ARM: mxs: Add low-level debug UART support

 - DEBUG_LL support, which is incompatible with multi-soc MXS image
   because of different DUART base address on MX23 and MX28
 - uncompress message support

Signed-off-by: Shawn Guo <shawn.guo@freescale.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

1 files changed, 76 insertions, 0 deletions

diff --git a/arch/arm/mach-mxs/include/mach/uncompress.h b/arch/arm/mach-mxs/include/mach/uncompress.h
new file mode 100644
index 0000000..a005e76f
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/uncompress.h
@@ -0,0 +1,76 @@
+/*
+ *  arch/arm/mach-mxs/include/mach/uncompress.h
+ *
+ *  Copyright (C) 1999 ARM Limited
+ *  Copyright (C) Shane Nay (shane@minirl.com)
+ *  Copyright 2010 Freescale Semiconductor, Inc. All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+#ifndef __MACH_MXS_UNCOMPRESS_H__
+#define __MACH_MXS_UNCOMPRESS_H__
+
+#include <asm/mach-types.h>
+
+static unsigned long mxs_duart_base;
+
+#define MXS_DUART(x)	(*(volatile unsigned long *)(mxs_duart_base + (x)))
+
+#define MXS_DUART_DR		0x00
+#define MXS_DUART_FR		0x18
+#define MXS_DUART_FR_TXFE	(1 << 7)
+#define MXS_DUART_CR		0x30
+#define MXS_DUART_CR_UARTEN	(1 << 0)
+
+/*
+ * The following code assumes the serial port has already been
+ * initialized by the bootloader. If it's not, the output is
+ * simply discarded.
+ */
+
+static void putc(int ch)
+{
+	if (!mxs_duart_base)
+		return;
+	if (!(MXS_DUART(MXS_DUART_CR) & MXS_DUART_CR_UARTEN))
+		return;
+
+	while (!(MXS_DUART(MXS_DUART_FR) & MXS_DUART_FR_TXFE))
+		barrier();
+
+	MXS_DUART(MXS_DUART_DR) = ch;
+}
+
+static inline void flush(void)
+{
+}
+
+#define MX23_DUART_BASE_ADDR	0x80070000
+#define MX28_DUART_BASE_ADDR	0x80074000
+
+static inline void __arch_decomp_setup(unsigned long arch_id)
+{
+	switch (arch_id) {
+	case MACH_TYPE_MX23EVK:
+		mxs_duart_base = MX23_DUART_BASE_ADDR;
+		break;
+	case MACH_TYPE_MX28EVK:
+		mxs_duart_base = MX28_DUART_BASE_ADDR;
+		break;
+	default:
+		break;
+	}
+}
+
+#define arch_decomp_setup()	__arch_decomp_setup(arch_id)
+#define arch_decomp_wdog()
+
+#endif /* __MACH_MXS_UNCOMPRESS_H__ */