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authorTomi Valkeinen <tomi.valkeinen@ti.com>2012-11-09 15:52:20 +0200
committerTomi Valkeinen <tomi.valkeinen@ti.com>2012-11-13 09:52:24 +0200
commit0049fb2603b7afb1080776ee691dfa5a3d282357 (patch)
tree87a13be03223d34213fc9f213e0a480b365a4dd0
parent3f5ba55e8f3698432c65b0ef77e83d22d5f64a79 (diff)
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OMAPFB: use dma_alloc_attrs to allocate memory
Use dma_alloc_attrs to allocate memory instead of omap specific vram allocator. After this we can remove the omap vram allocator. There are some downsides to this change: 1) dma_alloc_attrs doesn't let us allocate at certain physical address. However, this should not be a problem as this feature of vram allocator is only used when reserving the framebuffer that was initialized by the bootloader, and we don't currently support "passing" a framebuffer from the bootloader to the kernel anyway. 2) dma_alloc_attrs, as of now, always ioremaps the allocated area, and we don't need the ioremap when using VRFB. This patch uses DMA_ATTR_NO_KERNEL_MAPPING for the allocation, but the flag is currently not operational. 3) OMAPFB_GET_VRAM_INFO ioctl cannot return real values anymore. I changed the ioctl to return 64M for all the values, which, I hope, the applications will interpret as "there's enough vram". 4) "vram" kernel parameter to define how much ram to reserve for video use no longer works. The user needs to enable CMA and use "cma" parameter. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
-rw-r--r--Documentation/arm/OMAP/DSS10
-rw-r--r--drivers/video/omap2/omapfb/Kconfig1
-rw-r--r--drivers/video/omap2/omapfb/omapfb-ioctl.c14
-rw-r--r--drivers/video/omap2/omapfb/omapfb-main.c69
-rw-r--r--drivers/video/omap2/omapfb/omapfb.h5
5 files changed, 52 insertions, 47 deletions
diff --git a/Documentation/arm/OMAP/DSS b/Documentation/arm/OMAP/DSS
index a564ceea9e98..4484e021290e 100644
--- a/Documentation/arm/OMAP/DSS
+++ b/Documentation/arm/OMAP/DSS
@@ -285,7 +285,10 @@ FB0 +-- GFX ---- LCD ---- LCD
Misc notes
----------
-OMAP FB allocates the framebuffer memory using the OMAP VRAM allocator.
+OMAP FB allocates the framebuffer memory using the standard dma allocator. You
+can enable Contiguous Memory Allocator (CONFIG_CMA) to improve the dma
+allocator, and if CMA is enabled, you use "cma=" kernel parameter to increase
+the global memory area for CMA.
Using DSI DPLL to generate pixel clock it is possible produce the pixel clock
of 86.5MHz (max possible), and with that you get 1280x1024@57 output from DVI.
@@ -301,11 +304,6 @@ framebuffer parameters.
Kernel boot arguments
---------------------
-vram=<size>[,<physaddr>]
- - Amount of total VRAM to preallocate and optionally a physical start
- memory address. For example, "10M". omapfb allocates memory for
- framebuffers from VRAM.
-
omapfb.mode=<display>:<mode>[,...]
- Default video mode for specified displays. For example,
"dvi:800x400MR-24@60". See drivers/video/modedb.c.
diff --git a/drivers/video/omap2/omapfb/Kconfig b/drivers/video/omap2/omapfb/Kconfig
index 4ea17dc3258c..4cb12ce68855 100644
--- a/drivers/video/omap2/omapfb/Kconfig
+++ b/drivers/video/omap2/omapfb/Kconfig
@@ -2,7 +2,6 @@ menuconfig FB_OMAP2
tristate "OMAP2+ frame buffer support"
depends on FB && OMAP2_DSS && !DRM_OMAP
- select OMAP2_VRAM
select OMAP2_VRFB if ARCH_OMAP2 || ARCH_OMAP3
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
diff --git a/drivers/video/omap2/omapfb/omapfb-ioctl.c b/drivers/video/omap2/omapfb/omapfb-ioctl.c
index 606b89f12351..574c1708f749 100644
--- a/drivers/video/omap2/omapfb/omapfb-ioctl.c
+++ b/drivers/video/omap2/omapfb/omapfb-ioctl.c
@@ -31,7 +31,6 @@
#include <video/omapdss.h>
#include <plat/vrfb.h>
-#include <plat/vram.h>
#include "omapfb.h"
@@ -853,14 +852,15 @@ int omapfb_ioctl(struct fb_info *fbi, unsigned int cmd, unsigned long arg)
break;
case OMAPFB_GET_VRAM_INFO: {
- unsigned long vram, free, largest;
-
DBG("ioctl GET_VRAM_INFO\n");
- omap_vram_get_info(&vram, &free, &largest);
- p.vram_info.total = vram;
- p.vram_info.free = free;
- p.vram_info.largest_free_block = largest;
+ /*
+ * We don't have the ability to get this vram info anymore.
+ * Fill in something that should keep the applications working.
+ */
+ p.vram_info.total = SZ_1M * 64;
+ p.vram_info.free = SZ_1M * 64;
+ p.vram_info.largest_free_block = SZ_1M * 64;
if (copy_to_user((void __user *)arg, &p.vram_info,
sizeof(p.vram_info)))
diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c
index 16db1589bd91..84c10121de48 100644
--- a/drivers/video/omap2/omapfb/omapfb-main.c
+++ b/drivers/video/omap2/omapfb/omapfb-main.c
@@ -32,7 +32,6 @@
#include <video/omapdss.h>
#include <plat/cpu.h>
-#include <plat/vram.h>
#include <plat/vrfb.h>
#include "omapfb.h"
@@ -1336,24 +1335,25 @@ static void omapfb_free_fbmem(struct fb_info *fbi)
rg = ofbi->region;
- WARN_ON(atomic_read(&rg->map_count));
-
- if (rg->paddr)
- if (omap_vram_free(rg->paddr, rg->size))
- dev_err(fbdev->dev, "VRAM FREE failed\n");
+ if (rg->token == NULL)
+ return;
- if (rg->vaddr)
- iounmap(rg->vaddr);
+ WARN_ON(atomic_read(&rg->map_count));
if (ofbi->rotation_type == OMAP_DSS_ROT_VRFB) {
/* unmap the 0 angle rotation */
if (rg->vrfb.vaddr[0]) {
iounmap(rg->vrfb.vaddr[0]);
- omap_vrfb_release_ctx(&rg->vrfb);
rg->vrfb.vaddr[0] = NULL;
}
+
+ omap_vrfb_release_ctx(&rg->vrfb);
}
+ dma_free_attrs(fbdev->dev, rg->size, rg->token, rg->dma_handle,
+ &rg->attrs);
+
+ rg->token = NULL;
rg->vaddr = NULL;
rg->paddr = 0;
rg->alloc = 0;
@@ -1388,7 +1388,9 @@ static int omapfb_alloc_fbmem(struct fb_info *fbi, unsigned long size,
struct omapfb_info *ofbi = FB2OFB(fbi);
struct omapfb2_device *fbdev = ofbi->fbdev;
struct omapfb2_mem_region *rg;
- void __iomem *vaddr;
+ void *token;
+ DEFINE_DMA_ATTRS(attrs);
+ dma_addr_t dma_handle;
int r;
rg = ofbi->region;
@@ -1403,42 +1405,43 @@ static int omapfb_alloc_fbmem(struct fb_info *fbi, unsigned long size,
size = PAGE_ALIGN(size);
- if (!paddr) {
- DBG("allocating %lu bytes for fb %d\n", size, ofbi->id);
- r = omap_vram_alloc(size, &paddr);
- } else {
- DBG("reserving %lu bytes at %lx for fb %d\n", size, paddr,
- ofbi->id);
- r = omap_vram_reserve(paddr, size);
- }
+ WARN_ONCE(paddr,
+ "reserving memory at predefined address not supported\n");
- if (r) {
+ dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs);
+
+ if (ofbi->rotation_type == OMAP_DSS_ROT_VRFB)
+ dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &attrs);
+
+ DBG("allocating %lu bytes for fb %d\n", size, ofbi->id);
+
+ token = dma_alloc_attrs(fbdev->dev, size, &dma_handle,
+ GFP_KERNEL, &attrs);
+
+ if (token == NULL) {
dev_err(fbdev->dev, "failed to allocate framebuffer\n");
return -ENOMEM;
}
- if (ofbi->rotation_type != OMAP_DSS_ROT_VRFB) {
- vaddr = ioremap_wc(paddr, size);
-
- if (!vaddr) {
- dev_err(fbdev->dev, "failed to ioremap framebuffer\n");
- omap_vram_free(paddr, size);
- return -ENOMEM;
- }
+ DBG("allocated VRAM paddr %lx, vaddr %p\n",
+ (unsigned long)dma_handle, token);
- DBG("allocated VRAM paddr %lx, vaddr %p\n", paddr, vaddr);
- } else {
+ if (ofbi->rotation_type == OMAP_DSS_ROT_VRFB) {
r = omap_vrfb_request_ctx(&rg->vrfb);
if (r) {
+ dma_free_attrs(fbdev->dev, size, token, dma_handle,
+ &attrs);
dev_err(fbdev->dev, "vrfb create ctx failed\n");
return r;
}
-
- vaddr = NULL;
}
- rg->paddr = paddr;
- rg->vaddr = vaddr;
+ rg->attrs = attrs;
+ rg->token = token;
+ rg->dma_handle = dma_handle;
+
+ rg->paddr = (unsigned long)dma_handle;
+ rg->vaddr = (void __iomem *)token;
rg->size = size;
rg->alloc = 1;
diff --git a/drivers/video/omap2/omapfb/omapfb.h b/drivers/video/omap2/omapfb/omapfb.h
index 5ced9b334d35..5f72bf9017fc 100644
--- a/drivers/video/omap2/omapfb/omapfb.h
+++ b/drivers/video/omap2/omapfb/omapfb.h
@@ -28,6 +28,8 @@
#endif
#include <linux/rwsem.h>
+#include <linux/dma-attrs.h>
+#include <linux/dma-mapping.h>
#include <video/omapdss.h>
@@ -49,6 +51,9 @@ extern bool omapfb_debug;
struct omapfb2_mem_region {
int id;
+ struct dma_attrs attrs;
+ void *token;
+ dma_addr_t dma_handle;
u32 paddr;
void __iomem *vaddr;
struct vrfb vrfb;