linux4.1.36 2440 启用 RTC 支持
/drivers/rtc/rtc-s3c.c
822行
static struct platform_driver s3c_rtc_driver = {
.probe = s3c_rtc_probe,
.remove = s3c_rtc_remove,
.driver = {
.name = "s3c-rtc",
.pm = &s3c_rtc_pm_ops,
.of_match_table = of_match_ptr(s3c_rtc_dt_match),
},
};
module_platform_driver(s3c_rtc_driver);
/arch/arm/plat-samsung/devs.c
836行
static struct resource s3c_rtc_resource[] = {
[0] = DEFINE_RES_MEM(S3C24XX_PA_RTC, SZ_256),
[1] = DEFINE_RES_IRQ(IRQ_RTC),
[2] = DEFINE_RES_IRQ(IRQ_TICK),
};
struct platform_device s3c_device_rtc = {
.name = "s3c-rtc", //修改此处 和 s3c_rtc_driver 中的 .name 相同
.id = -1,
.num_resources = ARRAY_SIZE(s3c_rtc_resource),
.resource = s3c_rtc_resource,
};
修改 mach-smdk2440.c 中添加设备
static struct platform_device *smdk2440_devices[] __initdata = {
&s3c_device_ohci,
&s3c_device_lcd,
&s3c_device_wdt,
&s3c_device_i2c0,
&s3c_device_iis,
&dm9000_device_eth,
&s3c_device_rtc, //添加此项
};
make uImage 使用新内核 启动
错误信息
Unable to handle kernel NULL pointer dereference at virtual address 000000c0
pgd = c0004000
[000000c0] *pgd=00000000
Internal error: Oops: 5 [#1] ARM
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.1.36 #73
Hardware name: SMDK2440
task: c381faa0 ti: c3822000 task.ti: c3822000
PC is at s3c_rtc_probe+0x4c/0x3f0
LR is at s3c_rtc_probe+0x38/0x3f0
经过 printk 大法以后定位到 s3c_rtc_get_data() 出现空指针问题
static const struct of_device_id s3c_rtc_dt_match[];
static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
{
const struct of_device_id *match;
match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
return (struct s3c_rtc_data *)match->data;
}
改为
static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev)
{
const struct of_device_id *match;
match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node);
if(NULL != match)
{
return (struct s3c_rtc_data *)match->data;
}
return NULL;
}
改了以后，启动不报空指针错误了。但是还是不能用rtc 。
要自己实现这么一个函数
添加一个函数声明
static struct s3c_rtc_data *get_s3c_2410_data(void);
在最下面添加实现
static struct s3c_rtc_data *get_s3c_2410_data(void)
{
return (struct s3c_rtc_data *)&s3c2410_rtc_data;
}
rtc-s3c.c
/* drivers/rtc/rtc-s3c.c * * Copyright (c) 2010 Samsung Electronics Co., Ltd. * http://www.samsung.com/ * * Copyright (c) 2004,2006 Simtec Electronics * Ben Dooks, <ben@simtec.co.uk> * http://armlinux.simtec.co.uk/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * S3C2410/S3C2440/S3C24XX Internal RTC Driver */ #include <linux/module.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/interrupt.h> #include <linux/rtc.h> #include <linux/bcd.h> #include <linux/clk.h> #include <linux/log2.h> #include <linux/slab.h> #include <linux/of.h> #include <linux/uaccess.h> #include <linux/io.h> #include <asm/irq.h> #include "rtc-s3c.h" struct s3c_rtc { struct device *dev; struct rtc_device *rtc; void __iomem *base; struct clk *rtc_clk; struct clk *rtc_src_clk; bool clk_disabled; struct s3c_rtc_data *data; int irq_alarm; int irq_tick; spinlock_t pie_lock; spinlock_t alarm_clk_lock; int ticnt_save, ticnt_en_save; bool wake_en; }; struct s3c_rtc_data { int max_user_freq; bool needs_src_clk; void (*irq_handler) (struct s3c_rtc *info, int mask); void (*set_freq) (struct s3c_rtc *info, int freq); void (*enable_tick) (struct s3c_rtc *info, struct seq_file *seq); void (*select_tick_clk) (struct s3c_rtc *info); void (*save_tick_cnt) (struct s3c_rtc *info); void (*restore_tick_cnt) (struct s3c_rtc *info); void (*enable) (struct s3c_rtc *info); void (*disable) (struct s3c_rtc *info); }; static struct s3c_rtc_data *get_s3c_2410_data(void); static void s3c_rtc_enable_clk(struct s3c_rtc *info) { unsigned long irq_flags; spin_lock_irqsave(&info->alarm_clk_lock, irq_flags); if (info->clk_disabled) { clk_enable(info->rtc_clk); if (info->data->needs_src_clk) clk_enable(info->rtc_src_clk); info->clk_disabled = false; } spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags); } static void s3c_rtc_disable_clk(struct s3c_rtc *info) { unsigned long irq_flags; spin_lock_irqsave(&info->alarm_clk_lock, irq_flags); if (!info->clk_disabled) { if (info->data->needs_src_clk) clk_disable(info->rtc_src_clk); clk_disable(info->rtc_clk); info->clk_disabled = true; } spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags); } /* IRQ Handlers */ static irqreturn_t s3c_rtc_tickirq(int irq, void *id) { struct s3c_rtc *info = (struct s3c_rtc *)id; if (info->data->irq_handler) info->data->irq_handler(info, S3C2410_INTP_TIC); return IRQ_HANDLED; } static irqreturn_t s3c_rtc_alarmirq(int irq, void *id) { struct s3c_rtc *info = (struct s3c_rtc *)id; if (info->data->irq_handler) info->data->irq_handler(info, S3C2410_INTP_ALM); return IRQ_HANDLED; } /* Update control registers */ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled) { struct s3c_rtc *info = dev_get_drvdata(dev); unsigned int tmp; dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled); s3c_rtc_enable_clk(info); tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN; if (enabled) tmp |= S3C2410_RTCALM_ALMEN; writeb(tmp, info->base + S3C2410_RTCALM); s3c_rtc_disable_clk(info); if (enabled) s3c_rtc_enable_clk(info); else s3c_rtc_disable_clk(info); return 0; } /* Set RTC frequency */ static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq) { if (!is_power_of_2(freq)) return -EINVAL; s3c_rtc_enable_clk(info); spin_lock_irq(&info->pie_lock); if (info->data->set_freq) info->data->set_freq(info, freq); spin_unlock_irq(&info->pie_lock); s3c_rtc_disable_clk(info); return 0; } /* Time read/write */ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm) { struct s3c_rtc *info = dev_get_drvdata(dev); unsigned int have_retried = 0; s3c_rtc_enable_clk(info); retry_get_time: rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN); rtc_tm->tm_hour = readb(info->base + S3C2410_RTCHOUR); rtc_tm->tm_mday = readb(info->base + S3C2410_RTCDATE); rtc_tm->tm_mon = readb(info->base + S3C2410_RTCMON); rtc_tm->tm_year = readb(info->base + S3C2410_RTCYEAR); rtc_tm->tm_sec = readb(info->base + S3C2410_RTCSEC); /* the only way to work out whether 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; } rtc_tm->tm_sec = bcd2bin(rtc_tm->tm_sec); rtc_tm->tm_min = bcd2bin(rtc_tm->tm_min); rtc_tm->tm_hour = bcd2bin(rtc_tm->tm_hour); rtc_tm->tm_mday = bcd2bin(rtc_tm->tm_mday); rtc_tm->tm_mon = bcd2bin(rtc_tm->tm_mon); rtc_tm->tm_year = bcd2bin(rtc_tm->tm_year); s3c_rtc_disable_clk(info); rtc_tm->tm_year += 100; dev_dbg(dev, "read time %04d.%02d.%02d %02d:%02d:%02d\n", 1900 + rtc_tm->tm_year, rtc_tm->tm_mon, rtc_tm->tm_mday, rtc_tm->tm_hour, rtc_tm->tm_min, rtc_tm->tm_sec); rtc_tm->tm_mon -= 1; return rtc_valid_tm(rtc_tm); } static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm) { struct s3c_rtc *info = dev_get_drvdata(dev); int year = tm->tm_year - 100; dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n", 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec); /* we get around y2k by simply not supporting it */ if (year < 0 || year >= 100) { dev_err(dev, "rtc only supports 100 years\n"); return -EINVAL; } s3c_rtc_enable_clk(info); writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC); writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN); writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_RTCHOUR); writeb(bin2bcd(tm->tm_mday), info->base + S3C2410_RTCDATE); writeb(bin2bcd(tm->tm_mon + 1), info->base + S3C2410_RTCMON); writeb(bin2bcd(year), info->base + S3C2410_RTCYEAR); s3c_rtc_disable_clk(info); return 0; } static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm) { struct s3c_rtc *info = dev_get_drvdata(dev); struct rtc_time *alm_tm = &alrm->time; unsigned int alm_en; s3c_rtc_enable_clk(info); alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC); alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN); alm_tm->tm_hour = readb(info->base + S3C2410_ALMHOUR); alm_tm->tm_mon = readb(info->base + S3C2410_ALMMON); alm_tm->tm_mday = readb(info->base + S3C2410_ALMDATE); alm_tm->tm_year = readb(info->base + S3C2410_ALMYEAR); alm_en = readb(info->base + S3C2410_RTCALM); s3c_rtc_disable_clk(info); alrm->enabled = (alm_en & S3C2410_RTCALM_ALMEN) ? 1 : 0; dev_dbg(dev, "read alarm %d, %04d.%02d.%02d %02d:%02d:%02d\n", alm_en, 1900 + 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) alm_tm->tm_sec = bcd2bin(alm_tm->tm_sec); else alm_tm->tm_sec = -1; if (alm_en & S3C2410_RTCALM_MINEN) alm_tm->tm_min = bcd2bin(alm_tm->tm_min); else alm_tm->tm_min = -1; if (alm_en & S3C2410_RTCALM_HOUREN) alm_tm->tm_hour = bcd2bin(alm_tm->tm_hour); else alm_tm->tm_hour = -1; if (alm_en & S3C2410_RTCALM_DAYEN) alm_tm->tm_mday = bcd2bin(alm_tm->tm_mday); else alm_tm->tm_mday = -1; if (alm_en & S3C2410_RTCALM_MONEN) { alm_tm->tm_mon = bcd2bin(alm_tm->tm_mon); alm_tm->tm_mon -= 1; } else { alm_tm->tm_mon = -1; } if (alm_en & S3C2410_RTCALM_YEAREN) alm_tm->tm_year = bcd2bin(alm_tm->tm_year); else alm_tm->tm_year = -1; return 0; } static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm) { struct s3c_rtc *info = dev_get_drvdata(dev); struct rtc_time *tm = &alrm->time; unsigned int alrm_en; dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n", alrm->enabled, 1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday, tm->tm_hour, tm->tm_min, tm->tm_sec); s3c_rtc_enable_clk(info); alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN; writeb(0x00, info->base + S3C2410_RTCALM); if (tm->tm_sec < 60 && tm->tm_sec >= 0) { alrm_en |= S3C2410_RTCALM_SECEN; writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_ALMSEC); } if (tm->tm_min < 60 && tm->tm_min >= 0) { alrm_en |= S3C2410_RTCALM_MINEN; writeb(bin2bcd(tm->tm_min), info->base + S3C2410_ALMMIN); } if (tm->tm_hour < 24 && tm->tm_hour >= 0) { alrm_en |= S3C2410_RTCALM_HOUREN; writeb(bin2bcd(tm->tm_hour), info->base + S3C2410_ALMHOUR); } dev_dbg(dev, "setting S3C2410_RTCALM to %08x\n", alrm_en); writeb(alrm_en, info->base + S3C2410_RTCALM); s3c_rtc_disable_clk(info); s3c_rtc_setaie(dev, alrm->enabled); return 0; } static int s3c_rtc_proc(struct device *dev, struct seq_file *seq) { struct s3c_rtc *info = dev_get_drvdata(dev); s3c_rtc_enable_clk(info); if (info->data->enable_tick) info->data->enable_tick(info, seq); s3c_rtc_disable_clk(info); return 0; } static const struct rtc_class_ops s3c_rtcops = { .read_time = s3c_rtc_gettime, .set_time = s3c_rtc_settime, .read_alarm = s3c_rtc_getalarm, .set_alarm = s3c_rtc_setalarm, .proc = s3c_rtc_proc, .alarm_irq_enable = s3c_rtc_setaie, }; static void s3c24xx_rtc_enable(struct s3c_rtc *info) { unsigned int con, tmp; con = readw(info->base + S3C2410_RTCCON); /* re-enable the device, and check it is ok */ if ((con & S3C2410_RTCCON_RTCEN) == 0) { dev_info(info->dev, "rtc disabled, re-enabling\n"); tmp = readw(info->base + S3C2410_RTCCON); writew(tmp | S3C2410_RTCCON_RTCEN, info->base + S3C2410_RTCCON); } if (con & S3C2410_RTCCON_CNTSEL) { dev_info(info->dev, "removing RTCCON_CNTSEL\n"); tmp = readw(info->base + S3C2410_RTCCON); writew(tmp & ~S3C2410_RTCCON_CNTSEL, info->base + S3C2410_RTCCON); } if (con & S3C2410_RTCCON_CLKRST) { dev_info(info->dev, "removing RTCCON_CLKRST\n"); tmp = readw(info->base + S3C2410_RTCCON); writew(tmp & ~S3C2410_RTCCON_CLKRST, info->base + S3C2410_RTCCON); } } static void s3c24xx_rtc_disable(struct s3c_rtc *info) { unsigned int con; con = readw(info->base + S3C2410_RTCCON); con &= ~S3C2410_RTCCON_RTCEN; writew(con, info->base + S3C2410_RTCCON); con = readb(info->base + S3C2410_TICNT); con &= ~S3C2410_TICNT_ENABLE; writeb(con, info->base + S3C2410_TICNT); } static void s3c6410_rtc_disable(struct s3c_rtc *info) { unsigned int con; con = readw(info->base + S3C2410_RTCCON); con &= ~S3C64XX_RTCCON_TICEN; con &= ~S3C2410_RTCCON_RTCEN; writew(con, info->base + S3C2410_RTCCON); } static int s3c_rtc_remove(struct platform_device *pdev) { struct s3c_rtc *info = platform_get_drvdata(pdev); s3c_rtc_setaie(info->dev, 0); clk_unprepare(info->rtc_clk); info->rtc_clk = NULL; return 0; } static const struct of_device_id s3c_rtc_dt_match[]; static struct s3c_rtc_data *s3c_rtc_get_data(struct platform_device *pdev) { const struct of_device_id *match; match = of_match_node(s3c_rtc_dt_match, pdev->dev.of_node); if(NULL != match) { return (struct s3c_rtc_data *)match->data; } return NULL; } static int s3c_rtc_probe(struct platform_device *pdev) { struct s3c_rtc *info = NULL; struct rtc_time rtc_tm; struct resource *res; int ret; info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; /* find the IRQs */ info->irq_tick = platform_get_irq(pdev, 1); if (info->irq_tick < 0) { dev_err(&pdev->dev, "no irq for rtc tick\n"); return info->irq_tick; } info->dev = &pdev->dev; //改为自己实现的函数 //info->data = s3c_rtc_get_data(pdev); info->data = get_s3c_2410_data(); if (!info->data) { dev_err(&pdev->dev, "failed getting s3c_rtc_data\n"); return -EINVAL; } spin_lock_init(&info->pie_lock); spin_lock_init(&info->alarm_clk_lock); platform_set_drvdata(pdev, info); info->irq_alarm = platform_get_irq(pdev, 0); if (info->irq_alarm < 0) { dev_err(&pdev->dev, "no irq for alarm\n"); return info->irq_alarm; } dev_dbg(&pdev->dev, "s3c2410_rtc: tick irq %d, alarm irq %d\n", info->irq_tick, info->irq_alarm); /* get the memory region */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(info->base)) return PTR_ERR(info->base); info->rtc_clk = devm_clk_get(&pdev->dev, "rtc"); if (IS_ERR(info->rtc_clk)) { dev_err(&pdev->dev, "failed to find rtc clock\n"); return PTR_ERR(info->rtc_clk); } clk_prepare_enable(info->rtc_clk); if (info->data->needs_src_clk) { info->rtc_src_clk = devm_clk_get(&pdev->dev, "rtc_src"); if (IS_ERR(info->rtc_src_clk)) { dev_err(&pdev->dev, "failed to find rtc source clock\n"); return PTR_ERR(info->rtc_src_clk); } clk_prepare_enable(info->rtc_src_clk); } /* check to see if everything is setup correctly */ if (info->data->enable) info->data->enable(info); dev_dbg(&pdev->dev, "s3c2410_rtc: RTCCON=%02x\n", readw(info->base + S3C2410_RTCCON)); device_init_wakeup(&pdev->dev, 1); /* Check RTC Time */ if (s3c_rtc_gettime(&pdev->dev, &rtc_tm)) { rtc_tm.tm_year = 100; rtc_tm.tm_mon = 0; rtc_tm.tm_mday = 1; rtc_tm.tm_hour = 0; rtc_tm.tm_min = 0; rtc_tm.tm_sec = 0; s3c_rtc_settime(&pdev->dev, &rtc_tm); dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n"); } /* register RTC and exit */ info->rtc = devm_rtc_device_register(&pdev->dev, "s3c", &s3c_rtcops, THIS_MODULE); if (IS_ERR(info->rtc)) { dev_err(&pdev->dev, "cannot attach rtc\n"); ret = PTR_ERR(info->rtc); goto err_nortc; } ret = devm_request_irq(&pdev->dev, info->irq_alarm, s3c_rtc_alarmirq, 0, "s3c2410-rtc alarm", info); if (ret) { dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_alarm, ret); goto err_nortc; } ret = devm_request_irq(&pdev->dev, info->irq_tick, s3c_rtc_tickirq, 0, "s3c2410-rtc tick", info); if (ret) { dev_err(&pdev->dev, "IRQ%d error %d\n", info->irq_tick, ret); goto err_nortc; } if (info->data->select_tick_clk) info->data->select_tick_clk(info); s3c_rtc_setfreq(info, 1); s3c_rtc_disable_clk(info); return 0; err_nortc: if (info->data->disable) info->data->disable(info); if (info->data->needs_src_clk) clk_disable_unprepare(info->rtc_src_clk); clk_disable_unprepare(info->rtc_clk); return ret; } #ifdef CONFIG_PM_SLEEP static int s3c_rtc_suspend(struct device *dev) { struct s3c_rtc *info = dev_get_drvdata(dev); s3c_rtc_enable_clk(info); /* save TICNT for anyone using periodic interrupts */ if (info->data->save_tick_cnt) info->data->save_tick_cnt(info); if (info->data->disable) info->data->disable(info); if (device_may_wakeup(dev) && !info->wake_en) { if (enable_irq_wake(info->irq_alarm) == 0) info->wake_en = true; else dev_err(dev, "enable_irq_wake failed\n"); } return 0; } static int s3c_rtc_resume(struct device *dev) { struct s3c_rtc *info = dev_get_drvdata(dev); if (info->data->enable) info->data->enable(info); if (info->data->restore_tick_cnt) info->data->restore_tick_cnt(info); s3c_rtc_disable_clk(info); if (device_may_wakeup(dev) && info->wake_en) { disable_irq_wake(info->irq_alarm); info->wake_en = false; } return 0; } #endif static SIMPLE_DEV_PM_OPS(s3c_rtc_pm_ops, s3c_rtc_suspend, s3c_rtc_resume); static void s3c24xx_rtc_irq(struct s3c_rtc *info, int mask) { rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); } static void s3c6410_rtc_irq(struct s3c_rtc *info, int mask) { rtc_update_irq(info->rtc, 1, RTC_AF | RTC_IRQF); writeb(mask, info->base + S3C2410_INTP); } static void s3c2410_rtc_setfreq(struct s3c_rtc *info, int freq) { unsigned int tmp = 0; int val; tmp = readb(info->base + S3C2410_TICNT); tmp &= S3C2410_TICNT_ENABLE; val = (info->rtc->max_user_freq / freq) - 1; tmp |= val; writel(tmp, info->base + S3C2410_TICNT); } static void s3c2416_rtc_setfreq(struct s3c_rtc *info, int freq) { unsigned int tmp = 0; int val; tmp = readb(info->base + S3C2410_TICNT); tmp &= S3C2410_TICNT_ENABLE; val = (info->rtc->max_user_freq / freq) - 1; tmp |= S3C2443_TICNT_PART(val); writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); writel(S3C2416_TICNT2_PART(val), info->base + S3C2416_TICNT2); writel(tmp, info->base + S3C2410_TICNT); } static void s3c2443_rtc_setfreq(struct s3c_rtc *info, int freq) { unsigned int tmp = 0; int val; tmp = readb(info->base + S3C2410_TICNT); tmp &= S3C2410_TICNT_ENABLE; val = (info->rtc->max_user_freq / freq) - 1; tmp |= S3C2443_TICNT_PART(val); writel(S3C2443_TICNT1_PART(val), info->base + S3C2443_TICNT1); writel(tmp, info->base + S3C2410_TICNT); } static void s3c6410_rtc_setfreq(struct s3c_rtc *info, int freq) { int val; val = (info->rtc->max_user_freq / freq) - 1; writel(val, info->base + S3C2410_TICNT); } static void s3c24xx_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) { unsigned int ticnt; ticnt = readb(info->base + S3C2410_TICNT); ticnt &= S3C2410_TICNT_ENABLE; seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); } static void s3c2416_rtc_select_tick_clk(struct s3c_rtc *info) { unsigned int con; con = readw(info->base + S3C2410_RTCCON); con |= S3C2443_RTCCON_TICSEL; writew(con, info->base + S3C2410_RTCCON); } static void s3c6410_rtc_enable_tick(struct s3c_rtc *info, struct seq_file *seq) { unsigned int ticnt; ticnt = readw(info->base + S3C2410_RTCCON); ticnt &= S3C64XX_RTCCON_TICEN; seq_printf(seq, "periodic_IRQ\t: %s\n", ticnt ? "yes" : "no"); } static void s3c24xx_rtc_save_tick_cnt(struct s3c_rtc *info) { info->ticnt_save = readb(info->base + S3C2410_TICNT); } static void s3c24xx_rtc_restore_tick_cnt(struct s3c_rtc *info) { writeb(info->ticnt_save, info->base + S3C2410_TICNT); } static void s3c6410_rtc_save_tick_cnt(struct s3c_rtc *info) { info->ticnt_en_save = readw(info->base + S3C2410_RTCCON); info->ticnt_en_save &= S3C64XX_RTCCON_TICEN; info->ticnt_save = readl(info->base + S3C2410_TICNT); } static void s3c6410_rtc_restore_tick_cnt(struct s3c_rtc *info) { unsigned int con; writel(info->ticnt_save, info->base + S3C2410_TICNT); if (info->ticnt_en_save) { con = readw(info->base + S3C2410_RTCCON); writew(con | info->ticnt_en_save, info->base + S3C2410_RTCCON); } } static struct s3c_rtc_data const s3c2410_rtc_data = { .max_user_freq = 128, .irq_handler = s3c24xx_rtc_irq, .set_freq = s3c2410_rtc_setfreq, .enable_tick = s3c24xx_rtc_enable_tick, .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, .enable = s3c24xx_rtc_enable, .disable = s3c24xx_rtc_disable, }; static struct s3c_rtc_data const s3c2416_rtc_data = { .max_user_freq = 32768, .irq_handler = s3c24xx_rtc_irq, .set_freq = s3c2416_rtc_setfreq, .enable_tick = s3c24xx_rtc_enable_tick, .select_tick_clk = s3c2416_rtc_select_tick_clk, .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, .enable = s3c24xx_rtc_enable, .disable = s3c24xx_rtc_disable, }; static struct s3c_rtc_data const s3c2443_rtc_data = { .max_user_freq = 32768, .irq_handler = s3c24xx_rtc_irq, .set_freq = s3c2443_rtc_setfreq, .enable_tick = s3c24xx_rtc_enable_tick, .select_tick_clk = s3c2416_rtc_select_tick_clk, .save_tick_cnt = s3c24xx_rtc_save_tick_cnt, .restore_tick_cnt = s3c24xx_rtc_restore_tick_cnt, .enable = s3c24xx_rtc_enable, .disable = s3c24xx_rtc_disable, }; static struct s3c_rtc_data const s3c6410_rtc_data = { .max_user_freq = 32768, .needs_src_clk = true, .irq_handler = s3c6410_rtc_irq, .set_freq = s3c6410_rtc_setfreq, .enable_tick = s3c6410_rtc_enable_tick, .save_tick_cnt = s3c6410_rtc_save_tick_cnt, .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, .enable = s3c24xx_rtc_enable, .disable = s3c6410_rtc_disable, }; static struct s3c_rtc_data const exynos3250_rtc_data = { .max_user_freq = 32768, .needs_src_clk = true, .irq_handler = s3c6410_rtc_irq, .set_freq = s3c6410_rtc_setfreq, .enable_tick = s3c6410_rtc_enable_tick, .save_tick_cnt = s3c6410_rtc_save_tick_cnt, .restore_tick_cnt = s3c6410_rtc_restore_tick_cnt, .enable = s3c24xx_rtc_enable, .disable = s3c6410_rtc_disable, }; static struct s3c_rtc_data *get_s3c_2410_data(void) { return (struct s3c_rtc_data *)&s3c2410_rtc_data; } static const struct of_device_id s3c_rtc_dt_match[] = { { .compatible = "samsung,s3c2410-rtc", .data = (void *)&s3c2410_rtc_data, }, { .compatible = "samsung,s3c2416-rtc", .data = (void *)&s3c2416_rtc_data, }, { .compatible = "samsung,s3c2443-rtc", .data = (void *)&s3c2443_rtc_data, }, { .compatible = "samsung,s3c6410-rtc", .data = (void *)&s3c6410_rtc_data, }, { .compatible = "samsung,exynos3250-rtc", .data = (void *)&exynos3250_rtc_data, }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(of, s3c_rtc_dt_match); static struct platform_driver s3c_rtc_driver = { .probe = s3c_rtc_probe, .remove = s3c_rtc_remove, .driver = { .name = "s3c-rtc", .pm = &s3c_rtc_pm_ops, .of_match_table = of_match_ptr(s3c_rtc_dt_match), }, }; module_platform_driver(s3c_rtc_driver); MODULE_DESCRIPTION("Samsung S3C RTC Driver"); MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:s3c2410-rtc");
