1 // SPDX-License-Identifier: GPL-2.0+ 2 // 3 // MXC GPIO support. (c) 2008 Daniel Mack <daniel@caiaq.de> 4 // Copyright 2008 Juergen Beisert, kernel@pengutronix.de 5 // 6 // Based on code from Freescale Semiconductor, 7 // Authors: Daniel Mack, Juergen Beisert. 8 // Copyright (C) 2004-2010 Freescale Semiconductor, Inc. All Rights Reserved. 9 10 #include <linux/clk.h> 11 #include <linux/err.h> 12 #include <linux/init.h> 13 #include <linux/interrupt.h> 14 #include <linux/io.h> 15 #include <linux/irq.h> 16 #include <linux/irqdomain.h> 17 #include <linux/irqchip/chained_irq.h> 18 #include <linux/module.h> 19 #include <linux/platform_device.h> 20 #include <linux/pm_runtime.h> 21 #include <linux/slab.h> 22 #include <linux/spinlock.h> 23 #include <linux/syscore_ops.h> 24 #include <linux/gpio/driver.h> 25 #include <linux/of.h> 26 #include <linux/bug.h> 27 28 #define IMX_SCU_WAKEUP_OFF 0 29 #define IMX_SCU_WAKEUP_LOW_LVL 4 30 #define IMX_SCU_WAKEUP_FALL_EDGE 5 31 #define IMX_SCU_WAKEUP_RISE_EDGE 6 32 #define IMX_SCU_WAKEUP_HIGH_LVL 7 33 34 /* device type dependent stuff */ 35 struct mxc_gpio_hwdata { 36 unsigned dr_reg; 37 unsigned gdir_reg; 38 unsigned psr_reg; 39 unsigned icr1_reg; 40 unsigned icr2_reg; 41 unsigned imr_reg; 42 unsigned isr_reg; 43 int edge_sel_reg; 44 unsigned low_level; 45 unsigned high_level; 46 unsigned rise_edge; 47 unsigned fall_edge; 48 }; 49 50 struct mxc_gpio_reg_saved { 51 u32 icr1; 52 u32 icr2; 53 u32 imr; 54 u32 gdir; 55 u32 edge_sel; 56 u32 dr; 57 }; 58 59 struct mxc_gpio_port { 60 struct list_head node; 61 void __iomem *base; 62 struct clk *clk; 63 int irq; 64 int irq_high; 65 void (*mx_irq_handler)(struct irq_desc *desc); 66 struct irq_domain *domain; 67 struct gpio_chip gc; 68 struct device *dev; 69 u32 both_edges; 70 struct mxc_gpio_reg_saved gpio_saved_reg; 71 bool power_off; 72 u32 wakeup_pads; 73 bool is_pad_wakeup; 74 u32 pad_type[32]; 75 const struct mxc_gpio_hwdata *hwdata; 76 }; 77 78 static struct mxc_gpio_hwdata imx1_imx21_gpio_hwdata = { 79 .dr_reg = 0x1c, 80 .gdir_reg = 0x00, 81 .psr_reg = 0x24, 82 .icr1_reg = 0x28, 83 .icr2_reg = 0x2c, 84 .imr_reg = 0x30, 85 .isr_reg = 0x34, 86 .edge_sel_reg = -EINVAL, 87 .low_level = 0x03, 88 .high_level = 0x02, 89 .rise_edge = 0x00, 90 .fall_edge = 0x01, 91 }; 92 93 static struct mxc_gpio_hwdata imx31_gpio_hwdata = { 94 .dr_reg = 0x00, 95 .gdir_reg = 0x04, 96 .psr_reg = 0x08, 97 .icr1_reg = 0x0c, 98 .icr2_reg = 0x10, 99 .imr_reg = 0x14, 100 .isr_reg = 0x18, 101 .edge_sel_reg = -EINVAL, 102 .low_level = 0x00, 103 .high_level = 0x01, 104 .rise_edge = 0x02, 105 .fall_edge = 0x03, 106 }; 107 108 static struct mxc_gpio_hwdata imx35_gpio_hwdata = { 109 .dr_reg = 0x00, 110 .gdir_reg = 0x04, 111 .psr_reg = 0x08, 112 .icr1_reg = 0x0c, 113 .icr2_reg = 0x10, 114 .imr_reg = 0x14, 115 .isr_reg = 0x18, 116 .edge_sel_reg = 0x1c, 117 .low_level = 0x00, 118 .high_level = 0x01, 119 .rise_edge = 0x02, 120 .fall_edge = 0x03, 121 }; 122 123 #define GPIO_DR (port->hwdata->dr_reg) 124 #define GPIO_GDIR (port->hwdata->gdir_reg) 125 #define GPIO_PSR (port->hwdata->psr_reg) 126 #define GPIO_ICR1 (port->hwdata->icr1_reg) 127 #define GPIO_ICR2 (port->hwdata->icr2_reg) 128 #define GPIO_IMR (port->hwdata->imr_reg) 129 #define GPIO_ISR (port->hwdata->isr_reg) 130 #define GPIO_EDGE_SEL (port->hwdata->edge_sel_reg) 131 132 #define GPIO_INT_LOW_LEV (port->hwdata->low_level) 133 #define GPIO_INT_HIGH_LEV (port->hwdata->high_level) 134 #define GPIO_INT_RISE_EDGE (port->hwdata->rise_edge) 135 #define GPIO_INT_FALL_EDGE (port->hwdata->fall_edge) 136 #define GPIO_INT_BOTH_EDGES 0x4 137 138 static const struct of_device_id mxc_gpio_dt_ids[] = { 139 { .compatible = "fsl,imx1-gpio", .data = &imx1_imx21_gpio_hwdata }, 140 { .compatible = "fsl,imx21-gpio", .data = &imx1_imx21_gpio_hwdata }, 141 { .compatible = "fsl,imx31-gpio", .data = &imx31_gpio_hwdata }, 142 { .compatible = "fsl,imx35-gpio", .data = &imx35_gpio_hwdata }, 143 { .compatible = "fsl,imx7d-gpio", .data = &imx35_gpio_hwdata }, 144 { .compatible = "fsl,imx8dxl-gpio", .data = &imx35_gpio_hwdata }, 145 { .compatible = "fsl,imx8qm-gpio", .data = &imx35_gpio_hwdata }, 146 { .compatible = "fsl,imx8qxp-gpio", .data = &imx35_gpio_hwdata }, 147 { /* sentinel */ } 148 }; 149 MODULE_DEVICE_TABLE(of, mxc_gpio_dt_ids); 150 151 /* 152 * MX2 has one interrupt *for all* gpio ports. The list is used 153 * to save the references to all ports, so that mx2_gpio_irq_handler 154 * can walk through all interrupt status registers. 155 */ 156 static LIST_HEAD(mxc_gpio_ports); 157 158 /* Note: This driver assumes 32 GPIOs are handled in one register */ 159 gpio_set_irq_type(struct irq_data * d,u32 type)160 static int gpio_set_irq_type(struct irq_data *d, u32 type) 161 { 162 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 163 struct mxc_gpio_port *port = gc->private; 164 unsigned long flags; 165 u32 bit, val; 166 u32 gpio_idx = d->hwirq; 167 int edge; 168 void __iomem *reg = port->base; 169 170 port->both_edges &= ~(1 << gpio_idx); 171 switch (type) { 172 case IRQ_TYPE_EDGE_RISING: 173 edge = GPIO_INT_RISE_EDGE; 174 break; 175 case IRQ_TYPE_EDGE_FALLING: 176 edge = GPIO_INT_FALL_EDGE; 177 break; 178 case IRQ_TYPE_EDGE_BOTH: 179 if (GPIO_EDGE_SEL >= 0) { 180 edge = GPIO_INT_BOTH_EDGES; 181 } else { 182 val = port->gc.get(&port->gc, gpio_idx); 183 if (val) { 184 edge = GPIO_INT_LOW_LEV; 185 pr_debug("mxc: set GPIO %d to low trigger\n", gpio_idx); 186 } else { 187 edge = GPIO_INT_HIGH_LEV; 188 pr_debug("mxc: set GPIO %d to high trigger\n", gpio_idx); 189 } 190 port->both_edges |= 1 << gpio_idx; 191 } 192 break; 193 case IRQ_TYPE_LEVEL_LOW: 194 edge = GPIO_INT_LOW_LEV; 195 break; 196 case IRQ_TYPE_LEVEL_HIGH: 197 edge = GPIO_INT_HIGH_LEV; 198 break; 199 default: 200 return -EINVAL; 201 } 202 203 raw_spin_lock_irqsave(&port->gc.bgpio_lock, flags); 204 205 if (GPIO_EDGE_SEL >= 0) { 206 val = readl(port->base + GPIO_EDGE_SEL); 207 if (edge == GPIO_INT_BOTH_EDGES) 208 writel(val | (1 << gpio_idx), 209 port->base + GPIO_EDGE_SEL); 210 else 211 writel(val & ~(1 << gpio_idx), 212 port->base + GPIO_EDGE_SEL); 213 } 214 215 if (edge != GPIO_INT_BOTH_EDGES) { 216 reg += GPIO_ICR1 + ((gpio_idx & 0x10) >> 2); /* lower or upper register */ 217 bit = gpio_idx & 0xf; 218 val = readl(reg) & ~(0x3 << (bit << 1)); 219 writel(val | (edge << (bit << 1)), reg); 220 } 221 222 writel(1 << gpio_idx, port->base + GPIO_ISR); 223 port->pad_type[gpio_idx] = type; 224 225 raw_spin_unlock_irqrestore(&port->gc.bgpio_lock, flags); 226 227 return port->gc.direction_input(&port->gc, gpio_idx); 228 } 229 mxc_flip_edge(struct mxc_gpio_port * port,u32 gpio)230 static void mxc_flip_edge(struct mxc_gpio_port *port, u32 gpio) 231 { 232 void __iomem *reg = port->base; 233 unsigned long flags; 234 u32 bit, val; 235 int edge; 236 237 raw_spin_lock_irqsave(&port->gc.bgpio_lock, flags); 238 239 reg += GPIO_ICR1 + ((gpio & 0x10) >> 2); /* lower or upper register */ 240 bit = gpio & 0xf; 241 val = readl(reg); 242 edge = (val >> (bit << 1)) & 3; 243 val &= ~(0x3 << (bit << 1)); 244 if (edge == GPIO_INT_HIGH_LEV) { 245 edge = GPIO_INT_LOW_LEV; 246 pr_debug("mxc: switch GPIO %d to low trigger\n", gpio); 247 } else if (edge == GPIO_INT_LOW_LEV) { 248 edge = GPIO_INT_HIGH_LEV; 249 pr_debug("mxc: switch GPIO %d to high trigger\n", gpio); 250 } else { 251 pr_err("mxc: invalid configuration for GPIO %d: %x\n", 252 gpio, edge); 253 goto unlock; 254 } 255 writel(val | (edge << (bit << 1)), reg); 256 257 unlock: 258 raw_spin_unlock_irqrestore(&port->gc.bgpio_lock, flags); 259 } 260 261 /* handle 32 interrupts in one status register */ mxc_gpio_irq_handler(struct mxc_gpio_port * port,u32 irq_stat)262 static void mxc_gpio_irq_handler(struct mxc_gpio_port *port, u32 irq_stat) 263 { 264 while (irq_stat != 0) { 265 int irqoffset = fls(irq_stat) - 1; 266 267 if (port->both_edges & (1 << irqoffset)) 268 mxc_flip_edge(port, irqoffset); 269 270 generic_handle_domain_irq(port->domain, irqoffset); 271 272 irq_stat &= ~(1 << irqoffset); 273 } 274 } 275 276 /* MX1 and MX3 has one interrupt *per* gpio port */ mx3_gpio_irq_handler(struct irq_desc * desc)277 static void mx3_gpio_irq_handler(struct irq_desc *desc) 278 { 279 u32 irq_stat; 280 struct mxc_gpio_port *port = irq_desc_get_handler_data(desc); 281 struct irq_chip *chip = irq_desc_get_chip(desc); 282 283 if (port->is_pad_wakeup) 284 return; 285 286 chained_irq_enter(chip, desc); 287 288 irq_stat = readl(port->base + GPIO_ISR) & readl(port->base + GPIO_IMR); 289 290 mxc_gpio_irq_handler(port, irq_stat); 291 292 chained_irq_exit(chip, desc); 293 } 294 295 /* MX2 has one interrupt *for all* gpio ports */ mx2_gpio_irq_handler(struct irq_desc * desc)296 static void mx2_gpio_irq_handler(struct irq_desc *desc) 297 { 298 u32 irq_msk, irq_stat; 299 struct mxc_gpio_port *port; 300 struct irq_chip *chip = irq_desc_get_chip(desc); 301 302 chained_irq_enter(chip, desc); 303 304 /* walk through all interrupt status registers */ 305 list_for_each_entry(port, &mxc_gpio_ports, node) { 306 irq_msk = readl(port->base + GPIO_IMR); 307 if (!irq_msk) 308 continue; 309 310 irq_stat = readl(port->base + GPIO_ISR) & irq_msk; 311 if (irq_stat) 312 mxc_gpio_irq_handler(port, irq_stat); 313 } 314 chained_irq_exit(chip, desc); 315 } 316 317 /* 318 * Set interrupt number "irq" in the GPIO as a wake-up source. 319 * While system is running, all registered GPIO interrupts need to have 320 * wake-up enabled. When system is suspended, only selected GPIO interrupts 321 * need to have wake-up enabled. 322 * @param irq interrupt source number 323 * @param enable enable as wake-up if equal to non-zero 324 * @return This function returns 0 on success. 325 */ gpio_set_wake_irq(struct irq_data * d,u32 enable)326 static int gpio_set_wake_irq(struct irq_data *d, u32 enable) 327 { 328 struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); 329 struct mxc_gpio_port *port = gc->private; 330 u32 gpio_idx = d->hwirq; 331 int ret; 332 333 if (enable) { 334 if (port->irq_high && (gpio_idx >= 16)) 335 ret = enable_irq_wake(port->irq_high); 336 else 337 ret = enable_irq_wake(port->irq); 338 port->wakeup_pads |= (1 << gpio_idx); 339 } else { 340 if (port->irq_high && (gpio_idx >= 16)) 341 ret = disable_irq_wake(port->irq_high); 342 else 343 ret = disable_irq_wake(port->irq); 344 port->wakeup_pads &= ~(1 << gpio_idx); 345 } 346 347 return ret; 348 } 349 mxc_gpio_init_gc(struct mxc_gpio_port * port,int irq_base)350 static int mxc_gpio_init_gc(struct mxc_gpio_port *port, int irq_base) 351 { 352 struct irq_chip_generic *gc; 353 struct irq_chip_type *ct; 354 int rv; 355 356 gc = devm_irq_alloc_generic_chip(port->dev, "gpio-mxc", 1, irq_base, 357 port->base, handle_level_irq); 358 if (!gc) 359 return -ENOMEM; 360 gc->private = port; 361 362 ct = gc->chip_types; 363 ct->chip.irq_ack = irq_gc_ack_set_bit; 364 ct->chip.irq_mask = irq_gc_mask_clr_bit; 365 ct->chip.irq_unmask = irq_gc_mask_set_bit; 366 ct->chip.irq_set_type = gpio_set_irq_type; 367 ct->chip.irq_set_wake = gpio_set_wake_irq; 368 ct->chip.flags = IRQCHIP_MASK_ON_SUSPEND | IRQCHIP_ENABLE_WAKEUP_ON_SUSPEND; 369 ct->regs.ack = GPIO_ISR; 370 ct->regs.mask = GPIO_IMR; 371 372 rv = devm_irq_setup_generic_chip(port->dev, gc, IRQ_MSK(32), 373 IRQ_GC_INIT_NESTED_LOCK, 374 IRQ_NOREQUEST, 0); 375 376 return rv; 377 } 378 mxc_gpio_to_irq(struct gpio_chip * gc,unsigned offset)379 static int mxc_gpio_to_irq(struct gpio_chip *gc, unsigned offset) 380 { 381 struct mxc_gpio_port *port = gpiochip_get_data(gc); 382 383 return irq_find_mapping(port->domain, offset); 384 } 385 mxc_gpio_request(struct gpio_chip * chip,unsigned int offset)386 static int mxc_gpio_request(struct gpio_chip *chip, unsigned int offset) 387 { 388 int ret; 389 390 ret = gpiochip_generic_request(chip, offset); 391 if (ret) 392 return ret; 393 394 return pm_runtime_resume_and_get(chip->parent); 395 } 396 mxc_gpio_free(struct gpio_chip * chip,unsigned int offset)397 static void mxc_gpio_free(struct gpio_chip *chip, unsigned int offset) 398 { 399 gpiochip_generic_free(chip, offset); 400 pm_runtime_put(chip->parent); 401 } 402 mxc_update_irq_chained_handler(struct mxc_gpio_port * port,bool enable)403 static void mxc_update_irq_chained_handler(struct mxc_gpio_port *port, bool enable) 404 { 405 if (enable) 406 irq_set_chained_handler_and_data(port->irq, port->mx_irq_handler, port); 407 else 408 irq_set_chained_handler_and_data(port->irq, NULL, NULL); 409 410 /* setup handler for GPIO 16 to 31 */ 411 if (port->irq_high > 0) { 412 if (enable) 413 irq_set_chained_handler_and_data(port->irq_high, 414 port->mx_irq_handler, 415 port); 416 else 417 irq_set_chained_handler_and_data(port->irq_high, NULL, NULL); 418 } 419 } 420 mxc_gpio_probe(struct platform_device * pdev)421 static int mxc_gpio_probe(struct platform_device *pdev) 422 { 423 struct device_node *np = pdev->dev.of_node; 424 struct mxc_gpio_port *port; 425 int irq_count; 426 int irq_base; 427 int err; 428 429 port = devm_kzalloc(&pdev->dev, sizeof(*port), GFP_KERNEL); 430 if (!port) 431 return -ENOMEM; 432 433 port->dev = &pdev->dev; 434 port->hwdata = device_get_match_data(&pdev->dev); 435 436 port->base = devm_platform_ioremap_resource(pdev, 0); 437 if (IS_ERR(port->base)) 438 return PTR_ERR(port->base); 439 440 irq_count = platform_irq_count(pdev); 441 if (irq_count < 0) 442 return irq_count; 443 444 if (irq_count > 1) { 445 port->irq_high = platform_get_irq(pdev, 1); 446 if (port->irq_high < 0) 447 port->irq_high = 0; 448 } 449 450 port->irq = platform_get_irq(pdev, 0); 451 if (port->irq < 0) 452 return port->irq; 453 454 /* the controller clock is optional */ 455 port->clk = devm_clk_get_optional_enabled(&pdev->dev, NULL); 456 if (IS_ERR(port->clk)) 457 return PTR_ERR(port->clk); 458 459 if (of_device_is_compatible(np, "fsl,imx7d-gpio")) 460 port->power_off = true; 461 462 pm_runtime_get_noresume(&pdev->dev); 463 pm_runtime_set_active(&pdev->dev); 464 pm_runtime_enable(&pdev->dev); 465 466 /* disable the interrupt and clear the status */ 467 writel(0, port->base + GPIO_IMR); 468 writel(~0, port->base + GPIO_ISR); 469 470 if (of_device_is_compatible(np, "fsl,imx21-gpio")) { 471 /* 472 * Setup one handler for all GPIO interrupts. Actually setting 473 * the handler is needed only once, but doing it for every port 474 * is more robust and easier. 475 */ 476 port->irq_high = -1; 477 port->mx_irq_handler = mx2_gpio_irq_handler; 478 } else 479 port->mx_irq_handler = mx3_gpio_irq_handler; 480 481 mxc_update_irq_chained_handler(port, true); 482 err = bgpio_init(&port->gc, &pdev->dev, 4, 483 port->base + GPIO_PSR, 484 port->base + GPIO_DR, NULL, 485 port->base + GPIO_GDIR, NULL, 486 BGPIOF_READ_OUTPUT_REG_SET); 487 if (err) 488 goto out_bgio; 489 490 port->gc.request = mxc_gpio_request; 491 port->gc.free = mxc_gpio_free; 492 port->gc.to_irq = mxc_gpio_to_irq; 493 port->gc.base = of_alias_get_id(np, "gpio") * 32; 494 495 err = devm_gpiochip_add_data(&pdev->dev, &port->gc, port); 496 if (err) 497 goto out_bgio; 498 499 irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, 32, numa_node_id()); 500 if (irq_base < 0) { 501 err = irq_base; 502 goto out_bgio; 503 } 504 505 port->domain = irq_domain_add_legacy(np, 32, irq_base, 0, 506 &irq_domain_simple_ops, NULL); 507 if (!port->domain) { 508 err = -ENODEV; 509 goto out_bgio; 510 } 511 512 irq_domain_set_pm_device(port->domain, &pdev->dev); 513 514 /* gpio-mxc can be a generic irq chip */ 515 err = mxc_gpio_init_gc(port, irq_base); 516 if (err < 0) 517 goto out_irqdomain_remove; 518 519 list_add_tail(&port->node, &mxc_gpio_ports); 520 521 platform_set_drvdata(pdev, port); 522 pm_runtime_put_autosuspend(&pdev->dev); 523 524 return 0; 525 526 out_irqdomain_remove: 527 irq_domain_remove(port->domain); 528 out_bgio: 529 pm_runtime_disable(&pdev->dev); 530 pm_runtime_put_noidle(&pdev->dev); 531 dev_info(&pdev->dev, "%s failed with errno %d\n", __func__, err); 532 return err; 533 } 534 mxc_gpio_save_regs(struct mxc_gpio_port * port)535 static void mxc_gpio_save_regs(struct mxc_gpio_port *port) 536 { 537 if (!port->power_off) 538 return; 539 540 port->gpio_saved_reg.icr1 = readl(port->base + GPIO_ICR1); 541 port->gpio_saved_reg.icr2 = readl(port->base + GPIO_ICR2); 542 port->gpio_saved_reg.imr = readl(port->base + GPIO_IMR); 543 port->gpio_saved_reg.gdir = readl(port->base + GPIO_GDIR); 544 port->gpio_saved_reg.edge_sel = readl(port->base + GPIO_EDGE_SEL); 545 port->gpio_saved_reg.dr = readl(port->base + GPIO_DR); 546 } 547 mxc_gpio_restore_regs(struct mxc_gpio_port * port)548 static void mxc_gpio_restore_regs(struct mxc_gpio_port *port) 549 { 550 if (!port->power_off) 551 return; 552 553 writel(port->gpio_saved_reg.icr1, port->base + GPIO_ICR1); 554 writel(port->gpio_saved_reg.icr2, port->base + GPIO_ICR2); 555 writel(port->gpio_saved_reg.imr, port->base + GPIO_IMR); 556 writel(port->gpio_saved_reg.gdir, port->base + GPIO_GDIR); 557 writel(port->gpio_saved_reg.edge_sel, port->base + GPIO_EDGE_SEL); 558 writel(port->gpio_saved_reg.dr, port->base + GPIO_DR); 559 } 560 mxc_gpio_generic_config(struct mxc_gpio_port * port,unsigned int offset,unsigned long conf)561 static bool mxc_gpio_generic_config(struct mxc_gpio_port *port, 562 unsigned int offset, unsigned long conf) 563 { 564 struct device_node *np = port->dev->of_node; 565 566 if (of_device_is_compatible(np, "fsl,imx8dxl-gpio") || 567 of_device_is_compatible(np, "fsl,imx8qxp-gpio") || 568 of_device_is_compatible(np, "fsl,imx8qm-gpio")) 569 return (gpiochip_generic_config(&port->gc, offset, conf) == 0); 570 571 return false; 572 } 573 mxc_gpio_set_pad_wakeup(struct mxc_gpio_port * port,bool enable)574 static bool mxc_gpio_set_pad_wakeup(struct mxc_gpio_port *port, bool enable) 575 { 576 unsigned long config; 577 bool ret = false; 578 int i, type; 579 580 static const u32 pad_type_map[] = { 581 IMX_SCU_WAKEUP_OFF, /* 0 */ 582 IMX_SCU_WAKEUP_RISE_EDGE, /* IRQ_TYPE_EDGE_RISING */ 583 IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_FALLING */ 584 IMX_SCU_WAKEUP_FALL_EDGE, /* IRQ_TYPE_EDGE_BOTH */ 585 IMX_SCU_WAKEUP_HIGH_LVL, /* IRQ_TYPE_LEVEL_HIGH */ 586 IMX_SCU_WAKEUP_OFF, /* 5 */ 587 IMX_SCU_WAKEUP_OFF, /* 6 */ 588 IMX_SCU_WAKEUP_OFF, /* 7 */ 589 IMX_SCU_WAKEUP_LOW_LVL, /* IRQ_TYPE_LEVEL_LOW */ 590 }; 591 592 for (i = 0; i < 32; i++) { 593 if ((port->wakeup_pads & (1 << i))) { 594 type = port->pad_type[i]; 595 if (enable) 596 config = pad_type_map[type]; 597 else 598 config = IMX_SCU_WAKEUP_OFF; 599 ret |= mxc_gpio_generic_config(port, i, config); 600 } 601 } 602 603 return ret; 604 } 605 mxc_gpio_runtime_suspend(struct device * dev)606 static int mxc_gpio_runtime_suspend(struct device *dev) 607 { 608 struct mxc_gpio_port *port = dev_get_drvdata(dev); 609 610 mxc_gpio_save_regs(port); 611 clk_disable_unprepare(port->clk); 612 mxc_update_irq_chained_handler(port, false); 613 614 return 0; 615 } 616 mxc_gpio_runtime_resume(struct device * dev)617 static int mxc_gpio_runtime_resume(struct device *dev) 618 { 619 struct mxc_gpio_port *port = dev_get_drvdata(dev); 620 int ret; 621 622 mxc_update_irq_chained_handler(port, true); 623 ret = clk_prepare_enable(port->clk); 624 if (ret) { 625 mxc_update_irq_chained_handler(port, false); 626 return ret; 627 } 628 629 mxc_gpio_restore_regs(port); 630 631 return 0; 632 } 633 mxc_gpio_noirq_suspend(struct device * dev)634 static int mxc_gpio_noirq_suspend(struct device *dev) 635 { 636 struct platform_device *pdev = to_platform_device(dev); 637 struct mxc_gpio_port *port = platform_get_drvdata(pdev); 638 639 if (port->wakeup_pads > 0) 640 port->is_pad_wakeup = mxc_gpio_set_pad_wakeup(port, true); 641 642 return 0; 643 } 644 mxc_gpio_noirq_resume(struct device * dev)645 static int mxc_gpio_noirq_resume(struct device *dev) 646 { 647 struct platform_device *pdev = to_platform_device(dev); 648 struct mxc_gpio_port *port = platform_get_drvdata(pdev); 649 650 if (port->wakeup_pads > 0) 651 mxc_gpio_set_pad_wakeup(port, false); 652 port->is_pad_wakeup = false; 653 654 return 0; 655 } 656 657 static const struct dev_pm_ops mxc_gpio_dev_pm_ops = { 658 NOIRQ_SYSTEM_SLEEP_PM_OPS(mxc_gpio_noirq_suspend, mxc_gpio_noirq_resume) 659 RUNTIME_PM_OPS(mxc_gpio_runtime_suspend, mxc_gpio_runtime_resume, NULL) 660 }; 661 mxc_gpio_syscore_suspend(void)662 static int mxc_gpio_syscore_suspend(void) 663 { 664 struct mxc_gpio_port *port; 665 int ret; 666 667 /* walk through all ports */ 668 list_for_each_entry(port, &mxc_gpio_ports, node) { 669 ret = clk_prepare_enable(port->clk); 670 if (ret) 671 return ret; 672 mxc_gpio_save_regs(port); 673 clk_disable_unprepare(port->clk); 674 } 675 676 return 0; 677 } 678 mxc_gpio_syscore_resume(void)679 static void mxc_gpio_syscore_resume(void) 680 { 681 struct mxc_gpio_port *port; 682 int ret; 683 684 /* walk through all ports */ 685 list_for_each_entry(port, &mxc_gpio_ports, node) { 686 ret = clk_prepare_enable(port->clk); 687 if (ret) { 688 pr_err("mxc: failed to enable gpio clock %d\n", ret); 689 return; 690 } 691 mxc_gpio_restore_regs(port); 692 clk_disable_unprepare(port->clk); 693 } 694 } 695 696 static struct syscore_ops mxc_gpio_syscore_ops = { 697 .suspend = mxc_gpio_syscore_suspend, 698 .resume = mxc_gpio_syscore_resume, 699 }; 700 701 static struct platform_driver mxc_gpio_driver = { 702 .driver = { 703 .name = "gpio-mxc", 704 .of_match_table = mxc_gpio_dt_ids, 705 .suppress_bind_attrs = true, 706 .pm = pm_ptr(&mxc_gpio_dev_pm_ops), 707 }, 708 .probe = mxc_gpio_probe, 709 }; 710 gpio_mxc_init(void)711 static int __init gpio_mxc_init(void) 712 { 713 register_syscore_ops(&mxc_gpio_syscore_ops); 714 715 return platform_driver_register(&mxc_gpio_driver); 716 } 717 subsys_initcall(gpio_mxc_init); 718 719 MODULE_AUTHOR("Shawn Guo <shawn.guo@linaro.org>"); 720 MODULE_DESCRIPTION("i.MX GPIO Driver"); 721 MODULE_LICENSE("GPL"); 722