2 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
4 * This software is licensed under the terms of the GNU General Public
5 * License version 2, as published by the Free Software Foundation, and
6 * may be copied, distributed, and modified under those terms.
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
14 #include <linux/export.h>
15 #include <linux/module.h>
16 #include <linux/regmap.h>
17 #include <linux/platform_device.h>
18 #include <linux/clk-provider.h>
19 #include <linux/reset-controller.h>
24 #include "clk-regmap.h"
29 struct qcom_reset_controller reset;
30 struct clk_regmap **rclks;
35 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
47 /* Default to our fastest rate */
50 EXPORT_SYMBOL_GPL(qcom_find_freq);
52 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
55 const struct freq_tbl *best = NULL;
57 for ( ; f->freq; f++) {
66 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
68 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
70 int i, num_parents = clk_hw_get_num_parents(hw);
72 for (i = 0; i < num_parents; i++)
73 if (src == map[i].src)
78 EXPORT_SYMBOL_GPL(qcom_find_src_index);
81 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
85 struct device *dev = &pdev->dev;
87 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
88 base = devm_ioremap_resource(dev, res);
90 return ERR_CAST(base);
92 return devm_regmap_init_mmio(dev, base, desc->config);
94 EXPORT_SYMBOL_GPL(qcom_cc_map);
97 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
102 /* De-assert reset to FSM */
103 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
105 /* Program bias count and lock count */
106 val = bias_count << PLL_BIAS_COUNT_SHIFT |
107 lock_count << PLL_LOCK_COUNT_SHIFT;
108 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
109 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
110 regmap_update_bits(map, reg, mask, val);
112 /* Enable PLL FSM voting */
113 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
115 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
117 static void qcom_cc_del_clk_provider(void *data)
119 of_clk_del_provider(data);
122 static void qcom_cc_reset_unregister(void *data)
124 reset_controller_unregister(data);
127 static void qcom_cc_gdsc_unregister(void *data)
129 gdsc_unregister(data);
133 * Backwards compatibility with old DTs. Register a pass-through factor 1/1
134 * clock to translate 'path' clk into 'name' clk and register the 'path'
135 * clk as a fixed rate clock if it isn't present.
137 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
138 const char *name, unsigned long rate,
141 struct device_node *node = NULL;
142 struct device_node *clocks_node;
143 struct clk_fixed_factor *factor;
144 struct clk_fixed_rate *fixed;
145 struct clk_init_data init_data = { };
148 clocks_node = of_find_node_by_path("/clocks");
150 node = of_get_child_by_name(clocks_node, path);
151 of_node_put(clocks_node);
155 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
159 fixed->fixed_rate = rate;
160 fixed->hw.init = &init_data;
162 init_data.name = path;
163 init_data.ops = &clk_fixed_rate_ops;
165 ret = devm_clk_hw_register(dev, &fixed->hw);
172 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
176 factor->mult = factor->div = 1;
177 factor->hw.init = &init_data;
179 init_data.name = name;
180 init_data.parent_names = &path;
181 init_data.num_parents = 1;
183 init_data.ops = &clk_fixed_factor_ops;
185 ret = devm_clk_hw_register(dev, &factor->hw);
193 int qcom_cc_register_board_clk(struct device *dev, const char *path,
194 const char *name, unsigned long rate)
196 bool add_factor = true;
199 * TODO: The RPM clock driver currently does not support the xo clock.
200 * When xo is added to the RPM clock driver, we should change this
201 * function to skip registration of xo factor clocks.
204 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
206 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
208 int qcom_cc_register_sleep_clk(struct device *dev)
210 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
213 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
215 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
218 struct qcom_cc *cc = data;
219 unsigned int idx = clkspec->args[0];
221 if (idx >= cc->num_rclks) {
222 pr_err("%s: invalid index %u\n", __func__, idx);
223 return ERR_PTR(-EINVAL);
226 return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
229 int qcom_cc_really_probe(struct platform_device *pdev,
230 const struct qcom_cc_desc *desc, struct regmap *regmap)
233 struct device *dev = &pdev->dev;
234 struct qcom_reset_controller *reset;
236 struct gdsc_desc *scd;
237 size_t num_clks = desc->num_clks;
238 struct clk_regmap **rclks = desc->clks;
240 cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
245 cc->num_rclks = num_clks;
247 for (i = 0; i < num_clks; i++) {
251 ret = devm_clk_register_regmap(dev, rclks[i]);
256 ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc);
260 ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider,
267 reset->rcdev.of_node = dev->of_node;
268 reset->rcdev.ops = &qcom_reset_ops;
269 reset->rcdev.owner = dev->driver->owner;
270 reset->rcdev.nr_resets = desc->num_resets;
271 reset->regmap = regmap;
272 reset->reset_map = desc->resets;
274 ret = reset_controller_register(&reset->rcdev);
278 ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister,
284 if (desc->gdscs && desc->num_gdscs) {
285 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
289 scd->scs = desc->gdscs;
290 scd->num = desc->num_gdscs;
291 ret = gdsc_register(scd, &reset->rcdev, regmap);
294 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
302 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
304 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
306 struct regmap *regmap;
308 regmap = qcom_cc_map(pdev, desc);
310 return PTR_ERR(regmap);
312 return qcom_cc_really_probe(pdev, desc, regmap);
314 EXPORT_SYMBOL_GPL(qcom_cc_probe);
316 MODULE_LICENSE("GPL v2");