[openfirmware] [commit] r2757 - cpu/arm/olpc/3.0

[repository service]

Author: wmb
Date: Thu Dec  8 13:43:55 2011
New Revision: 2757
URL: http://tracker.coreboot.org/trac/openfirmware/changeset/2757

Log:
OLPC XO-3 - Support new LCD power GPIOS.

Modified:
   cpu/arm/olpc/3.0/lcdcfg.fth

Modified: cpu/arm/olpc/3.0/lcdcfg.fth
==============================================================================
--- cpu/arm/olpc/3.0/lcdcfg.fth	Thu Dec  8 13:43:50 2011	(r2756)
+++ cpu/arm/olpc/3.0/lcdcfg.fth	Thu Dec  8 13:43:55 2011	(r2757)
@@ -32,9 +32,21 @@
 alias depth  bpp
 width >bytes constant /scanline  
 
-: bright!  ( level -- )  drop  ;
-: backlight-on  ( -- )  ;
-: backlight-off  ( -- )  ;
+: bright!  ( level -- )  d# 15 min  h# 11 *  h# 1a404 io!  ;
+: backlight-on  ( -- )  d# 15 bright!  ;
+: backlight-off  ( -- )  0 bright!  ;
+: setup-pwm2  ( -- )
+   7 h# 1503c io!  3 h# 1503c io!  \ Turn on the PWM1 clock and release reset - PWM2 depends on it
+   7 h# 15040 io!  3 h# 15040 io!  \ Turn on the PWM2 clock and release reset
+   h#  3f h# 1a400 io!  \ Prescaler value 63, 26MHz / 64 = 406 kHz
+   h# 100 h# 1a408 io!  \ Full period is 256 clocks
+\   backlight-off
+   d# 15 bright!
+   3 sleep0 d# 49 af!         \ Switch over to PWM control of the pin
+   d# 138 gpio-set
+   d# 138 gpio-dir-out
+;
+
 : lcd-power-on  ( -- )
    d# 138 gpio-set   \ LCDVCC_EN
    d# 135 gpio-set   \ STBY#
@@ -47,9 +59,10 @@
    d# 130 gpio-set   \ LCD_RESET#  (end of pulse)
 
    d# 120 ms
+   setup-pwm2
    backlight-on
 ;
-: init-xo-display  ;  \ CForth has already turned it on
+: init-xo-display  ( -- )   ;  \ CForth has already turned it on
 
 : set-source  ( flag -- )  drop  ;  \ No DCON
 true constant vga?  \ No DCON, hence never frozen