1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright 2010 Matt Turner.
4 * Copyright 2012 Red Hat
6 * Authors: Matthew Garrett
11 #include <drm/drm_crtc_helper.h>
12 #include <drm/drm_gem_framebuffer_helper.h>
13 #include <drm/drm_pci.h>
15 #include "mgag200_drv.h"
17 static const struct drm_mode_config_funcs mga_mode_funcs = {
18 .fb_create = drm_gem_fb_create
21 static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
27 unsigned int vram_size;
33 vram_size = mdev->mc.vram_window;
35 if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
36 vram_size = vram_size - 0x400000;
39 for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
40 orig1 = ioread8(mem + offset);
41 orig2 = ioread8(mem + offset + 0x100);
43 iowrite16(0xaa55, mem + offset);
44 iowrite16(0xaa55, mem + offset + 0x100);
46 test1 = ioread16(mem + offset);
47 test2 = ioread16(mem);
49 iowrite16(orig1, mem + offset);
50 iowrite16(orig2, mem + offset + 0x100);
52 if (test1 != 0xaa55) {
62 return offset - 65536;
65 /* Map the framebuffer from the card and configure the core */
66 static int mga_vram_init(struct mga_device *mdev)
71 mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
72 mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
74 if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
76 DRM_ERROR("can't reserve VRAM\n");
80 mem = pci_iomap(mdev->dev->pdev, 0, 0);
84 mdev->mc.vram_size = mga_probe_vram(mdev, mem);
86 pci_iounmap(mdev->dev->pdev, mem);
91 static int mgag200_device_init(struct drm_device *dev,
94 struct mga_device *mdev = dev->dev_private;
99 /* Hardcode the number of CRTCs to 1 */
102 pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
103 mdev->has_sdram = !(option & (1 << 14));
105 /* BAR 0 is the framebuffer, BAR 1 contains registers */
106 mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
107 mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
109 if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
111 DRM_ERROR("can't reserve mmio registers\n");
115 mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
116 if (mdev->rmmio == NULL)
119 /* stash G200 SE model number for later use */
120 if (IS_G200_SE(mdev))
121 mdev->unique_rev_id = RREG32(0x1e24);
123 ret = mga_vram_init(mdev);
127 mdev->bpp_shifts[0] = 0;
128 mdev->bpp_shifts[1] = 1;
129 mdev->bpp_shifts[2] = 0;
130 mdev->bpp_shifts[3] = 2;
135 * Functions here will be called by the core once it's bound the driver to
140 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
142 struct mga_device *mdev;
145 mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
148 dev->dev_private = (void *)mdev;
151 r = mgag200_device_init(dev, flags);
153 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
156 r = mgag200_mm_init(mdev);
160 drm_mode_config_init(dev);
161 dev->mode_config.funcs = (void *)&mga_mode_funcs;
162 if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
163 dev->mode_config.preferred_depth = 16;
165 dev->mode_config.preferred_depth = 32;
166 dev->mode_config.prefer_shadow = 1;
168 r = mgag200_modeset_init(mdev);
170 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
174 /* Make small buffers to store a hardware cursor (double buffered icon updates) */
175 mdev->cursor.pixels_1 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
176 roundup(48*64, PAGE_SIZE),
178 mdev->cursor.pixels_2 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
179 roundup(48*64, PAGE_SIZE),
181 if (IS_ERR(mdev->cursor.pixels_2) || IS_ERR(mdev->cursor.pixels_1)) {
182 mdev->cursor.pixels_1 = NULL;
183 mdev->cursor.pixels_2 = NULL;
184 dev_warn(&dev->pdev->dev,
185 "Could not allocate space for cursors. Not doing hardware cursors.\n");
187 mdev->cursor.pixels_current = NULL;
189 r = drm_fbdev_generic_setup(mdev->dev, 0);
196 drm_mode_config_cleanup(dev);
197 mgag200_mm_fini(mdev);
199 dev->dev_private = NULL;
204 void mgag200_driver_unload(struct drm_device *dev)
206 struct mga_device *mdev = dev->dev_private;
210 mgag200_modeset_fini(mdev);
211 drm_mode_config_cleanup(dev);
212 mgag200_mm_fini(mdev);
213 dev->dev_private = NULL;