diff options
Diffstat (limited to 'sound/soc/blackfin/bf5xx-tdm.c')
| -rw-r--r-- | sound/soc/blackfin/bf5xx-tdm.c | 333 |
1 files changed, 333 insertions, 0 deletions
diff --git a/sound/soc/blackfin/bf5xx-tdm.c b/sound/soc/blackfin/bf5xx-tdm.c new file mode 100644 index 00000000..a822d1ee --- /dev/null +++ b/sound/soc/blackfin/bf5xx-tdm.c @@ -0,0 +1,333 @@ +/* + * File: sound/soc/blackfin/bf5xx-tdm.c + * Author: Barry Song <Barry.Song@analog.com> + * + * Created: Thurs June 04 2009 + * Description: Blackfin I2S(TDM) CPU DAI driver + * Even though TDM mode can be as part of I2S DAI, but there + * are so much difference in configuration and data flow, + * it's very ugly to integrate I2S and TDM into a module + * + * Modified: + * Copyright 2009 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see the file COPYING, or write + * to the Free Software Foundation, Inc., + * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/initval.h> +#include <sound/soc.h> + +#include <asm/irq.h> +#include <asm/portmux.h> +#include <linux/mutex.h> +#include <linux/gpio.h> + +#include "bf5xx-sport.h" +#include "bf5xx-tdm.h" + +static int bf5xx_tdm_set_dai_fmt(struct snd_soc_dai *cpu_dai, + unsigned int fmt) +{ + int ret = 0; + + /* interface format:support TDM,slave mode */ + switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) { + case SND_SOC_DAIFMT_DSP_A: + break; + default: + printk(KERN_ERR "%s: Unknown DAI format type\n", __func__); + ret = -EINVAL; + break; + } + + switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) { + case SND_SOC_DAIFMT_CBM_CFM: + break; + case SND_SOC_DAIFMT_CBS_CFS: + case SND_SOC_DAIFMT_CBM_CFS: + case SND_SOC_DAIFMT_CBS_CFM: + ret = -EINVAL; + break; + default: + printk(KERN_ERR "%s: Unknown DAI master type\n", __func__); + ret = -EINVAL; + break; + } + + return ret; +} + +static int bf5xx_tdm_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params, + struct snd_soc_dai *dai) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data; + int ret = 0; + + bf5xx_tdm->tcr2 &= ~0x1f; + bf5xx_tdm->rcr2 &= ~0x1f; + switch (params_format(params)) { + case SNDRV_PCM_FORMAT_S32_LE: + bf5xx_tdm->tcr2 |= 31; + bf5xx_tdm->rcr2 |= 31; + sport_handle->wdsize = 4; + break; + /* at present, we only support 32bit transfer */ + default: + pr_err("not supported PCM format yet\n"); + return -EINVAL; + break; + } + + if (!bf5xx_tdm->configured) { + /* + * TX and RX are not independent,they are enabled at the + * same time, even if only one side is running. So, we + * need to configure both of them at the time when the first + * stream is opened. + * + * CPU DAI:slave mode. + */ + ret = sport_config_rx(sport_handle, bf5xx_tdm->rcr1, + bf5xx_tdm->rcr2, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + return -EBUSY; + } + + ret = sport_config_tx(sport_handle, bf5xx_tdm->tcr1, + bf5xx_tdm->tcr2, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + return -EBUSY; + } + + bf5xx_tdm->configured = 1; + } + + return 0; +} + +static void bf5xx_tdm_shutdown(struct snd_pcm_substream *substream, + struct snd_soc_dai *dai) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data; + + /* No active stream, SPORT is allowed to be configured again. */ + if (!dai->active) + bf5xx_tdm->configured = 0; +} + +static int bf5xx_tdm_set_channel_map(struct snd_soc_dai *dai, + unsigned int tx_num, unsigned int *tx_slot, + unsigned int rx_num, unsigned int *rx_slot) +{ + struct sport_device *sport_handle = snd_soc_dai_get_drvdata(dai); + struct bf5xx_tdm_port *bf5xx_tdm = sport_handle->private_data; + int i; + unsigned int slot; + unsigned int tx_mapped = 0, rx_mapped = 0; + + if ((tx_num > BFIN_TDM_DAI_MAX_SLOTS) || + (rx_num > BFIN_TDM_DAI_MAX_SLOTS)) + return -EINVAL; + + for (i = 0; i < tx_num; i++) { + slot = tx_slot[i]; + if ((slot < BFIN_TDM_DAI_MAX_SLOTS) && + (!(tx_mapped & (1 << slot)))) { + bf5xx_tdm->tx_map[i] = slot; + tx_mapped |= 1 << slot; + } else + return -EINVAL; + } + for (i = 0; i < rx_num; i++) { + slot = rx_slot[i]; + if ((slot < BFIN_TDM_DAI_MAX_SLOTS) && + (!(rx_mapped & (1 << slot)))) { + bf5xx_tdm->rx_map[i] = slot; + rx_mapped |= 1 << slot; + } else + return -EINVAL; + } + + return 0; +} + +#ifdef CONFIG_PM +static int bf5xx_tdm_suspend(struct snd_soc_dai *dai) +{ + struct sport_device *sport = snd_soc_dai_get_drvdata(dai); + + if (dai->playback_active) + sport_tx_stop(sport); + if (dai->capture_active) + sport_rx_stop(sport); + + /* isolate sync/clock pins from codec while sports resume */ + peripheral_free_list(sport->pin_req); + + return 0; +} + +static int bf5xx_tdm_resume(struct snd_soc_dai *dai) +{ + int ret; + struct sport_device *sport = snd_soc_dai_get_drvdata(dai); + + ret = sport_set_multichannel(sport, 8, 0xFF, 1); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + } + + ret = sport_config_rx(sport, 0, 0x1F, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + } + + ret = sport_config_tx(sport, 0, 0x1F, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + } + + peripheral_request_list(sport->pin_req, "soc-audio"); + + return 0; +} + +#else +#define bf5xx_tdm_suspend NULL +#define bf5xx_tdm_resume NULL +#endif + +static struct snd_soc_dai_ops bf5xx_tdm_dai_ops = { + .hw_params = bf5xx_tdm_hw_params, + .set_fmt = bf5xx_tdm_set_dai_fmt, + .shutdown = bf5xx_tdm_shutdown, + .set_channel_map = bf5xx_tdm_set_channel_map, +}; + +static struct snd_soc_dai_driver bf5xx_tdm_dai = { + .suspend = bf5xx_tdm_suspend, + .resume = bf5xx_tdm_resume, + .playback = { + .channels_min = 2, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S32_LE,}, + .capture = { + .channels_min = 2, + .channels_max = 8, + .rates = SNDRV_PCM_RATE_48000, + .formats = SNDRV_PCM_FMTBIT_S32_LE,}, + .ops = &bf5xx_tdm_dai_ops, +}; + +static int __devinit bfin_tdm_probe(struct platform_device *pdev) +{ + struct sport_device *sport_handle; + int ret; + + /* configure SPORT for TDM */ + sport_handle = sport_init(pdev, 4, 8 * sizeof(u32), + sizeof(struct bf5xx_tdm_port)); + if (!sport_handle) + return -ENODEV; + + /* SPORT works in TDM mode */ + ret = sport_set_multichannel(sport_handle, 8, 0xFF, 1); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + goto sport_config_err; + } + + ret = sport_config_rx(sport_handle, 0, 0x1F, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + goto sport_config_err; + } + + ret = sport_config_tx(sport_handle, 0, 0x1F, 0, 0); + if (ret) { + pr_err("SPORT is busy!\n"); + ret = -EBUSY; + goto sport_config_err; + } + + ret = snd_soc_register_dai(&pdev->dev, &bf5xx_tdm_dai); + if (ret) { + pr_err("Failed to register DAI: %d\n", ret); + goto sport_config_err; + } + + return 0; + +sport_config_err: + sport_done(sport_handle); + return ret; +} + +static int __devexit bfin_tdm_remove(struct platform_device *pdev) +{ + struct sport_device *sport_handle = platform_get_drvdata(pdev); + + snd_soc_unregister_dai(&pdev->dev); + sport_done(sport_handle); + + return 0; +} + +static struct platform_driver bfin_tdm_driver = { + .probe = bfin_tdm_probe, + .remove = __devexit_p(bfin_tdm_remove), + .driver = { + .name = "bfin-tdm", + .owner = THIS_MODULE, + }, +}; + +static int __init bfin_tdm_init(void) +{ + return platform_driver_register(&bfin_tdm_driver); +} +module_init(bfin_tdm_init); + +static void __exit bfin_tdm_exit(void) +{ + platform_driver_unregister(&bfin_tdm_driver); +} +module_exit(bfin_tdm_exit); + +/* Module information */ +MODULE_AUTHOR("Barry Song"); +MODULE_DESCRIPTION("TDM driver for ADI Blackfin"); +MODULE_LICENSE("GPL"); + |