hw: aspeed_gpio: Fix memory size

Commit Message

Joel Stanley July 12, 2021, 1 p.m. UTC

The macro used to calculate the maximum memory size of the MMIO region
had a mistake, causing all GPIO models to create a mapping of 0x9D8.
The intent was to have it be 0x9D8 - 0x800.

This extra size doesn't matter on ast2400 and ast2500, which have a 4KB
region set aside for the GPIO controller.

On the ast2600 the 3.3V and 1.8V GPIO controllers are 2KB apart, so the
regions would overlap. Worse was the 1.8V controller would map over the
top of the following perianal, which happens to be the RTC.

The mmio region used by each device is a maximum of 2KB, so avoid the
calculations and hard code this as the maximum.

Fixes: 36d737ee82b2 ("hw/gpio: Add in AST2600 specific implementation")
Signed-off-by: Joel Stanley <[e-mail]>
---
 hw/gpio/aspeed_gpio.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Patch

diff --git a/hw/gpio/aspeed_gpio.c b/hw/gpio/aspeed_gpio.c
index 6ae0116be70b..b3dec4448009 100644
--- a/hw/gpio/aspeed_gpio.c
+++ b/hw/gpio/aspeed_gpio.c
@@ -207,7 +207,6 @@ 
 #define GPIO_1_8V_MEM_SIZE            0x9D8
 #define GPIO_1_8V_REG_ARRAY_SIZE      ((GPIO_1_8V_MEM_SIZE - \
                                       GPIO_1_8V_REG_OFFSET) >> 2)
-#define GPIO_MAX_MEM_SIZE           MAX(GPIO_3_6V_MEM_SIZE, GPIO_1_8V_MEM_SIZE)
 
 static int aspeed_evaluate_irq(GPIOSets *regs, int gpio_prev_high, int gpio)
 {
@@ -849,7 +848,7 @@  static void aspeed_gpio_realize(DeviceState *dev, Error **errp)
     }
 
     memory_region_init_io(&s->iomem, OBJECT(s), &aspeed_gpio_ops, s,
-            TYPE_ASPEED_GPIO, GPIO_MAX_MEM_SIZE);
+            TYPE_ASPEED_GPIO, 0x800);
 
     sysbus_init_mmio(sbd, &s->iomem);
 }