static long
pxa3xx_gcu_misc_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
unsigned long flags;
struct pxa3xx_gcu_priv *priv = file_dev(file);
switch (cmd) {
case PXA3XX_GCU_IOCTL_RESET:
spin_lock_irqsave(&priv->spinlock, flags);
pxa3xx_gcu_reset(priv);
spin_unlock_irqrestore(&priv->spinlock, flags);
return 0;
case PXA3XX_GCU_IOCTL_WAIT_IDLE:
return pxa3xx_gcu_wait_idle(priv);
}
return -ENOSYS;
}
static int __devinit
pxa3xx_gcu_probe(struct platform_device *dev)
{
int i, ret, irq;
struct resource *r;
struct pxa3xx_gcu_priv *priv;
priv = kzalloc(sizeof(struct pxa3xx_gcu_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
for (i = 0; i < 8; i++) {
ret = add_buffer(dev, priv);
if (ret) {
dev_err(&dev->dev, "failed to allocate DMA memory\n");
goto err_free_priv;
}
}
init_waitqueue_head(&priv->wait_idle);
init_waitqueue_head(&priv->wait_free);
spin_lock_init(&priv->spinlock);
/* we allocate the misc device structure as part of our own allocation,
* so we can get a pointer to our priv structure later on with
* container_of(). This isn't really necessary as we have a fixed minor
* number anyway, but this is to avoid statics. */
priv->misc_fops.owner = THIS_MODULE;
priv->misc_fops.write = pxa3xx_gcu_misc_write;
priv->misc_fops.unlocked_ioctl = pxa3xx_gcu_misc_ioctl;
priv->misc_fops.mmap = pxa3xx_gcu_misc_mmap;
priv->misc_dev.minor = MISCDEV_MINOR,
priv->misc_dev.name = DRV_NAME,
priv->misc_dev.fops = &priv->misc_fops,
/* register misc device */
ret = misc_register(&priv->misc_dev);
if (ret < 0) {
dev_err(&dev->dev, "misc_register() for minor %d failed\n",
MISCDEV_MINOR);
goto err_free_priv;
}
/* handle IO resources */
r = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (r == NULL) {
dev_err(&dev->dev, "no I/O memory resource defined\n");
ret = -ENODEV;
goto err_misc_deregister;
}
if (!request_mem_region(r->start, resource_size(r), dev->name)) {
dev_err(&dev->dev, "failed to request I/O memory\n");
ret = -EBUSY;
goto err_misc_deregister;
}
priv->mmio_base = ioremap_nocache(r->start, resource_size(r));
if (!priv->mmio_base) {
dev_err(&dev->dev, "failed to map I/O memory\n");
ret = -EBUSY;
goto err_free_mem_region;
}
/* allocate dma memory */
priv->shared = dma_alloc_coherent(&dev->dev, SHARED_SIZE,
&priv->shared_phys, GFP_KERNEL);
if (!priv->shared) {
dev_err(&dev->dev, "failed to allocate DMA memory\n");
ret = -ENOMEM;
goto err_free_io;
}
/* enable the clock */
priv->clk = clk_get(&dev->dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(&dev->dev, "failed to get clock\n");
ret = -ENODEV;
goto err_free_dma;
}
ret = clk_enable(priv->clk);
if (ret < 0) {
dev_err(&dev->dev, "failed to enable clock\n");
goto err_put_clk;
}
/* request the IRQ */
irq = platform_get_irq(dev, 0);
if (irq < 0) {
dev_err(&dev->dev, "no IRQ defined\n");
ret = -ENODEV;
goto err_put_clk;
}
ret = request_irq(irq, pxa3xx_gcu_handle_irq,
0, DRV_NAME, priv);
if (ret) {
dev_err(&dev->dev, "request_irq failed\n");
ret = -EBUSY;
goto err_put_clk;
}
platform_set_drvdata(dev, priv);
priv->resource_mem = r;
pxa3xx_gcu_reset(priv);
pxa3xx_gcu_init_debug_timer();
dev_info(&dev->dev, "registered @0x%p, DMA 0x%p (%d bytes), IRQ %d\n",
(void *) r->start, (void *) priv->shared_phys,
SHARED_SIZE, irq);
return 0;
err_put_clk:
clk_disable(priv->clk);
clk_put(priv->clk);
err_free_dma:
dma_free_coherent(&dev->dev, SHARED_SIZE,
priv->shared, priv->shared_phys);
err_free_io:
iounmap(priv->mmio_base);
err_free_mem_region:
release_mem_region(r->start, resource_size(r));
err_misc_deregister:
misc_deregister(&priv->misc_dev);
err_free_priv:
platform_set_drvdata(dev, NULL);
free_buffers(dev, priv);
kfree(priv);
return ret;
}
static int pxa3xx_gcu_probe(struct platform_device *pdev)
{
int i, ret, irq;
struct resource *r;
struct pxa3xx_gcu_priv *priv;
struct device *dev = &pdev->dev;
priv = devm_kzalloc(dev, sizeof(struct pxa3xx_gcu_priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
init_waitqueue_head(&priv->wait_idle);
init_waitqueue_head(&priv->wait_free);
spin_lock_init(&priv->spinlock);
/* we allocate the misc device structure as part of our own allocation,
* so we can get a pointer to our priv structure later on with
* container_of(). This isn't really necessary as we have a fixed minor
* number anyway, but this is to avoid statics. */
priv->misc_dev.minor = MISCDEV_MINOR,
priv->misc_dev.name = DRV_NAME,
priv->misc_dev.fops = &pxa3xx_gcu_miscdev_fops;
/* handle IO resources */
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
priv->mmio_base = devm_request_and_ioremap(dev, r);
if (IS_ERR(priv->mmio_base)) {
dev_err(dev, "failed to map I/O memory\n");
return PTR_ERR(priv->mmio_base);
}
/* enable the clock */
priv->clk = devm_clk_get(dev, NULL);
if (IS_ERR(priv->clk)) {
dev_err(dev, "failed to get clock\n");
return PTR_ERR(priv->clk);
}
/* request the IRQ */
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(dev, "no IRQ defined\n");
return -ENODEV;
}
ret = devm_request_irq(dev, irq, pxa3xx_gcu_handle_irq,
0, DRV_NAME, priv);
if (ret < 0) {
dev_err(dev, "request_irq failed\n");
return ret;
}
/* allocate dma memory */
priv->shared = dma_alloc_coherent(dev, SHARED_SIZE,
&priv->shared_phys, GFP_KERNEL);
if (!priv->shared) {
dev_err(dev, "failed to allocate DMA memory\n");
return -ENOMEM;
}
/* register misc device */
ret = misc_register(&priv->misc_dev);
if (ret < 0) {
dev_err(dev, "misc_register() for minor %d failed\n",
MISCDEV_MINOR);
goto err_free_dma;
}
ret = clk_enable(priv->clk);
if (ret < 0) {
dev_err(dev, "failed to enable clock\n");
goto err_misc_deregister;
}
for (i = 0; i < 8; i++) {
ret = pxa3xx_gcu_add_buffer(dev, priv);
if (ret) {
dev_err(dev, "failed to allocate DMA memory\n");
goto err_disable_clk;
}
}
platform_set_drvdata(pdev, priv);
priv->resource_mem = r;
pxa3xx_gcu_reset(priv);
pxa3xx_gcu_init_debug_timer();
dev_info(dev, "registered @0x%p, DMA 0x%p (%d bytes), IRQ %d\n",
(void *) r->start, (void *) priv->shared_phys,
SHARED_SIZE, irq);
return 0;
err_free_dma:
dma_free_coherent(dev, SHARED_SIZE,
priv->shared, priv->shared_phys);
err_misc_deregister:
misc_deregister(&priv->misc_dev);
err_disable_clk:
clk_disable(priv->clk);
return ret;
}