projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 3070033a SH |
1 | /* |
| 2 | * This file is subject to the terms and conditions of the GNU General Public | |
| 3 | * License. See the file "COPYING" in the main directory of this archive | |
| 4 | * for more details. | |
| 5 | * | |
| 6 | * Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved. | |
| 7 | */ | |
| 8 | #include <linux/timer.h> | |
| 9 | #include <linux/io.h> | |
| 10 | #include <asm/mips-boards/generic.h> | |
| 11 | #include <asm/mips-boards/prom.h> | |
| 12 | ||
| 13 | static unsigned int display_count; | |
| 14 | static unsigned int max_display_count; | |
| 15 | ||
| 16 | #define LCD_DISPLAY_POS_BASE 0x1f000400 | |
| 17 | #define DISPLAY_LCDINSTRUCTION (0*2) | |
| 18 | #define DISPLAY_LCDDATA (1*2) | |
| 19 | #define DISPLAY_CPLDSTATUS (2*2) | |
| 20 | #define DISPLAY_CPLDDATA (3*2) | |
| 21 | #define LCD_SETDDRAM 0x80 | |
| 22 | #define LCD_IR_BF 0x80 | |
| 23 | ||
| 24 | const char display_string[] = " LINUX ON SEAD3 "; | |
| 25 | ||
| 26 | static void scroll_display_message(unsigned long data); | |
| 27 | static DEFINE_TIMER(mips_scroll_timer, scroll_display_message, HZ, 0); | |
| 28 | ||
| 29 | static void lcd_wait(unsigned int __iomem *display) | |
| 30 | { | |
| 31 | /* Wait for CPLD state machine to become idle. */ | |
| 32 | do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1); | |
| 33 | ||
| 34 | do { | |
| 35 | __raw_readl(display + DISPLAY_LCDINSTRUCTION); | |
| 36 | ||
| 37 | /* Wait for CPLD state machine to become idle. */ | |
| 38 | do { } while (__raw_readl(display + DISPLAY_CPLDSTATUS) & 1); | |
| 39 | } while (__raw_readl(display + DISPLAY_CPLDDATA) & LCD_IR_BF); | |
| 40 | } | |
| 41 | ||
| 42 | void mips_display_message(const char *str) | |
| 43 | { | |
| 44 | static unsigned int __iomem *display; | |
| 45 | char ch; | |
| 46 | int i; | |
| 47 | ||
| 48 | if (unlikely(display == NULL)) | |
| 49 | display = ioremap_nocache(LCD_DISPLAY_POS_BASE, | |
| 50 | (8 * sizeof(int))); | |
| 51 | ||
| 52 | for (i = 0; i < 16; i++) { | |
| 53 | if (*str) | |
| 54 | ch = *str++; | |
| 55 | else | |
| 56 | ch = ' '; | |
| 57 | lcd_wait(display); | |
| 58 | __raw_writel((LCD_SETDDRAM | i), | |
| 59 | (display + DISPLAY_LCDINSTRUCTION)); | |
| 60 | lcd_wait(display); | |
| 61 | __raw_writel(ch, display + DISPLAY_LCDDATA); | |
| 62 | } | |
| 63 | } | |
| 64 | ||
| 65 | static void scroll_display_message(unsigned long data) | |
| 66 | { | |
| 67 | mips_display_message(&display_string[display_count++]); | |
| 68 | if (display_count == max_display_count) | |
| 69 | display_count = 0; | |
| 70 | mod_timer(&mips_scroll_timer, jiffies + HZ); | |
| 71 | } | |
| 72 | ||
| 73 | void mips_scroll_message(void) | |
| 74 | { | |
| 75 | del_timer_sync(&mips_scroll_timer); | |
| 76 | max_display_count = strlen(display_string) + 1 - 16; | |
| 77 | mod_timer(&mips_scroll_timer, jiffies + 1); | |
| 78 | } |