421                         goto clk_err;
 422                 }
 423                 imx6q_pu_domain.clk[i] = clk;
 424         }
 425         imx6q_pu_domain.num_clks = i;
 426
 427         /* Enable power always in case bootloader disabled it. */
 428         imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
 429
 430         if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
 431                 return 0;
 432
 433         pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
 434         return of_genpd_add_provider_onecell(dev->of_node,
 435                                              &imx_gpc_onecell_data);
 436
 437 clk_err:
 438         while (i--)
 439                 clk_put(imx6q_pu_domain.clk[i]);
 440         return -EINVAL;
 441 }
 442
 443 static int imx_gpc_probe(struct platform_device *pdev)
 444 {
 445         struct regulator *pu_reg;
 446         int ret;
 447
 448         /* bail out if DT too old and doesn't provide the necessary info */
 449         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
 450                 return 0;
 451
 452         pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
 453         if (PTR_ERR(pu_reg) == -ENODEV)
 454                 pu_reg = NULL;
 455         if (IS_ERR(pu_reg)) {
 456                 ret = PTR_ERR(pu_reg);
 457                 dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
 458                 return ret;
 459         }
 460
 461         return imx_gpc_genpd_init(&pdev->dev, pu_reg);
 462 }
 463
 464 static const struct of_device_id imx_gpc_dt_ids[] = {
 465         { .compatible = "fsl,imx6q-gpc" },
 466         { .compatible = "fsl,imx6sl-gpc" },
 467         { }
 468 };
 469
 470 static struct platform_driver imx_gpc_driver = {
 471         .driver = {
 472                 .name = "imx-gpc",
 473                 .of_match_table = imx_gpc_dt_ids,
 474         },
 475         .probe = imx_gpc_probe,
 476 };
 477
 478 static int __init imx_pgc_init(void)
 479 {
 480         return platform_driver_register(&imx_gpc_driver);
 481 }
 482 subsys_initcall(imx_pgc_init);