[PATCH 4/6] 82xx: Add the support of Wind River SBC PowerQUICCII 82xx
Mark Zhan
rongkai.zhan at windriver.com
Fri Jun 8 18:56:02 EST 2007
Add the support of ST M48T59 RTC chip driver for SBC PowerQUICCII 82xx
board
Signed-off-by: Mark Zhan <rongkai.zhan at windriver.com>
---
b/drivers/rtc/Kconfig | 10 +
b/drivers/rtc/Makefile | 1
b/drivers/rtc/rtc-m48t59.c | 360
+++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 371 insertions(+)
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 4e4c10a..ca6a064 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -329,6 +329,16 @@ config RTC_DRV_S3C
This driver can also be build as a module. If so, the module
will be called rtc-s3c.
+config RTC_DRV_M48T59
+ tristate "ST M48T59"
+ depends on RTC_CLASS
+ help
+ If you say Y here you will get support for the
+ ST M48T59 RTC chip.
+
+ This driver can also be built as a module, if so, the module
+ will be called "rtc-m48t59".
+
config RTC_DRV_EP93XX
tristate "Cirrus Logic EP93XX"
depends on RTC_CLASS && ARCH_EP93XX
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index a1afbc2..70ba581 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -41,3 +41,4 @@ obj-$(CONFIG_RTC_DRV_V3020) += rtc-v3020
obj-$(CONFIG_RTC_DRV_AT91RM9200)+= rtc-at91rm9200.o
obj-$(CONFIG_RTC_DRV_SH) += rtc-sh.o
obj-$(CONFIG_RTC_DRV_BFIN) += rtc-bfin.o
+obj-$(CONFIG_RTC_DRV_M48T59) += rtc-m48t59.o
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
new file mode 100644
index 0000000..0737827
--- /dev/null
+++ b/drivers/rtc/rtc-m48t59.c
@@ -0,0 +1,360 @@
+/*
+ * ST M48T59 RTC driver
+ *
+ * Copyright (c) 2007 Wind River Systems, Inc.
+ *
+ * Author: Mark Zhan <rongkai.zhan at windriver.com>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/rtc.h>
+#include <linux/platform_device.h>
+#include <linux/bcd.h>
+
+#define DEBUG_M48T59 1
+
+#ifdef DEBUG_M48T59
+#define DPRINTK(fmt, args...) printk(KERN_DEBUG "%s: "fmt,
__FUNCTION__, ##args)
+#else
+#define DPRINTK(fmt, args...)
+#endif
+
+#define M48T59_YEAR 0x1fff
+#define M48T59_MONTH 0x1ffe
+#define M48T59_MDAY 0x1ffd /* Day of Month */
+#define M48T59_WDAY 0x1ffc /* Day of Week */
+#define M48T59_HOUR 0x1ffb
+#define M48T59_MIN 0x1ffa
+#define M48T59_SEC 0x1ff9
+#define M48T59_CNTL 0x1ff8
+#define M48T59_WATCHDOG 0x1ff7
+#define M48T59_INTR 0x1ff6
+#define M48T59_ALARM_DATE 0x1ff5
+#define M48T59_ALARM_HOUR 0x1ff4
+#define M48T59_ALARM_MIN 0x1ff3
+#define M48T59_ALARM_SEC 0x1ff2
+#define M48T59_UNUSED 0x1ff1
+#define M48T59_FLAGS 0x1ff0
+
+#define M48T59_WDAY_CB 0x20 /* Century Bit */
+#define M48T59_WDAY_CEB 0x10 /* Century Enable Bit */
+
+#define M48T59_CNTL_READ 0x40;
+#define M48T59_CNTL_WRITE 0x80;
+
+#define M48T59_FLAGS_WDT 0x80 /* watchdog timer expired */
+#define M48T59_FLAGS_AF 0x40 /* alarm */
+#define M48T59_FLAGS_BF 0x10 /* low battery */
+
+#define M48T59_INTR_AFE 0x80 /* Alarm Interrupt Enable */
+#define M48T59_INTR_ABE 0x20
+
+static unsigned char * m48t59_vbase = NULL;
+static unsigned int m48t59_irq = -1;
+
+#define M48T59_READ(reg) readb(m48t59_vbase+reg)
+#define M48T59_WRITE(val, reg) writeb((val), (m48t59_vbase+reg))
+
+/**
+ * NOTE: M48T59 only uses BCD mode
+ */
+static int m48t59_rtc_read_time(struct device *dev, struct rtc_time
*tm)
+{
+ unsigned char val;
+
+ /* Issue the READ command */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) | 0x40), M48T59_CNTL);
+
+ tm->tm_year = BCD2BIN(M48T59_READ(M48T59_YEAR));
+ /* tm_mon is 0-11 */
+ tm->tm_mon = BCD2BIN(M48T59_READ(M48T59_MONTH)) - 1;
+ tm->tm_mday = BCD2BIN(M48T59_READ(M48T59_MDAY));
+
+ val = M48T59_READ(M48T59_WDAY);
+ if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB)) {
+ DPRINTK("Century bit is enabled\n");
+ tm->tm_year += 100; /* one century */
+ }
+
+ tm->tm_wday = BCD2BIN(val & 0x07);
+ tm->tm_hour = BCD2BIN(M48T59_READ(M48T59_HOUR) & 0x3F);
+ tm->tm_min = BCD2BIN(M48T59_READ(M48T59_MIN) & 0x7F);
+ tm->tm_sec = BCD2BIN(M48T59_READ(M48T59_SEC) & 0x7F);
+
+ /* Clear the READ bit to restore the update */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) & ~0x40), M48T59_CNTL);
+
+ DPRINTK("RTC read time %04d-%02d-%02d %02d/%02d/%02d\n",
+ tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+ return 0;
+}
+
+static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ unsigned char val = 0;
+
+ DPRINTK("RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
+ tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+
+ /* Issue the WRITE command */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) | 0x80), M48T59_CNTL);
+
+ M48T59_WRITE((BIN2BCD(tm->tm_sec) & 0x7F), M48T59_SEC);
+ M48T59_WRITE((BIN2BCD(tm->tm_min) & 0x7F), M48T59_MIN);
+ M48T59_WRITE((BIN2BCD(tm->tm_hour) & 0x3F), M48T59_HOUR);
+ M48T59_WRITE((BIN2BCD(tm->tm_mday) & 0x3F), M48T59_MDAY);
+ /* tm_mon is 0-11 */
+ M48T59_WRITE((BIN2BCD(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
+ M48T59_WRITE(BIN2BCD(tm->tm_year % 100), M48T59_YEAR);
+
+ if (tm->tm_year/100)
+ val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
+ val |= (BIN2BCD(tm->tm_wday) & 0x07);
+ M48T59_WRITE(val, M48T59_WDAY);
+
+ /* update ended */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) & ~0x80), M48T59_CNTL);
+
+ return 0;
+}
+
+/*
+ * Read alarm time and date in RTC
+ */
+static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm
*alrm)
+{
+ unsigned char val;
+ struct rtc_time *tm = &alrm->time;
+
+ /* If no irq, we don't support ALARM */
+ if (m48t59_irq == -1)
+ return -EIO;
+
+ /* Issue the READ command */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) | 0x40), M48T59_CNTL);
+
+ tm->tm_year = BCD2BIN(M48T59_READ(M48T59_YEAR));
+ /* tm_mon is 0-11 */
+ tm->tm_mon = BCD2BIN(M48T59_READ(M48T59_MONTH)) - 1;
+
+ val = M48T59_READ(M48T59_WDAY);
+ if ((val & M48T59_WDAY_CEB) && (val & M48T59_WDAY_CB))
+ tm->tm_year += 100; /* one century */
+
+ tm->tm_mday = BCD2BIN(M48T59_READ(M48T59_ALARM_DATE));
+ tm->tm_hour = BCD2BIN(M48T59_READ(M48T59_ALARM_HOUR));
+ tm->tm_min = BCD2BIN(M48T59_READ(M48T59_ALARM_MIN));
+ tm->tm_sec = BCD2BIN(M48T59_READ(M48T59_ALARM_SEC));
+
+ /* Clear the READ bit to restore the update */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) & ~0x40), M48T59_CNTL);
+
+ DPRINTK("RTC read alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
+ tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+ return 0;
+}
+
+/*
+ * Set alarm time and date in RTC
+ */
+static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm
*alrm)
+{
+ struct rtc_time *tm = &alrm->time;
+ unsigned char mday, hour, min, sec;
+
+ if (m48t59_irq == -1)
+ return -EIO;
+
+ /*
+ * 0xff means "always match"
+ */
+ mday = tm->tm_mday;
+ mday = (mday >= 1 && mday <= 31) ? BIN2BCD(mday) : 0xff;
+ if (mday == 0xff)
+ mday = M48T59_READ(M48T59_MDAY);
+
+ hour = tm->tm_hour;
+ hour = (hour < 24) ? BIN2BCD(hour) : 0x00;
+
+ min = tm->tm_min;
+ min = (min < 60) ? BIN2BCD(min) : 0x00;
+
+ sec = tm->tm_sec;
+ sec = (sec < 60) ? BIN2BCD(sec) : 0x00;
+
+ /* Issue the WRITE command */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) | 0x80), M48T59_CNTL);
+
+ M48T59_WRITE(mday, M48T59_ALARM_DATE);
+ M48T59_WRITE(hour, M48T59_ALARM_HOUR);
+ M48T59_WRITE(min, M48T59_ALARM_MIN);
+ M48T59_WRITE(sec, M48T59_ALARM_SEC);
+
+ /* update ended */
+ M48T59_WRITE((M48T59_READ(M48T59_CNTL) & ~0x80), M48T59_CNTL);
+
+ DPRINTK("RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
+ tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+ tm->tm_hour, tm->tm_min, tm->tm_sec);
+ return 0;
+}
+
+/*
+ * Handle commands from user-space
+ */
+static int m48t59_rtc_ioctl(struct device *dev, unsigned int cmd,
+ unsigned long arg)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case RTC_AIE_OFF: /* alarm interrupt off */
+ M48T59_WRITE(0x00, M48T59_INTR);
+ break;
+ case RTC_AIE_ON: /* alarm interrupt on */
+ M48T59_WRITE(M48T59_INTR_AFE, M48T59_INTR);
+ break;
+ default:
+ ret = -ENOIOCTLCMD;
+ break;
+ }
+
+ return ret;
+}
+
+static int m48t59_rtc_proc(struct device *dev, struct seq_file *seq)
+{
+ unsigned char val;
+
+ val = M48T59_READ(M48T59_FLAGS);
+ seq_printf(seq, "battery\t\t: %s\n",
+ (val & M48T59_FLAGS_BF) ? "low" : "normal");
+
+ return 0;
+}
+
+/*
+ * IRQ handler for the RTC
+ */
+static irqreturn_t m48t59_rtc_interrupt(int irq, void *dev_id)
+{
+ unsigned char flags;
+ struct platform_device *pdev = (struct platform_device *)dev_id;
+ struct rtc_device *rdev;
+
+ flags = M48T59_READ(M48T59_FLAGS);
+ if (flags & M48T59_FLAGS_AF) {
+ rdev = (struct rtc_device *)platform_get_drvdata(pdev);
+ rtc_update_irq(rdev, 1, (RTC_AF | RTC_IRQF));
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static const struct rtc_class_ops m48t59_rtc_ops = {
+ .ioctl = m48t59_rtc_ioctl,
+ .read_time = m48t59_rtc_read_time,
+ .set_time = m48t59_rtc_set_time,
+ .read_alarm = m48t59_rtc_readalarm,
+ .set_alarm = m48t59_rtc_setalarm,
+ .proc = m48t59_rtc_proc,
+};
+
+static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ struct rtc_device *rtc_dev;
+ int ret = 0;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -ENODEV;
+
+ m48t59_vbase = ioremap(res->start, (res->end - res->start + 1));
+ if (!m48t59_vbase)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (res)
+ m48t59_irq = res->start;
+
+ if (m48t59_irq != -1) {
+ ret = request_irq(m48t59_irq, m48t59_rtc_interrupt,
+ IRQF_SHARED, "rtc-m48t59", pdev);
+ if (ret)
+ goto err_unmap;
+ }
+
+ rtc_dev = rtc_device_register("m48t59", &pdev->dev,
+ &m48t59_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc_dev)) {
+ ret = PTR_ERR(rtc_dev);
+ goto err_freeirq;
+ }
+
+ platform_set_drvdata(pdev, rtc_dev);
+ return 0;
+
+err_freeirq:
+ if (m48t59_irq != -1)
+ free_irq(m48t59_irq, pdev);
+err_unmap:
+ iounmap(m48t59_vbase);
+ return ret;
+}
+
+static int __devexit m48t59_rtc_remove(struct platform_device *pdev)
+{
+ struct rtc_device *rtc = platform_get_drvdata(pdev);
+
+ if (rtc)
+ rtc_device_unregister(rtc);
+
+ platform_set_drvdata(pdev, NULL);
+
+ if (m48t59_vbase)
+ iounmap(m48t59_vbase);
+ m48t59_vbase = NULL;
+
+ if (m48t59_irq != -1)
+ free_irq(m48t59_irq, pdev);
+ m48t59_irq = -1;
+ return 0;
+}
+
+static struct platform_driver m48t59_rtc_platform_driver = {
+ .driver = {
+ .name = "rtc-m48t59",
+ .owner = THIS_MODULE,
+ },
+ .probe = m48t59_rtc_probe,
+ .remove = __devexit_p(m48t59_rtc_remove),
+};
+
+static int __init m48t59_rtc_init(void)
+{
+ return platform_driver_register(&m48t59_rtc_platform_driver);
+}
+
+static void __exit m48t59_rtc_exit(void)
+{
+ platform_driver_unregister(&m48t59_rtc_platform_driver);
+}
+
+module_init(m48t59_rtc_init);
+module_exit(m48t59_rtc_exit);
+
+MODULE_AUTHOR("Mark Zhan <rongkai.zhan at windriver.com>");
+MODULE_DESCRIPTION("M48T59 RTC driver");
+MODULE_LICENSE("GPL");
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