1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.
6 #include <linux/export.h>
7 #include <linux/module.h>
8 #include <linux/regmap.h>
9 #include <linux/platform_device.h>
10 #include <linux/clk-provider.h>
11 #include <linux/reset-controller.h>
16 #include "clk-regmap.h"
21 struct qcom_reset_controller reset;
22 struct clk_regmap **rclks;
27 struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
39 /* Default to our fastest rate */
42 EXPORT_SYMBOL_GPL(qcom_find_freq);
44 const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
47 const struct freq_tbl *best = NULL;
49 for ( ; f->freq; f++) {
58 EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
60 int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src)
62 int i, num_parents = clk_hw_get_num_parents(hw);
64 for (i = 0; i < num_parents; i++)
65 if (src == map[i].src)
70 EXPORT_SYMBOL_GPL(qcom_find_src_index);
72 int qcom_find_cfg_index(struct clk_hw *hw, const struct parent_map *map, u8 cfg)
74 int i, num_parents = clk_hw_get_num_parents(hw);
76 for (i = 0; i < num_parents; i++)
77 if (cfg == map[i].cfg)
82 EXPORT_SYMBOL_GPL(qcom_find_cfg_index);
85 qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc)
88 struct device *dev = &pdev->dev;
90 base = devm_platform_ioremap_resource(pdev, 0);
92 return ERR_CAST(base);
94 return devm_regmap_init_mmio(dev, base, desc->config);
96 EXPORT_SYMBOL_GPL(qcom_cc_map);
99 qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count)
104 /* De-assert reset to FSM */
105 regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0);
107 /* Program bias count and lock count */
108 val = bias_count << PLL_BIAS_COUNT_SHIFT |
109 lock_count << PLL_LOCK_COUNT_SHIFT;
110 mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT;
111 mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT;
112 regmap_update_bits(map, reg, mask, val);
114 /* Enable PLL FSM voting */
115 regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA);
117 EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode);
119 static void qcom_cc_gdsc_unregister(void *data)
121 gdsc_unregister(data);
125 * Backwards compatibility with old DTs. Register a pass-through factor 1/1
126 * clock to translate 'path' clk into 'name' clk and register the 'path'
127 * clk as a fixed rate clock if it isn't present.
129 static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
130 const char *name, unsigned long rate,
133 struct device_node *node = NULL;
134 struct device_node *clocks_node;
135 struct clk_fixed_factor *factor;
136 struct clk_fixed_rate *fixed;
137 struct clk_init_data init_data = { };
140 clocks_node = of_find_node_by_path("/clocks");
142 node = of_get_child_by_name(clocks_node, path);
143 of_node_put(clocks_node);
147 fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL);
151 fixed->fixed_rate = rate;
152 fixed->hw.init = &init_data;
154 init_data.name = path;
155 init_data.ops = &clk_fixed_rate_ops;
157 ret = devm_clk_hw_register(dev, &fixed->hw);
164 factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL);
168 factor->mult = factor->div = 1;
169 factor->hw.init = &init_data;
171 init_data.name = name;
172 init_data.parent_names = &path;
173 init_data.num_parents = 1;
175 init_data.ops = &clk_fixed_factor_ops;
177 ret = devm_clk_hw_register(dev, &factor->hw);
185 int qcom_cc_register_board_clk(struct device *dev, const char *path,
186 const char *name, unsigned long rate)
188 bool add_factor = true;
191 * TODO: The RPM clock driver currently does not support the xo clock.
192 * When xo is added to the RPM clock driver, we should change this
193 * function to skip registration of xo factor clocks.
196 return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor);
198 EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk);
200 int qcom_cc_register_sleep_clk(struct device *dev)
202 return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src",
205 EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk);
207 /* Drop 'protected-clocks' from the list of clocks to register */
208 static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc)
210 struct device_node *np = dev->of_node;
211 struct property *prop;
215 of_property_for_each_u32(np, "protected-clocks", prop, p, i) {
216 if (i >= cc->num_rclks)
223 static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec,
226 struct qcom_cc *cc = data;
227 unsigned int idx = clkspec->args[0];
229 if (idx >= cc->num_rclks) {
230 pr_err("%s: invalid index %u\n", __func__, idx);
231 return ERR_PTR(-EINVAL);
234 return cc->rclks[idx] ? &cc->rclks[idx]->hw : NULL;
237 int qcom_cc_really_probe(struct platform_device *pdev,
238 const struct qcom_cc_desc *desc, struct regmap *regmap)
241 struct device *dev = &pdev->dev;
242 struct qcom_reset_controller *reset;
244 struct gdsc_desc *scd;
245 size_t num_clks = desc->num_clks;
246 struct clk_regmap **rclks = desc->clks;
247 size_t num_clk_hws = desc->num_clk_hws;
248 struct clk_hw **clk_hws = desc->clk_hws;
250 cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL);
255 reset->rcdev.of_node = dev->of_node;
256 reset->rcdev.ops = &qcom_reset_ops;
257 reset->rcdev.owner = dev->driver->owner;
258 reset->rcdev.nr_resets = desc->num_resets;
259 reset->regmap = regmap;
260 reset->reset_map = desc->resets;
262 ret = devm_reset_controller_register(dev, &reset->rcdev);
266 if (desc->gdscs && desc->num_gdscs) {
267 scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL);
271 scd->scs = desc->gdscs;
272 scd->num = desc->num_gdscs;
273 ret = gdsc_register(scd, &reset->rcdev, regmap);
276 ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister,
283 cc->num_rclks = num_clks;
285 qcom_cc_drop_protected(dev, cc);
287 for (i = 0; i < num_clk_hws; i++) {
288 ret = devm_clk_hw_register(dev, clk_hws[i]);
293 for (i = 0; i < num_clks; i++) {
297 ret = devm_clk_register_regmap(dev, rclks[i]);
302 ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc);
308 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
310 int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc)
312 struct regmap *regmap;
314 regmap = qcom_cc_map(pdev, desc);
316 return PTR_ERR(regmap);
318 return qcom_cc_really_probe(pdev, desc, regmap);
320 EXPORT_SYMBOL_GPL(qcom_cc_probe);
322 int qcom_cc_probe_by_index(struct platform_device *pdev, int index,
323 const struct qcom_cc_desc *desc)
325 struct regmap *regmap;
328 base = devm_platform_ioremap_resource(pdev, index);
332 regmap = devm_regmap_init_mmio(&pdev->dev, base, desc->config);
334 return PTR_ERR(regmap);
336 return qcom_cc_really_probe(pdev, desc, regmap);
338 EXPORT_SYMBOL_GPL(qcom_cc_probe_by_index);
340 MODULE_LICENSE("GPL v2");