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->flags = mgag200_flags_from_driver_data(flags);
98 mdev->type = mgag200_type_from_driver_data(flags);
99
100 /* Hardcode the number of CRTCs to 1 */
101 mdev->num_crtc = 1;
102
103 pci_read_config_dword(dev->pdev, PCI_MGA_OPTION, &option);
104 mdev->has_sdram = !(option & (1 << 14));
105
106 /* BAR 0 is the framebuffer, BAR 1 contains registers */
107 mdev->rmmio_base = pci_resource_start(mdev->dev->pdev, 1);
108 mdev->rmmio_size = pci_resource_len(mdev->dev->pdev, 1);
109
110 if (!devm_request_mem_region(mdev->dev->dev, mdev->rmmio_base, mdev->rmmio_size,
111 "mgadrmfb_mmio")) {
112 DRM_ERROR("can't reserve mmio registers\n");
113 return -ENOMEM;
114 }
115
116 mdev->rmmio = pcim_iomap(dev->pdev, 1, 0);
117 if (mdev->rmmio == NULL)
118 return -ENOMEM;
119
120 /* stash G200 SE model number for later use */
121 if (IS_G200_SE(mdev))
122 mdev->unique_rev_id = RREG32(0x1e24);
123
124 ret = mga_vram_init(mdev);
125 if (ret)
126 return ret;
127
128 mdev->bpp_shifts[0] = 0;
129 mdev->bpp_shifts[1] = 1;
130 mdev->bpp_shifts[2] = 0;
131 mdev->bpp_shifts[3] = 2;
132 return 0;
133 }
134
135 /*
136 * Functions here will be called by the core once it's bound the driver to
137 * a PCI device
138 */
139
140
mgag200_driver_load(struct drm_device * dev,unsigned long flags)141 int mgag200_driver_load(struct drm_device *dev, unsigned long flags)
142 {
143 struct mga_device *mdev;
144 int r;
145
146 mdev = devm_kzalloc(dev->dev, sizeof(struct mga_device), GFP_KERNEL);
147 if (mdev == NULL)
148 return -ENOMEM;
149 dev->dev_private = (void *)mdev;
150 mdev->dev = dev;
151
152 r = mgag200_device_init(dev, flags);
153 if (r) {
154 dev_err(&dev->pdev->dev, "Fatal error during GPU init: %d\n", r);
155 return r;
156 }
157 r = mgag200_mm_init(mdev);
158 if (r)
159 goto err_mm;
160
161 drm_mode_config_init(dev);
162 dev->mode_config.funcs = (void *)&mga_mode_funcs;
163 if (IS_G200_SE(mdev) && mdev->mc.vram_size < (2048*1024))
164 dev->mode_config.preferred_depth = 16;
165 else
166 dev->mode_config.preferred_depth = 32;
167 dev->mode_config.prefer_shadow = 1;
168
169 r = mgag200_modeset_init(mdev);
170 if (r) {
171 dev_err(&dev->pdev->dev, "Fatal error during modeset init: %d\n", r);
172 goto err_modeset;
173 }
174
175 /* Make small buffers to store a hardware cursor (double buffered icon updates) */
176 mdev->cursor.pixels_1 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
177 roundup(48*64, PAGE_SIZE),
178 0, 0);
179 mdev->cursor.pixels_2 = drm_gem_vram_create(dev, &dev->vram_mm->bdev,
180 roundup(48*64, PAGE_SIZE),
181 0, 0);
182 if (IS_ERR(mdev->cursor.pixels_2) || IS_ERR(mdev->cursor.pixels_1)) {
183 mdev->cursor.pixels_1 = NULL;
184 mdev->cursor.pixels_2 = NULL;
185 dev_warn(&dev->pdev->dev,
186 "Could not allocate space for cursors. Not doing hardware cursors.\n");
187 }
188 mdev->cursor.pixels_current = NULL;
189
190 r = drm_fbdev_generic_setup(mdev->dev, 0);
191 if (r)
192 goto err_modeset;
193
194 return 0;
195
196 err_modeset:
197 drm_mode_config_cleanup(dev);
198 mgag200_mm_fini(mdev);
199 err_mm:
200 dev->dev_private = NULL;
201
202 return r;
203 }
204
mgag200_driver_unload(struct drm_device * dev)205 void mgag200_driver_unload(struct drm_device *dev)
206 {
207 struct mga_device *mdev = dev->dev_private;
208
209 if (mdev == NULL)
210 return;
211 mgag200_modeset_fini(mdev);
212 drm_mode_config_cleanup(dev);
213 mgag200_mm_fini(mdev);
214 dev->dev_private = NULL;
215 }
216