1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Frame buffer device for IBM GXT4500P/6500P and GXT4000P/6000P
4 * display adaptors
5 *
6 * Copyright (C) 2006 Paul Mackerras, IBM Corp. <paulus@samba.org>
7 */
8
9 #include <linux/aperture.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/fb.h>
13 #include <linux/console.h>
14 #include <linux/pci.h>
15 #include <linux/pci_ids.h>
16 #include <linux/delay.h>
17 #include <linux/string.h>
18
19 #define PCI_DEVICE_ID_IBM_GXT4500P 0x21c
20 #define PCI_DEVICE_ID_IBM_GXT6500P 0x21b
21 #define PCI_DEVICE_ID_IBM_GXT4000P 0x16e
22 #define PCI_DEVICE_ID_IBM_GXT6000P 0x170
23
24 /* GXT4500P registers */
25
26 /* Registers in PCI config space */
27 #define CFG_ENDIAN0 0x40
28
29 /* Misc control/status registers */
30 #define STATUS 0x1000
31 #define CTRL_REG0 0x1004
32 #define CR0_HALT_DMA 0x4
33 #define CR0_RASTER_RESET 0x8
34 #define CR0_GEOM_RESET 0x10
35 #define CR0_MEM_CTRLER_RESET 0x20
36
37 /* Framebuffer control registers */
38 #define FB_AB_CTRL 0x1100
39 #define FB_CD_CTRL 0x1104
40 #define FB_WID_CTRL 0x1108
41 #define FB_Z_CTRL 0x110c
42 #define FB_VGA_CTRL 0x1110
43 #define REFRESH_AB_CTRL 0x1114
44 #define REFRESH_CD_CTRL 0x1118
45 #define FB_OVL_CTRL 0x111c
46 #define FB_CTRL_TYPE 0x80000000
47 #define FB_CTRL_WIDTH_MASK 0x007f0000
48 #define FB_CTRL_WIDTH_SHIFT 16
49 #define FB_CTRL_START_SEG_MASK 0x00003fff
50
51 #define REFRESH_START 0x1098
52 #define REFRESH_SIZE 0x109c
53
54 /* "Direct" framebuffer access registers */
55 #define DFA_FB_A 0x11e0
56 #define DFA_FB_B 0x11e4
57 #define DFA_FB_C 0x11e8
58 #define DFA_FB_D 0x11ec
59 #define DFA_FB_ENABLE 0x80000000
60 #define DFA_FB_BASE_MASK 0x03f00000
61 #define DFA_FB_STRIDE_1k 0x00000000
62 #define DFA_FB_STRIDE_2k 0x00000010
63 #define DFA_FB_STRIDE_4k 0x00000020
64 #define DFA_PIX_8BIT 0x00000000
65 #define DFA_PIX_16BIT_565 0x00000001
66 #define DFA_PIX_16BIT_1555 0x00000002
67 #define DFA_PIX_24BIT 0x00000004
68 #define DFA_PIX_32BIT 0x00000005
69
70 /* maps DFA_PIX_* to pixel size in bytes */
71 static const unsigned char pixsize[] = {
72 1, 2, 2, 2, 4, 4
73 };
74
75 /* Display timing generator registers */
76 #define DTG_CONTROL 0x1900
77 #define DTG_CTL_SCREEN_REFRESH 2
78 #define DTG_CTL_ENABLE 1
79 #define DTG_HORIZ_EXTENT 0x1904
80 #define DTG_HORIZ_DISPLAY 0x1908
81 #define DTG_HSYNC_START 0x190c
82 #define DTG_HSYNC_END 0x1910
83 #define DTG_HSYNC_END_COMP 0x1914
84 #define DTG_VERT_EXTENT 0x1918
85 #define DTG_VERT_DISPLAY 0x191c
86 #define DTG_VSYNC_START 0x1920
87 #define DTG_VSYNC_END 0x1924
88 #define DTG_VERT_SHORT 0x1928
89
90 /* PLL/RAMDAC registers */
91 #define DISP_CTL 0x402c
92 #define DISP_CTL_OFF 2
93 #define SYNC_CTL 0x4034
94 #define SYNC_CTL_SYNC_ON_RGB 1
95 #define SYNC_CTL_SYNC_OFF 2
96 #define SYNC_CTL_HSYNC_INV 8
97 #define SYNC_CTL_VSYNC_INV 0x10
98 #define SYNC_CTL_HSYNC_OFF 0x20
99 #define SYNC_CTL_VSYNC_OFF 0x40
100
101 #define PLL_M 0x4040
102 #define PLL_N 0x4044
103 #define PLL_POSTDIV 0x4048
104 #define PLL_C 0x404c
105
106 /* Hardware cursor */
107 #define CURSOR_X 0x4078
108 #define CURSOR_Y 0x407c
109 #define CURSOR_HOTSPOT 0x4080
110 #define CURSOR_MODE 0x4084
111 #define CURSOR_MODE_OFF 0
112 #define CURSOR_MODE_4BPP 1
113 #define CURSOR_PIXMAP 0x5000
114 #define CURSOR_CMAP 0x7400
115
116 /* Window attribute table */
117 #define WAT_FMT 0x4100
118 #define WAT_FMT_24BIT 0
119 #define WAT_FMT_16BIT_565 1
120 #define WAT_FMT_16BIT_1555 2
121 #define WAT_FMT_32BIT 3 /* 0 vs. 3 is a guess */
122 #define WAT_FMT_8BIT_332 9
123 #define WAT_FMT_8BIT 0xa
124 #define WAT_FMT_NO_CMAP 4 /* ORd in to other values */
125 #define WAT_CMAP_OFFSET 0x4104 /* 4-bit value gets << 6 */
126 #define WAT_CTRL 0x4108
127 #define WAT_CTRL_SEL_B 1 /* select B buffer if 1 */
128 #define WAT_CTRL_NO_INC 2
129 #define WAT_GAMMA_CTRL 0x410c
130 #define WAT_GAMMA_DISABLE 1 /* disables gamma cmap */
131 #define WAT_OVL_CTRL 0x430c /* controls overlay */
132
133 /* Indexed by DFA_PIX_* values */
134 static const unsigned char watfmt[] = {
135 WAT_FMT_8BIT, WAT_FMT_16BIT_565, WAT_FMT_16BIT_1555, 0,
136 WAT_FMT_24BIT, WAT_FMT_32BIT
137 };
138
139 /* Colormap array; 1k entries of 4 bytes each */
140 #define CMAP 0x6000
141
142 #define readreg(par, reg) readl((par)->regs + (reg))
143 #define writereg(par, reg, val) writel((val), (par)->regs + (reg))
144
145 struct gxt4500_par {
146 void __iomem *regs;
147 int wc_cookie;
148 int pixfmt; /* pixel format, see DFA_PIX_* values */
149
150 /* PLL parameters */
151 int refclk_ps; /* ref clock period in picoseconds */
152 int pll_m; /* ref clock divisor */
153 int pll_n; /* VCO divisor */
154 int pll_pd1; /* first post-divisor */
155 int pll_pd2; /* second post-divisor */
156
157 u32 pseudo_palette[16]; /* used in color blits */
158 };
159
160 /* mode requested by user */
161 static char *mode_option;
162
163 /* default mode: 1280x1024 @ 60 Hz, 8 bpp */
164 static const struct fb_videomode defaultmode = {
165 .refresh = 60,
166 .xres = 1280,
167 .yres = 1024,
168 .pixclock = 9295,
169 .left_margin = 248,
170 .right_margin = 48,
171 .upper_margin = 38,
172 .lower_margin = 1,
173 .hsync_len = 112,
174 .vsync_len = 3,
175 .vmode = FB_VMODE_NONINTERLACED
176 };
177
178 /* List of supported cards */
179 enum gxt_cards {
180 GXT4500P,
181 GXT6500P,
182 GXT4000P,
183 GXT6000P
184 };
185
186 /* Card-specific information */
187 static const struct cardinfo {
188 int refclk_ps; /* period of PLL reference clock in ps */
189 const char *cardname;
190 } cardinfo[] = {
191 [GXT4500P] = { .refclk_ps = 9259, .cardname = "IBM GXT4500P" },
192 [GXT6500P] = { .refclk_ps = 9259, .cardname = "IBM GXT6500P" },
193 [GXT4000P] = { .refclk_ps = 40000, .cardname = "IBM GXT4000P" },
194 [GXT6000P] = { .refclk_ps = 40000, .cardname = "IBM GXT6000P" },
195 };
196
197 /*
198 * The refclk and VCO dividers appear to use a linear feedback shift
199 * register, which gets reloaded when it reaches a terminal value, at
200 * which point the divider output is toggled. Thus one can obtain
201 * whatever divisor is required by putting the appropriate value into
202 * the reload register. For a divisor of N, one puts the value from
203 * the LFSR sequence that comes N-1 places before the terminal value
204 * into the reload register.
205 */
206
207 static const unsigned char mdivtab[] = {
208 /* 1 */ 0x3f, 0x00, 0x20, 0x10, 0x28, 0x14, 0x2a, 0x15, 0x0a,
209 /* 10 */ 0x25, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x09, 0x04, 0x22, 0x11,
210 /* 20 */ 0x08, 0x24, 0x12, 0x29, 0x34, 0x1a, 0x2d, 0x36, 0x1b, 0x0d,
211 /* 30 */ 0x06, 0x23, 0x31, 0x38, 0x1c, 0x2e, 0x17, 0x0b, 0x05, 0x02,
212 /* 40 */ 0x21, 0x30, 0x18, 0x2c, 0x16, 0x2b, 0x35, 0x3a, 0x1d, 0x0e,
213 /* 50 */ 0x27, 0x33, 0x39, 0x3c, 0x1e, 0x2f, 0x37, 0x3b, 0x3d, 0x3e,
214 /* 60 */ 0x1f, 0x0f, 0x07, 0x03, 0x01,
215 };
216
217 static const unsigned char ndivtab[] = {
218 /* 2 */ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x78, 0xbc, 0x5e,
219 /* 10 */ 0x2f, 0x17, 0x0b, 0x85, 0xc2, 0xe1, 0x70, 0x38, 0x9c, 0x4e,
220 /* 20 */ 0xa7, 0xd3, 0xe9, 0xf4, 0xfa, 0xfd, 0xfe, 0x7f, 0xbf, 0xdf,
221 /* 30 */ 0xef, 0x77, 0x3b, 0x1d, 0x8e, 0xc7, 0xe3, 0x71, 0xb8, 0xdc,
222 /* 40 */ 0x6e, 0xb7, 0x5b, 0x2d, 0x16, 0x8b, 0xc5, 0xe2, 0xf1, 0xf8,
223 /* 50 */ 0xfc, 0x7e, 0x3f, 0x9f, 0xcf, 0x67, 0xb3, 0xd9, 0x6c, 0xb6,
224 /* 60 */ 0xdb, 0x6d, 0x36, 0x9b, 0x4d, 0x26, 0x13, 0x89, 0xc4, 0x62,
225 /* 70 */ 0xb1, 0xd8, 0xec, 0xf6, 0xfb, 0x7d, 0xbe, 0x5f, 0xaf, 0x57,
226 /* 80 */ 0x2b, 0x95, 0x4a, 0x25, 0x92, 0x49, 0xa4, 0x52, 0x29, 0x94,
227 /* 90 */ 0xca, 0x65, 0xb2, 0x59, 0x2c, 0x96, 0xcb, 0xe5, 0xf2, 0x79,
228 /* 100 */ 0x3c, 0x1e, 0x0f, 0x07, 0x83, 0x41, 0x20, 0x90, 0x48, 0x24,
229 /* 110 */ 0x12, 0x09, 0x84, 0x42, 0xa1, 0x50, 0x28, 0x14, 0x8a, 0x45,
230 /* 120 */ 0xa2, 0xd1, 0xe8, 0x74, 0xba, 0xdd, 0xee, 0xf7, 0x7b, 0x3d,
231 /* 130 */ 0x9e, 0x4f, 0x27, 0x93, 0xc9, 0xe4, 0x72, 0x39, 0x1c, 0x0e,
232 /* 140 */ 0x87, 0xc3, 0x61, 0x30, 0x18, 0x8c, 0xc6, 0x63, 0x31, 0x98,
233 /* 150 */ 0xcc, 0xe6, 0x73, 0xb9, 0x5c, 0x2e, 0x97, 0x4b, 0xa5, 0xd2,
234 /* 160 */ 0x69,
235 };
236
calc_pll(int period_ps,struct gxt4500_par * par)237 static int calc_pll(int period_ps, struct gxt4500_par *par)
238 {
239 int m, n, pdiv1, pdiv2, postdiv;
240 int pll_period, best_error, t, intf;
241
242 /* only deal with range 5MHz - 300MHz */
243 if (period_ps < 3333 || period_ps > 200000)
244 return -1;
245
246 best_error = 1000000;
247 for (pdiv1 = 1; pdiv1 <= 8; ++pdiv1) {
248 for (pdiv2 = 1; pdiv2 <= pdiv1; ++pdiv2) {
249 postdiv = pdiv1 * pdiv2;
250 pll_period = DIV_ROUND_UP(period_ps, postdiv);
251 /* keep pll in range 350..600 MHz */
252 if (pll_period < 1666 || pll_period > 2857)
253 continue;
254 for (m = 1; m <= 64; ++m) {
255 intf = m * par->refclk_ps;
256 if (intf > 500000)
257 break;
258 n = intf * postdiv / period_ps;
259 if (n < 3 || n > 160)
260 continue;
261 t = par->refclk_ps * m * postdiv / n;
262 t -= period_ps;
263 if (t >= 0 && t < best_error) {
264 par->pll_m = m;
265 par->pll_n = n;
266 par->pll_pd1 = pdiv1;
267 par->pll_pd2 = pdiv2;
268 best_error = t;
269 }
270 }
271 }
272 }
273 if (best_error == 1000000)
274 return -1;
275 return 0;
276 }
277
calc_pixclock(struct gxt4500_par * par)278 static int calc_pixclock(struct gxt4500_par *par)
279 {
280 return par->refclk_ps * par->pll_m * par->pll_pd1 * par->pll_pd2
281 / par->pll_n;
282 }
283
gxt4500_var_to_par(struct fb_var_screeninfo * var,struct gxt4500_par * par)284 static int gxt4500_var_to_par(struct fb_var_screeninfo *var,
285 struct gxt4500_par *par)
286 {
287 if (var->xres + var->xoffset > var->xres_virtual ||
288 var->yres + var->yoffset > var->yres_virtual ||
289 var->xres_virtual > 4096)
290 return -EINVAL;
291 if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED)
292 return -EINVAL;
293
294 if (calc_pll(var->pixclock, par) < 0)
295 return -EINVAL;
296
297 switch (var->bits_per_pixel) {
298 case 32:
299 if (var->transp.length)
300 par->pixfmt = DFA_PIX_32BIT;
301 else
302 par->pixfmt = DFA_PIX_24BIT;
303 break;
304 case 24:
305 par->pixfmt = DFA_PIX_24BIT;
306 break;
307 case 16:
308 if (var->green.length == 5)
309 par->pixfmt = DFA_PIX_16BIT_1555;
310 else
311 par->pixfmt = DFA_PIX_16BIT_565;
312 break;
313 case 8:
314 par->pixfmt = DFA_PIX_8BIT;
315 break;
316 default:
317 return -EINVAL;
318 }
319
320 return 0;
321 }
322
323 static const struct fb_bitfield eightbits = {0, 8};
324 static const struct fb_bitfield nobits = {0, 0};
325
gxt4500_unpack_pixfmt(struct fb_var_screeninfo * var,int pixfmt)326 static void gxt4500_unpack_pixfmt(struct fb_var_screeninfo *var,
327 int pixfmt)
328 {
329 var->bits_per_pixel = pixsize[pixfmt] * 8;
330 var->red = eightbits;
331 var->green = eightbits;
332 var->blue = eightbits;
333 var->transp = nobits;
334
335 switch (pixfmt) {
336 case DFA_PIX_16BIT_565:
337 var->red.length = 5;
338 var->green.length = 6;
339 var->blue.length = 5;
340 break;
341 case DFA_PIX_16BIT_1555:
342 var->red.length = 5;
343 var->green.length = 5;
344 var->blue.length = 5;
345 var->transp.length = 1;
346 break;
347 case DFA_PIX_32BIT:
348 var->transp.length = 8;
349 break;
350 }
351 if (pixfmt != DFA_PIX_8BIT) {
352 var->blue.offset = 0;
353 var->green.offset = var->blue.length;
354 var->red.offset = var->green.offset + var->green.length;
355 if (var->transp.length)
356 var->transp.offset =
357 var->red.offset + var->red.length;
358 }
359 }
360
gxt4500_check_var(struct fb_var_screeninfo * var,struct fb_info * info)361 static int gxt4500_check_var(struct fb_var_screeninfo *var,
362 struct fb_info *info)
363 {
364 struct gxt4500_par par;
365 int err;
366
367 par = *(struct gxt4500_par *)info->par;
368 err = gxt4500_var_to_par(var, &par);
369 if (!err) {
370 var->pixclock = calc_pixclock(&par);
371 gxt4500_unpack_pixfmt(var, par.pixfmt);
372 }
373 return err;
374 }
375
gxt4500_set_par(struct fb_info * info)376 static int gxt4500_set_par(struct fb_info *info)
377 {
378 struct gxt4500_par *par = info->par;
379 struct fb_var_screeninfo *var = &info->var;
380 int err;
381 u32 ctrlreg, tmp;
382 unsigned int dfa_ctl, pixfmt, stride;
383 unsigned int wid_tiles, i;
384 unsigned int prefetch_pix, htot;
385 struct gxt4500_par save_par;
386
387 save_par = *par;
388 err = gxt4500_var_to_par(var, par);
389 if (err) {
390 *par = save_par;
391 return err;
392 }
393
394 /* turn off DTG for now */
395 ctrlreg = readreg(par, DTG_CONTROL);
396 ctrlreg &= ~(DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH);
397 writereg(par, DTG_CONTROL, ctrlreg);
398
399 /* set PLL registers */
400 tmp = readreg(par, PLL_C) & ~0x7f;
401 if (par->pll_n < 38)
402 tmp |= 0x29;
403 if (par->pll_n < 69)
404 tmp |= 0x35;
405 else if (par->pll_n < 100)
406 tmp |= 0x76;
407 else
408 tmp |= 0x7e;
409 writereg(par, PLL_C, tmp);
410 writereg(par, PLL_M, mdivtab[par->pll_m - 1]);
411 writereg(par, PLL_N, ndivtab[par->pll_n - 2]);
412 tmp = ((8 - par->pll_pd2) << 3) | (8 - par->pll_pd1);
413 if (par->pll_pd1 == 8 || par->pll_pd2 == 8) {
414 /* work around erratum */
415 writereg(par, PLL_POSTDIV, tmp | 0x9);
416 udelay(1);
417 }
418 writereg(par, PLL_POSTDIV, tmp);
419 msleep(20);
420
421 /* turn off hardware cursor */
422 writereg(par, CURSOR_MODE, CURSOR_MODE_OFF);
423
424 /* reset raster engine */
425 writereg(par, CTRL_REG0, CR0_RASTER_RESET | (CR0_RASTER_RESET << 16));
426 udelay(10);
427 writereg(par, CTRL_REG0, CR0_RASTER_RESET << 16);
428
429 /* set display timing generator registers */
430 htot = var->xres + var->left_margin + var->right_margin +
431 var->hsync_len;
432 writereg(par, DTG_HORIZ_EXTENT, htot - 1);
433 writereg(par, DTG_HORIZ_DISPLAY, var->xres - 1);
434 writereg(par, DTG_HSYNC_START, var->xres + var->right_margin - 1);
435 writereg(par, DTG_HSYNC_END,
436 var->xres + var->right_margin + var->hsync_len - 1);
437 writereg(par, DTG_HSYNC_END_COMP,
438 var->xres + var->right_margin + var->hsync_len - 1);
439 writereg(par, DTG_VERT_EXTENT,
440 var->yres + var->upper_margin + var->lower_margin +
441 var->vsync_len - 1);
442 writereg(par, DTG_VERT_DISPLAY, var->yres - 1);
443 writereg(par, DTG_VSYNC_START, var->yres + var->lower_margin - 1);
444 writereg(par, DTG_VSYNC_END,
445 var->yres + var->lower_margin + var->vsync_len - 1);
446 prefetch_pix = 3300000 / var->pixclock;
447 if (prefetch_pix >= htot)
448 prefetch_pix = htot - 1;
449 writereg(par, DTG_VERT_SHORT, htot - prefetch_pix - 1);
450 ctrlreg |= DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH;
451 writereg(par, DTG_CONTROL, ctrlreg);
452
453 /* calculate stride in DFA aperture */
454 if (var->xres_virtual > 2048) {
455 stride = 4096;
456 dfa_ctl = DFA_FB_STRIDE_4k;
457 } else if (var->xres_virtual > 1024) {
458 stride = 2048;
459 dfa_ctl = DFA_FB_STRIDE_2k;
460 } else {
461 stride = 1024;
462 dfa_ctl = DFA_FB_STRIDE_1k;
463 }
464
465 /* Set up framebuffer definition */
466 wid_tiles = (var->xres_virtual + 63) >> 6;
467
468 /* XXX add proper FB allocation here someday */
469 writereg(par, FB_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
470 writereg(par, REFRESH_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
471 writereg(par, FB_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
472 writereg(par, REFRESH_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0);
473 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
474 writereg(par, REFRESH_SIZE, (var->xres << 16) | var->yres);
475
476 /* Set up framebuffer access by CPU */
477
478 pixfmt = par->pixfmt;
479 dfa_ctl |= DFA_FB_ENABLE | pixfmt;
480 writereg(par, DFA_FB_A, dfa_ctl);
481
482 /*
483 * Set up window attribute table.
484 * We set all WAT entries the same so it doesn't matter what the
485 * window ID (WID) plane contains.
486 */
487 for (i = 0; i < 32; ++i) {
488 writereg(par, WAT_FMT + (i << 4), watfmt[pixfmt]);
489 writereg(par, WAT_CMAP_OFFSET + (i << 4), 0);
490 writereg(par, WAT_CTRL + (i << 4), 0);
491 writereg(par, WAT_GAMMA_CTRL + (i << 4), WAT_GAMMA_DISABLE);
492 }
493
494 /* Set sync polarity etc. */
495 ctrlreg = readreg(par, SYNC_CTL) &
496 ~(SYNC_CTL_SYNC_ON_RGB | SYNC_CTL_HSYNC_INV |
497 SYNC_CTL_VSYNC_INV);
498 if (var->sync & FB_SYNC_ON_GREEN)
499 ctrlreg |= SYNC_CTL_SYNC_ON_RGB;
500 if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
501 ctrlreg |= SYNC_CTL_HSYNC_INV;
502 if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
503 ctrlreg |= SYNC_CTL_VSYNC_INV;
504 writereg(par, SYNC_CTL, ctrlreg);
505
506 info->fix.line_length = stride * pixsize[pixfmt];
507 info->fix.visual = (pixfmt == DFA_PIX_8BIT)? FB_VISUAL_PSEUDOCOLOR:
508 FB_VISUAL_DIRECTCOLOR;
509
510 return 0;
511 }
512
gxt4500_setcolreg(unsigned int reg,unsigned int red,unsigned int green,unsigned int blue,unsigned int transp,struct fb_info * info)513 static int gxt4500_setcolreg(unsigned int reg, unsigned int red,
514 unsigned int green, unsigned int blue,
515 unsigned int transp, struct fb_info *info)
516 {
517 u32 cmap_entry;
518 struct gxt4500_par *par = info->par;
519
520 if (reg > 1023)
521 return 1;
522 cmap_entry = ((transp & 0xff00) << 16) | ((red & 0xff00) << 8) |
523 (green & 0xff00) | (blue >> 8);
524 writereg(par, CMAP + reg * 4, cmap_entry);
525
526 if (reg < 16 && par->pixfmt != DFA_PIX_8BIT) {
527 u32 *pal = info->pseudo_palette;
528 u32 val = reg;
529 switch (par->pixfmt) {
530 case DFA_PIX_16BIT_565:
531 val |= (reg << 11) | (reg << 5);
532 break;
533 case DFA_PIX_16BIT_1555:
534 val |= (reg << 10) | (reg << 5);
535 break;
536 case DFA_PIX_32BIT:
537 val |= (reg << 24);
538 fallthrough;
539 case DFA_PIX_24BIT:
540 val |= (reg << 16) | (reg << 8);
541 break;
542 }
543 pal[reg] = val;
544 }
545
546 return 0;
547 }
548
gxt4500_pan_display(struct fb_var_screeninfo * var,struct fb_info * info)549 static int gxt4500_pan_display(struct fb_var_screeninfo *var,
550 struct fb_info *info)
551 {
552 struct gxt4500_par *par = info->par;
553
554 if (var->xoffset & 7)
555 return -EINVAL;
556 if (var->xoffset + info->var.xres > info->var.xres_virtual ||
557 var->yoffset + info->var.yres > info->var.yres_virtual)
558 return -EINVAL;
559
560 writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset);
561 return 0;
562 }
563
gxt4500_blank(int blank,struct fb_info * info)564 static int gxt4500_blank(int blank, struct fb_info *info)
565 {
566 struct gxt4500_par *par = info->par;
567 int ctrl, dctl;
568
569 ctrl = readreg(par, SYNC_CTL);
570 ctrl &= ~(SYNC_CTL_SYNC_OFF | SYNC_CTL_HSYNC_OFF | SYNC_CTL_VSYNC_OFF);
571 dctl = readreg(par, DISP_CTL);
572 dctl |= DISP_CTL_OFF;
573 switch (blank) {
574 case FB_BLANK_UNBLANK:
575 dctl &= ~DISP_CTL_OFF;
576 break;
577 case FB_BLANK_POWERDOWN:
578 ctrl |= SYNC_CTL_SYNC_OFF;
579 break;
580 case FB_BLANK_HSYNC_SUSPEND:
581 ctrl |= SYNC_CTL_HSYNC_OFF;
582 break;
583 case FB_BLANK_VSYNC_SUSPEND:
584 ctrl |= SYNC_CTL_VSYNC_OFF;
585 break;
586 default: ;
587 }
588 writereg(par, SYNC_CTL, ctrl);
589 writereg(par, DISP_CTL, dctl);
590
591 return 0;
592 }
593
594 static const struct fb_fix_screeninfo gxt4500_fix = {
595 .id = "IBM GXT4500P",
596 .type = FB_TYPE_PACKED_PIXELS,
597 .visual = FB_VISUAL_PSEUDOCOLOR,
598 .xpanstep = 8,
599 .ypanstep = 1,
600 .mmio_len = 0x20000,
601 };
602
603 static const struct fb_ops gxt4500_ops = {
604 .owner = THIS_MODULE,
605 FB_DEFAULT_IOMEM_OPS,
606 .fb_check_var = gxt4500_check_var,
607 .fb_set_par = gxt4500_set_par,
608 .fb_setcolreg = gxt4500_setcolreg,
609 .fb_pan_display = gxt4500_pan_display,
610 .fb_blank = gxt4500_blank,
611 };
612
613 /* PCI functions */
gxt4500_probe(struct pci_dev * pdev,const struct pci_device_id * ent)614 static int gxt4500_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
615 {
616 int err;
617 unsigned long reg_phys, fb_phys;
618 struct gxt4500_par *par;
619 struct fb_info *info;
620 struct fb_var_screeninfo var;
621 enum gxt_cards cardtype;
622
623 err = aperture_remove_conflicting_pci_devices(pdev, "gxt4500fb");
624 if (err)
625 return err;
626
627 err = pci_enable_device(pdev);
628 if (err) {
629 dev_err(&pdev->dev, "gxt4500: cannot enable PCI device: %d\n",
630 err);
631 return err;
632 }
633
634 reg_phys = pci_resource_start(pdev, 0);
635 if (!request_mem_region(reg_phys, pci_resource_len(pdev, 0),
636 "gxt4500 regs")) {
637 dev_err(&pdev->dev, "gxt4500: cannot get registers\n");
638 goto err_nodev;
639 }
640
641 fb_phys = pci_resource_start(pdev, 1);
642 if (!request_mem_region(fb_phys, pci_resource_len(pdev, 1),
643 "gxt4500 FB")) {
644 dev_err(&pdev->dev, "gxt4500: cannot get framebuffer\n");
645 goto err_free_regs;
646 }
647
648 info = framebuffer_alloc(sizeof(struct gxt4500_par), &pdev->dev);
649 if (!info)
650 goto err_free_fb;
651
652 par = info->par;
653 cardtype = ent->driver_data;
654 par->refclk_ps = cardinfo[cardtype].refclk_ps;
655 info->fix = gxt4500_fix;
656 strscpy(info->fix.id, cardinfo[cardtype].cardname,
657 sizeof(info->fix.id));
658 info->pseudo_palette = par->pseudo_palette;
659
660 info->fix.mmio_start = reg_phys;
661 par->regs = pci_ioremap_bar(pdev, 0);
662 if (!par->regs) {
663 dev_err(&pdev->dev, "gxt4500: cannot map registers\n");
664 goto err_free_all;
665 }
666
667 info->fix.smem_start = fb_phys;
668 info->fix.smem_len = pci_resource_len(pdev, 1);
669 info->screen_base = pci_ioremap_wc_bar(pdev, 1);
670 if (!info->screen_base) {
671 dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n");
672 goto err_unmap_regs;
673 }
674
675 pci_set_drvdata(pdev, info);
676
677 par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
678 info->fix.smem_len);
679
680 #ifdef __BIG_ENDIAN
681 /* Set byte-swapping for DFA aperture for all pixel sizes */
682 pci_write_config_dword(pdev, CFG_ENDIAN0, 0x333300);
683 #else /* __LITTLE_ENDIAN */
684 /* not sure what this means but fgl23 driver does that */
685 pci_write_config_dword(pdev, CFG_ENDIAN0, 0x2300);
686 /* pci_write_config_dword(pdev, CFG_ENDIAN0 + 4, 0x400000);*/
687 pci_write_config_dword(pdev, CFG_ENDIAN0 + 8, 0x98530000);
688 #endif
689
690 info->fbops = &gxt4500_ops;
691 info->flags = FBINFO_HWACCEL_XPAN | FBINFO_HWACCEL_YPAN;
692
693 err = fb_alloc_cmap(&info->cmap, 256, 0);
694 if (err) {
695 dev_err(&pdev->dev, "gxt4500: cannot allocate cmap\n");
696 goto err_unmap_all;
697 }
698
699 gxt4500_blank(FB_BLANK_UNBLANK, info);
700
701 if (!fb_find_mode(&var, info, mode_option, NULL, 0, &defaultmode, 8)) {
702 dev_err(&pdev->dev, "gxt4500: cannot find valid video mode\n");
703 goto err_free_cmap;
704 }
705 info->var = var;
706 if (gxt4500_set_par(info)) {
707 printk(KERN_ERR "gxt4500: cannot set video mode\n");
708 goto err_free_cmap;
709 }
710
711 if (register_framebuffer(info) < 0) {
712 dev_err(&pdev->dev, "gxt4500: cannot register framebuffer\n");
713 goto err_free_cmap;
714 }
715 fb_info(info, "%s frame buffer device\n", info->fix.id);
716
717 return 0;
718
719 err_free_cmap:
720 fb_dealloc_cmap(&info->cmap);
721 err_unmap_all:
722 iounmap(info->screen_base);
723 err_unmap_regs:
724 iounmap(par->regs);
725 err_free_all:
726 framebuffer_release(info);
727 err_free_fb:
728 release_mem_region(fb_phys, pci_resource_len(pdev, 1));
729 err_free_regs:
730 release_mem_region(reg_phys, pci_resource_len(pdev, 0));
731 err_nodev:
732 return -ENODEV;
733 }
734
gxt4500_remove(struct pci_dev * pdev)735 static void gxt4500_remove(struct pci_dev *pdev)
736 {
737 struct fb_info *info = pci_get_drvdata(pdev);
738 struct gxt4500_par *par;
739
740 if (!info)
741 return;
742 par = info->par;
743 unregister_framebuffer(info);
744 arch_phys_wc_del(par->wc_cookie);
745 fb_dealloc_cmap(&info->cmap);
746 iounmap(par->regs);
747 iounmap(info->screen_base);
748 release_mem_region(pci_resource_start(pdev, 0),
749 pci_resource_len(pdev, 0));
750 release_mem_region(pci_resource_start(pdev, 1),
751 pci_resource_len(pdev, 1));
752 framebuffer_release(info);
753 }
754
755 /* supported chipsets */
756 static const struct pci_device_id gxt4500_pci_tbl[] = {
757 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4500P),
758 .driver_data = GXT4500P },
759 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6500P),
760 .driver_data = GXT6500P },
761 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4000P),
762 .driver_data = GXT4000P },
763 { PCI_DEVICE(PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT6000P),
764 .driver_data = GXT6000P },
765 { 0 }
766 };
767
768 MODULE_DEVICE_TABLE(pci, gxt4500_pci_tbl);
769
770 static struct pci_driver gxt4500_driver = {
771 .name = "gxt4500",
772 .id_table = gxt4500_pci_tbl,
773 .probe = gxt4500_probe,
774 .remove = gxt4500_remove,
775 };
776
gxt4500_init(void)777 static int gxt4500_init(void)
778 {
779 if (fb_modesetting_disabled("gxt4500"))
780 return -ENODEV;
781
782 #ifndef MODULE
783 if (fb_get_options("gxt4500", &mode_option))
784 return -ENODEV;
785 #endif
786
787 return pci_register_driver(&gxt4500_driver);
788 }
789 module_init(gxt4500_init);
790
gxt4500_exit(void)791 static void __exit gxt4500_exit(void)
792 {
793 pci_unregister_driver(&gxt4500_driver);
794 }
795 module_exit(gxt4500_exit);
796
797 MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>");
798 MODULE_DESCRIPTION("FBDev driver for IBM GXT4500P/6500P and GXT4000P/6000P");
799 MODULE_LICENSE("GPL");
800 module_param(mode_option, charp, 0);
801 MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
802