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#
# SoC audio configuration
#

menu "System on Chip audio support"
	depends on SND!=n

config SND_SOC_AC97_BUS
	bool

config SND_SOC
	tristate "ALSA for SoC audio support"
	depends on SND
	select SND_PCM
	---help---

	  If you want ASoC support, you should say Y here and also to the
	  specific driver for your SoC platform below.
	  
	  ASoC provides power efficient ALSA support for embedded battery powered
	  SoC based systems like PDA's, Phones and Personal Media Players.

	  This ASoC audio support can also be built as a module.  If so, the module
	  will be called snd-soc-core.

# All the supported Soc's
source "sound/soc/at91/Kconfig"
source "sound/soc/pxa/Kconfig"
source "sound/soc/s3c24xx/Kconfig"
source "sound/soc/sh/Kconfig"
source "sound/soc/fsl/Kconfig"
source "sound/soc/davinci/Kconfig"
source "sound/soc/omap/Kconfig"

# Supported codecs
source "sound/soc/codecs/Kconfig"

endmenu
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/*
 * "RTT as Real Time Clock" driver for AT91SAM9 SoC family
 *
 * (C) 2007 Michel Benoit
 *
 * Based on rtc-at91rm9200.c by Rick Bronson
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/time.h>
#include <linux/rtc.h>
#include <linux/interrupt.h>
#include <linux/ioctl.h>

#include <asm/mach/time.h>
#include <asm/arch/board.h>
#include <asm/arch/at91_rtt.h>


/*
 * This driver uses two configurable hardware resources that live in the
 * AT91SAM9 backup power domain (intended to be powered at all times)
 * to implement the Real Time Clock interfaces
 *
 *  - A "Real-time Timer" (RTT) counts up in seconds from a base time.
 *    We can't assign the counter value (CRTV) ... but we can reset it.
 *
 *  - One of the "General Purpose Backup Registers" (GPBRs) holds the
 *    base time, normally an offset from the beginning of the POSIX
 *    epoch (1970-Jan-1 00:00:00 UTC).  Some systems also include the
 *    local timezone's offset.
 *
 * The RTC's value is the RTT counter plus that offset.  The RTC's alarm
 * is likewise a base (ALMV) plus that offset.
 *
 * Not all RTTs will be used as RTCs; some systems have multiple RTTs to
 * choose from, or a "real" RTC module.  All systems have multiple GPBR
 * registers available, likewise usable for more than "RTC" support.
 */

/*
 * We store ALARM_DISABLED in ALMV to record that no alarm is set.
 * It's also the reset value for that field.
 */
#define ALARM_DISABLED	((u32)~0)


struct sam9_rtc {
	void __iomem		*rtt;
	struct rtc_device	*rtcdev;
	u32			imr;
};

#define rtt_readl(rtc, field) \
	__raw_readl((rtc)->rtt + AT91_RTT_ ## field)
#define rtt_writel(rtc, field, val) \
	__raw_writel((val), (rtc)->rtt + AT91_RTT_ ## field)

#define gpbr_readl(rtc) \
	at91_sys_read(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR)
#define gpbr_writel(rtc, val) \
	at91_sys_write(AT91_GPBR + 4 * CONFIG_RTC_DRV_AT91SAM9_GPBR, (val))

/*
 * Read current time and date in RTC
 */
static int at91_rtc_readtime(struct device *dev, struct rtc_time *tm)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	u32 secs, secs2;
	u32 offset;

	/* read current time offset */
	offset = gpbr_readl(rtc);
	if (offset == 0)
		return -EILSEQ;

	/* reread the counter to help sync the two clock domains */
	secs = rtt_readl(rtc, VR);
	secs2 = rtt_readl(rtc, VR);
	if (secs != secs2)
		secs = rtt_readl(rtc, VR);

	rtc_time_to_tm(offset + secs, tm);

	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readtime",
		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	return 0;
}

/*
 * Set current time and date in RTC
 */
static int at91_rtc_settime(struct device *dev, struct rtc_time *tm)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	int err;
	u32 offset, alarm, mr;
	unsigned long secs;

	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "settime",
		1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
		tm->tm_hour, tm->tm_min, tm->tm_sec);

	err = rtc_tm_to_time(tm, &secs);
	if (err != 0)
		return err;

	mr = rtt_readl(rtc, MR);

	/* disable interrupts */
	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));

	/* read current time offset */
	offset = gpbr_readl(rtc);

	/* store the new base time in a battery backup register */
	secs += 1;
	gpbr_writel(rtc, secs);

	/* adjust the alarm time for the new base */
	alarm = rtt_readl(rtc, AR);
	if (alarm != ALARM_DISABLED) {
		if (offset > secs) {
			/* time jumped backwards, increase time until alarm */
			alarm += (offset - secs);
		} else if ((alarm + offset) > secs) {
			/* time jumped forwards, decrease time until alarm */
			alarm -= (secs - offset);
		} else {
			/* time jumped past the alarm, disable alarm */
			alarm = ALARM_DISABLED;
			mr &= ~AT91_RTT_ALMIEN;
		}
		rtt_writel(rtc, AR, alarm);
	}

	/* reset the timer, and re-enable interrupts */
	rtt_writel(rtc, MR, mr | AT91_RTT_RTTRST);

	return 0;
}

static int at91_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	u32 alarm = rtt_readl(rtc, AR);
	u32 offset;

	offset = gpbr_readl(rtc);
	if (offset == 0)
		return -EILSEQ;

	memset(alrm, 0, sizeof(alrm));
	if (alarm != ALARM_DISABLED && offset != 0) {
		rtc_time_to_tm(offset + alarm, tm);

		dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "readalarm",
			1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
			tm->tm_hour, tm->tm_min, tm->tm_sec);

		if (rtt_readl(rtc, MR) & AT91_RTT_ALMIEN)
			alrm->enabled = 1;
	}

	return 0;
}

static int at91_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	struct rtc_time *tm = &alrm->time;
	unsigned long secs;
	u32 offset;
	u32 mr;
	int err;

	err = rtc_tm_to_time(tm, &secs);
	if (err != 0)
		return err;

	offset = gpbr_readl(rtc);
	if (offset == 0) {
		/* time is not set */
		return -EILSEQ;
	}
	mr = rtt_readl(rtc, MR);
	rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);

	/* alarm in the past? finish and leave disabled */
	if (secs <= offset) {
		rtt_writel(rtc, AR, ALARM_DISABLED);
		return 0;
	}

	/* else set alarm and maybe enable it */
	rtt_writel(rtc, AR, secs - offset);
	if (alrm->enabled)
		rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);

	dev_dbg(dev, "%s: %4d-%02d-%02d %02d:%02d:%02d\n", "setalarm",
		tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour,
		tm->tm_min, tm->tm_sec);

	return 0;
}

/*
 * Handle commands from user-space
 */
static int at91_rtc_ioctl(struct device *dev, unsigned int cmd,
			unsigned long arg)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	int ret = 0;
	u32 mr = rtt_readl(rtc, MR);

	dev_dbg(dev, "ioctl: cmd=%08x, arg=%08lx, mr %08x\n", cmd, arg, mr);

	switch (cmd) {
	case RTC_AIE_OFF:		/* alarm off */
		rtt_writel(rtc, MR, mr & ~AT91_RTT_ALMIEN);
		break;
	case RTC_AIE_ON:		/* alarm on */
		rtt_writel(rtc, MR, mr | AT91_RTT_ALMIEN);
		break;
	case RTC_UIE_OFF:		/* update off */
		rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
		break;
	case RTC_UIE_ON:		/* update on */
		rtt_writel(rtc, MR, mr | AT91_RTT_RTTINCIEN);
		break;
	default:
		ret = -ENOIOCTLCMD;
		break;
	}

	return ret;
}

/*
 * Provide additional RTC information in /proc/driver/rtc
 */
static int at91_rtc_proc(struct device *dev, struct seq_file *seq)
{
	struct sam9_rtc *rtc = dev_get_drvdata(dev);
	u32 mr = mr = rtt_readl(rtc, MR);

	seq_printf(seq, "update_IRQ\t: %s\n",
			(mr & AT91_RTT_RTTINCIEN) ? "yes" : "no");
	return 0;
}

/*
 * IRQ handler for the RTC
 */
static irqreturn_t at91_rtc_interrupt(int irq, void *_rtc)
{
	struct sam9_rtc *rtc = _rtc;
	u32 sr, mr;
	unsigned long events = 0;

	/* Shared interrupt may be for another device.  Note: reading
	 * SR clears it, so we must only read it in this irq handler!
	 */
	mr = rtt_readl(rtc, MR) & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
	sr = rtt_readl(rtc, SR) & (mr >> 16);
	if (!sr)
		return IRQ_NONE;

	/* alarm status */
	if (sr & AT91_RTT_ALMS)
		events |= (RTC_AF | RTC_IRQF);

	/* timer update/increment */
	if (sr & AT91_RTT_RTTINC)
		events |= (RTC_UF | RTC_IRQF);

	rtc_update_irq(rtc->rtcdev, 1, events);

	pr_debug("%s: num=%ld, events=0x%02lx\n", __FUNCTION__,
		events >> 8, events & 0x000000FF);

	return IRQ_HANDLED;
}

static const struct rtc_class_ops at91_rtc_ops = {
	.ioctl		= at91_rtc_ioctl,
	.read_time	= at91_rtc_readtime,
	.set_time	= at91_rtc_settime,
	.read_alarm	= at91_rtc_readalarm,
	.set_alarm	= at91_rtc_setalarm,
	.proc		= at91_rtc_proc,
};

/*
 * Initialize and install RTC driver
 */
static int __init at91_rtc_probe(struct platform_device *pdev)
{
	struct resource	*r;
	struct sam9_rtc	*rtc;
	int		ret;
	u32		mr;

	r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	if (!r)
		return -ENODEV;

	rtc = kzalloc(sizeof *rtc, GFP_KERNEL);
	if (!rtc)
		return -ENOMEM;

	/* platform setup code should have handled this; sigh */
	if (!device_can_wakeup(&pdev->dev))
		device_init_wakeup(&pdev->dev, 1);

	platform_set_drvdata(pdev, rtc);
	rtc->rtt = (void __force __iomem *) (AT91_VA_BASE_SYS - AT91_BASE_SYS);
	rtc->rtt += r->start;

	mr = rtt_readl(rtc, MR);

	/* unless RTT is counting at 1 Hz, re-initialize it */
	if ((mr & AT91_RTT_RTPRES) != AT91_SLOW_CLOCK) {
		mr = AT91_RTT_RTTRST | (AT91_SLOW_CLOCK & AT91_RTT_RTPRES);
		gpbr_writel(rtc, 0);
	}

	/* disable all interrupts (same as on shutdown path) */
	mr &= ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
	rtt_writel(rtc, MR, mr);

	rtc->rtcdev = rtc_device_register(pdev->name, &pdev->dev,
				&at91_rtc_ops, THIS_MODULE);
	if (IS_ERR(rtc->rtcdev)) {
		ret = PTR_ERR(rtc->rtcdev);
		goto fail;
	}

	/* register irq handler after we know what name we'll use */
	ret = request_irq(AT91_ID_SYS, at91_rtc_interrupt,
				IRQF_DISABLED | IRQF_SHARED,
				rtc->rtcdev->dev.bus_id, rtc);
	if (ret) {
		dev_dbg(&pdev->dev, "can't share IRQ %d?\n", AT91_ID_SYS);
		rtc_device_unregister(rtc->rtcdev);
		goto fail;
	}

	/* NOTE:  sam9260 rev A silicon has a ROM bug which resets the
	 * RTT on at least some reboots.  If you have that chip, you must
	 * initialize the time from some external source like a GPS, wall
	 * clock, discrete RTC, etc
	 */

	if (gpbr_readl(rtc) == 0)
		dev_warn(&pdev->dev, "%s: SET TIME!\n",
				rtc->rtcdev->dev.bus_id);

	return 0;

fail:
	platform_set_drvdata(pdev, NULL);
	kfree(rtc);
	return ret;
}

/*
 * Disable and remove the RTC driver
 */
static int __exit at91_rtc_remove(struct platform_device *pdev)
{
	struct sam9_rtc	*rtc = platform_get_drvdata(pdev);
	u32		mr = rtt_readl(rtc, MR);

	/* disable all interrupts */
	rtt_writel(rtc, MR, mr & ~(AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN));
	free_irq(AT91_ID_SYS, rtc);

	rtc_device_unregister(rtc->rtcdev);

	platform_set_drvdata(pdev, NULL);
	kfree(rtc);
	return 0;
}

static void at91_rtc_shutdown(struct platform_device *pdev)
{
	struct sam9_rtc	*rtc = platform_get_drvdata(pdev);
	u32		mr = rtt_readl(rtc, MR);

	rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
	rtt_writel(rtc, MR, mr & ~rtc->imr);
}

#ifdef CONFIG_PM

/* AT91SAM9 RTC Power management control */

static int at91_rtc_suspend(struct platform_device *pdev,
					pm_message_t state)
{
	struct sam9_rtc	*rtc = platform_get_drvdata(pdev);
	u32		mr = rtt_readl(rtc, MR);

	/*
	 * This IRQ is shared with DBGU and other hardware which isn't
	 * necessarily a wakeup event source.
	 */
	rtc->imr = mr & (AT91_RTT_ALMIEN | AT91_RTT_RTTINCIEN);
	if (rtc->imr) {
		if (device_may_wakeup(&pdev->dev) && (mr & AT91_RTT_ALMIEN)) {
			enable_irq_wake(AT91_ID_SYS);
			/* don't let RTTINC cause wakeups */
			if (mr & AT91_RTT_RTTINCIEN)
				rtt_writel(rtc, MR, mr & ~AT91_RTT_RTTINCIEN);
		} else
			rtt_writel(rtc, MR, mr & ~rtc->imr);
	}

	return 0;
}

static int at91_rtc_resume(struct platform_device *pdev)
{
	struct sam9_rtc	*rtc = platform_get_drvdata(pdev);
	u32		mr;

	if (rtc->imr) {
		if (device_may_wakeup(&pdev->dev))
			disable_irq_wake(AT91_ID_SYS);
		mr = rtt_readl(rtc, MR);
		rtt_writel(rtc, MR, mr | rtc->imr);
	}

	return 0;
}
#else
#define at91_rtc_suspend	NULL
#define at91_rtc_resume		NULL
#endif

static struct platform_driver at91_rtc_driver = {
	.driver.name	= "rtc-at91sam9",
	.driver.owner	= THIS_MODULE,
	.remove		= __exit_p(at91_rtc_remove),
	.shutdown	= at91_rtc_shutdown,
	.suspend	= at91_rtc_suspend,
	.resume		= at91_rtc_resume,
};

/* Chips can have more than one RTT module, and they can be used for more
 * than just RTCs.  So we can't just register as "the" RTT driver.
 *
 * A normal approach in such cases is to create a library to allocate and
 * free the modules.  Here we just use bus_find_device() as like such a
 * library, binding directly ... no runtime "library" footprint is needed.
 */
static int __init at91_rtc_match(struct device *dev, void *v)
{
	struct platform_device *pdev = to_platform_device(dev);
	int ret;

	/* continue searching if this isn't the RTT we need */
	if (strcmp("at91_rtt", pdev->name) != 0
			|| pdev->id != CONFIG_RTC_DRV_AT91SAM9_RTT)
		goto fail;

	/* else we found it ... but fail unless we can bind to the RTC driver */
	if (dev->driver) {
		dev_dbg(dev, "busy, can't use as RTC!\n");
		goto fail;
	}
	dev->driver = &at91_rtc_driver.driver;
	if (device_attach(dev) == 0) {
		dev_dbg(dev, "can't attach RTC!\n");
		goto fail;
	}
	ret = at91_rtc_probe(pdev);
	if (ret == 0)
		return true;

	dev_dbg(dev, "RTC probe err %d!\n", ret);
fail:
	return false;
}

static int __init at91_rtc_init(void)
{
	int status;
	struct device *rtc;

	status = platform_driver_register(&at91_rtc_driver);
	if (status)
		return status;
	rtc = bus_find_device(&platform_bus_type, NULL,
			NULL, at91_rtc_match);
	if (!rtc)
		platform_driver_unregister(&at91_rtc_driver);
	return rtc ? 0 : -ENODEV;
}
module_init(at91_rtc_init);

static void __exit at91_rtc_exit(void)
{
	platform_driver_unregister(&at91_rtc_driver);
}
module_exit(at91_rtc_exit);


MODULE_AUTHOR("Michel Benoit");
MODULE_DESCRIPTION("RTC driver for Atmel AT91SAM9x");
MODULE_LICENSE("GPL");
generated by cgit v1.2.2 (git 2.25.0) at 2025-02-14 17:20:58 -0500