3.16.66-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
commit e42685d7a7d5afa6278561ffd85c475eae246be3 upstream.
Add additional defines describing the DMA registers
as well as adding some more documentation to those registers.
Signed-off-by: Martin Sperl <kernel@xxxxxxxxxxxxxxxx>
Reviewed-by: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Eric Anholt <eric@xxxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
[bwh: Backported to 3.16 as dependency of commit 9e528c799d17
"dmaengine: bcm2835: Fix abort of transactions"]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/dma/bcm2835-dma.c | 57 +++++++++++++++++++++++++++++++++------
1 file changed, 49 insertions(+), 8 deletions(-)
--- a/drivers/dma/bcm2835-dma.c
+++ b/drivers/dma/bcm2835-dma.c
@@ -91,26 +91,67 @@ struct bcm2835_desc {
#define BCM2835_DMA_CS 0x00
#define BCM2835_DMA_ADDR 0x04
+#define BCM2835_DMA_TI 0x08
#define BCM2835_DMA_SOURCE_AD 0x0c
#define BCM2835_DMA_DEST_AD 0x10
-#define BCM2835_DMA_NEXTCB 0x1C
+#define BCM2835_DMA_LEN 0x14
+#define BCM2835_DMA_STRIDE 0x18
+#define BCM2835_DMA_NEXTCB 0x1c
+#define BCM2835_DMA_DEBUG 0x20
/* DMA CS Control and Status bits */
-#define BCM2835_DMA_ACTIVE BIT(0)
-#define BCM2835_DMA_INT BIT(2)
+#define BCM2835_DMA_ACTIVE BIT(0) /* activate the DMA */
+#define BCM2835_DMA_END BIT(1) /* current CB has ended */
+#define BCM2835_DMA_INT BIT(2) /* interrupt status */
+#define BCM2835_DMA_DREQ BIT(3) /* DREQ state */
#define BCM2835_DMA_ISPAUSED BIT(4) /* Pause requested or not active */
#define BCM2835_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */
-#define BCM2835_DMA_ERR BIT(8)
+#define BCM2835_DMA_WAITING_FOR_WRITES BIT(6) /* waiting for last
+ * AXI-write to ack
+ */
+#define BCM2835_DMA_ERR BIT(8)
+#define BCM2835_DMA_PRIORITY(x) ((x & 15) << 16) /* AXI priority */
+#define BCM2835_DMA_PANIC_PRIORITY(x) ((x & 15) << 20) /* panic priority */
+/* current value of TI.BCM2835_DMA_WAIT_RESP */
+#define BCM2835_DMA_WAIT_FOR_WRITES BIT(28)
+#define BCM2835_DMA_DIS_DEBUG BIT(29) /* disable debug pause signal */
#define BCM2835_DMA_ABORT BIT(30) /* Stop current CB, go to next, WO */
#define BCM2835_DMA_RESET BIT(31) /* WO, self clearing */
+/* Transfer information bits - also bcm2835_cb.info field */
#define BCM2835_DMA_INT_EN BIT(0)
+#define BCM2835_DMA_TDMODE BIT(1) /* 2D-Mode */
+#define BCM2835_DMA_WAIT_RESP BIT(3) /* wait for AXI-write to be acked */
#define BCM2835_DMA_D_INC BIT(4)
-#define BCM2835_DMA_D_DREQ BIT(6)
+#define BCM2835_DMA_D_WIDTH BIT(5) /* 128bit writes if set */
+#define BCM2835_DMA_D_DREQ BIT(6) /* enable DREQ for destination */
+#define BCM2835_DMA_D_IGNORE BIT(7) /* ignore destination writes */
#define BCM2835_DMA_S_INC BIT(8)
-#define BCM2835_DMA_S_DREQ BIT(10)
+#define BCM2835_DMA_S_WIDTH BIT(9) /* 128bit writes if set */
+#define BCM2835_DMA_S_DREQ BIT(10) /* enable SREQ for source */
+#define BCM2835_DMA_S_IGNORE BIT(11) /* ignore source reads - read 0 */
+#define BCM2835_DMA_BURST_LENGTH(x) ((x & 15) << 12)
+#define BCM2835_DMA_PER_MAP(x) ((x & 31) << 16) /* REQ source */
+#define BCM2835_DMA_WAIT(x) ((x & 31) << 21) /* add DMA-wait cycles */
+#define BCM2835_DMA_NO_WIDE_BURSTS BIT(26) /* no 2 beat write bursts */
-#define BCM2835_DMA_PER_MAP(x) ((x) << 16)
+/* debug register bits */
+#define BCM2835_DMA_DEBUG_LAST_NOT_SET_ERR BIT(0)
+#define BCM2835_DMA_DEBUG_FIFO_ERR BIT(1)
+#define BCM2835_DMA_DEBUG_READ_ERR BIT(2)
+#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_SHIFT 4
+#define BCM2835_DMA_DEBUG_OUTSTANDING_WRITES_BITS 4
+#define BCM2835_DMA_DEBUG_ID_SHIFT 16
+#define BCM2835_DMA_DEBUG_ID_BITS 9
+#define BCM2835_DMA_DEBUG_STATE_SHIFT 16
+#define BCM2835_DMA_DEBUG_STATE_BITS 9
+#define BCM2835_DMA_DEBUG_VERSION_SHIFT 25
+#define BCM2835_DMA_DEBUG_VERSION_BITS 3
+#define BCM2835_DMA_DEBUG_LITE BIT(28)
+
+/* shared registers for all dma channels */
+#define BCM2835_DMA_INT_STATUS 0xfe0
+#define BCM2835_DMA_ENABLE 0xff0
#define BCM2835_DMA_DATA_TYPE_S8 1
#define BCM2835_DMA_DATA_TYPE_S16 2
