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340 lines
7.7 KiB
340 lines
7.7 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved. |
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*/ |
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#include <linux/export.h> |
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#include <linux/module.h> |
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#include <linux/regmap.h> |
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#include <linux/platform_device.h> |
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#include <linux/clk-provider.h> |
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#include <linux/reset-controller.h> |
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#include <linux/of.h> |
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#include "common.h" |
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#include "clk-rcg.h" |
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#include "clk-regmap.h" |
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#include "reset.h" |
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#include "gdsc.h" |
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struct qcom_cc { |
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struct qcom_reset_controller reset; |
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struct clk_regmap **rclks; |
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size_t num_rclks; |
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}; |
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const |
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struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) |
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{ |
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if (!f) |
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return NULL; |
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if (!f->freq) |
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return f; |
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for (; f->freq; f++) |
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if (rate <= f->freq) |
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return f; |
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/* Default to our fastest rate */ |
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return f - 1; |
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} |
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EXPORT_SYMBOL_GPL(qcom_find_freq); |
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const struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f, |
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unsigned long rate) |
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{ |
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const struct freq_tbl *best = NULL; |
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for ( ; f->freq; f++) { |
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if (rate >= f->freq) |
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best = f; |
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else |
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break; |
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} |
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return best; |
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} |
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EXPORT_SYMBOL_GPL(qcom_find_freq_floor); |
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int qcom_find_src_index(struct clk_hw *hw, const struct parent_map *map, u8 src) |
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{ |
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int i, num_parents = clk_hw_get_num_parents(hw); |
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for (i = 0; i < num_parents; i++) |
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if (src == map[i].src) |
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return i; |
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return -ENOENT; |
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} |
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EXPORT_SYMBOL_GPL(qcom_find_src_index); |
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int qcom_find_cfg_index(struct clk_hw *hw, const struct parent_map *map, u8 cfg) |
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{ |
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int i, num_parents = clk_hw_get_num_parents(hw); |
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for (i = 0; i < num_parents; i++) |
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if (cfg == map[i].cfg) |
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return i; |
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return -ENOENT; |
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} |
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EXPORT_SYMBOL_GPL(qcom_find_cfg_index); |
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struct regmap * |
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qcom_cc_map(struct platform_device *pdev, const struct qcom_cc_desc *desc) |
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{ |
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void __iomem *base; |
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struct device *dev = &pdev->dev; |
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base = devm_platform_ioremap_resource(pdev, 0); |
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if (IS_ERR(base)) |
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return ERR_CAST(base); |
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return devm_regmap_init_mmio(dev, base, desc->config); |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_map); |
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void |
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qcom_pll_set_fsm_mode(struct regmap *map, u32 reg, u8 bias_count, u8 lock_count) |
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{ |
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u32 val; |
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u32 mask; |
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/* De-assert reset to FSM */ |
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regmap_update_bits(map, reg, PLL_VOTE_FSM_RESET, 0); |
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/* Program bias count and lock count */ |
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val = bias_count << PLL_BIAS_COUNT_SHIFT | |
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lock_count << PLL_LOCK_COUNT_SHIFT; |
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mask = PLL_BIAS_COUNT_MASK << PLL_BIAS_COUNT_SHIFT; |
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mask |= PLL_LOCK_COUNT_MASK << PLL_LOCK_COUNT_SHIFT; |
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regmap_update_bits(map, reg, mask, val); |
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/* Enable PLL FSM voting */ |
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regmap_update_bits(map, reg, PLL_VOTE_FSM_ENA, PLL_VOTE_FSM_ENA); |
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} |
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EXPORT_SYMBOL_GPL(qcom_pll_set_fsm_mode); |
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static void qcom_cc_gdsc_unregister(void *data) |
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{ |
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gdsc_unregister(data); |
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} |
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/* |
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* Backwards compatibility with old DTs. Register a pass-through factor 1/1 |
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* clock to translate 'path' clk into 'name' clk and register the 'path' |
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* clk as a fixed rate clock if it isn't present. |
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*/ |
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static int _qcom_cc_register_board_clk(struct device *dev, const char *path, |
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const char *name, unsigned long rate, |
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bool add_factor) |
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{ |
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struct device_node *node = NULL; |
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struct device_node *clocks_node; |
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struct clk_fixed_factor *factor; |
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struct clk_fixed_rate *fixed; |
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struct clk_init_data init_data = { }; |
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int ret; |
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clocks_node = of_find_node_by_path("/clocks"); |
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if (clocks_node) { |
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node = of_get_child_by_name(clocks_node, path); |
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of_node_put(clocks_node); |
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} |
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if (!node) { |
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fixed = devm_kzalloc(dev, sizeof(*fixed), GFP_KERNEL); |
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if (!fixed) |
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return -EINVAL; |
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fixed->fixed_rate = rate; |
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fixed->hw.init = &init_data; |
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init_data.name = path; |
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init_data.ops = &clk_fixed_rate_ops; |
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ret = devm_clk_hw_register(dev, &fixed->hw); |
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if (ret) |
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return ret; |
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} |
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of_node_put(node); |
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if (add_factor) { |
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factor = devm_kzalloc(dev, sizeof(*factor), GFP_KERNEL); |
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if (!factor) |
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return -EINVAL; |
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factor->mult = factor->div = 1; |
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factor->hw.init = &init_data; |
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init_data.name = name; |
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init_data.parent_names = &path; |
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init_data.num_parents = 1; |
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init_data.flags = 0; |
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init_data.ops = &clk_fixed_factor_ops; |
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ret = devm_clk_hw_register(dev, &factor->hw); |
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if (ret) |
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return ret; |
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} |
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return 0; |
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} |
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int qcom_cc_register_board_clk(struct device *dev, const char *path, |
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const char *name, unsigned long rate) |
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{ |
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bool add_factor = true; |
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/* |
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* TODO: The RPM clock driver currently does not support the xo clock. |
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* When xo is added to the RPM clock driver, we should change this |
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* function to skip registration of xo factor clocks. |
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*/ |
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return _qcom_cc_register_board_clk(dev, path, name, rate, add_factor); |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_register_board_clk); |
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int qcom_cc_register_sleep_clk(struct device *dev) |
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{ |
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return _qcom_cc_register_board_clk(dev, "sleep_clk", "sleep_clk_src", |
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32768, true); |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_register_sleep_clk); |
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/* Drop 'protected-clocks' from the list of clocks to register */ |
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static void qcom_cc_drop_protected(struct device *dev, struct qcom_cc *cc) |
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{ |
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struct device_node *np = dev->of_node; |
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struct property *prop; |
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const __be32 *p; |
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u32 i; |
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of_property_for_each_u32(np, "protected-clocks", prop, p, i) { |
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if (i >= cc->num_rclks) |
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continue; |
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cc->rclks[i] = NULL; |
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} |
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} |
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static struct clk_hw *qcom_cc_clk_hw_get(struct of_phandle_args *clkspec, |
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void *data) |
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{ |
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struct qcom_cc *cc = data; |
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unsigned int idx = clkspec->args[0]; |
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if (idx >= cc->num_rclks) { |
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pr_err("%s: invalid index %u\n", __func__, idx); |
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return ERR_PTR(-EINVAL); |
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} |
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return cc->rclks[idx] ? &cc->rclks[idx]->hw : NULL; |
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} |
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int qcom_cc_really_probe(struct platform_device *pdev, |
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const struct qcom_cc_desc *desc, struct regmap *regmap) |
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{ |
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int i, ret; |
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struct device *dev = &pdev->dev; |
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struct qcom_reset_controller *reset; |
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struct qcom_cc *cc; |
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struct gdsc_desc *scd; |
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size_t num_clks = desc->num_clks; |
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struct clk_regmap **rclks = desc->clks; |
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size_t num_clk_hws = desc->num_clk_hws; |
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struct clk_hw **clk_hws = desc->clk_hws; |
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cc = devm_kzalloc(dev, sizeof(*cc), GFP_KERNEL); |
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if (!cc) |
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return -ENOMEM; |
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reset = &cc->reset; |
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reset->rcdev.of_node = dev->of_node; |
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reset->rcdev.ops = &qcom_reset_ops; |
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reset->rcdev.owner = dev->driver->owner; |
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reset->rcdev.nr_resets = desc->num_resets; |
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reset->regmap = regmap; |
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reset->reset_map = desc->resets; |
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ret = devm_reset_controller_register(dev, &reset->rcdev); |
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if (ret) |
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return ret; |
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if (desc->gdscs && desc->num_gdscs) { |
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scd = devm_kzalloc(dev, sizeof(*scd), GFP_KERNEL); |
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if (!scd) |
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return -ENOMEM; |
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scd->dev = dev; |
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scd->scs = desc->gdscs; |
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scd->num = desc->num_gdscs; |
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ret = gdsc_register(scd, &reset->rcdev, regmap); |
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if (ret) |
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return ret; |
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ret = devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister, |
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scd); |
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if (ret) |
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return ret; |
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} |
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cc->rclks = rclks; |
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cc->num_rclks = num_clks; |
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qcom_cc_drop_protected(dev, cc); |
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for (i = 0; i < num_clk_hws; i++) { |
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ret = devm_clk_hw_register(dev, clk_hws[i]); |
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if (ret) |
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return ret; |
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} |
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for (i = 0; i < num_clks; i++) { |
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if (!rclks[i]) |
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continue; |
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ret = devm_clk_register_regmap(dev, rclks[i]); |
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if (ret) |
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return ret; |
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} |
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ret = devm_of_clk_add_hw_provider(dev, qcom_cc_clk_hw_get, cc); |
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if (ret) |
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return ret; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_really_probe); |
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int qcom_cc_probe(struct platform_device *pdev, const struct qcom_cc_desc *desc) |
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{ |
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struct regmap *regmap; |
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regmap = qcom_cc_map(pdev, desc); |
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if (IS_ERR(regmap)) |
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return PTR_ERR(regmap); |
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return qcom_cc_really_probe(pdev, desc, regmap); |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_probe); |
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int qcom_cc_probe_by_index(struct platform_device *pdev, int index, |
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const struct qcom_cc_desc *desc) |
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{ |
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struct regmap *regmap; |
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void __iomem *base; |
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base = devm_platform_ioremap_resource(pdev, index); |
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if (IS_ERR(base)) |
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return -ENOMEM; |
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regmap = devm_regmap_init_mmio(&pdev->dev, base, desc->config); |
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if (IS_ERR(regmap)) |
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return PTR_ERR(regmap); |
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return qcom_cc_really_probe(pdev, desc, regmap); |
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} |
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EXPORT_SYMBOL_GPL(qcom_cc_probe_by_index); |
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MODULE_LICENSE("GPL v2");
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