1/*
 2 * Copyright 2013 Emilio López
 3 *
 4 * Emilio López <emilio@elopez.com.ar>
 5 *
 6 * This program is free software; you can redistribute it and/or modify
 7 * it under the terms of the GNU General Public License as published by
 8 * the Free Software Foundation; either version 2 of the License, or
 9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 */
16
17#include <linux/clk-provider.h>
18#include <linux/of.h>
19#include <linux/of_address.h>
20#include <linux/slab.h>
21
22static DEFINE_SPINLOCK(mod1_lock);
23
24#define SUN4I_MOD1_ENABLE	31
25#define SUN4I_MOD1_MUX		16
26#define SUN4I_MOD1_MUX_WIDTH	2
27#define SUN4I_MOD1_MAX_PARENTS	4
28
29static void __init sun4i_mod1_clk_setup(struct device_node *node)
30{
31	struct clk *clk;
32	struct clk_mux *mux;
33	struct clk_gate *gate;
34	const char *parents[4];
35	const char *clk_name = node->name;
36	void __iomem *reg;
37	int i;
38
39	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
40	if (IS_ERR(reg))
41		return;
42
43	mux = kzalloc(sizeof(*mux), GFP_KERNEL);
44	if (!mux)
45		goto err_unmap;
46
47	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
48	if (!gate)
49		goto err_free_mux;
50
51	of_property_read_string(node, "clock-output-names", &clk_name);
52	i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
53
54	gate->reg = reg;
55	gate->bit_idx = SUN4I_MOD1_ENABLE;
56	gate->lock = &mod1_lock;
57	mux->reg = reg;
58	mux->shift = SUN4I_MOD1_MUX;
59	mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
60	mux->lock = &mod1_lock;
61
62	clk = clk_register_composite(NULL, clk_name, parents, i,
63				     &mux->hw, &clk_mux_ops,
64				     NULL, NULL,
65				     &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT);
66	if (IS_ERR(clk))
67		goto err_free_gate;
68
69	of_clk_add_provider(node, of_clk_src_simple_get, clk);
70
71	return;
72
73err_free_gate:
74	kfree(gate);
75err_free_mux:
76	kfree(mux);
77err_unmap:
78	iounmap(reg);
79}
80CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
81	       sun4i_mod1_clk_setup);