--- .../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 <denisobrez...@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 <denisobrez...@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 <denisobrez...@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 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
