video: exynos_fimd: Add framework to disable FIMD sysmmu

On Exynos5420 and newer versions, the FIMD sysmmus are in
"on state" by default.
We have to disable them in order to make FIMD DMA work.
This patch adds the required framework to exynos_fimd driver,
and disables FIMD sysmmu on Exynos5420.

Signed-off-by: Ajay Kumar <ajaykumar.rs@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

arch/arm/dts/exynos54xx.dtsi

@@ -113,6 +113,16 @@
 		status = "disabled";
 	};
 
+	fimdm0_sysmmu@0x14640000 {
+		compatible = "samsung,sysmmu-v3.3";
+		reg = <0x14640000 0x100>;
+	};
+
+	fimdm1_sysmmu@0x14680000 {
+		compatible = "samsung,sysmmu-v3.3";
+		reg = <0x14680000 0x100>;
+	};
+
 	fimd@14400000 {
 		/* sysmmu is not used in U-Boot */
 		samsung,disable-sysmmu;

doc/device-tree-bindings/video/exynos-fb.txt

@@ -55,6 +55,12 @@ Board(panel specific):
 	samsung,pclk-name: parent clock identifier: 1(MPLL), 2(EPLL), 3(VPLL)
 	samsung,sclk-div: parent_clock/source_clock ratio
 	samsung,dual-lcd-enabled: 1 if you support two LCD, else 0
+	samsung,disable-sysmmu: Define this if you want to disable FIMD sysmmu.
+				(needed for Exynos5420 and newer versions)
+				Add the required FIMD sysmmu nodes to be
+				disabled with compatible string
+				"samsung,sysmmu-v3.3", with a "reg" property
+				holding the register address of FIMD sysmmu.
 
 Example:
 SOC specific part:

drivers/video/exynos_fimd.c

@@ -251,6 +251,45 @@ void exynos_fimd_window_off(unsigned int win_id)
 	writel(cfg, &fimd_ctrl->winshmap);
 }
 
+#ifdef CONFIG_OF_CONTROL
+/*
+* The reset value for FIMD SYSMMU register MMU_CTRL is 3
+* on Exynos5420 and newer versions.
+* This means FIMD SYSMMU is on by default on Exynos5420
+* and newer versions.
+* Since in u-boot we don't use SYSMMU, we should disable
+* those FIMD SYSMMU.
+* Note that there are 2 SYSMMU for FIMD: m0 and m1.
+* m0 handles windows 0 and 4, and m1 handles windows 1, 2 and 3.
+* We disable both of them here.
+*/
+void exynos_fimd_disable_sysmmu(void)
+{
+	u32 *sysmmufimd;
+	unsigned int node;
+	int node_list[2];
+	int count;
+	int i;
+
+	count = fdtdec_find_aliases_for_id(gd->fdt_blob, "fimd",
+				COMPAT_SAMSUNG_EXYNOS_SYSMMU, node_list, 2);
+	for (i = 0; i < count; i++) {
+		node = node_list[i];
+		if (node <= 0) {
+			debug("Can't get device node for fimd sysmmu\n");
+			return;
+		}
+
+		sysmmufimd = (u32 *)fdtdec_get_addr(gd->fdt_blob, node, "reg");
+		if (!sysmmufimd) {
+			debug("Can't get base address for sysmmu fimdm0");
+			return;
+		}
+
+		writel(0x0, sysmmufimd);
+	}
+}
+#endif
 
 void exynos_fimd_lcd_init(vidinfo_t *vid)
 {
@@ -268,6 +307,10 @@ void exynos_fimd_lcd_init(vidinfo_t *vid)
 								node, "reg");
 	if (fimd_ctrl == NULL)
 		debug("Can't get the FIMD base address\n");
+
+	if (fdtdec_get_bool(gd->fdt_blob, node, "samsung,disable-sysmmu"))
+		exynos_fimd_disable_sysmmu();
+
 #else
 	fimd_ctrl = (struct exynos_fb *)samsung_get_base_fimd();
 #endif

include/fdtdec.h

@@ -94,6 +94,7 @@ enum fdt_compat_id {
 	COMPAT_SANDBOX_LCD_SDL,		/* Sandbox LCD emulation with SDL */
 	COMPAT_TI_TPS65090,		/* Texas Instrument TPS65090 */
 	COMPAT_NXP_PTN3460,		/* NXP PTN3460 DP/LVDS bridge */
+	COMPAT_SAMSUNG_EXYNOS_SYSMMU,	/* Exynos sysmmu */
 
 	COMPAT_COUNT,
 };

lib/fdtdec.c

@@ -70,6 +70,7 @@ static const char * const compat_names[COMPAT_COUNT] = {
 	COMPAT(SANDBOX_LCD_SDL, "sandbox,lcd-sdl"),
 	COMPAT(TI_TPS65090, "ti,tps65090"),
 	COMPAT(COMPAT_NXP_PTN3460, "nxp,ptn3460"),
+	COMPAT(SAMSUNG_EXYNOS_SYSMMU, "samsung,sysmmu-v3.3"),
 };
 
 const char *fdtdec_get_compatible(enum fdt_compat_id id)