add the 'goldfish' target, useful for experimenting with virtual phone hardware (includes the emulator)

SVN-Revision: 16459

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 0000000000..23f4b8f659
--- /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);