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 <drm/drm_crtc_helper.h>
12 #include <drm/drm_gem_framebuffer_helper.h>
13 #include <drm/drm_pci.h>
14
15 #include "mgag200_drv.h"
16
17 static const struct drm_mode_config_funcs mga_mode_funcs = {
18 .fb_create = drm_gem_fb_create
19 };
20
mga_probe_vram(struct mga_device * mdev,void __iomem * mem)21 static int mga_probe_vram(struct mga_device *mdev, void __iomem *mem)
22 {
23 int offset;
24 int orig;
25 int test1, test2;
26 int orig1, orig2;
27 unsigned int vram_size;
28
29 /* Probe */
30 orig = ioread16(mem);
31 iowrite16(0, mem);
32
33 vram_size = mdev->mc.vram_window;
34
35 if ((mdev->type == G200_EW3) && (vram_size >= 0x1000000)) {
36 vram_size = vram_size - 0x400000;
37 }
38
39 for (offset = 0x100000; offset < vram_size; offset += 0x4000) {
40 orig1 = ioread8(mem + offset);
41 orig2 = ioread8(mem + offset + 0x100);
42
43 iowrite16(0xaa55, mem + offset);
44 iowrite16(0xaa55, mem + offset + 0x100);
45
46 test1 = ioread16(mem + offset);
47 test2 = ioread16(mem);
48
49 iowrite16(orig1, mem + offset);
50 iowrite16(orig2, mem + offset + 0x100);
51
52 if (test1 != 0xaa55) {
53 break;
54 }
55
56 if (test2) {
57 break;
58 }
59 }
60
61 iowrite16(orig, mem);
62 return offset - 65536;
63 }
64
65 /* Map the framebuffer from the card and configure the core */
mga_vram_init(struct mga_device * mdev)66 static int mga_vram_init(struct mga_device *mdev)
67 {
68 void __iomem *mem;
69
70 /* BAR 0 is VRAM */
71 mdev->mc.vram_base = pci_resource_start(mdev->dev->pdev, 0);
72 mdev->mc.vram_window = pci_resource_len(mdev->dev->pdev, 0);
73
74 if (!devm_request_mem_region(mdev->dev->dev, mdev->mc.vram_base, mdev->mc.vram_window,
75 "mgadrmfb_vram")) {
76 DRM_ERROR("can't reserve VRAM\n");
77 return -ENXIO;
78 }
79
80 mem = pci_iomap(mdev->dev->pdev, 0, 0);
81 if (!mem)
82 return -ENOMEM;
83
84 mdev->mc.vram_size = mga_probe_vram(mdev, mem);
85
86 pci_iounmap(mdev->dev->pdev, mem);
87
88 return 0;
89 }
90
mgag200_device_init(struct drm_device * dev,uint32_t flags)91 static int mgag200_device_init(struct drm_device *dev,
92 uint32_t flags)
93 {
94 struct mga_device *mdev = dev->dev_private;
95 int ret, option;
96
97 mdev->type = flags;
98
99 /* Hardcode the number of CRTCs to 1 */
100 mdev->num_crtc = 1;
101
102 pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
103 mdev->has_sdram = !(option & (1 << 14));
104
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);
108
109 if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
110 "mgadrmfb_mmio")) {
111 DRM_ERROR("can't reserve mmio registers\n");
112 return -ENOMEM;
113 }
114
115 mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
116 if (mdev->rmmio == NULL)
117 return -ENOMEM;
118
119 /* stash G200 SE model number for later use */
120 if (IS_G200_SE(mdev))
121 mdev->unique_rev_id = RREG32(0x1e24);
122
123 ret = mga_vram_init(mdev);
124 if (ret)
125 return ret;
126
127 mdev->bpp_shifts[0] = 0;
128 mdev->bpp_shifts[1] = 1;
129 mdev->bpp_shifts[2] = 0;
130 mdev->bpp_shifts[3] = 2;
131 return 0;
132 }
133
134 /*
135 * Functions here will be called by the core once it's bound the driver to
136 * a PCI device
137 */
138
139
mgag200_driver_load(struct drm_device * dev,unsigned long flags)140 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
141 {
142 struct mga_device *mdev;
143 int r;
144
145 mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
146 if (mdev == NULL)
147 return -ENOMEM;
148 dev->dev_private = (void *)mdev;
149 mdev->dev = dev;
150
151 r = mgag200_device_init(dev, flags);
152 if (r) {
153 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
154 return r;
155 }
156 r = mgag200_mm_init(mdev);
157 if (r)
158 goto err_mm;
159
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;
164 else
165 dev->mode_config.preferred_depth = 32;
166 dev->mode_config.prefer_shadow = 1;
167
168 r = mgag200_modeset_init(mdev);
169 if (r) {
170 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
171 goto err_modeset;
172 }
173
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),
177 0, 0);
178 mdev->cursor.pixels_2 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
179 roundup(48*64, PAGE_SIZE),
180 0, 0);
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");
186 }
187 mdev->cursor.pixels_current = NULL;
188
189 r = drm_fbdev_generic_setup(mdev->dev, 0);
190 if (r)
191 goto err_modeset;
192
193 return 0;
194
195 err_modeset:
196 drm_mode_config_cleanup(dev);
197 mgag200_mm_fini(mdev);
198 err_mm:
199 dev->dev_private = NULL;
200
201 return r;
202 }
203
mgag200_driver_unload(struct drm_device * dev)204 void mgag200_driver_unload(struct drm_device *dev)
205 {
206 struct mga_device *mdev = dev->dev_private;
207
208 if (mdev == NULL)
209 return;
210 mgag200_modeset_fini(mdev);
211 drm_mode_config_cleanup(dev);
212 mgag200_mm_fini(mdev);
213 dev->dev_private = NULL;
214 }
215
