mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 06:08:08 +00:00
20ea6adbf1
Build system: x86_64 Build-tested: bcm2708, bcm2709, bcm2710, bcm2711 Run-tested: bcm2708/RPiB+, bcm2709/RPi3B, bcm2710/RPi3B, bcm2711/RPi4B Signed-off-by: Marty Jones <mj8263788@gmail.com> Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
49 lines
2.1 KiB
Diff
49 lines
2.1 KiB
Diff
From 1520e1b2af8df4f9da28736adf2e29a0af7f9e00 Mon Sep 17 00:00:00 2001
|
|
From: Phil Elwell <phil@raspberrypi.org>
|
|
Date: Fri, 20 Jul 2018 22:03:41 +0100
|
|
Subject: [PATCH] bcm2835-dma: Add support for per-channel flags
|
|
|
|
Add the ability to interpret the high bits of the dreq specifier as
|
|
flags to be included in the DMA_CS register. The motivation for this
|
|
change is the ability to set the DISDEBUG flag for SD card transfers
|
|
to avoid corruption when using the VPU debugger.
|
|
|
|
Signed-off-by: Phil Elwell <phil@raspberrypi.org>
|
|
---
|
|
drivers/dma/bcm2835-dma.c | 10 ++++++++--
|
|
1 file changed, 8 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/dma/bcm2835-dma.c
|
|
+++ b/drivers/dma/bcm2835-dma.c
|
|
@@ -139,6 +139,10 @@ struct bcm2835_desc {
|
|
#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_CS_FLAGS(x) (x & (BCM2835_DMA_PRIORITY(15) | \
|
|
+ BCM2835_DMA_PANIC_PRIORITY(15) | \
|
|
+ BCM2835_DMA_WAIT_FOR_WRITES | \
|
|
+ BCM2835_DMA_DIS_DEBUG))
|
|
#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 */
|
|
@@ -452,7 +456,8 @@ static void bcm2835_dma_start_desc(struc
|
|
c->desc = d = to_bcm2835_dma_desc(&vd->tx);
|
|
|
|
writel(d->cb_list[0].paddr, c->chan_base + BCM2835_DMA_ADDR);
|
|
- writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS);
|
|
+ writel(BCM2835_DMA_ACTIVE | BCM2835_DMA_CS_FLAGS(c->dreq),
|
|
+ c->chan_base + BCM2835_DMA_CS);
|
|
}
|
|
|
|
static irqreturn_t bcm2835_dma_callback(int irq, void *data)
|
|
@@ -479,7 +484,8 @@ static irqreturn_t bcm2835_dma_callback(
|
|
* if this IRQ handler is threaded.) If the channel is finished, it
|
|
* will remain idle despite the ACTIVE flag being set.
|
|
*/
|
|
- writel(BCM2835_DMA_INT | BCM2835_DMA_ACTIVE,
|
|
+ writel(BCM2835_DMA_INT | BCM2835_DMA_ACTIVE |
|
|
+ BCM2835_DMA_CS_FLAGS(c->dreq),
|
|
c->chan_base + BCM2835_DMA_CS);
|
|
|
|
d = c->desc;
|