arch/arm/mach-omap2/board-n800-audio.c

   1 /*
   2  * linux/arch/arm/mach-omap2/board-n800-audio.c
   3  *
   4  * Copyright (C) 2006 Nokia Corporation
   5  * Contact: Juha Yrjola
   6  *          Jarkko Nikula <jarkko.nikula@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/err.h>
  25 #include <linux/clk.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/spi/tsc2301.h>
  28
  29 #include <asm/io.h>
  30 #include <mach/eac.h>
  31
  32 #include <mach/dsp_common.h>
  33
  34 #if defined(CONFIG_SPI_TSC2301_AUDIO) && defined(CONFIG_SND_OMAP24XX_EAC)
  35 #define AUDIO_ENABLED
  36
  37 static struct clk *sys_clkout2;
  38 static struct clk *sys_clkout2_src;
  39 static struct clk *func96m_clk;
  40 static struct device *eac_device;
  41 static struct device *tsc2301_device;
  42
  43 static int enable_audio;
  44 static int audio_ok;
  45 static spinlock_t audio_lock;
  46
  47 /*
  48  * Leaving EAC and sys_clkout2 pins multiplexed to those subsystems results
  49  * in about 2 mA extra current leak when audios are powered down. The
  50  * workaround is to multiplex them to protected mode (with pull-ups enabled)
  51  * whenever audio is not being used.
  52  */
  53 static int eac_mux_disabled = 0;
  54 static int clkout2_mux_disabled = 0;
  55 static u32 saved_mux[2];
  56
  57 static void n800_enable_eac_mux(void)
  58 {
  59         if (!eac_mux_disabled)
  60                 return;
  61         __raw_writel(saved_mux[1], OMAP2_IO_ADDRESS(0x48000124));
  62         eac_mux_disabled = 0;
  63 }
  64
  65 static void n800_disable_eac_mux(void)
  66 {
  67         if (eac_mux_disabled) {
  68                 WARN_ON(eac_mux_disabled);
  69                 return;
  70         }
  71         saved_mux[1] = __raw_readl(OMAP2_IO_ADDRESS(0x48000124));
  72         __raw_writel(0x1f1f1f1f, OMAP2_IO_ADDRESS(0x48000124));
  73         eac_mux_disabled = 1;
  74 }
  75
  76 static void n800_enable_clkout2_mux(void)
  77 {
  78         if (!clkout2_mux_disabled)
  79                 return;
  80         __raw_writel(saved_mux[0], OMAP2_IO_ADDRESS(0x480000e8));
  81         clkout2_mux_disabled = 0;
  82 }
  83
  84 static void n800_disable_clkout2_mux(void)
  85 {
  86         u32 l;
  87
  88         if (clkout2_mux_disabled) {
  89                 WARN_ON(clkout2_mux_disabled);
  90                 return;
  91         }
  92         saved_mux[0] = __raw_readl(OMAP2_IO_ADDRESS(0x480000e8));
  93         l = saved_mux[0] & ~0xff;
  94         l |= 0x1f;
  95         __raw_writel(l, OMAP2_IO_ADDRESS(0x480000e8));
  96         clkout2_mux_disabled = 1;
  97 }
  98
  99 static int n800_eac_enable_ext_clocks(struct device *dev)
 100 {
 101         BUG_ON(tsc2301_device == NULL);
 102         n800_enable_eac_mux();
 103         tsc2301_mixer_enable_mclk(tsc2301_device);
 104
 105         return 0;
 106 }
 107
 108 static void n800_eac_disable_ext_clocks(struct device *dev)
 109 {
 110         BUG_ON(tsc2301_device == NULL);
 111         tsc2301_mixer_disable_mclk(tsc2301_device);
 112         n800_disable_eac_mux();
 113 }
 114
 115 static int n800_audio_set_power(void *pdata, int dac, int adc)
 116 {
 117         BUG_ON(pdata != tsc2301_device);
 118         tsc2301_mixer_set_power(tsc2301_device, dac, adc);
 119
 120         return 0;
 121 }
 122
 123 static int n800_audio_register_controls(void *pdata, struct snd_card *card)
 124 {
 125         BUG_ON(pdata != tsc2301_device);
 126         return tsc2301_mixer_register_controls(tsc2301_device, card);
 127 }
 128
 129 static struct eac_codec n800_eac_codec = {
 130         .mclk_src = EAC_MCLK_EXT_2x12288000,
 131         .codec_mode = EAC_CODEC_I2S_MASTER,
 132         .codec_conf.i2s.polarity_changed_mode = 0,
 133         .codec_conf.i2s.sync_delay_enable = 0,
 134         .default_rate = 48000,
 135         .set_power = n800_audio_set_power,
 136         .register_controls = n800_audio_register_controls,
 137         .short_name = "TSC2301",
 138 };
 139
 140 static int n800_register_codec(void)
 141 {
 142         int r, do_enable = 0;
 143         unsigned long flags;
 144
 145         n800_eac_codec.private_data = tsc2301_device;
 146         r = eac_register_codec(eac_device, &n800_eac_codec);
 147         if (r < 0)
 148                 return r;
 149         spin_lock_irqsave(&audio_lock, flags);
 150         audio_ok = 1;
 151         if (enable_audio)
 152                 do_enable = 1;
 153         spin_unlock_irqrestore(&audio_lock, flags);
 154         if (do_enable)
 155                 eac_set_mode(eac_device, 1, 1);
 156         return 0;
 157 }
 158
 159 static void n800_unregister_codec(void)
 160 {
 161         audio_ok = 0;
 162         eac_unregister_codec(eac_device);
 163         eac_set_mode(eac_device, 0, 0);
 164 }
 165
 166 static int n800_eac_init(struct device *dev)
 167 {
 168         int r;
 169
 170         BUG_ON(eac_device != NULL);
 171         eac_device = dev;
 172         if (tsc2301_device != NULL) {
 173                 r = n800_register_codec();
 174                 if (r < 0)
 175                         return r;
 176         }
 177
 178         return 0;
 179 }
 180
 181 static void n800_eac_cleanup(struct device *dev)
 182 {
 183         eac_device = NULL;
 184         if (tsc2301_device != NULL)
 185                 n800_unregister_codec();
 186 }
 187
 188 static int n800_codec_get_clocks(struct device *dev)
 189 {
 190         sys_clkout2_src = clk_get(dev, "sys_clkout2_src");
 191         if (IS_ERR(sys_clkout2_src)) {
 192                 dev_err(dev, "Could not get sys_clkout2_src clock\n");
 193                 return -ENODEV;
 194         }
 195         sys_clkout2 = clk_get(dev, "sys_clkout2");
 196         if (IS_ERR(sys_clkout2)) {
 197                 dev_err(dev, "Could not get sys_clkout2 clock\n");
 198                 clk_put(sys_clkout2_src);
 199                 return -ENODEV;
 200         }
 201         /* configure 12 MHz output on SYS_CLKOUT2. Therefore we must use
 202          * 96 MHz as its parent in order to get 12 MHz */
 203         func96m_clk = clk_get(dev, "func_96m_ck");
 204         if (IS_ERR(func96m_clk)) {
 205                 dev_err(dev, "Could not get func 96M clock\n");
 206                 clk_put(sys_clkout2);
 207                 clk_put(sys_clkout2_src);
 208                 return -ENODEV;
 209         }
 210
 211         clk_set_parent(sys_clkout2_src, func96m_clk);
 212         clk_set_rate(sys_clkout2, 12000000);
 213
 214         return 0;
 215 }
 216
 217 static void n800_codec_put_clocks(struct device *dev)
 218 {
 219         clk_put(func96m_clk);
 220         clk_put(sys_clkout2);
 221         clk_put(sys_clkout2_src);
 222 }
 223
 224 static int n800_codec_enable_clock(struct device *dev)
 225 {
 226         n800_enable_clkout2_mux();
 227         return clk_enable(sys_clkout2);
 228 }
 229
 230 static void n800_codec_disable_clock(struct device *dev)
 231 {
 232         clk_disable(sys_clkout2);
 233         n800_disable_clkout2_mux();
 234 }
 235
 236 static int n800_codec_init(struct device *dev)
 237 {
 238         int r;
 239
 240         BUG_ON(tsc2301_device != NULL);
 241         tsc2301_device = dev;
 242         if ((r = n800_codec_get_clocks(dev)) < 0)
 243                 return r;
 244         if (eac_device != NULL) {
 245                 r = n800_register_codec();
 246                 if (r < 0) {
 247                         n800_codec_put_clocks(dev);
 248                         return r;
 249                 }
 250         }
 251         return 0;
 252 }
 253
 254 static void n800_codec_cleanup(struct device *dev)
 255 {
 256         tsc2301_device = NULL;
 257         if (eac_device != NULL)
 258                 n800_unregister_codec();
 259         n800_codec_put_clocks(dev);
 260 }
 261
 262 static struct eac_platform_data n800_eac_data = {
 263         .init = n800_eac_init,
 264         .cleanup = n800_eac_cleanup,
 265         .enable_ext_clocks = n800_eac_enable_ext_clocks,
 266         .disable_ext_clocks = n800_eac_disable_ext_clocks,
 267 };
 268
 269 static const struct tsc2301_mixer_gpio n800_mixer_gpios[] = {
 270         {
 271                 .name                   = "Headset Amplifier",
 272                 .gpio                   = 1,
 273                 .deactivate_on_pd       = 1,
 274         }, {
 275                 .name                   = "Speaker Amplifier",
 276                 .gpio                   = 2,
 277                 .def_enable             = 1,
 278                 .deactivate_on_pd       = 1,
 279         }, {
 280                 .name                   = "Headset Mic Select",
 281                 .gpio                   = 3,
 282         }
 283 };
 284
 285 static struct platform_device retu_headset_device = {
 286         .name           = "retu-headset",
 287         .id             = -1,
 288         .dev            = {
 289                 .release        = NULL,
 290         },
 291 };
 292
 293 void __init n800_audio_init(struct tsc2301_platform_data *tc)
 294 {
 295         spin_lock_init(&audio_lock);
 296
 297         if (platform_device_register(&retu_headset_device) < 0)
 298                 return;
 299         omap_init_eac(&n800_eac_data);
 300
 301         tc->pll_pdc = 7;
 302         tc->pll_a = 7;
 303         tc->pll_n = 9;
 304         tc->pll_output = 1;
 305         tc->mclk_ratio = TSC2301_MCLK_256xFS;
 306         tc->i2s_sample_rate = TSC2301_I2S_SR_48000;
 307         tc->i2s_format = TSC2301_I2S_FORMAT0;
 308         tc->power_down_blocks = TSC2301_REG_PD_MISC_MOPD;
 309         tc->mixer_gpios = n800_mixer_gpios;
 310         tc->n_mixer_gpios = ARRAY_SIZE(n800_mixer_gpios);
 311         tc->codec_init = n800_codec_init;
 312         tc->codec_cleanup = n800_codec_cleanup;
 313         tc->enable_clock = n800_codec_enable_clock;
 314         tc->disable_clock = n800_codec_disable_clock;
 315 }
 316
 317 #else
 318
 319 void __init n800_audio_init(struct tsc2301_platform_data *tc)
 320 {
 321 }
 322
 323 #endif
 324
 325 #ifdef CONFIG_OMAP_DSP
 326
 327 int n800_audio_enable(struct dsp_kfunc_device *kdev, int stage)
 328 {
 329 #ifdef AUDIO_ENABLED
 330         unsigned long flags;
 331         int do_enable = 0;
 332
 333         spin_lock_irqsave(&audio_lock, flags);
 334
 335         pr_debug("DSP power up request (audio codec %sinitialized)\n",
 336                  audio_ok ? "" : "not ");
 337
 338         if (enable_audio)
 339                 goto out;
 340         enable_audio = 1;
 341         if (audio_ok)
 342                 do_enable = 1;
 343 out:
 344         spin_unlock_irqrestore(&audio_lock, flags);
 345         if (do_enable)
 346                 eac_set_mode(eac_device, 1, 1);
 347 #endif
 348         return 0;
 349 }
 350
 351 int n800_audio_disable(struct dsp_kfunc_device *kdev, int stage)
 352 {
 353 #ifdef AUDIO_ENABLED
 354         unsigned long flags;
 355         int do_disable = 0;
 356
 357         spin_lock_irqsave(&audio_lock, flags);
 358
 359         pr_debug("DSP power down request (audio codec %sinitialized)\n",
 360                 audio_ok ? "" : "not ");
 361
 362         if (!enable_audio)
 363                 goto out;
 364         enable_audio = 0;
 365         if (audio_ok)
 366                 do_disable = 1;
 367 out:
 368         spin_unlock_irqrestore(&audio_lock, flags);
 369         if (do_disable)
 370                 eac_set_mode(eac_device, 0, 0);
 371 #endif
 372         return 0;
 373 }
 374
 375 #endif /* CONFIG_OMAP_DSP */