Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 588 insertions, 0 deletions

diff --git a/drivers/char/s3c2410-rtc.c b/drivers/char/s3c2410-rtc.c
new file mode 100644
index 000000000000..ec666395a26c
--- /dev/null
+++ b/drivers/char/s3c2410-rtc.c
@@ -0,0 +1,588 @@
+/* drivers/char/s3c2410_rtc.c
+ *
+ * Copyright (c) 2004 Simtec Electronics <linux@simtec.co.uk>
+ *                    http://www.simtec.co.uk/products/SWLINUX/
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * S3C2410 Internal RTC Driver
+ *
+ *  Changelog:
+ *      08-Nov-2004     BJD     Initial creation
+ *      12-Nov-2004     BJD     Added periodic IRQ and PM code
+ *      22-Nov-2004     BJD     Sign-test on alarm code to check for <0
+ *      10-Mar-2005     LCVR    Changed S3C2410_VA_RTC to S3C24XX_VA_RTC
+*/
+
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/string.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/interrupt.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+
+#include <asm/hardware.h>
+#include <asm/uaccess.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/rtc.h>
+
+#include <asm/mach/time.h>
+
+#include <asm/hardware/clock.h>
+#include <asm/arch/regs-rtc.h>
+
+/* need this for the RTC_AF definitions */
+#include <linux/mc146818rtc.h>
+
+#undef S3C24XX_VA_RTC
+#define S3C24XX_VA_RTC s3c2410_rtc_base
+
+static struct resource *s3c2410_rtc_mem;
+
+static void __iomem *s3c2410_rtc_base;
+static int s3c2410_rtc_alarmno = NO_IRQ;
+static int s3c2410_rtc_tickno  = NO_IRQ;
+static int s3c2410_rtc_freq    = 1;
+
+static DEFINE_SPINLOCK(s3c2410_rtc_pie_lock);
+
+/* IRQ Handlers */
+
+static irqreturn_t s3c2410_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
+{
+        rtc_update(1, RTC_AF | RTC_IRQF);
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t s3c2410_rtc_tickirq(int irq, void *id, struct pt_regs *r)
+{
+        rtc_update(1, RTC_PF | RTC_IRQF);
+        return IRQ_HANDLED;
+}
+
+/* Update control registers */
+static void s3c2410_rtc_setaie(int to)
+{
+        unsigned int tmp;
+
+        pr_debug("%s: aie=%d\n", __FUNCTION__, to);
+
+        tmp = readb(S3C2410_RTCALM);
+
+        if (to)
+                tmp |= S3C2410_RTCALM_ALMEN;
+        else
+                tmp &= ~S3C2410_RTCALM_ALMEN;
+
+
+        writeb(tmp, S3C2410_RTCALM);
+}
+
+static void s3c2410_rtc_setpie(int to)
+{
+        unsigned int tmp;
+
+        pr_debug("%s: pie=%d\n", __FUNCTION__, to);
+
+        spin_lock_irq(&s3c2410_rtc_pie_lock);
+        tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
+
+        if (to)
+                tmp |= S3C2410_TICNT_ENABLE;
+
+        writeb(tmp, S3C2410_TICNT);
+        spin_unlock_irq(&s3c2410_rtc_pie_lock);
+}
+
+static void s3c2410_rtc_setfreq(int freq)
+{
+        unsigned int tmp;
+
+        spin_lock_irq(&s3c2410_rtc_pie_lock);
+        tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
+
+        s3c2410_rtc_freq = freq;
+
+        tmp |= (128 / freq)-1;
+
+        writeb(tmp, S3C2410_TICNT);
+        spin_unlock_irq(&s3c2410_rtc_pie_lock);
+}
+
+/* Time read/write */
+
+static void s3c2410_rtc_gettime(struct rtc_time *rtc_tm)
+{
+        unsigned int have_retried = 0;
+
+ retry_get_time:
+        rtc_tm->tm_min  = readb(S3C2410_RTCMIN);
+        rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
+        rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
+        rtc_tm->tm_mon  = readb(S3C2410_RTCMON);
+        rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
+        rtc_tm->tm_sec  = readb(S3C2410_RTCSEC);
+
+        /* the only way to work out wether the system was mid-update
+         * when we read it is to check the second counter, and if it
+         * is zero, then we re-try the entire read
+         */
+
+        if (rtc_tm->tm_sec == 0 && !have_retried) {
+                have_retried = 1;
+                goto retry_get_time;
+        }
+
+        pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n",
+                 rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday,
+                 rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
+
+        BCD_TO_BIN(rtc_tm->tm_sec);
+        BCD_TO_BIN(rtc_tm->tm_min);
+        BCD_TO_BIN(rtc_tm->tm_hour);
+        BCD_TO_BIN(rtc_tm->tm_mday);
+        BCD_TO_BIN(rtc_tm->tm_mon);
+        BCD_TO_BIN(rtc_tm->tm_year);
+
+        rtc_tm->tm_year += 100;
+        rtc_tm->tm_mon -= 1;
+}
+
+
+static int s3c2410_rtc_settime(struct rtc_time *tm)
+{
+        /* the rtc gets round the y2k problem by just not supporting it */
+
+        if (tm->tm_year < 100)
+                return -EINVAL;
+
+        writeb(BIN2BCD(tm->tm_sec),  S3C2410_RTCSEC);
+        writeb(BIN2BCD(tm->tm_min),  S3C2410_RTCMIN);
+        writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
+        writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
+        writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
+        writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
+
+        return 0;
+}
+
+static void s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm)
+{
+        struct rtc_time *alm_tm = &alrm->time;
+        unsigned int alm_en;
+
+        alm_tm->tm_sec  = readb(S3C2410_ALMSEC);
+        alm_tm->tm_min  = readb(S3C2410_ALMMIN);
+        alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
+        alm_tm->tm_mon  = readb(S3C2410_ALMMON);
+        alm_tm->tm_mday = readb(S3C2410_ALMDATE);
+        alm_tm->tm_year = readb(S3C2410_ALMYEAR);
+
+        alm_en = readb(S3C2410_RTCALM);
+
+        pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n",
+                 alm_en,
+                 alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday,
+                 alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
+
+
+        /* decode the alarm enable field */
+
+        if (alm_en & S3C2410_RTCALM_SECEN) {
+                BCD_TO_BIN(alm_tm->tm_sec);
+        } else {
+                alm_tm->tm_sec = 0xff;
+        }
+
+        if (alm_en & S3C2410_RTCALM_MINEN) {
+                BCD_TO_BIN(alm_tm->tm_min);
+        } else {
+                alm_tm->tm_min = 0xff;
+        }
+
+        if (alm_en & S3C2410_RTCALM_HOUREN) {
+                BCD_TO_BIN(alm_tm->tm_hour);
+        } else {
+                alm_tm->tm_hour = 0xff;
+        }
+
+        if (alm_en & S3C2410_RTCALM_DAYEN) {
+                BCD_TO_BIN(alm_tm->tm_mday);
+        } else {
+                alm_tm->tm_mday = 0xff;
+        }
+
+        if (alm_en & S3C2410_RTCALM_MONEN) {
+                BCD_TO_BIN(alm_tm->tm_mon);
+                alm_tm->tm_mon -= 1;
+        } else {
+                alm_tm->tm_mon = 0xff;
+        }
+
+        if (alm_en & S3C2410_RTCALM_YEAREN) {
+                BCD_TO_BIN(alm_tm->tm_year);
+        } else {
+                alm_tm->tm_year = 0xffff;
+        }
+
+        /* todo - set alrm->enabled ? */
+}
+
+static int s3c2410_rtc_setalarm(struct rtc_wkalrm *alrm)
+{
+        struct rtc_time *tm = &alrm->time;
+        unsigned int alrm_en;
+
+        pr_debug("s3c2410_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n",
+                 alrm->enabled,
+                 tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff,
+                 tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
+
+        if (alrm->enabled || 1) {
+                alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
+                writeb(0x00, S3C2410_RTCALM);
+
+                if (tm->tm_sec < 60 && tm->tm_sec >= 0) {
+                        alrm_en |= S3C2410_RTCALM_SECEN;
+                        writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC);
+                }
+
+                if (tm->tm_min < 60 && tm->tm_min >= 0) {
+                        alrm_en |= S3C2410_RTCALM_MINEN;
+                        writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN);
+                }
+
+                if (tm->tm_hour < 24 && tm->tm_hour >= 0) {
+                        alrm_en |= S3C2410_RTCALM_HOUREN;
+                        writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR);
+                }
+
+                pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
+
+                writeb(alrm_en, S3C2410_RTCALM);
+                enable_irq_wake(s3c2410_rtc_alarmno);
+        } else {
+                alrm_en = readb(S3C2410_RTCALM);
+                alrm_en &= ~S3C2410_RTCALM_ALMEN;
+                writeb(alrm_en, S3C2410_RTCALM);
+                disable_irq_wake(s3c2410_rtc_alarmno);
+        }
+
+        return 0;
+}
+
+static int s3c2410_rtc_ioctl(unsigned int cmd, unsigned long arg)
+{
+        switch (cmd) {
+        case RTC_AIE_OFF:
+        case RTC_AIE_ON:
+                s3c2410_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
+                return 0;
+
+        case RTC_PIE_OFF:
+        case RTC_PIE_ON:
+                s3c2410_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
+                return 0;
+
+        case RTC_IRQP_READ:
+                return put_user(s3c2410_rtc_freq, (unsigned long __user *)arg);
+
+        case RTC_IRQP_SET:
+                if (arg < 1 || arg > 64)
+                        return -EINVAL;
+
+                if (!capable(CAP_SYS_RESOURCE))
+                        return -EACCES;
+
+                /* check for power of 2 */
+
+                if ((arg & (arg-1)) != 0)
+                        return -EINVAL;
+
+                pr_debug("s3c2410_rtc: setting frequency %ld\n", arg);
+
+                s3c2410_rtc_setfreq(arg);
+                return 0;
+
+        case RTC_UIE_ON:
+        case RTC_UIE_OFF:
+                return -EINVAL;
+        }
+
+        return -EINVAL;
+}
+
+static int s3c2410_rtc_proc(char *buf)
+{
+        unsigned int rtcalm = readb(S3C2410_RTCALM);
+        unsigned int ticnt = readb (S3C2410_TICNT);
+        char *p = buf;
+
+        p += sprintf(p, "alarm_IRQ\t: %s\n",
+                     (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
+        p += sprintf(p, "periodic_IRQ\t: %s\n",
+                     (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
+        p += sprintf(p, "periodic_freq\t: %d\n", s3c2410_rtc_freq);
+
+        return p - buf;
+}
+
+static int s3c2410_rtc_open(void)
+{
+        int ret;
+
+        ret = request_irq(s3c2410_rtc_alarmno, s3c2410_rtc_alarmirq,
+                          SA_INTERRUPT,  "s3c2410-rtc alarm", NULL);
+
+        if (ret)
+                printk(KERN_ERR "IRQ%d already in use\n", s3c2410_rtc_alarmno);
+
+        ret = request_irq(s3c2410_rtc_tickno, s3c2410_rtc_tickirq,
+                          SA_INTERRUPT,  "s3c2410-rtc tick", NULL);
+
+        if (ret) {
+                printk(KERN_ERR "IRQ%d already in use\n", s3c2410_rtc_tickno);
+                goto tick_err;
+        }
+
+        return ret;
+
+ tick_err:
+        free_irq(s3c2410_rtc_alarmno, NULL);
+        return ret;
+}
+
+static void s3c2410_rtc_release(void)
+{
+        /* do not clear AIE here, it may be needed for wake */
+
+        s3c2410_rtc_setpie(0);
+        free_irq(s3c2410_rtc_alarmno, NULL);
+        free_irq(s3c2410_rtc_tickno, NULL);
+}
+
+static struct rtc_ops s3c2410_rtcops = {
+        .owner          = THIS_MODULE,
+        .open           = s3c2410_rtc_open,
+        .release        = s3c2410_rtc_release,
+        .ioctl          = s3c2410_rtc_ioctl,
+        .read_time      = s3c2410_rtc_gettime,
+        .set_time       = s3c2410_rtc_settime,
+        .read_alarm     = s3c2410_rtc_getalarm,
+        .set_alarm      = s3c2410_rtc_setalarm,
+        .proc           = s3c2410_rtc_proc,
+};
+
+static void s3c2410_rtc_enable(struct device *dev, int en)
+{
+        unsigned int tmp;
+
+        if (s3c2410_rtc_base == NULL)
+                return;
+
+        if (!en) {
+                tmp = readb(S3C2410_RTCCON);
+                writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
+
+                tmp = readb(S3C2410_TICNT);
+                writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT);
+        } else {
+                /* re-enable the device, and check it is ok */
+
+                if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0){
+                        dev_info(dev, "rtc disabled, re-enabling\n");
+
+                        tmp = readb(S3C2410_RTCCON);
+                        writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON);
+                }
+
+                if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL)){
+                        dev_info(dev, "removing S3C2410_RTCCON_CNTSEL\n");
+
+                        tmp = readb(S3C2410_RTCCON);
+                        writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON);
+                }
+
+                if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST)){
+                        dev_info(dev, "removing S3C2410_RTCCON_CLKRST\n");
+
+                        tmp = readb(S3C2410_RTCCON);
+                        writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
+                }
+        }
+}
+
+static int s3c2410_rtc_remove(struct device *dev)
+{
+        unregister_rtc(&s3c2410_rtcops);
+
+        s3c2410_rtc_setpie(0);
+        s3c2410_rtc_setaie(0);
+
+        if (s3c2410_rtc_mem != NULL) {
+                pr_debug("s3c2410_rtc: releasing s3c2410_rtc_mem\n");
+                iounmap(s3c2410_rtc_base);
+                release_resource(s3c2410_rtc_mem);
+                kfree(s3c2410_rtc_mem);
+        }
+
+        return 0;
+}
+
+static int s3c2410_rtc_probe(struct device *dev)
+{
+        struct platform_device *pdev = to_platform_device(dev);
+        struct resource *res;
+        int ret;
+
+        pr_debug("%s: probe=%p, device=%p\n", __FUNCTION__, pdev, dev);
+
+        /* find the IRQs */
+
+        s3c2410_rtc_tickno = platform_get_irq(pdev, 1);
+        if (s3c2410_rtc_tickno <= 0) {
+                dev_err(dev, "no irq for rtc tick\n");
+                return -ENOENT;
+        }
+
+        s3c2410_rtc_alarmno = platform_get_irq(pdev, 0);
+        if (s3c2410_rtc_alarmno <= 0) {
+                dev_err(dev, "no irq for alarm\n");
+                return -ENOENT;
+        }
+
+        pr_debug("s3c2410_rtc: tick irq %d, alarm irq %d\n",
+                 s3c2410_rtc_tickno, s3c2410_rtc_alarmno);
+
+        /* get the memory region */
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (res == NULL) {
+                dev_err(dev, "failed to get memory region resource\n");
+                return -ENOENT;
+        }
+
+        s3c2410_rtc_mem = request_mem_region(res->start, res->end-res->start+1,
+                                     pdev->name);
+
+        if (s3c2410_rtc_mem == NULL) {
+                dev_err(dev, "failed to reserve memory region\n");
+                ret = -ENOENT;
+                goto exit_err;
+        }
+
+        s3c2410_rtc_base = ioremap(res->start, res->end - res->start + 1);
+        if (s3c2410_rtc_base == NULL) {
+                dev_err(dev, "failed ioremap()\n");
+                ret = -EINVAL;
+                goto exit_err;
+        }
+
+        s3c2410_rtc_mem = res;
+        pr_debug("s3c2410_rtc_base=%p\n", s3c2410_rtc_base);
+
+        pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
+
+        /* check to see if everything is setup correctly */
+
+        s3c2410_rtc_enable(dev, 1);
+
+        pr_debug("s3c2410_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
+
+        s3c2410_rtc_setfreq(s3c2410_rtc_freq);
+
+        /* register RTC and exit */
+
+        register_rtc(&s3c2410_rtcops);
+        return 0;
+
+ exit_err:
+        dev_err(dev, "error %d during initialisation\n", ret);
+
+        return ret;
+}
+
+#ifdef CONFIG_PM
+
+/* S3C2410 RTC Power management control */
+
+static struct timespec s3c2410_rtc_delta;
+
+static int ticnt_save;
+
+static int s3c2410_rtc_suspend(struct device *dev, u32 state, u32 level)
+{
+        struct rtc_time tm;
+        struct timespec time;
+
+        time.tv_nsec = 0;
+
+        if (level == SUSPEND_POWER_DOWN) {
+                /* save TICNT for anyone using periodic interrupts */
+
+                ticnt_save = readb(S3C2410_TICNT);
+
+                /* calculate time delta for suspend */
+
+                s3c2410_rtc_gettime(&tm);
+                rtc_tm_to_time(&tm, &time.tv_sec);
+                save_time_delta(&s3c2410_rtc_delta, &time);
+                s3c2410_rtc_enable(dev, 0);
+        }
+
+        return 0;
+}
+
+static int s3c2410_rtc_resume(struct device *dev, u32 level)
+{
+        struct rtc_time tm;
+        struct timespec time;
+
+        time.tv_nsec = 0;
+
+        s3c2410_rtc_enable(dev, 1);
+        s3c2410_rtc_gettime(&tm);
+        rtc_tm_to_time(&tm, &time.tv_sec);
+        restore_time_delta(&s3c2410_rtc_delta, &time);
+
+        writeb(ticnt_save, S3C2410_TICNT);
+        return 0;
+}
+#else
+#define s3c2410_rtc_suspend NULL
+#define s3c2410_rtc_resume  NULL
+#endif
+
+static struct device_driver s3c2410_rtcdrv = {
+        .name           = "s3c2410-rtc",
+        .bus            = &platform_bus_type,
+        .probe          = s3c2410_rtc_probe,
+        .remove         = s3c2410_rtc_remove,
+        .suspend        = s3c2410_rtc_suspend,
+        .resume         = s3c2410_rtc_resume,
+};
+
+static char __initdata banner[] = "S3C2410 RTC, (c) 2004 Simtec Electronics\n";
+
+static int __init s3c2410_rtc_init(void)
+{
+        printk(banner);
+        return driver_register(&s3c2410_rtcdrv);
+}
+
+static void __exit s3c2410_rtc_exit(void)
+{
+        driver_unregister(&s3c2410_rtcdrv);
+}
+
+module_init(s3c2410_rtc_init);
+module_exit(s3c2410_rtc_exit);
+
+MODULE_DESCRIPTION("S3C24XX RTC Driver");
+MODULE_AUTHOR("Ben Dooks, <ben@simtec.co.uk>");
+MODULE_LICENSE("GPL");