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