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