diff options
| -rw-r--r-- | arch/powerpc/platforms/pasemi/dma_lib.c | 40 | ||||
| -rw-r--r-- | include/asm-powerpc/pasemi_dma.h | 4 |
2 files changed, 44 insertions, 0 deletions
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); diff --git a/include/asm-powerpc/pasemi_dma.h b/include/asm-powerpc/pasemi_dma.h index ffd413d7dfb..facb2bdea45 100644 --- a/include/asm-powerpc/pasemi_dma.h +++ b/include/asm-powerpc/pasemi_dma.h @@ -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); |