[PATCH v2 4/7] watchdog: orion: Add Armada 375/380 SoC support

Ezequiel Garcia
2014-03-04T16:07:21Z

This commit adds support for the Armada 375 and Armada 380 SoCs.

This SoC variant has a second RSTOUT register, in addition to the already
existent, which is shared with the system-controller. To handle this RSTOUT,
we introduce a new MMIO register 'rstout_mask' to be required on
'armada-{375,380}-watchdog' new compatible string.

Signed-off-by: Ezequiel Garcia <ezequiel.garcia-wi1+55ScJUtKEb57/3fJTNBPR1lH4CV8@public.gmane.org>
---
drivers/watchdog/orion_wdt.c | 98 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 98 insertions(+)

diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index 8fb8e65..e567655 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -56,6 +56,7 @@ struct orion_watchdog_data {
int wdt_counter_offset;
int wdt_enable_bit;
int rstout_enable_bit;
+ int rstout_mask_bit;
int (*clock_init)(struct platform_device *,
struct orion_watchdog *);
int (*enabled)(struct orion_watchdog *);
@@ -67,6 +68,7 @@ struct orion_watchdog {
struct watchdog_device wdt;
void __iomem *reg;
void __iomem *rstout;
+ void __iomem *rstout_mask;
unsigned long clk_rate;
struct clk *clk;
const struct orion_watchdog_data *data;
@@ -145,6 +147,27 @@ static int orion_wdt_ping(struct watchdog_device *wdt_dev)
return 0;
}

+static int armada375_start(struct watchdog_device *wdt_dev)
+{
+ struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+
+ /* Set watchdog duration */
+ writel(dev->clk_rate * wdt_dev->timeout,
+ dev->reg + dev->data->wdt_counter_offset);
+
+ /* Clear the watchdog expiration bit */
+ atomic_io_modify(dev->reg + TIMER_A370_STATUS, WDT_A370_EXPIRED, 0);
+
+ /* Enable watchdog timer */
+ atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit,
+ dev->data->wdt_enable_bit);
+
+ atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit,
+ dev->data->rstout_enable_bit);
+ atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit, 0);
+ return 0;
+}
+
static int armada370_start(struct watchdog_device *wdt_dev)
{
struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
@@ -205,6 +228,21 @@ static int orion_stop(struct watchdog_device *wdt_dev)
return 0;
}

+static int armada375_stop(struct watchdog_device *wdt_dev)
+{
+ struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+
+ /* Disable reset on watchdog */
+ atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit,
+ dev->data->rstout_mask_bit);
+ atomic_io_modify(dev->rstout, dev->data->rstout_enable_bit, 0);
+
+ /* Disable watchdog timer */
+ atomic_io_modify(dev->reg + TIMER_CTRL, dev->data->wdt_enable_bit, 0);
+
+ return 0;
+}
+
static int armada370_stop(struct watchdog_device *wdt_dev)
{
struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
@@ -235,6 +273,17 @@ static int orion_enabled(struct orion_watchdog *dev)
return enabled && running;
}

+static int armada375_enabled(struct orion_watchdog *dev)
+{
+ bool masked, enabled, running;
+
+ masked = readl(dev->rstout_mask) & dev->data->rstout_mask_bit;
+ enabled = readl(dev->rstout) & dev->data->rstout_enable_bit;
+ running = readl(dev->reg + TIMER_CTRL) & dev->data->wdt_enable_bit;
+
+ return !masked && enabled && running;
+}
+
static int orion_wdt_enabled(struct watchdog_device *wdt_dev)
{
struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
@@ -328,6 +377,28 @@ static const struct orion_watchdog_data armadaxp_data = {
.stop = armada370_stop,
};

+static const struct orion_watchdog_data armada375_data = {
+ .rstout_enable_bit = BIT(8),
+ .rstout_mask_bit = BIT(10),
+ .wdt_enable_bit = BIT(8),
+ .wdt_counter_offset = 0x34,
+ .clock_init = armada370_wdt_clock_init,
+ .enabled = armada375_enabled,
+ .start = armada375_start,
+ .stop = armada375_stop,
+};
+
+static const struct orion_watchdog_data armada380_data = {
+ .rstout_enable_bit = BIT(8),
+ .rstout_mask_bit = BIT(10),
+ .wdt_enable_bit = BIT(8),
+ .wdt_counter_offset = 0x34,
+ .clock_init = armadaxp_wdt_clock_init,
+ .enabled = armada375_enabled,
+ .start = armada375_start,
+ .stop = armada375_stop,
+};
+
static const struct of_device_id orion_wdt_of_match_table[] = {
{
.compatible = "marvell,orion-wdt",
@@ -341,6 +412,14 @@ static const struct of_device_id orion_wdt_of_match_table[] = {
.compatible = "marvell,armada-xp-wdt",
.data = &armadaxp_data,
},
+ {
+ .compatible = "marvell,armada-375-wdt",
+ .data = &armada375_data,
+ },
+ {
+ .compatible = "marvell,armada-380-wdt",
+ .data = &armada380_data,
+ },
{},
};
MODULE_DEVICE_TABLE(of, orion_wdt_of_match_table);
@@ -396,6 +475,25 @@ static int orion_wdt_probe(struct platform_device *pdev)
if (!dev->rstout)
return -ENOMEM;

+ } else if (of_device_is_compatible(node, "marvell,armada-375-wdt") ||
+ of_device_is_compatible(node, "marvell,armada-380-wdt")) {
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!res)
+ return -ENODEV;
+ dev->rstout = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!dev->rstout)
+ return -ENOMEM;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (!res)
+ return -ENODEV;
+ dev->rstout_mask = devm_ioremap(&pdev->dev, res->start,
+ resource_size(res));
+ if (!dev->rstout_mask)
+ return -ENOMEM;
+
} else {
return -ENODEV;
}
--
1.8.1.5