| /* arch/arm/plat-samsung/include/plat/uncompress.h |
| * |
| * Copyright 2003, 2007 Simtec Electronics |
| * http://armlinux.simtec.co.uk/ |
| * Ben Dooks <ben@simtec.co.uk> |
| * |
| * S3C - 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. |
| */ |
| |
| #ifndef __ASM_PLAT_UNCOMPRESS_H |
| #define __ASM_PLAT_UNCOMPRESS_H |
| |
| typedef unsigned int upf_t; /* cannot include linux/serial_core.h */ |
| |
| /* uart setup */ |
| |
| unsigned int fifo_mask; |
| unsigned int fifo_max; |
| |
| volatile u8 *uart_base; |
| |
| /* forward declerations */ |
| |
| static void arch_detect_cpu(void); |
| |
| /* defines for UART registers */ |
| |
| #include <plat/regs-serial.h> |
| |
| /* working in physical space... */ |
| #define S3C_WDOGREG(x) ((S3C_PA_WDT + (x))) |
| |
| #define S3C2410_WTCON S3C_WDOGREG(0x00) |
| #define S3C2410_WTDAT S3C_WDOGREG(0x04) |
| #define S3C2410_WTCNT S3C_WDOGREG(0x08) |
| |
| #define S3C2410_WTCON_RSTEN (1 << 0) |
| #define S3C2410_WTCON_ENABLE (1 << 5) |
| |
| #define S3C2410_WTCON_DIV128 (3 << 3) |
| |
| #define S3C2410_WTCON_PRESCALE(x) ((x) << 8) |
| |
| /* how many bytes we allow into the FIFO at a time in FIFO mode */ |
| #define FIFO_MAX (14) |
| |
| 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(int ch) |
| { |
| if (!config_enabled(CONFIG_DEBUG_LL)) |
| return; |
| |
| if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) { |
| int level; |
| |
| while (1) { |
| level = uart_rd(S3C2410_UFSTAT); |
| level &= fifo_mask; |
| |
| if (level < fifo_max) |
| break; |
| } |
| |
| } else { |
| /* not using fifos */ |
| |
| while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE) |
| barrier(); |
| } |
| |
| /* write byte to transmission register */ |
| uart_wr(S3C2410_UTXH, ch); |
| } |
| |
| static inline void flush(void) |
| { |
| } |
| |
| #define __raw_writel(d, ad) \ |
| do { \ |
| *((volatile unsigned int __force *)(ad)) = (d); \ |
| } while (0) |
| |
| #ifdef CONFIG_S3C_BOOT_ERROR_RESET |
| |
| static void arch_decomp_error(const char *x) |
| { |
| putstr("\n\n"); |
| putstr(x); |
| putstr("\n\n -- System resetting\n"); |
| |
| __raw_writel(0x4000, S3C2410_WTDAT); |
| __raw_writel(0x4000, S3C2410_WTCNT); |
| __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON); |
| |
| while(1); |
| } |
| |
| #define arch_error arch_decomp_error |
| #endif |
| |
| #ifdef CONFIG_S3C_BOOT_UART_FORCE_FIFO |
| static inline void arch_enable_uart_fifo(void) |
| { |
| u32 fifocon; |
| |
| if (!config_enabled(CONFIG_DEBUG_LL)) |
| return; |
| |
| fifocon = uart_rd(S3C2410_UFCON); |
| |
| if (!(fifocon & S3C2410_UFCON_FIFOMODE)) { |
| fifocon |= S3C2410_UFCON_RESETBOTH; |
| uart_wr(S3C2410_UFCON, fifocon); |
| |
| /* wait for fifo reset to complete */ |
| while (1) { |
| fifocon = uart_rd(S3C2410_UFCON); |
| if (!(fifocon & S3C2410_UFCON_RESETBOTH)) |
| break; |
| } |
| |
| uart_wr(S3C2410_UFCON, S3C2410_UFCON_FIFOMODE); |
| } |
| } |
| #else |
| #define arch_enable_uart_fifo() do { } while(0) |
| #endif |
| |
| |
| 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_detect_cpu(); |
| |
| /* Enable the UART FIFOs if they where not enabled and our |
| * configuration says we should turn them on. |
| */ |
| |
| arch_enable_uart_fifo(); |
| } |
| |
| |
| #endif /* __ASM_PLAT_UNCOMPRESS_H */ |