1/*
  2 * Copyright (C) 2014 Free Electrons
  3 *
  4 * License Terms: GNU General Public License v2
  5 * Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
  6 *
  7 * Allwinner PRCM (Power/Reset/Clock Management) driver
  8 *
  9 */
 10
 11#include <linux/mfd/core.h>
 12#include <linux/init.h>
 13#include <linux/of.h>
 14
 15struct prcm_data {
 16	int nsubdevs;
 17	const struct mfd_cell *subdevs;
 18};
 19
 20static const struct resource sun6i_a31_ar100_clk_res[] = {
 21	{
 22		.start = 0x0,
 23		.end = 0x3,
 24		.flags = IORESOURCE_MEM,
 25	},
 26};
 27
 28static const struct resource sun6i_a31_apb0_clk_res[] = {
 29	{
 30		.start = 0xc,
 31		.end = 0xf,
 32		.flags = IORESOURCE_MEM,
 33	},
 34};
 35
 36static const struct resource sun6i_a31_apb0_gates_clk_res[] = {
 37	{
 38		.start = 0x28,
 39		.end = 0x2b,
 40		.flags = IORESOURCE_MEM,
 41	},
 42};
 43
 44static const struct resource sun6i_a31_ir_clk_res[] = {
 45	{
 46		.start = 0x54,
 47		.end = 0x57,
 48		.flags = IORESOURCE_MEM,
 49	},
 50};
 51
 52static const struct resource sun6i_a31_apb0_rstc_res[] = {
 53	{
 54		.start = 0xb0,
 55		.end = 0xb3,
 56		.flags = IORESOURCE_MEM,
 57	},
 58};
 59
 60static const struct mfd_cell sun6i_a31_prcm_subdevs[] = {
 61	{
 62		.name = "sun6i-a31-ar100-clk",
 63		.of_compatible = "allwinner,sun6i-a31-ar100-clk",
 64		.num_resources = ARRAY_SIZE(sun6i_a31_ar100_clk_res),
 65		.resources = sun6i_a31_ar100_clk_res,
 66	},
 67	{
 68		.name = "sun6i-a31-apb0-clk",
 69		.of_compatible = "allwinner,sun6i-a31-apb0-clk",
 70		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
 71		.resources = sun6i_a31_apb0_clk_res,
 72	},
 73	{
 74		.name = "sun6i-a31-apb0-gates-clk",
 75		.of_compatible = "allwinner,sun6i-a31-apb0-gates-clk",
 76		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
 77		.resources = sun6i_a31_apb0_gates_clk_res,
 78	},
 79	{
 80		.name = "sun6i-a31-ir-clk",
 81		.of_compatible = "allwinner,sun4i-a10-mod0-clk",
 82		.num_resources = ARRAY_SIZE(sun6i_a31_ir_clk_res),
 83		.resources = sun6i_a31_ir_clk_res,
 84	},
 85	{
 86		.name = "sun6i-a31-apb0-clock-reset",
 87		.of_compatible = "allwinner,sun6i-a31-clock-reset",
 88		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
 89		.resources = sun6i_a31_apb0_rstc_res,
 90	},
 91};
 92
 93static const struct mfd_cell sun8i_a23_prcm_subdevs[] = {
 94	{
 95		.name = "sun8i-a23-apb0-clk",
 96		.of_compatible = "allwinner,sun8i-a23-apb0-clk",
 97		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_clk_res),
 98		.resources = sun6i_a31_apb0_clk_res,
 99	},
100	{
101		.name = "sun6i-a31-apb0-gates-clk",
102		.of_compatible = "allwinner,sun8i-a23-apb0-gates-clk",
103		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_gates_clk_res),
104		.resources = sun6i_a31_apb0_gates_clk_res,
105	},
106	{
107		.name = "sun6i-a31-apb0-clock-reset",
108		.of_compatible = "allwinner,sun6i-a31-clock-reset",
109		.num_resources = ARRAY_SIZE(sun6i_a31_apb0_rstc_res),
110		.resources = sun6i_a31_apb0_rstc_res,
111	},
112};
113
114static const struct prcm_data sun6i_a31_prcm_data = {
115	.nsubdevs = ARRAY_SIZE(sun6i_a31_prcm_subdevs),
116	.subdevs = sun6i_a31_prcm_subdevs,
117};
118
119static const struct prcm_data sun8i_a23_prcm_data = {
120	.nsubdevs = ARRAY_SIZE(sun8i_a23_prcm_subdevs),
121	.subdevs = sun8i_a23_prcm_subdevs,
122};
123
124static const struct of_device_id sun6i_prcm_dt_ids[] = {
125	{
126		.compatible = "allwinner,sun6i-a31-prcm",
127		.data = &sun6i_a31_prcm_data,
128	},
129	{
130		.compatible = "allwinner,sun8i-a23-prcm",
131		.data = &sun8i_a23_prcm_data,
132	},
133	{ /* sentinel */ },
134};
135
136static int sun6i_prcm_probe(struct platform_device *pdev)
137{
138	struct device_node *np = pdev->dev.of_node;
139	const struct of_device_id *match;
140	const struct prcm_data *data;
141	struct resource *res;
142	int ret;
143
144	match = of_match_node(sun6i_prcm_dt_ids, np);
145	if (!match)
146		return -EINVAL;
147
148	data = match->data;
149
150	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
151	if (!res) {
152		dev_err(&pdev->dev, "no prcm memory region provided\n");
153		return -ENOENT;
154	}
155
156	ret = mfd_add_devices(&pdev->dev, 0, data->subdevs, data->nsubdevs,
157			      res, -1, NULL);
158	if (ret) {
159		dev_err(&pdev->dev, "failed to add subdevices\n");
160		return ret;
161	}
162
163	return 0;
164}
165
166static struct platform_driver sun6i_prcm_driver = {
167	.driver = {
168		.name = "sun6i-prcm",
169		.of_match_table = sun6i_prcm_dt_ids,
170	},
171	.probe = sun6i_prcm_probe,
172};
173builtin_platform_driver(sun6i_prcm_driver);