fsl-diu-fb: update Freescale DIU driver to use page_alloc_exact()

Update the Freescale DIU driver to use page_alloc_exact() to allocate a
DMA buffer.  This also eliminates the rheap-based memory allocator.  We
can do this now because commit 6ccf61f9 allows us to allocate 8MB
physically- contiguous memory blocks.

[akpm@linux-foundation.org: fix printk warnings]
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 22 insertions, 38 deletions

diff --git a/drivers/video/fsl-diu-fb.c b/drivers/video/fsl-diu-fb.c
index 09d7e22c6fef..9cd36c223d33 100644
--- a/drivers/video/fsl-diu-fb.c
+++ b/drivers/video/fsl-diu-fb.c
@@ -279,58 +279,42 @@ static struct diu_hw dr = {
 
 static struct diu_pool pool;
 
-/*      To allocate memory for framebuffer. First try __get_free_pages(). If it
- *      fails, try rh_alloc. The reason is __get_free_pages() cannot allocate
- *      very large memory (more than 4MB). We don't want to allocate all memory
- *      in rheap since small memory allocation/deallocation will fragment the
- *      rheap and make the furture large allocation fail.
+/**
+ * fsl_diu_alloc - allocate memory for the DIU
+ * @size: number of bytes to allocate
+ * @param: returned physical address of memory
+ *
+ * This function allocates a physically-contiguous block of memory.
  */
-
-static void *fsl_diu_alloc(unsigned long size, phys_addr_t *phys)
+static void *fsl_diu_alloc(size_t size, phys_addr_t *phys)
 {
         void *virt;
 
-        pr_debug("size=%lu\n", size);
+        pr_debug("size=%zu\n", size);
 
-        virt = (void *)__get_free_pages(GFP_DMA | __GFP_ZERO, get_order(size));
+        virt = alloc_pages_exact(size, GFP_DMA | __GFP_ZERO);
         if (virt) {
                 *phys = virt_to_phys(virt);
-                pr_debug("virt %p, phys=%llx\n", virt, (uint64_t) *phys);
-                return virt;
-        }
-        if (!diu_ops.diu_mem) {
-                printk(KERN_INFO "%s: no diu_mem."
-                        " To reserve more memory, put 'diufb=15M' "
-                        "in the command line\n", __func__);
-                return NULL;
-        }
-
-        virt = (void *)rh_alloc(&diu_ops.diu_rh_info, size, "DIU");
-        if (virt) {
-                *phys = virt_to_bus(virt);
-                memset(virt, 0, size);
+                pr_debug("virt=%p phys=%llx\n", virt,
+                        (unsigned long long)*phys);
         }
 
-        pr_debug("rh virt=%p phys=%llx\n", virt, (unsigned long long)*phys);
-
         return virt;
 }
 
-static void fsl_diu_free(void *p, unsigned long size)
+/**
+ * fsl_diu_free - release DIU memory
+ * @virt: pointer returned by fsl_diu_alloc()
+ * @size: number of bytes allocated by fsl_diu_alloc()
+ *
+ * This function releases memory allocated by fsl_diu_alloc().
+ */
+static void fsl_diu_free(void *virt, size_t size)
 {
-        pr_debug("p=%p size=%lu\n", p, size);
+        pr_debug("virt=%p size=%zu\n", virt, size);
 
-        if (!p)
-                return;
-
-        if ((p >= diu_ops.diu_mem) &&
-            (p < (diu_ops.diu_mem + diu_ops.diu_size))) {
-                pr_debug("rh\n");
-                rh_free(&diu_ops.diu_rh_info, (unsigned long) p);
-        } else {
-                pr_debug("dma\n");
-                free_pages((unsigned long)p, get_order(size));
-        }
+        if (virt && size)
+                free_pages_exact(virt, size);
 }
 
 static int fsl_diu_enable_panel(struct fb_info *info)