1 files changed, 493 insertions, 0 deletions

diff --git a/drivers/rtc/rtc-pxa.c b/drivers/rtc/rtc-pxa.c
new file mode 100644
index 000000000000..074f356fd049
--- /dev/null
+++ b/drivers/rtc/rtc-pxa.c
@@ -0,0 +1,493 @@
+/*
+ * Real Time Clock interface for XScale PXA27x and PXA3xx
+ *
+ * Copyright (C) 2008 Robert Jarzmik
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <linux/seq_file.h>
+#include <linux/interrupt.h>
+
+#include <asm/io.h>
+
+#define TIMER_FREQ              CLOCK_TICK_RATE
+#define RTC_DEF_DIVIDER         (32768 - 1)
+#define RTC_DEF_TRIM            0
+#define MAXFREQ_PERIODIC        1000
+
+/*
+ * PXA Registers and bits definitions
+ */
+#define RTSR_PICE       (1 << 15)       /* Periodic interrupt count enable */
+#define RTSR_PIALE      (1 << 14)       /* Periodic interrupt Alarm enable */
+#define RTSR_PIAL       (1 << 13)       /* Periodic interrupt detected */
+#define RTSR_SWALE2     (1 << 11)       /* RTC stopwatch alarm2 enable */
+#define RTSR_SWAL2      (1 << 10)       /* RTC stopwatch alarm2 detected */
+#define RTSR_SWALE1     (1 << 9)        /* RTC stopwatch alarm1 enable */
+#define RTSR_SWAL1      (1 << 8)        /* RTC stopwatch alarm1 detected */
+#define RTSR_RDALE2     (1 << 7)        /* RTC alarm2 enable */
+#define RTSR_RDAL2      (1 << 6)        /* RTC alarm2 detected */
+#define RTSR_RDALE1     (1 << 5)        /* RTC alarm1 enable */
+#define RTSR_RDAL1      (1 << 4)        /* RTC alarm1 detected */
+#define RTSR_HZE        (1 << 3)        /* HZ interrupt enable */
+#define RTSR_ALE        (1 << 2)        /* RTC alarm interrupt enable */
+#define RTSR_HZ         (1 << 1)        /* HZ rising-edge detected */
+#define RTSR_AL         (1 << 0)        /* RTC alarm detected */
+#define RTSR_TRIG_MASK  (RTSR_AL | RTSR_HZ | RTSR_RDAL1 | RTSR_RDAL2\
+                         | RTSR_SWAL1 | RTSR_SWAL2)
+#define RYxR_YEAR_S     9
+#define RYxR_YEAR_MASK  (0xfff << RYxR_YEAR_S)
+#define RYxR_MONTH_S    5
+#define RYxR_MONTH_MASK (0xf << RYxR_MONTH_S)
+#define RYxR_DAY_MASK   0x1f
+#define RDxR_HOUR_S     12
+#define RDxR_HOUR_MASK  (0x1f << RDxR_HOUR_S)
+#define RDxR_MIN_S      6
+#define RDxR_MIN_MASK   (0x3f << RDxR_MIN_S)
+#define RDxR_SEC_MASK   0x3f
+
+#define RTSR            0x08
+#define RTTR            0x0c
+#define RDCR            0x10
+#define RYCR            0x14
+#define RDAR1           0x18
+#define RYAR1           0x1c
+#define RTCPICR         0x34
+#define PIAR            0x38
+
+#define rtc_readl(pxa_rtc, reg) \
+        __raw_readl((pxa_rtc)->base + (reg))
+#define rtc_writel(pxa_rtc, reg, value) \
+        __raw_writel((value), (pxa_rtc)->base + (reg))
+
+struct pxa_rtc {
+        struct resource *ress;
+        void __iomem            *base;
+        int                     irq_1Hz;
+        int                     irq_Alrm;
+        struct rtc_device       *rtc;
+        spinlock_t              lock;           /* Protects this structure */
+        struct rtc_time         rtc_alarm;
+};
+
+static u32 ryxr_calc(struct rtc_time *tm)
+{
+        return ((tm->tm_year + 1900) << RYxR_YEAR_S)
+                | ((tm->tm_mon + 1) << RYxR_MONTH_S)
+                | tm->tm_mday;
+}
+
+static u32 rdxr_calc(struct rtc_time *tm)
+{
+        return (tm->tm_hour << RDxR_HOUR_S) | (tm->tm_min << RDxR_MIN_S)
+                | tm->tm_sec;
+}
+
+static void tm_calc(u32 rycr, u32 rdcr, struct rtc_time *tm)
+{
+        tm->tm_year = ((rycr & RYxR_YEAR_MASK) >> RYxR_YEAR_S) - 1900;
+        tm->tm_mon = (((rycr & RYxR_MONTH_MASK) >> RYxR_MONTH_S)) - 1;
+        tm->tm_mday = (rycr & RYxR_DAY_MASK);
+        tm->tm_hour = (rdcr & RDxR_HOUR_MASK) >> RDxR_HOUR_S;
+        tm->tm_min = (rdcr & RDxR_MIN_MASK) >> RDxR_MIN_S;
+        tm->tm_sec = rdcr & RDxR_SEC_MASK;
+}
+
+static void rtsr_clear_bits(struct pxa_rtc *pxa_rtc, u32 mask)
+{
+        u32 rtsr;
+
+        rtsr = rtc_readl(pxa_rtc, RTSR);
+        rtsr &= ~RTSR_TRIG_MASK;
+        rtsr &= ~mask;
+        rtc_writel(pxa_rtc, RTSR, rtsr);
+}
+
+static void rtsr_set_bits(struct pxa_rtc *pxa_rtc, u32 mask)
+{
+        u32 rtsr;
+
+        rtsr = rtc_readl(pxa_rtc, RTSR);
+        rtsr &= ~RTSR_TRIG_MASK;
+        rtsr |= mask;
+        rtc_writel(pxa_rtc, RTSR, rtsr);
+}
+
+static irqreturn_t pxa_rtc_irq(int irq, void *dev_id)
+{
+        struct platform_device *pdev = to_platform_device(dev_id);
+        struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
+        u32 rtsr;
+        unsigned long events = 0;
+
+        spin_lock(&pxa_rtc->lock);
+
+        /* clear interrupt sources */
+        rtsr = rtc_readl(pxa_rtc, RTSR);
+        rtc_writel(pxa_rtc, RTSR, rtsr);
+
+        /* temporary disable rtc interrupts */
+        rtsr_clear_bits(pxa_rtc, RTSR_RDALE1 | RTSR_PIALE | RTSR_HZE);
+
+        /* clear alarm interrupt if it has occurred */
+        if (rtsr & RTSR_RDAL1)
+                rtsr &= ~RTSR_RDALE1;
+
+        /* update irq data & counter */
+        if (rtsr & RTSR_RDAL1)
+                events |= RTC_AF | RTC_IRQF;
+        if (rtsr & RTSR_HZ)
+                events |= RTC_UF | RTC_IRQF;
+        if (rtsr & RTSR_PIAL)
+                events |= RTC_PF | RTC_IRQF;
+
+        rtc_update_irq(pxa_rtc->rtc, 1, events);
+
+        /* enable back rtc interrupts */
+        rtc_writel(pxa_rtc, RTSR, rtsr & ~RTSR_TRIG_MASK);
+
+        spin_unlock(&pxa_rtc->lock);
+        return IRQ_HANDLED;
+}
+
+static int pxa_rtc_open(struct device *dev)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        int ret;
+
+        ret = request_irq(pxa_rtc->irq_1Hz, pxa_rtc_irq, IRQF_DISABLED,
+                          "rtc 1Hz", dev);
+        if (ret < 0) {
+                dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_1Hz,
+                        ret);
+                goto err_irq_1Hz;
+        }
+        ret = request_irq(pxa_rtc->irq_Alrm, pxa_rtc_irq, IRQF_DISABLED,
+                          "rtc Alrm", dev);
+        if (ret < 0) {
+                dev_err(dev, "can't get irq %i, err %d\n", pxa_rtc->irq_Alrm,
+                        ret);
+                goto err_irq_Alrm;
+        }
+
+        return 0;
+
+err_irq_Alrm:
+        free_irq(pxa_rtc->irq_1Hz, dev);
+err_irq_1Hz:
+        return ret;
+}
+
+static void pxa_rtc_release(struct device *dev)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+
+        spin_lock_irq(&pxa_rtc->lock);
+        rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);
+        spin_unlock_irq(&pxa_rtc->lock);
+
+        free_irq(pxa_rtc->irq_Alrm, dev);
+        free_irq(pxa_rtc->irq_1Hz, dev);
+}
+
+static int pxa_periodic_irq_set_freq(struct device *dev, int freq)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        int period_ms;
+
+        if (freq < 1 || freq > MAXFREQ_PERIODIC)
+                return -EINVAL;
+
+        period_ms = 1000 / freq;
+        rtc_writel(pxa_rtc, PIAR, period_ms);
+
+        return 0;
+}
+
+static int pxa_periodic_irq_set_state(struct device *dev, int enabled)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+
+        if (enabled)
+                rtsr_set_bits(pxa_rtc, RTSR_PIALE | RTSR_PICE);
+        else
+                rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_PICE);
+
+        return 0;
+}
+
+static int pxa_rtc_ioctl(struct device *dev, unsigned int cmd,
+                unsigned long arg)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        int ret = 0;
+
+        spin_lock_irq(&pxa_rtc->lock);
+        switch (cmd) {
+        case RTC_AIE_OFF:
+                rtsr_clear_bits(pxa_rtc, RTSR_RDALE1);
+                break;
+        case RTC_AIE_ON:
+                rtsr_set_bits(pxa_rtc, RTSR_RDALE1);
+                break;
+        case RTC_UIE_OFF:
+                rtsr_clear_bits(pxa_rtc, RTSR_HZE);
+                break;
+        case RTC_UIE_ON:
+                rtsr_set_bits(pxa_rtc, RTSR_HZE);
+                break;
+        default:
+                ret = -ENOIOCTLCMD;
+        }
+
+        spin_unlock_irq(&pxa_rtc->lock);
+        return ret;
+}
+
+static int pxa_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        u32 rycr, rdcr;
+
+        rycr = rtc_readl(pxa_rtc, RYCR);
+        rdcr = rtc_readl(pxa_rtc, RDCR);
+
+        tm_calc(rycr, rdcr, tm);
+        return 0;
+}
+
+static int pxa_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+
+        rtc_writel(pxa_rtc, RYCR, ryxr_calc(tm));
+        rtc_writel(pxa_rtc, RDCR, rdxr_calc(tm));
+
+        return 0;
+}
+
+static int pxa_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        u32 rtsr, ryar, rdar;
+
+        ryar = rtc_readl(pxa_rtc, RYAR1);
+        rdar = rtc_readl(pxa_rtc, RDAR1);
+        tm_calc(ryar, rdar, &alrm->time);
+
+        rtsr = rtc_readl(pxa_rtc, RTSR);
+        alrm->enabled = (rtsr & RTSR_RDALE1) ? 1 : 0;
+        alrm->pending = (rtsr & RTSR_RDAL1) ? 1 : 0;
+        return 0;
+}
+
+static int pxa_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+        u32 rtsr;
+
+        spin_lock_irq(&pxa_rtc->lock);
+
+        rtc_writel(pxa_rtc, RYAR1, ryxr_calc(&alrm->time));
+        rtc_writel(pxa_rtc, RDAR1, rdxr_calc(&alrm->time));
+
+        rtsr = rtc_readl(pxa_rtc, RTSR);
+        if (alrm->enabled)
+                rtsr |= RTSR_RDALE1;
+        else
+                rtsr &= ~RTSR_RDALE1;
+        rtc_writel(pxa_rtc, RTSR, rtsr);
+
+        spin_unlock_irq(&pxa_rtc->lock);
+
+        return 0;
+}
+
+static int pxa_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+        struct pxa_rtc *pxa_rtc = dev_get_drvdata(dev);
+
+        seq_printf(seq, "trim/divider\t: 0x%08x\n", rtc_readl(pxa_rtc, RTTR));
+        seq_printf(seq, "update_IRQ\t: %s\n",
+                   (rtc_readl(pxa_rtc, RTSR) & RTSR_HZE) ? "yes" : "no");
+        seq_printf(seq, "periodic_IRQ\t: %s\n",
+                   (rtc_readl(pxa_rtc, RTSR) & RTSR_PIALE) ? "yes" : "no");
+        seq_printf(seq, "periodic_freq\t: %u\n", rtc_readl(pxa_rtc, PIAR));
+
+        return 0;
+}
+
+static const struct rtc_class_ops pxa_rtc_ops = {
+        .open = pxa_rtc_open,
+        .release = pxa_rtc_release,
+        .ioctl = pxa_rtc_ioctl,
+        .read_time = pxa_rtc_read_time,
+        .set_time = pxa_rtc_set_time,
+        .read_alarm = pxa_rtc_read_alarm,
+        .set_alarm = pxa_rtc_set_alarm,
+        .proc = pxa_rtc_proc,
+        .irq_set_state = pxa_periodic_irq_set_state,
+        .irq_set_freq = pxa_periodic_irq_set_freq,
+};
+
+static int __devinit pxa_rtc_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct pxa_rtc *pxa_rtc;
+        int ret;
+        u32 rttr;
+
+        ret = -ENOMEM;
+        pxa_rtc = kzalloc(sizeof(struct pxa_rtc), GFP_KERNEL);
+        if (!pxa_rtc)
+                goto err_alloc;
+
+        ret = -ENXIO;
+        pxa_rtc->ress = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+        if (!pxa_rtc->ress) {
+                dev_err(dev, "No I/O memory resource defined\n");
+                goto err_ress;
+        }
+
+        pxa_rtc->irq_1Hz = platform_get_irq(pdev, 0);
+        if (pxa_rtc->irq_1Hz < 0) {
+                dev_err(dev, "No 1Hz IRQ resource defined\n");
+                goto err_ress;
+        }
+        pxa_rtc->irq_Alrm = platform_get_irq(pdev, 1);
+        if (pxa_rtc->irq_Alrm < 0) {
+                dev_err(dev, "No alarm IRQ resource defined\n");
+                goto err_ress;
+        }
+
+        pxa_rtc->rtc = rtc_device_register(pdev->name, &pdev->dev, &pxa_rtc_ops,
+                                           THIS_MODULE);
+        ret = PTR_ERR(pxa_rtc->rtc);
+        if (IS_ERR(pxa_rtc->rtc)) {
+                dev_err(dev, "Failed to register RTC device -> %d\n", ret);
+                goto err_rtc_reg;
+        }
+
+        spin_lock_init(&pxa_rtc->lock);
+        platform_set_drvdata(pdev, pxa_rtc);
+
+        ret = -ENOMEM;
+        pxa_rtc->base = ioremap(pxa_rtc->ress->start,
+                                pxa_rtc->ress->end - pxa_rtc->ress->start + 1);
+        if (!pxa_rtc->base) {
+                dev_err(&pdev->dev, "Unable to map pxa RTC I/O memory\n");
+                goto err_map;
+        }
+
+        /*
+         * If the clock divider is uninitialized then reset it to the
+         * default value to get the 1Hz clock.
+         */
+        if (rtc_readl(pxa_rtc, RTTR) == 0) {
+                rttr = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
+                rtc_writel(pxa_rtc, RTTR, rttr);
+                dev_warn(dev, "warning: initializing default clock"
+                         " divider/trim value\n");
+        }
+
+        rtsr_clear_bits(pxa_rtc, RTSR_PIALE | RTSR_RDALE1 | RTSR_HZE);
+        device_init_wakeup(dev, 1);
+
+        return 0;
+
+err_map:
+        platform_set_drvdata(pdev, NULL);
+        rtc_device_unregister(pxa_rtc->rtc);
+err_rtc_reg:
+err_ress:
+        kfree(pxa_rtc);
+err_alloc:
+        return ret;
+}
+
+static int __devexit pxa_rtc_remove(struct platform_device *pdev)
+{
+        struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
+
+        spin_lock_irq(&pxa_rtc->lock);
+        iounmap(pxa_rtc->base);
+        pxa_rtc->base = NULL;
+        platform_set_drvdata(pdev, NULL);
+        spin_unlock_irq(&pxa_rtc->lock);
+
+        rtc_device_unregister(pxa_rtc->rtc);
+        kfree(pxa_rtc);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int pxa_rtc_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(&pdev->dev))
+                enable_irq_wake(pxa_rtc->irq_Alrm);
+        return 0;
+}
+
+static int pxa_rtc_resume(struct platform_device *pdev)
+{
+        struct pxa_rtc *pxa_rtc = platform_get_drvdata(pdev);
+
+        if (device_may_wakeup(&pdev->dev))
+                disable_irq_wake(pxa_rtc->irq_Alrm);
+        return 0;
+}
+#else
+#define pxa_rtc_suspend NULL
+#define pxa_rtc_resume  NULL
+#endif
+
+static struct platform_driver pxa_rtc_driver = {
+        .probe          = pxa_rtc_probe,
+        .remove         = __exit_p(pxa_rtc_remove),
+        .suspend        = pxa_rtc_suspend,
+        .resume         = pxa_rtc_resume,
+        .driver         = {
+                .name           = "pxa-rtc",
+        },
+};
+
+static int __init pxa_rtc_init(void)
+{
+        if (cpu_is_pxa27x() || cpu_is_pxa3xx())
+                return platform_driver_register(&pxa_rtc_driver);
+
+        return -ENODEV;
+}
+
+static void __exit pxa_rtc_exit(void)
+{
+        platform_driver_unregister(&pxa_rtc_driver);
+}
+
+module_init(pxa_rtc_init);
+module_exit(pxa_rtc_exit);
+
+MODULE_AUTHOR("Robert Jarzmik");
+MODULE_DESCRIPTION("PXA27x/PXA3xx Realtime Clock Driver (RTC)");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:pxa-rtc");