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
19 static DEFINE_SPINLOCK(sun4i_a10_pll3_lock);
20
sun4i_a10_pll3_setup(struct device_node * node)21 static 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
77 err_clk_unregister:
78 clk_unregister_composite(clk);
79 err_free_mult:
80 kfree(mult);
81 err_free_gate:
82 kfree(gate);
83 err_unmap:
84 iounmap(reg);
85 of_address_to_resource(node, 0, &res);
86 release_mem_region(res.start, resource_size(&res));
87 }
88
89 CLK_OF_DECLARE(sun4i_a10_pll3, "allwinner,sun4i-a10-pll3-clk",
90 sun4i_a10_pll3_setup);
91