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>

arch/m68k/include/asm/cacheflush_no.h

@@ -29,7 +29,7 @@
 
 static inline void __flush_cache_all(void)
 {
-#ifdef CONFIG_M5407
+#if defined(CONFIG_M5407) || defined(CONFIG_M548x)
 	/*
 	 *	Use cpushl to push and invalidate all cache lines.
 	 *	Gas doesn't seem to know how to generate the ColdFire

arch/m68k/include/asm/coldfire.h

@@ -32,7 +32,9 @@
  */
 #define	MCF_MBAR	0x10000000
 #define	MCF_MBAR2	0x80000000
-#if defined(CONFIG_M520x)
+#if defined(CONFIG_M548x)
+#define	MCF_IPSBAR	MCF_MBAR
+#elif defined(CONFIG_M520x)
 #define	MCF_IPSBAR	0xFC000000
 #else
 #define	MCF_IPSBAR	0x40000000

arch/m68k/include/asm/gpio.h

@@ -36,7 +36,8 @@
  */
 #if defined(CONFIG_M5206) || defined(CONFIG_M5206e) || \
     defined(CONFIG_M520x) || defined(CONFIG_M523x) || \
-    defined(CONFIG_M527x) || defined(CONFIG_M528x) || defined(CONFIG_M532x)
+    defined(CONFIG_M527x) || defined(CONFIG_M528x) || \
+    defined(CONFIG_M532x) || defined(CONFIG_M548x)
 
 /* These parts have GPIO organized by 8 bit ports */
 
@@ -136,6 +137,8 @@ static inline u32 __mcf_gpio_ppdr(unsigned gpio)
 #endif
 	else
 		return MCFGPIO_PPDR + mcfgpio_port(gpio - MCFGPIO_SCR_START);
+#else
+	return 0;
 #endif
 }
 
@@ -173,6 +176,8 @@ static inline u32 __mcf_gpio_podr(unsigned gpio)
 #endif
 	else
 		return MCFGPIO_PODR + mcfgpio_port(gpio - MCFGPIO_SCR_START);
+#else
+	return 0;
 #endif
 }
 

arch/m68k/include/asm/m548xgpt.h

@@ -0,0 +1,88 @@
+/*
+ * File:	m548xgpt.h
+ * Purpose:	Register and bit definitions for the MCF548X
+ *
+ * Notes:
+ *
+ */
+
+#ifndef m548xgpt_h
+#define m548xgpt_h
+
+/*********************************************************************
+*
+* General Purpose Timers (GPT)
+*
+*********************************************************************/
+
+/* Register read/write macros */
+#define MCF_GPT_GMS0       0x000800
+#define MCF_GPT_GCIR0      0x000804
+#define MCF_GPT_GPWM0      0x000808
+#define MCF_GPT_GSR0       0x00080C
+#define MCF_GPT_GMS1       0x000810
+#define MCF_GPT_GCIR1      0x000814
+#define MCF_GPT_GPWM1      0x000818
+#define MCF_GPT_GSR1       0x00081C
+#define MCF_GPT_GMS2       0x000820
+#define MCF_GPT_GCIR2      0x000824
+#define MCF_GPT_GPWM2      0x000828
+#define MCF_GPT_GSR2       0x00082C
+#define MCF_GPT_GMS3       0x000830
+#define MCF_GPT_GCIR3      0x000834
+#define MCF_GPT_GPWM3      0x000838
+#define MCF_GPT_GSR3       0x00083C
+#define MCF_GPT_GMS(x)     (0x000800+((x)*0x010))
+#define MCF_GPT_GCIR(x)    (0x000804+((x)*0x010))
+#define MCF_GPT_GPWM(x)    (0x000808+((x)*0x010))
+#define MCF_GPT_GSR(x)     (0x00080C+((x)*0x010))
+
+/* Bit definitions and macros for MCF_GPT_GMS */
+#define MCF_GPT_GMS_TMS(x)         (((x)&0x00000007)<<0)
+#define MCF_GPT_GMS_GPIO(x)        (((x)&0x00000003)<<4)
+#define MCF_GPT_GMS_IEN            (0x00000100)
+#define MCF_GPT_GMS_OD             (0x00000200)
+#define MCF_GPT_GMS_SC             (0x00000400)
+#define MCF_GPT_GMS_CE             (0x00001000)
+#define MCF_GPT_GMS_WDEN           (0x00008000)
+#define MCF_GPT_GMS_ICT(x)         (((x)&0x00000003)<<16)
+#define MCF_GPT_GMS_OCT(x)         (((x)&0x00000003)<<20)
+#define MCF_GPT_GMS_OCPW(x)        (((x)&0x000000FF)<<24)
+#define MCF_GPT_GMS_OCT_FRCLOW     (0x00000000)
+#define MCF_GPT_GMS_OCT_PULSEHI    (0x00100000)
+#define MCF_GPT_GMS_OCT_PULSELO    (0x00200000)
+#define MCF_GPT_GMS_OCT_TOGGLE     (0x00300000)
+#define MCF_GPT_GMS_ICT_ANY        (0x00000000)
+#define MCF_GPT_GMS_ICT_RISE       (0x00010000)
+#define MCF_GPT_GMS_ICT_FALL       (0x00020000)
+#define MCF_GPT_GMS_ICT_PULSE      (0x00030000)
+#define MCF_GPT_GMS_GPIO_INPUT     (0x00000000)
+#define MCF_GPT_GMS_GPIO_OUTLO     (0x00000020)
+#define MCF_GPT_GMS_GPIO_OUTHI     (0x00000030)
+#define MCF_GPT_GMS_TMS_DISABLE    (0x00000000)
+#define MCF_GPT_GMS_TMS_INCAPT     (0x00000001)
+#define MCF_GPT_GMS_TMS_OUTCAPT    (0x00000002)
+#define MCF_GPT_GMS_TMS_PWM        (0x00000003)
+#define MCF_GPT_GMS_TMS_GPIO       (0x00000004)
+
+/* Bit definitions and macros for MCF_GPT_GCIR */
+#define MCF_GPT_GCIR_CNT(x)        (((x)&0x0000FFFF)<<0)
+#define MCF_GPT_GCIR_PRE(x)        (((x)&0x0000FFFF)<<16)
+
+/* Bit definitions and macros for MCF_GPT_GPWM */
+#define MCF_GPT_GPWM_LOAD          (0x00000001)
+#define MCF_GPT_GPWM_PWMOP         (0x00000100)
+#define MCF_GPT_GPWM_WIDTH(x)      (((x)&0x0000FFFF)<<16)
+
+/* Bit definitions and macros for MCF_GPT_GSR */
+#define MCF_GPT_GSR_CAPT           (0x00000001)
+#define MCF_GPT_GSR_COMP           (0x00000002)
+#define MCF_GPT_GSR_PWMP           (0x00000004)
+#define MCF_GPT_GSR_TEXP           (0x00000008)
+#define MCF_GPT_GSR_PIN            (0x00000100)
+#define MCF_GPT_GSR_OVF(x)         (((x)&0x00000007)<<12)
+#define MCF_GPT_GSR_CAPTURE(x)     (((x)&0x0000FFFF)<<16)
+
+/********************************************************************/
+
+#endif /* m548xgpt_h */

arch/m68k/include/asm/m548xsim.h

@@ -0,0 +1,55 @@
+/*
+ *	m548xsim.h -- ColdFire 547x/548x System Integration Unit support.
+ */
+
+#ifndef	m548xsim_h
+#define m548xsim_h
+
+#define MCFINT_VECBASE      64
+
+/*
+ *      Interrupt Controller Registers
+ */
+#define MCFICM_INTC0		0x0700		/* Base for Interrupt Ctrl 0 */
+#define MCFINTC_IPRH		0x00		/* Interrupt pending 32-63 */
+#define MCFINTC_IPRL		0x04		/* Interrupt pending 1-31 */
+#define MCFINTC_IMRH		0x08		/* Interrupt mask 32-63 */
+#define MCFINTC_IMRL		0x0c		/* Interrupt mask 1-31 */
+#define MCFINTC_INTFRCH		0x10		/* Interrupt force 32-63 */
+#define MCFINTC_INTFRCL		0x14		/* Interrupt force 1-31 */
+#define MCFINTC_IRLR		0x18		/* */
+#define MCFINTC_IACKL		0x19		/* */
+#define MCFINTC_ICR0		0x40		/* Base ICR register */
+
+/*
+ *	Define system peripheral IRQ usage.
+ */
+#define MCF_IRQ_TIMER		(64 + 54)	/* Slice Timer 0 */
+#define MCF_IRQ_PROFILER	(64 + 53)	/* Slice Timer 1 */
+
+/*
+ *	Generic GPIO support
+ */
+#define MCFGPIO_PIN_MAX		0	/* I am too lazy to count */
+#define MCFGPIO_IRQ_MAX		-1
+#define MCFGPIO_IRQ_VECBASE	-1
+
+/*
+ *	Some PSC related definitions
+ */
+#define MCF_PAR_PSC(x)		(0x000A4F-((x)&0x3))
+#define MCF_PAR_SDA		(0x0008)
+#define MCF_PAR_SCL		(0x0004)
+#define MCF_PAR_PSC_TXD		(0x04)
+#define MCF_PAR_PSC_RXD		(0x08)
+#define MCF_PAR_PSC_RTS(x)	(((x)&0x03)<<4)
+#define MCF_PAR_PSC_CTS(x)	(((x)&0x03)<<6)
+#define MCF_PAR_PSC_CTS_GPIO	(0x00)
+#define MCF_PAR_PSC_CTS_BCLK	(0x80)
+#define MCF_PAR_PSC_CTS_CTS	(0xC0)
+#define MCF_PAR_PSC_RTS_GPIO    (0x00)
+#define MCF_PAR_PSC_RTS_FSYNC	(0x20)
+#define MCF_PAR_PSC_RTS_RTS	(0x30)
+#define MCF_PAR_PSC_CANRX	(0x40)
+
+#endif	/* m548xsim_h */

arch/m68k/include/asm/mcfcache.h

@@ -107,7 +107,7 @@
 .endm
 #endif /* CONFIG_M532x */
 
-#if defined(CONFIG_M5407)
+#if defined(CONFIG_M5407) || defined(CONFIG_M548x)
 /*
  *	Version 4 cores have a true harvard style separate instruction
  *	and data cache. Invalidate and enable cache, also enable write

arch/m68k/include/asm/mcfsim.h

@@ -41,6 +41,8 @@
 #elif defined(CONFIG_M5407)
 #include <asm/m5407sim.h>
 #include <asm/mcfintc.h>
+#elif defined(CONFIG_M548x)
+#include <asm/m548xsim.h>
 #endif
 
 /****************************************************************************/

arch/m68k/include/asm/mcfslt.h

@@ -0,0 +1,44 @@
+/****************************************************************************/
+
+/*
+ *	mcfslt.h -- ColdFire internal Slice (SLT) timer support defines.
+ *
+ *	(C) Copyright 2004, Greg Ungerer (gerg@snapgear.com)
+ *	(C) Copyright 2009, Philippe De Muyter (phdm@macqel.be)
+ */
+
+/****************************************************************************/
+#ifndef mcfslt_h
+#define mcfslt_h
+/****************************************************************************/
+
+/*
+ *	Get address specific defines for the 547x.
+ */
+#define MCFSLT_TIMER0		0x900	/* Base address of TIMER0 */
+#define MCFSLT_TIMER1		0x910	/* Base address of TIMER1 */
+
+
+/*
+ *	Define the SLT timer register set addresses.
+ */
+#define MCFSLT_STCNT		0x00	/* Terminal count */
+#define MCFSLT_SCR		0x04	/* Control */
+#define MCFSLT_SCNT		0x08	/* Current count */
+#define MCFSLT_SSR		0x0C	/* Status */
+
+/*
+ *	Bit definitions for the SCR control register.
+ */
+#define MCFSLT_SCR_RUN		0x04000000	/* Run mode (continuous) */
+#define MCFSLT_SCR_IEN		0x02000000	/* Interrupt enable */
+#define MCFSLT_SCR_TEN		0x01000000	/* Timer enable */
+
+/*
+ *	Bit definitions for the SSR status register.
+ */
+#define MCFSLT_SSR_BE		0x02000000	/* Bus error condition */
+#define MCFSLT_SSR_TE		0x01000000	/* Timeout condition */
+
+/****************************************************************************/
+#endif	/* mcfslt_h */

arch/m68k/include/asm/mcfuart.h

@@ -47,6 +47,11 @@
 #define MCFUART_BASE1		0xfc060000	/* Base address of UART1 */
 #define MCFUART_BASE2		0xfc064000	/* Base address of UART2 */
 #define MCFUART_BASE3		0xfc068000	/* Base address of UART3 */
+#elif defined(CONFIG_M548x)
+#define MCFUART_BASE1		0x8600		/* on M548x */
+#define MCFUART_BASE2		0x8700		/* on M548x */
+#define MCFUART_BASE3		0x8800		/* on M548x */
+#define MCFUART_BASE4		0x8900		/* on M548x */
 #endif
 
 

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

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

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
+

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);
+
+/***************************************************************************/

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

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
+}