1// SPDX-License-Identifier: GPL-2.0-or-later
 2/*
 3 * Copyright 2015 Maxime Ripard
 4 *
 5 * Maxime Ripard <maxime.ripard@free-electrons.com>
 6 */
 7
 8#include <linux/clk-provider.h>
 9#include <linux/io.h>
10#include <linux/of.h>
11#include <linux/of_address.h>
12#include <linux/slab.h>
13#include <linux/spinlock.h>
14
15#define SUN4I_A10_PLL3_GATE_BIT	31
16#define SUN4I_A10_PLL3_DIV_WIDTH	7
17#define SUN4I_A10_PLL3_DIV_SHIFT	0
18
19static DEFINE_SPINLOCK(sun4i_a10_pll3_lock);
20
21static void __init sun4i_a10_pll3_setup(struct device_node *node)
22{
23	const char *clk_name = node->name, *parent;
24	struct clk_multiplier *mult;
25	struct clk_gate *gate;
26	struct resource res;
27	void __iomem *reg;
28	struct clk *clk;
29	int ret;
30
31	of_property_read_string(node, "clock-output-names", &clk_name);
32	parent = of_clk_get_parent_name(node, 0);
33
34	reg = of_io_request_and_map(node, 0, of_node_full_name(node));
35	if (IS_ERR(reg)) {
36		pr_err("%s: Could not map the clock registers\n", clk_name);
37		return;
38	}
39
40	gate = kzalloc(sizeof(*gate), GFP_KERNEL);
41	if (!gate)
42		goto err_unmap;
43
44	gate->reg = reg;
45	gate->bit_idx = SUN4I_A10_PLL3_GATE_BIT;
46	gate->lock = &sun4i_a10_pll3_lock;
47
48	mult = kzalloc(sizeof(*mult), GFP_KERNEL);
49	if (!mult)
50		goto err_free_gate;
51
52	mult->reg = reg;
53	mult->shift = SUN4I_A10_PLL3_DIV_SHIFT;
54	mult->width = SUN4I_A10_PLL3_DIV_WIDTH;
55	mult->lock = &sun4i_a10_pll3_lock;
56
57	clk = clk_register_composite(NULL, clk_name,
58				     &parent, 1,
59				     NULL, NULL,
60				     &mult->hw, &clk_multiplier_ops,
61				     &gate->hw, &clk_gate_ops,
62				     0);
63	if (IS_ERR(clk)) {
64		pr_err("%s: Couldn't register the clock\n", clk_name);
65		goto err_free_mult;
66	}
67
68	ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
69	if (ret) {
70		pr_err("%s: Couldn't register DT provider\n",
71		       clk_name);
72		goto err_clk_unregister;
73	}
74
75	return;
76
77err_clk_unregister:
78	clk_unregister_composite(clk);
79err_free_mult:
80	kfree(mult);
81err_free_gate:
82	kfree(gate);
83err_unmap:
84	iounmap(reg);
85	of_address_to_resource(node, 0, &res);
86	release_mem_region(res.start, resource_size(&res));
87}
88
89CLK_OF_DECLARE(sun4i_a10_pll3, "allwinner,sun4i-a10-pll3-clk",
90	       sun4i_a10_pll3_setup);