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1241ef94cc
Audio subsystem is introduced in s5pv210 and exynos platforms. This has seperate clock controller which can control i2s0 and pcm0 clocks. This patch registers the audio subsystem clocks with the common clock framework on Exynos family. Signed-off-by: Padmavathi Venna <padma.v@samsung.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Reviewed-by: Doug Anderson <dianders@chromium.org> Acked-by: Mike Turquette <mturquette@linaro.org> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
134 lines
3.8 KiB
C
134 lines
3.8 KiB
C
/*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* Author: Padmavathi Venna <padma.v@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Common Clock Framework support for Audio Subsystem Clock Controller.
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*/
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#include <linux/clkdev.h>
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#include <linux/io.h>
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#include <linux/clk-provider.h>
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#include <linux/of_address.h>
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#include <linux/syscore_ops.h>
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#include <dt-bindings/clk/exynos-audss-clk.h>
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static DEFINE_SPINLOCK(lock);
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static struct clk **clk_table;
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static void __iomem *reg_base;
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static struct clk_onecell_data clk_data;
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#define ASS_CLK_SRC 0x0
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#define ASS_CLK_DIV 0x4
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#define ASS_CLK_GATE 0x8
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static unsigned long reg_save[][2] = {
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{ASS_CLK_SRC, 0},
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{ASS_CLK_DIV, 0},
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{ASS_CLK_GATE, 0},
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};
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/* list of all parent clock list */
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static const char *mout_audss_p[] = { "fin_pll", "fout_epll" };
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static const char *mout_i2s_p[] = { "mout_audss", "cdclk0", "sclk_audio0" };
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#ifdef CONFIG_PM_SLEEP
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static int exynos_audss_clk_suspend(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(reg_save); i++)
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reg_save[i][1] = readl(reg_base + reg_save[i][0]);
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return 0;
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}
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static void exynos_audss_clk_resume(void)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(reg_save); i++)
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writel(reg_save[i][1], reg_base + reg_save[i][0]);
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}
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static struct syscore_ops exynos_audss_clk_syscore_ops = {
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.suspend = exynos_audss_clk_suspend,
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.resume = exynos_audss_clk_resume,
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};
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#endif /* CONFIG_PM_SLEEP */
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/* register exynos_audss clocks */
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void __init exynos_audss_clk_init(struct device_node *np)
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{
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reg_base = of_iomap(np, 0);
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if (!reg_base) {
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pr_err("%s: failed to map audss registers\n", __func__);
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return;
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}
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clk_table = kzalloc(sizeof(struct clk *) * EXYNOS_AUDSS_MAX_CLKS,
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GFP_KERNEL);
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if (!clk_table) {
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pr_err("%s: could not allocate clk lookup table\n", __func__);
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return;
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}
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clk_data.clks = clk_table;
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clk_data.clk_num = EXYNOS_AUDSS_MAX_CLKS;
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of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
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clk_table[EXYNOS_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss",
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mout_audss_p, ARRAY_SIZE(mout_audss_p), 0,
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reg_base + ASS_CLK_SRC, 0, 1, 0, &lock);
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clk_table[EXYNOS_MOUT_I2S] = clk_register_mux(NULL, "mout_i2s",
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mout_i2s_p, ARRAY_SIZE(mout_i2s_p), 0,
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reg_base + ASS_CLK_SRC, 2, 2, 0, &lock);
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clk_table[EXYNOS_DOUT_SRP] = clk_register_divider(NULL, "dout_srp",
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"mout_audss", 0, reg_base + ASS_CLK_DIV, 0, 4,
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0, &lock);
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clk_table[EXYNOS_DOUT_AUD_BUS] = clk_register_divider(NULL,
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"dout_aud_bus", "dout_srp", 0,
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reg_base + ASS_CLK_DIV, 4, 4, 0, &lock);
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clk_table[EXYNOS_DOUT_I2S] = clk_register_divider(NULL, "dout_i2s",
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"mout_i2s", 0, reg_base + ASS_CLK_DIV, 8, 4, 0,
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&lock);
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clk_table[EXYNOS_SRP_CLK] = clk_register_gate(NULL, "srp_clk",
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"dout_srp", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 0, 0, &lock);
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clk_table[EXYNOS_I2S_BUS] = clk_register_gate(NULL, "i2s_bus",
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"dout_aud_bus", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 2, 0, &lock);
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clk_table[EXYNOS_SCLK_I2S] = clk_register_gate(NULL, "sclk_i2s",
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"dout_i2s", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 3, 0, &lock);
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clk_table[EXYNOS_PCM_BUS] = clk_register_gate(NULL, "pcm_bus",
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"sclk_pcm", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 4, 0, &lock);
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clk_table[EXYNOS_SCLK_PCM] = clk_register_gate(NULL, "sclk_pcm",
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"div_pcm0", CLK_SET_RATE_PARENT,
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reg_base + ASS_CLK_GATE, 5, 0, &lock);
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#ifdef CONFIG_PM_SLEEP
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register_syscore_ops(&exynos_audss_clk_syscore_ops);
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#endif
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pr_info("Exynos: Audss: clock setup completed\n");
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}
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CLK_OF_DECLARE(exynos4210_audss_clk, "samsung,exynos4210-audss-clock",
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exynos_audss_clk_init);
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CLK_OF_DECLARE(exynos5250_audss_clk, "samsung,exynos5250-audss-clock",
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exynos_audss_clk_init);
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