sh: SH-5 clk fwk support. (4d01cdaf) · Commits · EulixOS / Software / Kernel

arch/sh/kernel/cpu/sh5/Makefile

+5 −0

Original line number	Diff line number	Diff line
		@@ -5,3 +5,8 @@ obj-y := entry.o probe.o switchto.o

		obj-$(CONFIG_SH_FPU) += fpu.o
		obj-$(CONFIG_KALLSYMS) += unwind.o

		# Primary on-chip clocks (common)
		clock-$(CONFIG_CPU_SH5) := clock-sh5.o

		obj-y += $(clock-y)

arch/sh/kernel/cpu/sh5/clock-sh5.c

0 → 100644

+79 −0

Original line number	Diff line number	Diff line
		/*
		* arch/sh/kernel/cpu/sh5/clock-sh5.c
		*
		* SH-5 support for the clock framework
		*
		* Copyright (C) 2008 Paul Mundt
		*
		* This file is subject to the terms and conditions of the GNU General Public
		* License. See the file "COPYING" in the main directory of this archive
		* for more details.
		*/
		#include <linux/init.h>
		#include <linux/kernel.h>
		#include <asm/clock.h>
		#include <asm/io.h>

		static int ifc_table[] = { 2, 4, 6, 8, 10, 12, 16, 24 };

		/* Clock, Power and Reset Controller */
		#define CPRC_BLOCK_OFF 0x01010000
		#define CPRC_BASE (PHYS_PERIPHERAL_BLOCK + CPRC_BLOCK_OFF)

		static unsigned long cprc_base;

		static void master_clk_init(struct clk *clk)
		{
		int idx = (ctrl_inl(cprc_base + 0x00) >> 6) & 0x0007;
		clk->rate *= ifc_table[idx];
		}

		static struct clk_ops sh5_master_clk_ops = {
		.init = master_clk_init,
		};

		static void module_clk_recalc(struct clk *clk)
		{
		int idx = (ctrl_inw(cprc_base) >> 12) & 0x0007;
		clk->rate = clk->parent->rate / ifc_table[idx];
		}

		static struct clk_ops sh5_module_clk_ops = {
		.recalc = module_clk_recalc,
		};

		static void bus_clk_recalc(struct clk *clk)
		{
		int idx = (ctrl_inw(cprc_base) >> 3) & 0x0007;
		clk->rate = clk->parent->rate / ifc_table[idx];
		}

		static struct clk_ops sh5_bus_clk_ops = {
		.recalc = bus_clk_recalc,
		};

		static void cpu_clk_recalc(struct clk *clk)
		{
		int idx = (ctrl_inw(cprc_base) & 0x0007);
		clk->rate = clk->parent->rate / ifc_table[idx];
		}

		static struct clk_ops sh5_cpu_clk_ops = {
		.recalc = cpu_clk_recalc,
		};

		static struct clk_ops *sh5_clk_ops[] = {
		&sh5_master_clk_ops,
		&sh5_module_clk_ops,
		&sh5_bus_clk_ops,
		&sh5_cpu_clk_ops,
		};

		void __init arch_init_clk_ops(struct clk_ops **ops, int idx)
		{
		cprc_base = onchip_remap(CPRC_BASE, 1024, "CPRC");
		BUG_ON(!cprc_base);

		if (idx < ARRAY_SIZE(sh5_clk_ops))
		*ops = sh5_clk_ops[idx];
		}

arch/sh/kernel/time_64.c

+7 −161

Original line number	Diff line number	Diff line
		@@ -39,6 +39,7 @@
		#include <asm/processor.h>
		#include <asm/uaccess.h>
		#include <asm/delay.h>
		#include <asm/clock.h>

		#define TMU_TOCR_INIT 0x00
		#define TMU0_TCR_INIT 0x0020
		@@ -51,14 +52,6 @@
		#define RTC_RCR1_CIE 0x10 /* Carry Interrupt Enable */
		#define RTC_RCR1 (rtc_base + 0x38)

		/* Clock, Power and Reset Controller */
		#define CPRC_BLOCK_OFF 0x01010000
		#define CPRC_BASE PHYS_PERIPHERAL_BLOCK + CPRC_BLOCK_OFF

		#define FRQCR (cprc_base+0x0)
		#define WTCSR (cprc_base+0x0018)
		#define STBCR (cprc_base+0x0030)

		/* Time Management Unit */
		#define TMU_BLOCK_OFF 0x01020000
		#define TMU_BASE PHYS_PERIPHERAL_BLOCK + TMU_BLOCK_OFF
		@@ -293,103 +286,17 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
		return IRQ_HANDLED;
		}


		static __init unsigned int get_cpu_hz(void)
		{
		unsigned int count;
		unsigned long __dummy;
		unsigned long ctc_val_init, ctc_val;

		/*
		** Regardless the toolchain, force the compiler to use the
		** arbitrary register r3 as a clock tick counter.
		** NOTE: r3 must be in accordance with sh64_rtc_interrupt()
		*/
		register unsigned long long __rtc_irq_flag __asm__ ("r3");

		local_irq_enable();
		do {} while (ctrl_inb(rtc_base) != 0);
		ctrl_outb(RTC_RCR1_CIE, RTC_RCR1); /* Enable carry interrupt */

		/*
		* r3 is arbitrary. CDC does not support "=z".
		*/
		ctc_val_init = 0xffffffff;
		ctc_val = ctc_val_init;

		asm volatile("gettr tr0, %1\n\t"
		"putcon %0, " __CTC "\n\t"
		"and %2, r63, %2\n\t"
		"pta $+4, tr0\n\t"
		"beq/l %2, r63, tr0\n\t"
		"ptabs %1, tr0\n\t"
		"getcon " __CTC ", %0\n\t"
		: "=r"(ctc_val), "=r" (__dummy), "=r" (__rtc_irq_flag)
		: "0" (0));
		local_irq_disable();
		/*
		* SH-3:
		* CPU clock = 4 stages * loop
		* tst rm,rm if id ex
		* bt/s 1b if id ex
		* add #1,rd if id ex
		* (if) pipe line stole
		* tst rm,rm if id ex
		* ....
		*
		*
		* SH-4:
		* CPU clock = 6 stages * loop
		* I don't know why.
		* ....
		*
		* SH-5:
		* Use CTC register to count. This approach returns the right value
		* even if the I-cache is disabled (e.g. whilst debugging.)
		*
		*/

		count = ctc_val_init - ctc_val; /* CTC counts down */

		/*
		* This really is count by the number of clock cycles
		* by the ratio between a complete R64CNT
		* wrap-around (128) and CUI interrupt being raised (64).
		*/
		return count*2;
		}

		static irqreturn_t sh64_rtc_interrupt(int irq, void *dev_id)
		{
		struct pt_regs *regs = get_irq_regs();

		ctrl_outb(0, RTC_RCR1); /* Disable Carry Interrupts */
		regs->regs[3] = 1; /* Using r3 */

		return IRQ_HANDLED;
		}

		static struct irqaction irq0 = {
		.handler = timer_interrupt,
		.flags = IRQF_DISABLED,
		.mask = CPU_MASK_NONE,
		.name = "timer",
		};
		static struct irqaction irq1 = {
		.handler = sh64_rtc_interrupt,
		.flags = IRQF_DISABLED,
		.mask = CPU_MASK_NONE,
		.name = "rtc",
		};

		void __init time_init(void)
		{
		unsigned int cpu_clock, master_clock, bus_clock, module_clock;
		unsigned long interval;
		unsigned long frqcr, ifc, pfc;
		static int ifc_table[] = { 2, 4, 6, 8, 10, 12, 16, 24 };
		#define bfc_table ifc_table /* Same */
		#define pfc_table ifc_table /* Same */
		struct clk *clk;

		tmu_base = onchip_remap(TMU_BASE, 1024, "TMU");
		if (!tmu_base) {
		@@ -401,50 +308,19 @@ void __init time_init(void)
		panic("Unable to remap RTC\n");
		}

		cprc_base = onchip_remap(CPRC_BASE, 1024, "CPRC");
		if (!cprc_base) {
		panic("Unable to remap CPRC\n");
		}
		clk = clk_get(NULL, "cpu_clk");
		scaled_recip_ctc_ticks_per_jiffy = ((1ULL << CTC_JIFFY_SCALE_SHIFT) /
		(unsigned long long)(clk_get_rate(clk) / HZ));

		rtc_sh_get_time(&xtime);

		setup_irq(TIMER_IRQ, &irq0);
		setup_irq(RTC_IRQ, &irq1);

		/* Check how fast it is.. */
		cpu_clock = get_cpu_hz();

		/* Note careful order of operations to maintain reasonable precision and avoid overflow. */
		scaled_recip_ctc_ticks_per_jiffy = ((1ULL << CTC_JIFFY_SCALE_SHIFT) / (unsigned long long)(cpu_clock / HZ));

		free_irq(RTC_IRQ, NULL);

		printk("CPU clock: %d.%02dMHz\n",
		(cpu_clock / 1000000), (cpu_clock % 1000000)/10000);
		{
		unsigned short bfc;
		frqcr = ctrl_inl(FRQCR);
		ifc = ifc_table[(frqcr>> 6) & 0x0007];
		bfc = bfc_table[(frqcr>> 3) & 0x0007];
		pfc = pfc_table[(frqcr>> 12) & 0x0007];
		master_clock = cpu_clock * ifc;
		bus_clock = master_clock/bfc;
		}

		printk("Bus clock: %d.%02dMHz\n",
		(bus_clock/1000000), (bus_clock % 1000000)/10000);
		module_clock = master_clock/pfc;
		printk("Module clock: %d.%02dMHz\n",
		(module_clock/1000000), (module_clock % 1000000)/10000);
		interval = (module_clock/(HZ*4));
		clk = clk_get(NULL, "module_clk");
		interval = (clk_get_rate(clk)/(HZ*4));

		printk("Interval = %ld\n", interval);

		current_cpu_data.cpu_clock = cpu_clock;
		current_cpu_data.master_clock = master_clock;
		current_cpu_data.bus_clock = bus_clock;
		current_cpu_data.module_clock = module_clock;

		/* Start TMU0 */
		ctrl_outb(TMU_TSTR_OFF, TMU_TSTR);
		ctrl_outb(TMU_TOCR_INIT, TMU_TOCR);
		@@ -454,36 +330,6 @@ void __init time_init(void)
		ctrl_outb(TMU_TSTR_INIT, TMU_TSTR);
		}

		void enter_deep_standby(void)
		{
		/* Disable watchdog timer */
		ctrl_outl(0xa5000000, WTCSR);
		/* Configure deep standby on sleep */
		ctrl_outl(0x03, STBCR);

		#ifdef CONFIG_SH_ALPHANUMERIC
		{
		extern void mach_alphanum(int position, unsigned char value);
		extern void mach_alphanum_brightness(int setting);
		char halted[] = "Halted. ";
		int i;
		mach_alphanum_brightness(6); /* dimmest setting above off */
		for (i=0; i<8; i++) {
		mach_alphanum(i, halted[i]);
		}
		asm __volatile__ ("synco");
		}
		#endif

		asm __volatile__ ("sleep");
		asm __volatile__ ("synci");
		asm __volatile__ ("nop");
		asm __volatile__ ("nop");
		asm __volatile__ ("nop");
		asm __volatile__ ("nop");
		panic("Unexpected wakeup!\n");
		}

		static struct resource rtc_resources[] = {
		[0] = {
		/* RTC base, filled in by rtc_init */