mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-20 09:34:44 +08:00
171c067c1a
Actually, the base address of uart is different between EXYNOS4 and EXYNOS5 and this patch enables to support uart for EXYNOS4 and EXYNOS5 SoCs at runtime. Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
187 lines
3.9 KiB
C
187 lines
3.9 KiB
C
/* 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;
|
|
|
|
/* forward declerations */
|
|
|
|
static void arch_detect_cpu(void);
|
|
|
|
/* defines for UART registers */
|
|
|
|
#include <plat/regs-serial.h>
|
|
#include <plat/regs-watchdog.h>
|
|
|
|
/* working in physical space... */
|
|
#undef S3C2410_WDOGREG
|
|
#define S3C2410_WDOGREG(x) ((S3C24XX_PA_WATCHDOG + (x)))
|
|
|
|
/* how many bytes we allow into the FIFO at a time in FIFO mode */
|
|
#define FIFO_MAX (14)
|
|
|
|
#ifdef S3C_PA_UART
|
|
#define uart_base S3C_PA_UART + (S3C_UART_OFFSET * CONFIG_S3C_LOWLEVEL_UART_PORT)
|
|
#endif
|
|
|
|
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 (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)
|
|
|
|
/* CONFIG_S3C_BOOT_WATCHDOG
|
|
*
|
|
* Simple boot-time watchdog setup, to reboot the system if there is
|
|
* any problem with the boot process
|
|
*/
|
|
|
|
#ifdef CONFIG_S3C_BOOT_WATCHDOG
|
|
|
|
#define WDOG_COUNT (0xff00)
|
|
|
|
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(0x80), S3C2410_WTCON);
|
|
}
|
|
|
|
#else
|
|
#define arch_decomp_wdog_start()
|
|
#define arch_decomp_wdog()
|
|
#endif
|
|
|
|
#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 = 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;
|
|
}
|
|
}
|
|
}
|
|
#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();
|
|
arch_decomp_wdog_start();
|
|
|
|
/* 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 */
|