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-rw-r--r--sound/soc/codecs/tlv320aic32x4-clk.c499
1 files changed, 499 insertions, 0 deletions
diff --git a/sound/soc/codecs/tlv320aic32x4-clk.c b/sound/soc/codecs/tlv320aic32x4-clk.c
new file mode 100644
index 0000000000..5c0a76a4a1
--- /dev/null
+++ b/sound/soc/codecs/tlv320aic32x4-clk.c
@@ -0,0 +1,499 @@
+/* SPDX-License-Identifier: GPL-2.0
+ *
+ * Clock Tree for the Texas Instruments TLV320AIC32x4
+ *
+ * Copyright 2019 Annaliese McDermond
+ *
+ * Author: Annaliese McDermond <nh6z@nh6z.net>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/regmap.h>
+#include <linux/device.h>
+
+#include "tlv320aic32x4.h"
+
+#define to_clk_aic32x4(_hw) container_of(_hw, struct clk_aic32x4, hw)
+struct clk_aic32x4 {
+ struct clk_hw hw;
+ struct device *dev;
+ struct regmap *regmap;
+ unsigned int reg;
+};
+
+/*
+ * struct clk_aic32x4_pll_muldiv - Multiplier/divider settings
+ * @p: Divider
+ * @r: first multiplier
+ * @j: integer part of second multiplier
+ * @d: decimal part of second multiplier
+ */
+struct clk_aic32x4_pll_muldiv {
+ u8 p;
+ u16 r;
+ u8 j;
+ u16 d;
+};
+
+struct aic32x4_clkdesc {
+ const char *name;
+ const char * const *parent_names;
+ unsigned int num_parents;
+ const struct clk_ops *ops;
+ unsigned int reg;
+};
+
+static int clk_aic32x4_pll_prepare(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+
+ return regmap_update_bits(pll->regmap, AIC32X4_PLLPR,
+ AIC32X4_PLLEN, AIC32X4_PLLEN);
+}
+
+static void clk_aic32x4_pll_unprepare(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+
+ regmap_update_bits(pll->regmap, AIC32X4_PLLPR,
+ AIC32X4_PLLEN, 0);
+}
+
+static int clk_aic32x4_pll_is_prepared(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(pll->regmap, AIC32X4_PLLPR, &val);
+ if (ret < 0)
+ return ret;
+
+ return !!(val & AIC32X4_PLLEN);
+}
+
+static int clk_aic32x4_pll_get_muldiv(struct clk_aic32x4 *pll,
+ struct clk_aic32x4_pll_muldiv *settings)
+{
+ /* Change to use regmap_bulk_read? */
+ unsigned int val;
+ int ret;
+
+ ret = regmap_read(pll->regmap, AIC32X4_PLLPR, &val);
+ if (ret < 0)
+ return ret;
+ settings->r = val & AIC32X4_PLL_R_MASK;
+ settings->p = (val & AIC32X4_PLL_P_MASK) >> AIC32X4_PLL_P_SHIFT;
+
+ ret = regmap_read(pll->regmap, AIC32X4_PLLJ, &val);
+ if (ret < 0)
+ return ret;
+ settings->j = val;
+
+ ret = regmap_read(pll->regmap, AIC32X4_PLLDMSB, &val);
+ if (ret < 0)
+ return ret;
+ settings->d = val << 8;
+
+ ret = regmap_read(pll->regmap, AIC32X4_PLLDLSB, &val);
+ if (ret < 0)
+ return ret;
+ settings->d |= val;
+
+ return 0;
+}
+
+static int clk_aic32x4_pll_set_muldiv(struct clk_aic32x4 *pll,
+ struct clk_aic32x4_pll_muldiv *settings)
+{
+ int ret;
+ /* Change to use regmap_bulk_write for some if not all? */
+
+ ret = regmap_update_bits(pll->regmap, AIC32X4_PLLPR,
+ AIC32X4_PLL_R_MASK, settings->r);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(pll->regmap, AIC32X4_PLLPR,
+ AIC32X4_PLL_P_MASK,
+ settings->p << AIC32X4_PLL_P_SHIFT);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(pll->regmap, AIC32X4_PLLJ, settings->j);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(pll->regmap, AIC32X4_PLLDMSB, (settings->d >> 8));
+ if (ret < 0)
+ return ret;
+ ret = regmap_write(pll->regmap, AIC32X4_PLLDLSB, (settings->d & 0xff));
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static unsigned long clk_aic32x4_pll_calc_rate(
+ struct clk_aic32x4_pll_muldiv *settings,
+ unsigned long parent_rate)
+{
+ u64 rate;
+ /*
+ * We scale j by 10000 to account for the decimal part of P and divide
+ * it back out later.
+ */
+ rate = (u64) parent_rate * settings->r *
+ ((settings->j * 10000) + settings->d);
+
+ return (unsigned long) DIV_ROUND_UP_ULL(rate, settings->p * 10000);
+}
+
+static int clk_aic32x4_pll_calc_muldiv(struct clk_aic32x4_pll_muldiv *settings,
+ unsigned long rate, unsigned long parent_rate)
+{
+ u64 multiplier;
+
+ settings->p = parent_rate / AIC32X4_MAX_PLL_CLKIN + 1;
+ if (settings->p > 8)
+ return -1;
+
+ /*
+ * We scale this figure by 10000 so that we can get the decimal part
+ * of the multiplier. This is because we can't do floating point
+ * math in the kernel.
+ */
+ multiplier = (u64) rate * settings->p * 10000;
+ do_div(multiplier, parent_rate);
+
+ /*
+ * J can't be over 64, so R can scale this.
+ * R can't be greater than 4.
+ */
+ settings->r = ((u32) multiplier / 640000) + 1;
+ if (settings->r > 4)
+ return -1;
+ do_div(multiplier, settings->r);
+
+ /*
+ * J can't be < 1.
+ */
+ if (multiplier < 10000)
+ return -1;
+
+ /* Figure out the integer part, J, and the fractional part, D. */
+ settings->j = (u32) multiplier / 10000;
+ settings->d = (u32) multiplier % 10000;
+
+ return 0;
+}
+
+static unsigned long clk_aic32x4_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+ struct clk_aic32x4_pll_muldiv settings;
+ int ret;
+
+ ret = clk_aic32x4_pll_get_muldiv(pll, &settings);
+ if (ret < 0)
+ return 0;
+
+ return clk_aic32x4_pll_calc_rate(&settings, parent_rate);
+}
+
+static int clk_aic32x4_pll_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ struct clk_aic32x4_pll_muldiv settings;
+ int ret;
+
+ ret = clk_aic32x4_pll_calc_muldiv(&settings, req->rate, req->best_parent_rate);
+ if (ret < 0)
+ return -EINVAL;
+
+ req->rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate);
+
+ return 0;
+}
+
+static int clk_aic32x4_pll_set_rate(struct clk_hw *hw,
+ unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+ struct clk_aic32x4_pll_muldiv settings;
+ int ret;
+
+ ret = clk_aic32x4_pll_calc_muldiv(&settings, rate, parent_rate);
+ if (ret < 0)
+ return -EINVAL;
+
+ ret = clk_aic32x4_pll_set_muldiv(pll, &settings);
+ if (ret)
+ return ret;
+
+ /* 10ms is the delay to wait before the clocks are stable */
+ msleep(10);
+
+ return 0;
+}
+
+static int clk_aic32x4_pll_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+
+ return regmap_update_bits(pll->regmap,
+ AIC32X4_CLKMUX,
+ AIC32X4_PLL_CLKIN_MASK,
+ index << AIC32X4_PLL_CLKIN_SHIFT);
+}
+
+static u8 clk_aic32x4_pll_get_parent(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *pll = to_clk_aic32x4(hw);
+ unsigned int val;
+
+ regmap_read(pll->regmap, AIC32X4_PLLPR, &val);
+
+ return (val & AIC32X4_PLL_CLKIN_MASK) >> AIC32X4_PLL_CLKIN_SHIFT;
+}
+
+
+static const struct clk_ops aic32x4_pll_ops = {
+ .prepare = clk_aic32x4_pll_prepare,
+ .unprepare = clk_aic32x4_pll_unprepare,
+ .is_prepared = clk_aic32x4_pll_is_prepared,
+ .recalc_rate = clk_aic32x4_pll_recalc_rate,
+ .determine_rate = clk_aic32x4_pll_determine_rate,
+ .set_rate = clk_aic32x4_pll_set_rate,
+ .set_parent = clk_aic32x4_pll_set_parent,
+ .get_parent = clk_aic32x4_pll_get_parent,
+};
+
+static int clk_aic32x4_codec_clkin_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_aic32x4 *mux = to_clk_aic32x4(hw);
+
+ return regmap_update_bits(mux->regmap,
+ AIC32X4_CLKMUX,
+ AIC32X4_CODEC_CLKIN_MASK, index << AIC32X4_CODEC_CLKIN_SHIFT);
+}
+
+static u8 clk_aic32x4_codec_clkin_get_parent(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *mux = to_clk_aic32x4(hw);
+ unsigned int val;
+
+ regmap_read(mux->regmap, AIC32X4_CLKMUX, &val);
+
+ return (val & AIC32X4_CODEC_CLKIN_MASK) >> AIC32X4_CODEC_CLKIN_SHIFT;
+}
+
+static const struct clk_ops aic32x4_codec_clkin_ops = {
+ .determine_rate = clk_hw_determine_rate_no_reparent,
+ .set_parent = clk_aic32x4_codec_clkin_set_parent,
+ .get_parent = clk_aic32x4_codec_clkin_get_parent,
+};
+
+static int clk_aic32x4_div_prepare(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *div = to_clk_aic32x4(hw);
+
+ return regmap_update_bits(div->regmap, div->reg,
+ AIC32X4_DIVEN, AIC32X4_DIVEN);
+}
+
+static void clk_aic32x4_div_unprepare(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *div = to_clk_aic32x4(hw);
+
+ regmap_update_bits(div->regmap, div->reg,
+ AIC32X4_DIVEN, 0);
+}
+
+static int clk_aic32x4_div_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct clk_aic32x4 *div = to_clk_aic32x4(hw);
+ u8 divisor;
+
+ divisor = DIV_ROUND_UP(parent_rate, rate);
+ if (divisor > AIC32X4_DIV_MAX)
+ return -EINVAL;
+
+ return regmap_update_bits(div->regmap, div->reg,
+ AIC32X4_DIV_MASK, divisor);
+}
+
+static int clk_aic32x4_div_determine_rate(struct clk_hw *hw,
+ struct clk_rate_request *req)
+{
+ unsigned long divisor;
+
+ divisor = DIV_ROUND_UP(req->best_parent_rate, req->rate);
+ if (divisor > AIC32X4_DIV_MAX)
+ return -EINVAL;
+
+ req->rate = DIV_ROUND_UP(req->best_parent_rate, divisor);
+ return 0;
+}
+
+static unsigned long clk_aic32x4_div_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct clk_aic32x4 *div = to_clk_aic32x4(hw);
+ unsigned int val;
+ int err;
+
+ err = regmap_read(div->regmap, div->reg, &val);
+ if (err)
+ return 0;
+
+ val &= AIC32X4_DIV_MASK;
+ if (!val)
+ val = AIC32X4_DIV_MAX;
+
+ return DIV_ROUND_UP(parent_rate, val);
+}
+
+static const struct clk_ops aic32x4_div_ops = {
+ .prepare = clk_aic32x4_div_prepare,
+ .unprepare = clk_aic32x4_div_unprepare,
+ .set_rate = clk_aic32x4_div_set_rate,
+ .determine_rate = clk_aic32x4_div_determine_rate,
+ .recalc_rate = clk_aic32x4_div_recalc_rate,
+};
+
+static int clk_aic32x4_bdiv_set_parent(struct clk_hw *hw, u8 index)
+{
+ struct clk_aic32x4 *mux = to_clk_aic32x4(hw);
+
+ return regmap_update_bits(mux->regmap, AIC32X4_IFACE3,
+ AIC32X4_BDIVCLK_MASK, index);
+}
+
+static u8 clk_aic32x4_bdiv_get_parent(struct clk_hw *hw)
+{
+ struct clk_aic32x4 *mux = to_clk_aic32x4(hw);
+ unsigned int val;
+
+ regmap_read(mux->regmap, AIC32X4_IFACE3, &val);
+
+ return val & AIC32X4_BDIVCLK_MASK;
+}
+
+static const struct clk_ops aic32x4_bdiv_ops = {
+ .prepare = clk_aic32x4_div_prepare,
+ .unprepare = clk_aic32x4_div_unprepare,
+ .set_parent = clk_aic32x4_bdiv_set_parent,
+ .get_parent = clk_aic32x4_bdiv_get_parent,
+ .set_rate = clk_aic32x4_div_set_rate,
+ .determine_rate = clk_aic32x4_div_determine_rate,
+ .recalc_rate = clk_aic32x4_div_recalc_rate,
+};
+
+static struct aic32x4_clkdesc aic32x4_clkdesc_array[] = {
+ {
+ .name = "pll",
+ .parent_names =
+ (const char* []) { "mclk", "bclk", "gpio", "din" },
+ .num_parents = 4,
+ .ops = &aic32x4_pll_ops,
+ .reg = 0,
+ },
+ {
+ .name = "codec_clkin",
+ .parent_names =
+ (const char *[]) { "mclk", "bclk", "gpio", "pll" },
+ .num_parents = 4,
+ .ops = &aic32x4_codec_clkin_ops,
+ .reg = 0,
+ },
+ {
+ .name = "ndac",
+ .parent_names = (const char * []) { "codec_clkin" },
+ .num_parents = 1,
+ .ops = &aic32x4_div_ops,
+ .reg = AIC32X4_NDAC,
+ },
+ {
+ .name = "mdac",
+ .parent_names = (const char * []) { "ndac" },
+ .num_parents = 1,
+ .ops = &aic32x4_div_ops,
+ .reg = AIC32X4_MDAC,
+ },
+ {
+ .name = "nadc",
+ .parent_names = (const char * []) { "codec_clkin" },
+ .num_parents = 1,
+ .ops = &aic32x4_div_ops,
+ .reg = AIC32X4_NADC,
+ },
+ {
+ .name = "madc",
+ .parent_names = (const char * []) { "nadc" },
+ .num_parents = 1,
+ .ops = &aic32x4_div_ops,
+ .reg = AIC32X4_MADC,
+ },
+ {
+ .name = "bdiv",
+ .parent_names =
+ (const char *[]) { "ndac", "mdac", "nadc", "madc" },
+ .num_parents = 4,
+ .ops = &aic32x4_bdiv_ops,
+ .reg = AIC32X4_BCLKN,
+ },
+};
+
+static struct clk *aic32x4_register_clk(struct device *dev,
+ struct aic32x4_clkdesc *desc)
+{
+ struct clk_init_data init;
+ struct clk_aic32x4 *priv;
+ const char *devname = dev_name(dev);
+
+ init.ops = desc->ops;
+ init.name = desc->name;
+ init.parent_names = desc->parent_names;
+ init.num_parents = desc->num_parents;
+ init.flags = 0;
+
+ priv = devm_kzalloc(dev, sizeof(struct clk_aic32x4), GFP_KERNEL);
+ if (priv == NULL)
+ return (struct clk *) -ENOMEM;
+
+ priv->dev = dev;
+ priv->hw.init = &init;
+ priv->regmap = dev_get_regmap(dev, NULL);
+ priv->reg = desc->reg;
+
+ clk_hw_register_clkdev(&priv->hw, desc->name, devname);
+ return devm_clk_register(dev, &priv->hw);
+}
+
+int aic32x4_register_clocks(struct device *dev, const char *mclk_name)
+{
+ int i;
+
+ /*
+ * These lines are here to preserve the current functionality of
+ * the driver with regard to the DT. These should eventually be set
+ * by DT nodes so that the connections can be set up in configuration
+ * rather than code.
+ */
+ aic32x4_clkdesc_array[0].parent_names =
+ (const char* []) { mclk_name, "bclk", "gpio", "din" };
+ aic32x4_clkdesc_array[1].parent_names =
+ (const char *[]) { mclk_name, "bclk", "gpio", "pll" };
+
+ for (i = 0; i < ARRAY_SIZE(aic32x4_clkdesc_array); ++i)
+ aic32x4_register_clk(dev, &aic32x4_clkdesc_array[i]);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(aic32x4_register_clocks);