1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2014 Chen-Yu Tsai
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Chen-Yu Tsai <wens@csie.org>
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/clk.h>
9*4882a593Smuzhiyun #include <linux/clk-provider.h>
10*4882a593Smuzhiyun #include <linux/io.h>
11*4882a593Smuzhiyun #include <linux/slab.h>
12*4882a593Smuzhiyun #include <linux/spinlock.h>
13*4882a593Smuzhiyun #include <linux/of_address.h>
14*4882a593Smuzhiyun
15*4882a593Smuzhiyun #define SUN8I_MBUS_ENABLE 31
16*4882a593Smuzhiyun #define SUN8I_MBUS_MUX_SHIFT 24
17*4882a593Smuzhiyun #define SUN8I_MBUS_MUX_MASK 0x3
18*4882a593Smuzhiyun #define SUN8I_MBUS_DIV_SHIFT 0
19*4882a593Smuzhiyun #define SUN8I_MBUS_DIV_WIDTH 3
20*4882a593Smuzhiyun #define SUN8I_MBUS_MAX_PARENTS 4
21*4882a593Smuzhiyun
22*4882a593Smuzhiyun static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);
23*4882a593Smuzhiyun
sun8i_a23_mbus_setup(struct device_node * node)24*4882a593Smuzhiyun static void __init sun8i_a23_mbus_setup(struct device_node *node)
25*4882a593Smuzhiyun {
26*4882a593Smuzhiyun int num_parents = of_clk_get_parent_count(node);
27*4882a593Smuzhiyun const char **parents;
28*4882a593Smuzhiyun const char *clk_name = node->name;
29*4882a593Smuzhiyun struct resource res;
30*4882a593Smuzhiyun struct clk_divider *div;
31*4882a593Smuzhiyun struct clk_gate *gate;
32*4882a593Smuzhiyun struct clk_mux *mux;
33*4882a593Smuzhiyun struct clk *clk;
34*4882a593Smuzhiyun void __iomem *reg;
35*4882a593Smuzhiyun int err;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun parents = kcalloc(num_parents, sizeof(*parents), GFP_KERNEL);
38*4882a593Smuzhiyun if (!parents)
39*4882a593Smuzhiyun return;
40*4882a593Smuzhiyun
41*4882a593Smuzhiyun reg = of_io_request_and_map(node, 0, of_node_full_name(node));
42*4882a593Smuzhiyun if (IS_ERR(reg)) {
43*4882a593Smuzhiyun pr_err("Could not get registers for sun8i-mbus-clk\n");
44*4882a593Smuzhiyun goto err_free_parents;
45*4882a593Smuzhiyun }
46*4882a593Smuzhiyun
47*4882a593Smuzhiyun div = kzalloc(sizeof(*div), GFP_KERNEL);
48*4882a593Smuzhiyun if (!div)
49*4882a593Smuzhiyun goto err_unmap;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun mux = kzalloc(sizeof(*mux), GFP_KERNEL);
52*4882a593Smuzhiyun if (!mux)
53*4882a593Smuzhiyun goto err_free_div;
54*4882a593Smuzhiyun
55*4882a593Smuzhiyun gate = kzalloc(sizeof(*gate), GFP_KERNEL);
56*4882a593Smuzhiyun if (!gate)
57*4882a593Smuzhiyun goto err_free_mux;
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun of_property_read_string(node, "clock-output-names", &clk_name);
60*4882a593Smuzhiyun of_clk_parent_fill(node, parents, num_parents);
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun gate->reg = reg;
63*4882a593Smuzhiyun gate->bit_idx = SUN8I_MBUS_ENABLE;
64*4882a593Smuzhiyun gate->lock = &sun8i_a23_mbus_lock;
65*4882a593Smuzhiyun
66*4882a593Smuzhiyun div->reg = reg;
67*4882a593Smuzhiyun div->shift = SUN8I_MBUS_DIV_SHIFT;
68*4882a593Smuzhiyun div->width = SUN8I_MBUS_DIV_WIDTH;
69*4882a593Smuzhiyun div->lock = &sun8i_a23_mbus_lock;
70*4882a593Smuzhiyun
71*4882a593Smuzhiyun mux->reg = reg;
72*4882a593Smuzhiyun mux->shift = SUN8I_MBUS_MUX_SHIFT;
73*4882a593Smuzhiyun mux->mask = SUN8I_MBUS_MUX_MASK;
74*4882a593Smuzhiyun mux->lock = &sun8i_a23_mbus_lock;
75*4882a593Smuzhiyun
76*4882a593Smuzhiyun /* The MBUS clocks needs to be always enabled */
77*4882a593Smuzhiyun clk = clk_register_composite(NULL, clk_name, parents, num_parents,
78*4882a593Smuzhiyun &mux->hw, &clk_mux_ops,
79*4882a593Smuzhiyun &div->hw, &clk_divider_ops,
80*4882a593Smuzhiyun &gate->hw, &clk_gate_ops,
81*4882a593Smuzhiyun CLK_IS_CRITICAL);
82*4882a593Smuzhiyun if (IS_ERR(clk))
83*4882a593Smuzhiyun goto err_free_gate;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun err = of_clk_add_provider(node, of_clk_src_simple_get, clk);
86*4882a593Smuzhiyun if (err)
87*4882a593Smuzhiyun goto err_unregister_clk;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun kfree(parents); /* parents is deep copied */
90*4882a593Smuzhiyun
91*4882a593Smuzhiyun return;
92*4882a593Smuzhiyun
93*4882a593Smuzhiyun err_unregister_clk:
94*4882a593Smuzhiyun /* TODO: The composite clock stuff will leak a bit here. */
95*4882a593Smuzhiyun clk_unregister(clk);
96*4882a593Smuzhiyun err_free_gate:
97*4882a593Smuzhiyun kfree(gate);
98*4882a593Smuzhiyun err_free_mux:
99*4882a593Smuzhiyun kfree(mux);
100*4882a593Smuzhiyun err_free_div:
101*4882a593Smuzhiyun kfree(div);
102*4882a593Smuzhiyun err_unmap:
103*4882a593Smuzhiyun iounmap(reg);
104*4882a593Smuzhiyun of_address_to_resource(node, 0, &res);
105*4882a593Smuzhiyun release_mem_region(res.start, resource_size(&res));
106*4882a593Smuzhiyun err_free_parents:
107*4882a593Smuzhiyun kfree(parents);
108*4882a593Smuzhiyun }
109*4882a593Smuzhiyun CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);
110