xref: /openbmc/linux/drivers/video/fbdev/s3fb.c (revision 48ca54e3)
1 /*
2  * linux/drivers/video/s3fb.c -- Frame buffer device driver for S3 Trio/Virge
3  *
4  * Copyright (c) 2006-2007 Ondrej Zajicek <santiago@crfreenet.org>
5  *
6  * This file is subject to the terms and conditions of the GNU General Public
7  * License.  See the file COPYING in the main directory of this archive for
8  * more details.
9  *
10  * Code is based on David Boucher's viafb (http://davesdomain.org.uk/viafb/)
11  * which is based on the code of neofb.
12  */
13 
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/errno.h>
17 #include <linux/string.h>
18 #include <linux/mm.h>
19 #include <linux/tty.h>
20 #include <linux/delay.h>
21 #include <linux/fb.h>
22 #include <linux/svga.h>
23 #include <linux/init.h>
24 #include <linux/pci.h>
25 #include <linux/console.h> /* Why should fb driver call console functions? because console_lock() */
26 #include <video/vga.h>
27 
28 #include <linux/i2c.h>
29 #include <linux/i2c-algo-bit.h>
30 
31 struct s3fb_info {
32 	int chip, rev, mclk_freq;
33 	int wc_cookie;
34 	struct vgastate state;
35 	struct mutex open_lock;
36 	unsigned int ref_count;
37 	u32 pseudo_palette[16];
38 #ifdef CONFIG_FB_S3_DDC
39 	u8 __iomem *mmio;
40 	bool ddc_registered;
41 	struct i2c_adapter ddc_adapter;
42 	struct i2c_algo_bit_data ddc_algo;
43 #endif
44 };
45 
46 
47 /* ------------------------------------------------------------------------- */
48 
49 static const struct svga_fb_format s3fb_formats[] = {
50 	{ 0,  {0, 6, 0},  {0, 6, 0},  {0, 6, 0}, {0, 0, 0}, 0,
51 		FB_TYPE_TEXT, FB_AUX_TEXT_SVGA_STEP4,	FB_VISUAL_PSEUDOCOLOR, 8, 16},
52 	{ 4,  {0, 4, 0},  {0, 4, 0},  {0, 4, 0}, {0, 0, 0}, 0,
53 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_PSEUDOCOLOR, 8, 16},
54 	{ 4,  {0, 4, 0},  {0, 4, 0},  {0, 4, 0}, {0, 0, 0}, 1,
55 		FB_TYPE_INTERLEAVED_PLANES, 1,		FB_VISUAL_PSEUDOCOLOR, 8, 16},
56 	{ 8,  {0, 8, 0},  {0, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
57 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_PSEUDOCOLOR, 4, 8},
58 	{16,  {10, 5, 0}, {5, 5, 0},  {0, 5, 0}, {0, 0, 0}, 0,
59 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 2, 4},
60 	{16,  {11, 5, 0}, {5, 6, 0},  {0, 5, 0}, {0, 0, 0}, 0,
61 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 2, 4},
62 	{24,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
63 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 1, 2},
64 	{32,  {16, 8, 0}, {8, 8, 0},  {0, 8, 0}, {0, 0, 0}, 0,
65 		FB_TYPE_PACKED_PIXELS, 0,		FB_VISUAL_TRUECOLOR, 1, 2},
66 	SVGA_FORMAT_END
67 };
68 
69 
70 static const struct svga_pll s3_pll = {3, 129, 3, 33, 0, 3,
71 	35000, 240000, 14318};
72 static const struct svga_pll s3_trio3d_pll = {3, 129, 3, 31, 0, 4,
73 	230000, 460000, 14318};
74 
75 static const int s3_memsizes[] = {4096, 0, 3072, 8192, 2048, 6144, 1024, 512};
76 
77 static const char * const s3_names[] = {"S3 Unknown", "S3 Trio32", "S3 Trio64", "S3 Trio64V+",
78 			"S3 Trio64UV+", "S3 Trio64V2/DX", "S3 Trio64V2/GX",
79 			"S3 Plato/PX", "S3 Aurora64V+", "S3 Virge",
80 			"S3 Virge/VX", "S3 Virge/DX", "S3 Virge/GX",
81 			"S3 Virge/GX2", "S3 Virge/GX2+", "",
82 			"S3 Trio3D/1X", "S3 Trio3D/2X", "S3 Trio3D/2X",
83 			"S3 Trio3D", "S3 Virge/MX"};
84 
85 #define CHIP_UNKNOWN		0x00
86 #define CHIP_732_TRIO32		0x01
87 #define CHIP_764_TRIO64		0x02
88 #define CHIP_765_TRIO64VP	0x03
89 #define CHIP_767_TRIO64UVP	0x04
90 #define CHIP_775_TRIO64V2_DX	0x05
91 #define CHIP_785_TRIO64V2_GX	0x06
92 #define CHIP_551_PLATO_PX	0x07
93 #define CHIP_M65_AURORA64VP	0x08
94 #define CHIP_325_VIRGE		0x09
95 #define CHIP_988_VIRGE_VX	0x0A
96 #define CHIP_375_VIRGE_DX	0x0B
97 #define CHIP_385_VIRGE_GX	0x0C
98 #define CHIP_357_VIRGE_GX2	0x0D
99 #define CHIP_359_VIRGE_GX2P	0x0E
100 #define CHIP_360_TRIO3D_1X	0x10
101 #define CHIP_362_TRIO3D_2X	0x11
102 #define CHIP_368_TRIO3D_2X	0x12
103 #define CHIP_365_TRIO3D		0x13
104 #define CHIP_260_VIRGE_MX	0x14
105 
106 #define CHIP_XXX_TRIO		0x80
107 #define CHIP_XXX_TRIO64V2_DXGX	0x81
108 #define CHIP_XXX_VIRGE_DXGX	0x82
109 #define CHIP_36X_TRIO3D_1X_2X	0x83
110 
111 #define CHIP_UNDECIDED_FLAG	0x80
112 #define CHIP_MASK		0xFF
113 
114 #define MMIO_OFFSET		0x1000000
115 #define MMIO_SIZE		0x10000
116 
117 /* CRT timing register sets */
118 
119 static const struct vga_regset s3_h_total_regs[]        = {{0x00, 0, 7}, {0x5D, 0, 0}, VGA_REGSET_END};
120 static const struct vga_regset s3_h_display_regs[]      = {{0x01, 0, 7}, {0x5D, 1, 1}, VGA_REGSET_END};
121 static const struct vga_regset s3_h_blank_start_regs[]  = {{0x02, 0, 7}, {0x5D, 2, 2}, VGA_REGSET_END};
122 static const struct vga_regset s3_h_blank_end_regs[]    = {{0x03, 0, 4}, {0x05, 7, 7}, VGA_REGSET_END};
123 static const struct vga_regset s3_h_sync_start_regs[]   = {{0x04, 0, 7}, {0x5D, 4, 4}, VGA_REGSET_END};
124 static const struct vga_regset s3_h_sync_end_regs[]     = {{0x05, 0, 4}, VGA_REGSET_END};
125 
126 static const struct vga_regset s3_v_total_regs[]        = {{0x06, 0, 7}, {0x07, 0, 0}, {0x07, 5, 5}, {0x5E, 0, 0}, VGA_REGSET_END};
127 static const struct vga_regset s3_v_display_regs[]      = {{0x12, 0, 7}, {0x07, 1, 1}, {0x07, 6, 6}, {0x5E, 1, 1}, VGA_REGSET_END};
128 static const struct vga_regset s3_v_blank_start_regs[]  = {{0x15, 0, 7}, {0x07, 3, 3}, {0x09, 5, 5}, {0x5E, 2, 2}, VGA_REGSET_END};
129 static const struct vga_regset s3_v_blank_end_regs[]    = {{0x16, 0, 7}, VGA_REGSET_END};
130 static const struct vga_regset s3_v_sync_start_regs[]   = {{0x10, 0, 7}, {0x07, 2, 2}, {0x07, 7, 7}, {0x5E, 4, 4}, VGA_REGSET_END};
131 static const struct vga_regset s3_v_sync_end_regs[]     = {{0x11, 0, 3}, VGA_REGSET_END};
132 
133 static const struct vga_regset s3_line_compare_regs[]   = {{0x18, 0, 7}, {0x07, 4, 4}, {0x09, 6, 6}, {0x5E, 6, 6}, VGA_REGSET_END};
134 static const struct vga_regset s3_start_address_regs[]  = {{0x0d, 0, 7}, {0x0c, 0, 7}, {0x69, 0, 4}, VGA_REGSET_END};
135 static const struct vga_regset s3_offset_regs[]         = {{0x13, 0, 7}, {0x51, 4, 5}, VGA_REGSET_END}; /* set 0x43 bit 2 to 0 */
136 
137 static const struct vga_regset s3_dtpc_regs[]		= {{0x3B, 0, 7}, {0x5D, 6, 6}, VGA_REGSET_END};
138 
139 static const struct svga_timing_regs s3_timing_regs     = {
140 	s3_h_total_regs, s3_h_display_regs, s3_h_blank_start_regs,
141 	s3_h_blank_end_regs, s3_h_sync_start_regs, s3_h_sync_end_regs,
142 	s3_v_total_regs, s3_v_display_regs, s3_v_blank_start_regs,
143 	s3_v_blank_end_regs, s3_v_sync_start_regs, s3_v_sync_end_regs,
144 };
145 
146 
147 /* ------------------------------------------------------------------------- */
148 
149 /* Module parameters */
150 
151 
152 static char *mode_option;
153 static int mtrr = 1;
154 static int fasttext = 1;
155 
156 
157 MODULE_AUTHOR("(c) 2006-2007 Ondrej Zajicek <santiago@crfreenet.org>");
158 MODULE_LICENSE("GPL");
159 MODULE_DESCRIPTION("fbdev driver for S3 Trio/Virge");
160 
161 module_param(mode_option, charp, 0444);
162 MODULE_PARM_DESC(mode_option, "Default video mode ('640x480-8@60', etc)");
163 module_param_named(mode, mode_option, charp, 0444);
164 MODULE_PARM_DESC(mode, "Default video mode ('640x480-8@60', etc) (deprecated)");
165 module_param(mtrr, int, 0444);
166 MODULE_PARM_DESC(mtrr, "Enable write-combining with MTRR (1=enable, 0=disable, default=1)");
167 
168 module_param(fasttext, int, 0644);
169 MODULE_PARM_DESC(fasttext, "Enable S3 fast text mode (1=enable, 0=disable, default=1)");
170 
171 
172 /* ------------------------------------------------------------------------- */
173 
174 #ifdef CONFIG_FB_S3_DDC
175 
176 #define DDC_REG		0xaa		/* Trio 3D/1X/2X */
177 #define DDC_MMIO_REG	0xff20		/* all other chips */
178 #define DDC_SCL_OUT	(1 << 0)
179 #define DDC_SDA_OUT	(1 << 1)
180 #define DDC_SCL_IN	(1 << 2)
181 #define DDC_SDA_IN	(1 << 3)
182 #define DDC_DRIVE_EN	(1 << 4)
183 
184 static bool s3fb_ddc_needs_mmio(int chip)
185 {
186 	return !(chip == CHIP_360_TRIO3D_1X  ||
187 		 chip == CHIP_362_TRIO3D_2X  ||
188 		 chip == CHIP_368_TRIO3D_2X);
189 }
190 
191 static u8 s3fb_ddc_read(struct s3fb_info *par)
192 {
193 	if (s3fb_ddc_needs_mmio(par->chip))
194 		return readb(par->mmio + DDC_MMIO_REG);
195 	else
196 		return vga_rcrt(par->state.vgabase, DDC_REG);
197 }
198 
199 static void s3fb_ddc_write(struct s3fb_info *par, u8 val)
200 {
201 	if (s3fb_ddc_needs_mmio(par->chip))
202 		writeb(val, par->mmio + DDC_MMIO_REG);
203 	else
204 		vga_wcrt(par->state.vgabase, DDC_REG, val);
205 }
206 
207 static void s3fb_ddc_setscl(void *data, int val)
208 {
209 	struct s3fb_info *par = data;
210 	unsigned char reg;
211 
212 	reg = s3fb_ddc_read(par) | DDC_DRIVE_EN;
213 	if (val)
214 		reg |= DDC_SCL_OUT;
215 	else
216 		reg &= ~DDC_SCL_OUT;
217 	s3fb_ddc_write(par, reg);
218 }
219 
220 static void s3fb_ddc_setsda(void *data, int val)
221 {
222 	struct s3fb_info *par = data;
223 	unsigned char reg;
224 
225 	reg = s3fb_ddc_read(par) | DDC_DRIVE_EN;
226 	if (val)
227 		reg |= DDC_SDA_OUT;
228 	else
229 		reg &= ~DDC_SDA_OUT;
230 	s3fb_ddc_write(par, reg);
231 }
232 
233 static int s3fb_ddc_getscl(void *data)
234 {
235 	struct s3fb_info *par = data;
236 
237 	return !!(s3fb_ddc_read(par) & DDC_SCL_IN);
238 }
239 
240 static int s3fb_ddc_getsda(void *data)
241 {
242 	struct s3fb_info *par = data;
243 
244 	return !!(s3fb_ddc_read(par) & DDC_SDA_IN);
245 }
246 
247 static int s3fb_setup_ddc_bus(struct fb_info *info)
248 {
249 	struct s3fb_info *par = info->par;
250 
251 	strlcpy(par->ddc_adapter.name, info->fix.id,
252 		sizeof(par->ddc_adapter.name));
253 	par->ddc_adapter.owner		= THIS_MODULE;
254 	par->ddc_adapter.class		= I2C_CLASS_DDC;
255 	par->ddc_adapter.algo_data	= &par->ddc_algo;
256 	par->ddc_adapter.dev.parent	= info->device;
257 	par->ddc_algo.setsda		= s3fb_ddc_setsda;
258 	par->ddc_algo.setscl		= s3fb_ddc_setscl;
259 	par->ddc_algo.getsda		= s3fb_ddc_getsda;
260 	par->ddc_algo.getscl		= s3fb_ddc_getscl;
261 	par->ddc_algo.udelay		= 10;
262 	par->ddc_algo.timeout		= 20;
263 	par->ddc_algo.data		= par;
264 
265 	i2c_set_adapdata(&par->ddc_adapter, par);
266 
267 	/*
268 	 * some Virge cards have external MUX to switch chip I2C bus between
269 	 * DDC and extension pins - switch it do DDC
270 	 */
271 /*	vga_wseq(par->state.vgabase, 0x08, 0x06); - not needed, already unlocked */
272 	if (par->chip == CHIP_357_VIRGE_GX2 ||
273 	    par->chip == CHIP_359_VIRGE_GX2P ||
274 	    par->chip == CHIP_260_VIRGE_MX)
275 		svga_wseq_mask(par->state.vgabase, 0x0d, 0x01, 0x03);
276 	else
277 		svga_wseq_mask(par->state.vgabase, 0x0d, 0x00, 0x03);
278 	/* some Virge need this or the DDC is ignored */
279 	svga_wcrt_mask(par->state.vgabase, 0x5c, 0x03, 0x03);
280 
281 	return i2c_bit_add_bus(&par->ddc_adapter);
282 }
283 #endif /* CONFIG_FB_S3_DDC */
284 
285 
286 /* ------------------------------------------------------------------------- */
287 
288 /* Set font in S3 fast text mode */
289 
290 static void s3fb_settile_fast(struct fb_info *info, struct fb_tilemap *map)
291 {
292 	const u8 *font = map->data;
293 	u8 __iomem *fb = (u8 __iomem *) info->screen_base;
294 	int i, c;
295 
296 	if ((map->width != 8) || (map->height != 16) ||
297 	    (map->depth != 1) || (map->length != 256)) {
298 		fb_err(info, "unsupported font parameters: width %d, height %d, depth %d, length %d\n",
299 		       map->width, map->height, map->depth, map->length);
300 		return;
301 	}
302 
303 	fb += 2;
304 	for (i = 0; i < map->height; i++) {
305 		for (c = 0; c < map->length; c++) {
306 			fb_writeb(font[c * map->height + i], fb + c * 4);
307 		}
308 		fb += 1024;
309 	}
310 }
311 
312 static void s3fb_tilecursor(struct fb_info *info, struct fb_tilecursor *cursor)
313 {
314 	struct s3fb_info *par = info->par;
315 
316 	svga_tilecursor(par->state.vgabase, info, cursor);
317 }
318 
319 static struct fb_tile_ops s3fb_tile_ops = {
320 	.fb_settile	= svga_settile,
321 	.fb_tilecopy	= svga_tilecopy,
322 	.fb_tilefill    = svga_tilefill,
323 	.fb_tileblit    = svga_tileblit,
324 	.fb_tilecursor  = s3fb_tilecursor,
325 	.fb_get_tilemax = svga_get_tilemax,
326 };
327 
328 static struct fb_tile_ops s3fb_fast_tile_ops = {
329 	.fb_settile	= s3fb_settile_fast,
330 	.fb_tilecopy	= svga_tilecopy,
331 	.fb_tilefill    = svga_tilefill,
332 	.fb_tileblit    = svga_tileblit,
333 	.fb_tilecursor  = s3fb_tilecursor,
334 	.fb_get_tilemax = svga_get_tilemax,
335 };
336 
337 
338 /* ------------------------------------------------------------------------- */
339 
340 /* image data is MSB-first, fb structure is MSB-first too */
341 static inline u32 expand_color(u32 c)
342 {
343 	return ((c & 1) | ((c & 2) << 7) | ((c & 4) << 14) | ((c & 8) << 21)) * 0xFF;
344 }
345 
346 /* s3fb_iplan_imageblit silently assumes that almost everything is 8-pixel aligned */
347 static void s3fb_iplan_imageblit(struct fb_info *info, const struct fb_image *image)
348 {
349 	u32 fg = expand_color(image->fg_color);
350 	u32 bg = expand_color(image->bg_color);
351 	const u8 *src1, *src;
352 	u8 __iomem *dst1;
353 	u32 __iomem *dst;
354 	u32 val;
355 	int x, y;
356 
357 	src1 = image->data;
358 	dst1 = info->screen_base + (image->dy * info->fix.line_length)
359 		 + ((image->dx / 8) * 4);
360 
361 	for (y = 0; y < image->height; y++) {
362 		src = src1;
363 		dst = (u32 __iomem *) dst1;
364 		for (x = 0; x < image->width; x += 8) {
365 			val = *(src++) * 0x01010101;
366 			val = (val & fg) | (~val & bg);
367 			fb_writel(val, dst++);
368 		}
369 		src1 += image->width / 8;
370 		dst1 += info->fix.line_length;
371 	}
372 
373 }
374 
375 /* s3fb_iplan_fillrect silently assumes that almost everything is 8-pixel aligned */
376 static void s3fb_iplan_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
377 {
378 	u32 fg = expand_color(rect->color);
379 	u8 __iomem *dst1;
380 	u32 __iomem *dst;
381 	int x, y;
382 
383 	dst1 = info->screen_base + (rect->dy * info->fix.line_length)
384 		 + ((rect->dx / 8) * 4);
385 
386 	for (y = 0; y < rect->height; y++) {
387 		dst = (u32 __iomem *) dst1;
388 		for (x = 0; x < rect->width; x += 8) {
389 			fb_writel(fg, dst++);
390 		}
391 		dst1 += info->fix.line_length;
392 	}
393 }
394 
395 
396 /* image data is MSB-first, fb structure is high-nibble-in-low-byte-first */
397 static inline u32 expand_pixel(u32 c)
398 {
399 	return (((c &  1) << 24) | ((c &  2) << 27) | ((c &  4) << 14) | ((c &   8) << 17) |
400 		((c & 16) <<  4) | ((c & 32) <<  7) | ((c & 64) >>  6) | ((c & 128) >>  3)) * 0xF;
401 }
402 
403 /* s3fb_cfb4_imageblit silently assumes that almost everything is 8-pixel aligned */
404 static void s3fb_cfb4_imageblit(struct fb_info *info, const struct fb_image *image)
405 {
406 	u32 fg = image->fg_color * 0x11111111;
407 	u32 bg = image->bg_color * 0x11111111;
408 	const u8 *src1, *src;
409 	u8 __iomem *dst1;
410 	u32 __iomem *dst;
411 	u32 val;
412 	int x, y;
413 
414 	src1 = image->data;
415 	dst1 = info->screen_base + (image->dy * info->fix.line_length)
416 		 + ((image->dx / 8) * 4);
417 
418 	for (y = 0; y < image->height; y++) {
419 		src = src1;
420 		dst = (u32 __iomem *) dst1;
421 		for (x = 0; x < image->width; x += 8) {
422 			val = expand_pixel(*(src++));
423 			val = (val & fg) | (~val & bg);
424 			fb_writel(val, dst++);
425 		}
426 		src1 += image->width / 8;
427 		dst1 += info->fix.line_length;
428 	}
429 }
430 
431 static void s3fb_imageblit(struct fb_info *info, const struct fb_image *image)
432 {
433 	if ((info->var.bits_per_pixel == 4) && (image->depth == 1)
434 	    && ((image->width % 8) == 0) && ((image->dx % 8) == 0)) {
435 		if (info->fix.type == FB_TYPE_INTERLEAVED_PLANES)
436 			s3fb_iplan_imageblit(info, image);
437 		else
438 			s3fb_cfb4_imageblit(info, image);
439 	} else
440 		cfb_imageblit(info, image);
441 }
442 
443 static void s3fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
444 {
445 	if ((info->var.bits_per_pixel == 4)
446 	    && ((rect->width % 8) == 0) && ((rect->dx % 8) == 0)
447 	    && (info->fix.type == FB_TYPE_INTERLEAVED_PLANES))
448 		s3fb_iplan_fillrect(info, rect);
449 	 else
450 		cfb_fillrect(info, rect);
451 }
452 
453 
454 
455 /* ------------------------------------------------------------------------- */
456 
457 
458 static void s3_set_pixclock(struct fb_info *info, u32 pixclock)
459 {
460 	struct s3fb_info *par = info->par;
461 	u16 m, n, r;
462 	u8 regval;
463 	int rv;
464 
465 	rv = svga_compute_pll((par->chip == CHIP_365_TRIO3D) ? &s3_trio3d_pll : &s3_pll,
466 			      1000000000 / pixclock, &m, &n, &r, info->node);
467 	if (rv < 0) {
468 		fb_err(info, "cannot set requested pixclock, keeping old value\n");
469 		return;
470 	}
471 
472 	/* Set VGA misc register  */
473 	regval = vga_r(par->state.vgabase, VGA_MIS_R);
474 	vga_w(par->state.vgabase, VGA_MIS_W, regval | VGA_MIS_ENB_PLL_LOAD);
475 
476 	/* Set S3 clock registers */
477 	if (par->chip == CHIP_357_VIRGE_GX2 ||
478 	    par->chip == CHIP_359_VIRGE_GX2P ||
479 	    par->chip == CHIP_360_TRIO3D_1X ||
480 	    par->chip == CHIP_362_TRIO3D_2X ||
481 	    par->chip == CHIP_368_TRIO3D_2X ||
482 	    par->chip == CHIP_260_VIRGE_MX) {
483 		vga_wseq(par->state.vgabase, 0x12, (n - 2) | ((r & 3) << 6));	/* n and two bits of r */
484 		vga_wseq(par->state.vgabase, 0x29, r >> 2); /* remaining highest bit of r */
485 	} else
486 		vga_wseq(par->state.vgabase, 0x12, (n - 2) | (r << 5));
487 	vga_wseq(par->state.vgabase, 0x13, m - 2);
488 
489 	udelay(1000);
490 
491 	/* Activate clock - write 0, 1, 0 to seq/15 bit 5 */
492 	regval = vga_rseq (par->state.vgabase, 0x15); /* | 0x80; */
493 	vga_wseq(par->state.vgabase, 0x15, regval & ~(1<<5));
494 	vga_wseq(par->state.vgabase, 0x15, regval |  (1<<5));
495 	vga_wseq(par->state.vgabase, 0x15, regval & ~(1<<5));
496 }
497 
498 
499 /* Open framebuffer */
500 
501 static int s3fb_open(struct fb_info *info, int user)
502 {
503 	struct s3fb_info *par = info->par;
504 
505 	mutex_lock(&(par->open_lock));
506 	if (par->ref_count == 0) {
507 		void __iomem *vgabase = par->state.vgabase;
508 
509 		memset(&(par->state), 0, sizeof(struct vgastate));
510 		par->state.vgabase = vgabase;
511 		par->state.flags = VGA_SAVE_MODE | VGA_SAVE_FONTS | VGA_SAVE_CMAP;
512 		par->state.num_crtc = 0x70;
513 		par->state.num_seq = 0x20;
514 		save_vga(&(par->state));
515 	}
516 
517 	par->ref_count++;
518 	mutex_unlock(&(par->open_lock));
519 
520 	return 0;
521 }
522 
523 /* Close framebuffer */
524 
525 static int s3fb_release(struct fb_info *info, int user)
526 {
527 	struct s3fb_info *par = info->par;
528 
529 	mutex_lock(&(par->open_lock));
530 	if (par->ref_count == 0) {
531 		mutex_unlock(&(par->open_lock));
532 		return -EINVAL;
533 	}
534 
535 	if (par->ref_count == 1)
536 		restore_vga(&(par->state));
537 
538 	par->ref_count--;
539 	mutex_unlock(&(par->open_lock));
540 
541 	return 0;
542 }
543 
544 /* Validate passed in var */
545 
546 static int s3fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info)
547 {
548 	struct s3fb_info *par = info->par;
549 	int rv, mem, step;
550 	u16 m, n, r;
551 
552 	if (!var->pixclock)
553 		return -EINVAL;
554 
555 	/* Find appropriate format */
556 	rv = svga_match_format (s3fb_formats, var, NULL);
557 
558 	/* 32bpp mode is not supported on VIRGE VX,
559 	   24bpp is not supported on others */
560 	if ((par->chip == CHIP_988_VIRGE_VX) ? (rv == 7) : (rv == 6))
561 		rv = -EINVAL;
562 
563 	if (rv < 0) {
564 		fb_err(info, "unsupported mode requested\n");
565 		return rv;
566 	}
567 
568 	/* Do not allow to have real resoulution larger than virtual */
569 	if (var->xres > var->xres_virtual)
570 		var->xres_virtual = var->xres;
571 
572 	if (var->yres > var->yres_virtual)
573 		var->yres_virtual = var->yres;
574 
575 	/* Round up xres_virtual to have proper alignment of lines */
576 	step = s3fb_formats[rv].xresstep - 1;
577 	var->xres_virtual = (var->xres_virtual+step) & ~step;
578 
579 	/* Check whether have enough memory */
580 	mem = ((var->bits_per_pixel * var->xres_virtual) >> 3) * var->yres_virtual;
581 	if (mem > info->screen_size) {
582 		fb_err(info, "not enough framebuffer memory (%d kB requested , %u kB available)\n",
583 		       mem >> 10, (unsigned int) (info->screen_size >> 10));
584 		return -EINVAL;
585 	}
586 
587 	rv = svga_check_timings (&s3_timing_regs, var, info->node);
588 	if (rv < 0) {
589 		fb_err(info, "invalid timings requested\n");
590 		return rv;
591 	}
592 
593 	rv = svga_compute_pll(&s3_pll, PICOS2KHZ(var->pixclock), &m, &n, &r,
594 				info->node);
595 	if (rv < 0) {
596 		fb_err(info, "invalid pixclock value requested\n");
597 		return rv;
598 	}
599 
600 	return 0;
601 }
602 
603 /* Set video mode from par */
604 
605 static int s3fb_set_par(struct fb_info *info)
606 {
607 	struct s3fb_info *par = info->par;
608 	u32 value, mode, hmul, offset_value, screen_size, multiplex, dbytes;
609 	u32 bpp = info->var.bits_per_pixel;
610 	u32 htotal, hsstart;
611 
612 	if (bpp != 0) {
613 		info->fix.ypanstep = 1;
614 		info->fix.line_length = (info->var.xres_virtual * bpp) / 8;
615 
616 		info->flags &= ~FBINFO_MISC_TILEBLITTING;
617 		info->tileops = NULL;
618 
619 		/* in 4bpp supports 8p wide tiles only, any tiles otherwise */
620 		info->pixmap.blit_x = (bpp == 4) ? (1 << (8 - 1)) : (~(u32)0);
621 		info->pixmap.blit_y = ~(u32)0;
622 
623 		offset_value = (info->var.xres_virtual * bpp) / 64;
624 		screen_size = info->var.yres_virtual * info->fix.line_length;
625 	} else {
626 		info->fix.ypanstep = 16;
627 		info->fix.line_length = 0;
628 
629 		info->flags |= FBINFO_MISC_TILEBLITTING;
630 		info->tileops = fasttext ? &s3fb_fast_tile_ops : &s3fb_tile_ops;
631 
632 		/* supports 8x16 tiles only */
633 		info->pixmap.blit_x = 1 << (8 - 1);
634 		info->pixmap.blit_y = 1 << (16 - 1);
635 
636 		offset_value = info->var.xres_virtual / 16;
637 		screen_size = (info->var.xres_virtual * info->var.yres_virtual) / 64;
638 	}
639 
640 	info->var.xoffset = 0;
641 	info->var.yoffset = 0;
642 	info->var.activate = FB_ACTIVATE_NOW;
643 
644 	/* Unlock registers */
645 	vga_wcrt(par->state.vgabase, 0x38, 0x48);
646 	vga_wcrt(par->state.vgabase, 0x39, 0xA5);
647 	vga_wseq(par->state.vgabase, 0x08, 0x06);
648 	svga_wcrt_mask(par->state.vgabase, 0x11, 0x00, 0x80);
649 
650 	/* Blank screen and turn off sync */
651 	svga_wseq_mask(par->state.vgabase, 0x01, 0x20, 0x20);
652 	svga_wcrt_mask(par->state.vgabase, 0x17, 0x00, 0x80);
653 
654 	/* Set default values */
655 	svga_set_default_gfx_regs(par->state.vgabase);
656 	svga_set_default_atc_regs(par->state.vgabase);
657 	svga_set_default_seq_regs(par->state.vgabase);
658 	svga_set_default_crt_regs(par->state.vgabase);
659 	svga_wcrt_multi(par->state.vgabase, s3_line_compare_regs, 0xFFFFFFFF);
660 	svga_wcrt_multi(par->state.vgabase, s3_start_address_regs, 0);
661 
662 	/* S3 specific initialization */
663 	svga_wcrt_mask(par->state.vgabase, 0x58, 0x10, 0x10); /* enable linear framebuffer */
664 	svga_wcrt_mask(par->state.vgabase, 0x31, 0x08, 0x08); /* enable sequencer access to framebuffer above 256 kB */
665 
666 /*	svga_wcrt_mask(par->state.vgabase, 0x33, 0x08, 0x08); */ /* DDR ?	*/
667 /*	svga_wcrt_mask(par->state.vgabase, 0x43, 0x01, 0x01); */ /* DDR ?	*/
668 	svga_wcrt_mask(par->state.vgabase, 0x33, 0x00, 0x08); /* no DDR ?	*/
669 	svga_wcrt_mask(par->state.vgabase, 0x43, 0x00, 0x01); /* no DDR ?	*/
670 
671 	svga_wcrt_mask(par->state.vgabase, 0x5D, 0x00, 0x28); /* Clear strange HSlen bits */
672 
673 /*	svga_wcrt_mask(par->state.vgabase, 0x58, 0x03, 0x03); */
674 
675 /*	svga_wcrt_mask(par->state.vgabase, 0x53, 0x12, 0x13); */ /* enable MMIO */
676 /*	svga_wcrt_mask(par->state.vgabase, 0x40, 0x08, 0x08); */ /* enable write buffer */
677 
678 
679 	/* Set the offset register */
680 	fb_dbg(info, "offset register       : %d\n", offset_value);
681 	svga_wcrt_multi(par->state.vgabase, s3_offset_regs, offset_value);
682 
683 	if (par->chip != CHIP_357_VIRGE_GX2 &&
684 	    par->chip != CHIP_359_VIRGE_GX2P &&
685 	    par->chip != CHIP_360_TRIO3D_1X &&
686 	    par->chip != CHIP_362_TRIO3D_2X &&
687 	    par->chip != CHIP_368_TRIO3D_2X &&
688 	    par->chip != CHIP_260_VIRGE_MX) {
689 		vga_wcrt(par->state.vgabase, 0x54, 0x18); /* M parameter */
690 		vga_wcrt(par->state.vgabase, 0x60, 0xff); /* N parameter */
691 		vga_wcrt(par->state.vgabase, 0x61, 0xff); /* L parameter */
692 		vga_wcrt(par->state.vgabase, 0x62, 0xff); /* L parameter */
693 	}
694 
695 	vga_wcrt(par->state.vgabase, 0x3A, 0x35);
696 	svga_wattr(par->state.vgabase, 0x33, 0x00);
697 
698 	if (info->var.vmode & FB_VMODE_DOUBLE)
699 		svga_wcrt_mask(par->state.vgabase, 0x09, 0x80, 0x80);
700 	else
701 		svga_wcrt_mask(par->state.vgabase, 0x09, 0x00, 0x80);
702 
703 	if (info->var.vmode & FB_VMODE_INTERLACED)
704 		svga_wcrt_mask(par->state.vgabase, 0x42, 0x20, 0x20);
705 	else
706 		svga_wcrt_mask(par->state.vgabase, 0x42, 0x00, 0x20);
707 
708 	/* Disable hardware graphics cursor */
709 	svga_wcrt_mask(par->state.vgabase, 0x45, 0x00, 0x01);
710 	/* Disable Streams engine */
711 	svga_wcrt_mask(par->state.vgabase, 0x67, 0x00, 0x0C);
712 
713 	mode = svga_match_format(s3fb_formats, &(info->var), &(info->fix));
714 
715 	/* S3 virge DX hack */
716 	if (par->chip == CHIP_375_VIRGE_DX) {
717 		vga_wcrt(par->state.vgabase, 0x86, 0x80);
718 		vga_wcrt(par->state.vgabase, 0x90, 0x00);
719 	}
720 
721 	/* S3 virge VX hack */
722 	if (par->chip == CHIP_988_VIRGE_VX) {
723 		vga_wcrt(par->state.vgabase, 0x50, 0x00);
724 		vga_wcrt(par->state.vgabase, 0x67, 0x50);
725 		msleep(10); /* screen remains blank sometimes without this */
726 		vga_wcrt(par->state.vgabase, 0x63, (mode <= 2) ? 0x90 : 0x09);
727 		vga_wcrt(par->state.vgabase, 0x66, 0x90);
728 	}
729 
730 	if (par->chip == CHIP_357_VIRGE_GX2 ||
731 	    par->chip == CHIP_359_VIRGE_GX2P ||
732 	    par->chip == CHIP_360_TRIO3D_1X ||
733 	    par->chip == CHIP_362_TRIO3D_2X ||
734 	    par->chip == CHIP_368_TRIO3D_2X ||
735 	    par->chip == CHIP_365_TRIO3D    ||
736 	    par->chip == CHIP_375_VIRGE_DX  ||
737 	    par->chip == CHIP_385_VIRGE_GX  ||
738 	    par->chip == CHIP_260_VIRGE_MX) {
739 		dbytes = info->var.xres * ((bpp+7)/8);
740 		vga_wcrt(par->state.vgabase, 0x91, (dbytes + 7) / 8);
741 		vga_wcrt(par->state.vgabase, 0x90, (((dbytes + 7) / 8) >> 8) | 0x80);
742 
743 		vga_wcrt(par->state.vgabase, 0x66, 0x81);
744 	}
745 
746 	if (par->chip == CHIP_357_VIRGE_GX2  ||
747 	    par->chip == CHIP_359_VIRGE_GX2P ||
748 	    par->chip == CHIP_360_TRIO3D_1X ||
749 	    par->chip == CHIP_362_TRIO3D_2X ||
750 	    par->chip == CHIP_368_TRIO3D_2X ||
751 	    par->chip == CHIP_260_VIRGE_MX)
752 		vga_wcrt(par->state.vgabase, 0x34, 0x00);
753 	else	/* enable Data Transfer Position Control (DTPC) */
754 		vga_wcrt(par->state.vgabase, 0x34, 0x10);
755 
756 	svga_wcrt_mask(par->state.vgabase, 0x31, 0x00, 0x40);
757 	multiplex = 0;
758 	hmul = 1;
759 
760 	/* Set mode-specific register values */
761 	switch (mode) {
762 	case 0:
763 		fb_dbg(info, "text mode\n");
764 		svga_set_textmode_vga_regs(par->state.vgabase);
765 
766 		/* Set additional registers like in 8-bit mode */
767 		svga_wcrt_mask(par->state.vgabase, 0x50, 0x00, 0x30);
768 		svga_wcrt_mask(par->state.vgabase, 0x67, 0x00, 0xF0);
769 
770 		/* Disable enhanced mode */
771 		svga_wcrt_mask(par->state.vgabase, 0x3A, 0x00, 0x30);
772 
773 		if (fasttext) {
774 			fb_dbg(info, "high speed text mode set\n");
775 			svga_wcrt_mask(par->state.vgabase, 0x31, 0x40, 0x40);
776 		}
777 		break;
778 	case 1:
779 		fb_dbg(info, "4 bit pseudocolor\n");
780 		vga_wgfx(par->state.vgabase, VGA_GFX_MODE, 0x40);
781 
782 		/* Set additional registers like in 8-bit mode */
783 		svga_wcrt_mask(par->state.vgabase, 0x50, 0x00, 0x30);
784 		svga_wcrt_mask(par->state.vgabase, 0x67, 0x00, 0xF0);
785 
786 		/* disable enhanced mode */
787 		svga_wcrt_mask(par->state.vgabase, 0x3A, 0x00, 0x30);
788 		break;
789 	case 2:
790 		fb_dbg(info, "4 bit pseudocolor, planar\n");
791 
792 		/* Set additional registers like in 8-bit mode */
793 		svga_wcrt_mask(par->state.vgabase, 0x50, 0x00, 0x30);
794 		svga_wcrt_mask(par->state.vgabase, 0x67, 0x00, 0xF0);
795 
796 		/* disable enhanced mode */
797 		svga_wcrt_mask(par->state.vgabase, 0x3A, 0x00, 0x30);
798 		break;
799 	case 3:
800 		fb_dbg(info, "8 bit pseudocolor\n");
801 		svga_wcrt_mask(par->state.vgabase, 0x50, 0x00, 0x30);
802 		if (info->var.pixclock > 20000 ||
803 		    par->chip == CHIP_357_VIRGE_GX2 ||
804 		    par->chip == CHIP_359_VIRGE_GX2P ||
805 		    par->chip == CHIP_360_TRIO3D_1X ||
806 		    par->chip == CHIP_362_TRIO3D_2X ||
807 		    par->chip == CHIP_368_TRIO3D_2X ||
808 		    par->chip == CHIP_260_VIRGE_MX)
809 			svga_wcrt_mask(par->state.vgabase, 0x67, 0x00, 0xF0);
810 		else {
811 			svga_wcrt_mask(par->state.vgabase, 0x67, 0x10, 0xF0);
812 			multiplex = 1;
813 		}
814 		break;
815 	case 4:
816 		fb_dbg(info, "5/5/5 truecolor\n");
817 		if (par->chip == CHIP_988_VIRGE_VX) {
818 			if (info->var.pixclock > 20000)
819 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x20, 0xF0);
820 			else
821 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x30, 0xF0);
822 		} else if (par->chip == CHIP_365_TRIO3D) {
823 			svga_wcrt_mask(par->state.vgabase, 0x50, 0x10, 0x30);
824 			if (info->var.pixclock > 8695) {
825 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x30, 0xF0);
826 				hmul = 2;
827 			} else {
828 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x20, 0xF0);
829 				multiplex = 1;
830 			}
831 		} else {
832 			svga_wcrt_mask(par->state.vgabase, 0x50, 0x10, 0x30);
833 			svga_wcrt_mask(par->state.vgabase, 0x67, 0x30, 0xF0);
834 			if (par->chip != CHIP_357_VIRGE_GX2 &&
835 			    par->chip != CHIP_359_VIRGE_GX2P &&
836 			    par->chip != CHIP_360_TRIO3D_1X &&
837 			    par->chip != CHIP_362_TRIO3D_2X &&
838 			    par->chip != CHIP_368_TRIO3D_2X &&
839 			    par->chip != CHIP_260_VIRGE_MX)
840 				hmul = 2;
841 		}
842 		break;
843 	case 5:
844 		fb_dbg(info, "5/6/5 truecolor\n");
845 		if (par->chip == CHIP_988_VIRGE_VX) {
846 			if (info->var.pixclock > 20000)
847 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x40, 0xF0);
848 			else
849 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x50, 0xF0);
850 		} else if (par->chip == CHIP_365_TRIO3D) {
851 			svga_wcrt_mask(par->state.vgabase, 0x50, 0x10, 0x30);
852 			if (info->var.pixclock > 8695) {
853 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x50, 0xF0);
854 				hmul = 2;
855 			} else {
856 				svga_wcrt_mask(par->state.vgabase, 0x67, 0x40, 0xF0);
857 				multiplex = 1;
858 			}
859 		} else {
860 			svga_wcrt_mask(par->state.vgabase, 0x50, 0x10, 0x30);
861 			svga_wcrt_mask(par->state.vgabase, 0x67, 0x50, 0xF0);
862 			if (par->chip != CHIP_357_VIRGE_GX2 &&
863 			    par->chip != CHIP_359_VIRGE_GX2P &&
864 			    par->chip != CHIP_360_TRIO3D_1X &&
865 			    par->chip != CHIP_362_TRIO3D_2X &&
866 			    par->chip != CHIP_368_TRIO3D_2X &&
867 			    par->chip != CHIP_260_VIRGE_MX)
868 				hmul = 2;
869 		}
870 		break;
871 	case 6:
872 		/* VIRGE VX case */
873 		fb_dbg(info, "8/8/8 truecolor\n");
874 		svga_wcrt_mask(par->state.vgabase, 0x67, 0xD0, 0xF0);
875 		break;
876 	case 7:
877 		fb_dbg(info, "8/8/8/8 truecolor\n");
878 		svga_wcrt_mask(par->state.vgabase, 0x50, 0x30, 0x30);
879 		svga_wcrt_mask(par->state.vgabase, 0x67, 0xD0, 0xF0);
880 		break;
881 	default:
882 		fb_err(info, "unsupported mode - bug\n");
883 		return -EINVAL;
884 	}
885 
886 	if (par->chip != CHIP_988_VIRGE_VX) {
887 		svga_wseq_mask(par->state.vgabase, 0x15, multiplex ? 0x10 : 0x00, 0x10);
888 		svga_wseq_mask(par->state.vgabase, 0x18, multiplex ? 0x80 : 0x00, 0x80);
889 	}
890 
891 	s3_set_pixclock(info, info->var.pixclock);
892 	svga_set_timings(par->state.vgabase, &s3_timing_regs, &(info->var), hmul, 1,
893 			 (info->var.vmode & FB_VMODE_DOUBLE)     ? 2 : 1,
894 			 (info->var.vmode & FB_VMODE_INTERLACED) ? 2 : 1,
895 			 hmul, info->node);
896 
897 	/* Set interlaced mode start/end register */
898 	htotal = info->var.xres + info->var.left_margin + info->var.right_margin + info->var.hsync_len;
899 	htotal = ((htotal * hmul) / 8) - 5;
900 	vga_wcrt(par->state.vgabase, 0x3C, (htotal + 1) / 2);
901 
902 	/* Set Data Transfer Position */
903 	hsstart = ((info->var.xres + info->var.right_margin) * hmul) / 8;
904 	/* + 2 is needed for Virge/VX, does no harm on other cards */
905 	value = clamp((htotal + hsstart + 1) / 2 + 2, hsstart + 4, htotal + 1);
906 	svga_wcrt_multi(par->state.vgabase, s3_dtpc_regs, value);
907 
908 	memset_io(info->screen_base, 0x00, screen_size);
909 	/* Device and screen back on */
910 	svga_wcrt_mask(par->state.vgabase, 0x17, 0x80, 0x80);
911 	svga_wseq_mask(par->state.vgabase, 0x01, 0x00, 0x20);
912 
913 	return 0;
914 }
915 
916 /* Set a colour register */
917 
918 static int s3fb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
919 				u_int transp, struct fb_info *fb)
920 {
921 	switch (fb->var.bits_per_pixel) {
922 	case 0:
923 	case 4:
924 		if (regno >= 16)
925 			return -EINVAL;
926 
927 		if ((fb->var.bits_per_pixel == 4) &&
928 		    (fb->var.nonstd == 0)) {
929 			outb(0xF0, VGA_PEL_MSK);
930 			outb(regno*16, VGA_PEL_IW);
931 		} else {
932 			outb(0x0F, VGA_PEL_MSK);
933 			outb(regno, VGA_PEL_IW);
934 		}
935 		outb(red >> 10, VGA_PEL_D);
936 		outb(green >> 10, VGA_PEL_D);
937 		outb(blue >> 10, VGA_PEL_D);
938 		break;
939 	case 8:
940 		if (regno >= 256)
941 			return -EINVAL;
942 
943 		outb(0xFF, VGA_PEL_MSK);
944 		outb(regno, VGA_PEL_IW);
945 		outb(red >> 10, VGA_PEL_D);
946 		outb(green >> 10, VGA_PEL_D);
947 		outb(blue >> 10, VGA_PEL_D);
948 		break;
949 	case 16:
950 		if (regno >= 16)
951 			return 0;
952 
953 		if (fb->var.green.length == 5)
954 			((u32*)fb->pseudo_palette)[regno] = ((red & 0xF800) >> 1) |
955 				((green & 0xF800) >> 6) | ((blue & 0xF800) >> 11);
956 		else if (fb->var.green.length == 6)
957 			((u32*)fb->pseudo_palette)[regno] = (red & 0xF800) |
958 				((green & 0xFC00) >> 5) | ((blue & 0xF800) >> 11);
959 		else return -EINVAL;
960 		break;
961 	case 24:
962 	case 32:
963 		if (regno >= 16)
964 			return 0;
965 
966 		((u32*)fb->pseudo_palette)[regno] = ((red & 0xFF00) << 8) |
967 			(green & 0xFF00) | ((blue & 0xFF00) >> 8);
968 		break;
969 	default:
970 		return -EINVAL;
971 	}
972 
973 	return 0;
974 }
975 
976 
977 /* Set the display blanking state */
978 
979 static int s3fb_blank(int blank_mode, struct fb_info *info)
980 {
981 	struct s3fb_info *par = info->par;
982 
983 	switch (blank_mode) {
984 	case FB_BLANK_UNBLANK:
985 		fb_dbg(info, "unblank\n");
986 		svga_wcrt_mask(par->state.vgabase, 0x56, 0x00, 0x06);
987 		svga_wseq_mask(par->state.vgabase, 0x01, 0x00, 0x20);
988 		break;
989 	case FB_BLANK_NORMAL:
990 		fb_dbg(info, "blank\n");
991 		svga_wcrt_mask(par->state.vgabase, 0x56, 0x00, 0x06);
992 		svga_wseq_mask(par->state.vgabase, 0x01, 0x20, 0x20);
993 		break;
994 	case FB_BLANK_HSYNC_SUSPEND:
995 		fb_dbg(info, "hsync\n");
996 		svga_wcrt_mask(par->state.vgabase, 0x56, 0x02, 0x06);
997 		svga_wseq_mask(par->state.vgabase, 0x01, 0x20, 0x20);
998 		break;
999 	case FB_BLANK_VSYNC_SUSPEND:
1000 		fb_dbg(info, "vsync\n");
1001 		svga_wcrt_mask(par->state.vgabase, 0x56, 0x04, 0x06);
1002 		svga_wseq_mask(par->state.vgabase, 0x01, 0x20, 0x20);
1003 		break;
1004 	case FB_BLANK_POWERDOWN:
1005 		fb_dbg(info, "sync down\n");
1006 		svga_wcrt_mask(par->state.vgabase, 0x56, 0x06, 0x06);
1007 		svga_wseq_mask(par->state.vgabase, 0x01, 0x20, 0x20);
1008 		break;
1009 	}
1010 
1011 	return 0;
1012 }
1013 
1014 
1015 /* Pan the display */
1016 
1017 static int s3fb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info)
1018 {
1019 	struct s3fb_info *par = info->par;
1020 	unsigned int offset;
1021 
1022 	/* Calculate the offset */
1023 	if (info->var.bits_per_pixel == 0) {
1024 		offset = (var->yoffset / 16) * (info->var.xres_virtual / 2)
1025 		       + (var->xoffset / 2);
1026 		offset = offset >> 2;
1027 	} else {
1028 		offset = (var->yoffset * info->fix.line_length) +
1029 			 (var->xoffset * info->var.bits_per_pixel / 8);
1030 		offset = offset >> 2;
1031 	}
1032 
1033 	/* Set the offset */
1034 	svga_wcrt_multi(par->state.vgabase, s3_start_address_regs, offset);
1035 
1036 	return 0;
1037 }
1038 
1039 /* ------------------------------------------------------------------------- */
1040 
1041 /* Frame buffer operations */
1042 
1043 static const struct fb_ops s3fb_ops = {
1044 	.owner		= THIS_MODULE,
1045 	.fb_open	= s3fb_open,
1046 	.fb_release	= s3fb_release,
1047 	.fb_check_var	= s3fb_check_var,
1048 	.fb_set_par	= s3fb_set_par,
1049 	.fb_setcolreg	= s3fb_setcolreg,
1050 	.fb_blank	= s3fb_blank,
1051 	.fb_pan_display	= s3fb_pan_display,
1052 	.fb_fillrect	= s3fb_fillrect,
1053 	.fb_copyarea	= cfb_copyarea,
1054 	.fb_imageblit	= s3fb_imageblit,
1055 	.fb_get_caps    = svga_get_caps,
1056 };
1057 
1058 /* ------------------------------------------------------------------------- */
1059 
1060 static int s3_identification(struct s3fb_info *par)
1061 {
1062 	int chip = par->chip;
1063 
1064 	if (chip == CHIP_XXX_TRIO) {
1065 		u8 cr30 = vga_rcrt(par->state.vgabase, 0x30);
1066 		u8 cr2e = vga_rcrt(par->state.vgabase, 0x2e);
1067 		u8 cr2f = vga_rcrt(par->state.vgabase, 0x2f);
1068 
1069 		if ((cr30 == 0xE0) || (cr30 == 0xE1)) {
1070 			if (cr2e == 0x10)
1071 				return CHIP_732_TRIO32;
1072 			if (cr2e == 0x11) {
1073 				if (! (cr2f & 0x40))
1074 					return CHIP_764_TRIO64;
1075 				else
1076 					return CHIP_765_TRIO64VP;
1077 			}
1078 		}
1079 	}
1080 
1081 	if (chip == CHIP_XXX_TRIO64V2_DXGX) {
1082 		u8 cr6f = vga_rcrt(par->state.vgabase, 0x6f);
1083 
1084 		if (! (cr6f & 0x01))
1085 			return CHIP_775_TRIO64V2_DX;
1086 		else
1087 			return CHIP_785_TRIO64V2_GX;
1088 	}
1089 
1090 	if (chip == CHIP_XXX_VIRGE_DXGX) {
1091 		u8 cr6f = vga_rcrt(par->state.vgabase, 0x6f);
1092 
1093 		if (! (cr6f & 0x01))
1094 			return CHIP_375_VIRGE_DX;
1095 		else
1096 			return CHIP_385_VIRGE_GX;
1097 	}
1098 
1099 	if (chip == CHIP_36X_TRIO3D_1X_2X) {
1100 		switch (vga_rcrt(par->state.vgabase, 0x2f)) {
1101 		case 0x00:
1102 			return CHIP_360_TRIO3D_1X;
1103 		case 0x01:
1104 			return CHIP_362_TRIO3D_2X;
1105 		case 0x02:
1106 			return CHIP_368_TRIO3D_2X;
1107 		}
1108 	}
1109 
1110 	return CHIP_UNKNOWN;
1111 }
1112 
1113 
1114 /* PCI probe */
1115 
1116 static int s3_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
1117 {
1118 	struct pci_bus_region bus_reg;
1119 	struct resource vga_res;
1120 	struct fb_info *info;
1121 	struct s3fb_info *par;
1122 	int rc;
1123 	u8 regval, cr38, cr39;
1124 	bool found = false;
1125 
1126 	/* Ignore secondary VGA device because there is no VGA arbitration */
1127 	if (! svga_primary_device(dev)) {
1128 		dev_info(&(dev->dev), "ignoring secondary device\n");
1129 		return -ENODEV;
1130 	}
1131 
1132 	/* Allocate and fill driver data structure */
1133 	info = framebuffer_alloc(sizeof(struct s3fb_info), &(dev->dev));
1134 	if (!info)
1135 		return -ENOMEM;
1136 
1137 	par = info->par;
1138 	mutex_init(&par->open_lock);
1139 
1140 	info->flags = FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
1141 	info->fbops = &s3fb_ops;
1142 
1143 	/* Prepare PCI device */
1144 	rc = pci_enable_device(dev);
1145 	if (rc < 0) {
1146 		dev_err(info->device, "cannot enable PCI device\n");
1147 		goto err_enable_device;
1148 	}
1149 
1150 	rc = pci_request_regions(dev, "s3fb");
1151 	if (rc < 0) {
1152 		dev_err(info->device, "cannot reserve framebuffer region\n");
1153 		goto err_request_regions;
1154 	}
1155 
1156 
1157 	info->fix.smem_start = pci_resource_start(dev, 0);
1158 	info->fix.smem_len = pci_resource_len(dev, 0);
1159 
1160 	/* Map physical IO memory address into kernel space */
1161 	info->screen_base = pci_iomap_wc(dev, 0, 0);
1162 	if (! info->screen_base) {
1163 		rc = -ENOMEM;
1164 		dev_err(info->device, "iomap for framebuffer failed\n");
1165 		goto err_iomap;
1166 	}
1167 
1168 	bus_reg.start = 0;
1169 	bus_reg.end = 64 * 1024;
1170 
1171 	vga_res.flags = IORESOURCE_IO;
1172 
1173 	pcibios_bus_to_resource(dev->bus, &vga_res, &bus_reg);
1174 
1175 	par->state.vgabase = (void __iomem *) (unsigned long) vga_res.start;
1176 
1177 	/* Unlock regs */
1178 	cr38 = vga_rcrt(par->state.vgabase, 0x38);
1179 	cr39 = vga_rcrt(par->state.vgabase, 0x39);
1180 	vga_wseq(par->state.vgabase, 0x08, 0x06);
1181 	vga_wcrt(par->state.vgabase, 0x38, 0x48);
1182 	vga_wcrt(par->state.vgabase, 0x39, 0xA5);
1183 
1184 	/* Identify chip type */
1185 	par->chip = id->driver_data & CHIP_MASK;
1186 	par->rev = vga_rcrt(par->state.vgabase, 0x2f);
1187 	if (par->chip & CHIP_UNDECIDED_FLAG)
1188 		par->chip = s3_identification(par);
1189 
1190 	/* Find how many physical memory there is on card */
1191 	/* 0x36 register is accessible even if other registers are locked */
1192 	regval = vga_rcrt(par->state.vgabase, 0x36);
1193 	if (par->chip == CHIP_360_TRIO3D_1X ||
1194 	    par->chip == CHIP_362_TRIO3D_2X ||
1195 	    par->chip == CHIP_368_TRIO3D_2X ||
1196 	    par->chip == CHIP_365_TRIO3D) {
1197 		switch ((regval & 0xE0) >> 5) {
1198 		case 0: /* 8MB -- only 4MB usable for display */
1199 		case 1: /* 4MB with 32-bit bus */
1200 		case 2:	/* 4MB */
1201 			info->screen_size = 4 << 20;
1202 			break;
1203 		case 4: /* 2MB on 365 Trio3D */
1204 		case 6: /* 2MB */
1205 			info->screen_size = 2 << 20;
1206 			break;
1207 		}
1208 	} else if (par->chip == CHIP_357_VIRGE_GX2 ||
1209 		   par->chip == CHIP_359_VIRGE_GX2P ||
1210 		   par->chip == CHIP_260_VIRGE_MX) {
1211 		switch ((regval & 0xC0) >> 6) {
1212 		case 1: /* 4MB */
1213 			info->screen_size = 4 << 20;
1214 			break;
1215 		case 3: /* 2MB */
1216 			info->screen_size = 2 << 20;
1217 			break;
1218 		}
1219 	} else if (par->chip == CHIP_988_VIRGE_VX) {
1220 		switch ((regval & 0x60) >> 5) {
1221 		case 0: /* 2MB */
1222 			info->screen_size = 2 << 20;
1223 			break;
1224 		case 1: /* 4MB */
1225 			info->screen_size = 4 << 20;
1226 			break;
1227 		case 2: /* 6MB */
1228 			info->screen_size = 6 << 20;
1229 			break;
1230 		case 3: /* 8MB */
1231 			info->screen_size = 8 << 20;
1232 			break;
1233 		}
1234 		/* off-screen memory */
1235 		regval = vga_rcrt(par->state.vgabase, 0x37);
1236 		switch ((regval & 0x60) >> 5) {
1237 		case 1: /* 4MB */
1238 			info->screen_size -= 4 << 20;
1239 			break;
1240 		case 2: /* 2MB */
1241 			info->screen_size -= 2 << 20;
1242 			break;
1243 		}
1244 	} else
1245 		info->screen_size = s3_memsizes[regval >> 5] << 10;
1246 	info->fix.smem_len = info->screen_size;
1247 
1248 	/* Find MCLK frequency */
1249 	regval = vga_rseq(par->state.vgabase, 0x10);
1250 	par->mclk_freq = ((vga_rseq(par->state.vgabase, 0x11) + 2) * 14318) / ((regval & 0x1F)  + 2);
1251 	par->mclk_freq = par->mclk_freq >> (regval >> 5);
1252 
1253 	/* Restore locks */
1254 	vga_wcrt(par->state.vgabase, 0x38, cr38);
1255 	vga_wcrt(par->state.vgabase, 0x39, cr39);
1256 
1257 	strcpy(info->fix.id, s3_names [par->chip]);
1258 	info->fix.mmio_start = 0;
1259 	info->fix.mmio_len = 0;
1260 	info->fix.type = FB_TYPE_PACKED_PIXELS;
1261 	info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
1262 	info->fix.ypanstep = 0;
1263 	info->fix.accel = FB_ACCEL_NONE;
1264 	info->pseudo_palette = (void*) (par->pseudo_palette);
1265 	info->var.bits_per_pixel = 8;
1266 
1267 #ifdef CONFIG_FB_S3_DDC
1268 	/* Enable MMIO if needed */
1269 	if (s3fb_ddc_needs_mmio(par->chip)) {
1270 		par->mmio = ioremap(info->fix.smem_start + MMIO_OFFSET, MMIO_SIZE);
1271 		if (par->mmio)
1272 			svga_wcrt_mask(par->state.vgabase, 0x53, 0x08, 0x08);	/* enable MMIO */
1273 		else
1274 			dev_err(info->device, "unable to map MMIO at 0x%lx, disabling DDC",
1275 				info->fix.smem_start + MMIO_OFFSET);
1276 	}
1277 	if (!s3fb_ddc_needs_mmio(par->chip) || par->mmio)
1278 		if (s3fb_setup_ddc_bus(info) == 0) {
1279 			u8 *edid = fb_ddc_read(&par->ddc_adapter);
1280 			par->ddc_registered = true;
1281 			if (edid) {
1282 				fb_edid_to_monspecs(edid, &info->monspecs);
1283 				kfree(edid);
1284 				if (!info->monspecs.modedb)
1285 					dev_err(info->device, "error getting mode database\n");
1286 				else {
1287 					const struct fb_videomode *m;
1288 
1289 					fb_videomode_to_modelist(info->monspecs.modedb,
1290 								 info->monspecs.modedb_len,
1291 								 &info->modelist);
1292 					m = fb_find_best_display(&info->monspecs, &info->modelist);
1293 					if (m) {
1294 						fb_videomode_to_var(&info->var, m);
1295 						/* fill all other info->var's fields */
1296 						if (s3fb_check_var(&info->var, info) == 0)
1297 							found = true;
1298 					}
1299 				}
1300 			}
1301 		}
1302 #endif
1303 	if (!mode_option && !found)
1304 		mode_option = "640x480-8@60";
1305 
1306 	/* Prepare startup mode */
1307 	if (mode_option) {
1308 		rc = fb_find_mode(&info->var, info, mode_option,
1309 				   info->monspecs.modedb, info->monspecs.modedb_len,
1310 				   NULL, info->var.bits_per_pixel);
1311 		if (!rc || rc == 4) {
1312 			rc = -EINVAL;
1313 			dev_err(info->device, "mode %s not found\n", mode_option);
1314 			fb_destroy_modedb(info->monspecs.modedb);
1315 			info->monspecs.modedb = NULL;
1316 			goto err_find_mode;
1317 		}
1318 	}
1319 
1320 	fb_destroy_modedb(info->monspecs.modedb);
1321 	info->monspecs.modedb = NULL;
1322 
1323 	/* maximize virtual vertical size for fast scrolling */
1324 	info->var.yres_virtual = info->fix.smem_len * 8 /
1325 			(info->var.bits_per_pixel * info->var.xres_virtual);
1326 	if (info->var.yres_virtual < info->var.yres) {
1327 		dev_err(info->device, "virtual vertical size smaller than real\n");
1328 		rc = -EINVAL;
1329 		goto err_find_mode;
1330 	}
1331 
1332 	rc = fb_alloc_cmap(&info->cmap, 256, 0);
1333 	if (rc < 0) {
1334 		dev_err(info->device, "cannot allocate colormap\n");
1335 		goto err_alloc_cmap;
1336 	}
1337 
1338 	rc = register_framebuffer(info);
1339 	if (rc < 0) {
1340 		dev_err(info->device, "cannot register framebuffer\n");
1341 		goto err_reg_fb;
1342 	}
1343 
1344 	fb_info(info, "%s on %s, %d MB RAM, %d MHz MCLK\n",
1345 		info->fix.id, pci_name(dev),
1346 		info->fix.smem_len >> 20, (par->mclk_freq + 500) / 1000);
1347 
1348 	if (par->chip == CHIP_UNKNOWN)
1349 		fb_info(info, "unknown chip, CR2D=%x, CR2E=%x, CRT2F=%x, CRT30=%x\n",
1350 			vga_rcrt(par->state.vgabase, 0x2d),
1351 			vga_rcrt(par->state.vgabase, 0x2e),
1352 			vga_rcrt(par->state.vgabase, 0x2f),
1353 			vga_rcrt(par->state.vgabase, 0x30));
1354 
1355 	/* Record a reference to the driver data */
1356 	pci_set_drvdata(dev, info);
1357 
1358 	if (mtrr)
1359 		par->wc_cookie = arch_phys_wc_add(info->fix.smem_start,
1360 						  info->fix.smem_len);
1361 
1362 	return 0;
1363 
1364 	/* Error handling */
1365 err_reg_fb:
1366 	fb_dealloc_cmap(&info->cmap);
1367 err_alloc_cmap:
1368 err_find_mode:
1369 #ifdef CONFIG_FB_S3_DDC
1370 	if (par->ddc_registered)
1371 		i2c_del_adapter(&par->ddc_adapter);
1372 	if (par->mmio)
1373 		iounmap(par->mmio);
1374 #endif
1375 	pci_iounmap(dev, info->screen_base);
1376 err_iomap:
1377 	pci_release_regions(dev);
1378 err_request_regions:
1379 /*	pci_disable_device(dev); */
1380 err_enable_device:
1381 	framebuffer_release(info);
1382 	return rc;
1383 }
1384 
1385 
1386 /* PCI remove */
1387 
1388 static void s3_pci_remove(struct pci_dev *dev)
1389 {
1390 	struct fb_info *info = pci_get_drvdata(dev);
1391 	struct s3fb_info __maybe_unused *par;
1392 
1393 	if (info) {
1394 		par = info->par;
1395 		arch_phys_wc_del(par->wc_cookie);
1396 		unregister_framebuffer(info);
1397 		fb_dealloc_cmap(&info->cmap);
1398 
1399 #ifdef CONFIG_FB_S3_DDC
1400 		if (par->ddc_registered)
1401 			i2c_del_adapter(&par->ddc_adapter);
1402 		if (par->mmio)
1403 			iounmap(par->mmio);
1404 #endif
1405 
1406 		pci_iounmap(dev, info->screen_base);
1407 		pci_release_regions(dev);
1408 /*		pci_disable_device(dev); */
1409 
1410 		framebuffer_release(info);
1411 	}
1412 }
1413 
1414 /* PCI suspend */
1415 
1416 static int __maybe_unused s3_pci_suspend(struct device *dev)
1417 {
1418 	struct fb_info *info = dev_get_drvdata(dev);
1419 	struct s3fb_info *par = info->par;
1420 
1421 	dev_info(info->device, "suspend\n");
1422 
1423 	console_lock();
1424 	mutex_lock(&(par->open_lock));
1425 
1426 	if (par->ref_count == 0) {
1427 		mutex_unlock(&(par->open_lock));
1428 		console_unlock();
1429 		return 0;
1430 	}
1431 
1432 	fb_set_suspend(info, 1);
1433 
1434 	mutex_unlock(&(par->open_lock));
1435 	console_unlock();
1436 
1437 	return 0;
1438 }
1439 
1440 
1441 /* PCI resume */
1442 
1443 static int __maybe_unused s3_pci_resume(struct device *dev)
1444 {
1445 	struct fb_info *info = dev_get_drvdata(dev);
1446 	struct s3fb_info *par = info->par;
1447 
1448 	dev_info(info->device, "resume\n");
1449 
1450 	console_lock();
1451 	mutex_lock(&(par->open_lock));
1452 
1453 	if (par->ref_count == 0) {
1454 		mutex_unlock(&(par->open_lock));
1455 		console_unlock();
1456 		return 0;
1457 	}
1458 
1459 	s3fb_set_par(info);
1460 	fb_set_suspend(info, 0);
1461 
1462 	mutex_unlock(&(par->open_lock));
1463 	console_unlock();
1464 
1465 	return 0;
1466 }
1467 
1468 static const struct dev_pm_ops s3_pci_pm_ops = {
1469 #ifdef CONFIG_PM_SLEEP
1470 	.suspend	= s3_pci_suspend,
1471 	.resume		= s3_pci_resume,
1472 	.freeze		= NULL,
1473 	.thaw		= s3_pci_resume,
1474 	.poweroff	= s3_pci_suspend,
1475 	.restore	= s3_pci_resume,
1476 #endif
1477 };
1478 
1479 /* List of boards that we are trying to support */
1480 
1481 static const struct pci_device_id s3_devices[] = {
1482 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8810), .driver_data = CHIP_XXX_TRIO},
1483 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8811), .driver_data = CHIP_XXX_TRIO},
1484 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8812), .driver_data = CHIP_M65_AURORA64VP},
1485 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8814), .driver_data = CHIP_767_TRIO64UVP},
1486 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8901), .driver_data = CHIP_XXX_TRIO64V2_DXGX},
1487 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8902), .driver_data = CHIP_551_PLATO_PX},
1488 
1489 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x5631), .driver_data = CHIP_325_VIRGE},
1490 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x883D), .driver_data = CHIP_988_VIRGE_VX},
1491 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8A01), .driver_data = CHIP_XXX_VIRGE_DXGX},
1492 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8A10), .driver_data = CHIP_357_VIRGE_GX2},
1493 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8A11), .driver_data = CHIP_359_VIRGE_GX2P},
1494 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8A12), .driver_data = CHIP_359_VIRGE_GX2P},
1495 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8A13), .driver_data = CHIP_36X_TRIO3D_1X_2X},
1496 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8904), .driver_data = CHIP_365_TRIO3D},
1497 	{PCI_DEVICE(PCI_VENDOR_ID_S3, 0x8C01), .driver_data = CHIP_260_VIRGE_MX},
1498 
1499 	{0, 0, 0, 0, 0, 0, 0}
1500 };
1501 
1502 
1503 MODULE_DEVICE_TABLE(pci, s3_devices);
1504 
1505 static struct pci_driver s3fb_pci_driver = {
1506 	.name		= "s3fb",
1507 	.id_table	= s3_devices,
1508 	.probe		= s3_pci_probe,
1509 	.remove		= s3_pci_remove,
1510 	.driver.pm	= &s3_pci_pm_ops,
1511 };
1512 
1513 /* Parse user specified options */
1514 
1515 #ifndef MODULE
1516 static int  __init s3fb_setup(char *options)
1517 {
1518 	char *opt;
1519 
1520 	if (!options || !*options)
1521 		return 0;
1522 
1523 	while ((opt = strsep(&options, ",")) != NULL) {
1524 
1525 		if (!*opt)
1526 			continue;
1527 		else if (!strncmp(opt, "mtrr:", 5))
1528 			mtrr = simple_strtoul(opt + 5, NULL, 0);
1529 		else if (!strncmp(opt, "fasttext:", 9))
1530 			fasttext = simple_strtoul(opt + 9, NULL, 0);
1531 		else
1532 			mode_option = opt;
1533 	}
1534 
1535 	return 0;
1536 }
1537 #endif
1538 
1539 /* Cleanup */
1540 
1541 static void __exit s3fb_cleanup(void)
1542 {
1543 	pr_debug("s3fb: cleaning up\n");
1544 	pci_unregister_driver(&s3fb_pci_driver);
1545 }
1546 
1547 /* Driver Initialisation */
1548 
1549 static int __init s3fb_init(void)
1550 {
1551 
1552 #ifndef MODULE
1553 	char *option = NULL;
1554 
1555 	if (fb_get_options("s3fb", &option))
1556 		return -ENODEV;
1557 	s3fb_setup(option);
1558 #endif
1559 
1560 	pr_debug("s3fb: initializing\n");
1561 	return pci_register_driver(&s3fb_pci_driver);
1562 }
1563 
1564 /* ------------------------------------------------------------------------- */
1565 
1566 /* Modularization */
1567 
1568 module_init(s3fb_init);
1569 module_exit(s3fb_cleanup);
1570