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path: root/drivers/clk/mmp/clk-audio.c
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-rw-r--r--drivers/clk/mmp/clk-audio.c445
1 files changed, 445 insertions, 0 deletions
diff --git a/drivers/clk/mmp/clk-audio.c b/drivers/clk/mmp/clk-audio.c
new file mode 100644
index 000000000..7aa7f4a95
--- /dev/null
+++ b/drivers/clk/mmp/clk-audio.c
@@ -0,0 +1,445 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * MMP Audio Clock Controller driver
+ *
+ * Copyright (C) 2020 Lubomir Rintel <lkundrak@v3.sk>
+ */
+
+#include <linux/clk-provider.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_clock.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <dt-bindings/clock/marvell,mmp2-audio.h>
+
+/* Audio Controller Registers */
+#define SSPA_AUD_CTRL 0x04
+#define SSPA_AUD_PLL_CTRL0 0x08
+#define SSPA_AUD_PLL_CTRL1 0x0c
+
+/* SSPA Audio Control Register */
+#define SSPA_AUD_CTRL_SYSCLK_SHIFT 0
+#define SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT 1
+#define SSPA_AUD_CTRL_SSPA0_MUX_SHIFT 7
+#define SSPA_AUD_CTRL_SSPA0_SHIFT 8
+#define SSPA_AUD_CTRL_SSPA0_DIV_SHIFT 9
+#define SSPA_AUD_CTRL_SSPA1_SHIFT 16
+#define SSPA_AUD_CTRL_SSPA1_DIV_SHIFT 17
+#define SSPA_AUD_CTRL_SSPA1_MUX_SHIFT 23
+#define SSPA_AUD_CTRL_DIV_MASK 0x7e
+
+/* SSPA Audio PLL Control 0 Register */
+#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK (0x7 << 28)
+#define SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(x) ((x) << 28)
+#define SSPA_AUD_PLL_CTRL0_FRACT_MASK (0xfffff << 8)
+#define SSPA_AUD_PLL_CTRL0_FRACT(x) ((x) << 8)
+#define SSPA_AUD_PLL_CTRL0_ENA_DITHER (1 << 7)
+#define SSPA_AUD_PLL_CTRL0_ICP_2UA (0 << 5)
+#define SSPA_AUD_PLL_CTRL0_ICP_5UA (1 << 5)
+#define SSPA_AUD_PLL_CTRL0_ICP_7UA (2 << 5)
+#define SSPA_AUD_PLL_CTRL0_ICP_10UA (3 << 5)
+#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK (0x3 << 3)
+#define SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(x) ((x) << 3)
+#define SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK (0x1 << 2)
+#define SSPA_AUD_PLL_CTRL0_DIV_MCLK(x) ((x) << 2)
+#define SSPA_AUD_PLL_CTRL0_PD_OVPROT_DIS (1 << 1)
+#define SSPA_AUD_PLL_CTRL0_PU (1 << 0)
+
+/* SSPA Audio PLL Control 1 Register */
+#define SSPA_AUD_PLL_CTRL1_SEL_FAST_CLK (1 << 24)
+#define SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK (1 << 11)
+#define SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL (1 << 11)
+#define SSPA_AUD_PLL_CTRL1_CLK_SEL_VCXO (0 << 11)
+#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK (0x7ff << 0)
+#define SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(x) ((x) << 0)
+
+struct mmp2_audio_clk {
+ void __iomem *mmio_base;
+
+ struct clk_hw audio_pll_hw;
+ struct clk_mux sspa_mux;
+ struct clk_mux sspa1_mux;
+ struct clk_divider sysclk_div;
+ struct clk_divider sspa0_div;
+ struct clk_divider sspa1_div;
+ struct clk_gate sysclk_gate;
+ struct clk_gate sspa0_gate;
+ struct clk_gate sspa1_gate;
+
+ u32 aud_ctrl;
+ u32 aud_pll_ctrl0;
+ u32 aud_pll_ctrl1;
+
+ spinlock_t lock;
+
+ /* Must be last */
+ struct clk_hw_onecell_data clk_data;
+};
+
+static const struct {
+ unsigned long parent_rate;
+ unsigned long freq_vco;
+ unsigned char mclk;
+ unsigned char fbcclk;
+ unsigned short fract;
+} predivs[] = {
+ { 26000000, 135475200, 0, 0, 0x8a18 },
+ { 26000000, 147456000, 0, 1, 0x0da1 },
+ { 38400000, 135475200, 1, 2, 0x8208 },
+ { 38400000, 147456000, 1, 3, 0xaaaa },
+};
+
+static const struct {
+ unsigned char divisor;
+ unsigned char modulo;
+ unsigned char pattern;
+} postdivs[] = {
+ { 1, 3, 0, },
+ { 2, 5, 0, },
+ { 4, 0, 0, },
+ { 6, 1, 1, },
+ { 8, 1, 0, },
+ { 9, 1, 2, },
+ { 12, 2, 1, },
+ { 16, 2, 0, },
+ { 18, 2, 2, },
+ { 24, 4, 1, },
+ { 36, 4, 2, },
+ { 48, 6, 1, },
+ { 72, 6, 2, },
+};
+
+static unsigned long audio_pll_recalc_rate(struct clk_hw *hw,
+ unsigned long parent_rate)
+{
+ struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
+ unsigned int prediv;
+ unsigned int postdiv;
+ u32 aud_pll_ctrl0;
+ u32 aud_pll_ctrl1;
+
+ aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
+ aud_pll_ctrl0 &= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO_MASK |
+ SSPA_AUD_PLL_CTRL0_FRACT_MASK |
+ SSPA_AUD_PLL_CTRL0_ENA_DITHER |
+ SSPA_AUD_PLL_CTRL0_DIV_FBCCLK_MASK |
+ SSPA_AUD_PLL_CTRL0_DIV_MCLK_MASK |
+ SSPA_AUD_PLL_CTRL0_PU;
+
+ aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
+ aud_pll_ctrl1 &= SSPA_AUD_PLL_CTRL1_CLK_SEL_MASK |
+ SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN_MASK;
+
+ for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
+ if (predivs[prediv].parent_rate != parent_rate)
+ continue;
+ for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
+ unsigned long freq;
+ u32 val;
+
+ val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
+ val |= SSPA_AUD_PLL_CTRL0_PU;
+ val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
+ val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
+ val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
+ val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
+ if (val != aud_pll_ctrl0)
+ continue;
+
+ val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
+ val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
+ if (val != aud_pll_ctrl1)
+ continue;
+
+ freq = predivs[prediv].freq_vco;
+ freq /= postdivs[postdiv].divisor;
+ return freq;
+ }
+ }
+
+ return 0;
+}
+
+static long audio_pll_round_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long *parent_rate)
+{
+ unsigned int prediv;
+ unsigned int postdiv;
+ long rounded = 0;
+
+ for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
+ if (predivs[prediv].parent_rate != *parent_rate)
+ continue;
+ for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
+ long freq = predivs[prediv].freq_vco;
+
+ freq /= postdivs[postdiv].divisor;
+ if (freq == rate)
+ return rate;
+ if (freq < rate)
+ continue;
+ if (rounded && freq > rounded)
+ continue;
+ rounded = freq;
+ }
+ }
+
+ return rounded;
+}
+
+static int audio_pll_set_rate(struct clk_hw *hw, unsigned long rate,
+ unsigned long parent_rate)
+{
+ struct mmp2_audio_clk *priv = container_of(hw, struct mmp2_audio_clk, audio_pll_hw);
+ unsigned int prediv;
+ unsigned int postdiv;
+ unsigned long val;
+
+ for (prediv = 0; prediv < ARRAY_SIZE(predivs); prediv++) {
+ if (predivs[prediv].parent_rate != parent_rate)
+ continue;
+
+ for (postdiv = 0; postdiv < ARRAY_SIZE(postdivs); postdiv++) {
+ if (rate * postdivs[postdiv].divisor != predivs[prediv].freq_vco)
+ continue;
+
+ val = SSPA_AUD_PLL_CTRL0_ENA_DITHER;
+ val |= SSPA_AUD_PLL_CTRL0_PU;
+ val |= SSPA_AUD_PLL_CTRL0_DIV_OCLK_MODULO(postdivs[postdiv].modulo);
+ val |= SSPA_AUD_PLL_CTRL0_FRACT(predivs[prediv].fract);
+ val |= SSPA_AUD_PLL_CTRL0_DIV_FBCCLK(predivs[prediv].fbcclk);
+ val |= SSPA_AUD_PLL_CTRL0_DIV_MCLK(predivs[prediv].mclk);
+ writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
+
+ val = SSPA_AUD_PLL_CTRL1_CLK_SEL_AUDIO_PLL;
+ val |= SSPA_AUD_PLL_CTRL1_DIV_OCLK_PATTERN(postdivs[postdiv].pattern);
+ writel(val, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
+
+ return 0;
+ }
+ }
+
+ return -ERANGE;
+}
+
+static const struct clk_ops audio_pll_ops = {
+ .recalc_rate = audio_pll_recalc_rate,
+ .round_rate = audio_pll_round_rate,
+ .set_rate = audio_pll_set_rate,
+};
+
+static int register_clocks(struct mmp2_audio_clk *priv, struct device *dev)
+{
+ const struct clk_parent_data sspa_mux_parents[] = {
+ { .hw = &priv->audio_pll_hw },
+ { .fw_name = "i2s0" },
+ };
+ const struct clk_parent_data sspa1_mux_parents[] = {
+ { .hw = &priv->audio_pll_hw },
+ { .fw_name = "i2s1" },
+ };
+ int ret;
+
+ priv->audio_pll_hw.init = CLK_HW_INIT_FW_NAME("audio_pll",
+ "vctcxo", &audio_pll_ops,
+ CLK_SET_RATE_PARENT);
+ ret = devm_clk_hw_register(dev, &priv->audio_pll_hw);
+ if (ret)
+ return ret;
+
+ priv->sspa_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa_mux",
+ sspa_mux_parents, &clk_mux_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sspa_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa_mux.mask = 1;
+ priv->sspa_mux.shift = SSPA_AUD_CTRL_SSPA0_MUX_SHIFT;
+ ret = devm_clk_hw_register(dev, &priv->sspa_mux.hw);
+ if (ret)
+ return ret;
+
+ priv->sysclk_div.hw.init = CLK_HW_INIT_HW("sys_div",
+ &priv->sspa_mux.hw, &clk_divider_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sysclk_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sysclk_div.shift = SSPA_AUD_CTRL_SYSCLK_DIV_SHIFT;
+ priv->sysclk_div.width = 6;
+ priv->sysclk_div.flags = CLK_DIVIDER_ONE_BASED;
+ priv->sysclk_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
+ priv->sysclk_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
+ ret = devm_clk_hw_register(dev, &priv->sysclk_div.hw);
+ if (ret)
+ return ret;
+
+ priv->sysclk_gate.hw.init = CLK_HW_INIT_HW("sys_clk",
+ &priv->sysclk_div.hw, &clk_gate_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sysclk_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sysclk_gate.bit_idx = SSPA_AUD_CTRL_SYSCLK_SHIFT;
+ ret = devm_clk_hw_register(dev, &priv->sysclk_gate.hw);
+ if (ret)
+ return ret;
+
+ priv->sspa0_div.hw.init = CLK_HW_INIT_HW("sspa0_div",
+ &priv->sspa_mux.hw, &clk_divider_ops, 0);
+ priv->sspa0_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa0_div.shift = SSPA_AUD_CTRL_SSPA0_DIV_SHIFT;
+ priv->sspa0_div.width = 6;
+ priv->sspa0_div.flags = CLK_DIVIDER_ONE_BASED;
+ priv->sspa0_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
+ priv->sspa0_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
+ ret = devm_clk_hw_register(dev, &priv->sspa0_div.hw);
+ if (ret)
+ return ret;
+
+ priv->sspa0_gate.hw.init = CLK_HW_INIT_HW("sspa0_clk",
+ &priv->sspa0_div.hw, &clk_gate_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sspa0_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa0_gate.bit_idx = SSPA_AUD_CTRL_SSPA0_SHIFT;
+ ret = devm_clk_hw_register(dev, &priv->sspa0_gate.hw);
+ if (ret)
+ return ret;
+
+ priv->sspa1_mux.hw.init = CLK_HW_INIT_PARENTS_DATA("sspa1_mux",
+ sspa1_mux_parents, &clk_mux_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sspa1_mux.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa1_mux.mask = 1;
+ priv->sspa1_mux.shift = SSPA_AUD_CTRL_SSPA1_MUX_SHIFT;
+ ret = devm_clk_hw_register(dev, &priv->sspa1_mux.hw);
+ if (ret)
+ return ret;
+
+ priv->sspa1_div.hw.init = CLK_HW_INIT_HW("sspa1_div",
+ &priv->sspa1_mux.hw, &clk_divider_ops, 0);
+ priv->sspa1_div.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa1_div.shift = SSPA_AUD_CTRL_SSPA1_DIV_SHIFT;
+ priv->sspa1_div.width = 6;
+ priv->sspa1_div.flags = CLK_DIVIDER_ONE_BASED;
+ priv->sspa1_div.flags |= CLK_DIVIDER_ROUND_CLOSEST;
+ priv->sspa1_div.flags |= CLK_DIVIDER_ALLOW_ZERO;
+ ret = devm_clk_hw_register(dev, &priv->sspa1_div.hw);
+ if (ret)
+ return ret;
+
+ priv->sspa1_gate.hw.init = CLK_HW_INIT_HW("sspa1_clk",
+ &priv->sspa1_div.hw, &clk_gate_ops,
+ CLK_SET_RATE_PARENT);
+ priv->sspa1_gate.reg = priv->mmio_base + SSPA_AUD_CTRL;
+ priv->sspa1_gate.bit_idx = SSPA_AUD_CTRL_SSPA1_SHIFT;
+ ret = devm_clk_hw_register(dev, &priv->sspa1_gate.hw);
+ if (ret)
+ return ret;
+
+ priv->clk_data.hws[MMP2_CLK_AUDIO_SYSCLK] = &priv->sysclk_gate.hw;
+ priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA0] = &priv->sspa0_gate.hw;
+ priv->clk_data.hws[MMP2_CLK_AUDIO_SSPA1] = &priv->sspa1_gate.hw;
+ priv->clk_data.num = MMP2_CLK_AUDIO_NR_CLKS;
+
+ return of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
+ &priv->clk_data);
+}
+
+static int mmp2_audio_clk_probe(struct platform_device *pdev)
+{
+ struct mmp2_audio_clk *priv;
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev,
+ struct_size(priv, clk_data.hws,
+ MMP2_CLK_AUDIO_NR_CLKS),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ spin_lock_init(&priv->lock);
+ platform_set_drvdata(pdev, priv);
+
+ priv->mmio_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->mmio_base))
+ return PTR_ERR(priv->mmio_base);
+
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_clk_create(&pdev->dev);
+ if (ret)
+ goto disable_pm_runtime;
+
+ ret = pm_clk_add(&pdev->dev, "audio");
+ if (ret)
+ goto destroy_pm_clk;
+
+ ret = register_clocks(priv, &pdev->dev);
+ if (ret)
+ goto destroy_pm_clk;
+
+ return 0;
+
+destroy_pm_clk:
+ pm_clk_destroy(&pdev->dev);
+disable_pm_runtime:
+ pm_runtime_disable(&pdev->dev);
+
+ return ret;
+}
+
+static int mmp2_audio_clk_remove(struct platform_device *pdev)
+{
+ pm_clk_destroy(&pdev->dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int mmp2_audio_clk_suspend(struct device *dev)
+{
+ struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
+
+ priv->aud_ctrl = readl(priv->mmio_base + SSPA_AUD_CTRL);
+ priv->aud_pll_ctrl0 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL0);
+ priv->aud_pll_ctrl1 = readl(priv->mmio_base + SSPA_AUD_PLL_CTRL1);
+ pm_clk_suspend(dev);
+
+ return 0;
+}
+
+static int mmp2_audio_clk_resume(struct device *dev)
+{
+ struct mmp2_audio_clk *priv = dev_get_drvdata(dev);
+
+ pm_clk_resume(dev);
+ writel(priv->aud_ctrl, priv->mmio_base + SSPA_AUD_CTRL);
+ writel(priv->aud_pll_ctrl0, priv->mmio_base + SSPA_AUD_PLL_CTRL0);
+ writel(priv->aud_pll_ctrl1, priv->mmio_base + SSPA_AUD_PLL_CTRL1);
+
+ return 0;
+}
+#endif
+
+static const struct dev_pm_ops mmp2_audio_clk_pm_ops = {
+ SET_RUNTIME_PM_OPS(mmp2_audio_clk_suspend, mmp2_audio_clk_resume, NULL)
+};
+
+static const struct of_device_id mmp2_audio_clk_of_match[] = {
+ { .compatible = "marvell,mmp2-audio-clock" },
+ {}
+};
+
+MODULE_DEVICE_TABLE(of, mmp2_audio_clk_of_match);
+
+static struct platform_driver mmp2_audio_clk_driver = {
+ .driver = {
+ .name = "mmp2-audio-clock",
+ .of_match_table = of_match_ptr(mmp2_audio_clk_of_match),
+ .pm = &mmp2_audio_clk_pm_ops,
+ },
+ .probe = mmp2_audio_clk_probe,
+ .remove = mmp2_audio_clk_remove,
+};
+module_platform_driver(mmp2_audio_clk_driver);
+
+MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
+MODULE_DESCRIPTION("Clock driver for MMP2 Audio subsystem");
+MODULE_LICENSE("GPL");
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-07 02:11:28 +0000