Kuninori Morimoto | dfc9403 | 2013-07-21 21:36:46 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Helper routines for R-Car sound ADG. |
| 3 | * |
| 4 | * Copyright (C) 2013 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com> |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file "COPYING" in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | #include <linux/sh_clk.h> |
| 11 | #include <mach/clock.h> |
| 12 | #include "rsnd.h" |
| 13 | |
| 14 | #define CLKA 0 |
| 15 | #define CLKB 1 |
| 16 | #define CLKC 2 |
| 17 | #define CLKI 3 |
| 18 | #define CLKMAX 4 |
| 19 | |
| 20 | struct rsnd_adg { |
| 21 | struct clk *clk[CLKMAX]; |
| 22 | |
| 23 | int rate_of_441khz_div_6; |
| 24 | int rate_of_48khz_div_6; |
| 25 | }; |
| 26 | |
| 27 | #define for_each_rsnd_clk(pos, adg, i) \ |
| 28 | for (i = 0, (pos) = adg->clk[i]; \ |
| 29 | i < CLKMAX; \ |
| 30 | i++, (pos) = adg->clk[i]) |
| 31 | #define rsnd_priv_to_adg(priv) ((struct rsnd_adg *)(priv)->adg) |
| 32 | |
| 33 | static enum rsnd_reg rsnd_adg_ssi_reg_get(int id) |
| 34 | { |
| 35 | enum rsnd_reg reg; |
| 36 | |
| 37 | /* |
| 38 | * SSI 8 is not connected to ADG. |
| 39 | * it works with SSI 7 |
| 40 | */ |
| 41 | if (id == 8) |
| 42 | return RSND_REG_MAX; |
| 43 | |
| 44 | if (0 <= id && id <= 3) |
| 45 | reg = RSND_REG_AUDIO_CLK_SEL0; |
| 46 | else if (4 <= id && id <= 7) |
| 47 | reg = RSND_REG_AUDIO_CLK_SEL1; |
| 48 | else |
| 49 | reg = RSND_REG_AUDIO_CLK_SEL2; |
| 50 | |
| 51 | return reg; |
| 52 | } |
| 53 | |
| 54 | int rsnd_adg_ssi_clk_stop(struct rsnd_mod *mod) |
| 55 | { |
| 56 | struct rsnd_priv *priv = rsnd_mod_to_priv(mod); |
| 57 | enum rsnd_reg reg; |
| 58 | int id; |
| 59 | |
| 60 | /* |
| 61 | * "mod" = "ssi" here. |
| 62 | * we can get "ssi id" from mod |
| 63 | */ |
| 64 | id = rsnd_mod_id(mod); |
| 65 | reg = rsnd_adg_ssi_reg_get(id); |
| 66 | |
| 67 | rsnd_write(priv, mod, reg, 0); |
| 68 | |
| 69 | return 0; |
| 70 | } |
| 71 | |
| 72 | int rsnd_adg_ssi_clk_try_start(struct rsnd_mod *mod, unsigned int rate) |
| 73 | { |
| 74 | struct rsnd_priv *priv = rsnd_mod_to_priv(mod); |
| 75 | struct rsnd_adg *adg = rsnd_priv_to_adg(priv); |
| 76 | struct device *dev = rsnd_priv_to_dev(priv); |
| 77 | struct clk *clk; |
| 78 | enum rsnd_reg reg; |
| 79 | int id, shift, i; |
| 80 | u32 data; |
| 81 | int sel_table[] = { |
| 82 | [CLKA] = 0x1, |
| 83 | [CLKB] = 0x2, |
| 84 | [CLKC] = 0x3, |
| 85 | [CLKI] = 0x0, |
| 86 | }; |
| 87 | |
| 88 | dev_dbg(dev, "request clock = %d\n", rate); |
| 89 | |
| 90 | /* |
| 91 | * find suitable clock from |
| 92 | * AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC/AUDIO_CLKI. |
| 93 | */ |
| 94 | data = 0; |
| 95 | for_each_rsnd_clk(clk, adg, i) { |
| 96 | if (rate == clk_get_rate(clk)) { |
| 97 | data = sel_table[i]; |
| 98 | goto found_clock; |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * find 1/6 clock from BRGA/BRGB |
| 104 | */ |
| 105 | if (rate == adg->rate_of_441khz_div_6) { |
| 106 | data = 0x10; |
| 107 | goto found_clock; |
| 108 | } |
| 109 | |
| 110 | if (rate == adg->rate_of_48khz_div_6) { |
| 111 | data = 0x20; |
| 112 | goto found_clock; |
| 113 | } |
| 114 | |
| 115 | return -EIO; |
| 116 | |
| 117 | found_clock: |
| 118 | |
| 119 | /* |
| 120 | * This "mod" = "ssi" here. |
| 121 | * we can get "ssi id" from mod |
| 122 | */ |
| 123 | id = rsnd_mod_id(mod); |
| 124 | reg = rsnd_adg_ssi_reg_get(id); |
| 125 | |
| 126 | dev_dbg(dev, "ADG: ssi%d selects clk%d = %d", id, i, rate); |
| 127 | |
| 128 | /* |
| 129 | * Enable SSIx clock |
| 130 | */ |
| 131 | shift = (id % 4) * 8; |
| 132 | |
| 133 | rsnd_bset(priv, mod, reg, |
| 134 | 0xFF << shift, |
| 135 | data << shift); |
| 136 | |
| 137 | return 0; |
| 138 | } |
| 139 | |
| 140 | static void rsnd_adg_ssi_clk_init(struct rsnd_priv *priv, struct rsnd_adg *adg) |
| 141 | { |
| 142 | struct clk *clk; |
| 143 | unsigned long rate; |
| 144 | u32 ckr; |
| 145 | int i; |
| 146 | int brg_table[] = { |
| 147 | [CLKA] = 0x0, |
| 148 | [CLKB] = 0x1, |
| 149 | [CLKC] = 0x4, |
| 150 | [CLKI] = 0x2, |
| 151 | }; |
| 152 | |
| 153 | /* |
| 154 | * This driver is assuming that AUDIO_CLKA/AUDIO_CLKB/AUDIO_CLKC |
| 155 | * have 44.1kHz or 48kHz base clocks for now. |
| 156 | * |
| 157 | * SSI itself can divide parent clock by 1/1 - 1/16 |
| 158 | * So, BRGA outputs 44.1kHz base parent clock 1/32, |
| 159 | * and, BRGB outputs 48.0kHz base parent clock 1/32 here. |
| 160 | * see |
| 161 | * rsnd_adg_ssi_clk_try_start() |
| 162 | */ |
| 163 | ckr = 0; |
| 164 | adg->rate_of_441khz_div_6 = 0; |
| 165 | adg->rate_of_48khz_div_6 = 0; |
| 166 | for_each_rsnd_clk(clk, adg, i) { |
| 167 | rate = clk_get_rate(clk); |
| 168 | |
| 169 | if (0 == rate) /* not used */ |
| 170 | continue; |
| 171 | |
| 172 | /* RBGA */ |
| 173 | if (!adg->rate_of_441khz_div_6 && (0 == rate % 44100)) { |
| 174 | adg->rate_of_441khz_div_6 = rate / 6; |
| 175 | ckr |= brg_table[i] << 20; |
| 176 | } |
| 177 | |
| 178 | /* RBGB */ |
| 179 | if (!adg->rate_of_48khz_div_6 && (0 == rate % 48000)) { |
| 180 | adg->rate_of_48khz_div_6 = rate / 6; |
| 181 | ckr |= brg_table[i] << 16; |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | rsnd_priv_bset(priv, SSICKR, 0x00FF0000, ckr); |
| 186 | rsnd_priv_write(priv, BRRA, 0x00000002); /* 1/6 */ |
| 187 | rsnd_priv_write(priv, BRRB, 0x00000002); /* 1/6 */ |
| 188 | } |
| 189 | |
| 190 | int rsnd_adg_probe(struct platform_device *pdev, |
| 191 | struct rcar_snd_info *info, |
| 192 | struct rsnd_priv *priv) |
| 193 | { |
| 194 | struct rsnd_adg *adg; |
| 195 | struct device *dev = rsnd_priv_to_dev(priv); |
| 196 | struct clk *clk; |
| 197 | int i; |
| 198 | |
| 199 | adg = devm_kzalloc(dev, sizeof(*adg), GFP_KERNEL); |
| 200 | if (!adg) { |
| 201 | dev_err(dev, "ADG allocate failed\n"); |
| 202 | return -ENOMEM; |
| 203 | } |
| 204 | |
| 205 | adg->clk[CLKA] = clk_get(NULL, "audio_clk_a"); |
| 206 | adg->clk[CLKB] = clk_get(NULL, "audio_clk_b"); |
| 207 | adg->clk[CLKC] = clk_get(NULL, "audio_clk_c"); |
| 208 | adg->clk[CLKI] = clk_get(NULL, "audio_clk_internal"); |
| 209 | for_each_rsnd_clk(clk, adg, i) { |
| 210 | if (IS_ERR(clk)) { |
| 211 | dev_err(dev, "Audio clock failed\n"); |
| 212 | return -EIO; |
| 213 | } |
| 214 | } |
| 215 | |
| 216 | rsnd_adg_ssi_clk_init(priv, adg); |
| 217 | |
| 218 | priv->adg = adg; |
| 219 | |
| 220 | dev_dbg(dev, "adg probed\n"); |
| 221 | |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | void rsnd_adg_remove(struct platform_device *pdev, |
| 226 | struct rsnd_priv *priv) |
| 227 | { |
| 228 | struct rsnd_adg *adg = priv->adg; |
| 229 | struct clk *clk; |
| 230 | int i; |
| 231 | |
| 232 | for_each_rsnd_clk(clk, adg, i) |
| 233 | clk_put(clk); |
| 234 | } |