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/of.h>
  18 #include <linux/of_address.h>
  19 #include <linux/of_irq.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/pm_domain.h>
  22 #include <linux/regulator/consumer.h>
  23 #include <linux/irqchip/arm-gic.h>
  24 #include "common.h"
  25 #include "hardware.h"
  26
  27 #define GPC_CNTR                0x000
  28 #define GPC_IMR1                0x008
  29 #define GPC_PGC_GPU_PDN         0x260
  30 #define GPC_PGC_GPU_PUPSCR      0x264
  31 #define GPC_PGC_GPU_PDNSCR      0x268
  32 #define GPC_PGC_CPU_PDN         0x2a0
  33 #define GPC_PGC_CPU_PUPSCR      0x2a4
  34 #define GPC_PGC_CPU_PDNSCR      0x2a8
  35 #define GPC_PGC_SW2ISO_SHIFT    0x8
  36 #define GPC_PGC_SW_SHIFT        0x0
  37
  38 #define IMR_NUM                 4
  39 #define GPC_MAX_IRQS            (IMR_NUM * 32)
  40
  41 #define GPU_VPU_PUP_REQ         BIT(1)
  42 #define GPU_VPU_PDN_REQ         BIT(0)
  43
  44 #define GPC_CLK_MAX             6
  45
  46 struct pu_domain {
  47         struct generic_pm_domain base;
  48         struct regulator *reg;
  49         struct clk *clk[GPC_CLK_MAX];
  50         int num_clks;
  51 };
  52
  53 static void __iomem *gpc_base;
  54 static u32 gpc_wake_irqs[IMR_NUM];
  55 static u32 gpc_saved_imrs[IMR_NUM];
  56
  57 void imx_gpc_set_arm_power_up_timing(u32 sw2iso, u32 sw)
  58 {
  59         writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
  60                 (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PUPSCR);
  61 }
  62
  63 void imx_gpc_set_arm_power_down_timing(u32 sw2iso, u32 sw)
  64 {
  65         writel_relaxed((sw2iso << GPC_PGC_SW2ISO_SHIFT) |
  66                 (sw << GPC_PGC_SW_SHIFT), gpc_base + GPC_PGC_CPU_PDNSCR);
  67 }
  68
  69 void imx_gpc_set_arm_power_in_lpm(bool power_off)
  70 {
  71         writel_relaxed(power_off, gpc_base + GPC_PGC_CPU_PDN);
  72 }
  73
  74 void imx_gpc_pre_suspend(bool arm_power_off)
  75 {
  76         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
  77         int i;
  78
  79         /* Tell GPC to power off ARM core when suspend */
  80         if (arm_power_off)
  81                 imx_gpc_set_arm_power_in_lpm(arm_power_off);
  82
  83         for (i = 0; i < IMR_NUM; i++) {
  84                 gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
  85                 writel_relaxed(~gpc_wake_irqs[i], reg_imr1 + i * 4);
  86         }
  87 }
  88
  89 void imx_gpc_post_resume(void)
  90 {
  91         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
  92         int i;
  93
  94         /* Keep ARM core powered on for other low-power modes */
  95         imx_gpc_set_arm_power_in_lpm(false);
  96
  97         for (i = 0; i < IMR_NUM; i++)
  98                 writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
  99 }
 100
 101 static int imx_gpc_irq_set_wake(struct irq_data *d, unsigned int on)
 102 {
 103         unsigned int idx = d->hwirq / 32;
 104         u32 mask;
 105
 106         mask = 1 << d->hwirq % 32;
 107         gpc_wake_irqs[idx] = on ? gpc_wake_irqs[idx] | mask :
 108                                   gpc_wake_irqs[idx] & ~mask;
 109
 110         /*
 111          * Do *not* call into the parent, as the GIC doesn't have any
 112          * wake-up facility...
 113          */
 114         return 0;
 115 }
 116
 117 void imx_gpc_mask_all(void)
 118 {
 119         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
 120         int i;
 121
 122         for (i = 0; i < IMR_NUM; i++) {
 123                 gpc_saved_imrs[i] = readl_relaxed(reg_imr1 + i * 4);
 124                 writel_relaxed(~0, reg_imr1 + i * 4);
 125         }
 126
 127 }
 128
 129 void imx_gpc_restore_all(void)
 130 {
 131         void __iomem *reg_imr1 = gpc_base + GPC_IMR1;
 132         int i;
 133
 134         for (i = 0; i < IMR_NUM; i++)
 135                 writel_relaxed(gpc_saved_imrs[i], reg_imr1 + i * 4);
 136 }
 137
 138 void imx_gpc_hwirq_unmask(unsigned int hwirq)
 139 {
 140         void __iomem *reg;
 141         u32 val;
 142
 143         reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
 144         val = readl_relaxed(reg);
 145         val &= ~(1 << hwirq % 32);
 146         writel_relaxed(val, reg);
 147 }
 148
 149 void imx_gpc_hwirq_mask(unsigned int hwirq)
 150 {
 151         void __iomem *reg;
 152         u32 val;
 153
 154         reg = gpc_base + GPC_IMR1 + hwirq / 32 * 4;
 155         val = readl_relaxed(reg);
 156         val |= 1 << (hwirq % 32);
 157         writel_relaxed(val, reg);
 158 }
 159
 160 static void imx_gpc_irq_unmask(struct irq_data *d)
 161 {
 162         imx_gpc_hwirq_unmask(d->hwirq);
 163         irq_chip_unmask_parent(d);
 164 }
 165
 166 static void imx_gpc_irq_mask(struct irq_data *d)
 167 {
 168         imx_gpc_hwirq_mask(d->hwirq);
 169         irq_chip_mask_parent(d);
 170 }
 171
 172 static struct irq_chip imx_gpc_chip = {
 173         .name                   = "GPC",
 174         .irq_eoi                = irq_chip_eoi_parent,
 175         .irq_mask               = imx_gpc_irq_mask,
 176         .irq_unmask             = imx_gpc_irq_unmask,
 177         .irq_retrigger          = irq_chip_retrigger_hierarchy,
 178         .irq_set_wake           = imx_gpc_irq_set_wake,
 179 #ifdef CONFIG_SMP
 180         .irq_set_affinity       = irq_chip_set_affinity_parent,
 181 #endif
 182 };
 183
 184 static int imx_gpc_domain_xlate(struct irq_domain *domain,
 185                                 struct device_node *controller,
 186                                 const u32 *intspec,
 187                                 unsigned int intsize,
 188                                 unsigned long *out_hwirq,
 189                                 unsigned int *out_type)
 190 {
 191         if (domain->of_node != controller)
 192                 return -EINVAL; /* Shouldn't happen, really... */
 193         if (intsize != 3)
 194                 return -EINVAL; /* Not GIC compliant */
 195         if (intspec[0] != 0)
 196                 return -EINVAL; /* No PPI should point to this domain */
 197
 198         *out_hwirq = intspec[1];
 199         *out_type = intspec[2];
 200         return 0;
 201 }
 202
 203 static int imx_gpc_domain_alloc(struct irq_domain *domain,
 204                                   unsigned int irq,
 205                                   unsigned int nr_irqs, void *data)
 206 {
 207         struct of_phandle_args *args = data;
 208         struct of_phandle_args parent_args;
 209         irq_hw_number_t hwirq;
 210         int i;
 211
 212         if (args->args_count != 3)
 213                 return -EINVAL; /* Not GIC compliant */
 214         if (args->args[0] != 0)
 215                 return -EINVAL; /* No PPI should point to this domain */
 216
 217         hwirq = args->args[1];
 218         if (hwirq >= GPC_MAX_IRQS)
 219                 return -EINVAL; /* Can't deal with this */
 220
 221         for (i = 0; i < nr_irqs; i++)
 222                 irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
 223                                               &imx_gpc_chip, NULL);
 224
 225         parent_args = *args;
 226         parent_args.np = domain->parent->of_node;
 227         return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
 228 }
 229
 230 static const struct irq_domain_ops imx_gpc_domain_ops = {
 231         .xlate  = imx_gpc_domain_xlate,
 232         .alloc  = imx_gpc_domain_alloc,
 233         .free   = irq_domain_free_irqs_common,
 234 };
 235
 236 static int __init imx_gpc_init(struct device_node *node,
 237                                struct device_node *parent)
 238 {
 239         struct irq_domain *parent_domain, *domain;
 240         int i;
 241
 242         if (!parent) {
 243                 pr_err("%s: no parent, giving up\n", node->full_name);
 244                 return -ENODEV;
 245         }
 246
 247         parent_domain = irq_find_host(parent);
 248         if (!parent_domain) {
 249                 pr_err("%s: unable to obtain parent domain\n", node->full_name);
 250                 return -ENXIO;
 251         }
 252
 253         gpc_base = of_iomap(node, 0);
 254         if (WARN_ON(!gpc_base))
 255                 return -ENOMEM;
 256
 257         domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
 258                                           node, &imx_gpc_domain_ops,
 259                                           NULL);
 260         if (!domain) {
 261                 iounmap(gpc_base);
 262                 return -ENOMEM;
 263         }
 264
 265         /* Initially mask all interrupts */
 266         for (i = 0; i < IMR_NUM; i++)
 267                 writel_relaxed(~0, gpc_base + GPC_IMR1 + i * 4);
 268
 269         return 0;
 270 }
 271
 272 /*
 273  * We cannot use the IRQCHIP_DECLARE macro that lives in
 274  * drivers/irqchip, so we're forced to roll our own. Not very nice.
 275  */
 276 OF_DECLARE_2(irqchip, imx_gpc, "fsl,imx6q-gpc", imx_gpc_init);
 277
 278 void __init imx_gpc_check_dt(void)
 279 {
 280         struct device_node *np;
 281
 282         np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpc");
 283         if (WARN_ON(!np))
 284                 return;
 285
 286         if (WARN_ON(!of_find_property(np, "interrupt-controller", NULL))) {
 287                 pr_warn("Outdated DT detected, suspend/resume will NOT work\n");
 288
 289                 /* map GPC, so that at least CPUidle and WARs keep working */
 290                 gpc_base = of_iomap(np, 0);
 291         }
 292 }
 293
 294 static void _imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 295 {
 296         int iso, iso2sw;
 297         u32 val;
 298
 299         /* Read ISO and ISO2SW power down delays */
 300         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PDNSCR);
 301         iso = val & 0x3f;
 302         iso2sw = (val >> 8) & 0x3f;
 303
 304         /* Gate off PU domain when GPU/VPU when powered down */
 305         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 306
 307         /* Request GPC to power down GPU/VPU */
 308         val = readl_relaxed(gpc_base + GPC_CNTR);
 309         val |= GPU_VPU_PDN_REQ;
 310         writel_relaxed(val, gpc_base + GPC_CNTR);
 311
 312         /* Wait ISO + ISO2SW IPG clock cycles */
 313         ndelay((iso + iso2sw) * 1000 / 66);
 314 }
 315
 316 static int imx6q_pm_pu_power_off(struct generic_pm_domain *genpd)
 317 {
 318         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 319
 320         _imx6q_pm_pu_power_off(genpd);
 321
 322         if (pu->reg)
 323                 regulator_disable(pu->reg);
 324
 325         return 0;
 326 }
 327
 328 static int imx6q_pm_pu_power_on(struct generic_pm_domain *genpd)
 329 {
 330         struct pu_domain *pu = container_of(genpd, struct pu_domain, base);
 331         int i, ret, sw, sw2iso;
 332         u32 val;
 333
 334         if (pu->reg)
 335                 ret = regulator_enable(pu->reg);
 336         if (pu->reg && ret) {
 337                 pr_err("%s: failed to enable regulator: %d\n", __func__, ret);
 338                 return ret;
 339         }
 340
 341         /* Enable reset clocks for all devices in the PU domain */
 342         for (i = 0; i < pu->num_clks; i++)
 343                 clk_prepare_enable(pu->clk[i]);
 344
 345         /* Gate off PU domain when GPU/VPU when powered down */
 346         writel_relaxed(0x1, gpc_base + GPC_PGC_GPU_PDN);
 347
 348         /* Read ISO and ISO2SW power down delays */
 349         val = readl_relaxed(gpc_base + GPC_PGC_GPU_PUPSCR);
 350         sw = val & 0x3f;
 351         sw2iso = (val >> 8) & 0x3f;
 352
 353         /* Request GPC to power up GPU/VPU */
 354         val = readl_relaxed(gpc_base + GPC_CNTR);
 355         val |= GPU_VPU_PUP_REQ;
 356         writel_relaxed(val, gpc_base + GPC_CNTR);
 357
 358         /* Wait ISO + ISO2SW IPG clock cycles */
 359         ndelay((sw + sw2iso) * 1000 / 66);
 360
 361         /* Disable reset clocks for all devices in the PU domain */
 362         for (i = 0; i < pu->num_clks; i++)
 363                 clk_disable_unprepare(pu->clk[i]);
 364
 365         return 0;
 366 }
 367
 368 static struct generic_pm_domain imx6q_arm_domain = {
 369         .name = "ARM",
 370 };
 371
 372 static struct pu_domain imx6q_pu_domain = {
 373         .base = {
 374                 .name = "PU",
 375                 .power_off = imx6q_pm_pu_power_off,
 376                 .power_on = imx6q_pm_pu_power_on,
 377                 .power_off_latency_ns = 25000,
 378                 .power_on_latency_ns = 2000000,
 379         },
 380 };
 381
 382 static struct generic_pm_domain imx6sl_display_domain = {
 383         .name = "DISPLAY",
 384 };
 385
 386 static struct generic_pm_domain *imx_gpc_domains[] = {
 387         &imx6q_arm_domain,
 388         &imx6q_pu_domain.base,
 389         &imx6sl_display_domain,
 390 };
 391
 392 static struct genpd_onecell_data imx_gpc_onecell_data = {
 393         .domains = imx_gpc_domains,
 394         .num_domains = ARRAY_SIZE(imx_gpc_domains),
 395 };
 396
 397 static int imx_gpc_genpd_init(struct device *dev, struct regulator *pu_reg)
 398 {
 399         struct clk *clk;
 400         int i;
 401
 402         imx6q_pu_domain.reg = pu_reg;
 403
 404         for (i = 0; ; i++) {
 405                 clk = of_clk_get(dev->of_node, i);
 406                 if (IS_ERR(clk))
 407                         break;
 408                 if (i >= GPC_CLK_MAX) {
 409                         dev_err(dev, "more than %d clocks\n", GPC_CLK_MAX);
 410                         goto clk_err;
 411                 }
 412                 imx6q_pu_domain.clk[i] = clk;
 413         }
 414         imx6q_pu_domain.num_clks = i;
 415
 416         /* Enable power always in case bootloader disabled it. */
 417         imx6q_pm_pu_power_on(&imx6q_pu_domain.base);
 418
 419         if (!IS_ENABLED(CONFIG_PM_GENERIC_DOMAINS))
 420                 return 0;
 421
 422         pm_genpd_init(&imx6q_pu_domain.base, NULL, false);
 423         return of_genpd_add_provider_onecell(dev->of_node,
 424                                              &imx_gpc_onecell_data);
 425
 426 clk_err:
 427         while (i--)
 428                 clk_put(imx6q_pu_domain.clk[i]);
 429         return -EINVAL;
 430 }
 431
 432 static int imx_gpc_probe(struct platform_device *pdev)
 433 {
 434         struct regulator *pu_reg;
 435         int ret;
 436
 437         /* bail out if DT too old and doesn't provide the necessary info */
 438         if (!of_property_read_bool(pdev->dev.of_node, "#power-domain-cells"))
 439                 return 0;
 440
 441         pu_reg = devm_regulator_get_optional(&pdev->dev, "pu");
 442         if (PTR_ERR(pu_reg) == -ENODEV)
 443                 pu_reg = NULL;
 444         if (IS_ERR(pu_reg)) {
 445                 ret = PTR_ERR(pu_reg);
 446                 dev_err(&pdev->dev, "failed to get pu regulator: %d\n", ret);
 447                 return ret;
 448         }
 449
 450         return imx_gpc_genpd_init(&pdev->dev, pu_reg);
 451 }
 452
 453 static const struct of_device_id imx_gpc_dt_ids[] = {
 454         { .compatible = "fsl,imx6q-gpc" },
 455         { .compatible = "fsl,imx6sl-gpc" },
 456         { }
 457 };
 458
 459 static struct platform_driver imx_gpc_driver = {
 460         .driver = {
 461                 .name = "imx-gpc",
 462                 .of_match_table = imx_gpc_dt_ids,
 463         },
 464         .probe = imx_gpc_probe,
 465 };
 466
 467 static int __init imx_pgc_init(void)
 468 {
 469         return platform_driver_register(&imx_gpc_driver);
 470 }
 471 subsys_initcall(imx_pgc_init);