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Quite a bit of code gets removed, and some stuff moved around, mostly the old samsung s3c24xx stuff. There should be no functional changes in this series otherwise. Some cleanups have dependencies on other arm-soc branches and will be sent in the second round. Signed-off-by: Arnd Bergmann <arnd@arndb.de> -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) iQIVAwUAT2pCjGCrR//JCVInAQLd8RAAqCxhzSc4ewTUP/974gVhujj3TrpiEQcS FKvYWF76yP38Lbf3CJZBZaONRtrQNOhYpVQ0jb3WCV4F8mEH9PCes2q9RObeBYiY TNX8VdcuVjX2U9HaH0+RQtBUdujNLHpEOqtO57un7T5UDNssR5JOive1tNAooRv1 pL0Hgx3AVqUbNOPpqQqHzy/MDdd67S6dX80yysANjFGMX87Nvp/ztYAdNnIdta+Z pDJt+DPlmK8LvjoSL3SEUN0p3Thk75621cCuauGq88PLIB2w62tzF0NFFbvIAgJT 3aMlHM2flOiTJAWkUvA8zJiUzwv/0vYvH3xPoTo84abve3lVfZcY+fHNcfxE/Gge ri2MmkHyimVP3rNeyM0GbN1RTej1TN1MezeQW3nq2wP6nvS2k0/t32ObLLtWU7XA 6iA0hKVMSnhqj4ln6jPAmyaDkaWHyYz97urhgetHqGadvLTiGPXCSBPalSiFmyMo 11tvuqwUNz9tw4nsvGboFQwS2ZoVquC5inoHp5seqZETkGCB67JyeRGxtAM4gbP/ wIRa3OBLY99yo1on6QovWNnSOMC6X4cOvBI/qHIjSEY/T9JVkslY87gRg3LkxCBR XpXfZ6iuLHoSRUGcIjE8D6KHjMgWIDPRnLkIliK4H+3Jn08g0R1MxCplevFCRtis egswZ8C24Xw= =o5Xl -----END PGP SIGNATURE----- Merge tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc Pull "ARM: global cleanups" from Arnd Bergmann: "Quite a bit of code gets removed, and some stuff moved around, mostly the old samsung s3c24xx stuff. There should be no functional changes in this series otherwise. Some cleanups have dependencies on other arm-soc branches and will be sent in the second round. Signed-off-by: Arnd Bergmann <arnd@arndb.de>" Fixed up trivial conflicts mainly due to #include's being changes on both sides. * tag 'cleanup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (121 commits) ep93xx: Remove unnecessary includes of ep93xx-regs.h ep93xx: Move EP93XX_SYSCON defines to SoC private header ep93xx: Move crunch code to mach-ep93xx directory ep93xx: Make syscon access functions private to SoC ep93xx: Configure GPIO ports in core code ep93xx: Move peripheral defines to local SoC header ep93xx: Convert the watchdog driver into a platform device. ep93xx: Use ioremap for backlight driver ep93xx: Move GPIO defines to gpio-ep93xx.h ep93xx: Don't use system controller defines in audio drivers ep93xx: Move PHYS_BASE defines to local SoC header file ARM: EXYNOS: Add clock register addresses for EXYNOS4X12 bus devfreq driver ARM: EXYNOS: add clock registers for exynos4x12-cpufreq PM / devfreq: update the name of EXYNOS clock registers that were omitted PM / devfreq: update the name of EXYNOS clock register ARM: EXYNOS: change the prefix S5P_ to EXYNOS4_ for clock ARM: EXYNOS: use static declaration on regarding clock ARM: EXYNOS: replace clock.c for other new EXYNOS SoCs ARM: OMAP2+: Fix build error after merge ARM: S3C24XX: remove call to s3c24xx_setup_clocks ...
315 lines
7.8 KiB
C
315 lines
7.8 KiB
C
/*
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* Real Time Clock interface for StrongARM SA1x00 and XScale PXA2xx
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*
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* Copyright (c) 2000 Nils Faerber
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*
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* Based on rtc.c by Paul Gortmaker
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*
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* Original Driver by Nils Faerber <nils@kernelconcepts.de>
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*
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* Modifications from:
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* CIH <cih@coventive.com>
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* Nicolas Pitre <nico@fluxnic.net>
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* Andrew Christian <andrew.christian@hp.com>
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*
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* Converted to the RTC subsystem and Driver Model
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* by Richard Purdie <rpurdie@rpsys.net>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <linux/rtc.h>
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/interrupt.h>
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#include <linux/string.h>
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <mach/hardware.h>
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#include <asm/irq.h>
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#ifdef CONFIG_ARCH_PXA
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#include <mach/regs-rtc.h>
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#endif
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#define RTC_DEF_DIVIDER (32768 - 1)
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#define RTC_DEF_TRIM 0
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static const unsigned long RTC_FREQ = 1024;
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static DEFINE_SPINLOCK(sa1100_rtc_lock);
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static irqreturn_t sa1100_rtc_interrupt(int irq, void *dev_id)
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{
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struct platform_device *pdev = to_platform_device(dev_id);
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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unsigned int rtsr;
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unsigned long events = 0;
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spin_lock(&sa1100_rtc_lock);
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rtsr = RTSR;
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/* clear interrupt sources */
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RTSR = 0;
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/* Fix for a nasty initialization problem the in SA11xx RTSR register.
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* See also the comments in sa1100_rtc_probe(). */
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if (rtsr & (RTSR_ALE | RTSR_HZE)) {
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/* This is the original code, before there was the if test
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* above. This code does not clear interrupts that were not
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* enabled. */
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RTSR = (RTSR_AL | RTSR_HZ) & (rtsr >> 2);
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} else {
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/* For some reason, it is possible to enter this routine
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* without interruptions enabled, it has been tested with
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* several units (Bug in SA11xx chip?).
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*
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* This situation leads to an infinite "loop" of interrupt
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* routine calling and as a result the processor seems to
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* lock on its first call to open(). */
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RTSR = RTSR_AL | RTSR_HZ;
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}
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/* clear alarm interrupt if it has occurred */
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if (rtsr & RTSR_AL)
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rtsr &= ~RTSR_ALE;
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RTSR = rtsr & (RTSR_ALE | RTSR_HZE);
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/* update irq data & counter */
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if (rtsr & RTSR_AL)
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events |= RTC_AF | RTC_IRQF;
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if (rtsr & RTSR_HZ)
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events |= RTC_UF | RTC_IRQF;
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rtc_update_irq(rtc, 1, events);
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spin_unlock(&sa1100_rtc_lock);
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return IRQ_HANDLED;
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}
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static int sa1100_rtc_open(struct device *dev)
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{
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int ret;
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struct platform_device *plat_dev = to_platform_device(dev);
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struct rtc_device *rtc = platform_get_drvdata(plat_dev);
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ret = request_irq(IRQ_RTC1Hz, sa1100_rtc_interrupt, 0, "rtc 1Hz", dev);
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if (ret) {
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dev_err(dev, "IRQ %d already in use.\n", IRQ_RTC1Hz);
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goto fail_ui;
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}
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ret = request_irq(IRQ_RTCAlrm, sa1100_rtc_interrupt, 0,
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"rtc Alrm", dev);
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if (ret) {
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dev_err(dev, "IRQ %d already in use.\n", IRQ_RTCAlrm);
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goto fail_ai;
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}
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rtc->max_user_freq = RTC_FREQ;
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rtc_irq_set_freq(rtc, NULL, RTC_FREQ);
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return 0;
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fail_ai:
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free_irq(IRQ_RTC1Hz, dev);
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fail_ui:
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return ret;
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}
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static void sa1100_rtc_release(struct device *dev)
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{
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spin_lock_irq(&sa1100_rtc_lock);
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RTSR = 0;
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spin_unlock_irq(&sa1100_rtc_lock);
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free_irq(IRQ_RTCAlrm, dev);
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free_irq(IRQ_RTC1Hz, dev);
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}
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static int sa1100_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
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{
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spin_lock_irq(&sa1100_rtc_lock);
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if (enabled)
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RTSR |= RTSR_ALE;
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else
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RTSR &= ~RTSR_ALE;
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spin_unlock_irq(&sa1100_rtc_lock);
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return 0;
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}
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static int sa1100_rtc_read_time(struct device *dev, struct rtc_time *tm)
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{
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rtc_time_to_tm(RCNR, tm);
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return 0;
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}
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static int sa1100_rtc_set_time(struct device *dev, struct rtc_time *tm)
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{
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unsigned long time;
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int ret;
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ret = rtc_tm_to_time(tm, &time);
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if (ret == 0)
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RCNR = time;
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return ret;
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}
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static int sa1100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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u32 rtsr;
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rtsr = RTSR;
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alrm->enabled = (rtsr & RTSR_ALE) ? 1 : 0;
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alrm->pending = (rtsr & RTSR_AL) ? 1 : 0;
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return 0;
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}
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static int sa1100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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{
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unsigned long time;
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int ret;
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spin_lock_irq(&sa1100_rtc_lock);
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ret = rtc_tm_to_time(&alrm->time, &time);
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if (ret != 0)
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goto out;
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RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL);
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RTAR = time;
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if (alrm->enabled)
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RTSR |= RTSR_ALE;
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else
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RTSR &= ~RTSR_ALE;
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out:
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spin_unlock_irq(&sa1100_rtc_lock);
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return ret;
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}
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static int sa1100_rtc_proc(struct device *dev, struct seq_file *seq)
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{
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seq_printf(seq, "trim/divider\t\t: 0x%08x\n", (u32) RTTR);
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seq_printf(seq, "RTSR\t\t\t: 0x%08x\n", (u32)RTSR);
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return 0;
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}
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static const struct rtc_class_ops sa1100_rtc_ops = {
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.open = sa1100_rtc_open,
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.release = sa1100_rtc_release,
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.read_time = sa1100_rtc_read_time,
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.set_time = sa1100_rtc_set_time,
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.read_alarm = sa1100_rtc_read_alarm,
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.set_alarm = sa1100_rtc_set_alarm,
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.proc = sa1100_rtc_proc,
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.alarm_irq_enable = sa1100_rtc_alarm_irq_enable,
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};
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static int sa1100_rtc_probe(struct platform_device *pdev)
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{
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struct rtc_device *rtc;
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/*
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* According to the manual we should be able to let RTTR be zero
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* and then a default diviser for a 32.768KHz clock is used.
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* Apparently this doesn't work, at least for my SA1110 rev 5.
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* If the clock divider is uninitialized then reset it to the
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* default value to get the 1Hz clock.
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*/
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if (RTTR == 0) {
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RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
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dev_warn(&pdev->dev, "warning: "
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"initializing default clock divider/trim value\n");
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/* The current RTC value probably doesn't make sense either */
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RCNR = 0;
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}
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device_init_wakeup(&pdev->dev, 1);
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rtc = rtc_device_register(pdev->name, &pdev->dev, &sa1100_rtc_ops,
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THIS_MODULE);
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if (IS_ERR(rtc))
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return PTR_ERR(rtc);
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platform_set_drvdata(pdev, rtc);
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/* Fix for a nasty initialization problem the in SA11xx RTSR register.
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* See also the comments in sa1100_rtc_interrupt().
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*
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* Sometimes bit 1 of the RTSR (RTSR_HZ) will wake up 1, which means an
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* interrupt pending, even though interrupts were never enabled.
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* In this case, this bit it must be reset before enabling
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* interruptions to avoid a nonexistent interrupt to occur.
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*
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* In principle, the same problem would apply to bit 0, although it has
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* never been observed to happen.
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*
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* This issue is addressed both here and in sa1100_rtc_interrupt().
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* If the issue is not addressed here, in the times when the processor
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* wakes up with the bit set there will be one spurious interrupt.
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*
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* The issue is also dealt with in sa1100_rtc_interrupt() to be on the
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* safe side, once the condition that lead to this strange
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* initialization is unknown and could in principle happen during
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* normal processing.
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*
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* Notice that clearing bit 1 and 0 is accomplished by writting ONES to
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* the corresponding bits in RTSR. */
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RTSR = RTSR_AL | RTSR_HZ;
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return 0;
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}
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static int sa1100_rtc_remove(struct platform_device *pdev)
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{
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struct rtc_device *rtc = platform_get_drvdata(pdev);
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if (rtc)
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rtc_device_unregister(rtc);
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return 0;
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}
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#ifdef CONFIG_PM
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static int sa1100_rtc_suspend(struct device *dev)
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{
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if (device_may_wakeup(dev))
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enable_irq_wake(IRQ_RTCAlrm);
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return 0;
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}
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static int sa1100_rtc_resume(struct device *dev)
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{
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if (device_may_wakeup(dev))
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disable_irq_wake(IRQ_RTCAlrm);
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return 0;
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}
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static const struct dev_pm_ops sa1100_rtc_pm_ops = {
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.suspend = sa1100_rtc_suspend,
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.resume = sa1100_rtc_resume,
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};
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#endif
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static struct platform_driver sa1100_rtc_driver = {
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.probe = sa1100_rtc_probe,
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.remove = sa1100_rtc_remove,
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.driver = {
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.name = "sa1100-rtc",
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#ifdef CONFIG_PM
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.pm = &sa1100_rtc_pm_ops,
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#endif
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},
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};
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module_platform_driver(sa1100_rtc_driver);
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MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
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MODULE_DESCRIPTION("SA11x0/PXA2xx Realtime Clock Driver (RTC)");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:sa1100-rtc");
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