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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * Copyright (C) 2014-2017 Broadcom4 */5 6/*7 * This file contains the Broadcom Iproc GPIO driver that supports 38 * GPIO controllers on Iproc including the ASIU GPIO controller, the9 * chipCommonG GPIO controller, and the always-on GPIO controller. Basic10 * PINCONF such as bias pull up/down, and drive strength are also supported11 * in this driver.12 *13 * It provides the functionality where pins from the GPIO can be14 * individually muxed to GPIO function, if individual pad15 * configuration is supported, through the interaction with respective16 * SoCs IOMUX controller.17 */18 19#include <linux/gpio/driver.h>20#include <linux/interrupt.h>21#include <linux/io.h>22#include <linux/ioport.h>23#include <linux/kernel.h>24#include <linux/of.h>25#include <linux/platform_device.h>26#include <linux/seq_file.h>27#include <linux/slab.h>28 29#include <linux/pinctrl/consumer.h>30#include <linux/pinctrl/pinconf-generic.h>31#include <linux/pinctrl/pinconf.h>32#include <linux/pinctrl/pinctrl.h>33 34#include "../pinctrl-utils.h"35 36#define IPROC_GPIO_DATA_IN_OFFSET   0x0037#define IPROC_GPIO_DATA_OUT_OFFSET  0x0438#define IPROC_GPIO_OUT_EN_OFFSET    0x0839#define IPROC_GPIO_INT_TYPE_OFFSET  0x0c40#define IPROC_GPIO_INT_DE_OFFSET    0x1041#define IPROC_GPIO_INT_EDGE_OFFSET  0x1442#define IPROC_GPIO_INT_MSK_OFFSET   0x1843#define IPROC_GPIO_INT_STAT_OFFSET  0x1c44#define IPROC_GPIO_INT_MSTAT_OFFSET 0x2045#define IPROC_GPIO_INT_CLR_OFFSET   0x2446#define IPROC_GPIO_PAD_RES_OFFSET   0x3447#define IPROC_GPIO_RES_EN_OFFSET    0x3848 49/* drive strength control for ASIU GPIO */50#define IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET 0x5851 52/* pinconf for CCM GPIO */53#define IPROC_GPIO_PULL_DN_OFFSET   0x1054#define IPROC_GPIO_PULL_UP_OFFSET   0x1455 56/* pinconf for CRMU(aon) GPIO and CCM GPIO*/57#define IPROC_GPIO_DRV_CTRL_OFFSET  0x0058 59#define GPIO_BANK_SIZE 0x20060#define NGPIOS_PER_BANK 3261#define GPIO_BANK(pin) ((pin) / NGPIOS_PER_BANK)62 63#define IPROC_GPIO_REG(pin, reg) (GPIO_BANK(pin) * GPIO_BANK_SIZE + (reg))64#define IPROC_GPIO_SHIFT(pin) ((pin) % NGPIOS_PER_BANK)65 66#define GPIO_DRV_STRENGTH_BIT_SHIFT  2067#define GPIO_DRV_STRENGTH_BITS       368#define GPIO_DRV_STRENGTH_BIT_MASK   ((1 << GPIO_DRV_STRENGTH_BITS) - 1)69 70enum iproc_pinconf_param {71	IPROC_PINCONF_DRIVE_STRENGTH = 0,72	IPROC_PINCONF_BIAS_DISABLE,73	IPROC_PINCONF_BIAS_PULL_UP,74	IPROC_PINCONF_BIAS_PULL_DOWN,75	IPROC_PINCON_MAX,76};77 78enum iproc_pinconf_ctrl_type {79	IOCTRL_TYPE_AON = 1,80	IOCTRL_TYPE_CDRU,81	IOCTRL_TYPE_INVALID,82};83 84/*85 * Iproc GPIO core86 *87 * @dev: pointer to device88 * @base: I/O register base for Iproc GPIO controller89 * @io_ctrl: I/O register base for certain type of Iproc GPIO controller that90 * has the PINCONF support implemented outside of the GPIO block91 * @lock: lock to protect access to I/O registers92 * @gc: GPIO chip93 * @num_banks: number of GPIO banks, each bank supports up to 32 GPIOs94 * @pinmux_is_supported: flag to indicate this GPIO controller contains pins95 * that can be individually muxed to GPIO96 * @pinconf_disable: contains a list of PINCONF parameters that need to be97 * disabled98 * @nr_pinconf_disable: total number of PINCONF parameters that need to be99 * disabled100 * @pctl: pointer to pinctrl_dev101 * @pctldesc: pinctrl descriptor102 */103struct iproc_gpio {104	struct device *dev;105 106	void __iomem *base;107	void __iomem *io_ctrl;108	enum iproc_pinconf_ctrl_type io_ctrl_type;109 110	raw_spinlock_t lock;111 112	struct gpio_chip gc;113	unsigned num_banks;114 115	bool pinmux_is_supported;116 117	enum pin_config_param *pinconf_disable;118	unsigned int nr_pinconf_disable;119 120	struct pinctrl_dev *pctl;121	struct pinctrl_desc pctldesc;122};123 124/*125 * Mapping from PINCONF pins to GPIO pins is 1-to-1126 */127static inline unsigned iproc_pin_to_gpio(unsigned pin)128{129	return pin;130}131 132/**133 *  iproc_set_bit - set or clear one bit (corresponding to the GPIO pin) in a134 *  Iproc GPIO register135 *136 *  @chip: Iproc GPIO device137 *  @reg: register offset138 *  @gpio: GPIO pin139 *  @set: set or clear140 */141static inline void iproc_set_bit(struct iproc_gpio *chip, unsigned int reg,142				  unsigned gpio, bool set)143{144	unsigned int offset = IPROC_GPIO_REG(gpio, reg);145	unsigned int shift = IPROC_GPIO_SHIFT(gpio);146	u32 val;147 148	val = readl(chip->base + offset);149	if (set)150		val |= BIT(shift);151	else152		val &= ~BIT(shift);153	writel(val, chip->base + offset);154}155 156static inline bool iproc_get_bit(struct iproc_gpio *chip, unsigned int reg,157				  unsigned gpio)158{159	unsigned int offset = IPROC_GPIO_REG(gpio, reg);160	unsigned int shift = IPROC_GPIO_SHIFT(gpio);161 162	return !!(readl(chip->base + offset) & BIT(shift));163}164 165static void iproc_gpio_irq_handler(struct irq_desc *desc)166{167	struct gpio_chip *gc = irq_desc_get_handler_data(desc);168	struct iproc_gpio *chip = gpiochip_get_data(gc);169	struct irq_chip *irq_chip = irq_desc_get_chip(desc);170	int i, bit;171 172	chained_irq_enter(irq_chip, desc);173 174	/* go through the entire GPIO banks and handle all interrupts */175	for (i = 0; i < chip->num_banks; i++) {176		unsigned long val = readl(chip->base + (i * GPIO_BANK_SIZE) +177					  IPROC_GPIO_INT_MSTAT_OFFSET);178 179		for_each_set_bit(bit, &val, NGPIOS_PER_BANK) {180			unsigned pin = NGPIOS_PER_BANK * i + bit;181 182			/*183			 * Clear the interrupt before invoking the184			 * handler, so we do not leave any window185			 */186			writel(BIT(bit), chip->base + (i * GPIO_BANK_SIZE) +187			       IPROC_GPIO_INT_CLR_OFFSET);188 189			generic_handle_domain_irq(gc->irq.domain, pin);190		}191	}192 193	chained_irq_exit(irq_chip, desc);194}195 196 197static void iproc_gpio_irq_ack(struct irq_data *d)198{199	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);200	struct iproc_gpio *chip = gpiochip_get_data(gc);201	unsigned gpio = d->hwirq;202	unsigned int offset = IPROC_GPIO_REG(gpio,203			IPROC_GPIO_INT_CLR_OFFSET);204	unsigned int shift = IPROC_GPIO_SHIFT(gpio);205	u32 val = BIT(shift);206 207	writel(val, chip->base + offset);208}209 210/**211 *  iproc_gpio_irq_set_mask - mask/unmask a GPIO interrupt212 *213 *  @d: IRQ chip data214 *  @unmask: mask/unmask GPIO interrupt215 */216static void iproc_gpio_irq_set_mask(struct irq_data *d, bool unmask)217{218	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);219	struct iproc_gpio *chip = gpiochip_get_data(gc);220	unsigned gpio = irqd_to_hwirq(d);221 222	iproc_set_bit(chip, IPROC_GPIO_INT_MSK_OFFSET, gpio, unmask);223}224 225static void iproc_gpio_irq_mask(struct irq_data *d)226{227	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);228	struct iproc_gpio *chip = gpiochip_get_data(gc);229	unsigned long flags;230 231	raw_spin_lock_irqsave(&chip->lock, flags);232	iproc_gpio_irq_set_mask(d, false);233	raw_spin_unlock_irqrestore(&chip->lock, flags);234	gpiochip_disable_irq(gc, irqd_to_hwirq(d));235}236 237static void iproc_gpio_irq_unmask(struct irq_data *d)238{239	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);240	struct iproc_gpio *chip = gpiochip_get_data(gc);241	unsigned long flags;242 243	gpiochip_enable_irq(gc, irqd_to_hwirq(d));244	raw_spin_lock_irqsave(&chip->lock, flags);245	iproc_gpio_irq_set_mask(d, true);246	raw_spin_unlock_irqrestore(&chip->lock, flags);247}248 249static int iproc_gpio_irq_set_type(struct irq_data *d, unsigned int type)250{251	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);252	struct iproc_gpio *chip = gpiochip_get_data(gc);253	unsigned gpio = d->hwirq;254	bool level_triggered = false;255	bool dual_edge = false;256	bool rising_or_high = false;257	unsigned long flags;258 259	switch (type & IRQ_TYPE_SENSE_MASK) {260	case IRQ_TYPE_EDGE_RISING:261		rising_or_high = true;262		break;263 264	case IRQ_TYPE_EDGE_FALLING:265		break;266 267	case IRQ_TYPE_EDGE_BOTH:268		dual_edge = true;269		break;270 271	case IRQ_TYPE_LEVEL_HIGH:272		level_triggered = true;273		rising_or_high = true;274		break;275 276	case IRQ_TYPE_LEVEL_LOW:277		level_triggered = true;278		break;279 280	default:281		dev_err(chip->dev, "invalid GPIO IRQ type 0x%x\n",282			type);283		return -EINVAL;284	}285 286	raw_spin_lock_irqsave(&chip->lock, flags);287	iproc_set_bit(chip, IPROC_GPIO_INT_TYPE_OFFSET, gpio,288		       level_triggered);289	iproc_set_bit(chip, IPROC_GPIO_INT_DE_OFFSET, gpio, dual_edge);290	iproc_set_bit(chip, IPROC_GPIO_INT_EDGE_OFFSET, gpio,291		       rising_or_high);292 293	if (type & IRQ_TYPE_EDGE_BOTH)294		irq_set_handler_locked(d, handle_edge_irq);295	else296		irq_set_handler_locked(d, handle_level_irq);297 298	raw_spin_unlock_irqrestore(&chip->lock, flags);299 300	dev_dbg(chip->dev,301		"gpio:%u level_triggered:%d dual_edge:%d rising_or_high:%d\n",302		gpio, level_triggered, dual_edge, rising_or_high);303 304	return 0;305}306 307static void iproc_gpio_irq_print_chip(struct irq_data *d, struct seq_file *p)308{309	struct gpio_chip *gc = irq_data_get_irq_chip_data(d);310	struct iproc_gpio *chip = gpiochip_get_data(gc);311 312	seq_printf(p, dev_name(chip->dev));313}314 315static const struct irq_chip iproc_gpio_irq_chip = {316	.irq_ack = iproc_gpio_irq_ack,317	.irq_mask = iproc_gpio_irq_mask,318	.irq_unmask = iproc_gpio_irq_unmask,319	.irq_set_type = iproc_gpio_irq_set_type,320	.irq_enable = iproc_gpio_irq_unmask,321	.irq_disable = iproc_gpio_irq_mask,322	.irq_print_chip = iproc_gpio_irq_print_chip,323	.flags = IRQCHIP_IMMUTABLE,324	GPIOCHIP_IRQ_RESOURCE_HELPERS,325};326 327/*328 * Request the Iproc IOMUX pinmux controller to mux individual pins to GPIO329 */330static int iproc_gpio_request(struct gpio_chip *gc, unsigned offset)331{332	struct iproc_gpio *chip = gpiochip_get_data(gc);333 334	/* not all Iproc GPIO pins can be muxed individually */335	if (!chip->pinmux_is_supported)336		return 0;337 338	return pinctrl_gpio_request(gc, offset);339}340 341static void iproc_gpio_free(struct gpio_chip *gc, unsigned offset)342{343	struct iproc_gpio *chip = gpiochip_get_data(gc);344 345	if (!chip->pinmux_is_supported)346		return;347 348	pinctrl_gpio_free(gc, offset);349}350 351static int iproc_gpio_direction_input(struct gpio_chip *gc, unsigned gpio)352{353	struct iproc_gpio *chip = gpiochip_get_data(gc);354	unsigned long flags;355 356	raw_spin_lock_irqsave(&chip->lock, flags);357	iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, false);358	raw_spin_unlock_irqrestore(&chip->lock, flags);359 360	dev_dbg(chip->dev, "gpio:%u set input\n", gpio);361 362	return 0;363}364 365static int iproc_gpio_direction_output(struct gpio_chip *gc, unsigned gpio,366					int val)367{368	struct iproc_gpio *chip = gpiochip_get_data(gc);369	unsigned long flags;370 371	raw_spin_lock_irqsave(&chip->lock, flags);372	iproc_set_bit(chip, IPROC_GPIO_OUT_EN_OFFSET, gpio, true);373	iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));374	raw_spin_unlock_irqrestore(&chip->lock, flags);375 376	dev_dbg(chip->dev, "gpio:%u set output, value:%d\n", gpio, val);377 378	return 0;379}380 381static int iproc_gpio_get_direction(struct gpio_chip *gc, unsigned int gpio)382{383	struct iproc_gpio *chip = gpiochip_get_data(gc);384	unsigned int offset = IPROC_GPIO_REG(gpio, IPROC_GPIO_OUT_EN_OFFSET);385	unsigned int shift = IPROC_GPIO_SHIFT(gpio);386 387	if (readl(chip->base + offset) & BIT(shift))388		return GPIO_LINE_DIRECTION_OUT;389 390	return GPIO_LINE_DIRECTION_IN;391}392 393static void iproc_gpio_set(struct gpio_chip *gc, unsigned gpio, int val)394{395	struct iproc_gpio *chip = gpiochip_get_data(gc);396	unsigned long flags;397 398	raw_spin_lock_irqsave(&chip->lock, flags);399	iproc_set_bit(chip, IPROC_GPIO_DATA_OUT_OFFSET, gpio, !!(val));400	raw_spin_unlock_irqrestore(&chip->lock, flags);401 402	dev_dbg(chip->dev, "gpio:%u set, value:%d\n", gpio, val);403}404 405static int iproc_gpio_get(struct gpio_chip *gc, unsigned gpio)406{407	struct iproc_gpio *chip = gpiochip_get_data(gc);408	unsigned int offset = IPROC_GPIO_REG(gpio,409					      IPROC_GPIO_DATA_IN_OFFSET);410	unsigned int shift = IPROC_GPIO_SHIFT(gpio);411 412	return !!(readl(chip->base + offset) & BIT(shift));413}414 415/*416 * Mapping of the iProc PINCONF parameters to the generic pin configuration417 * parameters418 */419static const enum pin_config_param iproc_pinconf_disable_map[] = {420	[IPROC_PINCONF_DRIVE_STRENGTH] = PIN_CONFIG_DRIVE_STRENGTH,421	[IPROC_PINCONF_BIAS_DISABLE] = PIN_CONFIG_BIAS_DISABLE,422	[IPROC_PINCONF_BIAS_PULL_UP] = PIN_CONFIG_BIAS_PULL_UP,423	[IPROC_PINCONF_BIAS_PULL_DOWN] = PIN_CONFIG_BIAS_PULL_DOWN,424};425 426static bool iproc_pinconf_param_is_disabled(struct iproc_gpio *chip,427					    enum pin_config_param param)428{429	unsigned int i;430 431	if (!chip->nr_pinconf_disable)432		return false;433 434	for (i = 0; i < chip->nr_pinconf_disable; i++)435		if (chip->pinconf_disable[i] == param)436			return true;437 438	return false;439}440 441static int iproc_pinconf_disable_map_create(struct iproc_gpio *chip,442					    unsigned long disable_mask)443{444	unsigned int map_size = ARRAY_SIZE(iproc_pinconf_disable_map);445	unsigned int bit, nbits = 0;446 447	/* figure out total number of PINCONF parameters to disable */448	for_each_set_bit(bit, &disable_mask, map_size)449		nbits++;450 451	if (!nbits)452		return 0;453 454	/*455	 * Allocate an array to store PINCONF parameters that need to be456	 * disabled457	 */458	chip->pinconf_disable = devm_kcalloc(chip->dev, nbits,459					     sizeof(*chip->pinconf_disable),460					     GFP_KERNEL);461	if (!chip->pinconf_disable)462		return -ENOMEM;463 464	chip->nr_pinconf_disable = nbits;465 466	/* now store these parameters */467	nbits = 0;468	for_each_set_bit(bit, &disable_mask, map_size)469		chip->pinconf_disable[nbits++] = iproc_pinconf_disable_map[bit];470 471	return 0;472}473 474static int iproc_get_groups_count(struct pinctrl_dev *pctldev)475{476	return 1;477}478 479/*480 * Only one group: "gpio_grp", since this local pinctrl device only performs481 * GPIO specific PINCONF configurations482 */483static const char *iproc_get_group_name(struct pinctrl_dev *pctldev,484					 unsigned selector)485{486	return "gpio_grp";487}488 489static const struct pinctrl_ops iproc_pctrl_ops = {490	.get_groups_count = iproc_get_groups_count,491	.get_group_name = iproc_get_group_name,492	.dt_node_to_map = pinconf_generic_dt_node_to_map_pin,493	.dt_free_map = pinctrl_utils_free_map,494};495 496static int iproc_gpio_set_pull(struct iproc_gpio *chip, unsigned gpio,497				bool disable, bool pull_up)498{499	void __iomem *base;500	unsigned long flags;501	unsigned int shift;502	u32 val_1, val_2;503 504	raw_spin_lock_irqsave(&chip->lock, flags);505	if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) {506		base = chip->io_ctrl;507		shift = IPROC_GPIO_SHIFT(gpio);508 509		val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET);510		val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET);511		if (disable) {512			/* no pull-up or pull-down */513			val_1 &= ~BIT(shift);514			val_2 &= ~BIT(shift);515		} else if (pull_up) {516			val_1 |= BIT(shift);517			val_2 &= ~BIT(shift);518		} else {519			val_1 &= ~BIT(shift);520			val_2 |= BIT(shift);521		}522		writel(val_1, base + IPROC_GPIO_PULL_UP_OFFSET);523		writel(val_2, base + IPROC_GPIO_PULL_DN_OFFSET);524	} else {525		if (disable) {526			iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio,527				      false);528		} else {529			iproc_set_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio,530				      pull_up);531			iproc_set_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio,532				      true);533		}534	}535 536	raw_spin_unlock_irqrestore(&chip->lock, flags);537	dev_dbg(chip->dev, "gpio:%u set pullup:%d\n", gpio, pull_up);538 539	return 0;540}541 542static void iproc_gpio_get_pull(struct iproc_gpio *chip, unsigned gpio,543				 bool *disable, bool *pull_up)544{545	void __iomem *base;546	unsigned long flags;547	unsigned int shift;548	u32 val_1, val_2;549 550	raw_spin_lock_irqsave(&chip->lock, flags);551	if (chip->io_ctrl_type == IOCTRL_TYPE_CDRU) {552		base = chip->io_ctrl;553		shift = IPROC_GPIO_SHIFT(gpio);554 555		val_1 = readl(base + IPROC_GPIO_PULL_UP_OFFSET) & BIT(shift);556		val_2 = readl(base + IPROC_GPIO_PULL_DN_OFFSET) & BIT(shift);557 558		*pull_up = val_1 ? true : false;559		*disable = (val_1 | val_2) ? false : true;560 561	} else {562		*disable = !iproc_get_bit(chip, IPROC_GPIO_RES_EN_OFFSET, gpio);563		*pull_up = iproc_get_bit(chip, IPROC_GPIO_PAD_RES_OFFSET, gpio);564	}565	raw_spin_unlock_irqrestore(&chip->lock, flags);566}567 568#define DRV_STRENGTH_OFFSET(gpio, bit, type)  ((type) == IOCTRL_TYPE_AON ? \569	((2 - (bit)) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \570	((type) == IOCTRL_TYPE_CDRU) ? \571	((bit) * 4 + IPROC_GPIO_DRV_CTRL_OFFSET) : \572	((bit) * 4 + IPROC_GPIO_REG(gpio, IPROC_GPIO_ASIU_DRV0_CTRL_OFFSET)))573 574static int iproc_gpio_set_strength(struct iproc_gpio *chip, unsigned gpio,575				    unsigned strength)576{577	void __iomem *base;578	unsigned int i, offset, shift;579	u32 val;580	unsigned long flags;581 582	/* make sure drive strength is supported */583	if (strength < 2 ||  strength > 16 || (strength % 2))584		return -ENOTSUPP;585 586	if (chip->io_ctrl) {587		base = chip->io_ctrl;588	} else {589		base = chip->base;590	}591 592	shift = IPROC_GPIO_SHIFT(gpio);593 594	dev_dbg(chip->dev, "gpio:%u set drive strength:%d mA\n", gpio,595		strength);596 597	raw_spin_lock_irqsave(&chip->lock, flags);598	strength = (strength / 2) - 1;599	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {600		offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type);601		val = readl(base + offset);602		val &= ~BIT(shift);603		val |= ((strength >> i) & 0x1) << shift;604		writel(val, base + offset);605	}606	raw_spin_unlock_irqrestore(&chip->lock, flags);607 608	return 0;609}610 611static int iproc_gpio_get_strength(struct iproc_gpio *chip, unsigned gpio,612				    u16 *strength)613{614	void __iomem *base;615	unsigned int i, offset, shift;616	u32 val;617	unsigned long flags;618 619	if (chip->io_ctrl) {620		base = chip->io_ctrl;621	} else {622		base = chip->base;623	}624 625	shift = IPROC_GPIO_SHIFT(gpio);626 627	raw_spin_lock_irqsave(&chip->lock, flags);628	*strength = 0;629	for (i = 0; i < GPIO_DRV_STRENGTH_BITS; i++) {630		offset = DRV_STRENGTH_OFFSET(gpio, i, chip->io_ctrl_type);631		val = readl(base + offset) & BIT(shift);632		val >>= shift;633		*strength += (val << i);634	}635 636	/* convert to mA */637	*strength = (*strength + 1) * 2;638	raw_spin_unlock_irqrestore(&chip->lock, flags);639 640	return 0;641}642 643static int iproc_pin_config_get(struct pinctrl_dev *pctldev, unsigned pin,644				 unsigned long *config)645{646	struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);647	enum pin_config_param param = pinconf_to_config_param(*config);648	unsigned gpio = iproc_pin_to_gpio(pin);649	u16 arg;650	bool disable, pull_up;651	int ret;652 653	if (iproc_pinconf_param_is_disabled(chip, param))654		return -ENOTSUPP;655 656	switch (param) {657	case PIN_CONFIG_BIAS_DISABLE:658		iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);659		if (disable)660			return 0;661		else662			return -EINVAL;663 664	case PIN_CONFIG_BIAS_PULL_UP:665		iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);666		if (!disable && pull_up)667			return 0;668		else669			return -EINVAL;670 671	case PIN_CONFIG_BIAS_PULL_DOWN:672		iproc_gpio_get_pull(chip, gpio, &disable, &pull_up);673		if (!disable && !pull_up)674			return 0;675		else676			return -EINVAL;677 678	case PIN_CONFIG_DRIVE_STRENGTH:679		ret = iproc_gpio_get_strength(chip, gpio, &arg);680		if (ret)681			return ret;682		*config = pinconf_to_config_packed(param, arg);683 684		return 0;685 686	default:687		return -ENOTSUPP;688	}689 690	return -ENOTSUPP;691}692 693static int iproc_pin_config_set(struct pinctrl_dev *pctldev, unsigned pin,694				 unsigned long *configs, unsigned num_configs)695{696	struct iproc_gpio *chip = pinctrl_dev_get_drvdata(pctldev);697	enum pin_config_param param;698	u32 arg;699	unsigned i, gpio = iproc_pin_to_gpio(pin);700	int ret = -ENOTSUPP;701 702	for (i = 0; i < num_configs; i++) {703		param = pinconf_to_config_param(configs[i]);704 705		if (iproc_pinconf_param_is_disabled(chip, param))706			return -ENOTSUPP;707 708		arg = pinconf_to_config_argument(configs[i]);709 710		switch (param) {711		case PIN_CONFIG_BIAS_DISABLE:712			ret = iproc_gpio_set_pull(chip, gpio, true, false);713			if (ret < 0)714				goto out;715			break;716 717		case PIN_CONFIG_BIAS_PULL_UP:718			ret = iproc_gpio_set_pull(chip, gpio, false, true);719			if (ret < 0)720				goto out;721			break;722 723		case PIN_CONFIG_BIAS_PULL_DOWN:724			ret = iproc_gpio_set_pull(chip, gpio, false, false);725			if (ret < 0)726				goto out;727			break;728 729		case PIN_CONFIG_DRIVE_STRENGTH:730			ret = iproc_gpio_set_strength(chip, gpio, arg);731			if (ret < 0)732				goto out;733			break;734 735		default:736			dev_err(chip->dev, "invalid configuration\n");737			return -ENOTSUPP;738		}739	} /* for each config */740 741out:742	return ret;743}744 745static const struct pinconf_ops iproc_pconf_ops = {746	.is_generic = true,747	.pin_config_get = iproc_pin_config_get,748	.pin_config_set = iproc_pin_config_set,749};750 751/*752 * Iproc GPIO controller supports some PINCONF related configurations such as753 * pull up, pull down, and drive strength, when the pin is configured to GPIO754 *755 * Here a local pinctrl device is created with simple 1-to-1 pin mapping to the756 * local GPIO pins757 */758static int iproc_gpio_register_pinconf(struct iproc_gpio *chip)759{760	struct pinctrl_desc *pctldesc = &chip->pctldesc;761	struct pinctrl_pin_desc *pins;762	struct gpio_chip *gc = &chip->gc;763	int i;764 765	pins = devm_kcalloc(chip->dev, gc->ngpio, sizeof(*pins), GFP_KERNEL);766	if (!pins)767		return -ENOMEM;768 769	for (i = 0; i < gc->ngpio; i++) {770		pins[i].number = i;771		pins[i].name = devm_kasprintf(chip->dev, GFP_KERNEL,772					      "gpio-%d", i);773		if (!pins[i].name)774			return -ENOMEM;775	}776 777	pctldesc->name = dev_name(chip->dev);778	pctldesc->pctlops = &iproc_pctrl_ops;779	pctldesc->pins = pins;780	pctldesc->npins = gc->ngpio;781	pctldesc->confops = &iproc_pconf_ops;782 783	chip->pctl = devm_pinctrl_register(chip->dev, pctldesc, chip);784	if (IS_ERR(chip->pctl)) {785		dev_err(chip->dev, "unable to register pinctrl device\n");786		return PTR_ERR(chip->pctl);787	}788 789	return 0;790}791 792static const struct of_device_id iproc_gpio_of_match[] = {793	{ .compatible = "brcm,iproc-gpio" },794	{ .compatible = "brcm,cygnus-ccm-gpio" },795	{ .compatible = "brcm,cygnus-asiu-gpio" },796	{ .compatible = "brcm,cygnus-crmu-gpio" },797	{ .compatible = "brcm,iproc-nsp-gpio" },798	{ .compatible = "brcm,iproc-stingray-gpio" },799	{ /* sentinel */ }800};801 802static int iproc_gpio_probe(struct platform_device *pdev)803{804	struct device *dev = &pdev->dev;805	struct resource *res;806	struct iproc_gpio *chip;807	struct gpio_chip *gc;808	u32 ngpios, pinconf_disable_mask = 0;809	int irq, ret;810	bool no_pinconf = false;811	enum iproc_pinconf_ctrl_type io_ctrl_type = IOCTRL_TYPE_INVALID;812 813	/* NSP does not support drive strength config */814	if (of_device_is_compatible(dev->of_node, "brcm,iproc-nsp-gpio"))815		pinconf_disable_mask = BIT(IPROC_PINCONF_DRIVE_STRENGTH);816	/* Stingray does not support pinconf in this controller */817	else if (of_device_is_compatible(dev->of_node,818					 "brcm,iproc-stingray-gpio"))819		no_pinconf = true;820 821	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);822	if (!chip)823		return -ENOMEM;824 825	chip->dev = dev;826	platform_set_drvdata(pdev, chip);827 828	chip->base = devm_platform_ioremap_resource(pdev, 0);829	if (IS_ERR(chip->base)) {830		dev_err(dev, "unable to map I/O memory\n");831		return PTR_ERR(chip->base);832	}833 834	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);835	if (res) {836		chip->io_ctrl = devm_ioremap_resource(dev, res);837		if (IS_ERR(chip->io_ctrl))838			return PTR_ERR(chip->io_ctrl);839		if (of_device_is_compatible(dev->of_node,840					    "brcm,cygnus-ccm-gpio"))841			io_ctrl_type = IOCTRL_TYPE_CDRU;842		else843			io_ctrl_type = IOCTRL_TYPE_AON;844	}845 846	chip->io_ctrl_type = io_ctrl_type;847 848	if (of_property_read_u32(dev->of_node, "ngpios", &ngpios)) {849		dev_err(&pdev->dev, "missing ngpios DT property\n");850		return -ENODEV;851	}852 853	raw_spin_lock_init(&chip->lock);854 855	gc = &chip->gc;856	gc->base = -1;857	gc->ngpio = ngpios;858	chip->num_banks = (ngpios + NGPIOS_PER_BANK - 1) / NGPIOS_PER_BANK;859	gc->label = dev_name(dev);860	gc->parent = dev;861	gc->request = iproc_gpio_request;862	gc->free = iproc_gpio_free;863	gc->direction_input = iproc_gpio_direction_input;864	gc->direction_output = iproc_gpio_direction_output;865	gc->get_direction = iproc_gpio_get_direction;866	gc->set = iproc_gpio_set;867	gc->get = iproc_gpio_get;868 869	chip->pinmux_is_supported = of_property_read_bool(dev->of_node,870							"gpio-ranges");871 872	/* optional GPIO interrupt support */873	irq = platform_get_irq_optional(pdev, 0);874	if (irq > 0) {875		struct gpio_irq_chip *girq;876 877		girq = &gc->irq;878		gpio_irq_chip_set_chip(girq, &iproc_gpio_irq_chip);879		girq->parent_handler = iproc_gpio_irq_handler;880		girq->num_parents = 1;881		girq->parents = devm_kcalloc(dev, 1,882					     sizeof(*girq->parents),883					     GFP_KERNEL);884		if (!girq->parents)885			return -ENOMEM;886		girq->parents[0] = irq;887		girq->default_type = IRQ_TYPE_NONE;888		girq->handler = handle_bad_irq;889	}890 891	ret = gpiochip_add_data(gc, chip);892	if (ret < 0)893		return dev_err_probe(dev, ret, "unable to add GPIO chip\n");894 895	if (!no_pinconf) {896		ret = iproc_gpio_register_pinconf(chip);897		if (ret) {898			dev_err(dev, "unable to register pinconf\n");899			goto err_rm_gpiochip;900		}901 902		if (pinconf_disable_mask) {903			ret = iproc_pinconf_disable_map_create(chip,904							 pinconf_disable_mask);905			if (ret) {906				dev_err(dev,907					"unable to create pinconf disable map\n");908				goto err_rm_gpiochip;909			}910		}911	}912 913	return 0;914 915err_rm_gpiochip:916	gpiochip_remove(gc);917 918	return ret;919}920 921static struct platform_driver iproc_gpio_driver = {922	.driver = {923		.name = "iproc-gpio",924		.of_match_table = iproc_gpio_of_match,925	},926	.probe = iproc_gpio_probe,927};928 929static int __init iproc_gpio_init(void)930{931	return platform_driver_register(&iproc_gpio_driver);932}933arch_initcall_sync(iproc_gpio_init);934