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microblaze: Support early console on uart16550

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Early console support reuse setting from U-BOOT that's why
it is not necessary to setup baudrates, etc.

Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
Michal Simek
2010-09-28 16:17:03 +10:00
parent 51f5fa5094
commit 67f4aaa21c
4 changed files with 99 additions and 1 deletions
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34
arch/microblaze/kernel/prom.c
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@@ -89,6 +89,40 @@ int __init early_uartlite_console(void)
{
return of_scan_flat_dt(early_init_dt_scan_serial, NULL);
}
/* MS this is Microblaze specifig function */
static int __init early_init_dt_scan_serial_full(unsigned long node,
const char *uname, int depth, void *data)
{
unsigned long l;
char *p;
unsigned int addr;
pr_debug("search \"chosen\", depth: %d, uname: %s\n", depth, uname);
/* find all serial nodes */
if (strncmp(uname, "serial", 6) != 0)
return 0;
early_init_dt_check_for_initrd(node);
/* find compatible node with uartlite */
p = of_get_flat_dt_prop(node, "compatible", &l);
if ((strncmp(p, "xlnx,xps-uart16550", 18) != 0) &&
(strncmp(p, "xlnx,axi-uart16550", 18) != 0))
return 0;
addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
addr += *(u32 *)of_get_flat_dt_prop(node, "reg-offset", &l);
return addr; /* return address */
}
/* this function is looking for early uartlite console - Microblaze specific */
int __init early_uart16550_console(void)
{
return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
}
#endif
void __init early_init_devtree(void *params)