/* * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip. * * Copyright (C) 2009 Jon Smirl, Digispeaker * Author: Jon Smirl * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #include #include #include #include #include #include #include #include #include #include #include #include "mpc5200_dma.h" #include "mpc5200_psc_ac97.h" #define DRV_NAME "mpc5200-psc-ac97" /* ALSA only supports a single AC97 device so static is recommend here */ static struct psc_dma *psc_dma; static unsigned short psc_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { int status; unsigned int val; mutex_lock(&psc_dma->mutex); /* Wait for command send status zero = ready */ status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & MPC52xx_PSC_SR_CMDSEND), 100, 0); if (status == 0) { pr_err("timeout on ac97 bus (rdy)\n"); mutex_unlock(&psc_dma->mutex); return -ENODEV; } /* Force clear the data valid bit */ in_be32(&psc_dma->psc_regs->ac97_data); /* Send the read */ out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); /* Wait for the answer */ status = spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) & MPC52xx_PSC_SR_DATA_VAL), 100, 0); if (status == 0) { pr_err("timeout on ac97 read (val) %x\n", in_be16(&psc_dma->psc_regs->sr_csr.status)); mutex_unlock(&psc_dma->mutex); return -ENODEV; } /* Get the data */ val = in_be32(&psc_dma->psc_regs->ac97_data); if (((val >> 24) & 0x7f) != reg) { pr_err("reg echo error on ac97 read\n"); mutex_unlock(&psc_dma->mutex); return -ENODEV; } val = (val >> 8) & 0xffff; mutex_unlock(&psc_dma->mutex); return (unsigned short) val; } static void psc_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { int status; mutex_lock(&psc_dma->mutex); /* Wait for command status zero = ready */ status = spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & MPC52xx_PSC_SR_CMDSEND), 100, 0); if (status == 0) { pr_err("timeout on ac97 bus (write)\n"); goto out; } /* Write data */ out_be32(&psc_dma->psc_regs->ac97_cmd, ((reg & 0x7f) << 24) | (val << 8)); out: mutex_unlock(&psc_dma->mutex); } static void psc_ac97_warm_reset(struct snd_ac97 *ac97) { struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; mutex_lock(&psc_dma->mutex); out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); udelay(3); out_be32(®s->sicr, psc_dma->sicr); mutex_unlock(&psc_dma->mutex); } static void psc_ac97_cold_reset(struct snd_ac97 *ac97) { struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; mutex_lock(&psc_dma->mutex); dev_dbg(psc_dma->dev, "cold reset\n"); mpc5200_psc_ac97_gpio_reset(psc_dma->id); /* Notify the PSC that a reset has occurred */ out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_ACRB); /* Re-enable RX and TX */ out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); mutex_unlock(&psc_dma->mutex); msleep(1); psc_ac97_warm_reset(ac97); } struct snd_ac97_bus_ops soc_ac97_ops = { .read = psc_ac97_read, .write = psc_ac97_write, .reset = psc_ac97_cold_reset, .warm_reset = psc_ac97_warm_reset, }; EXPORT_SYMBOL_GPL(soc_ac97_ops); static int psc_ac97_hw_analog_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); dev_dbg(psc_dma->dev, "%s(substream=%p) p_size=%i p_bytes=%i" " periods=%i buffer_size=%i buffer_bytes=%i channels=%i" " rate=%i format=%i\n", __func__, substream, params_period_size(params), params_period_bytes(params), params_periods(params), params_buffer_size(params), params_buffer_bytes(params), params_channels(params), params_rate(params), params_format(params)); /* Determine the set of enable bits to turn on */ s->ac97_slot_bits = (params_channels(params) == 1) ? 0x100 : 0x300; if (substream->pstr->stream != SNDRV_PCM_STREAM_CAPTURE) s->ac97_slot_bits <<= 16; return 0; } static int psc_ac97_hw_digital_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *cpu_dai) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); dev_dbg(psc_dma->dev, "%s(substream=%p)\n", __func__, substream); if (params_channels(params) == 1) out_be32(&psc_dma->psc_regs->ac97_slots, 0x01000000); else out_be32(&psc_dma->psc_regs->ac97_slots, 0x03000000); return 0; } static int psc_ac97_trigger(struct snd_pcm_substream *substream, int cmd, struct snd_soc_dai *dai) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(dai); struct psc_dma_stream *s = to_psc_dma_stream(substream, psc_dma); switch (cmd) { case SNDRV_PCM_TRIGGER_START: dev_dbg(psc_dma->dev, "AC97 START: stream=%i\n", substream->pstr->stream); /* Set the slot enable bits */ psc_dma->slots |= s->ac97_slot_bits; out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); break; case SNDRV_PCM_TRIGGER_STOP: dev_dbg(psc_dma->dev, "AC97 STOP: stream=%i\n", substream->pstr->stream); /* Clear the slot enable bits */ psc_dma->slots &= ~(s->ac97_slot_bits); out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); break; } return 0; } static int psc_ac97_probe(struct snd_soc_dai *cpu_dai) { struct psc_dma *psc_dma = snd_soc_dai_get_drvdata(cpu_dai); struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; /* Go */ out_8(®s->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE); return 0; } /* --------------------------------------------------------------------- * ALSA SoC Bindings * * - Digital Audio Interface (DAI) template * - create/destroy dai hooks */ /** * psc_ac97_dai_template: template CPU Digital Audio Interface */ static struct snd_soc_dai_ops psc_ac97_analog_ops = { .hw_params = psc_ac97_hw_analog_params, .trigger = psc_ac97_trigger, }; static struct snd_soc_dai_ops psc_ac97_digital_ops = { .hw_params = psc_ac97_hw_digital_params, }; static struct snd_soc_dai_driver psc_ac97_dai[] = { { .ac97_control = 1, .probe = psc_ac97_probe, .playback = { .channels_min = 1, .channels_max = 6, .rates = SNDRV_PCM_RATE_8000_48000, .formats = SNDRV_PCM_FMTBIT_S32_BE, }, .capture = { .channels_min = 1, .channels_max = 2, .rates = SNDRV_PCM_RATE_8000_48000, .formats = SNDRV_PCM_FMTBIT_S32_BE, }, .ops = &psc_ac97_analog_ops, }, { .ac97_control = 1, .playback = { .channels_min = 1, .channels_max = 2, .rates = SNDRV_PCM_RATE_32000 | \ SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000, .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_BE, }, .ops = &psc_ac97_digital_ops, } }; /* --------------------------------------------------------------------- * OF platform bus binding code: * - Probe/remove operations * - OF device match table */ static int __devinit psc_ac97_of_probe(struct platform_device *op) { int rc; struct snd_ac97 ac97; struct mpc52xx_psc __iomem *regs; rc = snd_soc_register_dais(&op->dev, psc_ac97_dai, ARRAY_SIZE(psc_ac97_dai)); if (rc != 0) { dev_err(&op->dev, "Failed to register DAI\n"); return rc; } psc_dma = dev_get_drvdata(&op->dev); regs = psc_dma->psc_regs; ac97.private_data = psc_dma; psc_dma->imr = 0; out_be16(&psc_dma->psc_regs->isr_imr.imr, psc_dma->imr); /* Configure the serial interface mode to AC97 */ psc_dma->sicr = MPC52xx_PSC_SICR_SIM_AC97 | MPC52xx_PSC_SICR_ENAC97; out_be32(®s->sicr, psc_dma->sicr); /* No slots active */ out_be32(®s->ac97_slots, 0x00000000); return 0; } static int __devexit psc_ac97_of_remove(struct platform_device *op) { snd_soc_unregister_dais(&op->dev, ARRAY_SIZE(psc_ac97_dai)); return 0; } /* Match table for of_platform binding */ static struct of_device_id psc_ac97_match[] __devinitdata = { { .compatible = "fsl,mpc5200-psc-ac97", }, { .compatible = "fsl,mpc5200b-psc-ac97", }, {} }; MODULE_DEVICE_TABLE(of, psc_ac97_match); static struct platform_driver psc_ac97_driver = { .probe = psc_ac97_of_probe, .remove = __devexit_p(psc_ac97_of_remove), .driver = { .name = "mpc5200-psc-ac97", .owner = THIS_MODULE, .of_match_table = psc_ac97_match, }, }; /* --------------------------------------------------------------------- * Module setup and teardown; simply register the of_platform driver * for the PSC in AC97 mode. */ static int __init psc_ac97_init(void) { return platform_driver_register(&psc_ac97_driver); } module_init(psc_ac97_init); static void __exit psc_ac97_exit(void) { platform_driver_unregister(&psc_ac97_driver); } module_exit(psc_ac97_exit); MODULE_AUTHOR("Jon Smirl "); MODULE_DESCRIPTION("mpc5200 AC97 module"); MODULE_LICENSE("GPL");