mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
682 lines
18 KiB
Diff
682 lines
18 KiB
Diff
From 6462d09dad154b69ea6180c0acb2d009627ff1be Mon Sep 17 00:00:00 2001
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From: Alison Wang <b18965@freescale.com>
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Date: Thu, 4 Aug 2011 09:59:46 +0800
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Subject: [PATCH 27/52] Add RTC driver support on MCF5441x platform
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Support on-chip robust-RTC module on MCF5441x platform.
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Signed-off-by: Alison Wang <b18965@freescale.com>
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---
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drivers/rtc/Kconfig | 9 +
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drivers/rtc/Makefile | 1 +
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drivers/rtc/rtc-m5441x.c | 638 ++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 648 insertions(+), 0 deletions(-)
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create mode 100644 drivers/rtc/rtc-m5441x.c
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--- a/drivers/rtc/Kconfig
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+++ b/drivers/rtc/Kconfig
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@@ -928,6 +928,15 @@ config RTC_MCF
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If you build it as a module it will be call mcf-rtc.
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+config RTC_M5441X
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+ tristate "Freescale Coldfire M5441X platform Real Time Clock"
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+ depends on COLDFIRE
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+ help
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+ If you say yes here you will get support for the on-chip Coldfire
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+ Real-Time Clock for mcf5441x platform.
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+
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+ If you build it as a module it will be call rtc-m5441x.
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+
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config RTC_DRV_PS3
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tristate "PS3 RTC"
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depends on PPC_PS3
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--- a/drivers/rtc/Makefile
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+++ b/drivers/rtc/Makefile
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@@ -103,3 +103,4 @@ obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm83
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obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
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obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
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obj-$(CONFIG_RTC_MCF) += rtc-mcf.o
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+obj-$(CONFIG_RTC_M5441X) += rtc-m5441x.o
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--- /dev/null
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+++ b/drivers/rtc/rtc-m5441x.c
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@@ -0,0 +1,638 @@
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+/*
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+ * Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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+ *
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+ * Lanttor.Guo@freescale.com
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+ *
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+ * The code contained herein is licensed under the GNU General Public
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+ * License. You may obtain a copy of the GNU General Public License
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+ * Version 2 or later at the following locations:
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+ *
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+ * http://www.opensource.org/licenses/gpl-license.html
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+ * http://www.gnu.org/copyleft/gpl.html
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+ */
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+
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+/*
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+ * Implementation based on rtc-mcf.c
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+ */
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+
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+/*
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+ * RTC Real Time Clock (RTC) Driver
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+ *
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+ * @file rtc-m5441x.c
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+ * @brief Real Time Clock interface
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+ *
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+ * This file contains Real Time Clock interface for Linux.
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+ *
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+ */
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+#include <linux/rtc.h>
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+#include <linux/module.h>
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+#include <linux/fs.h>
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+#include <linux/init.h>
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+#include <linux/interrupt.h>
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+#include <linux/platform_device.h>
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+#include <linux/clk.h>
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+#include <linux/uaccess.h>
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+#include <asm/mcfsim.h>
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+#include <linux/slab.h>
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+#include <linux/io.h>
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+
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+#ifdef readw
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+#undef readw
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+#endif
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+
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+#ifdef writew
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+#undef writew
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+#endif
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+
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+#define readw(addr) in_be16(addr)
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+#define writew(val, addr) out_be16((addr), (val))
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+
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+
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+#define PIT_ALL_ON (MCF_RTC_ISR_2HZ | MCF_RTC_ISR_SAM0 | MCF_RTC_ISR_SAM1 | \
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+ MCF_RTC_ISR_SAM2 | MCF_RTC_ISR_SAM3 | MCF_RTC_ISR_SAM4 | \
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+ MCF_RTC_ISR_SAM5 | MCF_RTC_ISR_SAM6 | MCF_RTC_ISR_SAM7)
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+
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+#define MAX_PIE_NUM 9
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+#define MAX_PIE_FREQ 512
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+const u32 PIE_BIT_DEF[MAX_PIE_NUM][2] = {
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+ {2, MCF_RTC_ISR_2HZ},
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+ {4, MCF_RTC_ISR_SAM0},
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+ {8, MCF_RTC_ISR_SAM1},
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+ {16, MCF_RTC_ISR_SAM2},
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+ {32, MCF_RTC_ISR_SAM3},
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+ {64, MCF_RTC_ISR_SAM4},
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+ {128, MCF_RTC_ISR_SAM5},
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+ {256, MCF_RTC_ISR_SAM6},
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+ {MAX_PIE_FREQ, MCF_RTC_ISR_SAM7},
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+};
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+
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+/* Those are the bits from a classic RTC we want to mimic */
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+#define RTC_IRQF 0x80 /* any of the following 3 is active */
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+#define RTC_PF 0x40 /* Periodic interrupt */
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+#define RTC_AF 0x20 /* Alarm interrupt */
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+#define RTC_UF 0x10 /* Update interrupt for 1Hz RTC */
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+
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+#define MCF_RTC_TIME 0
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+#define MCF_RTC_ALARM 1
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+
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+struct rtc_plat_data {
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+ struct rtc_device *rtc;
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+ int irq;
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+ unsigned int irqen;
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+ int alrm_sec;
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+ int alrm_min;
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+ int alrm_hour;
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+ int alrm_mday;
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+};
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+
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+static const int year_cal_basic = 2112;
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+
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+#define RTC_VERSION "0.1"
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+
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+static u32 rtc_freq = 2; /* minimun value for PIE */
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+static unsigned long rtc_status;
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+
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+static struct rtc_time g_rtc_alarm = {
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+ .tm_year = 0,
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+ .tm_mon = 0,
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+ .tm_mday = 0,
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+ .tm_hour = 0,
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+ .tm_mon = 0,
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+ .tm_sec = 0,
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+};
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+
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+static DEFINE_SPINLOCK(rtc_lock);
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+
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+
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+/*
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+ * This funciton is used to disable RTC register write protection
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+ */
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+static void disable_register_write_protection(void)
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+{
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+ if (readw(MCF_RTC_SR) & MCF_RTC_SR_WPE) {
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+ writew(0x0000, MCF_RTC_CR);
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+ writew(0x0001, MCF_RTC_CR);
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+ writew(0x0003, MCF_RTC_CR);
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+ writew(0x0002, MCF_RTC_CR);
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+ }
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+
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+}
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+
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+/*
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+ * This function is used to obtain the RTC time or the alarm value in
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+ * second.
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+ *
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+ * @param time_alarm use MCF_RTC_TIME for RTC time value;
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+ * MCF_RTC_ALARM for alarm value
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+ *
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+ * @return The RTC time or alarm time in second.
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+ */
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+static u32 get_alarm_or_time(struct device *dev, int time_alarm,
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+ struct rtc_time *tm)
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+{
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+ dev_dbg(dev, "debug function %s()!\n", __func__);
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+
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+ if (time_alarm == MCF_RTC_TIME) {
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+ /*check register information */
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+ dev_dbg(dev, "RTC_YEARMON:0x%x,RTC_DAYS:0x%x,RTC_HOURMIN:0x%x,"
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+ "RTC_SECONDS:0x%x\n", readw(MCF_RTC_YEARMON),
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+ readw(MCF_RTC_DAYS), readw(MCF_RTC_HOURMIN),
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+ readw(MCF_RTC_SECONDS));
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+
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+ /* get year */
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+ tm->tm_year = year_cal_basic +
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+ (char)(MCF_RTC_YEARMON_YEAR_RD(readw(MCF_RTC_YEARMON)));
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+ /* get month */
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+ tm->tm_mon =
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+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_YEARMON)) - 1;
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+ /* get month day */
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+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_DAYS));
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+ /* get year day */
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+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
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+ tm->tm_year);
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+ /* year minus 1900 */
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+ tm->tm_year = tm->tm_year - 1900;
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+ /* get week day */
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+ tm->tm_wday = MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_DAYS));
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+ /* get hours */
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+ tm->tm_hour =
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+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_HOURMIN));
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+ /* get minutes */
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+ tm->tm_min =
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+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_HOURMIN));
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+ /* get seconds */
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+ tm->tm_sec =
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+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_SECONDS));
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+ /* no day saving time */
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+ tm->tm_isdst = -1;
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+
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+ /* check rtc_tm fileds information */
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+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
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+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
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+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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+ tm->tm_hour, tm->tm_min, tm->tm_sec);
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+
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+ } else if (time_alarm == MCF_RTC_ALARM) {
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+ tm->tm_year = year_cal_basic +
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+ (char)MCF_RTC_YEARMON_YEAR_RD
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+ (readw(MCF_RTC_ALRM_YRMON));
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+ tm->tm_mon =
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+ MCF_RTC_YEARMON_MON_RD(readw(MCF_RTC_ALRM_YRMON)) - 1;
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+ tm->tm_mday = MCF_RTC_DAYS_DAY_RD(readw(MCF_RTC_ALRM_DAYS));
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+ tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon,
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+ tm->tm_year);
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+ tm->tm_year = tm->tm_year - 1900;
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+ tm->tm_wday =
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+ MCF_RTC_DAYS_DAYWEEK_RD(readw(MCF_RTC_ALRM_DAYS));
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+ tm->tm_hour =
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+ MCF_RTC_HOURMIN_HOURS_RD(readw(MCF_RTC_ALRM_HM));
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+ tm->tm_min =
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+ MCF_RTC_HOURMIN_MINUTES_RD(readw(MCF_RTC_ALRM_HM));
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+ tm->tm_sec =
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+ MCF_RTC_SECONDS_SECONDS_RD(readw(MCF_RTC_ALRM_SEC));
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+ tm->tm_isdst = -1;
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+
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+ /* debug information */
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+ dev_dbg(dev, "RTC ALARM --> year:%d,yday:%d,mon:%d,mday:%d,"
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+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
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+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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+ tm->tm_hour, tm->tm_min, tm->tm_sec);
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+
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+ } else {
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+ panic("wrong value for time_alarm=%d\n", time_alarm);
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+ }
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+
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+ return 0;
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+}
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+
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+/*
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+ * This function sets the RTC alarm value or the time value.
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+ *
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+ * @param time_alarm the new alarm value to be updated in the RTC
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+ * @param time use MCF_RTC_TIME for RTC time value;
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+ * MCF_RTC_ALARM for alarm value
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+ */
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+static void set_alarm_or_time(struct device *dev, int time_alarm,
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+ struct rtc_time *tm)
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+{
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+ char year;
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+
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+ dev_dbg(dev, "debug function %s()!\n", __func__);
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+
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+ /* wirte enable setting */
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+ disable_register_write_protection();
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+
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+ if (time_alarm == MCF_RTC_TIME) {
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+ /* check rtc_time fields information */
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+ dev_dbg(dev, "RTC TIME --> year:%d,yday:%d,mon:%d,mday:%d,"
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+ "wday:%d,hour:%d,min:%d,sec:%d\n", tm->tm_year,
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+ tm->tm_yday, tm->tm_mon, tm->tm_mday, tm->tm_wday,
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+ tm->tm_hour, tm->tm_min, tm->tm_sec);
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+
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+ year = ((tm->tm_year + 1900) - year_cal_basic);
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+ /* write RTC_YEARMON register */
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+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_YEARMON);
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+
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+ /* write RTC_DAYS register */
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+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
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+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_DAYS);
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+
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+ /* write RTC_HOURMIN register */
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+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
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+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
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+ MCF_RTC_HOURMIN);
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+
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+ /* write RTC_SECONDS register */
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+ writew(MCF_RTC_SECONDS_SECONDS_SET
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+ (tm->tm_sec), MCF_RTC_SECONDS);
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+
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+ /* debug information */
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+ dev_dbg(dev, "RTC_YEARMON:0x%x, RTC_DAYS:0x%x, "
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+ "RTC_HOURMIN:0x%x, RTC_SECONDS:0x%x\n",
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+ readw(MCF_RTC_YEARMON), readw(MCF_RTC_DAYS),
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+ readw(MCF_RTC_HOURMIN), readw(MCF_RTC_SECONDS));
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+ } else if (time_alarm == MCF_RTC_ALARM) {
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+
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+ year = ((tm->tm_year + 1900) - year_cal_basic);
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+ /* write RTC_YEARMON register */
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+ writew((year << 8) | (tm->tm_mon + 1), MCF_RTC_ALRM_YRMON);
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+
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+ /* write RTC_DAYS register */
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+ writew(MCF_RTC_DAYS_DAYWEEK_SET(tm->tm_wday) |
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+ MCF_RTC_DAYS_DAY_SET(tm->tm_mday), MCF_RTC_ALRM_DAYS);
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+
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+ /* write RTC_HOURMIN register */
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+ writew(MCF_RTC_HOURMIN_HOURS_SET(tm->tm_hour) |
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+ MCF_RTC_HOURMIN_MINUTES_SET(tm->tm_min),
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+ MCF_RTC_ALRM_HM);
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+
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+ /* write RTC_SECONDS register */
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+ writew(MCF_RTC_SECONDS_SECONDS_SET
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+ (tm->tm_sec), MCF_RTC_ALRM_SEC);
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+
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+ /* debug information */
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+ dev_dbg(dev, "ALRM_YRMON:0x%x,ALRM_DAYS:0x%x,ALRM_HM:0x%x,"
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+ "ALRM_SEC:0x%x\n", readw(MCF_RTC_ALRM_YRMON),
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+ readw(MCF_RTC_ALRM_DAYS), readw(MCF_RTC_ALRM_HM),
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+ readw(MCF_RTC_ALRM_SEC));
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+ } else {
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+ panic("wrong value for time_alarm=%d\n", time_alarm);
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+ }
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+}
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+
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+/*!
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+ * This function updates the RTC alarm registers and then clears all the
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+ * interrupt status bits.
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+ *
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+ * @param alrm the new alarm value to be updated in the RTC
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+ *
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+ * @return 0 if successful; non-zero otherwise.
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+ */
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+static int rtc_update_alarm(struct device *dev, struct rtc_time *alrm)
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+{
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+ /* clear all the interrupt status bits */
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+ disable_register_write_protection();
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+
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+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
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+
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+ set_alarm_or_time(dev, MCF_RTC_ALARM, alrm);
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+
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+ return 0;
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+}
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+
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+/*!
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+ * This function is the RTC interrupt service routine.
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+ *
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+ * @param irq RTC IRQ number
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+ * @param dev_id device ID which is not used
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+ *
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+ * @return IRQ_HANDLED as defined in the include/linux/interrupt.h file.
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+ */
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+static irqreturn_t mcf_rtc_interrupt(int irq, void *dev_id)
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+{
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+ struct platform_device *pdev = dev_id;
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+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
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+ u16 status = 0;
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+ u32 events = 0;
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+
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+ spin_lock(&rtc_lock);
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+
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+ /* clear interrupt sources */
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+ status = readw(MCF_RTC_ISR) & readw(MCF_RTC_IER);
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+
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+ disable_register_write_protection();
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+
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+ writew(status, MCF_RTC_ISR);
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+
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+ /* clear alarm interrupt if it has occurred */
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+ if (status & MCF_RTC_ISR_ALM)
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+ status &= ~MCF_RTC_ISR_ALM;
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+
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+ /* update irq data & counter */
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+ if (status & MCF_RTC_ISR_ALM)
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+ events |= (RTC_AF | RTC_IRQF);
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+ if (status & MCF_RTC_ISR_1HZ)
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+ events |= (RTC_UF | RTC_IRQF);
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+ if (status & PIT_ALL_ON)
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+ events |= (RTC_PF | RTC_IRQF);
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+
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+ if ((status & MCF_RTC_ISR_ALM) && rtc_valid_tm(&g_rtc_alarm))
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+ rtc_update_alarm(&pdev->dev, &g_rtc_alarm);
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+
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+ spin_unlock(&rtc_lock);
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+ rtc_update_irq(pdata->rtc, 1, events);
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+ return IRQ_HANDLED;
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+}
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+
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+/*!
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+ * clear all interrupts and release the IRQ
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+ */
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+static void mcf_rtc_release(struct device *dev)
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+{
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+ spin_lock_irq(&rtc_lock);
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+
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+ disable_register_write_protection();
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+
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+ writew(0, MCF_RTC_IER); /* Disable all rtc interrupts */
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+ writew(readw(MCF_RTC_ISR), MCF_RTC_ISR);
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+ spin_unlock_irq(&rtc_lock);
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+ rtc_status = 0;
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+}
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+
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+/*!
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+ * This function is used to support some ioctl calls directly.
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+ * Other ioctl calls are supported indirectly through the
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+ * arm/common/rtctime.c file.
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+ *
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+ * @param cmd ioctl command as defined in include/linux/rtc.h
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+ * @param arg value for the ioctl command
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+ *
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+ * @return 0 if successful or negative value otherwise.
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+ */
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+static int mcf_rtc_ioctl(struct device *dev, unsigned int cmd,
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+ unsigned long arg)
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+{
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+ int i;
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+
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+ disable_register_write_protection();
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+
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+ switch (cmd) {
|
|
+ case RTC_PIE_OFF:
|
|
+ writew((readw(MCF_RTC_IER) & ~PIT_ALL_ON), MCF_RTC_IER);
|
|
+ return 0;
|
|
+ case RTC_IRQP_SET:
|
|
+ if (arg < 2 || arg > MAX_PIE_FREQ || (arg % 2) != 0)
|
|
+ return -EINVAL; /* Also make sure a power of 2Hz */
|
|
+ if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
|
|
+ return -EACCES;
|
|
+ rtc_freq = arg;
|
|
+ return 0;
|
|
+ case RTC_IRQP_READ:
|
|
+ return put_user(rtc_freq, (u32 *) arg);
|
|
+ case RTC_PIE_ON:
|
|
+ for (i = 0; i < MAX_PIE_NUM; i++) {
|
|
+ if (PIE_BIT_DEF[i][0] == rtc_freq)
|
|
+ break;
|
|
+ }
|
|
+ if (i == MAX_PIE_NUM)
|
|
+ return -EACCES;
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+ writew((readw(MCF_RTC_IER) | PIE_BIT_DEF[i][1]), MCF_RTC_IER);
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+ return 0;
|
|
+ case RTC_AIE_OFF:
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM), MCF_RTC_IER);
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+ return 0;
|
|
+
|
|
+ case RTC_AIE_ON:
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM), MCF_RTC_IER);
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+ return 0;
|
|
+
|
|
+ case RTC_UIE_OFF: /* UIE is for the 1Hz interrupt */
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_1HZ), MCF_RTC_IER);
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+ return 0;
|
|
+
|
|
+ case RTC_UIE_ON:
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_1HZ), MCF_RTC_IER);
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+ return 0;
|
|
+ }
|
|
+ return -ENOIOCTLCMD;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function reads the current RTC time into tm in Gregorian date.
|
|
+ *
|
|
+ * @param tm contains the RTC time value upon return
|
|
+ *
|
|
+ * @return 0 if successful; non-zero otherwise.
|
|
+ */
|
|
+static int mcf_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
+{
|
|
+ do {
|
|
+ get_alarm_or_time(dev, MCF_RTC_TIME, tm);
|
|
+ } while (0);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function sets the internal RTC time based on tm in Gregorian date.
|
|
+ *
|
|
+ * @param tm the time value to be set in the RTC
|
|
+ *
|
|
+ * @return 0 if successful; non-zero otherwise.
|
|
+ */
|
|
+static int mcf_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
+{
|
|
+ do {
|
|
+ set_alarm_or_time(dev, MCF_RTC_TIME, tm);
|
|
+ } while (0);
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function reads the current alarm value into the passed in \b alrm
|
|
+ * argument. It updates the \b alrm's pending field value based on the whether
|
|
+ * an alarm interrupt occurs or not.
|
|
+ *
|
|
+ * @param alrm contains the RTC alarm value upon return
|
|
+ *
|
|
+ * @return 0 if successful; non-zero otherwise.
|
|
+ */
|
|
+static int mcf_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
+{
|
|
+ do {
|
|
+ get_alarm_or_time(dev, MCF_RTC_ALARM, &alrm->time);
|
|
+ } while (0);
|
|
+
|
|
+ alrm->pending = ((readw(MCF_RTC_ISR) & MCF_RTC_ISR_ALM) != 0) ? 1 : 0;
|
|
+
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function sets the RTC alarm based on passed in alrm.
|
|
+ *
|
|
+ * @param alrm the alarm value to be set in the RTC
|
|
+ *
|
|
+ * @return 0 if successful; non-zero otherwise.
|
|
+ */
|
|
+static int mcf_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
+{
|
|
+ int ret;
|
|
+
|
|
+ spin_lock_irq(&rtc_lock);
|
|
+
|
|
+ disable_register_write_protection();
|
|
+
|
|
+ if (rtc_valid_tm(&alrm->time)) {
|
|
+ if (alrm->time.tm_sec > 59 ||
|
|
+ alrm->time.tm_hour > 23 || alrm->time.tm_min > 59) {
|
|
+ ret = -EINVAL;
|
|
+ goto out;
|
|
+ }
|
|
+ ret = rtc_update_alarm(dev, &alrm->time);
|
|
+ } else {
|
|
+ ret = rtc_valid_tm(&alrm->time);
|
|
+ if (ret)
|
|
+ goto out;
|
|
+ ret = rtc_update_alarm(dev, &alrm->time);
|
|
+ }
|
|
+
|
|
+ if (ret == 0) {
|
|
+ memcpy(&g_rtc_alarm, &alrm->time, sizeof(struct rtc_time));
|
|
+
|
|
+ if (alrm->enabled) {
|
|
+ writew((readw(MCF_RTC_IER) | MCF_RTC_ISR_ALM),
|
|
+ MCF_RTC_IER);
|
|
+ } else {
|
|
+ writew((readw(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM),
|
|
+ MCF_RTC_IER);
|
|
+ }
|
|
+ }
|
|
+out:
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * The RTC driver structure
|
|
+ */
|
|
+static struct rtc_class_ops mcf_rtc_ops = {
|
|
+ .ioctl = mcf_rtc_ioctl,
|
|
+ .read_time = mcf_rtc_read_time,
|
|
+ .set_time = mcf_rtc_set_time,
|
|
+ .read_alarm = mcf_rtc_read_alarm,
|
|
+ .set_alarm = mcf_rtc_set_alarm,
|
|
+};
|
|
+
|
|
+static int __devinit mcf_rtc_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct rtc_device *rtc;
|
|
+ struct rtc_plat_data *pdata = NULL;
|
|
+ u32 ret = 0;
|
|
+
|
|
+ disable_register_write_protection();
|
|
+ /* Clear interrupt before request irq */
|
|
+ writew(0x0100, MCF_RTC_CR);
|
|
+ writew(0x0001, MCF_RTC_IER);
|
|
+
|
|
+ if (!(readw(MCF_RTC_CFG_DATA) & MCF_RTC_CFG_DATA_OSCEN))
|
|
+ writew(MCF_RTC_CFG_DATA_OSCEN, MCF_RTC_CFG_DATA);
|
|
+
|
|
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
|
|
+ if (!pdata)
|
|
+ return -ENOMEM;
|
|
+
|
|
+ pdata->irq = MCFINT_VECBASE + MCFINT_RTC;
|
|
+ if (request_irq(pdata->irq, mcf_rtc_interrupt, IRQF_DISABLED,
|
|
+ pdev->name, pdev) < 0) {
|
|
+ dev_warn(&pdev->dev, "interrupt not available.\n");
|
|
+ pdata->irq = -1;
|
|
+ }
|
|
+
|
|
+ if (test_and_set_bit(1, &rtc_status))
|
|
+ return -EBUSY;
|
|
+
|
|
+ rtc = rtc_device_register(pdev->name, &pdev->dev, &mcf_rtc_ops,
|
|
+ THIS_MODULE);
|
|
+ if (IS_ERR(rtc)) {
|
|
+ ret = PTR_ERR(rtc);
|
|
+ if (pdata->irq >= 0)
|
|
+ free_irq(pdata->irq, pdev);
|
|
+ kfree(pdata);
|
|
+ return ret;
|
|
+ }
|
|
+ pdata->rtc = rtc;
|
|
+ platform_set_drvdata(pdev, pdata);
|
|
+
|
|
+ dev_dbg(&pdev->dev, "RTC_CR:0x%x, RTC_SR:0x%x\n", readw(MCF_RTC_CR),
|
|
+ readw(MCF_RTC_SR));
|
|
+
|
|
+ printk(KERN_INFO "Real Time Clock Driver v%s\n", RTC_VERSION);
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+static int __devexit mcf_rtc_remove(struct platform_device *pdev)
|
|
+{
|
|
+ struct rtc_plat_data *pdata = platform_get_drvdata(pdev);
|
|
+
|
|
+ rtc_device_unregister(pdata->rtc);
|
|
+ if (pdata->irq >= 0)
|
|
+ free_irq(pdata->irq, pdev);
|
|
+ kfree(pdata);
|
|
+ mcf_rtc_release(NULL);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * Contains pointers to the power management callback functions.
|
|
+ */
|
|
+MODULE_ALIAS("rtc-m5441x");
|
|
+static struct platform_driver mcf_rtc_driver = {
|
|
+ .driver = {
|
|
+ .name = "rtc-m5441x",
|
|
+ .owner = THIS_MODULE,
|
|
+ },
|
|
+ .probe = mcf_rtc_probe,
|
|
+ .remove = __devexit_p(mcf_rtc_remove),
|
|
+};
|
|
+
|
|
+/*!
|
|
+ * This function creates the /proc/driver/rtc file and registers the device RTC
|
|
+ * in the /dev/misc directory. It also reads the RTC value from external source
|
|
+ * and setup the internal RTC properly.
|
|
+ *
|
|
+ * @return -1 if RTC is failed to initialize; 0 is successful.
|
|
+ */
|
|
+static int __init mcf_rtc_init(void)
|
|
+{
|
|
+ return platform_driver_register(&mcf_rtc_driver);
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function removes the /proc/driver/rtc file and un-registers the
|
|
+ * device RTC from the /dev/misc directory.
|
|
+ */
|
|
+static void __exit mcf_rtc_exit(void)
|
|
+{
|
|
+ platform_driver_unregister(&mcf_rtc_driver);
|
|
+
|
|
+}
|
|
+
|
|
+module_init(mcf_rtc_init);
|
|
+module_exit(mcf_rtc_exit);
|
|
+
|
|
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
|
|
+MODULE_DESCRIPTION("Real Time Clock Driver (MCF)");
|
|
+MODULE_LICENSE("GPL V2");
|