xref: /linux/drivers/video/fbdev/leo.c (revision 69bfec7548f4c1595bac0e3ddfc0458a5af31f4c)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /* leo.c: LEO frame buffer driver
3  *
4  * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5  * Copyright (C) 1996-1999 Jakub Jelinek (jj@ultra.linux.cz)
6  * Copyright (C) 1997 Michal Rehacek (Michal.Rehacek@st.mff.cuni.cz)
7  *
8  * Driver layout based loosely on tgafb.c, see that file for credits.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/errno.h>
14 #include <linux/string.h>
15 #include <linux/delay.h>
16 #include <linux/init.h>
17 #include <linux/fb.h>
18 #include <linux/mm.h>
19 #include <linux/of_device.h>
20 #include <linux/io.h>
21 
22 #include <asm/fbio.h>
23 
24 #include "sbuslib.h"
25 
26 /*
27  * Local functions.
28  */
29 
30 static int leo_setcolreg(unsigned, unsigned, unsigned, unsigned,
31 			 unsigned, struct fb_info *);
32 static int leo_blank(int, struct fb_info *);
33 
34 static int leo_mmap(struct fb_info *, struct vm_area_struct *);
35 static int leo_ioctl(struct fb_info *, unsigned int, unsigned long);
36 static int leo_pan_display(struct fb_var_screeninfo *, struct fb_info *);
37 
38 /*
39  *  Frame buffer operations
40  */
41 
42 static const struct fb_ops leo_ops = {
43 	.owner			= THIS_MODULE,
44 	.fb_setcolreg		= leo_setcolreg,
45 	.fb_blank		= leo_blank,
46 	.fb_pan_display		= leo_pan_display,
47 	.fb_fillrect		= cfb_fillrect,
48 	.fb_copyarea		= cfb_copyarea,
49 	.fb_imageblit		= cfb_imageblit,
50 	.fb_mmap		= leo_mmap,
51 	.fb_ioctl		= leo_ioctl,
52 #ifdef CONFIG_COMPAT
53 	.fb_compat_ioctl	= sbusfb_compat_ioctl,
54 #endif
55 };
56 
57 #define LEO_OFF_LC_SS0_KRN	0x00200000UL
58 #define LEO_OFF_LC_SS0_USR	0x00201000UL
59 #define LEO_OFF_LC_SS1_KRN	0x01200000UL
60 #define LEO_OFF_LC_SS1_USR	0x01201000UL
61 #define LEO_OFF_LD_SS0		0x00400000UL
62 #define LEO_OFF_LD_SS1		0x01400000UL
63 #define LEO_OFF_LD_GBL		0x00401000UL
64 #define LEO_OFF_LX_KRN		0x00600000UL
65 #define LEO_OFF_LX_CURSOR	0x00601000UL
66 #define LEO_OFF_SS0		0x00800000UL
67 #define LEO_OFF_SS1		0x01800000UL
68 #define LEO_OFF_UNK		0x00602000UL
69 #define LEO_OFF_UNK2		0x00000000UL
70 
71 #define LEO_CUR_ENABLE		0x00000080
72 #define LEO_CUR_UPDATE		0x00000030
73 #define LEO_CUR_PROGRESS	0x00000006
74 #define LEO_CUR_UPDATECMAP	0x00000003
75 
76 #define LEO_CUR_TYPE_MASK	0x00000000
77 #define LEO_CUR_TYPE_IMAGE	0x00000020
78 #define LEO_CUR_TYPE_CMAP	0x00000050
79 
80 struct leo_cursor {
81 	u8	xxx0[16];
82 	u32	cur_type;
83 	u32	cur_misc;
84 	u32	cur_cursxy;
85 	u32	cur_data;
86 };
87 
88 #define LEO_KRN_TYPE_CLUT0	0x00001000
89 #define LEO_KRN_TYPE_CLUT1	0x00001001
90 #define LEO_KRN_TYPE_CLUT2	0x00001002
91 #define LEO_KRN_TYPE_WID	0x00001003
92 #define LEO_KRN_TYPE_UNK	0x00001006
93 #define LEO_KRN_TYPE_VIDEO	0x00002003
94 #define LEO_KRN_TYPE_CLUTDATA	0x00004000
95 #define LEO_KRN_CSR_ENABLE	0x00000008
96 #define LEO_KRN_CSR_PROGRESS	0x00000004
97 #define LEO_KRN_CSR_UNK		0x00000002
98 #define LEO_KRN_CSR_UNK2	0x00000001
99 
100 struct leo_lx_krn {
101 	u32	krn_type;
102 	u32	krn_csr;
103 	u32	krn_value;
104 };
105 
106 struct leo_lc_ss0_krn {
107 	u32 	misc;
108 	u8	xxx0[0x800-4];
109 	u32	rev;
110 };
111 
112 struct leo_lc_ss0_usr {
113 	u32	csr;
114 	u32	addrspace;
115 	u32 	fontmsk;
116 	u32	fontt;
117 	u32	extent;
118 	u32	src;
119 	u32	dst;
120 	u32	copy;
121 	u32	fill;
122 };
123 
124 struct leo_lc_ss1_krn {
125 	u8	unknown;
126 };
127 
128 struct leo_lc_ss1_usr {
129 	u8	unknown;
130 };
131 
132 struct leo_ld_ss0 {
133 	u8	xxx0[0xe00];
134 	u32	csr;
135 	u32	wid;
136 	u32	wmask;
137 	u32	widclip;
138 	u32	vclipmin;
139 	u32	vclipmax;
140 	u32	pickmin;	/* SS1 only */
141 	u32	pickmax;	/* SS1 only */
142 	u32	fg;
143 	u32	bg;
144 	u32	src;		/* Copy/Scroll (SS0 only) */
145 	u32	dst;		/* Copy/Scroll/Fill (SS0 only) */
146 	u32	extent;		/* Copy/Scroll/Fill size (SS0 only) */
147 	u32	xxx1[3];
148 	u32	setsem;		/* SS1 only */
149 	u32	clrsem;		/* SS1 only */
150 	u32	clrpick;	/* SS1 only */
151 	u32	clrdat;		/* SS1 only */
152 	u32	alpha;		/* SS1 only */
153 	u8	xxx2[0x2c];
154 	u32	winbg;
155 	u32	planemask;
156 	u32	rop;
157 	u32	z;
158 	u32	dczf;		/* SS1 only */
159 	u32	dczb;		/* SS1 only */
160 	u32	dcs;		/* SS1 only */
161 	u32	dczs;		/* SS1 only */
162 	u32	pickfb;		/* SS1 only */
163 	u32	pickbb;		/* SS1 only */
164 	u32	dcfc;		/* SS1 only */
165 	u32	forcecol;	/* SS1 only */
166 	u32	door[8];	/* SS1 only */
167 	u32	pick[5];	/* SS1 only */
168 };
169 
170 #define LEO_SS1_MISC_ENABLE	0x00000001
171 #define LEO_SS1_MISC_STEREO	0x00000002
172 struct leo_ld_ss1 {
173 	u8	xxx0[0xef4];
174 	u32	ss1_misc;
175 };
176 
177 struct leo_ld_gbl {
178 	u8	unknown;
179 };
180 
181 struct leo_par {
182 	spinlock_t		lock;
183 	struct leo_lx_krn	__iomem *lx_krn;
184 	struct leo_lc_ss0_usr	__iomem *lc_ss0_usr;
185 	struct leo_ld_ss0	__iomem *ld_ss0;
186 	struct leo_ld_ss1	__iomem *ld_ss1;
187 	struct leo_cursor	__iomem *cursor;
188 	u32			extent;
189 	u32			clut_data[256];
190 
191 	u32			flags;
192 #define LEO_FLAG_BLANKED	0x00000001
193 
194 	unsigned long		which_io;
195 };
196 
197 static void leo_wait(struct leo_lx_krn __iomem *lx_krn)
198 {
199 	int i;
200 
201 	for (i = 0;
202 	     (sbus_readl(&lx_krn->krn_csr) & LEO_KRN_CSR_PROGRESS) &&
203 	     i < 300000;
204 	     i++)
205 		udelay(1); /* Busy wait at most 0.3 sec */
206 	return;
207 }
208 
209 static void leo_switch_from_graph(struct fb_info *info)
210 {
211 	struct leo_par *par = (struct leo_par *) info->par;
212 	struct leo_ld_ss0 __iomem *ss = par->ld_ss0;
213 	struct leo_cursor __iomem *cursor = par->cursor;
214 	unsigned long flags;
215 	u32 val;
216 
217 	spin_lock_irqsave(&par->lock, flags);
218 
219 	par->extent = ((info->var.xres - 1) |
220 		       ((info->var.yres - 1) << 16));
221 
222 	sbus_writel(0xffffffff, &ss->wid);
223 	sbus_writel(0xffff, &ss->wmask);
224 	sbus_writel(0, &ss->vclipmin);
225 	sbus_writel(par->extent, &ss->vclipmax);
226 	sbus_writel(0, &ss->fg);
227 	sbus_writel(0xff000000, &ss->planemask);
228 	sbus_writel(0x310850, &ss->rop);
229 	sbus_writel(0, &ss->widclip);
230 	sbus_writel((info->var.xres-1) | ((info->var.yres-1) << 11),
231 		    &par->lc_ss0_usr->extent);
232 	sbus_writel(4, &par->lc_ss0_usr->addrspace);
233 	sbus_writel(0x80000000, &par->lc_ss0_usr->fill);
234 	sbus_writel(0, &par->lc_ss0_usr->fontt);
235 	do {
236 		val = sbus_readl(&par->lc_ss0_usr->csr);
237 	} while (val & 0x20000000);
238 
239 	/* setup screen buffer for cfb_* functions */
240 	sbus_writel(1, &ss->wid);
241 	sbus_writel(0x00ffffff, &ss->planemask);
242 	sbus_writel(0x310b90, &ss->rop);
243 	sbus_writel(0, &par->lc_ss0_usr->addrspace);
244 
245 	/* hide cursor */
246 	sbus_writel(sbus_readl(&cursor->cur_misc) & ~LEO_CUR_ENABLE, &cursor->cur_misc);
247 
248 	spin_unlock_irqrestore(&par->lock, flags);
249 }
250 
251 static int leo_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
252 {
253 	/* We just use this to catch switches out of
254 	 * graphics mode.
255 	 */
256 	leo_switch_from_graph(info);
257 
258 	if (var->xoffset || var->yoffset || var->vmode)
259 		return -EINVAL;
260 	return 0;
261 }
262 
263 /**
264  *      leo_setcolreg - Optional function. Sets a color register.
265  *      @regno: boolean, 0 copy local, 1 get_user() function
266  *      @red: frame buffer colormap structure
267  *      @green: The green value which can be up to 16 bits wide
268  *      @blue:  The blue value which can be up to 16 bits wide.
269  *      @transp: If supported the alpha value which can be up to 16 bits wide.
270  *      @info: frame buffer info structure
271  */
272 static int leo_setcolreg(unsigned regno,
273 			 unsigned red, unsigned green, unsigned blue,
274 			 unsigned transp, struct fb_info *info)
275 {
276 	struct leo_par *par = (struct leo_par *) info->par;
277 	struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
278 	unsigned long flags;
279 	u32 val;
280 	int i;
281 
282 	if (regno >= 256)
283 		return 1;
284 
285 	red >>= 8;
286 	green >>= 8;
287 	blue >>= 8;
288 
289 	par->clut_data[regno] = red | (green << 8) | (blue << 16);
290 
291 	spin_lock_irqsave(&par->lock, flags);
292 
293 	leo_wait(lx_krn);
294 
295 	sbus_writel(LEO_KRN_TYPE_CLUTDATA, &lx_krn->krn_type);
296 	for (i = 0; i < 256; i++)
297 		sbus_writel(par->clut_data[i], &lx_krn->krn_value);
298 	sbus_writel(LEO_KRN_TYPE_CLUT0, &lx_krn->krn_type);
299 
300 	val = sbus_readl(&lx_krn->krn_csr);
301 	val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
302 	sbus_writel(val, &lx_krn->krn_csr);
303 
304 	spin_unlock_irqrestore(&par->lock, flags);
305 
306 	return 0;
307 }
308 
309 /**
310  *      leo_blank - Optional function.  Blanks the display.
311  *      @blank: the blank mode we want.
312  *      @info: frame buffer structure that represents a single frame buffer
313  */
314 static int leo_blank(int blank, struct fb_info *info)
315 {
316 	struct leo_par *par = (struct leo_par *) info->par;
317 	struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
318 	unsigned long flags;
319 	u32 val;
320 
321 	spin_lock_irqsave(&par->lock, flags);
322 
323 	switch (blank) {
324 	case FB_BLANK_UNBLANK: /* Unblanking */
325 		val = sbus_readl(&lx_krn->krn_csr);
326 		val |= LEO_KRN_CSR_ENABLE;
327 		sbus_writel(val, &lx_krn->krn_csr);
328 		par->flags &= ~LEO_FLAG_BLANKED;
329 		break;
330 
331 	case FB_BLANK_NORMAL: /* Normal blanking */
332 	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
333 	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
334 	case FB_BLANK_POWERDOWN: /* Poweroff */
335 		val = sbus_readl(&lx_krn->krn_csr);
336 		val &= ~LEO_KRN_CSR_ENABLE;
337 		sbus_writel(val, &lx_krn->krn_csr);
338 		par->flags |= LEO_FLAG_BLANKED;
339 		break;
340 	}
341 
342 	spin_unlock_irqrestore(&par->lock, flags);
343 
344 	return 0;
345 }
346 
347 static struct sbus_mmap_map leo_mmap_map[] = {
348 	{
349 		.voff	= LEO_SS0_MAP,
350 		.poff	= LEO_OFF_SS0,
351 		.size	= 0x800000
352 	},
353 	{
354 		.voff	= LEO_LC_SS0_USR_MAP,
355 		.poff	= LEO_OFF_LC_SS0_USR,
356 		.size	= 0x1000
357 	},
358 	{
359 		.voff	= LEO_LD_SS0_MAP,
360 		.poff	= LEO_OFF_LD_SS0,
361 		.size	= 0x1000
362 	},
363 	{
364 		.voff	= LEO_LX_CURSOR_MAP,
365 		.poff	= LEO_OFF_LX_CURSOR,
366 		.size	= 0x1000
367 	},
368 	{
369 		.voff	= LEO_SS1_MAP,
370 		.poff	= LEO_OFF_SS1,
371 		.size	= 0x800000
372 	},
373 	{
374 		.voff	= LEO_LC_SS1_USR_MAP,
375 		.poff	= LEO_OFF_LC_SS1_USR,
376 		.size	= 0x1000
377 	},
378 	{
379 		.voff	= LEO_LD_SS1_MAP,
380 		.poff	= LEO_OFF_LD_SS1,
381 		.size	= 0x1000
382 	},
383 	{
384 		.voff	= LEO_UNK_MAP,
385 		.poff	= LEO_OFF_UNK,
386 		.size	= 0x1000
387 	},
388 	{
389 		.voff	= LEO_LX_KRN_MAP,
390 		.poff	= LEO_OFF_LX_KRN,
391 		.size	= 0x1000
392 	},
393 	{
394 		.voff	= LEO_LC_SS0_KRN_MAP,
395 		.poff	= LEO_OFF_LC_SS0_KRN,
396 		.size	= 0x1000
397 	},
398 	{
399 		.voff	= LEO_LC_SS1_KRN_MAP,
400 		.poff	= LEO_OFF_LC_SS1_KRN,
401 		.size	= 0x1000
402 	},
403 	{
404 		.voff	= LEO_LD_GBL_MAP,
405 		.poff	= LEO_OFF_LD_GBL,
406 		.size	= 0x1000
407 	},
408 	{
409 		.voff	= LEO_UNK2_MAP,
410 		.poff	= LEO_OFF_UNK2,
411 		.size	= 0x100000
412 	},
413 	{ .size = 0 }
414 };
415 
416 static int leo_mmap(struct fb_info *info, struct vm_area_struct *vma)
417 {
418 	struct leo_par *par = (struct leo_par *)info->par;
419 
420 	return sbusfb_mmap_helper(leo_mmap_map,
421 				  info->fix.smem_start, info->fix.smem_len,
422 				  par->which_io, vma);
423 }
424 
425 static int leo_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
426 {
427 	return sbusfb_ioctl_helper(cmd, arg, info,
428 				   FBTYPE_SUNLEO, 32, info->fix.smem_len);
429 }
430 
431 /*
432  *  Initialisation
433  */
434 
435 static void
436 leo_init_fix(struct fb_info *info, struct device_node *dp)
437 {
438 	snprintf(info->fix.id, sizeof(info->fix.id), "%pOFn", dp);
439 
440 	info->fix.type = FB_TYPE_PACKED_PIXELS;
441 	info->fix.visual = FB_VISUAL_TRUECOLOR;
442 
443 	info->fix.line_length = 8192;
444 
445 	info->fix.accel = FB_ACCEL_SUN_LEO;
446 }
447 
448 static void leo_wid_put(struct fb_info *info, struct fb_wid_list *wl)
449 {
450 	struct leo_par *par = (struct leo_par *) info->par;
451 	struct leo_lx_krn __iomem *lx_krn = par->lx_krn;
452 	struct fb_wid_item *wi;
453 	unsigned long flags;
454 	u32 val;
455 	int i, j;
456 
457 	spin_lock_irqsave(&par->lock, flags);
458 
459 	leo_wait(lx_krn);
460 
461 	for (i = 0, wi = wl->wl_list; i < wl->wl_count; i++, wi++) {
462 		switch (wi->wi_type) {
463 		case FB_WID_DBL_8:
464 			j = (wi->wi_index & 0xf) + 0x40;
465 			break;
466 
467 		case FB_WID_DBL_24:
468 			j = wi->wi_index & 0x3f;
469 			break;
470 
471 		default:
472 			continue;
473 		}
474 		sbus_writel(0x5800 + j, &lx_krn->krn_type);
475 		sbus_writel(wi->wi_values[0], &lx_krn->krn_value);
476 	}
477 	sbus_writel(LEO_KRN_TYPE_WID, &lx_krn->krn_type);
478 
479 	val = sbus_readl(&lx_krn->krn_csr);
480 	val |= (LEO_KRN_CSR_UNK | LEO_KRN_CSR_UNK2);
481 	sbus_writel(val, &lx_krn->krn_csr);
482 
483 	spin_unlock_irqrestore(&par->lock, flags);
484 }
485 
486 static void leo_init_wids(struct fb_info *info)
487 {
488 	struct fb_wid_item wi;
489 	struct fb_wid_list wl;
490 
491 	wl.wl_count = 1;
492 	wl.wl_list = &wi;
493 	wi.wi_type = FB_WID_DBL_8;
494 	wi.wi_index = 0;
495 	wi.wi_values [0] = 0x2c0;
496 	leo_wid_put(info, &wl);
497 	wi.wi_index = 1;
498 	wi.wi_values [0] = 0x30;
499 	leo_wid_put(info, &wl);
500 	wi.wi_index = 2;
501 	wi.wi_values [0] = 0x20;
502 	leo_wid_put(info, &wl);
503 	wi.wi_type = FB_WID_DBL_24;
504 	wi.wi_index = 1;
505 	wi.wi_values [0] = 0x30;
506 	leo_wid_put(info, &wl);
507 }
508 
509 static void leo_init_hw(struct fb_info *info)
510 {
511 	struct leo_par *par = (struct leo_par *) info->par;
512 	u32 val;
513 
514 	val = sbus_readl(&par->ld_ss1->ss1_misc);
515 	val |= LEO_SS1_MISC_ENABLE;
516 	sbus_writel(val, &par->ld_ss1->ss1_misc);
517 
518 	leo_switch_from_graph(info);
519 }
520 
521 static void leo_fixup_var_rgb(struct fb_var_screeninfo *var)
522 {
523 	var->red.offset = 0;
524 	var->red.length = 8;
525 	var->green.offset = 8;
526 	var->green.length = 8;
527 	var->blue.offset = 16;
528 	var->blue.length = 8;
529 	var->transp.offset = 0;
530 	var->transp.length = 0;
531 }
532 
533 static void leo_unmap_regs(struct platform_device *op, struct fb_info *info,
534 			   struct leo_par *par)
535 {
536 	if (par->lc_ss0_usr)
537 		of_iounmap(&op->resource[0], par->lc_ss0_usr, 0x1000);
538 	if (par->ld_ss0)
539 		of_iounmap(&op->resource[0], par->ld_ss0, 0x1000);
540 	if (par->ld_ss1)
541 		of_iounmap(&op->resource[0], par->ld_ss1, 0x1000);
542 	if (par->lx_krn)
543 		of_iounmap(&op->resource[0], par->lx_krn, 0x1000);
544 	if (par->cursor)
545 		of_iounmap(&op->resource[0],
546 			   par->cursor, sizeof(struct leo_cursor));
547 	if (info->screen_base)
548 		of_iounmap(&op->resource[0], info->screen_base, 0x800000);
549 }
550 
551 static int leo_probe(struct platform_device *op)
552 {
553 	struct device_node *dp = op->dev.of_node;
554 	struct fb_info *info;
555 	struct leo_par *par;
556 	int linebytes, err;
557 
558 	info = framebuffer_alloc(sizeof(struct leo_par), &op->dev);
559 
560 	err = -ENOMEM;
561 	if (!info)
562 		goto out_err;
563 	par = info->par;
564 
565 	spin_lock_init(&par->lock);
566 
567 	info->fix.smem_start = op->resource[0].start;
568 	par->which_io = op->resource[0].flags & IORESOURCE_BITS;
569 
570 	sbusfb_fill_var(&info->var, dp, 32);
571 	leo_fixup_var_rgb(&info->var);
572 
573 	linebytes = of_getintprop_default(dp, "linebytes",
574 					  info->var.xres);
575 	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
576 
577 	par->lc_ss0_usr =
578 		of_ioremap(&op->resource[0], LEO_OFF_LC_SS0_USR,
579 			   0x1000, "leolc ss0usr");
580 	par->ld_ss0 =
581 		of_ioremap(&op->resource[0], LEO_OFF_LD_SS0,
582 			   0x1000, "leold ss0");
583 	par->ld_ss1 =
584 		of_ioremap(&op->resource[0], LEO_OFF_LD_SS1,
585 			   0x1000, "leold ss1");
586 	par->lx_krn =
587 		of_ioremap(&op->resource[0], LEO_OFF_LX_KRN,
588 			   0x1000, "leolx krn");
589 	par->cursor =
590 		of_ioremap(&op->resource[0], LEO_OFF_LX_CURSOR,
591 			   sizeof(struct leo_cursor), "leolx cursor");
592 	info->screen_base =
593 		of_ioremap(&op->resource[0], LEO_OFF_SS0,
594 			   0x800000, "leo ram");
595 	if (!par->lc_ss0_usr ||
596 	    !par->ld_ss0 ||
597 	    !par->ld_ss1 ||
598 	    !par->lx_krn ||
599 	    !par->cursor ||
600 	    !info->screen_base)
601 		goto out_unmap_regs;
602 
603 	info->flags = FBINFO_DEFAULT;
604 	info->fbops = &leo_ops;
605 	info->pseudo_palette = par->clut_data;
606 
607 	leo_init_wids(info);
608 	leo_init_hw(info);
609 
610 	leo_blank(FB_BLANK_UNBLANK, info);
611 
612 	if (fb_alloc_cmap(&info->cmap, 256, 0))
613 		goto out_unmap_regs;
614 
615 	leo_init_fix(info, dp);
616 
617 	err = register_framebuffer(info);
618 	if (err < 0)
619 		goto out_dealloc_cmap;
620 
621 	dev_set_drvdata(&op->dev, info);
622 
623 	printk(KERN_INFO "%pOF: leo at %lx:%lx\n",
624 	       dp,
625 	       par->which_io, info->fix.smem_start);
626 
627 	return 0;
628 
629 out_dealloc_cmap:
630 	fb_dealloc_cmap(&info->cmap);
631 
632 out_unmap_regs:
633 	leo_unmap_regs(op, info, par);
634 	framebuffer_release(info);
635 
636 out_err:
637 	return err;
638 }
639 
640 static int leo_remove(struct platform_device *op)
641 {
642 	struct fb_info *info = dev_get_drvdata(&op->dev);
643 	struct leo_par *par = info->par;
644 
645 	unregister_framebuffer(info);
646 	fb_dealloc_cmap(&info->cmap);
647 
648 	leo_unmap_regs(op, info, par);
649 
650 	framebuffer_release(info);
651 
652 	return 0;
653 }
654 
655 static const struct of_device_id leo_match[] = {
656 	{
657 		.name = "SUNW,leo",
658 	},
659 	{},
660 };
661 MODULE_DEVICE_TABLE(of, leo_match);
662 
663 static struct platform_driver leo_driver = {
664 	.driver = {
665 		.name = "leo",
666 		.of_match_table = leo_match,
667 	},
668 	.probe		= leo_probe,
669 	.remove		= leo_remove,
670 };
671 
672 static int __init leo_init(void)
673 {
674 	if (fb_get_options("leofb", NULL))
675 		return -ENODEV;
676 
677 	return platform_driver_register(&leo_driver);
678 }
679 
680 static void __exit leo_exit(void)
681 {
682 	platform_driver_unregister(&leo_driver);
683 }
684 
685 module_init(leo_init);
686 module_exit(leo_exit);
687 
688 MODULE_DESCRIPTION("framebuffer driver for LEO chipsets");
689 MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
690 MODULE_VERSION("2.0");
691 MODULE_LICENSE("GPL");
692