S3C2440 rtc 平台设备驱动 卸载问题 oops
S3C2440 rtc 平台设备驱动 卸载问题 oops
(1)rtc平台设备驱动源码如下,gzliu_2440_rtc.c:
相关的函数及结构体参见:
- #include <linux/module.h>
- #include <linux/fs.h>
- #include <linux/string.h>
- #include <linux/init.h>
- #include <linux/device.h>
- #include <linux/interrupt.h>
- #include <linux/rtc.h>
- #include <linux/bcd.h>
- #include <asm/hardware.h>
- #include <asm/uaccess.h>
- #include <asm/io.h>
- #include <asm/irq.h>
- #include <asm/rtc.h>
- #include <asm/mach/time.h>
- #include <asm/hardware/clock.h>
- #include <asm/arch/regs-rtc.h>
- // 包含RTC_AF的声明
- #include <linux/mc146818rtc.h>
- #undef S3C24XX_VA_RTC
- #define S3C24XX_VA_RTC s3c2440_rtc_base
- static struct resource *s3c2440_rtc_mem = NULL;
- static void __iomem *s3c2440_rtc_base = NULL;
- static int s3c2440_rtc_alarm_irq = NO_IRQ;
- static int s3c2440_rtc_tick_irq = NO_IRQ;
- static int s3c2440_rtc_freq = 1; // rtc tick中断频率
- static DEFINE_SPINLOCK(s3c2440_rtc_pie_lock);
- static int s3c2440_rtc_proc(char *buf)
- {
- unsigned int rtcalm = readb(S3C2410_RTCALM);
- unsigned int ticnt = readb (S3C2410_TICNT);
- char *p = buf;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_proc()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- p += sprintf(p, "alarm_IRQ\t: %s\n", (rtcalm & S3C2410_RTCALM_ALMEN) ? "yes" : "no" );
- p += sprintf(p, "periodic_IRQ\t: %s\n", (ticnt & S3C2410_TICNT_ENABLE) ? "yes" : "no" );
- p += sprintf(p, "periodic_freq\t: %d\n", s3c2440_rtc_freq);
- return p - buf;
- }
- static int s3c2440_rtc_getalarm(struct rtc_wkalrm *alrm)
- {
- struct rtc_time *alm_tm = &alrm->time;
- unsigned int alm_en;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_getalarm()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- alm_tm->tm_sec = readb(S3C2410_ALMSEC);
- alm_tm->tm_min = readb(S3C2410_ALMMIN);
- alm_tm->tm_hour = readb(S3C2410_ALMHOUR);
- alm_tm->tm_mon = readb(S3C2410_ALMMON);
- alm_tm->tm_mday = readb(S3C2410_ALMDATE);
- alm_tm->tm_year = readb(S3C2410_ALMYEAR);
- alm_en = readb(S3C2410_RTCALM);
- pr_debug("read alarm %02x %02x.%02x.%02x %02x/%02x/%02x\n", alm_en, alm_tm->tm_year, alm_tm->tm_mon, alm_tm->tm_mday, alm_tm->tm_hour, alm_tm->tm_min, alm_tm->tm_sec);
- /* decode the alarm enable field */
- if (alm_en & S3C2410_RTCALM_SECEN)
- {
- BCD_TO_BIN(alm_tm->tm_sec);
- }
- else
- {
- alm_tm->tm_sec = 0xff;
- }
- if (alm_en & S3C2410_RTCALM_MINEN)
- {
- BCD_TO_BIN(alm_tm->tm_min);
- }
- else
- {
- alm_tm->tm_min = 0xff;
- }
- if (alm_en & S3C2410_RTCALM_HOUREN)
- {
- BCD_TO_BIN(alm_tm->tm_hour);
- }
- else
- {
- alm_tm->tm_hour = 0xff;
- }
- if (alm_en & S3C2410_RTCALM_DAYEN)
- {
- BCD_TO_BIN(alm_tm->tm_mday);
- }
- else
- {
- alm_tm->tm_mday = 0xff;
- }
- if (alm_en & S3C2410_RTCALM_MONEN)
- {
- BCD_TO_BIN(alm_tm->tm_mon);
- alm_tm->tm_mon -= 1;
- }
- else
- {
- alm_tm->tm_mon = 0xff;
- }
- if (alm_en & S3C2410_RTCALM_YEAREN)
- {
- BCD_TO_BIN(alm_tm->tm_year);
- }
- else
- {
- alm_tm->tm_year = 0xffff;
- }
- /* todo - set alrm->enabled ? */
- return 0;
- }/* s3c2440_rtc_getalarm(struct rtc_wkalrm *alrm) */
- static int s3c2440_rtc_setalarm(struct rtc_wkalrm *alrm)
- {
- struct rtc_time *tm = &alrm->time;
- unsigned int alrm_en;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setalarm()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- pr_debug("s3c2410_rtc_setalarm: %d, %02x/%02x/%02x %02x.%02x.%02x\n", alrm->enabled, tm->tm_mday & 0xff, tm->tm_mon & 0xff, tm->tm_year & 0xff, tm->tm_hour & 0xff, tm->tm_min & 0xff, tm->tm_sec);
- if (alrm->enabled || 1)
- {
- alrm_en = readb(S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
- writeb(0x00, S3C2410_RTCALM);
- if (tm->tm_sec < 60 && tm->tm_sec >= 0)
- {
- alrm_en |= S3C2410_RTCALM_SECEN;
- writeb(BIN2BCD(tm->tm_sec), S3C2410_ALMSEC);
- }
- if (tm->tm_min < 60 && tm->tm_min >= 0)
- {
- alrm_en |= S3C2410_RTCALM_MINEN;
- writeb(BIN2BCD(tm->tm_min), S3C2410_ALMMIN);
- }
- if (tm->tm_hour < 24 && tm->tm_hour >= 0)
- {
- alrm_en |= S3C2410_RTCALM_HOUREN;
- writeb(BIN2BCD(tm->tm_hour), S3C2410_ALMHOUR);
- }
- pr_debug("setting S3C2410_RTCALM to %08x\n", alrm_en);
- writeb(alrm_en, S3C2410_RTCALM);
- enable_irq_wake(s3c2440_rtc_alarm_irq);
- }
- else
- {
- alrm_en = readb(S3C2410_RTCALM);
- alrm_en &= ~S3C2410_RTCALM_ALMEN;
- writeb(alrm_en, S3C2410_RTCALM);
- disable_irq_wake(s3c2440_rtc_alarm_irq);
- }
- return 0;
- }/* s3c2440_rtc_setalarm(struct rtc_wkalrm *alrm) */
- /* Time read/write */
- static int s3c2440_rtc_gettime(struct rtc_time *rtc_tm)
- {
- unsigned int have_retried = 0;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_gettime()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- retry_get_time:
- rtc_tm->tm_min = readb(S3C2410_RTCMIN);
- rtc_tm->tm_hour = readb(S3C2410_RTCHOUR);
- rtc_tm->tm_mday = readb(S3C2410_RTCDATE);
- rtc_tm->tm_mon = readb(S3C2410_RTCMON);
- rtc_tm->tm_year = readb(S3C2410_RTCYEAR);
- rtc_tm->tm_sec = readb(S3C2410_RTCSEC);
- /* the only way to work out wether the system was mid-update
- * when we read it is to check the second counter, and if it
- * is zero, then we re-try the entire read
- */
- if (rtc_tm->tm_sec == 0 && !have_retried)
- {
- have_retried = 1;
- goto retry_get_time;
- }
- pr_debug("read time %02x.%02x.%02x %02x/%02x/%02x\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
- printk("before BCD_TO_BIN: %d-%d-%d %d:%d:%d\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
- BCD_TO_BIN(rtc_tm->tm_sec);
- BCD_TO_BIN(rtc_tm->tm_min);
- BCD_TO_BIN(rtc_tm->tm_hour);
- BCD_TO_BIN(rtc_tm->tm_mday);
- BCD_TO_BIN(rtc_tm->tm_mon);
- BCD_TO_BIN(rtc_tm->tm_year);
- printk("after BCD_TO_BIN: %d-%d-%d %d:%d:%d\n", rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec);
- // 要保证rtc_tm->tm_year + 1900 == 2011年,rtc_tm->tm_mon + 1 == 8月
- rtc_tm->tm_year += 100;
- rtc_tm->tm_mon -= 1;
- return 0;
- }/* s3c2440_rtc_gettime(struct rtc_time *rtc_tm) */
- static int s3c2440_rtc_settime(struct rtc_time *tm)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_settime()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- /* the rtc gets round the y2k problem by just not supporting it */
- if (tm->tm_year < 100)
- return -EINVAL;
- printk("before BIN2BCD: %d-%d-%d %d:%d:%d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec);
- writeb(BIN2BCD(tm->tm_sec), S3C2410_RTCSEC);
- writeb(BIN2BCD(tm->tm_min), S3C2410_RTCMIN);
- writeb(BIN2BCD(tm->tm_hour), S3C2410_RTCHOUR);
- writeb(BIN2BCD(tm->tm_mday), S3C2410_RTCDATE);
- writeb(BIN2BCD(tm->tm_mon + 1), S3C2410_RTCMON);
- writeb(BIN2BCD(tm->tm_year - 100), S3C2410_RTCYEAR);
- return 0;
- }
- /* Update control registers */
- static void s3c2440_rtc_setaie(int to)
- {
- unsigned int tmp;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setaie()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- pr_debug("%s: aie=%d\n", __FUNCTION__, to);
- tmp = readb(S3C2410_RTCALM);
- if (to)
- {
- tmp |= S3C2410_RTCALM_ALMEN;
- }
- else
- {
- tmp &= ~S3C2410_RTCALM_ALMEN;
- }
- writeb(tmp, S3C2410_RTCALM);
- }
- static void s3c2440_rtc_setfreq(int freq)
- {
- unsigned int tmp;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setfreq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- spin_lock_irq(&s3c2440_rtc_pie_lock);
- tmp = readb(S3C2410_TICNT) & S3C2410_TICNT_ENABLE;
- s3c2440_rtc_freq = freq;
- tmp |= (128 / freq)-1;
- writeb(tmp, S3C2410_TICNT);
- spin_unlock_irq(&s3c2440_rtc_pie_lock);
- }/* s3c2440_rtc_setfreq(int freq) */
- static void s3c2440_rtc_setpie(int to)
- {
- unsigned int tmp;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_setpie()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- pr_debug("%s: pie=%d\n", __FUNCTION__, to);
- spin_lock_irq(&s3c2440_rtc_pie_lock);
- tmp = readb(S3C2410_TICNT) & ~S3C2410_TICNT_ENABLE;
- if (to)
- {
- tmp |= S3C2410_TICNT_ENABLE;
- }
- writeb(tmp, S3C2410_TICNT);
- spin_unlock_irq(&s3c2440_rtc_pie_lock);
- }
- static int s3c2440_rtc_ioctl(unsigned int cmd, unsigned long arg)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_ioctl()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- switch (cmd)
- {
- case RTC_AIE_OFF:
- case RTC_AIE_ON:
- s3c2440_rtc_setaie((cmd == RTC_AIE_ON) ? 1 : 0);
- return 0;
- case RTC_PIE_OFF:
- case RTC_PIE_ON:
- s3c2440_rtc_setpie((cmd == RTC_PIE_ON) ? 1 : 0);
- return 0;
- case RTC_IRQP_READ:
- return put_user(s3c2440_rtc_freq, (unsigned long __user *)arg);
- case RTC_IRQP_SET:
- if (arg < 1 || arg > 64)
- return -EINVAL;
- if (!capable(CAP_SYS_RESOURCE))
- return -EACCES;
- /* check for power of 2 */
- if ((arg & (arg-1)) != 0)
- return -EINVAL;
- pr_debug("s3c2440_rtc: setting frequency %ld\n", arg);
- s3c2440_rtc_setfreq(arg);
- return 0;
- case RTC_UIE_ON:
- case RTC_UIE_OFF:
- return -EINVAL;
- }/* switch (cmd) */
- return -EINVAL;
- }/* s3c2440_rtc_ioctl(unsigned int cmd, unsigned long arg) */
- static irqreturn_t s3c2440_rtc_alarmirq(int irq, void *id, struct pt_regs *r)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_alarmirq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- rtc_update(1, RTC_AF | RTC_IRQF);
- return IRQ_HANDLED;
- }
- static irqreturn_t s3c2440_rtc_tickirq(int irq, void *id, struct pt_regs *r)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_tickirq()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- rtc_update(1, RTC_PF | RTC_IRQF);
- return IRQ_HANDLED;
- }
- static int s3c2440_rtc_open(void)
- {
- int ret;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_open()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- ret = request_irq(s3c2440_rtc_alarm_irq, s3c2440_rtc_alarmirq, SA_INTERRUPT, "s3c2440-rtc alarm", NULL);
- if (ret)
- {
- printk(KERN_ERR "IRQ%d already in use\n", s3c2440_rtc_alarm_irq);
- }
- ret = request_irq(s3c2440_rtc_tick_irq, s3c2440_rtc_tickirq, SA_INTERRUPT, "s3c2440-rtc tick", NULL);
- if (ret)
- {
- printk(KERN_ERR "IRQ%d already in use\n", s3c2440_rtc_tick_irq);
- goto tick_err;
- }
- return ret;
- tick_err:
- free_irq(s3c2440_rtc_alarm_irq, NULL);
- return ret;
- }/* s3c2440_rtc_open(void) */
- static void s3c2440_rtc_release(void)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_release()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- /* do not clear AIE here, it may be needed for wake */
- s3c2440_rtc_setpie(0);
- free_irq(s3c2440_rtc_alarm_irq, NULL);
- free_irq(s3c2440_rtc_tick_irq, NULL);
- }
- static struct rtc_ops s3c2440_rtcops =
- {
- .owner = THIS_MODULE,
- .open = s3c2440_rtc_open,
- .release = s3c2440_rtc_release,
- .ioctl = s3c2440_rtc_ioctl,
- .read_time = s3c2440_rtc_gettime,
- .set_time = s3c2440_rtc_settime,
- .read_alarm = s3c2440_rtc_getalarm,
- .set_alarm = s3c2440_rtc_setalarm,
- .proc = s3c2440_rtc_proc,
- };
- static void s3c2440_rtc_enable(struct device *dev, int en)
- {
- unsigned int tmp;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_enable()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- if (s3c2440_rtc_base == NULL)
- {
- return;
- }
- if (!en)
- {
- tmp = readb(S3C2410_RTCCON);
- writeb(tmp & ~S3C2410_RTCCON_RTCEN, S3C2410_RTCCON);
- tmp = readb(S3C2410_TICNT);
- writeb(tmp & ~S3C2410_TICNT_ENABLE, S3C2410_TICNT);
- }
- else
- {
- /* re-enable the device, and check it is ok */
- if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_RTCEN) == 0)
- {
- dev_info(dev, "rtc disabled, re-enabling\n");
- tmp = readb(S3C2410_RTCCON);
- writeb(tmp | S3C2410_RTCCON_RTCEN , S3C2410_RTCCON);
- }
- if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CNTSEL))
- {
- dev_info(dev, "removing S3C2410_RTCCON_CNTSEL\n");
- tmp = readb(S3C2410_RTCCON);
- writeb(tmp& ~S3C2410_RTCCON_CNTSEL , S3C2410_RTCCON);
- }
- if ((readb(S3C2410_RTCCON) & S3C2410_RTCCON_CLKRST))
- {
- dev_info(dev, "removing S3C2410_RTCCON_CLKRST\n");
- tmp = readb(S3C2410_RTCCON);
- writeb(tmp & ~S3C2410_RTCCON_CLKRST, S3C2410_RTCCON);
- }
- }
- }/* s3c2440_rtc_enable(struct device *dev, int en) */
- static int s3c2440_rtc_probe(struct device *dev)
- {
- struct platform_device *pdev = to_platform_device(dev);
- struct resource *res;
- int ret;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_probe()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- pr_debug("%s: probe=%p, device=%p\n", __FUNCTION__, pdev, dev);
- /* find the IRQs */
- /*
- * platform_get_irq()原型:
- * 文件 drivers/base/platform.c
- * int platform_get_irq(struct platform_device *dev, unsigned int num)
- * {
- * struct resource *r = platform_get_resource(dev, IORESOURCE_IRQ, num);
- *
- * return r ? r->start : 0;
- * }
- * 其中platform_get_resource(dev, IORESOURCE_IRQ, num)获取第num个flags与IORESOURCE_IRQ匹配的资源,
- * rtc资源结构体如下,num为1与[2]对应,num为0与[1]对应。
- * 文件 arch/arm/mach-s3c2410/devs.c
- * static struct resource s3c_rtc_resource[] = {
- * [0] = {
- * .start = S3C2410_PA_RTC,
- * .end = S3C2410_PA_RTC + 0xff,
- * .flags = IORESOURCE_MEM,
- * },
- * [1] = {
- * .start = IRQ_RTC,
- .end = IRQ_RTC,
- .flags = IORESOURCE_IRQ,
- * },
- * [2] = {
- * .start = IRQ_TICK,
- * .end = IRQ_TICK,
- * .flags = IORESOURCE_IRQ
- * }
- * };
- * 也可直接使用IRQ_RTC,IRQ_TICK对s3c2440_rtc_alarm_irq和s3c2440_rtc_tick_irq赋值。
- */
- s3c2440_rtc_tick_irq = platform_get_irq(pdev, 1);
- if (s3c2440_rtc_tick_irq <= 0)
- {
- dev_err(dev, "no irq for rtc tick\n");
- return -ENOENT;
- }
- s3c2440_rtc_alarm_irq = platform_get_irq(pdev, 0);
- if (s3c2440_rtc_alarm_irq <= 0)
- {
- dev_err(dev, "no irq for alarm\n");
- return -ENOENT;
- }
- pr_debug("s3c2440_rtc: tick irq %d, alarm irq %d\n", s3c2440_rtc_tick_irq, s3c2440_rtc_alarm_irq);
- /* get the memory region */
- /*
- * 文件 include/linux/ioport.h
- * resource结构体的定义:
- * struct resource {
- * const char *name;
- * unsigned long start, end;
- * unsigned long flags;
- * struct resource *parent, *sibling, *child;
- * };
- * platform_get_resource()函数原型:
- * 文件 drivers/base/platform.c
- * struct resource *platform_get_resource(struct platform_device *dev, unsigned int type, unsigned int num)
- * {
- * int i;
- * for (i = 0; i < dev->num_resources; i++) {
- * struct resource *r = &dev->resource[i];
- * if ((r->flags & (IORESOURCE_IO | IORESOURCE_MEM | IORESOURCE_IRQ | IORESOURCE_DMA)) == type)
- * if (num-- == 0)
- * return r;
- * }
- * return NULL;
- * }
- */
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (res == NULL)
- {
- dev_err(dev, "failed to get memory region resource\n");
- return -ENOENT;
- }
- /*
- * 文件 include/linux/ioport.h
- * #define request_mem_region(start,n,name) __request_region(&iomem_resource, (start), (n), (name))
- * 其中的iomem_resource:
- * 文件 kernel/resource.c
- * struct resource iomem_resource = {
- * .name = "PCI mem",
- * .start = 0UL,
- * .end = ~0UL,
- * .flags = IORESOURCE_MEM,
- * };
- */
- s3c2440_rtc_mem = request_mem_region(res->start, res->end-res->start+1, pdev->name);
- if (s3c2440_rtc_mem == NULL)
- {
- dev_err(dev, "failed to reserve memory region\n");
- ret = -ENOENT;
- goto exit_err;
- }
- s3c2440_rtc_base = ioremap(res->start, res->end - res->start + 1);
- if (s3c2440_rtc_base == NULL)
- {
- dev_err(dev, "failed ioremap()\n");
- ret = -EINVAL;
- goto exit_err;
- }
- // 是用linux源码中的s3c2410-rtc.c移植的,不知道为什么要写这么一行,没看出有什么用。
- //s3c2440_rtc_mem = res;
- // 导致卸载时出现"Internal error: Oops: 13 [#1]"
- pr_debug("s3c2440_rtc_base=%p\n", s3c2440_rtc_base);
- pr_debug("s3c2440_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
- /* check to see if everything is setup correctly */
- s3c2440_rtc_enable(dev, 1);
- pr_debug("s3c2440_rtc: RTCCON=%02x\n", readb(S3C2410_RTCCON));
- /*
- * s3c2440a手册中描述:
- * TICK TIME INTERRUPT
- * The RTC tick time is used for interrupt request. The TICNT register has an interrupt enable bit and the count value for
- * the interrupt. The count value reaches '0' when the tick time interrupt occurs. Then the period of interrupt is as
- * follows:
- * — Period = ( n+1 ) / 128 second
- * — n: Tick time count value (1~127)
- * 此函数将rtc的tick中断时间间隔设置为:(1/s3c2440_rtc_freq)second,即1s
- */
- s3c2440_rtc_setfreq(s3c2440_rtc_freq);
- // 注册rtc设备,并且创建/proc中的节点,将s3c2440_rtc_proc与该节点绑定。
- register_rtc(&s3c2440_rtcops);
- return 0;
- exit_err:
- dev_err(dev, "error %d during initialisation\n", ret);
- return ret;
- }/* s3c2440_rtc_probe(struct device *dev) */
- static int s3c2440_rtc_remove(struct device *dev)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_remove()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- unregister_rtc(&s3c2440_rtcops);
- // 0 - disable tick time interrupt
- s3c2440_rtc_setpie(0);
- // 0 - disable alarm
- s3c2440_rtc_setaie(0);
- if (s3c2440_rtc_mem != NULL)
- {
- pr_debug("s3c2440_rtc: releasing s3c2440_rtc_mem\n");
- iounmap(s3c2440_rtc_base);
- release_resource(s3c2440_rtc_mem);
- kfree(s3c2440_rtc_mem);
- }
- return 0;
- }
- #ifdef CONFIG_PM
- /* S3C2440 RTC 电源管理控制 */
- static struct timespec s3c2440_rtc_delta;
- static int ticnt_save;
- static int s3c2440_rtc_suspend(struct device *dev, pm_message_t state, u32 level)
- {
- struct rtc_time tm;
- struct timespec time;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_suspend()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- time.tv_nsec = 0;
- if (level == SUSPEND_POWER_DOWN)
- {
- /* save TICNT for anyone using periodic interrupts */
- ticnt_save = readb(S3C2410_TICNT);
- /* calculate time delta for suspend */
- s3c2440_rtc_gettime(&tm);
- rtc_tm_to_time(&tm, &time.tv_sec);
- save_time_delta(&s3c2440_rtc_delta, &time);
- s3c2440_rtc_enable(dev, 0);
- }
- return 0;
- }
- static int s3c2440_rtc_resume(struct device *dev, u32 level)
- {
- struct rtc_time tm;
- struct timespec time;
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_resume()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- time.tv_nsec = 0;
- s3c2440_rtc_enable(dev, 1);
- s3c2440_rtc_gettime(&tm);
- rtc_tm_to_time(&tm, &time.tv_sec);
- restore_time_delta(&s3c2440_rtc_delta, &time);
- writeb(ticnt_save, S3C2410_TICNT);
- return 0;
- }
- #else
- #define s3c2440_rtc_suspend NULL
- #define s3c2440_rtc_resume NULL
- #endif
- static struct device_driver s3c2440_rtcdrv =
- {
- .name = "s3c2440-rtc",
- .bus = &platform_bus_type,
- .probe = s3c2440_rtc_probe,
- .remove = s3c2440_rtc_remove,
- .suspend = s3c2440_rtc_suspend,
- .resume = s3c2440_rtc_resume,
- };
- static int __init s3c2440_rtc_init(void)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_init()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- return driver_register(&s3c2440_rtcdrv);
- }
- static void __exit s3c2440_rtc_exit(void)
- {
- printk("@@@@@@@@@@@@@@@@@@@@@@\ngzliu s3c2440_rtc_exit()\n@@@@@@@@@@@@@@@@@@@@@@@@\n");
- driver_unregister(&s3c2440_rtcdrv);
- }
- module_init(s3c2440_rtc_init);
- module_exit(s3c2440_rtc_exit);
- MODULE_DESCRIPTION("S3C2440 RTC Driver");
- MODULE_AUTHOR("gzLiu, <gzliu_hit@qq.com>");
- MODULE_LICENSE("GPL");
(2)编译成模块形式,加载没问题,卸载时出现如下问题:
(3)经检查源码,发现问题处在上面源码中580行,注释掉就好了。
|
评论暂时关闭