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Commit dda56df0 authored by Olof Johansson's avatar Olof Johansson
Browse files

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



Used to allocate functions for crypto/checksum offload.

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
Acked-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent f37203b5

arch/powerpc/platforms/pasemi/dma_lib.c

+40 −0
Original line number Diff line number Diff line
@@ -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);

include/asm-powerpc/pasemi_dma.h

+4 −0
Original line number Diff line number Diff line
@@ -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);