soc/amd/common/include/acpimmio: reduce visibility of GPIO MMIO access

Introduce amdblocks/acpimmio_legacy_gpio100.h so that the old pre-SoC
chipsets can still access the raw GPIO100 and IOMUX ACPIMMIO registers
while only allowing GPIO accesses through the GPIO API on the SoCs.

Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Change-Id: I18872dfa40d53ba8b0d7802eec52ede5e2ae617a
Reviewed-on: https://review.coreboot.org/c/coreboot/+/56786
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martinroth@google.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/src/soc/amd/common/block/gpio_banks/gpio.c b/src/soc/amd/common/block/gpio_banks/gpio.c
index 6f566341eb..f32558aa59 100644
--- a/src/soc/amd/common/block/gpio_banks/gpio.c
+++ b/src/soc/amd/common/block/gpio_banks/gpio.c
@@ -31,6 +31,16 @@ static inline void gpio_write32(gpio_t gpio_num, uint32_t value)
 	write32(gpio_ctrl_ptr(gpio_num), value);
 }
 
+static inline uint8_t iomux_read8(uint8_t reg)
+{
+	return read8(acpimmio_iomux + reg);
+}
+
+static inline void iomux_write8(uint8_t reg, uint8_t value)
+{
+	write8(acpimmio_iomux + reg, value);
+}
+
 static uint8_t get_gpio_mux(gpio_t gpio)
 {
 	return iomux_read8(gpio);