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[POWERPC] pasemi: Add flag management functions to dma_lib

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Add functions to manage the channel syncronization flags to dma_lib

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Jeff Garzik <jgarzik@pobox.com>
This commit is contained in:
Olof Johansson 2008-03-05 12:25:45 -06:00
parent afea3278f7
commit f37203b5cc
2 changed files with 80 additions and 0 deletions
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74
arch/powerpc/platforms/pasemi/dma_lib.c
View File

@ -27,6 +27,7 @@
#define MAX_TXCH 64
#define MAX_RXCH 64
#define MAX_FLAGS 64
static struct pasdma_status *dma_status;
@ -44,6 +45,7 @@ static struct pci_dev *dma_pdev;
static DECLARE_BITMAP(txch_free, MAX_TXCH);
static DECLARE_BITMAP(rxch_free, MAX_RXCH);
static DECLARE_BITMAP(flags_free, MAX_FLAGS);
/* pasemi_read_iob_reg - read IOB register
* @reg: Register to read (offset into PCI CFG space)
@ -374,6 +376,71 @@ void pasemi_dma_free_buf(struct pasemi_dmachan *chan, int size,
}
EXPORT_SYMBOL(pasemi_dma_free_buf);
/* pasemi_dma_alloc_flag - Allocate a flag (event) for channel syncronization
*
* Allocates a flag for use with channel syncronization (event descriptors).
* Returns allocated flag (0-63), < 0 on error.
*/
int pasemi_dma_alloc_flag(void)
{
int bit;
retry:
bit = find_next_bit(flags_free, MAX_FLAGS, 0);
if (bit >= MAX_FLAGS)
return -ENOSPC;
if (!test_and_clear_bit(bit, flags_free))
goto retry;
return bit;
}
EXPORT_SYMBOL(pasemi_dma_alloc_flag);
/* pasemi_dma_free_flag - Deallocates a flag (event)
* @flag: Flag number to deallocate
*
* Frees up a flag so it can be reused for other purposes.
*/
void pasemi_dma_free_flag(int flag)
{
BUG_ON(test_bit(flag, flags_free));
BUG_ON(flag >= MAX_FLAGS);
set_bit(flag, flags_free);
}
EXPORT_SYMBOL(pasemi_dma_free_flag);
/* pasemi_dma_set_flag - Sets a flag (event) to 1
* @flag: Flag number to set active
*
* Sets the flag provided to 1.
*/
void pasemi_dma_set_flag(int flag)
{
BUG_ON(flag >= MAX_FLAGS);
if (flag < 32)
pasemi_write_dma_reg(PAS_DMA_TXF_SFLG0, 1 << flag);
else
pasemi_write_dma_reg(PAS_DMA_TXF_SFLG1, 1 << flag);
}
EXPORT_SYMBOL(pasemi_dma_set_flag);
/* pasemi_dma_clear_flag - Sets a flag (event) to 0
* @flag: Flag number to set inactive
*
* Sets the flag provided to 0.
*/
void pasemi_dma_clear_flag(int flag)
{
BUG_ON(flag >= MAX_FLAGS);
if (flag < 32)
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 1 << flag);
else
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 1 << flag);
}
EXPORT_SYMBOL(pasemi_dma_clear_flag);
static void *map_onedev(struct pci_dev *p, int index)
{
struct device_node *dn;
@ -508,6 +575,13 @@ int pasemi_dma_init(void)
/* enable rx section */
pasemi_write_dma_reg(PAS_DMA_COM_RXCMD, PAS_DMA_COM_RXCMD_EN);
for (i = 0; i < MAX_FLAGS; i++)
__set_bit(i, flags_free);
/* clear all status flags */
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 0xffffffff);
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 0xffffffff);
printk(KERN_INFO "PA Semi PWRficient DMA library initialized "
"(%d tx, %d rx channels)\n", num_txch, num_rxch);

6
include/asm-powerpc/pasemi_dma.h
View File

@ -466,6 +466,12 @@ extern void *pasemi_dma_alloc_buf(struct pasemi_dmachan *chan, int size,
extern void pasemi_dma_free_buf(struct pasemi_dmachan *chan, int size,
dma_addr_t *handle);
/* Routines to allocate flags (events) for channel syncronization */
extern int pasemi_dma_alloc_flag(void);
extern void pasemi_dma_free_flag(int flag);
extern void pasemi_dma_set_flag(int flag);
extern void pasemi_dma_clear_flag(int flag);
/* Initialize the library, must be called before any other functions */
extern int pasemi_dma_init(void);