+++ /dev/null
-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);
projects / openwrt / staging / chunkeey.git / blobdiff