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-rw-r--r--target/linux/goldfish/patches-2.6.30/0120--ARM-goldfish-Add-audio-driver-for-goldfish.patch404
1 files changed, 404 insertions, 0 deletions
diff --git a/target/linux/goldfish/patches-2.6.30/0120--ARM-goldfish-Add-audio-driver-for-goldfish.patch b/target/linux/goldfish/patches-2.6.30/0120--ARM-goldfish-Add-audio-driver-for-goldfish.patch
new file mode 100644
index 000000000..23f4b8f65
--- /dev/null
+++ b/target/linux/goldfish/patches-2.6.30/0120--ARM-goldfish-Add-audio-driver-for-goldfish.patch
@@ -0,0 +1,404 @@
+From aefe5257bf3ed9bf950ad962a63e5315566c2f97 Mon Sep 17 00:00:00 2001
+From: Mike Lockwood <lockwood@google.com>
+Date: Mon, 23 Jul 2007 09:31:54 -0400
+Subject: [PATCH 120/134] [ARM] goldfish: Add audio driver for goldfish.
+
+Signed-off-by: Mike A. Chan <mikechan@google.com>
+---
+ arch/arm/mach-goldfish/Makefile | 2 +-
+ arch/arm/mach-goldfish/audio.c | 379 +++++++++++++++++++++++++++++++++++++++
+ 2 files changed, 380 insertions(+), 1 deletions(-)
+ create mode 100644 arch/arm/mach-goldfish/audio.c
+
+--- a/arch/arm/mach-goldfish/Makefile
++++ b/arch/arm/mach-goldfish/Makefile
+@@ -4,6 +4,6 @@
+
+ # Object file lists.
+
+-obj-y := pdev_bus.o timer.o
++obj-y := pdev_bus.o timer.o audio.o
+ obj-$(CONFIG_MACH_GOLDFISH) += board-goldfish.o
+
+--- /dev/null
++++ b/arch/arm/mach-goldfish/audio.c
+@@ -0,0 +1,379 @@
++/* arch/arm/mach-goldfish/audio.c
++**
++** Copyright (C) 2007 Google, Inc.
++**
++** This software is licensed under the terms of the GNU General Public
++** License version 2, as published by the Free Software Foundation, and
++** may be copied, distributed, and modified under those terms.
++**
++** This program is distributed in the hope that it will be useful,
++** but WITHOUT ANY WARRANTY; without even the implied warranty of
++** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++** GNU General Public License for more details.
++**
++*/
++
++#include <linux/module.h>
++#include <linux/miscdevice.h>
++#include <linux/fs.h>
++#include <linux/platform_device.h>
++
++#include <linux/types.h>
++#include <linux/pci.h>
++#include <linux/interrupt.h>
++
++#include <asm/types.h>
++#include <asm/io.h>
++#include <asm/uaccess.h>
++
++
++MODULE_AUTHOR("Google, Inc.");
++MODULE_DESCRIPTION("Android QEMU Audio Driver");
++MODULE_LICENSE("GPL");
++MODULE_VERSION("1.0");
++
++struct goldfish_audio {
++ uint32_t reg_base;
++ int irq;
++ spinlock_t lock;
++ wait_queue_head_t wait;
++
++ char __iomem *buffer_virt; /* combined buffer virtual address */
++ unsigned long buffer_phys; /* combined buffer physical address */
++
++ char __iomem *write_buffer1; /* write buffer 1 virtual address */
++ char __iomem *write_buffer2; /* write buffer 2 virtual address */
++ char __iomem *read_buffer; /* read buffer virtual address */
++ int buffer_status;
++ int read_supported; /* true if we have audio input support */
++};
++
++/* We will allocate two read buffers and two write buffers.
++ Having two read buffers facilitate stereo -> mono conversion.
++ Having two write buffers facilitate interleaved IO.
++*/
++#define READ_BUFFER_SIZE 16384
++#define WRITE_BUFFER_SIZE 16384
++#define COMBINED_BUFFER_SIZE ((2 * READ_BUFFER_SIZE) + (2 * WRITE_BUFFER_SIZE))
++
++#define GOLDFISH_AUDIO_READ(data, addr) (readl(data->reg_base + addr))
++#define GOLDFISH_AUDIO_WRITE(data, addr, x) (writel(x, data->reg_base + addr))
++
++/* temporary variable used between goldfish_audio_probe() and goldfish_audio_open() */
++static struct goldfish_audio* audio_data;
++
++enum {
++ /* audio status register */
++ AUDIO_INT_STATUS = 0x00,
++ /* set this to enable IRQ */
++ AUDIO_INT_ENABLE = 0x04,
++ /* set these to specify buffer addresses */
++ AUDIO_SET_WRITE_BUFFER_1 = 0x08,
++ AUDIO_SET_WRITE_BUFFER_2 = 0x0C,
++ /* set number of bytes in buffer to write */
++ AUDIO_WRITE_BUFFER_1 = 0x10,
++ AUDIO_WRITE_BUFFER_2 = 0x14,
++
++ /* true if audio input is supported */
++ AUDIO_READ_SUPPORTED = 0x18,
++ /* buffer to use for audio input */
++ AUDIO_SET_READ_BUFFER = 0x1C,
++
++ /* driver writes number of bytes to read */
++ AUDIO_START_READ = 0x20,
++
++ /* number of bytes available in read buffer */
++ AUDIO_READ_BUFFER_AVAILABLE = 0x24,
++
++ /* AUDIO_INT_STATUS bits */
++
++ /* this bit set when it is safe to write more bytes to the buffer */
++ AUDIO_INT_WRITE_BUFFER_1_EMPTY = 1U << 0,
++ AUDIO_INT_WRITE_BUFFER_2_EMPTY = 1U << 1,
++ AUDIO_INT_READ_BUFFER_FULL = 1U << 2,
++
++ AUDIO_INT_MASK = AUDIO_INT_WRITE_BUFFER_1_EMPTY |
++ AUDIO_INT_WRITE_BUFFER_2_EMPTY |
++ AUDIO_INT_READ_BUFFER_FULL,
++};
++
++
++static atomic_t open_count = ATOMIC_INIT(0);
++
++
++static ssize_t goldfish_audio_read(struct file *fp, char __user *buf,
++ size_t count, loff_t *pos)
++{
++ struct goldfish_audio* data = fp->private_data;
++ int length;
++ int result = 0;
++
++ if (!data->read_supported)
++ return -ENODEV;
++
++ while (count > 0) {
++ length = (count > READ_BUFFER_SIZE ? READ_BUFFER_SIZE : count);
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_START_READ, length);
++
++ wait_event_interruptible(data->wait, (data->buffer_status & AUDIO_INT_READ_BUFFER_FULL));
++
++ length = GOLDFISH_AUDIO_READ(data, AUDIO_READ_BUFFER_AVAILABLE);
++
++ /* copy data to user space */
++ if (copy_to_user(buf, data->read_buffer, length))
++ {
++ printk("copy_from_user failed!\n");
++ return -EFAULT;
++ }
++
++ result += length;
++ buf += length;
++ count -= length;
++ }
++
++ return result;
++}
++
++static ssize_t goldfish_audio_write(struct file *fp, const char __user *buf,
++ size_t count, loff_t *pos)
++{
++ struct goldfish_audio* data = fp->private_data;
++ unsigned long irq_flags;
++ ssize_t result = 0;
++ char __iomem *kbuf;
++
++ while (count > 0)
++ {
++ ssize_t copy = count;
++ if (copy > WRITE_BUFFER_SIZE)
++ copy = WRITE_BUFFER_SIZE;
++ wait_event_interruptible(data->wait,
++ (data->buffer_status & (AUDIO_INT_WRITE_BUFFER_1_EMPTY | AUDIO_INT_WRITE_BUFFER_2_EMPTY)));
++
++ if ((data->buffer_status & AUDIO_INT_WRITE_BUFFER_1_EMPTY) != 0) {
++ kbuf = data->write_buffer1;
++ } else {
++ kbuf = data->write_buffer2;
++ }
++
++ /* copy from user space to the appropriate buffer */
++ if (copy_from_user(kbuf, buf, copy))
++ {
++ printk("copy_from_user failed!\n");
++ result = -EFAULT;
++ break;
++ }
++ else
++ {
++ spin_lock_irqsave(&data->lock, irq_flags);
++
++ /* clear the buffer empty flag, and signal the emulator to start writing the buffer */
++ if (kbuf == data->write_buffer1) {
++ data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_1_EMPTY;
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_WRITE_BUFFER_1, copy);
++ } else {
++ data->buffer_status &= ~AUDIO_INT_WRITE_BUFFER_2_EMPTY;
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_WRITE_BUFFER_2, copy);
++ }
++
++ spin_unlock_irqrestore(&data->lock, irq_flags);
++ }
++
++ buf += copy;
++ result += copy;
++ count -= copy;
++ }
++
++ return result;
++}
++
++static int goldfish_audio_open(struct inode *ip, struct file *fp)
++{
++ if (!audio_data)
++ return -ENODEV;
++
++ if (atomic_inc_return(&open_count) == 1)
++ {
++ fp->private_data = audio_data;
++ audio_data->buffer_status = (AUDIO_INT_WRITE_BUFFER_1_EMPTY | AUDIO_INT_WRITE_BUFFER_2_EMPTY);
++ GOLDFISH_AUDIO_WRITE(audio_data, AUDIO_INT_ENABLE, AUDIO_INT_MASK);
++ return 0;
++ }
++ else
++ {
++ atomic_dec(&open_count);
++ return -EBUSY;
++ }
++}
++
++static int goldfish_audio_release(struct inode *ip, struct file* fp)
++{
++ atomic_dec(&open_count);
++ GOLDFISH_AUDIO_WRITE(audio_data, AUDIO_INT_ENABLE, 0);
++ return 0;
++}
++
++static int goldfish_audio_ioctl(struct inode* ip, struct file* fp, unsigned int cmd, unsigned long arg)
++{
++ /* temporary workaround, until we switch to the ALSA API */
++ if (cmd == 315)
++ return -1;
++ else
++ return 0;
++}
++
++static irqreturn_t
++goldfish_audio_interrupt(int irq, void *dev_id)
++{
++ unsigned long irq_flags;
++ struct goldfish_audio *data = dev_id;
++ uint32_t status;
++
++ spin_lock_irqsave(&data->lock, irq_flags);
++
++ /* read buffer status flags */
++ status = GOLDFISH_AUDIO_READ(data, AUDIO_INT_STATUS);
++ status &= AUDIO_INT_MASK;
++ /* if buffers are newly empty, wake up blocked goldfish_audio_write() call */
++ if(status) {
++ data->buffer_status = status;
++ wake_up(&data->wait);
++ }
++
++ spin_unlock_irqrestore(&data->lock, irq_flags);
++ return status ? IRQ_HANDLED : IRQ_NONE;
++}
++
++/* file operations for /dev/eac */
++static struct file_operations goldfish_audio_fops = {
++ .owner = THIS_MODULE,
++ .read = goldfish_audio_read,
++ .write = goldfish_audio_write,
++ .open = goldfish_audio_open,
++ .release = goldfish_audio_release,
++ .ioctl = goldfish_audio_ioctl,
++
++};
++
++static struct miscdevice goldfish_audio_device = {
++ .minor = MISC_DYNAMIC_MINOR,
++ .name = "eac",
++ .fops = &goldfish_audio_fops,
++};
++
++static int goldfish_audio_probe(struct platform_device *pdev)
++{
++ int ret;
++ struct resource *r;
++ struct goldfish_audio *data;
++ dma_addr_t buf_addr;
++
++printk("goldfish_audio_probe\n");
++ data = kzalloc(sizeof(*data), GFP_KERNEL);
++ if(data == NULL) {
++ ret = -ENOMEM;
++ goto err_data_alloc_failed;
++ }
++ spin_lock_init(&data->lock);
++ init_waitqueue_head(&data->wait);
++ platform_set_drvdata(pdev, data);
++
++ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if(r == NULL) {
++ printk("platform_get_resource failed\n");
++ ret = -ENODEV;
++ goto err_no_io_base;
++ }
++ data->reg_base = IO_ADDRESS(r->start - IO_START);
++
++ data->irq = platform_get_irq(pdev, 0);
++ if(data->irq < 0) {
++ printk("platform_get_irq failed\n");
++ ret = -ENODEV;
++ goto err_no_irq;
++ }
++
++ data->buffer_virt = dma_alloc_writecombine(&pdev->dev, COMBINED_BUFFER_SIZE,
++ &buf_addr, GFP_KERNEL);
++ if(data->buffer_virt == 0) {
++ ret = -ENOMEM;
++ goto err_alloc_write_buffer_failed;
++ }
++ data->buffer_phys = buf_addr;
++ data->write_buffer1 = data->buffer_virt;
++ data->write_buffer2 = data->buffer_virt + WRITE_BUFFER_SIZE;
++ data->read_buffer = data->buffer_virt + 2 * WRITE_BUFFER_SIZE;
++
++ ret = request_irq(data->irq, goldfish_audio_interrupt, IRQF_SHARED, pdev->name, data);
++ if(ret)
++ goto err_request_irq_failed;
++
++ if((ret = misc_register(&goldfish_audio_device)))
++ {
++ printk("misc_register returned %d in goldfish_audio_init\n", ret);
++ goto err_misc_register_failed;
++ }
++
++
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_1, buf_addr);
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_SET_WRITE_BUFFER_2, buf_addr + WRITE_BUFFER_SIZE);
++
++ data->read_supported = GOLDFISH_AUDIO_READ(data, AUDIO_READ_SUPPORTED);
++ if (data->read_supported)
++ GOLDFISH_AUDIO_WRITE(data, AUDIO_SET_READ_BUFFER, buf_addr + 2 * WRITE_BUFFER_SIZE);
++
++ audio_data = data;
++ return 0;
++
++err_misc_register_failed:
++err_request_irq_failed:
++ dma_free_writecombine(&pdev->dev, COMBINED_BUFFER_SIZE, data->buffer_virt, data->buffer_phys);
++err_alloc_write_buffer_failed:
++err_no_irq:
++err_no_io_base:
++ kfree(data);
++err_data_alloc_failed:
++ return ret;
++}
++
++static int goldfish_audio_remove(struct platform_device *pdev)
++{
++ struct goldfish_audio *data = platform_get_drvdata(pdev);
++
++ misc_deregister(&goldfish_audio_device);
++ free_irq(data->irq, data);
++ dma_free_writecombine(&pdev->dev, COMBINED_BUFFER_SIZE, data->buffer_virt, data->buffer_phys);
++ kfree(data);
++ audio_data = NULL;
++ return 0;
++}
++
++static struct platform_driver goldfish_audio_driver = {
++ .probe = goldfish_audio_probe,
++ .remove = goldfish_audio_remove,
++ .driver = {
++ .name = "goldfish_audio"
++ }
++};
++
++static int __init goldfish_audio_init(void)
++{
++ int ret;
++
++ ret = platform_driver_register(&goldfish_audio_driver);
++ if (ret < 0)
++ {
++ printk("platform_driver_register returned %d\n", ret);
++ return ret;
++ }
++
++ return ret;
++}
++
++static void __exit goldfish_audio_exit(void)
++{
++ platform_driver_unregister(&goldfish_audio_driver);
++}
++
++module_init(goldfish_audio_init);
++module_exit(goldfish_audio_exit);
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