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[PATCH] MIPS: Add RTC support for loongson1B

To: a.zummo@towertech.it, rtc-linux@googlegroups.com, linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
Subject: [PATCH] MIPS: Add RTC support for loongson1B
From: zhzhl555@gmail.com
Date: Thu, 1 Dec 2011 16:44:38 +0800
Cc: ralf@linux-mips.org, keguang.zhang@gmail.com, wuzhangjin@gmail.com, r0bertz@gentoo.org, zhao zhang <zhzhl555@gmail.com>
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Sender: linux-mips-bounce@linux-mips.org
From: zhao zhang <zhzhl555@gmail.com>

V2: use new module_platform_driver macro.
thanks for Wolfram's advice.

This patch adds RTC support(TOY counter0) for loongson1B.
Signed-off-by: zhao zhang <zhzhl555@gmail.com>
---
 drivers/rtc/Kconfig    |   10 ++
 drivers/rtc/Makefile   |    1 +
 drivers/rtc/rtc-ls1x.c |  214 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 225 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..79db272
--- /dev/null
+++ b/drivers/rtc/rtc-ls1x.c
@@ -0,0 +1,214 @@
+/*
+ * Copyright (c) 2011 Zhao Zhang <zhzhl555@gmail.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, c;
+       int ret = -ETIMEDOUT;
+
+       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);
+
+       writel(v, SYS_TOYWRITE0);
+       __asm__ volatile ("sync");
+       c = 0x10000;
+       /* add timeout check counter, for more safe */
+       while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
+               usleep_range(1000, 3000);
+
+       if (!c) {
+               dev_err(dev, "set time timeout!\n");
+               goto err;
+       }
+
+       t = rtm->tm_year + 1900;
+       writel(t, SYS_TOYWRITE1);
+       __asm__ volatile ("sync");
+       c = 0x10000;
+       while ((readl(SYS_COUNTER_CNTRL) & SYS_CNTRL_TS) && --c)
+               usleep_range(1000, 3000);
+
+       if (!c) {
+               dev_err(dev, "set time timeout!\n");
+               goto err;
+       }
+       return 0;
+err:
+       return ret;
+}
+
+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),
+       .probe          = ls1x_rtc_probe,
+};
+
+module_platform_driver(ls1x_rtc_driver);
+
+MODULE_AUTHOR("zhao zhang <zhzhl555@gmail.com>");
+MODULE_LICENSE("GPL");
+
-- 
1.7.0.4


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