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[ARM] S3C: Add UART FIFO selection during arch decompression 

Add a configuration option to start the UART FIFOs during the
decompressions sequence to improve boot time when the bootloader
fails to enable the UART FIFOs.

For example, the SMDK6410 UBoot 1.1.6 leaves the FIFOs off.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
This commit is contained in:
Ben Dooks 2008-12-02 19:34:52 +00:00
parent 7d2dbcf9fa
commit e7aa6f46f6
2 changed files with 36 additions and 0 deletions
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8
arch/arm/plat-s3c/Kconfig
View File

@ -57,6 +57,14 @@ config S3C_BOOT_ERROR_RESET
Say y here to use the watchdog to reset the system if the
kernel decompressor detects an error during decompression.
config S3C_BOOT_UART_FORCE_FIFO
bool "Force UART FIFO on during boot process"
depends on PLAT_S3C
default y
help
Say Y here to force the UART FIFOs on during the kernel
uncompressor
comment "Power management"
config S3C2410_PM_DEBUG

28
arch/arm/plat-s3c/include/plat/uncompress.h
View File

@ -139,6 +139,28 @@ static void arch_decomp_error(const char *x)
static void error(char *err);
#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)
{
@ -149,6 +171,12 @@ arch_decomp_setup(void)
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();
}