/* * bf5xx-ac97.c -- AC97 support for the ADI blackfin chip. * * Author: Roy Huang * Created: 11th. June 2007 * Copyright: Analog Device Inc. * * 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/init.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/wait.h> #include <linux/delay.h> #include <linux/slab.h> #include <sound/core.h> #include <sound/pcm.h> #include <sound/ac97_codec.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-ac97.h" /* Anomaly notes: * 05000250 - AD1980 is running in TDM mode and RFS/TFS are generated by SPORT * contrtoller. But, RFSDIV and TFSDIV are always set to 16*16-1, * while the max AC97 data size is 13*16. The DIV is always larger * than data size. AD73311 and ad2602 are not running in TDM mode. * AD1836 and AD73322 depend on external RFS/TFS only. So, this * anomaly does not affect blackfin sound drivers. */ static struct sport_device *ac97_sport_handle; void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u16 *src, size_t count, unsigned int chan_mask) { while (count--) { dst->ac97_tag = TAG_VALID; if (chan_mask & SP_FL) { dst->ac97_pcm_r = *src++; dst->ac97_tag |= TAG_PCM_RIGHT; } if (chan_mask & SP_FR) { dst->ac97_pcm_l = *src++; dst->ac97_tag |= TAG_PCM_LEFT; } #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT) if (chan_mask & SP_SR) { dst->ac97_sl = *src++; dst->ac97_tag |= TAG_PCM_SL; } if (chan_mask & SP_SL) { dst->ac97_sr = *src++; dst->ac97_tag |= TAG_PCM_SR; } if (chan_mask & SP_LFE) { dst->ac97_lfe = *src++; dst->ac97_tag |= TAG_PCM_LFE; } if (chan_mask & SP_FC) { dst->ac97_center = *src++; dst->ac97_tag |= TAG_PCM_CENTER; } #endif dst++; } } EXPORT_SYMBOL(bf5xx_pcm_to_ac97); void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u16 *dst, size_t count) { while (count--) { *(dst++) = src->ac97_pcm_l; *(dst++) = src->ac97_pcm_r; src++; } } EXPORT_SYMBOL(bf5xx_ac97_to_pcm); static unsigned int sport_tx_curr_frag(struct sport_device *sport) { return sport->tx_curr_frag = sport_curr_offset_tx(sport) / sport->tx_fragsize; } static void enqueue_cmd(struct snd_ac97 *ac97, __u16 addr, __u16 data) { struct sport_device *sport = ac97_sport_handle; int *cmd_count = sport->private_data; int nextfrag = sport_tx_curr_frag(sport); struct ac97_frame *nextwrite; sport_incfrag(sport, &nextfrag, 1); nextwrite = (struct ac97_frame *)(sport->tx_buf + nextfrag * sport->tx_fragsize); pr_debug("sport->tx_buf:%p, nextfrag:0x%x nextwrite:%p, cmd_count:%d\n", sport->tx_buf, nextfrag, nextwrite, cmd_count[nextfrag]); nextwrite[cmd_count[nextfrag]].ac97_tag |= TAG_CMD; nextwrite[cmd_count[nextfrag]].ac97_addr = addr; nextwrite[cmd_count[nextfrag]].ac97_data = data; ++cmd_count[nextfrag]; pr_debug("ac97_sport: Inserting %02x/%04x into fragment %d\n", addr >> 8, data, nextfrag); } static unsigned short bf5xx_ac97_read(struct snd_ac97 *ac97, unsigned short reg) { struct sport_device *sport_handle = ac97_sport_handle; struct ac97_frame out_frame[2], in_frame[2]; pr_debug("%s enter 0x%x\n", __func__, reg); /* When dma descriptor is enabled, the register should not be read */ if (sport_handle->tx_run || sport_handle->rx_run) { pr_err("Could you send a mail to cliff.cai@analog.com " "to report this?\n"); return -EFAULT; } memset(&out_frame, 0, 2 * sizeof(struct ac97_frame)); memset(&in_frame, 0, 2 * sizeof(struct ac97_frame)); out_frame[0].ac97_tag = TAG_VALID | TAG_CMD; out_frame[0].ac97_addr = ((reg << 8) | 0x8000); sport_send_and_recv(sport_handle, (unsigned char *)&out_frame, (unsigned char *)&in_frame, 2 * sizeof(struct ac97_frame)); return in_frame[1].ac97_data; } void bf5xx_ac97_write(struct snd_ac97 *ac97, unsigned short reg, unsigned short val) { struct sport_device *sport_handle = ac97_sport_handle; pr_debug("%s enter 0x%x:0x%04x\n", __func__, reg, val); if (sport_handle->tx_run) { enqueue_cmd(ac97, (reg << 8), val); /* write */ enqueue_cmd(ac97, (reg << 8) | 0x8000, 0); /* read back */ } else { struct ac97_frame frame; memset(&frame, 0, sizeof(struct ac97_frame)); frame.ac97_tag = TAG_VALID | TAG_CMD; frame.ac97_addr = (reg << 8); frame.ac97_data = val; sport_send_and_recv(sport_handle, (unsigned char *)&frame, \ NULL, sizeof(struct ac97_frame)); } } static void bf5xx_ac97_warm_reset(struct snd_ac97 *ac97) { struct sport_device *sport_handle = ac97_sport_handle; u16 gpio = P_IDENT(sport_handle->pin_req[3]); pr_debug("%s enter\n", __func__); peripheral_free_list(sport_handle->pin_req); gpio_request(gpio, "bf5xx-ac97"); gpio_direction_output(gpio, 1); udelay(2); gpio_set_value(gpio, 0); udelay(1); gpio_free(gpio); peripheral_request_list(sport_handle->pin_req, "soc-audio"); } static void bf5xx_ac97_cold_reset(struct snd_ac97 *ac97) { #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET pr_debug("%s enter\n", __func__); /* It is specified for bf548-ezkit */ gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 0); /* Keep reset pin low for 1 ms */ mdelay(1); gpio_set_value(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1); /* Wait for bit clock recover */ mdelay(1); #else pr_info("%s: Not implemented\n", __func__); #endif } struct snd_ac97_bus_ops soc_ac97_ops = { .read = bf5xx_ac97_read, .write = bf5xx_ac97_write, .warm_reset = bf5xx_ac97_warm_reset, .reset = bf5xx_ac97_cold_reset, }; EXPORT_SYMBOL_GPL(soc_ac97_ops); #ifdef CONFIG_PM static int bf5xx_ac97_suspend(struct snd_soc_dai *dai) { struct sport_device *sport = snd_soc_dai_get_drvdata(dai); pr_debug("%s : sport %d\n", __func__, dai->id); if (!dai->active) return 0; if (dai->capture_active) sport_rx_stop(sport); if (dai->playback_active) sport_tx_stop(sport); return 0; } static int bf5xx_ac97_resume(struct snd_soc_dai *dai) { int ret; struct sport_device *sport = snd_soc_dai_get_drvdata(dai); pr_debug("%s : sport %d\n", __func__, dai->id); if (!dai->active) return 0; #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT) ret = sport_set_multichannel(sport, 16, 0x3FF, 1); #else ret = sport_set_multichannel(sport, 16, 0x1F, 1); #endif if (ret) { pr_err("SPORT is busy!\n"); return -EBUSY; } ret = sport_config_rx(sport, IRFS, 0xF, 0, (16*16-1)); if (ret) { pr_err("SPORT is busy!\n"); return -EBUSY; } ret = sport_config_tx(sport, ITFS, 0xF, 0, (16*16-1)); if (ret) { pr_err("SPORT is busy!\n"); return -EBUSY; } return 0; } #else #define bf5xx_ac97_suspend NULL #define bf5xx_ac97_resume NULL #endif static struct snd_soc_dai_driver bfin_ac97_dai = { .ac97_control = 1, .suspend = bf5xx_ac97_suspend, .resume = bf5xx_ac97_resume, .playback = { .stream_name = "AC97 Playback", .channels_min = 2, #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT) .channels_max = 6, #else .channels_max = 2, #endif .rates = SNDRV_PCM_RATE_48000, .formats = SNDRV_PCM_FMTBIT_S16_LE, }, .capture = { .stream_name = "AC97 Capture", .channels_min = 2, .channels_max = 2, .rates = SNDRV_PCM_RATE_48000, .formats = SNDRV_PCM_FMTBIT_S16_LE, }, }; static const struct snd_soc_component_driver bfin_ac97_component = { .name = "bfin-ac97", }; static int asoc_bfin_ac97_probe(struct platform_device *pdev) { struct sport_device *sport_handle; int ret; #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET /* Request PB3 as reset pin */ if (gpio_request(CONFIG_SND_BF5XX_RESET_GPIO_NUM, "SND_AD198x RESET")) { pr_err("Failed to request GPIO_%d for reset\n", CONFIG_SND_BF5XX_RESET_GPIO_NUM); ret = -1; goto gpio_err; } gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1); #endif sport_handle = sport_init(pdev, 2, sizeof(struct ac97_frame), PAGE_SIZE); if (!sport_handle) { ret = -ENODEV; goto sport_err; } /*SPORT works in TDM mode to simulate AC97 transfers*/ #if defined(CONFIG_SND_BF5XX_MULTICHAN_SUPPORT) ret = sport_set_multichannel(sport_handle, 16, 0x3FF, 1); #else ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1); #endif if (ret) { pr_err("SPORT is busy!\n"); ret = -EBUSY; goto sport_config_err; } ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1)); if (ret) { pr_err("SPORT is busy!\n"); ret = -EBUSY; goto sport_config_err; } ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1)); if (ret) { pr_err("SPORT is busy!\n"); ret = -EBUSY; goto sport_config_err; } ret = snd_soc_register_component(&pdev->dev, &bfin_ac97_component, &bfin_ac97_dai, 1); if (ret) { pr_err("Failed to register DAI: %d\n", ret); goto sport_config_err; } ac97_sport_handle = sport_handle; return 0; sport_config_err: sport_done(sport_handle); sport_err: #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); gpio_err: #endif return ret; } static int asoc_bfin_ac97_remove(struct platform_device *pdev) { struct sport_device *sport_handle = platform_get_drvdata(pdev); snd_soc_unregister_component(&pdev->dev); sport_done(sport_handle); #ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); #endif return 0; } static struct platform_driver asoc_bfin_ac97_driver = { .driver = { .name = "bfin-ac97", .owner = THIS_MODULE, }, .probe = asoc_bfin_ac97_probe, .remove = asoc_bfin_ac97_remove, }; module_platform_driver(asoc_bfin_ac97_driver); MODULE_AUTHOR("Roy Huang"); MODULE_DESCRIPTION("AC97 driver for ADI Blackfin"); MODULE_LICENSE("GPL");