m68knommu: add basic mmu-less m548x support

Add a very basic mmu-less support for coldfire m548x family.  This is perhaps
also valid for m547x family.  The port comprises the serial, tick timer and
reboot support.  The gpio part compiles but is empty.  This gives a functional
albeit limited linux for the m548x coldfire family.  This has been tested
on a Freescale M548xEVB Lite board with a M5484 processor and the default
dbug monitor.

Signed-off-by: Philippe De Muyter <phdm@macqel.be>
Signed-off-by: Greg Ungerer <gerg@uclinux.org>

2 files changed, 133 insertions, 0 deletions

diff --git a/arch/m68knommu/platform/548x/Makefile b/arch/m68knommu/platform/548x/Makefile
new file mode 100644
index 000000000000..e6035e7a2d3f
--- /dev/null
+++ b/arch/m68knommu/platform/548x/Makefile
@@ -0,0 +1,18 @@
+#
+# Makefile for the m68knommu linux kernel.
+#
+
+#
+# If you want to play with the HW breakpoints then you will
+# need to add define this,  which will give you a stack backtrace
+# on the console port whenever a DBG interrupt occurs. You have to
+# set up you HW breakpoints to trigger a DBG interrupt:
+#
+# EXTRA_CFLAGS += -DTRAP_DBG_INTERRUPT
+# EXTRA_AFLAGS += -DTRAP_DBG_INTERRUPT
+#
+
+asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
+
+obj-y := config.o
+
diff --git a/arch/m68knommu/platform/548x/config.c b/arch/m68knommu/platform/548x/config.c
new file mode 100644
index 000000000000..9888846bd1cf
--- /dev/null
+++ b/arch/m68knommu/platform/548x/config.c
@@ -0,0 +1,115 @@
+/***************************************************************************/
+
+/*
+ *      linux/arch/m68knommu/platform/548x/config.c
+ *
+ *      Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
+ */
+
+/***************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <asm/machdep.h>
+#include <asm/coldfire.h>
+#include <asm/m548xsim.h>
+#include <asm/mcfuart.h>
+#include <asm/m548xgpt.h>
+
+/***************************************************************************/
+
+static struct mcf_platform_uart m548x_uart_platform[] = {
+        {
+                .mapbase        = MCF_MBAR + MCFUART_BASE1,
+                .irq            = 64 + 35,
+        },
+        {
+                .mapbase        = MCF_MBAR + MCFUART_BASE2,
+                .irq            = 64 + 34,
+        },
+        {
+                .mapbase        = MCF_MBAR + MCFUART_BASE3,
+                .irq            = 64 + 33,
+        },
+        {
+                .mapbase        = MCF_MBAR + MCFUART_BASE4,
+                .irq            = 64 + 32,
+        },
+};
+
+static struct platform_device m548x_uart = {
+        .name                   = "mcfuart",
+        .id                     = 0,
+        .dev.platform_data      = m548x_uart_platform,
+};
+
+static struct platform_device *m548x_devices[] __initdata = {
+        &m548x_uart,
+};
+
+
+/***************************************************************************/
+
+static void __init m548x_uart_init_line(int line, int irq)
+{
+        int rts_cts;
+
+        /* enable io pins */
+        switch (line) {
+        case 0:
+                rts_cts = 0; break;
+        case 1:
+                rts_cts = MCF_PAR_PSC_RTS_RTS; break;
+        case 2:
+                rts_cts = MCF_PAR_PSC_RTS_RTS | MCF_PAR_PSC_CTS_CTS; break;
+        case 3:
+                rts_cts = 0; break;
+        }
+        __raw_writeb(MCF_PAR_PSC_TXD | rts_cts | MCF_PAR_PSC_RXD,
+                                                MCF_MBAR + MCF_PAR_PSC(line));
+}
+
+static void __init m548x_uarts_init(void)
+{
+        const int nrlines = ARRAY_SIZE(m548x_uart_platform);
+        int line;
+
+        for (line = 0; (line < nrlines); line++)
+                m548x_uart_init_line(line, m548x_uart_platform[line].irq);
+}
+
+/***************************************************************************/
+
+static void mcf548x_reset(void)
+{
+        /* disable interrupts and enable the watchdog */
+        asm("movew #0x2700, %sr\n");
+        __raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
+        __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
+        __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
+                                                MCF_MBAR + MCF_GPT_GMS0);
+}
+
+/***************************************************************************/
+
+void __init config_BSP(char *commandp, int size)
+{
+        mach_reset = mcf548x_reset;
+        m548x_uarts_init();
+}
+
+/***************************************************************************/
+
+static int __init init_BSP(void)
+{
+
+        platform_add_devices(m548x_devices, ARRAY_SIZE(m548x_devices));
+        return 0;
+}
+
+arch_initcall(init_BSP);
+
+/***************************************************************************/