[PATCH] Sparse: Cleanup sgiseeq sparse warnings.
[linux-2.6] / drivers / video / bw2.c
1 /* bw2.c: BWTWO frame buffer driver
2  *
3  * Copyright (C) 2003 David S. Miller (davem@redhat.com)
4  * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
5  * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
6  * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
7  *
8  * Driver layout based loosely on tgafb.c, see that file for credits.
9  */
10
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/slab.h>
16 #include <linux/delay.h>
17 #include <linux/init.h>
18 #include <linux/fb.h>
19 #include <linux/mm.h>
20
21 #include <asm/io.h>
22 #include <asm/sbus.h>
23 #include <asm/oplib.h>
24 #include <asm/fbio.h>
25
26 #ifdef CONFIG_SPARC32
27 #include <asm/sun4paddr.h>
28 #endif
29
30 #include "sbuslib.h"
31
32 /*
33  * Local functions.
34  */
35
36 static int bw2_blank(int, struct fb_info *);
37
38 static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
39 static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
40
41 /*
42  *  Frame buffer operations
43  */
44
45 static struct fb_ops bw2_ops = {
46         .owner                  = THIS_MODULE,
47         .fb_blank               = bw2_blank,
48         .fb_fillrect            = cfb_fillrect,
49         .fb_copyarea            = cfb_copyarea,
50         .fb_imageblit           = cfb_imageblit,
51         .fb_mmap                = bw2_mmap,
52         .fb_ioctl               = bw2_ioctl,
53 #ifdef CONFIG_COMPAT
54         .fb_compat_ioctl        = sbusfb_compat_ioctl,
55 #endif
56 };
57
58 /* OBio addresses for the bwtwo registers */
59 #define BWTWO_REGISTER_OFFSET 0x400000
60
61 struct bt_regs {
62         volatile u32 addr;
63         volatile u32 color_map;
64         volatile u32 control;
65         volatile u32 cursor;
66 };
67
68 struct bw2_regs {
69         struct bt_regs  cmap;
70         volatile u8     control;
71         volatile u8     status;
72         volatile u8     cursor_start;
73         volatile u8     cursor_end;
74         volatile u8     h_blank_start;
75         volatile u8     h_blank_end;
76         volatile u8     h_sync_start;
77         volatile u8     h_sync_end;
78         volatile u8     comp_sync_end;
79         volatile u8     v_blank_start_high;
80         volatile u8     v_blank_start_low;
81         volatile u8     v_blank_end;
82         volatile u8     v_sync_start;
83         volatile u8     v_sync_end;
84         volatile u8     xfer_holdoff_start;
85         volatile u8     xfer_holdoff_end;
86 };
87
88 /* Status Register Constants */
89 #define BWTWO_SR_RES_MASK       0x70
90 #define BWTWO_SR_1600_1280      0x50
91 #define BWTWO_SR_1152_900_76_A  0x40
92 #define BWTWO_SR_1152_900_76_B  0x60
93 #define BWTWO_SR_ID_MASK        0x0f
94 #define BWTWO_SR_ID_MONO        0x02
95 #define BWTWO_SR_ID_MONO_ECL    0x03
96 #define BWTWO_SR_ID_MSYNC       0x04
97 #define BWTWO_SR_ID_NOCONN      0x0a
98
99 /* Control Register Constants */
100 #define BWTWO_CTL_ENABLE_INTS   0x80
101 #define BWTWO_CTL_ENABLE_VIDEO  0x40
102 #define BWTWO_CTL_ENABLE_TIMING 0x20
103 #define BWTWO_CTL_ENABLE_CURCMP 0x10
104 #define BWTWO_CTL_XTAL_MASK     0x0C
105 #define BWTWO_CTL_DIVISOR_MASK  0x03
106
107 /* Status Register Constants */
108 #define BWTWO_STAT_PENDING_INT  0x80
109 #define BWTWO_STAT_MSENSE_MASK  0x70
110 #define BWTWO_STAT_ID_MASK      0x0f
111
112 struct bw2_par {
113         spinlock_t              lock;
114         struct bw2_regs         __iomem *regs;
115
116         u32                     flags;
117 #define BW2_FLAG_BLANKED        0x00000001
118
119         unsigned long           physbase;
120         unsigned long           fbsize;
121
122         struct sbus_dev         *sdev;
123 };
124
125 /**
126  *      bw2_blank - Optional function.  Blanks the display.
127  *      @blank_mode: the blank mode we want.
128  *      @info: frame buffer structure that represents a single frame buffer
129  */
130 static int
131 bw2_blank(int blank, struct fb_info *info)
132 {
133         struct bw2_par *par = (struct bw2_par *) info->par;
134         struct bw2_regs __iomem *regs = par->regs;
135         unsigned long flags;
136         u8 val;
137
138         spin_lock_irqsave(&par->lock, flags);
139
140         switch (blank) {
141         case FB_BLANK_UNBLANK: /* Unblanking */
142                 val = sbus_readb(&regs->control);
143                 val |= BWTWO_CTL_ENABLE_VIDEO;
144                 sbus_writeb(val, &regs->control);
145                 par->flags &= ~BW2_FLAG_BLANKED;
146                 break;
147
148         case FB_BLANK_NORMAL: /* Normal blanking */
149         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
150         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
151         case FB_BLANK_POWERDOWN: /* Poweroff */
152                 val = sbus_readb(&regs->control);
153                 val &= ~BWTWO_CTL_ENABLE_VIDEO;
154                 sbus_writeb(val, &regs->control);
155                 par->flags |= BW2_FLAG_BLANKED;
156                 break;
157         }
158
159         spin_unlock_irqrestore(&par->lock, flags);
160
161         return 0;
162 }
163
164 static struct sbus_mmap_map bw2_mmap_map[] = {
165         {
166                 .size = SBUS_MMAP_FBSIZE(1)
167         },
168         { .size = 0 }
169 };
170
171 static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
172 {
173         struct bw2_par *par = (struct bw2_par *)info->par;
174
175         return sbusfb_mmap_helper(bw2_mmap_map,
176                                   par->physbase, par->fbsize,
177                                   (par->sdev ?
178                                    par->sdev->reg_addrs[0].which_io :
179                                    0),
180                                   vma);
181 }
182
183 static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
184 {
185         struct bw2_par *par = (struct bw2_par *) info->par;
186
187         return sbusfb_ioctl_helper(cmd, arg, info,
188                                    FBTYPE_SUN2BW, 1, par->fbsize);
189 }
190
191 /*
192  *  Initialisation
193  */
194
195 static void
196 bw2_init_fix(struct fb_info *info, int linebytes)
197 {
198         strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
199
200         info->fix.type = FB_TYPE_PACKED_PIXELS;
201         info->fix.visual = FB_VISUAL_MONO01;
202
203         info->fix.line_length = linebytes;
204
205         info->fix.accel = FB_ACCEL_SUN_BWTWO;
206 }
207
208 static u8 bw2regs_1600[] __initdata = {
209         0x14, 0x8b,     0x15, 0x28,     0x16, 0x03,     0x17, 0x13,
210         0x18, 0x7b,     0x19, 0x05,     0x1a, 0x34,     0x1b, 0x2e,
211         0x1c, 0x00,     0x1d, 0x0a,     0x1e, 0xff,     0x1f, 0x01,
212         0x10, 0x21,     0
213 };
214
215 static u8 bw2regs_ecl[] __initdata = {
216         0x14, 0x65,     0x15, 0x1e,     0x16, 0x04,     0x17, 0x0c,
217         0x18, 0x5e,     0x19, 0x03,     0x1a, 0xa7,     0x1b, 0x23,
218         0x1c, 0x00,     0x1d, 0x08,     0x1e, 0xff,     0x1f, 0x01,
219         0x10, 0x20,     0
220 };
221
222 static u8 bw2regs_analog[] __initdata = {
223         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x03,     0x17, 0x13,
224         0x18, 0xb0,     0x19, 0x03,     0x1a, 0xa6,     0x1b, 0x22,
225         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
226         0x10, 0x20,     0
227 };
228
229 static u8 bw2regs_76hz[] __initdata = {
230         0x14, 0xb7,     0x15, 0x27,     0x16, 0x03,     0x17, 0x0f,
231         0x18, 0xae,     0x19, 0x03,     0x1a, 0xae,     0x1b, 0x2a,
232         0x1c, 0x01,     0x1d, 0x09,     0x1e, 0xff,     0x1f, 0x01,
233         0x10, 0x24,     0
234 };
235
236 static u8 bw2regs_66hz[] __initdata = {
237         0x14, 0xbb,     0x15, 0x2b,     0x16, 0x04,     0x17, 0x14,
238         0x18, 0xae,     0x19, 0x03,     0x1a, 0xa8,     0x1b, 0x24,
239         0x1c, 0x01,     0x1d, 0x05,     0x1e, 0xff,     0x1f, 0x01,
240         0x10, 0x20,     0
241 };
242
243 static void bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
244                                 int *linebytes)
245 {
246         u8 status, mon;
247         u8 *p;
248
249         status = sbus_readb(&par->regs->status);
250         mon = status & BWTWO_SR_RES_MASK;
251         switch (status & BWTWO_SR_ID_MASK) {
252         case BWTWO_SR_ID_MONO_ECL:
253                 if (mon == BWTWO_SR_1600_1280) {
254                         p = bw2regs_1600;
255                         info->var.xres = info->var.xres_virtual = 1600;
256                         info->var.yres = info->var.yres_virtual = 1280;
257                         *linebytes = 1600 / 8;
258                 } else
259                         p = bw2regs_ecl;
260                 break;
261
262         case BWTWO_SR_ID_MONO:
263                 p = bw2regs_analog;
264                 break;
265
266         case BWTWO_SR_ID_MSYNC:
267                 if (mon == BWTWO_SR_1152_900_76_A ||
268                     mon == BWTWO_SR_1152_900_76_B)
269                         p = bw2regs_76hz;
270                 else
271                         p = bw2regs_66hz;
272                 break;
273
274         case BWTWO_SR_ID_NOCONN:
275                 return;
276
277         default:
278                 prom_printf("bw2: can't handle SR %02x\n",
279                             status);
280                 prom_halt();
281         }
282         for ( ; *p; p += 2) {
283                 u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
284                 sbus_writeb(p[1], regp);
285         }
286 }
287
288 struct all_info {
289         struct fb_info info;
290         struct bw2_par par;
291         struct list_head list;
292 };
293 static LIST_HEAD(bw2_list);
294
295 static void bw2_init_one(struct sbus_dev *sdev)
296 {
297         struct all_info *all;
298         struct resource *resp;
299 #ifdef CONFIG_SUN4
300         struct resource res;
301 #endif
302         int linebytes;
303
304         all = kmalloc(sizeof(*all), GFP_KERNEL);
305         if (!all) {
306                 printk(KERN_ERR "bw2: Cannot allocate memory.\n");
307                 return;
308         }
309         memset(all, 0, sizeof(*all));
310
311         INIT_LIST_HEAD(&all->list);
312
313         spin_lock_init(&all->par.lock);
314         all->par.sdev = sdev;
315
316 #ifdef CONFIG_SUN4
317         if (!sdev) {
318                 all->par.physbase = sun4_bwtwo_physaddr;
319                 res.start = sun4_bwtwo_physaddr;
320                 res.end = res.start + BWTWO_REGISTER_OFFSET + sizeof(struct bw2_regs) - 1;
321                 res.flags = IORESOURCE_IO;
322                 resp = &res;
323                 all->info.var.xres = all->info.var.xres_virtual = 1152;
324                 all->info.var.yres = all->info.var.yres_virtual = 900;
325                 all->info.var.bits_per_pixel = 1;
326                 linebytes = 1152 / 8;
327         } else
328 #else
329         {
330                 if (!sdev)
331                         BUG();
332                 all->par.physbase = sdev->reg_addrs[0].phys_addr;
333                 resp = &sdev->resource[0];
334                 sbusfb_fill_var(&all->info.var, (sdev ? sdev->prom_node : 0), 1);
335                 linebytes = prom_getintdefault(sdev->prom_node, "linebytes",
336                                                all->info.var.xres);
337         }
338 #endif
339         all->info.var.red.length = all->info.var.green.length =
340                 all->info.var.blue.length = all->info.var.bits_per_pixel;
341         all->info.var.red.offset = all->info.var.green.offset =
342                 all->info.var.blue.offset = 0;
343
344         all->par.regs = sbus_ioremap(resp, BWTWO_REGISTER_OFFSET,
345                              sizeof(struct bw2_regs), "bw2 regs");
346
347         if (sdev && !prom_getbool(sdev->prom_node, "width"))
348                 bw2_do_default_mode(&all->par, &all->info, &linebytes);
349
350         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
351
352         all->info.flags = FBINFO_DEFAULT;
353         all->info.fbops = &bw2_ops;
354 #if defined(CONFIG_SPARC32)
355         if (sdev)
356                 all->info.screen_base = (char __iomem *)
357                         prom_getintdefault(sdev->prom_node, "address", 0);
358 #endif
359         if (!all->info.screen_base)
360                 all->info.screen_base =
361                         sbus_ioremap(resp, 0, all->par.fbsize, "bw2 ram");
362         all->info.par = &all->par;
363
364         bw2_blank(0, &all->info);
365
366         bw2_init_fix(&all->info, linebytes);
367
368         if (register_framebuffer(&all->info) < 0) {
369                 printk(KERN_ERR "bw2: Could not register framebuffer.\n");
370                 kfree(all);
371                 return;
372         }
373
374         list_add(&all->list, &bw2_list);
375
376         printk("bw2: bwtwo at %lx:%lx\n",
377                (long) (sdev ? sdev->reg_addrs[0].which_io : 0),
378                (long) all->par.physbase);
379 }
380
381 int __init bw2_init(void)
382 {
383         struct sbus_bus *sbus;
384         struct sbus_dev *sdev;
385
386         if (fb_get_options("bw2fb", NULL))
387                 return -ENODEV;
388
389 #ifdef CONFIG_SUN4
390         bw2_init_one(NULL);
391 #endif
392         for_all_sbusdev(sdev, sbus) {
393                 if (!strcmp(sdev->prom_name, "bwtwo"))
394                         bw2_init_one(sdev);
395         }
396
397         return 0;
398 }
399
400 void __exit bw2_exit(void)
401 {
402         struct list_head *pos, *tmp;
403
404         list_for_each_safe(pos, tmp, &bw2_list) {
405                 struct all_info *all = list_entry(pos, typeof(*all), list);
406
407                 unregister_framebuffer(&all->info);
408                 kfree(all);
409         }
410 }
411
412 int __init
413 bw2_setup(char *arg)
414 {
415         /* No cmdline options yet... */
416         return 0;
417 }
418
419 module_init(bw2_init);
420
421 #ifdef MODULE
422 module_exit(bw2_exit);
423 #endif
424
425 MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
426 MODULE_AUTHOR("David S. Miller <davem@redhat.com>");
427 MODULE_LICENSE("GPL");