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Message-Id: <1322189527-4761-1-git-send-email-zhzhl555@gmail.com>
Date: Fri, 25 Nov 2011 10:52:07 +0800
From: zhzhl555@...il.com
To: a.zummo@...ertech.it, rtc-linux@...glegroups.com,
linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Cc: ralf@...ux-mips.org, keguang.zhang@...il.com, wuzhangjin@...il.com,
r0bertz@...too.org, zhao zhang <zhzhl555@...il.com>
Subject: [PATCH V1] MIPS: Add RTC support for loongson1B
From: zhao zhang <zhzhl555@...il.com>
V1: replace __raw_writel/__raw_readl with writel/readl.
thanks for Linus Wallei's advice.
This patch adds RTC support(TOY counter0) for loongson1B.
Signed-off-by: zhao zhang <zhzhl555@...il.com>
---
drivers/rtc/Kconfig | 10 ++
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-ls1x.c | 213 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 224 insertions(+), 0 deletions(-)
create mode 100644 drivers/rtc/rtc-ls1x.c
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 5a538fc..6f8c2d7 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1070,4 +1070,14 @@ config RTC_DRV_PUV3
This drive can also be built as a module. If so, the module
will be called rtc-puv3.
+config RTC_DRV_LOONGSON1
+ tristate "loongson1 RTC support"
+ depends on MACH_LOONGSON1
+ help
+ This is a driver for the loongson1 on-chip Counter0 (Time-Of-Year
+ counter) to be used as a RTC.
+
+ This driver can also be built as a module. If so, the module
+ will be called rtc-ls1x.
+
endif # RTC_CLASS
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 6e69823..48153fe 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -109,3 +109,4 @@ obj-$(CONFIG_RTC_DRV_VT8500) += rtc-vt8500.o
obj-$(CONFIG_RTC_DRV_WM831X) += rtc-wm831x.o
obj-$(CONFIG_RTC_DRV_WM8350) += rtc-wm8350.o
obj-$(CONFIG_RTC_DRV_X1205) += rtc-x1205.o
+obj-$(CONFIG_RTC_DRV_LOONGSON1) += rtc-ls1x.o
diff --git a/drivers/rtc/rtc-ls1x.c b/drivers/rtc/rtc-ls1x.c
new file mode 100644
index 0000000..c752a30
--- /dev/null
+++ b/drivers/rtc/rtc-ls1x.c
@@ -0,0 +1,213 @@
+/*
+ * Copyright (c) 2011 Zhao Zhang <zhzhl555@...il.com>
+ *
+ * Derived from driver/rtc/rtc-au1xxx.c
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/rtc.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/types.h>
+#include <linux/io.h>
+#include <asm/mach-loongson1/loongson1.h>
+
+#define LS1X_RTC_REG_OFFSET (LS1X_RTC_BASE + 0x20)
+#define LS1X_RTC_REGS(x) \
+ ((void __iomem *)KSEG1ADDR(LS1X_RTC_REG_OFFSET + (x)))
+
+/*RTC programmable counters 0 and 1*/
+#define SYS_COUNTER_CNTRL (LS1X_RTC_REGS(0x20))
+#define SYS_CNTRL_ERS (1 << 23)
+#define SYS_CNTRL_RTS (1 << 20)
+#define SYS_CNTRL_RM2 (1 << 19)
+#define SYS_CNTRL_RM1 (1 << 18)
+#define SYS_CNTRL_RM0 (1 << 17)
+#define SYS_CNTRL_RS (1 << 16)
+#define SYS_CNTRL_BP (1 << 14)
+#define SYS_CNTRL_REN (1 << 13)
+#define SYS_CNTRL_BRT (1 << 12)
+#define SYS_CNTRL_TEN (1 << 11)
+#define SYS_CNTRL_BTT (1 << 10)
+#define SYS_CNTRL_E0 (1 << 8)
+#define SYS_CNTRL_ETS (1 << 7)
+#define SYS_CNTRL_32S (1 << 5)
+#define SYS_CNTRL_TTS (1 << 4)
+#define SYS_CNTRL_TM2 (1 << 3)
+#define SYS_CNTRL_TM1 (1 << 2)
+#define SYS_CNTRL_TM0 (1 << 1)
+#define SYS_CNTRL_TS (1 << 0)
+
+/* Programmable Counter 0 Registers */
+#define SYS_TOYTRIM (LS1X_RTC_REGS(0))
+#define SYS_TOYWRITE0 (LS1X_RTC_REGS(4))
+#define SYS_TOYWRITE1 (LS1X_RTC_REGS(8))
+#define SYS_TOYREAD0 (LS1X_RTC_REGS(0xC))
+#define SYS_TOYREAD1 (LS1X_RTC_REGS(0x10))
+#define SYS_TOYMATCH0 (LS1X_RTC_REGS(0x14))
+#define SYS_TOYMATCH1 (LS1X_RTC_REGS(0x18))
+#define SYS_TOYMATCH2 (LS1X_RTC_REGS(0x1C))
+
+/* Programmable Counter 1 Registers */
+#define SYS_RTCTRIM (LS1X_RTC_REGS(0x40))
+#define SYS_RTCWRITE0 (LS1X_RTC_REGS(0x44))
+#define SYS_RTCREAD0 (LS1X_RTC_REGS(0x48))
+#define SYS_RTCMATCH0 (LS1X_RTC_REGS(0x4C))
+#define SYS_RTCMATCH1 (LS1X_RTC_REGS(0x50))
+#define SYS_RTCMATCH2 (LS1X_RTC_REGS(0x54))
+
+#define LS1X_SEC_OFFSET (4)
+#define LS1X_MIN_OFFSET (10)
+#define LS1X_HOUR_OFFSET (16)
+#define LS1X_DAY_OFFSET (21)
+#define LS1X_MONTH_OFFSET (26)
+
+
+#define LS1X_SEC_MASK (0x3f)
+#define LS1X_MIN_MASK (0x3f)
+#define LS1X_HOUR_MASK (0x1f)
+#define LS1X_DAY_MASK (0x1f)
+#define LS1X_MONTH_MASK (0x3f)
+#define LS1X_YEAR_MASK (0xffffffff)
+
+#define ls1x_get_sec(t) (((t) >> LS1X_SEC_OFFSET) & LS1X_SEC_MASK)
+#define ls1x_get_min(t) (((t) >> LS1X_MIN_OFFSET) & LS1X_MIN_MASK)
+#define ls1x_get_hour(t) (((t) >> LS1X_HOUR_OFFSET) & LS1X_HOUR_MASK)
+#define ls1x_get_day(t) (((t) >> LS1X_DAY_OFFSET) & LS1X_DAY_MASK)
+#define ls1x_get_month(t) (((t) >> LS1X_MONTH_OFFSET) & LS1X_MONTH_MASK)
+
+#define RTC_CNTR_OK (SYS_CNTRL_E0 | SYS_CNTRL_32S)
+
+static int ls1x_rtc_read_time(struct device *dev, struct rtc_time *rtm)
+{
+ unsigned long v, t;
+
+ v = readl(SYS_TOYREAD0);
+ t = readl(SYS_TOYREAD1);
+
+ memset(rtm, 0, sizeof(struct rtc_time));
+ t = mktime((t & LS1X_YEAR_MASK), ls1x_get_month(v),
+ ls1x_get_day(v), ls1x_get_hour(v),
+ ls1x_get_min(v), ls1x_get_sec(v));
+ rtc_time_to_tm(t, rtm);
+
+ return rtc_valid_tm(rtm);
+}
+
+static int ls1x_rtc_set_time(struct device *dev, struct rtc_time *rtm)
+{
+ unsigned long v, t;
+
+ v = ((rtm->tm_mon + 1) << LS1X_MONTH_OFFSET)
+ | (rtm->tm_mday << LS1X_DAY_OFFSET)
+ | (rtm->tm_hour << LS1X_HOUR_OFFSET)
+ | (rtm->tm_min << LS1X_MIN_OFFSET)
+ | (rtm->tm_sec << LS1X_SEC_OFFSET);
+
+ t = rtm->tm_year + 1900;
+ writel(v, SYS_TOYWRITE0);
+ while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS)
+ usleep_range(1000, 3000);
+ __asm__ volatile ("sync");
+
+ writel(t, SYS_TOYWRITE1);
+ while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS)
+ usleep_range(1000, 3000);
+ __asm__ volatile ("sync");
+
+ v = readl(SYS_COUNTER_CNTRL);
+ return 0;
+}
+
+static struct rtc_class_ops ls1x_rtc_ops = {
+ .read_time = ls1x_rtc_read_time,
+ .set_time = ls1x_rtc_set_time,
+};
+
+static int __devinit ls1x_rtc_probe(struct platform_device *pdev)
+{
+ struct rtc_device *rtcdev;
+ unsigned long v;
+ int ret;
+
+ v = readl(SYS_COUNTER_CNTRL);
+ if (!(v & RTC_CNTR_OK)) {
+ dev_err(&pdev->dev, "rtc counters not working\n");
+ ret = -ENODEV;
+ goto err;
+ }
+ ret = -ETIMEDOUT;
+ /*set to 1 HZ if needed*/
+ if (readl(SYS_TOYTRIM) != 32767) {
+ v = 0x100000;
+ while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS) && --v)
+ usleep_range(1000, 3000);
+
+ if (!v) {
+ dev_err(&pdev->dev, "time out\n");
+ goto err;
+ }
+ writel(32767, SYS_TOYTRIM);
+ __asm__ volatile("sync");
+ }
+ /*this loop coundn't be endless*/
+ while (readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TTS)
+ usleep_range(1000, 3000);
+
+ rtcdev = rtc_device_register("ls1x-rtc", &pdev->dev,
+ &ls1x_rtc_ops , THIS_MODULE);
+ if (IS_ERR(rtcdev)) {
+ ret = PTR_ERR(rtcdev);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, rtcdev);
+ return 0;
+err:
+ return ret;
+}
+
+static int __devexit ls1x_rtc_remove(struct platform_device *pdev)
+{
+ struct rtc_device *rtcdev = platform_get_drvdata(pdev);
+
+ rtc_device_unregister(rtcdev);
+ platform_set_drvdata(pdev, NULL);
+
+ return 0;
+}
+
+static struct platform_driver ls1x_rtc_driver = {
+ .driver = {
+ .name = "ls1x-rtc",
+ .owner = THIS_MODULE,
+ },
+ .remove = __devexit_p(ls1x_rtc_remove),
+};
+
+static int __init ls1x_rtc_init(void)
+{
+ return platform_driver_probe(&ls1x_rtc_driver, ls1x_rtc_probe);
+}
+
+static void __exit ls1x_rtc_exit(void)
+{
+ platform_driver_unregister(&ls1x_rtc_driver);
+}
+
+
+module_init(ls1x_rtc_init);
+module_exit(ls1x_rtc_exit);
+
+
+MODULE_DESCRIPTION("LOONGSON1 TOY-counter-based RTC driver");
+MODULE_AUTHOR("zhao zhang <zhzhl555@...il.com>");
+MODULE_LICENSE("GPL");
+
--
1.7.0.4
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