sound: ASoC: Blackfin: AC97 Blackfin CPU DAI driver

Signed-off-by: Cliff Cai <cliff.cai@analog.com>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>

2 files changed, 443 insertions, 0 deletions

diff --git a/sound/soc/blackfin/bf5xx-ac97.c b/sound/soc/blackfin/bf5xx-ac97.c
new file mode 100644
index 000000000000..c782e311fd56
--- /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 000000000000..3f77cc558dc0
--- /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