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/*
* Copyright 2012 Red Hat Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
*/
/*
* Authors: Dave Airlie <airlied@redhat.com>
*/
#include <linux/pci.h>
#include <drm/drm_managed.h>
#include "mgag200_drv.h"
static size_t mgag200_probe_vram(struct mga_device *mdev, void __iomem *mem,
size_t size)
{
int offset;
int orig;
int test1, test2;
int orig1, orig2;
size_t vram_size;
/* Probe */
orig = ioread16(mem);
iowrite16(0, mem);
vram_size = size;
if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000))
vram_size = vram_size - 0x400000;
for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
orig1 = ioread8(mem + offset);
orig2 = ioread8(mem + offset + 0x100);
iowrite16(0xaa55, mem + offset);
iowrite16(0xaa55, mem + offset + 0x100);
test1 = ioread16(mem + offset);
test2 = ioread16(mem);
iowrite16(orig1, mem + offset);
iowrite16(orig2, mem + offset + 0x100);
if (test1 != 0xaa55)
break;
if (test2)
break;
}
iowrite16(orig, mem);
return offset - 65536;
}
int mgag200_mm_init(struct mga_device *mdev)
{
struct drm_device *dev = &mdev->base;
struct pci_dev *pdev = to_pci_dev(dev->dev);
u8 misc;
resource_size_t start, len;
WREG_ECRT(0x04, 0x00);
misc = RREG8(MGA_MISC_IN);
misc |= MGAREG_MISC_RAMMAPEN |
MGAREG_MISC_HIGH_PG_SEL;
WREG8(MGA_MISC_OUT, misc);
/* BAR 0 is VRAM */
start = pci_resource_start(pdev, 0);
len = pci_resource_len(pdev, 0);
if (!devm_request_mem_region(dev->dev, start, len, "mgadrmfb_vram")) {
drm_err(dev, "can't reserve VRAM\n");
return -ENXIO;
}
/* Don't fail on errors, but performance might be reduced. */
devm_arch_io_reserve_memtype_wc(dev->dev, start, len);
devm_arch_phys_wc_add(dev->dev, start, len);
mdev->vram = devm_ioremap(dev->dev, start, len);
if (!mdev->vram)
return -ENOMEM;
mdev->mc.vram_size = mgag200_probe_vram(mdev, mdev->vram, len);
mdev->mc.vram_base = start;
mdev->mc.vram_window = len;
mdev->vram_fb_available = mdev->mc.vram_size;
return 0;
}
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