MIPS: Loongson1B: Improve early printk
- Determine serial port for early printk according to kernel command line. - Move to 8250/16550 serial early printk driver. Signed-off-by: Kelvin Cheung <keguang.zhang@gmail.com> Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/8023/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Родитель
a13f079575
Коммит
813c14108d
|
@ -16,6 +16,7 @@ config LOONGSON1_LS1B
|
|||
select SYS_SUPPORTS_HIGHMEM
|
||||
select SYS_SUPPORTS_MIPS16
|
||||
select SYS_HAS_EARLY_PRINTK
|
||||
select USE_GENERIC_EARLY_PRINTK_8250
|
||||
select COMMON_CLK
|
||||
|
||||
endchoice
|
||||
|
|
|
@ -27,7 +27,7 @@ char *prom_getenv(char *envname)
|
|||
i = strlen(envname);
|
||||
|
||||
while (*env) {
|
||||
if (strncmp(envname, *env, i) == 0 && *(*env+i) == '=')
|
||||
if (strncmp(envname, *env, i) == 0 && *(*env + i) == '=')
|
||||
return *env + i + 1;
|
||||
env++;
|
||||
}
|
||||
|
@ -49,7 +49,7 @@ void __init prom_init_cmdline(void)
|
|||
for (i = 1; i < prom_argc; i++) {
|
||||
strcpy(c, prom_argv[i]);
|
||||
c += strlen(prom_argv[i]);
|
||||
if (i < prom_argc-1)
|
||||
if (i < prom_argc - 1)
|
||||
*c++ = ' ';
|
||||
}
|
||||
*c = 0;
|
||||
|
@ -57,6 +57,7 @@ void __init prom_init_cmdline(void)
|
|||
|
||||
void __init prom_init(void)
|
||||
{
|
||||
void __iomem *uart_base;
|
||||
prom_argc = fw_arg0;
|
||||
prom_argv = (char **)fw_arg1;
|
||||
prom_envp = (char **)fw_arg2;
|
||||
|
@ -65,23 +66,18 @@ void __init prom_init(void)
|
|||
|
||||
memsize = env_or_default("memsize", DEFAULT_MEMSIZE);
|
||||
highmemsize = env_or_default("highmemsize", 0x0);
|
||||
|
||||
if (strstr(arcs_cmdline, "console=ttyS3"))
|
||||
uart_base = ioremap_nocache(LS1X_UART3_BASE, 0x0f);
|
||||
else if (strstr(arcs_cmdline, "console=ttyS2"))
|
||||
uart_base = ioremap_nocache(LS1X_UART2_BASE, 0x0f);
|
||||
else if (strstr(arcs_cmdline, "console=ttyS1"))
|
||||
uart_base = ioremap_nocache(LS1X_UART1_BASE, 0x0f);
|
||||
else
|
||||
uart_base = ioremap_nocache(LS1X_UART0_BASE, 0x0f);
|
||||
setup_8250_early_printk_port((unsigned long)uart_base, 0, 0);
|
||||
}
|
||||
|
||||
void __init prom_free_prom_memory(void)
|
||||
{
|
||||
}
|
||||
|
||||
#define PORT(offset) (u8 *)(KSEG1ADDR(LS1X_UART0_BASE + offset))
|
||||
|
||||
void prom_putchar(char c)
|
||||
{
|
||||
int timeout;
|
||||
|
||||
timeout = 1024;
|
||||
|
||||
while (((readb(PORT(UART_LSR)) & UART_LSR_THRE) == 0)
|
||||
&& (timeout-- > 0))
|
||||
;
|
||||
|
||||
writeb(c, PORT(UART_TX));
|
||||
}
|
||||
|
|
Загрузка…
Ссылка в новой задаче