i.MX31: Image Processing Unit DMA and IRQ drivers

i.MX3x SoCs contain an Image Processing Unit, consisting of a Control
Module (CM), Display Interface (DI), Synchronous Display Controller (SDC),
Asynchronous Display Controller (ADC), Image Converter (IC), Post-Filter
(PF), Camera Sensor Interface (CSI), and an Image DMA Controller (IDMAC).
CM contains, among other blocks, an Interrupt Generator (IG) and a Clock
and Reset Control Unit (CRCU). This driver serves IDMAC and IG. They are
supported over dmaengine and irq-chip APIs respectively.

IDMAC is a specialised DMA controller, its DMA channels cannot be used for
general-purpose operations, even though it might be possible to configure
a memory-to-memory channel for memcpy operation. This driver will not work
with generic dmaengine clients, clients, wishing to use it must use
respective wrapper structures, they also must specify which channels they
require, as channels are hard-wired to specific IPU functions.

Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <lg@denx.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index e34b06420816..48ea59e79672 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -62,6 +62,25 @@ config MV_XOR
         ---help---
           Enable support for the Marvell XOR engine.
 
+config MX3_IPU
+        bool "MX3x Image Processing Unit support"
+        depends on ARCH_MX3
+        select DMA_ENGINE
+        default y
+        help
+          If you plan to use the Image Processing unit in the i.MX3x, say
+          Y here. If unsure, select Y.
+
+config MX3_IPU_IRQS
+        int "Number of dynamically mapped interrupts for IPU"
+        depends on MX3_IPU
+        range 2 137
+        default 4
+        help
+          Out of 137 interrupt sources on i.MX31 IPU only very few are used.
+          To avoid bloating the irq_desc[] array we allocate a sufficient
+          number of IRQ slots and map them dynamically to specific sources.
+
 config DMA_ENGINE
         bool