From dda56df08a28404004bca313d2a1ba1597acd755 Mon Sep 17 00:00:00 2001 From: Olof Johansson Date: Wed, 5 Mar 2008 12:25:59 -0600 Subject: [POWERPC] pasemi: Add function engine management functions to dma_lib Used to allocate functions for crypto/checksum offload. Signed-off-by: Olof Johansson Acked-by: Jeff Garzik --- arch/powerpc/platforms/pasemi/dma_lib.c | 40 +++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) (limited to 'arch/powerpc/platforms/pasemi') diff --git a/arch/powerpc/platforms/pasemi/dma_lib.c b/arch/powerpc/platforms/pasemi/dma_lib.c index 07e4e25ef62..217af321b0c 100644 --- a/arch/powerpc/platforms/pasemi/dma_lib.c +++ b/arch/powerpc/platforms/pasemi/dma_lib.c @@ -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); -- cgit v1.2.3