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1// SPDX-License-Identifier: GPL-2.0-only2/*3 *  linux/arch/arm/plat-pxa/gpio.c4 *5 *  Generic PXA GPIO handling6 *7 *  Author:	Nicolas Pitre8 *  Created:	Jun 15, 20019 *  Copyright:	MontaVista Software Inc.10 */11#include <linux/module.h>12#include <linux/clk.h>13#include <linux/err.h>14#include <linux/gpio/driver.h>15#include <linux/gpio-pxa.h>16#include <linux/init.h>17#include <linux/interrupt.h>18#include <linux/irq.h>19#include <linux/irqdomain.h>20#include <linux/irqchip/chained_irq.h>21#include <linux/io.h>22#include <linux/of.h>23#include <linux/pinctrl/consumer.h>24#include <linux/platform_device.h>25#include <linux/syscore_ops.h>26#include <linux/slab.h>27 28/*29 * We handle the GPIOs by banks, each bank covers up to 32 GPIOs with30 * one set of registers. The register offsets are organized below:31 *32 *           GPLR    GPDR    GPSR    GPCR    GRER    GFER    GEDR33 * BANK 0 - 0x0000  0x000C  0x0018  0x0024  0x0030  0x003C  0x004834 * BANK 1 - 0x0004  0x0010  0x001C  0x0028  0x0034  0x0040  0x004C35 * BANK 2 - 0x0008  0x0014  0x0020  0x002C  0x0038  0x0044  0x005036 *37 * BANK 3 - 0x0100  0x010C  0x0118  0x0124  0x0130  0x013C  0x014838 * BANK 4 - 0x0104  0x0110  0x011C  0x0128  0x0134  0x0140  0x014C39 * BANK 5 - 0x0108  0x0114  0x0120  0x012C  0x0138  0x0144  0x015040 *41 * BANK 6 - 0x0200  0x020C  0x0218  0x0224  0x0230  0x023C  0x024842 *43 * NOTE:44 *   BANK 3 is only available on PXA27x and later processors.45 *   BANK 4 and 5 are only available on PXA935, PXA192846 *   BANK 6 is only available on PXA192847 */48 49#define GPLR_OFFSET	0x0050#define GPDR_OFFSET	0x0C51#define GPSR_OFFSET	0x1852#define GPCR_OFFSET	0x2453#define GRER_OFFSET	0x3054#define GFER_OFFSET	0x3C55#define GEDR_OFFSET	0x4856#define GAFR_OFFSET	0x5457#define ED_MASK_OFFSET	0x9C	/* GPIO edge detection for AP side */58 59#define BANK_OFF(n)	(((n) / 3) << 8) + (((n) % 3) << 2)60 61int pxa_last_gpio;62static int irq_base;63 64struct pxa_gpio_bank {65	void __iomem	*regbase;66	unsigned long	irq_mask;67	unsigned long	irq_edge_rise;68	unsigned long	irq_edge_fall;69 70#ifdef CONFIG_PM71	unsigned long	saved_gplr;72	unsigned long	saved_gpdr;73	unsigned long	saved_grer;74	unsigned long	saved_gfer;75#endif76};77 78struct pxa_gpio_chip {79	struct device *dev;80	struct gpio_chip chip;81	struct pxa_gpio_bank *banks;82	struct irq_domain *irqdomain;83 84	int irq0;85	int irq1;86	int (*set_wake)(unsigned int gpio, unsigned int on);87};88 89enum pxa_gpio_type {90	PXA25X_GPIO = 0,91	PXA26X_GPIO,92	PXA27X_GPIO,93	PXA3XX_GPIO,94	PXA93X_GPIO,95	MMP_GPIO = 0x10,96	MMP2_GPIO,97	PXA1928_GPIO,98};99 100struct pxa_gpio_id {101	enum pxa_gpio_type	type;102	int			gpio_nums;103};104 105static DEFINE_SPINLOCK(gpio_lock);106static struct pxa_gpio_chip *pxa_gpio_chip;107static enum pxa_gpio_type gpio_type;108 109static struct pxa_gpio_id pxa25x_id = {110	.type		= PXA25X_GPIO,111	.gpio_nums	= 85,112};113 114static struct pxa_gpio_id pxa26x_id = {115	.type		= PXA26X_GPIO,116	.gpio_nums	= 90,117};118 119static struct pxa_gpio_id pxa27x_id = {120	.type		= PXA27X_GPIO,121	.gpio_nums	= 121,122};123 124static struct pxa_gpio_id pxa3xx_id = {125	.type		= PXA3XX_GPIO,126	.gpio_nums	= 128,127};128 129static struct pxa_gpio_id pxa93x_id = {130	.type		= PXA93X_GPIO,131	.gpio_nums	= 192,132};133 134static struct pxa_gpio_id mmp_id = {135	.type		= MMP_GPIO,136	.gpio_nums	= 128,137};138 139static struct pxa_gpio_id mmp2_id = {140	.type		= MMP2_GPIO,141	.gpio_nums	= 192,142};143 144static struct pxa_gpio_id pxa1928_id = {145	.type		= PXA1928_GPIO,146	.gpio_nums	= 224,147};148 149#define for_each_gpio_bank(i, b, pc)					\150	for (i = 0, b = pc->banks; i <= pxa_last_gpio; i += 32, b++)151 152static inline struct pxa_gpio_chip *chip_to_pxachip(struct gpio_chip *c)153{154	struct pxa_gpio_chip *pxa_chip = gpiochip_get_data(c);155 156	return pxa_chip;157}158 159static inline void __iomem *gpio_bank_base(struct gpio_chip *c, int gpio)160{161	struct pxa_gpio_chip *p = gpiochip_get_data(c);162	struct pxa_gpio_bank *bank = p->banks + (gpio / 32);163 164	return bank->regbase;165}166 167static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,168						    unsigned gpio)169{170	return chip_to_pxachip(c)->banks + gpio / 32;171}172 173static inline int gpio_is_mmp_type(int type)174{175	return (type & MMP_GPIO) != 0;176}177 178/* GPIO86/87/88/89 on PXA26x have their direction bits in PXA_GPDR(2 inverted,179 * as well as their Alternate Function value being '1' for GPIO in GAFRx.180 */181static inline int __gpio_is_inverted(int gpio)182{183	if ((gpio_type == PXA26X_GPIO) && (gpio > 85))184		return 1;185	return 0;186}187 188/*189 * On PXA25x and PXA27x, GAFRx and GPDRx together decide the alternate190 * function of a GPIO, and GPDRx cannot be altered once configured. It191 * is attributed as "occupied" here (I know this terminology isn't192 * accurate, you are welcome to propose a better one :-)193 */194static inline int __gpio_is_occupied(struct pxa_gpio_chip *pchip, unsigned gpio)195{196	void __iomem *base;197	unsigned long gafr = 0, gpdr = 0;198	int ret, af = 0, dir = 0;199 200	base = gpio_bank_base(&pchip->chip, gpio);201	gpdr = readl_relaxed(base + GPDR_OFFSET);202 203	switch (gpio_type) {204	case PXA25X_GPIO:205	case PXA26X_GPIO:206	case PXA27X_GPIO:207		gafr = readl_relaxed(base + GAFR_OFFSET);208		af = (gafr >> ((gpio & 0xf) * 2)) & 0x3;209		dir = gpdr & GPIO_bit(gpio);210 211		if (__gpio_is_inverted(gpio))212			ret = (af != 1) || (dir == 0);213		else214			ret = (af != 0) || (dir != 0);215		break;216	default:217		ret = gpdr & GPIO_bit(gpio);218		break;219	}220	return ret;221}222 223int pxa_irq_to_gpio(int irq)224{225	struct pxa_gpio_chip *pchip = pxa_gpio_chip;226	int irq_gpio0;227 228	irq_gpio0 = irq_find_mapping(pchip->irqdomain, 0);229	if (irq_gpio0 > 0)230		return irq - irq_gpio0;231 232	return irq_gpio0;233}234 235static bool pxa_gpio_has_pinctrl(void)236{237	switch (gpio_type) {238	case PXA3XX_GPIO:239	case MMP2_GPIO:240	case MMP_GPIO:241		return false;242 243	default:244		return true;245	}246}247 248static int pxa_gpio_to_irq(struct gpio_chip *chip, unsigned offset)249{250	struct pxa_gpio_chip *pchip = chip_to_pxachip(chip);251 252	return irq_find_mapping(pchip->irqdomain, offset);253}254 255static int pxa_gpio_direction_input(struct gpio_chip *chip, unsigned offset)256{257	void __iomem *base = gpio_bank_base(chip, offset);258	uint32_t value, mask = GPIO_bit(offset);259	unsigned long flags;260	int ret;261 262	if (pxa_gpio_has_pinctrl()) {263		ret = pinctrl_gpio_direction_input(chip, offset);264		if (ret)265			return ret;266	}267 268	spin_lock_irqsave(&gpio_lock, flags);269 270	value = readl_relaxed(base + GPDR_OFFSET);271	if (__gpio_is_inverted(chip->base + offset))272		value |= mask;273	else274		value &= ~mask;275	writel_relaxed(value, base + GPDR_OFFSET);276 277	spin_unlock_irqrestore(&gpio_lock, flags);278	return 0;279}280 281static int pxa_gpio_direction_output(struct gpio_chip *chip,282				     unsigned offset, int value)283{284	void __iomem *base = gpio_bank_base(chip, offset);285	uint32_t tmp, mask = GPIO_bit(offset);286	unsigned long flags;287	int ret;288 289	writel_relaxed(mask, base + (value ? GPSR_OFFSET : GPCR_OFFSET));290 291	if (pxa_gpio_has_pinctrl()) {292		ret = pinctrl_gpio_direction_output(chip, offset);293		if (ret)294			return ret;295	}296 297	spin_lock_irqsave(&gpio_lock, flags);298 299	tmp = readl_relaxed(base + GPDR_OFFSET);300	if (__gpio_is_inverted(chip->base + offset))301		tmp &= ~mask;302	else303		tmp |= mask;304	writel_relaxed(tmp, base + GPDR_OFFSET);305 306	spin_unlock_irqrestore(&gpio_lock, flags);307	return 0;308}309 310static int pxa_gpio_get(struct gpio_chip *chip, unsigned offset)311{312	void __iomem *base = gpio_bank_base(chip, offset);313	u32 gplr = readl_relaxed(base + GPLR_OFFSET);314 315	return !!(gplr & GPIO_bit(offset));316}317 318static void pxa_gpio_set(struct gpio_chip *chip, unsigned offset, int value)319{320	void __iomem *base = gpio_bank_base(chip, offset);321 322	writel_relaxed(GPIO_bit(offset),323		       base + (value ? GPSR_OFFSET : GPCR_OFFSET));324}325 326#ifdef CONFIG_OF_GPIO327static int pxa_gpio_of_xlate(struct gpio_chip *gc,328			     const struct of_phandle_args *gpiospec,329			     u32 *flags)330{331	if (gpiospec->args[0] > pxa_last_gpio)332		return -EINVAL;333 334	if (flags)335		*flags = gpiospec->args[1];336 337	return gpiospec->args[0];338}339#endif340 341static int pxa_init_gpio_chip(struct pxa_gpio_chip *pchip, int ngpio, void __iomem *regbase)342{343	int i, gpio, nbanks = DIV_ROUND_UP(ngpio, 32);344	struct pxa_gpio_bank *bank;345 346	pchip->banks = devm_kcalloc(pchip->dev, nbanks, sizeof(*pchip->banks),347				    GFP_KERNEL);348	if (!pchip->banks)349		return -ENOMEM;350 351	pchip->chip.parent = pchip->dev;352	pchip->chip.label = "gpio-pxa";353	pchip->chip.direction_input  = pxa_gpio_direction_input;354	pchip->chip.direction_output = pxa_gpio_direction_output;355	pchip->chip.get = pxa_gpio_get;356	pchip->chip.set = pxa_gpio_set;357	pchip->chip.to_irq = pxa_gpio_to_irq;358	pchip->chip.ngpio = ngpio;359	pchip->chip.request = gpiochip_generic_request;360	pchip->chip.free = gpiochip_generic_free;361 362#ifdef CONFIG_OF_GPIO363	pchip->chip.of_xlate = pxa_gpio_of_xlate;364	pchip->chip.of_gpio_n_cells = 2;365#endif366 367	for (i = 0, gpio = 0; i < nbanks; i++, gpio += 32) {368		bank = pchip->banks + i;369		bank->regbase = regbase + BANK_OFF(i);370	}371 372	return gpiochip_add_data(&pchip->chip, pchip);373}374 375/* Update only those GRERx and GFERx edge detection register bits if those376 * bits are set in c->irq_mask377 */378static inline void update_edge_detect(struct pxa_gpio_bank *c)379{380	uint32_t grer, gfer;381 382	grer = readl_relaxed(c->regbase + GRER_OFFSET) & ~c->irq_mask;383	gfer = readl_relaxed(c->regbase + GFER_OFFSET) & ~c->irq_mask;384	grer |= c->irq_edge_rise & c->irq_mask;385	gfer |= c->irq_edge_fall & c->irq_mask;386	writel_relaxed(grer, c->regbase + GRER_OFFSET);387	writel_relaxed(gfer, c->regbase + GFER_OFFSET);388}389 390static int pxa_gpio_irq_type(struct irq_data *d, unsigned int type)391{392	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);393	unsigned int gpio = irqd_to_hwirq(d);394	struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);395	unsigned long gpdr, mask = GPIO_bit(gpio);396 397	if (type == IRQ_TYPE_PROBE) {398		/* Don't mess with enabled GPIOs using preconfigured edges or399		 * GPIOs set to alternate function or to output during probe400		 */401		if ((c->irq_edge_rise | c->irq_edge_fall) & GPIO_bit(gpio))402			return 0;403 404		if (__gpio_is_occupied(pchip, gpio))405			return 0;406 407		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;408	}409 410	gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);411 412	if (__gpio_is_inverted(gpio))413		writel_relaxed(gpdr | mask,  c->regbase + GPDR_OFFSET);414	else415		writel_relaxed(gpdr & ~mask, c->regbase + GPDR_OFFSET);416 417	if (type & IRQ_TYPE_EDGE_RISING)418		c->irq_edge_rise |= mask;419	else420		c->irq_edge_rise &= ~mask;421 422	if (type & IRQ_TYPE_EDGE_FALLING)423		c->irq_edge_fall |= mask;424	else425		c->irq_edge_fall &= ~mask;426 427	update_edge_detect(c);428 429	pr_debug("%s: IRQ%d (GPIO%d) - edge%s%s\n", __func__, d->irq, gpio,430		((type & IRQ_TYPE_EDGE_RISING)  ? " rising"  : ""),431		((type & IRQ_TYPE_EDGE_FALLING) ? " falling" : ""));432	return 0;433}434 435static irqreturn_t pxa_gpio_demux_handler(int in_irq, void *d)436{437	int loop, gpio, n, handled = 0;438	unsigned long gedr;439	struct pxa_gpio_chip *pchip = d;440	struct pxa_gpio_bank *c;441 442	do {443		loop = 0;444		for_each_gpio_bank(gpio, c, pchip) {445			gedr = readl_relaxed(c->regbase + GEDR_OFFSET);446			gedr = gedr & c->irq_mask;447			writel_relaxed(gedr, c->regbase + GEDR_OFFSET);448 449			for_each_set_bit(n, &gedr, BITS_PER_LONG) {450				loop = 1;451 452				generic_handle_domain_irq(pchip->irqdomain,453							  gpio + n);454			}455		}456		handled += loop;457	} while (loop);458 459	return handled ? IRQ_HANDLED : IRQ_NONE;460}461 462static irqreturn_t pxa_gpio_direct_handler(int in_irq, void *d)463{464	struct pxa_gpio_chip *pchip = d;465 466	if (in_irq == pchip->irq0) {467		generic_handle_domain_irq(pchip->irqdomain, 0);468	} else if (in_irq == pchip->irq1) {469		generic_handle_domain_irq(pchip->irqdomain, 1);470	} else {471		pr_err("%s() unknown irq %d\n", __func__, in_irq);472		return IRQ_NONE;473	}474	return IRQ_HANDLED;475}476 477static void pxa_ack_muxed_gpio(struct irq_data *d)478{479	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);480	unsigned int gpio = irqd_to_hwirq(d);481	void __iomem *base = gpio_bank_base(&pchip->chip, gpio);482 483	writel_relaxed(GPIO_bit(gpio), base + GEDR_OFFSET);484}485 486static void pxa_mask_muxed_gpio(struct irq_data *d)487{488	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);489	unsigned int gpio = irqd_to_hwirq(d);490	struct pxa_gpio_bank *b = gpio_to_pxabank(&pchip->chip, gpio);491	void __iomem *base = gpio_bank_base(&pchip->chip, gpio);492	uint32_t grer, gfer;493 494	b->irq_mask &= ~GPIO_bit(gpio);495 496	grer = readl_relaxed(base + GRER_OFFSET) & ~GPIO_bit(gpio);497	gfer = readl_relaxed(base + GFER_OFFSET) & ~GPIO_bit(gpio);498	writel_relaxed(grer, base + GRER_OFFSET);499	writel_relaxed(gfer, base + GFER_OFFSET);500}501 502static int pxa_gpio_set_wake(struct irq_data *d, unsigned int on)503{504	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);505	unsigned int gpio = irqd_to_hwirq(d);506 507	if (pchip->set_wake)508		return pchip->set_wake(gpio, on);509	else510		return 0;511}512 513static void pxa_unmask_muxed_gpio(struct irq_data *d)514{515	struct pxa_gpio_chip *pchip = irq_data_get_irq_chip_data(d);516	unsigned int gpio = irqd_to_hwirq(d);517	struct pxa_gpio_bank *c = gpio_to_pxabank(&pchip->chip, gpio);518 519	c->irq_mask |= GPIO_bit(gpio);520	update_edge_detect(c);521}522 523static struct irq_chip pxa_muxed_gpio_chip = {524	.name		= "GPIO",525	.irq_ack	= pxa_ack_muxed_gpio,526	.irq_mask	= pxa_mask_muxed_gpio,527	.irq_unmask	= pxa_unmask_muxed_gpio,528	.irq_set_type	= pxa_gpio_irq_type,529	.irq_set_wake	= pxa_gpio_set_wake,530};531 532static int pxa_gpio_nums(struct platform_device *pdev)533{534	const struct platform_device_id *id = platform_get_device_id(pdev);535	struct pxa_gpio_id *pxa_id = (struct pxa_gpio_id *)id->driver_data;536	int count = 0;537 538	switch (pxa_id->type) {539	case PXA25X_GPIO:540	case PXA26X_GPIO:541	case PXA27X_GPIO:542	case PXA3XX_GPIO:543	case PXA93X_GPIO:544	case MMP_GPIO:545	case MMP2_GPIO:546	case PXA1928_GPIO:547		gpio_type = pxa_id->type;548		count = pxa_id->gpio_nums - 1;549		break;550	default:551		count = -EINVAL;552		break;553	}554	return count;555}556 557static int pxa_irq_domain_map(struct irq_domain *d, unsigned int irq,558			      irq_hw_number_t hw)559{560	irq_set_chip_and_handler(irq, &pxa_muxed_gpio_chip,561				 handle_edge_irq);562	irq_set_chip_data(irq, d->host_data);563	irq_set_noprobe(irq);564	return 0;565}566 567static const struct irq_domain_ops pxa_irq_domain_ops = {568	.map	= pxa_irq_domain_map,569	.xlate	= irq_domain_xlate_twocell,570};571 572#ifdef CONFIG_OF573static const struct of_device_id pxa_gpio_dt_ids[] = {574	{ .compatible = "intel,pxa25x-gpio",	.data = &pxa25x_id, },575	{ .compatible = "intel,pxa26x-gpio",	.data = &pxa26x_id, },576	{ .compatible = "intel,pxa27x-gpio",	.data = &pxa27x_id, },577	{ .compatible = "intel,pxa3xx-gpio",	.data = &pxa3xx_id, },578	{ .compatible = "marvell,pxa93x-gpio",	.data = &pxa93x_id, },579	{ .compatible = "marvell,mmp-gpio",	.data = &mmp_id, },580	{ .compatible = "marvell,mmp2-gpio",	.data = &mmp2_id, },581	{ .compatible = "marvell,pxa1928-gpio",	.data = &pxa1928_id, },582	{}583};584 585static int pxa_gpio_probe_dt(struct platform_device *pdev,586			     struct pxa_gpio_chip *pchip)587{588	int nr_gpios;589	const struct pxa_gpio_id *gpio_id;590 591	gpio_id = of_device_get_match_data(&pdev->dev);592	gpio_type = gpio_id->type;593 594	nr_gpios = gpio_id->gpio_nums;595	pxa_last_gpio = nr_gpios - 1;596 597	irq_base = devm_irq_alloc_descs(&pdev->dev, -1, 0, nr_gpios, 0);598	if (irq_base < 0) {599		dev_err(&pdev->dev, "Failed to allocate IRQ numbers\n");600		return irq_base;601	}602	return irq_base;603}604#else605#define pxa_gpio_probe_dt(pdev, pchip)		(-1)606#endif607 608static int pxa_gpio_probe(struct platform_device *pdev)609{610	struct pxa_gpio_chip *pchip;611	struct pxa_gpio_bank *c;612	struct clk *clk;613	struct pxa_gpio_platform_data *info;614	void __iomem *gpio_reg_base;615	int gpio, ret;616	int irq0 = 0, irq1 = 0, irq_mux;617 618	pchip = devm_kzalloc(&pdev->dev, sizeof(*pchip), GFP_KERNEL);619	if (!pchip)620		return -ENOMEM;621	pchip->dev = &pdev->dev;622 623	info = dev_get_platdata(&pdev->dev);624	if (info) {625		irq_base = info->irq_base;626		if (irq_base <= 0)627			return -EINVAL;628		pxa_last_gpio = pxa_gpio_nums(pdev);629		pchip->set_wake = info->gpio_set_wake;630	} else {631		irq_base = pxa_gpio_probe_dt(pdev, pchip);632		if (irq_base < 0)633			return -EINVAL;634	}635 636	if (!pxa_last_gpio)637		return -EINVAL;638 639	pchip->irqdomain = irq_domain_add_legacy(pdev->dev.of_node,640						 pxa_last_gpio + 1, irq_base,641						 0, &pxa_irq_domain_ops, pchip);642	if (!pchip->irqdomain)643		return -ENOMEM;644 645	irq0 = platform_get_irq_byname_optional(pdev, "gpio0");646	irq1 = platform_get_irq_byname_optional(pdev, "gpio1");647	irq_mux = platform_get_irq_byname(pdev, "gpio_mux");648	if ((irq0 > 0 && irq1 <= 0) || (irq0 <= 0 && irq1 > 0)649		|| (irq_mux <= 0))650		return -EINVAL;651 652	pchip->irq0 = irq0;653	pchip->irq1 = irq1;654 655	gpio_reg_base = devm_platform_ioremap_resource(pdev, 0);656	if (IS_ERR(gpio_reg_base))657		return PTR_ERR(gpio_reg_base);658 659	clk = devm_clk_get_enabled(&pdev->dev, NULL);660	if (IS_ERR(clk)) {661		dev_err(&pdev->dev, "Error %ld to get gpio clock\n",662			PTR_ERR(clk));663		return PTR_ERR(clk);664	}665 666	/* Initialize GPIO chips */667	ret = pxa_init_gpio_chip(pchip, pxa_last_gpio + 1, gpio_reg_base);668	if (ret)669		return ret;670 671	/* clear all GPIO edge detects */672	for_each_gpio_bank(gpio, c, pchip) {673		writel_relaxed(0, c->regbase + GFER_OFFSET);674		writel_relaxed(0, c->regbase + GRER_OFFSET);675		writel_relaxed(~0, c->regbase + GEDR_OFFSET);676		/* unmask GPIO edge detect for AP side */677		if (gpio_is_mmp_type(gpio_type))678			writel_relaxed(~0, c->regbase + ED_MASK_OFFSET);679	}680 681	if (irq0 > 0) {682		ret = devm_request_irq(&pdev->dev,683				       irq0, pxa_gpio_direct_handler, 0,684				       "gpio-0", pchip);685		if (ret)686			dev_err(&pdev->dev, "request of gpio0 irq failed: %d\n",687				ret);688	}689	if (irq1 > 0) {690		ret = devm_request_irq(&pdev->dev,691				       irq1, pxa_gpio_direct_handler, 0,692				       "gpio-1", pchip);693		if (ret)694			dev_err(&pdev->dev, "request of gpio1 irq failed: %d\n",695				ret);696	}697	ret = devm_request_irq(&pdev->dev,698			       irq_mux, pxa_gpio_demux_handler, 0,699				       "gpio-mux", pchip);700	if (ret)701		dev_err(&pdev->dev, "request of gpio-mux irq failed: %d\n",702				ret);703 704	pxa_gpio_chip = pchip;705 706	return 0;707}708 709static const struct platform_device_id gpio_id_table[] = {710	{ "pxa25x-gpio",	(unsigned long)&pxa25x_id },711	{ "pxa26x-gpio",	(unsigned long)&pxa26x_id },712	{ "pxa27x-gpio",	(unsigned long)&pxa27x_id },713	{ "pxa3xx-gpio",	(unsigned long)&pxa3xx_id },714	{ "pxa93x-gpio",	(unsigned long)&pxa93x_id },715	{ "mmp-gpio",		(unsigned long)&mmp_id },716	{ "mmp2-gpio",		(unsigned long)&mmp2_id },717	{ "pxa1928-gpio",	(unsigned long)&pxa1928_id },718	{ },719};720 721static struct platform_driver pxa_gpio_driver = {722	.probe		= pxa_gpio_probe,723	.driver		= {724		.name	= "pxa-gpio",725		.of_match_table = of_match_ptr(pxa_gpio_dt_ids),726	},727	.id_table	= gpio_id_table,728};729 730static int __init pxa_gpio_legacy_init(void)731{732	if (of_have_populated_dt())733		return 0;734 735	return platform_driver_register(&pxa_gpio_driver);736}737postcore_initcall(pxa_gpio_legacy_init);738 739static int __init pxa_gpio_dt_init(void)740{741	if (of_have_populated_dt())742		return platform_driver_register(&pxa_gpio_driver);743 744	return 0;745}746device_initcall(pxa_gpio_dt_init);747 748#ifdef CONFIG_PM749static int pxa_gpio_suspend(void)750{751	struct pxa_gpio_chip *pchip = pxa_gpio_chip;752	struct pxa_gpio_bank *c;753	int gpio;754 755	if (!pchip)756		return 0;757 758	for_each_gpio_bank(gpio, c, pchip) {759		c->saved_gplr = readl_relaxed(c->regbase + GPLR_OFFSET);760		c->saved_gpdr = readl_relaxed(c->regbase + GPDR_OFFSET);761		c->saved_grer = readl_relaxed(c->regbase + GRER_OFFSET);762		c->saved_gfer = readl_relaxed(c->regbase + GFER_OFFSET);763 764		/* Clear GPIO transition detect bits */765		writel_relaxed(0xffffffff, c->regbase + GEDR_OFFSET);766	}767	return 0;768}769 770static void pxa_gpio_resume(void)771{772	struct pxa_gpio_chip *pchip = pxa_gpio_chip;773	struct pxa_gpio_bank *c;774	int gpio;775 776	if (!pchip)777		return;778 779	for_each_gpio_bank(gpio, c, pchip) {780		/* restore level with set/clear */781		writel_relaxed(c->saved_gplr, c->regbase + GPSR_OFFSET);782		writel_relaxed(~c->saved_gplr, c->regbase + GPCR_OFFSET);783 784		writel_relaxed(c->saved_grer, c->regbase + GRER_OFFSET);785		writel_relaxed(c->saved_gfer, c->regbase + GFER_OFFSET);786		writel_relaxed(c->saved_gpdr, c->regbase + GPDR_OFFSET);787	}788}789#else790#define pxa_gpio_suspend	NULL791#define pxa_gpio_resume		NULL792#endif793 794static struct syscore_ops pxa_gpio_syscore_ops = {795	.suspend	= pxa_gpio_suspend,796	.resume		= pxa_gpio_resume,797};798 799static int __init pxa_gpio_sysinit(void)800{801	register_syscore_ops(&pxa_gpio_syscore_ops);802	return 0;803}804postcore_initcall(pxa_gpio_sysinit);805