[PATCH] drm: exynos: add iommu support in hdmi driver with dt enabled

[Rahul Sharma]

This patch adds iommu support for hdmi driver with device tree based
search. It searches for sysmmu property in hdmi dt node to get tv
iommu device pointer which will be used to configure iommu hw interface.

This patch is based on "exynos-drm-next-iommu" branch at
http://git.kernel.org/?p=linux/kernel/git/daeinki/drm-exynos.git

This patch is having dependency on  linux-samsung-soc patchset posted at
http://permalink.gmane.org/gmane.linux.kernel.samsung-soc/13556

Signed-off-by: Rahul Sharma <rahul.sharma at samsung.com>
Signed-off-by: Prathyush K <prathyush.k at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_hdmi.c |   35 ++++++++++++++++++++++++++++++++++
 1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_hdmi.c b/drivers/gpu/drm/exynos/exynos_hdmi.c
index d1a1d71..a04452c 100644
--- a/drivers/gpu/drm/exynos/exynos_hdmi.c
+++ b/drivers/gpu/drm/exynos/exynos_hdmi.c
@@ -34,7 +34,9 @@
 #include <linux/regulator/consumer.h>
 #include <linux/io.h>
 #include <linux/of_gpio.h>
+#include <linux/of_platform.h>
 #include <plat/gpio-cfg.h>
+#include <mach/sysmmu.h>
 
 #include <drm/exynos_drm.h>
 
@@ -2275,6 +2277,34 @@ void hdmi_attach_hdmiphy_client(struct i2c_client *hdmiphy)
 }
 
 #ifdef CONFIG_OF
+
+static int drm_hdmi_dt_init_iommu(struct device *dev)
+{
+	struct platform_device *pds;
+	struct device_node *dn, *dns;
+	const __be32 *parp;
+
+	dn = dev->of_node;
+	parp = of_get_property(dn, "sysmmu", NULL);
+	if (parp == NULL) {
+		dev_err(dev, "failed to find sysmmu property\n");
+		return -EINVAL;
+	}
+	dns = of_find_node_by_phandle(be32_to_cpup(parp));
+	if (dns == NULL) {
+		dev_err(dev, "failed to find sysmmu node\n");
+		return -EINVAL;
+	}
+	pds = of_find_device_by_node(dns);
+	if (pds == NULL) {
+		dev_err(dev, "failed to find sysmmu platform device\n");
+		return -EINVAL;
+	}
+
+	platform_set_sysmmu(&pds->dev, dev);
+	return 0;
+}
+
 static struct s5p_hdmi_platform_data *drm_hdmi_dt_parse_pdata
 					(struct device *dev)
 {
@@ -2294,6 +2324,11 @@ static struct s5p_hdmi_platform_data *drm_hdmi_dt_parse_pdata
 		goto err_data;
 	}
 
+	if (drm_hdmi_dt_init_iommu(dev)) {
+		DRM_ERROR("no sysmmu property found\n");
+		goto err_data;
+	}
+
 	pd->hpd_gpio = of_get_named_gpio_flags(np, "hpd-gpio", 0, &flags);
 
 	return pd;
-- 
1.7.0.4