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
28static int p9100_setcolreg(unsigned, unsigned, unsigned, unsigned,
29			   unsigned, struct fb_info *);
30static int p9100_blank(int, struct fb_info *);
31
32static int p9100_mmap(struct fb_info *, struct vm_area_struct *);
33static int p9100_ioctl(struct fb_info *, unsigned int, unsigned long);
34
35/*
36 *  Frame buffer operations
37 */
38
39static 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
71struct 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
123struct p9100_cmd_parameng {
124	u32 parameng_status;
125	u32 parameng_bltcmd;
126	u32 parameng_quadcmd;
127};
128
129struct 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 */
148static 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 */
180static int
181p9100_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
214static struct sbus_mmap_map p9100_mmap_map[] = {
215	{ CG3_MMAP_OFFSET,	0,		SBUS_MMAP_FBSIZE(1) },
216	{ 0,			0,		0		    }
217};
218
219static 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
228static 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
240static 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
252static int 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
313out_dealloc_cmap:
314	fb_dealloc_cmap(&info->cmap);
315
316out_unmap_screen:
317	of_iounmap(&op->resource[2], info->screen_base, info->fix.smem_len);
318
319out_unmap_regs:
320	of_iounmap(&op->resource[0], par->regs, sizeof(struct p9100_regs));
321
322out_release_fb:
323	framebuffer_release(info);
324
325out_err:
326	return err;
327}
328
329static int 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	return 0;
343}
344
345static const struct of_device_id p9100_match[] = {
346	{
347		.name = "p9100",
348	},
349	{},
350};
351MODULE_DEVICE_TABLE(of, p9100_match);
352
353static struct platform_driver p9100_driver = {
354	.driver = {
355		.name = "p9100",
356		.of_match_table = p9100_match,
357	},
358	.probe		= p9100_probe,
359	.remove		= p9100_remove,
360};
361
362static int __init p9100_init(void)
363{
364	if (fb_get_options("p9100fb", NULL))
365		return -ENODEV;
366
367	return platform_driver_register(&p9100_driver);
368}
369
370static void __exit p9100_exit(void)
371{
372	platform_driver_unregister(&p9100_driver);
373}
374
375module_init(p9100_init);
376module_exit(p9100_exit);
377
378MODULE_DESCRIPTION("framebuffer driver for P9100 chipsets");
379MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
380MODULE_VERSION("2.0");
381MODULE_LICENSE("GPL");
382