From: Cliff Cai cliff.cai@analog.com
Signed-off-by: Cliff Cai cliff.cai@analog.com Signed-off-by: Bryan Wu cooloney@kernel.org --- sound/soc/blackfin/bf5xx-ac97.c | 407 +++++++++++++++++++++++++++++++++++++++ sound/soc/blackfin/bf5xx-ac97.h | 36 ++++ 2 files changed, 443 insertions(+), 0 deletions(-) create mode 100644 sound/soc/blackfin/bf5xx-ac97.c create mode 100644 sound/soc/blackfin/bf5xx-ac97.h
diff --git a/sound/soc/blackfin/bf5xx-ac97.c b/sound/soc/blackfin/bf5xx-ac97.c new file mode 100644 index 0000000..c782e31 --- /dev/null +++ b/sound/soc/blackfin/bf5xx-ac97.c @@ -0,0 +1,407 @@ +/* + * 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 <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" + +#if defined(CONFIG_BF54x) +#define PIN_REQ_SPORT_0 {P_SPORT0_TFS, P_SPORT0_DTPRI, P_SPORT0_TSCLK, \ + P_SPORT0_RFS, P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0} + +#define PIN_REQ_SPORT_1 {P_SPORT1_TFS, P_SPORT1_DTPRI, P_SPORT1_TSCLK, \ + P_SPORT1_RFS, P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0} + +#define PIN_REQ_SPORT_2 {P_SPORT2_TFS, P_SPORT2_DTPRI, P_SPORT2_TSCLK, \ + P_SPORT2_RFS, P_SPORT2_DRPRI, P_SPORT2_RSCLK, 0} + +#define PIN_REQ_SPORT_3 {P_SPORT3_TFS, P_SPORT3_DTPRI, P_SPORT3_TSCLK, \ + P_SPORT3_RFS, P_SPORT3_DRPRI, P_SPORT3_RSCLK, 0} +#else +#define PIN_REQ_SPORT_0 {P_SPORT0_DTPRI, P_SPORT0_TSCLK, P_SPORT0_RFS, \ + P_SPORT0_DRPRI, P_SPORT0_RSCLK, 0} + +#define PIN_REQ_SPORT_1 {P_SPORT1_DTPRI, P_SPORT1_TSCLK, P_SPORT1_RFS, \ + P_SPORT1_DRPRI, P_SPORT1_RSCLK, 0} +#endif + +static int *cmd_count; +static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM; + +#if defined(CONFIG_BF54x) +static struct sport_param sport_params[4] = { + { + .dma_rx_chan = CH_SPORT0_RX, + .dma_tx_chan = CH_SPORT0_TX, + .err_irq = IRQ_SPORT0_ERR, + .regs = (struct sport_register *)SPORT0_TCR1, + }, + { + .dma_rx_chan = CH_SPORT1_RX, + .dma_tx_chan = CH_SPORT1_TX, + .err_irq = IRQ_SPORT1_ERR, + .regs = (struct sport_register *)SPORT1_TCR1, + }, + { + .dma_rx_chan = CH_SPORT2_RX, + .dma_tx_chan = CH_SPORT2_TX, + .err_irq = IRQ_SPORT2_ERR, + .regs = (struct sport_register *)SPORT2_TCR1, + }, + { + .dma_rx_chan = CH_SPORT3_RX, + .dma_tx_chan = CH_SPORT3_TX, + .err_irq = IRQ_SPORT3_ERR, + .regs = (struct sport_register *)SPORT3_TCR1, + } +}; +#else +static struct sport_param sport_params[2] = { + { + .dma_rx_chan = CH_SPORT0_RX, + .dma_tx_chan = CH_SPORT0_TX, + .err_irq = IRQ_SPORT0_ERROR, + .regs = (struct sport_register *)SPORT0_TCR1, + }, + { + .dma_rx_chan = CH_SPORT1_RX, + .dma_tx_chan = CH_SPORT1_TX, + .err_irq = IRQ_SPORT1_ERROR, + .regs = (struct sport_register *)SPORT1_TCR1, + } +}; +#endif + +void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u32 *src, \ + size_t count) +{ + while (count--) { + dst->ac97_tag = TAG_VALID | TAG_PCM; + (dst++)->ac97_pcm = *src++; + } +} +EXPORT_SYMBOL(bf5xx_pcm_to_ac97); + +void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u32 *dst, \ + size_t count) +{ + while (count--) + *(dst++) = (src++)->ac97_pcm; +} +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 = sport_handle; + int nextfrag = sport_tx_curr_frag(sport); + struct ac97_frame *nextwrite; + + sport_incfrag(sport, &nextfrag, 1); + 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 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) +{ + 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) +{ +#if defined(CONFIG_BF54x) || defined(CONFIG_BF561) || \ + (defined(BF537_FAMILY) && (CONFIG_SND_BF5XX_SPORT_NUM == 1)) + +#define CONCAT(a, b, c) a ## b ## c +#define BFIN_SPORT_RFS(x) CONCAT(P_SPORT, x, _RFS) + + u16 per = BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM); + u16 gpio = P_IDENT(BFIN_SPORT_RFS(CONFIG_SND_BF5XX_SPORT_NUM)); + + pr_debug("%s enter\n", __func__); + + peripheral_free(per); + gpio_request(gpio, "bf5xx-ac97"); + gpio_direction_output(gpio, 1); + udelay(2); + gpio_set_value(gpio, 0); + udelay(1); + gpio_free(gpio); + peripheral_request(per, "soc-audio"); +#else + pr_info("%s: Not implemented\n", __func__); +#endif +} + +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 platform_device *pdev, + struct snd_soc_dai *dai) +{ + struct sport_device *sport = + (struct sport_device *)dai->private_data; + + 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 platform_device *pdev, + struct snd_soc_dai *dai) +{ + int ret; + struct sport_device *sport = + (struct sport_device *)dai->private_data; + + pr_debug("%s : sport %d\n", __func__, dai->id); + if (!dai->active) + return 0; + + ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1); + if (ret) { + pr_err("SPORT is busy!\n"); + return -EBUSY; + } + + ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1)); + if (ret) { + pr_err("SPORT is busy!\n"); + return -EBUSY; + } + + ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1)); + if (ret) { + pr_err("SPORT is busy!\n"); + return -EBUSY; + } + + if (dai->capture.active) + sport_rx_start(sport); + if (dai->playback.active) + sport_tx_start(sport); + return 0; +} + +#else +#define bf5xx_ac97_suspend NULL +#define bf5xx_ac97_resume NULL +#endif + +static int bf5xx_ac97_probe(struct platform_device *pdev, + struct snd_soc_dai *dai) +{ + int ret; +#if defined(CONFIG_BF54x) + u16 sport_req[][7] = {PIN_REQ_SPORT_0, PIN_REQ_SPORT_1, + PIN_REQ_SPORT_2, PIN_REQ_SPORT_3}; +#else + u16 sport_req[][7] = {PIN_REQ_SPORT_0, PIN_REQ_SPORT_1}; +#endif + cmd_count = (int *)get_zeroed_page(GFP_KERNEL); + if (cmd_count == NULL) + return -ENOMEM; + + if (peripheral_request_list(&sport_req[sport_num][0], "soc-audio")) { + pr_err("Requesting Peripherals failed\n"); + return -EFAULT; + } + +#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); + peripheral_free_list(&sport_req[sport_num][0]); + return -1; + } + gpio_direction_output(CONFIG_SND_BF5XX_RESET_GPIO_NUM, 1); +#endif + sport_handle = sport_init(&sport_params[sport_num], 2, \ + sizeof(struct ac97_frame), NULL); + if (!sport_handle) { + peripheral_free_list(&sport_req[sport_num][0]); +#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET + gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); +#endif + return -ENODEV; + } + /*SPORT works in TDM mode to simulate AC97 transfers*/ + ret = sport_set_multichannel(sport_handle, 16, 0x1F, 1); + if (ret) { + pr_err("SPORT is busy!\n"); + kfree(sport_handle); + peripheral_free_list(&sport_req[sport_num][0]); +#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET + gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); +#endif + return -EBUSY; + } + + ret = sport_config_rx(sport_handle, IRFS, 0xF, 0, (16*16-1)); + if (ret) { + pr_err("SPORT is busy!\n"); + kfree(sport_handle); + peripheral_free_list(&sport_req[sport_num][0]); +#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET + gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); +#endif + return -EBUSY; + } + + ret = sport_config_tx(sport_handle, ITFS, 0xF, 0, (16*16-1)); + if (ret) { + pr_err("SPORT is busy!\n"); + kfree(sport_handle); + peripheral_free_list(&sport_req[sport_num][0]); +#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET + gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); +#endif + return -EBUSY; + } + return 0; +} + +static void bf5xx_ac97_remove(struct platform_device *pdev, + struct snd_soc_dai *dai) +{ + free_page((unsigned long)cmd_count); + cmd_count = NULL; +#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET + gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM); +#endif +} + +struct snd_soc_dai bfin_ac97_dai = { + .name = "bf5xx-ac97", + .id = 0, + .type = SND_SOC_DAI_AC97, + .probe = bf5xx_ac97_probe, + .remove = bf5xx_ac97_remove, + .suspend = bf5xx_ac97_suspend, + .resume = bf5xx_ac97_resume, + .playback = { + .stream_name = "AC97 Playback", + .channels_min = 2, + .channels_max = 2, + .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, }, +}; +EXPORT_SYMBOL_GPL(bfin_ac97_dai); + +MODULE_AUTHOR("Roy Huang"); +MODULE_DESCRIPTION("AC97 driver for ADI Blackfin"); +MODULE_LICENSE("GPL"); diff --git a/sound/soc/blackfin/bf5xx-ac97.h b/sound/soc/blackfin/bf5xx-ac97.h new file mode 100644 index 0000000..3f77cc5 --- /dev/null +++ b/sound/soc/blackfin/bf5xx-ac97.h @@ -0,0 +1,36 @@ +/* + * linux/sound/arm/bf5xx-ac97.h + * + * 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. + */ + +#ifndef _BF5XX_AC97_H +#define _BF5XX_AC97_H + +extern struct snd_ac97_bus_ops bf5xx_ac97_ops; +extern struct snd_ac97 *ac97; +/* Frame format in memory, only support stereo currently */ +struct ac97_frame { + u16 ac97_tag; /* slot 0 */ + u16 ac97_addr; /* slot 1 */ + u16 ac97_data; /* slot 2 */ + u32 ac97_pcm; /* slot 3 and 4: left and right pcm data */ +} __attribute__ ((packed)); + +#define TAG_VALID 0x8000 +#define TAG_CMD 0x6000 +#define TAG_PCM_LEFT 0x1000 +#define TAG_PCM_RIGHT 0x0800 +#define TAG_PCM (TAG_PCM_LEFT | TAG_PCM_RIGHT) + +extern struct snd_soc_dai bfin_ac97_dai; + +void bf5xx_pcm_to_ac97(struct ac97_frame *dst, const __u32 *src, \ + size_t count); + +void bf5xx_ac97_to_pcm(const struct ac97_frame *src, __u32 *dst, \ + size_t count); + +#endif