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Commit f37203b5 authored by Olof Johansson's avatar Olof Johansson
Browse files

[POWERPC] pasemi: Add flag management functions to dma_lib 



Add functions to manage the channel syncronization flags to dma_lib

Signed-off-by: default avatarOlof Johansson <olof@lixom.net>
Acked-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent afea3278

arch/powerpc/platforms/pasemi/dma_lib.c

+74 −0
Original line number Diff line number Diff line
@@ -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);

include/asm-powerpc/pasemi_dma.h

+6 −0
Original line number Diff line number Diff line
@@ -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);