[nrf52][gpio] use nrfx gpio library

Platform gpio driver now uses the nrfx library for gpio manipulation.
This allows utilization of second gpio bank present on some parts
and handling of errata.

platform/nrf52xxx/gpio.c

@@ -5,55 +5,44 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#include <lk/debug.h>
+
 #include <assert.h>
+#include <lk/debug.h>
+#include <lk/err.h>
 #include <dev/gpio.h>
-#include <platform/nrf52.h>
-#include <platform/gpio.h>
+#include <nrfx.h>
+#include <hal/nrf_gpio.h>
 
 int gpio_config(unsigned nr, unsigned flags) {
-    DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);
-
-    unsigned init;
+    if (!nrf_gpio_pin_present_check(nr)) {
+        return ERR_INVALID_ARGS;
+    }
 
     if (flags & GPIO_OUTPUT) {
-
-        NRF_P0->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos     | \
-                              GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos  | \
-                              GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos   | \
-                              GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos;
+        nrf_gpio_cfg_output(nr);
     } else { // GPIO_INPUT
+        nrf_gpio_pin_pull_t pull;
         if (flags & GPIO_PULLUP) {
-            init    =   GPIO_PIN_CNF_PULL_Pullup << GPIO_PIN_CNF_PULL_Pos;
+            pull = NRF_GPIO_PIN_PULLUP;
         } else if (flags & GPIO_PULLDOWN) {
-            init    =   GPIO_PIN_CNF_PULL_Pulldown << GPIO_PIN_CNF_PULL_Pos;
+            pull = NRF_GPIO_PIN_PULLDOWN;
         } else {
-            init    =   GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos;
+            pull = NRF_GPIO_PIN_NOPULL;
         }
-        NRF_P0->PIN_CNF[nr] = GPIO_PIN_CNF_DIR_Input      <<  GPIO_PIN_CNF_DIR_Pos    | \
-                              GPIO_PIN_CNF_INPUT_Connect  <<  GPIO_PIN_CNF_INPUT_Pos  | \
-                              init;
+        nrf_gpio_cfg_input(nr, pull);
     }
-    return 0;
+    return NO_ERROR;
 }
 
 void gpio_set(unsigned nr, unsigned on) {
-    DEBUG_ASSERT(nr <= NRF_MAX_PIN_NUMBER);
+    DEBUG_ASSERT(nrf_gpio_pin_present_check(nr));
 
-    if (on > 0) {
-        NRF_P0->OUTSET = 1 << nr;
-    } else {
-        NRF_P0->OUTCLR = 1 << nr;
-    }
+    nrf_gpio_pin_write(nr, on);
 }
 
 int gpio_get(unsigned nr) {
-    DEBUG_ASSERT( nr <= NRF_MAX_PIN_NUMBER );
+    DEBUG_ASSERT(nrf_gpio_pin_present_check(nr));
 
-    if ( NRF_P0->IN & ( 1 << nr) ) {
-        return 1;
-    } else {
-        return 0;
-    }
+    return (int)nrf_gpio_pin_read(nr);
 }
 

platform/nrf52xxx/include/platform/gpio.h

@@ -1,11 +0,0 @@
-/*
- * Copyright (c) 2016 Eric Holland
- *
- * Use of this source code is governed by a MIT-style
- * license that can be found in the LICENSE file or at
- * https://opensource.org/licenses/MIT
- */
-#pragma once
-
-#define NRF_MAX_PIN_NUMBER 31
-

platform/nrf52xxx/uart.c

@@ -18,7 +18,6 @@
 #include <dev/gpio.h>
 #include <kernel/thread.h>
 #include <platform/debug.h>
-#include <platform/gpio.h>
 #include <target/debugconfig.h>
 #include <target/gpioconfig.h>
 

target/nrf-pca10056/include/target/gpioconfig.h

@@ -8,8 +8,6 @@
 #ifndef __TARGET_GPIOCONFIG_H
 #define __TARGET_GPIOCONFIG_H
 
-#include <platform/gpio.h>
-
 #define GPIO_LED1   13
 #define GPIO_LED2   14
 #define GPIO_LED3   15

target/nrf-pca10056/init.c

@@ -11,7 +11,6 @@
 #include <lk/compiler.h>
 #include <nrfx_usbd.h>
 #include <dev/gpio.h>
-#include <platform/gpio.h>
 #include <platform/nrf52.h>
 #include <target/gpioconfig.h>