[PATCH] mpc5200: rtc driver
Domen Puncer
domen.puncer at telargo.com
Tue Jun 12 19:38:21 EST 2007
Driver for internal rtc on mpc5200.
It isn't very useful, since its contents don't remain on
power off.
Can be used to set alarm for wake-up from deep-sleep or
one second periodic interrupt ;-)
Signed-off-by: Domen Puncer <domen.puncer at telargo.com>
---
drivers/rtc/Kconfig | 10 +
drivers/rtc/Makefile | 1
drivers/rtc/rtc-mpc5200.c | 282 ++++++++++++++++++++++++++++++++++++++
include/asm-powerpc/mpc5200_rtc.h | 49 ++++++
4 files changed, 342 insertions(+)
Index: work-powerpc.git/drivers/rtc/Kconfig
===================================================================
--- work-powerpc.git.orig/drivers/rtc/Kconfig
+++ work-powerpc.git/drivers/rtc/Kconfig
@@ -401,4 +401,14 @@ config RTC_DRV_RS5C313
help
If you say yes here you get support for the Ricoh RS5C313 RTC chips.
+config RTC_DRV_MPC5200
+ tristate "MPC5200 RTC"
+ depends on RTC_CLASS
+ help
+ If you say yes here you will get support for the
+ RTC built in MPC5200(b) CPU.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-mpc5200.
+
endmenu
Index: work-powerpc.git/drivers/rtc/Makefile
===================================================================
--- work-powerpc.git.orig/drivers/rtc/Makefile
+++ work-powerpc.git/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_MPC5200) += rtc-mpc5200.o
Index: work-powerpc.git/drivers/rtc/rtc-mpc5200.c
===================================================================
--- /dev/null
+++ work-powerpc.git/drivers/rtc/rtc-mpc5200.c
@@ -0,0 +1,282 @@
+#include <linux/module.h>
+#include <linux/rtc.h>
+#include <asm/of_device.h>
+#include <asm/of_platform.h>
+#include <asm/io.h>
+#include <asm/mpc52xx.h>
+#include <asm/mpc5200_rtc.h>
+
+
+struct mpc5200_rtc_data {
+ unsigned irq;
+ unsigned irq_periodic;
+ struct mpc52xx_rtc __iomem *regs;
+ struct rtc_device *rtc;
+};
+
+static int mpc5200_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+ int tmp;
+
+ tm->tm_sec = in_8(®s->second);
+ tm->tm_min = in_8(®s->minute);
+
+ /* 12 hour format? */
+ if (in_8(®s->hour) & 0x20)
+ tm->tm_hour = (in_8(®s->hour) >> 1) + (in_8(®s->hour) & 1 ? 12 : 0);
+ else
+ tm->tm_hour = in_8(®s->hour);
+
+ tmp = in_8(®s->wday_mday);
+ tm->tm_mday = tmp & 0x1f;
+ tm->tm_mon = in_8(®s->month) - 1;
+ tm->tm_year = in_be16(®s->year) - 1900;
+ tm->tm_wday = (tmp >> 5) % 7;
+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
+ tm->tm_isdst = 0;
+
+ return 0;
+}
+
+static int mpc5200_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ /* time */
+ out_8(®s->second_set, tm->tm_sec);
+ out_8(®s->minute_set, tm->tm_min);
+ out_8(®s->hour_set, tm->tm_hour);
+
+ /* set time sequence */
+ out_8(®s->set_time, 0x1);
+ out_8(®s->set_time, 0x3);
+ out_8(®s->set_time, 0x1);
+ out_8(®s->set_time, 0x0);
+
+ /* date */
+ out_8(®s->month_set, tm->tm_mon + 1);
+ out_8(®s->weekday_set, tm->tm_wday ? tm->tm_wday : 7);
+ out_8(®s->date_set, tm->tm_mday);
+ out_be16(®s->year_set, tm->tm_year + 1900);
+
+ /* set date sequence */
+ out_8(®s->set_date, 0x1);
+ out_8(®s->set_date, 0x3);
+ out_8(®s->set_date, 0x1);
+ out_8(®s->set_date, 0x0);
+
+ return 0;
+}
+
+static int mpc5200_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ alrm->time.tm_sec = -1;
+ alrm->time.tm_min = in_8(®s->alm_min_set);
+ alrm->time.tm_hour = in_8(®s->alm_hour_set);
+
+ alrm->time.tm_mday = -1;
+ alrm->time.tm_mon = -1;
+ alrm->time.tm_year = -1;
+
+ alrm->enabled = in_8(®s->alm_enable);
+ alrm->pending = in_8(®s->alm_status);
+
+ return 0;
+}
+
+static int mpc5200_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ out_8(®s->alm_min_set, alrm->time.tm_min);
+ out_8(®s->alm_hour_set, alrm->time.tm_hour);
+
+ out_8(®s->alm_enable, alrm->enabled);
+
+ return 0;
+}
+
+static irqreturn_t rtc_handler(int irq, void *dev)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ if (in_8(®s->int_alm)) {
+ /* acknowledge */
+ out_8(®s->int_alm, 1);
+
+ rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_AF);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static irqreturn_t rtc_handler_upd(int irq, void *dev)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata((struct device *)dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ if (in_8(®s->int_sec) && (in_8(®s->int_enable) & 0x1)) {
+ /* acknowledge */
+ out_8(®s->int_sec, 1);
+
+ rtc_update_irq(rtc->rtc, 1, RTC_IRQF | RTC_UF);
+ return IRQ_HANDLED;
+ }
+
+ return IRQ_NONE;
+}
+
+static int mpc5200_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ switch (cmd) {
+ /* alarm interrupt */
+ case RTC_AIE_ON:
+ out_8(®s->alm_enable, 1);
+ break;
+ case RTC_AIE_OFF:
+ out_8(®s->alm_enable, 0);
+ break;
+
+ /* update interrupt (periodic second in mpc5200 words) */
+ case RTC_UIE_ON:
+ out_8(®s->int_enable, (in_8(®s->int_enable) & ~0x8) | 0x1);
+ break;
+ case RTC_UIE_OFF:
+ out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
+ break;
+
+ /* no periodic interrupts */
+ case RTC_IRQP_READ:
+ case RTC_IRQP_SET:
+ return -ENOTTY;
+
+ default:
+ return -ENOIOCTLCMD;
+ }
+ return 0;
+}
+
+static const struct rtc_class_ops mpc5200_rtc_ops = {
+ .read_time = mpc5200_rtc_read_time,
+ .set_time = mpc5200_rtc_set_time,
+ .read_alarm = mpc5200_rtc_read_alarm,
+ .set_alarm = mpc5200_rtc_set_alarm,
+ .ioctl = mpc5200_rtc_ioctl,
+};
+
+static int __devinit mpc5200_rtc_probe(struct of_device *op, const struct of_device_id *match)
+{
+ struct mpc5200_rtc_data *rtc;
+ int err = 0;
+
+ rtc = kzalloc(sizeof(*rtc), GFP_KERNEL);
+ if (!rtc) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ rtc->regs = mpc52xx_find_and_map("mpc5200-rtc");
+ if (!rtc->regs) {
+ printk(KERN_ERR "%s: couldn't map io space\n", __func__);
+ err = -ENOSYS;
+ goto out_free;
+ }
+
+ rtc->rtc = rtc_device_register("mpc5200-rtc", &op->dev,
+ &mpc5200_rtc_ops, THIS_MODULE);
+ if (IS_ERR(rtc->rtc)) {
+ err = PTR_ERR(rtc->rtc);
+ goto out_unmap;
+ }
+
+ dev_set_drvdata(&op->dev, rtc);
+
+ rtc->irq = irq_of_parse_and_map(op->node, 1);
+ if ((err = request_irq(rtc->irq, rtc_handler, IRQF_DISABLED, "mpc5200-rtc", &op->dev))) {
+ printk(KERN_ERR "%s: could not request irq: %i\n", __func__, rtc->irq);
+ goto out_dispose;
+ }
+
+ rtc->irq_periodic = irq_of_parse_and_map(op->node, 0);
+ if ((err = request_irq(rtc->irq_periodic, rtc_handler_upd, IRQF_DISABLED,
+ "mpc5200-rtc_upd", &op->dev))) {
+ printk(KERN_ERR "%s: could not request irq: %i\n", __func__, rtc->irq_periodic);
+ goto out_dispose2;
+ }
+
+ goto out;
+
+ out_dispose2:
+ irq_dispose_mapping(rtc->irq_periodic);
+ free_irq(rtc->irq, &op->dev);
+ out_dispose:
+ irq_dispose_mapping(rtc->irq);
+ out_unmap:
+ iounmap(rtc->regs);
+ out_free:
+ kfree(rtc);
+ out:
+ return err;
+}
+
+static int __devexit mpc5200_rtc_remove(struct of_device *op)
+{
+ struct mpc5200_rtc_data *rtc = dev_get_drvdata(&op->dev);
+ struct mpc52xx_rtc __iomem *regs = rtc->regs;
+
+ /* disable interrupt, so there are no nasty surprises */
+ out_8(®s->alm_enable, 0);
+ out_8(®s->int_enable, in_8(®s->int_enable) & ~0x1);
+
+ rtc_device_unregister(rtc->rtc);
+ iounmap(rtc->regs);
+ free_irq(rtc->irq, &op->dev);
+ free_irq(rtc->irq_periodic, &op->dev);
+ irq_dispose_mapping(rtc->irq);
+ irq_dispose_mapping(rtc->irq_periodic);
+ kfree(rtc);
+ dev_set_drvdata(&op->dev, NULL);
+
+ return 0;
+}
+
+static struct of_device_id mpc5200_rtc_match[] = {
+ { .type = "rtc", .compatible = "mpc5200-rtc", },
+ {},
+};
+
+static struct of_platform_driver mpc5200_rtc_driver = {
+ .owner = THIS_MODULE,
+ .name = "mpc5200-rtc",
+ .match_table = mpc5200_rtc_match,
+ .probe = mpc5200_rtc_probe,
+ .remove = mpc5200_rtc_remove,
+};
+
+static int __init mpc5200_rtc_init(void)
+{
+ return of_register_platform_driver(&mpc5200_rtc_driver);
+}
+
+static void __exit mpc5200_rtc_exit(void)
+{
+ of_unregister_platform_driver(&mpc5200_rtc_driver);
+}
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Domen Puncer <domen.puncer at telargo.com>");
+
+module_init(mpc5200_rtc_init);
+module_exit(mpc5200_rtc_exit);
Index: work-powerpc.git/include/asm-powerpc/mpc5200_rtc.h
===================================================================
--- /dev/null
+++ work-powerpc.git/include/asm-powerpc/mpc5200_rtc.h
@@ -0,0 +1,49 @@
+#ifndef _MPC5200_RTC_H_
+#define _MPC5200_RTC_H_
+
+/* RTC */
+struct mpc52xx_rtc {
+ u8 set_time; /* RTC + 0x00 */
+ u8 hour_set; /* RTC + 0x01 */
+ u8 minute_set; /* RTC + 0x02 */
+ u8 second_set; /* RTC + 0x03 */
+
+ u8 set_date; /* RTC + 0x04 */
+ u8 month_set; /* RTC + 0x05 */
+ u8 weekday_set; /* RTC + 0x06 */
+ u8 date_set; /* RTC + 0x07 */
+
+ u8 write_sw; /* RTC + 0x08 */
+ u8 sw_set; /* RTC + 0x09 */
+ u16 year_set; /* RTC + 0x0a */
+
+ u8 alm_enable; /* RTC + 0x0c */
+ u8 alm_hour_set; /* RTC + 0x0d */
+ u8 alm_min_set; /* RTC + 0x0e */
+ u8 int_enable; /* RTC + 0x0f */
+
+ u8 reserved1;
+ u8 hour; /* RTC + 0x11 */
+ u8 minute; /* RTC + 0x12 */
+ u8 second; /* RTC + 0x13 */
+
+ u8 month; /* RTC + 0x14 */
+ u8 wday_mday; /* RTC + 0x15 */
+ u16 year; /* RTC + 0x16 */
+
+ u8 int_alm; /* RTC + 0x18 */
+ u8 int_sw; /* RTC + 0x19 */
+ u8 alm_status; /* RTC + 0x1a */
+ u8 sw_minute; /* RTC + 0x1b */
+
+ u8 bus_error_1; /* RTC + 0x1c */
+ u8 int_day; /* RTC + 0x1d */
+ u8 int_min; /* RTC + 0x1e */
+ u8 int_sec; /* RTC + 0x1f */
+
+ u8 pterm; /* RTC + 0x20 */
+ u8 eterm; /* RTC + 0x21 */
+ u16 reserved2;
+};
+
+#endif /* _MPC5200_RTC_H_ */
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