[people/ms/u-boot.git] / drivers / gpio / intel_broadwell_gpio.c

/*
 * Copyright (c) 2012 The Chromium OS Authors.
 * SPDX-License-Identifier:	GPL-2.0+
 */

#include <common.h>
#include <dm.h>
#include <errno.h>
#include <fdtdec.h>
#include <pch.h>
#include <pci.h>
#include <asm/cpu.h>
#include <asm/gpio.h>
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/arch/gpio.h>
#include <dt-bindings/gpio/x86-gpio.h>

DECLARE_GLOBAL_DATA_PTR;

/**
 * struct broadwell_bank_priv - Private driver data
 *
 * @regs:	Pointer to GPIO registers
 * @bank:	Bank number for this bank (0, 1 or 2)
 * @offset:	GPIO offset for this bank (0, 32 or 64)
 */
struct broadwell_bank_priv {
	struct pch_lp_gpio_regs *regs;
	int bank;
	int offset;
};

static int broadwell_gpio_request(struct udevice *dev, unsigned offset,
			     const char *label)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;
	u32 val;

	/*
	 * Make sure that the GPIO pin we want isn't already in use for some
	 * built-in hardware function. We have to check this for every
	 * requested pin.
	 */
	debug("%s: request bank %d offset %d: ", __func__, priv->bank, offset);
	val = inl(&regs->own[priv->bank]);
	if (!(val & (1UL << offset))) {
		debug("gpio is reserved for internal use\n");
		return -EPERM;
	}
	debug("ok\n");

	return 0;
}

static int broadwell_gpio_direction_input(struct udevice *dev, unsigned offset)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;

	setio_32(&regs->config[priv->offset + offset], CONFA_DIR_INPUT);

	return 0;
}

static int broadwell_gpio_get_value(struct udevice *dev, unsigned offset)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;

	return inl(&regs->config[priv->offset + offset]) & CONFA_LEVEL_HIGH ?
		1 : 0;
}

static int broadwell_gpio_set_value(struct udevice *dev, unsigned offset,
				    int value)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;

	debug("%s: dev=%s, offset=%d, value=%d\n", __func__, dev->name, offset,
	      value);
	clrsetio_32(&regs->config[priv->offset + offset], CONFA_OUTPUT_HIGH,
		      value ? CONFA_OUTPUT_HIGH : 0);

	return 0;
}

static int broadwell_gpio_direction_output(struct udevice *dev, unsigned offset,
					   int value)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;

	broadwell_gpio_set_value(dev, offset, value);
	clrio_32(&regs->config[priv->offset + offset], CONFA_DIR_INPUT);

	return 0;
}

static int broadwell_gpio_get_function(struct udevice *dev, unsigned offset)
{
	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	struct pch_lp_gpio_regs *regs = priv->regs;
	u32 mask = 1UL << offset;

	if (!(inl(&regs->own[priv->bank]) & mask))
		return GPIOF_FUNC;
	if (inl(&regs->config[priv->offset + offset]) & CONFA_DIR_INPUT)
		return GPIOF_INPUT;
	else
		return GPIOF_OUTPUT;
}

static int broadwell_gpio_probe(struct udevice *dev)
{
	struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	struct broadwell_bank_priv *priv = dev_get_priv(dev);

	uc_priv->gpio_count = GPIO_PER_BANK;
	uc_priv->bank_name = plat->bank_name;

	priv->regs = (struct pch_lp_gpio_regs *)(uintptr_t)plat->base_addr;
	priv->bank = plat->bank;
	priv->offset = priv->bank * 32;
	debug("%s: probe done, regs %p, bank %d\n", __func__, priv->regs,
	      priv->bank);

	return 0;
}

static int broadwell_gpio_ofdata_to_platdata(struct udevice *dev)
{
	struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
	u32 gpiobase;
	int bank;
	int ret;

	ret = pch_get_gpio_base(dev->parent, &gpiobase);
	if (ret)
		return ret;

	bank = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
	if (bank == -1) {
		debug("%s: Invalid bank number %d\n", __func__, bank);
		return -EINVAL;
	}
	plat->bank = bank;
	plat->base_addr = gpiobase;
	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
				      "bank-name", NULL);

	return 0;
}

static const struct dm_gpio_ops gpio_broadwell_ops = {
	.request		= broadwell_gpio_request,
	.direction_input	= broadwell_gpio_direction_input,
	.direction_output	= broadwell_gpio_direction_output,
	.get_value		= broadwell_gpio_get_value,
	.set_value		= broadwell_gpio_set_value,
	.get_function		= broadwell_gpio_get_function,
};

static const struct udevice_id intel_broadwell_gpio_ids[] = {
	{ .compatible = "intel,broadwell-gpio" },
	{ }
};

U_BOOT_DRIVER(gpio_broadwell) = {
	.name	= "gpio_broadwell",
	.id	= UCLASS_GPIO,
	.of_match = intel_broadwell_gpio_ids,
	.ops	= &gpio_broadwell_ops,
	.ofdata_to_platdata	= broadwell_gpio_ofdata_to_platdata,
	.probe	= broadwell_gpio_probe,
	.priv_auto_alloc_size = sizeof(struct broadwell_bank_priv),
	.platdata_auto_alloc_size = sizeof(struct broadwell_bank_platdata),
};
Commit	Line	Data
64b17977 SG	1	/*
	2	* Copyright (c) 2012 The Chromium OS Authors.
	3	* SPDX-License-Identifier: GPL-2.0+
	4	*/
	5
	6	#include <common.h>
	7	#include <dm.h>
	8	#include <errno.h>
	9	#include <fdtdec.h>
	10	#include <pch.h>
	11	#include <pci.h>
64b17977 SG	12	#include <asm/cpu.h>
	13	#include <asm/gpio.h>
	14	#include <asm/io.h>
	15	#include <asm/pci.h>
	16	#include <asm/arch/gpio.h>
	17	#include <dt-bindings/gpio/x86-gpio.h>
	18
	19	DECLARE_GLOBAL_DATA_PTR;
	20
	21	/**
	22	* struct broadwell_bank_priv - Private driver data
	23	*
	24	* @regs: Pointer to GPIO registers
	25	* @bank: Bank number for this bank (0, 1 or 2)
	26	* @offset: GPIO offset for this bank (0, 32 or 64)
	27	*/
	28	struct broadwell_bank_priv {
	29	struct pch_lp_gpio_regs *regs;
	30	int bank;
	31	int offset;
	32	};
	33
	34	static int broadwell_gpio_request(struct udevice *dev, unsigned offset,
	35	const char *label)
	36	{
	37	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	38	struct pch_lp_gpio_regs *regs = priv->regs;
	39	u32 val;
	40
	41	/*
	42	* Make sure that the GPIO pin we want isn't already in use for some
	43	* built-in hardware function. We have to check this for every
	44	* requested pin.
	45	*/
	46	debug("%s: request bank %d offset %d: ", __func__, priv->bank, offset);
	47	val = inl(&regs->own[priv->bank]);
	48	if (!(val & (1UL << offset))) {
	49	debug("gpio is reserved for internal use\n");
	50	return -EPERM;
	51	}
	52	debug("ok\n");
	53
	54	return 0;
	55	}
	56
	57	static int broadwell_gpio_direction_input(struct udevice *dev, unsigned offset)
	58	{
	59	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	60	struct pch_lp_gpio_regs *regs = priv->regs;
	61
	62	setio_32(&regs->config[priv->offset + offset], CONFA_DIR_INPUT);
	63
	64	return 0;
	65	}
	66
	67	static int broadwell_gpio_get_value(struct udevice *dev, unsigned offset)
	68	{
	69	struct broadwell_bank_priv *priv = dev_get_priv(dev);
	70	struct pch_lp_gpio_regs *regs = priv->regs;
	71
	72	return inl(&regs->config[priv->offset + offset]) & CONFA_LEVEL_HIGH ?
	73	1 : 0;
	74	}
	75
76	static int broadwell_gpio_set_value(struct udevice *dev, unsigned offset,
77	int value)
78	{
79	struct broadwell_bank_priv *priv = dev_get_priv(dev);
80	struct pch_lp_gpio_regs *regs = priv->regs;
81
82	debug("%s: dev=%s, offset=%d, value=%d\n", __func__, dev->name, offset,
83	value);
84	clrsetio_32(&regs->config[priv->offset + offset], CONFA_OUTPUT_HIGH,
85	value ? CONFA_OUTPUT_HIGH : 0);
86
87	return 0;
88	}
89
90	static int broadwell_gpio_direction_output(struct udevice *dev, unsigned offset,
91	int value)
92	{
93	struct broadwell_bank_priv *priv = dev_get_priv(dev);
94	struct pch_lp_gpio_regs *regs = priv->regs;
95
96	broadwell_gpio_set_value(dev, offset, value);
97	clrio_32(&regs->config[priv->offset + offset], CONFA_DIR_INPUT);
98
99	return 0;
100	}
101
102	static int broadwell_gpio_get_function(struct udevice *dev, unsigned offset)
103	{
104	struct broadwell_bank_priv *priv = dev_get_priv(dev);
105	struct pch_lp_gpio_regs *regs = priv->regs;
106	u32 mask = 1UL << offset;
107
108	if (!(inl(&regs->own[priv->bank]) & mask))
109	return GPIOF_FUNC;
110	if (inl(&regs->config[priv->offset + offset]) & CONFA_DIR_INPUT)
111	return GPIOF_INPUT;
112	else
113	return GPIOF_OUTPUT;
114	}
115
116	static int broadwell_gpio_probe(struct udevice *dev)
117	{
118	struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
119	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
120	struct broadwell_bank_priv *priv = dev_get_priv(dev);
64b17977 SG	121
	122	uc_priv->gpio_count = GPIO_PER_BANK;
	123	uc_priv->bank_name = plat->bank_name;
	124
	125	priv->regs = (struct pch_lp_gpio_regs *)(uintptr_t)plat->base_addr;
	126	priv->bank = plat->bank;
	127	priv->offset = priv->bank * 32;
	128	debug("%s: probe done, regs %p, bank %d\n", __func__, priv->regs,
	129	priv->bank);
	130
	131	return 0;
	132	}
	133
	134	static int broadwell_gpio_ofdata_to_platdata(struct udevice *dev)
	135	{
	136	struct broadwell_bank_platdata *plat = dev_get_platdata(dev);
	137	u32 gpiobase;
	138	int bank;
	139	int ret;
	140
	141	ret = pch_get_gpio_base(dev->parent, &gpiobase);
	142	if (ret)
	143	return ret;
	144
	145	bank = fdtdec_get_int(gd->fdt_blob, dev->of_offset, "reg", -1);
	146	if (bank == -1) {
	147	debug("%s: Invalid bank number %d\n", __func__, bank);
	148	return -EINVAL;
	149	}
	150	plat->bank = bank;
	151	plat->base_addr = gpiobase;
	152	plat->bank_name = fdt_getprop(gd->fdt_blob, dev->of_offset,
	153	"bank-name", NULL);
	154
	155	return 0;
	156	}
	157
64b17977 SG	158	static const struct dm_gpio_ops gpio_broadwell_ops = {
	159	.request = broadwell_gpio_request,
	160	.direction_input = broadwell_gpio_direction_input,
	161	.direction_output = broadwell_gpio_direction_output,
	162	.get_value = broadwell_gpio_get_value,
	163	.set_value = broadwell_gpio_set_value,
	164	.get_function = broadwell_gpio_get_function,
64b17977 SG	165	};
	166
	167	static const struct udevice_id intel_broadwell_gpio_ids[] = {
	168	{ .compatible = "intel,broadwell-gpio" },
	169	{ }
	170	};
	171
	172	U_BOOT_DRIVER(gpio_broadwell) = {
	173	.name = "gpio_broadwell",
	174	.id = UCLASS_GPIO,
	175	.of_match = intel_broadwell_gpio_ids,
	176	.ops = &gpio_broadwell_ops,
	177	.ofdata_to_platdata = broadwell_gpio_ofdata_to_platdata,
	178	.probe = broadwell_gpio_probe,
	179	.priv_auto_alloc_size = sizeof(struct broadwell_bank_priv),
	180	.platdata_auto_alloc_size = sizeof(struct broadwell_bank_platdata),
	181	};