projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1241ef94 PV |
1 | /* |
| 2 | * Copyright (c) 2013 Samsung Electronics Co., Ltd. | |
| 3 | * Author: Padmavathi Venna <padma.v@samsung.com> | |
| 4 | * | |
| 5 | * This program is free software; you can redistribute it and/or modify | |
| 6 | * it under the terms of the GNU General Public License version 2 as | |
| 7 | * published by the Free Software Foundation. | |
| 8 | * | |
| 9 | * Common Clock Framework support for Audio Subsystem Clock Controller. | |
| 10 | */ | |
| 11 | ||
| 12 | #include <linux/clkdev.h> | |
| 13 | #include <linux/io.h> | |
| 14 | #include <linux/clk-provider.h> | |
| 15 | #include <linux/of_address.h> | |
| 16 | #include <linux/syscore_ops.h> | |
| 17 | ||
| 18 | #include <dt-bindings/clk/exynos-audss-clk.h> | |
| 19 | ||
| 20 | static DEFINE_SPINLOCK(lock); | |
| 21 | static struct clk **clk_table; | |
| 22 | static void __iomem *reg_base; | |
| 23 | static struct clk_onecell_data clk_data; | |
| 24 | ||
| 25 | #define ASS_CLK_SRC 0x0 | |
| 26 | #define ASS_CLK_DIV 0x4 | |
| 27 | #define ASS_CLK_GATE 0x8 | |
| 28 | ||
| 29 | static unsigned long reg_save[][2] = { | |
| 30 | {ASS_CLK_SRC, 0}, | |
| 31 | {ASS_CLK_DIV, 0}, | |
| 32 | {ASS_CLK_GATE, 0}, | |
| 33 | }; | |
| 34 | ||
| 35 | /* list of all parent clock list */ | |
| 36 | static const char *mout_audss_p[] = { "fin_pll", "fout_epll" }; | |
| 37 | static const char *mout_i2s_p[] = { "mout_audss", "cdclk0", "sclk_audio0" }; | |
| 38 | ||
| 39 | #ifdef CONFIG_PM_SLEEP | |
| 40 | static int exynos_audss_clk_suspend(void) | |
| 41 | { | |
| 42 | int i; | |
| 43 | ||
| 44 | for (i = 0; i < ARRAY_SIZE(reg_save); i++) | |
| 45 | reg_save[i][1] = readl(reg_base + reg_save[i][0]); | |
| 46 | ||
| 47 | return 0; | |
| 48 | } | |
| 49 | ||
| 50 | static void exynos_audss_clk_resume(void) | |
| 51 | { | |
| 52 | int i; | |
| 53 | ||
| 54 | for (i = 0; i < ARRAY_SIZE(reg_save); i++) | |
| 55 | writel(reg_save[i][1], reg_base + reg_save[i][0]); | |
| 56 | } | |
| 57 | ||
| 58 | static struct syscore_ops exynos_audss_clk_syscore_ops = { | |
| 59 | .suspend = exynos_audss_clk_suspend, | |
| 60 | .resume = exynos_audss_clk_resume, | |
| 61 | }; | |
| 62 | #endif /* CONFIG_PM_SLEEP */ | |
| 63 | ||
| 64 | /* register exynos_audss clocks */ | |
| 65 | void __init exynos_audss_clk_init(struct device_node *np) | |
| 66 | { | |
| 67 | reg_base = of_iomap(np, 0); | |
| 68 | if (!reg_base) { | |
| 69 | pr_err("%s: failed to map audss registers\n", __func__); | |
| 70 | return; | |
| 71 | } | |
| 72 | ||
| 73 | clk_table = kzalloc(sizeof(struct clk *) * EXYNOS_AUDSS_MAX_CLKS, | |
| 74 | GFP_KERNEL); | |
| 75 | if (!clk_table) { | |
| 76 | pr_err("%s: could not allocate clk lookup table\n", __func__); | |
| 77 | return; | |
| 78 | } | |
| 79 | ||
| 80 | clk_data.clks = clk_table; | |
| 81 | clk_data.clk_num = EXYNOS_AUDSS_MAX_CLKS; | |
| 82 | of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data); | |
| 83 | ||
| 84 | clk_table[EXYNOS_MOUT_AUDSS] = clk_register_mux(NULL, "mout_audss", | |
| 85 | mout_audss_p, ARRAY_SIZE(mout_audss_p), 0, | |
| 86 | reg_base + ASS_CLK_SRC, 0, 1, 0, &lock); | |
| 87 | ||
| 88 | clk_table[EXYNOS_MOUT_I2S] = clk_register_mux(NULL, "mout_i2s", | |
| 89 | mout_i2s_p, ARRAY_SIZE(mout_i2s_p), 0, | |
| 90 | reg_base + ASS_CLK_SRC, 2, 2, 0, &lock); | |
| 91 | ||
| 92 | clk_table[EXYNOS_DOUT_SRP] = clk_register_divider(NULL, "dout_srp", | |
| 93 | "mout_audss", 0, reg_base + ASS_CLK_DIV, 0, 4, | |
| 94 | 0, &lock); | |
| 95 | ||
| 96 | clk_table[EXYNOS_DOUT_AUD_BUS] = clk_register_divider(NULL, | |
| 97 | "dout_aud_bus", "dout_srp", 0, | |
| 98 | reg_base + ASS_CLK_DIV, 4, 4, 0, &lock); | |
| 99 | ||
| 100 | clk_table[EXYNOS_DOUT_I2S] = clk_register_divider(NULL, "dout_i2s", | |
| 101 | "mout_i2s", 0, reg_base + ASS_CLK_DIV, 8, 4, 0, | |
| 102 | &lock); | |
| 103 | ||
| 104 | clk_table[EXYNOS_SRP_CLK] = clk_register_gate(NULL, "srp_clk", | |
| 105 | "dout_srp", CLK_SET_RATE_PARENT, | |
| 106 | reg_base + ASS_CLK_GATE, 0, 0, &lock); | |
| 107 | ||
| 108 | clk_table[EXYNOS_I2S_BUS] = clk_register_gate(NULL, "i2s_bus", | |
| 109 | "dout_aud_bus", CLK_SET_RATE_PARENT, | |
| 110 | reg_base + ASS_CLK_GATE, 2, 0, &lock); | |
| 111 | ||
| 112 | clk_table[EXYNOS_SCLK_I2S] = clk_register_gate(NULL, "sclk_i2s", | |
| 113 | "dout_i2s", CLK_SET_RATE_PARENT, | |
| 114 | reg_base + ASS_CLK_GATE, 3, 0, &lock); | |
| 115 | ||
| 116 | clk_table[EXYNOS_PCM_BUS] = clk_register_gate(NULL, "pcm_bus", | |
| 117 | "sclk_pcm", CLK_SET_RATE_PARENT, | |
| 118 | reg_base + ASS_CLK_GATE, 4, 0, &lock); | |
| 119 | ||
| 120 | clk_table[EXYNOS_SCLK_PCM] = clk_register_gate(NULL, "sclk_pcm", | |
| 121 | "div_pcm0", CLK_SET_RATE_PARENT, | |
| 122 | reg_base + ASS_CLK_GATE, 5, 0, &lock); | |
| 123 | ||
| 124 | #ifdef CONFIG_PM_SLEEP | |
| 125 | register_syscore_ops(&exynos_audss_clk_syscore_ops); | |
| 126 | #endif | |
| 127 | ||
| 128 | pr_info("Exynos: Audss: clock setup completed\n"); | |
| 129 | } | |
| 130 | CLK_OF_DECLARE(exynos4210_audss_clk, "samsung,exynos4210-audss-clock", | |
| 131 | exynos_audss_clk_init); | |
| 132 | CLK_OF_DECLARE(exynos5250_audss_clk, "samsung,exynos5250-audss-clock", | |
| 133 | exynos_audss_clk_init); |