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[POWERPC] pasemi: Add function engine management functions to dma_lib

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Used to allocate functions for crypto/checksum offload.

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 12:25:59 -06:00
parent f37203b5cc
commit dda56df08a
2 changed files with 44 additions and 0 deletions
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40
arch/powerpc/platforms/pasemi/dma_lib.c
View File

@ -28,6 +28,7 @@
#define MAX_TXCH 64
#define MAX_RXCH 64
#define MAX_FLAGS 64
#define MAX_FUN 8
static struct pasdma_status *dma_status;
@ -46,6 +47,7 @@ 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);
static DECLARE_BITMAP(fun_free, MAX_FUN);
/* pasemi_read_iob_reg - read IOB register
* @reg: Register to read (offset into PCI CFG space)
@ -441,6 +443,41 @@ void pasemi_dma_clear_flag(int flag)
}
EXPORT_SYMBOL(pasemi_dma_clear_flag);
/* pasemi_dma_alloc_fun - Allocate a function engine
*
* Allocates a function engine to use for crypto/checksum offload
* Returns allocated engine (0-8), < 0 on error.
*/
int pasemi_dma_alloc_fun(void)
{
int bit;
retry:
bit = find_next_bit(fun_free, MAX_FLAGS, 0);
if (bit >= MAX_FLAGS)
return -ENOSPC;
if (!test_and_clear_bit(bit, fun_free))
goto retry;
return bit;
}
EXPORT_SYMBOL(pasemi_dma_alloc_fun);
/* pasemi_dma_free_fun - Deallocates a function engine
* @flag: Engine number to deallocate
*
* Frees up a function engine so it can be used for other purposes.
*/
void pasemi_dma_free_fun(int fun)
{
BUG_ON(test_bit(fun, fun_free));
BUG_ON(fun >= MAX_FLAGS);
set_bit(fun, fun_free);
}
EXPORT_SYMBOL(pasemi_dma_free_fun);
static void *map_onedev(struct pci_dev *p, int index)
{
struct device_node *dn;
@ -578,6 +615,9 @@ int pasemi_dma_init(void)
for (i = 0; i < MAX_FLAGS; i++)
__set_bit(i, flags_free);
for (i = 0; i < MAX_FUN; i++)
__set_bit(i, fun_free);
/* clear all status flags */
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 0xffffffff);
pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 0xffffffff);

4
include/asm-powerpc/pasemi_dma.h
View File

@ -472,6 +472,10 @@ extern void pasemi_dma_free_flag(int flag);
extern void pasemi_dma_set_flag(int flag);
extern void pasemi_dma_clear_flag(int flag);
/* Routines to allocate function engines */
extern int pasemi_dma_alloc_fun(void);
extern void pasemi_dma_free_fun(int fun);
/* Initialize the library, must be called before any other functions */
extern int pasemi_dma_init(void);