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;
58 ctx = kzalloc(sizeof(struct samsung_clk_provider), GFP_KERNEL);
60 panic("could not allocate clock provider context.\n");
62 clk_table = kcalloc(nr_clks, sizeof(struct clk *), GFP_KERNEL);
64 panic("could not allocate clock lookup table\n");
66 for (i = 0; i < nr_clks; ++i)
67 clk_table[i] = ERR_PTR(-ENOENT);
70 ctx->clk_data.clks = clk_table;
71 ctx->clk_data.clk_num = nr_clks;
72 spin_lock_init(&ctx->lock);
77 void __init samsung_clk_of_add_provider(struct device_node *np,
78 struct samsung_clk_provider *ctx)
81 if (of_clk_add_provider(np, of_clk_src_onecell_get,
83 panic("could not register clk provider\n");
87 /* add a clock instance to the clock lookup table used for dt based lookup */
88 void samsung_clk_add_lookup(struct samsung_clk_provider *ctx, struct clk *clk,
91 if (ctx->clk_data.clks && id)
92 ctx->clk_data.clks[id] = clk;
95 /* register a list of aliases */
96 void __init samsung_clk_register_alias(struct samsung_clk_provider *ctx,
97 struct samsung_clock_alias *list,
101 unsigned int idx, ret;
103 if (!ctx->clk_data.clks) {
104 pr_err("%s: clock table missing\n", __func__);
108 for (idx = 0; idx < nr_clk; idx++, list++) {
110 pr_err("%s: clock id missing for index %d\n", __func__,
115 clk = ctx->clk_data.clks[list->id];
117 pr_err("%s: failed to find clock %d\n", __func__,
122 ret = clk_register_clkdev(clk, list->alias, list->dev_name);
124 pr_err("%s: failed to register lookup %s\n",
125 __func__, list->alias);
129 /* register a list of fixed clocks */
130 void __init samsung_clk_register_fixed_rate(struct samsung_clk_provider *ctx,
131 struct samsung_fixed_rate_clock *list, unsigned int nr_clk)
134 unsigned int idx, ret;
136 for (idx = 0; idx < nr_clk; idx++, list++) {
137 clk = clk_register_fixed_rate(NULL, list->name,
138 list->parent_name, list->flags, list->fixed_rate);
140 pr_err("%s: failed to register clock %s\n", __func__,
145 samsung_clk_add_lookup(ctx, clk, list->id);
148 * Unconditionally add a clock lookup for the fixed rate clocks.
149 * There are not many of these on any of Samsung platforms.
151 ret = clk_register_clkdev(clk, list->name, NULL);
153 pr_err("%s: failed to register clock lookup for %s",
154 __func__, list->name);
158 /* register a list of fixed factor clocks */
159 void __init samsung_clk_register_fixed_factor(struct samsung_clk_provider *ctx,
160 struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
165 for (idx = 0; idx < nr_clk; idx++, list++) {
166 clk = clk_register_fixed_factor(NULL, list->name,
167 list->parent_name, list->flags, list->mult, list->div);
169 pr_err("%s: failed to register clock %s\n", __func__,
174 samsung_clk_add_lookup(ctx, clk, list->id);
178 /* register a list of mux clocks */
179 void __init samsung_clk_register_mux(struct samsung_clk_provider *ctx,
180 struct samsung_mux_clock *list,
184 unsigned int idx, ret;
186 for (idx = 0; idx < nr_clk; idx++, list++) {
187 clk = clk_register_mux(NULL, list->name, list->parent_names,
188 list->num_parents, list->flags,
189 ctx->reg_base + list->offset,
190 list->shift, list->width, list->mux_flags, &ctx->lock);
192 pr_err("%s: failed to register clock %s\n", __func__,
197 samsung_clk_add_lookup(ctx, clk, list->id);
199 /* register a clock lookup only if a clock alias is specified */
201 ret = clk_register_clkdev(clk, list->alias,
204 pr_err("%s: failed to register lookup %s\n",
205 __func__, list->alias);
210 /* register a list of div clocks */
211 void __init samsung_clk_register_div(struct samsung_clk_provider *ctx,
212 struct samsung_div_clock *list,
216 unsigned int idx, ret;
218 for (idx = 0; idx < nr_clk; idx++, list++) {
220 clk = clk_register_divider_table(NULL, list->name,
221 list->parent_name, list->flags,
222 ctx->reg_base + list->offset,
223 list->shift, list->width, list->div_flags,
224 list->table, &ctx->lock);
226 clk = clk_register_divider(NULL, list->name,
227 list->parent_name, list->flags,
228 ctx->reg_base + list->offset, list->shift,
229 list->width, list->div_flags, &ctx->lock);
231 pr_err("%s: failed to register clock %s\n", __func__,
236 samsung_clk_add_lookup(ctx, clk, list->id);
238 /* register a clock lookup only if a clock alias is specified */
240 ret = clk_register_clkdev(clk, list->alias,
243 pr_err("%s: failed to register lookup %s\n",
244 __func__, list->alias);
249 /* register a list of gate clocks */
250 void __init samsung_clk_register_gate(struct samsung_clk_provider *ctx,
251 struct samsung_gate_clock *list,
255 unsigned int idx, ret;
257 for (idx = 0; idx < nr_clk; idx++, list++) {
258 clk = clk_register_gate(NULL, list->name, list->parent_name,
259 list->flags, ctx->reg_base + list->offset,
260 list->bit_idx, list->gate_flags, &ctx->lock);
262 pr_err("%s: failed to register clock %s\n", __func__,
267 /* register a clock lookup only if a clock alias is specified */
269 ret = clk_register_clkdev(clk, list->alias,
272 pr_err("%s: failed to register lookup %s\n",
273 __func__, list->alias);
276 samsung_clk_add_lookup(ctx, clk, list->id);
281 * obtain the clock speed of all external fixed clock sources from device
282 * tree and register it
285 void __init samsung_clk_of_register_fixed_ext(struct samsung_clk_provider *ctx,
286 struct samsung_fixed_rate_clock *fixed_rate_clk,
287 unsigned int nr_fixed_rate_clk,
288 const struct of_device_id *clk_matches)
290 const struct of_device_id *match;
291 struct device_node *clk_np;
294 for_each_matching_node_and_match(clk_np, clk_matches, &match) {
295 if (of_property_read_u32(clk_np, "clock-frequency", &freq))
297 fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
299 samsung_clk_register_fixed_rate(ctx, fixed_rate_clk, nr_fixed_rate_clk);
303 /* utility function to get the rate of a specified clock */
304 unsigned long _get_rate(const char *clk_name)
308 clk = __clk_lookup(clk_name);
310 pr_err("%s: could not find clock %s\n", __func__, clk_name);
314 return clk_get_rate(clk);