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authorPhilippe De Muyter <phdm@macqel.be>2010-09-20 07:11:11 -0400
committerGreg Ungerer <gerg@uclinux.org>2010-10-20 20:17:30 -0400
commitea49f8ffae6262e8de9a0d3e9fcdd384156c7e05 (patch)
tree546e2ec64f98b5c39a14b61c9861edcbc70e6e35 /arch/m68knommu/platform/548x
parenta7c681f620e75cb0efbe7da092723a6ecd17bc01 (diff)
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>
Diffstat (limited to 'arch/m68knommu/platform/548x')
-rw-r--r--arch/m68knommu/platform/548x/Makefile18
-rw-r--r--arch/m68knommu/platform/548x/config.c115
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 @@
1#
2# Makefile for the m68knommu linux kernel.
3#
4
5#
6# If you want to play with the HW breakpoints then you will
7# need to add define this, which will give you a stack backtrace
8# on the console port whenever a DBG interrupt occurs. You have to
9# set up you HW breakpoints to trigger a DBG interrupt:
10#
11# EXTRA_CFLAGS += -DTRAP_DBG_INTERRUPT
12# EXTRA_AFLAGS += -DTRAP_DBG_INTERRUPT
13#
14
15asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1
16
17obj-y := config.o
18
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 @@
1/***************************************************************************/
2
3/*
4 * linux/arch/m68knommu/platform/548x/config.c
5 *
6 * Copyright (C) 2010, Philippe De Muyter <phdm@macqel.be>
7 */
8
9/***************************************************************************/
10
11#include <linux/kernel.h>
12#include <linux/param.h>
13#include <linux/init.h>
14#include <linux/interrupt.h>
15#include <linux/io.h>
16#include <asm/machdep.h>
17#include <asm/coldfire.h>
18#include <asm/m548xsim.h>
19#include <asm/mcfuart.h>
20#include <asm/m548xgpt.h>
21
22/***************************************************************************/
23
24static struct mcf_platform_uart m548x_uart_platform[] = {
25 {
26 .mapbase = MCF_MBAR + MCFUART_BASE1,
27 .irq = 64 + 35,
28 },
29 {
30 .mapbase = MCF_MBAR + MCFUART_BASE2,
31 .irq = 64 + 34,
32 },
33 {
34 .mapbase = MCF_MBAR + MCFUART_BASE3,
35 .irq = 64 + 33,
36 },
37 {
38 .mapbase = MCF_MBAR + MCFUART_BASE4,
39 .irq = 64 + 32,
40 },
41};
42
43static struct platform_device m548x_uart = {
44 .name = "mcfuart",
45 .id = 0,
46 .dev.platform_data = m548x_uart_platform,
47};
48
49static struct platform_device *m548x_devices[] __initdata = {
50 &m548x_uart,
51};
52
53
54/***************************************************************************/
55
56static void __init m548x_uart_init_line(int line, int irq)
57{
58 int rts_cts;
59
60 /* enable io pins */
61 switch (line) {
62 case 0:
63 rts_cts = 0; break;
64 case 1:
65 rts_cts = MCF_PAR_PSC_RTS_RTS; break;
66 case 2:
67 rts_cts = MCF_PAR_PSC_RTS_RTS | MCF_PAR_PSC_CTS_CTS; break;
68 case 3:
69 rts_cts = 0; break;
70 }
71 __raw_writeb(MCF_PAR_PSC_TXD | rts_cts | MCF_PAR_PSC_RXD,
72 MCF_MBAR + MCF_PAR_PSC(line));
73}
74
75static void __init m548x_uarts_init(void)
76{
77 const int nrlines = ARRAY_SIZE(m548x_uart_platform);
78 int line;
79
80 for (line = 0; (line < nrlines); line++)
81 m548x_uart_init_line(line, m548x_uart_platform[line].irq);
82}
83
84/***************************************************************************/
85
86static void mcf548x_reset(void)
87{
88 /* disable interrupts and enable the watchdog */
89 asm("movew #0x2700, %sr\n");
90 __raw_writel(0, MCF_MBAR + MCF_GPT_GMS0);
91 __raw_writel(MCF_GPT_GCIR_CNT(1), MCF_MBAR + MCF_GPT_GCIR0);
92 __raw_writel(MCF_GPT_GMS_WDEN | MCF_GPT_GMS_CE | MCF_GPT_GMS_TMS(4),
93 MCF_MBAR + MCF_GPT_GMS0);
94}
95
96/***************************************************************************/
97
98void __init config_BSP(char *commandp, int size)
99{
100 mach_reset = mcf548x_reset;
101 m548x_uarts_init();
102}
103
104/***************************************************************************/
105
106static int __init init_BSP(void)
107{
108
109 platform_add_devices(m548x_devices, ARRAY_SIZE(m548x_devices));
110 return 0;
111}
112
113arch_initcall(init_BSP);
114
115/***************************************************************************/