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
30static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
31			   unsigned, struct fb_info *);
32static int p9100_blank(int, struct fb_info *);
33
34static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
35static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
36
37/*
38 *  Frame buffer operations
39 */
40
41static 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
73struct 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
125struct p9100_cmd_parameng {
126	u32 parameng_status;
127	u32 parameng_bltcmd;
128	u32 parameng_quadcmd;
129};
130
131struct 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 */
152static 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 */
184static int
185p9100_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
218static struct sbus_mmap_map p9100_mmap_map[] = {
219	{ CG3_MMAP_OFFSET,	0,		SBUS_MMAP_FBSIZE(1) },
220	{ 0,			0,		0		    }
221};
222
223static 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
232static 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
246static 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
258struct all_info {
259	struct fb_info info;
260	struct p9100_par par;
261};
262
263static 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(&op->resource[0],
301			   all->par.regs, sizeof(struct p9100_regs));
302		kfree(all);
303		return -ENOMEM;
304	}
305	all->info.par = &all->par;
306
307	p9100_blank(0, &all->info);
308
309	if (fb_alloc_cmap(&all->info.cmap, 256, 0)) {
310		of_iounmap(&op->resource[0],
311			   all->par.regs, sizeof(struct p9100_regs));
312		of_iounmap(&op->resource[2],
313			   all->info.screen_base, all->par.fbsize);
314		kfree(all);
315		return -ENOMEM;
316	}
317
318	p9100_init_fix(&all->info, linebytes, dp);
319
320	err = register_framebuffer(&all->info);
321	if (err < 0) {
322		fb_dealloc_cmap(&all->info.cmap);
323		of_iounmap(&op->resource[0],
324			   all->par.regs, sizeof(struct p9100_regs));
325		of_iounmap(&op->resource[2],
326			   all->info.screen_base, all->par.fbsize);
327		kfree(all);
328		return err;
329	}
330	fb_set_cmap(&all->info.cmap, &all->info);
331
332	dev_set_drvdata(&op->dev, all);
333
334	printk("%s: p9100 at %lx:%lx\n",
335	       dp->full_name,
336	       all->par.which_io, all->par.physbase);
337
338	return 0;
339}
340
341static int __devinit p9100_probe(struct of_device *dev, const struct of_device_id *match)
342{
343	struct of_device *op = to_of_device(&dev->dev);
344
345	return p9100_init_one(op);
346}
347
348static int __devexit p9100_remove(struct of_device *op)
349{
350	struct all_info *all = dev_get_drvdata(&op->dev);
351
352	unregister_framebuffer(&all->info);
353	fb_dealloc_cmap(&all->info.cmap);
354
355	of_iounmap(&op->resource[0], all->par.regs, sizeof(struct p9100_regs));
356	of_iounmap(&op->resource[2], all->info.screen_base, all->par.fbsize);
357
358	kfree(all);
359
360	dev_set_drvdata(&op->dev, NULL);
361
362	return 0;
363}
364
365static struct of_device_id p9100_match[] = {
366	{
367		.name = "p9100",
368	},
369	{},
370};
371MODULE_DEVICE_TABLE(of, p9100_match);
372
373static struct of_platform_driver p9100_driver = {
374	.name		= "p9100",
375	.match_table	= p9100_match,
376	.probe		= p9100_probe,
377	.remove		= __devexit_p(p9100_remove),
378};
379
380static int __init p9100_init(void)
381{
382	if (fb_get_options("p9100fb", NULL))
383		return -ENODEV;
384
385	return of_register_driver(&p9100_driver, &of_bus_type);
386}
387
388static void __exit p9100_exit(void)
389{
390	of_unregister_driver(&p9100_driver);
391}
392
393module_init(p9100_init);
394module_exit(p9100_exit);
395
396MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
397MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
398MODULE_VERSION("2.0");
399MODULE_LICENSE("GPL");
400