[linux-2.6-block.git] / drivers / gpio / gpio-stp-xway.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 *
 *  Copyright (C) 2012 John Crispin <john@phrozen.org>
 */

#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/of.h>
#include <linux/mutex.h>
#include <linux/gpio/driver.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/err.h>

/*
 * The Serial To Parallel (STP) is found on MIPS based Lantiq socs. It is a
 * peripheral controller used to drive external shift register cascades. At most
 * 3 groups of 8 bits can be driven. The hardware is able to allow the DSL modem
 * to drive the 2 LSBs of the cascade automatically.
 */

/* control register 0 */
#define XWAY_STP_CON0		0x00
/* control register 1 */
#define XWAY_STP_CON1		0x04
/* data register 0 */
#define XWAY_STP_CPU0		0x08
/* data register 1 */
#define XWAY_STP_CPU1		0x0C
/* access register */
#define XWAY_STP_AR		0x10

/* software or hardware update select bit */
#define XWAY_STP_CON_SWU	BIT(31)

/* automatic update rates */
#define XWAY_STP_2HZ		0
#define XWAY_STP_4HZ		BIT(23)
#define XWAY_STP_8HZ		BIT(24)
#define XWAY_STP_10HZ		(BIT(24) | BIT(23))
#define XWAY_STP_SPEED_MASK	(BIT(23) | BIT(24) | BIT(25) | BIT(26) | BIT(27))

#define XWAY_STP_FPIS_VALUE	BIT(21)
#define XWAY_STP_FPIS_MASK	(BIT(20) | BIT(21))

/* clock source for automatic update */
#define XWAY_STP_UPD_FPI	BIT(31)
#define XWAY_STP_UPD_MASK	(BIT(31) | BIT(30))

/* let the adsl core drive the 2 LSBs */
#define XWAY_STP_ADSL_SHIFT	24
#define XWAY_STP_ADSL_MASK	0x3

/* 2 groups of 3 bits can be driven by the phys */
#define XWAY_STP_PHY_MASK	0x7
#define XWAY_STP_PHY1_SHIFT	27
#define XWAY_STP_PHY2_SHIFT	3
#define XWAY_STP_PHY3_SHIFT	6
#define XWAY_STP_PHY4_SHIFT	15

/* STP has 3 groups of 8 bits */
#define XWAY_STP_GROUP0		BIT(0)
#define XWAY_STP_GROUP1		BIT(1)
#define XWAY_STP_GROUP2		BIT(2)
#define XWAY_STP_GROUP_MASK	(0x7)

/* Edge configuration bits */
#define XWAY_STP_FALLING	BIT(26)
#define XWAY_STP_EDGE_MASK	BIT(26)

#define xway_stp_r32(m, reg)		__raw_readl(m + reg)
#define xway_stp_w32(m, val, reg)	__raw_writel(val, m + reg)
#define xway_stp_w32_mask(m, clear, set, reg) \
		xway_stp_w32(m, (xway_stp_r32(m, reg) & ~(clear)) | (set), reg)

struct xway_stp {
	struct gpio_chip gc;
	void __iomem *virt;
	u32 edge;	/* rising or falling edge triggered shift register */
	u32 shadow;	/* shadow the shift registers state */
	u8 groups;	/* we can drive 1-3 groups of 8bit each */
	u8 dsl;		/* the 2 LSBs can be driven by the dsl core */
	u8 phy1;	/* 3 bits can be driven by phy1 */
	u8 phy2;	/* 3 bits can be driven by phy2 */
	u8 phy3;	/* 3 bits can be driven by phy3 */
	u8 phy4;	/* 3 bits can be driven by phy4 */
	u8 reserved;	/* mask out the hw driven bits in gpio_request */
};

/**
 * xway_stp_get() - gpio_chip->get - get gpios.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 *
 * Gets the shadow value.
 */
static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio)
{
	struct xway_stp *chip = gpiochip_get_data(gc);

	return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio));
}

/**
 * xway_stp_set() - gpio_chip->set - set gpios.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 * @val:    Value to be written to specified signal.
 *
 * Set the shadow value and call ltq_ebu_apply.
 */
static void xway_stp_set(struct gpio_chip *gc, unsigned gpio, int val)
{
	struct xway_stp *chip = gpiochip_get_data(gc);

	if (val)
		chip->shadow |= BIT(gpio);
	else
		chip->shadow &= ~BIT(gpio);
	xway_stp_w32(chip->virt, chip->shadow, XWAY_STP_CPU0);
	if (!chip->reserved)
		xway_stp_w32_mask(chip->virt, 0, XWAY_STP_CON_SWU, XWAY_STP_CON0);
}

/**
 * xway_stp_dir_out() - gpio_chip->dir_out - set gpio direction.
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 * @val:    Value to be written to specified signal.
 *
 * Same as xway_stp_set, always returns 0.
 */
static int xway_stp_dir_out(struct gpio_chip *gc, unsigned gpio, int val)
{
	xway_stp_set(gc, gpio, val);

	return 0;
}

/**
 * xway_stp_request() - gpio_chip->request
 * @gc:     Pointer to gpio_chip device structure.
 * @gpio:   GPIO signal number.
 *
 * We mask out the HW driven pins
 */
static int xway_stp_request(struct gpio_chip *gc, unsigned gpio)
{
	struct xway_stp *chip = gpiochip_get_data(gc);

	if ((gpio < 8) && (chip->reserved & BIT(gpio))) {
		dev_err(gc->parent, "GPIO %d is driven by hardware\n", gpio);
		return -ENODEV;
	}

	return 0;
}

/**
 * xway_stp_hw_init() - Configure the STP unit and enable the clock gate
 * @chip: Pointer to the xway_stp chip structure
 */
static void xway_stp_hw_init(struct xway_stp *chip)
{
	/* sane defaults */
	xway_stp_w32(chip->virt, 0, XWAY_STP_AR);
	xway_stp_w32(chip->virt, 0, XWAY_STP_CPU0);
	xway_stp_w32(chip->virt, 0, XWAY_STP_CPU1);
	xway_stp_w32(chip->virt, XWAY_STP_CON_SWU, XWAY_STP_CON0);
	xway_stp_w32(chip->virt, 0, XWAY_STP_CON1);

	/* apply edge trigger settings for the shift register */
	xway_stp_w32_mask(chip->virt, XWAY_STP_EDGE_MASK,
				chip->edge, XWAY_STP_CON0);

	/* apply led group settings */
	xway_stp_w32_mask(chip->virt, XWAY_STP_GROUP_MASK,
				chip->groups, XWAY_STP_CON1);

	/* tell the hardware which pins are controlled by the dsl modem */
	xway_stp_w32_mask(chip->virt,
			XWAY_STP_ADSL_MASK << XWAY_STP_ADSL_SHIFT,
			chip->dsl << XWAY_STP_ADSL_SHIFT,
			XWAY_STP_CON0);

	/* tell the hardware which pins are controlled by the phys */
	xway_stp_w32_mask(chip->virt,
			XWAY_STP_PHY_MASK << XWAY_STP_PHY1_SHIFT,
			chip->phy1 << XWAY_STP_PHY1_SHIFT,
			XWAY_STP_CON0);
	xway_stp_w32_mask(chip->virt,
			XWAY_STP_PHY_MASK << XWAY_STP_PHY2_SHIFT,
			chip->phy2 << XWAY_STP_PHY2_SHIFT,
			XWAY_STP_CON1);

	if (of_machine_is_compatible("lantiq,grx390")
	    || of_machine_is_compatible("lantiq,ar10")) {
		xway_stp_w32_mask(chip->virt,
				XWAY_STP_PHY_MASK << XWAY_STP_PHY3_SHIFT,
				chip->phy3 << XWAY_STP_PHY3_SHIFT,
				XWAY_STP_CON1);
	}

	if (of_machine_is_compatible("lantiq,grx390")) {
		xway_stp_w32_mask(chip->virt,
				XWAY_STP_PHY_MASK << XWAY_STP_PHY4_SHIFT,
				chip->phy4 << XWAY_STP_PHY4_SHIFT,
				XWAY_STP_CON1);
	}

	/* mask out the hw driven bits in gpio_request */
	chip->reserved = (chip->phy4 << 11) | (chip->phy3 << 8) | (chip->phy2 << 5)
		| (chip->phy1 << 2) | chip->dsl;

	/*
	 * if we have pins that are driven by hw, we need to tell the stp what
	 * clock to use as a timer.
	 */
	if (chip->reserved) {
		xway_stp_w32_mask(chip->virt, XWAY_STP_UPD_MASK,
			XWAY_STP_UPD_FPI, XWAY_STP_CON1);
		xway_stp_w32_mask(chip->virt, XWAY_STP_SPEED_MASK,
			XWAY_STP_10HZ, XWAY_STP_CON1);
		xway_stp_w32_mask(chip->virt, XWAY_STP_FPIS_MASK,
			XWAY_STP_FPIS_VALUE, XWAY_STP_CON1);
	}
}

static int xway_stp_probe(struct platform_device *pdev)
{
	u32 shadow, groups, dsl, phy;
	struct xway_stp *chip;
	struct clk *clk;
	int ret = 0;

	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->virt = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(chip->virt))
		return PTR_ERR(chip->virt);

	chip->gc.parent = &pdev->dev;
	chip->gc.label = "stp-xway";
	chip->gc.direction_output = xway_stp_dir_out;
	chip->gc.get = xway_stp_get;
	chip->gc.set = xway_stp_set;
	chip->gc.request = xway_stp_request;
	chip->gc.base = -1;
	chip->gc.owner = THIS_MODULE;

	/* store the shadow value if one was passed by the devicetree */
	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,shadow", &shadow))
		chip->shadow = shadow;

	/* find out which gpio groups should be enabled */
	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,groups", &groups))
		chip->groups = groups & XWAY_STP_GROUP_MASK;
	else
		chip->groups = XWAY_STP_GROUP0;
	chip->gc.ngpio = fls(chip->groups) * 8;

	/* find out which gpios are controlled by the dsl core */
	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,dsl", &dsl))
		chip->dsl = dsl & XWAY_STP_ADSL_MASK;

	/* find out which gpios are controlled by the phys */
	if (of_machine_is_compatible("lantiq,ar9") ||
			of_machine_is_compatible("lantiq,gr9") ||
			of_machine_is_compatible("lantiq,vr9") ||
			of_machine_is_compatible("lantiq,ar10") ||
			of_machine_is_compatible("lantiq,grx390")) {
		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy1", &phy))
			chip->phy1 = phy & XWAY_STP_PHY_MASK;
		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy2", &phy))
			chip->phy2 = phy & XWAY_STP_PHY_MASK;
	}

	if (of_machine_is_compatible("lantiq,ar10") ||
			of_machine_is_compatible("lantiq,grx390")) {
		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy3", &phy))
			chip->phy3 = phy & XWAY_STP_PHY_MASK;
	}

	if (of_machine_is_compatible("lantiq,grx390")) {
		if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy4", &phy))
			chip->phy4 = phy & XWAY_STP_PHY_MASK;
	}

	/* check which edge trigger we should use, default to a falling edge */
	if (!of_property_read_bool(pdev->dev.of_node, "lantiq,rising"))
		chip->edge = XWAY_STP_FALLING;

	clk = devm_clk_get(&pdev->dev, NULL);
	if (IS_ERR(clk)) {
		dev_err(&pdev->dev, "Failed to get clock\n");
		return PTR_ERR(clk);
	}

	ret = clk_prepare_enable(clk);
	if (ret)
		return ret;

	xway_stp_hw_init(chip);

	ret = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
	if (ret) {
		clk_disable_unprepare(clk);
		return ret;
	}

	dev_info(&pdev->dev, "Init done\n");

	return 0;
}

static const struct of_device_id xway_stp_match[] = {
	{ .compatible = "lantiq,gpio-stp-xway" },
	{},
};
MODULE_DEVICE_TABLE(of, xway_stp_match);

static struct platform_driver xway_stp_driver = {
	.probe = xway_stp_probe,
	.driver = {
		.name = "gpio-stp-xway",
		.of_match_table = xway_stp_match,
	},
};

static int __init xway_stp_init(void)
{
	return platform_driver_register(&xway_stp_driver);
}

subsys_initcall(xway_stp_init);
Commit	Line	Data
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
935c500c	2	/*
935c500c	3	*
baddc7ca	4	* Copyright (C) 2012 John Crispin <john@phrozen.org>
935c500c JC	5	*/
935c500c JC	6
e91d0f05	7	#include <linux/platform_device.h>
935c500c JC	8	#include <linux/slab.h>
935c500c JC	9	#include <linux/init.h>
54f30066	10	#include <linux/module.h>
935c500c	11	#include <linux/types.h>
e91d0f05	12	#include <linux/of.h>
935c500c	13	#include <linux/mutex.h>
97a48fcd	14	#include <linux/gpio/driver.h>
54f30066	15	#include <linux/io.h>
54f30066 JC	16	#include <linux/clk.h>
54f30066 JC	17	#include <linux/err.h>
935c500c	18
54f30066 JC	19	/*
	20	* The Serial To Parallel (STP) is found on MIPS based Lantiq socs. It is a
	21	* peripheral controller used to drive external shift register cascades. At most
	22	* 3 groups of 8 bits can be driven. The hardware is able to allow the DSL modem
	23	* to drive the 2 LSBs of the cascade automatically.
	24	*/
	25
	26	/* control register 0 */
	27	#define XWAY_STP_CON0 0x00
	28	/* control register 1 */
	29	#define XWAY_STP_CON1 0x04
	30	/* data register 0 */
	31	#define XWAY_STP_CPU0 0x08
	32	/* data register 1 */
	33	#define XWAY_STP_CPU1 0x0C
	34	/* access register */
	35	#define XWAY_STP_AR 0x10
	36
	37	/* software or hardware update select bit */
	38	#define XWAY_STP_CON_SWU BIT(31)
	39
	40	/* automatic update rates */
	41	#define XWAY_STP_2HZ 0
	42	#define XWAY_STP_4HZ BIT(23)
	43	#define XWAY_STP_8HZ BIT(24)
	44	#define XWAY_STP_10HZ (BIT(24) \| BIT(23))
329afb94 AJB	45	#define XWAY_STP_SPEED_MASK (BIT(23) \| BIT(24) \| BIT(25) \| BIT(26) \| BIT(27))
	46
	47	#define XWAY_STP_FPIS_VALUE BIT(21)
	48	#define XWAY_STP_FPIS_MASK (BIT(20) \| BIT(21))
54f30066 JC	49
	50	/* clock source for automatic update */
	51	#define XWAY_STP_UPD_FPI BIT(31)
	52	#define XWAY_STP_UPD_MASK (BIT(31) \| BIT(30))
	53
	54	/* let the adsl core drive the 2 LSBs */
	55	#define XWAY_STP_ADSL_SHIFT 24
	56	#define XWAY_STP_ADSL_MASK 0x3
	57
	58	/* 2 groups of 3 bits can be driven by the phys */
08b085a0	59	#define XWAY_STP_PHY_MASK 0x7
54f30066	60	#define XWAY_STP_PHY1_SHIFT 27
329afb94 AJB	61	#define XWAY_STP_PHY2_SHIFT 3
	62	#define XWAY_STP_PHY3_SHIFT 6
	63	#define XWAY_STP_PHY4_SHIFT 15
54f30066 JC	64
	65	/* STP has 3 groups of 8 bits */
	66	#define XWAY_STP_GROUP0 BIT(0)
	67	#define XWAY_STP_GROUP1 BIT(1)
	68	#define XWAY_STP_GROUP2 BIT(2)
	69	#define XWAY_STP_GROUP_MASK (0x7)
	70
	71	/* Edge configuration bits */
	72	#define XWAY_STP_FALLING BIT(26)
	73	#define XWAY_STP_EDGE_MASK BIT(26)
	74
	75	#define xway_stp_r32(m, reg) __raw_readl(m + reg)
	76	#define xway_stp_w32(m, val, reg) __raw_writel(val, m + reg)
	77	#define xway_stp_w32_mask(m, clear, set, reg) \
c0ec7012	78	xway_stp_w32(m, (xway_stp_r32(m, reg) & ~(clear)) \| (set), reg)
54f30066 JC	79
	80	struct xway_stp {
	81	struct gpio_chip gc;
	82	void __iomem *virt;
	83	u32 edge; /* rising or falling edge triggered shift register */
c9e854cf	84	u32 shadow; /* shadow the shift registers state */
54f30066 JC	85	u8 groups; /* we can drive 1-3 groups of 8bit each */
	86	u8 dsl; /* the 2 LSBs can be driven by the dsl core */
	87	u8 phy1; /* 3 bits can be driven by phy1 */
	88	u8 phy2; /* 3 bits can be driven by phy2 */
329afb94 AJB	89	u8 phy3; /* 3 bits can be driven by phy3 */
329afb94 AJB	90	u8 phy4; /* 3 bits can be driven by phy4 */
54f30066 JC	91	u8 reserved; /* mask out the hw driven bits in gpio_request */
	92	};
	93
5b9b2b52 MK	94	/**
	95	* xway_stp_get() - gpio_chip->get - get gpios.
	96	* @gc: Pointer to gpio_chip device structure.
	97	* @gpio: GPIO signal number.
	98	*
	99	* Gets the shadow value.
	100	*/
	101	static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio)
	102	{
	103	struct xway_stp *chip = gpiochip_get_data(gc);
	104
	105	return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio));
	106	}
	107
54f30066 JC	108	/**
	109	* xway_stp_set() - gpio_chip->set - set gpios.
	110	* @gc: Pointer to gpio_chip device structure.
	111	* @gpio: GPIO signal number.
	112	* @val: Value to be written to specified signal.
	113	*
	114	* Set the shadow value and call ltq_ebu_apply.
	115	*/
	116	static void xway_stp_set(struct gpio_chip *gc, unsigned gpio, int val)
935c500c	117	{
c63b30b0	118	struct xway_stp *chip = gpiochip_get_data(gc);
54f30066 JC	119
	120	if (val)
	121	chip->shadow \|= BIT(gpio);
935c500c	122	else
54f30066 JC	123	chip->shadow &= ~BIT(gpio);
54f30066 JC	124	xway_stp_w32(chip->virt, chip->shadow, XWAY_STP_CPU0);
329afb94 AJB	125	if (!chip->reserved)
329afb94 AJB	126	xway_stp_w32_mask(chip->virt, 0, XWAY_STP_CON_SWU, XWAY_STP_CON0);
935c500c JC	127	}
935c500c JC	128
54f30066 JC	129	/**
	130	* xway_stp_dir_out() - gpio_chip->dir_out - set gpio direction.
	131	* @gc: Pointer to gpio_chip device structure.
	132	* @gpio: GPIO signal number.
	133	* @val: Value to be written to specified signal.
	134	*
	135	* Same as xway_stp_set, always returns 0.
	136	*/
	137	static int xway_stp_dir_out(struct gpio_chip *gc, unsigned gpio, int val)
935c500c	138	{
54f30066	139	xway_stp_set(gc, gpio, val);
935c500c JC	140
	141	return 0;
	142	}
	143
54f30066 JC	144	/**
	145	* xway_stp_request() - gpio_chip->request
	146	* @gc: Pointer to gpio_chip device structure.
	147	* @gpio: GPIO signal number.
	148	*
	149	* We mask out the HW driven pins
	150	*/
	151	static int xway_stp_request(struct gpio_chip *gc, unsigned gpio)
	152	{
c63b30b0	153	struct xway_stp *chip = gpiochip_get_data(gc);
54f30066 JC	154
54f30066 JC	155	if ((gpio < 8) && (chip->reserved & BIT(gpio))) {
58383c78	156	dev_err(gc->parent, "GPIO %d is driven by hardware\n", gpio);
54f30066 JC	157	return -ENODEV;
54f30066 JC	158	}
935c500c	159
54f30066 JC	160	return 0;
	161	}
	162
	163	/**
	164	* xway_stp_hw_init() - Configure the STP unit and enable the clock gate
8a7b1797	165	* @chip: Pointer to the xway_stp chip structure
54f30066	166	*/
8a7b1797	167	static void xway_stp_hw_init(struct xway_stp *chip)
935c500c	168	{
935c500c	169	/* sane defaults */
54f30066 JC	170	xway_stp_w32(chip->virt, 0, XWAY_STP_AR);
	171	xway_stp_w32(chip->virt, 0, XWAY_STP_CPU0);
	172	xway_stp_w32(chip->virt, 0, XWAY_STP_CPU1);
	173	xway_stp_w32(chip->virt, XWAY_STP_CON_SWU, XWAY_STP_CON0);
	174	xway_stp_w32(chip->virt, 0, XWAY_STP_CON1);
935c500c	175
54f30066 JC	176	/* apply edge trigger settings for the shift register */
	177	xway_stp_w32_mask(chip->virt, XWAY_STP_EDGE_MASK,
	178	chip->edge, XWAY_STP_CON0);
935c500c	179
54f30066 JC	180	/* apply led group settings */
	181	xway_stp_w32_mask(chip->virt, XWAY_STP_GROUP_MASK,
	182	chip->groups, XWAY_STP_CON1);
935c500c	183
54f30066 JC	184	/* tell the hardware which pins are controlled by the dsl modem */
	185	xway_stp_w32_mask(chip->virt,
	186	XWAY_STP_ADSL_MASK << XWAY_STP_ADSL_SHIFT,
	187	chip->dsl << XWAY_STP_ADSL_SHIFT,
	188	XWAY_STP_CON0);
935c500c	189
54f30066 JC	190	/* tell the hardware which pins are controlled by the phys */
	191	xway_stp_w32_mask(chip->virt,
	192	XWAY_STP_PHY_MASK << XWAY_STP_PHY1_SHIFT,
	193	chip->phy1 << XWAY_STP_PHY1_SHIFT,
	194	XWAY_STP_CON0);
	195	xway_stp_w32_mask(chip->virt,
	196	XWAY_STP_PHY_MASK << XWAY_STP_PHY2_SHIFT,
	197	chip->phy2 << XWAY_STP_PHY2_SHIFT,
	198	XWAY_STP_CON1);
935c500c	199
329afb94 AJB	200	if (of_machine_is_compatible("lantiq,grx390")
	201	\|\| of_machine_is_compatible("lantiq,ar10")) {
	202	xway_stp_w32_mask(chip->virt,
	203	XWAY_STP_PHY_MASK << XWAY_STP_PHY3_SHIFT,
	204	chip->phy3 << XWAY_STP_PHY3_SHIFT,
	205	XWAY_STP_CON1);
	206	}
	207
	208	if (of_machine_is_compatible("lantiq,grx390")) {
	209	xway_stp_w32_mask(chip->virt,
	210	XWAY_STP_PHY_MASK << XWAY_STP_PHY4_SHIFT,
	211	chip->phy4 << XWAY_STP_PHY4_SHIFT,
	212	XWAY_STP_CON1);
	213	}
	214
54f30066	215	/* mask out the hw driven bits in gpio_request */
329afb94 AJB	216	chip->reserved = (chip->phy4 << 11) \| (chip->phy3 << 8) \| (chip->phy2 << 5)
329afb94 AJB	217	\| (chip->phy1 << 2) \| chip->dsl;
54f30066 JC	218
	219	/*
	220	* if we have pins that are driven by hw, we need to tell the stp what
	221	* clock to use as a timer.
935c500c	222	*/
329afb94	223	if (chip->reserved) {
54f30066 JC	224	xway_stp_w32_mask(chip->virt, XWAY_STP_UPD_MASK,
54f30066 JC	225	XWAY_STP_UPD_FPI, XWAY_STP_CON1);
329afb94 AJB	226	xway_stp_w32_mask(chip->virt, XWAY_STP_SPEED_MASK,
	227	XWAY_STP_10HZ, XWAY_STP_CON1);
	228	xway_stp_w32_mask(chip->virt, XWAY_STP_FPIS_MASK,
	229	XWAY_STP_FPIS_VALUE, XWAY_STP_CON1);
	230	}
935c500c JC	231	}
935c500c JC	232
3836309d	233	static int xway_stp_probe(struct platform_device *pdev)
935c500c	234	{
50f09073	235	u32 shadow, groups, dsl, phy;
54f30066 JC	236	struct xway_stp *chip;
54f30066 JC	237	struct clk *clk;
935c500c JC	238	int ret = 0;
935c500c JC	239
54f30066 JC	240	chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
	241	if (!chip)
	242	return -ENOMEM;
	243
6ba7c53b	244	chip->virt = devm_platform_ioremap_resource(pdev, 0);
641d0342 TR	245	if (IS_ERR(chip->virt))
641d0342 TR	246	return PTR_ERR(chip->virt);
8ab2a6d2	247
58383c78	248	chip->gc.parent = &pdev->dev;
54f30066 JC	249	chip->gc.label = "stp-xway";
54f30066 JC	250	chip->gc.direction_output = xway_stp_dir_out;
5b9b2b52	251	chip->gc.get = xway_stp_get;
54f30066 JC	252	chip->gc.set = xway_stp_set;
	253	chip->gc.request = xway_stp_request;
	254	chip->gc.base = -1;
	255	chip->gc.owner = THIS_MODULE;
	256
	257	/* store the shadow value if one was passed by the devicetree */
50f09073 MB	258	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,shadow", &shadow))
50f09073 MB	259	chip->shadow = shadow;
54f30066 JC	260
54f30066 JC	261	/* find out which gpio groups should be enabled */
50f09073 MB	262	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,groups", &groups))
50f09073 MB	263	chip->groups = groups & XWAY_STP_GROUP_MASK;
54f30066 JC	264	else
	265	chip->groups = XWAY_STP_GROUP0;
	266	chip->gc.ngpio = fls(chip->groups) * 8;
	267
	268	/* find out which gpios are controlled by the dsl core */
50f09073 MB	269	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,dsl", &dsl))
50f09073 MB	270	chip->dsl = dsl & XWAY_STP_ADSL_MASK;
54f30066 JC	271
	272	/* find out which gpios are controlled by the phys */
	273	if (of_machine_is_compatible("lantiq,ar9") \|\|
	274	of_machine_is_compatible("lantiq,gr9") \|\|
329afb94 AJB	275	of_machine_is_compatible("lantiq,vr9") \|\|
	276	of_machine_is_compatible("lantiq,ar10") \|\|
	277	of_machine_is_compatible("lantiq,grx390")) {
50f09073 MB	278	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy1", &phy))
	279	chip->phy1 = phy & XWAY_STP_PHY_MASK;
	280	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy2", &phy))
	281	chip->phy2 = phy & XWAY_STP_PHY_MASK;
329afb94 AJB	282	}
	283
	284	if (of_machine_is_compatible("lantiq,ar10") \|\|
	285	of_machine_is_compatible("lantiq,grx390")) {
	286	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy3", &phy))
	287	chip->phy3 = phy & XWAY_STP_PHY_MASK;
	288	}
	289
	290	if (of_machine_is_compatible("lantiq,grx390")) {
	291	if (!of_property_read_u32(pdev->dev.of_node, "lantiq,phy4", &phy))
	292	chip->phy4 = phy & XWAY_STP_PHY_MASK;
54f30066 JC	293	}
	294
	295	/* check which edge trigger we should use, default to a falling edge */
5b0ad5b2	296	if (!of_property_read_bool(pdev->dev.of_node, "lantiq,rising"))
54f30066 JC	297	chip->edge = XWAY_STP_FALLING;
54f30066 JC	298
bd791c48	299	clk = devm_clk_get(&pdev->dev, NULL);
54f30066 JC	300	if (IS_ERR(clk)) {
	301	dev_err(&pdev->dev, "Failed to get clock\n");
	302	return PTR_ERR(clk);
	303	}
54f30066	304
bd791c48 MB	305	ret = clk_prepare_enable(clk);
	306	if (ret)
	307	return ret;
54f30066	308
8a7b1797	309	xway_stp_hw_init(chip);
935c500c	310
8a7b1797	311	ret = devm_gpiochip_add_data(&pdev->dev, &chip->gc, chip);
bd791c48 MB	312	if (ret) {
bd791c48 MB	313	clk_disable_unprepare(clk);
8a7b1797	314	return ret;
bd791c48	315	}
935c500c	316
8a7b1797 MB	317	dev_info(&pdev->dev, "Init done\n");
	318
	319	return 0;
935c500c JC	320	}
935c500c JC	321
54f30066 JC	322	static const struct of_device_id xway_stp_match[] = {
	323	{ .compatible = "lantiq,gpio-stp-xway" },
	324	{},
	325	};
	326	MODULE_DEVICE_TABLE(of, xway_stp_match);
	327
	328	static struct platform_driver xway_stp_driver = {
	329	.probe = xway_stp_probe,
935c500c	330	.driver = {
54f30066	331	.name = "gpio-stp-xway",
54f30066	332	.of_match_table = xway_stp_match,
935c500c JC	333	},
	334	};
	335
afdadc06	336	static int __init xway_stp_init(void)
935c500c	337	{
54f30066	338	return platform_driver_register(&xway_stp_driver);
935c500c JC	339	}
935c500c JC	340
54f30066	341	subsys_initcall(xway_stp_init);