3 files changed, 185 insertions, 27 deletions

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 09d5cd33a3f6..56002f7d26bd 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -225,11 +225,11 @@ config RTC_DRV_PCF8583
           will be called rtc-pcf8583.
 
 config RTC_DRV_M41T80
-        tristate "ST M41T65/M41T80/81/82/83/84/85/87"
+        tristate "ST M41T62/65/M41T80/81/82/83/84/85/87"
         help
           If you say Y here you will get support for the ST M41T60
           and M41T80 RTC chips series. Currently, the following chips are
-          supported: M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
+          supported: M41T62, M41T65, M41T80, M41T81, M41T82, M41T83, M41ST84,
           M41ST85, and M41ST87.
 
           This driver can also be built as a module. If so, the module
diff --git a/drivers/rtc/rtc-m41t80.c b/drivers/rtc/rtc-m41t80.c
index 893f7dece239..60fe266f0f49 100644
--- a/drivers/rtc/rtc-m41t80.c
+++ b/drivers/rtc/rtc-m41t80.c
@@ -64,10 +64,12 @@
 #define M41T80_FEATURE_BL       (1 << 1)        /* Battery low indicator */
 #define M41T80_FEATURE_SQ       (1 << 2)        /* Squarewave feature */
 #define M41T80_FEATURE_WD       (1 << 3)        /* Extra watchdog resolution */
+#define M41T80_FEATURE_SQ_ALT   (1 << 4)        /* RSx bits are in reg 4 */
 
 #define DRV_VERSION "0.05"
 
 static const struct i2c_device_id m41t80_id[] = {
+        { "m41t62", M41T80_FEATURE_SQ | M41T80_FEATURE_SQ_ALT },
         { "m41t65", M41T80_FEATURE_HT | M41T80_FEATURE_WD },
         { "m41t80", M41T80_FEATURE_SQ },
         { "m41t81", M41T80_FEATURE_HT | M41T80_FEATURE_SQ},
@@ -393,12 +395,15 @@ static ssize_t m41t80_sysfs_show_sqwfreq(struct device *dev,
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct m41t80_data *clientdata = i2c_get_clientdata(client);
-        int val;
+        int val, reg_sqw;
 
         if (!(clientdata->features & M41T80_FEATURE_SQ))
                 return -EINVAL;
 
-        val = i2c_smbus_read_byte_data(client, M41T80_REG_SQW);
+        reg_sqw = M41T80_REG_SQW;
+        if (clientdata->features & M41T80_FEATURE_SQ_ALT)
+                reg_sqw = M41T80_REG_WDAY;
+        val = i2c_smbus_read_byte_data(client, reg_sqw);
         if (val < 0)
                 return -EIO;
         val = (val >> 4) & 0xf;
@@ -419,7 +424,7 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
 {
         struct i2c_client *client = to_i2c_client(dev);
         struct m41t80_data *clientdata = i2c_get_clientdata(client);
-        int almon, sqw;
+        int almon, sqw, reg_sqw;
         int val = simple_strtoul(buf, NULL, 0);
 
         if (!(clientdata->features & M41T80_FEATURE_SQ))
@@ -440,13 +445,16 @@ static ssize_t m41t80_sysfs_set_sqwfreq(struct device *dev,
         almon = i2c_smbus_read_byte_data(client, M41T80_REG_ALARM_MON);
         if (almon < 0)
                 return -EIO;
-        sqw = i2c_smbus_read_byte_data(client, M41T80_REG_SQW);
+        reg_sqw = M41T80_REG_SQW;
+        if (clientdata->features & M41T80_FEATURE_SQ_ALT)
+                reg_sqw = M41T80_REG_WDAY;
+        sqw = i2c_smbus_read_byte_data(client, reg_sqw);
         if (sqw < 0)
                 return -EIO;
         sqw = (sqw & 0x0f) | (val << 4);
         if (i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
                                       almon & ~M41T80_ALMON_SQWE) < 0 ||
-            i2c_smbus_write_byte_data(client, M41T80_REG_SQW, sqw) < 0)
+            i2c_smbus_write_byte_data(client, reg_sqw, sqw) < 0)
                 return -EIO;
         if (val && i2c_smbus_write_byte_data(client, M41T80_REG_ALARM_MON,
                                              almon | M41T80_ALMON_SQWE) < 0)
diff --git a/drivers/rtc/rtc-v3020.c b/drivers/rtc/rtc-v3020.c
index 66955cc9c746..ad164056feb6 100644
--- a/drivers/rtc/rtc-v3020.c
+++ b/drivers/rtc/rtc-v3020.c
@@ -27,17 +27,162 @@
 #include <linux/bcd.h>
 #include <linux/rtc-v3020.h>
 #include <linux/delay.h>
+#include <linux/gpio.h>
 
 #include <linux/io.h>
 
 #undef DEBUG
 
+struct v3020;
+
+struct v3020_chip_ops {
+        int (*map_io)(struct v3020 *chip, struct platform_device *pdev,
+                      struct v3020_platform_data *pdata);
+        void (*unmap_io)(struct v3020 *chip);
+        unsigned char (*read_bit)(struct v3020 *chip);
+        void (*write_bit)(struct v3020 *chip, unsigned char bit);
+};
+
+#define V3020_CS        0
+#define V3020_WR        1
+#define V3020_RD        2
+#define V3020_IO        3
+
+struct v3020_gpio {
+        const char *name;
+        unsigned int gpio;
+};
+
 struct v3020 {
+        /* MMIO access */
         void __iomem *ioaddress;
         int leftshift;
+
+        /* GPIO access */
+        struct v3020_gpio *gpio;
+
+        struct v3020_chip_ops *ops;
+
         struct rtc_device *rtc;
 };
 
+
+static int v3020_mmio_map(struct v3020 *chip, struct platform_device *pdev,
+                          struct v3020_platform_data *pdata)
+{
+        if (pdev->num_resources != 1)
+                return -EBUSY;
+
+        if (pdev->resource[0].flags != IORESOURCE_MEM)
+                return -EBUSY;
+
+        chip->leftshift = pdata->leftshift;
+        chip->ioaddress = ioremap(pdev->resource[0].start, 1);
+        if (chip->ioaddress == NULL)
+                return -EBUSY;
+
+        return 0;
+}
+
+static void v3020_mmio_unmap(struct v3020 *chip)
+{
+        iounmap(chip->ioaddress);
+}
+
+static void v3020_mmio_write_bit(struct v3020 *chip, unsigned char bit)
+{
+        writel(bit << chip->leftshift, chip->ioaddress);
+}
+
+static unsigned char v3020_mmio_read_bit(struct v3020 *chip)
+{
+        return readl(chip->ioaddress) & (1 << chip->leftshift);
+}
+
+static struct v3020_chip_ops v3020_mmio_ops = {
+        .map_io         = v3020_mmio_map,
+        .unmap_io       = v3020_mmio_unmap,
+        .read_bit       = v3020_mmio_read_bit,
+        .write_bit      = v3020_mmio_write_bit,
+};
+
+static struct v3020_gpio v3020_gpio[] = {
+        { "RTC CS", 0 },
+        { "RTC WR", 0 },
+        { "RTC RD", 0 },
+        { "RTC IO", 0 },
+};
+
+static int v3020_gpio_map(struct v3020 *chip, struct platform_device *pdev,
+                          struct v3020_platform_data *pdata)
+{
+        int i, err;
+
+        v3020_gpio[V3020_CS].gpio = pdata->gpio_cs;
+        v3020_gpio[V3020_WR].gpio = pdata->gpio_wr;
+        v3020_gpio[V3020_RD].gpio = pdata->gpio_rd;
+        v3020_gpio[V3020_IO].gpio = pdata->gpio_io;
+
+        for (i = 0; i < ARRAY_SIZE(v3020_gpio); i++) {
+                err = gpio_request(v3020_gpio[i].gpio, v3020_gpio[i].name);
+                if (err)
+                        goto err_request;
+
+                gpio_direction_output(v3020_gpio[i].gpio, 1);
+        }
+
+        chip->gpio = v3020_gpio;
+
+        return 0;
+
+err_request:
+        while (--i >= 0)
+                gpio_free(v3020_gpio[i].gpio);
+
+        return err;
+}
+
+static void v3020_gpio_unmap(struct v3020 *chip)
+{
+        int i;
+
+        for (i = 0; i < ARRAY_SIZE(v3020_gpio); i++)
+                gpio_free(v3020_gpio[i].gpio);
+}
+
+static void v3020_gpio_write_bit(struct v3020 *chip, unsigned char bit)
+{
+        gpio_direction_output(chip->gpio[V3020_IO].gpio, bit);
+        gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
+        gpio_set_value(chip->gpio[V3020_WR].gpio, 0);
+        udelay(1);
+        gpio_set_value(chip->gpio[V3020_WR].gpio, 1);
+        gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
+}
+
+static unsigned char v3020_gpio_read_bit(struct v3020 *chip)
+{
+        int bit;
+
+        gpio_direction_input(chip->gpio[V3020_IO].gpio);
+        gpio_set_value(chip->gpio[V3020_CS].gpio, 0);
+        gpio_set_value(chip->gpio[V3020_RD].gpio, 0);
+        udelay(1);
+        bit = !!gpio_get_value(chip->gpio[V3020_IO].gpio);
+        udelay(1);
+        gpio_set_value(chip->gpio[V3020_RD].gpio, 1);
+        gpio_set_value(chip->gpio[V3020_CS].gpio, 1);
+
+        return bit;
+}
+
+static struct v3020_chip_ops v3020_gpio_ops = {
+        .map_io         = v3020_gpio_map,
+        .unmap_io       = v3020_gpio_unmap,
+        .read_bit       = v3020_gpio_read_bit,
+        .write_bit      = v3020_gpio_write_bit,
+};
+
 static void v3020_set_reg(struct v3020 *chip, unsigned char address,
                         unsigned char data)
 {
@@ -46,7 +191,7 @@ static void v3020_set_reg(struct v3020 *chip, unsigned char address,
 
         tmp = address;
         for (i = 0; i < 4; i++) {
-                writel((tmp & 1) << chip->leftshift, chip->ioaddress);
+                chip->ops->write_bit(chip, (tmp & 1));
                 tmp >>= 1;
                 udelay(1);
         }
@@ -54,7 +199,7 @@ static void v3020_set_reg(struct v3020 *chip, unsigned char address,
         /* Commands dont have data */
         if (!V3020_IS_COMMAND(address)) {
                 for (i = 0; i < 8; i++) {
-                        writel((data & 1) << chip->leftshift, chip->ioaddress);
+                        chip->ops->write_bit(chip, (data & 1));
                         data >>= 1;
                         udelay(1);
                 }
@@ -67,14 +212,14 @@ static unsigned char v3020_get_reg(struct v3020 *chip, unsigned char address)
         int i;
 
         for (i = 0; i < 4; i++) {
-                writel((address & 1) << chip->leftshift, chip->ioaddress);
+                chip->ops->write_bit(chip, (address & 1));
                 address >>= 1;
                 udelay(1);
         }
 
         for (i = 0; i < 8; i++) {
                 data >>= 1;
-                if (readl(chip->ioaddress) & (1 << chip->leftshift))
+                if (chip->ops->read_bit(chip))
                         data |= 0x80;
                 udelay(1);
         }
@@ -164,25 +309,23 @@ static int rtc_probe(struct platform_device *pdev)
         int i;
         int temp;
 
-        if (pdev->num_resources != 1)
-                return -EBUSY;
-
-        if (pdev->resource[0].flags != IORESOURCE_MEM)
-                return -EBUSY;
-
         chip = kzalloc(sizeof *chip, GFP_KERNEL);
         if (!chip)
                 return -ENOMEM;
 
-        chip->leftshift = pdata->leftshift;
-        chip->ioaddress = ioremap(pdev->resource[0].start, 1);
-        if (chip->ioaddress == NULL)
+        if (pdata->use_gpio)
+                chip->ops = &v3020_gpio_ops;
+        else
+                chip->ops = &v3020_mmio_ops;
+
+        retval = chip->ops->map_io(chip, pdev, pdata);
+        if (retval)
                 goto err_chip;
 
         /* Make sure the v3020 expects a communication cycle
          * by reading 8 times */
         for (i = 0; i < 8; i++)
-                temp = readl(chip->ioaddress);
+                temp = chip->ops->read_bit(chip);
 
         /* Test chip by doing a write/read sequence
          * to the chip ram */
@@ -196,10 +339,17 @@ static int rtc_probe(struct platform_device *pdev)
          * are all disabled */
         v3020_set_reg(chip, V3020_STATUS_0, 0x0);
 
-        dev_info(&pdev->dev, "Chip available at physical address 0x%llx,"
-                "data connected to D%d\n",
-                (unsigned long long)pdev->resource[0].start,
-                chip->leftshift);
+        if (pdata->use_gpio)
+                dev_info(&pdev->dev, "Chip available at GPIOs "
+                         "%d, %d, %d, %d\n",
+                         chip->gpio[V3020_CS].gpio, chip->gpio[V3020_WR].gpio,
+                         chip->gpio[V3020_RD].gpio, chip->gpio[V3020_IO].gpio);
+        else
+                dev_info(&pdev->dev, "Chip available at "
+                         "physical address 0x%llx,"
+                         "data connected to D%d\n",
+                         (unsigned long long)pdev->resource[0].start,
+                         chip->leftshift);
 
         platform_set_drvdata(pdev, chip);
 
@@ -214,7 +364,7 @@ static int rtc_probe(struct platform_device *pdev)
         return 0;
 
 err_io:
-        iounmap(chip->ioaddress);
+        chip->ops->unmap_io(chip);
 err_chip:
         kfree(chip);
 
@@ -229,7 +379,7 @@ static int rtc_remove(struct platform_device *dev)
         if (rtc)
                 rtc_device_unregister(rtc);
 
-        iounmap(chip->ioaddress);
+        chip->ops->unmap_io(chip);
         kfree(chip);
 
         return 0;