soc/intel/apollolake: Add functions to calculate GPIO address

Provide iosf and GPIO functions for GPIO address
calculation.

BUG=chrome-os-partner:55877

Change-Id: I6eaa1fcecf5970b365e3418541c75b9866959f7e
Signed-off-by: Vaibhav Shankar <vaibhav.shankar@intel.com>
Reviewed-on: https://review.coreboot.org/16349
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

3 files changed, 20 insertions, 5 deletions

diff --git a/src/soc/intel/apollolake/gpio.c b/src/soc/intel/apollolake/gpio.c
index e56f147b5a..4731d56f85 100644
--- a/src/soc/intel/apollolake/gpio.c
+++ b/src/soc/intel/apollolake/gpio.c
@@ -177,6 +177,16 @@ void gpio_configure_pads(const struct pad_config *cfg, size_t num_pads)
 		gpio_configure_pad(cfg + i);
 }
 
+void * gpio_dwx_address(const uint16_t pad)
+{
+	/* Calculate Address of DW0 register for given GPIO
+	 * pad - GPIO number
+	 * returns - address of GPIO
+	 */
+	const struct pad_community *comm = gpio_get_community(pad);
+	return iosf_address(comm->port, PAD_CFG_OFFSET(pad - comm->first_pad));
+}
+
 void gpio_input_pulldown(gpio_t gpio)
 {
 	struct pad_config cfg = PAD_CFG_GPI(gpio, DN_20K, DEEP);
diff --git a/src/soc/intel/apollolake/include/soc/gpio.h b/src/soc/intel/apollolake/include/soc/gpio.h
index 00894448c8..473044aa59 100644
--- a/src/soc/intel/apollolake/include/soc/gpio.h
+++ b/src/soc/intel/apollolake/include/soc/gpio.h
@@ -160,6 +160,8 @@ struct pad_config {
 void gpio_configure_pad(const struct pad_config *cfg);
 void gpio_configure_pads(const struct pad_config *cfg, size_t num_pads);
 
+/* Calculate GPIO DW0 address */
+void * gpio_dwx_address(const uint16_t pad);
 /*
  * Set the GPIO groups for the GPE blocks. The values from PMC register GPE_CFG
  * are passed which is then mapped to proper groups for MISCCFG. This basically
diff --git a/src/soc/intel/apollolake/include/soc/iosf.h b/src/soc/intel/apollolake/include/soc/iosf.h
index ae3e8ec88a..f82c967c49 100644
--- a/src/soc/intel/apollolake/include/soc/iosf.h
+++ b/src/soc/intel/apollolake/include/soc/iosf.h
@@ -24,16 +24,19 @@
 #define  RTC_CONFIG			0x3400
 #define   RTC_CONFIG_UCMOS_ENABLE	(1 << 2)
 
+static inline void * iosf_address(uint16_t port, uint16_t reg)
+{
+	uintptr_t addr = (CONFIG_IOSF_BASE_ADDRESS | (port << 16) | (reg & ~3));
+	return (void *)addr;
+}
+
 inline static void iosf_write(uint16_t port, uint16_t reg, uint32_t val)
 {
-	uintptr_t base = CONFIG_IOSF_BASE_ADDRESS | (port << 16) | (reg & ~3);
-	write32((void *)base, val);
+	write32(iosf_address(port, reg), val);
 }
 
 inline static uint32_t iosf_read(uint16_t port, uint16_t reg)
 {
-	uintptr_t base = CONFIG_IOSF_BASE_ADDRESS | (port << 16) | (reg & ~3);
-	return read32((void *)base);
+	return read32(iosf_address(port, reg));
 }
-
 #endif /* _SOC_APOLLOLAKE_IOSF_H_ */