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 #ifdef CONFIG_SMP
 181         .irq_set_affinity       = irq_chip_set_affinity_parent,
 182 #endif
 183 };
 184
 185 static int imx_gpc_domain_translate(struct irq_domain *d,
 186                                     struct irq_fwspec *fwspec,
 187                                     unsigned long *hwirq,
 188                                     unsigned int *type)
 189 {
 190         if (is_of_node(fwspec->fwnode)) {
 191                 if (fwspec->param_count != 3)
 192                         return -EINVAL;
 193
 194                 /* No PPI should point to this domain */
 195                 if (fwspec->param[0] != 0)
 196                         return -EINVAL;
 197
 198                 *hwirq = fwspec->param[1];
 199                 *type = fwspec->param[2];
 200                 return 0;
 201         }
 202
 203         return -EINVAL;
 204 }
 205
 206 static int imx_gpc_domain_alloc(struct irq_domain *domain,
 207                                   unsigned int irq,
 208                                   unsigned int nr_irqs, void *data)
 209 {
 210         struct irq_fwspec *fwspec = data;
 211         struct irq_fwspec parent_fwspec;
 212         irq_hw_number_t hwirq;
 213         int i;
 214
 215         if (fwspec->param_count != 3)
 216                 return -EINVAL; /* Not GIC compliant */
 217         if (fwspec->param[0] != 0)
 218                 return -EINVAL; /* No PPI should point to this domain */
 219
 220         hwirq = fwspec->param[1];
 221         if (hwirq >= GPC_MAX_IRQS)
 222                 return -EINVAL; /* Can't deal with this */
 223
 224         for (i = 0; i < nr_irqs; i++)
 225                 irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
 226                                               &imx_gpc_chip, NULL);
 227
 228         parent_fwspec = *fwspec;
 229         parent_fwspec.fwnode = domain->parent->fwnode;
 230         return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs,
 231                                             &parent_fwspec);
 232 }
 233
 234 static const struct irq_domain_ops imx_gpc_domain_ops = {
 235         .translate      = imx_gpc_domain_translate,
 236         .alloc          = imx_gpc_domain_alloc,
 237         .free           = irq_domain_free_irqs_common,
 238 };
 239
 240 static int __init imx_gpc_init(struct device_node *node,
 241                                struct device_node *parent)
 242 {
 243         struct irq_domain *parent_domain, *domain;
 244         int i;
 245
 246         if (!parent) {
 247                 pr_err("%s: no parent, giving up\n", node->full_name);
 248                 return -ENODEV;
 249         }
 250
 251         parent_domain = irq_find_host(parent);
 252         if (!parent_domain) {
 253                 pr_err("%s: unable to obtain parent domain\n", node->full_name);
 254                 return -ENXIO;
 255         }
 256
 257         gpc_base = of_iomap(node, 0);
 258         if (WARN_ON(!gpc_base))
 259                 return -ENOMEM;
 260
 261         domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
 262                                           node, &imx_gpc_domain_ops,
 263                                           NULL);
 264         if (!domain) {
 265                 iounmap(gpc_base);
 266                 return -ENOMEM;
 267         }
 268
 269         /* Initially mask all interrupts */
 270         for (i = 0; i < IMR_NUM; i++)
 271                 writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
 272
 273         return 0;
 274 }
 275 IRQCHIP_DECLARE(imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);
 276
 277 void __init imx_gpc_check_dt(void)
 278 {
 279         struct device_node *np;
 280
 281         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
 282         if (WARN_ON(!np))
 283                 return;
 284
 285         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 286                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 287
 288                 /* map GPC, so that at least CPUidle and WARs keep working */
 289                 gpc_base = of_iomap(np, 0);
 290         }
 291 }
 292
 293 static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 294 {
 295         int iso, iso2sw;
 296         u32 val;
 297
 298         /* Read ISO and ISO2SW power down delays */
 299         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
 300         iso = val & 0x3f;
 301         iso2sw = (val >> 8) & 0x3f;
 302
 303         /* Gate off PU domain when GPU/VPU when powered down */
 304         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 305
 306         /* Request GPC to power down GPU/VPU */
 307         val = readl_relaxed(gpc_base + GPC_CNTR);
 308         val |= GPU_VPU_PDN_REQ;
 309         writel_relaxed(val, gpc_base + GPC_CNTR);
 310
 311         /* Wait ISO + ISO2SW IPG clock cycles */
 312         ndelay((iso + iso2sw) * 1000 / 66);
 313 }
 314
 315 static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 316 {
 317         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 318
 319         _imx6q_pm_pu_power_off(genpd);
 320
 321         if (pu->reg)
 322                 regulator_disable(pu->reg);
 323
 324         return 0;
 325 }
 326
 327 static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
 328 {
 329         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 330         int i, ret, sw, sw2iso;
 331         u32 val;
 332
 333         if (pu->reg)
 334                 ret = regulator_enable(pu->reg);
 335         if (pu->reg && ret) {
 336                 pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
 337                 return ret;
 338         }
 339
 340         /* Enable reset clocks for all devices in the PU domain */
 341         for (i = 0; i < pu->num_clks; i++)
 342                 clk_prepare_enable(pu->clk[i]);
 343
 344         /* Gate off PU domain when GPU/VPU when powered down */
 345         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 346
 347         /* Read ISO and ISO2SW power down delays */
 348         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
 349         sw = val & 0x3f;
 350         sw2iso = (val >> 8) & 0x3f;
 351
 352         /* Request GPC to power up GPU/VPU */
 353         val = readl_relaxed(gpc_base + GPC_CNTR);
 354         val |= GPU_VPU_PUP_REQ;
 355         writel_relaxed(val, gpc_base + GPC_CNTR);
 356
 357         /* Wait ISO + ISO2SW IPG clock cycles */
 358         ndelay((sw + sw2iso) * 1000 / 66);
 359
 360         /* Disable reset clocks for all devices in the PU domain */
 361         for (i = 0; i < pu->num_clks; i++)
 362                 clk_disable_unprepare(pu->clk[i]);
 363
 364         return 0;
 365 }
 366
 367 static struct generic_pm_domain imx6q_arm_domain = {
 368         .name = "ARM",
 369 };
 370
 371 static struct pu_domain imx6q_pu_domain = {
 372         .base = {
 373                 .name = "PU",
 374                 .power_off = imx6q_pm_pu_power_off,
 375                 .power_on = imx6q_pm_pu_power_on,
 376                 .power_off_latency_ns = 25000,
 377                 .power_on_latency_ns = 2000000,
 378         },
 379 };
 380
 381 static struct generic_pm_domain imx6sl_display_domain = {
 382         .name = "DISPLAY",
 383 };
 384
 385 static struct generic_pm_domain *imx_gpc_domains[] = {
 386         &imx6q_arm_domain,
 387         &imx6q_pu_domain.base,
 388         &imx6sl_display_domain,
 389 };
 390
 391 static struct genpd_onecell_data imx_gpc_onecell_data = {
 392         .domains = imx_gpc_domains,
 393         .num_domains = ARRAY_SIZE(imx_gpc_domains),
 394 };
 395
 396 static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
 397 {
 398         struct clk *clk;
 399         int i;
 400
 401         imx6q_pu_domain.reg = pu_reg;
 402
 403         for (i = 0; ; i++) {
 404                 clk = of_clk_get(dev->of_node, i);
 405                 if (IS_ERR(clk))
 406                         break;
 407                 if (i >= GPC_CLK_MAX) {
 408                         dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
 409                         goto clk_err;
 410                 }
 411                 imx6q_pu_domain.clk[i] = clk;
 412         }
 413         imx6q_pu_domain.num_clks = i;
 414
 415         /* Enable power always in case bootloader disabled it. */
 416         imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
 417
 418         if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
 419                 return 0;
 420
 421         pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
 422         return of_genpd_add_provider_onecell(dev->of_node,
 423                                              &imx_gpc_onecell_data);
 424
 425 clk_err:
 426         while (i--)
 427                 clk_put(imx6q_pu_domain.clk[i]);
 428         return -EINVAL;
 429 }
 430
 431 static int imx_gpc_probe(struct platform_device *pdev)
 432 {
 433         struct regulator *pu_reg;
 434         int ret;
 435
 436         /* bail out if DT too old and doesn't provide the necessary info */
 437         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
 438                 return 0;
 439
 440         pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
 441         if (PTR_ERR(pu_reg) == -ENODEV)
 442                 pu_reg = NULL;
 443         if (IS_ERR(pu_reg)) {
 444                 ret = PTR_ERR(pu_reg);
 445                 dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
 446                 return ret;
 447         }
 448
 449         return imx_gpc_genpd_init(&pdev->dev, pu_reg);
 450 }
 451
 452 static const struct of_device_id imx_gpc_dt_ids[] = {
 453         { .compatible = "fsl,imx6q-gpc" },
 454         { .compatible = "fsl,imx6sl-gpc" },
 455         { }
 456 };
 457
 458 static struct platform_driver imx_gpc_driver = {
 459         .driver = {
 460                 .name = "imx-gpc",
 461                 .of_match_table = imx_gpc_dt_ids,
 462         },
 463         .probe = imx_gpc_probe,
 464 };
 465
 466 static int __init imx_pgc_init(void)
 467 {
 468         return platform_driver_register(&imx_gpc_driver);
 469 }
 470 subsys_initcall(imx_pgc_init);