1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  *	HP300 Topcat framebuffer support (derived from macfb of all things)
4  *	Phil Blundell <philb@gnu.org> 1998
5  *	DIO-II, colour map and Catseye support by
6  *	Kars de Jong <jongk@linux-m68k.org>, May 2004.
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/mm.h>
14 #include <linux/delay.h>
15 #include <linux/init.h>
16 #include <linux/fb.h>
17 #include <linux/dio.h>
18 
19 #include <asm/io.h>
20 #include <linux/uaccess.h>
21 
22 static struct fb_info fb_info = {
23 	.fix = {
24 		.id		= "HP300 ",
25 		.type		= FB_TYPE_PACKED_PIXELS,
26 		.visual		= FB_VISUAL_PSEUDOCOLOR,
27 		.accel		= FB_ACCEL_NONE,
28 	}
29 };
30 
31 static unsigned long fb_regs;
32 static unsigned char fb_bitmask;
33 
34 #define TC_NBLANK	0x4080
35 #define TC_WEN		0x4088
36 #define TC_REN		0x408c
37 #define TC_FBEN		0x4090
38 #define TC_PRR		0x40ea
39 
40 /* These defines match the X window system */
41 #define RR_CLEAR	0x0
42 #define RR_COPY		0x3
43 #define RR_NOOP		0x5
44 #define RR_XOR		0x6
45 #define RR_INVERT	0xa
46 #define RR_COPYINVERTED 0xc
47 #define RR_SET		0xf
48 
49 /* blitter regs */
50 #define BUSY		0x4044
51 #define WMRR		0x40ef
52 #define SOURCE_X	0x40f2
53 #define SOURCE_Y	0x40f6
54 #define DEST_X		0x40fa
55 #define DEST_Y		0x40fe
56 #define WHEIGHT		0x4106
57 #define WWIDTH		0x4102
58 #define WMOVE		0x409c
59 
60 static struct fb_var_screeninfo hpfb_defined = {
61 	.red		= {
62 		.length = 8,
63 	},
64 	.green		= {
65 		.length = 8,
66 	},
67 	.blue		= {
68 		.length = 8,
69 	},
70 	.activate	= FB_ACTIVATE_NOW,
71 	.height		= -1,
72 	.width		= -1,
73 	.vmode		= FB_VMODE_NONINTERLACED,
74 };
75 
hpfb_setcolreg(unsigned regno,unsigned red,unsigned green,unsigned blue,unsigned transp,struct fb_info * info)76 static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
77 			  unsigned blue, unsigned transp,
78 			  struct fb_info *info)
79 {
80 	/* use MSBs */
81 	unsigned char _red  =red>>8;
82 	unsigned char _green=green>>8;
83 	unsigned char _blue =blue>>8;
84 	unsigned char _regno=regno;
85 
86 	/*
87 	 *  Set a single color register. The values supplied are
88 	 *  already rounded down to the hardware's capabilities
89 	 *  (according to the entries in the `var' structure). Return
90 	 *  != 0 for invalid regno.
91 	 */
92 
93 	if (regno >= info->cmap.len)
94 		return 1;
95 
96 	while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
97 
98 	out_be16(fb_regs + 0x60ba, 0xff);
99 
100 	out_be16(fb_regs + 0x60b2, _red);
101 	out_be16(fb_regs + 0x60b4, _green);
102 	out_be16(fb_regs + 0x60b6, _blue);
103 	out_be16(fb_regs + 0x60b8, ~_regno);
104 	out_be16(fb_regs + 0x60f0, 0xff);
105 
106 	udelay(100);
107 
108 	while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
109 	out_be16(fb_regs + 0x60b2, 0);
110 	out_be16(fb_regs + 0x60b4, 0);
111 	out_be16(fb_regs + 0x60b6, 0);
112 	out_be16(fb_regs + 0x60b8, 0);
113 
114 	return 0;
115 }
116 
117 /* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
118 
hpfb_blank(int blank,struct fb_info * info)119 static int hpfb_blank(int blank, struct fb_info *info)
120 {
121 	out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
122 
123 	return 0;
124 }
125 
topcat_blit(int x0,int y0,int x1,int y1,int w,int h,int rr)126 static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
127 {
128 	if (rr >= 0) {
129 		while (in_8(fb_regs + BUSY) & fb_bitmask)
130 			;
131 	}
132 	out_8(fb_regs + TC_FBEN, fb_bitmask);
133 	if (rr >= 0) {
134 		out_8(fb_regs + TC_WEN, fb_bitmask);
135 		out_8(fb_regs + WMRR, rr);
136 	}
137 	out_be16(fb_regs + SOURCE_X, x0);
138 	out_be16(fb_regs + SOURCE_Y, y0);
139 	out_be16(fb_regs + DEST_X, x1);
140 	out_be16(fb_regs + DEST_Y, y1);
141 	out_be16(fb_regs + WWIDTH, w);
142 	out_be16(fb_regs + WHEIGHT, h);
143 	out_8(fb_regs + WMOVE, fb_bitmask);
144 }
145 
hpfb_copyarea(struct fb_info * info,const struct fb_copyarea * area)146 static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
147 {
148 	topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
149 }
150 
hpfb_fillrect(struct fb_info * p,const struct fb_fillrect * region)151 static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
152 {
153 	u8 clr;
154 
155 	clr = region->color & 0xff;
156 
157 	while (in_8(fb_regs + BUSY) & fb_bitmask)
158 		;
159 
160 	/* Foreground */
161 	out_8(fb_regs + TC_WEN, fb_bitmask & clr);
162 	out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
163 
164 	/* Background */
165 	out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
166 	out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
167 
168 	topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
169 }
170 
hpfb_sync(struct fb_info * info)171 static int hpfb_sync(struct fb_info *info)
172 {
173 	/*
174 	 * Since we also access the framebuffer directly, we have to wait
175 	 * until the block mover is finished
176 	 */
177 	while (in_8(fb_regs + BUSY) & fb_bitmask)
178 		;
179 
180 	out_8(fb_regs + TC_WEN, fb_bitmask);
181 	out_8(fb_regs + TC_PRR, RR_COPY);
182 	out_8(fb_regs + TC_FBEN, fb_bitmask);
183 
184 	return 0;
185 }
186 
187 static const struct fb_ops hpfb_ops = {
188 	.owner		= THIS_MODULE,
189 	.fb_setcolreg	= hpfb_setcolreg,
190 	.fb_blank	= hpfb_blank,
191 	.fb_fillrect	= hpfb_fillrect,
192 	.fb_copyarea	= hpfb_copyarea,
193 	.fb_imageblit	= cfb_imageblit,
194 	.fb_sync	= hpfb_sync,
195 };
196 
197 /* Common to all HP framebuffers */
198 #define HPFB_FBWMSB	0x05	/* Frame buffer width 		*/
199 #define HPFB_FBWLSB	0x07
200 #define HPFB_FBHMSB	0x09	/* Frame buffer height		*/
201 #define HPFB_FBHLSB	0x0b
202 #define HPFB_DWMSB	0x0d	/* Display width		*/
203 #define HPFB_DWLSB	0x0f
204 #define HPFB_DHMSB	0x11	/* Display height		*/
205 #define HPFB_DHLSB	0x13
206 #define HPFB_NUMPLANES	0x5b	/* Number of colour planes	*/
207 #define HPFB_FBOMSB	0x5d	/* Frame buffer offset		*/
208 #define HPFB_FBOLSB	0x5f
209 
hpfb_init_one(unsigned long phys_base,unsigned long virt_base)210 static int hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
211 {
212 	unsigned long fboff, fb_width, fb_height, fb_start;
213 	int ret;
214 
215 	fb_regs = virt_base;
216 	fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
217 
218 	fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
219 
220 	if (phys_base >= DIOII_BASE) {
221 		fb_info.fix.smem_start += phys_base;
222 	}
223 
224 	if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
225 		/* This is the magic incantation the HP X server uses to make Catseye boards work. */
226 		while (in_be16(fb_regs+0x4800) & 1)
227 			;
228 		out_be16(fb_regs+0x4800, 0);	/* Catseye status */
229 		out_be16(fb_regs+0x4510, 0);	/* VB */
230 		out_be16(fb_regs+0x4512, 0);	/* TCNTRL */
231 		out_be16(fb_regs+0x4514, 0);	/* ACNTRL */
232 		out_be16(fb_regs+0x4516, 0);	/* PNCNTRL */
233 		out_be16(fb_regs+0x4206, 0x90);	/* RUG Command/Status */
234 		out_be16(fb_regs+0x60a2, 0);	/* Overlay Mask */
235 		out_be16(fb_regs+0x60bc, 0);	/* Ram Select */
236 	}
237 
238 	/*
239 	 *	Fill in the available video resolution
240 	 */
241 	fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
242 	fb_info.fix.line_length = fb_width;
243 	fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
244 	fb_info.fix.smem_len = fb_width * fb_height;
245 	fb_start = (unsigned long)ioremap_wt(fb_info.fix.smem_start,
246 					     fb_info.fix.smem_len);
247 	hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
248 	hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
249 	hpfb_defined.xres_virtual = hpfb_defined.xres;
250 	hpfb_defined.yres_virtual = hpfb_defined.yres;
251 	hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
252 
253 	printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
254 	       fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
255 	printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
256 	       hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
257 
258 	/*
259 	 *	Give the hardware a bit of a prod and work out how many bits per
260 	 *	pixel are supported.
261 	 */
262 	out_8(fb_regs + TC_WEN, 0xff);
263 	out_8(fb_regs + TC_PRR, RR_COPY);
264 	out_8(fb_regs + TC_FBEN, 0xff);
265 	out_8(fb_start, 0xff);
266 	fb_bitmask = in_8(fb_start);
267 	out_8(fb_start, 0);
268 
269 	/*
270 	 *	Enable reading/writing of all the planes.
271 	 */
272 	out_8(fb_regs + TC_WEN, fb_bitmask);
273 	out_8(fb_regs + TC_PRR, RR_COPY);
274 	out_8(fb_regs + TC_REN, fb_bitmask);
275 	out_8(fb_regs + TC_FBEN, fb_bitmask);
276 
277 	/*
278 	 *	Clear the screen.
279 	 */
280 	topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
281 
282 	/*
283 	 *	Let there be consoles..
284 	 */
285 	if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
286 		strcat(fb_info.fix.id, "Topcat");
287 	else
288 		strcat(fb_info.fix.id, "Catseye");
289 	fb_info.fbops = &hpfb_ops;
290 	fb_info.flags = FBINFO_DEFAULT;
291 	fb_info.var   = hpfb_defined;
292 	fb_info.screen_base = (char *)fb_start;
293 
294 	ret = fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
295 	if (ret < 0)
296 		goto unmap_screen_base;
297 
298 	ret = register_framebuffer(&fb_info);
299 	if (ret < 0)
300 		goto dealloc_cmap;
301 
302 	fb_info(&fb_info, "%s frame buffer device\n", fb_info.fix.id);
303 
304 	return 0;
305 
306 dealloc_cmap:
307 	fb_dealloc_cmap(&fb_info.cmap);
308 
309 unmap_screen_base:
310 	if (fb_info.screen_base) {
311 		iounmap(fb_info.screen_base);
312 		fb_info.screen_base = NULL;
313 	}
314 
315 	return ret;
316 }
317 
318 /*
319  * Check that the secondary ID indicates that we have some hope of working with this
320  * framebuffer.  The catseye boards are pretty much like topcats and we can muddle through.
321  */
322 
323 #define topcat_sid_ok(x)  (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE)    \
324 			   || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
325 
326 /*
327  * Initialise the framebuffer
328  */
hpfb_dio_probe(struct dio_dev * d,const struct dio_device_id * ent)329 static int hpfb_dio_probe(struct dio_dev *d, const struct dio_device_id *ent)
330 {
331 	unsigned long paddr, vaddr;
332 
333 	paddr = d->resource.start;
334 	if (!request_mem_region(d->resource.start, resource_size(&d->resource), d->name))
335                 return -EBUSY;
336 
337 	if (d->scode >= DIOII_SCBASE) {
338 		vaddr = (unsigned long)ioremap(paddr, resource_size(&d->resource));
339 	} else {
340 		vaddr = paddr + DIO_VIRADDRBASE;
341 	}
342 	printk(KERN_INFO "Topcat found at DIO select code %d "
343 	       "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
344 	if (hpfb_init_one(paddr, vaddr)) {
345 		if (d->scode >= DIOII_SCBASE)
346 			iounmap((void *)vaddr);
347 		return -ENOMEM;
348 	}
349 	return 0;
350 }
351 
hpfb_remove_one(struct dio_dev * d)352 static void hpfb_remove_one(struct dio_dev *d)
353 {
354 	unregister_framebuffer(&fb_info);
355 	if (d->scode >= DIOII_SCBASE)
356 		iounmap((void *)fb_regs);
357 	release_mem_region(d->resource.start, resource_size(&d->resource));
358 	fb_dealloc_cmap(&fb_info.cmap);
359 	if (fb_info.screen_base)
360 		iounmap(fb_info.screen_base);
361 }
362 
363 static struct dio_device_id hpfb_dio_tbl[] = {
364     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
365     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
366     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
367     { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
368     { 0 }
369 };
370 
371 static struct dio_driver hpfb_driver = {
372     .name      = "hpfb",
373     .id_table  = hpfb_dio_tbl,
374     .probe     = hpfb_dio_probe,
375     .remove    = hpfb_remove_one,
376 };
377 
hpfb_init(void)378 int __init hpfb_init(void)
379 {
380 	unsigned int sid;
381 	unsigned char i;
382 	int err;
383 
384 	/* Topcats can be on the internal IO bus or real DIO devices.
385 	 * The internal variant sits at 0x560000; it has primary
386 	 * and secondary ID registers just like the DIO version.
387 	 * So we merge the two detection routines.
388 	 *
389 	 * Perhaps this #define should be in a global header file:
390 	 * I believe it's common to all internal fbs, not just topcat.
391 	 */
392 #define INTFBVADDR 0xf0560000
393 #define INTFBPADDR 0x560000
394 
395 	if (!MACH_IS_HP300)
396 		return -ENODEV;
397 
398 	if (fb_get_options("hpfb", NULL))
399 		return -ENODEV;
400 
401 	err = dio_register_driver(&hpfb_driver);
402 	if (err)
403 		return err;
404 
405 	err = copy_from_kernel_nofault(&i, (unsigned char *)INTFBVADDR + DIO_IDOFF, 1);
406 
407 	if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
408 		if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
409 			return -EBUSY;
410 		printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
411 		if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
412 			return -ENOMEM;
413 		}
414 	}
415 	return 0;
416 }
417 
hpfb_cleanup_module(void)418 void __exit hpfb_cleanup_module(void)
419 {
420 	dio_unregister_driver(&hpfb_driver);
421 }
422 
423 module_init(hpfb_init);
424 module_exit(hpfb_cleanup_module);
425 
426 MODULE_LICENSE("GPL");
427