watchdog: orion: Add Armada 375/380 SoC support
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@free-electrons.com>
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Jason Cooper <jason@lakedaemon.net>
Tested-by: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
Tested-by: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
diff --git a/drivers/watchdog/orion_wdt.c b/drivers/watchdog/orion_wdt.c
index ba316db..00d0741 100644
--- a/drivers/watchdog/orion_wdt.c
+++ b/drivers/watchdog/orion_wdt.c
@@ -55,6 +55,7 @@
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 *);
@@ -66,6 +67,7 @@
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;
@@ -144,6 +146,31 @@
return 0;
}
+static int armada375_start(struct watchdog_device *wdt_dev)
+{
+ struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+ u32 reg;
+
+ /* 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);
+
+ /* Enable reset on watchdog */
+ reg = readl(dev->rstout);
+ reg |= dev->data->rstout_enable_bit;
+ writel(reg, dev->rstout);
+
+ 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);
@@ -207,6 +234,24 @@
return 0;
}
+static int armada375_stop(struct watchdog_device *wdt_dev)
+{
+ struct orion_watchdog *dev = watchdog_get_drvdata(wdt_dev);
+ u32 reg;
+
+ /* Disable reset on watchdog */
+ atomic_io_modify(dev->rstout_mask, dev->data->rstout_mask_bit,
+ dev->data->rstout_mask_bit);
+ reg = readl(dev->rstout);
+ reg &= ~dev->data->rstout_enable_bit;
+ writel(reg, dev->rstout);
+
+ /* 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);
@@ -240,6 +285,17 @@
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);
@@ -333,6 +389,28 @@
.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",
@@ -346,6 +424,14 @@
.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);
@@ -381,6 +467,23 @@
if (IS_ERR(dev->rstout))
return PTR_ERR(dev->rstout);
+ } else if (of_device_is_compatible(node, "marvell,armada-375-wdt") ||
+ of_device_is_compatible(node, "marvell,armada-380-wdt")) {
+
+ /* Dedicated RSTOUT register, can be requested. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ dev->rstout = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(dev->rstout))
+ return PTR_ERR(dev->rstout);
+
+ 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;
}
