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openwrt_archive/target/linux/goldfish/patches-2.6.30/0120--ARM-goldfish-Add-audio-driver-for-goldfish.patch

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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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