/*
* 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 int *cmd_count;
static int sport_num = CONFIG_SND_BF5XX_SPORT_NUM;
#define SPORT_REQ(x) \
[x] = {P_SPORT##x##_TFS, P_SPORT##x##_DTPRI, P_SPORT##x##_TSCLK, \
P_SPORT##x##_RFS, P_SPORT##x##_DRPRI, P_SPORT##x##_RSCLK, 0}
static u16 sport_req[][7] = {
#ifdef SPORT0_TCR1
SPORT_REQ(0),
#endif
#ifdef SPORT1_TCR1
SPORT_REQ(1),
#endif
#ifdef SPORT2_TCR1
SPORT_REQ(2),
#endif
#ifdef SPORT3_TCR1
SPORT_REQ(3),
#endif
};
#define SPORT_PARAMS(x) \
[x] = { \
.dma_rx_chan = CH_SPORT##x##_RX, \
.dma_tx_chan = CH_SPORT##x##_TX, \
.err_irq = IRQ_SPORT##x##_ERROR, \
.regs = (struct sport_register *)SPORT##x##_TCR1, \
}
static struct sport_param sport_params[4] = {
#ifdef SPORT0_TCR1
SPORT_PARAMS(0),
#endif
#ifdef SPORT1_TCR1
SPORT_PARAMS(1),
#endif
#ifdef SPORT2_TCR1
SPORT_PARAMS(2),
#endif
#ifdef SPORT3_TCR1
SPORT_PARAMS(3),
#endif
};
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 = sport_handle;
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 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 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 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;
#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 int bf5xx_ac97_probe(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
int ret = 0;
cmd_count = (int *)get_zeroed_page(GFP_KERNEL);
if (cmd_count == NULL)
return -ENOMEM;
if (peripheral_request_list(sport_req[sport_num], "soc-audio")) {
pr_err("Requesting Peripherals failed\n");
ret = -EFAULT;
goto peripheral_err;
}
#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(&sport_params[sport_num], 2, \
sizeof(struct ac97_frame), NULL);
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;
}
return 0;
sport_config_err:
kfree(sport_handle);
sport_err:
#ifdef CONFIG_SND_BF5XX_HAVE_COLD_RESET
gpio_free(CONFIG_SND_BF5XX_RESET_GPIO_NUM);
gpio_err:
#endif
peripheral_free_list(sport_req[sport_num]);
peripheral_err:
free_page((unsigned long)cmd_count);
cmd_count = NULL;
return ret;
}
static void bf5xx_ac97_remove(struct platform_device *pdev,
struct snd_soc_dai *dai)
{
free_page((unsigned long)cmd_count);
cmd_count = NULL;
peripheral_free_list(sport_req[sport_num]);
#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,
.ac97_control = 1,
.probe = bf5xx_ac97_probe,
.remove = bf5xx_ac97_remove,
.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, },
};
EXPORT_SYMBOL_GPL(bfin_ac97_dai);
static int __init bfin_ac97_init(void)
{
return snd_soc_register_dai(&bfin_ac97_dai);
}
module_init(bfin_ac97_init);
static void __exit bfin_ac97_exit(void)
{
snd_soc_unregister_dai(&bfin_ac97_dai);
}
module_exit(bfin_ac97_exit);
MODULE_AUTHOR("Roy Huang");
MODULE_DESCRIPTION("AC97 driver for ADI Blackfin");
MODULE_LICENSE("GPL");
