rtc: Add drivers/rtc/rtc-mrst.c
Provide the standard kernel rtc driver interface on top of the vrtc layer added in the previous patch. Signed-off-by: Feng Tang <feng.tang@intel.com> LKML-Reference: <20101110172911.3311.20593.stgit@localhost.localdomain> [Fixed swapped arguments on IPC] Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> [Cleaned up and the device creation moved to arch/x86/platform] Signed-off-by: Alan Cox <alan@linux.intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Feng Tang
Thomas Gleixner
parent
7309282c90
commit
0146f26145
4 changed files with 637 additions and 0 deletions
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@ -20,6 +20,7 @@
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/sfi.h>
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#include <linux/platform_device.h>
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#include <asm/mrst.h>
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#include <asm/mrst-vrtc.h>
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@ -118,3 +119,48 @@ void __init mrst_rtc_init(void)
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x86_platform.get_wallclock = vrtc_get_time;
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x86_platform.set_wallclock = vrtc_set_mmss;
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}
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/*
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* The Moorestown platform has a memory mapped virtual RTC device that emulates
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* the programming interface of the RTC.
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*/
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static struct resource vrtc_resources[] = {
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[0] = {
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.flags = IORESOURCE_MEM,
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},
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[1] = {
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.flags = IORESOURCE_IRQ,
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}
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};
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static struct platform_device vrtc_device = {
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.name = "rtc_mrst",
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.id = -1,
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.resource = vrtc_resources,
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.num_resources = ARRAY_SIZE(vrtc_resources),
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};
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/* Register the RTC device if appropriate */
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static int __init mrst_device_create(void)
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{
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/* No Moorestown, no device */
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if (!mrst_identify_cpu())
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return -ENODEV;
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/* No timer, no device */
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if (!sfi_mrtc_num)
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return -ENODEV;
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/* iomem resource */
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vrtc_resources[0].start = sfi_mrtc_array[0].phys_addr;
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vrtc_resources[0].end = sfi_mrtc_array[0].phys_addr +
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MRST_VRTC_MAP_SZ;
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/* irq resource */
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vrtc_resources[1].start = sfi_mrtc_array[0].irq;
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vrtc_resources[1].end = sfi_mrtc_array[0].irq;
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platform_device_register(&vrtc_device);
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return 0;
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}
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module_init(mrst_device_create);
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@ -463,6 +463,18 @@ config RTC_DRV_CMOS
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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-cmos.
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config RTC_DRV_VRTC
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tristate "Virtual RTC for Moorestown platforms"
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depends on X86_MRST
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default y if X86_MRST
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help
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Say "yes" here to get direct support for the real time clock
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found on Moorestown platforms. The VRTC is a emulated RTC that
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derives its clock source from a real RTC in the PMIC. The MC146818
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style programming interface is mostly conserved, but any
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updates are done via IPC calls to the system controller FW.
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config RTC_DRV_DS1216
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tristate "Dallas DS1216"
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depends on SNI_RM
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@ -30,6 +30,7 @@ obj-$(CONFIG_RTC_DRV_CMOS) += rtc-cmos.o
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obj-$(CONFIG_RTC_DRV_COH901331) += rtc-coh901331.o
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obj-$(CONFIG_RTC_DRV_DAVINCI) += rtc-davinci.o
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obj-$(CONFIG_RTC_DRV_DM355EVM) += rtc-dm355evm.o
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obj-$(CONFIG_RTC_DRV_VRTC) += rtc-mrst.o
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obj-$(CONFIG_RTC_DRV_DS1216) += rtc-ds1216.o
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obj-$(CONFIG_RTC_DRV_DS1286) += rtc-ds1286.o
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obj-$(CONFIG_RTC_DRV_DS1302) += rtc-ds1302.o
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578
drivers/rtc/rtc-mrst.c
Normal file
578
drivers/rtc/rtc-mrst.c
Normal file
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@ -0,0 +1,578 @@
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/*
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* rtc-mrst.c: Driver for Moorestown virtual RTC
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*
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* (C) Copyright 2009 Intel Corporation
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* Author: Jacob Pan (jacob.jun.pan@intel.com)
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* Feng Tang (feng.tang@intel.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; version 2
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* of the License.
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*
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* Note:
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* VRTC is emulated by system controller firmware, the real HW
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* RTC is located in the PMIC device. SCU FW shadows PMIC RTC
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* in a memory mapped IO space that is visible to the host IA
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* processor.
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*
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* This driver is based upon drivers/rtc/rtc-cmos.c
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*/
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/*
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* Note:
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* * vRTC only supports binary mode and 24H mode
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* * vRTC only support PIE and AIE, no UIE, and its PIE only happens
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* at 23:59:59pm everyday, no support for adjustable frequency
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* * Alarm function is also limited to hr/min/sec.
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*/
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#include <linux/mod_devicetable.h>
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#include <linux/platform_device.h>
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#include <linux/interrupt.h>
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#include <linux/spinlock.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sfi.h>
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#include <asm-generic/rtc.h>
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#include <asm/intel_scu_ipc.h>
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#include <asm/mrst.h>
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#include <asm/mrst-vrtc.h>
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struct mrst_rtc {
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struct rtc_device *rtc;
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struct device *dev;
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int irq;
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struct resource *iomem;
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u8 enabled_wake;
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u8 suspend_ctrl;
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};
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static const char driver_name[] = "rtc_mrst";
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#define RTC_IRQMASK (RTC_PF | RTC_AF)
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static inline int is_intr(u8 rtc_intr)
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{
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if (!(rtc_intr & RTC_IRQF))
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return 0;
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return rtc_intr & RTC_IRQMASK;
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}
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/*
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* rtc_time's year contains the increment over 1900, but vRTC's YEAR
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* register can't be programmed to value larger than 0x64, so vRTC
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* driver chose to use 1960 (1970 is UNIX time start point) as the base,
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* and does the translation at read/write time
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*/
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static int mrst_read_time(struct device *dev, struct rtc_time *time)
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{
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unsigned long flags;
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if (rtc_is_updating())
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mdelay(20);
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spin_lock_irqsave(&rtc_lock, flags);
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time->tm_sec = vrtc_cmos_read(RTC_SECONDS);
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time->tm_min = vrtc_cmos_read(RTC_MINUTES);
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time->tm_hour = vrtc_cmos_read(RTC_HOURS);
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time->tm_mday = vrtc_cmos_read(RTC_DAY_OF_MONTH);
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time->tm_mon = vrtc_cmos_read(RTC_MONTH);
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time->tm_year = vrtc_cmos_read(RTC_YEAR);
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spin_unlock_irqrestore(&rtc_lock, flags);
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/* Adjust for the 1960/1900 */
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time->tm_year += 60;
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time->tm_mon--;
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return RTC_24H;
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}
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static int mrst_set_time(struct device *dev, struct rtc_time *time)
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{
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int ret;
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unsigned long flags;
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unsigned char mon, day, hrs, min, sec;
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unsigned int yrs;
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yrs = time->tm_year;
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mon = time->tm_mon + 1; /* tm_mon starts at zero */
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day = time->tm_mday;
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hrs = time->tm_hour;
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min = time->tm_min;
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sec = time->tm_sec;
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if (yrs < 70 || yrs > 138)
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return -EINVAL;
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yrs -= 60;
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spin_lock_irqsave(&rtc_lock, flags);
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vrtc_cmos_write(yrs, RTC_YEAR);
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vrtc_cmos_write(mon, RTC_MONTH);
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vrtc_cmos_write(day, RTC_DAY_OF_MONTH);
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vrtc_cmos_write(hrs, RTC_HOURS);
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vrtc_cmos_write(min, RTC_MINUTES);
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vrtc_cmos_write(sec, RTC_SECONDS);
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spin_unlock_irqrestore(&rtc_lock, flags);
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ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETTIME);
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return ret;
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}
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static int mrst_read_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct mrst_rtc *mrst = dev_get_drvdata(dev);
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unsigned char rtc_control;
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if (mrst->irq <= 0)
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return -EIO;
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/* Basic alarms only support hour, minute, and seconds fields.
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* Some also support day and month, for alarms up to a year in
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* the future.
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*/
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t->time.tm_mday = -1;
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t->time.tm_mon = -1;
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t->time.tm_year = -1;
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/* vRTC only supports binary mode */
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spin_lock_irq(&rtc_lock);
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t->time.tm_sec = vrtc_cmos_read(RTC_SECONDS_ALARM);
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t->time.tm_min = vrtc_cmos_read(RTC_MINUTES_ALARM);
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t->time.tm_hour = vrtc_cmos_read(RTC_HOURS_ALARM);
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rtc_control = vrtc_cmos_read(RTC_CONTROL);
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spin_unlock_irq(&rtc_lock);
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t->enabled = !!(rtc_control & RTC_AIE);
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t->pending = 0;
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return 0;
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}
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static void mrst_checkintr(struct mrst_rtc *mrst, unsigned char rtc_control)
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{
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unsigned char rtc_intr;
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/*
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* NOTE after changing RTC_xIE bits we always read INTR_FLAGS;
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* allegedly some older rtcs need that to handle irqs properly
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*/
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rtc_intr = vrtc_cmos_read(RTC_INTR_FLAGS);
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rtc_intr &= (rtc_control & RTC_IRQMASK) | RTC_IRQF;
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if (is_intr(rtc_intr))
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rtc_update_irq(mrst->rtc, 1, rtc_intr);
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}
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static void mrst_irq_enable(struct mrst_rtc *mrst, unsigned char mask)
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{
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unsigned char rtc_control;
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/*
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* Flush any pending IRQ status, notably for update irqs,
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* before we enable new IRQs
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*/
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rtc_control = vrtc_cmos_read(RTC_CONTROL);
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mrst_checkintr(mrst, rtc_control);
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rtc_control |= mask;
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vrtc_cmos_write(rtc_control, RTC_CONTROL);
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mrst_checkintr(mrst, rtc_control);
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}
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static void mrst_irq_disable(struct mrst_rtc *mrst, unsigned char mask)
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{
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unsigned char rtc_control;
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rtc_control = vrtc_cmos_read(RTC_CONTROL);
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rtc_control &= ~mask;
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vrtc_cmos_write(rtc_control, RTC_CONTROL);
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mrst_checkintr(mrst, rtc_control);
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}
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static int mrst_set_alarm(struct device *dev, struct rtc_wkalrm *t)
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{
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struct mrst_rtc *mrst = dev_get_drvdata(dev);
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unsigned char hrs, min, sec;
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int ret = 0;
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if (!mrst->irq)
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return -EIO;
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hrs = t->time.tm_hour;
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min = t->time.tm_min;
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sec = t->time.tm_sec;
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spin_lock_irq(&rtc_lock);
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/* Next rtc irq must not be from previous alarm setting */
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mrst_irq_disable(mrst, RTC_AIE);
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/* Update alarm */
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vrtc_cmos_write(hrs, RTC_HOURS_ALARM);
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vrtc_cmos_write(min, RTC_MINUTES_ALARM);
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vrtc_cmos_write(sec, RTC_SECONDS_ALARM);
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spin_unlock_irq(&rtc_lock);
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ret = intel_scu_ipc_simple_command(IPCMSG_VRTC, IPC_CMD_VRTC_SETALARM);
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if (ret)
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return ret;
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spin_lock_irq(&rtc_lock);
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if (t->enabled)
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mrst_irq_enable(mrst, RTC_AIE);
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spin_unlock_irq(&rtc_lock);
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return 0;
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}
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static int mrst_irq_set_state(struct device *dev, int enabled)
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{
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struct mrst_rtc *mrst = dev_get_drvdata(dev);
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unsigned long flags;
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if (!mrst->irq)
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return -ENXIO;
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spin_lock_irqsave(&rtc_lock, flags);
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if (enabled)
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mrst_irq_enable(mrst, RTC_PIE);
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else
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mrst_irq_disable(mrst, RTC_PIE);
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spin_unlock_irqrestore(&rtc_lock, flags);
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return 0;
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}
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#if defined(CONFIG_RTC_INTF_DEV) || defined(CONFIG_RTC_INTF_DEV_MODULE)
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/* Currently, the vRTC doesn't support UIE ON/OFF */
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static int
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mrst_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
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{
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struct mrst_rtc *mrst = dev_get_drvdata(dev);
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unsigned long flags;
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switch (cmd) {
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case RTC_AIE_OFF:
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case RTC_AIE_ON:
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if (!mrst->irq)
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return -EINVAL;
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break;
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default:
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/* PIE ON/OFF is handled by mrst_irq_set_state() */
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return -ENOIOCTLCMD;
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}
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spin_lock_irqsave(&rtc_lock, flags);
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switch (cmd) {
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case RTC_AIE_OFF: /* alarm off */
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mrst_irq_disable(mrst, RTC_AIE);
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break;
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case RTC_AIE_ON: /* alarm on */
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mrst_irq_enable(mrst, RTC_AIE);
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break;
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}
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spin_unlock_irqrestore(&rtc_lock, flags);
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return 0;
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}
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#else
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#define mrst_rtc_ioctl NULL
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#endif
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#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
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static int mrst_procfs(struct device *dev, struct seq_file *seq)
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{
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unsigned char rtc_control, valid;
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spin_lock_irq(&rtc_lock);
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rtc_control = vrtc_cmos_read(RTC_CONTROL);
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valid = vrtc_cmos_read(RTC_VALID);
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spin_unlock_irq(&rtc_lock);
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return seq_printf(seq,
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"periodic_IRQ\t: %s\n"
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"alarm\t\t: %s\n"
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"BCD\t\t: no\n"
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"periodic_freq\t: daily (not adjustable)\n",
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(rtc_control & RTC_PIE) ? "on" : "off",
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(rtc_control & RTC_AIE) ? "on" : "off");
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}
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#else
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#define mrst_procfs NULL
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#endif
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static const struct rtc_class_ops mrst_rtc_ops = {
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.ioctl = mrst_rtc_ioctl,
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.read_time = mrst_read_time,
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.set_time = mrst_set_time,
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.read_alarm = mrst_read_alarm,
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.set_alarm = mrst_set_alarm,
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.proc = mrst_procfs,
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.irq_set_state = mrst_irq_set_state,
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};
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static struct mrst_rtc mrst_rtc;
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/*
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* When vRTC IRQ is captured by SCU FW, FW will clear the AIE bit in
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* Reg B, so no need for this driver to clear it
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*/
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static irqreturn_t mrst_rtc_irq(int irq, void *p)
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{
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u8 irqstat;
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spin_lock(&rtc_lock);
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/* This read will clear all IRQ flags inside Reg C */
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irqstat = vrtc_cmos_read(RTC_INTR_FLAGS);
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spin_unlock(&rtc_lock);
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irqstat &= RTC_IRQMASK | RTC_IRQF;
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if (is_intr(irqstat)) {
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rtc_update_irq(p, 1, irqstat);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static int __init
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vrtc_mrst_do_probe(struct device *dev, struct resource *iomem, int rtc_irq)
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{
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int retval = 0;
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unsigned char rtc_control;
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/* There can be only one ... */
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if (mrst_rtc.dev)
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return -EBUSY;
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if (!iomem)
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return -ENODEV;
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iomem = request_mem_region(iomem->start,
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iomem->end + 1 - iomem->start,
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driver_name);
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if (!iomem) {
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dev_dbg(dev, "i/o mem already in use.\n");
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return -EBUSY;
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}
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mrst_rtc.irq = rtc_irq;
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mrst_rtc.iomem = iomem;
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mrst_rtc.rtc = rtc_device_register(driver_name, dev,
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&mrst_rtc_ops, THIS_MODULE);
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if (IS_ERR(mrst_rtc.rtc)) {
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retval = PTR_ERR(mrst_rtc.rtc);
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||||
goto cleanup0;
|
||||
}
|
||||
|
||||
mrst_rtc.dev = dev;
|
||||
dev_set_drvdata(dev, &mrst_rtc);
|
||||
rename_region(iomem, dev_name(&mrst_rtc.rtc->dev));
|
||||
|
||||
spin_lock_irq(&rtc_lock);
|
||||
mrst_irq_disable(&mrst_rtc, RTC_PIE | RTC_AIE);
|
||||
rtc_control = vrtc_cmos_read(RTC_CONTROL);
|
||||
spin_unlock_irq(&rtc_lock);
|
||||
|
||||
if (!(rtc_control & RTC_24H) || (rtc_control & (RTC_DM_BINARY)))
|
||||
dev_dbg(dev, "TODO: support more than 24-hr BCD mode\n");
|
||||
|
||||
if (rtc_irq) {
|
||||
retval = request_irq(rtc_irq, mrst_rtc_irq,
|
||||
IRQF_DISABLED, dev_name(&mrst_rtc.rtc->dev),
|
||||
mrst_rtc.rtc);
|
||||
if (retval < 0) {
|
||||
dev_dbg(dev, "IRQ %d is already in use, err %d\n",
|
||||
rtc_irq, retval);
|
||||
goto cleanup1;
|
||||
}
|
||||
}
|
||||
dev_dbg(dev, "initialised\n");
|
||||
return 0;
|
||||
|
||||
cleanup1:
|
||||
mrst_rtc.dev = NULL;
|
||||
rtc_device_unregister(mrst_rtc.rtc);
|
||||
cleanup0:
|
||||
release_region(iomem->start, iomem->end + 1 - iomem->start);
|
||||
dev_err(dev, "rtc-mrst: unable to initialise\n");
|
||||
return retval;
|
||||
}
|
||||
|
||||
static void rtc_mrst_do_shutdown(void)
|
||||
{
|
||||
spin_lock_irq(&rtc_lock);
|
||||
mrst_irq_disable(&mrst_rtc, RTC_IRQMASK);
|
||||
spin_unlock_irq(&rtc_lock);
|
||||
}
|
||||
|
||||
static void __exit rtc_mrst_do_remove(struct device *dev)
|
||||
{
|
||||
struct mrst_rtc *mrst = dev_get_drvdata(dev);
|
||||
struct resource *iomem;
|
||||
|
||||
rtc_mrst_do_shutdown();
|
||||
|
||||
if (mrst->irq)
|
||||
free_irq(mrst->irq, mrst->rtc);
|
||||
|
||||
rtc_device_unregister(mrst->rtc);
|
||||
mrst->rtc = NULL;
|
||||
|
||||
iomem = mrst->iomem;
|
||||
release_region(iomem->start, iomem->end + 1 - iomem->start);
|
||||
mrst->iomem = NULL;
|
||||
|
||||
mrst->dev = NULL;
|
||||
dev_set_drvdata(dev, NULL);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_PM
|
||||
static int mrst_suspend(struct device *dev, pm_message_t mesg)
|
||||
{
|
||||
struct mrst_rtc *mrst = dev_get_drvdata(dev);
|
||||
unsigned char tmp;
|
||||
|
||||
/* Only the alarm might be a wakeup event source */
|
||||
spin_lock_irq(&rtc_lock);
|
||||
mrst->suspend_ctrl = tmp = vrtc_cmos_read(RTC_CONTROL);
|
||||
if (tmp & (RTC_PIE | RTC_AIE)) {
|
||||
unsigned char mask;
|
||||
|
||||
if (device_may_wakeup(dev))
|
||||
mask = RTC_IRQMASK & ~RTC_AIE;
|
||||
else
|
||||
mask = RTC_IRQMASK;
|
||||
tmp &= ~mask;
|
||||
vrtc_cmos_write(tmp, RTC_CONTROL);
|
||||
|
||||
mrst_checkintr(mrst, tmp);
|
||||
}
|
||||
spin_unlock_irq(&rtc_lock);
|
||||
|
||||
if (tmp & RTC_AIE) {
|
||||
mrst->enabled_wake = 1;
|
||||
enable_irq_wake(mrst->irq);
|
||||
}
|
||||
|
||||
dev_dbg(&mrst_rtc.rtc->dev, "suspend%s, ctrl %02x\n",
|
||||
(tmp & RTC_AIE) ? ", alarm may wake" : "",
|
||||
tmp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* We want RTC alarms to wake us from the deep power saving state
|
||||
*/
|
||||
static inline int mrst_poweroff(struct device *dev)
|
||||
{
|
||||
return mrst_suspend(dev, PMSG_HIBERNATE);
|
||||
}
|
||||
|
||||
static int mrst_resume(struct device *dev)
|
||||
{
|
||||
struct mrst_rtc *mrst = dev_get_drvdata(dev);
|
||||
unsigned char tmp = mrst->suspend_ctrl;
|
||||
|
||||
/* Re-enable any irqs previously active */
|
||||
if (tmp & RTC_IRQMASK) {
|
||||
unsigned char mask;
|
||||
|
||||
if (mrst->enabled_wake) {
|
||||
disable_irq_wake(mrst->irq);
|
||||
mrst->enabled_wake = 0;
|
||||
}
|
||||
|
||||
spin_lock_irq(&rtc_lock);
|
||||
do {
|
||||
vrtc_cmos_write(tmp, RTC_CONTROL);
|
||||
|
||||
mask = vrtc_cmos_read(RTC_INTR_FLAGS);
|
||||
mask &= (tmp & RTC_IRQMASK) | RTC_IRQF;
|
||||
if (!is_intr(mask))
|
||||
break;
|
||||
|
||||
rtc_update_irq(mrst->rtc, 1, mask);
|
||||
tmp &= ~RTC_AIE;
|
||||
} while (mask & RTC_AIE);
|
||||
spin_unlock_irq(&rtc_lock);
|
||||
}
|
||||
|
||||
dev_dbg(&mrst_rtc.rtc->dev, "resume, ctrl %02x\n", tmp);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
#else
|
||||
#define mrst_suspend NULL
|
||||
#define mrst_resume NULL
|
||||
|
||||
static inline int mrst_poweroff(struct device *dev)
|
||||
{
|
||||
return -ENOSYS;
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
static int __init vrtc_mrst_platform_probe(struct platform_device *pdev)
|
||||
{
|
||||
return vrtc_mrst_do_probe(&pdev->dev,
|
||||
platform_get_resource(pdev, IORESOURCE_MEM, 0),
|
||||
platform_get_irq(pdev, 0));
|
||||
}
|
||||
|
||||
static int __exit vrtc_mrst_platform_remove(struct platform_device *pdev)
|
||||
{
|
||||
rtc_mrst_do_remove(&pdev->dev);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void vrtc_mrst_platform_shutdown(struct platform_device *pdev)
|
||||
{
|
||||
if (system_state == SYSTEM_POWER_OFF && !mrst_poweroff(&pdev->dev))
|
||||
return;
|
||||
|
||||
rtc_mrst_do_shutdown();
|
||||
}
|
||||
|
||||
MODULE_ALIAS("platform:vrtc_mrst");
|
||||
|
||||
static struct platform_driver vrtc_mrst_platform_driver = {
|
||||
.probe = vrtc_mrst_platform_probe,
|
||||
.remove = __exit_p(vrtc_mrst_platform_remove),
|
||||
.shutdown = vrtc_mrst_platform_shutdown,
|
||||
.driver = {
|
||||
.name = (char *) driver_name,
|
||||
.suspend = mrst_suspend,
|
||||
.resume = mrst_resume,
|
||||
}
|
||||
};
|
||||
|
||||
static int __init vrtc_mrst_init(void)
|
||||
{
|
||||
return platform_driver_register(&vrtc_mrst_platform_driver);
|
||||
}
|
||||
|
||||
static void __exit vrtc_mrst_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&vrtc_mrst_platform_driver);
|
||||
}
|
||||
|
||||
module_init(vrtc_mrst_init);
|
||||
module_exit(vrtc_mrst_exit);
|
||||
|
||||
MODULE_AUTHOR("Jacob Pan; Feng Tang");
|
||||
MODULE_DESCRIPTION("Driver for Moorestown virtual RTC");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in a new issue