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a3d89983 PM |
1 | /* |
2 | * Frame buffer device for IBM GXT4500P display adaptor | |
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 | ||
15 | #define PCI_DEVICE_ID_IBM_GXT4500P 0x21c | |
16 | ||
17 | /* GXT4500P registers */ | |
18 | ||
19 | /* Registers in PCI config space */ | |
20 | #define CFG_ENDIAN0 0x40 | |
21 | ||
22 | /* Misc control/status registers */ | |
23 | #define STATUS 0x1000 | |
24 | #define CTRL_REG0 0x1004 | |
25 | #define CR0_HALT_DMA 0x4 | |
26 | #define CR0_RASTER_RESET 0x8 | |
27 | #define CR0_GEOM_RESET 0x10 | |
28 | #define CR0_MEM_CTRLER_RESET 0x20 | |
29 | ||
30 | /* Framebuffer control registers */ | |
31 | #define FB_AB_CTRL 0x1100 | |
32 | #define FB_CD_CTRL 0x1104 | |
33 | #define FB_WID_CTRL 0x1108 | |
34 | #define FB_Z_CTRL 0x110c | |
35 | #define FB_VGA_CTRL 0x1110 | |
36 | #define REFRESH_AB_CTRL 0x1114 | |
37 | #define REFRESH_CD_CTRL 0x1118 | |
38 | #define FB_OVL_CTRL 0x111c | |
39 | #define FB_CTRL_TYPE 0x80000000 | |
40 | #define FB_CTRL_WIDTH_MASK 0x007f0000 | |
41 | #define FB_CTRL_WIDTH_SHIFT 16 | |
42 | #define FB_CTRL_START_SEG_MASK 0x00003fff | |
43 | ||
44 | #define REFRESH_START 0x1098 | |
45 | #define REFRESH_SIZE 0x109c | |
46 | ||
47 | /* "Direct" framebuffer access registers */ | |
48 | #define DFA_FB_A 0x11e0 | |
49 | #define DFA_FB_B 0x11e4 | |
50 | #define DFA_FB_C 0x11e8 | |
51 | #define DFA_FB_D 0x11ec | |
52 | #define DFA_FB_ENABLE 0x80000000 | |
53 | #define DFA_FB_BASE_MASK 0x03f00000 | |
54 | #define DFA_FB_STRIDE_1k 0x00000000 | |
55 | #define DFA_FB_STRIDE_2k 0x00000010 | |
56 | #define DFA_FB_STRIDE_4k 0x00000020 | |
57 | #define DFA_PIX_8BIT 0x00000000 | |
58 | #define DFA_PIX_16BIT_565 0x00000001 | |
59 | #define DFA_PIX_16BIT_1555 0x00000002 | |
60 | #define DFA_PIX_24BIT 0x00000004 | |
61 | #define DFA_PIX_32BIT 0x00000005 | |
62 | ||
63 | /* maps DFA_PIX_* to pixel size in bytes */ | |
64 | static const unsigned char pixsize[] = { | |
65 | 1, 2, 2, 2, 4, 4 | |
66 | }; | |
67 | ||
68 | /* Display timing generator registers */ | |
69 | #define DTG_CONTROL 0x1900 | |
70 | #define DTG_CTL_SCREEN_REFRESH 2 | |
71 | #define DTG_CTL_ENABLE 1 | |
72 | #define DTG_HORIZ_EXTENT 0x1904 | |
73 | #define DTG_HORIZ_DISPLAY 0x1908 | |
74 | #define DTG_HSYNC_START 0x190c | |
75 | #define DTG_HSYNC_END 0x1910 | |
76 | #define DTG_HSYNC_END_COMP 0x1914 | |
77 | #define DTG_VERT_EXTENT 0x1918 | |
78 | #define DTG_VERT_DISPLAY 0x191c | |
79 | #define DTG_VSYNC_START 0x1920 | |
80 | #define DTG_VSYNC_END 0x1924 | |
81 | #define DTG_VERT_SHORT 0x1928 | |
82 | ||
83 | /* PLL/RAMDAC registers */ | |
84 | #define DISP_CTL 0x402c | |
85 | #define DISP_CTL_OFF 2 | |
86 | #define SYNC_CTL 0x4034 | |
87 | #define SYNC_CTL_SYNC_ON_RGB 1 | |
88 | #define SYNC_CTL_SYNC_OFF 2 | |
89 | #define SYNC_CTL_HSYNC_INV 8 | |
90 | #define SYNC_CTL_VSYNC_INV 0x10 | |
91 | #define SYNC_CTL_HSYNC_OFF 0x20 | |
92 | #define SYNC_CTL_VSYNC_OFF 0x40 | |
93 | ||
94 | #define PLL_M 0x4040 | |
95 | #define PLL_N 0x4044 | |
96 | #define PLL_POSTDIV 0x4048 | |
97 | ||
98 | /* Hardware cursor */ | |
99 | #define CURSOR_X 0x4078 | |
100 | #define CURSOR_Y 0x407c | |
101 | #define CURSOR_HOTSPOT 0x4080 | |
102 | #define CURSOR_MODE 0x4084 | |
103 | #define CURSOR_MODE_OFF 0 | |
104 | #define CURSOR_MODE_4BPP 1 | |
105 | #define CURSOR_PIXMAP 0x5000 | |
106 | #define CURSOR_CMAP 0x7400 | |
107 | ||
108 | /* Window attribute table */ | |
109 | #define WAT_FMT 0x4100 | |
110 | #define WAT_FMT_24BIT 0 | |
111 | #define WAT_FMT_16BIT_565 1 | |
112 | #define WAT_FMT_16BIT_1555 2 | |
113 | #define WAT_FMT_32BIT 3 /* 0 vs. 3 is a guess */ | |
114 | #define WAT_FMT_8BIT_332 9 | |
115 | #define WAT_FMT_8BIT 0xa | |
116 | #define WAT_FMT_NO_CMAP 4 /* ORd in to other values */ | |
117 | #define WAT_CMAP_OFFSET 0x4104 /* 4-bit value gets << 6 */ | |
118 | #define WAT_CTRL 0x4108 | |
119 | #define WAT_CTRL_SEL_B 1 /* select B buffer if 1 */ | |
120 | #define WAT_CTRL_NO_INC 2 | |
121 | #define WAT_GAMMA_CTRL 0x410c | |
122 | #define WAT_GAMMA_DISABLE 1 /* disables gamma cmap */ | |
123 | #define WAT_OVL_CTRL 0x430c /* controls overlay */ | |
124 | ||
125 | /* Indexed by DFA_PIX_* values */ | |
126 | static const unsigned char watfmt[] = { | |
127 | WAT_FMT_8BIT, WAT_FMT_16BIT_565, WAT_FMT_16BIT_1555, 0, | |
128 | WAT_FMT_24BIT, WAT_FMT_32BIT | |
129 | }; | |
130 | ||
131 | /* Colormap array; 1k entries of 4 bytes each */ | |
132 | #define CMAP 0x6000 | |
133 | ||
134 | #define readreg(par, reg) readl((par)->regs + (reg)) | |
135 | #define writereg(par, reg, val) writel((val), (par)->regs + (reg)) | |
136 | ||
137 | struct gxt4500_par { | |
138 | void __iomem *regs; | |
139 | ||
140 | int pixfmt; /* pixel format, see DFA_PIX_* values */ | |
141 | ||
142 | /* PLL parameters */ | |
143 | int pll_m; /* ref clock divisor */ | |
144 | int pll_n; /* VCO divisor */ | |
145 | int pll_pd1; /* first post-divisor */ | |
146 | int pll_pd2; /* second post-divisor */ | |
147 | ||
148 | u32 pseudo_palette[16]; /* used in color blits */ | |
149 | }; | |
150 | ||
151 | /* mode requested by user */ | |
152 | static char *mode_option; | |
153 | ||
154 | /* default mode: 1280x1024 @ 60 Hz, 8 bpp */ | |
155 | static const struct fb_videomode defaultmode __devinitdata = { | |
156 | .refresh = 60, | |
157 | .xres = 1280, | |
158 | .yres = 1024, | |
159 | .pixclock = 9295, | |
160 | .left_margin = 248, | |
161 | .right_margin = 48, | |
162 | .upper_margin = 38, | |
163 | .lower_margin = 1, | |
164 | .hsync_len = 112, | |
165 | .vsync_len = 3, | |
166 | .vmode = FB_VMODE_NONINTERLACED | |
167 | }; | |
168 | ||
169 | /* | |
170 | * The refclk and VCO dividers appear to use a linear feedback shift | |
171 | * register, which gets reloaded when it reaches a terminal value, at | |
172 | * which point the divider output is toggled. Thus one can obtain | |
173 | * whatever divisor is required by putting the appropriate value into | |
174 | * the reload register. For a divisor of N, one puts the value from | |
175 | * the LFSR sequence that comes N-1 places before the terminal value | |
176 | * into the reload register. | |
177 | */ | |
178 | ||
179 | static const unsigned char mdivtab[] = { | |
180 | /* 1 */ 0x3f, 0x00, 0x20, 0x10, 0x28, 0x14, 0x2a, 0x15, 0x0a, | |
181 | /* 10 */ 0x25, 0x32, 0x19, 0x0c, 0x26, 0x13, 0x09, 0x04, 0x22, 0x11, | |
182 | /* 20 */ 0x08, 0x24, 0x12, 0x29, 0x34, 0x1a, 0x2d, 0x36, 0x1b, 0x0d, | |
183 | /* 30 */ 0x06, 0x23, 0x31, 0x38, 0x1c, 0x2e, 0x17, 0x0b, 0x05, 0x02, | |
184 | /* 40 */ 0x21, 0x30, 0x18, 0x2c, 0x16, 0x2b, 0x35, 0x3a, 0x1d, 0x0e, | |
185 | /* 50 */ 0x27, 0x33, 0x39, 0x3c, 0x1e, 0x2f, 0x37, 0x3b, 0x3d, 0x3e, | |
186 | /* 60 */ 0x1f, 0x0f, 0x07, 0x03, 0x01, | |
187 | }; | |
188 | ||
189 | static const unsigned char ndivtab[] = { | |
190 | /* 2 */ 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0x78, 0xbc, 0x5e, | |
191 | /* 10 */ 0x2f, 0x17, 0x0b, 0x85, 0xc2, 0xe1, 0x70, 0x38, 0x9c, 0x4e, | |
192 | /* 20 */ 0xa7, 0xd3, 0xe9, 0xf4, 0xfa, 0xfd, 0xfe, 0x7f, 0xbf, 0xdf, | |
193 | /* 30 */ 0xef, 0x77, 0x3b, 0x1d, 0x8e, 0xc7, 0xe3, 0x71, 0xb8, 0xdc, | |
194 | /* 40 */ 0x6e, 0xb7, 0x5b, 0x2d, 0x16, 0x8b, 0xc5, 0xe2, 0xf1, 0xf8, | |
195 | /* 50 */ 0xfc, 0x7e, 0x3f, 0x9f, 0xcf, 0x67, 0xb3, 0xd9, 0x6c, 0xb6, | |
196 | /* 60 */ 0xdb, 0x6d, 0x36, 0x9b, 0x4d, 0x26, 0x13, 0x89, 0xc4, 0x62, | |
197 | /* 70 */ 0xb1, 0xd8, 0xec, 0xf6, 0xfb, 0x7d, 0xbe, 0x5f, 0xaf, 0x57, | |
198 | /* 80 */ 0x2b, 0x95, 0x4a, 0x25, 0x92, 0x49, 0xa4, 0x52, 0x29, 0x94, | |
199 | /* 90 */ 0xca, 0x65, 0xb2, 0x59, 0x2c, 0x96, 0xcb, 0xe5, 0xf2, 0x79, | |
200 | /* 100 */ 0x3c, 0x1e, 0x0f, 0x07, 0x83, 0x41, 0x20, 0x90, 0x48, 0x24, | |
201 | /* 110 */ 0x12, 0x09, 0x84, 0x42, 0xa1, 0x50, 0x28, 0x14, 0x8a, 0x45, | |
202 | /* 120 */ 0xa2, 0xd1, 0xe8, 0x74, 0xba, 0xdd, 0xee, 0xf7, 0x7b, 0x3d, | |
203 | /* 130 */ 0x9e, 0x4f, 0x27, 0x93, 0xc9, 0xe4, 0x72, 0x39, 0x1c, 0x0e, | |
204 | /* 140 */ 0x87, 0xc3, 0x61, 0x30, 0x18, 0x8c, 0xc6, 0x63, 0x31, 0x98, | |
205 | /* 150 */ 0xcc, 0xe6, 0x73, 0xb9, 0x5c, 0x2e, 0x97, 0x4b, 0xa5, 0xd2, | |
206 | /* 160 */ 0x69, 0xb4, 0xda, 0xed, 0x76, 0xbb, 0x5d, 0xae, 0xd7, 0x6b, | |
207 | /* 170 */ 0xb5, 0x5a, 0xad, 0x56, 0xab, 0xd5, 0x6a, 0x35, 0x1a, 0x8d, | |
208 | /* 180 */ 0x46, 0x23, 0x11, 0x88, 0x44, 0x22, 0x91, 0xc8, 0x64, 0x32, | |
209 | /* 190 */ 0x19, 0x0c, 0x86, 0x43, 0x21, 0x10, 0x08, 0x04, 0x02, 0x81, | |
210 | /* 200 */ 0x40, 0xa0, 0xd0, 0x68, 0x34, 0x9a, 0xcd, 0x66, 0x33, 0x99, | |
211 | /* 210 */ 0x4c, 0xa6, 0x53, 0xa9, 0xd4, 0xea, 0x75, 0x3a, 0x9d, 0xce, | |
212 | /* 220 */ 0xe7, 0xf3, 0xf9, 0x7c, 0x3e, 0x1f, 0x8f, 0x47, 0xa3, 0x51, | |
213 | /* 230 */ 0xa8, 0x54, 0xaa, 0x55, 0x2a, 0x15, 0x0a, 0x05, 0x82, 0xc1, | |
214 | /* 240 */ 0x60, 0xb0, 0x58, 0xac, 0xd6, 0xeb, 0xf5, 0x7a, 0xbd, 0xde, | |
215 | /* 250 */ 0x6f, 0x37, 0x1b, 0x0d, 0x06, 0x03, 0x01, | |
216 | }; | |
217 | ||
218 | #define REF_PERIOD_PS 9259 /* period of reference clock in ps */ | |
219 | ||
220 | static int calc_pll(int period_ps, struct gxt4500_par *par) | |
221 | { | |
222 | int m, n, pdiv1, pdiv2, postdiv; | |
223 | int pll_period, best_error, t; | |
224 | ||
225 | /* only deal with range 1MHz - 400MHz */ | |
226 | if (period_ps < 2500 || period_ps > 1000000) | |
227 | return -1; | |
228 | ||
229 | best_error = 1000000; | |
230 | for (pdiv1 = 1; pdiv1 <= 8; ++pdiv1) { | |
231 | for (pdiv2 = 1; pdiv2 <= pdiv1; ++pdiv2) { | |
232 | postdiv = pdiv1 * pdiv2; | |
233 | pll_period = (period_ps + postdiv - 1) / postdiv; | |
234 | /* keep pll in range 500..1250 MHz */ | |
235 | if (pll_period < 800 || pll_period > 2000) | |
236 | continue; | |
237 | for (m = 3; m <= 40; ++m) { | |
238 | n = REF_PERIOD_PS * m * postdiv / period_ps; | |
239 | if (n < 5 || n > 256) | |
240 | continue; | |
241 | t = REF_PERIOD_PS * m * postdiv / n; | |
242 | t -= period_ps; | |
243 | if (t >= 0 && t < best_error) { | |
244 | par->pll_m = m; | |
245 | par->pll_n = n; | |
246 | par->pll_pd1 = pdiv1; | |
247 | par->pll_pd2 = pdiv2; | |
248 | best_error = t; | |
249 | } | |
250 | } | |
251 | } | |
252 | } | |
253 | if (best_error == 1000000) | |
254 | return -1; | |
255 | return 0; | |
256 | } | |
257 | ||
258 | static int calc_pixclock(struct gxt4500_par *par) | |
259 | { | |
260 | return REF_PERIOD_PS * par->pll_m * par->pll_pd1 * par->pll_pd2 | |
261 | / par->pll_n; | |
262 | } | |
263 | ||
264 | static int gxt4500_var_to_par(struct fb_var_screeninfo *var, | |
265 | struct gxt4500_par *par) | |
266 | { | |
267 | if (var->xres + var->xoffset > var->xres_virtual || | |
268 | var->yres + var->yoffset > var->yres_virtual || | |
269 | var->xres_virtual > 4096) | |
270 | return -EINVAL; | |
271 | if ((var->vmode & FB_VMODE_MASK) != FB_VMODE_NONINTERLACED) | |
272 | return -EINVAL; | |
273 | ||
274 | if (calc_pll(var->pixclock, par) < 0) | |
275 | return -EINVAL; | |
276 | ||
277 | switch (var->bits_per_pixel) { | |
278 | case 32: | |
279 | if (var->transp.length) | |
280 | par->pixfmt = DFA_PIX_32BIT; | |
281 | else | |
282 | par->pixfmt = DFA_PIX_24BIT; | |
283 | break; | |
284 | case 24: | |
285 | par->pixfmt = DFA_PIX_24BIT; | |
286 | break; | |
287 | case 16: | |
288 | if (var->green.length == 5) | |
289 | par->pixfmt = DFA_PIX_16BIT_1555; | |
290 | else | |
291 | par->pixfmt = DFA_PIX_16BIT_565; | |
292 | break; | |
293 | case 8: | |
294 | par->pixfmt = DFA_PIX_8BIT; | |
295 | break; | |
296 | default: | |
297 | return -EINVAL; | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | ||
303 | static const struct fb_bitfield eightbits = {0, 8}; | |
304 | static const struct fb_bitfield nobits = {0, 0}; | |
305 | ||
306 | static void gxt4500_unpack_pixfmt(struct fb_var_screeninfo *var, | |
307 | int pixfmt) | |
308 | { | |
309 | var->bits_per_pixel = pixsize[pixfmt] * 8; | |
310 | var->red = eightbits; | |
311 | var->green = eightbits; | |
312 | var->blue = eightbits; | |
313 | var->transp = nobits; | |
314 | ||
315 | switch (pixfmt) { | |
316 | case DFA_PIX_16BIT_565: | |
317 | var->red.length = 5; | |
318 | var->green.length = 6; | |
319 | var->blue.length = 5; | |
320 | break; | |
321 | case DFA_PIX_16BIT_1555: | |
322 | var->red.length = 5; | |
323 | var->green.length = 5; | |
324 | var->blue.length = 5; | |
325 | var->transp.length = 1; | |
326 | break; | |
327 | case DFA_PIX_32BIT: | |
328 | var->transp.length = 8; | |
329 | break; | |
330 | } | |
331 | if (pixfmt != DFA_PIX_8BIT) { | |
332 | var->green.offset = var->red.length; | |
333 | var->blue.offset = var->green.offset + var->green.length; | |
334 | if (var->transp.length) | |
335 | var->transp.offset = | |
336 | var->blue.offset + var->blue.length; | |
337 | } | |
338 | } | |
339 | ||
340 | static int gxt4500_check_var(struct fb_var_screeninfo *var, | |
341 | struct fb_info *info) | |
342 | { | |
343 | struct gxt4500_par par; | |
344 | int err; | |
345 | ||
346 | par = *(struct gxt4500_par *)info->par; | |
347 | err = gxt4500_var_to_par(var, &par); | |
348 | if (!err) { | |
349 | var->pixclock = calc_pixclock(&par); | |
350 | gxt4500_unpack_pixfmt(var, par.pixfmt); | |
351 | } | |
352 | return err; | |
353 | } | |
354 | ||
355 | static int gxt4500_set_par(struct fb_info *info) | |
356 | { | |
357 | struct gxt4500_par *par = info->par; | |
358 | struct fb_var_screeninfo *var = &info->var; | |
359 | int err; | |
360 | u32 ctrlreg; | |
361 | unsigned int dfa_ctl, pixfmt, stride; | |
362 | unsigned int wid_tiles, i; | |
363 | unsigned int prefetch_pix, htot; | |
364 | struct gxt4500_par save_par; | |
365 | ||
366 | save_par = *par; | |
367 | err = gxt4500_var_to_par(var, par); | |
368 | if (err) { | |
369 | *par = save_par; | |
370 | return err; | |
371 | } | |
372 | ||
373 | /* turn off DTG for now */ | |
374 | ctrlreg = readreg(par, DTG_CONTROL); | |
375 | ctrlreg &= ~(DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH); | |
376 | writereg(par, DTG_CONTROL, ctrlreg); | |
377 | ||
378 | /* set PLL registers */ | |
379 | writereg(par, PLL_M, mdivtab[par->pll_m - 1]); | |
380 | writereg(par, PLL_N, ndivtab[par->pll_n - 2]); | |
381 | writereg(par, PLL_POSTDIV, | |
382 | ((8 - par->pll_pd1) << 3) | (8 - par->pll_pd2)); | |
383 | msleep(20); | |
384 | ||
385 | /* turn off hardware cursor */ | |
386 | writereg(par, CURSOR_MODE, CURSOR_MODE_OFF); | |
387 | ||
388 | /* reset raster engine */ | |
389 | writereg(par, CTRL_REG0, CR0_RASTER_RESET | (CR0_RASTER_RESET << 16)); | |
390 | udelay(10); | |
391 | writereg(par, CTRL_REG0, CR0_RASTER_RESET << 16); | |
392 | ||
393 | /* set display timing generator registers */ | |
394 | htot = var->xres + var->left_margin + var->right_margin + | |
395 | var->hsync_len; | |
396 | writereg(par, DTG_HORIZ_EXTENT, htot - 1); | |
397 | writereg(par, DTG_HORIZ_DISPLAY, var->xres - 1); | |
398 | writereg(par, DTG_HSYNC_START, var->xres + var->right_margin - 1); | |
399 | writereg(par, DTG_HSYNC_END, | |
400 | var->xres + var->right_margin + var->hsync_len - 1); | |
401 | writereg(par, DTG_HSYNC_END_COMP, | |
402 | var->xres + var->right_margin + var->hsync_len - 1); | |
403 | writereg(par, DTG_VERT_EXTENT, | |
404 | var->yres + var->upper_margin + var->lower_margin + | |
405 | var->vsync_len - 1); | |
406 | writereg(par, DTG_VERT_DISPLAY, var->yres - 1); | |
407 | writereg(par, DTG_VSYNC_START, var->yres + var->lower_margin - 1); | |
408 | writereg(par, DTG_VSYNC_END, | |
409 | var->yres + var->lower_margin + var->vsync_len - 1); | |
410 | prefetch_pix = 3300000 / var->pixclock; | |
411 | if (prefetch_pix >= htot) | |
412 | prefetch_pix = htot - 1; | |
413 | writereg(par, DTG_VERT_SHORT, htot - prefetch_pix - 1); | |
414 | ctrlreg |= DTG_CTL_ENABLE | DTG_CTL_SCREEN_REFRESH; | |
415 | writereg(par, DTG_CONTROL, ctrlreg); | |
416 | ||
417 | /* calculate stride in DFA aperture */ | |
418 | if (var->xres_virtual > 2048) { | |
419 | stride = 4096; | |
420 | dfa_ctl = DFA_FB_STRIDE_4k; | |
421 | } else if (var->xres_virtual > 1024) { | |
422 | stride = 2048; | |
423 | dfa_ctl = DFA_FB_STRIDE_2k; | |
424 | } else { | |
425 | stride = 1024; | |
426 | dfa_ctl = DFA_FB_STRIDE_1k; | |
427 | } | |
428 | ||
429 | /* Set up framebuffer definition */ | |
430 | wid_tiles = (var->xres_virtual + 63) >> 6; | |
431 | ||
432 | /* XXX add proper FB allocation here someday */ | |
433 | writereg(par, FB_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); | |
434 | writereg(par, REFRESH_AB_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); | |
435 | writereg(par, FB_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); | |
436 | writereg(par, REFRESH_CD_CTRL, FB_CTRL_TYPE | (wid_tiles << 16) | 0); | |
437 | writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset); | |
438 | writereg(par, REFRESH_SIZE, (var->xres << 16) | var->yres); | |
439 | ||
440 | /* Set up framebuffer access by CPU */ | |
441 | ||
442 | pixfmt = par->pixfmt; | |
443 | dfa_ctl |= DFA_FB_ENABLE | pixfmt; | |
444 | writereg(par, DFA_FB_A, dfa_ctl); | |
445 | ||
446 | /* | |
447 | * Set up window attribute table. | |
448 | * We set all WAT entries the same so it doesn't matter what the | |
449 | * window ID (WID) plane contains. | |
450 | */ | |
451 | for (i = 0; i < 32; ++i) { | |
452 | writereg(par, WAT_FMT + (i << 4), watfmt[pixfmt]); | |
453 | writereg(par, WAT_CMAP_OFFSET + (i << 4), 0); | |
454 | writereg(par, WAT_CTRL + (i << 4), 0); | |
455 | writereg(par, WAT_GAMMA_CTRL + (i << 4), WAT_GAMMA_DISABLE); | |
456 | } | |
457 | ||
458 | /* Set sync polarity etc. */ | |
459 | ctrlreg = readreg(par, SYNC_CTL) & | |
460 | ~(SYNC_CTL_SYNC_ON_RGB | SYNC_CTL_HSYNC_INV | | |
461 | SYNC_CTL_VSYNC_INV); | |
462 | if (var->sync & FB_SYNC_ON_GREEN) | |
463 | ctrlreg |= SYNC_CTL_SYNC_ON_RGB; | |
464 | if (!(var->sync & FB_SYNC_HOR_HIGH_ACT)) | |
465 | ctrlreg |= SYNC_CTL_HSYNC_INV; | |
466 | if (!(var->sync & FB_SYNC_VERT_HIGH_ACT)) | |
467 | ctrlreg |= SYNC_CTL_VSYNC_INV; | |
468 | writereg(par, SYNC_CTL, ctrlreg); | |
469 | ||
470 | info->fix.line_length = stride * pixsize[pixfmt]; | |
471 | info->fix.visual = (pixfmt == DFA_PIX_8BIT)? FB_VISUAL_PSEUDOCOLOR: | |
472 | FB_VISUAL_DIRECTCOLOR; | |
473 | ||
474 | return 0; | |
475 | } | |
476 | ||
477 | static int gxt4500_setcolreg(unsigned int reg, unsigned int red, | |
478 | unsigned int green, unsigned int blue, | |
479 | unsigned int transp, struct fb_info *info) | |
480 | { | |
481 | u32 cmap_entry; | |
482 | struct gxt4500_par *par = info->par; | |
483 | ||
484 | if (reg > 1023) | |
485 | return 1; | |
486 | cmap_entry = ((transp & 0xff00) << 16) | ((blue & 0xff00) << 8) | | |
487 | (green & 0xff00) | (red >> 8); | |
488 | writereg(par, CMAP + reg * 4, cmap_entry); | |
489 | ||
490 | if (reg < 16 && par->pixfmt != DFA_PIX_8BIT) { | |
491 | u32 *pal = info->pseudo_palette; | |
492 | u32 val = reg; | |
493 | switch (par->pixfmt) { | |
494 | case DFA_PIX_16BIT_565: | |
495 | val |= (reg << 11) | (reg << 6); | |
496 | break; | |
497 | case DFA_PIX_16BIT_1555: | |
498 | val |= (reg << 10) | (reg << 5); | |
499 | break; | |
500 | case DFA_PIX_32BIT: | |
501 | val |= (reg << 24); | |
502 | /* fall through */ | |
503 | case DFA_PIX_24BIT: | |
504 | val |= (reg << 16) | (reg << 8); | |
505 | break; | |
506 | } | |
507 | pal[reg] = val; | |
508 | } | |
509 | ||
510 | return 0; | |
511 | } | |
512 | ||
513 | static int gxt4500_pan_display(struct fb_var_screeninfo *var, | |
514 | struct fb_info *info) | |
515 | { | |
516 | struct gxt4500_par *par = info->par; | |
517 | ||
518 | if (var->xoffset & 7) | |
519 | return -EINVAL; | |
520 | if (var->xoffset + var->xres > var->xres_virtual || | |
521 | var->yoffset + var->yres > var->yres_virtual) | |
522 | return -EINVAL; | |
523 | ||
524 | writereg(par, REFRESH_START, (var->xoffset << 16) | var->yoffset); | |
525 | return 0; | |
526 | } | |
527 | ||
528 | static int gxt4500_blank(int blank, struct fb_info *info) | |
529 | { | |
530 | struct gxt4500_par *par = info->par; | |
531 | int ctrl, dctl; | |
532 | ||
533 | ctrl = readreg(par, SYNC_CTL); | |
534 | ctrl &= ~(SYNC_CTL_SYNC_OFF | SYNC_CTL_HSYNC_OFF | SYNC_CTL_VSYNC_OFF); | |
535 | dctl = readreg(par, DISP_CTL); | |
536 | dctl |= DISP_CTL_OFF; | |
537 | switch (blank) { | |
538 | case FB_BLANK_UNBLANK: | |
539 | dctl &= ~DISP_CTL_OFF; | |
540 | break; | |
541 | case FB_BLANK_POWERDOWN: | |
542 | ctrl |= SYNC_CTL_SYNC_OFF; | |
543 | break; | |
544 | case FB_BLANK_HSYNC_SUSPEND: | |
545 | ctrl |= SYNC_CTL_HSYNC_OFF; | |
546 | break; | |
547 | case FB_BLANK_VSYNC_SUSPEND: | |
548 | ctrl |= SYNC_CTL_VSYNC_OFF; | |
549 | break; | |
550 | default: ; | |
551 | } | |
552 | writereg(par, SYNC_CTL, ctrl); | |
553 | writereg(par, DISP_CTL, dctl); | |
554 | ||
555 | return 0; | |
556 | } | |
557 | ||
558 | static const struct fb_fix_screeninfo gxt4500_fix __devinitdata = { | |
559 | .id = "IBM GXT4500P", | |
560 | .type = FB_TYPE_PACKED_PIXELS, | |
561 | .visual = FB_VISUAL_PSEUDOCOLOR, | |
562 | .xpanstep = 8, | |
563 | .ypanstep = 1, | |
564 | .mmio_len = 0x20000, | |
565 | }; | |
566 | ||
567 | static struct fb_ops gxt4500_ops = { | |
568 | .owner = THIS_MODULE, | |
569 | .fb_check_var = gxt4500_check_var, | |
570 | .fb_set_par = gxt4500_set_par, | |
571 | .fb_setcolreg = gxt4500_setcolreg, | |
572 | .fb_pan_display = gxt4500_pan_display, | |
573 | .fb_blank = gxt4500_blank, | |
574 | .fb_fillrect = cfb_fillrect, | |
575 | .fb_copyarea = cfb_copyarea, | |
576 | .fb_imageblit = cfb_imageblit, | |
577 | }; | |
578 | ||
579 | /* PCI functions */ | |
580 | static int __devinit gxt4500_probe(struct pci_dev *pdev, | |
581 | const struct pci_device_id *ent) | |
582 | { | |
583 | int err; | |
584 | unsigned long reg_phys, fb_phys; | |
585 | struct gxt4500_par *par; | |
586 | struct fb_info *info; | |
587 | struct fb_var_screeninfo var; | |
588 | ||
589 | err = pci_enable_device(pdev); | |
590 | if (err) { | |
591 | dev_err(&pdev->dev, "gxt4500: cannot enable PCI device: %d\n", | |
592 | err); | |
593 | return err; | |
594 | } | |
595 | ||
596 | reg_phys = pci_resource_start(pdev, 0); | |
597 | if (!request_mem_region(reg_phys, pci_resource_len(pdev, 0), | |
598 | "gxt4500 regs")) { | |
599 | dev_err(&pdev->dev, "gxt4500: cannot get registers\n"); | |
600 | goto err_nodev; | |
601 | } | |
602 | ||
603 | fb_phys = pci_resource_start(pdev, 1); | |
604 | if (!request_mem_region(fb_phys, pci_resource_len(pdev, 1), | |
605 | "gxt4500 FB")) { | |
606 | dev_err(&pdev->dev, "gxt4500: cannot get framebuffer\n"); | |
607 | goto err_free_regs; | |
608 | } | |
609 | ||
610 | info = framebuffer_alloc(sizeof(struct gxt4500_par), &pdev->dev); | |
611 | if (!info) { | |
612 | dev_err(&pdev->dev, "gxt4500: cannot alloc FB info record"); | |
613 | goto err_free_fb; | |
614 | } | |
615 | par = info->par; | |
616 | info->fix = gxt4500_fix; | |
617 | info->pseudo_palette = par->pseudo_palette; | |
618 | ||
619 | info->fix.mmio_start = reg_phys; | |
620 | par->regs = ioremap(reg_phys, pci_resource_len(pdev, 0)); | |
621 | if (!par->regs) { | |
622 | dev_err(&pdev->dev, "gxt4500: cannot map registers\n"); | |
623 | goto err_free_all; | |
624 | } | |
625 | ||
626 | info->fix.smem_start = fb_phys; | |
627 | info->fix.smem_len = pci_resource_len(pdev, 1); | |
628 | info->screen_base = ioremap(fb_phys, pci_resource_len(pdev, 1)); | |
629 | if (!info->screen_base) { | |
630 | dev_err(&pdev->dev, "gxt4500: cannot map framebuffer\n"); | |
631 | goto err_unmap_regs; | |
632 | } | |
633 | ||
634 | pci_set_drvdata(pdev, info); | |
635 | ||
636 | /* Set byte-swapping for DFA aperture for all pixel sizes */ | |
637 | pci_write_config_dword(pdev, CFG_ENDIAN0, 0x333300); | |
638 | ||
639 | info->fbops = &gxt4500_ops; | |
640 | info->flags = FBINFO_FLAG_DEFAULT; | |
641 | ||
642 | err = fb_alloc_cmap(&info->cmap, 256, 0); | |
643 | if (err) { | |
644 | dev_err(&pdev->dev, "gxt4500: cannot allocate cmap\n"); | |
645 | goto err_unmap_all; | |
646 | } | |
647 | ||
648 | gxt4500_blank(FB_BLANK_UNBLANK, info); | |
649 | ||
650 | if (!fb_find_mode(&var, info, mode_option, NULL, 0, &defaultmode, 8)) { | |
651 | dev_err(&pdev->dev, "gxt4500: cannot find valid video mode\n"); | |
652 | goto err_free_cmap; | |
653 | } | |
654 | info->var = var; | |
655 | if (gxt4500_set_par(info)) { | |
656 | printk(KERN_ERR "gxt4500: cannot set video mode\n"); | |
657 | goto err_free_cmap; | |
658 | } | |
659 | ||
660 | if (register_framebuffer(info) < 0) { | |
661 | dev_err(&pdev->dev, "gxt4500: cannot register framebuffer\n"); | |
662 | goto err_free_cmap; | |
663 | } | |
664 | printk(KERN_INFO "fb%d: %s frame buffer device\n", | |
665 | info->node, info->fix.id); | |
666 | ||
667 | return 0; | |
668 | ||
669 | err_free_cmap: | |
670 | fb_dealloc_cmap(&info->cmap); | |
671 | err_unmap_all: | |
672 | iounmap(info->screen_base); | |
673 | err_unmap_regs: | |
674 | iounmap(par->regs); | |
675 | err_free_all: | |
676 | framebuffer_release(info); | |
677 | err_free_fb: | |
678 | release_mem_region(fb_phys, pci_resource_len(pdev, 1)); | |
679 | err_free_regs: | |
680 | release_mem_region(reg_phys, pci_resource_len(pdev, 0)); | |
681 | err_nodev: | |
682 | return -ENODEV; | |
683 | } | |
684 | ||
685 | static void __devexit gxt4500_remove(struct pci_dev *pdev) | |
686 | { | |
687 | struct fb_info *info = pci_get_drvdata(pdev); | |
688 | struct gxt4500_par *par; | |
689 | ||
690 | if (!info) | |
691 | return; | |
692 | par = info->par; | |
693 | unregister_framebuffer(info); | |
694 | fb_dealloc_cmap(&info->cmap); | |
695 | iounmap(par->regs); | |
696 | iounmap(info->screen_base); | |
697 | release_mem_region(pci_resource_start(pdev, 0), | |
698 | pci_resource_len(pdev, 0)); | |
699 | release_mem_region(pci_resource_start(pdev, 1), | |
700 | pci_resource_len(pdev, 1)); | |
701 | framebuffer_release(info); | |
702 | } | |
703 | ||
704 | /* supported chipsets */ | |
705 | static const struct pci_device_id gxt4500_pci_tbl[] = { | |
706 | { PCI_VENDOR_ID_IBM, PCI_DEVICE_ID_IBM_GXT4500P, | |
707 | PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 }, | |
708 | { 0 } | |
709 | }; | |
710 | ||
711 | MODULE_DEVICE_TABLE(pci, gxt4500_pci_tbl); | |
712 | ||
713 | static struct pci_driver gxt4500_driver = { | |
714 | .name = "gxt4500", | |
715 | .id_table = gxt4500_pci_tbl, | |
716 | .probe = gxt4500_probe, | |
717 | .remove = __devexit_p(gxt4500_remove), | |
718 | }; | |
719 | ||
720 | static int __devinit gxt4500_init(void) | |
721 | { | |
722 | #ifndef MODULE | |
723 | if (fb_get_options("gxt4500", &mode_option)) | |
724 | return -ENODEV; | |
725 | #endif | |
726 | ||
727 | return pci_register_driver(&gxt4500_driver); | |
728 | } | |
729 | module_init(gxt4500_init); | |
730 | ||
731 | static void __exit gxt4500_exit(void) | |
732 | { | |
733 | pci_unregister_driver(&gxt4500_driver); | |
734 | } | |
735 | module_exit(gxt4500_exit); | |
736 | ||
737 | MODULE_AUTHOR("Paul Mackerras <paulus@samba.org>"); | |
738 | MODULE_DESCRIPTION("FBDev driver for IBM GXT4500P"); | |
739 | MODULE_LICENSE("GPL"); | |
740 | module_param(mode_option, charp, 0); | |
741 | MODULE_PARM_DESC(mode_option, "Specify resolution as \"<xres>x<yres>[-<bpp>][@<refresh>]\""); |