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[POWERPC] pasemi: Add function engine management functions to dma_lib
Used to allocate functions for crypto/checksum offload. Signed-off-by: Olof Johansson <olof@lixom.net> Acked-by: Jeff Garzik <jgarzik@pobox.com>
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2 changed files with 44 additions and 0 deletions
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@ -28,6 +28,7 @@
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#define MAX_TXCH 64
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#define MAX_RXCH 64
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#define MAX_FLAGS 64
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#define MAX_FUN 8
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static struct pasdma_status *dma_status;
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@ -46,6 +47,7 @@ static struct pci_dev *dma_pdev;
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static DECLARE_BITMAP(txch_free, MAX_TXCH);
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static DECLARE_BITMAP(rxch_free, MAX_RXCH);
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static DECLARE_BITMAP(flags_free, MAX_FLAGS);
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static DECLARE_BITMAP(fun_free, MAX_FUN);
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/* pasemi_read_iob_reg - read IOB register
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* @reg: Register to read (offset into PCI CFG space)
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@ -441,6 +443,41 @@ void pasemi_dma_clear_flag(int flag)
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}
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EXPORT_SYMBOL(pasemi_dma_clear_flag);
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/* pasemi_dma_alloc_fun - Allocate a function engine
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*
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* Allocates a function engine to use for crypto/checksum offload
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* Returns allocated engine (0-8), < 0 on error.
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*/
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int pasemi_dma_alloc_fun(void)
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{
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int bit;
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retry:
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bit = find_next_bit(fun_free, MAX_FLAGS, 0);
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if (bit >= MAX_FLAGS)
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return -ENOSPC;
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if (!test_and_clear_bit(bit, fun_free))
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goto retry;
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return bit;
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}
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EXPORT_SYMBOL(pasemi_dma_alloc_fun);
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/* pasemi_dma_free_fun - Deallocates a function engine
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* @flag: Engine number to deallocate
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*
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* Frees up a function engine so it can be used for other purposes.
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*/
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void pasemi_dma_free_fun(int fun)
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{
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BUG_ON(test_bit(fun, fun_free));
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BUG_ON(fun >= MAX_FLAGS);
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set_bit(fun, fun_free);
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}
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EXPORT_SYMBOL(pasemi_dma_free_fun);
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static void *map_onedev(struct pci_dev *p, int index)
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{
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struct device_node *dn;
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@ -578,6 +615,9 @@ int pasemi_dma_init(void)
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for (i = 0; i < MAX_FLAGS; i++)
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__set_bit(i, flags_free);
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for (i = 0; i < MAX_FUN; i++)
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__set_bit(i, fun_free);
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/* clear all status flags */
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pasemi_write_dma_reg(PAS_DMA_TXF_CFLG0, 0xffffffff);
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pasemi_write_dma_reg(PAS_DMA_TXF_CFLG1, 0xffffffff);
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@ -472,6 +472,10 @@ extern void pasemi_dma_free_flag(int flag);
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extern void pasemi_dma_set_flag(int flag);
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extern void pasemi_dma_clear_flag(int flag);
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/* Routines to allocate function engines */
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extern int pasemi_dma_alloc_fun(void);
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extern void pasemi_dma_free_fun(int fun);
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/* Initialize the library, must be called before any other functions */
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extern int pasemi_dma_init(void);
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