powerpc: Add early debug for WSP platforms
Signed-off-by: Jack Miller <jack@codezen.org>
Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/udbg_16550.c b/arch/powerpc/kernel/udbg_16550.c
index baa33a7..6837f83 100644
--- a/arch/powerpc/kernel/udbg_16550.c
+++ b/arch/powerpc/kernel/udbg_16550.c
@@ -11,6 +11,7 @@
#include <linux/types.h>
#include <asm/udbg.h>
#include <asm/io.h>
+#include <asm/reg_a2.h>
extern u8 real_readb(volatile u8 __iomem *addr);
extern void real_writeb(u8 data, volatile u8 __iomem *addr);
@@ -298,3 +299,53 @@
udbg_getc_poll = NULL;
}
#endif /* CONFIG_PPC_EARLY_DEBUG_40x */
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_WSP
+static void udbg_wsp_flush(void)
+{
+ if (udbg_comport) {
+ while ((readb(&udbg_comport->lsr) & LSR_THRE) == 0)
+ /* wait for idle */;
+ }
+}
+
+static void udbg_wsp_putc(char c)
+{
+ if (udbg_comport) {
+ if (c == '\n')
+ udbg_wsp_putc('\r');
+ udbg_wsp_flush();
+ writeb(c, &udbg_comport->thr); eieio();
+ }
+}
+
+static int udbg_wsp_getc(void)
+{
+ if (udbg_comport) {
+ while ((readb(&udbg_comport->lsr) & LSR_DR) == 0)
+ ; /* wait for char */
+ return readb(&udbg_comport->rbr);
+ }
+ return -1;
+}
+
+static int udbg_wsp_getc_poll(void)
+{
+ if (udbg_comport)
+ if (readb(&udbg_comport->lsr) & LSR_DR)
+ return readb(&udbg_comport->rbr);
+ return -1;
+}
+
+void __init udbg_init_wsp(void)
+{
+ udbg_comport = (struct NS16550 __iomem *)WSP_UART_VIRT;
+
+ udbg_init_uart(udbg_comport, 57600, 50000000);
+
+ udbg_putc = udbg_wsp_putc;
+ udbg_flush = udbg_wsp_flush;
+ udbg_getc = udbg_wsp_getc;
+ udbg_getc_poll = udbg_wsp_getc_poll;
+}
+#endif /* CONFIG_PPC_EARLY_DEBUG_WSP */