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authorOlof Johansson <olof@lixom.net>2008-03-05 12:25:59 -0600
committerOlof Johansson <olof@lixom.net>2008-03-05 12:26:50 -0600
commitdda56df08a28404004bca313d2a1ba1597acd755 (patch)
tree4bc1d1c4b052c0de0f5f4a5a5ae51232ea5c23a1 /arch/powerpc
parentf37203b5ccaf6d58cb5ca6b1840e40f3b587109c (diff)
[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>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/platforms/pasemi/dma_lib.c40
1 files changed, 40 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);