diff options
Diffstat (limited to 'bsps/riscv/griscv/console/console.c')
| -rw-r--r-- | bsps/riscv/griscv/console/console.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/bsps/riscv/griscv/console/console.c b/bsps/riscv/griscv/console/console.c new file mode 100644 index 0000000000..582b4c81b8 --- /dev/null +++ b/bsps/riscv/griscv/console/console.c @@ -0,0 +1,162 @@ +/* + * This file contains the TTY driver for the GRLIB APBUART + * + * This driver uses the termios pseudo driver. + * + * COPYRIGHT (c) 1989-1998. + * On-Line Applications Research Corporation (OAR). + * + * Modified for GRLIB BSP. + * COPYRIGHT (c) 2004. + * Gaisler Research. + * + * 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. + */ + +/* Define CONSOLE_USE_INTERRUPTS to enable APBUART interrupt handling instead + * of polling mode. + * + * Note that it is not possible to use the interrupt mode of the driver + * together with the "old" APBUART and -u to GRMON. However the new + * APBUART core (from GRLIB 1.0.17-b2710) has the GRMON debug bit and can + * handle interrupts. + * + * NOTE: This can be defined in the griscv.cfg file. + */ + +#include <bsp.h> +#include <bsp/fatal.h> +#include <amba.h> +#include <grlib/ambapp.h> +#include <grlib/apbuart_termios.h> +#include <rtems/console.h> +#include <string.h> + +/* The GRLIB BSP UART driver can rely on the Driver Manager if the + * DrvMgr is initialized during startup. Otherwise the classic driver + * must be used. + * + * The DrvMgr APBUART driver is located in the shared/uart directory + */ +#ifndef RTEMS_DRVMGR_STARTUP + +int syscon_uart_index __attribute__((weak)) = 0; + +/* body is in debugputs.c */ +static struct apbuart_context apbuarts[BSP_NUMBER_OF_TERMIOS_PORTS]; +static int uarts = 0; + +static rtems_termios_device_context *grlib_console_get_context(int index) +{ + struct apbuart_context *uart = &apbuarts[index]; + + rtems_termios_device_context_initialize(&uart->base, "APBUART"); + + return &uart->base; +} + +/* AMBA PP find routine. Extract AMBA PnP information into data structure. */ +static int find_matching_apbuart(struct ambapp_dev *dev, int index, void *arg) +{ + struct ambapp_apb_info *apb = (struct ambapp_apb_info *)dev->devinfo; + + /* Extract needed information of one APBUART */ + apbuarts[uarts].regs = (struct apbuart_regs *)apb->start; + apbuarts[uarts].irq = apb->irq; + /* Get APBUART core frequency, it is assumed that it is the same + * as Bus frequency where the UART is situated + */ + apbuarts[uarts].freq_hz = ambapp_freq_get(&ambapp_plb, dev); + uarts++; + + if (uarts >= BSP_NUMBER_OF_TERMIOS_PORTS) + return 1; /* Satisfied number of UARTs, stop search */ + else + return 0; /* Continue searching for more UARTs */ +} + +/* Find all UARTs */ +static void grlib_console_scan_uarts(void) +{ + memset(apbuarts, 0, sizeof(apbuarts)); + + /* Find APBUART cores */ + ambapp_for_each(&ambapp_plb, (OPTIONS_ALL|OPTIONS_APB_SLVS), VENDOR_GAISLER, + GAISLER_APBUART, find_matching_apbuart, NULL); +} + +rtems_device_driver console_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg +) +{ + const rtems_termios_device_handler *handler = +#if CONSOLE_USE_INTERRUPTS + &apbuart_handler_interrupt; +#else + &apbuart_handler_polled; +#endif + rtems_status_code status; + int i; + char console_name[16]; + + rtems_termios_initialize(); + + /* Find UARTs */ + grlib_console_scan_uarts(); + + /* Update syscon_uart_index to index used as /dev/console + * Let user select System console by setting syscon_uart_index. If the + * BSP is to provide the default UART (syscon_uart_index==0): + * non-MP: APBUART[0] is system console + * MP: LEON CPU index select UART + */ + if (syscon_uart_index == 0) { +#if defined(RTEMS_MULTIPROCESSING) + syscon_uart_index = GRLIB_Cpu_Index; +#else + syscon_uart_index = 0; +#endif + } else { + syscon_uart_index = syscon_uart_index - 1; /* User selected sys-console */ + } + + /* Register Device Names + * + * 0 /dev/console - APBUART[USER-SELECTED, DEFAULT=APBUART[0]] + * 1 /dev/console_a - APBUART[0] (by default not present because is console) + * 2 /dev/console_b - APBUART[1] + * ... + * + * On a MP system one should not open UARTs that other OS instances use. + */ + if (syscon_uart_index < uarts) { + status = rtems_termios_device_install( + CONSOLE_DEVICE_NAME, + handler, + NULL, + grlib_console_get_context(syscon_uart_index) + ); + if (status != RTEMS_SUCCESSFUL) + bsp_fatal(LEON3_FATAL_CONSOLE_REGISTER_DEV); + } + strcpy(console_name,"/dev/console_a"); + for (i = 0; i < uarts; i++) { + if (i == syscon_uart_index) + continue; /* skip UART that is registered as /dev/console */ + console_name[13] = 'a' + i; + rtems_termios_device_install( + console_name, + handler, + NULL, + grlib_console_get_context(i) + ); + } + + return RTEMS_SUCCESSFUL; +} + +#endif |