diff options
Diffstat (limited to 'drivers/clk/clk-lochnagar.c')
| -rw-r--r-- | drivers/clk/clk-lochnagar.c | 303 |
1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/clk/clk-lochnagar.c b/drivers/clk/clk-lochnagar.c new file mode 100644 index 000000000..565bcd0cd --- /dev/null +++ b/drivers/clk/clk-lochnagar.c @@ -0,0 +1,303 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Lochnagar clock control + * + * Copyright (c) 2017-2018 Cirrus Logic, Inc. and + * Cirrus Logic International Semiconductor Ltd. + * + * Author: Charles Keepax <ckeepax@opensource.cirrus.com> + */ + +#include <linux/clk-provider.h> +#include <linux/device.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/of_device.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include <linux/mfd/lochnagar1_regs.h> +#include <linux/mfd/lochnagar2_regs.h> + +#include <dt-bindings/clk/lochnagar.h> + +#define LOCHNAGAR_NUM_CLOCKS (LOCHNAGAR_SPDIF_CLKOUT + 1) + +struct lochnagar_clk { + const char * const name; + struct clk_hw hw; + + struct lochnagar_clk_priv *priv; + + u16 cfg_reg; + u16 ena_mask; + + u16 src_reg; + u16 src_mask; +}; + +struct lochnagar_clk_priv { + struct device *dev; + struct regmap *regmap; + + struct lochnagar_clk lclks[LOCHNAGAR_NUM_CLOCKS]; +}; + +#define LN_PARENT(NAME) { .name = NAME, .fw_name = NAME } + +static const struct clk_parent_data lochnagar1_clk_parents[] = { + LN_PARENT("ln-none"), + LN_PARENT("ln-spdif-mclk"), + LN_PARENT("ln-psia1-mclk"), + LN_PARENT("ln-psia2-mclk"), + LN_PARENT("ln-cdc-clkout"), + LN_PARENT("ln-dsp-clkout"), + LN_PARENT("ln-pmic-32k"), + LN_PARENT("ln-gf-mclk1"), + LN_PARENT("ln-gf-mclk3"), + LN_PARENT("ln-gf-mclk2"), + LN_PARENT("ln-gf-mclk4"), +}; + +static const struct clk_parent_data lochnagar2_clk_parents[] = { + LN_PARENT("ln-none"), + LN_PARENT("ln-cdc-clkout"), + LN_PARENT("ln-dsp-clkout"), + LN_PARENT("ln-pmic-32k"), + LN_PARENT("ln-spdif-mclk"), + LN_PARENT("ln-clk-12m"), + LN_PARENT("ln-clk-11m"), + LN_PARENT("ln-clk-24m"), + LN_PARENT("ln-clk-22m"), + LN_PARENT("ln-clk-8m"), + LN_PARENT("ln-usb-clk-24m"), + LN_PARENT("ln-gf-mclk1"), + LN_PARENT("ln-gf-mclk3"), + LN_PARENT("ln-gf-mclk2"), + LN_PARENT("ln-psia1-mclk"), + LN_PARENT("ln-psia2-mclk"), + LN_PARENT("ln-spdif-clkout"), + LN_PARENT("ln-adat-mclk"), + LN_PARENT("ln-usb-clk-12m"), +}; + +#define LN1_CLK(ID, NAME, REG) \ + [LOCHNAGAR_##ID] = { \ + .name = NAME, \ + .cfg_reg = LOCHNAGAR1_##REG, \ + .ena_mask = LOCHNAGAR1_##ID##_ENA_MASK, \ + .src_reg = LOCHNAGAR1_##ID##_SEL, \ + .src_mask = LOCHNAGAR1_SRC_MASK, \ + } + +#define LN2_CLK(ID, NAME) \ + [LOCHNAGAR_##ID] = { \ + .name = NAME, \ + .cfg_reg = LOCHNAGAR2_##ID##_CTRL, \ + .src_reg = LOCHNAGAR2_##ID##_CTRL, \ + .ena_mask = LOCHNAGAR2_CLK_ENA_MASK, \ + .src_mask = LOCHNAGAR2_CLK_SRC_MASK, \ + } + +static const struct lochnagar_clk lochnagar1_clks[LOCHNAGAR_NUM_CLOCKS] = { + LN1_CLK(CDC_MCLK1, "ln-cdc-mclk1", CDC_AIF_CTRL2), + LN1_CLK(CDC_MCLK2, "ln-cdc-mclk2", CDC_AIF_CTRL2), + LN1_CLK(DSP_CLKIN, "ln-dsp-clkin", DSP_AIF), + LN1_CLK(GF_CLKOUT1, "ln-gf-clkout1", GF_AIF1), +}; + +static const struct lochnagar_clk lochnagar2_clks[LOCHNAGAR_NUM_CLOCKS] = { + LN2_CLK(CDC_MCLK1, "ln-cdc-mclk1"), + LN2_CLK(CDC_MCLK2, "ln-cdc-mclk2"), + LN2_CLK(DSP_CLKIN, "ln-dsp-clkin"), + LN2_CLK(GF_CLKOUT1, "ln-gf-clkout1"), + LN2_CLK(GF_CLKOUT2, "ln-gf-clkout2"), + LN2_CLK(PSIA1_MCLK, "ln-psia1-mclk"), + LN2_CLK(PSIA2_MCLK, "ln-psia2-mclk"), + LN2_CLK(SPDIF_MCLK, "ln-spdif-mclk"), + LN2_CLK(ADAT_MCLK, "ln-adat-mclk"), + LN2_CLK(SOUNDCARD_MCLK, "ln-soundcard-mclk"), +}; + +struct lochnagar_config { + const struct clk_parent_data *parents; + int nparents; + const struct lochnagar_clk *clks; +}; + +static const struct lochnagar_config lochnagar1_conf = { + .parents = lochnagar1_clk_parents, + .nparents = ARRAY_SIZE(lochnagar1_clk_parents), + .clks = lochnagar1_clks, +}; + +static const struct lochnagar_config lochnagar2_conf = { + .parents = lochnagar2_clk_parents, + .nparents = ARRAY_SIZE(lochnagar2_clk_parents), + .clks = lochnagar2_clks, +}; + +static inline struct lochnagar_clk *lochnagar_hw_to_lclk(struct clk_hw *hw) +{ + return container_of(hw, struct lochnagar_clk, hw); +} + +static int lochnagar_clk_prepare(struct clk_hw *hw) +{ + struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw); + struct lochnagar_clk_priv *priv = lclk->priv; + struct regmap *regmap = priv->regmap; + int ret; + + ret = regmap_update_bits(regmap, lclk->cfg_reg, + lclk->ena_mask, lclk->ena_mask); + if (ret < 0) + dev_dbg(priv->dev, "Failed to prepare %s: %d\n", + lclk->name, ret); + + return ret; +} + +static void lochnagar_clk_unprepare(struct clk_hw *hw) +{ + struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw); + struct lochnagar_clk_priv *priv = lclk->priv; + struct regmap *regmap = priv->regmap; + int ret; + + ret = regmap_update_bits(regmap, lclk->cfg_reg, lclk->ena_mask, 0); + if (ret < 0) + dev_dbg(priv->dev, "Failed to unprepare %s: %d\n", + lclk->name, ret); +} + +static int lochnagar_clk_set_parent(struct clk_hw *hw, u8 index) +{ + struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw); + struct lochnagar_clk_priv *priv = lclk->priv; + struct regmap *regmap = priv->regmap; + int ret; + + ret = regmap_update_bits(regmap, lclk->src_reg, lclk->src_mask, index); + if (ret < 0) + dev_dbg(priv->dev, "Failed to reparent %s: %d\n", + lclk->name, ret); + + return ret; +} + +static u8 lochnagar_clk_get_parent(struct clk_hw *hw) +{ + struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw); + struct lochnagar_clk_priv *priv = lclk->priv; + struct regmap *regmap = priv->regmap; + unsigned int val; + int ret; + + ret = regmap_read(regmap, lclk->src_reg, &val); + if (ret < 0) { + dev_dbg(priv->dev, "Failed to read parent of %s: %d\n", + lclk->name, ret); + return clk_hw_get_num_parents(hw); + } + + val &= lclk->src_mask; + + return val; +} + +static const struct clk_ops lochnagar_clk_ops = { + .prepare = lochnagar_clk_prepare, + .unprepare = lochnagar_clk_unprepare, + .set_parent = lochnagar_clk_set_parent, + .get_parent = lochnagar_clk_get_parent, +}; + +static struct clk_hw * +lochnagar_of_clk_hw_get(struct of_phandle_args *clkspec, void *data) +{ + struct lochnagar_clk_priv *priv = data; + unsigned int idx = clkspec->args[0]; + + if (idx >= ARRAY_SIZE(priv->lclks)) { + dev_err(priv->dev, "Invalid index %u\n", idx); + return ERR_PTR(-EINVAL); + } + + return &priv->lclks[idx].hw; +} + +static const struct of_device_id lochnagar_of_match[] = { + { .compatible = "cirrus,lochnagar1-clk", .data = &lochnagar1_conf }, + { .compatible = "cirrus,lochnagar2-clk", .data = &lochnagar2_conf }, + {} +}; +MODULE_DEVICE_TABLE(of, lochnagar_of_match); + +static int lochnagar_clk_probe(struct platform_device *pdev) +{ + struct clk_init_data clk_init = { + .ops = &lochnagar_clk_ops, + }; + struct device *dev = &pdev->dev; + struct lochnagar_clk_priv *priv; + const struct of_device_id *of_id; + struct lochnagar_clk *lclk; + struct lochnagar_config *conf; + int ret, i; + + of_id = of_match_device(lochnagar_of_match, dev); + if (!of_id) + return -EINVAL; + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + priv->dev = dev; + priv->regmap = dev_get_regmap(dev->parent, NULL); + conf = (struct lochnagar_config *)of_id->data; + + memcpy(priv->lclks, conf->clks, sizeof(priv->lclks)); + + clk_init.parent_data = conf->parents; + clk_init.num_parents = conf->nparents; + + for (i = 0; i < ARRAY_SIZE(priv->lclks); i++) { + lclk = &priv->lclks[i]; + + if (!lclk->name) + continue; + + clk_init.name = lclk->name; + + lclk->priv = priv; + lclk->hw.init = &clk_init; + + ret = devm_clk_hw_register(dev, &lclk->hw); + if (ret) { + dev_err(dev, "Failed to register %s: %d\n", + lclk->name, ret); + return ret; + } + } + + ret = devm_of_clk_add_hw_provider(dev, lochnagar_of_clk_hw_get, priv); + if (ret < 0) + dev_err(dev, "Failed to register provider: %d\n", ret); + + return ret; +} + +static struct platform_driver lochnagar_clk_driver = { + .driver = { + .name = "lochnagar-clk", + .of_match_table = lochnagar_of_match, + }, + .probe = lochnagar_clk_probe, +}; +module_platform_driver(lochnagar_clk_driver); + +MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>"); +MODULE_DESCRIPTION("Clock driver for Cirrus Logic Lochnagar Board"); +MODULE_LICENSE("GPL v2"); |