2 * PRCC clock implementation for ux500 platform.
4 * Copyright (C) 2012 ST-Ericsson SA
5 * Author: Ulf Hansson <ulf.hansson@linaro.org>
7 * License terms: GNU General Public License (GPL) version 2
10 #include <linux/clk-provider.h>
11 #include <linux/slab.h>
13 #include <linux/err.h>
14 #include <linux/types.h>
18 #define PRCC_PCKEN 0x000
19 #define PRCC_PCKDIS 0x004
20 #define PRCC_KCKEN 0x008
21 #define PRCC_KCKDIS 0x00C
22 #define PRCC_PCKSR 0x010
23 #define PRCC_KCKSR 0x014
25 #define to_clk_prcc(_hw) container_of(_hw, struct clk_prcc, hw)
34 /* PRCC clock operations. */
36 static int clk_prcc_pclk_enable(struct clk_hw *hw)
38 struct clk_prcc *clk = to_clk_prcc(hw);
40 writel(clk->cg_sel, (clk->base + PRCC_PCKEN));
41 while (!(readl(clk->base + PRCC_PCKSR) & clk->cg_sel))
48 static void clk_prcc_pclk_disable(struct clk_hw *hw)
50 struct clk_prcc *clk = to_clk_prcc(hw);
52 writel(clk->cg_sel, (clk->base + PRCC_PCKDIS));
56 static int clk_prcc_kclk_enable(struct clk_hw *hw)
58 struct clk_prcc *clk = to_clk_prcc(hw);
60 writel(clk->cg_sel, (clk->base + PRCC_KCKEN));
61 while (!(readl(clk->base + PRCC_KCKSR) & clk->cg_sel))
68 static void clk_prcc_kclk_disable(struct clk_hw *hw)
70 struct clk_prcc *clk = to_clk_prcc(hw);
72 writel(clk->cg_sel, (clk->base + PRCC_KCKDIS));
76 static int clk_prcc_is_enabled(struct clk_hw *hw)
78 struct clk_prcc *clk = to_clk_prcc(hw);
79 return clk->is_enabled;
82 static struct clk_ops clk_prcc_pclk_ops = {
83 .enable = clk_prcc_pclk_enable,
84 .disable = clk_prcc_pclk_disable,
85 .is_enabled = clk_prcc_is_enabled,
88 static struct clk_ops clk_prcc_kclk_ops = {
89 .enable = clk_prcc_kclk_enable,
90 .disable = clk_prcc_kclk_disable,
91 .is_enabled = clk_prcc_is_enabled,
94 static struct clk *clk_reg_prcc(const char *name,
95 const char *parent_name,
96 resource_size_t phy_base,
99 struct clk_ops *clk_prcc_ops)
101 struct clk_prcc *clk;
102 struct clk_init_data clk_prcc_init;
106 pr_err("clk_prcc: %s invalid arguments passed\n", __func__);
107 return ERR_PTR(-EINVAL);
110 clk = kzalloc(sizeof(struct clk_prcc), GFP_KERNEL);
112 pr_err("clk_prcc: %s could not allocate clk\n", __func__);
113 return ERR_PTR(-ENOMEM);
116 clk->base = ioremap(phy_base, SZ_4K);
120 clk->cg_sel = cg_sel;
123 clk_prcc_init.name = name;
124 clk_prcc_init.ops = clk_prcc_ops;
125 clk_prcc_init.flags = flags;
126 clk_prcc_init.parent_names = (parent_name ? &parent_name : NULL);
127 clk_prcc_init.num_parents = (parent_name ? 1 : 0);
128 clk->hw.init = &clk_prcc_init;
130 clk_reg = clk_register(NULL, &clk->hw);
131 if (IS_ERR_OR_NULL(clk_reg))
140 pr_err("clk_prcc: %s failed to register clk\n", __func__);
141 return ERR_PTR(-ENOMEM);
144 struct clk *clk_reg_prcc_pclk(const char *name,
145 const char *parent_name,
146 resource_size_t phy_base,
150 return clk_reg_prcc(name, parent_name, phy_base, cg_sel, flags,
154 struct clk *clk_reg_prcc_kclk(const char *name,
155 const char *parent_name,
156 resource_size_t phy_base,
160 return clk_reg_prcc(name, parent_name, phy_base, cg_sel, flags,