drivers/gpu/drm/mgag200/mgag200_mm.c

   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
  35 static 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
  78 static void mgag200_mm_release(struct drm_device *dev, void *ptr)
  79 {
  80         struct mga_device *mdev = to_mga_device(dev);
  81
  82         mdev->vram_fb_available = 0;
  83         iounmap(mdev->vram);
  84         arch_io_free_memtype_wc(pci_resource_start(dev->pdev, 0),
  85                                 pci_resource_len(dev->pdev, 0));
  86         arch_phys_wc_del(mdev->fb_mtrr);
  87         mdev->fb_mtrr = 0;
  88 }
  89
  90 int mgag200_mm_init(struct mga_device *mdev)
  91 {
  92         struct drm_device *dev = &mdev->base;
  93         u8 misc;
  94         resource_size_t start, len;
  95         int ret;
  96
  97         WREG_ECRT(0x04, 0x00);
  98
  99         misc = RREG8(MGA_MISC_IN);
 100         misc |= MGAREG_MISC_RAMMAPEN |
 101                 MGAREG_MISC_HIGH_PG_SEL;
 102         WREG8(MGA_MISC_OUT, misc);
 103
 104         /* BAR 0 is VRAM */
 105         start = pci_resource_start(dev->pdev, 0);
 106         len = pci_resource_len(dev->pdev, 0);
 107
 108         if (!devm_request_mem_region(dev->dev, start, len, "mgadrmfb_vram")) {
 109                 drm_err(dev, "can't reserve VRAM\n");
 110                 return -ENXIO;
 111         }
 112
 113         arch_io_reserve_memtype_wc(start, len);
 114
 115         mdev->fb_mtrr = arch_phys_wc_add(start, len);
 116
 117         mdev->vram = ioremap(start, len);
 118         if (!mdev->vram) {
 119                 ret = -ENOMEM;
 120                 goto err_arch_phys_wc_del;
 121         }
 122
 123         mdev->mc.vram_size = mgag200_probe_vram(mdev, mdev->vram, len);
 124         mdev->mc.vram_base = start;
 125         mdev->mc.vram_window = len;
 126
 127         mdev->vram_fb_available = mdev->mc.vram_size;
 128
 129         return drmm_add_action_or_reset(dev, mgag200_mm_release, NULL);
 130
 131 err_arch_phys_wc_del:
 132         arch_phys_wc_del(mdev->fb_mtrr);
 133         arch_io_free_memtype_wc(start, len);
 134         return ret;
 135 }