[mirror_ubuntu-bionic-kernel.git] / drivers / mfd / vexpress-sysreg.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Copyright (C) 2012 ARM Limited
 */

#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/io.h>
#include <linux/leds.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/regulator/driver.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/timer.h>
#include <linux/vexpress.h>

#define SYS_ID			0x000
#define SYS_SW			0x004
#define SYS_LED			0x008
#define SYS_100HZ		0x024
#define SYS_FLAGS		0x030
#define SYS_FLAGSSET		0x030
#define SYS_FLAGSCLR		0x034
#define SYS_NVFLAGS		0x038
#define SYS_NVFLAGSSET		0x038
#define SYS_NVFLAGSCLR		0x03c
#define SYS_MCI			0x048
#define SYS_FLASH		0x04c
#define SYS_CFGSW		0x058
#define SYS_24MHZ		0x05c
#define SYS_MISC		0x060
#define SYS_DMA			0x064
#define SYS_PROCID0		0x084
#define SYS_PROCID1		0x088
#define SYS_CFGDATA		0x0a0
#define SYS_CFGCTRL		0x0a4
#define SYS_CFGSTAT		0x0a8

#define SYS_HBI_MASK		0xfff
#define SYS_ID_HBI_SHIFT	16
#define SYS_PROCIDx_HBI_SHIFT	0

#define SYS_LED_LED(n)		(1 << (n))

#define SYS_MCI_CARDIN		(1 << 0)
#define SYS_MCI_WPROT		(1 << 1)

#define SYS_FLASH_WPn		(1 << 0)

#define SYS_MISC_MASTERSITE	(1 << 14)

#define SYS_CFGCTRL_START	(1 << 31)
#define SYS_CFGCTRL_WRITE	(1 << 30)
#define SYS_CFGCTRL_DCC(n)	(((n) & 0xf) << 26)
#define SYS_CFGCTRL_FUNC(n)	(((n) & 0x3f) << 20)
#define SYS_CFGCTRL_SITE(n)	(((n) & 0x3) << 16)
#define SYS_CFGCTRL_POSITION(n)	(((n) & 0xf) << 12)
#define SYS_CFGCTRL_DEVICE(n)	(((n) & 0xfff) << 0)

#define SYS_CFGSTAT_ERR		(1 << 1)
#define SYS_CFGSTAT_COMPLETE	(1 << 0)


static void __iomem *vexpress_sysreg_base;
static struct device *vexpress_sysreg_dev;
static int vexpress_master_site;


void vexpress_flags_set(u32 data)
{
	writel(~0, vexpress_sysreg_base + SYS_FLAGSCLR);
	writel(data, vexpress_sysreg_base + SYS_FLAGSSET);
}

u32 vexpress_get_procid(int site)
{
	if (site == VEXPRESS_SITE_MASTER)
		site = vexpress_master_site;

	return readl(vexpress_sysreg_base + (site == VEXPRESS_SITE_DB1 ?
			SYS_PROCID0 : SYS_PROCID1));
}

u32 vexpress_get_hbi(int site)
{
	u32 id;

	switch (site) {
	case VEXPRESS_SITE_MB:
		id = readl(vexpress_sysreg_base + SYS_ID);
		return (id >> SYS_ID_HBI_SHIFT) & SYS_HBI_MASK;
	case VEXPRESS_SITE_MASTER:
	case VEXPRESS_SITE_DB1:
	case VEXPRESS_SITE_DB2:
		id = vexpress_get_procid(site);
		return (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
	}

	return ~0;
}

void __iomem *vexpress_get_24mhz_clock_base(void)
{
	return vexpress_sysreg_base + SYS_24MHZ;
}


static void vexpress_sysreg_find_prop(struct device_node *node,
		const char *name, u32 *val)
{
	of_node_get(node);
	while (node) {
		if (of_property_read_u32(node, name, val) == 0) {
			of_node_put(node);
			return;
		}
		node = of_get_next_parent(node);
	}
}

unsigned __vexpress_get_site(struct device *dev, struct device_node *node)
{
	u32 site = 0;

	WARN_ON(dev && node && dev->of_node != node);
	if (dev && !node)
		node = dev->of_node;

	if (node) {
		vexpress_sysreg_find_prop(node, "arm,vexpress,site", &site);
	} else if (dev && dev->bus == &platform_bus_type) {
		struct platform_device *pdev = to_platform_device(dev);

		if (pdev->num_resources == 1 &&
				pdev->resource[0].flags == IORESOURCE_BUS)
			site = pdev->resource[0].start;
	} else if (dev && strncmp(dev_name(dev), "ct:", 3) == 0) {
		site = VEXPRESS_SITE_MASTER;
	}

	if (site == VEXPRESS_SITE_MASTER)
		site = vexpress_master_site;

	return site;
}


struct vexpress_sysreg_config_func {
	u32 template;
	u32 device;
};

static struct vexpress_config_bridge *vexpress_sysreg_config_bridge;
static struct timer_list vexpress_sysreg_config_timer;
static u32 *vexpress_sysreg_config_data;
static int vexpress_sysreg_config_tries;

static void *vexpress_sysreg_config_func_get(struct device *dev,
		struct device_node *node)
{
	struct vexpress_sysreg_config_func *config_func;
	u32 site;
	u32 position = 0;
	u32 dcc = 0;
	u32 func_device[2];
	int err = -EFAULT;

	if (node) {
		of_node_get(node);
		vexpress_sysreg_find_prop(node, "arm,vexpress,site", &site);
		vexpress_sysreg_find_prop(node, "arm,vexpress,position",
				&position);
		vexpress_sysreg_find_prop(node, "arm,vexpress,dcc", &dcc);
		err = of_property_read_u32_array(node,
				"arm,vexpress-sysreg,func", func_device,
				ARRAY_SIZE(func_device));
		of_node_put(node);
	} else if (dev && dev->bus == &platform_bus_type) {
		struct platform_device *pdev = to_platform_device(dev);

		if (pdev->num_resources == 1 &&
				pdev->resource[0].flags == IORESOURCE_BUS) {
			site = pdev->resource[0].start;
			func_device[0] = pdev->resource[0].end;
			func_device[1] = pdev->id;
			err = 0;
		}
	}
	if (err)
		return NULL;

	config_func = kzalloc(sizeof(*config_func), GFP_KERNEL);
	if (!config_func)
		return NULL;

	config_func->template = SYS_CFGCTRL_DCC(dcc);
	config_func->template |= SYS_CFGCTRL_FUNC(func_device[0]);
	config_func->template |= SYS_CFGCTRL_SITE(site == VEXPRESS_SITE_MASTER ?
			vexpress_master_site : site);
	config_func->template |= SYS_CFGCTRL_POSITION(position);
	config_func->device |= func_device[1];

	dev_dbg(vexpress_sysreg_dev, "func 0x%p = 0x%x, %d\n", config_func,
			config_func->template, config_func->device);

	return config_func;
}

static void vexpress_sysreg_config_func_put(void *func)
{
	kfree(func);
}

static int vexpress_sysreg_config_func_exec(void *func, int offset,
		bool write, u32 *data)
{
	int status;
	struct vexpress_sysreg_config_func *config_func = func;
	u32 command;

	if (WARN_ON(!vexpress_sysreg_base))
		return -ENOENT;

	command = readl(vexpress_sysreg_base + SYS_CFGCTRL);
	if (WARN_ON(command & SYS_CFGCTRL_START))
		return -EBUSY;

	command = SYS_CFGCTRL_START;
	command |= write ? SYS_CFGCTRL_WRITE : 0;
	command |= config_func->template;
	command |= SYS_CFGCTRL_DEVICE(config_func->device + offset);

	/* Use a canary for reads */
	if (!write)
		*data = 0xdeadbeef;

	dev_dbg(vexpress_sysreg_dev, "command %x, data %x\n",
			command, *data);
	writel(*data, vexpress_sysreg_base + SYS_CFGDATA);
	writel(0, vexpress_sysreg_base + SYS_CFGSTAT);
	writel(command, vexpress_sysreg_base + SYS_CFGCTRL);
	mb();

	if (vexpress_sysreg_dev) {
		/* Schedule completion check */
		if (!write)
			vexpress_sysreg_config_data = data;
		vexpress_sysreg_config_tries = 100;
		mod_timer(&vexpress_sysreg_config_timer,
				jiffies + usecs_to_jiffies(100));
		status = VEXPRESS_CONFIG_STATUS_WAIT;
	} else {
		/* Early execution, no timer available, have to spin */
		u32 cfgstat;

		do {
			cpu_relax();
			cfgstat = readl(vexpress_sysreg_base + SYS_CFGSTAT);
		} while (!cfgstat);

		if (!write && (cfgstat & SYS_CFGSTAT_COMPLETE))
			*data = readl(vexpress_sysreg_base + SYS_CFGDATA);
		status = VEXPRESS_CONFIG_STATUS_DONE;

		if (cfgstat & SYS_CFGSTAT_ERR)
			status = -EINVAL;
	}

	return status;
}

struct vexpress_config_bridge_info vexpress_sysreg_config_bridge_info = {
	.name = "vexpress-sysreg",
	.func_get = vexpress_sysreg_config_func_get,
	.func_put = vexpress_sysreg_config_func_put,
	.func_exec = vexpress_sysreg_config_func_exec,
};

static void vexpress_sysreg_config_complete(unsigned long data)
{
	int status = VEXPRESS_CONFIG_STATUS_DONE;
	u32 cfgstat = readl(vexpress_sysreg_base + SYS_CFGSTAT);

	if (cfgstat & SYS_CFGSTAT_ERR)
		status = -EINVAL;
	if (!vexpress_sysreg_config_tries--)
		status = -ETIMEDOUT;

	if (status < 0) {
		dev_err(vexpress_sysreg_dev, "error %d\n", status);
	} else if (!(cfgstat & SYS_CFGSTAT_COMPLETE)) {
		mod_timer(&vexpress_sysreg_config_timer,
				jiffies + usecs_to_jiffies(50));
		return;
	}

	if (vexpress_sysreg_config_data) {
		*vexpress_sysreg_config_data = readl(vexpress_sysreg_base +
				SYS_CFGDATA);
		dev_dbg(vexpress_sysreg_dev, "read data %x\n",
				*vexpress_sysreg_config_data);
		vexpress_sysreg_config_data = NULL;
	}

	vexpress_config_complete(vexpress_sysreg_config_bridge, status);
}


void __init vexpress_sysreg_setup(struct device_node *node)
{
	if (WARN_ON(!vexpress_sysreg_base))
		return;

	if (readl(vexpress_sysreg_base + SYS_MISC) & SYS_MISC_MASTERSITE)
		vexpress_master_site = VEXPRESS_SITE_DB2;
	else
		vexpress_master_site = VEXPRESS_SITE_DB1;

	vexpress_sysreg_config_bridge = vexpress_config_bridge_register(
			node, &vexpress_sysreg_config_bridge_info);
	WARN_ON(!vexpress_sysreg_config_bridge);
}

void __init vexpress_sysreg_early_init(void __iomem *base)
{
	vexpress_sysreg_base = base;
	vexpress_sysreg_setup(NULL);
}

void __init vexpress_sysreg_of_early_init(void)
{
	struct device_node *node = of_find_compatible_node(NULL, NULL,
			"arm,vexpress-sysreg");

	if (node) {
		vexpress_sysreg_base = of_iomap(node, 0);
		vexpress_sysreg_setup(node);
	} else {
		pr_info("vexpress-sysreg: No Device Tree node found.");
	}
}


#define VEXPRESS_SYSREG_GPIO(_name, _reg, _value) \
	[VEXPRESS_GPIO_##_name] = { \
		.reg = _reg, \
		.value = _reg##_##_value, \
	}

static struct vexpress_sysreg_gpio {
	unsigned long reg;
	u32 value;
} vexpress_sysreg_gpios[] = {
	VEXPRESS_SYSREG_GPIO(MMC_CARDIN,	SYS_MCI,	CARDIN),
	VEXPRESS_SYSREG_GPIO(MMC_WPROT,		SYS_MCI,	WPROT),
	VEXPRESS_SYSREG_GPIO(FLASH_WPn,		SYS_FLASH,	WPn),
	VEXPRESS_SYSREG_GPIO(LED0,		SYS_LED,	LED(0)),
	VEXPRESS_SYSREG_GPIO(LED1,		SYS_LED,	LED(1)),
	VEXPRESS_SYSREG_GPIO(LED2,		SYS_LED,	LED(2)),
	VEXPRESS_SYSREG_GPIO(LED3,		SYS_LED,	LED(3)),
	VEXPRESS_SYSREG_GPIO(LED4,		SYS_LED,	LED(4)),
	VEXPRESS_SYSREG_GPIO(LED5,		SYS_LED,	LED(5)),
	VEXPRESS_SYSREG_GPIO(LED6,		SYS_LED,	LED(6)),
	VEXPRESS_SYSREG_GPIO(LED7,		SYS_LED,	LED(7)),
};

static int vexpress_sysreg_gpio_direction_input(struct gpio_chip *chip,
				       unsigned offset)
{
	return 0;
}

static int vexpress_sysreg_gpio_get(struct gpio_chip *chip,
				       unsigned offset)
{
	struct vexpress_sysreg_gpio *gpio = &vexpress_sysreg_gpios[offset];
	u32 reg_value = readl(vexpress_sysreg_base + gpio->reg);

	return !!(reg_value & gpio->value);
}

static void vexpress_sysreg_gpio_set(struct gpio_chip *chip,
				       unsigned offset, int value)
{
	struct vexpress_sysreg_gpio *gpio = &vexpress_sysreg_gpios[offset];
	u32 reg_value = readl(vexpress_sysreg_base + gpio->reg);

	if (value)
		reg_value |= gpio->value;
	else
		reg_value &= ~gpio->value;

	writel(reg_value, vexpress_sysreg_base + gpio->reg);
}

static int vexpress_sysreg_gpio_direction_output(struct gpio_chip *chip,
						unsigned offset, int value)
{
	vexpress_sysreg_gpio_set(chip, offset, value);

	return 0;
}

static struct gpio_chip vexpress_sysreg_gpio_chip = {
	.label = "vexpress-sysreg",
	.direction_input = vexpress_sysreg_gpio_direction_input,
	.direction_output = vexpress_sysreg_gpio_direction_output,
	.get = vexpress_sysreg_gpio_get,
	.set = vexpress_sysreg_gpio_set,
	.ngpio = ARRAY_SIZE(vexpress_sysreg_gpios),
	.base = 0,
};


#define VEXPRESS_SYSREG_GREEN_LED(_name, _default_trigger, _gpio) \
	{ \
		.name = "v2m:green:"_name, \
		.default_trigger = _default_trigger, \
		.gpio = VEXPRESS_GPIO_##_gpio, \
	}

struct gpio_led vexpress_sysreg_leds[] = {
	VEXPRESS_SYSREG_GREEN_LED("user1",	"heartbeat",	LED0),
	VEXPRESS_SYSREG_GREEN_LED("user2",	"mmc0",		LED1),
	VEXPRESS_SYSREG_GREEN_LED("user3",	"cpu0",		LED2),
	VEXPRESS_SYSREG_GREEN_LED("user4",	"cpu1",		LED3),
	VEXPRESS_SYSREG_GREEN_LED("user5",	"cpu2",		LED4),
	VEXPRESS_SYSREG_GREEN_LED("user6",	"cpu3",		LED5),
	VEXPRESS_SYSREG_GREEN_LED("user7",	"cpu4",		LED6),
	VEXPRESS_SYSREG_GREEN_LED("user8",	"cpu5",		LED7),
};

struct gpio_led_platform_data vexpress_sysreg_leds_pdata = {
	.num_leds = ARRAY_SIZE(vexpress_sysreg_leds),
	.leds = vexpress_sysreg_leds,
};


static ssize_t vexpress_sysreg_sys_id_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	return sprintf(buf, "0x%08x\n", readl(vexpress_sysreg_base + SYS_ID));
}

DEVICE_ATTR(sys_id, S_IRUGO, vexpress_sysreg_sys_id_show, NULL);

static int vexpress_sysreg_probe(struct platform_device *pdev)
{
	int err;
	struct resource *res = platform_get_resource(pdev,
			IORESOURCE_MEM, 0);

	if (!devm_request_mem_region(&pdev->dev, res->start,
			resource_size(res), pdev->name)) {
		dev_err(&pdev->dev, "Failed to request memory region!\n");
		return -EBUSY;
	}

	if (!vexpress_sysreg_base) {
		vexpress_sysreg_base = devm_ioremap(&pdev->dev, res->start,
				resource_size(res));
		vexpress_sysreg_setup(pdev->dev.of_node);
	}

	if (!vexpress_sysreg_base) {
		dev_err(&pdev->dev, "Failed to obtain base address!\n");
		return -EFAULT;
	}

	setup_timer(&vexpress_sysreg_config_timer,
			vexpress_sysreg_config_complete, 0);

	vexpress_sysreg_gpio_chip.dev = &pdev->dev;
	err = gpiochip_add(&vexpress_sysreg_gpio_chip);
	if (err) {
		vexpress_config_bridge_unregister(
				vexpress_sysreg_config_bridge);
		dev_err(&pdev->dev, "Failed to register GPIO chip! (%d)\n",
				err);
		return err;
	}

	platform_device_register_data(vexpress_sysreg_dev, "leds-gpio",
			PLATFORM_DEVID_AUTO, &vexpress_sysreg_leds_pdata,
			sizeof(vexpress_sysreg_leds_pdata));

	vexpress_sysreg_dev = &pdev->dev;

	device_create_file(vexpress_sysreg_dev, &dev_attr_sys_id);

	return 0;
}

static const struct of_device_id vexpress_sysreg_match[] = {
	{ .compatible = "arm,vexpress-sysreg", },
	{},
};

static struct platform_driver vexpress_sysreg_driver = {
	.driver = {
		.name = "vexpress-sysreg",
		.of_match_table = vexpress_sysreg_match,
	},
	.probe = vexpress_sysreg_probe,
};

static int __init vexpress_sysreg_init(void)
{
	return platform_driver_register(&vexpress_sysreg_driver);
}
core_initcall(vexpress_sysreg_init);
Commit	Line	Data
88e0abcd PM	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License version 2 as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* Copyright (C) 2012 ARM Limited
	12	*/
	13
	14	#include <linux/err.h>
	15	#include <linux/gpio.h>
	16	#include <linux/io.h>
	17	#include <linux/leds.h>
	18	#include <linux/of_address.h>
	19	#include <linux/platform_device.h>
	20	#include <linux/regulator/driver.h>
	21	#include <linux/slab.h>
	22	#include <linux/stat.h>
	23	#include <linux/timer.h>
	24	#include <linux/vexpress.h>
	25
	26	#define SYS_ID 0x000
	27	#define SYS_SW 0x004
	28	#define SYS_LED 0x008
	29	#define SYS_100HZ 0x024
	30	#define SYS_FLAGS 0x030
	31	#define SYS_FLAGSSET 0x030
	32	#define SYS_FLAGSCLR 0x034
	33	#define SYS_NVFLAGS 0x038
	34	#define SYS_NVFLAGSSET 0x038
	35	#define SYS_NVFLAGSCLR 0x03c
	36	#define SYS_MCI 0x048
	37	#define SYS_FLASH 0x04c
	38	#define SYS_CFGSW 0x058
	39	#define SYS_24MHZ 0x05c
	40	#define SYS_MISC 0x060
	41	#define SYS_DMA 0x064
	42	#define SYS_PROCID0 0x084
	43	#define SYS_PROCID1 0x088
	44	#define SYS_CFGDATA 0x0a0
	45	#define SYS_CFGCTRL 0x0a4
	46	#define SYS_CFGSTAT 0x0a8
	47
	48	#define SYS_HBI_MASK 0xfff
	49	#define SYS_ID_HBI_SHIFT 16
	50	#define SYS_PROCIDx_HBI_SHIFT 0
	51
8ea402f5 PM	52	#define SYS_LED_LED(n) (1 << (n))
8ea402f5 PM	53
88e0abcd PM	54	#define SYS_MCI_CARDIN (1 << 0)
	55	#define SYS_MCI_WPROT (1 << 1)
	56
	57	#define SYS_FLASH_WPn (1 << 0)
	58
	59	#define SYS_MISC_MASTERSITE (1 << 14)
	60
	61	#define SYS_CFGCTRL_START (1 << 31)
	62	#define SYS_CFGCTRL_WRITE (1 << 30)
	63	#define SYS_CFGCTRL_DCC(n) (((n) & 0xf) << 26)
	64	#define SYS_CFGCTRL_FUNC(n) (((n) & 0x3f) << 20)
	65	#define SYS_CFGCTRL_SITE(n) (((n) & 0x3) << 16)
	66	#define SYS_CFGCTRL_POSITION(n) (((n) & 0xf) << 12)
	67	#define SYS_CFGCTRL_DEVICE(n) (((n) & 0xfff) << 0)
	68
	69	#define SYS_CFGSTAT_ERR (1 << 1)
	70	#define SYS_CFGSTAT_COMPLETE (1 << 0)
	71
	72
	73	static void __iomem *vexpress_sysreg_base;
	74	static struct device *vexpress_sysreg_dev;
	75	static int vexpress_master_site;
	76
	77
	78	void vexpress_flags_set(u32 data)
	79	{
	80	writel(~0, vexpress_sysreg_base + SYS_FLAGSCLR);
	81	writel(data, vexpress_sysreg_base + SYS_FLAGSSET);
	82	}
	83
	84	u32 vexpress_get_procid(int site)
	85	{
	86	if (site == VEXPRESS_SITE_MASTER)
	87	site = vexpress_master_site;
	88
	89	return readl(vexpress_sysreg_base + (site == VEXPRESS_SITE_DB1 ?
	90	SYS_PROCID0 : SYS_PROCID1));
	91	}
	92
	93	u32 vexpress_get_hbi(int site)
	94	{
	95	u32 id;
	96
	97	switch (site) {
	98	case VEXPRESS_SITE_MB:
	99	id = readl(vexpress_sysreg_base + SYS_ID);
	100	return (id >> SYS_ID_HBI_SHIFT) & SYS_HBI_MASK;
	101	case VEXPRESS_SITE_MASTER:
	102	case VEXPRESS_SITE_DB1:
	103	case VEXPRESS_SITE_DB2:
	104	id = vexpress_get_procid(site);
	105	return (id >> SYS_PROCIDx_HBI_SHIFT) & SYS_HBI_MASK;
	106	}
	107
	108	return ~0;
	109	}
	110
	111	void __iomem *vexpress_get_24mhz_clock_base(void)
	112	{
	113	return vexpress_sysreg_base + SYS_24MHZ;
	114	}
	115
	116
	117	static void vexpress_sysreg_find_prop(struct device_node *node,
118	const char name, u32 val)
119	{
120	of_node_get(node);
121	while (node) {
122	if (of_property_read_u32(node, name, val) == 0) {
123	of_node_put(node);
124	return;
125	}
126	node = of_get_next_parent(node);
127	}
128	}
129
130	unsigned __vexpress_get_site(struct device dev, struct device_node node)
131	{
132	u32 site = 0;
133
134	WARN_ON(dev && node && dev->of_node != node);
135	if (dev && !node)
136	node = dev->of_node;
137
138	if (node) {
139	vexpress_sysreg_find_prop(node, "arm,vexpress,site", &site);
140	} else if (dev && dev->bus == &platform_bus_type) {
141	struct platform_device *pdev = to_platform_device(dev);
142
143	if (pdev->num_resources == 1 &&
144	pdev->resource[0].flags == IORESOURCE_BUS)
145	site = pdev->resource[0].start;
146	} else if (dev && strncmp(dev_name(dev), "ct:", 3) == 0) {
147	site = VEXPRESS_SITE_MASTER;
148	}
149
150	if (site == VEXPRESS_SITE_MASTER)
151	site = vexpress_master_site;
152
153	return site;
154	}
155
156
157	struct vexpress_sysreg_config_func {
158	u32 template;
159	u32 device;
160	};
161
162	static struct vexpress_config_bridge *vexpress_sysreg_config_bridge;
163	static struct timer_list vexpress_sysreg_config_timer;
164	static u32 *vexpress_sysreg_config_data;
165	static int vexpress_sysreg_config_tries;
166
167	static void vexpress_sysreg_config_func_get(struct device dev,
168	struct device_node *node)
169	{
170	struct vexpress_sysreg_config_func *config_func;
171	u32 site;
172	u32 position = 0;
173	u32 dcc = 0;
174	u32 func_device[2];
175	int err = -EFAULT;
176
177	if (node) {
178	of_node_get(node);
179	vexpress_sysreg_find_prop(node, "arm,vexpress,site", &site);
180	vexpress_sysreg_find_prop(node, "arm,vexpress,position",
181	&position);
182	vexpress_sysreg_find_prop(node, "arm,vexpress,dcc", &dcc);
183	err = of_property_read_u32_array(node,
184	"arm,vexpress-sysreg,func", func_device,
185	ARRAY_SIZE(func_device));
186	of_node_put(node);
187	} else if (dev && dev->bus == &platform_bus_type) {
188	struct platform_device *pdev = to_platform_device(dev);
189
190	if (pdev->num_resources == 1 &&
191	pdev->resource[0].flags == IORESOURCE_BUS) {
192	site = pdev->resource[0].start;
193	func_device[0] = pdev->resource[0].end;
194	func_device[1] = pdev->id;
195	err = 0;
196	}
197	}
198	if (err)
199	return NULL;
200
201	config_func = kzalloc(sizeof(*config_func), GFP_KERNEL);
202	if (!config_func)
203	return NULL;
204
205	config_func->template = SYS_CFGCTRL_DCC(dcc);
206	config_func->template \|= SYS_CFGCTRL_FUNC(func_device[0]);
207	config_func->template \|= SYS_CFGCTRL_SITE(site == VEXPRESS_SITE_MASTER ?
208	vexpress_master_site : site);
209	config_func->template \|= SYS_CFGCTRL_POSITION(position);
210	config_func->device \|= func_device[1];
211
212	dev_dbg(vexpress_sysreg_dev, "func 0x%p = 0x%x, %d\n", config_func,
213	config_func->template, config_func->device);
214
215	return config_func;
216	}
217
218	static void vexpress_sysreg_config_func_put(void *func)
219	{
220	kfree(func);
221	}
222
223	static int vexpress_sysreg_config_func_exec(void *func, int offset,
224	bool write, u32 *data)
225	{
226	int status;
227	struct vexpress_sysreg_config_func *config_func = func;
228	u32 command;
229
230	if (WARN_ON(!vexpress_sysreg_base))
231	return -ENOENT;
232
233	command = readl(vexpress_sysreg_base + SYS_CFGCTRL);
234	if (WARN_ON(command & SYS_CFGCTRL_START))
235	return -EBUSY;
236
237	command = SYS_CFGCTRL_START;
238	command \|= write ? SYS_CFGCTRL_WRITE : 0;
239	command \|= config_func->template;
240	command \|= SYS_CFGCTRL_DEVICE(config_func->device + offset);
241
242	/* Use a canary for reads */
243	if (!write)
244	*data = 0xdeadbeef;
245
246	dev_dbg(vexpress_sysreg_dev, "command %x, data %x\n",
247	command, *data);
248	writel(*data, vexpress_sysreg_base + SYS_CFGDATA);
249	writel(0, vexpress_sysreg_base + SYS_CFGSTAT);
250	writel(command, vexpress_sysreg_base + SYS_CFGCTRL);
251	mb();
252
253	if (vexpress_sysreg_dev) {
254	/* Schedule completion check */
255	if (!write)
256	vexpress_sysreg_config_data = data;
257	vexpress_sysreg_config_tries = 100;
258	mod_timer(&vexpress_sysreg_config_timer,
259	jiffies + usecs_to_jiffies(100));
260	status = VEXPRESS_CONFIG_STATUS_WAIT;
261	} else {
262	/* Early execution, no timer available, have to spin */
263	u32 cfgstat;
264
265	do {
266	cpu_relax();
267	cfgstat = readl(vexpress_sysreg_base + SYS_CFGSTAT);
268	} while (!cfgstat);
269
270	if (!write && (cfgstat & SYS_CFGSTAT_COMPLETE))
271	*data = readl(vexpress_sysreg_base + SYS_CFGDATA);
272	status = VEXPRESS_CONFIG_STATUS_DONE;
273
274	if (cfgstat & SYS_CFGSTAT_ERR)
275	status = -EINVAL;
276	}
277
278	return status;
279	}
280
281	struct vexpress_config_bridge_info vexpress_sysreg_config_bridge_info = {
282	.name = "vexpress-sysreg",
283	.func_get = vexpress_sysreg_config_func_get,
284	.func_put = vexpress_sysreg_config_func_put,
285	.func_exec = vexpress_sysreg_config_func_exec,
286	};
287
288	static void vexpress_sysreg_config_complete(unsigned long data)
289	{
290	int status = VEXPRESS_CONFIG_STATUS_DONE;
291	u32 cfgstat = readl(vexpress_sysreg_base + SYS_CFGSTAT);
292
293	if (cfgstat & SYS_CFGSTAT_ERR)
294	status = -EINVAL;
295	if (!vexpress_sysreg_config_tries--)
296	status = -ETIMEDOUT;
297
298	if (status < 0) {
299	dev_err(vexpress_sysreg_dev, "error %d\n", status);
300	} else if (!(cfgstat & SYS_CFGSTAT_COMPLETE)) {
301	mod_timer(&vexpress_sysreg_config_timer,
302	jiffies + usecs_to_jiffies(50));
303	return;
304	}
305
306	if (vexpress_sysreg_config_data) {
307	*vexpress_sysreg_config_data = readl(vexpress_sysreg_base +
308	SYS_CFGDATA);
309	dev_dbg(vexpress_sysreg_dev, "read data %x\n",
310	*vexpress_sysreg_config_data);
311	vexpress_sysreg_config_data = NULL;
312	}
313
314	vexpress_config_complete(vexpress_sysreg_config_bridge, status);
315	}
316
317
52666298	318	void __init vexpress_sysreg_setup(struct device_node *node)
88e0abcd	319	{
52666298	320	if (WARN_ON(!vexpress_sysreg_base))
88e0abcd PM	321	return;
88e0abcd PM	322
88e0abcd PM	323	if (readl(vexpress_sysreg_base + SYS_MISC) & SYS_MISC_MASTERSITE)
	324	vexpress_master_site = VEXPRESS_SITE_DB2;
	325	else
	326	vexpress_master_site = VEXPRESS_SITE_DB1;
	327
	328	vexpress_sysreg_config_bridge = vexpress_config_bridge_register(
	329	node, &vexpress_sysreg_config_bridge_info);
	330	WARN_ON(!vexpress_sysreg_config_bridge);
	331	}
	332
52666298 PM	333	void __init vexpress_sysreg_early_init(void __iomem *base)
	334	{
	335	vexpress_sysreg_base = base;
	336	vexpress_sysreg_setup(NULL);
	337	}
	338
88e0abcd PM	339	void __init vexpress_sysreg_of_early_init(void)
88e0abcd PM	340	{
52666298 PM	341	struct device_node *node = of_find_compatible_node(NULL, NULL,
	342	"arm,vexpress-sysreg");
	343
	344	if (node) {
	345	vexpress_sysreg_base = of_iomap(node, 0);
	346	vexpress_sysreg_setup(node);
	347	} else {
	348	pr_info("vexpress-sysreg: No Device Tree node found.");
	349	}
88e0abcd PM	350	}
	351
	352
8ea402f5 PM	353	#define VEXPRESS_SYSREG_GPIO(_name, _reg, _value) \
	354	[VEXPRESS_GPIO_##_name] = { \
	355	.reg = _reg, \
	356	.value = _reg##_##_value, \
	357	}
	358
88e0abcd PM	359	static struct vexpress_sysreg_gpio {
	360	unsigned long reg;
	361	u32 value;
	362	} vexpress_sysreg_gpios[] = {
8ea402f5 PM	363	VEXPRESS_SYSREG_GPIO(MMC_CARDIN, SYS_MCI, CARDIN),
	364	VEXPRESS_SYSREG_GPIO(MMC_WPROT, SYS_MCI, WPROT),
	365	VEXPRESS_SYSREG_GPIO(FLASH_WPn, SYS_FLASH, WPn),
	366	VEXPRESS_SYSREG_GPIO(LED0, SYS_LED, LED(0)),
	367	VEXPRESS_SYSREG_GPIO(LED1, SYS_LED, LED(1)),
	368	VEXPRESS_SYSREG_GPIO(LED2, SYS_LED, LED(2)),
	369	VEXPRESS_SYSREG_GPIO(LED3, SYS_LED, LED(3)),
	370	VEXPRESS_SYSREG_GPIO(LED4, SYS_LED, LED(4)),
	371	VEXPRESS_SYSREG_GPIO(LED5, SYS_LED, LED(5)),
	372	VEXPRESS_SYSREG_GPIO(LED6, SYS_LED, LED(6)),
	373	VEXPRESS_SYSREG_GPIO(LED7, SYS_LED, LED(7)),
88e0abcd PM	374	};
	375
	376	static int vexpress_sysreg_gpio_direction_input(struct gpio_chip *chip,
	377	unsigned offset)
	378	{
	379	return 0;
	380	}
	381
88e0abcd PM	382	static int vexpress_sysreg_gpio_get(struct gpio_chip *chip,
	383	unsigned offset)
	384	{
	385	struct vexpress_sysreg_gpio *gpio = &vexpress_sysreg_gpios[offset];
	386	u32 reg_value = readl(vexpress_sysreg_base + gpio->reg);
	387
	388	return !!(reg_value & gpio->value);
	389	}
	390
	391	static void vexpress_sysreg_gpio_set(struct gpio_chip *chip,
	392	unsigned offset, int value)
	393	{
	394	struct vexpress_sysreg_gpio *gpio = &vexpress_sysreg_gpios[offset];
	395	u32 reg_value = readl(vexpress_sysreg_base + gpio->reg);
	396
	397	if (value)
	398	reg_value \|= gpio->value;
	399	else
	400	reg_value &= ~gpio->value;
	401
	402	writel(reg_value, vexpress_sysreg_base + gpio->reg);
	403	}
	404
8ea402f5 PM	405	static int vexpress_sysreg_gpio_direction_output(struct gpio_chip *chip,
	406	unsigned offset, int value)
	407	{
	408	vexpress_sysreg_gpio_set(chip, offset, value);
	409
	410	return 0;
	411	}
	412
88e0abcd PM	413	static struct gpio_chip vexpress_sysreg_gpio_chip = {
	414	.label = "vexpress-sysreg",
	415	.direction_input = vexpress_sysreg_gpio_direction_input,
	416	.direction_output = vexpress_sysreg_gpio_direction_output,
	417	.get = vexpress_sysreg_gpio_get,
	418	.set = vexpress_sysreg_gpio_set,
	419	.ngpio = ARRAY_SIZE(vexpress_sysreg_gpios),
	420	.base = 0,
	421	};
	422
	423
8ea402f5 PM	424	#define VEXPRESS_SYSREG_GREEN_LED(_name, _default_trigger, _gpio) \
	425	{ \
	426	.name = "v2m:green:"_name, \
	427	.default_trigger = _default_trigger, \
	428	.gpio = VEXPRESS_GPIO_##_gpio, \
	429	}
	430
	431	struct gpio_led vexpress_sysreg_leds[] = {
	432	VEXPRESS_SYSREG_GREEN_LED("user1", "heartbeat", LED0),
	433	VEXPRESS_SYSREG_GREEN_LED("user2", "mmc0", LED1),
	434	VEXPRESS_SYSREG_GREEN_LED("user3", "cpu0", LED2),
	435	VEXPRESS_SYSREG_GREEN_LED("user4", "cpu1", LED3),
	436	VEXPRESS_SYSREG_GREEN_LED("user5", "cpu2", LED4),
	437	VEXPRESS_SYSREG_GREEN_LED("user6", "cpu3", LED5),
	438	VEXPRESS_SYSREG_GREEN_LED("user7", "cpu4", LED6),
	439	VEXPRESS_SYSREG_GREEN_LED("user8", "cpu5", LED7),
	440	};
	441
	442	struct gpio_led_platform_data vexpress_sysreg_leds_pdata = {
	443	.num_leds = ARRAY_SIZE(vexpress_sysreg_leds),
	444	.leds = vexpress_sysreg_leds,
	445	};
	446
	447
88e0abcd PM	448	static ssize_t vexpress_sysreg_sys_id_show(struct device *dev,
	449	struct device_attribute attr, char buf)
	450	{
	451	return sprintf(buf, "0x%08x\n", readl(vexpress_sysreg_base + SYS_ID));
	452	}
	453
	454	DEVICE_ATTR(sys_id, S_IRUGO, vexpress_sysreg_sys_id_show, NULL);
	455
612b95cd	456	static int vexpress_sysreg_probe(struct platform_device *pdev)
88e0abcd PM	457	{
	458	int err;
	459	struct resource *res = platform_get_resource(pdev,
	460	IORESOURCE_MEM, 0);
	461
	462	if (!devm_request_mem_region(&pdev->dev, res->start,
	463	resource_size(res), pdev->name)) {
	464	dev_err(&pdev->dev, "Failed to request memory region!\n");
	465	return -EBUSY;
	466	}
	467
52666298	468	if (!vexpress_sysreg_base) {
88e0abcd PM	469	vexpress_sysreg_base = devm_ioremap(&pdev->dev, res->start,
88e0abcd PM	470	resource_size(res));
52666298 PM	471	vexpress_sysreg_setup(pdev->dev.of_node);
52666298 PM	472	}
88e0abcd PM	473
	474	if (!vexpress_sysreg_base) {
	475	dev_err(&pdev->dev, "Failed to obtain base address!\n");
	476	return -EFAULT;
	477	}
	478
	479	setup_timer(&vexpress_sysreg_config_timer,
	480	vexpress_sysreg_config_complete, 0);
	481
	482	vexpress_sysreg_gpio_chip.dev = &pdev->dev;
	483	err = gpiochip_add(&vexpress_sysreg_gpio_chip);
	484	if (err) {
	485	vexpress_config_bridge_unregister(
	486	vexpress_sysreg_config_bridge);
	487	dev_err(&pdev->dev, "Failed to register GPIO chip! (%d)\n",
	488	err);
	489	return err;
	490	}
	491
8ea402f5 PM	492	platform_device_register_data(vexpress_sysreg_dev, "leds-gpio",
	493	PLATFORM_DEVID_AUTO, &vexpress_sysreg_leds_pdata,
	494	sizeof(vexpress_sysreg_leds_pdata));
	495
88e0abcd PM	496	vexpress_sysreg_dev = &pdev->dev;
	497
	498	device_create_file(vexpress_sysreg_dev, &dev_attr_sys_id);
	499
	500	return 0;
	501	}
	502
	503	static const struct of_device_id vexpress_sysreg_match[] = {
	504	{ .compatible = "arm,vexpress-sysreg", },
	505	{},
	506	};
	507
	508	static struct platform_driver vexpress_sysreg_driver = {
	509	.driver = {
	510	.name = "vexpress-sysreg",
	511	.of_match_table = vexpress_sysreg_match,
	512	},
	513	.probe = vexpress_sysreg_probe,
	514	};
	515
	516	static int __init vexpress_sysreg_init(void)
	517	{
	518	return platform_driver_register(&vexpress_sysreg_driver);
	519	}
	520	core_initcall(vexpress_sysreg_init);