Base Au1200 2.6 support.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

5 files changed, 244 insertions, 105 deletions

diff --git a/arch/mips/au1000/common/au1xxx_irqmap.c b/arch/mips/au1000/common/au1xxx_irqmap.c
index 8a0f39f67c59..0b2c03c52319 100644
--- a/arch/mips/au1000/common/au1xxx_irqmap.c
+++ b/arch/mips/au1000/common/au1xxx_irqmap.c
@@ -173,14 +173,14 @@ au1xxx_irq_map_t au1xxx_ic0_map[] = {
 	{ AU1550_PSC1_INT, INTC_INT_HIGH_LEVEL, 0},
 	{ AU1550_PSC2_INT, INTC_INT_HIGH_LEVEL, 0},
 	{ AU1550_PSC3_INT, INTC_INT_HIGH_LEVEL, 0},
-	{ AU1550_TOY_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_TOY_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_TOY_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_TOY_MATCH2_INT, INTC_INT_RISE_EDGE, 1 },
-	{ AU1550_RTC_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_RTC_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_RTC_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1550_RTC_MATCH2_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH2_INT, INTC_INT_RISE_EDGE, 1 },
+	{ AU1000_RTC_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH2_INT, INTC_INT_RISE_EDGE, 0 },
 	{ AU1550_NAND_INT, INTC_INT_RISE_EDGE, 0},
 	{ AU1550_USB_DEV_REQ_INT, INTC_INT_HIGH_LEVEL, 0 },
 	{ AU1550_USB_DEV_SUS_INT, INTC_INT_RISE_EDGE, 0 },
@@ -201,14 +201,14 @@ au1xxx_irq_map_t au1xxx_ic0_map[] = {
 	{ AU1200_PSC1_INT, INTC_INT_HIGH_LEVEL, 0},
 	{ AU1200_AES_INT, INTC_INT_HIGH_LEVEL, 0},
 	{ AU1200_CAMERA_INT, INTC_INT_HIGH_LEVEL, 0},
-	{ AU1200_TOY_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_TOY_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_TOY_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_TOY_MATCH2_INT, INTC_INT_RISE_EDGE, 1 },
-	{ AU1200_RTC_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_RTC_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_RTC_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
-	{ AU1200_RTC_MATCH2_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_TOY_MATCH2_INT, INTC_INT_RISE_EDGE, 1 },
+	{ AU1000_RTC_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH0_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH1_INT, INTC_INT_RISE_EDGE, 0 },
+	{ AU1000_RTC_MATCH2_INT, INTC_INT_RISE_EDGE, 0 },
 	{ AU1200_NAND_INT, INTC_INT_RISE_EDGE, 0},
 	{ AU1200_USB_INT, INTC_INT_HIGH_LEVEL, 0 },
 	{ AU1200_LCD_INT, INTC_INT_HIGH_LEVEL, 0},
diff --git a/arch/mips/au1000/common/cputable.c b/arch/mips/au1000/common/cputable.c
index f5521dfccfd6..4dbde82c8215 100644
--- a/arch/mips/au1000/common/cputable.c
+++ b/arch/mips/au1000/common/cputable.c
@@ -37,7 +37,8 @@ struct cpu_spec	cpu_specs[] = {
     { 0xffffffff, 0x02030203, "Au1100 BD", 0, 1 },
     { 0xffffffff, 0x02030204, "Au1100 BE", 0, 1 },
     { 0xffffffff, 0x03030200, "Au1550 AA", 0, 1 },
-    { 0xffffffff, 0x04030200, "Au1200 AA", 0, 1 },
+    { 0xffffffff, 0x04030200, "Au1200 AB", 0, 0 },
+    { 0xffffffff, 0x04030201, "Au1200 AC", 0, 1 },
     { 0x00000000, 0x00000000, "Unknown Au1xxx", 1, 0 },
 };
 
diff --git a/arch/mips/au1000/common/dbdma.c b/arch/mips/au1000/common/dbdma.c
index adfc3172aace..cf10dc246f82 100644
--- a/arch/mips/au1000/common/dbdma.c
+++ b/arch/mips/au1000/common/dbdma.c
@@ -29,6 +29,7 @@
  *  675 Mass Ave, Cambridge, MA 02139, USA.
  *
  */
+
 #include <linux/config.h>
 #include <linux/kernel.h>
 #include <linux/errno.h>
@@ -42,6 +43,8 @@
 #include <asm/mach-au1x00/au1xxx_dbdma.h>
 #include <asm/system.h>
 
+/* #include <linux/module.h> */
+
 #if defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200)
 
 /*
@@ -55,43 +58,16 @@
  * functions.  The drivers allocate the data buffers and assign them
  * to the descriptors.
  */
-static DEFINE_SPINLOCK(au1xxx_dbdma_spin_lock);
+static spinlock_t au1xxx_dbdma_spin_lock = SPIN_LOCK_UNLOCKED;
 
 /* I couldn't find a macro that did this......
 */
 #define ALIGN_ADDR(x, a)	((((u32)(x)) + (a-1)) & ~(a-1))
 
-static volatile dbdma_global_t *dbdma_gptr = (dbdma_global_t *)DDMA_GLOBAL_BASE;
-static int dbdma_initialized;
+static dbdma_global_t *dbdma_gptr = (dbdma_global_t *)DDMA_GLOBAL_BASE;
+static int dbdma_initialized=0;
 static void au1xxx_dbdma_init(void);
 
-typedef struct dbdma_device_table {
-	u32		dev_id;
-	u32		dev_flags;
-	u32		dev_tsize;
-	u32		dev_devwidth;
-	u32		dev_physaddr;		/* If FIFO */
-	u32		dev_intlevel;
-	u32		dev_intpolarity;
-} dbdev_tab_t;
-
-typedef struct dbdma_chan_config {
-	u32			chan_flags;
-	u32			chan_index;
-	dbdev_tab_t		*chan_src;
-	dbdev_tab_t		*chan_dest;
-	au1x_dma_chan_t		*chan_ptr;
-	au1x_ddma_desc_t	*chan_desc_base;
-	au1x_ddma_desc_t	*get_ptr, *put_ptr, *cur_ptr;
-	void			*chan_callparam;
-	void (*chan_callback)(int, void *, struct pt_regs *);
-} chan_tab_t;
-
-#define	DEV_FLAGS_INUSE		(1 << 0)
-#define	DEV_FLAGS_ANYUSE	(1 << 1)
-#define DEV_FLAGS_OUT		(1 << 2)
-#define DEV_FLAGS_IN		(1 << 3)
-
 static dbdev_tab_t dbdev_tab[] = {
 #ifdef CONFIG_SOC_AU1550
 	/* UARTS */
@@ -157,13 +133,13 @@ static dbdev_tab_t dbdev_tab[] = {
 	{ DSCR_CMD0_MAE_BOTH, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
 	{ DSCR_CMD0_LCD, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
 
-	{ DSCR_CMD0_SDMS_TX0, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_SDMS_RX0, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_SDMS_TX1, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_SDMS_RX1, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
+	{ DSCR_CMD0_SDMS_TX0, DEV_FLAGS_OUT, 4, 8, 0x10600000, 0, 0 },
+	{ DSCR_CMD0_SDMS_RX0, DEV_FLAGS_IN, 4, 8, 0x10600004, 0, 0 },
+	{ DSCR_CMD0_SDMS_TX1, DEV_FLAGS_OUT, 4, 8, 0x10680000, 0, 0 },
+	{ DSCR_CMD0_SDMS_RX1, DEV_FLAGS_IN, 4, 8, 0x10680004, 0, 0 },
 
-	{ DSCR_CMD0_AES_TX, DEV_FLAGS_OUT, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_AES_RX, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
+	{ DSCR_CMD0_AES_RX, DEV_FLAGS_IN , 4, 32, 0x10300008, 0, 0 },
+	{ DSCR_CMD0_AES_TX, DEV_FLAGS_OUT, 4, 32, 0x10300004, 0, 0 },
 
 	{ DSCR_CMD0_PSC0_TX, DEV_FLAGS_OUT, 0, 0, 0x11a0001c, 0, 0 },
 	{ DSCR_CMD0_PSC0_RX, DEV_FLAGS_IN, 0, 0, 0x11a0001c, 0, 0 },
@@ -173,9 +149,9 @@ static dbdev_tab_t dbdev_tab[] = {
 	{ DSCR_CMD0_PSC1_RX, DEV_FLAGS_IN, 0, 0, 0x11b0001c, 0, 0 },
 	{ DSCR_CMD0_PSC1_SYNC, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
 
-	{ DSCR_CMD0_CIM_RXA, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_CIM_RXB, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
-	{ DSCR_CMD0_CIM_RXC, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
+	{ DSCR_CMD0_CIM_RXA, DEV_FLAGS_IN, 0, 32, 0x14004020, 0, 0 },
+	{ DSCR_CMD0_CIM_RXB, DEV_FLAGS_IN, 0, 32, 0x14004040, 0, 0 },
+	{ DSCR_CMD0_CIM_RXC, DEV_FLAGS_IN, 0, 32, 0x14004060, 0, 0 },
 	{ DSCR_CMD0_CIM_SYNC, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
 
 	{ DSCR_CMD0_NAND_FLASH, DEV_FLAGS_IN, 0, 0, 0x00000000, 0, 0 },
@@ -184,6 +160,24 @@ static dbdev_tab_t dbdev_tab[] = {
 
 	{ DSCR_CMD0_THROTTLE, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
 	{ DSCR_CMD0_ALWAYS, DEV_FLAGS_ANYUSE, 0, 0, 0x00000000, 0, 0 },
+
+	/* Provide 16 user definable device types */
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
+	{ 0, 0, 0, 0, 0, 0, 0 },
 };
 
 #define DBDEV_TAB_SIZE (sizeof(dbdev_tab) / sizeof(dbdev_tab_t))
@@ -203,6 +197,30 @@ find_dbdev_id (u32 id)
 	return NULL;
 }
 
+u32
+au1xxx_ddma_add_device(dbdev_tab_t *dev)
+{
+	u32 ret = 0;
+	dbdev_tab_t *p=NULL;
+	static u16 new_id=0x1000;
+
+	p = find_dbdev_id(0);
+	if ( NULL != p )
+	{
+		memcpy(p, dev, sizeof(dbdev_tab_t));
+ 		p->dev_id = DSCR_DEV2CUSTOM_ID(new_id,dev->dev_id);
+		ret = p->dev_id;
+		new_id++;
+#if 0
+		printk("add_device: id:%x flags:%x padd:%x\n",
+				p->dev_id, p->dev_flags, p->dev_physaddr );
+#endif
+	}
+
+	return ret;
+}
+EXPORT_SYMBOL(au1xxx_ddma_add_device);
+
 /* Allocate a channel and return a non-zero descriptor if successful.
 */
 u32
@@ -215,7 +233,7 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 	int		i;
 	dbdev_tab_t	*stp, *dtp;
 	chan_tab_t	*ctp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
 
 	/* We do the intialization on the first channel allocation.
 	 * We have to wait because of the interrupt handler initialization
@@ -225,9 +243,6 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 		au1xxx_dbdma_init();
 	dbdma_initialized = 1;
 
-	if ((srcid > DSCR_NDEV_IDS) || (destid > DSCR_NDEV_IDS))
-		return 0;
-
 	if ((stp = find_dbdev_id(srcid)) == NULL) return 0;
 	if ((dtp = find_dbdev_id(destid)) == NULL) return 0;
 
@@ -269,9 +284,9 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 				/* If kmalloc fails, it is caught below same
 				 * as a channel not available.
 				 */
-				ctp = kmalloc(sizeof(chan_tab_t), GFP_KERNEL);
+				ctp = (chan_tab_t *)
+					kmalloc(sizeof(chan_tab_t), GFP_KERNEL);
 				chan_tab_ptr[i] = ctp;
-				ctp->chan_index = chan = i;
 				break;
 			}
 		}
@@ -279,10 +294,11 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 
 		if (ctp != NULL) {
 			memset(ctp, 0, sizeof(chan_tab_t));
+			ctp->chan_index = chan = i;
 			dcp = DDMA_CHANNEL_BASE;
 			dcp += (0x0100 * chan);
 			ctp->chan_ptr = (au1x_dma_chan_t *)dcp;
-			cp = (volatile au1x_dma_chan_t *)dcp;
+			cp = (au1x_dma_chan_t *)dcp;
 			ctp->chan_src = stp;
 			ctp->chan_dest = dtp;
 			ctp->chan_callback = callback;
@@ -299,6 +315,9 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 				i |= DDMA_CFG_DED;
 			if (dtp->dev_intpolarity)
 				i |= DDMA_CFG_DP;
+			if ((stp->dev_flags & DEV_FLAGS_SYNC) ||
+				(dtp->dev_flags & DEV_FLAGS_SYNC))
+					i |= DDMA_CFG_SYNC;
 			cp->ddma_cfg = i;
 			au_sync();
 
@@ -309,14 +328,14 @@ au1xxx_dbdma_chan_alloc(u32 srcid, u32 destid,
 			rv = (u32)(&chan_tab_ptr[chan]);
 		}
 		else {
-			/* Release devices.
-			*/
+			/* Release devices */
 			stp->dev_flags &= ~DEV_FLAGS_INUSE;
 			dtp->dev_flags &= ~DEV_FLAGS_INUSE;
 		}
 	}
 	return rv;
 }
+EXPORT_SYMBOL(au1xxx_dbdma_chan_alloc);
 
 /* Set the device width if source or destination is a FIFO.
  * Should be 8, 16, or 32 bits.
@@ -344,6 +363,7 @@ au1xxx_dbdma_set_devwidth(u32 chanid, int bits)
 
 	return rv;
 }
+EXPORT_SYMBOL(au1xxx_dbdma_set_devwidth);
 
 /* Allocate a descriptor ring, initializing as much as possible.
 */
@@ -370,7 +390,8 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 	 * and if we try that first we are likely to not waste larger
 	 * slabs of memory.
 	 */
-	desc_base = (u32)kmalloc(entries * sizeof(au1x_ddma_desc_t), GFP_KERNEL);
+	desc_base = (u32)kmalloc(entries * sizeof(au1x_ddma_desc_t),
+			GFP_KERNEL|GFP_DMA);
 	if (desc_base == 0)
 		return 0;
 
@@ -381,7 +402,7 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 		kfree((const void *)desc_base);
 		i = entries * sizeof(au1x_ddma_desc_t);
 		i += (sizeof(au1x_ddma_desc_t) - 1);
-		if ((desc_base = (u32)kmalloc(i, GFP_KERNEL)) == 0)
+		if ((desc_base = (u32)kmalloc(i, GFP_KERNEL|GFP_DMA)) == 0)
 			return 0;
 
 		desc_base = ALIGN_ADDR(desc_base, sizeof(au1x_ddma_desc_t));
@@ -461,9 +482,14 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 	/* If source input is fifo, set static address.
 	*/
 	if (stp->dev_flags & DEV_FLAGS_IN) {
-		src0 = stp->dev_physaddr;
+		if ( stp->dev_flags & DEV_FLAGS_BURSTABLE )
+			src1 |= DSCR_SRC1_SAM(DSCR_xAM_BURST);
+		else
 		src1 |= DSCR_SRC1_SAM(DSCR_xAM_STATIC);
+
 	}
+	if (stp->dev_physaddr)
+		src0 = stp->dev_physaddr;
 
 	/* Set up dest1.  For now, assume no stride and increment.
 	 * A channel attribute update can change this later.
@@ -487,10 +513,18 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 	/* If destination output is fifo, set static address.
 	*/
 	if (dtp->dev_flags & DEV_FLAGS_OUT) {
-		dest0 = dtp->dev_physaddr;
+		if ( dtp->dev_flags & DEV_FLAGS_BURSTABLE )
+	                dest1 |= DSCR_DEST1_DAM(DSCR_xAM_BURST);
+				else
 		dest1 |= DSCR_DEST1_DAM(DSCR_xAM_STATIC);
 	}
+	if (dtp->dev_physaddr)
+		dest0 = dtp->dev_physaddr;
 
+#if 0
+		printk("did:%x sid:%x cmd0:%x cmd1:%x source0:%x source1:%x dest0:%x dest1:%x\n",
+			dtp->dev_id, stp->dev_id, cmd0, cmd1, src0, src1, dest0, dest1 );
+#endif
 	for (i=0; i<entries; i++) {
 		dp->dscr_cmd0 = cmd0;
 		dp->dscr_cmd1 = cmd1;
@@ -499,6 +533,7 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 		dp->dscr_dest0 = dest0;
 		dp->dscr_dest1 = dest1;
 		dp->dscr_stat = 0;
+				dp->sw_context = dp->sw_status = 0;
 		dp->dscr_nxtptr = DSCR_NXTPTR(virt_to_phys(dp + 1));
 		dp++;
 	}
@@ -511,13 +546,14 @@ au1xxx_dbdma_ring_alloc(u32 chanid, int entries)
 
 	return (u32)(ctp->chan_desc_base);
 }
+EXPORT_SYMBOL(au1xxx_dbdma_ring_alloc);
 
 /* Put a source buffer into the DMA ring.
  * This updates the source pointer and byte count.  Normally used
  * for memory to fifo transfers.
  */
 u32
-au1xxx_dbdma_put_source(u32 chanid, void *buf, int nbytes)
+_au1xxx_dbdma_put_source(u32 chanid, void *buf, int nbytes, u32 flags)
 {
 	chan_tab_t		*ctp;
 	au1x_ddma_desc_t	*dp;
@@ -544,24 +580,40 @@ au1xxx_dbdma_put_source(u32 chanid, void *buf, int nbytes)
 	*/
 	dp->dscr_source0 = virt_to_phys(buf);
 	dp->dscr_cmd1 = nbytes;
-	dp->dscr_cmd0 |= DSCR_CMD0_V;	/* Let it rip */
-	ctp->chan_ptr->ddma_dbell = 0xffffffff;	/* Make it go */
-
+	/* Check flags  */
+	if (flags & DDMA_FLAGS_IE)
+		dp->dscr_cmd0 |= DSCR_CMD0_IE;
+	if (flags & DDMA_FLAGS_NOIE)
+		dp->dscr_cmd0 &= ~DSCR_CMD0_IE;
 	/* Get next descriptor pointer.
 	*/
 	ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
 
+	/*
+	 * There is an errata on the Au1200/Au1550 parts that could result
+	 * in "stale" data being DMA'd. It has to do with the snoop logic on
+	 * the dache eviction buffer.  NONCOHERENT_IO is on by default for
+	 * these parts. If it is fixedin the future, these dma_cache_inv will
+	 * just be nothing more than empty macros. See io.h.
+	 * */
+	dma_cache_wback_inv(buf,nbytes);
+        dp->dscr_cmd0 |= DSCR_CMD0_V;        /* Let it rip */
+	au_sync();
+	dma_cache_wback_inv(dp, sizeof(dp));
+        ctp->chan_ptr->ddma_dbell = 0;
+
 	/* return something not zero.
 	*/
 	return nbytes;
 }
+EXPORT_SYMBOL(_au1xxx_dbdma_put_source);
 
 /* Put a destination buffer into the DMA ring.
  * This updates the destination pointer and byte count.  Normally used
  * to place an empty buffer into the ring for fifo to memory transfers.
  */
 u32
-au1xxx_dbdma_put_dest(u32 chanid, void *buf, int nbytes)
+_au1xxx_dbdma_put_dest(u32 chanid, void *buf, int nbytes, u32 flags)
 {
 	chan_tab_t		*ctp;
 	au1x_ddma_desc_t	*dp;
@@ -583,11 +635,33 @@ au1xxx_dbdma_put_dest(u32 chanid, void *buf, int nbytes)
 	if (dp->dscr_cmd0 & DSCR_CMD0_V)
 		return 0;
 
-	/* Load up buffer address and byte count.
-	*/
+	/* Load up buffer address and byte count */
+
+	/* Check flags  */
+	if (flags & DDMA_FLAGS_IE)
+		dp->dscr_cmd0 |= DSCR_CMD0_IE;
+	if (flags & DDMA_FLAGS_NOIE)
+		dp->dscr_cmd0 &= ~DSCR_CMD0_IE;
+
 	dp->dscr_dest0 = virt_to_phys(buf);
 	dp->dscr_cmd1 = nbytes;
+#if 0
+	printk("cmd0:%x cmd1:%x source0:%x source1:%x dest0:%x dest1:%x\n",
+			dp->dscr_cmd0, dp->dscr_cmd1, dp->dscr_source0,
+			dp->dscr_source1, dp->dscr_dest0, dp->dscr_dest1 );
+#endif
+	/*
+	 * There is an errata on the Au1200/Au1550 parts that could result in
+	 * "stale" data being DMA'd. It has to do with the snoop logic on the
+	 * dache eviction buffer. NONCOHERENT_IO is on by default for these
+	 * parts. If it is fixedin the future, these dma_cache_inv will just
+	 * be nothing more than empty macros. See io.h.
+	 * */
+	dma_cache_inv(buf,nbytes);
 	dp->dscr_cmd0 |= DSCR_CMD0_V;	/* Let it rip */
+	au_sync();
+	dma_cache_wback_inv(dp, sizeof(dp));
+        ctp->chan_ptr->ddma_dbell = 0;
 
 	/* Get next descriptor pointer.
 	*/
@@ -597,6 +671,7 @@ au1xxx_dbdma_put_dest(u32 chanid, void *buf, int nbytes)
 	*/
 	return nbytes;
 }
+EXPORT_SYMBOL(_au1xxx_dbdma_put_dest);
 
 /* Get a destination buffer into the DMA ring.
  * Normally used to get a full buffer from the ring during fifo
@@ -646,7 +721,7 @@ void
 au1xxx_dbdma_stop(u32 chanid)
 {
 	chan_tab_t	*ctp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
 	int halt_timeout = 0;
 
 	ctp = *((chan_tab_t **)chanid);
@@ -666,6 +741,7 @@ au1xxx_dbdma_stop(u32 chanid)
 	cp->ddma_stat |= (DDMA_STAT_DB | DDMA_STAT_V);
 	au_sync();
 }
+EXPORT_SYMBOL(au1xxx_dbdma_stop);
 
 /* Start using the current descriptor pointer.  If the dbdma encounters
  * a not valid descriptor, it will stop.  In this case, we can just
@@ -675,17 +751,17 @@ void
 au1xxx_dbdma_start(u32 chanid)
 {
 	chan_tab_t	*ctp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
 
 	ctp = *((chan_tab_t **)chanid);
-
 	cp = ctp->chan_ptr;
 	cp->ddma_desptr = virt_to_phys(ctp->cur_ptr);
 	cp->ddma_cfg |= DDMA_CFG_EN;	/* Enable channel */
 	au_sync();
-	cp->ddma_dbell = 0xffffffff;	/* Make it go */
+	cp->ddma_dbell = 0;
 	au_sync();
 }
+EXPORT_SYMBOL(au1xxx_dbdma_start);
 
 void
 au1xxx_dbdma_reset(u32 chanid)
@@ -704,15 +780,21 @@ au1xxx_dbdma_reset(u32 chanid)
 
 	do {
 		dp->dscr_cmd0 &= ~DSCR_CMD0_V;
+		/* reset our SW status -- this is used to determine
+		 * if a descriptor is in use by upper level SW. Since
+		 * posting can reset 'V' bit.
+		 */
+		dp->sw_status = 0;
 		dp = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
 	} while (dp != ctp->chan_desc_base);
 }
+EXPORT_SYMBOL(au1xxx_dbdma_reset);
 
 u32
 au1xxx_get_dma_residue(u32 chanid)
 {
 	chan_tab_t	*ctp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
 	u32		rv;
 
 	ctp = *((chan_tab_t **)chanid);
@@ -747,15 +829,16 @@ au1xxx_dbdma_chan_free(u32 chanid)
 
 	kfree(ctp);
 }
+EXPORT_SYMBOL(au1xxx_dbdma_chan_free);
 
-static irqreturn_t
+static void
 dbdma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 {
-	u32	intstat;
+	u32        				intstat, flags;
 	u32	chan_index;
 	chan_tab_t		*ctp;
 	au1x_ddma_desc_t	*dp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
 
 	intstat = dbdma_gptr->ddma_intstat;
 	au_sync();
@@ -774,19 +857,26 @@ dbdma_interrupt(int irq, void *dev_id, struct pt_regs *regs)
 		(ctp->chan_callback)(irq, ctp->chan_callparam, regs);
 
 	ctp->cur_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
-
-	return IRQ_HANDLED;
 }
 
-static void
-au1xxx_dbdma_init(void)
+static void au1xxx_dbdma_init(void)
 {
+	int irq_nr;
+
 	dbdma_gptr->ddma_config = 0;
 	dbdma_gptr->ddma_throttle = 0;
 	dbdma_gptr->ddma_inten = 0xffff;
 	au_sync();
 
-	if (request_irq(AU1550_DDMA_INT, dbdma_interrupt, SA_INTERRUPT,
+#if defined(CONFIG_SOC_AU1550)
+	irq_nr = AU1550_DDMA_INT;
+#elif defined(CONFIG_SOC_AU1200)
+	irq_nr = AU1200_DDMA_INT;
+#else
+	#error Unknown Au1x00 SOC
+#endif
+
+	if (request_irq(irq_nr, dbdma_interrupt, SA_INTERRUPT,
 			"Au1xxx dbdma", (void *)dbdma_gptr))
 		printk("Can't get 1550 dbdma irq");
 }
@@ -797,7 +887,8 @@ au1xxx_dbdma_dump(u32 chanid)
 	chan_tab_t		*ctp;
 	au1x_ddma_desc_t	*dp;
 	dbdev_tab_t		*stp, *dtp;
-	volatile au1x_dma_chan_t *cp;
+	au1x_dma_chan_t *cp;
+		u32			i = 0;
 
 	ctp = *((chan_tab_t **)chanid);
 	stp = ctp->chan_src;
@@ -822,15 +913,64 @@ au1xxx_dbdma_dump(u32 chanid)
 	dp = ctp->chan_desc_base;
 
 	do {
-		printk("dp %08x, cmd0 %08x, cmd1 %08x\n",
-			(u32)dp, dp->dscr_cmd0, dp->dscr_cmd1);
-		printk("src0 %08x, src1 %08x, dest0 %08x\n",
-			dp->dscr_source0, dp->dscr_source1, dp->dscr_dest0);
-		printk("dest1 %08x, stat %08x, nxtptr %08x\n",
-			dp->dscr_dest1, dp->dscr_stat, dp->dscr_nxtptr);
+                printk("Dp[%d]= %08x, cmd0 %08x, cmd1 %08x\n",
+                        i++, (u32)dp, dp->dscr_cmd0, dp->dscr_cmd1);
+                printk("src0 %08x, src1 %08x, dest0 %08x, dest1 %08x\n",
+                        dp->dscr_source0, dp->dscr_source1, dp->dscr_dest0, dp->dscr_dest1);
+                printk("stat %08x, nxtptr %08x\n",
+                        dp->dscr_stat, dp->dscr_nxtptr);
 		dp = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
 	} while (dp != ctp->chan_desc_base);
 }
 
+/* Put a descriptor into the DMA ring.
+ * This updates the source/destination pointers and byte count.
+ */
+u32
+au1xxx_dbdma_put_dscr(u32 chanid, au1x_ddma_desc_t *dscr )
+{
+	chan_tab_t *ctp;
+	au1x_ddma_desc_t *dp;
+	u32 nbytes=0;
+
+	/* I guess we could check this to be within the
+	* range of the table......
+	*/
+	ctp = *((chan_tab_t **)chanid);
+
+	/* We should have multiple callers for a particular channel,
+	* an interrupt doesn't affect this pointer nor the descriptor,
+	* so no locking should be needed.
+	*/
+	dp = ctp->put_ptr;
+
+	/* If the descriptor is valid, we are way ahead of the DMA
+	* engine, so just return an error condition.
+	*/
+	if (dp->dscr_cmd0 & DSCR_CMD0_V)
+		return 0;
+
+	/* Load up buffer addresses and byte count.
+	*/
+	dp->dscr_dest0 = dscr->dscr_dest0;
+	dp->dscr_source0 = dscr->dscr_source0;
+	dp->dscr_dest1 = dscr->dscr_dest1;
+	dp->dscr_source1 = dscr->dscr_source1;
+	dp->dscr_cmd1 = dscr->dscr_cmd1;
+	nbytes = dscr->dscr_cmd1;
+	/* Allow the caller to specifiy if an interrupt is generated */
+	dp->dscr_cmd0 &= ~DSCR_CMD0_IE;
+	dp->dscr_cmd0 |= dscr->dscr_cmd0 | DSCR_CMD0_V;
+	ctp->chan_ptr->ddma_dbell = 0;
+
+	/* Get next descriptor pointer.
+	*/
+	ctp->put_ptr = phys_to_virt(DSCR_GET_NXTPTR(dp->dscr_nxtptr));
+
+	/* return something not zero.
+	*/
+	return nbytes;
+}
+
 #endif /* defined(CONFIG_SOC_AU1550) || defined(CONFIG_SOC_AU1200) */
 
diff --git a/arch/mips/au1000/common/irq.c b/arch/mips/au1000/common/irq.c
index 0b912f739feb..ebf93bdbad14 100644
--- a/arch/mips/au1000/common/irq.c
+++ b/arch/mips/au1000/common/irq.c
@@ -488,7 +488,7 @@ void intc0_req0_irqdispatch(struct pt_regs *regs)
 	intc0_req0 |= au_readl(IC0_REQ0INT);
 
 	if (!intc0_req0) return;
-
+#ifdef AU1000_USB_DEV_REQ_INT
 	/*
 	 * Because of the tight timing of SETUP token to reply
 	 * transactions, the USB devices-side packet complete
@@ -499,7 +499,7 @@ void intc0_req0_irqdispatch(struct pt_regs *regs)
 		do_IRQ(AU1000_USB_DEV_REQ_INT, regs);
 		return;
 	}
-
+#endif
 	irq = au_ffs(intc0_req0) - 1;
 	intc0_req0 &= ~(1<<irq);
 	do_IRQ(irq, regs);
diff --git a/arch/mips/au1000/common/usbdev.c b/arch/mips/au1000/common/usbdev.c
index 447a9a4612a8..0b21bed7ee55 100644
--- a/arch/mips/au1000/common/usbdev.c
+++ b/arch/mips/au1000/common/usbdev.c
@@ -1005,11 +1005,11 @@ process_ep0_receive (struct usb_dev* dev)
 #endif
 		dev->ep0_stage = SETUP_STAGE;
 		break;
-		}
+	}
 
 	spin_unlock(&ep0->lock);
-		// we're done processing the packet, free it
-		kfree(pkt);
+	// we're done processing the packet, free it
+	kfree(pkt);
 }
 
 
@@ -1072,8 +1072,7 @@ dma_done_ep0_intr(int irq, void *dev_id, struct pt_regs *regs)
 			clear_dma_done1(ep0->indma);
 
 		pkt = send_packet_complete(ep0);
-		if (pkt)
-			kfree(pkt);
+		kfree(pkt);
 	}
 
 	/*
@@ -1302,8 +1301,7 @@ usbdev_exit(void)
 		endpoint_flush(ep);
 	}
 
-	if (usbdev.full_conf_desc)
-		kfree(usbdev.full_conf_desc);
+	kfree(usbdev.full_conf_desc);
 }
 
 int