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)
44 /* Default to our fastest rate */
47 EXPORT_SYMBOL_GPL(qcom_find_freq);
49 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
51 int i, num_parents = clk_hw_get_num_parents(hw);
53 for (i = 0; i < num_parents; i++)
54 if (src == map[i].src)
59 EXPORT_SYMBOL_GPL(qcom_find_src_index);
62 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
66 struct device *dev = &pdev->dev;
68 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
69 base = devm_ioremap_resource(dev, res);
71 return ERR_CAST(base);
73 return devm_regmap_init_mmio(dev, base, desc->config);
75 EXPORT_SYMBOL_GPL(qcom_cc_map);
78 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
83 /* De-assert reset to FSM */
84 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
86 /* Program bias count and lock count */
87 val = bias_count << PLL_BIAS_COUNT_SHIFT |
88 lock_count << PLL_LOCK_COUNT_SHIFT;
89 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
90 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
91 regmap_update_bits(map, reg, mask, val);
93 /* Enable PLL FSM voting */
94 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
96 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
98 static void qcom_cc_del_clk_provider(void *data)
100 of_clk_del_provider(data);
103 static void qcom_cc_reset_unregister(void *data)
105 reset_controller_unregister(data);
108 static void qcom_cc_gdsc_unregister(void *data)
110 gdsc_unregister(data);
114 * Backwards compatibility with old DTs. Register a pass-through factor 1/1
115 * clock to translate 'path' clk into 'name' clk and regsiter the 'path'
116 * clk as a fixed rate clock if it isn't present.
118 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
119 const char *name, unsigned long rate,
122 struct device_node *node = NULL;
123 struct device_node *clocks_node;
124 struct clk_fixed_factor *factor;
125 struct clk_fixed_rate *fixed;
126 struct clk_init_data init_data = { };
129 clocks_node = of_find_node_by_path("/clocks");
131 node = of_find_node_by_name(clocks_node, path);
132 of_node_put(clocks_node);
135 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
139 fixed->fixed_rate = rate;
140 fixed->hw.init = &init_data;
142 init_data.name = path;
143 init_data.ops = &clk_fixed_rate_ops;
145 ret = devm_clk_hw_register(dev, &fixed->hw);
152 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
156 factor->mult = factor->div = 1;
157 factor->hw.init = &init_data;
159 init_data.name = name;
160 init_data.parent_names = &path;
161 init_data.num_parents = 1;
163 init_data.ops = &clk_fixed_factor_ops;
165 ret = devm_clk_hw_register(dev, &factor->hw);
173 int qcom_cc_register_board_clk(struct device *dev, const char *path,
174 const char *name, unsigned long rate)
176 bool add_factor = true;
179 * TODO: The RPM clock driver currently does not support the xo clock.
180 * When xo is added to the RPM clock driver, we should change this
181 * function to skip registration of xo factor clocks.
184 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
186 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
188 int qcom_cc_register_sleep_clk(struct device *dev)
190 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
193 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
195 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
198 struct qcom_cc *cc = data;
199 unsigned int idx = clkspec->args[0];
201 if (idx >= cc->num_rclks) {
202 pr_err("%s: invalid index %u\n", __func__, idx);
203 return ERR_PTR(-EINVAL);
206 return cc->rclks[idx] ? &cc->rclks[idx]->hw : ERR_PTR(-ENOENT);
209 int qcom_cc_really_probe(struct platform_device *pdev,
210 const struct qcom_cc_desc *desc, struct regmap *regmap)
213 struct device *dev = &pdev->dev;
214 struct qcom_reset_controller *reset;
216 struct gdsc_desc *scd;
217 size_t num_clks = desc->num_clks;
218 struct clk_regmap **rclks = desc->clks;
220 cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
225 cc->num_rclks = num_clks;
227 for (i = 0; i < num_clks; i++) {
231 ret = devm_clk_register_regmap(dev, rclks[i]);
236 ret = of_clk_add_hw_provider(dev->of_node, qcom_cc_clk_hw_get, cc);
240 ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider,
247 reset->rcdev.of_node = dev->of_node;
248 reset->rcdev.ops = &qcom_reset_ops;
249 reset->rcdev.owner = dev->driver->owner;
250 reset->rcdev.nr_resets = desc->num_resets;
251 reset->regmap = regmap;
252 reset->reset_map = desc->resets;
254 ret = reset_controller_register(&reset->rcdev);
258 ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister,
264 if (desc->gdscs && desc->num_gdscs) {
265 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
269 scd->scs = desc->gdscs;
270 scd->num = desc->num_gdscs;
271 ret = gdsc_register(scd, &reset->rcdev, regmap);
274 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
282 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
284 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
286 struct regmap *regmap;
288 regmap = qcom_cc_map(pdev, desc);
290 return PTR_ERR(regmap);
292 return qcom_cc_really_probe(pdev, desc, regmap);
294 EXPORT_SYMBOL_GPL(qcom_cc_probe);
296 MODULE_LICENSE("GPL v2");