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 return 0; 275 } 276 IRQCHIP_DECLARE(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); 472