Remove pointless casts from void pointers
[linux-2.6] / drivers / video / sunxvr500.c
1 /* sunxvr500.c: Sun 3DLABS XVR-500 Expert3D driver for sparc64 systems
2  *
3  * Copyright (C) 2007 David S. Miller (davem@davemloft.net)
4  */
5
6 #include <linux/module.h>
7 #include <linux/kernel.h>
8 #include <linux/slab.h>
9 #include <linux/fb.h>
10 #include <linux/pci.h>
11 #include <linux/init.h>
12
13 #include <asm/io.h>
14 #include <asm/prom.h>
15 #include <asm/of_device.h>
16
17 /* XXX This device has a 'dev-comm' property which aparently is
18  * XXX a pointer into the openfirmware's address space which is
19  * XXX a shared area the kernel driver can use to keep OBP
20  * XXX informed about the current resolution setting.  The idea
21  * XXX is that the kernel can change resolutions, and as long
22  * XXX as the values in the 'dev-comm' area are accurate then
23  * XXX OBP can still render text properly to the console.
24  * XXX
25  * XXX I'm still working out the layout of this and whether there
26  * XXX are any signatures we need to look for etc.
27  */
28 struct e3d_info {
29         struct fb_info          *info;
30         struct pci_dev          *pdev;
31
32         spinlock_t              lock;
33
34         char __iomem            *fb_base;
35         unsigned long           fb_base_phys;
36
37         unsigned long           fb8_buf_diff;
38         unsigned long           regs_base_phys;
39
40         void __iomem            *ramdac;
41
42         struct device_node      *of_node;
43
44         unsigned int            width;
45         unsigned int            height;
46         unsigned int            depth;
47         unsigned int            fb_size;
48
49         u32                     fb_base_reg;
50         u32                     fb8_0_off;
51         u32                     fb8_1_off;
52
53         u32                     pseudo_palette[16];
54 };
55
56 static int __devinit e3d_get_props(struct e3d_info *ep)
57 {
58         ep->width = of_getintprop_default(ep->of_node, "width", 0);
59         ep->height = of_getintprop_default(ep->of_node, "height", 0);
60         ep->depth = of_getintprop_default(ep->of_node, "depth", 8);
61
62         if (!ep->width || !ep->height) {
63                 printk(KERN_ERR "e3d: Critical properties missing for %s\n",
64                        pci_name(ep->pdev));
65                 return -EINVAL;
66         }
67
68         return 0;
69 }
70
71 /* My XVR-500 comes up, at 1280x768 and a FB base register value of
72  * 0x04000000, the following video layout register values:
73  *
74  * RAMDAC_VID_WH        0x03ff04ff
75  * RAMDAC_VID_CFG       0x1a0b0088
76  * RAMDAC_VID_32FB_0    0x04000000
77  * RAMDAC_VID_32FB_1    0x04800000
78  * RAMDAC_VID_8FB_0     0x05000000
79  * RAMDAC_VID_8FB_1     0x05200000
80  * RAMDAC_VID_XXXFB     0x05400000
81  * RAMDAC_VID_YYYFB     0x05c00000
82  * RAMDAC_VID_ZZZFB     0x05e00000
83  */
84 /* Video layout registers */
85 #define RAMDAC_VID_WH           0x00000070UL /* (height-1)<<16 | (width-1) */
86 #define RAMDAC_VID_CFG          0x00000074UL /* 0x1a000088|(linesz_log2<<16) */
87 #define RAMDAC_VID_32FB_0       0x00000078UL /* PCI base 32bpp FB buffer 0 */
88 #define RAMDAC_VID_32FB_1       0x0000007cUL /* PCI base 32bpp FB buffer 1 */
89 #define RAMDAC_VID_8FB_0        0x00000080UL /* PCI base 8bpp FB buffer 0 */
90 #define RAMDAC_VID_8FB_1        0x00000084UL /* PCI base 8bpp FB buffer 1 */
91 #define RAMDAC_VID_XXXFB        0x00000088UL /* PCI base of XXX FB */
92 #define RAMDAC_VID_YYYFB        0x0000008cUL /* PCI base of YYY FB */
93 #define RAMDAC_VID_ZZZFB        0x00000090UL /* PCI base of ZZZ FB */
94
95 /* CLUT registers */
96 #define RAMDAC_INDEX            0x000000bcUL
97 #define RAMDAC_DATA             0x000000c0UL
98
99 static void e3d_clut_write(struct e3d_info *ep, int index, u32 val)
100 {
101         void __iomem *ramdac = ep->ramdac;
102         unsigned long flags;
103
104         spin_lock_irqsave(&ep->lock, flags);
105
106         writel(index, ramdac + RAMDAC_INDEX);
107         writel(val, ramdac + RAMDAC_DATA);
108
109         spin_unlock_irqrestore(&ep->lock, flags);
110 }
111
112 static int e3d_setcolreg(unsigned regno,
113                          unsigned red, unsigned green, unsigned blue,
114                          unsigned transp, struct fb_info *info)
115 {
116         struct e3d_info *ep = info->par;
117         u32 red_8, green_8, blue_8;
118         u32 red_10, green_10, blue_10;
119         u32 value;
120
121         if (regno >= 256)
122                 return 1;
123
124         red_8 = red >> 8;
125         green_8 = green >> 8;
126         blue_8 = blue >> 8;
127
128         value = (blue_8 << 24) | (green_8 << 16) | (red_8 << 8);
129
130         if (info->fix.visual == FB_VISUAL_TRUECOLOR && regno < 16)
131                 ((u32 *)info->pseudo_palette)[regno] = value;
132
133
134         red_10 = red >> 6;
135         green_10 = green >> 6;
136         blue_10 = blue >> 6;
137
138         value = (blue_10 << 20) | (green_10 << 10) | (red_10 << 0);
139         e3d_clut_write(ep, regno, value);
140
141         return 0;
142 }
143
144 /* XXX This is a bit of a hack.  I can't figure out exactly how the
145  * XXX two 8bpp areas of the framebuffer work.  I imagine there is
146  * XXX a WID attribute somewhere else in the framebuffer which tells
147  * XXX the ramdac which of the two 8bpp framebuffer regions to take
148  * XXX the pixel from.  So, for now, render into both regions to make
149  * XXX sure the pixel shows up.
150  */
151 static void e3d_imageblit(struct fb_info *info, const struct fb_image *image)
152 {
153         struct e3d_info *ep = info->par;
154         unsigned long flags;
155
156         spin_lock_irqsave(&ep->lock, flags);
157         cfb_imageblit(info, image);
158         info->screen_base += ep->fb8_buf_diff;
159         cfb_imageblit(info, image);
160         info->screen_base -= ep->fb8_buf_diff;
161         spin_unlock_irqrestore(&ep->lock, flags);
162 }
163
164 static void e3d_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
165 {
166         struct e3d_info *ep = info->par;
167         unsigned long flags;
168
169         spin_lock_irqsave(&ep->lock, flags);
170         cfb_fillrect(info, rect);
171         info->screen_base += ep->fb8_buf_diff;
172         cfb_fillrect(info, rect);
173         info->screen_base -= ep->fb8_buf_diff;
174         spin_unlock_irqrestore(&ep->lock, flags);
175 }
176
177 static void e3d_copyarea(struct fb_info *info, const struct fb_copyarea *area)
178 {
179         struct e3d_info *ep = info->par;
180         unsigned long flags;
181
182         spin_lock_irqsave(&ep->lock, flags);
183         cfb_copyarea(info, area);
184         info->screen_base += ep->fb8_buf_diff;
185         cfb_copyarea(info, area);
186         info->screen_base -= ep->fb8_buf_diff;
187         spin_unlock_irqrestore(&ep->lock, flags);
188 }
189
190 static struct fb_ops e3d_ops = {
191         .owner                  = THIS_MODULE,
192         .fb_setcolreg           = e3d_setcolreg,
193         .fb_fillrect            = e3d_fillrect,
194         .fb_copyarea            = e3d_copyarea,
195         .fb_imageblit           = e3d_imageblit,
196 };
197
198 static int __devinit e3d_set_fbinfo(struct e3d_info *ep)
199 {
200         struct fb_info *info = ep->info;
201         struct fb_var_screeninfo *var = &info->var;
202
203         info->flags = FBINFO_DEFAULT;
204         info->fbops = &e3d_ops;
205         info->screen_base = ep->fb_base;
206         info->screen_size = ep->fb_size;
207
208         info->pseudo_palette = ep->pseudo_palette;
209
210         /* Fill fix common fields */
211         strlcpy(info->fix.id, "e3d", sizeof(info->fix.id));
212         info->fix.smem_start = ep->fb_base_phys;
213         info->fix.smem_len = ep->fb_size;
214         info->fix.type = FB_TYPE_PACKED_PIXELS;
215         if (ep->depth == 32 || ep->depth == 24)
216                 info->fix.visual = FB_VISUAL_TRUECOLOR;
217         else
218                 info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
219
220         var->xres = ep->width;
221         var->yres = ep->height;
222         var->xres_virtual = var->xres;
223         var->yres_virtual = var->yres;
224         var->bits_per_pixel = ep->depth;
225
226         var->red.offset = 8;
227         var->red.length = 8;
228         var->green.offset = 16;
229         var->green.length = 8;
230         var->blue.offset = 24;
231         var->blue.length = 8;
232         var->transp.offset = 0;
233         var->transp.length = 0;
234
235         if (fb_alloc_cmap(&info->cmap, 256, 0)) {
236                 printk(KERN_ERR "e3d: Cannot allocate color map.\n");
237                 return -ENOMEM;
238         }
239
240         return 0;
241 }
242
243 static int __devinit e3d_pci_register(struct pci_dev *pdev,
244                                       const struct pci_device_id *ent)
245 {
246         struct fb_info *info;
247         struct e3d_info *ep;
248         unsigned int line_length;
249         int err;
250
251         err = pci_enable_device(pdev);
252         if (err < 0) {
253                 printk(KERN_ERR "e3d: Cannot enable PCI device %s\n",
254                        pci_name(pdev));
255                 goto err_out;
256         }
257
258         info = framebuffer_alloc(sizeof(struct e3d_info), &pdev->dev);
259         if (!info) {
260                 printk(KERN_ERR "e3d: Cannot allocate fb_info\n");
261                 err = -ENOMEM;
262                 goto err_disable;
263         }
264
265         ep = info->par;
266         ep->info = info;
267         ep->pdev = pdev;
268         spin_lock_init(&ep->lock);
269         ep->of_node = pci_device_to_OF_node(pdev);
270         if (!ep->of_node) {
271                 printk(KERN_ERR "e3d: Cannot find OF node of %s\n",
272                        pci_name(pdev));
273                 err = -ENODEV;
274                 goto err_release_fb;
275         }
276
277         /* Read the PCI base register of the frame buffer, which we
278          * need in order to interpret the RAMDAC_VID_*FB* values in
279          * the ramdac correctly.
280          */
281         pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0,
282                               &ep->fb_base_reg);
283         ep->fb_base_reg &= PCI_BASE_ADDRESS_MEM_MASK;
284
285         ep->regs_base_phys = pci_resource_start (pdev, 1);
286         err = pci_request_region(pdev, 1, "e3d regs");
287         if (err < 0) {
288                 printk("e3d: Cannot request region 1 for %s\n",
289                        pci_name(pdev));
290                 goto err_release_fb;
291         }
292         ep->ramdac = ioremap(ep->regs_base_phys + 0x8000, 0x1000);
293         if (!ep->ramdac)
294                 goto err_release_pci1;
295
296         ep->fb8_0_off = readl(ep->ramdac + RAMDAC_VID_8FB_0);
297         ep->fb8_0_off -= ep->fb_base_reg;
298
299         ep->fb8_1_off = readl(ep->ramdac + RAMDAC_VID_8FB_1);
300         ep->fb8_1_off -= ep->fb_base_reg;
301
302         ep->fb8_buf_diff = ep->fb8_1_off - ep->fb8_0_off;
303
304         ep->fb_base_phys = pci_resource_start (pdev, 0);
305         ep->fb_base_phys += ep->fb8_0_off;
306
307         err = pci_request_region(pdev, 0, "e3d framebuffer");
308         if (err < 0) {
309                 printk("e3d: Cannot request region 0 for %s\n",
310                        pci_name(pdev));
311                 goto err_unmap_ramdac;
312         }
313
314         err = e3d_get_props(ep);
315         if (err)
316                 goto err_release_pci0;
317
318         line_length = (readl(ep->ramdac + RAMDAC_VID_CFG) >> 16) & 0xff;
319         line_length = 1 << line_length;
320
321         switch (ep->depth) {
322         case 8:
323                 info->fix.line_length = line_length;
324                 break;
325         case 16:
326                 info->fix.line_length = line_length * 2;
327                 break;
328         case 24:
329                 info->fix.line_length = line_length * 3;
330                 break;
331         case 32:
332                 info->fix.line_length = line_length * 4;
333                 break;
334         }
335         ep->fb_size = info->fix.line_length * ep->height;
336
337         ep->fb_base = ioremap(ep->fb_base_phys, ep->fb_size);
338         if (!ep->fb_base)
339                 goto err_release_pci0;
340
341         err = e3d_set_fbinfo(ep);
342         if (err)
343                 goto err_unmap_fb;
344
345         pci_set_drvdata(pdev, info);
346
347         printk("e3d: Found device at %s\n", pci_name(pdev));
348
349         err = register_framebuffer(info);
350         if (err < 0) {
351                 printk(KERN_ERR "e3d: Could not register framebuffer %s\n",
352                        pci_name(pdev));
353                 goto err_unmap_fb;
354         }
355
356         return 0;
357
358 err_unmap_fb:
359         iounmap(ep->fb_base);
360
361 err_release_pci0:
362         pci_release_region(pdev, 0);
363
364 err_unmap_ramdac:
365         iounmap(ep->ramdac);
366
367 err_release_pci1:
368         pci_release_region(pdev, 1);
369
370 err_release_fb:
371         framebuffer_release(info);
372
373 err_disable:
374         pci_disable_device(pdev);
375
376 err_out:
377         return err;
378 }
379
380 static void __devexit e3d_pci_unregister(struct pci_dev *pdev)
381 {
382         struct fb_info *info = pci_get_drvdata(pdev);
383         struct e3d_info *ep = info->par;
384
385         unregister_framebuffer(info);
386
387         iounmap(ep->ramdac);
388         iounmap(ep->fb_base);
389
390         pci_release_region(pdev, 0);
391         pci_release_region(pdev, 1);
392
393         framebuffer_release(info);
394
395         pci_disable_device(pdev);
396 }
397
398 static struct pci_device_id e3d_pci_table[] = {
399         {       PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x7a0),        },
400         {       PCI_DEVICE(PCI_VENDOR_ID_3DLABS, 0x7a2),        },
401         {       .vendor = PCI_VENDOR_ID_3DLABS,
402                 .device = PCI_ANY_ID,
403                 .subvendor = PCI_VENDOR_ID_3DLABS,
404                 .subdevice = 0x0108,
405         },
406         {       .vendor = PCI_VENDOR_ID_3DLABS,
407                 .device = PCI_ANY_ID,
408                 .subvendor = PCI_VENDOR_ID_3DLABS,
409                 .subdevice = 0x0140,
410         },
411         {       .vendor = PCI_VENDOR_ID_3DLABS,
412                 .device = PCI_ANY_ID,
413                 .subvendor = PCI_VENDOR_ID_3DLABS,
414                 .subdevice = 0x1024,
415         },
416         { 0, }
417 };
418
419 static struct pci_driver e3d_driver = {
420         .name           = "e3d",
421         .id_table       = e3d_pci_table,
422         .probe          = e3d_pci_register,
423         .remove         = __devexit_p(e3d_pci_unregister),
424 };
425
426 static int __init e3d_init(void)
427 {
428         if (fb_get_options("e3d", NULL))
429                 return -ENODEV;
430
431         return pci_register_driver(&e3d_driver);
432 }
433
434 static void __exit e3d_exit(void)
435 {
436         pci_unregister_driver(&e3d_driver);
437 }
438
439 module_init(e3d_init);
440 module_exit(e3d_exit);
441
442 MODULE_DESCRIPTION("framebuffer driver for Sun XVR-500 graphics");
443 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
444 MODULE_VERSION("1.0");
445 MODULE_LICENSE("GPL");