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Subject[PATCH 4/9] ASoC: Blackfin: AC97 Blackfin CPU DAI driver
Date
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
--
1.5.6

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