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
25static int bcm2835_aux_clk_probe(struct platform_device *pdev)
26{
27	struct device *dev = &pdev->dev;
28	struct clk_hw_onecell_data *onecell;
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);
41	if (IS_ERR(reg))
42		return PTR_ERR(reg);
43
44	onecell = devm_kmalloc(dev, sizeof(*onecell) + sizeof(*onecell->hws) *
45			       BCM2835_AUX_CLOCK_COUNT, GFP_KERNEL);
46	if (!onecell)
47		return -ENOMEM;
48	onecell->num = BCM2835_AUX_CLOCK_COUNT;
49
50	gate = reg + BCM2835_AUXENB;
51	onecell->hws[BCM2835_AUX_CLOCK_UART] =
52		clk_hw_register_gate(dev, "aux_uart", parent, 0, gate, 0, 0, NULL);
53
54	onecell->hws[BCM2835_AUX_CLOCK_SPI1] =
55		clk_hw_register_gate(dev, "aux_spi1", parent, 0, gate, 1, 0, NULL);
56
57	onecell->hws[BCM2835_AUX_CLOCK_SPI2] =
58		clk_hw_register_gate(dev, "aux_spi2", parent, 0, gate, 2, 0, NULL);
59
60	return of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
61				      onecell);
62}
63
64static const struct of_device_id bcm2835_aux_clk_of_match[] = {
65	{ .compatible = "brcm,bcm2835-aux", },
66	{},
67};
68MODULE_DEVICE_TABLE(of, bcm2835_aux_clk_of_match);
69
70static 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};
77builtin_platform_driver(bcm2835_aux_clk_driver);
78
79MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
80MODULE_DESCRIPTION("BCM2835 auxiliary peripheral clock driver");
81MODULE_LICENSE("GPL v2");