/* * Copyright (c) 2009-2010 Nuvoton technology corporation. * * Wan ZongShun * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation;version 2 of the License. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "nuc900-auido.h" static DEFINE_MUTEX(ac97_mutex); struct nuc900_audio *nuc900_ac97_data; static int nuc900_checkready(void) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; if (!(AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS0) & CODEC_READY)) return -EPERM; return 0; } /* AC97 controller reads codec register */ static unsigned short nuc900_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; unsigned long timeout = 0x10000, val; mutex_lock(&ac97_mutex); val = nuc900_checkready(); if (!!val) { dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); goto out; } /* set the R_WB bit and write register index */ AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, R_WB | reg); /* set the valid frame bit and valid slots */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); val |= (VALID_FRAME | SLOT1_VALID); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); udelay(100); /* polling the AC_R_FINISH */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val &= AC_R_FINISH; while (!val && timeout--) mdelay(1); if (!timeout) { dev_err(nuc900_audio->dev, "AC97 read register time out !\n"); val = -EPERM; goto out; } val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0) ; val &= ~SLOT1_VALID; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, val); if (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS1) >> 2 != reg) { dev_err(nuc900_audio->dev, "R_INDEX of REG_ACTL_ACIS1 not match!\n"); } udelay(100); val = (AUDIO_READ(nuc900_audio->mmio + ACTL_ACIS2) & 0xFFFF); out: mutex_unlock(&ac97_mutex); return val; } /* AC97 controller writes to codec register */ static void nuc900_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; unsigned long tmp, timeout = 0x10000; mutex_lock(&ac97_mutex); tmp = nuc900_checkready(); if (!!tmp) dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); /* clear the R_WB bit and write register index */ AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS1, reg); /* write register value */ AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS2, val); /* set the valid frame bit and valid slots */ tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); tmp |= SLOT1_VALID | SLOT2_VALID | VALID_FRAME; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); udelay(100); /* polling the AC_W_FINISH */ tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); tmp &= AC_W_FINISH; while (tmp && timeout--) mdelay(1); if (!timeout) dev_err(nuc900_audio->dev, "AC97 write register time out !\n"); tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); tmp &= ~(SLOT1_VALID | SLOT2_VALID); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); mutex_unlock(&ac97_mutex); } static void nuc900_ac97_warm_reset(struct snd_ac97 *ac97) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; unsigned long val; mutex_lock(&ac97_mutex); /* warm reset AC 97 */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val |= AC_W_RES; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); udelay(1000); val = nuc900_checkready(); if (!!val) dev_err(nuc900_audio->dev, "AC97 codec is not ready\n"); mutex_unlock(&ac97_mutex); } static void nuc900_ac97_cold_reset(struct snd_ac97 *ac97) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; unsigned long val; mutex_lock(&ac97_mutex); /* reset Audio Controller */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val |= ACTL_RESET_BIT; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); udelay(1000); val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val &= (~ACTL_RESET_BIT); AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); udelay(1000); /* reset AC-link interface */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val |= AC_RESET; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); udelay(1000); val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); val &= ~AC_RESET; AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); udelay(1000); /* cold reset AC 97 */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val |= AC_C_RES; AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); udelay(1000); val = AUDIO_READ(nuc900_audio->mmio + ACTL_ACCON); val &= (~AC_C_RES); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACCON, val); udelay(1000); mutex_unlock(&ac97_mutex); } /* AC97 controller operations */ struct snd_ac97_bus_ops soc_ac97_ops = { .read = nuc900_ac97_read, .write = nuc900_ac97_write, .reset = nuc900_ac97_cold_reset, .warm_reset = nuc900_ac97_warm_reset, } EXPORT_SYMBOL_GPL(soc_ac97_ops); static int nuc900_ac97_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; int ret; unsigned long val, tmp; ret = 0; switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); tmp |= (SLOT3_VALID | SLOT4_VALID | VALID_FRAME); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_PSR); tmp |= (P_DMA_END_IRQ | P_DMA_MIDDLE_IRQ); AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, tmp); val |= AC_PLAY; } else { tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_RSR); tmp |= (R_DMA_END_IRQ | R_DMA_MIDDLE_IRQ); AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, tmp); val |= AC_RECORD; } AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: val = AUDIO_READ(nuc900_audio->mmio + ACTL_RESET); if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { tmp = AUDIO_READ(nuc900_audio->mmio + ACTL_ACOS0); tmp &= ~(SLOT3_VALID | SLOT4_VALID); AUDIO_WRITE(nuc900_audio->mmio + ACTL_ACOS0, tmp); AUDIO_WRITE(nuc900_audio->mmio + ACTL_PSR, RESET_PRSR); val &= ~AC_PLAY; } else { AUDIO_WRITE(nuc900_audio->mmio + ACTL_RSR, RESET_PRSR); val &= ~AC_RECORD; } AUDIO_WRITE(nuc900_audio->mmio + ACTL_RESET, val); break; default: ret = -EINVAL; } return ret; } static int nuc900_ac97_probe(struct platform_device *pdev, struct snd_soc_dai *dai) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; unsigned long val; mutex_lock(&ac97_mutex); /* enable unit clock */ clk_enable(nuc900_audio->clk); /* enable audio controller and AC-link interface */ val = AUDIO_READ(nuc900_audio->mmio + ACTL_CON); val |= (IIS_AC_PIN_SEL | ACLINK_EN); AUDIO_WRITE(nuc900_audio->mmio + ACTL_CON, val); mutex_unlock(&ac97_mutex); return 0; } static void nuc900_ac97_remove(struct platform_device *pdev, struct snd_soc_dai *dai) { struct nuc900_audio *nuc900_audio = nuc900_ac97_data; clk_disable(nuc900_audio->clk); } static struct snd_soc_dai_ops nuc900_ac97_dai_ops = { .trigger = nuc900_ac97_trigger, }; struct snd_soc_dai nuc900_ac97_dai = { .name = "nuc900-ac97", .probe = nuc900_ac97_probe, .remove = nuc900_ac97_remove, .ac97_control = 1, .playback = { .rates = SNDRV_PCM_RATE_8000_48000, .formats = SNDRV_PCM_FMTBIT_S16_LE, .channels_min = 1, .channels_max = 2, }, .capture = { .rates = SNDRV_PCM_RATE_8000_48000, .formats = SNDRV_PCM_FMTBIT_S16_LE, .channels_min = 1, .channels_max = 2, }, .ops = &nuc900_ac97_dai_ops, } EXPORT_SYMBOL_GPL(nuc900_ac97_dai); static int __devinit nuc900_ac97_drvprobe(struct platform_device *pdev) { struct nuc900_audio *nuc900_audio; int ret; if (nuc900_ac97_data) return -EBUSY; nuc900_audio = kzalloc(sizeof(struct nuc900_audio), GFP_KERNEL); if (!nuc900_audio) return -ENOMEM; spin_lock_init(&nuc900_audio->lock); nuc900_audio->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!nuc900_audio->res) { ret = -ENODEV; goto out0; } if (!request_mem_region(nuc900_audio->res->start, resource_size(nuc900_audio->res), pdev->name)) { ret = -EBUSY; goto out0; } nuc900_audio->mmio = ioremap(nuc900_audio->res->start, resource_size(nuc900_audio->res)); if (!nuc900_audio->mmio) { ret = -ENOMEM; goto out1; } nuc900_audio->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(nuc900_audio->clk)) { ret = PTR_ERR(nuc900_audio->clk); goto out2; } nuc900_audio->irq_num = platform_get_irq(pdev, 0); if (!nuc900_audio->irq_num) { ret = -EBUSY; goto out2; } nuc900_ac97_data = nuc900_audio; nuc900_audio->dev = nuc900_ac97_dai.dev = &pdev->dev; ret = snd_soc_register_dai(&nuc900_ac97_dai); if (ret) goto out3; mfp_set_groupg(nuc900_audio->dev); /* enbale ac97 multifunction pin*/ return 0; out3: clk_put(nuc900_audio->clk); out2: iounmap(nuc900_audio->mmio); out1: release_mem_region(nuc900_audio->res->start, resource_size(nuc900_audio->res)); out0: kfree(nuc900_audio); return ret; } static int __devexit nuc900_ac97_drvremove(struct platform_device *pdev) { snd_soc_unregister_dai(&nuc900_ac97_dai); clk_put(nuc900_ac97_data->clk); iounmap(nuc900_ac97_data->mmio); release_mem_region(nuc900_ac97_data->res->start, resource_size(nuc900_ac97_data->res)); nuc900_ac97_data = NULL; return 0; } static struct platform_driver nuc900_ac97_driver = { .driver = { .name = "nuc900-audio", .owner = THIS_MODULE, }, .probe = nuc900_ac97_drvprobe, .remove = __devexit_p(nuc900_ac97_drvremove), }; static int __init nuc900_ac97_init(void) { return platform_driver_register(&nuc900_ac97_driver); } static void __exit nuc900_ac97_exit(void) { platform_driver_unregister(&nuc900_ac97_driver); } module_init(nuc900_ac97_init); module_exit(nuc900_ac97_exit); MODULE_AUTHOR("Wan ZongShun "); MODULE_DESCRIPTION("NUC900 AC97 SoC driver!"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:nuc900-ac97");