1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015 Jens Kuske <jenskuske@gmail.com>
4 *
5 * Based on clk-simple-gates.c, which is:
6 * Copyright 2015 Maxime Ripard
7 *
8 * Maxime Ripard <maxime.ripard@free-electrons.com>
9 */
10
11#include <linux/clk-provider.h>
12#include <linux/io.h>
13#include <linux/of.h>
14#include <linux/of_address.h>
15#include <linux/slab.h>
16#include <linux/spinlock.h>
17
18static DEFINE_SPINLOCK(gates_lock);
19
20static void __init sun8i_h3_bus_gates_init(struct device_node *node)
21{
22 static const char * const names[] = { "ahb1", "ahb2", "apb1", "apb2" };
23 enum { AHB1, AHB2, APB1, APB2, PARENT_MAX } clk_parent;
24 const char *parents[PARENT_MAX];
25 struct clk_onecell_data *clk_data;
26 const char *clk_name;
27 struct property *prop;
28 struct resource res;
29 void __iomem *clk_reg;
30 void __iomem *reg;
31 const __be32 *p;
32 int number, i;
33 u8 clk_bit;
34 int index;
35
36 reg = of_io_request_and_map(device: node, index: 0, name: of_node_full_name(np: node));
37 if (IS_ERR(ptr: reg))
38 return;
39
40 for (i = 0; i < ARRAY_SIZE(names); i++) {
41 int idx = of_property_match_string(np: node, propname: "clock-names",
42 string: names[i]);
43 if (idx < 0)
44 return;
45
46 parents[i] = of_clk_get_parent_name(np: node, index: idx);
47 }
48
49 clk_data = kmalloc(size: sizeof(struct clk_onecell_data), GFP_KERNEL);
50 if (!clk_data)
51 goto err_unmap;
52
53 number = of_property_count_u32_elems(np: node, propname: "clock-indices");
54 of_property_read_u32_index(np: node, propname: "clock-indices", index: number - 1, out_value: &number);
55
56 clk_data->clks = kcalloc(n: number + 1, size: sizeof(struct clk *), GFP_KERNEL);
57 if (!clk_data->clks)
58 goto err_free_data;
59
60 i = 0;
61 of_property_for_each_u32(node, "clock-indices", prop, p, index) {
62 of_property_read_string_index(np: node, propname: "clock-output-names",
63 index: i, output: &clk_name);
64
65 if (index == 17 || (index >= 29 && index <= 31))
66 clk_parent = AHB2;
67 else if (index <= 63 || index >= 128)
68 clk_parent = AHB1;
69 else if (index >= 64 && index <= 95)
70 clk_parent = APB1;
71 else if (index >= 96 && index <= 127)
72 clk_parent = APB2;
73 else {
74 WARN_ON(true);
75 continue;
76 }
77
78 clk_reg = reg + 4 * (index / 32);
79 clk_bit = index % 32;
80
81 clk_data->clks[index] = clk_register_gate(NULL, name: clk_name,
82 parent_name: parents[clk_parent],
83 flags: 0, reg: clk_reg, bit_idx: clk_bit,
84 clk_gate_flags: 0, lock: &gates_lock);
85 i++;
86
87 if (IS_ERR(ptr: clk_data->clks[index])) {
88 WARN_ON(true);
89 continue;
90 }
91 }
92
93 clk_data->clk_num = number + 1;
94 of_clk_add_provider(np: node, clk_src_get: of_clk_src_onecell_get, data: clk_data);
95
96 return;
97
98err_free_data:
99 kfree(objp: clk_data);
100err_unmap:
101 iounmap(addr: reg);
102 of_address_to_resource(dev: node, index: 0, r: &res);
103 release_mem_region(res.start, resource_size(&res));
104}
105
106CLK_OF_DECLARE(sun8i_h3_bus_gates, "allwinner,sun8i-h3-bus-gates-clk",
107 sun8i_h3_bus_gates_init);
108CLK_OF_DECLARE(sun8i_a83t_bus_gates, "allwinner,sun8i-a83t-bus-gates-clk",
109 sun8i_h3_bus_gates_init);
110

source code of linux/drivers/clk/sunxi/clk-sun8i-bus-gates.c