2 files changed, 44 insertions, 10 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index ecdff2002476..daf08fe980d0 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -406,10 +406,13 @@ config RTC_DRV_M48T86
           will be called rtc-m48t86.
 
 config RTC_DRV_M48T59
-        tristate "ST M48T59"
+        tristate "ST M48T59/M48T08/M48T02"
         help
           If you say Y here you will get support for the
-          ST M48T59 RTC chip.
+          ST M48T59 RTC chip and compatible ST M48T08 and M48T02.
+
+          These chips are usually found in Sun SPARC and UltraSPARC
+          workstations.
 
           This driver can also be built as a module, if so, the module
           will be called "rtc-m48t59".
diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index e085ab2c3dbe..50f9f10b32f0 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -24,8 +24,9 @@
 #define NO_IRQ  (-1)
 #endif
 
-#define M48T59_READ(reg)        pdata->read_byte(dev, reg)
-#define M48T59_WRITE(val, reg)  pdata->write_byte(dev, reg, val)
+#define M48T59_READ(reg) (pdata->read_byte(dev, pdata->offset + reg))
+#define M48T59_WRITE(val, reg) \
+        (pdata->write_byte(dev, pdata->offset + reg, val))
 
 #define M48T59_SET_BITS(mask, reg)      \
         M48T59_WRITE((M48T59_READ(reg) | (mask)), (reg))
@@ -309,6 +310,11 @@ static const struct rtc_class_ops m48t59_rtc_ops = {
         .proc           = m48t59_rtc_proc,
 };
 
+static const struct rtc_class_ops m48t02_rtc_ops = {
+        .read_time      = m48t59_rtc_read_time,
+        .set_time       = m48t59_rtc_set_time,
+};
+
 static ssize_t m48t59_nvram_read(struct kobject *kobj,
                                 struct bin_attribute *bin_attr,
                                 char *buf, loff_t pos, size_t size)
@@ -320,7 +326,7 @@ static ssize_t m48t59_nvram_read(struct kobject *kobj,
         ssize_t cnt = 0;
         unsigned long flags;
 
-        for (; size > 0 && pos < M48T59_NVRAM_SIZE; cnt++, size--) {
+        for (; size > 0 && pos < pdata->offset; cnt++, size--) {
                 spin_lock_irqsave(&m48t59->lock, flags);
                 *buf++ = M48T59_READ(cnt);
                 spin_unlock_irqrestore(&m48t59->lock, flags);
@@ -340,7 +346,7 @@ static ssize_t m48t59_nvram_write(struct kobject *kobj,
         ssize_t cnt = 0;
         unsigned long flags;
 
-        for (; size > 0 && pos < M48T59_NVRAM_SIZE; cnt++, size--) {
+        for (; size > 0 && pos < pdata->offset; cnt++, size--) {
                 spin_lock_irqsave(&m48t59->lock, flags);
                 M48T59_WRITE(*buf++, cnt);
                 spin_unlock_irqrestore(&m48t59->lock, flags);
@@ -357,7 +363,6 @@ static struct bin_attribute m48t59_nvram_attr = {
         },
         .read = m48t59_nvram_read,
         .write = m48t59_nvram_write,
-        .size = M48T59_NVRAM_SIZE,
 };
 
 static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
@@ -366,6 +371,8 @@ static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
         struct m48t59_private *m48t59 = NULL;
         struct resource *res;
         int ret = -ENOMEM;
+        char *name;
+        const struct rtc_class_ops *ops;
 
         /* This chip could be memory-mapped or I/O-mapped */
         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -390,6 +397,8 @@ static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
                         /* Ensure we only kmalloc platform data once */
                         pdev->dev.platform_data = pdata;
                 }
+                if (!pdata->type)
+                        pdata->type = M48T59RTC_TYPE_M48T59;
 
                 /* Try to use the generic memory read/write ops */
                 if (!pdata->write_byte)
@@ -419,14 +428,36 @@ static int __devinit m48t59_rtc_probe(struct platform_device *pdev)
                 if (ret)
                         goto out;
         }
+        switch (pdata->type) {
+        case M48T59RTC_TYPE_M48T59:
+                name = "m48t59";
+                ops = &m48t59_rtc_ops;
+                pdata->offset = 0x1ff0;
+                break;
+        case M48T59RTC_TYPE_M48T02:
+                name = "m48t02";
+                ops = &m48t02_rtc_ops;
+                pdata->offset = 0x7f0;
+                break;
+        case M48T59RTC_TYPE_M48T08:
+                name = "m48t08";
+                ops = &m48t02_rtc_ops;
+                pdata->offset = 0x1ff0;
+                break;
+        default:
+                dev_err(&pdev->dev, "Unknown RTC type\n");
+                ret = -ENODEV;
+                goto out;
+        }
 
-        m48t59->rtc = rtc_device_register("m48t59", &pdev->dev,
-                                &m48t59_rtc_ops, THIS_MODULE);
+        m48t59->rtc = rtc_device_register(name, &pdev->dev, ops, THIS_MODULE);
         if (IS_ERR(m48t59->rtc)) {
                 ret = PTR_ERR(m48t59->rtc);
                 goto out;
         }
 
+        m48t59_nvram_attr.size = pdata->offset;
+
         ret = sysfs_create_bin_file(&pdev->dev.kobj, &m48t59_nvram_attr);
         if (ret)
                 goto out;
@@ -489,5 +520,5 @@ module_init(m48t59_rtc_init);
 module_exit(m48t59_rtc_exit);
 
 MODULE_AUTHOR("Mark Zhan <rongkai.zhan@windriver.com>");
-MODULE_DESCRIPTION("M48T59 RTC driver");
+MODULE_DESCRIPTION("M48T59/M48T02/M48T08 RTC driver");
 MODULE_LICENSE("GPL");