sh_mobile_meram: Add direct MERAM allocation API

The API can be used to allocate and free MERAM blocks directly, without
going through ICBs.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

2 files changed, 53 insertions, 4 deletions

diff --git a/drivers/video/sh_mobile_meram.c b/drivers/video/sh_mobile_meram.c
index fdb6fc1decb..7a0ba8bb3fb 100644
--- a/drivers/video/sh_mobile_meram.c
+++ b/drivers/video/sh_mobile_meram.c
@@ -195,6 +195,21 @@ static inline unsigned long meram_read_reg(void __iomem *base, unsigned int off)
 }
 
 /* -----------------------------------------------------------------------------
+ * MERAM allocation and free
+ */
+
+static unsigned long meram_alloc(struct sh_mobile_meram_priv *priv, size_t size)
+{
+        return gen_pool_alloc(priv->pool, size);
+}
+
+static void meram_free(struct sh_mobile_meram_priv *priv, unsigned long mem,
+                       size_t size)
+{
+        gen_pool_free(priv->pool, mem, size);
+}
+
+/* -----------------------------------------------------------------------------
  * LCDC cache planes allocation, init, cleanup and free
  */
 
@@ -216,7 +231,7 @@ static int meram_plane_alloc(struct sh_mobile_meram_priv *priv,
                 return -ENOMEM;
         plane->marker = &priv->icbs[idx];
 
-        mem = gen_pool_alloc(priv->pool, size * 1024);
+        mem = meram_alloc(priv, size * 1024);
         if (mem == 0)
                 return -ENOMEM;
 
@@ -233,8 +248,8 @@ static int meram_plane_alloc(struct sh_mobile_meram_priv *priv,
 static void meram_plane_free(struct sh_mobile_meram_priv *priv,
                              struct sh_mobile_meram_fb_plane *plane)
 {
-        gen_pool_free(priv->pool, priv->meram + plane->marker->offset,
-                      plane->marker->size * 1024);
+        meram_free(priv, priv->meram + plane->marker->offset,
+                   plane->marker->size * 1024);
 
         __clear_bit(plane->marker->index, &priv->used_icb);
         __clear_bit(plane->cache->index, &priv->used_icb);
@@ -386,9 +401,27 @@ static void meram_plane_cleanup(struct sh_mobile_meram_priv *priv,
 }
 
 /* -----------------------------------------------------------------------------
- * LCDC cache operations
+ * MERAM operations
  */
 
+unsigned long sh_mobile_meram_alloc(struct sh_mobile_meram_info *pdata,
+                                    size_t size)
+{
+        struct sh_mobile_meram_priv *priv = pdata->priv;
+
+        return meram_alloc(priv, size);
+}
+EXPORT_SYMBOL_GPL(sh_mobile_meram_alloc);
+
+void sh_mobile_meram_free(struct sh_mobile_meram_info *pdata, unsigned long mem,
+                          size_t size)
+{
+        struct sh_mobile_meram_priv *priv = pdata->priv;
+
+        meram_free(priv, mem, size);
+}
+EXPORT_SYMBOL_GPL(sh_mobile_meram_free);
+
 /* Allocate memory for the ICBs and mark them as used. */
 static struct sh_mobile_meram_fb_cache *
 meram_cache_alloc(struct sh_mobile_meram_priv *priv,
diff --git a/include/video/sh_mobile_meram.h b/include/video/sh_mobile_meram.h
index 11348379f09..062e6e7f955 100644
--- a/include/video/sh_mobile_meram.h
+++ b/include/video/sh_mobile_meram.h
@@ -38,6 +38,10 @@ struct sh_mobile_meram_cfg {
 
 #if defined(CONFIG_FB_SH_MOBILE_MERAM) || \
     defined(CONFIG_FB_SH_MOBILE_MERAM_MODULE)
+unsigned long sh_mobile_meram_alloc(struct sh_mobile_meram_info *meram_dev,
+                                    size_t size);
+void sh_mobile_meram_free(struct sh_mobile_meram_info *meram_dev,
+                          unsigned long mem, size_t size);
 void *sh_mobile_meram_cache_alloc(struct sh_mobile_meram_info *dev,
                                   const struct sh_mobile_meram_cfg *cfg,
                                   unsigned int xres, unsigned int yres,
@@ -50,6 +54,18 @@ void sh_mobile_meram_cache_update(struct sh_mobile_meram_info *dev, void *data,
                                   unsigned long *icb_addr_y,
                                   unsigned long *icb_addr_c);
 #else
+static inline unsigned long
+sh_mobile_meram_alloc(struct sh_mobile_meram_info *meram_dev, size_t size)
+{
+        return 0;
+}
+
+static inline void
+sh_mobile_meram_free(struct sh_mobile_meram_info *meram_dev,
+                     unsigned long mem, size_t size)
+{
+}
+
 static inline void *
 sh_mobile_meram_cache_alloc(struct sh_mobile_meram_info *dev,
                             const struct sh_mobile_meram_cfg *cfg,