[PATCH] tokenring: fix module_init error handling
[linux-2.6] / drivers / video / p9100.c
1 /* p9100.c: P9100 frame buffer driver
2  *
3  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
4  * Copyright 1999 Derrick J Brashear (shadow@dementia.org)
5  *
6  * Driver layout based loosely on tgafb.c, see that file for credits.
7  */
8
9 #include <linux/module.h>
10 #include <linux/kernel.h>
11 #include <linux/errno.h>
12 #include <linux/string.h>
13 #include <linux/slab.h>
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/fb.h>
17 #include <linux/mm.h>
18
19 #include <asm/io.h>
20 #include <asm/prom.h>
21 #include <asm/of_device.h>
22 #include <asm/fbio.h>
23
24 #include "sbuslib.h"
25
26 /*
27  * Local functions.
28  */
29
30 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
31                            unsigned, struct fb_info *);
32 static int p9100_blank(int, struct fb_info *);
33
34 static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
35 static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
36
37 /*
38  *  Frame buffer operations
39  */
40
41 static struct fb_ops p9100_ops = {
42         .owner                  = THIS_MODULE,
43         .fb_setcolreg           = p9100_setcolreg,
44         .fb_blank               = p9100_blank,
45         .fb_fillrect            = cfb_fillrect,
46         .fb_copyarea            = cfb_copyarea,
47         .fb_imageblit           = cfb_imageblit,
48         .fb_mmap                = p9100_mmap,
49         .fb_ioctl               = p9100_ioctl,
50 #ifdef CONFIG_COMPAT
51         .fb_compat_ioctl        = sbusfb_compat_ioctl,
52 #endif
53 };
54
55 /* P9100 control registers */
56 #define P9100_SYSCTL_OFF        0x0UL
57 #define P9100_VIDEOCTL_OFF      0x100UL
58 #define P9100_VRAMCTL_OFF       0x180UL
59 #define P9100_RAMDAC_OFF        0x200UL
60 #define P9100_VIDEOCOPROC_OFF   0x400UL
61
62 /* P9100 command registers */
63 #define P9100_CMD_OFF 0x0UL
64
65 /* P9100 framebuffer memory */
66 #define P9100_FB_OFF 0x0UL
67
68 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
69 #define SYS_CONFIG_PIXELSIZE_SHIFT 26 
70
71 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
72
73 struct p9100_regs {
74         /* Registers for the system control */
75         u32 sys_base;
76         u32 sys_config;
77         u32 sys_intr;
78         u32 sys_int_ena;
79         u32 sys_alt_rd;
80         u32 sys_alt_wr;
81         u32 sys_xxx[58];
82
83         /* Registers for the video control */
84         u32 vid_base;
85         u32 vid_hcnt;
86         u32 vid_htotal;
87         u32 vid_hsync_rise;
88         u32 vid_hblank_rise;
89         u32 vid_hblank_fall;
90         u32 vid_hcnt_preload;
91         u32 vid_vcnt;
92         u32 vid_vlen;
93         u32 vid_vsync_rise;
94         u32 vid_vblank_rise;
95         u32 vid_vblank_fall;
96         u32 vid_vcnt_preload;
97         u32 vid_screenpaint_addr;
98         u32 vid_screenpaint_timectl1;
99         u32 vid_screenpaint_qsfcnt;
100         u32 vid_screenpaint_timectl2;
101         u32 vid_xxx[15];
102
103         /* Registers for the video control */
104         u32 vram_base;
105         u32 vram_memcfg;
106         u32 vram_refresh_pd;
107         u32 vram_refresh_cnt;
108         u32 vram_raslo_max;
109         u32 vram_raslo_cur;
110         u32 pwrup_cfg;
111         u32 vram_xxx[25];
112
113         /* Registers for IBM RGB528 Palette */
114         u32 ramdac_cmap_wridx; 
115         u32 ramdac_palette_data;
116         u32 ramdac_pixel_mask;
117         u32 ramdac_palette_rdaddr;
118         u32 ramdac_idx_lo;
119         u32 ramdac_idx_hi;
120         u32 ramdac_idx_data;
121         u32 ramdac_idx_ctl;
122         u32 ramdac_xxx[1784];
123 };
124
125 struct p9100_cmd_parameng {
126         u32 parameng_status;
127         u32 parameng_bltcmd;
128         u32 parameng_quadcmd;
129 };
130
131 struct p9100_par {
132         spinlock_t              lock;
133         struct p9100_regs       __iomem *regs;
134
135         u32                     flags;
136 #define P9100_FLAG_BLANKED      0x00000001
137
138         unsigned long           physbase;
139         unsigned long           which_io;
140         unsigned long           fbsize;
141 };
142
143 /**
144  *      p9100_setcolreg - Optional function. Sets a color register.
145  *      @regno: boolean, 0 copy local, 1 get_user() function
146  *      @red: frame buffer colormap structure
147  *      @green: The green value which can be up to 16 bits wide
148  *      @blue:  The blue value which can be up to 16 bits wide.
149  *      @transp: If supported the alpha value which can be up to 16 bits wide.
150  *      @info: frame buffer info structure
151  */
152 static int p9100_setcolreg(unsigned regno,
153                            unsigned red, unsigned green, unsigned blue,
154                            unsigned transp, struct fb_info *info)
155 {
156         struct p9100_par *par = (struct p9100_par *) info->par;
157         struct p9100_regs __iomem *regs = par->regs;
158         unsigned long flags;
159
160         if (regno >= 256)
161                 return 1;
162
163         red >>= 8;
164         green >>= 8;
165         blue >>= 8;
166
167         spin_lock_irqsave(&par->lock, flags);
168
169         sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
170         sbus_writel((red << 16), &regs->ramdac_palette_data);
171         sbus_writel((green << 16), &regs->ramdac_palette_data);
172         sbus_writel((blue << 16), &regs->ramdac_palette_data);
173
174         spin_unlock_irqrestore(&par->lock, flags);
175
176         return 0;
177 }
178
179 /**
180  *      p9100_blank - Optional function.  Blanks the display.
181  *      @blank_mode: the blank mode we want.
182  *      @info: frame buffer structure that represents a single frame buffer
183  */
184 static int
185 p9100_blank(int blank, struct fb_info *info)
186 {
187         struct p9100_par *par = (struct p9100_par *) info->par;
188         struct p9100_regs __iomem *regs = par->regs;
189         unsigned long flags;
190         u32 val;
191
192         spin_lock_irqsave(&par->lock, flags);
193
194         switch (blank) {
195         case FB_BLANK_UNBLANK: /* Unblanking */
196                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
197                 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
198                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
199                 par->flags &= ~P9100_FLAG_BLANKED;
200                 break;
201
202         case FB_BLANK_NORMAL: /* Normal blanking */
203         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
204         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
205         case FB_BLANK_POWERDOWN: /* Poweroff */
206                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
207                 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
208                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
209                 par->flags |= P9100_FLAG_BLANKED;
210                 break;
211         }
212
213         spin_unlock_irqrestore(&par->lock, flags);
214
215         return 0;
216 }
217
218 static struct sbus_mmap_map p9100_mmap_map[] = {
219         { CG3_MMAP_OFFSET,      0,              SBUS_MMAP_FBSIZE(1) },
220         { 0,                    0,              0                   }
221 };
222
223 static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
224 {
225         struct p9100_par *par = (struct p9100_par *)info->par;
226
227         return sbusfb_mmap_helper(p9100_mmap_map,
228                                   par->physbase, par->fbsize,
229                                   par->which_io, vma);
230 }
231
232 static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
233                        unsigned long arg)
234 {
235         struct p9100_par *par = (struct p9100_par *) info->par;
236
237         /* Make it look like a cg3. */
238         return sbusfb_ioctl_helper(cmd, arg, info,
239                                    FBTYPE_SUN3COLOR, 8, par->fbsize);
240 }
241
242 /*
243  *  Initialisation
244  */
245
246 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
247 {
248         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
249
250         info->fix.type = FB_TYPE_PACKED_PIXELS;
251         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
252
253         info->fix.line_length = linebytes;
254
255         info->fix.accel = FB_ACCEL_SUN_CGTHREE;
256 }
257
258 struct all_info {
259         struct fb_info info;
260         struct p9100_par par;
261 };
262
263 static int __devinit p9100_init_one(struct of_device *op)
264 {
265         struct device_node *dp = op->node;
266         struct all_info *all;
267         int linebytes, err;
268
269         all = kzalloc(sizeof(*all), GFP_KERNEL);
270         if (!all)
271                 return -ENOMEM;
272
273         spin_lock_init(&all->par.lock);
274
275         /* This is the framebuffer and the only resource apps can mmap.  */
276         all->par.physbase = op->resource[2].start;
277         all->par.which_io = op->resource[2].flags & IORESOURCE_BITS;
278
279         sbusfb_fill_var(&all->info.var, dp->node, 8);
280         all->info.var.red.length = 8;
281         all->info.var.green.length = 8;
282         all->info.var.blue.length = 8;
283
284         linebytes = of_getintprop_default(dp, "linebytes",
285                                           all->info.var.xres);
286         all->par.fbsize = PAGE_ALIGN(linebytes * all->info.var.yres);
287
288         all->par.regs = of_ioremap(&op->resource[0], 0,
289                                    sizeof(struct p9100_regs), "p9100 regs");
290         if (!all->par.regs) {
291                 kfree(all);
292                 return -ENOMEM;
293         }
294
295         all->info.flags = FBINFO_DEFAULT;
296         all->info.fbops = &p9100_ops;
297         all->info.screen_base = of_ioremap(&op->resource[2], 0,
298                                            all->par.fbsize, "p9100 ram");
299         if (!all->info.screen_base) {
300                 of_iounmap(all->par.regs, sizeof(struct p9100_regs));
301                 kfree(all);
302                 return -ENOMEM;
303         }
304         all->info.par = &all->par;
305
306         p9100_blank(0, &all->info);
307
308         if (fb_alloc_cmap(&all->info.cmap, 256, 0)) {
309                 of_iounmap(all->par.regs, sizeof(struct p9100_regs));
310                 of_iounmap(all->info.screen_base, all->par.fbsize);
311                 kfree(all);
312                 return -ENOMEM;
313         }
314
315         p9100_init_fix(&all->info, linebytes, dp);
316
317         err = register_framebuffer(&all->info);
318         if (err < 0) {
319                 fb_dealloc_cmap(&all->info.cmap);
320                 of_iounmap(all->par.regs, sizeof(struct p9100_regs));
321                 of_iounmap(all->info.screen_base, all->par.fbsize);
322                 kfree(all);
323                 return err;
324         }
325         fb_set_cmap(&all->info.cmap, &all->info);
326
327         dev_set_drvdata(&op->dev, all);
328
329         printk("%s: p9100 at %lx:%lx\n",
330                dp->full_name,
331                all->par.which_io, all->par.physbase);
332
333         return 0;
334 }
335
336 static int __devinit p9100_probe(struct of_device *dev, const struct of_device_id *match)
337 {
338         struct of_device *op = to_of_device(&dev->dev);
339
340         return p9100_init_one(op);
341 }
342
343 static int __devexit p9100_remove(struct of_device *dev)
344 {
345         struct all_info *all = dev_get_drvdata(&dev->dev);
346
347         unregister_framebuffer(&all->info);
348         fb_dealloc_cmap(&all->info.cmap);
349
350         of_iounmap(all->par.regs, sizeof(struct p9100_regs));
351         of_iounmap(all->info.screen_base, all->par.fbsize);
352
353         kfree(all);
354
355         dev_set_drvdata(&dev->dev, NULL);
356
357         return 0;
358 }
359
360 static struct of_device_id p9100_match[] = {
361         {
362                 .name = "p9100",
363         },
364         {},
365 };
366 MODULE_DEVICE_TABLE(of, p9100_match);
367
368 static struct of_platform_driver p9100_driver = {
369         .name           = "p9100",
370         .match_table    = p9100_match,
371         .probe          = p9100_probe,
372         .remove         = __devexit_p(p9100_remove),
373 };
374
375 static int __init p9100_init(void)
376 {
377         if (fb_get_options("p9100fb", NULL))
378                 return -ENODEV;
379
380         return of_register_driver(&p9100_driver, &of_bus_type);
381 }
382
383 static void __exit p9100_exit(void)
384 {
385         of_unregister_driver(&p9100_driver);
386 }
387
388 module_init(p9100_init);
389 module_exit(p9100_exit);
390
391 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
392 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
393 MODULE_VERSION("2.0");
394 MODULE_LICENSE("GPL");