[rtems commit] bsp/atsam: Add SC16IS752 support
Sebastian Huber
sebh at rtems.org
Fri Dec 16 10:30:13 UTC 2016
Module: rtems
Branch: master
Commit: 08f1d2f79bc6bdd24bd4f322f348bb1b4555f0dc
Changeset: http://git.rtems.org/rtems/commit/?id=08f1d2f79bc6bdd24bd4f322f348bb1b4555f0dc
Author: Sebastian Huber <sebastian.huber at embedded-brains.de>
Date: Thu Dec 15 15:37:00 2016 +0100
bsp/atsam: Add SC16IS752 support
---
c/src/lib/libbsp/arm/atsam/Makefile.am | 2 +
c/src/lib/libbsp/arm/atsam/include/sc16is752.h | 67 ++++++++++++++++++++
c/src/lib/libbsp/arm/atsam/preinstall.am | 4 ++
c/src/lib/libbsp/arm/atsam/spi/sc16is752.c | 85 ++++++++++++++++++++++++++
4 files changed, 158 insertions(+)
diff --git a/c/src/lib/libbsp/arm/atsam/Makefile.am b/c/src/lib/libbsp/arm/atsam/Makefile.am
index e783023..7f0ed87 100644
--- a/c/src/lib/libbsp/arm/atsam/Makefile.am
+++ b/c/src/lib/libbsp/arm/atsam/Makefile.am
@@ -55,6 +55,7 @@ include_bsp_HEADERS += include/atsam-i2c.h
include_bsp_HEADERS += include/i2c.h
include_bsp_HEADERS += include/atsam-spi.h
include_bsp_HEADERS += include/spi.h
+include_bsp_HEADERS += include/sc16is752.h
include_bsp_HEADERS += include/power.h
include_libchipdir = $(includedir)/libchip
@@ -441,6 +442,7 @@ libbsp_a_SOURCES += i2c/atsam_i2c_init.c
# SPI
libbsp_a_SOURCES += spi/atsam_spi_bus.c
libbsp_a_SOURCES += spi/atsam_spi_init.c
+libbsp_a_SOURCES += spi/sc16is752.c
# RTC
libbsp_a_SOURCES += ../../shared/tod.c
diff --git a/c/src/lib/libbsp/arm/atsam/include/sc16is752.h b/c/src/lib/libbsp/arm/atsam/include/sc16is752.h
new file mode 100644
index 0000000..31f9660
--- /dev/null
+++ b/c/src/lib/libbsp/arm/atsam/include/sc16is752.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2016 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <info at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#ifndef LIBBSP_ARM_ATSAM_SC16IS752_H
+#define LIBBSP_ARM_ATSAM_SC16IS752_H
+
+#include <libchip/chip.h>
+
+#include <dev/serial/sc16is752.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+typedef struct {
+ sc16is752_spi_context base;
+ Pin irq_pin;
+} atsam_sc16is752_spi_context;
+
+/**
+ * @brief Creates an SPI connected SC16IS752 device.
+ *
+ * This devices uses the interrupt server, see
+ * rtems_interrupt_server_initialize().
+ *
+ * The device claims the interrupt of the PIO block.
+ *
+ * @param[in] ctx The device context. May have an arbitrary content.
+ * @param[in] device_path The device file path for the new device.
+ * @param[in] mode The SC16IS752 mode.
+ * @param[in] input_frequency The input frequency in Hertz of the SC16IS752
+ * chip. See XTAL1 and XTAL2 pins.
+ * @param[in] spi_path The SPI bus device path.
+ * @param[in] spi_chip_select The SPI chip select (starts with 1, not 0).
+ * @param[in] spi_speed_hz The SPI bus speed in Hertz.
+ * @param[in] irq_pin The interrupt pin, e.g. { PIO_PD28, PIOD, ID_PIOD,
+ * PIO_INPUT, PIO_IT_LOW_LEVEL }.
+ *
+ * @return See sc16is752_spi_create().
+ */
+int atsam_sc16is752_spi_create(
+ atsam_sc16is752_spi_context *ctx,
+ const char *device_path,
+ sc16is752_mode mode,
+ uint32_t input_frequency,
+ const char *spi_path,
+ uint8_t spi_chip_select,
+ uint32_t spi_speed_hz,
+ const Pin *irq_pin
+);
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* LIBBSP_ARM_ATSAM_SC16IS752_H */
diff --git a/c/src/lib/libbsp/arm/atsam/preinstall.am b/c/src/lib/libbsp/arm/atsam/preinstall.am
index e758252..15ccdfd 100644
--- a/c/src/lib/libbsp/arm/atsam/preinstall.am
+++ b/c/src/lib/libbsp/arm/atsam/preinstall.am
@@ -149,6 +149,10 @@ $(PROJECT_INCLUDE)/bsp/spi.h: include/spi.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/spi.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/spi.h
+$(PROJECT_INCLUDE)/bsp/sc16is752.h: include/sc16is752.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
+ $(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/sc16is752.h
+PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/sc16is752.h
+
$(PROJECT_INCLUDE)/bsp/power.h: include/power.h $(PROJECT_INCLUDE)/bsp/$(dirstamp)
$(INSTALL_DATA) $< $(PROJECT_INCLUDE)/bsp/power.h
PREINSTALL_FILES += $(PROJECT_INCLUDE)/bsp/power.h
diff --git a/c/src/lib/libbsp/arm/atsam/spi/sc16is752.c b/c/src/lib/libbsp/arm/atsam/spi/sc16is752.c
new file mode 100644
index 0000000..b17f9ff
--- /dev/null
+++ b/c/src/lib/libbsp/arm/atsam/spi/sc16is752.c
@@ -0,0 +1,85 @@
+
+/*
+ * Copyright (c) 2016 embedded brains GmbH. All rights reserved.
+ *
+ * embedded brains GmbH
+ * Dornierstr. 4
+ * 82178 Puchheim
+ * Germany
+ * <rtems at embedded-brains.de>
+ *
+ * The license and distribution terms for this file may be
+ * found in the file LICENSE in this distribution or at
+ * http://www.rtems.org/license/LICENSE.
+ */
+
+#include <bsp/sc16is752.h>
+
+#include <rtems/irq-extension.h>
+
+static void atsam_sc16i752_interrupt(void *arg)
+{
+ atsam_sc16is752_spi_context *ctx = arg;
+
+ sc16is752_interrupt_handler(&ctx->base.base);
+
+ /* Interrupt Status Register shall be read to clear the interrupt flag */
+ ctx->irq_pin.pio->PIO_ISR;
+}
+
+static bool atsam_sc16is752_install_interrupt(sc16is752_context *base)
+{
+ atsam_sc16is752_spi_context *ctx = (atsam_sc16is752_spi_context *)base;
+ rtems_status_code sc;
+
+ PIO_Configure(&ctx->irq_pin, 1);
+ PIO_EnableIt(&ctx->irq_pin);
+
+ sc = rtems_interrupt_server_handler_install(
+ RTEMS_ID_NONE,
+ ctx->irq_pin.id,
+ "Test",
+ RTEMS_INTERRUPT_SHARED,
+ atsam_sc16i752_interrupt,
+ ctx
+ );
+
+ return sc == RTEMS_SUCCESSFUL;
+}
+
+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
+ );
+ assert(sc == RTEMS_SUCCESSFUL);
+}
+
+int atsam_sc16is752_spi_create(
+ atsam_sc16is752_spi_context *ctx,
+ const char *device_path,
+ sc16is752_mode mode,
+ uint32_t input_frequency,
+ const char *spi_path,
+ uint8_t spi_chip_select,
+ uint32_t spi_speed_hz,
+ const Pin *irq_pin
+)
+{
+ ctx->base.base.mode = mode;
+ ctx->base.base.input_frequency = input_frequency;
+ ctx->base.base.install_irq = atsam_sc16is752_install_interrupt;
+ ctx->base.base.remove_irq = atsam_sc16is752_remove_interrupt;
+ ctx->base.spi_path = spi_path;
+ ctx->base.cs = spi_chip_select;
+ ctx->base.speed_hz = spi_speed_hz;
+ ctx->irq_pin = *irq_pin;
+
+ return sc16is752_spi_create(&ctx->base, device_path);
+}
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