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-rw-r--r--target/linux/sunxi/patches-3.12/175-sunxi-rtc.patch542
1 files changed, 542 insertions, 0 deletions
diff --git a/target/linux/sunxi/patches-3.12/175-sunxi-rtc.patch b/target/linux/sunxi/patches-3.12/175-sunxi-rtc.patch
new file mode 100644
index 0000000000..615658aeef
--- /dev/null
+++ b/target/linux/sunxi/patches-3.12/175-sunxi-rtc.patch
@@ -0,0 +1,542 @@
+From 9b6e3291426efc69d1e8bf257721997f3eeb3009 Mon Sep 17 00:00:00 2001
+From: Carlo Caione <carlo.caione@gmail.com>
+Date: Wed, 16 Oct 2013 20:30:27 +0200
+Subject: [PATCH] ARM: sun4i/sun7i: RTC driver
+
+This patch introduces the driver for the RTC in the Allwinner A10 and
+A20 SoCs.
+
+Signed-off-by: Carlo Caione <carlo.caione@gmail.com>
+---
+ drivers/rtc/Kconfig | 7 +
+ drivers/rtc/Makefile | 1 +
+ drivers/rtc/rtc-sunxi.c | 487 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 495 insertions(+)
+ create mode 100644 drivers/rtc/rtc-sunxi.c
+
+diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
+index 9654aa3..ef45e0b 100644
+--- a/drivers/rtc/Kconfig
++++ b/drivers/rtc/Kconfig
+@@ -1076,6 +1076,13 @@ config RTC_DRV_SUN4V
+ If you say Y here you will get support for the Hypervisor
+ based RTC on SUN4V systems.
+
++config RTC_DRV_SUNXI
++ tristate "Allwinner sun4i/sun7i RTC"
++ depends on ARCH_SUNXI
++ help
++ If you say Y here you will get support for the RTC found on
++ Allwinner A10/A20.
++
+ config RTC_DRV_STARFIRE
+ bool "Starfire RTC"
+ depends on SPARC64
+diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
+index 2dff3d2..8b52b5a 100644
+--- a/drivers/rtc/Makefile
++++ b/drivers/rtc/Makefile
+@@ -115,6 +115,7 @@ obj-$(CONFIG_RTC_DRV_STARFIRE) += rtc-starfire.o
+ obj-$(CONFIG_RTC_DRV_STK17TA8) += rtc-stk17ta8.o
+ obj-$(CONFIG_RTC_DRV_STMP) += rtc-stmp3xxx.o
+ obj-$(CONFIG_RTC_DRV_SUN4V) += rtc-sun4v.o
++obj-$(CONFIG_RTC_DRV_SUNXI) += rtc-sunxi.o
+ obj-$(CONFIG_RTC_DRV_TEGRA) += rtc-tegra.o
+ obj-$(CONFIG_RTC_DRV_TEST) += rtc-test.o
+ obj-$(CONFIG_RTC_DRV_TILE) += rtc-tile.o
+diff --git a/drivers/rtc/rtc-sunxi.c b/drivers/rtc/rtc-sunxi.c
+new file mode 100644
+index 0000000..ccd48ae
+--- /dev/null
++++ b/drivers/rtc/rtc-sunxi.c
+@@ -0,0 +1,487 @@
++/*
++ * An RTC driver for Allwinner A10/A20
++ *
++ * Copyright (c) 2013, Carlo Caione <carlo.caione@gmail.com>
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License as published by
++ * the Free Software Foundation; either version 2 of the License, or
++ * (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful, but WITHOUT
++ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
++ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
++ * more details.
++ *
++ * You should have received a copy of the GNU General Public License along
++ * with this program; if not, write to the Free Software Foundation, Inc.,
++ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
++ */
++
++#include <linux/delay.h>
++#include <linux/err.h>
++#include <linux/fs.h>
++#include <linux/init.h>
++#include <linux/interrupt.h>
++#include <linux/io.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_address.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/rtc.h>
++#include <linux/types.h>
++
++#define SUNXI_LOSC_CTRL 0x0000
++#define SUNXI_LOSC_CTRL_RTC_HMS_ACC BIT(8)
++#define SUNXI_LOSC_CTRL_RTC_YMD_ACC BIT(7)
++
++#define SUNXI_RTC_YMD 0x0004
++
++#define SUNXI_RTC_HMS 0x0008
++
++#define SUNXI_ALRM_DHMS 0x000c
++
++#define SUNXI_ALRM_EN 0x0014
++#define SUNXI_ALRM_EN_CNT_EN BIT(8)
++
++#define SUNXI_ALRM_IRQ_EN 0x0018
++#define SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN BIT(0)
++
++#define SUNXI_ALRM_IRQ_STA 0x001c
++#define SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND BIT(0)
++
++#define SUNXI_LOSC_CTRL_RTC_ACC \
++ (SUNXI_LOSC_CTRL_RTC_HMS_ACC | SUNXI_LOSC_CTRL_RTC_YMD_ACC)
++
++#define SUNXI_MASK_DH 0x0000001f
++#define SUNXI_MASK_SM 0x0000003f
++#define SUNXI_MASK_M 0x0000000f
++#define SUNXI_MASK_LY 0x00000001
++#define SUNXI_MASK_D 0x00000ffe
++#define SUNXI_MASK_M 0x0000000f
++
++#define SUNXI_GET(x, mask, shift) (((x) & ((mask) << (shift))) \
++ >> (shift))
++
++#define SUNXI_SET(x, mask, shift) (((x) & (mask)) << (shift))
++
++/* Get date values */
++#define SUNXI_DATE_GET_DAY_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 0)
++#define SUNXI_DATE_GET_MON_VALUE(x) SUNXI_GET(x, SUNXI_MASK_M, 8)
++#define SUNXI_DATE_GET_YEAR_VALUE(x, mask) SUNXI_GET(x, mask, 16)
++
++/* Get time values */
++#define SUNXI_TIME_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
++#define SUNXI_TIME_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
++#define SUNXI_TIME_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
++
++/* Get alarm values */
++#define SUNXI_ALRM_GET_SEC_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 0)
++#define SUNXI_ALRM_GET_MIN_VALUE(x) SUNXI_GET(x, SUNXI_MASK_SM, 8)
++#define SUNXI_ALRM_GET_HOUR_VALUE(x) SUNXI_GET(x, SUNXI_MASK_DH, 16)
++
++/* Set date values */
++#define SUNXI_DATE_SET_DAY_VALUE(x) SUNXI_DATE_GET_DAY_VALUE(x)
++#define SUNXI_DATE_SET_MON_VALUE(x) SUNXI_SET(x, SUNXI_MASK_M, 8)
++#define SUNXI_DATE_SET_YEAR_VALUE(x, mask) SUNXI_SET(x, mask, 16)
++#define SUNXI_LEAP_SET_VALUE(x, shift) SUNXI_SET(x, SUNXI_MASK_LY, shift)
++
++/* Set time values */
++#define SUNXI_TIME_SET_SEC_VALUE(x) SUNXI_TIME_GET_SEC_VALUE(x)
++#define SUNXI_TIME_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
++#define SUNXI_TIME_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
++
++/* set alarm values */
++#define SUNXI_ALRM_SET_SEC_VALUE(x) SUNXI_ALRM_GET_SEC_VALUE(x)
++#define SUNXI_ALRM_SET_MIN_VALUE(x) SUNXI_SET(x, SUNXI_MASK_SM, 8)
++#define SUNXI_ALRM_SET_HOUR_VALUE(x) SUNXI_SET(x, SUNXI_MASK_DH, 16)
++#define SUNXI_ALRM_SET_DAY_VALUE(x) SUNXI_SET(x, SUNXI_MASK_D, 21)
++
++/* time unit conversions */
++#define SEC_IN_MIN 60
++#define SEC_IN_HOUR (60 * SEC_IN_MIN)
++#define SEC_IN_DAY (24 * SEC_IN_HOUR)
++
++struct sunxi_rtc_data_year {
++ unsigned int min; /* min year allowed */
++ unsigned int max; /* max year allowed */
++ unsigned int off; /* data year offset */
++ unsigned int mask;
++ unsigned char leap_shift; /* bit shift to get the leap year */
++};
++
++static struct sunxi_rtc_data_year data_year_param[] = {
++ [0] = {
++ .min = 1970,
++ .max = 2100,
++ .off = 0,
++ .mask = 0x000000ff,
++ .leap_shift = 24,
++ },
++ [1] = {
++ .min = 2010,
++ .max = 2073,
++ .off = 110,
++ .mask = 0x0000003f,
++ .leap_shift = 22,
++ },
++};
++
++struct sunxi_rtc_dev {
++ struct rtc_device *rtc;
++ struct device *dev;
++ struct sunxi_rtc_data_year *data_year;
++ void __iomem *base;
++ int irq;
++};
++
++static irqreturn_t sunxi_rtc_alarmirq(int irq, void *id)
++{
++ struct sunxi_rtc_dev *chip = (struct sunxi_rtc_dev *) id;
++ u32 val;
++
++ val = readl(chip->base + SUNXI_ALRM_IRQ_STA);
++
++ if (val & SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND) {
++ val |= SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND;
++ writel(val, chip->base + SUNXI_ALRM_IRQ_STA);
++
++ rtc_update_irq(chip->rtc, 1, RTC_AF | RTC_IRQF);
++
++ return IRQ_HANDLED;
++ }
++
++ return IRQ_NONE;
++}
++
++static void sunxi_rtc_setaie(int to, struct sunxi_rtc_dev *chip)
++{
++ u32 alarm_val = 0;
++ u32 alarm_irq_val = 0;
++
++ if (to) {
++ alarm_val = readl(chip->base + SUNXI_ALRM_EN);
++ alarm_val |= SUNXI_ALRM_EN_CNT_EN;
++
++ alarm_irq_val = readl(chip->base + SUNXI_ALRM_IRQ_EN);
++ alarm_irq_val |= SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN;
++ } else {
++ writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND,
++ chip->base + SUNXI_ALRM_IRQ_STA);
++ }
++
++ writel(alarm_val, chip->base + SUNXI_ALRM_EN);
++ writel(alarm_irq_val, chip->base + SUNXI_ALRM_IRQ_EN);
++}
++
++static int sunxi_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
++{
++ struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
++ struct rtc_time *alrm_tm = &alrm->time;
++ u32 alarm;
++ u32 alarm_en;
++ u32 date;
++
++ alarm = readl(chip->base + SUNXI_ALRM_DHMS);
++ date = readl(chip->base + SUNXI_RTC_YMD);
++
++ alrm_tm->tm_sec = SUNXI_ALRM_GET_SEC_VALUE(alarm);
++ alrm_tm->tm_min = SUNXI_ALRM_GET_MIN_VALUE(alarm);
++ alrm_tm->tm_hour = SUNXI_ALRM_GET_HOUR_VALUE(alarm);
++
++ alrm_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
++ alrm_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
++ alrm_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date,
++ chip->data_year->mask);
++
++ alrm_tm->tm_year += chip->data_year->off;
++ alrm_tm->tm_mon -= 1;
++
++ alarm_en = readl(chip->base + SUNXI_ALRM_IRQ_EN);
++ if (alarm_en & SUNXI_ALRM_EN_CNT_EN)
++ alrm->enabled = 1;
++
++ return 0;
++}
++
++static int sunxi_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
++{
++ struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
++ u32 date, time;
++ int t;
++
++ /* read again if the system was mid-updated
++ */
++ for (t = 0; t < 2; t++) {
++ date = readl(chip->base + SUNXI_RTC_YMD);
++ time = readl(chip->base + SUNXI_RTC_HMS);
++
++ rtc_tm->tm_sec = SUNXI_TIME_GET_SEC_VALUE(time);
++ rtc_tm->tm_min = SUNXI_TIME_GET_MIN_VALUE(time);
++ rtc_tm->tm_hour = SUNXI_TIME_GET_HOUR_VALUE(time);
++
++ rtc_tm->tm_mday = SUNXI_DATE_GET_DAY_VALUE(date);
++ rtc_tm->tm_mon = SUNXI_DATE_GET_MON_VALUE(date);
++ rtc_tm->tm_year = SUNXI_DATE_GET_YEAR_VALUE(date,
++ chip->data_year->mask);
++
++ if (rtc_tm->tm_sec == 0)
++ msleep(500);
++ else
++ break;
++ }
++
++ rtc_tm->tm_year += chip->data_year->off;
++ rtc_tm->tm_mon -= 1;
++
++ return rtc_valid_tm(rtc_tm);
++}
++
++static int sunxi_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
++{
++ struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
++ struct rtc_time *alrm_tm = &alrm->time;
++ struct rtc_time tm_now;
++ u32 alarm = 0;
++ unsigned long time_now = 0;
++ unsigned long time_set = 0;
++ unsigned long time_gap = 0;
++ unsigned long time_gap_day = 0;
++ unsigned long time_gap_hour = 0;
++ unsigned long time_gap_min = 0;
++ int ret = 0;
++
++ ret = sunxi_rtc_gettime(dev, &tm_now);
++ if (ret < 0) {
++ dev_err(dev, "Error in getting time\n");
++ return -EINVAL;
++ }
++
++ rtc_tm_to_time(alrm_tm, &time_set);
++ rtc_tm_to_time(&tm_now, &time_now);
++ if (time_set <= time_now) {
++ dev_err(dev, "Date to set in the past\n");
++ return -EINVAL;
++ }
++
++ time_gap = time_set - time_now;
++ time_gap_day = time_gap / SEC_IN_DAY;
++ time_gap -= time_gap_day * SEC_IN_DAY;
++ time_gap_hour = time_gap / SEC_IN_HOUR;
++ time_gap -= time_gap_hour * SEC_IN_HOUR;
++ time_gap_min = time_gap / SEC_IN_MIN;
++ time_gap -= time_gap_min * SEC_IN_MIN;
++
++ if (time_gap_day > 255) {
++ dev_err(dev, "Day must be in the range 0 - 255\n");
++ return -EINVAL;
++ }
++
++ sunxi_rtc_setaie(0, chip);
++ writel(0, chip->base + SUNXI_ALRM_DHMS);
++ usleep_range(100, 300);
++
++ alarm = SUNXI_ALRM_SET_SEC_VALUE(time_gap) |
++ SUNXI_ALRM_SET_MIN_VALUE(time_gap_min) |
++ SUNXI_ALRM_SET_HOUR_VALUE(time_gap_hour) |
++ SUNXI_ALRM_SET_DAY_VALUE(time_gap_day);
++ writel(alarm, chip->base + SUNXI_ALRM_DHMS);
++
++ writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
++ writel(SUNXI_ALRM_IRQ_EN_CNT_IRQ_EN, chip->base + SUNXI_ALRM_IRQ_EN);
++
++ sunxi_rtc_setaie(alrm->enabled, chip);
++
++ return 0;
++}
++
++static int sunxi_rtc_settime(struct device *dev, struct rtc_time *rtc_tm)
++{
++ struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
++ u32 date = 0;
++ u32 time = 0;
++ int year;
++ int t;
++
++ year = rtc_tm->tm_year + 1900;
++ if (year < chip->data_year->min || year > chip->data_year->max) {
++ dev_err(dev, "rtc only supports year in range %d - %d\n",
++ chip->data_year->min, chip->data_year->max);
++ return -EINVAL;
++ }
++
++ rtc_tm->tm_year -= chip->data_year->off;
++ rtc_tm->tm_mon += 1;
++
++ date = SUNXI_DATE_SET_DAY_VALUE(rtc_tm->tm_mday) |
++ SUNXI_DATE_SET_MON_VALUE(rtc_tm->tm_mon) |
++ SUNXI_DATE_SET_YEAR_VALUE(rtc_tm->tm_year,
++ chip->data_year->mask);
++
++ if (is_leap_year(year))
++ date |= SUNXI_LEAP_SET_VALUE(1, chip->data_year->leap_shift);
++
++ time = SUNXI_TIME_SET_SEC_VALUE(rtc_tm->tm_sec) |
++ SUNXI_TIME_SET_MIN_VALUE(rtc_tm->tm_min) |
++ SUNXI_TIME_SET_HOUR_VALUE(rtc_tm->tm_hour);
++
++ writel(0, chip->base + SUNXI_RTC_HMS);
++ writel(0, chip->base + SUNXI_RTC_YMD);
++
++ writel(time, chip->base + SUNXI_RTC_HMS);
++
++ /* After writing the RCT HH-MM-SS register, the
++ * SUNXI_LOSC_CTRL_RTC_HMS_ACC bit is set and it will be cleared until
++ * the real writing operation is finished
++ */
++ for (t = 0; t < 3; t++) {
++ if ((readl(chip->base + SUNXI_LOSC_CTRL) &
++ SUNXI_LOSC_CTRL_RTC_HMS_ACC) && --t)
++ break;
++ else
++ msleep(50);
++ }
++ if (t == 0) {
++ dev_err(dev, "Failed to set rtc time.\n");
++ return -1;
++ }
++
++ writel(date, chip->base + SUNXI_RTC_YMD);
++
++ /* After writing the RCT YY-MM-DD register, the
++ * SUNXI_LOSC_CTRL_RTC_YMD_ACC bit is set and it will be cleared until
++ * the real writing operation is finished
++ */
++ for (t = 0; t < 3; t++) {
++ if ((readl(chip->base + SUNXI_LOSC_CTRL) &
++ SUNXI_LOSC_CTRL_RTC_YMD_ACC) && --t)
++ break;
++ else
++ msleep(50);
++ }
++ if (t == 0) {
++ dev_err(dev, "Failed to set rtc date.\n");
++ return -1;
++ }
++
++ /* wait about 70us to make sure the the time is really written into
++ * target */
++ usleep_range(70, 100);
++
++ return 0;
++}
++
++static int sunxi_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
++{
++ struct sunxi_rtc_dev *chip = dev_get_drvdata(dev);
++
++ if (!enabled)
++ sunxi_rtc_setaie(enabled, chip);
++
++ return 0;
++}
++
++static const struct rtc_class_ops sunxi_rtc_ops = {
++ .read_time = sunxi_rtc_gettime,
++ .set_time = sunxi_rtc_settime,
++ .read_alarm = sunxi_rtc_getalarm,
++ .set_alarm = sunxi_rtc_setalarm,
++ .alarm_irq_enable = sunxi_rtc_alarm_irq_enable
++};
++
++static const struct of_device_id sunxi_rtc_dt_ids[] = {
++ { .compatible = "allwinner,sun4i-rtc", .data = &data_year_param[0] },
++ { .compatible = "allwinner,sun7i-a20-rtc", .data = &data_year_param[1] },
++ { /* sentinel */ },
++};
++MODULE_DEVICE_TABLE(of, sunxi_rtc_dt_ids);
++
++
++static int sunxi_rtc_probe(struct platform_device *pdev)
++{
++ struct sunxi_rtc_dev *chip;
++ struct resource *res;
++ const struct of_device_id *of_id;
++ 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, sunxi_rtc_alarmirq,
++ 0, dev_name(&pdev->dev), chip);
++ if (ret) {
++ dev_err(&pdev->dev, "Could not request IRQ\n");
++ return ret;
++ }
++
++ of_id = of_match_device(sunxi_rtc_dt_ids, &pdev->dev);
++ if (!of_id) {
++ dev_err(&pdev->dev, "Unable to setup RTC data\n");
++ return -ENODEV;
++ }
++ chip->data_year = (struct sunxi_rtc_data_year *) of_id->data;
++
++ /* clear the alarm count value */
++ writel(0, chip->base + SUNXI_ALRM_DHMS);
++
++ /* disable alarm, not generate irq pending */
++ writel(0, chip->base + SUNXI_ALRM_EN);
++
++ /* disable alarm week/cnt irq, unset to cpu */
++ writel(0, chip->base + SUNXI_ALRM_IRQ_EN);
++
++ /* clear alarm week/cnt irq pending */
++ writel(SUNXI_ALRM_IRQ_STA_CNT_IRQ_PEND, chip->base + SUNXI_ALRM_IRQ_STA);
++
++ chip->rtc = rtc_device_register("rtc-sunxi", &pdev->dev,
++ &sunxi_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 sunxi_rtc_remove(struct platform_device *pdev)
++{
++ struct sunxi_rtc_dev *chip = platform_get_drvdata(pdev);
++
++ rtc_device_unregister(chip->rtc);
++
++ return 0;
++}
++
++static struct platform_driver sunxi_rtc_driver = {
++ .probe = sunxi_rtc_probe,
++ .remove = sunxi_rtc_remove,
++ .driver = {
++ .name = "sunxi-rtc",
++ .owner = THIS_MODULE,
++ .of_match_table = sunxi_rtc_dt_ids,
++ },
++};
++
++module_platform_driver(sunxi_rtc_driver);
++
++MODULE_DESCRIPTION("sunxi RTC driver");
++MODULE_AUTHOR("Carlo Caione <carlo.caione@gmail.com>");
++MODULE_LICENSE("GPL");
+--
+1.8.4
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-16 06:43:38 +0000