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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>
This commit is contained in:
Ezequiel Garcia 2014-03-15 15:18:01 -03:00 committed by Wim Van Sebroeck
parent 1b0ea574ac
commit b483642fc3
1 changed files with 103 additions and 0 deletions
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103
drivers/watchdog/orion_wdt.c
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@ -55,6 +55,7 @@ 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 *);
@ -66,6 +67,7 @@ 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;
@ -144,6 +146,31 @@ 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);
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 @@ 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);
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 @@ 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);
@ -333,6 +389,28 @@ 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",
@ -346,6 +424,14 @@ 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);
@ -381,6 +467,23 @@ static int orion_wdt_get_regs(struct platform_device *pdev,
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;
}