1 /* Geode LX framebuffer driver
3 * Copyright (C) 2006-2007, Advanced Micro Devices,Inc.
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
11 #include <linux/kernel.h>
12 #include <linux/errno.h>
14 #include <linux/uaccess.h>
15 #include <linux/delay.h>
16 #include <asm/geode.h>
21 * Support panel scaling
23 * Add support for interlacing (TV out)
27 /* This is the complete list of PLL frequencies that we can set -
28 * we will choose the closest match to the incoming clock.
29 * freq is the frequency of the dotclock * 1000 (for example,
30 * 24823 = 24.983 Mhz).
31 * pllval is the corresponding PLL value
51 { 0x00010045, 10000 },
52 { 0x00010089, 10791 },
53 { 0x000110E7, 11225 },
54 { 0x00012136, 11430 },
55 { 0x00013207, 12375 },
56 { 0x00012187, 12500 },
57 { 0x00014286, 14063 },
58 { 0x000110E5, 15016 },
59 { 0x00014214, 16250 },
60 { 0x00011105, 17045 },
61 { 0x000131E4, 18563 },
62 { 0x00013183, 18750 },
63 { 0x00014284, 19688 },
64 { 0x00011104, 20400 },
65 { 0x00016363, 23625 },
66 { 0x00015303, 24380 },
67 { 0x000031AC, 24923 },
68 { 0x0000215D, 25175 },
69 { 0x00001087, 27000 },
70 { 0x0000216C, 28322 },
71 { 0x0000218D, 28560 },
72 { 0x00010041, 29913 },
73 { 0x000010C9, 31200 },
74 { 0x00003147, 31500 },
75 { 0x000141A1, 32400 },
76 { 0x000010A7, 33032 },
77 { 0x00012182, 33375 },
78 { 0x000141B1, 33750 },
79 { 0x00002159, 35112 },
80 { 0x00004249, 35500 },
81 { 0x00000057, 36000 },
82 { 0x000141E1, 37125 },
83 { 0x0000219A, 37889 },
84 { 0x00002158, 39168 },
85 { 0x00000045, 40000 },
86 { 0x000131A1, 40500 },
87 { 0x00010061, 42301 },
88 { 0x00000089, 43163 },
89 { 0x00012151, 43875 },
90 { 0x000010E7, 44900 },
91 { 0x00002136, 45720 },
92 { 0x000152E1, 47250 },
93 { 0x00010071, 48000 },
94 { 0x00003207, 49500 },
95 { 0x00002187, 50000 },
96 { 0x00014291, 50625 },
97 { 0x00011101, 51188 },
98 { 0x00017481, 54563 },
99 { 0x00004286, 56250 },
100 { 0x00014170, 57375 },
101 { 0x00016210, 58500 },
102 { 0x000010E5, 60065 },
103 { 0x00013140, 62796 },
104 { 0x00004214, 65000 },
105 { 0x00016250, 65250 },
106 { 0x00001105, 68179 },
107 { 0x000141C0, 69600 },
108 { 0x00015220, 70160 },
109 { 0x00010050, 72000 },
110 { 0x000031E4, 74250 },
111 { 0x00003183, 75000 },
112 { 0x00004284, 78750 },
113 { 0x00012130, 80052 },
114 { 0x00001104, 81600 },
115 { 0x00006363, 94500 },
116 { 0x00005303, 97520 },
117 { 0x00002183, 100187 },
118 { 0x00002122, 101420 },
119 { 0x00001081, 108000 },
120 { 0x00006201, 113310 },
121 { 0x00000041, 119650 },
122 { 0x000041A1, 129600 },
123 { 0x00002182, 133500 },
124 { 0x000041B1, 135000 },
125 { 0x00000051, 144000 },
126 { 0x000041E1, 148500 },
127 { 0x000062D1, 157500 },
128 { 0x000031A1, 162000 },
129 { 0x00000061, 169203 },
130 { 0x00004231, 172800 },
131 { 0x00002151, 175500 },
132 { 0x000052E1, 189000 },
133 { 0x00000071, 192000 },
134 { 0x00003201, 198000 },
135 { 0x00004291, 202500 },
136 { 0x00001101, 204750 },
137 { 0x00007481, 218250 },
138 { 0x00004170, 229500 },
139 { 0x00006210, 234000 },
140 { 0x00003140, 251182 },
141 { 0x00006250, 261000 },
142 { 0x000041C0, 278400 },
143 { 0x00005220, 280640 },
144 { 0x00000050, 288000 },
145 { 0x000041E0, 297000 },
146 { 0x00002130, 320207 }
150 static void lx_set_dotpll(u32 pllval
)
152 u32 dotpll_lo
, dotpll_hi
;
155 rdmsr(MSR_GLCP_DOTPLL
, dotpll_lo
, dotpll_hi
);
157 if ((dotpll_lo
& GLCP_DOTPLL_LOCK
) && (dotpll_hi
== pllval
))
161 dotpll_lo
&= ~(GLCP_DOTPLL_BYPASS
| GLCP_DOTPLL_HALFPIX
);
162 dotpll_lo
|= GLCP_DOTPLL_RESET
;
164 wrmsr(MSR_GLCP_DOTPLL
, dotpll_lo
, dotpll_hi
);
166 /* Wait 100us for the PLL to lock */
170 /* Now, loop for the lock bit */
172 for (i
= 0; i
< 1000; i
++) {
173 rdmsr(MSR_GLCP_DOTPLL
, dotpll_lo
, dotpll_hi
);
174 if (dotpll_lo
& GLCP_DOTPLL_LOCK
)
178 /* Clear the reset bit */
180 dotpll_lo
&= ~GLCP_DOTPLL_RESET
;
181 wrmsr(MSR_GLCP_DOTPLL
, dotpll_lo
, dotpll_hi
);
184 /* Set the clock based on the frequency specified by the current mode */
186 static void lx_set_clock(struct fb_info
*info
)
188 unsigned int diff
, min
, best
= 0;
189 unsigned int freq
, i
;
191 freq
= (unsigned int) (1000000000 / info
->var
.pixclock
);
193 min
= abs(pll_table
[0].freq
- freq
);
195 for (i
= 0; i
< ARRAY_SIZE(pll_table
); i
++) {
196 diff
= abs(pll_table
[i
].freq
- freq
);
203 lx_set_dotpll(pll_table
[best
].pllval
& 0x00017FFF);
206 static void lx_graphics_disable(struct fb_info
*info
)
208 struct lxfb_par
*par
= info
->par
;
209 unsigned int val
, gcfg
;
211 /* Note: This assumes that the video is in a quitet state */
213 write_vp(par
, VP_A1T
, 0);
214 write_vp(par
, VP_A2T
, 0);
215 write_vp(par
, VP_A3T
, 0);
217 /* Turn off the VGA and video enable */
218 val
= read_dc(par
, DC_GENERAL_CFG
) & ~(DC_GENERAL_CFG_VGAE
|
219 DC_GENERAL_CFG_VIDE
);
221 write_dc(par
, DC_GENERAL_CFG
, val
);
223 val
= read_vp(par
, VP_VCFG
) & ~VP_VCFG_VID_EN
;
224 write_vp(par
, VP_VCFG
, val
);
226 write_dc(par
, DC_IRQ
, DC_IRQ_MASK
| DC_IRQ_VIP_VSYNC_LOSS_IRQ_MASK
|
227 DC_IRQ_STATUS
| DC_IRQ_VIP_VSYNC_IRQ_STATUS
);
229 val
= read_dc(par
, DC_GENLK_CTL
) & ~DC_GENLK_CTL_GENLK_EN
;
230 write_dc(par
, DC_GENLK_CTL
, val
);
232 val
= read_dc(par
, DC_CLR_KEY
);
233 write_dc(par
, DC_CLR_KEY
, val
& ~DC_CLR_KEY_CLR_KEY_EN
);
235 /* We don't actually blank the panel, due to the long latency
236 involved with bringing it back */
238 val
= read_vp(par
, VP_MISC
) | VP_MISC_DACPWRDN
;
239 write_vp(par
, VP_MISC
, val
);
241 /* Turn off the display */
243 val
= read_vp(par
, VP_DCFG
);
244 write_vp(par
, VP_DCFG
, val
& ~(VP_DCFG_CRT_EN
| VP_DCFG_HSYNC_EN
|
245 VP_DCFG_VSYNC_EN
| VP_DCFG_DAC_BL_EN
));
247 gcfg
= read_dc(par
, DC_GENERAL_CFG
);
248 gcfg
&= ~(DC_GENERAL_CFG_CMPE
| DC_GENERAL_CFG_DECE
);
249 write_dc(par
, DC_GENERAL_CFG
, gcfg
);
251 /* Turn off the TGEN */
252 val
= read_dc(par
, DC_DISPLAY_CFG
);
253 val
&= ~DC_DISPLAY_CFG_TGEN
;
254 write_dc(par
, DC_DISPLAY_CFG
, val
);
256 /* Wait 1000 usecs to ensure that the TGEN is clear */
259 /* Turn off the FIFO loader */
261 gcfg
&= ~DC_GENERAL_CFG_DFLE
;
262 write_dc(par
, DC_GENERAL_CFG
, gcfg
);
264 /* Lastly, wait for the GP to go idle */
267 val
= read_gp(par
, GP_BLT_STATUS
);
268 } while ((val
& GP_BLT_STATUS_PB
) || !(val
& GP_BLT_STATUS_CE
));
271 static void lx_graphics_enable(struct fb_info
*info
)
273 struct lxfb_par
*par
= info
->par
;
276 /* Set the video request register */
277 write_vp(par
, VP_VRR
, 0);
279 /* Set up the polarities */
281 config
= read_vp(par
, VP_DCFG
);
283 config
&= ~(VP_DCFG_CRT_SYNC_SKW
| VP_DCFG_PWR_SEQ_DELAY
|
284 VP_DCFG_CRT_HSYNC_POL
| VP_DCFG_CRT_VSYNC_POL
);
286 config
|= (VP_DCFG_CRT_SYNC_SKW_DEFAULT
| VP_DCFG_PWR_SEQ_DELAY_DEFAULT
289 if (info
->var
.sync
& FB_SYNC_HOR_HIGH_ACT
)
290 config
|= VP_DCFG_CRT_HSYNC_POL
;
292 if (info
->var
.sync
& FB_SYNC_VERT_HIGH_ACT
)
293 config
|= VP_DCFG_CRT_VSYNC_POL
;
295 if (par
->output
& OUTPUT_PANEL
) {
298 write_fp(par
, FP_PT1
, 0);
299 write_fp(par
, FP_PT2
, FP_PT2_SCRC
);
300 write_fp(par
, FP_DFC
, FP_DFC_BC
);
302 msrlo
= DF_DEFAULT_TFT_PAD_SEL_LOW
;
303 msrhi
= DF_DEFAULT_TFT_PAD_SEL_HIGH
;
305 wrmsr(MSR_LX_MSR_PADSEL
, msrlo
, msrhi
);
308 if (par
->output
& OUTPUT_CRT
) {
309 config
|= VP_DCFG_CRT_EN
| VP_DCFG_HSYNC_EN
|
310 VP_DCFG_VSYNC_EN
| VP_DCFG_DAC_BL_EN
;
313 write_vp(par
, VP_DCFG
, config
);
315 /* Turn the CRT dacs back on */
317 if (par
->output
& OUTPUT_CRT
) {
318 temp
= read_vp(par
, VP_MISC
);
319 temp
&= ~(VP_MISC_DACPWRDN
| VP_MISC_APWRDN
);
320 write_vp(par
, VP_MISC
, temp
);
323 /* Turn the panel on (if it isn't already) */
325 if (par
->output
& OUTPUT_PANEL
) {
326 temp
= read_fp(par
, FP_PM
);
329 write_fp(par
, FP_PM
, temp
| FP_PM_P
);
333 unsigned int lx_framebuffer_size(void)
337 /* The frame buffer size is reported by a VSM in VSA II */
338 /* Virtual Register Class = 0x02 */
339 /* VG_MEM_SIZE (1MB units) = 0x00 */
341 outw(0xFC53, 0xAC1C);
342 outw(0x0200, 0xAC1C);
344 val
= (unsigned int)(inw(0xAC1E)) & 0xFE;
348 void lx_set_mode(struct fb_info
*info
)
350 struct lxfb_par
*par
= info
->par
;
353 unsigned int max
, dv
, val
, size
;
355 unsigned int gcfg
, dcfg
;
356 int hactive
, hblankstart
, hsyncstart
, hsyncend
, hblankend
, htotal
;
357 int vactive
, vblankstart
, vsyncstart
, vsyncend
, vblankend
, vtotal
;
359 /* Unlock the DC registers */
360 write_dc(par
, DC_UNLOCK
, DC_UNLOCK_UNLOCK
);
362 lx_graphics_disable(info
);
366 /* Set output mode */
368 rdmsrl(MSR_LX_GLD_MSR_CONFIG
, msrval
);
369 msrval
&= ~DF_CONFIG_OUTPUT_MASK
;
371 if (par
->output
& OUTPUT_PANEL
) {
372 msrval
|= DF_OUTPUT_PANEL
;
374 if (par
->output
& OUTPUT_CRT
)
375 msrval
|= DF_SIMULTANEOUS_CRT_AND_FP
;
377 msrval
&= ~DF_SIMULTANEOUS_CRT_AND_FP
;
379 msrval
|= DF_OUTPUT_CRT
;
382 wrmsrl(MSR_LX_GLD_MSR_CONFIG
, msrval
);
384 /* Clear the various buffers */
385 /* FIXME: Adjust for panning here */
387 write_dc(par
, DC_FB_ST_OFFSET
, 0);
388 write_dc(par
, DC_CB_ST_OFFSET
, 0);
389 write_dc(par
, DC_CURS_ST_OFFSET
, 0);
391 /* FIXME: Add support for interlacing */
392 /* FIXME: Add support for scaling */
394 val
= read_dc(par
, DC_GENLK_CTL
);
395 val
&= ~(DC_GENLK_CTL_ALPHA_FLICK_EN
| DC_GENLK_CTL_FLICK_EN
|
396 DC_GENLK_CTL_FLICK_SEL_MASK
);
398 /* Default scaling params */
400 write_dc(par
, DC_GFX_SCALE
, (0x4000 << 16) | 0x4000);
401 write_dc(par
, DC_IRQ_FILT_CTL
, 0);
402 write_dc(par
, DC_GENLK_CTL
, val
);
404 /* FIXME: Support compression */
406 if (info
->fix
.line_length
> 4096)
407 dv
= DC_DV_CTL_DV_LINE_SIZE_8K
;
408 else if (info
->fix
.line_length
> 2048)
409 dv
= DC_DV_CTL_DV_LINE_SIZE_4K
;
410 else if (info
->fix
.line_length
> 1024)
411 dv
= DC_DV_CTL_DV_LINE_SIZE_2K
;
413 dv
= DC_DV_CTL_DV_LINE_SIZE_1K
;
415 max
= info
->fix
.line_length
* info
->var
.yres
;
416 max
= (max
+ 0x3FF) & 0xFFFFFC00;
418 write_dc(par
, DC_DV_TOP
, max
| DC_DV_TOP_DV_TOP_EN
);
420 val
= read_dc(par
, DC_DV_CTL
) & ~DC_DV_CTL_DV_LINE_SIZE
;
421 write_dc(par
, DC_DV_CTL
, val
| dv
);
423 size
= info
->var
.xres
* (info
->var
.bits_per_pixel
>> 3);
425 write_dc(par
, DC_GFX_PITCH
, info
->fix
.line_length
>> 3);
426 write_dc(par
, DC_LINE_SIZE
, (size
+ 7) >> 3);
428 /* Set default watermark values */
430 rdmsrl(MSR_LX_SPARE_MSR
, msrval
);
432 msrval
&= ~(DC_SPARE_DISABLE_CFIFO_HGO
| DC_SPARE_VFIFO_ARB_SELECT
|
433 DC_SPARE_LOAD_WM_LPEN_MASK
| DC_SPARE_WM_LPEN_OVRD
|
434 DC_SPARE_DISABLE_INIT_VID_PRI
| DC_SPARE_DISABLE_VFIFO_WM
);
435 msrval
|= DC_SPARE_DISABLE_VFIFO_WM
| DC_SPARE_DISABLE_INIT_VID_PRI
;
436 wrmsrl(MSR_LX_SPARE_MSR
, msrval
);
438 gcfg
= DC_GENERAL_CFG_DFLE
; /* Display fifo enable */
439 gcfg
|= (0x6 << DC_GENERAL_CFG_DFHPSL_SHIFT
) | /* default priority */
440 (0xb << DC_GENERAL_CFG_DFHPEL_SHIFT
);
441 gcfg
|= DC_GENERAL_CFG_FDTY
; /* Set the frame dirty mode */
443 dcfg
= DC_DISPLAY_CFG_VDEN
; /* Enable video data */
444 dcfg
|= DC_DISPLAY_CFG_GDEN
; /* Enable graphics */
445 dcfg
|= DC_DISPLAY_CFG_TGEN
; /* Turn on the timing generator */
446 dcfg
|= DC_DISPLAY_CFG_TRUP
; /* Update timings immediately */
447 dcfg
|= DC_DISPLAY_CFG_PALB
; /* Palette bypass in > 8 bpp modes */
448 dcfg
|= DC_DISPLAY_CFG_VISL
;
449 dcfg
|= DC_DISPLAY_CFG_DCEN
; /* Always center the display */
451 /* Set the current BPP mode */
453 switch (info
->var
.bits_per_pixel
) {
455 dcfg
|= DC_DISPLAY_CFG_DISP_MODE_8BPP
;
459 dcfg
|= DC_DISPLAY_CFG_DISP_MODE_16BPP
;
464 dcfg
|= DC_DISPLAY_CFG_DISP_MODE_24BPP
;
468 /* Now - set up the timings */
470 hactive
= info
->var
.xres
;
471 hblankstart
= hactive
;
472 hsyncstart
= hblankstart
+ info
->var
.right_margin
;
473 hsyncend
= hsyncstart
+ info
->var
.hsync_len
;
474 hblankend
= hsyncend
+ info
->var
.left_margin
;
477 vactive
= info
->var
.yres
;
478 vblankstart
= vactive
;
479 vsyncstart
= vblankstart
+ info
->var
.lower_margin
;
480 vsyncend
= vsyncstart
+ info
->var
.vsync_len
;
481 vblankend
= vsyncend
+ info
->var
.upper_margin
;
484 write_dc(par
, DC_H_ACTIVE_TIMING
, (hactive
- 1) | ((htotal
- 1) << 16));
485 write_dc(par
, DC_H_BLANK_TIMING
,
486 (hblankstart
- 1) | ((hblankend
- 1) << 16));
487 write_dc(par
, DC_H_SYNC_TIMING
,
488 (hsyncstart
- 1) | ((hsyncend
- 1) << 16));
490 write_dc(par
, DC_V_ACTIVE_TIMING
, (vactive
- 1) | ((vtotal
- 1) << 16));
491 write_dc(par
, DC_V_BLANK_TIMING
,
492 (vblankstart
- 1) | ((vblankend
- 1) << 16));
493 write_dc(par
, DC_V_SYNC_TIMING
,
494 (vsyncstart
- 1) | ((vsyncend
- 1) << 16));
496 write_dc(par
, DC_FB_ACTIVE
,
497 (info
->var
.xres
- 1) << 16 | (info
->var
.yres
- 1));
499 /* And re-enable the graphics output */
500 lx_graphics_enable(info
);
502 /* Write the two main configuration registers */
503 write_dc(par
, DC_DISPLAY_CFG
, dcfg
);
504 write_dc(par
, DC_ARB_CFG
, 0);
505 write_dc(par
, DC_GENERAL_CFG
, gcfg
);
507 /* Lock the DC registers */
508 write_dc(par
, DC_UNLOCK
, DC_UNLOCK_LOCK
);
511 void lx_set_palette_reg(struct fb_info
*info
, unsigned regno
,
512 unsigned red
, unsigned green
, unsigned blue
)
514 struct lxfb_par
*par
= info
->par
;
517 /* Hardware palette is in RGB 8-8-8 format. */
519 val
= (red
<< 8) & 0xff0000;
520 val
|= (green
) & 0x00ff00;
521 val
|= (blue
>> 8) & 0x0000ff;
523 write_dc(par
, DC_PAL_ADDRESS
, regno
);
524 write_dc(par
, DC_PAL_DATA
, val
);
527 int lx_blank_display(struct fb_info
*info
, int blank_mode
)
529 struct lxfb_par
*par
= info
->par
;
531 int blank
, hsync
, vsync
;
533 /* CRT power saving modes. */
534 switch (blank_mode
) {
535 case FB_BLANK_UNBLANK
:
536 blank
= 0; hsync
= 1; vsync
= 1;
538 case FB_BLANK_NORMAL
:
539 blank
= 1; hsync
= 1; vsync
= 1;
541 case FB_BLANK_VSYNC_SUSPEND
:
542 blank
= 1; hsync
= 1; vsync
= 0;
544 case FB_BLANK_HSYNC_SUSPEND
:
545 blank
= 1; hsync
= 0; vsync
= 1;
547 case FB_BLANK_POWERDOWN
:
548 blank
= 1; hsync
= 0; vsync
= 0;
554 dcfg
= read_vp(par
, VP_DCFG
);
555 dcfg
&= ~(VP_DCFG_DAC_BL_EN
| VP_DCFG_HSYNC_EN
| VP_DCFG_VSYNC_EN
);
557 dcfg
|= VP_DCFG_DAC_BL_EN
;
559 dcfg
|= VP_DCFG_HSYNC_EN
;
561 dcfg
|= VP_DCFG_VSYNC_EN
;
562 write_vp(par
, VP_DCFG
, dcfg
);
564 /* Power on/off flat panel */
566 if (par
->output
& OUTPUT_PANEL
) {
567 fp_pm
= read_fp(par
, FP_PM
);
568 if (blank_mode
== FB_BLANK_POWERDOWN
)
572 write_fp(par
, FP_PM
, fp_pm
);