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>

2 files changed, 114 insertions, 0 deletions

diff --git a/arch/arm/mach-mxs/include/mach/debug-macro.S b/arch/arm/mach-mxs/include/mach/debug-macro.S
new file mode 100644
index 000000000000..79650a1ad78d
--- /dev/null
+++ b/arch/arm/mach-mxs/include/mach/debug-macro.S
@@ -0,0 +1,38 @@
+/* arch/arm/mach-mxs/include/mach/debug-macro.S
+ *
+ * Debugging macro include header
+ *
+ *  Copyright (C) 1994-1999 Russell King
+ *  Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <mach/mx23.h>
+#include <mach/mx28.h>
+
+#ifdef CONFIG_SOC_IMX23
+#ifdef UART_PADDR
+#error "CONFIG_DEBUG_LL is incompatible with multiple archs"
+#endif
+#define UART_PADDR      MX23_DUART_BASE_ADDR
+#endif
+
+#ifdef CONFIG_SOC_IMX28
+#ifdef UART_PADDR
+#error "CONFIG_DEBUG_LL is incompatible with multiple archs"
+#endif
+#define UART_PADDR      MX28_DUART_BASE_ADDR
+#endif
+
+#define UART_VADDR      MXS_IO_ADDRESS(UART_PADDR)
+
+                .macro  addruart, rp, rv
+                ldr     \rp, =UART_PADDR        @ physical
+                ldr     \rv, =UART_VADDR        @ virtual
+                .endm
+
+#include <asm/hardware/debug-pl01x.S>
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 000000000000..a005e76f34f9
--- /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__ */