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ubb-vga: new option -2 to keep on refreshing the LCD display (experimental)

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"Experimental" means that it doesn't seem to work at the moment.

- regs4740.h (_LCD, LCDCTRL): added the LCD control register
- ubb-vga.c (old_lcdctrl, tame_lcd, restore_lcd): make the LCD controller
  use short bursts, to reduce the bus access latency for other users
- ubb-vga.c (keep_lcd, setup_noirq, cleanup_noirq, usage, main): new
  option -2 to keep on refreshing the LCD display
This commit is contained in:
Werner Almesberger
2011-05-06 20:19:13 -03:00
parent f7e8fbbaea
commit ba1d297643
2 changed files with 33 additions and 4 deletions
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3
ubb-vga/regs4740.h
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@@ -30,6 +30,7 @@
#define _GPIO(n) REG(0x0010000+(n))
#define _MSC(n) REG(0x0021000+(n))
#define _DMAC(n) REG(0x3020000+(n))
#define _LCD(n) REG(0x3050000+(n))
#define CLKGR _CGU(0x0020) /* Clock Gate */
#define MSCCDR _CGU(0x0068) /* MSC device clock divider */
@@ -80,4 +81,6 @@
#define DMAC _DMAC(0x300) /* DMA control */
#define DDR _DMAC(0x308) /* DMA doorbell */
#define LCDCTRL _LCD(0x30) /* LCD control */
#endif /* !REGS4740_H */