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reset: sunxi: fix for 64-bit compilation 

The Allwinner reset controller has 32-bit registers, so translating
the reset cell number into a register and bit offset should not use
any architecture dependent data size. Otherwise this breaks for 64-bit
architectures like arm64.
Fix this by making it clear that it's the hardware register width which
matters here in the calculation.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Andre Przywara 2017-03-06 01:35:56 +00:00 committed by Philipp Zabel
parent 6270068202
commit 11282a49b7
1 changed files with 10 additions and 8 deletions
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18
drivers/reset/reset-sunxi.c
View File

@ -34,15 +34,16 @@ static int sunxi_reset_assert(struct reset_controller_dev *rcdev,
struct sunxi_reset_data *data = container_of(rcdev,
struct sunxi_reset_data,
rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
int reg_width = sizeof(u32);
int bank = id / (reg_width * BITS_PER_BYTE);
int offset = id % (reg_width * BITS_PER_BYTE);
unsigned long flags;
u32 reg;
spin_lock_irqsave(&data->lock, flags);
reg = readl(data->membase + (bank * 4));
writel(reg & ~BIT(offset), data->membase + (bank * 4));
reg = readl(data->membase + (bank * reg_width));
writel(reg & ~BIT(offset), data->membase + (bank * reg_width));
spin_unlock_irqrestore(&data->lock, flags);
@ -55,15 +56,16 @@ static int sunxi_reset_deassert(struct reset_controller_dev *rcdev,
struct sunxi_reset_data *data = container_of(rcdev,
struct sunxi_reset_data,
rcdev);
int bank = id / BITS_PER_LONG;
int offset = id % BITS_PER_LONG;
int reg_width = sizeof(u32);
int bank = id / (reg_width * BITS_PER_BYTE);
int offset = id % (reg_width * BITS_PER_BYTE);
unsigned long flags;
u32 reg;
spin_lock_irqsave(&data->lock, flags);
reg = readl(data->membase + (bank * 4));
writel(reg | BIT(offset), data->membase + (bank * 4));
reg = readl(data->membase + (bank * reg_width));
writel(reg | BIT(offset), data->membase + (bank * reg_width));
spin_unlock_irqrestore(&data->lock, flags);