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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/clk/samsung/clk-exynos-audss.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/clk/samsung/clk-exynos-audss.c | 306 |
1 files changed, 306 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 000000000..9cc127a16 --- /dev/null +++ b/drivers/clk/samsung/clk-exynos-audss.c @@ -0,0 +1,306 @@ +// 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_address.h> +#include <linux/of_device.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 int 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); + + return 0; +} + +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 = 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"); |