[PATCH] nouveau: fix OpenFirmware support

[Laurent Vivier]

On PowerMac G5 (and I think on all OpenFirmware platforms), nvbios_pcirTp()
returns NULL. But in fact the OpenFirmware has given us the size
we can store in image->size.

This size is stored in bios->size by of_init() as there is no way
to retrieve it otherwise. And as we know the size, copy all data
to bios->data.

Tested on PowerMac G5 with 64bit kernel and a NV43 card (GeForce 6600 LE).

Before:

    nouveau 0000:0a:00.0: NVIDIA NV43 (043200a4)
    u3msi: allocated virq 0x19 (hw 0x8) addr 0xf8004080
    nouveau 0000:0a:00.0: Invalid ROM contents
    nouveau 0000:0a:00.0: bios: unable to locate usable image
    nouveau 0000:0a:00.0: bios ctor failed, -22
    nouveau: probe of 0000:0a:00.0 failed with error -22

After:

    nouveau 0000:0a:00.0: NVIDIA NV43 (043200a4)
    u3msi: allocated virq 0x19 (hw 0x8) addr 0xf8004080
    nouveau 0000:0a:00.0: bios: version 05.43.02.75.00
    nouveau 0000:0a:00.0: fb: 128 MiB DDR1
    nouveau 0000:0a:00.0: Using 32-bit DMA via iommu
    [TTM] Zone  kernel: Available graphics memory: 5610528 kiB
    [TTM] Zone   dma32: Available graphics memory: 2097152 kiB
    [TTM] Initializing pool allocator
    [TTM] Initializing DMA pool allocator
    nouveau 0000:0a:00.0: DRM: VRAM: 124 MiB
    nouveau 0000:0a:00.0: DRM: GART: 512 MiB
    nouveau 0000:0a:00.0: DRM: TMDS table version 1.1
    nouveau 0000:0a:00.0: DRM: DCB version 3.0
    nouveau 0000:0a:00.0: DRM: DCB outp 00: 01000100 00000028
    nouveau 0000:0a:00.0: DRM: DCB outp 01: 03000102 00000000
    nouveau 0000:0a:00.0: DRM: DCB outp 02: 04011210 00000028
    nouveau 0000:0a:00.0: DRM: DCB outp 03: 02111212 02000100
    nouveau 0000:0a:00.0: DRM: DCB outp 04: 02011211 0020c070
    nouveau 0000:0a:00.0: DRM: DCB conn 00: 1030
    nouveau 0000:0a:00.0: DRM: DCB conn 01: 2130
    [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
    [drm] Driver supports precise vblank timestamp query.
    nouveau 0000:0a:00.0: DRM: 0x14C5: Parsing digital output script table
    nouveau 0000:0a:00.0: DRM: MM: using M2MF for buffer copies
    nouveau 0000:0a:00.0: DRM: Setting dpms mode 3 on TV encoder (output 4)
    nouveau 0000:0a:00.0: DRM: allocated 1680x1050 fb: 0x30000, bo c00000000399d800
    nouveau 0000:0a:00.0: DRM: 0x14C5: Parsing digital output script table
    Console: switching to colour frame buffer device 210x65
    nouveau 0000:0a:00.0: fb0: nouveaufb frame buffer device
    [drm] Initialized nouveau 1.3.0 20120801 for 0000:0a:00.0 on minor 0

Signed-off-by: Laurent Vivier <laurent at vivier.eu>
---
 drivers/gpu/drm/nouveau/nvkm/subdev/bios/image.c    | 10 ++++++++--
 drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c |  8 ++++++--
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/image.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/image.c
index 74b14cf..17ba0c726 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/image.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/image.c
@@ -47,8 +47,14 @@ nvbios_imagen(struct nvkm_bios *bios, struct nvbios_image *image)
 		return false;
 	}
 
-	if (!(data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir)))
-		return false;
+	data = nvbios_pcirTp(bios, image->base, &ver, &hdr, &pcir);
+	if (!data) {
+		image->size = bios->size;
+		image->type = 0x00;
+		image->last = true;
+
+		return true;
+	}
 	image->size = pcir.image_size;
 	image->type = pcir.image_type;
 	image->last = pcir.last;
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
index bd60d7d..d4c8801 100644
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/shadowof.c
@@ -34,7 +34,6 @@ of_read(void *data, u32 offset, u32 length, struct nvkm_bios *bios)
 {
 	struct priv *priv = data;
 	if (offset + length <= priv->size) {
-		memcpy_fromio(bios->data + offset, priv->data + offset, length);
 		return length;
 	}
 	return 0;
@@ -50,8 +49,13 @@ of_init(struct nvkm_bios *bios, const char *name)
 		return ERR_PTR(-ENODEV);
 	if (!(priv = kzalloc(sizeof(*priv), GFP_KERNEL)))
 		return ERR_PTR(-ENOMEM);
-	if ((priv->data = of_get_property(dn, "NVDA,BMP", &priv->size)))
+	priv->data = of_get_property(dn, "NVDA,BMP", &priv->size);
+	if (priv->data) {
+		bios->size = (priv->size + 3) & ~3;
+		bios->data = kmalloc(bios->size, GFP_KERNEL);
+		memcpy(bios->data, priv->data, priv->size);
 		return priv;
+	}
 	kfree(priv);
 	return ERR_PTR(-EINVAL);
 }
-- 
2.4.3