mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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7e7649baa9
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@31546 3c298f89-4303-0410-b956-a3cf2f4a3e73
628 lines
17 KiB
Diff
628 lines
17 KiB
Diff
From 40563ab5aa698191dbd8a05fe6053aa790eee2a1 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 26/52] Add RTC driver support for MCF5445x
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On-chip RTC module support for MCF54451 and MCF54455.
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Using internal 32K clock to drive the rtc module.
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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-mcf.c | 583 +++++++++++++++++++++++++++++++++++++++++++++++++
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3 files changed, 593 insertions(+), 0 deletions(-)
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create mode 100644 drivers/rtc/rtc-mcf.c
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--- a/drivers/rtc/Kconfig
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+++ b/drivers/rtc/Kconfig
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@@ -919,6 +919,15 @@ config RTC_DRV_MV
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This driver can also be built as a module. If so, the module
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will be called rtc-mv.
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+config RTC_MCF
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+ tristate "Freescale Coldfire 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.
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+
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+ If you build it as a module it will be call mcf-rtc.
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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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@@ -102,3 +102,4 @@ obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41
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obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o
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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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--- /dev/null
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+++ b/drivers/rtc/rtc-mcf.c
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@@ -0,0 +1,583 @@
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+/*
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+ * Copyright (C) 2004-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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+ *
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+ * Implementation based on rtc-mxc.c
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+ * This file contains Real Time Clock interface for Linux.
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+ *
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+ * This is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU General Public License as published by
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+ * the Free Software Foundation; either version 2 of the License, or
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+ * (at your option) any later version.
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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 readl
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+#undef readl
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+#endif
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+
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+#ifdef writel
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+#undef writel
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+#endif
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+
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+#define readl(addr) in_be32(addr)
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+#define writel(val, addr) out_be32((addr), (val))
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+
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+#define RTC_INPUT_CLK_32768HZ 0x8000
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+#define RTC_INPUT_CLK_32000HZ 0x7D00
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+#define RTC_INPUT_CLK_38400HZ 0x9600
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+#define RTC_INPUT_CLK_48000HZ 0xBB80
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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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+/*!
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+ * @defgroup RTC Real Time Clock (RTC) Driver
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+ */
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+/*!
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+ * @file rtc-mcf.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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+ * @ingroup RTC
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+ */
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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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+ * 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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+{
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+ u32 day, hr, min, sec, hr_min;
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+
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+ if (time_alarm == MCF_RTC_TIME) {
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+ day = MCF_RTC_DAYS_DAYS(readl(MCF_RTC_DAYS));
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+ hr_min = readl(MCF_RTC_HOURMIN);
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+ sec = MCF_RTC_SECONDS_SECONDS(readl(MCF_RTC_SECONDS));
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+ } else if (time_alarm == MCF_RTC_ALARM) {
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+ day = MCF_RTC_ALRM_DAY_DAYS(readl(MCF_RTC_ALRM_DAY));
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+ hr_min = readl(MCF_RTC_ALRM_HM);
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+ sec = MCF_RTC_ALRM_SEC_SECONDS(readl(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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+ hr = (hr_min >> 8) & 0x001F;
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+ min = hr_min & 0x003F;
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+
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+ return (((day * 24 + hr) * 60) + min) * 60 + sec;
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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, u32 time)
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+{
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+ u32 day, hr, min, sec, temp;
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+
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+ day = time / 86400;
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+ time -= day * 86400;
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+ /* time is within a day now */
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+ hr = time / 3600;
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+ time -= hr * 3600;
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+ /* time is within an hour now */
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+ min = time / 60;
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+ sec = time - min * 60;
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+
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+ temp = (hr << 8) + min;
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+
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+ if (time_alarm == MCF_RTC_TIME) {
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+ writel(day, MCF_RTC_DAYS);
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+ writel(sec, MCF_RTC_SECONDS);
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+ writel(temp, MCF_RTC_HOURMIN);
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+ } else if (time_alarm == MCF_RTC_ALARM) {
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+ writel(day, MCF_RTC_ALRM_DAY);
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+ writel(sec, MCF_RTC_ALRM_SEC);
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+ writel(temp, MCF_RTC_ALRM_HM);
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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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+ struct rtc_time alarm_tm, now_tm;
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+ unsigned long now, time;
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+ int ret;
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+
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+ now = get_alarm_or_time(dev, MCF_RTC_TIME);
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+ rtc_time_to_tm(now, &now_tm);
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+ alarm_tm.tm_year = now_tm.tm_year;
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+ alarm_tm.tm_mon = now_tm.tm_mon;
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+ alarm_tm.tm_mday = now_tm.tm_mday;
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+ alarm_tm.tm_hour = alrm->tm_hour;
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+ alarm_tm.tm_min = alrm->tm_min;
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+ alarm_tm.tm_sec = alrm->tm_sec;
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+ rtc_tm_to_time(&now_tm, &now);
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+ rtc_tm_to_time(&alarm_tm, &time);
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+ if (time < now) {
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+ time += 60 * 60 * 24;
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+ rtc_time_to_tm(time, &alarm_tm);
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+ }
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+ ret = rtc_tm_to_time(&alarm_tm, &time);
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+
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+ /* clear all the interrupt status bits */
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+ writel(readl(MCF_RTC_ISR), MCF_RTC_ISR);
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+
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+ set_alarm_or_time(dev, MCF_RTC_ALARM, time);
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+
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+ return ret;
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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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+ u32 status, 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 = readl(MCF_RTC_ISR) & readl(MCF_RTC_IER);
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+ writel(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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+ writel(0, MCF_RTC_IER); /* Disable all rtc interrupts */
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+ writel(0x0000FFBF, MCF_RTC_ISR); /* Clear all interrupt status */
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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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+ switch (cmd) {
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+ case RTC_PIE_OFF:
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+ writel((readl(MCF_RTC_IER) & ~PIT_ALL_ON), MCF_RTC_IER);
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+ return 0;
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+ case RTC_IRQP_SET:
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+ if (arg < 2 || arg > MAX_PIE_FREQ || (arg % 2) != 0)
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+ return -EINVAL; /* Also make sure a power of 2Hz */
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+ if ((arg > 64) && (!capable(CAP_SYS_RESOURCE)))
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+ return -EACCES;
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+ rtc_freq = arg;
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+ return 0;
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+ case RTC_IRQP_READ:
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+ return put_user(rtc_freq, (u32 *) arg);
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+ case RTC_PIE_ON:
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+ for (i = 0; i < MAX_PIE_NUM; i++) {
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+ if (PIE_BIT_DEF[i][0] == rtc_freq)
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+ break;
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+ }
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+ if (i == MAX_PIE_NUM)
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+ return -EACCES;
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+ spin_lock_irq(&rtc_lock);
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+ writel((readl(MCF_RTC_IER) | PIE_BIT_DEF[i][1]), MCF_RTC_IER);
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+ spin_unlock_irq(&rtc_lock);
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+ return 0;
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+ case RTC_AIE_OFF:
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+ spin_lock_irq(&rtc_lock);
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+ writel((readl(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM), MCF_RTC_IER);
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+ spin_unlock_irq(&rtc_lock);
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+ return 0;
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+
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+ case RTC_AIE_ON:
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+ spin_lock_irq(&rtc_lock);
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+ writel((readl(MCF_RTC_IER) | MCF_RTC_ISR_ALM), MCF_RTC_IER);
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+ spin_unlock_irq(&rtc_lock);
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+ return 0;
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+
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+ case RTC_UIE_OFF: /* UIE is for the 1Hz interrupt */
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+ spin_lock_irq(&rtc_lock);
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+ writel((readl(MCF_RTC_IER) & ~MCF_RTC_ISR_1HZ), MCF_RTC_IER);
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+ spin_unlock_irq(&rtc_lock);
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+ return 0;
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+
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+ case RTC_UIE_ON:
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+ spin_lock_irq(&rtc_lock);
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+ writel((readl(MCF_RTC_IER) | MCF_RTC_ISR_1HZ), MCF_RTC_IER);
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+ spin_unlock_irq(&rtc_lock);
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+ return 0;
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+ }
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+ return -ENOIOCTLCMD;
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+}
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+
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+/*!
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+ * This function reads the current RTC time into tm in Gregorian date.
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+ *
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+ * @param tm contains the RTC time value upon return
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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 mcf_rtc_read_time(struct device *dev, struct rtc_time *tm)
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+{
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+ u32 val;
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+
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+ /* Avoid roll-over from reading the different registers */
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+ do {
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+ val = get_alarm_or_time(dev, MCF_RTC_TIME);
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+ } while (val != get_alarm_or_time(dev, MCF_RTC_TIME));
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+
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+ rtc_time_to_tm(val, tm);
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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 internal RTC time based on tm in Gregorian date.
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+ *
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+ * @param tm the time value to be set 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 mcf_rtc_set_time(struct device *dev, struct rtc_time *tm)
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+{
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+ unsigned long time;
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+ int ret;
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+
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+ ret = rtc_tm_to_time(tm, &time);
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+ if (ret != 0)
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+ return ret;
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+
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+ /* Avoid roll-over from reading the different registers */
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+ do {
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+ set_alarm_or_time(dev, MCF_RTC_TIME, time);
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+ } while (time != get_alarm_or_time(dev, MCF_RTC_TIME));
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+
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+ return ret;
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+}
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+
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+/*!
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+ * This function reads the current alarm value into the passed in \b alrm
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+ * argument. It updates the \b alrm's pending field value based on the whether
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+ * an alarm interrupt occurs or not.
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+ *
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+ * @param alrm contains the RTC alarm value upon return
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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 mcf_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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+{
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+ rtc_time_to_tm(get_alarm_or_time(dev, MCF_RTC_ALARM), &alrm->time);
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+ alrm->pending = ((readl(MCF_RTC_ISR) & MCF_RTC_ISR_ALM) != 0) ? 1 : 0;
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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 based on passed in alrm.
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+ *
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+ * @param alrm the alarm value to be set 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 mcf_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
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+{
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+ int ret;
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+
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+ spin_lock_irq(&rtc_lock);
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+ if (rtc_valid_tm(&alrm->time)) {
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+ 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) {
|
|
+ writel((readl(MCF_RTC_IER) | MCF_RTC_ISR_ALM),
|
|
+ MCF_RTC_IER);
|
|
+ } else {
|
|
+ writel((readl(MCF_RTC_IER) & ~MCF_RTC_ISR_ALM),
|
|
+ MCF_RTC_IER);
|
|
+ }
|
|
+ }
|
|
+out:
|
|
+ spin_unlock_irq(&rtc_lock);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * This function is used to provide the content for the /proc/driver/rtc
|
|
+ * file.
|
|
+ *
|
|
+ * @param buf the buffer to hold the information that the driver
|
|
+ * wants to write
|
|
+ *
|
|
+ * @return The number of bytes written into the rtc file.
|
|
+ */
|
|
+static int mcf_rtc_proc(struct device *dev, struct seq_file *sq)
|
|
+{
|
|
+ char *p = sq->buf;
|
|
+
|
|
+ p += sprintf(p, "alarm_IRQ\t: %s\n",
|
|
+ (((readl(MCF_RTC_IER)) & MCF_RTC_ISR_ALM) !=
|
|
+ 0) ? "yes" : "no");
|
|
+ p += sprintf(p, "update_IRQ\t: %s\n",
|
|
+ (((readl(MCF_RTC_IER)) & MCF_RTC_ISR_1HZ) !=
|
|
+ 0) ? "yes" : "no");
|
|
+ p += sprintf(p, "periodic_IRQ\t: %s\n",
|
|
+ (((readl(MCF_RTC_IER)) & PIT_ALL_ON) !=
|
|
+ 0) ? "yes" : "no");
|
|
+ p += sprintf(p, "periodic_freq\t: %d\n", rtc_freq);
|
|
+
|
|
+ return p - (sq->buf);
|
|
+}
|
|
+
|
|
+/*!
|
|
+ * 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,
|
|
+ .proc = mcf_rtc_proc,
|
|
+};
|
|
+
|
|
+static int __devinit mcf_rtc_probe(struct platform_device *pdev)
|
|
+{
|
|
+ struct timespec tv;
|
|
+ struct rtc_device *rtc;
|
|
+ struct rtc_plat_data *pdata = NULL;
|
|
+ u32 ret = 0;
|
|
+
|
|
+ pdata = kzalloc(sizeof(*pdata), GFP_KERNEL);
|
|
+ if (!pdata)
|
|
+ return -ENOMEM;
|
|
+ /* External clock is hard wired to 32768Hz.
|
|
+ * Clock settings 32K, 38.4K and 48K are defined above. */
|
|
+#if defined(CONFIG_M5227x) | defined(CONFIG_M5445X)
|
|
+ writel(0, MCF_RTC_GOCU);
|
|
+ writel(RTC_INPUT_CLK_32768HZ, MCF_RTC_GOCL);
|
|
+#endif
|
|
+ /* Configure and enable the RTC */
|
|
+ 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);
|
|
+
|
|
+ tv.tv_nsec = 0;
|
|
+ tv.tv_sec = get_alarm_or_time(&pdev->dev, MCF_RTC_TIME);
|
|
+
|
|
+#ifdef CONFIG_M5301x
|
|
+ writel(RTC_INPUT_CLK_32768HZ, MCF_RTC_GOC);
|
|
+ writel(0x08, MCF_RTC_OCEN);
|
|
+#endif
|
|
+ writeb(4, MCFSIM_ICR_RTC);
|
|
+
|
|
+ writel(MCF_RTC_IER_1HZ, MCF_RTC_IER); /* Unmask the 1Hz timer */
|
|
+
|
|
+ writel(MCF_RTC_CR_EN, MCF_RTC_CR);
|
|
+ if ((readl(MCF_RTC_CR) & MCF_RTC_CR_EN) == 0) {
|
|
+ printk(KERN_ALERT "RTC Hardware couldn't be enabled!\n");
|
|
+ return -EPERM;
|
|
+ }
|
|
+
|
|
+ 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("mcf-rtc");
|
|
+static struct platform_driver mcf_rtc_driver = {
|
|
+ .driver = {
|
|
+ .name = "mcf-rtc",
|
|
+ .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");
|