drivers/gpu/drm/mgag200/mgag200_main.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright 2010 Matt Turner.
   4  * Copyright 2012 Red Hat
   5  *
   6  * Authors: Matthew Garrett
   7  *          Matt Turner
   8  *          Dave Airlie
   9  */
  10
  11 #include <linux/pci.h>
  12
  13 #include <drm/drm_crtc_helper.h>
  14 #include <drm/drm_gem_framebuffer_helper.h>
  15
  16 #include "mgag200_drv.h"
  17
  18 static const struct drm_mode_config_funcs mga_mode_funcs = {
  19         .fb_create = drm_gem_fb_create
  20 };
  21
  22 static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
  23 {
  24         int offset;
  25         int orig;
  26         int test1, test2;
  27         int orig1, orig2;
  28         unsigned int vram_size;
  29
  30         /* Probe */
  31         orig = ioread16(mem);
  32         iowrite16(0, mem);
  33
  34         vram_size = mdev->mc.vram_window;
  35
  36         if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
  37                 vram_size = vram_size - 0x400000;
  38         }
  39
  40         for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
  41                 orig1 = ioread8(mem + offset);
  42                 orig2 = ioread8(mem + offset + 0x100);
  43
  44                 iowrite16(0xaa55, mem + offset);
  45                 iowrite16(0xaa55, mem + offset + 0x100);
  46
  47                 test1 = ioread16(mem + offset);
  48                 test2 = ioread16(mem);
  49
  50                 iowrite16(orig1, mem + offset);
  51                 iowrite16(orig2, mem + offset + 0x100);
  52
  53                 if (test1 != 0xaa55) {
  54                         break;
  55                 }
  56
  57                 if (test2) {
  58                         break;
  59                 }
  60         }
  61
  62         iowrite16(orig, mem);
  63         return offset - 65536;
  64 }
  65
  66 /* Map the framebuffer from the card and configure the core */
  67 static int mga_vram_init(struct mga_device *mdev)
  68 {
  69         void __iomem *mem;
  70
  71         /* BAR 0 is VRAM */
  72         mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
  73         mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
  74
  75         if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
  76                                 "mgadrmfb_vram")) {
  77                 DRM_ERROR("can't reserve VRAM\n");
  78                 return -ENXIO;
  79         }
  80
  81         mem = pci_iomap(mdev->dev->pdev, 0, 0);
  82         if (!mem)
  83                 return -ENOMEM;
  84
  85         mdev->mc.vram_size = mga_probe_vram(mdev, mem);
  86
  87         pci_iounmap(mdev->dev->pdev, mem);
  88
  89         return 0;
  90 }
  91
  92 static int mgag200_device_init(struct drm_device *dev,
  93                                uint32_t flags)
  94 {
  95         struct mga_device *mdev = dev->dev_private;
  96         int ret, option;
  97
  98         mdev->flags = mgag200_flags_from_driver_data(flags);
  99         mdev->type = mgag200_type_from_driver_data(flags);
 100
 101         /* Hardcode the number of CRTCs to 1 */
 102         mdev->num_crtc = 1;
 103
 104         pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
 105         mdev->has_sdram = !(option & (1 << 14));
 106
 107         /* BAR 0 is the framebuffer, BAR 1 contains registers */
 108         mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
 109         mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
 110
 111         if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
 112                                 "mgadrmfb_mmio")) {
 113                 DRM_ERROR("can't reserve mmio registers\n");
 114                 return -ENOMEM;
 115         }
 116
 117         mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
 118         if (mdev->rmmio == NULL)
 119                 return -ENOMEM;
 120
 121         /* stash G200 SE model number for later use */
 122         if (IS_G200_SE(mdev)) {
 123                 mdev->unique_rev_id = RREG32(0x1e24);
 124                 DRM_DEBUG("G200 SE unique revision id is 0x%x\n",
 125                           mdev->unique_rev_id);
 126         }
 127
 128         ret = mga_vram_init(mdev);
 129         if (ret)
 130                 return ret;
 131
 132         mdev->bpp_shifts[0] = 0;
 133         mdev->bpp_shifts[1] = 1;
 134         mdev->bpp_shifts[2] = 0;
 135         mdev->bpp_shifts[3] = 2;
 136         return 0;
 137 }
 138
 139 /*
 140  * Functions here will be called by the core once it's bound the driver to
 141  * a PCI device
 142  */
 143
 144
 145 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
 146 {
 147         struct mga_device *mdev;
 148         int r;
 149
 150         mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
 151         if (mdev == NULL)
 152                 return -ENOMEM;
 153         dev->dev_private = (void *)mdev;
 154         mdev->dev = dev;
 155
 156         r = mgag200_device_init(dev, flags);
 157         if (r) {
 158                 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
 159                 return r;
 160         }
 161         r = mgag200_mm_init(mdev);
 162         if (r)
 163                 goto err_mm;
 164
 165         drm_mode_config_init(dev);
 166         dev->mode_config.funcs = (void *)&mga_mode_funcs;
 167         if (IS_G200_SE(mdev) && mdev->vram_fb_available < (2048*1024))
 168                 dev->mode_config.preferred_depth = 16;
 169         else
 170                 dev->mode_config.preferred_depth = 32;
 171         dev->mode_config.prefer_shadow = 1;
 172
 173         r = mgag200_modeset_init(mdev);
 174         if (r) {
 175                 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
 176                 goto err_modeset;
 177         }
 178
 179         r = mgag200_cursor_init(mdev);
 180         if (r)
 181                 dev_warn(&dev->pdev->dev,
 182                         "Could not initialize cursors. Not doing hardware cursors.\n");
 183
 184         r = drm_fbdev_generic_setup(mdev->dev, 0);
 185         if (r)
 186                 goto err_modeset;
 187
 188         return 0;
 189
 190 err_modeset:
 191         drm_mode_config_cleanup(dev);
 192         mgag200_cursor_fini(mdev);
 193         mgag200_mm_fini(mdev);
 194 err_mm:
 195         dev->dev_private = NULL;
 196
 197         return r;
 198 }
 199
 200 void mgag200_driver_unload(struct drm_device *dev)
 201 {
 202         struct mga_device *mdev = dev->dev_private;
 203
 204         if (mdev == NULL)
 205                 return;
 206         mgag200_modeset_fini(mdev);
 207         drm_mode_config_cleanup(dev);
 208         mgag200_cursor_fini(mdev);
 209         mgag200_mm_fini(mdev);
 210         dev->dev_private = NULL;
 211 }