1 files changed, 303 insertions, 0 deletions
diff --git a/drivers/clk/samsung/clk-exynos-audss.c b/drivers/clk/samsung/clk-exynos-audss.c
new file mode 100644
index 0000000000..e44b172d72
--- /dev/null
+++ b/drivers/clk/samsung/clk-exynos-audss.c
@@ -0,0 +1,303 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2013 Samsung Electronics Co., Ltd.
+ * Author: Padmavathi Venna <padma.v@samsung.com>
+ *
+ * Common Clock Framework support for Audio Subsystem Clock Controller.
+*/
+
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/clk-provider.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+
+#include <dt-bindings/clock/exynos-audss-clk.h>
+
+static DEFINE_SPINLOCK(lock);
+static void __iomem *reg_base;
+static struct clk_hw_onecell_data *clk_data;
+/*
+ * On Exynos5420 this will be a clock which has to be enabled before any
+ * access to audss registers. Typically a child of EPLL.
+ *
+ * On other platforms this will be -ENODEV.
+ */
+static struct clk *epll;
+
+#define ASS_CLK_SRC 0x0
+#define ASS_CLK_DIV 0x4
+#define ASS_CLK_GATE 0x8
+
+static unsigned long reg_save[][2] = {
+	{ ASS_CLK_SRC,  0 },
+	{ ASS_CLK_DIV,  0 },
+	{ ASS_CLK_GATE, 0 },
+};
+
+static int __maybe_unused exynos_audss_clk_suspend(struct device *dev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(reg_save); i++)
+		reg_save[i][1] = readl(reg_base + reg_save[i][0]);
+
+	return 0;
+}
+
+static int __maybe_unused exynos_audss_clk_resume(struct device *dev)
+{
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(reg_save); i++)
+		writel(reg_save[i][1], reg_base + reg_save[i][0]);
+
+	return 0;
+}
+
+struct exynos_audss_clk_drvdata {
+	unsigned int has_adma_clk:1;
+	unsigned int has_mst_clk:1;
+	unsigned int enable_epll:1;
+	unsigned int num_clks;
+};
+
+static const struct exynos_audss_clk_drvdata exynos4210_drvdata = {
+	.num_clks	= EXYNOS_AUDSS_MAX_CLKS - 1,
+	.enable_epll	= 1,
+};
+
+static const struct exynos_audss_clk_drvdata exynos5410_drvdata = {
+	.num_clks	= EXYNOS_AUDSS_MAX_CLKS - 1,
+	.has_mst_clk	= 1,
+};
+
+static const struct exynos_audss_clk_drvdata exynos5420_drvdata = {
+	.num_clks	= EXYNOS_AUDSS_MAX_CLKS,
+	.has_adma_clk	= 1,
+	.enable_epll	= 1,
+};
+
+static const struct of_device_id exynos_audss_clk_of_match[] = {
+	{
+		.compatible	= "samsung,exynos4210-audss-clock",
+		.data		= &exynos4210_drvdata,
+	}, {
+		.compatible	= "samsung,exynos5250-audss-clock",
+		.data		= &exynos4210_drvdata,
+	}, {
+		.compatible	= "samsung,exynos5410-audss-clock",
+		.data		= &exynos5410_drvdata,
+	}, {
+		.compatible	= "samsung,exynos5420-audss-clock",
+		.data		= &exynos5420_drvdata,
+	},
+	{ },
+};
+MODULE_DEVICE_TABLE(of, exynos_audss_clk_of_match);
+
+static void exynos_audss_clk_teardown(void)
+{
+	int i;
+
+	for (i = EXYNOS_MOUT_AUDSS; i < EXYNOS_DOUT_SRP; i++) {
+		if (!IS_ERR(clk_data->hws[i]))
+			clk_hw_unregister_mux(clk_data->hws[i]);
+	}
+
+	for (; i < EXYNOS_SRP_CLK; i++) {
+		if (!IS_ERR(clk_data->hws[i]))
+			clk_hw_unregister_divider(clk_data->hws[i]);
+	}
+
+	for (; i < clk_data->num; i++) {
+		if (!IS_ERR(clk_data->hws[i]))
+			clk_hw_unregister_gate(clk_data->hws[i]);
+	}
+}
+
+/* register exynos_audss clocks */
+static int exynos_audss_clk_probe(struct platform_device *pdev)
+{
+	const char *mout_audss_p[] = {"fin_pll", "fout_epll"};
+	const char *mout_i2s_p[] = {"mout_audss", "cdclk0", "sclk_audio0"};
+	const char *sclk_pcm_p = "sclk_pcm0";
+	struct clk *pll_ref, *pll_in, *cdclk, *sclk_audio, *sclk_pcm_in;
+	const struct exynos_audss_clk_drvdata *variant;
+	struct clk_hw **clk_table;
+	struct device *dev = &pdev->dev;
+	int i, ret = 0;
+
+	variant = of_device_get_match_data(&pdev->dev);
+	if (!variant)
+		return -EINVAL;
+
+	reg_base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(reg_base))
+		return PTR_ERR(reg_base);
+
+	epll = ERR_PTR(-ENODEV);
+
+	clk_data = devm_kzalloc(dev,
+				struct_size(clk_data, hws,
+					    EXYNOS_AUDSS_MAX_CLKS),
+				GFP_KERNEL);
+	if (!clk_data)
+		return -ENOMEM;
+
+	clk_data->num = variant->num_clks;
+	clk_table = clk_data->hws;
+
+	pll_ref = devm_clk_get(dev, "pll_ref");
+	pll_in = devm_clk_get(dev, "pll_in");
+	if (!IS_ERR(pll_ref))
+		mout_audss_p[0] = __clk_get_name(pll_ref);
+	if (!IS_ERR(pll_in)) {
+		mout_audss_p[1] = __clk_get_name(pll_in);
+
+		if (variant->enable_epll) {
+			epll = pll_in;
+
+			ret = clk_prepare_enable(epll);
+			if (ret) {
+				dev_err(dev,
+					"failed to prepare the epll clock\n");
+				return ret;
+			}
+		}
+	}
+
+	/*
+	 * Enable runtime PM here to allow the clock core using runtime PM
+	 * for the registered clocks. Additionally, we increase the runtime
+	 * PM usage count before registering the clocks, to prevent the
+	 * clock core from runtime suspending the device.
+	 */
+	pm_runtime_get_noresume(dev);
+	pm_runtime_set_active(dev);
+	pm_runtime_enable(dev);
+
+	clk_table[EXYNOS_MOUT_AUDSS] = clk_hw_register_mux(dev, "mout_audss",
+				mout_audss_p, ARRAY_SIZE(mout_audss_p),
+				CLK_SET_RATE_NO_REPARENT | CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
+
+	cdclk = devm_clk_get(dev, "cdclk");
+	sclk_audio = devm_clk_get(dev, "sclk_audio");
+	if (!IS_ERR(cdclk))
+		mout_i2s_p[1] = __clk_get_name(cdclk);
+	if (!IS_ERR(sclk_audio))
+		mout_i2s_p[2] = __clk_get_name(sclk_audio);
+	clk_table[EXYNOS_MOUT_I2S] = clk_hw_register_mux(dev, "mout_i2s",
+				mout_i2s_p, ARRAY_SIZE(mout_i2s_p),
+				CLK_SET_RATE_NO_REPARENT,
+				reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
+
+	clk_table[EXYNOS_DOUT_SRP] = clk_hw_register_divider(dev, "dout_srp",
+				"mout_audss", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_DIV, 0, 4, 0, &lock);
+
+	clk_table[EXYNOS_DOUT_AUD_BUS] = clk_hw_register_divider(dev,
+				"dout_aud_bus", "dout_srp", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_DIV, 4, 4, 0, &lock);
+
+	clk_table[EXYNOS_DOUT_I2S] = clk_hw_register_divider(dev, "dout_i2s",
+				"mout_i2s", 0, reg_base + ASS_CLK_DIV, 8, 4, 0,
+				&lock);
+
+	clk_table[EXYNOS_SRP_CLK] = clk_hw_register_gate(dev, "srp_clk",
+				"dout_srp", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 0, 0, &lock);
+
+	clk_table[EXYNOS_I2S_BUS] = clk_hw_register_gate(dev, "i2s_bus",
+				"dout_aud_bus", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 2, 0, &lock);
+
+	clk_table[EXYNOS_SCLK_I2S] = clk_hw_register_gate(dev, "sclk_i2s",
+				"dout_i2s", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 3, 0, &lock);
+
+	clk_table[EXYNOS_PCM_BUS] = clk_hw_register_gate(dev, "pcm_bus",
+				 "sclk_pcm", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 4, 0, &lock);
+
+	sclk_pcm_in = devm_clk_get(dev, "sclk_pcm_in");
+	if (!IS_ERR(sclk_pcm_in))
+		sclk_pcm_p = __clk_get_name(sclk_pcm_in);
+	clk_table[EXYNOS_SCLK_PCM] = clk_hw_register_gate(dev, "sclk_pcm",
+				sclk_pcm_p, CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 5, 0, &lock);
+
+	if (variant->has_adma_clk) {
+		clk_table[EXYNOS_ADMA] = clk_hw_register_gate(dev, "adma",
+				"dout_srp", CLK_SET_RATE_PARENT,
+				reg_base + ASS_CLK_GATE, 9, 0, &lock);
+	}
+
+	for (i = 0; i < clk_data->num; i++) {
+		if (IS_ERR(clk_table[i])) {
+			dev_err(dev, "failed to register clock %d\n", i);
+			ret = PTR_ERR(clk_table[i]);
+			goto unregister;
+		}
+	}
+
+	ret = of_clk_add_hw_provider(dev->of_node, of_clk_hw_onecell_get,
+				     clk_data);
+	if (ret) {
+		dev_err(dev, "failed to add clock provider\n");
+		goto unregister;
+	}
+
+	pm_runtime_put_sync(dev);
+
+	return 0;
+
+unregister:
+	exynos_audss_clk_teardown();
+	pm_runtime_put_sync(dev);
+	pm_runtime_disable(dev);
+
+	if (!IS_ERR(epll))
+		clk_disable_unprepare(epll);
+
+	return ret;
+}
+
+static void exynos_audss_clk_remove(struct platform_device *pdev)
+{
+	of_clk_del_provider(pdev->dev.of_node);
+
+	exynos_audss_clk_teardown();
+	pm_runtime_disable(&pdev->dev);
+
+	if (!IS_ERR(epll))
+		clk_disable_unprepare(epll);
+}
+
+static const struct dev_pm_ops exynos_audss_clk_pm_ops = {
+	SET_RUNTIME_PM_OPS(exynos_audss_clk_suspend, exynos_audss_clk_resume,
+			   NULL)
+	SET_LATE_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				     pm_runtime_force_resume)
+};
+
+static struct platform_driver exynos_audss_clk_driver = {
+	.driver	= {
+		.name = "exynos-audss-clk",
+		.of_match_table = exynos_audss_clk_of_match,
+		.pm = &exynos_audss_clk_pm_ops,
+	},
+	.probe = exynos_audss_clk_probe,
+	.remove_new = exynos_audss_clk_remove,
+};
+
+module_platform_driver(exynos_audss_clk_driver);
+
+MODULE_AUTHOR("Padmavathi Venna <padma.v@samsung.com>");
+MODULE_DESCRIPTION("Exynos Audio Subsystem Clock Controller");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:exynos-audss-clk");