| /* |
| * linux/sound/mpc5200-ac97.c -- AC97 support for the Freescale MPC52xx chip. |
| * |
| * Copyright (C) 2009 Jon Smirl, Digispeaker |
| * Author: Jon Smirl <jonsmirl@gmail.com> |
| * |
| * 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 <linux/module.h> |
| #include <linux/of_device.h> |
| #include <linux/of_platform.h> |
| |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/soc.h> |
| |
| #include <asm/time.h> |
| #include <asm/delay.h> |
| #include <asm/mpc52xx_psc.h> |
| |
| #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 rc; |
| unsigned int val; |
| |
| /* Wait for command send status zero = ready */ |
| spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
| MPC52xx_PSC_SR_CMDSEND), 100, 0, rc); |
| if (rc == 0) { |
| pr_err("timeout on ac97 bus (rdy)\n"); |
| return -ENODEV; |
| } |
| /* Send the read */ |
| out_be32(&psc_dma->psc_regs->ac97_cmd, (1<<31) | ((reg & 0x7f) << 24)); |
| |
| /* Wait for the answer */ |
| spin_event_timeout((in_be16(&psc_dma->psc_regs->sr_csr.status) & |
| MPC52xx_PSC_SR_DATA_VAL), 100, 0, rc); |
| if (rc == 0) { |
| pr_err("timeout on ac97 read (val) %x\n", |
| in_be16(&psc_dma->psc_regs->sr_csr.status)); |
| 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"); |
| return -ENODEV; |
| } |
| val = (val >> 8) & 0xffff; |
| |
| return (unsigned short) val; |
| } |
| |
| static void psc_ac97_write(struct snd_ac97 *ac97, |
| unsigned short reg, unsigned short val) |
| { |
| int rc; |
| |
| /* Wait for command status zero = ready */ |
| spin_event_timeout(!(in_be16(&psc_dma->psc_regs->sr_csr.status) & |
| MPC52xx_PSC_SR_CMDSEND), 100, 0, rc); |
| if (rc == 0) { |
| pr_err("timeout on ac97 bus (write)\n"); |
| return; |
| } |
| /* Write data */ |
| out_be32(&psc_dma->psc_regs->ac97_cmd, |
| ((reg & 0x7f) << 24) | (val << 8)); |
| } |
| |
| static void psc_ac97_warm_reset(struct snd_ac97 *ac97) |
| { |
| int rc; |
| struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
| |
| out_be32(®s->sicr, psc_dma->sicr | MPC52xx_PSC_SICR_AWR); |
| spin_event_timeout(0, 3, 0, rc); |
| out_be32(®s->sicr, psc_dma->sicr); |
| } |
| |
| static void psc_ac97_cold_reset(struct snd_ac97 *ac97) |
| { |
| int rc; |
| struct mpc52xx_psc __iomem *regs = psc_dma->psc_regs; |
| |
| /* Do a cold reset */ |
| out_8(®s->op1, MPC52xx_PSC_OP_RES); |
| spin_event_timeout(0, 10, 0, rc); |
| out_8(®s->op0, MPC52xx_PSC_OP_RES); |
| spin_event_timeout(0, 50, 0, rc); |
| 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 = cpu_dai->private_data; |
| |
| 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)); |
| |
| |
| if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) { |
| if (params_channels(params) == 1) |
| psc_dma->slots |= 0x00000100; |
| else |
| psc_dma->slots |= 0x00000300; |
| } else { |
| if (params_channels(params) == 1) |
| psc_dma->slots |= 0x01000000; |
| else |
| psc_dma->slots |= 0x03000000; |
| } |
| out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
| |
| 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 = cpu_dai->private_data; |
| |
| 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 snd_soc_pcm_runtime *rtd = substream->private_data; |
| struct psc_dma *psc_dma = rtd->dai->cpu_dai->private_data; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_STOP: |
| if (substream->pstr->stream == SNDRV_PCM_STREAM_CAPTURE) |
| psc_dma->slots &= 0xFFFF0000; |
| else |
| psc_dma->slots &= 0x0000FFFF; |
| |
| out_be32(&psc_dma->psc_regs->ac97_slots, psc_dma->slots); |
| break; |
| } |
| return 0; |
| } |
| |
| static int psc_ac97_probe(struct platform_device *pdev, |
| struct snd_soc_dai *cpu_dai) |
| { |
| struct psc_dma *psc_dma = cpu_dai->private_data; |
| 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, |
| }; |
| |
| struct snd_soc_dai psc_ac97_dai[] = { |
| { |
| .name = "AC97", |
| .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, |
| }, |
| { |
| .name = "SPDIF", |
| .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, |
| } }; |
| EXPORT_SYMBOL_GPL(psc_ac97_dai); |
| |
| |
| |
| /* --------------------------------------------------------------------- |
| * OF platform bus binding code: |
| * - Probe/remove operations |
| * - OF device match table |
| */ |
| static int __devinit psc_ac97_of_probe(struct of_device *op, |
| const struct of_device_id *match) |
| { |
| int rc, i; |
| struct snd_ac97 ac97; |
| struct mpc52xx_psc __iomem *regs; |
| |
| rc = mpc5200_audio_dma_create(op); |
| if (rc != 0) |
| return rc; |
| |
| for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) |
| psc_ac97_dai[i].dev = &op->dev; |
| |
| rc = snd_soc_register_dais(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; |
| |
| for (i = 0; i < ARRAY_SIZE(psc_ac97_dai); i++) |
| psc_ac97_dai[i].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 of_device *op) |
| { |
| return mpc5200_audio_dma_destroy(op); |
| } |
| |
| /* 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 of_platform_driver psc_ac97_driver = { |
| .match_table = psc_ac97_match, |
| .probe = psc_ac97_of_probe, |
| .remove = __devexit_p(psc_ac97_of_remove), |
| .driver = { |
| .name = "mpc5200-psc-ac97", |
| .owner = THIS_MODULE, |
| }, |
| }; |
| |
| /* --------------------------------------------------------------------- |
| * Module setup and teardown; simply register the of_platform driver |
| * for the PSC in AC97 mode. |
| */ |
| static int __init psc_ac97_init(void) |
| { |
| return of_register_platform_driver(&psc_ac97_driver); |
| } |
| module_init(psc_ac97_init); |
| |
| static void __exit psc_ac97_exit(void) |
| { |
| of_unregister_platform_driver(&psc_ac97_driver); |
| } |
| module_exit(psc_ac97_exit); |
| |
| MODULE_AUTHOR("Jon Smirl <jonsmirl@gmail.com>"); |
| MODULE_DESCRIPTION("mpc5200 AC97 module"); |
| MODULE_LICENSE("GPL"); |
| |