LXR linux/drivers/gpu/drm/mgag200/mgag200

   1/*
   2 * Copyright 2012 Red Hat Inc.
   3 *
   4 * Permission is hereby granted, free of charge, to any person obtaining a
   5 * copy of this software and associated documentation files (the
   6 * "Software"), to deal in the Software without restriction, including
   7 * without limitation the rights to use, copy, modify, merge, publish,
   8 * distribute, sub license, and/or sell copies of the Software, and to
   9 * permit persons to whom the Software is furnished to do so, subject to
  10 * the following conditions:
  11 *
  12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
  15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
  16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
  19 *
  20 * The above copyright notice and this permission notice (including the
  21 * next paragraph) shall be included in all copies or substantial portions
  22 * of the Software.
  23 *
  24 */
  25/*
  26 * Authors: Dave Airlie <airlied@redhat.com>
  27 */
  28
  29#include <linux/pci.h>
  30
  31#include <drm/drm_managed.h>
  32
  33#include "mgag200_drv.h"
  34
  35static size_t mgag200_probe_vram(struct mga_device *mdev, void __iomem *mem,
  36                                 size_t size)
  37{
  38        int offset;
  39        int orig;
  40        int test1, test2;
  41        int orig1, orig2;
  42        size_t vram_size;
  43
  44        /* Probe */
  45        orig = ioread16(mem);
  46        iowrite16(0, mem);
  47
  48        vram_size = size;
  49
  50        if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000))
  51                vram_size = vram_size - 0x400000;
  52
  53        for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
  54                orig1 = ioread8(mem + offset);
  55                orig2 = ioread8(mem + offset + 0x100);
  56
  57                iowrite16(0xaa55, mem + offset);
  58                iowrite16(0xaa55, mem + offset + 0x100);
  59
  60                test1 = ioread16(mem + offset);
  61                test2 = ioread16(mem);
  62
  63                iowrite16(orig1, mem + offset);
  64                iowrite16(orig2, mem + offset + 0x100);
  65
  66                if (test1 != 0xaa55)
  67                        break;
  68
  69                if (test2)
  70                        break;
  71        }
  72
  73        iowrite16(orig, mem);
  74
  75        return offset - 65536;
  76}
  77
  78static void mgag200_mm_release(struct drm_device *dev, void *ptr)
  79{
  80        struct mga_device *mdev = to_mga_device(dev);
  81        struct pci_dev *pdev = to_pci_dev(dev->dev);
  82
  83        mdev->vram_fb_available = 0;
  84        iounmap(mdev->vram);
  85        arch_io_free_memtype_wc(pci_resource_start(pdev, 0),
  86                                pci_resource_len(pdev, 0));
  87        arch_phys_wc_del(mdev->fb_mtrr);
  88        mdev->fb_mtrr = 0;
  89}
  90
  91int mgag200_mm_init(struct mga_device *mdev)
  92{
  93        struct drm_device *dev = &mdev->base;
  94        struct pci_dev *pdev = to_pci_dev(dev->dev);
  95        u8 misc;
  96        resource_size_t start, len;
  97        int ret;
  98
  99        WREG_ECRT(0x04, 0x00);
 100
 101        misc = RREG8(MGA_MISC_IN);
 102        misc |= MGAREG_MISC_RAMMAPEN |
 103                MGAREG_MISC_HIGH_PG_SEL;
 104        WREG8(MGA_MISC_OUT, misc);
 105
 106        /* BAR 0 is VRAM */
 107        start = pci_resource_start(pdev, 0);
 108        len = pci_resource_len(pdev, 0);
 109
 110        if (!devm_request_mem_region(dev->dev, start, len, "mgadrmfb_vram")) {
 111                drm_err(dev, "can't reserve VRAM\n");
 112                return -ENXIO;
 113        }
 114
 115        arch_io_reserve_memtype_wc(start, len);
 116
 117        mdev->fb_mtrr = arch_phys_wc_add(start, len);
 118
 119        mdev->vram = ioremap(start, len);
 120        if (!mdev->vram) {
 121                ret = -ENOMEM;
 122                goto err_arch_phys_wc_del;
 123        }
 124
 125        mdev->mc.vram_size = mgag200_probe_vram(mdev, mdev->vram, len);
 126        mdev->mc.vram_base = start;
 127        mdev->mc.vram_window = len;
 128
 129        mdev->vram_fb_available = mdev->mc.vram_size;
 130
 131        return drmm_add_action_or_reset(dev, mgag200_mm_release, NULL);
 132
 133err_arch_phys_wc_del:
 134        arch_phys_wc_del(mdev->fb_mtrr);
 135        arch_io_free_memtype_wc(start, len);
 136        return ret;
 137}
 138