24e44913aa
Pull ARM SoC platform updates from Olof Johansson:
"SoC platform changes. Main theme this merge window:
- The Netx platform (Netx 100/500) platform is removed by Linus
Walleij-- the SoC doesn't have active maintainers with hardware,
and in discussions with the vendor the agreement was that it's OK
to remove.
- Russell King has a series of patches that cleans up and refactors
SA1101 and RiscPC support"
* tag 'armsoc-soc' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc: (47 commits)
ARM: stm32: use "depends on" instead of "if" after prompt
ARM: sa1100: convert to common clock framework
ARM: exynos: Cleanup cppcheck shifting warning
ARM: pxa/lubbock: remove lubbock_set_misc_wr() from global view
ARM: exynos: Only build MCPM support if used
arm: add missing include platform-data/atmel.h
ARM: davinci: Use GPIO lookup table for DA850 LEDs
ARM: OMAP2: drop explicit assembler architecture
ARM: use arch_extension directive instead of arch argument
ARM: imx: Switch imx7d to imx-cpufreq-dt for speed-grading
ARM: bcm: Enable PINCTRL for ARCH_BRCMSTB
ARM: bcm: Enable ARCH_HAS_RESET_CONTROLLER for ARCH_BRCMSTB
ARM: riscpc: enable chained scatterlist support
ARM: riscpc: reduce IRQ handling code
ARM: riscpc: move RiscPC assembly files from arch/arm/lib to mach-rpc
ARM: riscpc: parse video information from tagged list
ARM: riscpc: add ecard quirk for Atomwide 3port serial card
MAINTAINERS: mvebu: Add git entry
soc: ti: pm33xx: Add a print while entering RTC only mode with DDR in self-refresh
ARM: OMAP2+: Make some variables static
...
102 lines
2.3 KiB
C
102 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/arch/arm/common/time-acorn.c
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*
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* Copyright (c) 1996-2000 Russell King.
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*
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* Changelog:
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* 24-Sep-1996 RMK Created
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* 10-Oct-1996 RMK Brought up to date with arch-sa110eval
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* 04-Dec-1997 RMK Updated for new arch/arm/time.c
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* 13=Jun-2004 DS Moved to arch/arm/common b/c shared w/CLPS7500
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*/
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#include <linux/clocksource.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <asm/hardware/ioc.h>
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#include <asm/mach/time.h>
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#define RPC_CLOCK_FREQ 2000000
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#define RPC_LATCH DIV_ROUND_CLOSEST(RPC_CLOCK_FREQ, HZ)
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static u32 ioc_time;
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static u64 ioc_timer_read(struct clocksource *cs)
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{
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unsigned int count1, count2, status;
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unsigned long flags;
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u32 ticks;
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local_irq_save(flags);
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ioc_writeb (0, IOC_T0LATCH);
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barrier ();
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count1 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
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barrier ();
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status = ioc_readb(IOC_IRQREQA);
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barrier ();
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ioc_writeb (0, IOC_T0LATCH);
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barrier ();
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count2 = ioc_readb(IOC_T0CNTL) | (ioc_readb(IOC_T0CNTH) << 8);
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ticks = ioc_time + RPC_LATCH - count2;
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local_irq_restore(flags);
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if (count2 < count1) {
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/*
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* The timer has not reloaded between reading count1 and
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* count2, check whether an interrupt was actually pending.
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*/
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if (status & (1 << 5))
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ticks += RPC_LATCH;
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} else if (count2 > count1) {
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/*
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* The timer has reloaded, so count2 indicates the new
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* count since the wrap. The interrupt would not have
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* been processed, so add the missed ticks.
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*/
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ticks += RPC_LATCH;
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}
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return ticks;
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}
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static struct clocksource ioctime_clocksource = {
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.read = ioc_timer_read,
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.mask = CLOCKSOURCE_MASK(32),
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.rating = 100,
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};
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void __init ioctime_init(void)
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{
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ioc_writeb(RPC_LATCH & 255, IOC_T0LTCHL);
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ioc_writeb(RPC_LATCH >> 8, IOC_T0LTCHH);
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ioc_writeb(0, IOC_T0GO);
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}
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static irqreturn_t
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ioc_timer_interrupt(int irq, void *dev_id)
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{
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ioc_time += RPC_LATCH;
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timer_tick();
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return IRQ_HANDLED;
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}
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static struct irqaction ioc_timer_irq = {
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.name = "timer",
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.handler = ioc_timer_interrupt
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};
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/*
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* Set up timer interrupt.
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*/
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void __init ioc_timer_init(void)
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{
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WARN_ON(clocksource_register_hz(&ioctime_clocksource, RPC_CLOCK_FREQ));
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ioctime_init();
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setup_irq(IRQ_TIMER0, &ioc_timer_irq);
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}
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