// SPDX-License-Identifier: GPL-2.0/* * SuperH On-Chip RTC Support * * Copyright (C) 2006 - 2009 Paul Mundt * Copyright (C) 2006 Jamie Lenehan * Copyright (C) 2008 Angelo Castello * Copyright (C) 2025 Wolfram Sang, Renesas Electronics Corporation * * Based on the old arch/sh/kernel/cpu/rtc.c by: * * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka */#include <linux/module.h>#include <linux/kernel.h>#include <linux/bcd.h>#include <linux/rtc.h>#include <linux/init.h>#include <linux/platform_device.h>#include <linux/seq_file.h>#include <linux/interrupt.h>#include <linux/spinlock.h>#include <linux/io.h>#include <linux/log2.h>#include <linux/clk.h>#include <linux/slab.h>#ifdef CONFIG_SUPERH#include <asm/rtc.h>#else/* Default values for RZ/A RTC */#define rtc_reg_size sizeof(u16)#define RTC_BIT_INVERTED 0 /* no chip bugs */#define RTC_CAP_4_DIGIT_YEAR BIT(0)#define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR#endif #define DRV_NAME "sh-rtc" #define RTC_REG(r) ((r) * rtc_reg_size) #define R64CNT RTC_REG(0) #define RSECCNT RTC_REG(1) /* RTC sec */#define RMINCNT RTC_REG(2) /* RTC min */#define RHRCNT RTC_REG(3) /* RTC hour */#define RWKCNT RTC_REG(4) /* RTC week */#define RDAYCNT RTC_REG(5) /* RTC day */#define RMONCNT RTC_REG(6) /* RTC month */#define RYRCNT RTC_REG(7) /* RTC year */#define RSECAR RTC_REG(8) /* ALARM sec */#define RMINAR RTC_REG(9) /* ALARM min */#define RHRAR RTC_REG(10) /* ALARM hour */#define RWKAR RTC_REG(11) /* ALARM week */#define RDAYAR RTC_REG(12) /* ALARM day */#define RMONAR RTC_REG(13) /* ALARM month */#define RCR1 RTC_REG(14) /* Control */#define RCR2 RTC_REG(15) /* Control */ /* * Note on RYRAR and RCR3: Up until this point most of the register * definitions are consistent across all of the available parts. However, * the placement of the optional RYRAR and RCR3 (the RYRAR control * register used to control RYRCNT/RYRAR compare) varies considerably * across various parts, occasionally being mapped in to a completely * unrelated address space. For proper RYRAR support a separate resource * would have to be handed off, but as this is purely optional in * practice, we simply opt not to support it, thereby keeping the code * quite a bit more simplified. */ /* ALARM Bits - or with BCD encoded value */#define AR_ENB BIT(7) /* Enable for alarm cmp */ /* RCR1 Bits */#define RCR1_CF BIT(7) /* Carry Flag */#define RCR1_CIE BIT(4) /* Carry Interrupt Enable */#define RCR1_AIE BIT(3) /* Alarm Interrupt Enable */#define RCR1_AF BIT(0) /* Alarm Flag */ /* RCR2 Bits */#define RCR2_RTCEN BIT(3) /* ENable RTC */#define RCR2_ADJ BIT(2) /* ADJustment (30-second) */#define RCR2_RESET BIT(1) /* Reset bit */#define RCR2_START BIT(0) /* Start bit */ struct sh_rtc { void __iomem *regbase; int alarm_irq; struct clk *clk; struct rtc_device *rtc_dev; spinlock_t lock; /* protecting register access */ unsigned long capabilities; /* See asm/rtc.h for cap bits */}; static irqreturn_t sh_rtc_alarm(int irq, void *dev_id){ struct sh_rtc *rtc = dev_id; unsigned int tmp, pending; spin_lock(&rtc->lock); tmp = readb(rtc->regbase + RCR1); pending = tmp & RCR1_AF; tmp &= ~(RCR1_AF | RCR1_AIE); writeb(tmp, rtc->regbase + RCR1); if (pending) rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); spin_unlock(&rtc->lock); return IRQ_RETVAL(pending);} static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enable){ struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int tmp; spin_lock_irq(&rtc->lock); tmp = readb(rtc->regbase + RCR1); if (enable) tmp |= RCR1_AIE; else tmp &= ~RCR1_AIE; writeb(tmp, rtc->regbase + RCR1); spin_unlock_irq(&rtc->lock); return 0;} static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm){ struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int sec128, sec2, yr, yr100, cf_bit; if (!(readb(rtc->regbase + RCR2) & RCR2_RTCEN)) return -EINVAL; do { unsigned int tmp; spin_lock_irq(&rtc->lock); tmp = readb(rtc->regbase + RCR1); tmp &= ~RCR1_CF; /* Clear CF-bit */ tmp |= RCR1_CIE; writeb(tmp, rtc->regbase + RCR1); sec128 = readb(rtc->regbase + R64CNT); tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT)); tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT)); tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT)); tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT)); tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT)); tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1; if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { yr = readw(rtc->regbase + RYRCNT); yr100 = bcd2bin(yr >> 8); yr &= 0xff; } else { yr = readb(rtc->regbase + RYRCNT); yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20); } tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900; sec2 = readb(rtc->regbase + R64CNT); cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF; spin_unlock_irq(&rtc->lock); } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0); #if RTC_BIT_INVERTED != 0 if ((sec128 & RTC_BIT_INVERTED)) tm->tm_sec--;#endif dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday); return 0;} static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm){ struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int tmp; int year; spin_lock_irq(&rtc->lock); /* Reset pre-scaler & stop RTC */ tmp = readb(rtc->regbase + RCR2); tmp |= RCR2_RESET; tmp &= ~RCR2_START; writeb(tmp, rtc->regbase + RCR2); writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT); writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT); writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT); writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT); writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT); writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT); if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) | bin2bcd(tm->tm_year % 100); writew(year, rtc->regbase + RYRCNT); } else { year = tm->tm_year % 100; writeb(bin2bcd(year), rtc->regbase + RYRCNT); } /* Start RTC */ tmp = readb(rtc->regbase + RCR2); tmp &= ~RCR2_RESET; tmp |= RCR2_RTCEN | RCR2_START; writeb(tmp, rtc->regbase + RCR2); spin_unlock_irq(&rtc->lock); return 0;} static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off){ unsigned int byte; int value = -1; /* return -1 for ignored values */ byte = readb(rtc->regbase + reg_off); if (byte & AR_ENB) { byte &= ~AR_ENB; /* strip the enable bit */ value = bcd2bin(byte); } return value;} static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm){ struct sh_rtc *rtc = dev_get_drvdata(dev); struct rtc_time *tm = &wkalrm->time; spin_lock_irq(&rtc->lock); tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR); tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR); tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR); tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR); tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR); tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR); if (tm->tm_mon > 0) tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */ wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0; spin_unlock_irq(&rtc->lock); return 0;} static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc, int value, int reg_off){ /* < 0 for a value that is ignored */ if (value < 0) writeb(0, rtc->regbase + reg_off); else writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off);} static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm){ struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int rcr1; struct rtc_time *tm = &wkalrm->time; int mon; spin_lock_irq(&rtc->lock); /* disable alarm interrupt and clear the alarm flag */ rcr1 = readb(rtc->regbase + RCR1); rcr1 &= ~(RCR1_AF | RCR1_AIE); writeb(rcr1, rtc->regbase + RCR1); /* set alarm time */ sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR); sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR); sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR); sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR); sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR); mon = tm->tm_mon; if (mon >= 0) mon += 1; sh_rtc_write_alarm_value(rtc, mon, RMONAR); if (wkalrm->enabled) { rcr1 |= RCR1_AIE; writeb(rcr1, rtc->regbase + RCR1); } spin_unlock_irq(&rtc->lock); return 0;} static const struct rtc_class_ops sh_rtc_ops = { .read_time = sh_rtc_read_time, .set_time = sh_rtc_set_time, .read_alarm = sh_rtc_read_alarm, .set_alarm = sh_rtc_set_alarm, .alarm_irq_enable = sh_rtc_alarm_irq_enable,}; static int __init sh_rtc_probe(struct platform_device *pdev){ struct sh_rtc *rtc; struct resource *res, *req_res; char clk_name[14]; int clk_id, ret; unsigned int tmp; resource_size_t regsize; rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); if (unlikely(!rtc)) return -ENOMEM; spin_lock_init(&rtc->lock); ret = platform_get_irq(pdev, 0); if (unlikely(ret <= 0)) { dev_err(&pdev->dev, "No IRQ resource\n"); return -ENOENT; } if (!pdev->dev.of_node) rtc->alarm_irq = platform_get_irq(pdev, 2); else rtc->alarm_irq = ret; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!res) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "No IO resource\n"); return -ENOENT; } regsize = resource_size(res); req_res = devm_request_mem_region(&pdev->dev, res->start, regsize, pdev->name); if (!req_res) return -EBUSY; rtc->regbase = devm_ioremap(&pdev->dev, req_res->start, regsize); if (!rtc->regbase) return -EINVAL; if (!pdev->dev.of_node) { clk_id = pdev->id; /* With a single device, the clock id is still "rtc0" */ if (clk_id < 0) clk_id = 0; snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id); } else { snprintf(clk_name, sizeof(clk_name), "fck"); } rtc->clk = devm_clk_get(&pdev->dev, clk_name); if (IS_ERR(rtc->clk)) { /* * No error handling for rtc->clk intentionally, not all * platforms will have a unique clock for the RTC, and * the clk API can handle the struct clk pointer being * NULL. */ rtc->clk = NULL; } rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtc->rtc_dev)) return PTR_ERR(rtc->rtc_dev); clk_enable(rtc->clk); rtc->capabilities = RTC_DEF_CAPABILITIES; #ifdef CONFIG_SUPERH if (dev_get_platdata(&pdev->dev)) { struct sh_rtc_platform_info *pinfo = dev_get_platdata(&pdev->dev); /* * Some CPUs have special capabilities in addition to the * default set. Add those in here. */ rtc->capabilities |= pinfo->capabilities; }#endif ret = devm_request_irq(&pdev->dev, rtc->alarm_irq, sh_rtc_alarm, 0, "sh-rtc", rtc); if (ret) { dev_err(&pdev->dev, "request alarm IRQ failed with %d, IRQ %d\n", ret, rtc->alarm_irq); goto err_unmap; } platform_set_drvdata(pdev, rtc); /* everything disabled by default */ tmp = readb(rtc->regbase + RCR1); tmp &= ~(RCR1_CIE | RCR1_AIE); writeb(tmp, rtc->regbase + RCR1); rtc->rtc_dev->ops = &sh_rtc_ops; if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900; rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999; } else { rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0); rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59); } ret = devm_rtc_register_device(rtc->rtc_dev); if (ret) goto err_unmap; device_init_wakeup(&pdev->dev, true); return 0; err_unmap: clk_disable(rtc->clk); return ret;} static void __exit sh_rtc_remove(struct platform_device *pdev){ struct sh_rtc *rtc = platform_get_drvdata(pdev); sh_rtc_alarm_irq_enable(&pdev->dev, 0); clk_disable(rtc->clk);} static int sh_rtc_suspend(struct device *dev){ struct sh_rtc *rtc = dev_get_drvdata(dev); if (device_may_wakeup(dev)) irq_set_irq_wake(rtc->alarm_irq, 1); return 0;} static int sh_rtc_resume(struct device *dev){ struct sh_rtc *rtc = dev_get_drvdata(dev); if (device_may_wakeup(dev)) irq_set_irq_wake(rtc->alarm_irq, 0); return 0;} static DEFINE_SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume); static const struct of_device_id sh_rtc_of_match[] = { { .compatible = "renesas,sh-rtc", }, { /* sentinel */ }};MODULE_DEVICE_TABLE(of, sh_rtc_of_match); /* * sh_rtc_remove() lives in .exit.text. For drivers registered via * module_platform_driver_probe() this is ok because they cannot get unbound at * runtime. So mark the driver struct with __refdata to prevent modpost * triggering a section mismatch warning. */static struct platform_driver sh_rtc_platform_driver __refdata = { .driver = { .name = DRV_NAME, .pm = pm_sleep_ptr(&sh_rtc_pm_ops), .of_match_table = sh_rtc_of_match, }, .remove = __exit_p(sh_rtc_remove),}; module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe); Lines 1–500 of 506. Load more
// SPDX-License-Identifier: GPL-2.0 /* * SuperH On-Chip RTC Support * * Copyright (C) 2006 - 2009 Paul Mundt * Copyright (C) 2006 Jamie Lenehan * Copyright (C) 2008 Angelo Castello * Copyright (C) 2025 Wolfram Sang, Renesas Electronics Corporation * * Based on the old arch/sh/kernel/cpu/rtc.c by: * * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org> * Copyright (C) 1999 Tetsuya Okada & Niibe Yutaka */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/bcd.h> #include <linux/rtc.h> #include <linux/init.h> #include <linux/platform_device.h> #include <linux/seq_file.h> #include <linux/interrupt.h> #include <linux/spinlock.h> #include <linux/io.h> #include <linux/log2.h> #include <linux/clk.h> #include <linux/slab.h> #ifdef CONFIG_SUPERH #include <asm/rtc.h> #else /* Default values for RZ/A RTC */ #define rtc_reg_size sizeof(u16) #define RTC_BIT_INVERTED 0 /* no chip bugs */ #define RTC_CAP_4_DIGIT_YEAR BIT(0) #define RTC_DEF_CAPABILITIES RTC_CAP_4_DIGIT_YEAR #endif #define DRV_NAME "sh-rtc" #define RTC_REG(r) ((r) * rtc_reg_size) #define R64CNT RTC_REG(0) #define RSECCNT RTC_REG(1) /* RTC sec */ #define RMINCNT RTC_REG(2) /* RTC min */ #define RHRCNT RTC_REG(3) /* RTC hour */ #define RWKCNT RTC_REG(4) /* RTC week */ #define RDAYCNT RTC_REG(5) /* RTC day */ #define RMONCNT RTC_REG(6) /* RTC month */ #define RYRCNT RTC_REG(7) /* RTC year */ #define RSECAR RTC_REG(8) /* ALARM sec */ #define RMINAR RTC_REG(9) /* ALARM min */ #define RHRAR RTC_REG(10) /* ALARM hour */ #define RWKAR RTC_REG(11) /* ALARM week */ #define RDAYAR RTC_REG(12) /* ALARM day */ #define RMONAR RTC_REG(13) /* ALARM month */ #define RCR1 RTC_REG(14) /* Control */ #define RCR2 RTC_REG(15) /* Control */ /* * Note on RYRAR and RCR3: Up until this point most of the register * definitions are consistent across all of the available parts. However, * the placement of the optional RYRAR and RCR3 (the RYRAR control * register used to control RYRCNT/RYRAR compare) varies considerably * across various parts, occasionally being mapped in to a completely * unrelated address space. For proper RYRAR support a separate resource * would have to be handed off, but as this is purely optional in * practice, we simply opt not to support it, thereby keeping the code * quite a bit more simplified. */ /* ALARM Bits - or with BCD encoded value */ #define AR_ENB BIT(7) /* Enable for alarm cmp */ /* RCR1 Bits */ #define RCR1_CF BIT(7) /* Carry Flag */ #define RCR1_CIE BIT(4) /* Carry Interrupt Enable */ #define RCR1_AIE BIT(3) /* Alarm Interrupt Enable */ #define RCR1_AF BIT(0) /* Alarm Flag */ /* RCR2 Bits */ #define RCR2_RTCEN BIT(3) /* ENable RTC */ #define RCR2_ADJ BIT(2) /* ADJustment (30-second) */ #define RCR2_RESET BIT(1) /* Reset bit */ #define RCR2_START BIT(0) /* Start bit */ struct sh_rtc { void __iomem *regbase; int alarm_irq; struct clk *clk; struct rtc_device *rtc_dev; spinlock_t lock; /* protecting register access */ unsigned long capabilities; /* See asm/rtc.h for cap bits */ }; static irqreturn_t sh_rtc_alarm(int irq, void *dev_id) { struct sh_rtc *rtc = dev_id; unsigned int tmp, pending; spin_lock(&rtc->lock); tmp = readb(rtc->regbase + RCR1); pending = tmp & RCR1_AF; tmp &= ~(RCR1_AF | RCR1_AIE); writeb(tmp, rtc->regbase + RCR1); if (pending) rtc_update_irq(rtc->rtc_dev, 1, RTC_AF | RTC_IRQF); spin_unlock(&rtc->lock); return IRQ_RETVAL(pending); } static int sh_rtc_alarm_irq_enable(struct device *dev, unsigned int enable) { struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int tmp; spin_lock_irq(&rtc->lock); tmp = readb(rtc->regbase + RCR1); if (enable) tmp |= RCR1_AIE; else tmp &= ~RCR1_AIE; writeb(tmp, rtc->regbase + RCR1); spin_unlock_irq(&rtc->lock); return 0; } static int sh_rtc_read_time(struct device *dev, struct rtc_time *tm) { struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int sec128, sec2, yr, yr100, cf_bit; if (!(readb(rtc->regbase + RCR2) & RCR2_RTCEN)) return -EINVAL; do { unsigned int tmp; spin_lock_irq(&rtc->lock); tmp = readb(rtc->regbase + RCR1); tmp &= ~RCR1_CF; /* Clear CF-bit */ tmp |= RCR1_CIE; writeb(tmp, rtc->regbase + RCR1); sec128 = readb(rtc->regbase + R64CNT); tm->tm_sec = bcd2bin(readb(rtc->regbase + RSECCNT)); tm->tm_min = bcd2bin(readb(rtc->regbase + RMINCNT)); tm->tm_hour = bcd2bin(readb(rtc->regbase + RHRCNT)); tm->tm_wday = bcd2bin(readb(rtc->regbase + RWKCNT)); tm->tm_mday = bcd2bin(readb(rtc->regbase + RDAYCNT)); tm->tm_mon = bcd2bin(readb(rtc->regbase + RMONCNT)) - 1; if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { yr = readw(rtc->regbase + RYRCNT); yr100 = bcd2bin(yr >> 8); yr &= 0xff; } else { yr = readb(rtc->regbase + RYRCNT); yr100 = bcd2bin((yr == 0x99) ? 0x19 : 0x20); } tm->tm_year = (yr100 * 100 + bcd2bin(yr)) - 1900; sec2 = readb(rtc->regbase + R64CNT); cf_bit = readb(rtc->regbase + RCR1) & RCR1_CF; spin_unlock_irq(&rtc->lock); } while (cf_bit != 0 || ((sec128 ^ sec2) & RTC_BIT_INVERTED) != 0); #if RTC_BIT_INVERTED != 0 if ((sec128 & RTC_BIT_INVERTED)) tm->tm_sec--; #endif dev_dbg(dev, "%s: tm is secs=%d, mins=%d, hours=%d, mday=%d, mon=%d, year=%d, wday=%d\n", __func__, tm->tm_sec, tm->tm_min, tm->tm_hour, tm->tm_mday, tm->tm_mon + 1, tm->tm_year, tm->tm_wday); return 0; } static int sh_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int tmp; int year; spin_lock_irq(&rtc->lock); /* Reset pre-scaler & stop RTC */ tmp = readb(rtc->regbase + RCR2); tmp |= RCR2_RESET; tmp &= ~RCR2_START; writeb(tmp, rtc->regbase + RCR2); writeb(bin2bcd(tm->tm_sec), rtc->regbase + RSECCNT); writeb(bin2bcd(tm->tm_min), rtc->regbase + RMINCNT); writeb(bin2bcd(tm->tm_hour), rtc->regbase + RHRCNT); writeb(bin2bcd(tm->tm_wday), rtc->regbase + RWKCNT); writeb(bin2bcd(tm->tm_mday), rtc->regbase + RDAYCNT); writeb(bin2bcd(tm->tm_mon + 1), rtc->regbase + RMONCNT); if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { year = (bin2bcd((tm->tm_year + 1900) / 100) << 8) | bin2bcd(tm->tm_year % 100); writew(year, rtc->regbase + RYRCNT); } else { year = tm->tm_year % 100; writeb(bin2bcd(year), rtc->regbase + RYRCNT); } /* Start RTC */ tmp = readb(rtc->regbase + RCR2); tmp &= ~RCR2_RESET; tmp |= RCR2_RTCEN | RCR2_START; writeb(tmp, rtc->regbase + RCR2); spin_unlock_irq(&rtc->lock); return 0; } static inline int sh_rtc_read_alarm_value(struct sh_rtc *rtc, int reg_off) { unsigned int byte; int value = -1; /* return -1 for ignored values */ byte = readb(rtc->regbase + reg_off); if (byte & AR_ENB) { byte &= ~AR_ENB; /* strip the enable bit */ value = bcd2bin(byte); } return value; } static int sh_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) { struct sh_rtc *rtc = dev_get_drvdata(dev); struct rtc_time *tm = &wkalrm->time; spin_lock_irq(&rtc->lock); tm->tm_sec = sh_rtc_read_alarm_value(rtc, RSECAR); tm->tm_min = sh_rtc_read_alarm_value(rtc, RMINAR); tm->tm_hour = sh_rtc_read_alarm_value(rtc, RHRAR); tm->tm_wday = sh_rtc_read_alarm_value(rtc, RWKAR); tm->tm_mday = sh_rtc_read_alarm_value(rtc, RDAYAR); tm->tm_mon = sh_rtc_read_alarm_value(rtc, RMONAR); if (tm->tm_mon > 0) tm->tm_mon -= 1; /* RTC is 1-12, tm_mon is 0-11 */ wkalrm->enabled = (readb(rtc->regbase + RCR1) & RCR1_AIE) ? 1 : 0; spin_unlock_irq(&rtc->lock); return 0; } static inline void sh_rtc_write_alarm_value(struct sh_rtc *rtc, int value, int reg_off) { /* < 0 for a value that is ignored */ if (value < 0) writeb(0, rtc->regbase + reg_off); else writeb(bin2bcd(value) | AR_ENB, rtc->regbase + reg_off); } static int sh_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *wkalrm) { struct sh_rtc *rtc = dev_get_drvdata(dev); unsigned int rcr1; struct rtc_time *tm = &wkalrm->time; int mon; spin_lock_irq(&rtc->lock); /* disable alarm interrupt and clear the alarm flag */ rcr1 = readb(rtc->regbase + RCR1); rcr1 &= ~(RCR1_AF | RCR1_AIE); writeb(rcr1, rtc->regbase + RCR1); /* set alarm time */ sh_rtc_write_alarm_value(rtc, tm->tm_sec, RSECAR); sh_rtc_write_alarm_value(rtc, tm->tm_min, RMINAR); sh_rtc_write_alarm_value(rtc, tm->tm_hour, RHRAR); sh_rtc_write_alarm_value(rtc, tm->tm_wday, RWKAR); sh_rtc_write_alarm_value(rtc, tm->tm_mday, RDAYAR); mon = tm->tm_mon; if (mon >= 0) mon += 1; sh_rtc_write_alarm_value(rtc, mon, RMONAR); if (wkalrm->enabled) { rcr1 |= RCR1_AIE; writeb(rcr1, rtc->regbase + RCR1); } spin_unlock_irq(&rtc->lock); return 0; } static const struct rtc_class_ops sh_rtc_ops = { .read_time = sh_rtc_read_time, .set_time = sh_rtc_set_time, .read_alarm = sh_rtc_read_alarm, .set_alarm = sh_rtc_set_alarm, .alarm_irq_enable = sh_rtc_alarm_irq_enable, }; static int __init sh_rtc_probe(struct platform_device *pdev) { struct sh_rtc *rtc; struct resource *res, *req_res; char clk_name[14]; int clk_id, ret; unsigned int tmp; resource_size_t regsize; rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL); if (unlikely(!rtc)) return -ENOMEM; spin_lock_init(&rtc->lock); ret = platform_get_irq(pdev, 0); if (unlikely(ret <= 0)) { dev_err(&pdev->dev, "No IRQ resource\n"); return -ENOENT; } if (!pdev->dev.of_node) rtc->alarm_irq = platform_get_irq(pdev, 2); else rtc->alarm_irq = ret; res = platform_get_resource(pdev, IORESOURCE_IO, 0); if (!res) res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) { dev_err(&pdev->dev, "No IO resource\n"); return -ENOENT; } regsize = resource_size(res); req_res = devm_request_mem_region(&pdev->dev, res->start, regsize, pdev->name); if (!req_res) return -EBUSY; rtc->regbase = devm_ioremap(&pdev->dev, req_res->start, regsize); if (!rtc->regbase) return -EINVAL; if (!pdev->dev.of_node) { clk_id = pdev->id; /* With a single device, the clock id is still "rtc0" */ if (clk_id < 0) clk_id = 0; snprintf(clk_name, sizeof(clk_name), "rtc%d", clk_id); } else { snprintf(clk_name, sizeof(clk_name), "fck"); } rtc->clk = devm_clk_get(&pdev->dev, clk_name); if (IS_ERR(rtc->clk)) { /* * No error handling for rtc->clk intentionally, not all * platforms will have a unique clock for the RTC, and * the clk API can handle the struct clk pointer being * NULL. */ rtc->clk = NULL; } rtc->rtc_dev = devm_rtc_allocate_device(&pdev->dev); if (IS_ERR(rtc->rtc_dev)) return PTR_ERR(rtc->rtc_dev); clk_enable(rtc->clk); rtc->capabilities = RTC_DEF_CAPABILITIES; #ifdef CONFIG_SUPERH if (dev_get_platdata(&pdev->dev)) { struct sh_rtc_platform_info *pinfo = dev_get_platdata(&pdev->dev); /* * Some CPUs have special capabilities in addition to the * default set. Add those in here. */ rtc->capabilities |= pinfo->capabilities; } #endif ret = devm_request_irq(&pdev->dev, rtc->alarm_irq, sh_rtc_alarm, 0, "sh-rtc", rtc); if (ret) { dev_err(&pdev->dev, "request alarm IRQ failed with %d, IRQ %d\n", ret, rtc->alarm_irq); goto err_unmap; } platform_set_drvdata(pdev, rtc); /* everything disabled by default */ tmp = readb(rtc->regbase + RCR1); tmp &= ~(RCR1_CIE | RCR1_AIE); writeb(tmp, rtc->regbase + RCR1); rtc->rtc_dev->ops = &sh_rtc_ops; if (rtc->capabilities & RTC_CAP_4_DIGIT_YEAR) { rtc->rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_1900; rtc->rtc_dev->range_max = RTC_TIMESTAMP_END_9999; } else { rtc->rtc_dev->range_min = mktime64(1999, 1, 1, 0, 0, 0); rtc->rtc_dev->range_max = mktime64(2098, 12, 31, 23, 59, 59); } ret = devm_rtc_register_device(rtc->rtc_dev); if (ret) goto err_unmap; device_init_wakeup(&pdev->dev, true); return 0; err_unmap: clk_disable(rtc->clk); return ret; } static void __exit sh_rtc_remove(struct platform_device *pdev) { struct sh_rtc *rtc = platform_get_drvdata(pdev); sh_rtc_alarm_irq_enable(&pdev->dev, 0); clk_disable(rtc->clk); } static int sh_rtc_suspend(struct device *dev) { struct sh_rtc *rtc = dev_get_drvdata(dev); if (device_may_wakeup(dev)) irq_set_irq_wake(rtc->alarm_irq, 1); return 0; } static int sh_rtc_resume(struct device *dev) { struct sh_rtc *rtc = dev_get_drvdata(dev); if (device_may_wakeup(dev)) irq_set_irq_wake(rtc->alarm_irq, 0); return 0; } static DEFINE_SIMPLE_DEV_PM_OPS(sh_rtc_pm_ops, sh_rtc_suspend, sh_rtc_resume); static const struct of_device_id sh_rtc_of_match[] = { { .compatible = "renesas,sh-rtc", }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, sh_rtc_of_match); /* * sh_rtc_remove() lives in .exit.text. For drivers registered via * module_platform_driver_probe() this is ok because they cannot get unbound at * runtime. So mark the driver struct with __refdata to prevent modpost * triggering a section mismatch warning. */ static struct platform_driver sh_rtc_platform_driver __refdata = { .driver = { .name = DRV_NAME, .pm = pm_sleep_ptr(&sh_rtc_pm_ops), .of_match_table = sh_rtc_of_match, }, .remove = __exit_p(sh_rtc_remove), }; module_platform_driver_probe(sh_rtc_platform_driver, sh_rtc_probe);