// SPDX-License-Identifier: GPL-2.0+ /* * (C) Copyright 2008 * Gururaja Hebbar gururajakr@sanyo.co.in * * reference linux-2.6.20.6/drivers/rtc/rtc-pl031.c */ #include #include #include #include #include #include #include /* * Register definitions */ #define RTC_DR 0x00 /* Data read register */ #define RTC_MR 0x04 /* Match register */ #define RTC_LR 0x08 /* Data load register */ #define RTC_CR 0x0c /* Control register */ #define RTC_IMSC 0x10 /* Interrupt mask and set register */ #define RTC_RIS 0x14 /* Raw interrupt status register */ #define RTC_MIS 0x18 /* Masked interrupt status register */ #define RTC_ICR 0x1c /* Interrupt clear register */ #define RTC_CR_START (1 << 0) struct pl031_platdata { phys_addr_t base; }; static inline u32 pl031_read_reg(struct udevice *dev, int reg) { struct pl031_platdata *pdata = dev_get_platdata(dev); return readl(pdata->base + reg); } static inline u32 pl031_write_reg(struct udevice *dev, int reg, u32 value) { struct pl031_platdata *pdata = dev_get_platdata(dev); return writel(value, pdata->base + reg); } /* * Probe RTC device */ static int pl031_probe(struct udevice *dev) { /* Enable RTC Start in Control register*/ pl031_write_reg(dev, RTC_CR, RTC_CR_START); return 0; } /* * Get the current time from the RTC */ static int pl031_get(struct udevice *dev, struct rtc_time *tm) { unsigned long tim; if (!tm) return -EINVAL; tim = pl031_read_reg(dev, RTC_DR); rtc_to_tm(tim, tm); debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); return 0; } /* * Set the RTC */ static int pl031_set(struct udevice *dev, const struct rtc_time *tm) { unsigned long tim; if (!tm) return -EINVAL; debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n", tm->tm_year, tm->tm_mon, tm->tm_mday, tm->tm_wday, tm->tm_hour, tm->tm_min, tm->tm_sec); /* Calculate number of seconds this incoming time represents */ tim = rtc_mktime(tm); pl031_write_reg(dev, RTC_LR, tim); return 0; } /* * Reset the RTC. We set the date back to 1970-01-01. */ static int pl031_reset(struct udevice *dev) { pl031_write_reg(dev, RTC_LR, 0); return 0; } static const struct rtc_ops pl031_ops = { .get = pl031_get, .set = pl031_set, .reset = pl031_reset, }; static const struct udevice_id pl031_ids[] = { { .compatible = "arm,pl031" }, { } }; static int pl031_ofdata_to_platdata(struct udevice *dev) { struct pl031_platdata *pdata = dev_get_platdata(dev); pdata->base = dev_read_addr(dev); return 0; } U_BOOT_DRIVER(rtc_pl031) = { .name = "rtc-pl031", .id = UCLASS_RTC, .of_match = pl031_ids, .probe = pl031_probe, .ofdata_to_platdata = pl031_ofdata_to_platdata, .platdata_auto_alloc_size = sizeof(struct pl031_platdata), .ops = &pl031_ops, };