From: Dinh Nguyen <dingu...@opensource.altera.com>
In order for the Arria10 to be able to re-use the reset driver for SoCFPGA
Cyclone5/Arria5, we need to read the 'altr,modrst-offset' property from the
device tree entry. The 'altr,modrst-offset' property is the first register
into the reset manager that is used for bringing peripherals out of reset.
Signed-off-by: Dinh Nguyen <dingu...@opensource.altera.com>
---
drivers/reset/reset-socfpga.c | 19 +++++++++++++------
1 file changed, 13 insertions(+), 6 deletions(-)
diff --git a/drivers/reset/reset-socfpga.c b/drivers/reset/reset-socfpga.c
index 0a8def3..9074d41 100644
--- a/drivers/reset/reset-socfpga.c
+++ b/drivers/reset/reset-socfpga.c
@@ -24,11 +24,11 @@
#include <linux/types.h>
#define NR_BANKS 4
-#define OFFSET_MODRST 0x10
struct socfpga_reset_data {
spinlock_t lock;
void __iomem *membase;
+ u32 modrst_offset;
struct reset_controller_dev rcdev;
};
@@ -45,8 +45,8 @@ static int socfpga_reset_assert(struct reset_controller_dev
*rcdev,
spin_lock_irqsave(&data->lock, flags);
- reg = readl(data->membase + OFFSET_MODRST + (bank * NR_BANKS));
- writel(reg | BIT(offset), data->membase + OFFSET_MODRST +
+ reg = readl(data->membase + data->modrst_offset + (bank * NR_BANKS));
+ writel(reg | BIT(offset), data->membase + data->modrst_offset +
(bank * NR_BANKS));
spin_unlock_irqrestore(&data->lock, flags);
@@ -67,8 +67,8 @@ static int socfpga_reset_deassert(struct reset_controller_dev
*rcdev,
spin_lock_irqsave(&data->lock, flags);
- reg = readl(data->membase + OFFSET_MODRST + (bank * NR_BANKS));
- writel(reg & ~BIT(offset), data->membase + OFFSET_MODRST +
+ reg = readl(data->membase + data->modrst_offset + (bank * NR_BANKS));
+ writel(reg & ~BIT(offset), data->membase + data->modrst_offset +
(bank * NR_BANKS));
spin_unlock_irqrestore(&data->lock, flags);
@@ -85,7 +85,7 @@ static int socfpga_reset_status(struct reset_controller_dev
*rcdev,
int offset = id % BITS_PER_LONG;
u32 reg;
- reg = readl(data->membase + OFFSET_MODRST + (bank * NR_BANKS));
+ reg = readl(data->membase + data->modrst_offset + (bank * NR_BANKS));
return !(reg & BIT(offset));
}
@@ -100,6 +100,8 @@ static int socfpga_reset_probe(struct platform_device *pdev)
{
struct socfpga_reset_data *data;
struct resource *res;
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
/*
* The binding was mainlined without the required property.
@@ -120,6 +122,11 @@ static int socfpga_reset_probe(struct platform_device
*pdev)
if (IS_ERR(data->membase))
return PTR_ERR(data->membase);
+ if (of_property_read_u32(np, "altr,modrst-offset",
&data->modrst_offset)) {
+ dev_err(dev, "no altr,modrst-offset specified in device
tree\n");
+ return -ENODEV;
+ }
+
spin_lock_init(&data->lock);
data->rcdev.owner = THIS_MODULE;
--
2.4.5
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