From 9620dfa49eddf9f360c370bef4e0517787fe8422 Mon Sep 17 00:00:00 2001
From: Christian Mauderer <christian.mauderer@embedded-brains.de>
Date: Tue, 15 Oct 2019 17:10:01 +0200
Subject: bsp/atsam: Use PIO for SC16IS752.

This allows to mix SC16IS752 chips with other interrupts.
---
 bsps/arm/atsam/include/bsp/sc16is752.h |  3 +++
 bsps/arm/atsam/spi/sc16is752.c         | 44 ++++++++++++++++++----------------
 2 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/bsps/arm/atsam/include/bsp/sc16is752.h b/bsps/arm/atsam/include/bsp/sc16is752.h
index 35d298a7ed..e8973efc46 100644
--- a/bsps/arm/atsam/include/bsp/sc16is752.h
+++ b/bsps/arm/atsam/include/bsp/sc16is752.h
@@ -15,6 +15,7 @@
 #ifndef LIBBSP_ARM_ATSAM_SC16IS752_H
 #define LIBBSP_ARM_ATSAM_SC16IS752_H
 
+#include <rtems/irq-extension.h>
 #include <libchip/chip.h>
 
 #include <dev/serial/sc16is752.h>
@@ -26,6 +27,8 @@ extern "C" {
 typedef struct {
   sc16is752_spi_context base;
   Pin irq_pin;
+  rtems_interrupt_server_entry irqs_entry; /* Internal. Don't touch. */
+  rtems_interrupt_server_action irqs_action; /* Internal. Don't touch. */
 } atsam_sc16is752_spi_context;
 
 /**
diff --git a/bsps/arm/atsam/spi/sc16is752.c b/bsps/arm/atsam/spi/sc16is752.c
index b17f9ffc14..8d38fe92d6 100644
--- a/bsps/arm/atsam/spi/sc16is752.c
+++ b/bsps/arm/atsam/spi/sc16is752.c
@@ -17,34 +17,40 @@
 
 #include <rtems/irq-extension.h>
 
-static void atsam_sc16i752_interrupt(void *arg)
+static void atsam_sc16i752_irqs_handler(void *arg)
 {
   atsam_sc16is752_spi_context *ctx = arg;
 
-  sc16is752_interrupt_handler(&ctx->base.base);
+    sc16is752_interrupt_handler(&ctx->base.base);
+    PIO_EnableIt(&ctx->irq_pin);
+}
+
+static void atsam_sc16i752_interrupt(const Pin *pin, void *arg)
+{
+  atsam_sc16is752_spi_context *ctx = arg;
 
-  /* Interrupt Status Register shall be read to clear the interrupt flag */
-  ctx->irq_pin.pio->PIO_ISR;
+  if(PIO_ItIsActive(&ctx->irq_pin)) {
+    PIO_DisableIt(&ctx->irq_pin);
+    rtems_interrupt_server_entry_submit(&ctx->irqs_entry);
+  }
 }
 
 static bool atsam_sc16is752_install_interrupt(sc16is752_context *base)
 {
   atsam_sc16is752_spi_context *ctx = (atsam_sc16is752_spi_context *)base;
   rtems_status_code sc;
+  uint8_t rv;
 
-  PIO_Configure(&ctx->irq_pin, 1);
-  PIO_EnableIt(&ctx->irq_pin);
+  sc = rtems_interrupt_server_entry_initialize(RTEMS_INTERRUPT_SERVER_DEFAULT,
+    &ctx->irqs_entry);
+  rtems_interrupt_server_action_prepend(&ctx->irqs_entry,
+    &ctx->irqs_action, atsam_sc16i752_irqs_handler, ctx);
 
-  sc = rtems_interrupt_server_handler_install(
-    RTEMS_ID_NONE,
-    ctx->irq_pin.id,
-    "Test",
-    RTEMS_INTERRUPT_SHARED,
-    atsam_sc16i752_interrupt,
-    ctx
-  );
+  rv = PIO_Configure(&ctx->irq_pin, 1);
+  PIO_ConfigureIt(&ctx->irq_pin, atsam_sc16i752_interrupt, ctx);
+  PIO_EnableIt(&ctx->irq_pin);
 
-  return sc == RTEMS_SUCCESSFUL;
+  return (sc == RTEMS_SUCCESSFUL) && (rv == 1);
 }
 
 static void atsam_sc16is752_remove_interrupt(sc16is752_context *base)
@@ -52,12 +58,8 @@ static void atsam_sc16is752_remove_interrupt(sc16is752_context *base)
   atsam_sc16is752_spi_context *ctx = (atsam_sc16is752_spi_context *)base;
   rtems_status_code sc;
 
-  sc = rtems_interrupt_server_handler_remove(
-    RTEMS_ID_NONE,
-    ctx->irq_pin.id,
-    atsam_sc16i752_interrupt,
-    ctx
-  );
+  PIO_DisableIt(&ctx->irq_pin);
+  sc = PIO_RemoveIt(&ctx->irq_pin, atsam_sc16i752_interrupt, ctx);
   assert(sc == RTEMS_SUCCESSFUL);
 }
 
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