From: Yoichi Yuasa Date: Tue, 11 Apr 2006 05:54:47 +0000 (-0700) Subject: [PATCH] RTC subsystem: VR41XX driver X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8417eb7a168eee8b9baa744ee5c591868e85529a;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git [PATCH] RTC subsystem: VR41XX driver This patch updates VR4100 series RTC driver. * This driver supports new RTC subsystem. * Simple set time/read time test worked fine. Signed-off-by: Yoichi Yuasa Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig index 889cad07774..402296670d3 100644 --- a/drivers/char/Kconfig +++ b/drivers/char/Kconfig @@ -805,10 +805,6 @@ config S3C2410_RTC Samsung S3C2410. This can provide periodic interrupt rates from 1Hz to 64Hz for user programs, and wakeup from Alarm. -config RTC_VR41XX - tristate "NEC VR4100 series Real Time Clock Support" - depends on CPU_VR41XX - config COBALT_LCD bool "Support for Cobalt LCD" depends on MIPS_COBALT diff --git a/drivers/char/Makefile b/drivers/char/Makefile index a73cb495692..f5b01c6d498 100644 --- a/drivers/char/Makefile +++ b/drivers/char/Makefile @@ -67,7 +67,6 @@ obj-$(CONFIG_SGI_DS1286) += ds1286.o obj-$(CONFIG_SGI_IP27_RTC) += ip27-rtc.o obj-$(CONFIG_DS1302) += ds1302.o obj-$(CONFIG_S3C2410_RTC) += s3c2410-rtc.o -obj-$(CONFIG_RTC_VR41XX) += vr41xx_rtc.o ifeq ($(CONFIG_GENERIC_NVRAM),y) obj-$(CONFIG_NVRAM) += generic_nvram.o else diff --git a/drivers/char/vr41xx_rtc.c b/drivers/char/vr41xx_rtc.c deleted file mode 100644 index b109d9a502d..00000000000 --- a/drivers/char/vr41xx_rtc.c +++ /dev/null @@ -1,717 +0,0 @@ -/* - * Driver for NEC VR4100 series Real Time Clock unit. - * - * Copyright (C) 2003-2005 Yoichi Yuasa - * - * 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; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - */ -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include -#include - -#include -#include -#include -#include -#include - -MODULE_AUTHOR("Yoichi Yuasa "); -MODULE_DESCRIPTION("NEC VR4100 series RTC driver"); -MODULE_LICENSE("GPL"); - -#define RTC1_TYPE1_START 0x0b0000c0UL -#define RTC1_TYPE1_END 0x0b0000dfUL -#define RTC2_TYPE1_START 0x0b0001c0UL -#define RTC2_TYPE1_END 0x0b0001dfUL - -#define RTC1_TYPE2_START 0x0f000100UL -#define RTC1_TYPE2_END 0x0f00011fUL -#define RTC2_TYPE2_START 0x0f000120UL -#define RTC2_TYPE2_END 0x0f00013fUL - -#define RTC1_SIZE 0x20 -#define RTC2_SIZE 0x20 - -/* RTC 1 registers */ -#define ETIMELREG 0x00 -#define ETIMEMREG 0x02 -#define ETIMEHREG 0x04 -/* RFU */ -#define ECMPLREG 0x08 -#define ECMPMREG 0x0a -#define ECMPHREG 0x0c -/* RFU */ -#define RTCL1LREG 0x10 -#define RTCL1HREG 0x12 -#define RTCL1CNTLREG 0x14 -#define RTCL1CNTHREG 0x16 -#define RTCL2LREG 0x18 -#define RTCL2HREG 0x1a -#define RTCL2CNTLREG 0x1c -#define RTCL2CNTHREG 0x1e - -/* RTC 2 registers */ -#define TCLKLREG 0x00 -#define TCLKHREG 0x02 -#define TCLKCNTLREG 0x04 -#define TCLKCNTHREG 0x06 -/* RFU */ -#define RTCINTREG 0x1e - #define TCLOCK_INT 0x08 - #define RTCLONG2_INT 0x04 - #define RTCLONG1_INT 0x02 - #define ELAPSEDTIME_INT 0x01 - -#define RTC_FREQUENCY 32768 -#define MAX_PERIODIC_RATE 6553 -#define MAX_USER_PERIODIC_RATE 64 - -static void __iomem *rtc1_base; -static void __iomem *rtc2_base; - -#define rtc1_read(offset) readw(rtc1_base + (offset)) -#define rtc1_write(offset, value) writew((value), rtc1_base + (offset)) - -#define rtc2_read(offset) readw(rtc2_base + (offset)) -#define rtc2_write(offset, value) writew((value), rtc2_base + (offset)) - -static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */ - -static spinlock_t rtc_task_lock; -static wait_queue_head_t rtc_wait; -static unsigned long rtc_irq_data; -static struct fasync_struct *rtc_async_queue; -static rtc_task_t *rtc_callback; -static char rtc_name[] = "RTC"; -static unsigned long periodic_frequency; -static unsigned long periodic_count; - -typedef enum { - RTC_RELEASE, - RTC_OPEN, -} rtc_status_t; - -static rtc_status_t rtc_status; - -typedef enum { - FUNCTION_RTC_IOCTL, - FUNCTION_RTC_CONTROL, -} rtc_callfrom_t; - -struct resource rtc_resource[2] = { - { .name = rtc_name, - .flags = IORESOURCE_MEM, }, - { .name = rtc_name, - .flags = IORESOURCE_MEM, }, -}; - -static inline unsigned long read_elapsed_second(void) -{ - unsigned long first_low, first_mid, first_high; - unsigned long second_low, second_mid, second_high; - - do { - first_low = rtc1_read(ETIMELREG); - first_mid = rtc1_read(ETIMEMREG); - first_high = rtc1_read(ETIMEHREG); - second_low = rtc1_read(ETIMELREG); - second_mid = rtc1_read(ETIMEMREG); - second_high = rtc1_read(ETIMEHREG); - } while (first_low != second_low || first_mid != second_mid || - first_high != second_high); - - return (first_high << 17) | (first_mid << 1) | (first_low >> 15); -} - -static inline void write_elapsed_second(unsigned long sec) -{ - spin_lock_irq(&rtc_lock); - - rtc1_write(ETIMELREG, (uint16_t)(sec << 15)); - rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1)); - rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17)); - - spin_unlock_irq(&rtc_lock); -} - -static void set_alarm(struct rtc_time *time) -{ - unsigned long alarm_sec; - - alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday, - time->tm_hour, time->tm_min, time->tm_sec); - - spin_lock_irq(&rtc_lock); - - rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15)); - rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1)); - rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17)); - - spin_unlock_irq(&rtc_lock); -} - -static void read_alarm(struct rtc_time *time) -{ - unsigned long low, mid, high; - - spin_lock_irq(&rtc_lock); - - low = rtc1_read(ECMPLREG); - mid = rtc1_read(ECMPMREG); - high = rtc1_read(ECMPHREG); - - spin_unlock_irq(&rtc_lock); - - to_tm((high << 17) | (mid << 1) | (low >> 15), time); - time->tm_year -= 1900; -} - -static void read_time(struct rtc_time *time) -{ - unsigned long epoch_sec, elapsed_sec; - - epoch_sec = mktime(epoch, 1, 1, 0, 0, 0); - elapsed_sec = read_elapsed_second(); - - to_tm(epoch_sec + elapsed_sec, time); - time->tm_year -= 1900; -} - -static void set_time(struct rtc_time *time) -{ - unsigned long epoch_sec, current_sec; - - epoch_sec = mktime(epoch, 1, 1, 0, 0, 0); - current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday, - time->tm_hour, time->tm_min, time->tm_sec); - - write_elapsed_second(current_sec - epoch_sec); -} - -static ssize_t rtc_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) -{ - DECLARE_WAITQUEUE(wait, current); - unsigned long irq_data; - int retval = 0; - - if (count != sizeof(unsigned int) && count != sizeof(unsigned long)) - return -EINVAL; - - add_wait_queue(&rtc_wait, &wait); - - do { - __set_current_state(TASK_INTERRUPTIBLE); - - spin_lock_irq(&rtc_lock); - irq_data = rtc_irq_data; - rtc_irq_data = 0; - spin_unlock_irq(&rtc_lock); - - if (irq_data != 0) - break; - - if (file->f_flags & O_NONBLOCK) { - retval = -EAGAIN; - break; - } - - if (signal_pending(current)) { - retval = -ERESTARTSYS; - break; - } - } while (1); - - if (retval == 0) { - if (count == sizeof(unsigned int)) { - retval = put_user(irq_data, (unsigned int __user *)buf); - if (retval == 0) - retval = sizeof(unsigned int); - } else { - retval = put_user(irq_data, (unsigned long __user *)buf); - if (retval == 0) - retval = sizeof(unsigned long); - } - - } - - __set_current_state(TASK_RUNNING); - remove_wait_queue(&rtc_wait, &wait); - - return retval; -} - -static unsigned int rtc_poll(struct file *file, struct poll_table_struct *table) -{ - poll_wait(file, &rtc_wait, table); - - if (rtc_irq_data != 0) - return POLLIN | POLLRDNORM; - - return 0; -} - -static int rtc_do_ioctl(unsigned int cmd, unsigned long arg, rtc_callfrom_t from) -{ - struct rtc_time time; - unsigned long count; - - switch (cmd) { - case RTC_AIE_ON: - enable_irq(ELAPSEDTIME_IRQ); - break; - case RTC_AIE_OFF: - disable_irq(ELAPSEDTIME_IRQ); - break; - case RTC_PIE_ON: - enable_irq(RTCLONG1_IRQ); - break; - case RTC_PIE_OFF: - disable_irq(RTCLONG1_IRQ); - break; - case RTC_ALM_SET: - if (copy_from_user(&time, (struct rtc_time __user *)arg, - sizeof(struct rtc_time))) - return -EFAULT; - - set_alarm(&time); - break; - case RTC_ALM_READ: - memset(&time, 0, sizeof(struct rtc_time)); - read_alarm(&time); - break; - case RTC_RD_TIME: - memset(&time, 0, sizeof(struct rtc_time)); - read_time(&time); - if (copy_to_user((void __user *)arg, &time, sizeof(struct rtc_time))) - return -EFAULT; - break; - case RTC_SET_TIME: - if (capable(CAP_SYS_TIME) == 0) - return -EACCES; - - if (copy_from_user(&time, (struct rtc_time __user *)arg, - sizeof(struct rtc_time))) - return -EFAULT; - - set_time(&time); - break; - case RTC_IRQP_READ: - return put_user(periodic_frequency, (unsigned long __user *)arg); - break; - case RTC_IRQP_SET: - if (arg > MAX_PERIODIC_RATE) - return -EINVAL; - - if (from == FUNCTION_RTC_IOCTL && arg > MAX_USER_PERIODIC_RATE && - capable(CAP_SYS_RESOURCE) == 0) - return -EACCES; - - periodic_frequency = arg; - - count = RTC_FREQUENCY; - do_div(count, arg); - - periodic_count = count; - - spin_lock_irq(&rtc_lock); - - rtc1_write(RTCL1LREG, count); - rtc1_write(RTCL1HREG, count >> 16); - - spin_unlock_irq(&rtc_lock); - break; - case RTC_EPOCH_READ: - return put_user(epoch, (unsigned long __user *)arg); - case RTC_EPOCH_SET: - /* Doesn't support before 1900 */ - if (arg < 1900) - return -EINVAL; - - if (capable(CAP_SYS_TIME) == 0) - return -EACCES; - - epoch = arg; - break; - default: - return -EINVAL; - } - - return 0; -} - -static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd, - unsigned long arg) -{ - return rtc_do_ioctl(cmd, arg, FUNCTION_RTC_IOCTL); -} - -static int rtc_open(struct inode *inode, struct file *file) -{ - spin_lock_irq(&rtc_lock); - - if (rtc_status == RTC_OPEN) { - spin_unlock_irq(&rtc_lock); - return -EBUSY; - } - - rtc_status = RTC_OPEN; - rtc_irq_data = 0; - - spin_unlock_irq(&rtc_lock); - - return 0; -} - -static int rtc_release(struct inode *inode, struct file *file) -{ - if (file->f_flags & FASYNC) - (void)fasync_helper(-1, file, 0, &rtc_async_queue); - - spin_lock_irq(&rtc_lock); - - rtc1_write(ECMPLREG, 0); - rtc1_write(ECMPMREG, 0); - rtc1_write(ECMPHREG, 0); - rtc1_write(RTCL1LREG, 0); - rtc1_write(RTCL1HREG, 0); - - rtc_status = RTC_RELEASE; - - spin_unlock_irq(&rtc_lock); - - disable_irq(ELAPSEDTIME_IRQ); - disable_irq(RTCLONG1_IRQ); - - return 0; -} - -static int rtc_fasync(int fd, struct file *file, int on) -{ - return fasync_helper(fd, file, on, &rtc_async_queue); -} - -static struct file_operations rtc_fops = { - .owner = THIS_MODULE, - .llseek = no_llseek, - .read = rtc_read, - .poll = rtc_poll, - .ioctl = rtc_ioctl, - .open = rtc_open, - .release = rtc_release, - .fasync = rtc_fasync, -}; - -static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - spin_lock(&rtc_lock); - rtc2_write(RTCINTREG, ELAPSEDTIME_INT); - - rtc_irq_data += 0x100; - rtc_irq_data &= ~0xff; - rtc_irq_data |= RTC_AF; - spin_unlock(&rtc_lock); - - spin_lock(&rtc_lock); - if (rtc_callback) - rtc_callback->func(rtc_callback->private_data); - spin_unlock(&rtc_lock); - - wake_up_interruptible(&rtc_wait); - - kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); - - return IRQ_HANDLED; -} - -static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs) -{ - unsigned long count = periodic_count; - - spin_lock(&rtc_lock); - rtc2_write(RTCINTREG, RTCLONG1_INT); - - rtc1_write(RTCL1LREG, count); - rtc1_write(RTCL1HREG, count >> 16); - - rtc_irq_data += 0x100; - rtc_irq_data &= ~0xff; - rtc_irq_data |= RTC_PF; - spin_unlock(&rtc_lock); - - spin_lock(&rtc_task_lock); - if (rtc_callback) - rtc_callback->func(rtc_callback->private_data); - spin_unlock(&rtc_task_lock); - - wake_up_interruptible(&rtc_wait); - - kill_fasync(&rtc_async_queue, SIGIO, POLL_IN); - - return IRQ_HANDLED; -} - -int rtc_register(rtc_task_t *task) -{ - if (task == NULL || task->func == NULL) - return -EINVAL; - - spin_lock_irq(&rtc_lock); - if (rtc_status == RTC_OPEN) { - spin_unlock_irq(&rtc_lock); - return -EBUSY; - } - - spin_lock(&rtc_task_lock); - if (rtc_callback != NULL) { - spin_unlock(&rtc_task_lock); - spin_unlock_irq(&rtc_task_lock); - return -EBUSY; - } - - rtc_callback = task; - spin_unlock(&rtc_task_lock); - - rtc_status = RTC_OPEN; - - spin_unlock_irq(&rtc_lock); - - return 0; -} - -EXPORT_SYMBOL_GPL(rtc_register); - -int rtc_unregister(rtc_task_t *task) -{ - spin_lock_irq(&rtc_task_lock); - if (task == NULL || rtc_callback != task) { - spin_unlock_irq(&rtc_task_lock); - return -ENXIO; - } - - spin_lock(&rtc_lock); - - rtc1_write(ECMPLREG, 0); - rtc1_write(ECMPMREG, 0); - rtc1_write(ECMPHREG, 0); - rtc1_write(RTCL1LREG, 0); - rtc1_write(RTCL1HREG, 0); - - rtc_status = RTC_RELEASE; - - spin_unlock(&rtc_lock); - - rtc_callback = NULL; - - spin_unlock_irq(&rtc_task_lock); - - disable_irq(ELAPSEDTIME_IRQ); - disable_irq(RTCLONG1_IRQ); - - return 0; -} - -EXPORT_SYMBOL_GPL(rtc_unregister); - -int rtc_control(rtc_task_t *task, unsigned int cmd, unsigned long arg) -{ - int retval = 0; - - spin_lock_irq(&rtc_task_lock); - - if (rtc_callback != task) - retval = -ENXIO; - else - rtc_do_ioctl(cmd, arg, FUNCTION_RTC_CONTROL); - - spin_unlock_irq(&rtc_task_lock); - - return retval; -} - -EXPORT_SYMBOL_GPL(rtc_control); - -static struct miscdevice rtc_miscdevice = { - .minor = RTC_MINOR, - .name = rtc_name, - .fops = &rtc_fops, -}; - -static int __devinit rtc_probe(struct platform_device *pdev) -{ - unsigned int irq; - int retval; - - if (pdev->num_resources != 2) - return -EBUSY; - - rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE); - if (rtc1_base == NULL) - return -EBUSY; - - rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE); - if (rtc2_base == NULL) { - iounmap(rtc1_base); - rtc1_base = NULL; - return -EBUSY; - } - - retval = misc_register(&rtc_miscdevice); - if (retval < 0) { - iounmap(rtc1_base); - iounmap(rtc2_base); - rtc1_base = NULL; - rtc2_base = NULL; - return retval; - } - - spin_lock_irq(&rtc_lock); - - rtc1_write(ECMPLREG, 0); - rtc1_write(ECMPMREG, 0); - rtc1_write(ECMPHREG, 0); - rtc1_write(RTCL1LREG, 0); - rtc1_write(RTCL1HREG, 0); - - rtc_status = RTC_RELEASE; - rtc_irq_data = 0; - - spin_unlock_irq(&rtc_lock); - - init_waitqueue_head(&rtc_wait); - - irq = ELAPSEDTIME_IRQ; - retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT, - "elapsed_time", NULL); - if (retval == 0) { - irq = RTCLONG1_IRQ; - retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT, - "rtclong1", NULL); - } - - if (retval < 0) { - printk(KERN_ERR "rtc: IRQ%d is busy\n", irq); - if (irq == RTCLONG1_IRQ) - free_irq(ELAPSEDTIME_IRQ, NULL); - iounmap(rtc1_base); - iounmap(rtc2_base); - rtc1_base = NULL; - rtc2_base = NULL; - return retval; - } - - disable_irq(ELAPSEDTIME_IRQ); - disable_irq(RTCLONG1_IRQ); - - spin_lock_init(&rtc_task_lock); - - printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n"); - - return 0; -} - -static int __devexit rtc_remove(struct platform_device *dev) -{ - int retval; - - retval = misc_deregister(&rtc_miscdevice); - if (retval < 0) - return retval; - - free_irq(ELAPSEDTIME_IRQ, NULL); - free_irq(RTCLONG1_IRQ, NULL); - if (rtc1_base != NULL) - iounmap(rtc1_base); - if (rtc2_base != NULL) - iounmap(rtc2_base); - - return 0; -} - -static struct platform_device *rtc_platform_device; - -static struct platform_driver rtc_device_driver = { - .probe = rtc_probe, - .remove = __devexit_p(rtc_remove), - .driver = { - .name = rtc_name, - .owner = THIS_MODULE, - }, -}; - -static int __init vr41xx_rtc_init(void) -{ - int retval; - - switch (current_cpu_data.cputype) { - case CPU_VR4111: - case CPU_VR4121: - rtc_resource[0].start = RTC1_TYPE1_START; - rtc_resource[0].end = RTC1_TYPE1_END; - rtc_resource[1].start = RTC2_TYPE1_START; - rtc_resource[1].end = RTC2_TYPE1_END; - break; - case CPU_VR4122: - case CPU_VR4131: - case CPU_VR4133: - rtc_resource[0].start = RTC1_TYPE2_START; - rtc_resource[0].end = RTC1_TYPE2_END; - rtc_resource[1].start = RTC2_TYPE2_START; - rtc_resource[1].end = RTC2_TYPE2_END; - break; - default: - return -ENODEV; - break; - } - - rtc_platform_device = platform_device_alloc("RTC", -1); - if (!rtc_platform_device) - return -ENOMEM; - - retval = platform_device_add_resources(rtc_platform_device, - rtc_resource, ARRAY_SIZE(rtc_resource)); - - if (retval == 0) - retval = platform_device_add(rtc_platform_device); - - if (retval < 0) { - platform_device_put(rtc_platform_device); - return retval; - } - - retval = platform_driver_register(&rtc_device_driver); - if (retval < 0) - platform_device_unregister(rtc_platform_device); - - return retval; -} - -static void __exit vr41xx_rtc_exit(void) -{ - platform_driver_unregister(&rtc_device_driver); - platform_device_unregister(rtc_platform_device); -} - -module_init(vr41xx_rtc_init); -module_exit(vr41xx_rtc_exit); diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig index 929dd809057..b4a252b6cdc 100644 --- a/drivers/rtc/Kconfig +++ b/drivers/rtc/Kconfig @@ -147,6 +147,10 @@ config RTC_DRV_SA1100 To compile this driver as a module, choose M here: the module will be called rtc-sa1100. +config RTC_DRV_VR41XX + tristate "NEC VR4100 series RTC" + depends on RTC_CLASS && CPU_VR41XX + config RTC_DRV_TEST tristate "Test driver/device" depends on RTC_CLASS diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile index 8d4c7fe88d5..a9ca0f17168 100644 --- a/drivers/rtc/Makefile +++ b/drivers/rtc/Makefile @@ -19,3 +19,4 @@ obj-$(CONFIG_RTC_DRV_RS5C372) += rtc-rs5c372.o obj-$(CONFIG_RTC_DRV_M48T86) += rtc-m48t86.o obj-$(CONFIG_RTC_DRV_EP93XX) += rtc-ep93xx.o obj-$(CONFIG_RTC_DRV_SA1100) += rtc-sa1100.o +obj-$(CONFIG_RTC_DRV_VR41XX) += rtc-vr41xx.o diff --git a/drivers/rtc/rtc-vr41xx.c b/drivers/rtc/rtc-vr41xx.c new file mode 100644 index 00000000000..4d49fd50119 --- /dev/null +++ b/drivers/rtc/rtc-vr41xx.c @@ -0,0 +1,471 @@ +/* + * Driver for NEC VR4100 series Real Time Clock unit. + * + * Copyright (C) 2003-2006 Yoichi Yuasa + * + * 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; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include + +MODULE_AUTHOR("Yoichi Yuasa "); +MODULE_DESCRIPTION("NEC VR4100 series RTC driver"); +MODULE_LICENSE("GPL"); + +#define RTC1_TYPE1_START 0x0b0000c0UL +#define RTC1_TYPE1_END 0x0b0000dfUL +#define RTC2_TYPE1_START 0x0b0001c0UL +#define RTC2_TYPE1_END 0x0b0001dfUL + +#define RTC1_TYPE2_START 0x0f000100UL +#define RTC1_TYPE2_END 0x0f00011fUL +#define RTC2_TYPE2_START 0x0f000120UL +#define RTC2_TYPE2_END 0x0f00013fUL + +#define RTC1_SIZE 0x20 +#define RTC2_SIZE 0x20 + +/* RTC 1 registers */ +#define ETIMELREG 0x00 +#define ETIMEMREG 0x02 +#define ETIMEHREG 0x04 +/* RFU */ +#define ECMPLREG 0x08 +#define ECMPMREG 0x0a +#define ECMPHREG 0x0c +/* RFU */ +#define RTCL1LREG 0x10 +#define RTCL1HREG 0x12 +#define RTCL1CNTLREG 0x14 +#define RTCL1CNTHREG 0x16 +#define RTCL2LREG 0x18 +#define RTCL2HREG 0x1a +#define RTCL2CNTLREG 0x1c +#define RTCL2CNTHREG 0x1e + +/* RTC 2 registers */ +#define TCLKLREG 0x00 +#define TCLKHREG 0x02 +#define TCLKCNTLREG 0x04 +#define TCLKCNTHREG 0x06 +/* RFU */ +#define RTCINTREG 0x1e + #define TCLOCK_INT 0x08 + #define RTCLONG2_INT 0x04 + #define RTCLONG1_INT 0x02 + #define ELAPSEDTIME_INT 0x01 + +#define RTC_FREQUENCY 32768 +#define MAX_PERIODIC_RATE 6553 +#define MAX_USER_PERIODIC_RATE 64 + +static void __iomem *rtc1_base; +static void __iomem *rtc2_base; + +#define rtc1_read(offset) readw(rtc1_base + (offset)) +#define rtc1_write(offset, value) writew((value), rtc1_base + (offset)) + +#define rtc2_read(offset) readw(rtc2_base + (offset)) +#define rtc2_write(offset, value) writew((value), rtc2_base + (offset)) + +static unsigned long epoch = 1970; /* Jan 1 1970 00:00:00 */ + +static spinlock_t rtc_lock = SPIN_LOCK_UNLOCKED; +static char rtc_name[] = "RTC"; +static unsigned long periodic_frequency; +static unsigned long periodic_count; + +struct resource rtc_resource[2] = { + { .name = rtc_name, + .flags = IORESOURCE_MEM, }, + { .name = rtc_name, + .flags = IORESOURCE_MEM, }, +}; + +static inline unsigned long read_elapsed_second(void) +{ + + unsigned long first_low, first_mid, first_high; + + unsigned long second_low, second_mid, second_high; + + do { + first_low = rtc1_read(ETIMELREG); + first_mid = rtc1_read(ETIMEMREG); + first_high = rtc1_read(ETIMEHREG); + second_low = rtc1_read(ETIMELREG); + second_mid = rtc1_read(ETIMEMREG); + second_high = rtc1_read(ETIMEHREG); + } while (first_low != second_low || first_mid != second_mid || + first_high != second_high); + + return (first_high << 17) | (first_mid << 1) | (first_low >> 15); +} + +static inline void write_elapsed_second(unsigned long sec) +{ + spin_lock_irq(&rtc_lock); + + rtc1_write(ETIMELREG, (uint16_t)(sec << 15)); + rtc1_write(ETIMEMREG, (uint16_t)(sec >> 1)); + rtc1_write(ETIMEHREG, (uint16_t)(sec >> 17)); + + spin_unlock_irq(&rtc_lock); +} + +static void vr41xx_rtc_release(struct device *dev) +{ + + spin_lock_irq(&rtc_lock); + + rtc1_write(ECMPLREG, 0); + rtc1_write(ECMPMREG, 0); + rtc1_write(ECMPHREG, 0); + rtc1_write(RTCL1LREG, 0); + rtc1_write(RTCL1HREG, 0); + + spin_unlock_irq(&rtc_lock); + + disable_irq(ELAPSEDTIME_IRQ); + disable_irq(RTCLONG1_IRQ); +} + +static int vr41xx_rtc_read_time(struct device *dev, struct rtc_time *time) +{ + unsigned long epoch_sec, elapsed_sec; + + epoch_sec = mktime(epoch, 1, 1, 0, 0, 0); + elapsed_sec = read_elapsed_second(); + + rtc_time_to_tm(epoch_sec + elapsed_sec, time); + + return 0; +} + +static int vr41xx_rtc_set_time(struct device *dev, struct rtc_time *time) +{ + unsigned long epoch_sec, current_sec; + + epoch_sec = mktime(epoch, 1, 1, 0, 0, 0); + current_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday, + time->tm_hour, time->tm_min, time->tm_sec); + + write_elapsed_second(current_sec - epoch_sec); + + return 0; +} + +static int vr41xx_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + unsigned long low, mid, high; + struct rtc_time *time = &wkalrm->time; + + spin_lock_irq(&rtc_lock); + + low = rtc1_read(ECMPLREG); + mid = rtc1_read(ECMPMREG); + high = rtc1_read(ECMPHREG); + + spin_unlock_irq(&rtc_lock); + + rtc_time_to_tm((high << 17) | (mid << 1) | (low >> 15), time); + + return 0; +} + +static int vr41xx_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) +{ + unsigned long alarm_sec; + struct rtc_time *time = &wkalrm->time; + + alarm_sec = mktime(time->tm_year + 1900, time->tm_mon + 1, time->tm_mday, + time->tm_hour, time->tm_min, time->tm_sec); + + spin_lock_irq(&rtc_lock); + + rtc1_write(ECMPLREG, (uint16_t)(alarm_sec << 15)); + rtc1_write(ECMPMREG, (uint16_t)(alarm_sec >> 1)); + rtc1_write(ECMPHREG, (uint16_t)(alarm_sec >> 17)); + + spin_unlock_irq(&rtc_lock); + + return 0; +} + +static int vr41xx_rtc_ioctl(struct device *dev, unsigned int cmd, unsigned long arg) +{ + unsigned long count; + + switch (cmd) { + case RTC_AIE_ON: + enable_irq(ELAPSEDTIME_IRQ); + break; + case RTC_AIE_OFF: + disable_irq(ELAPSEDTIME_IRQ); + break; + case RTC_PIE_ON: + enable_irq(RTCLONG1_IRQ); + break; + case RTC_PIE_OFF: + disable_irq(RTCLONG1_IRQ); + break; + case RTC_IRQP_READ: + return put_user(periodic_frequency, (unsigned long __user *)arg); + break; + case RTC_IRQP_SET: + if (arg > MAX_PERIODIC_RATE) + return -EINVAL; + + if (arg > MAX_USER_PERIODIC_RATE && capable(CAP_SYS_RESOURCE) == 0) + return -EACCES; + + periodic_frequency = arg; + + count = RTC_FREQUENCY; + do_div(count, arg); + + periodic_count = count; + + spin_lock_irq(&rtc_lock); + + rtc1_write(RTCL1LREG, count); + rtc1_write(RTCL1HREG, count >> 16); + + spin_unlock_irq(&rtc_lock); + break; + case RTC_EPOCH_READ: + return put_user(epoch, (unsigned long __user *)arg); + case RTC_EPOCH_SET: + /* Doesn't support before 1900 */ + if (arg < 1900) + return -EINVAL; + + if (capable(CAP_SYS_TIME) == 0) + return -EACCES; + + epoch = arg; + break; + default: + return -EINVAL; + } + + return 0; +} + +static irqreturn_t elapsedtime_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct platform_device *pdev = (struct platform_device *)dev_id; + struct rtc_device *rtc = platform_get_drvdata(pdev); + + rtc2_write(RTCINTREG, ELAPSEDTIME_INT); + + rtc_update_irq(&rtc->class_dev, 1, RTC_AF); + + return IRQ_HANDLED; +} + +static irqreturn_t rtclong1_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct platform_device *pdev = (struct platform_device *)dev_id; + struct rtc_device *rtc = platform_get_drvdata(pdev); + unsigned long count = periodic_count; + + rtc2_write(RTCINTREG, RTCLONG1_INT); + + rtc1_write(RTCL1LREG, count); + rtc1_write(RTCL1HREG, count >> 16); + + rtc_update_irq(&rtc->class_dev, 1, RTC_PF); + + return IRQ_HANDLED; +} + +static struct rtc_class_ops vr41xx_rtc_ops = { + .release = vr41xx_rtc_release, + .ioctl = vr41xx_rtc_ioctl, + .read_time = vr41xx_rtc_read_time, + .set_time = vr41xx_rtc_set_time, + .read_alarm = vr41xx_rtc_read_alarm, + .set_alarm = vr41xx_rtc_set_alarm, +}; + +static int __devinit rtc_probe(struct platform_device *pdev) +{ + struct rtc_device *rtc; + unsigned int irq; + int retval; + + if (pdev->num_resources != 2) + return -EBUSY; + + rtc1_base = ioremap(pdev->resource[0].start, RTC1_SIZE); + if (rtc1_base == NULL) + return -EBUSY; + + rtc2_base = ioremap(pdev->resource[1].start, RTC2_SIZE); + if (rtc2_base == NULL) { + iounmap(rtc1_base); + rtc1_base = NULL; + return -EBUSY; + } + + rtc = rtc_device_register(rtc_name, &pdev->dev, &vr41xx_rtc_ops, THIS_MODULE); + if (IS_ERR(rtc)) { + iounmap(rtc1_base); + iounmap(rtc2_base); + rtc1_base = NULL; + rtc2_base = NULL; + return PTR_ERR(rtc); + } + + spin_lock_irq(&rtc_lock); + + rtc1_write(ECMPLREG, 0); + rtc1_write(ECMPMREG, 0); + rtc1_write(ECMPHREG, 0); + rtc1_write(RTCL1LREG, 0); + rtc1_write(RTCL1HREG, 0); + + spin_unlock_irq(&rtc_lock); + + irq = ELAPSEDTIME_IRQ; + retval = request_irq(irq, elapsedtime_interrupt, SA_INTERRUPT, + "elapsed_time", pdev); + if (retval == 0) { + irq = RTCLONG1_IRQ; + retval = request_irq(irq, rtclong1_interrupt, SA_INTERRUPT, + "rtclong1", pdev); + } + + if (retval < 0) { + printk(KERN_ERR "rtc: IRQ%d is busy\n", irq); + rtc_device_unregister(rtc); + if (irq == RTCLONG1_IRQ) + free_irq(ELAPSEDTIME_IRQ, NULL); + iounmap(rtc1_base); + iounmap(rtc2_base); + rtc1_base = NULL; + rtc2_base = NULL; + return retval; + } + + platform_set_drvdata(pdev, rtc); + + disable_irq(ELAPSEDTIME_IRQ); + disable_irq(RTCLONG1_IRQ); + + printk(KERN_INFO "rtc: Real Time Clock of NEC VR4100 series\n"); + + return 0; +} + +static int __devexit rtc_remove(struct platform_device *pdev) +{ + struct rtc_device *rtc; + + rtc = platform_get_drvdata(pdev); + if (rtc != NULL) + rtc_device_unregister(rtc); + + platform_set_drvdata(pdev, NULL); + + free_irq(ELAPSEDTIME_IRQ, NULL); + free_irq(RTCLONG1_IRQ, NULL); + if (rtc1_base != NULL) + iounmap(rtc1_base); + if (rtc2_base != NULL) + iounmap(rtc2_base); + + return 0; +} + +static struct platform_device *rtc_platform_device; + +static struct platform_driver rtc_platform_driver = { + .probe = rtc_probe, + .remove = __devexit_p(rtc_remove), + .driver = { + .name = rtc_name, + .owner = THIS_MODULE, + }, +}; + +static int __init vr41xx_rtc_init(void) +{ + int retval; + + switch (current_cpu_data.cputype) { + case CPU_VR4111: + case CPU_VR4121: + rtc_resource[0].start = RTC1_TYPE1_START; + rtc_resource[0].end = RTC1_TYPE1_END; + rtc_resource[1].start = RTC2_TYPE1_START; + rtc_resource[1].end = RTC2_TYPE1_END; + break; + case CPU_VR4122: + case CPU_VR4131: + case CPU_VR4133: + rtc_resource[0].start = RTC1_TYPE2_START; + rtc_resource[0].end = RTC1_TYPE2_END; + rtc_resource[1].start = RTC2_TYPE2_START; + rtc_resource[1].end = RTC2_TYPE2_END; + break; + default: + return -ENODEV; + break; + } + + rtc_platform_device = platform_device_alloc("RTC", -1); + if (rtc_platform_device == NULL) + return -ENOMEM; + + retval = platform_device_add_resources(rtc_platform_device, + rtc_resource, ARRAY_SIZE(rtc_resource)); + + if (retval == 0) + retval = platform_device_add(rtc_platform_device); + + if (retval < 0) { + platform_device_put(rtc_platform_device); + return retval; + } + + retval = platform_driver_register(&rtc_platform_driver); + if (retval < 0) + platform_device_unregister(rtc_platform_device); + + return retval; +} + +static void __exit vr41xx_rtc_exit(void) +{ + platform_driver_unregister(&rtc_platform_driver); + platform_device_unregister(rtc_platform_device); +} + +module_init(vr41xx_rtc_init); +module_exit(vr41xx_rtc_exit);