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![Stephen Boyd](/assets/img/avatar_default.png)
A future patch is going to change semantics of clk_register() so that clk_hw::init is guaranteed to be NULL after a clk is registered. Avoid referencing this member here so that we don't run into NULL pointer exceptions. Cc: Charles Keepax <ckeepax@opensource.cirrus.com> Cc: Richard Fitzgerald <rf@opensource.cirrus.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org> Link: https://lkml.kernel.org/r/20190731193517.237136-3-sboyd@kernel.org Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
303 lines
7.7 KiB
C
303 lines
7.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Lochnagar clock control
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*
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* Copyright (c) 2017-2018 Cirrus Logic, Inc. and
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* Cirrus Logic International Semiconductor Ltd.
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*
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* Author: Charles Keepax <ckeepax@opensource.cirrus.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/lochnagar1_regs.h>
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#include <linux/mfd/lochnagar2_regs.h>
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#include <dt-bindings/clk/lochnagar.h>
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#define LOCHNAGAR_NUM_CLOCKS (LOCHNAGAR_SPDIF_CLKOUT + 1)
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struct lochnagar_clk {
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const char * const name;
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struct clk_hw hw;
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struct lochnagar_clk_priv *priv;
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u16 cfg_reg;
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u16 ena_mask;
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u16 src_reg;
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u16 src_mask;
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};
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struct lochnagar_clk_priv {
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struct device *dev;
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struct regmap *regmap;
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struct lochnagar_clk lclks[LOCHNAGAR_NUM_CLOCKS];
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};
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#define LN_PARENT(NAME) { .name = NAME, .fw_name = NAME }
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static const struct clk_parent_data lochnagar1_clk_parents[] = {
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LN_PARENT("ln-none"),
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LN_PARENT("ln-spdif-mclk"),
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LN_PARENT("ln-psia1-mclk"),
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LN_PARENT("ln-psia2-mclk"),
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LN_PARENT("ln-cdc-clkout"),
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LN_PARENT("ln-dsp-clkout"),
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LN_PARENT("ln-pmic-32k"),
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LN_PARENT("ln-gf-mclk1"),
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LN_PARENT("ln-gf-mclk3"),
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LN_PARENT("ln-gf-mclk2"),
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LN_PARENT("ln-gf-mclk4"),
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};
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static const struct clk_parent_data lochnagar2_clk_parents[] = {
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LN_PARENT("ln-none"),
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LN_PARENT("ln-cdc-clkout"),
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LN_PARENT("ln-dsp-clkout"),
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LN_PARENT("ln-pmic-32k"),
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LN_PARENT("ln-spdif-mclk"),
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LN_PARENT("ln-clk-12m"),
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LN_PARENT("ln-clk-11m"),
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LN_PARENT("ln-clk-24m"),
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LN_PARENT("ln-clk-22m"),
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LN_PARENT("ln-clk-8m"),
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LN_PARENT("ln-usb-clk-24m"),
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LN_PARENT("ln-gf-mclk1"),
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LN_PARENT("ln-gf-mclk3"),
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LN_PARENT("ln-gf-mclk2"),
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LN_PARENT("ln-psia1-mclk"),
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LN_PARENT("ln-psia2-mclk"),
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LN_PARENT("ln-spdif-clkout"),
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LN_PARENT("ln-adat-mclk"),
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LN_PARENT("ln-usb-clk-12m"),
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};
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#define LN1_CLK(ID, NAME, REG) \
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[LOCHNAGAR_##ID] = { \
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.name = NAME, \
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.cfg_reg = LOCHNAGAR1_##REG, \
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.ena_mask = LOCHNAGAR1_##ID##_ENA_MASK, \
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.src_reg = LOCHNAGAR1_##ID##_SEL, \
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.src_mask = LOCHNAGAR1_SRC_MASK, \
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}
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#define LN2_CLK(ID, NAME) \
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[LOCHNAGAR_##ID] = { \
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.name = NAME, \
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.cfg_reg = LOCHNAGAR2_##ID##_CTRL, \
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.src_reg = LOCHNAGAR2_##ID##_CTRL, \
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.ena_mask = LOCHNAGAR2_CLK_ENA_MASK, \
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.src_mask = LOCHNAGAR2_CLK_SRC_MASK, \
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}
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static const struct lochnagar_clk lochnagar1_clks[LOCHNAGAR_NUM_CLOCKS] = {
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LN1_CLK(CDC_MCLK1, "ln-cdc-mclk1", CDC_AIF_CTRL2),
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LN1_CLK(CDC_MCLK2, "ln-cdc-mclk2", CDC_AIF_CTRL2),
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LN1_CLK(DSP_CLKIN, "ln-dsp-clkin", DSP_AIF),
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LN1_CLK(GF_CLKOUT1, "ln-gf-clkout1", GF_AIF1),
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};
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static const struct lochnagar_clk lochnagar2_clks[LOCHNAGAR_NUM_CLOCKS] = {
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LN2_CLK(CDC_MCLK1, "ln-cdc-mclk1"),
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LN2_CLK(CDC_MCLK2, "ln-cdc-mclk2"),
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LN2_CLK(DSP_CLKIN, "ln-dsp-clkin"),
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LN2_CLK(GF_CLKOUT1, "ln-gf-clkout1"),
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LN2_CLK(GF_CLKOUT2, "ln-gf-clkout2"),
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LN2_CLK(PSIA1_MCLK, "ln-psia1-mclk"),
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LN2_CLK(PSIA2_MCLK, "ln-psia2-mclk"),
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LN2_CLK(SPDIF_MCLK, "ln-spdif-mclk"),
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LN2_CLK(ADAT_MCLK, "ln-adat-mclk"),
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LN2_CLK(SOUNDCARD_MCLK, "ln-soundcard-mclk"),
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};
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struct lochnagar_config {
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const struct clk_parent_data *parents;
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int nparents;
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const struct lochnagar_clk *clks;
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};
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static const struct lochnagar_config lochnagar1_conf = {
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.parents = lochnagar1_clk_parents,
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.nparents = ARRAY_SIZE(lochnagar1_clk_parents),
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.clks = lochnagar1_clks,
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};
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static const struct lochnagar_config lochnagar2_conf = {
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.parents = lochnagar2_clk_parents,
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.nparents = ARRAY_SIZE(lochnagar2_clk_parents),
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.clks = lochnagar2_clks,
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};
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static inline struct lochnagar_clk *lochnagar_hw_to_lclk(struct clk_hw *hw)
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{
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return container_of(hw, struct lochnagar_clk, hw);
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}
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static int lochnagar_clk_prepare(struct clk_hw *hw)
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{
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struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
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struct lochnagar_clk_priv *priv = lclk->priv;
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struct regmap *regmap = priv->regmap;
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int ret;
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ret = regmap_update_bits(regmap, lclk->cfg_reg,
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lclk->ena_mask, lclk->ena_mask);
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if (ret < 0)
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dev_dbg(priv->dev, "Failed to prepare %s: %d\n",
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lclk->name, ret);
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return ret;
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}
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static void lochnagar_clk_unprepare(struct clk_hw *hw)
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{
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struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
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struct lochnagar_clk_priv *priv = lclk->priv;
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struct regmap *regmap = priv->regmap;
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int ret;
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ret = regmap_update_bits(regmap, lclk->cfg_reg, lclk->ena_mask, 0);
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if (ret < 0)
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dev_dbg(priv->dev, "Failed to unprepare %s: %d\n",
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lclk->name, ret);
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}
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static int lochnagar_clk_set_parent(struct clk_hw *hw, u8 index)
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{
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struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
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struct lochnagar_clk_priv *priv = lclk->priv;
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struct regmap *regmap = priv->regmap;
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int ret;
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ret = regmap_update_bits(regmap, lclk->src_reg, lclk->src_mask, index);
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if (ret < 0)
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dev_dbg(priv->dev, "Failed to reparent %s: %d\n",
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lclk->name, ret);
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return ret;
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}
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static u8 lochnagar_clk_get_parent(struct clk_hw *hw)
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{
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struct lochnagar_clk *lclk = lochnagar_hw_to_lclk(hw);
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struct lochnagar_clk_priv *priv = lclk->priv;
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struct regmap *regmap = priv->regmap;
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unsigned int val;
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int ret;
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ret = regmap_read(regmap, lclk->src_reg, &val);
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if (ret < 0) {
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dev_dbg(priv->dev, "Failed to read parent of %s: %d\n",
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lclk->name, ret);
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return clk_hw_get_num_parents(hw);
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}
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val &= lclk->src_mask;
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return val;
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}
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static const struct clk_ops lochnagar_clk_ops = {
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.prepare = lochnagar_clk_prepare,
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.unprepare = lochnagar_clk_unprepare,
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.set_parent = lochnagar_clk_set_parent,
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.get_parent = lochnagar_clk_get_parent,
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};
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static struct clk_hw *
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lochnagar_of_clk_hw_get(struct of_phandle_args *clkspec, void *data)
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{
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struct lochnagar_clk_priv *priv = data;
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unsigned int idx = clkspec->args[0];
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if (idx >= ARRAY_SIZE(priv->lclks)) {
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dev_err(priv->dev, "Invalid index %u\n", idx);
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return ERR_PTR(-EINVAL);
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}
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return &priv->lclks[idx].hw;
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}
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static const struct of_device_id lochnagar_of_match[] = {
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{ .compatible = "cirrus,lochnagar1-clk", .data = &lochnagar1_conf },
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{ .compatible = "cirrus,lochnagar2-clk", .data = &lochnagar2_conf },
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{}
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};
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MODULE_DEVICE_TABLE(of, lochnagar_of_match);
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static int lochnagar_clk_probe(struct platform_device *pdev)
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{
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struct clk_init_data clk_init = {
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.ops = &lochnagar_clk_ops,
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};
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struct device *dev = &pdev->dev;
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struct lochnagar_clk_priv *priv;
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const struct of_device_id *of_id;
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struct lochnagar_clk *lclk;
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struct lochnagar_config *conf;
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int ret, i;
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of_id = of_match_device(lochnagar_of_match, dev);
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if (!of_id)
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return -EINVAL;
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priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->dev = dev;
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priv->regmap = dev_get_regmap(dev->parent, NULL);
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conf = (struct lochnagar_config *)of_id->data;
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memcpy(priv->lclks, conf->clks, sizeof(priv->lclks));
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clk_init.parent_data = conf->parents;
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clk_init.num_parents = conf->nparents;
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for (i = 0; i < ARRAY_SIZE(priv->lclks); i++) {
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lclk = &priv->lclks[i];
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if (!lclk->name)
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continue;
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clk_init.name = lclk->name;
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lclk->priv = priv;
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lclk->hw.init = &clk_init;
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ret = devm_clk_hw_register(dev, &lclk->hw);
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if (ret) {
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dev_err(dev, "Failed to register %s: %d\n",
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lclk->name, ret);
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return ret;
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}
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}
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ret = devm_of_clk_add_hw_provider(dev, lochnagar_of_clk_hw_get, priv);
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if (ret < 0)
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dev_err(dev, "Failed to register provider: %d\n", ret);
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return ret;
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}
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static struct platform_driver lochnagar_clk_driver = {
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.driver = {
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.name = "lochnagar-clk",
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.of_match_table = lochnagar_of_match,
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},
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.probe = lochnagar_clk_probe,
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};
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module_platform_driver(lochnagar_clk_driver);
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MODULE_AUTHOR("Charles Keepax <ckeepax@opensource.cirrus.com>");
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MODULE_DESCRIPTION("Clock driver for Cirrus Logic Lochnagar Board");
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MODULE_LICENSE("GPL v2");
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