linux-kernel - [PATCH 10/10] ARM: S5PV210: add CMA support for FIMC devices on Aquila board

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Message-id: <1307699698-29369-11-git-send-email-m.szyprowski@samsung.com>
Date:	Fri, 10 Jun 2011 11:54:58 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org
Cc:	Michal Nazarewicz <mina86@...a86.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Ankita Garg <ankita@...ibm.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Johan MOSSBERG <johan.xx.mossberg@...ricsson.com>,
	Mel Gorman <mel@....ul.ie>, Arnd Bergmann <arnd@...db.de>,
	Jesse Barker <jesse.barker@...aro.org>
Subject: [PATCH 10/10] ARM: S5PV210: add CMA support for FIMC devices on Aquila
 board

This patch is an example how CMA can be activated for particular devices
in the system. It creates one CMA region and assigns it to all s5p-fimc
devices on Samsung Aquila S5PC110 board.

Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
 arch/arm/mach-s5pv210/Kconfig       |    1 +
 arch/arm/mach-s5pv210/mach-aquila.c |   26 ++++++++++++++++++++++++++
 2 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/arch/arm/mach-s5pv210/Kconfig b/arch/arm/mach-s5pv210/Kconfig
index 37b5a97..c09a92c 100644
--- a/arch/arm/mach-s5pv210/Kconfig
+++ b/arch/arm/mach-s5pv210/Kconfig
@@ -64,6 +64,7 @@ menu "S5PC110 Machines"
 config MACH_AQUILA
 	bool "Aquila"
 	select CPU_S5PV210
+	select CMA
 	select S3C_DEV_FB
 	select S5P_DEV_FIMC0
 	select S5P_DEV_FIMC1
diff --git a/arch/arm/mach-s5pv210/mach-aquila.c b/arch/arm/mach-s5pv210/mach-aquila.c
index 4e1d8ff..8c404e5 100644
--- a/arch/arm/mach-s5pv210/mach-aquila.c
+++ b/arch/arm/mach-s5pv210/mach-aquila.c
@@ -21,6 +21,8 @@
 #include <linux/gpio_keys.h>
 #include <linux/input.h>
 #include <linux/gpio.h>
+#include <linux/cma.h>
+#include <linux/dma-mapping.h>
 
 #include <asm/mach/arch.h>
 #include <asm/mach/map.h>
@@ -650,6 +652,19 @@ static void __init aquila_map_io(void)
 	s5p_set_timer_source(S5P_PWM3, S5P_PWM4);
 }
 
+unsigned long cma_area_start;
+unsigned long cma_area_size = 32 << 20;
+
+static void __init aquila_reserve(void)
+{
+	unsigned long ret = cma_reserve(cma_area_start, cma_area_size);
+	
+	if (!IS_ERR_VALUE(ret)) {
+		cma_area_start = ret;
+		printk(KERN_INFO "cma: reserved %ld bytes at %lx\n", cma_area_size, cma_area_start);
+	}
+}
+
 static void __init aquila_machine_init(void)
 {
 	/* PMIC */
@@ -672,6 +687,16 @@ static void __init aquila_machine_init(void)
 	s3c_fb_set_platdata(&aquila_lcd_pdata);
 
 	platform_add_devices(aquila_devices, ARRAY_SIZE(aquila_devices));
+
+	if (cma_area_start) {
+		struct cma *cma;
+		cma = cma_create(cma_area_start, cma_area_size);
+		if (cma) {
+			set_dev_cma_area(&s5p_device_fimc0.dev, cma);
+			set_dev_cma_area(&s5p_device_fimc1.dev, cma);
+			set_dev_cma_area(&s5p_device_fimc2.dev, cma);
+		}
+	}
 }
 
 MACHINE_START(AQUILA, "Aquila")
@@ -683,4 +708,5 @@ MACHINE_START(AQUILA, "Aquila")
 	.map_io		= aquila_map_io,
 	.init_machine	= aquila_machine_init,
 	.timer		= &s5p_timer,
+	.reserve	= aquila_reserve,
 MACHINE_END
-- 
1.7.1.569.g6f426

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