arch/arm/mach-clps711x/common.c - maze/linux - Git at Google

 /*
  *  linux/arch/arm/mach-clps711x/core.c
  *
  *  Core support for the CLPS711x-based machines.
  *
  *  Copyright (C) 2001,2011 Deep Blue Solutions Ltd
  *
  * 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  */
 #include <linux/io.h>
 #include <linux/init.h>
 #include <linux/sizes.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/clk.h>
 #include <linux/clkdev.h>
 #include <linux/clockchips.h>
 #include <linux/clocksource.h>
 #include <linux/clk-provider.h>

 #include <asm/exception.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/map.h>
 #include <asm/mach/time.h>
 #include <asm/sched_clock.h>
 #include <asm/system_misc.h>

 #include <mach/hardware.h>

 static struct clk *clk_pll, *clk_bus, *clk_uart, *clk_timerl, *clk_timerh,
 		  *clk_tint, *clk_spi;

 /*
  * This maps the generic CLPS711x registers
  */
 static struct map_desc clps711x_io_desc[] __initdata = {
 	{
 		.virtual	= (unsigned long)CLPS711X_VIRT_BASE,
 		.pfn		= __phys_to_pfn(CLPS711X_PHYS_BASE),
 		.length		= SZ_64K,
 		.type		= MT_DEVICE
 	}
 };

 void __init clps711x_map_io(void)
 {
 	iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
 }

 static void int1_mask(struct irq_data *d)
 {
 	u32 intmr1;

 	intmr1 = clps_readl(INTMR1);
 	intmr1 &= ~(1 << d->irq);
 	clps_writel(intmr1, INTMR1);
 }

 static void int1_eoi(struct irq_data *d)
 {
 	switch (d->irq) {
 	case IRQ_CSINT:  clps_writel(0, COEOI);  break;
 	case IRQ_TC1OI:  clps_writel(0, TC1EOI); break;
 	case IRQ_TC2OI:  clps_writel(0, TC2EOI); break;
 	case IRQ_RTCMI:  clps_writel(0, RTCEOI); break;
 	case IRQ_TINT:   clps_writel(0, TEOI);   break;
 	case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
 	}
 }

 static void int1_unmask(struct irq_data *d)
 {
 	u32 intmr1;

 	intmr1 = clps_readl(INTMR1);
 	intmr1 |= 1 << d->irq;
 	clps_writel(intmr1, INTMR1);
 }

 static struct irq_chip int1_chip = {
 	.name		= "Interrupt Vector 1",
 	.irq_eoi	= int1_eoi,
 	.irq_mask	= int1_mask,
 	.irq_unmask	= int1_unmask,
 };

 static void int2_mask(struct irq_data *d)
 {
 	u32 intmr2;

 	intmr2 = clps_readl(INTMR2);
 	intmr2 &= ~(1 << (d->irq - 16));
 	clps_writel(intmr2, INTMR2);
 }

 static void int2_eoi(struct irq_data *d)
 {
 	switch (d->irq) {
 	case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
 	}
 }

 static void int2_unmask(struct irq_data *d)
 {
 	u32 intmr2;

 	intmr2 = clps_readl(INTMR2);
 	intmr2 |= 1 << (d->irq - 16);
 	clps_writel(intmr2, INTMR2);
 }

 static struct irq_chip int2_chip = {
 	.name		= "Interrupt Vector 2",
 	.irq_eoi	= int2_eoi,
 	.irq_mask	= int2_mask,
 	.irq_unmask	= int2_unmask,
 };

 static void int3_mask(struct irq_data *d)
 {
 	u32 intmr3;

 	intmr3 = clps_readl(INTMR3);
 	intmr3 &= ~(1 << (d->irq - 32));
 	clps_writel(intmr3, INTMR3);
 }

 static void int3_unmask(struct irq_data *d)
 {
 	u32 intmr3;

 	intmr3 = clps_readl(INTMR3);
 	intmr3 |= 1 << (d->irq - 32);
 	clps_writel(intmr3, INTMR3);
 }

 static struct irq_chip int3_chip = {
 	.name		= "Interrupt Vector 3",
 	.irq_mask	= int3_mask,
 	.irq_unmask	= int3_unmask,
 };

 static struct {
 	int			nr;
 	struct irq_chip		*chip;
 	irq_flow_handler_t	handle;
 } clps711x_irqdescs[] __initdata = {
 	{ IRQ_CSINT,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_EINT1,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_EINT2,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_EINT3,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_TC1OI,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_TC2OI,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_RTCMI,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_TINT,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_UTXINT1,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_URXINT1,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_UMSINT,	&int1_chip,	handle_fasteoi_irq,	},
 	{ IRQ_SSEOTI,	&int1_chip,	handle_level_irq,	},
 	{ IRQ_KBDINT,	&int2_chip,	handle_fasteoi_irq,	},
 	{ IRQ_SS2RX,	&int2_chip,	handle_level_irq,	},
 	{ IRQ_SS2TX,	&int2_chip,	handle_level_irq,	},
 	{ IRQ_UTXINT2,	&int2_chip,	handle_level_irq,	},
 	{ IRQ_URXINT2,	&int2_chip,	handle_level_irq,	},
 };

 void __init clps711x_init_irq(void)
 {
 	unsigned int i;

 	/* Disable interrupts */
 	clps_writel(0, INTMR1);
 	clps_writel(0, INTMR2);
 	clps_writel(0, INTMR3);

 	/* Clear down any pending interrupts */
 	clps_writel(0, BLEOI);
 	clps_writel(0, MCEOI);
 	clps_writel(0, COEOI);
 	clps_writel(0, TC1EOI);
 	clps_writel(0, TC2EOI);
 	clps_writel(0, RTCEOI);
 	clps_writel(0, TEOI);
 	clps_writel(0, UMSEOI);
 	clps_writel(0, KBDEOI);
 	clps_writel(0, SRXEOF);
 	clps_writel(0xffffffff, DAISR);

 	for (i = 0; i < ARRAY_SIZE(clps711x_irqdescs); i++) {
 		irq_set_chip_and_handler(clps711x_irqdescs[i].nr,
 					 clps711x_irqdescs[i].chip,
 					 clps711x_irqdescs[i].handle);
 		set_irq_flags(clps711x_irqdescs[i].nr,
 			      IRQF_VALID | IRQF_PROBE);
 	}

 	if (IS_ENABLED(CONFIG_FIQ)) {
 		init_FIQ(0);
 		irq_set_chip_and_handler(IRQ_DAIINT, &int3_chip,
 					 handle_bad_irq);
 		set_irq_flags(IRQ_DAIINT,
 			      IRQF_VALID | IRQF_PROBE | IRQF_NOAUTOEN);
 	}
 }

 static inline u32 fls16(u32 x)
 {
 	u32 r = 15;

 	if (!(x & 0xff00)) {
 		x <<= 8;
 		r -= 8;
 	}
 	if (!(x & 0xf000)) {
 		x <<= 4;
 		r -= 4;
 	}
 	if (!(x & 0xc000)) {
 		x <<= 2;
 		r -= 2;
 	}
 	if (!(x & 0x8000))
 		r--;

 	return r;
 }

 asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
 {
 	do {
 		u32 irqstat;
 		void __iomem *base = CLPS711X_VIRT_BASE;

 		irqstat = readw_relaxed(base + INTSR1) &
 			  readw_relaxed(base + INTMR1);
 		if (irqstat)
 			handle_IRQ(fls16(irqstat), regs);

 		irqstat = readw_relaxed(base + INTSR2) &
 			  readw_relaxed(base + INTMR2);
 		if (irqstat) {
 			handle_IRQ(fls16(irqstat) + 16, regs);
 			continue;
 		}

 		break;
 	} while (1);
 }

 static u32 notrace clps711x_sched_clock_read(void)
 {
 	return ~readw_relaxed(CLPS711X_VIRT_BASE + TC1D);
 }

 static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
 					 struct clock_event_device *evt)
 {
 	disable_irq(IRQ_TC2OI);

 	switch (mode) {
 	case CLOCK_EVT_MODE_PERIODIC:
 		enable_irq(IRQ_TC2OI);
 		break;
 	case CLOCK_EVT_MODE_ONESHOT:
 		/* Not supported */
 	case CLOCK_EVT_MODE_SHUTDOWN:
 	case CLOCK_EVT_MODE_UNUSED:
 	case CLOCK_EVT_MODE_RESUME:
 		/* Left event sources disabled, no more interrupts appear */
 		break;
 	}
 }

 static struct clock_event_device clockevent_clps711x = {
 	.name		= "clps711x-clockevent",
 	.rating		= 300,
 	.features	= CLOCK_EVT_FEAT_PERIODIC,
 	.set_mode	= clps711x_clockevent_set_mode,
 };

 static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id)
 {
 	clockevent_clps711x.event_handler(&clockevent_clps711x);

 	return IRQ_HANDLED;
 }

 static struct irqaction clps711x_timer_irq = {
 	.name		= "clps711x-timer",
 	.flags		= IRQF_TIMER | IRQF_IRQPOLL,
 	.handler	= clps711x_timer_interrupt,
 };

 static void add_fixed_clk(struct clk *clk, const char *name, int rate)
 {
 	clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);
 	clk_register_clkdev(clk, name, NULL);
 }

 void __init clps711x_timer_init(void)
 {
 	int osc, ext, pll, cpu, bus, timl, timh, uart, spi;
 	u32 tmp;

 	osc = 3686400;
 	ext = 13000000;

 	tmp = clps_readl(PLLR) >> 24;
 	if (tmp)
 		pll = (osc * tmp) / 2;
 	else
 		pll = 73728000; /* Default value */

 	tmp = clps_readl(SYSFLG2);
 	if (tmp & SYSFLG2_CKMODE) {
 		cpu = ext;
 		bus = cpu;
 		spi = 135400;
 		pll = 0;
 	} else {
 		cpu = pll;
 		if (cpu >= 36864000)
 			bus = cpu / 2;
 		else
 			bus = 36864000 / 2;
 		spi = cpu / 576;
 	}

 	uart = bus / 10;

 	if (tmp & SYSFLG2_CKMODE) {
 		tmp = clps_readl(SYSCON2);
 		if (tmp & SYSCON2_OSTB)
 			timh = ext / 26;
 		else
 			timh = 541440;
 	} else
 		timh = DIV_ROUND_CLOSEST(cpu, 144);

 	timl = DIV_ROUND_CLOSEST(timh, 256);

 	/* All clocks are fixed */
 	add_fixed_clk(clk_pll, "pll", pll);
 	add_fixed_clk(clk_bus, "bus", bus);
 	add_fixed_clk(clk_uart, "uart", uart);
 	add_fixed_clk(clk_timerl, "timer_lf", timl);
 	add_fixed_clk(clk_timerh, "timer_hf", timh);
 	add_fixed_clk(clk_tint, "tint", 64);
 	add_fixed_clk(clk_spi, "spi", spi);

 	pr_info("CPU frequency set at %i Hz.\n", cpu);

 	/* Start Timer1 in free running mode (Low frequency) */
 	tmp = clps_readl(SYSCON1) & ~(SYSCON1_TC1S | SYSCON1_TC1M);
 	clps_writel(tmp, SYSCON1);

 	setup_sched_clock(clps711x_sched_clock_read, 16, timl);

 	clocksource_mmio_init(CLPS711X_VIRT_BASE + TC1D,
 			      "clps711x_clocksource", timl, 300, 16,
 			      clocksource_mmio_readw_down);

 	/* Set Timer2 prescaler */
 	clps_writew(DIV_ROUND_CLOSEST(timh, HZ), TC2D);

 	/* Start Timer2 in prescale mode (High frequency)*/
 	tmp = clps_readl(SYSCON1) | SYSCON1_TC2M | SYSCON1_TC2S;
 	clps_writel(tmp, SYSCON1);

 	clockevents_config_and_register(&clockevent_clps711x, timh, 0, 0);

 	setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
 }

 void clps711x_restart(enum reboot_mode mode, const char *cmd)
 {
 	soft_restart(0);
 }

 static void clps711x_idle(void)
 {
 	clps_writel(1, HALT);
 	asm("mov r0, r0");
 	asm("mov r0, r0");
 }

 void __init clps711x_init_early(void)
 {
 	arm_pm_idle = clps711x_idle;
 }
	/*
	* linux/arch/arm/mach-clps711x/core.c
	*
	* Core support for the CLPS711x-based machines.
	*
	* Copyright (C) 2001,2011 Deep Blue Solutions Ltd
	*
	* 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	*/
	#include <linux/io.h>
	#include <linux/init.h>
	#include <linux/sizes.h>
	#include <linux/interrupt.h>
	#include <linux/irq.h>
	#include <linux/clk.h>
	#include <linux/clkdev.h>
	#include <linux/clockchips.h>
	#include <linux/clocksource.h>
	#include <linux/clk-provider.h>

	#include <asm/exception.h>
	#include <asm/mach/irq.h>
	#include <asm/mach/map.h>
	#include <asm/mach/time.h>
	#include <asm/sched_clock.h>
	#include <asm/system_misc.h>

	#include <mach/hardware.h>

	static struct clk clk_pll, clk_bus, clk_uart, clk_timerl, *clk_timerh,
	clk_tint, clk_spi;

	/*
	* This maps the generic CLPS711x registers
	*/
	static struct map_desc clps711x_io_desc[] __initdata = {
	{
	.virtual = (unsigned long)CLPS711X_VIRT_BASE,
	.pfn = __phys_to_pfn(CLPS711X_PHYS_BASE),
	.length = SZ_64K,
	.type = MT_DEVICE
	}
	};

	void __init clps711x_map_io(void)
	{
	iotable_init(clps711x_io_desc, ARRAY_SIZE(clps711x_io_desc));
	}

	static void int1_mask(struct irq_data *d)
	{
	u32 intmr1;

	intmr1 = clps_readl(INTMR1);
	intmr1 &= ~(1 << d->irq);
	clps_writel(intmr1, INTMR1);
	}

	static void int1_eoi(struct irq_data *d)
	{
	switch (d->irq) {
	case IRQ_CSINT: clps_writel(0, COEOI); break;
	case IRQ_TC1OI: clps_writel(0, TC1EOI); break;
	case IRQ_TC2OI: clps_writel(0, TC2EOI); break;
	case IRQ_RTCMI: clps_writel(0, RTCEOI); break;
	case IRQ_TINT: clps_writel(0, TEOI); break;
	case IRQ_UMSINT: clps_writel(0, UMSEOI); break;
	}
	}

	static void int1_unmask(struct irq_data *d)
	{
	u32 intmr1;

	intmr1 = clps_readl(INTMR1);
	intmr1 \|= 1 << d->irq;
	clps_writel(intmr1, INTMR1);
	}

	static struct irq_chip int1_chip = {
	.name = "Interrupt Vector 1",
	.irq_eoi = int1_eoi,
	.irq_mask = int1_mask,
	.irq_unmask = int1_unmask,
	};

	static void int2_mask(struct irq_data *d)
	{
	u32 intmr2;

	intmr2 = clps_readl(INTMR2);
	intmr2 &= ~(1 << (d->irq - 16));
	clps_writel(intmr2, INTMR2);
	}

	static void int2_eoi(struct irq_data *d)
	{
	switch (d->irq) {
	case IRQ_KBDINT: clps_writel(0, KBDEOI); break;
	}
	}

	static void int2_unmask(struct irq_data *d)
	{
	u32 intmr2;

	intmr2 = clps_readl(INTMR2);
	intmr2 \|= 1 << (d->irq - 16);
	clps_writel(intmr2, INTMR2);
	}

	static struct irq_chip int2_chip = {
	.name = "Interrupt Vector 2",
	.irq_eoi = int2_eoi,
	.irq_mask = int2_mask,
	.irq_unmask = int2_unmask,
	};

	static void int3_mask(struct irq_data *d)
	{
	u32 intmr3;

	intmr3 = clps_readl(INTMR3);
	intmr3 &= ~(1 << (d->irq - 32));
	clps_writel(intmr3, INTMR3);
	}

	static void int3_unmask(struct irq_data *d)
	{
	u32 intmr3;

	intmr3 = clps_readl(INTMR3);
	intmr3 \|= 1 << (d->irq - 32);
	clps_writel(intmr3, INTMR3);
	}

	static struct irq_chip int3_chip = {
	.name = "Interrupt Vector 3",
	.irq_mask = int3_mask,
	.irq_unmask = int3_unmask,
	};

	static struct {
	int nr;
	struct irq_chip *chip;
	irq_flow_handler_t handle;
	} clps711x_irqdescs[] __initdata = {
	{ IRQ_CSINT, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_EINT1, &int1_chip, handle_level_irq, },
	{ IRQ_EINT2, &int1_chip, handle_level_irq, },
	{ IRQ_EINT3, &int1_chip, handle_level_irq, },
	{ IRQ_TC1OI, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_TC2OI, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_RTCMI, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_TINT, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_UTXINT1, &int1_chip, handle_level_irq, },
	{ IRQ_URXINT1, &int1_chip, handle_level_irq, },
	{ IRQ_UMSINT, &int1_chip, handle_fasteoi_irq, },
	{ IRQ_SSEOTI, &int1_chip, handle_level_irq, },
	{ IRQ_KBDINT, &int2_chip, handle_fasteoi_irq, },
	{ IRQ_SS2RX, &int2_chip, handle_level_irq, },
	{ IRQ_SS2TX, &int2_chip, handle_level_irq, },
	{ IRQ_UTXINT2, &int2_chip, handle_level_irq, },
	{ IRQ_URXINT2, &int2_chip, handle_level_irq, },
	};

	void __init clps711x_init_irq(void)
	{
	unsigned int i;

	/* Disable interrupts */
	clps_writel(0, INTMR1);
	clps_writel(0, INTMR2);
	clps_writel(0, INTMR3);

	/* Clear down any pending interrupts */
	clps_writel(0, BLEOI);
	clps_writel(0, MCEOI);
	clps_writel(0, COEOI);
	clps_writel(0, TC1EOI);
	clps_writel(0, TC2EOI);
	clps_writel(0, RTCEOI);
	clps_writel(0, TEOI);
	clps_writel(0, UMSEOI);
	clps_writel(0, KBDEOI);
	clps_writel(0, SRXEOF);
	clps_writel(0xffffffff, DAISR);

	for (i = 0; i < ARRAY_SIZE(clps711x_irqdescs); i++) {
	irq_set_chip_and_handler(clps711x_irqdescs[i].nr,
	clps711x_irqdescs[i].chip,
	clps711x_irqdescs[i].handle);
	set_irq_flags(clps711x_irqdescs[i].nr,
	IRQF_VALID \| IRQF_PROBE);
	}

	if (IS_ENABLED(CONFIG_FIQ)) {
	init_FIQ(0);
	irq_set_chip_and_handler(IRQ_DAIINT, &int3_chip,
	handle_bad_irq);
	set_irq_flags(IRQ_DAIINT,
	IRQF_VALID \| IRQF_PROBE \| IRQF_NOAUTOEN);
	}
	}

	static inline u32 fls16(u32 x)
	{
	u32 r = 15;

	if (!(x & 0xff00)) {
	x <<= 8;
	r -= 8;
	}
	if (!(x & 0xf000)) {
	x <<= 4;
	r -= 4;
	}
	if (!(x & 0xc000)) {
	x <<= 2;
	r -= 2;
	}
	if (!(x & 0x8000))
	r--;

	return r;
	}

	asmlinkage void __exception_irq_entry clps711x_handle_irq(struct pt_regs *regs)
	{
	do {
	u32 irqstat;
	void __iomem *base = CLPS711X_VIRT_BASE;

	irqstat = readw_relaxed(base + INTSR1) &
	readw_relaxed(base + INTMR1);
	if (irqstat)
	handle_IRQ(fls16(irqstat), regs);

	irqstat = readw_relaxed(base + INTSR2) &
	readw_relaxed(base + INTMR2);
	if (irqstat) {
	handle_IRQ(fls16(irqstat) + 16, regs);
	continue;
	}

	break;
	} while (1);
	}

	static u32 notrace clps711x_sched_clock_read(void)
	{
	return ~readw_relaxed(CLPS711X_VIRT_BASE + TC1D);
	}

	static void clps711x_clockevent_set_mode(enum clock_event_mode mode,
	struct clock_event_device *evt)
	{
	disable_irq(IRQ_TC2OI);

	switch (mode) {
	case CLOCK_EVT_MODE_PERIODIC:
	enable_irq(IRQ_TC2OI);
	break;
	case CLOCK_EVT_MODE_ONESHOT:
	/* Not supported */
	case CLOCK_EVT_MODE_SHUTDOWN:
	case CLOCK_EVT_MODE_UNUSED:
	case CLOCK_EVT_MODE_RESUME:
	/* Left event sources disabled, no more interrupts appear */
	break;
	}
	}

	static struct clock_event_device clockevent_clps711x = {
	.name = "clps711x-clockevent",
	.rating = 300,
	.features = CLOCK_EVT_FEAT_PERIODIC,
	.set_mode = clps711x_clockevent_set_mode,
	};

	static irqreturn_t clps711x_timer_interrupt(int irq, void *dev_id)
	{
	clockevent_clps711x.event_handler(&clockevent_clps711x);

	return IRQ_HANDLED;
	}

	static struct irqaction clps711x_timer_irq = {
	.name = "clps711x-timer",
	.flags = IRQF_TIMER \| IRQF_IRQPOLL,
	.handler = clps711x_timer_interrupt,
	};

	static void add_fixed_clk(struct clk clk, const char name, int rate)
	{
	clk = clk_register_fixed_rate(NULL, name, NULL, CLK_IS_ROOT, rate);
	clk_register_clkdev(clk, name, NULL);
	}

	void __init clps711x_timer_init(void)
	{
	int osc, ext, pll, cpu, bus, timl, timh, uart, spi;
	u32 tmp;

	osc = 3686400;
	ext = 13000000;

	tmp = clps_readl(PLLR) >> 24;
	if (tmp)
	pll = (osc * tmp) / 2;
	else
	pll = 73728000; /* Default value */

	tmp = clps_readl(SYSFLG2);
	if (tmp & SYSFLG2_CKMODE) {
	cpu = ext;
	bus = cpu;
	spi = 135400;
	pll = 0;
	} else {
	cpu = pll;
	if (cpu >= 36864000)
	bus = cpu / 2;
	else
	bus = 36864000 / 2;
	spi = cpu / 576;
	}

	uart = bus / 10;

	if (tmp & SYSFLG2_CKMODE) {
	tmp = clps_readl(SYSCON2);
	if (tmp & SYSCON2_OSTB)
	timh = ext / 26;
	else
	timh = 541440;
	} else
	timh = DIV_ROUND_CLOSEST(cpu, 144);

	timl = DIV_ROUND_CLOSEST(timh, 256);

	/* All clocks are fixed */
	add_fixed_clk(clk_pll, "pll", pll);
	add_fixed_clk(clk_bus, "bus", bus);
	add_fixed_clk(clk_uart, "uart", uart);
	add_fixed_clk(clk_timerl, "timer_lf", timl);
	add_fixed_clk(clk_timerh, "timer_hf", timh);
	add_fixed_clk(clk_tint, "tint", 64);
	add_fixed_clk(clk_spi, "spi", spi);

	pr_info("CPU frequency set at %i Hz.\n", cpu);

	/* Start Timer1 in free running mode (Low frequency) */
	tmp = clps_readl(SYSCON1) & ~(SYSCON1_TC1S \| SYSCON1_TC1M);
	clps_writel(tmp, SYSCON1);

	setup_sched_clock(clps711x_sched_clock_read, 16, timl);

	clocksource_mmio_init(CLPS711X_VIRT_BASE + TC1D,
	"clps711x_clocksource", timl, 300, 16,
	clocksource_mmio_readw_down);

	/* Set Timer2 prescaler */
	clps_writew(DIV_ROUND_CLOSEST(timh, HZ), TC2D);

	/* Start Timer2 in prescale mode (High frequency)*/
	tmp = clps_readl(SYSCON1) \| SYSCON1_TC2M \| SYSCON1_TC2S;
	clps_writel(tmp, SYSCON1);

	clockevents_config_and_register(&clockevent_clps711x, timh, 0, 0);

	setup_irq(IRQ_TC2OI, &clps711x_timer_irq);
	}

	void clps711x_restart(enum reboot_mode mode, const char *cmd)
	{
	soft_restart(0);
	}

	static void clps711x_idle(void)
	{
	clps_writel(1, HALT);
	asm("mov r0, r0");
	asm("mov r0, r0");
	}

	void __init clps711x_init_early(void)
	{
	arm_pm_idle = clps711x_idle;
	}