[POWERPC] pasemi: Add flag management functions to dma_lib

Add functions to manage the channel syncronization flags to dma_lib

Signed-off-by: Olof Johansson <olof@lixom.net>
Acked-by: Jeff Garzik <jgarzik@pobox.com>

2 files changed, 80 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pasemi/dma_lib.c b/arch/powerpc/platforms/pasemi/dma_lib.c
index 48cb7c99962d..07e4e25ef625 100644
--- a/arch/powerpc/platforms/pasemi/dma_lib.c
+++ b/arch/powerpc/platforms/pasemi/dma_lib.c
@@ -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);
 
diff --git a/include/asm-powerpc/pasemi_dma.h b/include/asm-powerpc/pasemi_dma.h
index 35577b6dec41..ffd413d7dfb0 100644
--- a/include/asm-powerpc/pasemi_dma.h
+++ b/include/asm-powerpc/pasemi_dma.h
@@ -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);