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authorMichal Simek <monstr@monstr.eu>2011-04-14 11:48:43 +0200
committerMichal Simek <monstr@monstr.eu>2011-07-25 09:25:13 +0200
commit2aa8e37596933a43fc3e46e1e385045635674429 (patch)
tree79cbf1212d42d583a5a5951e28d90e27e94df4e4 /arch/microblaze/kernel/prom.c
parente721a45fbed13a52093d2cc1962dbb8a754462ea (diff)
microblaze: Simplify early console binding from DT
Recognize early Linux console from chosen - linux,stdout-path instead of detecting the first console with appropriate compatible strings. This patch solved the problem on system with multiple consoles. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze/kernel/prom.c')
-rw-r--r--arch/microblaze/kernel/prom.c96
1 files changed, 42 insertions, 54 deletions
diff --git a/arch/microblaze/kernel/prom.c b/arch/microblaze/kernel/prom.c
index b15cc219b1d..18d9371d9b2 100644
--- a/arch/microblaze/kernel/prom.c
+++ b/arch/microblaze/kernel/prom.c
@@ -53,69 +53,57 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
}
#ifdef CONFIG_EARLY_PRINTK
-/* MS this is Microblaze specifig function */
-static int __init early_init_dt_scan_serial(unsigned long node,
- const char *uname, int depth, void *data)
-{
- unsigned long l;
- char *p;
- const __be32 *addr;
-
- pr_debug("search \"serial\", depth: %d, uname: %s\n", depth, uname);
-
-/* find all serial nodes */
- if (strncmp(uname, "serial", 6) != 0)
- return 0;
-
-/* find compatible node with uartlite */
- p = of_get_flat_dt_prop(node, "compatible", &l);
- if ((strncmp(p, "xlnx,xps-uartlite", 17) != 0) &&
- (strncmp(p, "xlnx,opb-uartlite", 17) != 0) &&
- (strncmp(p, "xlnx,axi-uartlite", 17) != 0))
- return 0;
-
- addr = of_get_flat_dt_prop(node, "reg", &l);
- return be32_to_cpup(addr); /* return address */
-}
+char *stdout;
-/* this function is looking for early uartlite console - Microblaze specific */
-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,
+int __init early_init_dt_scan_chosen_serial(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 be32_to_cpu(addr); /* return address */
+ pr_debug("%s: depth: %d, uname: %s\n", __func__, depth, uname);
+
+ if (depth == 1 && (strcmp(uname, "chosen") == 0 ||
+ strcmp(uname, "chosen@0") == 0)) {
+ p = of_get_flat_dt_prop(node, "linux,stdout-path", &l);
+ if (p != NULL && l > 0)
+ stdout = p; /* store pointer to stdout-path */
+ }
+
+ if (stdout && strstr(stdout, uname)) {
+ p = of_get_flat_dt_prop(node, "compatible", &l);
+ pr_debug("Compatible string: %s\n", p);
+
+ if ((strncmp(p, "xlnx,xps-uart16550", 18) == 0) ||
+ (strncmp(p, "xlnx,axi-uart16550", 18) == 0)) {
+ unsigned int addr;
+
+ *(u32 *)data = UART16550;
+
+ addr = *(u32 *)of_get_flat_dt_prop(node, "reg", &l);
+ addr += *(u32 *)of_get_flat_dt_prop(node,
+ "reg-offset", &l);
+ /* clear register offset */
+ return be32_to_cpu(addr) & ~3;
+ }
+ if ((strncmp(p, "xlnx,xps-uartlite", 17) == 0) ||
+ (strncmp(p, "xlnx,opb-uartlite", 17) == 0) ||
+ (strncmp(p, "xlnx,axi-uartlite", 17) == 0)) {
+ unsigned int *addrp;
+
+ *(u32 *)data = UARTLITE;
+
+ addrp = of_get_flat_dt_prop(node, "reg", &l);
+ return be32_to_cpup(addrp); /* return address */
+ }
+ }
+ return 0;
}
-/* this function is looking for early uartlite console - Microblaze specific */
-int __init early_uart16550_console(void)
+/* this function is looking for early console - Microblaze specific */
+int __init of_early_console(void *version)
{
- return of_scan_flat_dt(early_init_dt_scan_serial_full, NULL);
+ return of_scan_flat_dt(early_init_dt_scan_chosen_serial, version);
}
#endif