2 * Marvell EBU SoC common clock handling
4 * Copyright (C) 2012 Marvell
6 * Gregory CLEMENT <gregory.clement@free-electrons.com>
7 * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
8 * Andrew Lunn <andrew@lunn.ch>
10 * This file is licensed under the terms of the GNU General Public
11 * License version 2. This program is licensed "as is" without any
12 * warranty of any kind, whether express or implied.
15 #include <linux/kernel.h>
16 #include <linux/clk.h>
17 #include <linux/clkdev.h>
18 #include <linux/clk-provider.h>
21 #include <linux/of_address.h>
29 static struct clk_onecell_data clk_data;
31 void __init mvebu_coreclk_setup(struct device_node *np,
32 const struct coreclk_soc_desc *desc)
34 const char *tclk_name = "tclk";
35 const char *cpuclk_name = "cpuclk";
40 base = of_iomap(np, 0);
44 /* Allocate struct for TCLK, cpu clk, and core ratio clocks */
45 clk_data.clk_num = 2 + desc->num_ratios;
46 clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *),
48 if (WARN_ON(!clk_data.clks)) {
54 of_property_read_string_index(np, "clock-output-names", 0,
56 rate = desc->get_tclk_freq(base);
57 clk_data.clks[0] = clk_register_fixed_rate(NULL, tclk_name, NULL,
59 WARN_ON(IS_ERR(clk_data.clks[0]));
61 /* Register CPU clock */
62 of_property_read_string_index(np, "clock-output-names", 1,
64 rate = desc->get_cpu_freq(base);
65 clk_data.clks[1] = clk_register_fixed_rate(NULL, cpuclk_name, NULL,
67 WARN_ON(IS_ERR(clk_data.clks[1]));
69 /* Register fixed-factor clocks derived from CPU clock */
70 for (n = 0; n < desc->num_ratios; n++) {
71 const char *rclk_name = desc->ratios[n].name;
74 of_property_read_string_index(np, "clock-output-names",
76 desc->get_clk_ratio(base, desc->ratios[n].id, &mult, &div);
77 clk_data.clks[2+n] = clk_register_fixed_factor(NULL, rclk_name,
78 cpuclk_name, 0, mult, div);
79 WARN_ON(IS_ERR(clk_data.clks[2+n]));
82 /* SAR register isn't needed anymore */
85 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
89 * Clock Gating Control
92 DEFINE_SPINLOCK(ctrl_gating_lock);
94 struct clk_gating_ctrl {
100 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
102 static struct clk *clk_gating_get_src(
103 struct of_phandle_args *clkspec, void *data)
105 struct clk_gating_ctrl *ctrl = (struct clk_gating_ctrl *)data;
108 if (clkspec->args_count < 1)
109 return ERR_PTR(-EINVAL);
111 for (n = 0; n < ctrl->num_gates; n++) {
112 struct clk_gate *gate =
113 to_clk_gate(__clk_get_hw(ctrl->gates[n]));
114 if (clkspec->args[0] == gate->bit_idx)
115 return ctrl->gates[n];
117 return ERR_PTR(-ENODEV);
120 void __init mvebu_clk_gating_setup(struct device_node *np,
121 const struct clk_gating_soc_desc *desc)
123 struct clk_gating_ctrl *ctrl;
126 const char *default_parent = NULL;
129 base = of_iomap(np, 0);
133 clk = of_clk_get(np, 0);
135 default_parent = __clk_get_name(clk);
139 ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
143 /* lock must already be initialized */
144 ctrl->lock = &ctrl_gating_lock;
146 /* Count, allocate, and register clock gates */
147 for (n = 0; desc[n].name;)
151 ctrl->gates = kzalloc(ctrl->num_gates * sizeof(struct clk *),
153 if (WARN_ON(!ctrl->gates))
156 for (n = 0; n < ctrl->num_gates; n++) {
158 (desc[n].parent) ? desc[n].parent : default_parent;
159 ctrl->gates[n] = clk_register_gate(NULL, desc[n].name, parent,
160 desc[n].flags, base, desc[n].bit_idx,
162 WARN_ON(IS_ERR(ctrl->gates[n]));
165 of_clk_add_provider(np, clk_gating_get_src, ctrl);