1// SPDX-License-Identifier: GPL-2.0-only
2/* bw2.c: BWTWO frame buffer driver
3 *
4 * Copyright (C) 2003, 2006 David S. Miller (davem@davemloft.net)
5 * Copyright (C) 1996,1998 Jakub Jelinek (jj@ultra.linux.cz)
6 * Copyright (C) 1996 Miguel de Icaza (miguel@nuclecu.unam.mx)
7 * Copyright (C) 1997 Eddie C. Dost (ecd@skynet.be)
8 *
9 * Driver layout based loosely on tgafb.c, see that file for credits.
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/errno.h>
15#include <linux/string.h>
16#include <linux/delay.h>
17#include <linux/init.h>
18#include <linux/fb.h>
19#include <linux/mm.h>
20#include <linux/of_device.h>
21
22#include <asm/io.h>
23#include <asm/fbio.h>
24
25#include "sbuslib.h"
26
27/*
28 * Local functions.
29 */
30
31static int bw2_blank(int, struct fb_info *);
32
33static int bw2_mmap(struct fb_info *, struct vm_area_struct *);
34static int bw2_ioctl(struct fb_info *, unsigned int, unsigned long);
35
36/*
37 *  Frame buffer operations
38 */
39
40static const struct fb_ops bw2_ops = {
41	.owner			= THIS_MODULE,
42	.fb_blank		= bw2_blank,
43	.fb_fillrect		= cfb_fillrect,
44	.fb_copyarea		= cfb_copyarea,
45	.fb_imageblit		= cfb_imageblit,
46	.fb_mmap		= bw2_mmap,
47	.fb_ioctl		= bw2_ioctl,
48#ifdef CONFIG_COMPAT
49	.fb_compat_ioctl	= sbusfb_compat_ioctl,
50#endif
51};
52
53/* OBio addresses for the bwtwo registers */
54#define BWTWO_REGISTER_OFFSET 0x400000
55
56struct bt_regs {
57	u32 addr;
58	u32 color_map;
59	u32 control;
60	u32 cursor;
61};
62
63struct bw2_regs {
64	struct bt_regs	cmap;
65	u8	control;
66	u8	status;
67	u8	cursor_start;
68	u8	cursor_end;
69	u8	h_blank_start;
70	u8	h_blank_end;
71	u8	h_sync_start;
72	u8	h_sync_end;
73	u8	comp_sync_end;
74	u8	v_blank_start_high;
75	u8	v_blank_start_low;
76	u8	v_blank_end;
77	u8	v_sync_start;
78	u8	v_sync_end;
79	u8	xfer_holdoff_start;
80	u8	xfer_holdoff_end;
81};
82
83/* Status Register Constants */
84#define BWTWO_SR_RES_MASK	0x70
85#define BWTWO_SR_1600_1280	0x50
86#define BWTWO_SR_1152_900_76_A	0x40
87#define BWTWO_SR_1152_900_76_B	0x60
88#define BWTWO_SR_ID_MASK	0x0f
89#define BWTWO_SR_ID_MONO	0x02
90#define BWTWO_SR_ID_MONO_ECL	0x03
91#define BWTWO_SR_ID_MSYNC	0x04
92#define BWTWO_SR_ID_NOCONN	0x0a
93
94/* Control Register Constants */
95#define BWTWO_CTL_ENABLE_INTS   0x80
96#define BWTWO_CTL_ENABLE_VIDEO  0x40
97#define BWTWO_CTL_ENABLE_TIMING 0x20
98#define BWTWO_CTL_ENABLE_CURCMP 0x10
99#define BWTWO_CTL_XTAL_MASK     0x0C
100#define BWTWO_CTL_DIVISOR_MASK  0x03
101
102/* Status Register Constants */
103#define BWTWO_STAT_PENDING_INT  0x80
104#define BWTWO_STAT_MSENSE_MASK  0x70
105#define BWTWO_STAT_ID_MASK      0x0f
106
107struct bw2_par {
108	spinlock_t		lock;
109	struct bw2_regs		__iomem *regs;
110
111	u32			flags;
112#define BW2_FLAG_BLANKED	0x00000001
113
114	unsigned long		which_io;
115};
116
117/**
118 *      bw2_blank - Optional function.  Blanks the display.
119 *      @blank_mode: the blank mode we want.
120 *      @info: frame buffer structure that represents a single frame buffer
121 */
122static int
123bw2_blank(int blank, struct fb_info *info)
124{
125	struct bw2_par *par = (struct bw2_par *) info->par;
126	struct bw2_regs __iomem *regs = par->regs;
127	unsigned long flags;
128	u8 val;
129
130	spin_lock_irqsave(&par->lock, flags);
131
132	switch (blank) {
133	case FB_BLANK_UNBLANK: /* Unblanking */
134		val = sbus_readb(&regs->control);
135		val |= BWTWO_CTL_ENABLE_VIDEO;
136		sbus_writeb(val, &regs->control);
137		par->flags &= ~BW2_FLAG_BLANKED;
138		break;
139
140	case FB_BLANK_NORMAL: /* Normal blanking */
141	case FB_BLANK_VSYNC_SUSPEND: /* VESA blank (vsync off) */
142	case FB_BLANK_HSYNC_SUSPEND: /* VESA blank (hsync off) */
143	case FB_BLANK_POWERDOWN: /* Poweroff */
144		val = sbus_readb(&regs->control);
145		val &= ~BWTWO_CTL_ENABLE_VIDEO;
146		sbus_writeb(val, &regs->control);
147		par->flags |= BW2_FLAG_BLANKED;
148		break;
149	}
150
151	spin_unlock_irqrestore(&par->lock, flags);
152
153	return 0;
154}
155
156static struct sbus_mmap_map bw2_mmap_map[] = {
157	{
158		.size = SBUS_MMAP_FBSIZE(1)
159	},
160	{ .size = 0 }
161};
162
163static int bw2_mmap(struct fb_info *info, struct vm_area_struct *vma)
164{
165	struct bw2_par *par = (struct bw2_par *)info->par;
166
167	return sbusfb_mmap_helper(bw2_mmap_map,
168				  info->fix.smem_start, info->fix.smem_len,
169				  par->which_io,
170				  vma);
171}
172
173static int bw2_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg)
174{
175	return sbusfb_ioctl_helper(cmd, arg, info,
176				   FBTYPE_SUN2BW, 1, info->fix.smem_len);
177}
178
179/*
180 *  Initialisation
181 */
182
183static void bw2_init_fix(struct fb_info *info, int linebytes)
184{
185	strlcpy(info->fix.id, "bwtwo", sizeof(info->fix.id));
186
187	info->fix.type = FB_TYPE_PACKED_PIXELS;
188	info->fix.visual = FB_VISUAL_MONO01;
189
190	info->fix.line_length = linebytes;
191
192	info->fix.accel = FB_ACCEL_SUN_BWTWO;
193}
194
195static u8 bw2regs_1600[] = {
196	0x14, 0x8b,	0x15, 0x28,	0x16, 0x03,	0x17, 0x13,
197	0x18, 0x7b,	0x19, 0x05,	0x1a, 0x34,	0x1b, 0x2e,
198	0x1c, 0x00,	0x1d, 0x0a,	0x1e, 0xff,	0x1f, 0x01,
199	0x10, 0x21,	0
200};
201
202static u8 bw2regs_ecl[] = {
203	0x14, 0x65,	0x15, 0x1e,	0x16, 0x04,	0x17, 0x0c,
204	0x18, 0x5e,	0x19, 0x03,	0x1a, 0xa7,	0x1b, 0x23,
205	0x1c, 0x00,	0x1d, 0x08,	0x1e, 0xff,	0x1f, 0x01,
206	0x10, 0x20,	0
207};
208
209static u8 bw2regs_analog[] = {
210	0x14, 0xbb,	0x15, 0x2b,	0x16, 0x03,	0x17, 0x13,
211	0x18, 0xb0,	0x19, 0x03,	0x1a, 0xa6,	0x1b, 0x22,
212	0x1c, 0x01,	0x1d, 0x05,	0x1e, 0xff,	0x1f, 0x01,
213	0x10, 0x20,	0
214};
215
216static u8 bw2regs_76hz[] = {
217	0x14, 0xb7,	0x15, 0x27,	0x16, 0x03,	0x17, 0x0f,
218	0x18, 0xae,	0x19, 0x03,	0x1a, 0xae,	0x1b, 0x2a,
219	0x1c, 0x01,	0x1d, 0x09,	0x1e, 0xff,	0x1f, 0x01,
220	0x10, 0x24,	0
221};
222
223static u8 bw2regs_66hz[] = {
224	0x14, 0xbb,	0x15, 0x2b,	0x16, 0x04,	0x17, 0x14,
225	0x18, 0xae,	0x19, 0x03,	0x1a, 0xa8,	0x1b, 0x24,
226	0x1c, 0x01,	0x1d, 0x05,	0x1e, 0xff,	0x1f, 0x01,
227	0x10, 0x20,	0
228};
229
230static int bw2_do_default_mode(struct bw2_par *par, struct fb_info *info,
231			       int *linebytes)
232{
233	u8 status, mon;
234	u8 *p;
235
236	status = sbus_readb(&par->regs->status);
237	mon = status & BWTWO_SR_RES_MASK;
238	switch (status & BWTWO_SR_ID_MASK) {
239	case BWTWO_SR_ID_MONO_ECL:
240		if (mon == BWTWO_SR_1600_1280) {
241			p = bw2regs_1600;
242			info->var.xres = info->var.xres_virtual = 1600;
243			info->var.yres = info->var.yres_virtual = 1280;
244			*linebytes = 1600 / 8;
245		} else
246			p = bw2regs_ecl;
247		break;
248
249	case BWTWO_SR_ID_MONO:
250		p = bw2regs_analog;
251		break;
252
253	case BWTWO_SR_ID_MSYNC:
254		if (mon == BWTWO_SR_1152_900_76_A ||
255		    mon == BWTWO_SR_1152_900_76_B)
256			p = bw2regs_76hz;
257		else
258			p = bw2regs_66hz;
259		break;
260
261	case BWTWO_SR_ID_NOCONN:
262		return 0;
263
264	default:
265		printk(KERN_ERR "bw2: can't handle SR %02x\n",
266		       status);
267		return -EINVAL;
268	}
269	for ( ; *p; p += 2) {
270		u8 __iomem *regp = &((u8 __iomem *)par->regs)[p[0]];
271		sbus_writeb(p[1], regp);
272	}
273	return 0;
274}
275
276static int bw2_probe(struct platform_device *op)
277{
278	struct device_node *dp = op->dev.of_node;
279	struct fb_info *info;
280	struct bw2_par *par;
281	int linebytes, err;
282
283	info = framebuffer_alloc(sizeof(struct bw2_par), &op->dev);
284
285	err = -ENOMEM;
286	if (!info)
287		goto out_err;
288	par = info->par;
289
290	spin_lock_init(&par->lock);
291
292	info->fix.smem_start = op->resource[0].start;
293	par->which_io = op->resource[0].flags & IORESOURCE_BITS;
294
295	sbusfb_fill_var(&info->var, dp, 1);
296	linebytes = of_getintprop_default(dp, "linebytes",
297					  info->var.xres);
298
299	info->var.red.length = info->var.green.length =
300		info->var.blue.length = info->var.bits_per_pixel;
301	info->var.red.offset = info->var.green.offset =
302		info->var.blue.offset = 0;
303
304	par->regs = of_ioremap(&op->resource[0], BWTWO_REGISTER_OFFSET,
305			       sizeof(struct bw2_regs), "bw2 regs");
306	if (!par->regs)
307		goto out_release_fb;
308
309	if (!of_find_property(dp, "width", NULL)) {
310		err = bw2_do_default_mode(par, info, &linebytes);
311		if (err)
312			goto out_unmap_regs;
313	}
314
315	info->fix.smem_len = PAGE_ALIGN(linebytes * info->var.yres);
316
317	info->flags = FBINFO_DEFAULT;
318	info->fbops = &bw2_ops;
319
320	info->screen_base = of_ioremap(&op->resource[0], 0,
321				       info->fix.smem_len, "bw2 ram");
322	if (!info->screen_base) {
323		err = -ENOMEM;
324		goto out_unmap_regs;
325	}
326
327	bw2_blank(FB_BLANK_UNBLANK, info);
328
329	bw2_init_fix(info, linebytes);
330
331	err = register_framebuffer(info);
332	if (err < 0)
333		goto out_unmap_screen;
334
335	dev_set_drvdata(&op->dev, info);
336
337	printk(KERN_INFO "%pOF: bwtwo at %lx:%lx\n",
338	       dp, par->which_io, info->fix.smem_start);
339
340	return 0;
341
342out_unmap_screen:
343	of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
344
345out_unmap_regs:
346	of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
347
348out_release_fb:
349	framebuffer_release(info);
350
351out_err:
352	return err;
353}
354
355static int bw2_remove(struct platform_device *op)
356{
357	struct fb_info *info = dev_get_drvdata(&op->dev);
358	struct bw2_par *par = info->par;
359
360	unregister_framebuffer(info);
361
362	of_iounmap(&op->resource[0], par->regs, sizeof(struct bw2_regs));
363	of_iounmap(&op->resource[0], info->screen_base, info->fix.smem_len);
364
365	framebuffer_release(info);
366
367	return 0;
368}
369
370static const struct of_device_id bw2_match[] = {
371	{
372		.name = "bwtwo",
373	},
374	{},
375};
376MODULE_DEVICE_TABLE(of, bw2_match);
377
378static struct platform_driver bw2_driver = {
379	.driver = {
380		.name = "bw2",
381		.of_match_table = bw2_match,
382	},
383	.probe		= bw2_probe,
384	.remove		= bw2_remove,
385};
386
387static int __init bw2_init(void)
388{
389	if (fb_get_options("bw2fb", NULL))
390		return -ENODEV;
391
392	return platform_driver_register(&bw2_driver);
393}
394
395static void __exit bw2_exit(void)
396{
397	platform_driver_unregister(&bw2_driver);
398}
399
400module_init(bw2_init);
401module_exit(bw2_exit);
402
403MODULE_DESCRIPTION("framebuffer driver for BWTWO chipsets");
404MODULE_AUTHOR("David S. Miller <davem@davemloft.net>");
405MODULE_VERSION("2.0");
406MODULE_LICENSE("GPL");
407