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authorPhilippe De Muyter <phdm@macqel.be>2010-09-20 13:11:11 +0200
committerGreg Ungerer <gerg@uclinux.org>2010-10-21 10:17:30 +1000
commitea49f8ffae6262e8de9a0d3e9fcdd384156c7e05 (patch)
tree546e2ec64f98b5c39a14b61c9861edcbc70e6e35 /arch/m68knommu
parenta7c681f620e75cb0efbe7da092723a6ecd17bc01 (diff)
downloadblackbird-op-linux-ea49f8ffae6262e8de9a0d3e9fcdd384156c7e05.tar.gz
blackbird-op-linux-ea49f8ffae6262e8de9a0d3e9fcdd384156c7e05.zip
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')
-rw-r--r--arch/m68knommu/Kconfig7
-rw-r--r--arch/m68knommu/Makefile3
-rw-r--r--arch/m68knommu/platform/548x/Makefile18
-rw-r--r--arch/m68knommu/platform/548x/config.c115
-rw-r--r--arch/m68knommu/platform/coldfire/Makefile1
-rw-r--r--arch/m68knommu/platform/coldfire/sltimers.c145
6 files changed, 288 insertions, 1 deletions
diff --git a/arch/m68knommu/Kconfig b/arch/m68knommu/Kconfig
index fd28178b5877..9287150e5fb0 100644
--- a/arch/m68knommu/Kconfig
+++ b/arch/m68knommu/Kconfig
@@ -175,6 +175,11 @@ config M5407
help
Motorola ColdFire 5407 processor support.
+config M548x
+ bool "MCF548x"
+ help
+ Freescale ColdFire 5480/5481/5482/5483/5484/5485 processor support.
+
endchoice
config M527x
@@ -185,7 +190,7 @@ config M527x
config COLDFIRE
bool
- depends on (M5206 || M5206e || M520x || M523x || M5249 || M527x || M5272 || M528x || M5307 || M532x || M5407)
+ depends on (M5206 || M5206e || M520x || M523x || M5249 || M527x || M5272 || M528x || M5307 || M532x || M5407 || M548x)
select GENERIC_GPIO
select ARCH_REQUIRE_GPIOLIB
default y
diff --git a/arch/m68knommu/Makefile b/arch/m68knommu/Makefile
index 14042574ac21..026ef16fa68e 100644
--- a/arch/m68knommu/Makefile
+++ b/arch/m68knommu/Makefile
@@ -25,6 +25,7 @@ platform-$(CONFIG_M528x) := 528x
platform-$(CONFIG_M5307) := 5307
platform-$(CONFIG_M532x) := 532x
platform-$(CONFIG_M5407) := 5407
+platform-$(CONFIG_M548x) := 548x
PLATFORM := $(platform-y)
board-$(CONFIG_PILOT) := pilot
@@ -73,6 +74,7 @@ cpuclass-$(CONFIG_M528x) := coldfire
cpuclass-$(CONFIG_M5307) := coldfire
cpuclass-$(CONFIG_M532x) := coldfire
cpuclass-$(CONFIG_M5407) := coldfire
+cpuclass-$(CONFIG_M548x) := coldfire
cpuclass-$(CONFIG_M68328) := 68328
cpuclass-$(CONFIG_M68EZ328) := 68328
cpuclass-$(CONFIG_M68VZ328) := 68328
@@ -100,6 +102,7 @@ cflags-$(CONFIG_M528x) := $(call cc-option,-m528x,-m5307)
cflags-$(CONFIG_M5307) := $(call cc-option,-m5307,-m5200)
cflags-$(CONFIG_M532x) := $(call cc-option,-mcpu=532x,-m5307)
cflags-$(CONFIG_M5407) := $(call cc-option,-m5407,-m5200)
+cflags-$(CONFIG_M548x) := $(call cc-option,-m5407,-m5200)
cflags-$(CONFIG_M68328) := -m68000
cflags-$(CONFIG_M68EZ328) := -m68000
cflags-$(CONFIG_M68VZ328) := -m68000
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);
+
+/***************************************************************************/
diff --git a/arch/m68knommu/platform/coldfire/Makefile b/arch/m68knommu/platform/coldfire/Makefile
index f72a0e5d9996..df62171d986c 100644
--- a/arch/m68knommu/platform/coldfire/Makefile
+++ b/arch/m68knommu/platform/coldfire/Makefile
@@ -26,6 +26,7 @@ obj-$(CONFIG_M528x) += pit.o intc-2.o
obj-$(CONFIG_M5307) += timers.o intc.o
obj-$(CONFIG_M532x) += timers.o intc-simr.o
obj-$(CONFIG_M5407) += timers.o intc.o
+obj-$(CONFIG_M548x) += sltimers.o intc-2.o
obj-y += pinmux.o gpio.o
extra-y := head.o
diff --git a/arch/m68knommu/platform/coldfire/sltimers.c b/arch/m68knommu/platform/coldfire/sltimers.c
new file mode 100644
index 000000000000..0a1b937c3e18
--- /dev/null
+++ b/arch/m68knommu/platform/coldfire/sltimers.c
@@ -0,0 +1,145 @@
+/***************************************************************************/
+
+/*
+ * sltimers.c -- generic ColdFire slice timer support.
+ *
+ * Copyright (C) 2009-2010, Philippe De Muyter <phdm@macqel.be>
+ * based on
+ * timers.c -- generic ColdFire hardware timer support.
+ * Copyright (C) 1999-2008, Greg Ungerer <gerg@snapgear.com>
+ */
+
+/***************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/profile.h>
+#include <linux/clocksource.h>
+#include <asm/io.h>
+#include <asm/traps.h>
+#include <asm/machdep.h>
+#include <asm/coldfire.h>
+#include <asm/mcfslt.h>
+#include <asm/mcfsim.h>
+
+/***************************************************************************/
+
+#ifdef CONFIG_HIGHPROFILE
+
+/*
+ * By default use Slice Timer 1 as the profiler clock timer.
+ */
+#define PA(a) (MCF_MBAR + MCFSLT_TIMER1 + (a))
+
+/*
+ * Choose a reasonably fast profile timer. Make it an odd value to
+ * try and get good coverage of kernel operations.
+ */
+#define PROFILEHZ 1013
+
+irqreturn_t mcfslt_profile_tick(int irq, void *dummy)
+{
+ /* Reset Slice Timer 1 */
+ __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, PA(MCFSLT_SSR));
+ if (current->pid)
+ profile_tick(CPU_PROFILING);
+ return IRQ_HANDLED;
+}
+
+static struct irqaction mcfslt_profile_irq = {
+ .name = "profile timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER,
+ .handler = mcfslt_profile_tick,
+};
+
+void mcfslt_profile_init(void)
+{
+ printk(KERN_INFO "PROFILE: lodging TIMER 1 @ %dHz as profile timer\n",
+ PROFILEHZ);
+
+ setup_irq(MCF_IRQ_PROFILER, &mcfslt_profile_irq);
+
+ /* Set up TIMER 2 as high speed profile clock */
+ __raw_writel(MCF_BUSCLK / PROFILEHZ - 1, PA(MCFSLT_STCNT));
+ __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN,
+ PA(MCFSLT_SCR));
+
+}
+
+#endif /* CONFIG_HIGHPROFILE */
+
+/***************************************************************************/
+
+/*
+ * By default use Slice Timer 0 as the system clock timer.
+ */
+#define TA(a) (MCF_MBAR + MCFSLT_TIMER0 + (a))
+
+static u32 mcfslt_cycles_per_jiffy;
+static u32 mcfslt_cnt;
+
+static irqreturn_t mcfslt_tick(int irq, void *dummy)
+{
+ /* Reset Slice Timer 0 */
+ __raw_writel(MCFSLT_SSR_BE | MCFSLT_SSR_TE, TA(MCFSLT_SSR));
+ mcfslt_cnt += mcfslt_cycles_per_jiffy;
+ return arch_timer_interrupt(irq, dummy);
+}
+
+static struct irqaction mcfslt_timer_irq = {
+ .name = "timer",
+ .flags = IRQF_DISABLED | IRQF_TIMER,
+ .handler = mcfslt_tick,
+};
+
+static cycle_t mcfslt_read_clk(struct clocksource *cs)
+{
+ unsigned long flags;
+ u32 cycles;
+ u16 scnt;
+
+ local_irq_save(flags);
+ scnt = __raw_readl(TA(MCFSLT_SCNT));
+ cycles = mcfslt_cnt;
+ local_irq_restore(flags);
+
+ /* substract because slice timers count down */
+ return cycles - scnt;
+}
+
+static struct clocksource mcfslt_clk = {
+ .name = "slt",
+ .rating = 250,
+ .read = mcfslt_read_clk,
+ .shift = 20,
+ .mask = CLOCKSOURCE_MASK(32),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+void hw_timer_init(void)
+{
+ mcfslt_cycles_per_jiffy = MCF_BUSCLK / HZ;
+ /*
+ * The coldfire slice timer (SLT) runs from STCNT to 0 included,
+ * then STCNT again and so on. It counts thus actually
+ * STCNT + 1 steps for 1 tick, not STCNT. So if you want
+ * n cycles, initialize STCNT with n - 1.
+ */
+ __raw_writel(mcfslt_cycles_per_jiffy - 1, TA(MCFSLT_STCNT));
+ __raw_writel(MCFSLT_SCR_RUN | MCFSLT_SCR_IEN | MCFSLT_SCR_TEN,
+ TA(MCFSLT_SCR));
+ /* initialize mcfslt_cnt knowing that slice timers count down */
+ mcfslt_cnt = mcfslt_cycles_per_jiffy;
+
+ setup_irq(MCF_IRQ_TIMER, &mcfslt_timer_irq);
+
+ mcfslt_clk.mult = clocksource_hz2mult(MCF_BUSCLK, mcfslt_clk.shift);
+ clocksource_register(&mcfslt_clk);
+
+#ifdef CONFIG_HIGHPROFILE
+ mcfslt_profile_init();
+#endif
+}
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