[POWERPC] pasemi: UART udbg support

Early debug output for PA Semi UART. Uses the 2.05 CI real mode ops.

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c
index 2d17f2b8eda7..e738f93b42fe 100644
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -14,6 +14,8 @@
 
 extern u8 real_readb(volatile u8 __iomem  *addr);
 extern void real_writeb(u8 data, volatile u8 __iomem *addr);
+extern u8 real_205_readb(volatile u8 __iomem  *addr);
+extern void real_205_writeb(u8 data, volatile u8 __iomem *addr);
 
 struct NS16550 {
         /* this struct must be packed */
@@ -167,3 +169,25 @@ void __init udbg_init_maple_realmode(void)
         udbg_getc_poll = NULL;
 }
 #endif /* CONFIG_PPC_MAPLE */
+
+#ifdef CONFIG_PPC_PASEMI
+void udbg_pas_real_putc(char c)
+{
+        if (udbg_comport) {
+                while ((real_205_readb(&udbg_comport->lsr) & LSR_THRE) == 0)
+                        /* wait for idle */;
+                real_205_writeb(c, &udbg_comport->thr); eieio();
+                if (c == '\n')
+                        udbg_pas_real_putc('\r');
+        }
+}
+
+void udbg_init_pas_realmode(void)
+{
+        udbg_comport = (volatile struct NS16550 __iomem *)0xfcff03f8;
+
+        udbg_putc = udbg_pas_real_putc;
+        udbg_getc = NULL;
+        udbg_getc_poll = NULL;
+}
+#endif /* CONFIG_PPC_MAPLE */