[linux.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/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 <[email protected]>");
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>
5e63dcc7 EA	17	#include <linux/module.h>
	18	#include <linux/platform_device.h>
	19	#include <dt-bindings/clock/bcm2835-aux.h>
	20
	21	#define BCM2835_AUXIRQ 0x00
	22	#define BCM2835_AUXENB 0x04
	23
	24	static int bcm2835_aux_clk_probe(struct platform_device *pdev)
	25	{
	26	struct device *dev = &pdev->dev;
b19f009d	27	struct clk_hw_onecell_data *onecell;
5e63dcc7 EA	28	const char *parent;
	29	struct clk *parent_clk;
	30	struct resource *res;
	31	void __iomem reg, gate;
	32
	33	parent_clk = devm_clk_get(dev, NULL);
	34	if (IS_ERR(parent_clk))
	35	return PTR_ERR(parent_clk);
	36	parent = __clk_get_name(parent_clk);
	37
	38	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	39	reg = devm_ioremap_resource(dev, res);
4d3ac666 VZ	40	if (IS_ERR(reg))
4d3ac666 VZ	41	return PTR_ERR(reg);
5e63dcc7	42
b19f009d SB	43	onecell = devm_kmalloc(dev, sizeof(onecell) + sizeof(onecell->hws) *
b19f009d SB	44	BCM2835_AUX_CLOCK_COUNT, GFP_KERNEL);
5e63dcc7 EA	45	if (!onecell)
5e63dcc7 EA	46	return -ENOMEM;
b19f009d	47	onecell->num = BCM2835_AUX_CLOCK_COUNT;
5e63dcc7 EA	48
5e63dcc7 EA	49	gate = reg + BCM2835_AUXENB;
b19f009d SB	50	onecell->hws[BCM2835_AUX_CLOCK_UART] =
b19f009d SB	51	clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
5e63dcc7	52
b19f009d SB	53	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
b19f009d SB	54	clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
5e63dcc7	55
b19f009d SB	56	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
b19f009d SB	57	clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
5e63dcc7	58
b19f009d SB	59	return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
b19f009d SB	60	onecell);
5e63dcc7 EA	61	}
	62
	63	static const struct of_device_id bcm2835_aux_clk_of_match[] = {
	64	{ .compatible = "brcm,bcm2835-aux", },
	65	{},
	66	};
	67	MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
	68
	69	static struct platform_driver bcm2835_aux_clk_driver = {
	70	.driver = {
	71	.name = "bcm2835-aux-clk",
	72	.of_match_table = bcm2835_aux_clk_of_match,
	73	},
	74	.probe = bcm2835_aux_clk_probe,
	75	};
	76	builtin_platform_driver(bcm2835_aux_clk_driver);
	77
	78	MODULE_AUTHOR("Eric Anholt <[email protected]>");
	79	MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
	80	MODULE_LICENSE("GPL v2");