diff options
Diffstat (limited to 'drivers/clk/mstar/clk-msc313-mpll.c')
| -rw-r--r-- | drivers/clk/mstar/clk-msc313-mpll.c | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/drivers/clk/mstar/clk-msc313-mpll.c b/drivers/clk/mstar/clk-msc313-mpll.c new file mode 100644 index 000000000..61beb4e87 --- /dev/null +++ b/drivers/clk/mstar/clk-msc313-mpll.c @@ -0,0 +1,155 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * MStar MSC313 MPLL driver + * + * Copyright (C) 2020 Daniel Palmer <daniel@thingy.jp> + */ + +#include <linux/platform_device.h> +#include <linux/of_address.h> +#include <linux/clk-provider.h> +#include <linux/regmap.h> + +#define REG_CONFIG1 0x8 +#define REG_CONFIG2 0xc + +static const struct regmap_config msc313_mpll_regmap_config = { + .reg_bits = 16, + .val_bits = 16, + .reg_stride = 4, +}; + +static const struct reg_field config1_loop_div_first = REG_FIELD(REG_CONFIG1, 8, 9); +static const struct reg_field config1_input_div_first = REG_FIELD(REG_CONFIG1, 4, 5); +static const struct reg_field config2_output_div_first = REG_FIELD(REG_CONFIG2, 12, 13); +static const struct reg_field config2_loop_div_second = REG_FIELD(REG_CONFIG2, 0, 7); + +static const unsigned int output_dividers[] = { + 2, 3, 4, 5, 6, 7, 10 +}; + +#define NUMOUTPUTS (ARRAY_SIZE(output_dividers) + 1) + +struct msc313_mpll { + struct clk_hw clk_hw; + struct regmap_field *input_div; + struct regmap_field *loop_div_first; + struct regmap_field *loop_div_second; + struct regmap_field *output_div; + struct clk_hw_onecell_data *clk_data; +}; + +#define to_mpll(_hw) container_of(_hw, struct msc313_mpll, clk_hw) + +static unsigned long msc313_mpll_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct msc313_mpll *mpll = to_mpll(hw); + unsigned int input_div, output_div, loop_first, loop_second; + unsigned long output_rate; + + regmap_field_read(mpll->input_div, &input_div); + regmap_field_read(mpll->output_div, &output_div); + regmap_field_read(mpll->loop_div_first, &loop_first); + regmap_field_read(mpll->loop_div_second, &loop_second); + + output_rate = parent_rate / (1 << input_div); + output_rate *= (1 << loop_first) * max(loop_second, 1U); + output_rate /= max(output_div, 1U); + + return output_rate; +} + +static const struct clk_ops msc313_mpll_ops = { + .recalc_rate = msc313_mpll_recalc_rate, +}; + +static const struct clk_parent_data mpll_parent = { + .index = 0, +}; + +static int msc313_mpll_probe(struct platform_device *pdev) +{ + void __iomem *base; + struct msc313_mpll *mpll; + struct clk_init_data clk_init = { }; + struct device *dev = &pdev->dev; + struct regmap *regmap; + char *outputname; + struct clk_hw *divhw; + int ret, i; + + mpll = devm_kzalloc(dev, sizeof(*mpll), GFP_KERNEL); + if (!mpll) + return -ENOMEM; + + base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + regmap = devm_regmap_init_mmio(dev, base, &msc313_mpll_regmap_config); + if (IS_ERR(regmap)) + return PTR_ERR(regmap); + + mpll->input_div = devm_regmap_field_alloc(dev, regmap, config1_input_div_first); + if (IS_ERR(mpll->input_div)) + return PTR_ERR(mpll->input_div); + mpll->output_div = devm_regmap_field_alloc(dev, regmap, config2_output_div_first); + if (IS_ERR(mpll->output_div)) + return PTR_ERR(mpll->output_div); + mpll->loop_div_first = devm_regmap_field_alloc(dev, regmap, config1_loop_div_first); + if (IS_ERR(mpll->loop_div_first)) + return PTR_ERR(mpll->loop_div_first); + mpll->loop_div_second = devm_regmap_field_alloc(dev, regmap, config2_loop_div_second); + if (IS_ERR(mpll->loop_div_second)) + return PTR_ERR(mpll->loop_div_second); + + mpll->clk_data = devm_kzalloc(dev, struct_size(mpll->clk_data, hws, + ARRAY_SIZE(output_dividers)), GFP_KERNEL); + if (!mpll->clk_data) + return -ENOMEM; + + clk_init.name = dev_name(dev); + clk_init.ops = &msc313_mpll_ops; + clk_init.parent_data = &mpll_parent; + clk_init.num_parents = 1; + mpll->clk_hw.init = &clk_init; + + ret = devm_clk_hw_register(dev, &mpll->clk_hw); + if (ret) + return ret; + + mpll->clk_data->num = NUMOUTPUTS; + mpll->clk_data->hws[0] = &mpll->clk_hw; + + for (i = 0; i < ARRAY_SIZE(output_dividers); i++) { + outputname = devm_kasprintf(dev, GFP_KERNEL, "%s_div_%u", + clk_init.name, output_dividers[i]); + if (!outputname) + return -ENOMEM; + divhw = devm_clk_hw_register_fixed_factor(dev, outputname, + clk_init.name, 0, 1, output_dividers[i]); + if (IS_ERR(divhw)) + return PTR_ERR(divhw); + mpll->clk_data->hws[i + 1] = divhw; + } + + platform_set_drvdata(pdev, mpll); + + return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_hw_onecell_get, + mpll->clk_data); +} + +static const struct of_device_id msc313_mpll_of_match[] = { + { .compatible = "mstar,msc313-mpll", }, + {} +}; + +static struct platform_driver msc313_mpll_driver = { + .driver = { + .name = "mstar-msc313-mpll", + .of_match_table = msc313_mpll_of_match, + }, + .probe = msc313_mpll_probe, +}; +builtin_platform_driver(msc313_mpll_driver); |