/* * Freescale MPC5200 PSC in I2S mode * ALSA SoC Digital Audio Interface (DAI) driver * * Copyright (C) 2008 Secret Lab Technologies Ltd. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mpc5200_dma.h" MODULE_AUTHOR("Grant Likely "); MODULE_DESCRIPTION("Freescale MPC5200 PSC in I2S mode ASoC Driver"); MODULE_LICENSE("GPL"); /** * PSC_I2S_RATES: sample rates supported by the I2S * * This driver currently only supports the PSC running in I2S slave mode, * which means the codec determines the sample rate. Therefore, we tell * ALSA that we support all rates and let the codec driver decide what rates * are really supported. */ #define PSC_I2S_RATES (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_192000 | \ SNDRV_PCM_RATE_CONTINUOUS) /** * PSC_I2S_FORMATS: audio formats supported by the PSC I2S mode */ #define PSC_I2S_FORMATS (SNDRV_PCM_FMTBIT_S8 | SNDRV_PCM_FMTBIT_S16_BE | \ SNDRV_PCM_FMTBIT_S24_BE | SNDRV_PCM_FMTBIT_S24_BE | \ SNDRV_PCM_FMTBIT_S32_BE) static int psc_i2s_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, struct snd_soc_dai *dai) { struct snd_soc_pcm_runtime *rtd = substream->private_data; struct psc_i2s *psc_i2s = rtd->dai->cpu_dai->private_data; u32 mode; dev_dbg(psc_i2s->dev, "%s(substream=%p) p_size=%i p_bytes=%i" " periods=%i buffer_size=%i buffer_bytes=%i\n", __func__, substream, params_period_size(params), params_period_bytes(params), params_periods(params), params_buffer_size(params), params_buffer_bytes(params)); switch (params_format(params)) { case SNDRV_PCM_FORMAT_S8: mode = MPC52xx_PSC_SICR_SIM_CODEC_8; break; case SNDRV_PCM_FORMAT_S16_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_16; break; case SNDRV_PCM_FORMAT_S24_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_24; break; case SNDRV_PCM_FORMAT_S32_BE: mode = MPC52xx_PSC_SICR_SIM_CODEC_32; break; default: dev_dbg(psc_i2s->dev, "invalid format\n"); return -EINVAL; } out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | mode); snd_pcm_set_runtime_buffer(substream, &substream->dma_buffer); return 0; } /** * psc_i2s_set_sysclk: set the clock frequency and direction * * This function is called by the machine driver to tell us what the clock * frequency and direction are. * * Currently, we only support operating as a clock slave (SND_SOC_CLOCK_IN), * and we don't care about the frequency. Return an error if the direction * is not SND_SOC_CLOCK_IN. * * @clk_id: reserved, should be zero * @freq: the frequency of the given clock ID, currently ignored * @dir: SND_SOC_CLOCK_IN (clock slave) or SND_SOC_CLOCK_OUT (clock master) */ static int psc_i2s_set_sysclk(struct snd_soc_dai *cpu_dai, int clk_id, unsigned int freq, int dir) { struct psc_i2s *psc_i2s = cpu_dai->private_data; dev_dbg(psc_i2s->dev, "psc_i2s_set_sysclk(cpu_dai=%p, dir=%i)\n", cpu_dai, dir); return (dir == SND_SOC_CLOCK_IN) ? 0 : -EINVAL; } /** * psc_i2s_set_fmt: set the serial format. * * This function is called by the machine driver to tell us what serial * format to use. * * This driver only supports I2S mode. Return an error if the format is * not SND_SOC_DAIFMT_I2S. * * @format: one of SND_SOC_DAIFMT_xxx */ static int psc_i2s_set_fmt(struct snd_soc_dai *cpu_dai, unsigned int format) { struct psc_i2s *psc_i2s = cpu_dai->private_data; dev_dbg(psc_i2s->dev, "psc_i2s_set_fmt(cpu_dai=%p, format=%i)\n", cpu_dai, format); return (format == SND_SOC_DAIFMT_I2S) ? 0 : -EINVAL; } /* --------------------------------------------------------------------- * ALSA SoC Bindings * * - Digital Audio Interface (DAI) template * - create/destroy dai hooks */ /** * psc_i2s_dai_template: template CPU Digital Audio Interface */ static struct snd_soc_dai_ops psc_i2s_dai_ops = { .startup = psc_i2s_startup, .hw_params = psc_i2s_hw_params, .hw_free = psc_i2s_hw_free, .shutdown = psc_i2s_shutdown, .trigger = psc_i2s_trigger, .set_sysclk = psc_i2s_set_sysclk, .set_fmt = psc_i2s_set_fmt, }; static struct snd_soc_dai psc_i2s_dai_template = { .playback = { .channels_min = 2, .channels_max = 2, .rates = PSC_I2S_RATES, .formats = PSC_I2S_FORMATS, }, .capture = { .channels_min = 2, .channels_max = 2, .rates = PSC_I2S_RATES, .formats = PSC_I2S_FORMATS, }, .ops = &psc_i2s_dai_ops, }; /* --------------------------------------------------------------------- * Sysfs attributes for debugging */ static ssize_t psc_i2s_status_show(struct device *dev, struct device_attribute *attr, char *buf) { struct psc_i2s *psc_i2s = dev_get_drvdata(dev); return sprintf(buf, "status=%.4x sicr=%.8x rfnum=%i rfstat=0x%.4x " "tfnum=%i tfstat=0x%.4x\n", in_be16(&psc_i2s->psc_regs->sr_csr.status), in_be32(&psc_i2s->psc_regs->sicr), in_be16(&psc_i2s->fifo_regs->rfnum) & 0x1ff, in_be16(&psc_i2s->fifo_regs->rfstat), in_be16(&psc_i2s->fifo_regs->tfnum) & 0x1ff, in_be16(&psc_i2s->fifo_regs->tfstat)); } static int *psc_i2s_get_stat_attr(struct psc_i2s *psc_i2s, const char *name) { if (strcmp(name, "playback_underrun") == 0) return &psc_i2s->stats.underrun_count; if (strcmp(name, "capture_overrun") == 0) return &psc_i2s->stats.overrun_count; return NULL; } static ssize_t psc_i2s_stat_show(struct device *dev, struct device_attribute *attr, char *buf) { struct psc_i2s *psc_i2s = dev_get_drvdata(dev); int *attrib; attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name); if (!attrib) return 0; return sprintf(buf, "%i\n", *attrib); } static ssize_t psc_i2s_stat_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { struct psc_i2s *psc_i2s = dev_get_drvdata(dev); int *attrib; attrib = psc_i2s_get_stat_attr(psc_i2s, attr->attr.name); if (!attrib) return 0; *attrib = simple_strtoul(buf, NULL, 0); return count; } static DEVICE_ATTR(status, 0644, psc_i2s_status_show, NULL); static DEVICE_ATTR(playback_underrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store); static DEVICE_ATTR(capture_overrun, 0644, psc_i2s_stat_show, psc_i2s_stat_store); /* --------------------------------------------------------------------- * OF platform bus binding code: * - Probe/remove operations * - OF device match table */ static int __devinit psc_i2s_of_probe(struct of_device *op, const struct of_device_id *match) { phys_addr_t fifo; struct psc_i2s *psc_i2s; struct resource res; int size, psc_id, irq, rc; const __be32 *prop; void __iomem *regs; dev_dbg(&op->dev, "probing psc i2s device\n"); /* Get the PSC ID */ prop = of_get_property(op->node, "cell-index", &size); if (!prop || size < sizeof *prop) return -ENODEV; psc_id = be32_to_cpu(*prop); /* Fetch the registers and IRQ of the PSC */ irq = irq_of_parse_and_map(op->node, 0); if (of_address_to_resource(op->node, 0, &res)) { dev_err(&op->dev, "Missing reg property\n"); return -ENODEV; } regs = ioremap(res.start, 1 + res.end - res.start); if (!regs) { dev_err(&op->dev, "Could not map registers\n"); return -ENODEV; } /* Allocate and initialize the driver private data */ psc_i2s = kzalloc(sizeof *psc_i2s, GFP_KERNEL); if (!psc_i2s) { iounmap(regs); return -ENOMEM; } spin_lock_init(&psc_i2s->lock); psc_i2s->irq = irq; psc_i2s->psc_regs = regs; psc_i2s->fifo_regs = regs + sizeof *psc_i2s->psc_regs; psc_i2s->dev = &op->dev; psc_i2s->playback.psc_i2s = psc_i2s; psc_i2s->capture.psc_i2s = psc_i2s; snprintf(psc_i2s->name, sizeof psc_i2s->name, "PSC%u", psc_id+1); /* Fill out the CPU DAI structure */ memcpy(&psc_i2s->dai, &psc_i2s_dai_template, sizeof psc_i2s->dai); psc_i2s->dai.private_data = psc_i2s; psc_i2s->dai.name = psc_i2s->name; psc_i2s->dai.id = psc_id; /* Find the address of the fifo data registers and setup the * DMA tasks */ fifo = res.start + offsetof(struct mpc52xx_psc, buffer.buffer_32); psc_i2s->capture.bcom_task = bcom_psc_gen_bd_rx_init(psc_id, 10, fifo, 512); psc_i2s->playback.bcom_task = bcom_psc_gen_bd_tx_init(psc_id, 10, fifo); if (!psc_i2s->capture.bcom_task || !psc_i2s->playback.bcom_task) { dev_err(&op->dev, "Could not allocate bestcomm tasks\n"); iounmap(regs); kfree(psc_i2s); return -ENODEV; } /* Disable all interrupts and reset the PSC */ out_be16(&psc_i2s->psc_regs->isr_imr.imr, 0); out_8(&psc_i2s->psc_regs->command, 3 << 4); /* reset transmitter */ out_8(&psc_i2s->psc_regs->command, 2 << 4); /* reset receiver */ out_8(&psc_i2s->psc_regs->command, 1 << 4); /* reset mode */ out_8(&psc_i2s->psc_regs->command, 4 << 4); /* reset error */ /* Configure the serial interface mode; defaulting to CODEC8 mode */ psc_i2s->sicr = MPC52xx_PSC_SICR_DTS1 | MPC52xx_PSC_SICR_I2S | MPC52xx_PSC_SICR_CLKPOL; if (of_get_property(op->node, "fsl,cellslave", NULL)) psc_i2s->sicr |= MPC52xx_PSC_SICR_CELLSLAVE | MPC52xx_PSC_SICR_GENCLK; out_be32(&psc_i2s->psc_regs->sicr, psc_i2s->sicr | MPC52xx_PSC_SICR_SIM_CODEC_8); /* Check for the codec handle. If it is not present then we * are done */ if (!of_get_property(op->node, "codec-handle", NULL)) return 0; /* Set up mode register; * First write: RxRdy (FIFO Alarm) generates rx FIFO irq * Second write: register Normal mode for non loopback */ out_8(&psc_i2s->psc_regs->mode, 0); out_8(&psc_i2s->psc_regs->mode, 0); /* Set the TX and RX fifo alarm thresholds */ out_be16(&psc_i2s->fifo_regs->rfalarm, 0x100); out_8(&psc_i2s->fifo_regs->rfcntl, 0x4); out_be16(&psc_i2s->fifo_regs->tfalarm, 0x100); out_8(&psc_i2s->fifo_regs->tfcntl, 0x7); /* Lookup the IRQ numbers */ psc_i2s->playback.irq = bcom_get_task_irq(psc_i2s->playback.bcom_task); psc_i2s->capture.irq = bcom_get_task_irq(psc_i2s->capture.bcom_task); /* Save what we've done so it can be found again later */ dev_set_drvdata(&op->dev, psc_i2s); /* Register the SYSFS files */ rc = device_create_file(psc_i2s->dev, &dev_attr_status); rc |= device_create_file(psc_i2s->dev, &dev_attr_capture_overrun); rc |= device_create_file(psc_i2s->dev, &dev_attr_playback_underrun); if (rc) dev_info(psc_i2s->dev, "error creating sysfs files\n"); snd_soc_register_platform(&psc_i2s_pcm_soc_platform); /* Tell the ASoC OF helpers about it */ of_snd_soc_register_platform(&psc_i2s_pcm_soc_platform, op->node, &psc_i2s->dai); return 0; } static int __devexit psc_i2s_of_remove(struct of_device *op) { struct psc_i2s *psc_i2s = dev_get_drvdata(&op->dev); dev_dbg(&op->dev, "psc_i2s_remove()\n"); snd_soc_unregister_platform(&psc_i2s_pcm_soc_platform); bcom_gen_bd_rx_release(psc_i2s->capture.bcom_task); bcom_gen_bd_tx_release(psc_i2s->playback.bcom_task); iounmap(psc_i2s->psc_regs); iounmap(psc_i2s->fifo_regs); kfree(psc_i2s); dev_set_drvdata(&op->dev, NULL); return 0; } /* Match table for of_platform binding */ static struct of_device_id psc_i2s_match[] __devinitdata = { { .compatible = "fsl,mpc5200-psc-i2s", }, {} }; MODULE_DEVICE_TABLE(of, psc_i2s_match); static struct of_platform_driver psc_i2s_driver = { .match_table = psc_i2s_match, .probe = psc_i2s_of_probe, .remove = __devexit_p(psc_i2s_of_remove), .driver = { .name = "mpc5200-psc-i2s", .owner = THIS_MODULE, }, }; /* --------------------------------------------------------------------- * Module setup and teardown; simply register the of_platform driver * for the PSC in I2S mode. */ static int __init psc_i2s_init(void) { return of_register_platform_driver(&psc_i2s_driver); } module_init(psc_i2s_init); static void __exit psc_i2s_exit(void) { of_unregister_platform_driver(&psc_i2s_driver); } module_exit(psc_i2s_exit);