powerpc/5200: add LocalPlus bus FIFO device driver

This is a driver for the FIFO device on the LocalPlus bus on an mpc5200 system.
The driver supports programmed I/O through the FIFO as well as setting up DMA
via the BestComm engine through the FIFO.

Signed-off-by: John Bonesio <bones@secretlab.ca>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 39 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/mpc52xx.h b/arch/powerpc/include/asm/mpc52xx.h
index 671685011a23..707ab7590cfb 100644
--- a/arch/powerpc/include/asm/mpc52xx.h
+++ b/arch/powerpc/include/asm/mpc52xx.h
@@ -283,6 +283,45 @@ extern int mpc52xx_gpt_start_timer(struct mpc52xx_gpt_priv *gpt, int period,
                             int continuous);
 extern void mpc52xx_gpt_stop_timer(struct mpc52xx_gpt_priv *gpt);
 
+/* mpc52xx_lpbfifo.c */
+#define MPC52XX_LPBFIFO_FLAG_READ               (0)
+#define MPC52XX_LPBFIFO_FLAG_WRITE              (1<<0)
+#define MPC52XX_LPBFIFO_FLAG_NO_INCREMENT       (1<<1)
+#define MPC52XX_LPBFIFO_FLAG_NO_DMA             (1<<2)
+#define MPC52XX_LPBFIFO_FLAG_POLL_DMA           (1<<3)
+
+struct mpc52xx_lpbfifo_request {
+        struct list_head list;
+
+        /* localplus bus address */
+        unsigned int cs;
+        size_t offset;
+
+        /* Memory address */
+        void *data;
+        phys_addr_t data_phys;
+
+        /* Details of transfer */
+        size_t size;
+        size_t pos;     /* current position of transfer */
+        int flags;
+
+        /* What to do when finished */
+        void (*callback)(struct mpc52xx_lpbfifo_request *);
+
+        void *priv;             /* Driver private data */
+
+        /* statistics */
+        int irq_count;
+        int irq_ticks;
+        u8 last_byte;
+        int buffer_not_done_cnt;
+};
+
+extern int mpc52xx_lpbfifo_submit(struct mpc52xx_lpbfifo_request *req);
+extern void mpc52xx_lpbfifo_abort(struct mpc52xx_lpbfifo_request *req);
+extern void mpc52xx_lpbfifo_poll(void);
+
 /* mpc52xx_pic.c */
 extern void mpc52xx_init_irq(void);
 extern unsigned int mpc52xx_get_irq(void);