Message-ID: <1418757750-3628-1-git-send-email-arun.ramamurthy@broadcom.com>
Date:	Tue, 16 Dec 2014 11:22:30 -0800
From:	<arun.ramamurthy@...adcom.com>
To:	<a.zummo@...ertech.it>, <rtc-linux@...glegroups.com>
CC:	<robh+dt@...nel.org>, <pawel.moll@....com>, <mark.rutland@....com>,
	<ijc+devicetree@...lion.org.uk>, <galak@...eaurora.org>,
	<rjui@...adcom.com>, <sbranden@...adcom.com>,
	<grant.likely@...aro.org>, <devicetree@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	<linux-kernel@...r.kernel.org>,
	Arun Ramamurthy <arunrama@...adcom.com>
Subject: [PATCHv1] rtc: bcm-iproc: Add support for Broadcom iproc rtc

From: Arun Ramamurthy <arunrama@...adcom.com>

Adding support for the RTC module used in Broadcom's
iproc architecture

Changes in v1:
	Resending patch to larger distribution

Signed-off-by: Arun Ramamurthy <arunrama@...adcom.com>
Reviewed-by: Ray Jui <rjui@...adcom.com>
Reviewed-by: Scott Branden <sbranden@...adcom.com>
Tested-by: Scott Branden <sbranden@...adcom.com>
---
 .../devicetree/bindings/rtc/brcm,iproc-rtc.txt     |  26 +
 drivers/rtc/Kconfig                                |  11 +
 drivers/rtc/Makefile                               |   1 +
 drivers/rtc/rtc-bcm-iproc.c                        | 613 +++++++++++++++++++++
 4 files changed, 651 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/brcm,iproc-rtc.txt
 create mode 100644 drivers/rtc/rtc-bcm-iproc.c

diff --git a/Documentation/devicetree/bindings/rtc/brcm,iproc-rtc.txt b/Documentation/devicetree/bindings/rtc/brcm,iproc-rtc.txt
new file mode 100644
index 0000000..f9b354b
--- /dev/null
+++ b/Documentation/devicetree/bindings/rtc/brcm,iproc-rtc.txt
@@ -0,0 +1,26 @@
+Broadcom IPROC Real Time Clock
+
+Required Properties:
+- compatible: should be "brcm,iproc-rtc"
+
+- reg :  Requires three separate register sets.
+	spru_bbl: Base address of SPRU_BBL_WDATA used for
+		  indirect access to RTC registers
+	crmu_pwr_good_status: Base address of CRMU_PWR_GOOD_STATUS register,
+			      used to check power status of BBL
+			      (battery backed logic)
+	crum_bbl_auth: Base address of CRMU_BBL_AUTH_CODE register.
+
+- interrupts: RTC Periodic interrupt and RTC Alarm interrupt.
+
+
+Example:
+	rtc: iproc_rtc@...3026000 {
+		compatible = "brcm,iproc-rtc";
+		reg =	spru_bbl:		<0x03026000 0xC>,
+			crmu_pwr_good_status:	<0x0301C02C 0x14>,
+			crmu_bbl_auth:		<0x03024C74 0x8>;
+		interrupts = spru_rtc_periodic: <GIC_SPI 142 IRQ_TYPE_LEVEL_HIGH>,
+			     spru_alarm:	<GIC_SPI 133 IRQ_TYPE_LEVEL_HIGH>;
+		status = "disabled";
+	};
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 4511ddc..0a3fd03 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1426,6 +1426,17 @@ config RTC_DRV_XGENE
 	  This driver can also be built as a module, if so, the module
 	  will be called "rtc-xgene".
 
+config RTC_DRV_IPROC
+	tristate "IPROC RTC support"
+	depends on ARCH_BCM
+	default ARCH_BCM_IPROC
+	help
+	  If you say yes here you get support for Broadcom IPROC RTC subsystem.
+	  If unsure, say N.
+
+	  This driver can also be built as a module, if so, the module
+	  will be called "rtc-bcm-iproc"
+
 comment "HID Sensor RTC drivers"
 
 config RTC_DRV_HID_SENSOR_TIME
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index b188323..eca6560 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -64,6 +64,7 @@ obj-$(CONFIG_RTC_DRV_GENERIC)	+= rtc-generic.o
 obj-$(CONFIG_RTC_DRV_HID_SENSOR_TIME) += rtc-hid-sensor-time.o
 obj-$(CONFIG_RTC_DRV_HYM8563)	+= rtc-hym8563.o
 obj-$(CONFIG_RTC_DRV_IMXDI)	+= rtc-imxdi.o
+obj-$(CONFIG_RTC_DRV_IPROC)	+= rtc-bcm-iproc.o
 obj-$(CONFIG_RTC_DRV_ISL1208)	+= rtc-isl1208.o
 obj-$(CONFIG_RTC_DRV_ISL12022)	+= rtc-isl12022.o
 obj-$(CONFIG_RTC_DRV_ISL12057)	+= rtc-isl12057.o
diff --git a/drivers/rtc/rtc-bcm-iproc.c b/drivers/rtc/rtc-bcm-iproc.c
new file mode 100644
index 0000000..fe29b94
--- /dev/null
+++ b/drivers/rtc/rtc-bcm-iproc.c
@@ -0,0 +1,613 @@
+/*
+ * Copyright (C) 2014 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation version 2.
+ *
+ * This program is distributed "as is" WITHOUT ANY WARRANTY of any
+ * kind, whether express or implied; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/ioport.h>
+#include <linux/delay.h>
+#include <linux/spinlock.h>
+#include <linux/rtc.h>
+#include <linux/bcd.h>
+#include <linux/platform_device.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/bitops.h>
+
+/***********************************************************************
+ * Definitions
+ ***********************************************************************/
+#define IREG_BBL_RTC_PER		0x00000000
+#define IREG_BBL_RTC_MATCH		0x00000004
+#define IREG_BBL_RTC_DIV		0x00000008
+#define IREG_BBL_RTC_SECOND		0x0000000C
+#define IREG_BBL_INTERRUPT_EN		0x00000010
+#define IREG_BBL_INTERRUPT_STAT		0x00000014
+#define IREG_BBL_INTERRUPT_CLR		0x00000018
+#define IREG_BBL_CONTROL		0x0000001C
+#define IREG_BBL_ADDR_MASK		0x3FF
+
+#define BBL_PER_1s	0x00000008
+
+#define CRMU_AUTH_CODE_PWD	0x12345678
+#define CRMU_AUTH_CODE_PWD_RST	0x99999999
+#define CRMU_AUTH_CODE_PWD_CLR	0x0
+
+#define RTC_REG_ACC_DONE	BIT(0)
+#define RTC_REG_RTC_STOP	BIT(0)
+#define RTC_REG_PERIO_INTR	BIT(0)
+#define RTC_REG_ALARM_INTR	BIT(1)
+#define RTC_IND_SOFT_RST_N	BIT(10)
+#define RTC_REG_WR_CMD		BIT(11)
+#define RTC_REG_RD_CMD		BIT(12)
+#define CRMU_ISO_PDBBL		BIT(16)
+#define CRMU_ISO_PDBBL_TAMPER	BIT(24)
+
+/* Timeout when waiting on register
+reads or writes */
+#define REG_TIMEOUT_MICROSECONDS 250
+
+/*  SPRU Source Select status
+	   0 - SPRU is powered by AON power
+	   1 - SPRU is powerd by battery */
+#define CRMU_SPRU_SOURCE_SEL_AON 0
+
+struct rtc_regs_t {
+	u32 SPRU_BBL_WDATA;
+	u32 SPRU_BBL_CMD;
+	u32 SPRU_BBL_STATUS;
+	u32 SPRU_BBL_RDATA;
+};
+
+struct crmu_regs_t {
+	u32 CRMU_PWR_GOOD_STATUS;
+	u32 CRMU_POWER_REQ_CFG;
+	u32 CRMU_POWER_POLL;
+	u32 CRMU_ISO_CELL_CONTROL;
+	u32 rsvd;
+	u32 CRMU_SPRU_SOURCE_SEL_STAT;
+};
+
+struct bbl_auth_t {
+	u32 CRMU_BBL_AUTH_CODE;
+	u32 CRMU_BBL_AUTH_CHECK;
+};
+
+struct iproc_rtc_t {
+	struct rtc_device *rtc;
+	struct rtc_regs_t *regs;
+	struct crmu_regs_t *crmu_regs;
+	struct bbl_auth_t *auth_regs;
+	int periodic_irq;
+	int alarm_irq;
+	spinlock_t lock;
+};
+/***********************************************************************
+ *  End Definitions
+ ***********************************************************************/
+
+static inline int wait_acc_done(struct iproc_rtc_t *iproc_rtc)
+{
+	u32 reg_val;
+	int timeout = REG_TIMEOUT_MICROSECONDS;
+
+	reg_val = readl(&iproc_rtc->regs->SPRU_BBL_STATUS);
+	while (!(reg_val & RTC_REG_ACC_DONE)) {
+		if (--timeout == 0)
+			return -EIO;
+		udelay(1);
+		reg_val = readl(&iproc_rtc->regs->SPRU_BBL_STATUS);
+	}
+
+	return 0;
+}
+
+static inline int rtc_reg_write(u32 reg_addr, u32 reg_val,
+				struct iproc_rtc_t *iproc_rtc)
+{
+	u32 cmd;
+	int ret;
+
+	writel(reg_val, &iproc_rtc->regs->SPRU_BBL_WDATA);
+	/* Write command */
+	cmd = (reg_addr & IREG_BBL_ADDR_MASK) |
+		RTC_REG_WR_CMD | RTC_IND_SOFT_RST_N;
+	writel(cmd, &iproc_rtc->regs->SPRU_BBL_CMD);
+	ret = wait_acc_done(iproc_rtc);
+	if (ret < 0)
+		pr_err("RTC: reg write to 0x%x failed!", reg_addr);
+
+	return ret;
+}
+
+static inline int rtc_reg_read(u32 reg_addr, u32 *data,
+				struct iproc_rtc_t *iproc_rtc)
+{
+	u32 cmd;
+	int ret;
+
+	/* Read command */
+	cmd = (reg_addr & IREG_BBL_ADDR_MASK) |
+		RTC_REG_RD_CMD | RTC_IND_SOFT_RST_N;
+	writel(cmd, &iproc_rtc->regs->SPRU_BBL_CMD);
+	ret = wait_acc_done(iproc_rtc);
+	if (ret < 0)
+		pr_err("RTC: reg read to 0x%x failed", reg_addr);
+	else
+		*data = readl(&iproc_rtc->regs->SPRU_BBL_RDATA);
+
+	return ret;
+}
+
+static int bbl_init(struct iproc_rtc_t *iproc_rtc)
+{
+	u32 reg_val;
+	int timeout = REG_TIMEOUT_MICROSECONDS;
+
+	/* Check SPRU Source Select status
+	   0 - SPRU is powered by AON power
+	   1 - SPRU is powerd by battery */
+	reg_val = readl(&iproc_rtc->crmu_regs->CRMU_SPRU_SOURCE_SEL_STAT);
+	while (reg_val != CRMU_SPRU_SOURCE_SEL_AON) {
+		if (--timeout == 0) {
+			pr_info("RTC: BBL AON power not available\n");
+			return -ENODEV;
+		}
+		udelay(1);
+		reg_val = readl(
+			&iproc_rtc->crmu_regs->CRMU_SPRU_SOURCE_SEL_STAT);
+	}
+
+	/* Wait for reset cycle */
+	writel(0, &iproc_rtc->regs->SPRU_BBL_CMD);
+	udelay(200);
+	writel(RTC_IND_SOFT_RST_N, &iproc_rtc->regs->SPRU_BBL_CMD);
+
+	/* Remove BBL related isolation from CRMU */
+	reg_val = readl(&iproc_rtc->crmu_regs->CRMU_ISO_CELL_CONTROL);
+	reg_val &= ~(CRMU_ISO_PDBBL | CRMU_ISO_PDBBL_TAMPER);
+	writel(reg_val, &iproc_rtc->crmu_regs->CRMU_ISO_CELL_CONTROL);
+
+	/* program CRMU auth_code resister */
+	writel(CRMU_AUTH_CODE_PWD, &iproc_rtc->auth_regs->CRMU_BBL_AUTH_CODE);
+	/* program CRMU auth_code_check register */
+	/* auth_code must equal to auth_code_check */
+	writel(CRMU_AUTH_CODE_PWD, &iproc_rtc->auth_regs->CRMU_BBL_AUTH_CHECK);
+
+	return 0;
+}
+
+static void bbl_exit(struct iproc_rtc_t *iproc_rtc)
+{
+	u32 reg_val;
+
+	/*- Set BBL related isolation from CRMU */
+	reg_val = readl(&iproc_rtc->crmu_regs->CRMU_ISO_CELL_CONTROL);
+	reg_val |= (CRMU_ISO_PDBBL | CRMU_ISO_PDBBL_TAMPER);
+	writel(reg_val, &iproc_rtc->crmu_regs->CRMU_ISO_CELL_CONTROL);
+
+	/* Change the AUTH CODE register so it does not match
+	 * the AUTH_CHECK register */
+	writel(CRMU_AUTH_CODE_PWD_CLR,
+	       &iproc_rtc->auth_regs->CRMU_BBL_AUTH_CODE);
+	writel(CRMU_AUTH_CODE_PWD_RST,
+	       &iproc_rtc->auth_regs->CRMU_BBL_AUTH_CHECK);
+}
+static int iproc_rtc_enable(struct iproc_rtc_t *iproc_rtc)
+{
+	u32 reg_val;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+
+	/* Set periodic timer as 1 second */
+	ret = rtc_reg_write(IREG_BBL_RTC_PER, BBL_PER_1s, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	ret = rtc_reg_read(IREG_BBL_INTERRUPT_EN, &reg_val, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	/* Disable alarm&periodic interrupt */
+	reg_val &= ~(RTC_REG_PERIO_INTR | RTC_REG_ALARM_INTR);
+
+	ret = rtc_reg_write(IREG_BBL_INTERRUPT_EN, reg_val, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	ret = rtc_reg_write(IREG_BBL_INTERRUPT_CLR,
+		RTC_REG_PERIO_INTR | RTC_REG_ALARM_INTR, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	reg_val |= RTC_REG_PERIO_INTR | RTC_REG_ALARM_INTR;
+	/* enable RTC periodic interrupt */
+	ret = rtc_reg_write(IREG_BBL_INTERRUPT_EN, reg_val, iproc_rtc);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	return ret;
+}
+
+static int iproc_rtc_disable(struct iproc_rtc_t *iproc_rtc)
+{
+	u32 reg_val;
+	unsigned long flags;
+	int ret = 0;
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+
+	ret = rtc_reg_read(IREG_BBL_INTERRUPT_EN, &reg_val, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	reg_val &= ~(RTC_REG_PERIO_INTR | RTC_REG_ALARM_INTR);
+	/* To disable RTC periodic interrupt */
+	ret = rtc_reg_write(IREG_BBL_INTERRUPT_EN, reg_val, iproc_rtc);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	return ret;
+}
+
+static irqreturn_t iproc_rtc_interrupt(int irq, void *class_dev)
+{
+	unsigned long flags, events = 0;
+	u32 reg_val, irq_flg;
+	int ret = 0;
+	struct iproc_rtc_t *iproc_rtc =  class_dev;
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+	ret = rtc_reg_read(IREG_BBL_INTERRUPT_STAT, &irq_flg, iproc_rtc);
+	if (ret < 0) {
+		pr_err("RTC: Interrupt Routine failed");
+		goto err;
+	}
+
+	irq_flg &= RTC_REG_PERIO_INTR | RTC_REG_ALARM_INTR;
+	if (!irq_flg)
+		goto err;
+
+	if (irq_flg & RTC_REG_PERIO_INTR) {
+		/* Clear periodic interrupt status */
+		ret = rtc_reg_write(IREG_BBL_INTERRUPT_CLR, RTC_REG_PERIO_INTR,
+					iproc_rtc);
+		if (ret < 0)
+			pr_err("RTC: Failed to clear RTC periodic interrupt event");
+		events |= RTC_IRQF | RTC_PF;
+	}
+
+	if (irq_flg & RTC_REG_ALARM_INTR) {
+		/* Clear alarm interrupt status */
+		ret = rtc_reg_write(IREG_BBL_INTERRUPT_CLR, RTC_REG_ALARM_INTR,
+					iproc_rtc);
+		if (ret < 0)
+			pr_err("RTC: Failed to clear RTC Alarm interrupt event");
+		events |= RTC_IRQF | RTC_AF;
+
+		ret = rtc_reg_read(IREG_BBL_INTERRUPT_EN, &reg_val, iproc_rtc);
+		if (ret < 0) {
+			pr_err("RTC: Failed to disable RTC Alarm interrupt after clear");
+			goto err;
+		}
+		reg_val &= ~RTC_REG_ALARM_INTR;
+		 /* Disable Alarm interrupt */
+		ret = rtc_reg_write(IREG_BBL_INTERRUPT_EN, reg_val, iproc_rtc);
+		if (ret < 0) {
+			pr_err("RTC: Failed to disable RTC Alarm interrupt after clear");
+			goto err;
+		}
+	}
+
+err:
+	if (events)
+		rtc_update_irq(iproc_rtc->rtc, 1, events);
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	return IRQ_HANDLED;
+}
+
+static int iproc_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	unsigned long flags;
+	u32 seconds;
+	int ret = 0;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+
+	ret = rtc_reg_read(IREG_BBL_RTC_SECOND, &seconds, iproc_rtc);
+	if (ret < 0) {
+		pr_err("RTC: iproc_rtc_read_time failed");
+		goto err;
+	}
+	rtc_time_to_tm(seconds, tm);
+
+	ret = rtc_valid_tm(tm);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	return ret;
+}
+
+static int iproc_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	unsigned long flags, seconds;
+	int ret = 0;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	rtc_tm_to_time(tm, &seconds);
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+
+	/* bbl_rtc_stop = 1, RTC hal */
+	ret = rtc_reg_write(IREG_BBL_CONTROL, RTC_REG_RTC_STOP, iproc_rtc);
+	if (ret < 0)
+		goto err;
+	/* Update DIV */
+	ret = rtc_reg_write(IREG_BBL_RTC_DIV, 0, iproc_rtc);
+	if (ret < 0)
+		goto err;
+	/* Update second */
+	ret = rtc_reg_write(IREG_BBL_RTC_SECOND, seconds, iproc_rtc);
+	if (ret < 0)
+		goto err;
+	/* bl_rtc_stop = 0, RTC release */
+	ret = rtc_reg_write(IREG_BBL_CONTROL, ~RTC_REG_RTC_STOP, iproc_rtc);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	if (ret < 0)
+		pr_err("RTC: iproc_rtc_set_time failed");
+	return ret;
+}
+
+static int iproc_rtc_alarm_irq_enable(struct device *dev,
+					unsigned int enabled)
+{
+	unsigned long flags;
+	u32 reg_val;
+	int ret = 0;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+	ret = rtc_reg_read(IREG_BBL_INTERRUPT_EN, &reg_val, iproc_rtc);
+	if (ret < 0)
+		goto err;
+
+	if (enabled)
+		reg_val |= RTC_REG_ALARM_INTR;
+	else
+		reg_val &= ~RTC_REG_ALARM_INTR;
+
+	ret = rtc_reg_write(IREG_BBL_INTERRUPT_EN, reg_val, iproc_rtc);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	if (ret < 0)
+		pr_err("RTC: iproc_rtc_alarm_irq_enable failed");
+	return ret;
+}
+
+static int iproc_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	unsigned long flags;
+	u32 reg_val, seconds;
+	int ret = 0;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+	ret = rtc_reg_read(IREG_BBL_RTC_MATCH, &seconds, iproc_rtc);
+	if (ret < 0)
+		goto err;
+	seconds = (seconds << 7);
+	rtc_time_to_tm(seconds, &alm->time);
+	ret = rtc_reg_read(IREG_BBL_INTERRUPT_EN, &reg_val, iproc_rtc);
+	if (ret < 0)
+		goto err;
+	reg_val &= RTC_REG_ALARM_INTR;
+	alm->pending = !reg_val;
+	alm->enabled = alm->pending && device_may_wakeup(dev);
+
+err:
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	if (ret < 0)
+		pr_err("RTC: iproc_rtc_read_alarm failed");
+	return ret;
+}
+
+static int iproc_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm)
+{
+	unsigned long flags;
+	unsigned long seconds;
+	int ret = 0;
+	struct platform_device *pdev = to_platform_device(dev);
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	spin_lock_irqsave(&iproc_rtc->lock, flags);
+	rtc_tm_to_time(&alm->time, &seconds);
+	seconds = ((seconds & (0xFFFF << 7)) >> 7) & 0xFFFF;
+	ret = rtc_reg_write(IREG_BBL_RTC_MATCH, seconds, iproc_rtc);
+	spin_unlock_irqrestore(&iproc_rtc->lock, flags);
+	if (ret < 0)
+		pr_err("RTC: iproc_rtc_set_alarm failed");
+
+	return ret;
+}
+
+static struct rtc_class_ops iproc_rtc_ops = {
+	.read_time		= iproc_rtc_read_time,
+	.set_time		= iproc_rtc_set_time,
+	.alarm_irq_enable	= iproc_rtc_alarm_irq_enable,
+	.read_alarm		= iproc_rtc_read_alarm,
+	.set_alarm		= iproc_rtc_set_alarm,
+};
+
+static const struct of_device_id iproc_rtc_of_match[] = {
+	{.compatible = "brcm,iproc-rtc",},
+	{ }
+};
+
+static int iproc_rtc_probe(struct platform_device *pdev)
+{
+	struct device_node *dev_of = pdev->dev.of_node;
+	struct resource *res;
+	int ret = 0;
+	struct iproc_rtc_t *iproc_rtc;
+
+	iproc_rtc = devm_kzalloc(&pdev->dev, sizeof(struct iproc_rtc_t),
+				 GFP_KERNEL);
+	spin_lock_init(&iproc_rtc->lock);
+
+	iproc_rtc->periodic_irq = irq_of_parse_and_map(dev_of, 0);
+	if (iproc_rtc->periodic_irq < 0) {
+		dev_err(&pdev->dev, "no RTC periodic irq\n");
+		ret = -ENODEV;
+		goto fail;
+	}
+
+	iproc_rtc->alarm_irq = irq_of_parse_and_map(dev_of, 1);
+	if (iproc_rtc->alarm_irq < 0) {
+		dev_err(&pdev->dev, "no RTC alarm irq\n");
+		ret = -ENODEV;
+		goto fail;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "spru_bbl MEM resource missing\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+	iproc_rtc->regs = (struct rtc_regs_t *)
+		devm_ioremap_resource(&pdev->dev, res);
+	if (!iproc_rtc->regs) {
+		dev_err(&pdev->dev, "unable to ioremap spru_bbl MEM resource\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "crmu_pwr_good MEM resource missing\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+	iproc_rtc->crmu_regs = (struct crmu_regs_t *)
+		devm_ioremap_resource(&pdev->dev, res);
+	if (!iproc_rtc->crmu_regs) {
+		dev_err(&pdev->dev, "unable to ioremap crmu_pwr_good MEM resource\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+	if (res == NULL) {
+		dev_err(&pdev->dev, "crmu_bbl_auth MEM resource missing\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+	iproc_rtc->auth_regs = (struct bbl_auth_t *)
+		devm_ioremap_resource(&pdev->dev, res);
+	if (!iproc_rtc->auth_regs) {
+		dev_err(&pdev->dev, "unable to ioremap crmu_bbl_auth MEM resource\n");
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	platform_set_drvdata(pdev, iproc_rtc);
+
+	ret = bbl_init(iproc_rtc);
+	if (ret < 0)
+		goto fail;
+
+	ret = iproc_rtc_enable(iproc_rtc);
+	if (ret < 0) {
+		pr_err("RTC: Enable failed");
+		goto fail_bbl;
+	}
+
+	ret = devm_request_irq
+		(&pdev->dev, iproc_rtc->periodic_irq, iproc_rtc_interrupt,
+		 IRQF_SHARED, "iproc_rtc_peri", iproc_rtc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to register iproc RTC periodic interrupt\n");
+		goto fail_rtc;
+	}
+
+	ret = devm_request_irq
+		(&pdev->dev, iproc_rtc->alarm_irq, iproc_rtc_interrupt, 0,
+		"iproc_rtc_alarm", iproc_rtc);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "unable to register iproc RTC alarm interrupt\n");
+		goto fail_rtc;
+	}
+
+	iproc_rtc->rtc =  devm_rtc_device_register(&pdev->dev, "iproc-rtc",
+			&iproc_rtc_ops, THIS_MODULE);
+	if (IS_ERR(iproc_rtc->rtc)) {
+		dev_err(&pdev->dev, "unable to register RTC device, err %ld\n",
+				PTR_ERR(iproc_rtc->rtc));
+		ret = PTR_ERR(iproc_rtc->rtc);
+		goto fail_rtc;
+	}
+
+	device_init_wakeup(&pdev->dev, 1);
+	return 0;
+
+fail_rtc:
+	iproc_rtc_disable(iproc_rtc);
+fail_bbl:
+	bbl_exit(iproc_rtc);
+fail:
+	platform_set_drvdata(pdev, NULL);
+	return ret;
+}
+
+static int iproc_rtc_remove(struct platform_device *pdev)
+{
+	int ret = 0;
+	struct iproc_rtc_t *iproc_rtc = platform_get_drvdata(pdev);
+
+	device_init_wakeup(&pdev->dev, 0);
+	rtc_device_unregister(iproc_rtc->rtc);
+	ret = iproc_rtc_disable(iproc_rtc);
+	if (ret < 0)
+		pr_err("RTC: Disable failed");
+	bbl_exit(iproc_rtc);
+	platform_set_drvdata(pdev, NULL);
+
+	return 0;
+}
+
+static struct platform_driver iproc_rtc_driver = {
+	.probe		= iproc_rtc_probe,
+	.remove		= iproc_rtc_remove,
+	.driver		= {
+		.name = "iproc-rtc",
+		.of_match_table = iproc_rtc_of_match
+	},
+};
+
+module_platform_driver(iproc_rtc_driver);
+
+MODULE_AUTHOR("Broadcom");
+MODULE_DESCRIPTION("Broadcom IPROC RTC Driver");
+MODULE_LICENSE("GPL");
-- 
2.2.0

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