tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * HP300 Topcat framebuffer support (derived from macfb of all things)
3 * Phil Blundell <philb@gnu.org> 1998
4 * DIO-II, colour map and Catseye support by
5 * Kars de Jong <jongk@linux-m68k.org>, May 2004.
6 */
7
8#include <linux/module.h>
9#include <linux/kernel.h>
10#include <linux/sched.h>
11#include <linux/errno.h>
12#include <linux/string.h>
13#include <linux/mm.h>
14#include <linux/tty.h>
15#include <linux/slab.h>
16#include <linux/delay.h>
17#include <linux/init.h>
18#include <linux/fb.h>
19#include <linux/dio.h>
20
21#include <asm/io.h>
22#include <asm/uaccess.h>
23
24static struct fb_info fb_info = {
25 .fix = {
26 .id = "HP300 ",
27 .type = FB_TYPE_PACKED_PIXELS,
28 .visual = FB_VISUAL_PSEUDOCOLOR,
29 .accel = FB_ACCEL_NONE,
30 }
31};
32
33static unsigned long fb_regs;
34static unsigned char fb_bitmask;
35
36#define TC_NBLANK 0x4080
37#define TC_WEN 0x4088
38#define TC_REN 0x408c
39#define TC_FBEN 0x4090
40#define TC_PRR 0x40ea
41
42/* These defines match the X window system */
43#define RR_CLEAR 0x0
44#define RR_COPY 0x3
45#define RR_NOOP 0x5
46#define RR_XOR 0x6
47#define RR_INVERT 0xa
48#define RR_COPYINVERTED 0xc
49#define RR_SET 0xf
50
51/* blitter regs */
52#define BUSY 0x4044
53#define WMRR 0x40ef
54#define SOURCE_X 0x40f2
55#define SOURCE_Y 0x40f6
56#define DEST_X 0x40fa
57#define DEST_Y 0x40fe
58#define WHEIGHT 0x4106
59#define WWIDTH 0x4102
60#define WMOVE 0x409c
61
62static struct fb_var_screeninfo hpfb_defined = {
63 .red = {
64 .length = 8,
65 },
66 .green = {
67 .length = 8,
68 },
69 .blue = {
70 .length = 8,
71 },
72 .activate = FB_ACTIVATE_NOW,
73 .height = -1,
74 .width = -1,
75 .vmode = FB_VMODE_NONINTERLACED,
76};
77
78static int hpfb_setcolreg(unsigned regno, unsigned red, unsigned green,
79 unsigned blue, unsigned transp,
80 struct fb_info *info)
81{
82 /* use MSBs */
83 unsigned char _red =red>>8;
84 unsigned char _green=green>>8;
85 unsigned char _blue =blue>>8;
86 unsigned char _regno=regno;
87
88 /*
89 * Set a single color register. The values supplied are
90 * already rounded down to the hardware's capabilities
91 * (according to the entries in the `var' structure). Return
92 * != 0 for invalid regno.
93 */
94
95 if (regno >= info->cmap.len)
96 return 1;
97
98 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
99
100 out_be16(fb_regs + 0x60ba, 0xff);
101
102 out_be16(fb_regs + 0x60b2, _red);
103 out_be16(fb_regs + 0x60b4, _green);
104 out_be16(fb_regs + 0x60b6, _blue);
105 out_be16(fb_regs + 0x60b8, ~_regno);
106 out_be16(fb_regs + 0x60f0, 0xff);
107
108 udelay(100);
109
110 while (in_be16(fb_regs + 0x6002) & 0x4) udelay(1);
111 out_be16(fb_regs + 0x60b2, 0);
112 out_be16(fb_regs + 0x60b4, 0);
113 out_be16(fb_regs + 0x60b6, 0);
114 out_be16(fb_regs + 0x60b8, 0);
115
116 return 0;
117}
118
119/* 0 unblank, 1 blank, 2 no vsync, 3 no hsync, 4 off */
120
121static int hpfb_blank(int blank, struct fb_info *info)
122{
123 out_8(fb_regs + TC_NBLANK, (blank ? 0x00 : fb_bitmask));
124
125 return 0;
126}
127
128static void topcat_blit(int x0, int y0, int x1, int y1, int w, int h, int rr)
129{
130 if (rr >= 0) {
131 while (in_8(fb_regs + BUSY) & fb_bitmask)
132 ;
133 }
134 out_8(fb_regs + TC_FBEN, fb_bitmask);
135 if (rr >= 0) {
136 out_8(fb_regs + TC_WEN, fb_bitmask);
137 out_8(fb_regs + WMRR, rr);
138 }
139 out_be16(fb_regs + SOURCE_X, x0);
140 out_be16(fb_regs + SOURCE_Y, y0);
141 out_be16(fb_regs + DEST_X, x1);
142 out_be16(fb_regs + DEST_Y, y1);
143 out_be16(fb_regs + WWIDTH, w);
144 out_be16(fb_regs + WHEIGHT, h);
145 out_8(fb_regs + WMOVE, fb_bitmask);
146}
147
148static void hpfb_copyarea(struct fb_info *info, const struct fb_copyarea *area)
149{
150 topcat_blit(area->sx, area->sy, area->dx, area->dy, area->width, area->height, RR_COPY);
151}
152
153static void hpfb_fillrect(struct fb_info *p, const struct fb_fillrect *region)
154{
155 u8 clr;
156
157 clr = region->color & 0xff;
158
159 while (in_8(fb_regs + BUSY) & fb_bitmask)
160 ;
161
162 /* Foreground */
163 out_8(fb_regs + TC_WEN, fb_bitmask & clr);
164 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_SET : RR_INVERT));
165
166 /* Background */
167 out_8(fb_regs + TC_WEN, fb_bitmask & ~clr);
168 out_8(fb_regs + WMRR, (region->rop == ROP_COPY ? RR_CLEAR : RR_NOOP));
169
170 topcat_blit(region->dx, region->dy, region->dx, region->dy, region->width, region->height, -1);
171}
172
173static int hpfb_sync(struct fb_info *info)
174{
175 /*
176 * Since we also access the framebuffer directly, we have to wait
177 * until the block mover is finished
178 */
179 while (in_8(fb_regs + BUSY) & fb_bitmask)
180 ;
181
182 out_8(fb_regs + TC_WEN, fb_bitmask);
183 out_8(fb_regs + TC_PRR, RR_COPY);
184 out_8(fb_regs + TC_FBEN, fb_bitmask);
185
186 return 0;
187}
188
189static struct fb_ops hpfb_ops = {
190 .owner = THIS_MODULE,
191 .fb_setcolreg = hpfb_setcolreg,
192 .fb_blank = hpfb_blank,
193 .fb_fillrect = hpfb_fillrect,
194 .fb_copyarea = hpfb_copyarea,
195 .fb_imageblit = cfb_imageblit,
196 .fb_cursor = soft_cursor,
197 .fb_sync = hpfb_sync,
198};
199
200/* Common to all HP framebuffers */
201#define HPFB_FBWMSB 0x05 /* Frame buffer width */
202#define HPFB_FBWLSB 0x07
203#define HPFB_FBHMSB 0x09 /* Frame buffer height */
204#define HPFB_FBHLSB 0x0b
205#define HPFB_DWMSB 0x0d /* Display width */
206#define HPFB_DWLSB 0x0f
207#define HPFB_DHMSB 0x11 /* Display height */
208#define HPFB_DHLSB 0x13
209#define HPFB_NUMPLANES 0x5b /* Number of colour planes */
210#define HPFB_FBOMSB 0x5d /* Frame buffer offset */
211#define HPFB_FBOLSB 0x5f
212
213static int __init hpfb_init_one(unsigned long phys_base, unsigned long virt_base)
214{
215 unsigned long fboff, fb_width, fb_height, fb_start;
216
217 fb_regs = virt_base;
218 fboff = (in_8(fb_regs + HPFB_FBOMSB) << 8) | in_8(fb_regs + HPFB_FBOLSB);
219
220 fb_info.fix.smem_start = (in_8(fb_regs + fboff) << 16);
221
222 if (phys_base >= DIOII_BASE) {
223 fb_info.fix.smem_start += phys_base;
224 }
225
226 if (DIO_SECID(fb_regs) != DIO_ID2_TOPCAT) {
227 /* This is the magic incantation the HP X server uses to make Catseye boards work. */
228 while (in_be16(fb_regs+0x4800) & 1)
229 ;
230 out_be16(fb_regs+0x4800, 0); /* Catseye status */
231 out_be16(fb_regs+0x4510, 0); /* VB */
232 out_be16(fb_regs+0x4512, 0); /* TCNTRL */
233 out_be16(fb_regs+0x4514, 0); /* ACNTRL */
234 out_be16(fb_regs+0x4516, 0); /* PNCNTRL */
235 out_be16(fb_regs+0x4206, 0x90); /* RUG Command/Status */
236 out_be16(fb_regs+0x60a2, 0); /* Overlay Mask */
237 out_be16(fb_regs+0x60bc, 0); /* Ram Select */
238 }
239
240 /*
241 * Fill in the available video resolution
242 */
243 fb_width = (in_8(fb_regs + HPFB_FBWMSB) << 8) | in_8(fb_regs + HPFB_FBWLSB);
244 fb_info.fix.line_length = fb_width;
245 fb_height = (in_8(fb_regs + HPFB_FBHMSB) << 8) | in_8(fb_regs + HPFB_FBHLSB);
246 fb_info.fix.smem_len = fb_width * fb_height;
247 fb_start = (unsigned long)ioremap_writethrough(fb_info.fix.smem_start,
248 fb_info.fix.smem_len);
249 hpfb_defined.xres = (in_8(fb_regs + HPFB_DWMSB) << 8) | in_8(fb_regs + HPFB_DWLSB);
250 hpfb_defined.yres = (in_8(fb_regs + HPFB_DHMSB) << 8) | in_8(fb_regs + HPFB_DHLSB);
251 hpfb_defined.xres_virtual = hpfb_defined.xres;
252 hpfb_defined.yres_virtual = hpfb_defined.yres;
253 hpfb_defined.bits_per_pixel = in_8(fb_regs + HPFB_NUMPLANES);
254
255 printk(KERN_INFO "hpfb: framebuffer at 0x%lx, mapped to 0x%lx, size %dk\n",
256 fb_info.fix.smem_start, fb_start, fb_info.fix.smem_len/1024);
257 printk(KERN_INFO "hpfb: mode is %dx%dx%d, linelength=%d\n",
258 hpfb_defined.xres, hpfb_defined.yres, hpfb_defined.bits_per_pixel, fb_info.fix.line_length);
259
260 /*
261 * Give the hardware a bit of a prod and work out how many bits per
262 * pixel are supported.
263 */
264 out_8(fb_regs + TC_WEN, 0xff);
265 out_8(fb_regs + TC_PRR, RR_COPY);
266 out_8(fb_regs + TC_FBEN, 0xff);
267 out_8(fb_start, 0xff);
268 fb_bitmask = in_8(fb_start);
269 out_8(fb_start, 0);
270
271 /*
272 * Enable reading/writing of all the planes.
273 */
274 out_8(fb_regs + TC_WEN, fb_bitmask);
275 out_8(fb_regs + TC_PRR, RR_COPY);
276 out_8(fb_regs + TC_REN, fb_bitmask);
277 out_8(fb_regs + TC_FBEN, fb_bitmask);
278
279 /*
280 * Clear the screen.
281 */
282 topcat_blit(0, 0, 0, 0, fb_width, fb_height, RR_CLEAR);
283
284 /*
285 * Let there be consoles..
286 */
287 if (DIO_SECID(fb_regs) == DIO_ID2_TOPCAT)
288 strcat(fb_info.fix.id, "Topcat");
289 else
290 strcat(fb_info.fix.id, "Catseye");
291 fb_info.fbops = &hpfb_ops;
292 fb_info.flags = FBINFO_DEFAULT;
293 fb_info.var = hpfb_defined;
294 fb_info.screen_base = (char *)fb_start;
295
296 fb_alloc_cmap(&fb_info.cmap, 1 << hpfb_defined.bits_per_pixel, 0);
297
298 if (register_framebuffer(&fb_info) < 0) {
299 fb_dealloc_cmap(&fb_info.cmap);
300 return 1;
301 }
302
303 printk(KERN_INFO "fb%d: %s frame buffer device\n",
304 fb_info.node, fb_info.fix.id);
305
306 return 0;
307}
308
309/*
310 * Check that the secondary ID indicates that we have some hope of working with this
311 * framebuffer. The catseye boards are pretty much like topcats and we can muddle through.
312 */
313
314#define topcat_sid_ok(x) (((x) == DIO_ID2_LRCATSEYE) || ((x) == DIO_ID2_HRCCATSEYE) \
315 || ((x) == DIO_ID2_HRMCATSEYE) || ((x) == DIO_ID2_TOPCAT))
316
317/*
318 * Initialise the framebuffer
319 */
320static int __devinit hpfb_dio_probe(struct dio_dev * d, const struct dio_device_id * ent)
321{
322 unsigned long paddr, vaddr;
323
324 paddr = d->resource.start;
325 if (!request_mem_region(d->resource.start, d->resource.end - d->resource.start, d->name))
326 return -EBUSY;
327
328 if (d->scode >= DIOII_SCBASE) {
329 vaddr = (unsigned long)ioremap(paddr, d->resource.end - d->resource.start);
330 } else {
331 vaddr = paddr + DIO_VIRADDRBASE;
332 }
333 printk(KERN_INFO "Topcat found at DIO select code %d "
334 "(secondary id %02x)\n", d->scode, (d->id >> 8) & 0xff);
335 if (hpfb_init_one(paddr, vaddr)) {
336 if (d->scode >= DIOII_SCBASE)
337 iounmap((void *)vaddr);
338 return -ENOMEM;
339 }
340 return 0;
341}
342
343static void __devexit hpfb_remove_one(struct dio_dev *d)
344{
345 unregister_framebuffer(&fb_info);
346 if (d->scode >= DIOII_SCBASE)
347 iounmap((void *)fb_regs);
348 release_mem_region(d->resource.start, d->resource.end - d->resource.start);
349}
350
351static struct dio_device_id hpfb_dio_tbl[] = {
352 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_LRCATSEYE) },
353 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRCCATSEYE) },
354 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_HRMCATSEYE) },
355 { DIO_ENCODE_ID(DIO_ID_FBUFFER, DIO_ID2_TOPCAT) },
356 { 0 }
357};
358
359static struct dio_driver hpfb_driver = {
360 .name = "hpfb",
361 .id_table = hpfb_dio_tbl,
362 .probe = hpfb_dio_probe,
363 .remove = __devexit_p(hpfb_remove_one),
364};
365
366int __init hpfb_init(void)
367{
368 unsigned int sid;
369 mm_segment_t fs;
370 unsigned char i;
371 int err;
372
373 /* Topcats can be on the internal IO bus or real DIO devices.
374 * The internal variant sits at 0x560000; it has primary
375 * and secondary ID registers just like the DIO version.
376 * So we merge the two detection routines.
377 *
378 * Perhaps this #define should be in a global header file:
379 * I believe it's common to all internal fbs, not just topcat.
380 */
381#define INTFBVADDR 0xf0560000
382#define INTFBPADDR 0x560000
383
384 if (!MACH_IS_HP300)
385 return -ENXIO;
386
387 if (fb_get_options("hpfb", NULL))
388 return -ENODEV;
389
390 dio_module_init(&hpfb_driver);
391
392 fs = get_fs();
393 set_fs(KERNEL_DS);
394 err = get_user(i, (unsigned char *)INTFBVADDR + DIO_IDOFF);
395 set_fs(fs);
396
397 if (!err && (i == DIO_ID_FBUFFER) && topcat_sid_ok(sid = DIO_SECID(INTFBVADDR))) {
398 if (!request_mem_region(INTFBPADDR, DIO_DEVSIZE, "Internal Topcat"))
399 return -EBUSY;
400 printk(KERN_INFO "Internal Topcat found (secondary id %02x)\n", sid);
401 if (hpfb_init_one(INTFBPADDR, INTFBVADDR)) {
402 return -ENOMEM;
403 }
404 }
405 return 0;
406}
407
408void __exit hpfb_cleanup_module(void)
409{
410 dio_unregister_driver(&hpfb_driver);
411}
412
413module_init(hpfb_init);
414module_exit(hpfb_cleanup_module);
415
416MODULE_LICENSE("GPL");