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authorScott Wood <scottwood@freescale.com>2007-07-16 11:43:43 -0500
committerKumar Gala <galak@kernel.crashing.org>2007-10-03 20:35:43 -0500
commitc374e00e17f1c10768d5af922a1ff33e43df2eb0 (patch)
treefc6149e7f3b86bb202c475d4414a926c481761b8 /arch/powerpc/sysdev/cpm_common.c
parente631ae3b164158fbf486fbed5adb597696c4f0e5 (diff)
[POWERPC] Add early debug console for CPM serial ports.
This code assumes that the ports have been previously set up, with buffers in DPRAM. Signed-off-by: Scott Wood <scottwood@freescale.com> Acked-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/sysdev/cpm_common.c')
-rw-r--r--arch/powerpc/sysdev/cpm_common.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c
new file mode 100644
index 00000000000..9daa6ac6767
--- /dev/null
+++ b/arch/powerpc/sysdev/cpm_common.c
@@ -0,0 +1,46 @@
+/*
+ * Common CPM code
+ *
+ * Author: Scott Wood <scottwood@freescale.com>
+ *
+ * Copyright 2007 Freescale Semiconductor, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/init.h>
+#include <asm/udbg.h>
+#include <asm/io.h>
+#include <asm/system.h>
+#include <mm/mmu_decl.h>
+
+#ifdef CONFIG_PPC_EARLY_DEBUG_CPM
+static u32 __iomem *cpm_udbg_txdesc =
+ (u32 __iomem __force *)CONFIG_PPC_EARLY_DEBUG_CPM_ADDR;
+
+static void udbg_putc_cpm(char c)
+{
+ u8 __iomem *txbuf = (u8 __iomem __force *)in_be32(&cpm_udbg_txdesc[1]);
+
+ if (c == '\n')
+ udbg_putc('\r');
+
+ while (in_be32(&cpm_udbg_txdesc[0]) & 0x80000000)
+ ;
+
+ out_8(txbuf, c);
+ out_be32(&cpm_udbg_txdesc[0], 0xa0000001);
+}
+
+void __init udbg_init_cpm(void)
+{
+ if (cpm_udbg_txdesc) {
+#ifdef CONFIG_CPM2
+ setbat(1, 0xf0000000, 0xf0000000, 1024*1024, _PAGE_IO);
+#endif
+ udbg_putc = udbg_putc_cpm;
+ }
+}
+#endif