V4L/DVB (11350): Add camera (CSI) driver for MX1

Add support for CMOS Sensor Interface on i.MX1 and i.MXL SoCs.

 create mode 100644 arch/arm/mach-mx1/ksym_mx1.c
 create mode 100644 arch/arm/mach-mx1/mx1_camera_fiq.S
 create mode 100644 arch/arm/plat-mxc/include/mach/mx1_camera.h
 create mode 100644 drivers/media/video/mx1_camera.c

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
Signed-off-by: Darius Augulis <augulis.darius@gmail.com>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

arch/arm/mach-mx1/Makefile

@@ -6,6 +6,9 @@
 
 obj-y			+= generic.o clock.o devices.o
 
+# Support for CMOS sensor interface
+obj-$(CONFIG_MX1_VIDEO)	+= ksym_mx1.o mx1_camera_fiq.o
+
 # Specific board support
 obj-$(CONFIG_ARCH_MX1ADS) += mx1ads.o
 obj-$(CONFIG_MACH_SCB9328) += scb9328.o

arch/arm/mach-mx1/devices.c

@@ -44,7 +44,7 @@ static struct resource imx_csi_resources[] = {
 static u64 imx_csi_dmamask = 0xffffffffUL;
 
 struct platform_device imx_csi_device = {
-	.name           = "imx-csi",
+	.name           = "mx1-camera",
 	.id             = 0, /* This is used to put cameras on this interface */
 	.dev		= {
 		.dma_mask = &imx_csi_dmamask,

arch/arm/mach-mx1/ksym_mx1.c

@@ -0,0 +1,18 @@
+/*
+ * Exported ksyms of ARCH_MX1
+ *
+ * Copyright (C) 2008, Darius Augulis <augulis.darius@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+
+#include <mach/mx1_camera.h>
+
+/* IMX camera FIQ handler */
+EXPORT_SYMBOL(mx1_camera_sof_fiq_start);
+EXPORT_SYMBOL(mx1_camera_sof_fiq_end);

arch/arm/mach-mx1/mx1_camera_fiq.S

@@ -0,0 +1,35 @@
+/*
+ *  Copyright (C) 2008 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ *  Based on linux/arch/arm/lib/floppydma.S
+ *      Copyright (C) 1995, 1996 Russell King
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/linkage.h>
+#include <asm/assembler.h>
+
+		.text
+		.global	mx1_camera_sof_fiq_end
+		.global	mx1_camera_sof_fiq_start
+mx1_camera_sof_fiq_start:
+		@ enable dma
+		ldr	r12, [r9]
+		orr	r12, r12, #0x00000001
+		str	r12, [r9]
+		@ unmask DMA interrupt
+		ldr	r12, [r8]
+		bic	r12, r12, r13
+		str	r12, [r8]
+		@ disable SOF interrupt
+		ldr	r12, [r10]
+		bic	r12, r12, #0x00010000
+		str	r12, [r10]
+		@ clear SOF flag
+		mov	r12, #0x00010000
+		str	r12, [r11]
+		@ return from FIQ
+		subs	pc, lr, #4
+mx1_camera_sof_fiq_end:

arch/arm/plat-mxc/include/mach/memory.h

@@ -24,4 +24,12 @@
 #define PHYS_OFFSET		UL(0x80000000)
 #endif
 
+#if defined(CONFIG_MX1_VIDEO)
+/*
+ * Increase size of DMA-consistent memory region.
+ * This is required for i.MX camera driver to capture at least four VGA frames.
+ */
+#define CONSISTENT_DMA_SIZE SZ_4M
+#endif /* CONFIG_MX1_VIDEO */
+
 #endif /* __ASM_ARCH_MXC_MEMORY_H__ */

arch/arm/plat-mxc/include/mach/mx1_camera.h

@@ -0,0 +1,35 @@
+/*
+ * mx1_camera.h - i.MX1/i.MXL camera driver header file
+ *
+ * Copyright (c) 2008, Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ * Copyright (C) 2009, Darius Augulis <augulis.darius@gmail.com>
+ *
+ * Based on PXA camera.h file:
+ * Copyright (C) 2003, Intel Corporation
+ * Copyright (C) 2008, Guennadi Liakhovetski <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __ASM_ARCH_CAMERA_H_
+#define __ASM_ARCH_CAMERA_H_
+
+#define MX1_CAMERA_DATA_HIGH	1
+#define MX1_CAMERA_PCLK_RISING	2
+#define MX1_CAMERA_VSYNC_HIGH	4
+
+extern unsigned char mx1_camera_sof_fiq_start, mx1_camera_sof_fiq_end;
+
+/**
+ * struct mx1_camera_pdata - i.MX1/i.MXL camera platform data
+ * @mclk_10khz:	master clock frequency in 10kHz units
+ * @flags:	MX1 camera platform flags
+ */
+struct mx1_camera_pdata {
+	unsigned long mclk_10khz;
+	unsigned long flags;
+};
+
+#endif /* __ASM_ARCH_CAMERA_H_ */

drivers/media/video/Kconfig

@@ -746,6 +746,18 @@ config SOC_CAMERA_OV772X
 	help
 	  This is a ov772x camera driver
 
+config MX1_VIDEO
+	bool
+
+config VIDEO_MX1
+	tristate "i.MX1/i.MXL CMOS Sensor Interface driver"
+	depends on VIDEO_DEV && ARCH_MX1 && SOC_CAMERA
+	select FIQ
+	select VIDEOBUF_DMA_CONTIG
+	select MX1_VIDEO
+	---help---
+	  This is a v4l2 driver for the i.MX1/i.MXL CMOS Sensor Interface
+
 config VIDEO_MX3
 	tristate "i.MX3x Camera Sensor Interface driver"
 	depends on VIDEO_DEV && MX3_IPU && SOC_CAMERA
@@ -904,5 +916,4 @@ config USB_S2255
 	  This driver can be compiled as a module, called s2255drv.
 
 endif # V4L_USB_DRIVERS
-
 endif # VIDEO_CAPTURE_DRIVERS

drivers/media/video/Makefile

@@ -133,6 +133,7 @@ obj-$(CONFIG_VIDEO_CX18) += cx18/
 obj-$(CONFIG_VIDEO_VIVI) += vivi.o
 obj-$(CONFIG_VIDEO_CX23885) += cx23885/
 
+obj-$(CONFIG_VIDEO_MX1)			+= mx1_camera.o
 obj-$(CONFIG_VIDEO_MX3)			+= mx3_camera.o
 obj-$(CONFIG_VIDEO_PXA27x)		+= pxa_camera.o
 obj-$(CONFIG_VIDEO_SH_MOBILE_CEU)	+= sh_mobile_ceu_camera.o