[PATCH v2 11/15] HiFive1: add UART support

Denis Obrezkov denisobrezkov at gmail.com
Mon Aug 21 23:56:28 UTC 2017


---
 .../libbsp/riscv32/hifive1/console/fe310-uart.c    | 218 +++++++++++++++++++++
 .../libbsp/riscv32/hifive1/include/fe310-gpio.h    |  41 ++++
 .../libbsp/riscv32/hifive1/include/fe310-uart.h    |  38 ++++
 3 files changed, 297 insertions(+)
 create mode 100644 c/src/lib/libbsp/riscv32/hifive1/console/fe310-uart.c
 create mode 100644 c/src/lib/libbsp/riscv32/hifive1/include/fe310-gpio.h
 create mode 100644 c/src/lib/libbsp/riscv32/hifive1/include/fe310-uart.h

diff --git a/c/src/lib/libbsp/riscv32/hifive1/console/fe310-uart.c b/c/src/lib/libbsp/riscv32/hifive1/console/fe310-uart.c
new file mode 100644
index 0000000..acb8004
--- /dev/null
+++ b/c/src/lib/libbsp/riscv32/hifive1/console/fe310-uart.c
@@ -0,0 +1,218 @@
+/*
+ * Copyright (c) 2017 Denis Obrezkov <denisobrezkov at gmail.com>
+ *
+ * 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 <rtems/console.h>
+#include <rtems/termiostypes.h>
+#include <termios.h>
+#include <bsp/prci.h>
+#include <bsp/fe310-uart.h>
+#include <bsp/fe310-gpio.h>
+#include <bsp/fe310.h>
+#include <bsp/fatal.h>
+#include <bsp/console-polled.h>
+
+/*
+ * TODO: UART code should be separated from the console code,
+ * uart_num probably should be an enumeration in the future
+ */
+void fe310_enable_uart (volatile fe310_gpio_t * gpio, uint32_t uart_num)
+{
+  if (uart_num == 0) {
+    gpio->iof_sel &= ~IOF0_UART0_MASK;
+    gpio->iof_en |= IOF0_UART0_MASK;
+  } else
+  if (uart_num == 1) {
+    gpio->iof_sel &= ~IOF0_UART1_MASK;
+    gpio->iof_en |= IOF0_UART1_MASK;  
+  } else {
+    return;
+  }
+}
+
+void fe310_disable_uart (volatile fe310_gpio_t * gpio, uint32_t uart_num)
+{
+  if (uart_num == 0) {
+    gpio->iof_en &= ~IOF0_UART0_MASK;
+  } else
+  if (uart_num == 1) {
+    gpio->iof_en &= ~IOF0_UART1_MASK;
+  } else {
+    return;
+  }
+}
+
+static void fe310_console_putc (char ch);
+
+fe310_uart_context driver_context = {
+  .base = RTEMS_TERMIOS_DEVICE_CONTEXT_INITIALIZER("FE310_UART0"),
+  .device_name = "/dev/console",
+  .regs = (volatile fe310_uart_t *) &FE310_UART0,
+};
+
+rtems_device_driver console_initialize(
+  rtems_device_major_number  major,
+  rtems_device_minor_number  minor,
+  void                      *arg
+)
+{ 
+  rtems_status_code sc;
+  const rtems_termios_device_handler *handler = &fe310_uart_handler_polled;
+  
+  /*
+   * Initialize the Termios infrastructure.  If Termios has already
+   * been initialized by another device driver, then this call will
+   * have no effect.
+   */
+  rtems_termios_initialize();
+  fe310_uart_context * ctx = &driver_context;
+    /*
+     * Install this device in the file system and Termios.  In order
+     * to use the console (i.e. being able to do printf, scanf etc.
+     * on stdin, stdout and stderr), one device must be registered as
+     * "/dev/console" (CONSOLE_DEVICE_NAME).
+     */
+  sc = rtems_termios_device_install(
+      ctx->device_name,
+      handler,
+      NULL,
+      &ctx->base
+  );
+  if ( sc != RTEMS_SUCCESSFUL ) {
+    bsp_fatal(BSP_FATAL_CONSOLE_NO_DEV);
+  }
+
+  return RTEMS_SUCCESSFUL;
+}
+
+static bool fe310_uart_first_open (
+  rtems_termios_tty             *tty,
+  rtems_termios_device_context  *base,
+  struct termios                *term,
+  rtems_libio_open_close_args_t *args
+)
+{
+  fe310_uart_context * ctx;
+  rtems_status_code sc;
+
+  /* Configure GPIO to be UART */
+  fe310_enable_uart((volatile fe310_gpio_t *)&FE310_GPIO, 0);
+
+  sc = rtems_termios_set_initial_baud (tty, B115200);
+  if ( sc != RTEMS_SUCCESSFUL ) {
+    return false;
+  }
+
+  /* Set up a baud rate and enable tx and rx */
+  ctx = (fe310_uart_context *) base;
+  (ctx->regs)->div = hifive1_default_freq / 115200 - 1;
+  (ctx->regs)->txctrl |= 1;
+  (ctx->regs)->rxctrl |= 1;
+  return true;
+};
+
+static void fe310_uart_last_close (
+  rtems_termios_tty             *tty,
+  rtems_termios_device_context  *base,
+  rtems_libio_open_close_args_t *args
+)
+{
+  fe310_disable_uart((volatile fe310_gpio_t *)&FE310_GPIO, 0);
+}
+
+static int fe310_uart_poll_read (
+  rtems_termios_device_context  *base
+)
+{
+  fe310_uart_context * ctx = (fe310_uart_context*) base;
+  size_t i;
+  
+  if (((ctx->regs->rxdata) & TXRXREADY) != 0) {
+    return -1;
+  } else {
+    return ctx->regs->rxdata;
+  }  
+}
+
+static ssize_t fe310_uart_poll_write (
+  rtems_termios_device_context  *base,
+  const char                    *buf,
+  size_t                        n
+)
+{
+  fe310_uart_context * ctx = (fe310_uart_context*) base;
+  size_t i;
+
+  rtems_status_code sc;
+
+  fe310_enable_uart((volatile fe310_gpio_t *)&FE310_GPIO, 0);
+
+  (ctx->regs)->div = hifive1_default_freq / 115200 - 1;
+  (ctx->regs)->txctrl |= 1;
+  (ctx->regs)->rxctrl |= 1;
+
+  for (i = 0; i < n; ++i) {
+    while (((ctx->regs->txdata) & TXRXREADY) != 0) {
+        ;
+    }
+    ctx->regs->txdata = buf[i];
+  }
+  return n;
+}
+
+static void fe310_console_putc (char ch) {
+  fe310_uart_poll_write ( (rtems_termios_device_context *)&driver_context, &ch, 1);
+}
+
+static bool fe310_uart_set_attributes(
+  rtems_termios_device_context  *base,
+  const struct termios          *term
+)
+{
+  return true;
+}
+
+const rtems_termios_device_handler fe310_uart_handler_polled = {
+  .first_open = fe310_uart_first_open,
+  .last_close = fe310_uart_last_close,
+  .poll_read = fe310_uart_poll_read,
+  .write = fe310_uart_poll_write,
+  .set_attributes = fe310_uart_set_attributes,
+  .ioctl = NULL,
+  .mode = TERMIOS_POLLED
+};
+
+void console_outbyte_polled(
+  int port,
+  char ch
+)
+{
+  fe310_console_putc(ch);   
+}
+
+int console_inbyte_nonblocking(
+  int port
+)
+{
+  return -1;
+}
+
+void console_initialize_hardware (void)
+{
+  volatile fe310_gpio_t * gpio;
+  volatile fe310_uart_t * uregs = (volatile fe310_uart_t *) &FE310_UART0;
+  rtems_status_code sc;
+  
+  fe310_enable_uart((volatile fe310_gpio_t *)&FE310_GPIO, 0);
+  
+  uregs->div = hifive1_default_freq / 115200 - 1;
+  uregs->txctrl |= 1;
+  return;
+}
+
+#include <rtems/bspIo.h>
+BSP_output_char_function_type  BSP_output_char = fe310_console_putc;
diff --git a/c/src/lib/libbsp/riscv32/hifive1/include/fe310-gpio.h b/c/src/lib/libbsp/riscv32/hifive1/include/fe310-gpio.h
new file mode 100644
index 0000000..d5332fc
--- /dev/null
+++ b/c/src/lib/libbsp/riscv32/hifive1/include/fe310-gpio.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2017 Denis Obrezkov <denisobrezkov at gmail.com>
+ *
+ * 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 FE310_GPIO_H
+#define FE310_GPIO_H
+
+
+#include <rtems/termiostypes.h>
+#include <rtems/irq.h>
+
+#define IOF0_UART0_MASK 0x00030000
+#define IOF0_UART1_MASK 0x00300000
+
+typedef struct {
+  uint32_t value;
+  uint32_t input_en;
+  uint32_t output_en;
+  uint32_t port;
+  uint32_t pue;
+  uint32_t ds;
+  uint32_t rise_ie;
+  uint32_t rise_ip;
+  uint32_t fall_ie;
+  uint32_t fall_ip;
+  uint32_t high_ie;
+  uint32_t high_ip;
+  uint32_t low_ie;
+  uint32_t low_ip;
+  uint32_t iof_en;
+  uint32_t iof_sel;
+  uint32_t out_xor;
+} fe310_gpio_t;
+
+
+
+#endif /* FE310_GPIO_H */
diff --git a/c/src/lib/libbsp/riscv32/hifive1/include/fe310-uart.h b/c/src/lib/libbsp/riscv32/hifive1/include/fe310-uart.h
new file mode 100644
index 0000000..99b7adc
--- /dev/null
+++ b/c/src/lib/libbsp/riscv32/hifive1/include/fe310-uart.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2017 Denis Obrezkov <denisobrezkov at gmail.com>
+ *
+ * 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 FE310_UART_H
+#define FE310_UART_H
+
+#define TXRXREADY (1 << 31)
+
+#include <rtems/termiostypes.h>
+#include <rtems/irq.h>
+
+typedef struct {
+  uint32_t txdata;
+  uint32_t rxdata;
+  uint32_t txctrl;
+  uint32_t rxctrl;
+  uint32_t ie;
+  uint32_t ip;
+  uint32_t div;
+} fe310_uart_t;
+
+/* Low-level driver specific data structure */
+typedef struct {
+  rtems_termios_device_context base;
+  const char *device_name;
+  volatile fe310_uart_t *regs;
+} fe310_uart_context;
+
+extern const rtems_termios_device_handler fe310_uart_handler_polled;
+
+extern fe310_uart_context driver_context;
+
+#endif /* FE310_UART_H */
-- 
2.1.4




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