[deliverable/linux.git] / drivers / clk / sunxi / clk-sun8i-apb0.c

/*
 * Copyright (C) 2014 Chen-Yu Tsai
 * Author: Chen-Yu Tsai <wens@csie.org>
 *
 * Allwinner A23 APB0 clock driver
 *
 * License Terms: GNU General Public License v2
 *
 * Based on clk-sun6i-apb0.c
 * Allwinner A31 APB0 clock driver
 *
 * Copyright (C) 2014 Free Electrons
 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
 *
 */

#include <linux/clk-provider.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/platform_device.h>

static struct clk *sun8i_a23_apb0_register(struct device_node *node,
					   void __iomem *reg)
{
	const char *clk_name = node->name;
	const char *clk_parent;
	struct clk *clk;
	int ret;

	clk_parent = of_clk_get_parent_name(node, 0);
	if (!clk_parent)
		return ERR_PTR(-EINVAL);

	of_property_read_string(node, "clock-output-names", &clk_name);

	/* The A23 APB0 clock is a standard 2 bit wide divider clock */
	clk = clk_register_divider(NULL, clk_name, clk_parent, 0, reg,
				   0, 2, 0, NULL);
	if (IS_ERR(clk))
		return clk;

	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
	if (ret)
		goto err_unregister;

	return clk;

err_unregister:
	clk_unregister_divider(clk);

	return ERR_PTR(ret);
}

static void sun8i_a23_apb0_setup(struct device_node *node)
{
	void __iomem *reg;
	struct resource res;
	struct clk *clk;

	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
	if (IS_ERR(reg)) {
		/*
		 * This happens with clk nodes instantiated through mfd,
		 * as those do not have their resources assigned in the
		 * device tree. Do not print an error in this case.
		 */
		if (PTR_ERR(reg) != -EINVAL)
			pr_err("Could not get registers for a23-apb0-clk\n");

		return;
	}

	clk = sun8i_a23_apb0_register(node, reg);
	if (IS_ERR(clk))
		goto err_unmap;

	return;

err_unmap:
	iounmap(reg);
	of_address_to_resource(node, 0, &res);
	release_mem_region(res.start, resource_size(&res));
}
CLK_OF_DECLARE_DRIVER(sun8i_a23_apb0, "allwinner,sun8i-a23-apb0-clk",
		      sun8i_a23_apb0_setup);

static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
{
	struct device_node *np = pdev->dev.of_node;
	struct resource *r;
	void __iomem *reg;
	struct clk *clk;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	reg = devm_ioremap_resource(&pdev->dev, r);
	if (IS_ERR(reg))
		return PTR_ERR(reg);

	clk = sun8i_a23_apb0_register(np, reg);
	if (IS_ERR(clk))
		return PTR_ERR(clk);

	return 0;
}

static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
	{ .compatible = "allwinner,sun8i-a23-apb0-clk" },
	{ /* sentinel */ }
};

static struct platform_driver sun8i_a23_apb0_clk_driver = {
	.driver = {
		.name = "sun8i-a23-apb0-clk",
		.of_match_table = sun8i_a23_apb0_clk_dt_ids,
	},
	.probe = sun8i_a23_apb0_clk_probe,
};
builtin_platform_driver(sun8i_a23_apb0_clk_driver);
Commit	Line	Data
57a1fbf2 CYT	1	/*
	2	* Copyright (C) 2014 Chen-Yu Tsai
	3	* Author: Chen-Yu Tsai <wens@csie.org>
	4	*
	5	* Allwinner A23 APB0 clock driver
	6	*
	7	* License Terms: GNU General Public License v2
	8	*
	9	* Based on clk-sun6i-apb0.c
	10	* Allwinner A31 APB0 clock driver
	11	*
	12	* Copyright (C) 2014 Free Electrons
	13	* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
	14	*
	15	*/
	16
	17	#include <linux/clk-provider.h>
439a36d7	18	#include <linux/init.h>
57a1fbf2	19	#include <linux/of.h>
fd9ffd8b	20	#include <linux/of_address.h>
57a1fbf2 CYT	21	#include <linux/platform_device.h>
57a1fbf2 CYT	22
fd9ffd8b CYT	23	static struct clk sun8i_a23_apb0_register(struct device_node node,
	24	void __iomem *reg)
	25	{
	26	const char *clk_name = node->name;
	27	const char *clk_parent;
	28	struct clk *clk;
	29	int ret;
	30
	31	clk_parent = of_clk_get_parent_name(node, 0);
	32	if (!clk_parent)
	33	return ERR_PTR(-EINVAL);
	34
	35	of_property_read_string(node, "clock-output-names", &clk_name);
	36
	37	/* The A23 APB0 clock is a standard 2 bit wide divider clock */
	38	clk = clk_register_divider(NULL, clk_name, clk_parent, 0, reg,
33f60d02	39	0, 2, 0, NULL);
fd9ffd8b CYT	40	if (IS_ERR(clk))
	41	return clk;
	42
	43	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
	44	if (ret)
	45	goto err_unregister;
	46
	47	return clk;
	48
	49	err_unregister:
	50	clk_unregister_divider(clk);
	51
	52	return ERR_PTR(ret);
	53	}
	54
	55	static void sun8i_a23_apb0_setup(struct device_node *node)
	56	{
	57	void __iomem *reg;
	58	struct resource res;
	59	struct clk *clk;
	60
	61	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
	62	if (IS_ERR(reg)) {
	63	/*
	64	* This happens with clk nodes instantiated through mfd,
	65	* as those do not have their resources assigned in the
	66	* device tree. Do not print an error in this case.
	67	*/
	68	if (PTR_ERR(reg) != -EINVAL)
	69	pr_err("Could not get registers for a23-apb0-clk\n");
	70
	71	return;
	72	}
	73
	74	clk = sun8i_a23_apb0_register(node, reg);
	75	if (IS_ERR(clk))
	76	goto err_unmap;
	77
	78	return;
	79
	80	err_unmap:
	81	iounmap(reg);
	82	of_address_to_resource(node, 0, &res);
	83	release_mem_region(res.start, resource_size(&res));
	84	}
915128b6 RRD	85	CLK_OF_DECLARE_DRIVER(sun8i_a23_apb0, "allwinner,sun8i-a23-apb0-clk",
915128b6 RRD	86	sun8i_a23_apb0_setup);
fd9ffd8b	87
57a1fbf2 CYT	88	static int sun8i_a23_apb0_clk_probe(struct platform_device *pdev)
	89	{
	90	struct device_node *np = pdev->dev.of_node;
57a1fbf2 CYT	91	struct resource *r;
	92	void __iomem *reg;
	93	struct clk *clk;
	94
	95	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	96	reg = devm_ioremap_resource(&pdev->dev, r);
	97	if (IS_ERR(reg))
	98	return PTR_ERR(reg);
	99
fd9ffd8b	100	clk = sun8i_a23_apb0_register(np, reg);
57a1fbf2 CYT	101	if (IS_ERR(clk))
	102	return PTR_ERR(clk);
	103
fd9ffd8b	104	return 0;
57a1fbf2 CYT	105	}
57a1fbf2 CYT	106
381c1ccd	107	static const struct of_device_id sun8i_a23_apb0_clk_dt_ids[] = {
57a1fbf2 CYT	108	{ .compatible = "allwinner,sun8i-a23-apb0-clk" },
	109	{ /* sentinel */ }
	110	};
	111
	112	static struct platform_driver sun8i_a23_apb0_clk_driver = {
	113	.driver = {
	114	.name = "sun8i-a23-apb0-clk",
57a1fbf2 CYT	115	.of_match_table = sun8i_a23_apb0_clk_dt_ids,
	116	},
	117	.probe = sun8i_a23_apb0_clk_probe,
	118	};
439a36d7	119	builtin_platform_driver(sun8i_a23_apb0_clk_driver);