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