When CONFIG_SWAP_IO_SPACE is enabled, readl() and writel() are
changed to perform a byte swap to little endian type. This is
incorrect because the devices that use the irq-realtek-rtl driver
are all big endian MIPS chips.

Fix this by converting the MMIO accesses to __raw_readl() and
__raw_writel(), which do not byte swap the data.

Tested-by: Carlo Szelinsky <github@szelinsky.de>
Signed-off-by: Rustam Adilov <adilov@disroot.org>
---
Changes in v2:
 - Make the commit message clearer.

 drivers/irqchip/irq-realtek-rtl.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/irqchip/irq-realtek-rtl.c b/drivers/irqchip/irq-realtek-rtl.c
index 4b59e0cd86bf..3077f4efb4e2 100644
--- a/drivers/irqchip/irq-realtek-rtl.c
+++ b/drivers/irqchip/irq-realtek-rtl.c
@@ -50,18 +50,18 @@ static inline void enable_gimr(unsigned int cpu, unsigned int hw_irq)
 {
 	u32 gimr;
 
-	gimr = readl(REG(cpu, RTL_ICTL_GIMR));
+	gimr = __raw_readl(REG(cpu, RTL_ICTL_GIMR));
 	gimr |= BIT(hw_irq);
-	writel(gimr, REG(cpu, RTL_ICTL_GIMR));
+	__raw_writel(gimr, REG(cpu, RTL_ICTL_GIMR));
 }
 
 static inline void disable_gimr(unsigned int cpu, unsigned int hw_irq)
 {
 	u32 gimr;
 
-	gimr = readl(REG(cpu, RTL_ICTL_GIMR));
+	gimr = __raw_readl(REG(cpu, RTL_ICTL_GIMR));
 	gimr &= ~BIT(hw_irq);
-	writel(gimr, REG(cpu, RTL_ICTL_GIMR));
+	__raw_writel(gimr, REG(cpu, RTL_ICTL_GIMR));
 }
 
 static void write_irr(unsigned int cpu, int hw_irq, u32 value)
@@ -71,9 +71,9 @@ static void write_irr(unsigned int cpu, int hw_irq, u32 value)
 	unsigned int shift = IRR_SHIFT(hw_irq);
 	u32 irr;
 
-	irr = readl(irr0 + offset) & ~(0xf << shift);
+	irr = __raw_readl(irr0 + offset) & ~(0xf << shift);
 	irr |= (value & 0xf) << shift;
-	writel(irr, irr0 + offset);
+	__raw_writel(irr, irr0 + offset);
 }
 
 static void realtek_ictl_unmask_irq(struct irq_data *i)
@@ -159,7 +159,8 @@ static void realtek_irq_dispatch(struct irq_desc *desc)
 	unsigned int hw_irq;
 
 	chained_irq_enter(chip, desc);
-	pending = readl(REG(cpu, RTL_ICTL_GIMR)) & readl(REG(cpu, RTL_ICTL_GISR)) & output->mask;
+	pending = __raw_readl(REG(cpu, RTL_ICTL_GIMR)) &
+		  __raw_readl(REG(cpu, RTL_ICTL_GISR)) & output->mask;
 
 	if (unlikely(!pending)) {
 		spurious_interrupt();
-- 
2.55.0