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[linux-2.6/mini2440.git] / drivers / video / gxt4500.c
blob564557792bed6e616d590b8c49a1d28f3719f442
1 /*
2 * Frame buffer device for IBM GXT4500P and GXT6000P display adaptors
3 *
4 * Copyright (C) 2006 Paul Mackerras, IBM Corp. <paulus@samba.org>
5 */
6
7 #include <linux/kernel.h>
8 #include <linux/module.h>
9 #include <linux/fb.h>
10 #include <linux/console.h>
11 #include <linux/pci.h>
12 #include <linux/pci_ids.h>
13 #include <linux/delay.h>
14 #include <linux/string.h>
15
16 #define PCI_DEVICE_ID_IBM_GXT4500P 0x21c
17 #define PCI_DEVICE_ID_IBM_GXT6000P 0x170
18
19 /* GXT4500P registers */
20
21 /* Registers in PCI config space */
22 #define CFG_ENDIAN0 0x40
23
24 /* Misc control/status registers */
25 #define STATUS 0x1000
26 #define CTRL_REG0 0x1004
27 #define CR0_HALT_DMA 0x4
28 #define CR0_RASTER_RESET 0x8
29 #define CR0_GEOM_RESET 0x10
30 #define CR0_MEM_CTRLER_RESET 0x20
31
32 /* Framebuffer control registers */
33 #define FB_AB_CTRL 0x1100
34 #define FB_CD_CTRL 0x1104
35 #define FB_WID_CTRL 0x1108
36 #define FB_Z_CTRL 0x110c
37 #define FB_VGA_CTRL 0x1110
38 #define REFRESH_AB_CTRL 0x1114
39 #define REFRESH_CD_CTRL 0x1118
40 #define FB_OVL_CTRL 0x111c
41 #define FB_CTRL_TYPE 0x80000000
42 #define FB_CTRL_WIDTH_MASK 0x007f0000
43 #define FB_CTRL_WIDTH_SHIFT 16
44 #define FB_CTRL_START_SEG_MASK 0x00003fff
45
46 #define REFRESH_START 0x1098
47 #define REFRESH_SIZE 0x109c
48
49 /* "Direct" framebuffer access registers */
50 #define DFA_FB_A 0x11e0
51 #define DFA_FB_B 0x11e4
52 #define DFA_FB_C 0x11e8
53 #define DFA_FB_D 0x11ec
54 #define DFA_FB_ENABLE 0x80000000
55 #define DFA_FB_BASE_MASK 0x03f00000
56 #define DFA_FB_STRIDE_1k 0x00000000
57 #define DFA_FB_STRIDE_2k 0x00000010
58 #define DFA_FB_STRIDE_4k 0x00000020
59 #define DFA_PIX_8BIT 0x00000000
60 #define DFA_PIX_16BIT_565 0x00000001
61 #define DFA_PIX_16BIT_1555 0x00000002
62 #define DFA_PIX_24BIT 0x00000004
63 #define DFA_PIX_32BIT 0x00000005
64
65 /* maps DFA_PIX_* to pixel size in bytes */
66 static const unsigned char pixsize[] = {
67 1, 2, 2, 2, 4, 4
68 };
69
70 /* Display timing generator registers */
71 #define DTG_CONTROL 0x1900
72 #define DTG_CTL_SCREEN_REFRESH 2
73 #define DTG_CTL_ENABLE 1
74 #define DTG_HORIZ_EXTENT 0x1904
75 #define DTG_HORIZ_DISPLAY 0x1908
76 #define DTG_HSYNC_START 0x190c
77 #define DTG_HSYNC_END 0x1910
78 #define DTG_HSYNC_END_COMP 0x1914
79 #define DTG_VERT_EXTENT 0x1918
80 #define DTG_VERT_DISPLAY 0x191c
81 #define DTG_VSYNC_START 0x1920
82 #define DTG_VSYNC_END 0x1924
83 #define DTG_VERT_SHORT 0x1928
84
85 /* PLL/RAMDAC registers */
86 #define DISP_CTL 0x402c
87 #define DISP_CTL_OFF 2
88 #define SYNC_CTL 0x4034
89 #define SYNC_CTL_SYNC_ON_RGB 1
90 #define SYNC_CTL_SYNC_OFF 2
91 #define SYNC_CTL_HSYNC_INV 8
92 #define SYNC_CTL_VSYNC_INV 0x10
93 #define SYNC_CTL_HSYNC_OFF 0x20
94 #define SYNC_CTL_VSYNC_OFF 0x40
95
96 #define PLL_M 0x4040
97 #define PLL_N 0x4044
98 #define PLL_POSTDIV 0x4048
99 #define PLL_C 0x404c
100
101 /* Hardware cursor */
102 #define CURSOR_X 0x4078
103 #define CURSOR_Y 0x407c
104 #define CURSOR_HOTSPOT 0x4080
105 #define CURSOR_MODE 0x4084
106 #define CURSOR_MODE_OFF 0
107 #define CURSOR_MODE_4BPP 1
108 #define CURSOR_PIXMAP 0x5000
109 #define CURSOR_CMAP 0x7400
110
111 /* Window attribute table */
112 #define WAT_FMT 0x4100
113 #define WAT_FMT_24BIT 0
114 #define WAT_FMT_16BIT_565 1
115 #define WAT_FMT_16BIT_1555 2
116 #define WAT_FMT_32BIT 3 /* 0 vs. 3 is a guess */
117 #define WAT_FMT_8BIT_332 9
118 #define WAT_FMT_8BIT 0xa
119 #define WAT_FMT_NO_CMAP 4 /* ORd in to other values */
120 #define WAT_CMAP_OFFSET 0x4104 /* 4-bit value gets << 6 */
121 #define WAT_CTRL 0x4108
122 #define WAT_CTRL_SEL_B 1 /* select B buffer if 1 */
123 #define WAT_CTRL_NO_INC 2
124 #define WAT_GAMMA_CTRL 0x410c
125 #define WAT_GAMMA_DISABLE 1 /* disables gamma cmap */
126 #define WAT_OVL_CTRL 0x430c /* controls overlay */
127
128 /* Indexed by DFA_PIX_* values */
129 static const unsigned char watfmt[] = {
130 WAT_FMT_8BIT, WAT_FMT_16BIT_565, WAT_FMT_16BIT_1555, 0,
131 WAT_FMT_24BIT, WAT_FMT_32BIT
132 };
133
134 /* Colormap array; 1k entries of 4 bytes each */
135 #define CMAP 0x6000
136
137 #define readreg(par, reg) readl((par)->regs + (reg))
138 #define writereg(par, reg, val) writel((val), (par)->regs + (reg))
139
140 struct gxt4500_par {
141 void __iomem *regs;
142
143 int pixfmt; /* pixel format, see DFA_PIX_* values */
144
145 /* PLL parameters */
146 int refclk_ps; /* ref clock period in picoseconds */
147 int pll_m; /* ref clock divisor */
148 int pll_n; /* VCO divisor */
149 int pll_pd1; /* first post-divisor */
150 int pll_pd2; /* second post-divisor */
151
152 u32 pseudo_palette[16]; /* used in color blits */
153 };
154
155 /* mode requested by user */
156 static char *mode_option;
157
158 /* default mode: 1280x1024 @ 60 Hz, 8 bpp */
159 static const struct fb_videomode defaultmode __devinitdata = {
160 .refresh = 60,
161 .xres = 1280,
162 .yres = 1024,
163 .pixclock = 9295,
164 .left_margin = 248,
165 .right_margin = 48,
166 .upper_margin = 38,
167 .lower_margin = 1,
168 .hsync_len = 112,
169 .vsync_len = 3,
170 .vmode = FB_VMODE_NONINTERLACED
171 };
172
173 /* List of supported cards */
174 enum gxt_cards {
175 GXT4500P,
176 GXT6000P
177 };
178
179 /* Card-specific information */
180 static const struct cardinfo {
181 int refclk_ps; /* period of PLL reference clock in ps */
182 const char *cardname;
183 } cardinfo[] = {
184 [GXT4500P] = { .refclk_ps = 9259, .cardname = "IBM GXT4500P" },
185 [GXT6000P] = { .refclk_ps = 40000, .cardname = "IBM GXT6000P" },
186 };
187
188 /*
189 * The refclk and VCO dividers appear to use a linear feedback shift
190 * register, which gets reloaded when it reaches a terminal value, at
191 * which point the divider output is toggled. Thus one can obtain
192 * whatever divisor is required by putting the appropriate value into
193 * the reload register. For a divisor of N, one puts the value from
194 * the LFSR sequence that comes N-1 places before the terminal value
195 * into the reload register.
196 */
197
198 static const unsigned char mdivtab[] = {
199 /* 1 */ 0x3f, 0x00, 0x20, 0x10, 0x28, 0x14, 0x2a, 0x15, 0x0a,
200 /* 10 */ 0x25, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x09, 0x04, 0x22, 0x11,
201 /* 20 */ 0x08, 0x24, 0x12, 0x29, 0x34, 0x1a, 0x2d, 0x36, 0x1b, 0x0d,
202 /* 30 */ 0x06, 0x23, 0x31, 0x38, 0x1c, 0x2e, 0x17, 0x0b, 0x05, 0x02,
203 /* 40 */ 0x21, 0x30, 0x18, 0x2c, 0x16, 0x2b, 0x35, 0x3a, 0x1d, 0x0e,
204 /* 50 */ 0x27, 0x33, 0x39, 0x3c, 0x1e, 0x2f, 0x37, 0x3b, 0x3d, 0x3e,
205 /* 60 */ 0x1f, 0x0f, 0x07, 0x03, 0x01,
206 };
207
208 static const unsigned char ndivtab[] = {
209 /* 2 */ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x78, 0xbc, 0x5e,
210 /* 10 */ 0x2f, 0x17, 0x0b, 0x85, 0xc2, 0xe1, 0x70, 0x38, 0x9c, 0x4e,
211 /* 20 */ 0xa7, 0xd3, 0xe9, 0xf4, 0xfa, 0xfd, 0xfe, 0x7f, 0xbf, 0xdf,
212 /* 30 */ 0xef, 0x77, 0x3b, 0x1d, 0x8e, 0xc7, 0xe3, 0x71, 0xb8, 0xdc,
213 /* 40 */ 0x6e, 0xb7, 0x5b, 0x2d, 0x16, 0x8b, 0xc5, 0xe2, 0xf1, 0xf8,
214 /* 50 */ 0xfc, 0x7e, 0x3f, 0x9f, 0xcf, 0x67, 0xb3, 0xd9, 0x6c, 0xb6,
215 /* 60 */ 0xdb, 0x6d, 0x36, 0x9b, 0x4d, 0x26, 0x13, 0x89, 0xc4, 0x62,
216 /* 70 */ 0xb1, 0xd8, 0xec, 0xf6, 0xfb, 0x7d, 0xbe, 0x5f, 0xaf, 0x57,
217 /* 80 */ 0x2b, 0x95, 0x4a, 0x25, 0x92, 0x49, 0xa4, 0x52, 0x29, 0x94,
218 /* 90 */ 0xca, 0x65, 0xb2, 0x59, 0x2c, 0x96, 0xcb, 0xe5, 0xf2, 0x79,
219 /* 100 */ 0x3c, 0x1e, 0x0f, 0x07, 0x83, 0x41, 0x20, 0x90, 0x48, 0x24,
220 /* 110 */ 0x12, 0x09, 0x84, 0x42, 0xa1, 0x50, 0x28, 0x14, 0x8a, 0x45,
221 /* 120 */ 0xa2, 0xd1, 0xe8, 0x74, 0xba, 0xdd, 0xee, 0xf7, 0x7b, 0x3d,
222 /* 130 */ 0x9e, 0x4f, 0x27, 0x93, 0xc9, 0xe4, 0x72, 0x39, 0x1c, 0x0e,
223 /* 140 */ 0x87, 0xc3, 0x61, 0x30, 0x18, 0x8c, 0xc6, 0x63, 0x31, 0x98,
224 /* 150 */ 0xcc, 0xe6, 0x73, 0xb9, 0x5c, 0x2e, 0x97, 0x4b, 0xa5, 0xd2,
225 /* 160 */ 0x69,
226 };
227
228 static int calc_pll(int period_ps, struct gxt4500_par *par)
229 {
230 int m, n, pdiv1, pdiv2, postdiv;
231 int pll_period, best_error, t, intf;
232
233 /* only deal with range 5MHz - 300MHz */
234 if (period_ps < 3333 || period_ps > 200000)
235 return -1;
236
237 best_error = 1000000;
238 for (pdiv1 = 1; pdiv1 <= 8; ++pdiv1) {
239 for (pdiv2 = 1; pdiv2 <= pdiv1; ++pdiv2) {
240 postdiv = pdiv1 * pdiv2;
241 pll_period = DIV_ROUND_UP(period_ps, postdiv);
242 /* keep pll in range 350..600 MHz */
243 if (pll_period < 1666 || pll_period > 2857)
244 continue;
245 for (m = 1; m <= 64; ++m) {
246 intf = m * par->refclk_ps;
247 if (intf > 500000)
248 break;
249 n = intf * postdiv / period_ps;
250 if (n < 3 || n > 160)
251 continue;
252 t = par->refclk_ps * m * postdiv / n;
253 t -= period_ps;
254 if (t >= 0 && t < best_error) {
255 par->pll_m = m;
256 par->pll_n = n;
257 par->pll_pd1 = pdiv1;
258 par->pll_pd2 = pdiv2;
259 best_error = t;
260 }
261 }
262 }
263 }
264 if (best_error == 1000000)
265 return -1;
266 return 0;
267 }
268
269 static int calc_pixclock(struct gxt4500_par *par)
270 {
271 return par->refclk_ps * par->pll_m * par->pll_pd1 * par->pll_pd2
272 / par->pll_n;
273 }
274
275 static int gxt4500_var_to_par(struct fb_var_screeninfo *var,
276 struct gxt4500_par *par)
277 {
278 if (var->xres + var->xoffset > var->xres_virtual ||
279 var->yres + var->yoffset > var->yres_virtual ||
280 var->xres_virtual > 4096)
281 return -EINVAL;
282 if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
283 return -EINVAL;
284
285 if (calc_pll(var->pixclock, par) < 0)
286 return -EINVAL;
287
288 switch (var->bits_per_pixel) {
289 case 32:
290 if (var->transp.length)
291 par->pixfmt = DFA_PIX_32BIT;
292 else
293 par->pixfmt = DFA_PIX_24BIT;
294 break;
295 case 24:
296 par->pixfmt = DFA_PIX_24BIT;
297 break;
298 case 16:
299 if (var->green.length == 5)
300 par->pixfmt = DFA_PIX_16BIT_1555;
301 else
302 par->pixfmt = DFA_PIX_16BIT_565;
303 break;
304 case 8:
305 par->pixfmt = DFA_PIX_8BIT;
306 break;
307 default:
308 return -EINVAL;
309 }
310
311 return 0;
312 }
313
314 static const struct fb_bitfield eightbits = {0, 8};
315 static const struct fb_bitfield nobits = {0, 0};
316
317 static void gxt4500_unpack_pixfmt(struct fb_var_screeninfo *var,
318 int pixfmt)
319 {
320 var->bits_per_pixel = pixsize[pixfmt] * 8;
321 var->red = eightbits;
322 var->green = eightbits;
323 var->blue = eightbits;
324 var->transp = nobits;
325
326 switch (pixfmt) {
327 case DFA_PIX_16BIT_565:
328 var->red.length = 5;
329 var->green.length = 6;
330 var->blue.length = 5;
331 break;
332 case DFA_PIX_16BIT_1555:
333 var->red.length = 5;
334 var->green.length = 5;
335 var->blue.length = 5;
336 var->transp.length = 1;
337 break;
338 case DFA_PIX_32BIT:
339 var->transp.length = 8;
340 break;
341 }
342 if (pixfmt != DFA_PIX_8BIT) {
343 var->green.offset = var->red.length;
344 var->blue.offset = var->green.offset + var->green.length;
345 if (var->transp.length)
346 var->transp.offset =
347 var->blue.offset + var->blue.length;
348 }
349 }
350
351 static int gxt4500_check_var(struct fb_var_screeninfo *var,
352 struct fb_info *info)
353 {
354 struct gxt4500_par par;
355 int err;
356
357 par = *(struct gxt4500_par *)info->par;
358 err = gxt4500_var_to_par(var, &par);
359 if (!err) {
360 var->pixclock = calc_pixclock(&par);
361 gxt4500_unpack_pixfmt(var, par.pixfmt);
362 }
363 return err;
364 }
365
366 static int gxt4500_set_par(struct fb_info *info)
367 {
368 struct gxt4500_par *par = info->par;
369 struct fb_var_screeninfo *var = &info->var;
370 int err;
371 u32 ctrlreg, tmp;
372 unsigned int dfa_ctl, pixfmt, stride;
373 unsigned int wid_tiles, i;
374 unsigned int prefetch_pix, htot;
375 struct gxt4500_par save_par;
376
377 save_par = *par;
378 err = gxt4500_var_to_par(var, par);
379 if (err) {
380 *par = save_par;
381 return err;
382 }
383
384 /* turn off DTG for now */
385 ctrlreg = readreg(par, DTG_CONTROL);
386 ctrlreg &= ~(DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH);
387 writereg(par, DTG_CONTROL, ctrlreg);
388
389 /* set PLL registers */
390 tmp = readreg(par, PLL_C) & ~0x7f;
391 if (par->pll_n < 38)
392 tmp |= 0x29;
393 if (par->pll_n < 69)
394 tmp |= 0x35;
395 else if (par->pll_n < 100)
396 tmp |= 0x76;
397 else
398 tmp |= 0x7e;
399 writereg(par, PLL_C, tmp);
400 writereg(par, PLL_M, mdivtab[par->pll_m - 1]);
401 writereg(par, PLL_N, ndivtab[par->pll_n - 2]);
402 tmp = ((8 - par->pll_pd2) << 3) | (8 - par->pll_pd1);
403 if (par->pll_pd1 == 8 || par->pll_pd2 == 8) {
404 /* work around erratum */
405 writereg(par, PLL_POSTDIV, tmp | 0x9);
406 udelay(1);
407 }
408 writereg(par, PLL_POSTDIV, tmp);
409 msleep(20);
410
411 /* turn off hardware cursor */
412 writereg(par, CURSOR_MODE, CURSOR_MODE_OFF);
413
414 /* reset raster engine */
415 writereg(par, CTRL_REG0, CR0_RASTER_RESET | (CR0_RASTER_RESET << 16));
416 udelay(10);
417 writereg(par, CTRL_REG0, CR0_RASTER_RESET << 16);
418
419 /* set display timing generator registers */
420 htot = var->xres + var->left_margin + var->right_margin +
421 var->hsync_len;
422 writereg(par, DTG_HORIZ_EXTENT, htot - 1);
423 writereg(par, DTG_HORIZ_DISPLAY, var->xres - 1);
424 writereg(par, DTG_HSYNC_START, var->xres + var->right_margin - 1);
425 writereg(par, DTG_HSYNC_END,
426 var->xres + var->right_margin + var->hsync_len - 1);
427 writereg(par, DTG_HSYNC_END_COMP,
428 var->xres + var->right_margin + var->hsync_len - 1);
429 writereg(par, DTG_VERT_EXTENT,
430 var->yres + var->upper_margin + var->lower_margin +
431 var->vsync_len - 1);
432 writereg(par, DTG_VERT_DISPLAY, var->yres - 1);
433 writereg(par, DTG_VSYNC_START, var->yres + var->lower_margin - 1);
434 writereg(par, DTG_VSYNC_END,
435 var->yres + var->lower_margin + var->vsync_len - 1);
436 prefetch_pix = 3300000 / var->pixclock;
437 if (prefetch_pix >= htot)
438 prefetch_pix = htot - 1;
439 writereg(par, DTG_VERT_SHORT, htot - prefetch_pix - 1);
440 ctrlreg |= DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH;
441 writereg(par, DTG_CONTROL, ctrlreg);
442
443 /* calculate stride in DFA aperture */
444 if (var->xres_virtual > 2048) {
445 stride = 4096;
446 dfa_ctl = DFA_FB_STRIDE_4k;
447 } else if (var->xres_virtual > 1024) {
448 stride = 2048;
449 dfa_ctl = DFA_FB_STRIDE_2k;
450 } else {
451 stride = 1024;
452 dfa_ctl = DFA_FB_STRIDE_1k;
453 }
454
455 /* Set up framebuffer definition */
456 wid_tiles = (var->xres_virtual + 63) >> 6;
457
458 /* XXX add proper FB allocation here someday */
459 writereg(par, FB_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
460 writereg(par, REFRESH_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
461 writereg(par, FB_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
462 writereg(par, REFRESH_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
463 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
464 writereg(par, REFRESH_SIZE, (var->xres << 16) | var->yres);
465
466 /* Set up framebuffer access by CPU */
467
468 pixfmt = par->pixfmt;
469 dfa_ctl |= DFA_FB_ENABLE | pixfmt;
470 writereg(par, DFA_FB_A, dfa_ctl);
471
472 /*
473 * Set up window attribute table.
474 * We set all WAT entries the same so it doesn't matter what the
475 * window ID (WID) plane contains.
476 */
477 for (i = 0; i < 32; ++i) {
478 writereg(par, WAT_FMT + (i << 4), watfmt[pixfmt]);
479 writereg(par, WAT_CMAP_OFFSET + (i << 4), 0);
480 writereg(par, WAT_CTRL + (i << 4), 0);
481 writereg(par, WAT_GAMMA_CTRL + (i << 4), WAT_GAMMA_DISABLE);
482 }
483
484 /* Set sync polarity etc. */
485 ctrlreg = readreg(par, SYNC_CTL) &
486 ~(SYNC_CTL_SYNC_ON_RGB | SYNC_CTL_HSYNC_INV |
487 SYNC_CTL_VSYNC_INV);
488 if (var->sync & FB_SYNC_ON_GREEN)
489 ctrlreg |= SYNC_CTL_SYNC_ON_RGB;
490 if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
491 ctrlreg |= SYNC_CTL_HSYNC_INV;
492 if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
493 ctrlreg |= SYNC_CTL_VSYNC_INV;
494 writereg(par, SYNC_CTL, ctrlreg);
495
496 info->fix.line_length = stride * pixsize[pixfmt];
497 info->fix.visual = (pixfmt == DFA_PIX_8BIT)? FB_VISUAL_PSEUDOCOLOR:
498 FB_VISUAL_DIRECTCOLOR;
499
500 return 0;
501 }
502
503 static int gxt4500_setcolreg(unsigned int reg, unsigned int red,
504 unsigned int green, unsigned int blue,
505 unsigned int transp, struct fb_info *info)
506 {
507 u32 cmap_entry;
508 struct gxt4500_par *par = info->par;
509
510 if (reg > 1023)
511 return 1;
512 cmap_entry = ((transp & 0xff00) << 16) | ((red & 0xff00) << 8) |
513 (green & 0xff00) | (blue >> 8);
514 writereg(par, CMAP + reg * 4, cmap_entry);
515
516 if (reg < 16 && par->pixfmt != DFA_PIX_8BIT) {
517 u32 *pal = info->pseudo_palette;
518 u32 val = reg;
519 switch (par->pixfmt) {
520 case DFA_PIX_16BIT_565:
521 val |= (reg << 11) | (reg << 6);
522 break;
523 case DFA_PIX_16BIT_1555:
524 val |= (reg << 10) | (reg << 5);
525 break;
526 case DFA_PIX_32BIT:
527 val |= (reg << 24);
528 /* fall through */
529 case DFA_PIX_24BIT:
530 val |= (reg << 16) | (reg << 8);
531 break;
532 }
533 pal[reg] = val;
534 }
535
536 return 0;
537 }
538
539 static int gxt4500_pan_display(struct fb_var_screeninfo *var,
540 struct fb_info *info)
541 {
542 struct gxt4500_par *par = info->par;
543
544 if (var->xoffset & 7)
545 return -EINVAL;
546 if (var->xoffset + var->xres > var->xres_virtual ||
547 var->yoffset + var->yres > var->yres_virtual)
548 return -EINVAL;
549
550 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
551 return 0;
552 }
553
554 static int gxt4500_blank(int blank, struct fb_info *info)
555 {
556 struct gxt4500_par *par = info->par;
557 int ctrl, dctl;
558
559 ctrl = readreg(par, SYNC_CTL);
560 ctrl &= ~(SYNC_CTL_SYNC_OFF | SYNC_CTL_HSYNC_OFF | SYNC_CTL_VSYNC_OFF);
561 dctl = readreg(par, DISP_CTL);
562 dctl |= DISP_CTL_OFF;
563 switch (blank) {
564 case FB_BLANK_UNBLANK:
565 dctl &= ~DISP_CTL_OFF;
566 break;
567 case FB_BLANK_POWERDOWN:
568 ctrl |= SYNC_CTL_SYNC_OFF;
569 break;
570 case FB_BLANK_HSYNC_SUSPEND:
571 ctrl |= SYNC_CTL_HSYNC_OFF;
572 break;
573 case FB_BLANK_VSYNC_SUSPEND:
574 ctrl |= SYNC_CTL_VSYNC_OFF;
575 break;
576 default: ;
577 }
578 writereg(par, SYNC_CTL, ctrl);
579 writereg(par, DISP_CTL, dctl);
580
581 return 0;
582 }
583
584 static const struct fb_fix_screeninfo gxt4500_fix __devinitdata = {
585 .id = "IBM GXT4500P",
586 .type = FB_TYPE_PACKED_PIXELS,
587 .visual = FB_VISUAL_PSEUDOCOLOR,
588 .xpanstep = 8,
589 .ypanstep = 1,
590 .mmio_len = 0x20000,
591 };
592
593 static struct fb_ops gxt4500_ops = {
594 .owner = THIS_MODULE,
595 .fb_check_var = gxt4500_check_var,
596 .fb_set_par = gxt4500_set_par,
597 .fb_setcolreg = gxt4500_setcolreg,
598 .fb_pan_display = gxt4500_pan_display,
599 .fb_blank = gxt4500_blank,
600 .fb_fillrect = cfb_fillrect,
601 .fb_copyarea = cfb_copyarea,
602 .fb_imageblit = cfb_imageblit,
603 };
604
605 /* PCI functions */
606 static int __devinit gxt4500_probe(struct pci_dev *pdev,
607 const struct pci_device_id *ent)
608 {
609 int err;
610 unsigned long reg_phys, fb_phys;
611 struct gxt4500_par *par;
612 struct fb_info *info;
613 struct fb_var_screeninfo var;
614 enum gxt_cards cardtype;
615
616 err = pci_enable_device(pdev);
617 if (err) {
618 dev_err(&pdev->dev, "gxt4500: cannot enable PCI device: %d\n",
619 err);
620 return err;
621 }
622
623 reg_phys = pci_resource_start(pdev, 0);
624 if (!request_mem_region(reg_phys, pci_resource_len(pdev, 0),
625 "gxt4500 regs")) {
626 dev_err(&pdev->dev, "gxt4500: cannot get registers\n");
627 goto err_nodev;
628 }
629
630 fb_phys = pci_resource_start(pdev, 1);
631 if (!request_mem_region(fb_phys, pci_resource_len(pdev, 1),
632 "gxt4500 FB")) {
633 dev_err(&pdev->dev, "gxt4500: cannot get framebuffer\n");
634 goto err_free_regs;
635 }
636
637 info = framebuffer_alloc(sizeof(struct gxt4500_par), &pdev->dev);
638 if (!info) {
639 dev_err(&pdev->dev, "gxt4500: cannot alloc FB info record\n");
640 goto err_free_fb;
641 }
642 par = info->par;
643 cardtype = ent->driver_data;
644 par->refclk_ps = cardinfo[cardtype].refclk_ps;
645 info->fix = gxt4500_fix;
646 strlcpy(info->fix.id, cardinfo[cardtype].cardname,
647 sizeof(info->fix.id));
648 info->pseudo_palette = par->pseudo_palette;
649
650 info->fix.mmio_start = reg_phys;
651 par->regs = ioremap(reg_phys, pci_resource_len(pdev, 0));
652 if (!par->regs) {
653 dev_err(&pdev->dev, "gxt4500: cannot map registers\n");
654 goto err_free_all;
655 }
656
657 info->fix.smem_start = fb_phys;
658 info->fix.smem_len = pci_resource_len(pdev, 1);
659 info->screen_base = ioremap(fb_phys, pci_resource_len(pdev, 1));
660 if (!info->screen_base) {
661 dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n");
662 goto err_unmap_regs;
663 }
664
665 pci_set_drvdata(pdev, info);
666
667 /* Set byte-swapping for DFA aperture for all pixel sizes */
668 pci_write_config_dword(pdev, CFG_ENDIAN0, 0x333300);
669
670 info->fbops = &gxt4500_ops;
671 info->flags = FBINFO_FLAG_DEFAULT;
672
673 err = fb_alloc_cmap(&info->cmap, 256, 0);
674 if (err) {
675 dev_err(&pdev->dev, "gxt4500: cannot allocate cmap\n");
676 goto err_unmap_all;
677 }
678
679 gxt4500_blank(FB_BLANK_UNBLANK, info);
680
681 if (!fb_find_mode(&var, info, mode_option, NULL, 0, &defaultmode, 8)) {
682 dev_err(&pdev->dev, "gxt4500: cannot find valid video mode\n");
683 goto err_free_cmap;
684 }
685 info->var = var;
686 if (gxt4500_set_par(info)) {
687 printk(KERN_ERR "gxt4500: cannot set video mode\n");
688 goto err_free_cmap;
689 }
690
691 if (register_framebuffer(info) < 0) {
692 dev_err(&pdev->dev, "gxt4500: cannot register framebuffer\n");
693 goto err_free_cmap;
694 }
695 printk(KERN_INFO "fb%d: %s frame buffer device\n",
696 info->node, info->fix.id);
697
698 return 0;
699
700 err_free_cmap:
701 fb_dealloc_cmap(&info->cmap);
702 err_unmap_all:
703 iounmap(info->screen_base);
704 err_unmap_regs:
705 iounmap(par->regs);
706 err_free_all:
707 framebuffer_release(info);
708 err_free_fb:
709 release_mem_region(fb_phys, pci_resource_len(pdev, 1));
710 err_free_regs:
711 release_mem_region(reg_phys, pci_resource_len(pdev, 0));
712 err_nodev:
713 return -ENODEV;
714 }
715
716 static void __devexit gxt4500_remove(struct pci_dev *pdev)
717 {
718 struct fb_info *info = pci_get_drvdata(pdev);
719 struct gxt4500_par *par;
720
721 if (!info)
722 return;
723 par = info->par;
724 unregister_framebuffer(info);
725 fb_dealloc_cmap(&info->cmap);
726 iounmap(par->regs);
727 iounmap(info->screen_base);
728 release_mem_region(pci_resource_start(pdev, 0),
729 pci_resource_len(pdev, 0));
730 release_mem_region(pci_resource_start(pdev, 1),
731 pci_resource_len(pdev, 1));
732 framebuffer_release(info);
733 }
734
735 /* supported chipsets */
736 static const struct pci_device_id gxt4500_pci_tbl[] = {
737 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4500P),
738 .driver_data = GXT4500P },
739 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6000P),
740 .driver_data = GXT6000P },
741 { 0 }
742 };
743
744 MODULE_DEVICE_TABLE(pci, gxt4500_pci_tbl);
745
746 static struct pci_driver gxt4500_driver = {
747 .name = "gxt4500",
748 .id_table = gxt4500_pci_tbl,
749 .probe = gxt4500_probe,
750 .remove = __devexit_p(gxt4500_remove),
751 };
752
753 static int __devinit gxt4500_init(void)
754 {
755 #ifndef MODULE
756 if (fb_get_options("gxt4500", &mode_option))
757 return -ENODEV;
758 #endif
759
760 return pci_register_driver(&gxt4500_driver);
761 }
762 module_init(gxt4500_init);
763
764 static void __exit gxt4500_exit(void)
765 {
766 pci_unregister_driver(&gxt4500_driver);
767 }
768 module_exit(gxt4500_exit);
769
770 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
771 MODULE_DESCRIPTION("FBDev driver for IBM GXT4500P/6000P");
772 MODULE_LICENSE("GPL");
773 module_param(mode_option, charp, 0);
774 MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
Support for the Chinese Samsung S3C2440 based development boards