pasemi: DMA engine management library
pasemi: DMA engine management library
Introduce a DMA management library to manage the various DMA resources
on the PA Semi SoCs. Since several drivers need to allocate these shared
resources, provide some abstractions as well as allocation/free functions
for channels, etc.
Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
diff --git a/include/asm-powerpc/pasemi_dma.h b/include/asm-powerpc/pasemi_dma.h
index 8ef80d8..b4526ff 100644
--- a/include/asm-powerpc/pasemi_dma.h
+++ b/include/asm-powerpc/pasemi_dma.h
@@ -33,11 +33,27 @@
* device. Use the normal PCI config access functions for them.
*/
enum {
+ PAS_DMA_CAP_TXCH = 0x44, /* Transmit Channel Info */
+ PAS_DMA_CAP_RXCH = 0x48, /* Transmit Channel Info */
+ PAS_DMA_CAP_IFI = 0x4c, /* Interface Info */
PAS_DMA_COM_TXCMD = 0x100, /* Transmit Command Register */
PAS_DMA_COM_TXSTA = 0x104, /* Transmit Status Register */
PAS_DMA_COM_RXCMD = 0x108, /* Receive Command Register */
PAS_DMA_COM_RXSTA = 0x10c, /* Receive Status Register */
};
+
+
+#define PAS_DMA_CAP_TXCH_TCHN_M 0x00ff0000 /* # of TX channels */
+#define PAS_DMA_CAP_TXCH_TCHN_S 16
+
+#define PAS_DMA_CAP_RXCH_RCHN_M 0x00ff0000 /* # of RX channels */
+#define PAS_DMA_CAP_RXCH_RCHN_S 16
+
+#define PAS_DMA_CAP_IFI_IOFF_M 0xff000000 /* Cfg reg for intf pointers */
+#define PAS_DMA_CAP_IFI_IOFF_S 24
+#define PAS_DMA_CAP_IFI_NIN_M 0x00ff0000 /* # of interfaces */
+#define PAS_DMA_CAP_IFI_NIN_S 16
+
#define PAS_DMA_COM_TXCMD_EN 0x00000001 /* enable */
#define PAS_DMA_COM_TXSTA_ACT 0x00000001 /* active */
#define PAS_DMA_COM_RXCMD_EN 0x00000001 /* enable */
@@ -388,4 +404,64 @@
CTRL_CMD_REG_M)
+
+/* Prototypes for the shared DMA functions in the platform code. */
+
+/* DMA TX Channel type. Right now only limitations used are event types 0/1,
+ * for event-triggered DMA transactions.
+ */
+
+enum pasemi_dmachan_type {
+ RXCHAN = 0, /* Any RX chan */
+ TXCHAN = 1, /* Any TX chan */
+ TXCHAN_EVT0 = 0x1001, /* TX chan in event class 0 (chan 0-9) */
+ TXCHAN_EVT1 = 0x2001, /* TX chan in event class 1 (chan 10-19) */
+};
+
+struct pasemi_dmachan {
+ int chno; /* Channel number */
+ enum pasemi_dmachan_type chan_type; /* TX / RX */
+ u64 *status; /* Ptr to cacheable status */
+ int irq; /* IRQ used by channel */
+ unsigned int ring_size; /* size of allocated ring */
+ dma_addr_t ring_dma; /* DMA address for ring */
+ u64 *ring_virt; /* Virt address for ring */
+ void *priv; /* Ptr to start of client struct */
+};
+
+/* Read/write the different registers in the I/O Bridge, Ethernet
+ * and DMA Controller
+ */
+extern unsigned int pasemi_read_iob_reg(unsigned int reg);
+extern void pasemi_write_iob_reg(unsigned int reg, unsigned int val);
+
+extern unsigned int pasemi_read_mac_reg(int intf, unsigned int reg);
+extern void pasemi_write_mac_reg(int intf, unsigned int reg, unsigned int val);
+
+extern unsigned int pasemi_read_dma_reg(unsigned int reg);
+extern void pasemi_write_dma_reg(unsigned int reg, unsigned int val);
+
+/* Channel management routines */
+
+extern void *pasemi_dma_alloc_chan(enum pasemi_dmachan_type type,
+ int total_size, int offset);
+extern void pasemi_dma_free_chan(struct pasemi_dmachan *chan);
+
+extern void pasemi_dma_start_chan(const struct pasemi_dmachan *chan,
+ const u32 cmdsta);
+extern int pasemi_dma_stop_chan(const struct pasemi_dmachan *chan);
+
+/* Common routines to allocate rings and buffers */
+
+extern int pasemi_dma_alloc_ring(struct pasemi_dmachan *chan, int ring_size);
+extern void pasemi_dma_free_ring(struct pasemi_dmachan *chan);
+
+extern void *pasemi_dma_alloc_buf(struct pasemi_dmachan *chan, int size,
+ dma_addr_t *handle);
+extern void pasemi_dma_free_buf(struct pasemi_dmachan *chan, int size,
+ dma_addr_t *handle);
+
+/* Initialize the library, must be called before any other functions */
+extern int pasemi_dma_init(void);
+
#endif /* ASM_PASEMI_DMA_H */