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![Cai Huoqing](/assets/img/avatar_default.png)
Use the devm_platform_ioremap_resource() helper instead of calling platform_get_resource() and devm_ioremap_resource() separately Signed-off-by: Cai Huoqing <caihuoqing@baidu.com> Link: https://lore.kernel.org/r/20210907084843.3999-1-caihuoqing@baidu.com Signed-off-by: Stephen Boyd <sboyd@kernel.org>
168 lines
3.7 KiB
C
168 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Qualcomm A53 PLL driver
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*
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* Copyright (c) 2017, Linaro Limited
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* Author: Georgi Djakov <georgi.djakov@linaro.org>
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*/
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/pm_opp.h>
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#include <linux/regmap.h>
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#include <linux/module.h>
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#include "clk-pll.h"
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#include "clk-regmap.h"
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static const struct pll_freq_tbl a53pll_freq[] = {
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{ 998400000, 52, 0x0, 0x1, 0 },
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{ 1094400000, 57, 0x0, 0x1, 0 },
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{ 1152000000, 62, 0x0, 0x1, 0 },
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{ 1209600000, 63, 0x0, 0x1, 0 },
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{ 1248000000, 65, 0x0, 0x1, 0 },
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{ 1363200000, 71, 0x0, 0x1, 0 },
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{ 1401600000, 73, 0x0, 0x1, 0 },
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{ }
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};
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static const struct regmap_config a53pll_regmap_config = {
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.reg_bits = 32,
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.reg_stride = 4,
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.val_bits = 32,
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.max_register = 0x40,
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.fast_io = true,
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};
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static struct pll_freq_tbl *qcom_a53pll_get_freq_tbl(struct device *dev)
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{
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struct pll_freq_tbl *freq_tbl;
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unsigned long xo_freq;
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unsigned long freq;
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struct clk *xo_clk;
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int count;
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int ret;
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int i;
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xo_clk = devm_clk_get(dev, "xo");
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if (IS_ERR(xo_clk))
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return NULL;
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xo_freq = clk_get_rate(xo_clk);
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ret = devm_pm_opp_of_add_table(dev);
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if (ret)
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return NULL;
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count = dev_pm_opp_get_opp_count(dev);
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if (count <= 0)
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return NULL;
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freq_tbl = devm_kcalloc(dev, count + 1, sizeof(*freq_tbl), GFP_KERNEL);
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if (!freq_tbl)
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return NULL;
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for (i = 0, freq = 0; i < count; i++, freq++) {
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struct dev_pm_opp *opp;
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opp = dev_pm_opp_find_freq_ceil(dev, &freq);
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if (IS_ERR(opp))
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return NULL;
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/* Skip the freq that is not divisible */
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if (freq % xo_freq)
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continue;
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freq_tbl[i].freq = freq;
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freq_tbl[i].l = freq / xo_freq;
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freq_tbl[i].n = 1;
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dev_pm_opp_put(opp);
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}
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return freq_tbl;
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}
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static int qcom_a53pll_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *np = dev->of_node;
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struct regmap *regmap;
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struct clk_pll *pll;
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void __iomem *base;
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struct clk_init_data init = { };
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int ret;
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pll = devm_kzalloc(dev, sizeof(*pll), GFP_KERNEL);
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if (!pll)
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return -ENOMEM;
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base = devm_platform_ioremap_resource(pdev, 0);
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if (IS_ERR(base))
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return PTR_ERR(base);
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regmap = devm_regmap_init_mmio(dev, base, &a53pll_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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pll->l_reg = 0x04;
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pll->m_reg = 0x08;
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pll->n_reg = 0x0c;
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pll->config_reg = 0x14;
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pll->mode_reg = 0x00;
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pll->status_reg = 0x1c;
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pll->status_bit = 16;
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pll->freq_tbl = qcom_a53pll_get_freq_tbl(dev);
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if (!pll->freq_tbl) {
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/* Fall on a53pll_freq if no freq_tbl is found from OPP */
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pll->freq_tbl = a53pll_freq;
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}
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/* Use an unique name by appending @unit-address */
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init.name = devm_kasprintf(dev, GFP_KERNEL, "a53pll%s",
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strchrnul(np->full_name, '@'));
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if (!init.name)
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return -ENOMEM;
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init.parent_names = (const char *[]){ "xo" };
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init.num_parents = 1;
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init.ops = &clk_pll_sr2_ops;
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pll->clkr.hw.init = &init;
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ret = devm_clk_register_regmap(dev, &pll->clkr);
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if (ret) {
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dev_err(dev, "failed to register regmap clock: %d\n", ret);
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return ret;
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}
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ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get,
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&pll->clkr.hw);
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if (ret) {
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dev_err(dev, "failed to add clock provider: %d\n", 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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static const struct of_device_id qcom_a53pll_match_table[] = {
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{ .compatible = "qcom,msm8916-a53pll" },
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{ .compatible = "qcom,msm8939-a53pll" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, qcom_a53pll_match_table);
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static struct platform_driver qcom_a53pll_driver = {
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.probe = qcom_a53pll_probe,
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.driver = {
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.name = "qcom-a53pll",
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.of_match_table = qcom_a53pll_match_table,
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},
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};
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module_platform_driver(qcom_a53pll_driver);
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MODULE_DESCRIPTION("Qualcomm A53 PLL Driver");
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MODULE_LICENSE("GPL v2");
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