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Allwinner drivers additions for 3.18
Nothing major, just handling the RTC driver changes needed for the A31/A23. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAABAgAGBQJUHeMwAAoJEBx+YmzsjxAg9SkQAKDnwNzCaE7X4xWaWFSwsQWG 57W79GuFBCQ5s4JLrEtzcR+z8BoiXTwc24fV9iJT9Ax8FJL+aDduLXc6wvWhyJhZ PhT7noZewWrBQxaHWlFhT4rS/jhM4FLaFayXqogS5N/ZJD/youanxfk9b1oR+OOs SG0DBpMf3n48YPQJIroE/zY4uKuMCHYpWNadyGulEtLw7Zpp3zLWGyxjLO5tZLUk al3WkcASDp2ad+vDm02X8VKhtr1EG0TbaZPw3HXDa5rW3BR2LBABcDE9U69YCn/4 CtFpBbQ7h4oWId5/OdmbJaPdO9cVyiV8ClddG6IsGp9gC+bHZKPRz74E72B/eN3Q e5wT8j2p/JE8mqEK9IUdosIDOc26I/7RQMgg3nqzlTQciwa1VUfS3IqHhdkSzuYk pwEQFD0DAs0se01E4oyGH3zgcJtj978qsUz55ke1CBEGz6zz9sTfFAjH4M2NYYFl CxlkHwP5l+yeoFVBjeHivlbrKYtN9x6VSwy3L7EPonr++xkNTuc5thQVt3ldkfkr 0lh64cuAujs0rKETr/QrY03TaqS23srycPO6oBdrwIXuI6EqHuzjSrR+sfLzpDbe iFkaiHQWCm9esQO6vEz7lsLUauGLuwPhWsmRXRGDbxQLjuMhutEIU3/9QGFr7KCj FFF7ndKUF8dcpJkWozKP =kOAE -----END PGP SIGNATURE----- Merge tag 'sunxi-drivers-for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux into next/drivers Pull "Allwinner drivers additions for 3.18" from Maxime Ripard: Nothing major, just handling the RTC driver changes needed for the A31/A23. Signed-off-by: Arnd Bergmann <arnd@arndb.de> * tag 'sunxi-drivers-for-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux: rtc: sunxi: Depend on platforms sun4i/sun7i that actually have the rtc rtc: sun6i: Add sun6i RTC driver
This commit is contained in:
Arnd Bergmann
commit
8a87f1a6c8
17
Documentation/devicetree/bindings/rtc/sun6i-rtc.txt
Normal file
17
Documentation/devicetree/bindings/rtc/sun6i-rtc.txt
Normal file
@ -0,0 +1,17 @@
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* sun6i Real Time Clock
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RTC controller for the Allwinner A31
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Required properties:
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- compatible : Should be "allwinner,sun6i-a31-rtc"
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- reg : physical base address of the controller and length of
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memory mapped region.
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- interrupts : IRQ lines for the RTC alarm 0 and alarm 1, in that order.
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Example:
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rtc: rtc@01f00000 {
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compatible = "allwinner,sun6i-a31-rtc";
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reg = <0x01f00000 0x54>;
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interrupts = <0 40 4>, <0 41 4>;
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};
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@ -1175,9 +1175,16 @@ config RTC_DRV_SUN4V
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If you say Y here you will get support for the Hypervisor
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based RTC on SUN4V systems.
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config RTC_DRV_SUN6I
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tristate "Allwinner A31 RTC"
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depends on MACH_SUN6I || MACH_SUN8I
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help
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If you say Y here you will get support for the RTC found on
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Allwinner A31.
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config RTC_DRV_SUNXI
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tristate "Allwinner sun4i/sun7i RTC"
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depends on ARCH_SUNXI
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depends on MACH_SUN4I || MACH_SUN7I
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help
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If you say Y here you will get support for the RTC found on
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Allwinner A10/A20.
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@ -128,6 +128,7 @@ obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
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obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
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obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
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obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
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obj-$(CONFIG_RTC_DRV_SUN6I) += rtc-sun6i.o
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obj-$(CONFIG_RTC_DRV_SUNXI) += rtc-sunxi.o
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obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o
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obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
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447
drivers/rtc/rtc-sun6i.c
Normal file
447
drivers/rtc/rtc-sun6i.c
Normal file
@ -0,0 +1,447 @@
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/*
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* An RTC driver for Allwinner A31/A23
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*
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* Copyright (c) 2014, Chen-Yu Tsai <wens@csie.org>
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*
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* based on rtc-sunxi.c
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*
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* An RTC driver for Allwinner A10/A20
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*
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* Copyright (c) 2013, Carlo Caione <carlo.caione@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*/
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/rtc.h>
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#include <linux/types.h>
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/* Control register */
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#define SUN6I_LOSC_CTRL 0x0000
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#define SUN6I_LOSC_CTRL_ALM_DHMS_ACC BIT(9)
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#define SUN6I_LOSC_CTRL_RTC_HMS_ACC BIT(8)
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#define SUN6I_LOSC_CTRL_RTC_YMD_ACC BIT(7)
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#define SUN6I_LOSC_CTRL_ACC_MASK GENMASK(9, 7)
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/* RTC */
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#define SUN6I_RTC_YMD 0x0010
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#define SUN6I_RTC_HMS 0x0014
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/* Alarm 0 (counter) */
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#define SUN6I_ALRM_COUNTER 0x0020
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#define SUN6I_ALRM_CUR_VAL 0x0024
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#define SUN6I_ALRM_EN 0x0028
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#define SUN6I_ALRM_EN_CNT_EN BIT(0)
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#define SUN6I_ALRM_IRQ_EN 0x002c
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#define SUN6I_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0)
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#define SUN6I_ALRM_IRQ_STA 0x0030
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#define SUN6I_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0)
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/* Alarm 1 (wall clock) */
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#define SUN6I_ALRM1_EN 0x0044
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#define SUN6I_ALRM1_IRQ_EN 0x0048
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#define SUN6I_ALRM1_IRQ_STA 0x004c
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#define SUN6I_ALRM1_IRQ_STA_WEEK_IRQ_PEND BIT(0)
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/* Alarm config */
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#define SUN6I_ALARM_CONFIG 0x0050
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#define SUN6I_ALARM_CONFIG_WAKEUP BIT(0)
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/*
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* Get date values
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*/
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#define SUN6I_DATE_GET_DAY_VALUE(x) ((x) & 0x0000001f)
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#define SUN6I_DATE_GET_MON_VALUE(x) (((x) & 0x00000f00) >> 8)
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#define SUN6I_DATE_GET_YEAR_VALUE(x) (((x) & 0x003f0000) >> 16)
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#define SUN6I_LEAP_GET_VALUE(x) (((x) & 0x00400000) >> 22)
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/*
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* Get time values
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*/
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#define SUN6I_TIME_GET_SEC_VALUE(x) ((x) & 0x0000003f)
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#define SUN6I_TIME_GET_MIN_VALUE(x) (((x) & 0x00003f00) >> 8)
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#define SUN6I_TIME_GET_HOUR_VALUE(x) (((x) & 0x001f0000) >> 16)
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/*
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* Set date values
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*/
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#define SUN6I_DATE_SET_DAY_VALUE(x) ((x) & 0x0000001f)
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#define SUN6I_DATE_SET_MON_VALUE(x) ((x) << 8 & 0x00000f00)
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#define SUN6I_DATE_SET_YEAR_VALUE(x) ((x) << 16 & 0x003f0000)
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#define SUN6I_LEAP_SET_VALUE(x) ((x) << 22 & 0x00400000)
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/*
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* Set time values
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*/
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#define SUN6I_TIME_SET_SEC_VALUE(x) ((x) & 0x0000003f)
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#define SUN6I_TIME_SET_MIN_VALUE(x) ((x) << 8 & 0x00003f00)
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#define SUN6I_TIME_SET_HOUR_VALUE(x) ((x) << 16 & 0x001f0000)
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/*
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* The year parameter passed to the driver is usually an offset relative to
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* the year 1900. This macro is used to convert this offset to another one
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* relative to the minimum year allowed by the hardware.
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*
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* The year range is 1970 - 2033. This range is selected to match Allwinner's
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* driver, even though it is somewhat limited.
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*/
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#define SUN6I_YEAR_MIN 1970
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#define SUN6I_YEAR_MAX 2033
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#define SUN6I_YEAR_OFF (SUN6I_YEAR_MIN - 1900)
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struct sun6i_rtc_dev {
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struct rtc_device *rtc;
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struct device *dev;
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void __iomem *base;
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int irq;
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unsigned long alarm;
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};
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static irqreturn_t sun6i_rtc_alarmirq(int irq, void *id)
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{
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struct sun6i_rtc_dev *chip = (struct sun6i_rtc_dev *) id;
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u32 val;
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val = readl(chip->base + SUN6I_ALRM_IRQ_STA);
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if (val & SUN6I_ALRM_IRQ_STA_CNT_IRQ_PEND) {
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val |= SUN6I_ALRM_IRQ_STA_CNT_IRQ_PEND;
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writel(val, chip->base + SUN6I_ALRM_IRQ_STA);
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rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF);
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return IRQ_HANDLED;
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}
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return IRQ_NONE;
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}
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static void sun6i_rtc_setaie(int to, struct sun6i_rtc_dev *chip)
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{
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u32 alrm_val = 0;
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u32 alrm_irq_val = 0;
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u32 alrm_wake_val = 0;
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if (to) {
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alrm_val = SUN6I_ALRM_EN_CNT_EN;
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alrm_irq_val = SUN6I_ALRM_IRQ_EN_CNT_IRQ_EN;
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alrm_wake_val = SUN6I_ALARM_CONFIG_WAKEUP;
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} else {
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writel(SUN6I_ALRM_IRQ_STA_CNT_IRQ_PEND,
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chip->base + SUN6I_ALRM_IRQ_STA);
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}
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writel(alrm_val, chip->base + SUN6I_ALRM_EN);
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writel(alrm_irq_val, chip->base + SUN6I_ALRM_IRQ_EN);
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writel(alrm_wake_val, chip->base + SUN6I_ALARM_CONFIG);
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}
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static int sun6i_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
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u32 date, time;
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/*
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* read again in case it changes
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*/
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do {
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date = readl(chip->base + SUN6I_RTC_YMD);
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time = readl(chip->base + SUN6I_RTC_HMS);
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} while ((date != readl(chip->base + SUN6I_RTC_YMD)) ||
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(time != readl(chip->base + SUN6I_RTC_HMS)));
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rtc_tm->tm_sec = SUN6I_TIME_GET_SEC_VALUE(time);
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rtc_tm->tm_min = SUN6I_TIME_GET_MIN_VALUE(time);
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rtc_tm->tm_hour = SUN6I_TIME_GET_HOUR_VALUE(time);
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rtc_tm->tm_mday = SUN6I_DATE_GET_DAY_VALUE(date);
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rtc_tm->tm_mon = SUN6I_DATE_GET_MON_VALUE(date);
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rtc_tm->tm_year = SUN6I_DATE_GET_YEAR_VALUE(date);
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rtc_tm->tm_mon -= 1;
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/*
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* switch from (data_year->min)-relative offset to
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* a (1900)-relative one
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*/
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rtc_tm->tm_year += SUN6I_YEAR_OFF;
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return rtc_valid_tm(rtc_tm);
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}
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static int sun6i_rtc_getalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
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u32 alrm_st;
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u32 alrm_en;
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alrm_en = readl(chip->base + SUN6I_ALRM_IRQ_EN);
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alrm_st = readl(chip->base + SUN6I_ALRM_IRQ_STA);
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wkalrm->enabled = !!(alrm_en & SUN6I_ALRM_EN_CNT_EN);
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wkalrm->pending = !!(alrm_st & SUN6I_ALRM_EN_CNT_EN);
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rtc_time_to_tm(chip->alarm, &wkalrm->time);
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return 0;
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}
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static int sun6i_rtc_setalarm(struct device *dev, struct rtc_wkalrm *wkalrm)
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{
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struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
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struct rtc_time *alrm_tm = &wkalrm->time;
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struct rtc_time tm_now;
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unsigned long time_now = 0;
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unsigned long time_set = 0;
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unsigned long time_gap = 0;
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int ret = 0;
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ret = sun6i_rtc_gettime(dev, &tm_now);
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if (ret < 0) {
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dev_err(dev, "Error in getting time\n");
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return -EINVAL;
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}
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rtc_tm_to_time(alrm_tm, &time_set);
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rtc_tm_to_time(&tm_now, &time_now);
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if (time_set <= time_now) {
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dev_err(dev, "Date to set in the past\n");
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return -EINVAL;
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}
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time_gap = time_set - time_now;
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if (time_gap > U32_MAX) {
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dev_err(dev, "Date too far in the future\n");
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return -EINVAL;
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}
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sun6i_rtc_setaie(0, chip);
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writel(0, chip->base + SUN6I_ALRM_COUNTER);
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usleep_range(100, 300);
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writel(time_gap, chip->base + SUN6I_ALRM_COUNTER);
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chip->alarm = time_set;
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sun6i_rtc_setaie(wkalrm->enabled, chip);
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return 0;
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}
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static int sun6i_rtc_wait(struct sun6i_rtc_dev *chip, int offset,
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unsigned int mask, unsigned int ms_timeout)
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{
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const unsigned long timeout = jiffies + msecs_to_jiffies(ms_timeout);
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u32 reg;
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do {
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reg = readl(chip->base + offset);
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reg &= mask;
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if (!reg)
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return 0;
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} while (time_before(jiffies, timeout));
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return -ETIMEDOUT;
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}
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static int sun6i_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
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{
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struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
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u32 date = 0;
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u32 time = 0;
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int year;
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year = rtc_tm->tm_year + 1900;
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if (year < SUN6I_YEAR_MIN || year > SUN6I_YEAR_MAX) {
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dev_err(dev, "rtc only supports year in range %d - %d\n",
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SUN6I_YEAR_MIN, SUN6I_YEAR_MAX);
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return -EINVAL;
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}
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rtc_tm->tm_year -= SUN6I_YEAR_OFF;
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rtc_tm->tm_mon += 1;
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date = SUN6I_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) |
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SUN6I_DATE_SET_MON_VALUE(rtc_tm->tm_mon) |
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SUN6I_DATE_SET_YEAR_VALUE(rtc_tm->tm_year);
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if (is_leap_year(year))
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date |= SUN6I_LEAP_SET_VALUE(1);
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time = SUN6I_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) |
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SUN6I_TIME_SET_MIN_VALUE(rtc_tm->tm_min) |
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SUN6I_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour);
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/* Check whether registers are writable */
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if (sun6i_rtc_wait(chip, SUN6I_LOSC_CTRL,
|
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SUN6I_LOSC_CTRL_ACC_MASK, 50)) {
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dev_err(dev, "rtc is still busy.\n");
|
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return -EBUSY;
|
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}
|
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|
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writel(time, chip->base + SUN6I_RTC_HMS);
|
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|
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/*
|
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* After writing the RTC HH-MM-SS register, the
|
||||
* SUN6I_LOSC_CTRL_RTC_HMS_ACC bit is set and it will not
|
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* be cleared until the real writing operation is finished
|
||||
*/
|
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|
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if (sun6i_rtc_wait(chip, SUN6I_LOSC_CTRL,
|
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SUN6I_LOSC_CTRL_RTC_HMS_ACC, 50)) {
|
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dev_err(dev, "Failed to set rtc time.\n");
|
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return -ETIMEDOUT;
|
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}
|
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|
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writel(date, chip->base + SUN6I_RTC_YMD);
|
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|
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/*
|
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* After writing the RTC YY-MM-DD register, the
|
||||
* SUN6I_LOSC_CTRL_RTC_YMD_ACC bit is set and it will not
|
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* be cleared until the real writing operation is finished
|
||||
*/
|
||||
|
||||
if (sun6i_rtc_wait(chip, SUN6I_LOSC_CTRL,
|
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SUN6I_LOSC_CTRL_RTC_YMD_ACC, 50)) {
|
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dev_err(dev, "Failed to set rtc time.\n");
|
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return -ETIMEDOUT;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sun6i_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
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{
|
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struct sun6i_rtc_dev *chip = dev_get_drvdata(dev);
|
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|
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if (!enabled)
|
||||
sun6i_rtc_setaie(enabled, chip);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct rtc_class_ops sun6i_rtc_ops = {
|
||||
.read_time = sun6i_rtc_gettime,
|
||||
.set_time = sun6i_rtc_settime,
|
||||
.read_alarm = sun6i_rtc_getalarm,
|
||||
.set_alarm = sun6i_rtc_setalarm,
|
||||
.alarm_irq_enable = sun6i_rtc_alarm_irq_enable
|
||||
};
|
||||
|
||||
static int sun6i_rtc_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct sun6i_rtc_dev *chip;
|
||||
struct resource *res;
|
||||
int ret;
|
||||
|
||||
chip = devm_kzalloc(&pdev->dev, sizeof(*chip), GFP_KERNEL);
|
||||
if (!chip)
|
||||
return -ENOMEM;
|
||||
|
||||
platform_set_drvdata(pdev, chip);
|
||||
chip->dev = &pdev->dev;
|
||||
|
||||
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
||||
chip->base = devm_ioremap_resource(&pdev->dev, res);
|
||||
if (IS_ERR(chip->base))
|
||||
return PTR_ERR(chip->base);
|
||||
|
||||
chip->irq = platform_get_irq(pdev, 0);
|
||||
if (chip->irq < 0) {
|
||||
dev_err(&pdev->dev, "No IRQ resource\n");
|
||||
return chip->irq;
|
||||
}
|
||||
|
||||
ret = devm_request_irq(&pdev->dev, chip->irq, sun6i_rtc_alarmirq,
|
||||
0, dev_name(&pdev->dev), chip);
|
||||
if (ret) {
|
||||
dev_err(&pdev->dev, "Could not request IRQ\n");
|
||||
return ret;
|
||||
}
|
||||
|
||||
/* clear the alarm counter value */
|
||||
writel(0, chip->base + SUN6I_ALRM_COUNTER);
|
||||
|
||||
/* disable counter alarm */
|
||||
writel(0, chip->base + SUN6I_ALRM_EN);
|
||||
|
||||
/* disable counter alarm interrupt */
|
||||
writel(0, chip->base + SUN6I_ALRM_IRQ_EN);
|
||||
|
||||
/* disable week alarm */
|
||||
writel(0, chip->base + SUN6I_ALRM1_EN);
|
||||
|
||||
/* disable week alarm interrupt */
|
||||
writel(0, chip->base + SUN6I_ALRM1_IRQ_EN);
|
||||
|
||||
/* clear counter alarm pending interrupts */
|
||||
writel(SUN6I_ALRM_IRQ_STA_CNT_IRQ_PEND,
|
||||
chip->base + SUN6I_ALRM_IRQ_STA);
|
||||
|
||||
/* clear week alarm pending interrupts */
|
||||
writel(SUN6I_ALRM1_IRQ_STA_WEEK_IRQ_PEND,
|
||||
chip->base + SUN6I_ALRM1_IRQ_STA);
|
||||
|
||||
/* disable alarm wakeup */
|
||||
writel(0, chip->base + SUN6I_ALARM_CONFIG);
|
||||
|
||||
chip->rtc = rtc_device_register("rtc-sun6i", &pdev->dev,
|
||||
&sun6i_rtc_ops, THIS_MODULE);
|
||||
if (IS_ERR(chip->rtc)) {
|
||||
dev_err(&pdev->dev, "unable to register device\n");
|
||||
return PTR_ERR(chip->rtc);
|
||||
}
|
||||
|
||||
dev_info(&pdev->dev, "RTC enabled\n");
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int sun6i_rtc_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct sun6i_rtc_dev *chip = platform_get_drvdata(pdev);
|
||||
|
||||
rtc_device_unregister(chip->rtc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct of_device_id sun6i_rtc_dt_ids[] = {
|
||||
{ .compatible = "allwinner,sun6i-a31-rtc" },
|
||||
{ /* sentinel */ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, sun6i_rtc_dt_ids);
|
||||
|
||||
static struct platform_driver sun6i_rtc_driver = {
|
||||
.probe = sun6i_rtc_probe,
|
||||
.remove = sun6i_rtc_remove,
|
||||
.driver = {
|
||||
.name = "sun6i-rtc",
|
||||
.of_match_table = sun6i_rtc_dt_ids,
|
||||
},
|
||||
};
|
||||
|
||||
module_platform_driver(sun6i_rtc_driver);
|
||||
|
||||
MODULE_DESCRIPTION("sun6i RTC driver");
|
||||
MODULE_AUTHOR("Chen-Yu Tsai <wens@csie.org>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Loading…
Reference in New Issue
Block a user