[linux-2.6-block.git] / drivers / clk / bcm / clk-bcm2835-aux.c

/*
 * Copyright (C) 2015 Broadcom
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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.
 */

#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/clk/bcm2835.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <dt-bindings/clock/bcm2835-aux.h>

#define BCM2835_AUXIRQ		0x00
#define BCM2835_AUXENB		0x04

static int bcm2835_aux_clk_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct clk_hw_onecell_data *onecell;
	const char *parent;
	struct clk *parent_clk;
	struct resource *res;
	void __iomem *reg, *gate;

	parent_clk = devm_clk_get(dev, NULL);
	if (IS_ERR(parent_clk))
		return PTR_ERR(parent_clk);
	parent = __clk_get_name(parent_clk);

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	reg = devm_ioremap_resource(dev, res);
	if (IS_ERR(reg))
		return PTR_ERR(reg);

	onecell = devm_kmalloc(dev, sizeof(*onecell) + sizeof(*onecell->hws) *
			       BCM2835_AUX_CLOCK_COUNT, GFP_KERNEL);
	if (!onecell)
		return -ENOMEM;
	onecell->num = BCM2835_AUX_CLOCK_COUNT;

	gate = reg + BCM2835_AUXENB;
	onecell->hws[BCM2835_AUX_CLOCK_UART] =
		clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);

	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
		clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);

	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
		clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);

	return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
				      onecell);
}

static const struct of_device_id bcm2835_aux_clk_of_match[] = {
	{ .compatible = "brcm,bcm2835-aux", },
	{},
};
MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);

static struct platform_driver bcm2835_aux_clk_driver = {
	.driver = {
		.name = "bcm2835-aux-clk",
		.of_match_table = bcm2835_aux_clk_of_match,
	},
	.probe          = bcm2835_aux_clk_probe,
};
builtin_platform_driver(bcm2835_aux_clk_driver);

MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
5e63dcc7 EA	1	/*
	2	* Copyright (C) 2015 Broadcom
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation; either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*/
	14
	15	#include <linux/clk.h>
	16	#include <linux/clk-provider.h>
	17	#include <linux/clk/bcm2835.h>
	18	#include <linux/module.h>
	19	#include <linux/platform_device.h>
	20	#include <dt-bindings/clock/bcm2835-aux.h>
	21
	22	#define BCM2835_AUXIRQ 0x00
	23	#define BCM2835_AUXENB 0x04
	24
	25	static int bcm2835_aux_clk_probe(struct platform_device *pdev)
	26	{
	27	struct device *dev = &pdev->dev;
b19f009d	28	struct clk_hw_onecell_data *onecell;
5e63dcc7 EA	29	const char *parent;
	30	struct clk *parent_clk;
	31	struct resource *res;
	32	void __iomem reg, gate;
	33
	34	parent_clk = devm_clk_get(dev, NULL);
	35	if (IS_ERR(parent_clk))
	36	return PTR_ERR(parent_clk);
	37	parent = __clk_get_name(parent_clk);
	38
	39	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	40	reg = devm_ioremap_resource(dev, res);
4d3ac666 VZ	41	if (IS_ERR(reg))
4d3ac666 VZ	42	return PTR_ERR(reg);
5e63dcc7	43
b19f009d SB	44	onecell = devm_kmalloc(dev, sizeof(onecell) + sizeof(onecell->hws) *
b19f009d SB	45	BCM2835_AUX_CLOCK_COUNT, GFP_KERNEL);
5e63dcc7 EA	46	if (!onecell)
5e63dcc7 EA	47	return -ENOMEM;
b19f009d	48	onecell->num = BCM2835_AUX_CLOCK_COUNT;
5e63dcc7 EA	49
5e63dcc7 EA	50	gate = reg + BCM2835_AUXENB;
b19f009d SB	51	onecell->hws[BCM2835_AUX_CLOCK_UART] =
b19f009d SB	52	clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
5e63dcc7	53
b19f009d SB	54	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
b19f009d SB	55	clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
5e63dcc7	56
b19f009d SB	57	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
b19f009d SB	58	clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
5e63dcc7	59
b19f009d SB	60	return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
b19f009d SB	61	onecell);
5e63dcc7 EA	62	}
	63
	64	static const struct of_device_id bcm2835_aux_clk_of_match[] = {
	65	{ .compatible = "brcm,bcm2835-aux", },
	66	{},
	67	};
	68	MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
	69
	70	static struct platform_driver bcm2835_aux_clk_driver = {
	71	.driver = {
	72	.name = "bcm2835-aux-clk",
	73	.of_match_table = bcm2835_aux_clk_of_match,
	74	},
	75	.probe = bcm2835_aux_clk_probe,
	76	};
	77	builtin_platform_driver(bcm2835_aux_clk_driver);
	78
	79	MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
	80	MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
	81	MODULE_LICENSE("GPL v2");