2 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
3 * Copyright (c) 2013 Linaro Ltd.
4 * Author: Thomas Abraham <thomas.ab@samsung.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 as
8 * published by the Free Software Foundation.
10 * This file includes utility functions to register clocks to common
11 * clock framework for Samsung platforms.
14 #include <linux/syscore_ops.h>
17 void samsung_clk_save(void __iomem *base,
18 struct samsung_clk_reg_dump *rd,
19 unsigned int num_regs)
21 for (; num_regs > 0; --num_regs, ++rd)
22 rd->value = readl(base + rd->offset);
25 void samsung_clk_restore(void __iomem *base,
26 const struct samsung_clk_reg_dump *rd,
27 unsigned int num_regs)
29 for (; num_regs > 0; --num_regs, ++rd)
30 writel(rd->value, base + rd->offset);
33 struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
34 const unsigned long *rdump,
35 unsigned long nr_rdump)
37 struct samsung_clk_reg_dump *rd;
40 rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
44 for (i = 0; i < nr_rdump; ++i)
45 rd[i].offset = rdump[i];
50 /* setup the essentials required to support clock lookup using ccf */
51 struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np,
52 void __iomem *base, unsigned long nr_clks)
54 struct samsung_clk_provider *ctx;
55 struct clk **clk_table;
59 ctx = kzalloc(sizeof(struct samsung_clk_provider), GFP_KERNEL);
61 panic("could not allocate clock provider context.\n");
63 clk_table = kcalloc(nr_clks, sizeof(struct clk *), GFP_KERNEL);
65 panic("could not allocate clock lookup table\n");
67 for (i = 0; i < nr_clks; ++i)
68 clk_table[i] = ERR_PTR(-ENOENT);
71 ctx->clk_data.clks = clk_table;
72 ctx->clk_data.clk_num = nr_clks;
73 spin_lock_init(&ctx->lock);
78 ret = of_clk_add_provider(np, of_clk_src_onecell_get,
81 panic("could not register clock provide\n");
86 /* add a clock instance to the clock lookup table used for dt based lookup */
87 void samsung_clk_add_lookup(struct samsung_clk_provider *ctx, struct clk *clk,
90 if (ctx->clk_data.clks && id)
91 ctx->clk_data.clks[id] = clk;
94 /* register a list of aliases */
95 void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
96 struct samsung_clock_alias *list,
100 unsigned int idx, ret;
102 if (!ctx->clk_data.clks) {
103 pr_err("%s: clock table missing\n", __func__);
107 for (idx = 0; idx < nr_clk; idx++, list++) {
109 pr_err("%s: clock id missing for index %d\n", __func__,
114 clk = ctx->clk_data.clks[list->id];
116 pr_err("%s: failed to find clock %d\n", __func__,
121 ret = clk_register_clkdev(clk, list->alias, list->dev_name);
123 pr_err("%s: failed to register lookup %s\n",
124 __func__, list->alias);
128 /* register a list of fixed clocks */
129 void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx,
130 struct samsung_fixed_rate_clock *list, unsigned int nr_clk)
133 unsigned int idx, ret;
135 for (idx = 0; idx < nr_clk; idx++, list++) {
136 clk = clk_register_fixed_rate(NULL, list->name,
137 list->parent_name, list->flags, list->fixed_rate);
139 pr_err("%s: failed to register clock %s\n", __func__,
144 samsung_clk_add_lookup(ctx, clk, list->id);
147 * Unconditionally add a clock lookup for the fixed rate clocks.
148 * There are not many of these on any of Samsung platforms.
150 ret = clk_register_clkdev(clk, list->name, NULL);
152 pr_err("%s: failed to register clock lookup for %s",
153 __func__, list->name);
157 /* register a list of fixed factor clocks */
158 void __init samsung_clk_register_fixed_factor(struct samsung_clk_provider *ctx,
159 struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
164 for (idx = 0; idx < nr_clk; idx++, list++) {
165 clk = clk_register_fixed_factor(NULL, list->name,
166 list->parent_name, list->flags, list->mult, list->div);
168 pr_err("%s: failed to register clock %s\n", __func__,
173 samsung_clk_add_lookup(ctx, clk, list->id);
177 /* register a list of mux clocks */
178 void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
179 struct samsung_mux_clock *list,
183 unsigned int idx, ret;
185 for (idx = 0; idx < nr_clk; idx++, list++) {
186 clk = clk_register_mux(NULL, list->name, list->parent_names,
187 list->num_parents, list->flags,
188 ctx->reg_base + list->offset,
189 list->shift, list->width, list->mux_flags, &ctx->lock);
191 pr_err("%s: failed to register clock %s\n", __func__,
196 samsung_clk_add_lookup(ctx, clk, list->id);
198 /* register a clock lookup only if a clock alias is specified */
200 ret = clk_register_clkdev(clk, list->alias,
203 pr_err("%s: failed to register lookup %s\n",
204 __func__, list->alias);
209 /* register a list of div clocks */
210 void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
211 struct samsung_div_clock *list,
215 unsigned int idx, ret;
217 for (idx = 0; idx < nr_clk; idx++, list++) {
219 clk = clk_register_divider_table(NULL, list->name,
220 list->parent_name, list->flags,
221 ctx->reg_base + list->offset,
222 list->shift, list->width, list->div_flags,
223 list->table, &ctx->lock);
225 clk = clk_register_divider(NULL, list->name,
226 list->parent_name, list->flags,
227 ctx->reg_base + list->offset, list->shift,
228 list->width, list->div_flags, &ctx->lock);
230 pr_err("%s: failed to register clock %s\n", __func__,
235 samsung_clk_add_lookup(ctx, clk, list->id);
237 /* register a clock lookup only if a clock alias is specified */
239 ret = clk_register_clkdev(clk, list->alias,
242 pr_err("%s: failed to register lookup %s\n",
243 __func__, list->alias);
248 /* register a list of gate clocks */
249 void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
250 struct samsung_gate_clock *list,
254 unsigned int idx, ret;
256 for (idx = 0; idx < nr_clk; idx++, list++) {
257 clk = clk_register_gate(NULL, list->name, list->parent_name,
258 list->flags, ctx->reg_base + list->offset,
259 list->bit_idx, list->gate_flags, &ctx->lock);
261 pr_err("%s: failed to register clock %s\n", __func__,
266 /* register a clock lookup only if a clock alias is specified */
268 ret = clk_register_clkdev(clk, list->alias,
271 pr_err("%s: failed to register lookup %s\n",
272 __func__, list->alias);
275 samsung_clk_add_lookup(ctx, clk, list->id);
280 * obtain the clock speed of all external fixed clock sources from device
281 * tree and register it
284 void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
285 struct samsung_fixed_rate_clock *fixed_rate_clk,
286 unsigned int nr_fixed_rate_clk,
287 struct of_device_id *clk_matches)
289 const struct of_device_id *match;
290 struct device_node *clk_np;
293 for_each_matching_node_and_match(clk_np, clk_matches, &match) {
294 if (of_property_read_u32(clk_np, "clock-frequency", &freq))
296 fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
298 samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
302 /* utility function to get the rate of a specified clock */
303 unsigned long _get_rate(const char *clk_name)
307 clk = __clk_lookup(clk_name);
309 pr_err("%s: could not find clock %s\n", __func__, clk_name);
313 return clk_get_rate(clk);