/*------------------------------------------------------------------------*
* usb_pc_alloc_mem - allocate DMA'able memory
*
* Returns:
* 0: Success
* Else: Failure
*------------------------------------------------------------------------*/
uint8_t
usb_pc_alloc_mem(struct usb_page_cache *pc, struct usb_page *pg,
usb_size_t size, usb_size_t align)
{
void *ptr;
uint32_t rem;
/* allocate zeroed memory */
if (align != 1) {
ptr = usb_malloc(size + align);
if (ptr == NULL)
goto error;
rem = (-((uintptr_t)ptr)) & (align - 1);
} else {
ptr = usb_malloc(size);
if (ptr == NULL)
goto error;
rem = 0;
}
/* setup page cache */
pc->buffer = ((uint8_t *)ptr) + rem;
pc->page_start = pg;
pc->page_offset_buf = 0;
pc->page_offset_end = size;
pc->map = NULL;
pc->tag = ptr;
pc->ismultiseg = (align == 1);
/* compute physical address */
usb_pc_common_mem_cb(pc, ptr, size);
usb_pc_cpu_flush(pc);
return (0);
error:
/* reset most of the page cache */
pc->buffer = NULL;
pc->page_start = NULL;
pc->page_offset_buf = 0;
pc->page_offset_end = 0;
pc->map = NULL;
pc->tag = NULL;
return (1);
}
/*------------------------------------------------------------------------*
* usb_pc_load_mem - load virtual memory into DMA
*
* Return values:
* 0: Success
* Else: Error
*------------------------------------------------------------------------*/
uint8_t
usb_pc_load_mem(struct usb_page_cache *pc, usb_size_t size, uint8_t sync)
{
/* setup page cache */
pc->page_offset_buf = 0;
pc->page_offset_end = size;
pc->ismultiseg = 1;
mtx_assert(pc->tag_parent->mtx, MA_OWNED);
if (size > 0) {
/* compute physical address */
usb_pc_common_mem_cb(pc, pc->buffer, size);
}
if (sync == 0) {
/*
* Call callback so that refcount is decremented
* properly:
*/
pc->tag_parent->dma_error = 0;
(pc->tag_parent->func) (pc->tag_parent);
}
return (0);
}
/*------------------------------------------------------------------------*
* usb_pc_load_mem_cb - BUS-DMA callback function
*------------------------------------------------------------------------*/
static void
usb_pc_load_mem_cb(void *arg, bus_dma_segment_t *segs,
int nseg, int error)
{
usb_pc_common_mem_cb(arg, segs, nseg, error, 1);
}
