i2c: tegra: Add stub runtime power management
[linux-2.6.git] / 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/delay.h>
14 #include <linux/init.h>
15 #include <linux/fb.h>
16 #include <linux/mm.h>
17 #include <linux/of_device.h>
18
19 #include <asm/io.h>
20 #include <asm/fbio.h>
21
22 #include "sbuslib.h"
23
24 /*
25  * Local functions.
26  */
27
28 static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
29                            unsigned, struct fb_info *);
30 static int p9100_blank(int, struct fb_info *);
31
32 static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
33 static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
34
35 /*
36  *  Frame buffer operations
37  */
38
39 static struct fb_ops p9100_ops = {
40         .owner                  = THIS_MODULE,
41         .fb_setcolreg           = p9100_setcolreg,
42         .fb_blank               = p9100_blank,
43         .fb_fillrect            = cfb_fillrect,
44         .fb_copyarea            = cfb_copyarea,
45         .fb_imageblit           = cfb_imageblit,
46         .fb_mmap                = p9100_mmap,
47         .fb_ioctl               = p9100_ioctl,
48 #ifdef CONFIG_COMPAT
49         .fb_compat_ioctl        = sbusfb_compat_ioctl,
50 #endif
51 };
52
53 /* P9100 control registers */
54 #define P9100_SYSCTL_OFF        0x0UL
55 #define P9100_VIDEOCTL_OFF      0x100UL
56 #define P9100_VRAMCTL_OFF       0x180UL
57 #define P9100_RAMDAC_OFF        0x200UL
58 #define P9100_VIDEOCOPROC_OFF   0x400UL
59
60 /* P9100 command registers */
61 #define P9100_CMD_OFF 0x0UL
62
63 /* P9100 framebuffer memory */
64 #define P9100_FB_OFF 0x0UL
65
66 /* 3 bits: 2=8bpp 3=16bpp 5=32bpp 7=24bpp */
67 #define SYS_CONFIG_PIXELSIZE_SHIFT 26 
68
69 #define SCREENPAINT_TIMECTL1_ENABLE_VIDEO 0x20 /* 0 = off, 1 = on */
70
71 struct p9100_regs {
72         /* Registers for the system control */
73         u32 sys_base;
74         u32 sys_config;
75         u32 sys_intr;
76         u32 sys_int_ena;
77         u32 sys_alt_rd;
78         u32 sys_alt_wr;
79         u32 sys_xxx[58];
80
81         /* Registers for the video control */
82         u32 vid_base;
83         u32 vid_hcnt;
84         u32 vid_htotal;
85         u32 vid_hsync_rise;
86         u32 vid_hblank_rise;
87         u32 vid_hblank_fall;
88         u32 vid_hcnt_preload;
89         u32 vid_vcnt;
90         u32 vid_vlen;
91         u32 vid_vsync_rise;
92         u32 vid_vblank_rise;
93         u32 vid_vblank_fall;
94         u32 vid_vcnt_preload;
95         u32 vid_screenpaint_addr;
96         u32 vid_screenpaint_timectl1;
97         u32 vid_screenpaint_qsfcnt;
98         u32 vid_screenpaint_timectl2;
99         u32 vid_xxx[15];
100
101         /* Registers for the video control */
102         u32 vram_base;
103         u32 vram_memcfg;
104         u32 vram_refresh_pd;
105         u32 vram_refresh_cnt;
106         u32 vram_raslo_max;
107         u32 vram_raslo_cur;
108         u32 pwrup_cfg;
109         u32 vram_xxx[25];
110
111         /* Registers for IBM RGB528 Palette */
112         u32 ramdac_cmap_wridx; 
113         u32 ramdac_palette_data;
114         u32 ramdac_pixel_mask;
115         u32 ramdac_palette_rdaddr;
116         u32 ramdac_idx_lo;
117         u32 ramdac_idx_hi;
118         u32 ramdac_idx_data;
119         u32 ramdac_idx_ctl;
120         u32 ramdac_xxx[1784];
121 };
122
123 struct p9100_cmd_parameng {
124         u32 parameng_status;
125         u32 parameng_bltcmd;
126         u32 parameng_quadcmd;
127 };
128
129 struct p9100_par {
130         spinlock_t              lock;
131         struct p9100_regs       __iomem *regs;
132
133         u32                     flags;
134 #define P9100_FLAG_BLANKED      0x00000001
135
136         unsigned long           which_io;
137 };
138
139 /**
140  *      p9100_setcolreg - Optional function. Sets a color register.
141  *      @regno: boolean, 0 copy local, 1 get_user() function
142  *      @red: frame buffer colormap structure
143  *      @green: The green value which can be up to 16 bits wide
144  *      @blue:  The blue value which can be up to 16 bits wide.
145  *      @transp: If supported the alpha value which can be up to 16 bits wide.
146  *      @info: frame buffer info structure
147  */
148 static int p9100_setcolreg(unsigned regno,
149                            unsigned red, unsigned green, unsigned blue,
150                            unsigned transp, struct fb_info *info)
151 {
152         struct p9100_par *par = (struct p9100_par *) info->par;
153         struct p9100_regs __iomem *regs = par->regs;
154         unsigned long flags;
155
156         if (regno >= 256)
157                 return 1;
158
159         red >>= 8;
160         green >>= 8;
161         blue >>= 8;
162
163         spin_lock_irqsave(&par->lock, flags);
164
165         sbus_writel((regno << 16), &regs->ramdac_cmap_wridx);
166         sbus_writel((red << 16), &regs->ramdac_palette_data);
167         sbus_writel((green << 16), &regs->ramdac_palette_data);
168         sbus_writel((blue << 16), &regs->ramdac_palette_data);
169
170         spin_unlock_irqrestore(&par->lock, flags);
171
172         return 0;
173 }
174
175 /**
176  *      p9100_blank - Optional function.  Blanks the display.
177  *      @blank_mode: the blank mode we want.
178  *      @info: frame buffer structure that represents a single frame buffer
179  */
180 static int
181 p9100_blank(int blank, struct fb_info *info)
182 {
183         struct p9100_par *par = (struct p9100_par *) info->par;
184         struct p9100_regs __iomem *regs = par->regs;
185         unsigned long flags;
186         u32 val;
187
188         spin_lock_irqsave(&par->lock, flags);
189
190         switch (blank) {
191         case FB_BLANK_UNBLANK: /* Unblanking */
192                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
193                 val |= SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
194                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
195                 par->flags &= ~P9100_FLAG_BLANKED;
196                 break;
197
198         case FB_BLANK_NORMAL: /* Normal blanking */
199         case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
200         case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
201         case FB_BLANK_POWERDOWN: /* Poweroff */
202                 val = sbus_readl(&regs->vid_screenpaint_timectl1);
203                 val &= ~SCREENPAINT_TIMECTL1_ENABLE_VIDEO;
204                 sbus_writel(val, &regs->vid_screenpaint_timectl1);
205                 par->flags |= P9100_FLAG_BLANKED;
206                 break;
207         }
208
209         spin_unlock_irqrestore(&par->lock, flags);
210
211         return 0;
212 }
213
214 static struct sbus_mmap_map p9100_mmap_map[] = {
215         { CG3_MMAP_OFFSET,      0,              SBUS_MMAP_FBSIZE(1) },
216         { 0,                    0,              0                   }
217 };
218
219 static int p9100_mmap(struct fb_info *info, struct vm_area_struct *vma)
220 {
221         struct p9100_par *par = (struct p9100_par *)info->par;
222
223         return sbusfb_mmap_helper(p9100_mmap_map,
224                                   info->fix.smem_start, info->fix.smem_len,
225                                   par->which_io, vma);
226 }
227
228 static int p9100_ioctl(struct fb_info *info, unsigned int cmd,
229                        unsigned long arg)
230 {
231         /* Make it look like a cg3. */
232         return sbusfb_ioctl_helper(cmd, arg, info,
233                                    FBTYPE_SUN3COLOR, 8, info->fix.smem_len);
234 }
235
236 /*
237  *  Initialisation
238  */
239
240 static void p9100_init_fix(struct fb_info *info, int linebytes, struct device_node *dp)
241 {
242         strlcpy(info->fix.id, dp->name, sizeof(info->fix.id));
243
244         info->fix.type = FB_TYPE_PACKED_PIXELS;
245         info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
246
247         info->fix.line_length = linebytes;
248
249         info->fix.accel = FB_ACCEL_SUN_CGTHREE;
250 }
251
252 static int __devinit p9100_probe(struct platform_device *op)
253 {
254         struct device_node *dp = op->dev.of_node;
255         struct fb_info *info;
256         struct p9100_par *par;
257         int linebytes, err;
258
259         info = framebuffer_alloc(sizeof(struct p9100_par), &op->dev);
260
261         err = -ENOMEM;
262         if (!info)
263                 goto out_err;
264         par = info->par;
265
266         spin_lock_init(&par->lock);
267
268         /* This is the framebuffer and the only resource apps can mmap.  */
269         info->fix.smem_start = op->resource[2].start;
270         par->which_io = op->resource[2].flags & IORESOURCE_BITS;
271
272         sbusfb_fill_var(&info->var, dp, 8);
273         info->var.red.length = 8;
274         info->var.green.length = 8;
275         info->var.blue.length = 8;
276
277         linebytes = of_getintprop_default(dp, "linebytes", info->var.xres);
278         info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
279
280         par->regs = of_ioremap(&op->resource[0], 0,
281                                sizeof(struct p9100_regs), "p9100 regs");
282         if (!par->regs)
283                 goto out_release_fb;
284
285         info->flags = FBINFO_DEFAULT;
286         info->fbops = &p9100_ops;
287         info->screen_base = of_ioremap(&op->resource[2], 0,
288                                        info->fix.smem_len, "p9100 ram");
289         if (!info->screen_base)
290                 goto out_unmap_regs;
291
292         p9100_blank(FB_BLANK_UNBLANK, info);
293
294         if (fb_alloc_cmap(&info->cmap, 256, 0))
295                 goto out_unmap_screen;
296
297         p9100_init_fix(info, linebytes, dp);
298
299         err = register_framebuffer(info);
300         if (err < 0)
301                 goto out_dealloc_cmap;
302
303         fb_set_cmap(&info->cmap, info);
304
305         dev_set_drvdata(&op->dev, info);
306
307         printk(KERN_INFO "%s: p9100 at %lx:%lx\n",
308                dp->full_name,
309                par->which_io, info->fix.smem_start);
310
311         return 0;
312
313 out_dealloc_cmap:
314         fb_dealloc_cmap(&info->cmap);
315
316 out_unmap_screen:
317         of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
318
319 out_unmap_regs:
320         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
321
322 out_release_fb:
323         framebuffer_release(info);
324
325 out_err:
326         return err;
327 }
328
329 static int __devexit p9100_remove(struct platform_device *op)
330 {
331         struct fb_info *info = dev_get_drvdata(&op->dev);
332         struct p9100_par *par = info->par;
333
334         unregister_framebuffer(info);
335         fb_dealloc_cmap(&info->cmap);
336
337         of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
338         of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
339
340         framebuffer_release(info);
341
342         dev_set_drvdata(&op->dev, NULL);
343
344         return 0;
345 }
346
347 static const struct of_device_id p9100_match[] = {
348         {
349                 .name = "p9100",
350         },
351         {},
352 };
353 MODULE_DEVICE_TABLE(of, p9100_match);
354
355 static struct platform_driver p9100_driver = {
356         .driver = {
357                 .name = "p9100",
358                 .owner = THIS_MODULE,
359                 .of_match_table = p9100_match,
360         },
361         .probe          = p9100_probe,
362         .remove         = __devexit_p(p9100_remove),
363 };
364
365 static int __init p9100_init(void)
366 {
367         if (fb_get_options("p9100fb", NULL))
368                 return -ENODEV;
369
370         return platform_driver_register(&p9100_driver);
371 }
372
373 static void __exit p9100_exit(void)
374 {
375         platform_driver_unregister(&p9100_driver);
376 }
377
378 module_init(p9100_init);
379 module_exit(p9100_exit);
380
381 MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
382 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
383 MODULE_VERSION("2.0");
384 MODULE_LICENSE("GPL");