2 * drivers/video/asiliantfb.c
3 * frame buffer driver for Asiliant 69000 chip
4 * Copyright (C) 2001-2003 Saito.K & Jeanne
6 * from driver/video/chipsfb.c and,
8 * drivers/video/asiliantfb.c -- frame buffer device for
9 * Asiliant 69030 chip (formerly Intel, formerly Chips & Technologies)
10 * Author: apc@agelectronics.co.uk
11 * Copyright (C) 2000 AG Electronics
12 * Note: the data sheets don't seem to be available from Asiliant.
13 * They are available by searching developer.intel.com, but are not otherwise
16 * This driver should be portable with minimal effort to the 69000 display
17 * chip, and to the twin-display mode of the 69030.
18 * Contains code from Thomas Hhenleitner <th@visuelle-maschinen.de> (thanks)
20 * Derived from the CT65550 driver chipsfb.c:
21 * Copyright (C) 1998 Paul Mackerras
22 * ...which was derived from the Powermac "chips" driver:
23 * Copyright (C) 1997 Fabio Riccardi.
24 * And from the frame buffer device for Open Firmware-initialized devices:
25 * Copyright (C) 1997 Geert Uytterhoeven.
27 * This file is subject to the terms and conditions of the GNU General Public
28 * License. See the file COPYING in the main directory of this archive for
32 #include <linux/config.h>
33 #include <linux/module.h>
34 #include <linux/kernel.h>
35 #include <linux/errno.h>
36 #include <linux/string.h>
38 #include <linux/tty.h>
39 #include <linux/slab.h>
40 #include <linux/vmalloc.h>
41 #include <linux/delay.h>
42 #include <linux/interrupt.h>
44 #include <linux/init.h>
45 #include <linux/pci.h>
48 /* Built in clock of the 69030 */
49 static const unsigned Fref
= 14318180;
51 #define mmio_base (p->screen_base + 0x400000)
53 #define mm_write_ind(num, val, ap, dp) do { \
54 writeb((num), mmio_base + (ap)); writeb((val), mmio_base + (dp)); \
57 static void mm_write_xr(struct fb_info
*p
, u8 reg
, u8 data
)
59 mm_write_ind(reg
, data
, 0x7ac, 0x7ad);
61 #define write_xr(num, val) mm_write_xr(p, num, val)
63 static void mm_write_fr(struct fb_info
*p
, u8 reg
, u8 data
)
65 mm_write_ind(reg
, data
, 0x7a0, 0x7a1);
67 #define write_fr(num, val) mm_write_fr(p, num, val)
69 static void mm_write_cr(struct fb_info
*p
, u8 reg
, u8 data
)
71 mm_write_ind(reg
, data
, 0x7a8, 0x7a9);
73 #define write_cr(num, val) mm_write_cr(p, num, val)
75 static void mm_write_gr(struct fb_info
*p
, u8 reg
, u8 data
)
77 mm_write_ind(reg
, data
, 0x79c, 0x79d);
79 #define write_gr(num, val) mm_write_gr(p, num, val)
81 static void mm_write_sr(struct fb_info
*p
, u8 reg
, u8 data
)
83 mm_write_ind(reg
, data
, 0x788, 0x789);
85 #define write_sr(num, val) mm_write_sr(p, num, val)
87 static void mm_write_ar(struct fb_info
*p
, u8 reg
, u8 data
)
89 readb(mmio_base
+ 0x7b4);
90 mm_write_ind(reg
, data
, 0x780, 0x780);
92 #define write_ar(num, val) mm_write_ar(p, num, val)
94 static int asiliantfb_pci_init(struct pci_dev
*dp
, const struct pci_device_id
*);
95 static int asiliantfb_check_var(struct fb_var_screeninfo
*var
,
96 struct fb_info
*info
);
97 static int asiliantfb_set_par(struct fb_info
*info
);
98 static int asiliantfb_setcolreg(u_int regno
, u_int red
, u_int green
, u_int blue
,
99 u_int transp
, struct fb_info
*info
);
101 static struct fb_ops asiliantfb_ops
= {
102 .owner
= THIS_MODULE
,
103 .fb_check_var
= asiliantfb_check_var
,
104 .fb_set_par
= asiliantfb_set_par
,
105 .fb_setcolreg
= asiliantfb_setcolreg
,
106 .fb_fillrect
= cfb_fillrect
,
107 .fb_copyarea
= cfb_copyarea
,
108 .fb_imageblit
= cfb_imageblit
,
109 .fb_cursor
= soft_cursor
,
112 /* Calculate the ratios for the dot clocks without using a single long long
114 static void asiliant_calc_dclk2(u32
*ppixclock
, u8
*dclk2_m
, u8
*dclk2_n
, u8
*dclk2_div
)
116 unsigned pixclock
= *ppixclock
;
117 unsigned Ftarget
= 1000000 * (1000000 / pixclock
);
119 unsigned best_error
= 0xffffffff;
120 unsigned best_m
= 0xffffffff,
124 unsigned char divisor
= 0;
126 /* Calculate the frequency required. This is hard enough. */
127 ratio
= 1000000 / pixclock
;
128 remainder
= 1000000 % pixclock
;
129 Ftarget
= 1000000 * ratio
+ (1000000 * remainder
) / pixclock
;
131 while (Ftarget
< 100000000) {
136 ratio
= Ftarget
/ Fref
;
137 remainder
= Ftarget
% Fref
;
139 /* This expresses the constraint that 150kHz <= Fref/n <= 5Mhz,
140 * together with 3 <= n <= 257. */
141 for (n
= 3; n
<= 257; n
++) {
142 unsigned m
= n
* ratio
+ (n
* remainder
) / Fref
;
145 if (m
>= 3 && m
<= 257) {
146 unsigned new_error
= ((Ftarget
* n
) - (Fref
* m
)) >= 0 ?
147 ((Ftarget
* n
) - (Fref
* m
)) : ((Fref
* m
) - (Ftarget
* n
));
148 if (new_error
< best_error
) {
151 best_error
= new_error
;
154 /* But if VLD = 4, then 4m <= 1028 */
155 else if (m
<= 1028) {
156 /* remember there are still only 8-bits of precision in m, so
157 * avoid over-optimistic error calculations */
158 unsigned new_error
= ((Ftarget
* n
) - (Fref
* (m
& ~3))) >= 0 ?
159 ((Ftarget
* n
) - (Fref
* (m
& ~3))) : ((Fref
* (m
& ~3)) - (Ftarget
* n
));
160 if (new_error
< best_error
) {
163 best_error
= new_error
;
168 best_m
>>= 2; /* divide m by 4, and leave VCO loop divide at 4 */
170 divisor
|= 4; /* or set VCO loop divide to 1 */
171 *dclk2_m
= best_m
- 2;
172 *dclk2_n
= best_n
- 2;
173 *dclk2_div
= divisor
;
174 *ppixclock
= pixclock
;
178 static void asiliant_set_timing(struct fb_info
*p
)
180 unsigned hd
= p
->var
.xres
/ 8;
181 unsigned hs
= (p
->var
.xres
+ p
->var
.right_margin
) / 8;
182 unsigned he
= (p
->var
.xres
+ p
->var
.right_margin
+ p
->var
.hsync_len
) / 8;
183 unsigned ht
= (p
->var
.left_margin
+ p
->var
.xres
+ p
->var
.right_margin
+ p
->var
.hsync_len
) / 8;
184 unsigned vd
= p
->var
.yres
;
185 unsigned vs
= p
->var
.yres
+ p
->var
.lower_margin
;
186 unsigned ve
= p
->var
.yres
+ p
->var
.lower_margin
+ p
->var
.vsync_len
;
187 unsigned vt
= p
->var
.upper_margin
+ p
->var
.yres
+ p
->var
.lower_margin
+ p
->var
.vsync_len
;
188 unsigned wd
= (p
->var
.xres_virtual
* ((p
->var
.bits_per_pixel
+7)/8)) / 8;
190 if ((p
->var
.xres
== 640) && (p
->var
.yres
== 480) && (p
->var
.pixclock
== 39722)) {
191 write_fr(0x01, 0x02); /* LCD */
193 write_fr(0x01, 0x01); /* CRT */
196 write_cr(0x11, (ve
- 1) & 0x0f);
197 write_cr(0x00, (ht
- 5) & 0xff);
198 write_cr(0x01, hd
- 1);
200 write_cr(0x03, ((ht
- 1) & 0x1f) | 0x80);
202 write_cr(0x05, (((ht
- 1) & 0x20) <<2) | (he
& 0x1f));
203 write_cr(0x3c, (ht
- 1) & 0xc0);
204 write_cr(0x06, (vt
- 2) & 0xff);
205 write_cr(0x30, (vt
- 2) >> 8);
206 write_cr(0x07, 0x00);
207 write_cr(0x08, 0x00);
208 write_cr(0x09, 0x00);
209 write_cr(0x10, (vs
- 1) & 0xff);
210 write_cr(0x32, ((vs
- 1) >> 8) & 0xf);
211 write_cr(0x11, ((ve
- 1) & 0x0f) | 0x80);
212 write_cr(0x12, (vd
- 1) & 0xff);
213 write_cr(0x31, ((vd
- 1) & 0xf00) >> 8);
214 write_cr(0x13, wd
& 0xff);
215 write_cr(0x41, (wd
& 0xf00) >> 8);
216 write_cr(0x15, (vs
- 1) & 0xff);
217 write_cr(0x33, ((vs
- 1) >> 8) & 0xf);
218 write_cr(0x38, ((ht
- 5) & 0x100) >> 8);
219 write_cr(0x16, (vt
- 1) & 0xff);
220 write_cr(0x18, 0x00);
222 if (p
->var
.xres
== 640) {
223 writeb(0xc7, mmio_base
+ 0x784); /* set misc output reg */
225 writeb(0x07, mmio_base
+ 0x784); /* set misc output reg */
229 static int asiliantfb_check_var(struct fb_var_screeninfo
*var
,
232 unsigned long Ftarget
, ratio
, remainder
;
234 ratio
= 1000000 / var
->pixclock
;
235 remainder
= 1000000 % var
->pixclock
;
236 Ftarget
= 1000000 * ratio
+ (1000000 * remainder
) / var
->pixclock
;
238 /* First check the constraint that the maximum post-VCO divisor is 32,
239 * and the maximum Fvco is 220MHz */
240 if (Ftarget
> 220000000 || Ftarget
< 3125000) {
241 printk(KERN_ERR
"asiliantfb dotclock must be between 3.125 and 220MHz\n");
244 var
->xres_virtual
= var
->xres
;
245 var
->yres_virtual
= var
->yres
;
247 if (var
->bits_per_pixel
== 24) {
248 var
->red
.offset
= 16;
249 var
->green
.offset
= 8;
250 var
->blue
.offset
= 0;
251 var
->red
.length
= var
->blue
.length
= var
->green
.length
= 8;
252 } else if (var
->bits_per_pixel
== 16) {
253 switch (var
->red
.offset
) {
255 var
->green
.length
= 6;
258 var
->green
.length
= 5;
263 var
->green
.offset
= 5;
264 var
->blue
.offset
= 0;
265 var
->red
.length
= var
->blue
.length
= 5;
266 } else if (var
->bits_per_pixel
== 8) {
267 var
->red
.offset
= var
->green
.offset
= var
->blue
.offset
= 0;
268 var
->red
.length
= var
->green
.length
= var
->blue
.length
= 8;
273 static int asiliantfb_set_par(struct fb_info
*p
)
275 u8 dclk2_m
; /* Holds m-2 value for register */
276 u8 dclk2_n
; /* Holds n-2 value for register */
277 u8 dclk2_div
; /* Holds divisor bitmask */
280 asiliant_calc_dclk2(&p
->var
.pixclock
, &dclk2_m
, &dclk2_n
, &dclk2_div
);
282 /* Set color depth */
283 if (p
->var
.bits_per_pixel
== 24) {
284 write_xr(0x81, 0x16); /* 24 bit packed color mode */
285 write_xr(0x82, 0x00); /* Disable palettes */
286 write_xr(0x20, 0x20); /* 24 bit blitter mode */
287 } else if (p
->var
.bits_per_pixel
== 16) {
288 if (p
->var
.red
.offset
== 11)
289 write_xr(0x81, 0x15); /* 16 bit color mode */
291 write_xr(0x81, 0x14); /* 15 bit color mode */
292 write_xr(0x82, 0x00); /* Disable palettes */
293 write_xr(0x20, 0x10); /* 16 bit blitter mode */
294 } else if (p
->var
.bits_per_pixel
== 8) {
295 write_xr(0x0a, 0x02); /* Linear */
296 write_xr(0x81, 0x12); /* 8 bit color mode */
297 write_xr(0x82, 0x00); /* Graphics gamma enable */
298 write_xr(0x20, 0x00); /* 8 bit blitter mode */
300 p
->fix
.line_length
= p
->var
.xres
* (p
->var
.bits_per_pixel
>> 3);
301 p
->fix
.visual
= (p
->var
.bits_per_pixel
== 8) ? FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_TRUECOLOR
;
302 write_xr(0xc4, dclk2_m
);
303 write_xr(0xc5, dclk2_n
);
304 write_xr(0xc7, dclk2_div
);
305 /* Set up the CR registers */
306 asiliant_set_timing(p
);
310 static int asiliantfb_setcolreg(u_int regno
, u_int red
, u_int green
, u_int blue
,
311 u_int transp
, struct fb_info
*p
)
319 /* Set hardware palete */
320 writeb(regno
, mmio_base
+ 0x790);
322 writeb(red
, mmio_base
+ 0x791);
323 writeb(green
, mmio_base
+ 0x791);
324 writeb(blue
, mmio_base
+ 0x791);
326 switch(p
->var
.bits_per_pixel
) {
329 ((u32
*)(p
->pseudo_palette
))[regno
] =
330 ((red
& 0xf8) << 7) |
331 ((green
& 0xf8) << 2) |
332 ((blue
& 0xf8) >> 3);
337 ((u32
*)(p
->pseudo_palette
))[regno
] =
338 ((red
& 0xf8) << 8) |
339 ((green
& 0xfc) << 3) |
340 ((blue
& 0xf8) >> 3);
345 ((u32
*)(p
->pseudo_palette
))[regno
] =
355 struct chips_init_reg
{
360 #define N_ELTS(x) (sizeof(x) / sizeof(x[0]))
362 static struct chips_init_reg chips_init_sr
[] =
364 {0x00, 0x03}, /* Reset register */
365 {0x01, 0x01}, /* Clocking mode */
366 {0x02, 0x0f}, /* Plane mask */
367 {0x04, 0x0e} /* Memory mode */
370 static struct chips_init_reg chips_init_gr
[] =
372 {0x03, 0x00}, /* Data rotate */
373 {0x05, 0x00}, /* Graphics mode */
374 {0x06, 0x01}, /* Miscellaneous */
375 {0x08, 0x00} /* Bit mask */
378 static struct chips_init_reg chips_init_ar
[] =
380 {0x10, 0x01}, /* Mode control */
381 {0x11, 0x00}, /* Overscan */
382 {0x12, 0x0f}, /* Memory plane enable */
383 {0x13, 0x00} /* Horizontal pixel panning */
386 static struct chips_init_reg chips_init_cr
[] =
388 {0x0c, 0x00}, /* Start address high */
389 {0x0d, 0x00}, /* Start address low */
390 {0x40, 0x00}, /* Extended Start Address */
391 {0x41, 0x00}, /* Extended Start Address */
392 {0x14, 0x00}, /* Underline location */
393 {0x17, 0xe3}, /* CRT mode control */
394 {0x70, 0x00} /* Interlace control */
398 static struct chips_init_reg chips_init_fr
[] =
440 static struct chips_init_reg chips_init_xr
[] =
442 {0xce, 0x00}, /* set default memory clock */
443 {0xcc, 200 }, /* MCLK ratio M */
444 {0xcd, 18 }, /* MCLK ratio N */
445 {0xce, 0x90}, /* MCLK divisor = 2 */
451 {0x09, 0x01}, /* IO Control - CRT controller extensions */
452 {0x0a, 0x02}, /* Frame buffer mapping */
453 {0x0b, 0x01}, /* PCI burst write */
454 {0x40, 0x03}, /* Memory access control */
455 {0x80, 0x82}, /* Pixel pipeline configuration 0 */
456 {0x81, 0x12}, /* Pixel pipeline configuration 1 */
457 {0x82, 0x08}, /* Pixel pipeline configuration 2 */
463 static void __devinit
chips_hw_init(struct fb_info
*p
)
467 for (i
= 0; i
< N_ELTS(chips_init_xr
); ++i
)
468 write_xr(chips_init_xr
[i
].addr
, chips_init_xr
[i
].data
);
469 write_xr(0x81, 0x12);
470 write_xr(0x82, 0x08);
471 write_xr(0x20, 0x00);
472 for (i
= 0; i
< N_ELTS(chips_init_sr
); ++i
)
473 write_sr(chips_init_sr
[i
].addr
, chips_init_sr
[i
].data
);
474 for (i
= 0; i
< N_ELTS(chips_init_gr
); ++i
)
475 write_gr(chips_init_gr
[i
].addr
, chips_init_gr
[i
].data
);
476 for (i
= 0; i
< N_ELTS(chips_init_ar
); ++i
)
477 write_ar(chips_init_ar
[i
].addr
, chips_init_ar
[i
].data
);
478 /* Enable video output in attribute index register */
479 writeb(0x20, mmio_base
+ 0x780);
480 for (i
= 0; i
< N_ELTS(chips_init_cr
); ++i
)
481 write_cr(chips_init_cr
[i
].addr
, chips_init_cr
[i
].data
);
482 for (i
= 0; i
< N_ELTS(chips_init_fr
); ++i
)
483 write_fr(chips_init_fr
[i
].addr
, chips_init_fr
[i
].data
);
486 static struct fb_fix_screeninfo asiliantfb_fix __devinitdata
= {
487 .id
= "Asiliant 69000",
488 .type
= FB_TYPE_PACKED_PIXELS
,
489 .visual
= FB_VISUAL_PSEUDOCOLOR
,
490 .accel
= FB_ACCEL_NONE
,
492 .smem_len
= 0x200000, /* 2MB */
495 static struct fb_var_screeninfo asiliantfb_var __devinitdata
= {
501 .red
= { .length
= 8 },
502 .green
= { .length
= 8 },
503 .blue
= { .length
= 8 },
506 .vmode
= FB_VMODE_NONINTERLACED
,
516 static void __devinit
init_asiliant(struct fb_info
*p
, unsigned long addr
)
518 p
->fix
= asiliantfb_fix
;
519 p
->fix
.smem_start
= addr
;
520 p
->var
= asiliantfb_var
;
521 p
->fbops
= &asiliantfb_ops
;
522 p
->flags
= FBINFO_DEFAULT
;
524 fb_alloc_cmap(&p
->cmap
, 256, 0);
526 if (register_framebuffer(p
) < 0) {
527 printk(KERN_ERR
"C&T 69000 framebuffer failed to register\n");
531 printk(KERN_INFO
"fb%d: Asiliant 69000 frame buffer (%dK RAM detected)\n",
532 p
->node
, p
->fix
.smem_len
/ 1024);
534 writeb(0xff, mmio_base
+ 0x78c);
539 asiliantfb_pci_init(struct pci_dev
*dp
, const struct pci_device_id
*ent
)
541 unsigned long addr
, size
;
544 if ((dp
->resource
[0].flags
& IORESOURCE_MEM
) == 0)
546 addr
= pci_resource_start(dp
, 0);
547 size
= pci_resource_len(dp
, 0);
550 if (!request_mem_region(addr
, size
, "asiliantfb"))
553 p
= framebuffer_alloc(sizeof(u32
) * 256, &dp
->dev
);
555 release_mem_region(addr
, size
);
558 p
->pseudo_palette
= p
->par
;
561 p
->screen_base
= ioremap(addr
, 0x800000);
562 if (p
->screen_base
== NULL
) {
563 release_mem_region(addr
, size
);
564 framebuffer_release(p
);
568 pci_write_config_dword(dp
, 4, 0x02800083);
569 writeb(3, p
->screen_base
+ 0x400784);
571 init_asiliant(p
, addr
);
573 pci_set_drvdata(dp
, p
);
577 static void __devexit
asiliantfb_remove(struct pci_dev
*dp
)
579 struct fb_info
*p
= pci_get_drvdata(dp
);
581 unregister_framebuffer(p
);
582 iounmap(p
->screen_base
);
583 release_mem_region(pci_resource_start(dp
, 0), pci_resource_len(dp
, 0));
584 pci_set_drvdata(dp
, NULL
);
585 framebuffer_release(p
);
588 static struct pci_device_id asiliantfb_pci_tbl
[] __devinitdata
= {
589 { PCI_VENDOR_ID_CT
, PCI_DEVICE_ID_CT_69000
, PCI_ANY_ID
, PCI_ANY_ID
},
593 MODULE_DEVICE_TABLE(pci
, asiliantfb_pci_tbl
);
595 static struct pci_driver asiliantfb_driver
= {
596 .name
= "asiliantfb",
597 .id_table
= asiliantfb_pci_tbl
,
598 .probe
= asiliantfb_pci_init
,
599 .remove
= __devexit_p(asiliantfb_remove
),
602 static int __init
asiliantfb_init(void)
604 if (fb_get_options("asiliantfb", NULL
))
607 return pci_register_driver(&asiliantfb_driver
);
610 module_init(asiliantfb_init
);
612 static void __exit
asiliantfb_exit(void)
614 pci_unregister_driver(&asiliantfb_driver
);
617 MODULE_LICENSE("GPL");