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Diffstat (limited to 'include/asm-arm/arch-s3c2410/uncompress.h')
| -rw-r--r-- | include/asm-arm/arch-s3c2410/uncompress.h | 158 |
1 files changed, 158 insertions, 0 deletions
diff --git a/include/asm-arm/arch-s3c2410/uncompress.h b/include/asm-arm/arch-s3c2410/uncompress.h new file mode 100644 index 000000000000..ad4252e27799 --- /dev/null +++ b/include/asm-arm/arch-s3c2410/uncompress.h @@ -0,0 +1,158 @@ +/* linux/include/asm-arm/arch-s3c2410/uncompress.h + * + * (c) 2003 Simtec Electronics + * Ben Dooks <ben@simtec.co.uk> + * + * S3C2410 - uncompress code + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Changelog: + * 22-May-2003 BJD Created + * 08-Sep-2003 BJD Moved to linux v2.6 + * 12-Mar-2004 BJD Updated header protection + * 12-Oct-2004 BJD Take account of debug uart configuration + * 15-Nov-2004 BJD Fixed uart configuration + * 22-Feb-2005 BJD Added watchdog to uncompress +*/ + +#ifndef __ASM_ARCH_UNCOMPRESS_H +#define __ASM_ARCH_UNCOMPRESS_H + +#include <linux/config.h> + +/* defines for UART registers */ +#include "asm/arch/regs-serial.h" +#include "asm/arch/regs-gpio.h" +#include "asm/arch/regs-watchdog.h" + +#include <asm/arch/map.h> + +/* working in physical space... */ +#undef S3C2410_GPIOREG +#undef S3C2410_WDOGREG + +#define S3C2410_GPIOREG(x) ((S3C2410_PA_GPIO + (x))) +#define S3C2410_WDOGREG(x) ((S3C2410_PA_WATCHDOG + (x))) + +/* how many bytes we allow into the FIFO at a time in FIFO mode */ +#define FIFO_MAX (14) + +#define uart_base S3C2410_PA_UART + (0x4000*CONFIG_S3C2410_LOWLEVEL_UART_PORT) + +static __inline__ void +uart_wr(unsigned int reg, unsigned int val) +{ + volatile unsigned int *ptr; + + ptr = (volatile unsigned int *)(reg + uart_base); + *ptr = val; +} + +static __inline__ unsigned int +uart_rd(unsigned int reg) +{ + volatile unsigned int *ptr; + + ptr = (volatile unsigned int *)(reg + uart_base); + return *ptr; +} + + +/* we can deal with the case the UARTs are being run + * in FIFO mode, so that we don't hold up our execution + * waiting for tx to happen... +*/ + +static void +putc(char ch) +{ + int cpuid = *((volatile unsigned int *)S3C2410_GSTATUS1); + + cpuid &= S3C2410_GSTATUS1_IDMASK; + + if (ch == '\n') + putc('\r'); /* expand newline to \r\n */ + + if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) { + int level; + + while (1) { + level = uart_rd(S3C2410_UFSTAT); + + if (cpuid == S3C2410_GSTATUS1_2440) { + level &= S3C2440_UFSTAT_TXMASK; + level >>= S3C2440_UFSTAT_TXSHIFT; + } else { + level &= S3C2410_UFSTAT_TXMASK; + level >>= S3C2410_UFSTAT_TXSHIFT; + } + + if (level < FIFO_MAX) + break; + } + + } else { + /* not using fifos */ + + while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE); + } + + /* write byte to transmission register */ + uart_wr(S3C2410_UTXH, ch); +} + +static void +putstr(const char *ptr) +{ + for (; *ptr != '\0'; ptr++) { + putc(*ptr); + } +} + +/* CONFIG_S3C2410_BOOT_WATCHDOG + * + * Simple boot-time watchdog setup, to reboot the system if there is + * any problem with the boot process +*/ + +#ifdef CONFIG_S3C2410_BOOT_WATCHDOG + +#define WDOG_COUNT (0xff00) + +#define __raw_writel(d,ad) do { *((volatile unsigned int *)(ad)) = (d); } while(0) + +static inline void arch_decomp_wdog(void) +{ + __raw_writel(WDOG_COUNT, S3C2410_WTCNT); +} + +static void arch_decomp_wdog_start(void) +{ + __raw_writel(WDOG_COUNT, S3C2410_WTDAT); + __raw_writel(WDOG_COUNT, S3C2410_WTCNT); + __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON); +} + +#else +#define arch_decomp_wdog_start() +#define arch_decomp_wdog() +#endif + +static void error(char *err); + +static void +arch_decomp_setup(void) +{ + /* we may need to setup the uart(s) here if we are not running + * on an BAST... the BAST will have left the uarts configured + * after calling linux. + */ + + arch_decomp_wdog_start(); +} + + +#endif /* __ASM_ARCH_UNCOMPRESS_H */ |