[linux-2.6-block.git] / drivers / reset / reset-socfpga.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2018, Intel Corporation
 * Copied from reset-sunxi.c
 */

#include <linux/err.h>
#include <linux/io.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/reset/socfpga.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/types.h>

#include "reset-simple.h"

#define SOCFPGA_NR_BANKS	8

static int a10_reset_init(struct device_node *np)
{
	struct reset_simple_data *data;
	struct resource res;
	resource_size_t size;
	int ret;
	u32 reg_offset = 0x10;

	data = kzalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	ret = of_address_to_resource(np, 0, &res);
	if (ret)
		goto err_alloc;

	size = resource_size(&res);
	if (!request_mem_region(res.start, size, np->name)) {
		ret = -EBUSY;
		goto err_alloc;
	}

	data->membase = ioremap(res.start, size);
	if (!data->membase) {
		ret = -ENOMEM;
		goto err_alloc;
	}

	if (of_property_read_u32(np, "altr,modrst-offset", &reg_offset))
		pr_warn("missing altr,modrst-offset property, assuming 0x10\n");
	data->membase += reg_offset;

	spin_lock_init(&data->lock);

	data->rcdev.owner = THIS_MODULE;
	data->rcdev.nr_resets = SOCFPGA_NR_BANKS * 32;
	data->rcdev.ops = &reset_simple_ops;
	data->rcdev.of_node = np;
	data->status_active_low = true;

	return reset_controller_register(&data->rcdev);

err_alloc:
	kfree(data);
	return ret;
};

/*
 * These are the reset controller we need to initialize early on in
 * our system, before we can even think of using a regular device
 * driver for it.
 * The controllers that we can register through the regular device
 * model are handled by the simple reset driver directly.
 */
static const struct of_device_id socfpga_early_reset_dt_ids[] __initconst = {
	{ .compatible = "altr,rst-mgr", },
	{ /* sentinel */ },
};

void __init socfpga_reset_init(void)
{
	struct device_node *np;

	for_each_matching_node(np, socfpga_early_reset_dt_ids)
		a10_reset_init(np);
}
Commit	Line	Data
b3ca9888 DN	1	// SPDX-License-Identifier: GPL-2.0
	2	/*
	3	* Copyright (C) 2018, Intel Corporation
	4	* Copied from reset-sunxi.c
	5	*/
	6
	7	#include <linux/err.h>
	8	#include <linux/io.h>
	9	#include <linux/init.h>
	10	#include <linux/of.h>
	11	#include <linux/of_address.h>
	12	#include <linux/platform_device.h>
	13	#include <linux/reset-controller.h>
cdbeb315	14	#include <linux/reset/socfpga.h>
b3ca9888 DN	15	#include <linux/slab.h>
	16	#include <linux/spinlock.h>
	17	#include <linux/types.h>
	18
	19	#include "reset-simple.h"
	20
	21	#define SOCFPGA_NR_BANKS 8
b3ca9888 DN	22
	23	static int a10_reset_init(struct device_node *np)
	24	{
	25	struct reset_simple_data *data;
	26	struct resource res;
	27	resource_size_t size;
	28	int ret;
	29	u32 reg_offset = 0x10;
	30
	31	data = kzalloc(sizeof(*data), GFP_KERNEL);
	32	if (!data)
	33	return -ENOMEM;
	34
	35	ret = of_address_to_resource(np, 0, &res);
	36	if (ret)
	37	goto err_alloc;
	38
	39	size = resource_size(&res);
	40	if (!request_mem_region(res.start, size, np->name)) {
	41	ret = -EBUSY;
	42	goto err_alloc;
	43	}
	44
	45	data->membase = ioremap(res.start, size);
	46	if (!data->membase) {
	47	ret = -ENOMEM;
	48	goto err_alloc;
	49	}
	50
	51	if (of_property_read_u32(np, "altr,modrst-offset", &reg_offset))
	52	pr_warn("missing altr,modrst-offset property, assuming 0x10\n");
	53	data->membase += reg_offset;
	54
	55	spin_lock_init(&data->lock);
	56
	57	data->rcdev.owner = THIS_MODULE;
	58	data->rcdev.nr_resets = SOCFPGA_NR_BANKS * 32;
	59	data->rcdev.ops = &reset_simple_ops;
	60	data->rcdev.of_node = np;
	61	data->status_active_low = true;
	62
	63	return reset_controller_register(&data->rcdev);
	64
	65	err_alloc:
	66	kfree(data);
	67	return ret;
	68	};
	69
	70	/*
	71	* These are the reset controller we need to initialize early on in
	72	* our system, before we can even think of using a regular device
	73	* driver for it.
	74	* The controllers that we can register through the regular device
	75	* model are handled by the simple reset driver directly.
	76	*/
	77	static const struct of_device_id socfpga_early_reset_dt_ids[] __initconst = {
	78	{ .compatible = "altr,rst-mgr", },
	79	{ /* sentinel */ },
	80	};
	81
	82	void __init socfpga_reset_init(void)
	83	{
	84	struct device_node *np;
	85
86	for_each_matching_node(np, socfpga_early_reset_dt_ids)
87	a10_reset_init(np);
88	}