[u-boot.git] / drivers / gpio / tegra186_gpio.c

/*
 * Copyright (c) 2010-2016, NVIDIA CORPORATION.
 * (based on tegra_gpio.c)
 *
 * SPDX-License-Identifier: GPL-2.0
 */

#include <common.h>
#include <dm.h>
#include <malloc.h>
#include <errno.h>
#include <fdtdec.h>
#include <asm/io.h>
#include <asm/bitops.h>
#include <asm/gpio.h>
#include <dm/device-internal.h>
#include <dt-bindings/gpio/gpio.h>
#include "tegra186_gpio_priv.h"

DECLARE_GLOBAL_DATA_PTR;

struct tegra186_gpio_port_data {
	const char *name;
	uint32_t offset;
};

struct tegra186_gpio_ctlr_data {
	const struct tegra186_gpio_port_data *ports;
	uint32_t port_count;
};

struct tegra186_gpio_platdata {
	const char *name;
	uint32_t *regs;
};

static uint32_t *tegra186_gpio_reg(struct udevice *dev, uint32_t reg,
				   uint32_t gpio)
{
	struct tegra186_gpio_platdata *plat = dev->platdata;
	uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;

	return &(plat->regs[index]);
}

static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
				 bool output)
{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
	rval = readl(reg);
	if (output)
		rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	else
		rval |= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	writel(rval, reg);

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);
	if (output)
		rval |= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	else
		rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	rval |= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
	writel(rval, reg);

	return 0;
}

static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
	rval = readl(reg);
	if (val)
		rval |= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
	else
		rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
	writel(rval, reg);

	return 0;
}

static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
{
	return tegra186_gpio_set_out(dev, offset, false);
}

static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
				       int value)
{
	int ret;

	ret = tegra186_gpio_set_val(dev, offset, value != 0);
	if (ret)
		return ret;
	return tegra186_gpio_set_out(dev, offset, true);
}

static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);

	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
		reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
					offset);
	else
		reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);

	rval = readl(reg);
	return !!rval;
}

static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
				   int value)
{
	return tegra186_gpio_set_val(dev, offset, value != 0);
}

static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
{
	uint32_t *reg;
	uint32_t rval;

	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	rval = readl(reg);
	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
		return GPIOF_OUTPUT;
	else
		return GPIOF_INPUT;
}

static int tegra186_gpio_xlate(struct udevice *dev, struct gpio_desc *desc,
			       struct ofnode_phandle_args *args)
{
	int gpio, port, ret;

	gpio = args->args[0];
	port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
	ret = device_get_child(dev, port, &desc->dev);
	if (ret)
		return ret;
	desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;

	return 0;
}

static const struct dm_gpio_ops tegra186_gpio_ops = {
	.direction_input	= tegra186_gpio_direction_input,
	.direction_output	= tegra186_gpio_direction_output,
	.get_value		= tegra186_gpio_get_value,
	.set_value		= tegra186_gpio_set_value,
	.get_function		= tegra186_gpio_get_function,
	.xlate			= tegra186_gpio_xlate,
};

/**
 * We have a top-level GPIO device with no actual GPIOs. It has a child device
 * for each port within the controller.
 */
static int tegra186_gpio_bind(struct udevice *parent)
{
	struct tegra186_gpio_platdata *parent_plat = parent->platdata;
	struct tegra186_gpio_ctlr_data *ctlr_data =
		(struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
	uint32_t *regs;
	int port, ret;

	/* If this is a child device, there is nothing to do here */
	if (parent_plat)
		return 0;

	regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
	if (regs == (uint32_t *)FDT_ADDR_T_NONE)
		return -ENODEV;

	for (port = 0; port < ctlr_data->port_count; port++) {
		struct tegra186_gpio_platdata *plat;
		struct udevice *dev;

		plat = calloc(1, sizeof(*plat));
		if (!plat)
			return -ENOMEM;
		plat->name = ctlr_data->ports[port].name;
		plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);

		ret = device_bind(parent, parent->driver, plat->name, plat,
				  -1, &dev);
		if (ret)
			return ret;
		dev_set_of_offset(dev, dev_of_offset(parent));
	}

	return 0;
}

static int tegra186_gpio_probe(struct udevice *dev)
{
	struct tegra186_gpio_platdata *plat = dev->platdata;
	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);

	/* Only child devices have ports */
	if (!plat)
		return 0;

	uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
	uc_priv->bank_name = plat->name;

	return 0;
}

static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
	{"A",  0x2000},
	{"B",  0x3000},
	{"C",  0x3200},
	{"D",  0x3400},
	{"E",  0x2200},
	{"F",  0x2400},
	{"G",  0x4200},
	{"H",  0x1000},
	{"I",  0x0800},
	{"J",  0x5000},
	{"K",  0x5200},
	{"L",  0x1200},
	{"M",  0x5600},
	{"N",  0x0000},
	{"O",  0x0200},
	{"P",  0x4000},
	{"Q",  0x0400},
	{"R",  0x0a00},
	{"T",  0x0600},
	{"X",  0x1400},
	{"Y",  0x1600},
	{"BB", 0x2600},
	{"CC", 0x5400},
};

static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
	.ports = tegra186_gpio_main_ports,
	.port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
};

static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
	{"S",  0x0200},
	{"U",  0x0400},
	{"V",  0x0800},
	{"W",  0x0a00},
	{"Z",  0x0e00},
	{"AA", 0x0c00},
	{"EE", 0x0600},
	{"FF", 0x0000},
};

static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
	.ports = tegra186_gpio_aon_ports,
	.port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
};

static const struct udevice_id tegra186_gpio_ids[] = {
	{
		.compatible = "nvidia,tegra186-gpio",
		.data = (ulong)&tegra186_gpio_main_data,
	},
	{
		.compatible = "nvidia,tegra186-gpio-aon",
		.data = (ulong)&tegra186_gpio_aon_data,
	},
	{ }
};

U_BOOT_DRIVER(tegra186_gpio) = {
	.name = "tegra186_gpio",
	.id = UCLASS_GPIO,
	.of_match = tegra186_gpio_ids,
	.bind = tegra186_gpio_bind,
	.probe = tegra186_gpio_probe,
	.ops = &tegra186_gpio_ops,
	.flags = DM_FLAG_PRE_RELOC,
};
Commit	Line	Data
074a1fdd SW	1	/*
	2	* Copyright (c) 2010-2016, NVIDIA CORPORATION.
	3	* (based on tegra_gpio.c)
	4	*
	5	* SPDX-License-Identifier: GPL-2.0
	6	*/
	7
	8	#include <common.h>
	9	#include <dm.h>
	10	#include <malloc.h>
	11	#include <errno.h>
	12	#include <fdtdec.h>
	13	#include <asm/io.h>
	14	#include <asm/bitops.h>
	15	#include <asm/gpio.h>
	16	#include <dm/device-internal.h>
	17	#include <dt-bindings/gpio/gpio.h>
	18	#include "tegra186_gpio_priv.h"
	19
	20	DECLARE_GLOBAL_DATA_PTR;
	21
	22	struct tegra186_gpio_port_data {
	23	const char *name;
	24	uint32_t offset;
	25	};
	26
	27	struct tegra186_gpio_ctlr_data {
	28	const struct tegra186_gpio_port_data *ports;
	29	uint32_t port_count;
	30	};
	31
	32	struct tegra186_gpio_platdata {
	33	const char *name;
	34	uint32_t *regs;
	35	};
	36
	37	static uint32_t tegra186_gpio_reg(struct udevice dev, uint32_t reg,
	38	uint32_t gpio)
	39	{
	40	struct tegra186_gpio_platdata *plat = dev->platdata;
	41	uint32_t index = (reg + (gpio * TEGRA186_GPIO_PER_GPIO_STRIDE)) / 4;
	42
	43	return &(plat->regs[index]);
	44	}
	45
	46	static int tegra186_gpio_set_out(struct udevice *dev, unsigned offset,
	47	bool output)
	48	{
	49	uint32_t *reg;
	50	uint32_t rval;
	51
	52	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_CONTROL, offset);
	53	rval = readl(reg);
	54	if (output)
	55	rval &= ~TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	56	else
	57	rval \|= TEGRA186_GPIO_OUTPUT_CONTROL_FLOATED;
	58	writel(rval, reg);
	59
	60	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
	61	rval = readl(reg);
	62	if (output)
	63	rval \|= TEGRA186_GPIO_ENABLE_CONFIG_OUT;
	64	else
65	rval &= ~TEGRA186_GPIO_ENABLE_CONFIG_OUT;
66	rval \|= TEGRA186_GPIO_ENABLE_CONFIG_ENABLE;
67	writel(rval, reg);
68
69	return 0;
70	}
71
72	static int tegra186_gpio_set_val(struct udevice *dev, unsigned offset, bool val)
73	{
74	uint32_t *reg;
75	uint32_t rval;
76
77	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE, offset);
78	rval = readl(reg);
79	if (val)
80	rval \|= TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
81	else
82	rval &= ~TEGRA186_GPIO_OUTPUT_VALUE_HIGH;
83	writel(rval, reg);
84
85	return 0;
86	}
87
88	static int tegra186_gpio_direction_input(struct udevice *dev, unsigned offset)
89	{
90	return tegra186_gpio_set_out(dev, offset, false);
91	}
92
93	static int tegra186_gpio_direction_output(struct udevice *dev, unsigned offset,
94	int value)
95	{
96	int ret;
97
98	ret = tegra186_gpio_set_val(dev, offset, value != 0);
99	if (ret)
100	return ret;
101	return tegra186_gpio_set_out(dev, offset, true);
102	}
103
104	static int tegra186_gpio_get_value(struct udevice *dev, unsigned offset)
105	{
106	uint32_t *reg;
107	uint32_t rval;
108
109	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
110	rval = readl(reg);
111
112	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
113	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_OUTPUT_VALUE,
114	offset);
115	else
116	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_INPUT, offset);
117
118	rval = readl(reg);
119	return !!rval;
120	}
121
122	static int tegra186_gpio_set_value(struct udevice *dev, unsigned offset,
123	int value)
124	{
125	return tegra186_gpio_set_val(dev, offset, value != 0);
126	}
127
128	static int tegra186_gpio_get_function(struct udevice *dev, unsigned offset)
129	{
130	uint32_t *reg;
131	uint32_t rval;
132
133	reg = tegra186_gpio_reg(dev, TEGRA186_GPIO_ENABLE_CONFIG, offset);
134	rval = readl(reg);
135	if (rval & TEGRA186_GPIO_ENABLE_CONFIG_OUT)
136	return GPIOF_OUTPUT;
137	else
138	return GPIOF_INPUT;
139	}
140
141	static int tegra186_gpio_xlate(struct udevice dev, struct gpio_desc desc,
3a57123e	142	struct ofnode_phandle_args *args)
074a1fdd SW	143	{
	144	int gpio, port, ret;
	145
	146	gpio = args->args[0];
	147	port = gpio / TEGRA186_GPIO_PER_GPIO_COUNT;
	148	ret = device_get_child(dev, port, &desc->dev);
	149	if (ret)
	150	return ret;
	151	desc->offset = gpio % TEGRA186_GPIO_PER_GPIO_COUNT;
	152	desc->flags = args->args[1] & GPIO_ACTIVE_LOW ? GPIOD_ACTIVE_LOW : 0;
	153
	154	return 0;
	155	}
	156
	157	static const struct dm_gpio_ops tegra186_gpio_ops = {
	158	.direction_input = tegra186_gpio_direction_input,
	159	.direction_output = tegra186_gpio_direction_output,
	160	.get_value = tegra186_gpio_get_value,
	161	.set_value = tegra186_gpio_set_value,
	162	.get_function = tegra186_gpio_get_function,
	163	.xlate = tegra186_gpio_xlate,
	164	};
	165
	166	/**
	167	* We have a top-level GPIO device with no actual GPIOs. It has a child device
	168	* for each port within the controller.
	169	*/
	170	static int tegra186_gpio_bind(struct udevice *parent)
	171	{
	172	struct tegra186_gpio_platdata *parent_plat = parent->platdata;
	173	struct tegra186_gpio_ctlr_data *ctlr_data =
	174	(struct tegra186_gpio_ctlr_data *)dev_get_driver_data(parent);
	175	uint32_t *regs;
	176	int port, ret;
	177
	178	/* If this is a child device, there is nothing to do here */
	179	if (parent_plat)
	180	return 0;
	181
a821c4af	182	regs = (uint32_t *)devfdt_get_addr_name(parent, "gpio");
074a1fdd SW	183	if (regs == (uint32_t *)FDT_ADDR_T_NONE)
	184	return -ENODEV;
	185
	186	for (port = 0; port < ctlr_data->port_count; port++) {
	187	struct tegra186_gpio_platdata *plat;
	188	struct udevice *dev;
	189
	190	plat = calloc(1, sizeof(*plat));
	191	if (!plat)
	192	return -ENOMEM;
	193	plat->name = ctlr_data->ports[port].name;
	194	plat->regs = &(regs[ctlr_data->ports[port].offset / 4]);
	195
	196	ret = device_bind(parent, parent->driver, plat->name, plat,
	197	-1, &dev);
	198	if (ret)
	199	return ret;
e160f7d4	200	dev_set_of_offset(dev, dev_of_offset(parent));
074a1fdd SW	201	}
	202
	203	return 0;
	204	}
	205
	206	static int tegra186_gpio_probe(struct udevice *dev)
	207	{
	208	struct tegra186_gpio_platdata *plat = dev->platdata;
	209	struct gpio_dev_priv *uc_priv = dev_get_uclass_priv(dev);
	210
	211	/* Only child devices have ports */
	212	if (!plat)
	213	return 0;
	214
	215	uc_priv->gpio_count = TEGRA186_GPIO_PER_GPIO_COUNT;
	216	uc_priv->bank_name = plat->name;
	217
	218	return 0;
	219	}
	220
	221	static const struct tegra186_gpio_port_data tegra186_gpio_main_ports[] = {
	222	{"A", 0x2000},
	223	{"B", 0x3000},
	224	{"C", 0x3200},
	225	{"D", 0x3400},
	226	{"E", 0x2200},
	227	{"F", 0x2400},
	228	{"G", 0x4200},
	229	{"H", 0x1000},
	230	{"I", 0x0800},
	231	{"J", 0x5000},
	232	{"K", 0x5200},
	233	{"L", 0x1200},
	234	{"M", 0x5600},
	235	{"N", 0x0000},
	236	{"O", 0x0200},
	237	{"P", 0x4000},
	238	{"Q", 0x0400},
	239	{"R", 0x0a00},
	240	{"T", 0x0600},
	241	{"X", 0x1400},
	242	{"Y", 0x1600},
	243	{"BB", 0x2600},
	244	{"CC", 0x5400},
	245	};
	246
	247	static const struct tegra186_gpio_ctlr_data tegra186_gpio_main_data = {
	248	.ports = tegra186_gpio_main_ports,
	249	.port_count = ARRAY_SIZE(tegra186_gpio_main_ports),
	250	};
	251
	252	static const struct tegra186_gpio_port_data tegra186_gpio_aon_ports[] = {
	253	{"S", 0x0200},
	254	{"U", 0x0400},
	255	{"V", 0x0800},
	256	{"W", 0x0a00},
	257	{"Z", 0x0e00},
	258	{"AA", 0x0c00},
	259	{"EE", 0x0600},
	260	{"FF", 0x0000},
	261	};
	262
	263	static const struct tegra186_gpio_ctlr_data tegra186_gpio_aon_data = {
	264	.ports = tegra186_gpio_aon_ports,
265	.port_count = ARRAY_SIZE(tegra186_gpio_aon_ports),
266	};
267
268	static const struct udevice_id tegra186_gpio_ids[] = {
269	{
270	.compatible = "nvidia,tegra186-gpio",
271	.data = (ulong)&tegra186_gpio_main_data,
272	},
273	{
274	.compatible = "nvidia,tegra186-gpio-aon",
275	.data = (ulong)&tegra186_gpio_aon_data,
276	},
277	{ }
278	};
279
280	U_BOOT_DRIVER(tegra186_gpio) = {
281	.name = "tegra186_gpio",
282	.id = UCLASS_GPIO,
283	.of_match = tegra186_gpio_ids,
284	.bind = tegra186_gpio_bind,
285	.probe = tegra186_gpio_probe,
286	.ops = &tegra186_gpio_ops,
287	.flags = DM_FLAG_PRE_RELOC,
288	};