linux/drivers/mxc/vpu/mxc_vpu.c File Reference

VPU system initialization and file operation implementation. More...

Functions
static int	vpu_alloc_dma_buffer (struct vpu_mem_desc *mem)
static void	vpu_free_dma_buffer (struct vpu_mem_desc *mem)
static int	vpu_free_buffers (void)
static irqreturn_t	vpu_ipi_irq_handler (int irq, void *dev_id)
bool	vpu_is_valid_phy_memory (u32 paddr)
static int	vpu_open (struct inode *inode, struct file *filp)
static long	vpu_ioctl (struct file *filp, u_int cmd, u_long arg)
static int	vpu_release (struct inode *inode, struct file *filp)
static int	vpu_fasync (int fd, struct file *filp, int mode)
static int	vpu_map_hwregs (struct file *fp, struct vm_area_struct *vm)
static int	vpu_map_dma_mem (struct file *fp, struct vm_area_struct *vm)
static int	vpu_mmap (struct file *fp, struct vm_area_struct *vm)
static int	vpu_dev_probe (struct platform_device *pdev)
Variables
static struct platform_driver	mxcvpu_driver

---

Detailed Description

VPU system initialization and file operation implementation.

---

Function Documentation

static int vpu_alloc_dma_buffer

(

struct vpu_mem_desc *

mem

)

[static]

Private function to alloc dma buffer

Returns:

status 0 success.

Referenced by vpu_ioctl().

static int vpu_dev_probe

(

struct platform_device *

pdev

)

[static]

This function is called by the driver framework to initialize the vpu device.

Parameters:

dev

The device structure for the vpu passed in by the framework.

Returns:

0 on success or negative error code on error

References vpu_ipi_irq_handler().

static int vpu_fasync	(	int	fd,
		struct file *	filp,
		int	mode
	)			[static]

fasync function for vpu file operation

Returns:

0 on success or negative error code on error

static int vpu_free_buffers

(

void

)

[static]

Private function to free buffers

Returns:

status 0 success.

References vpu_free_dma_buffer().

Referenced by vpu_release().

static void vpu_free_dma_buffer

(

struct vpu_mem_desc *

mem

)

[static]

Private function to free dma buffer

Referenced by vpu_free_buffers(), vpu_ioctl(), and vpu_release().

static long vpu_ioctl	(	struct file *	filp,
		u_int	cmd,
		u_long	arg
	)			[static]

IO ctrl function for vpu file operation.

Parameters:

cmd

IO ctrl command

Returns:

0 on success or negative error code on error

References vpu_alloc_dma_buffer(), vpu_free_dma_buffer(), and vpu_is_valid_phy_memory().

static irqreturn_t vpu_ipi_irq_handler	(	int	irq,
		void *	dev_id
	)			[static]

vpu interrupt handler

References IRQ_HANDLED.

Referenced by vpu_dev_probe().

bool vpu_is_valid_phy_memory

(

u32

paddr

)

vpu jpu interrupt handler

check phy memory prepare to pass to vpu is valid or not, we already address some issue that if pass a wrong address to vpu (like virtual address), system will hang.

Returns:

true return is a valid phy memory address, false return not.

Referenced by vpu_ioctl().

static int vpu_map_dma_mem	(	struct file *	fp,
		struct vm_area_struct *	vm
	)			[static]

memory map function of memory for vpu file operation

Returns:

0 on success or negative error code on error

Referenced by vpu_mmap().

static int vpu_map_hwregs	(	struct file *	fp,
		struct vm_area_struct *	vm
	)			[static]

memory map function of harware registers for vpu file operation

Returns:

0 on success or negative error code on error

Referenced by vpu_mmap().

static int vpu_mmap	(	struct file *	fp,
		struct vm_area_struct *	vm
	)			[static]

memory map interface for vpu file operation

Returns:

0 on success or negative error code on error

References vpu_map_dma_mem(), and vpu_map_hwregs().

static int vpu_open	(	struct inode *	inode,
		struct file *	filp
	)			[static]

open function for vpu file operation

Returns:

0 on success or negative error code on error

static int vpu_release	(	struct inode *	inode,
		struct file *	filp
	)			[static]

Release function for vpu file operation.

Returns:

0 on success or negative error code on error

References vpu_free_buffers(), and vpu_free_dma_buffer().

---

Variable Documentation

struct platform_driver mxcvpu_driver [static]

Initial value:

 {
        .driver = {
                   .name = "mxc_vpu",
                   },
        .probe = vpu_dev_probe,
        .remove = vpu_dev_remove,
        .suspend = vpu_suspend,
        .resume = vpu_resume,
}

Driver definition