[PATCH 1/2] drm/exynos: g2d: Add support for old S5Pv210 type

[Krzysztof Kozlowski]

The non-DRM s5p-g2d driver supports two versions of G2D: v3.0 on
S5Pv210 and v4.x on Exynos 4x12 (or newer). The driver for 3.0 device
version is doing two things differently:
1. Before starting the render process, it invalidates caches (pattern,
   source buffer and mask buffer). Cache control is not present on v4.x
   device.
2. Scalling is done through StretchEn command (in BITBLT_COMMAND_REG
   register) instead of SRC_SCALE_CTRL_REG as in v4.x. However the
   exynos_drm_g2d driver does not implement the scalling so this
   difference can be eliminated.

After adding support for v3.0 to exynos_drm_g2d driver, the old driver
can be removed.

Cc: Kyungmin Park <kyungmin.park at samsung.com>
Cc: Kamil Debski <k.debski at samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski at samsung.com>
---
 drivers/gpu/drm/exynos/exynos_drm_g2d.c | 37 +++++++++++++++++++++++++++++++--
 drivers/gpu/drm/exynos/exynos_drm_g2d.h |  7 +++++++
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
index 493552368295..44d8b28e9d98 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c
@@ -19,6 +19,7 @@
 #include <linux/dma-mapping.h>
 #include <linux/dma-attrs.h>
 #include <linux/of.h>
+#include <linux/of_device.h>
 
 #include <drm/drmP.h>
 #include <drm/exynos_drm.h>
@@ -38,6 +39,7 @@
 #define G2D_SOFT_RESET			0x0000
 #define G2D_INTEN			0x0004
 #define G2D_INTC_PEND			0x000C
+#define G2D_CACHECTL			0x0018 /* S5PV210 specific */
 #define G2D_DMA_SFR_BASE_ADDR		0x0080
 #define G2D_DMA_COMMAND			0x0084
 #define G2D_DMA_STATUS			0x008C
@@ -78,6 +80,11 @@
 #define G2D_INTP_GCMD_FIN		(1 << 1)
 #define G2D_INTP_SCMD_FIN		(1 << 0)
 
+/* G2D_CACHECTL, S5PV210 specific */
+#define G2D_CACHECTL_PATCACHE		(BIT(2))
+#define G2D_CACHECTL_SRCBUFFER		(BIT(1))
+#define G2D_CACHECTL_MASKBUFFER		(BIT(0))
+
 /* G2D_DMA_COMMAND */
 #define G2D_DMA_HALT			(1 << 2)
 #define G2D_DMA_CONTINUE		(1 << 1)
@@ -245,6 +252,7 @@ struct g2d_data {
 
 	unsigned long			current_pool;
 	unsigned long			max_pool;
+	enum exynos_drm_g2d_type	type;
 };
 
 static int g2d_init_cmdlist(struct g2d_data *g2d)
@@ -1125,6 +1133,13 @@ int exynos_g2d_set_cmdlist_ioctl(struct drm_device *drm_dev, void *data,
 	cmdlist->data[cmdlist->last++] = G2D_SRC_BASE_ADDR;
 	cmdlist->data[cmdlist->last++] = 0;
 
+	if (g2d->type == EXYNOS_DRM_G2D_TYPE_3X) {
+		cmdlist->data[cmdlist->last++] = G2D_CACHECTL;
+		cmdlist->data[cmdlist->last++] = G2D_CACHECTL_PATCACHE |
+						 G2D_CACHECTL_SRCBUFFER |
+						 G2D_CACHECTL_MASKBUFFER;
+	}
+
 	/*
 	 * 'LIST_HOLD' command should be set to the DMA_HOLD_CMD_REG
 	 * and GCF bit should be set to INTEN register if user wants
@@ -1369,10 +1384,20 @@ static int g2d_probe(struct platform_device *pdev)
 	struct exynos_drm_subdrv *subdrv;
 	int ret;
 
+	/* Sanity check, we can be instatiated only from DT */
+	if (!dev->of_node)
+		return -EINVAL;
+
 	g2d = devm_kzalloc(dev, sizeof(*g2d), GFP_KERNEL);
 	if (!g2d)
 		return -ENOMEM;
 
+	g2d->type = (enum exynos_drm_g2d_type)of_device_get_match_data(dev);
+	if (g2d->type == EXYNOS_DRM_G2D_TYPE_UNKNOWN) {
+		dev_err(dev, "failed to get type of device\n");
+		return -EINVAL;
+	}
+
 	g2d->runqueue_slab = kmem_cache_create("g2d_runqueue_slab",
 			sizeof(struct g2d_runqueue_node), 0, 0, NULL);
 	if (!g2d->runqueue_slab)
@@ -1535,8 +1560,16 @@ static const struct dev_pm_ops g2d_pm_ops = {
 };
 
 static const struct of_device_id exynos_g2d_match[] = {
-	{ .compatible = "samsung,exynos5250-g2d" },
-	{ .compatible = "samsung,exynos4212-g2d" },
+	{
+		.compatible = "samsung,exynos5250-g2d",
+		.data = (void *)EXYNOS_DRM_G2D_TYPE_4X,
+	}, {
+		.compatible = "samsung,exynos4212-g2d",
+		.data = (void *)EXYNOS_DRM_G2D_TYPE_4X,
+	}, {
+		.compatible = "samsung,s5pv210-g2d",
+		.data = (void *)EXYNOS_DRM_G2D_TYPE_3X,
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, exynos_g2d_match);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.h b/drivers/gpu/drm/exynos/exynos_drm_g2d.h
index 1a9c7ca8c15b..84ec8aff6f0a 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_g2d.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.h
@@ -7,6 +7,13 @@
  * published by the Free Software Foundationr
  */
 
+enum exynos_drm_g2d_type {
+	EXYNOS_DRM_G2D_TYPE_UNKNOWN,
+
+	EXYNOS_DRM_G2D_TYPE_3X,
+	EXYNOS_DRM_G2D_TYPE_4X,
+};
+
 #ifdef CONFIG_DRM_EXYNOS_G2D
 extern int exynos_g2d_get_ver_ioctl(struct drm_device *dev, void *data,
 				    struct drm_file *file_priv);
-- 
1.9.1