From 2f58f5eea8c60052100ff325688f2d987bde572b Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Wed, 20 Jan 2021 16:41:58 +0100 Subject: rtc: remove ste ab3100 driver The ST-Ericsson U300 platform is getting removed, so this driver is no longer needed. Cc: Linus Walleij Signed-off-by: Arnd Bergmann Reviewed-by: Linus Walleij Signed-off-by: Alexandre Belloni Link: https://lore.kernel.org/r/20210120154158.1860736-4-arnd@kernel.org --- drivers/rtc/rtc-ab3100.c | 254 ----------------------------------------------- 1 file changed, 254 deletions(-) delete mode 100644 drivers/rtc/rtc-ab3100.c (limited to 'drivers/rtc/rtc-ab3100.c') diff --git a/drivers/rtc/rtc-ab3100.c b/drivers/rtc/rtc-ab3100.c deleted file mode 100644 index e4fd961e8bf6..000000000000 --- a/drivers/rtc/rtc-ab3100.c +++ /dev/null @@ -1,254 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * Copyright (C) 2007-2009 ST-Ericsson AB - * RTC clock driver for the AB3100 Analog Baseband Chip - * Author: Linus Walleij - */ -#include -#include -#include -#include -#include -#include - -/* Clock rate in Hz */ -#define AB3100_RTC_CLOCK_RATE 32768 - -/* - * The AB3100 RTC registers. These are the same for - * AB3000 and AB3100. - * Control register: - * Bit 0: RTC Monitor cleared=0, active=1, if you set it - * to 1 it remains active until RTC power is lost. - * Bit 1: 32 kHz Oscillator, 0 = on, 1 = bypass - * Bit 2: Alarm on, 0 = off, 1 = on - * Bit 3: 32 kHz buffer disabling, 0 = enabled, 1 = disabled - */ -#define AB3100_RTC 0x53 -/* default setting, buffer disabled, alarm on */ -#define RTC_SETTING 0x30 -/* Alarm when AL0-AL3 == TI0-TI3 */ -#define AB3100_AL0 0x56 -#define AB3100_AL1 0x57 -#define AB3100_AL2 0x58 -#define AB3100_AL3 0x59 -/* This 48-bit register that counts up at 32768 Hz */ -#define AB3100_TI0 0x5a -#define AB3100_TI1 0x5b -#define AB3100_TI2 0x5c -#define AB3100_TI3 0x5d -#define AB3100_TI4 0x5e -#define AB3100_TI5 0x5f - -/* - * RTC clock functions and device struct declaration - */ -static int ab3100_rtc_set_time(struct device *dev, struct rtc_time *tm) -{ - u8 regs[] = {AB3100_TI0, AB3100_TI1, AB3100_TI2, - AB3100_TI3, AB3100_TI4, AB3100_TI5}; - unsigned char buf[6]; - u64 hw_counter = rtc_tm_to_time64(tm) * AB3100_RTC_CLOCK_RATE * 2; - int err = 0; - int i; - - buf[0] = (hw_counter) & 0xFF; - buf[1] = (hw_counter >> 8) & 0xFF; - buf[2] = (hw_counter >> 16) & 0xFF; - buf[3] = (hw_counter >> 24) & 0xFF; - buf[4] = (hw_counter >> 32) & 0xFF; - buf[5] = (hw_counter >> 40) & 0xFF; - - for (i = 0; i < 6; i++) { - err = abx500_set_register_interruptible(dev, 0, - regs[i], buf[i]); - if (err) - return err; - } - - /* Set the flag to mark that the clock is now set */ - return abx500_mask_and_set_register_interruptible(dev, 0, - AB3100_RTC, - 0x01, 0x01); - -} - -static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm) -{ - time64_t time; - u8 rtcval; - int err; - - err = abx500_get_register_interruptible(dev, 0, - AB3100_RTC, &rtcval); - if (err) - return err; - - if (!(rtcval & 0x01)) { - dev_info(dev, "clock not set (lost power)"); - return -EINVAL; - } else { - u64 hw_counter; - u8 buf[6]; - - /* Read out time registers */ - err = abx500_get_register_page_interruptible(dev, 0, - AB3100_TI0, - buf, 6); - if (err != 0) - return err; - - hw_counter = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) | - ((u64) buf[3] << 24) | ((u64) buf[2] << 16) | - ((u64) buf[1] << 8) | (u64) buf[0]; - time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2); - } - - rtc_time64_to_tm(time, tm); - - return 0; -} - -static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) -{ - time64_t time; - u64 hw_counter; - u8 buf[6]; - u8 rtcval; - int err; - - /* Figure out if alarm is enabled or not */ - err = abx500_get_register_interruptible(dev, 0, - AB3100_RTC, &rtcval); - if (err) - return err; - if (rtcval & 0x04) - alarm->enabled = 1; - else - alarm->enabled = 0; - /* No idea how this could be represented */ - alarm->pending = 0; - /* Read out alarm registers, only 4 bytes */ - err = abx500_get_register_page_interruptible(dev, 0, - AB3100_AL0, buf, 4); - if (err) - return err; - hw_counter = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) | - ((u64) buf[1] << 24) | ((u64) buf[0] << 16); - time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2); - - rtc_time64_to_tm(time, &alarm->time); - - return rtc_valid_tm(&alarm->time); -} - -static int ab3100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) -{ - u8 regs[] = {AB3100_AL0, AB3100_AL1, AB3100_AL2, AB3100_AL3}; - unsigned char buf[4]; - time64_t secs; - u64 hw_counter; - int err; - int i; - - secs = rtc_tm_to_time64(&alarm->time); - hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2; - buf[0] = (hw_counter >> 16) & 0xFF; - buf[1] = (hw_counter >> 24) & 0xFF; - buf[2] = (hw_counter >> 32) & 0xFF; - buf[3] = (hw_counter >> 40) & 0xFF; - - /* Set the alarm */ - for (i = 0; i < 4; i++) { - err = abx500_set_register_interruptible(dev, 0, - regs[i], buf[i]); - if (err) - return err; - } - /* Then enable the alarm */ - return abx500_mask_and_set_register_interruptible(dev, 0, - AB3100_RTC, (1 << 2), - alarm->enabled << 2); -} - -static int ab3100_rtc_irq_enable(struct device *dev, unsigned int enabled) -{ - /* - * It's not possible to enable/disable the alarm IRQ for this RTC. - * It does not actually trigger any IRQ: instead its only function is - * to power up the system, if it wasn't on. This will manifest as - * a "power up cause" in the AB3100 power driver (battery charging etc) - * and need to be handled there instead. - */ - if (enabled) - return abx500_mask_and_set_register_interruptible(dev, 0, - AB3100_RTC, (1 << 2), - 1 << 2); - else - return abx500_mask_and_set_register_interruptible(dev, 0, - AB3100_RTC, (1 << 2), - 0); -} - -static const struct rtc_class_ops ab3100_rtc_ops = { - .read_time = ab3100_rtc_read_time, - .set_time = ab3100_rtc_set_time, - .read_alarm = ab3100_rtc_read_alarm, - .set_alarm = ab3100_rtc_set_alarm, - .alarm_irq_enable = ab3100_rtc_irq_enable, -}; - -static int __init ab3100_rtc_probe(struct platform_device *pdev) -{ - int err; - u8 regval; - struct rtc_device *rtc; - - /* The first RTC register needs special treatment */ - err = abx500_get_register_interruptible(&pdev->dev, 0, - AB3100_RTC, ®val); - if (err) { - dev_err(&pdev->dev, "unable to read RTC register\n"); - return -ENODEV; - } - - if ((regval & 0xFE) != RTC_SETTING) { - dev_warn(&pdev->dev, "not default value in RTC reg 0x%x\n", - regval); - } - - if ((regval & 1) == 0) { - /* - * Set bit to detect power loss. - * This bit remains until RTC power is lost. - */ - regval = 1 | RTC_SETTING; - err = abx500_set_register_interruptible(&pdev->dev, 0, - AB3100_RTC, regval); - /* Ignore any error on this write */ - } - - rtc = devm_rtc_allocate_device(&pdev->dev); - if (IS_ERR(rtc)) - return PTR_ERR(rtc); - - rtc->ops = &ab3100_rtc_ops; - /* 48bit counter at (AB3100_RTC_CLOCK_RATE * 2) */ - rtc->range_max = U32_MAX; - - platform_set_drvdata(pdev, rtc); - - return devm_rtc_register_device(rtc); -} - -static struct platform_driver ab3100_rtc_driver = { - .driver = { - .name = "ab3100-rtc", - }, -}; - -module_platform_driver_probe(ab3100_rtc_driver, ab3100_rtc_probe); - -MODULE_AUTHOR("Linus Walleij "); -MODULE_DESCRIPTION("AB3100 RTC Driver"); -MODULE_LICENSE("GPL"); -- cgit