ctvmem.h

Go to the documentation of this file.

#ifndef CTVMEM_H
#define CTVMEM_H

#define CT_PTP_NUM  4   /* num of device page table pages */

#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/pci.h>
#include <sound/memalloc.h>

/* The chip can handle the page table of 4k pages
 * (emu20k1 can handle even 8k pages, but we don't use it right now)
 */
#define CT_PAGE_SIZE    4096
#define CT_PAGE_SHIFT   12
#define CT_PAGE_MASK    (~(PAGE_SIZE - 1))
#define CT_PAGE_ALIGN(addr) ALIGN(addr, CT_PAGE_SIZE)

struct ct_vm_block {
    unsigned int addr;  /* starting logical addr of this block */
    unsigned int size;  /* size of this device virtual mem block */
    struct list_head list;
};

struct snd_pcm_substream;

/* Virtual memory management object for card device */
struct ct_vm {
    struct snd_dma_buffer ptp[CT_PTP_NUM];  /* Device page table pages */
    unsigned int size;      /* Available addr space in bytes */
    struct list_head unused;    /* List of unused blocks */
    struct list_head used;      /* List of used blocks */
    struct mutex lock;

    /* Map host addr (kmalloced/vmalloced) to device logical addr. */
    struct ct_vm_block *(*map)(struct ct_vm *, struct snd_pcm_substream *,
                   int size);
    /* Unmap device logical addr area. */
    void (*unmap)(struct ct_vm *, struct ct_vm_block *block);
    dma_addr_t (*get_ptp_phys)(struct ct_vm *vm, int index);
};

int ct_vm_create(struct ct_vm **rvm, struct pci_dev *pci);
void ct_vm_destroy(struct ct_vm *vm);

#endif /* CTVMEM_H */