156 lines
4.4 KiB
C
156 lines
4.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* MStar MSC313 MPLL driver
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*
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* Copyright (C) 2020 Daniel Palmer <daniel@thingy.jp>
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*/
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#include <linux/platform_device.h>
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#include <linux/of_address.h>
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#include <linux/clk-provider.h>
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#include <linux/regmap.h>
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#define REG_CONFIG1 0x8
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#define REG_CONFIG2 0xc
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static const struct regmap_config msc313_mpll_regmap_config = {
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.reg_bits = 16,
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.val_bits = 16,
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.reg_stride = 4,
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};
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static const struct reg_field config1_loop_div_first = REG_FIELD(REG_CONFIG1, 8, 9);
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static const struct reg_field config1_input_div_first = REG_FIELD(REG_CONFIG1, 4, 5);
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static const struct reg_field config2_output_div_first = REG_FIELD(REG_CONFIG2, 12, 13);
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static const struct reg_field config2_loop_div_second = REG_FIELD(REG_CONFIG2, 0, 7);
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static const unsigned int output_dividers[] = {
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2, 3, 4, 5, 6, 7, 10
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};
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#define NUMOUTPUTS (ARRAY_SIZE(output_dividers) + 1)
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struct msc313_mpll {
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struct clk_hw clk_hw;
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struct regmap_field *input_div;
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struct regmap_field *loop_div_first;
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struct regmap_field *loop_div_second;
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struct regmap_field *output_div;
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struct clk_hw_onecell_data *clk_data;
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};
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#define to_mpll(_hw) container_of(_hw, struct msc313_mpll, clk_hw)
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static unsigned long msc313_mpll_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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struct msc313_mpll *mpll = to_mpll(hw);
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unsigned int input_div, output_div, loop_first, loop_second;
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unsigned long output_rate;
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regmap_field_read(mpll->input_div, &input_div);
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regmap_field_read(mpll->output_div, &output_div);
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regmap_field_read(mpll->loop_div_first, &loop_first);
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regmap_field_read(mpll->loop_div_second, &loop_second);
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output_rate = parent_rate / (1 << input_div);
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output_rate *= (1 << loop_first) * max(loop_second, 1U);
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output_rate /= max(output_div, 1U);
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return output_rate;
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}
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static const struct clk_ops msc313_mpll_ops = {
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.recalc_rate = msc313_mpll_recalc_rate,
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};
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static const struct clk_parent_data mpll_parent = {
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.index = 0,
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};
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static int msc313_mpll_probe(struct platform_device *pdev)
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{
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void __iomem *base;
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struct msc313_mpll *mpll;
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struct clk_init_data clk_init = { };
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struct device *dev = &pdev->dev;
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struct regmap *regmap;
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char *outputname;
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struct clk_hw *divhw;
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int ret, i;
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mpll = devm_kzalloc(dev, sizeof(*mpll), GFP_KERNEL);
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if (!mpll)
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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, &msc313_mpll_regmap_config);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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mpll->input_div = devm_regmap_field_alloc(dev, regmap, config1_input_div_first);
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if (IS_ERR(mpll->input_div))
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return PTR_ERR(mpll->input_div);
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mpll->output_div = devm_regmap_field_alloc(dev, regmap, config2_output_div_first);
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if (IS_ERR(mpll->output_div))
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return PTR_ERR(mpll->output_div);
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mpll->loop_div_first = devm_regmap_field_alloc(dev, regmap, config1_loop_div_first);
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if (IS_ERR(mpll->loop_div_first))
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return PTR_ERR(mpll->loop_div_first);
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mpll->loop_div_second = devm_regmap_field_alloc(dev, regmap, config2_loop_div_second);
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if (IS_ERR(mpll->loop_div_second))
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return PTR_ERR(mpll->loop_div_second);
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mpll->clk_data = devm_kzalloc(dev, struct_size(mpll->clk_data, hws,
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ARRAY_SIZE(output_dividers)), GFP_KERNEL);
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if (!mpll->clk_data)
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return -ENOMEM;
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clk_init.name = dev_name(dev);
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clk_init.ops = &msc313_mpll_ops;
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clk_init.parent_data = &mpll_parent;
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clk_init.num_parents = 1;
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mpll->clk_hw.init = &clk_init;
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ret = devm_clk_hw_register(dev, &mpll->clk_hw);
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if (ret)
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return ret;
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mpll->clk_data->num = NUMOUTPUTS;
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mpll->clk_data->hws[0] = &mpll->clk_hw;
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for (i = 0; i < ARRAY_SIZE(output_dividers); i++) {
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outputname = devm_kasprintf(dev, GFP_KERNEL, "%s_div_%u",
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clk_init.name, output_dividers[i]);
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if (!outputname)
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return -ENOMEM;
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divhw = devm_clk_hw_register_fixed_factor(dev, outputname,
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clk_init.name, 0, 1, output_dividers[i]);
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if (IS_ERR(divhw))
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return PTR_ERR(divhw);
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mpll->clk_data->hws[i + 1] = divhw;
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}
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platform_set_drvdata(pdev, mpll);
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return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get,
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mpll->clk_data);
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}
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static const struct of_device_id msc313_mpll_of_match[] = {
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{ .compatible = "mstar,msc313-mpll", },
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{}
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};
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static struct platform_driver msc313_mpll_driver = {
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.driver = {
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.name = "mstar-msc313-mpll",
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.of_match_table = msc313_mpll_of_match,
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},
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.probe = msc313_mpll_probe,
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};
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builtin_platform_driver(msc313_mpll_driver);
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