diff options
Diffstat (limited to 'c/src/lib/libcpu/sh/sh7750/sci/sh4uart.c')
| -rw-r--r-- | c/src/lib/libcpu/sh/sh7750/sci/sh4uart.c | 910 |
1 files changed, 0 insertions, 910 deletions
diff --git a/c/src/lib/libcpu/sh/sh7750/sci/sh4uart.c b/c/src/lib/libcpu/sh/sh7750/sci/sh4uart.c deleted file mode 100644 index 7acc1de337..0000000000 --- a/c/src/lib/libcpu/sh/sh7750/sci/sh4uart.c +++ /dev/null @@ -1,910 +0,0 @@ -/* - * Generic UART Serial driver for SH-4 processors - * - * Copyright (C) 2000 OKTET Ltd., St.-Petersburg, Russian Fed. - * Author: Alexandra Kossovsky <sasha@oktet.ru> - * - * COPYRIGHT (c) 1989-2000. - * On-Line Applications Research Corporation (OAR). - * - * 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.h> -#include <termios.h> -#include <rtems/libio.h> -#include <bsp.h> -#include "sh/sh4uart.h" - -#ifndef SH4_UART_INTERRUPT_LEVEL -#define SH4_UART_INTERRUPT_LEVEL 4 -#endif - -/* Forward function declarations */ -static rtems_isr -sh4uart1_interrupt_transmit(rtems_vector_number vec); -static rtems_isr -sh4uart1_interrupt_receive(rtems_vector_number vec); -static rtems_isr -sh4uart2_interrupt_transmit(rtems_vector_number vec); -static rtems_isr -sh4uart2_interrupt_receive(rtems_vector_number vec); - -/* - * sh4uart_init -- - * This function verifies the input parameters and perform initialization - * of the SH-4 on-chip UART descriptor structure. - * - * PARAMETERS: - * uart - pointer to the UART channel descriptor structure - * tty - pointer to termios structure - * chn - channel number (SH4_SCI/SH4_SCIF -- 1/2) - * int_driven - interrupt-driven (1) or polled (0) I/O mode - * - * RETURNS: - * RTEMS_SUCCESSFUL if all parameters are valid, or error code - */ -rtems_status_code -sh4uart_init(sh4uart *uart, void *tty, int chn, int int_driven) -{ - if (uart == NULL) - return RTEMS_INVALID_ADDRESS; - - if ((chn != SH4_SCI) && (chn != SH4_SCIF)) - return RTEMS_INVALID_NUMBER; - - uart->chn = chn; - uart->tty = tty; - uart->int_driven = int_driven; - -#if 0 - sh4uart_poll_write(uart, "init", 4); -#endif - return RTEMS_SUCCESSFUL; -} - -/* - * sh4uart_get_Pph -- - * Get current peripheral module clock. - * - * PARAMETERS: none; - * Cpu clock is get from CPU_CLOCK_RATE_HZ marco - * (defined in bspopts.h, included from bsp.h) - * - * RETURNS: - * peripheral module clock in Hz. - */ -static uint32_t -sh4uart_get_Pph(void) -{ - uint16_t frqcr = *(volatile uint16_t*)SH7750_FRQCR; - uint32_t Pph = CPU_CLOCK_RATE_HZ; - - switch (frqcr & SH7750_FRQCR_IFC) { - case SH7750_FRQCR_IFCDIV1: break; - case SH7750_FRQCR_IFCDIV2: Pph *= 2; break; - case SH7750_FRQCR_IFCDIV3: Pph *= 3; break; - case SH7750_FRQCR_IFCDIV4: Pph *= 4; break; - case SH7750_FRQCR_IFCDIV6: Pph *= 6; break; - case SH7750_FRQCR_IFCDIV8: Pph *= 8; break; - default: /* unreachable */ - break; - } - - switch (frqcr & SH7750_FRQCR_PFC) { - case SH7750_FRQCR_PFCDIV2: Pph /= 2; break; - case SH7750_FRQCR_PFCDIV3: Pph /= 3; break; - case SH7750_FRQCR_PFCDIV4: Pph /= 4; break; - case SH7750_FRQCR_PFCDIV6: Pph /= 6; break; - case SH7750_FRQCR_PFCDIV8: Pph /= 8; break; - default: /* unreachable */ - break; - } - - return Pph; -} - -/* - * sh4uart_set_baudrate -- - * Program the UART timer to specified baudrate - * - * PARAMETERS: - * uart - pointer to UART descriptor structure - * baud - termios baud rate (B50, B9600, etc...) - * - * ALGORITHM: - * see SH7750 Hardware Manual. - * - * RETURNS: - * none - */ -static void -sh4uart_set_baudrate(sh4uart *uart, speed_t baud) -{ - uint32_t rate; - int16_t div; - int n; - uint32_t Pph = sh4uart_get_Pph(); - - switch (baud) { - case B50: rate = 50; break; - case B75: rate = 75; break; - case B110: rate = 110; break; - case B134: rate = 134; break; - case B150: rate = 150; break; - case B200: rate = 200; break; - case B300: rate = 300; break; - case B600: rate = 600; break; - case B1200: rate = 1200; break; - case B2400: rate = 2400; break; - case B4800: rate = 4800; break; - case B9600: rate = 9600; break; - case B19200: rate = 19200; break; - case B38400: rate = 38400; break; - case B57600: rate = 57600; break; -#ifdef B115200 - case B115200: rate = 115200; break; -#endif -#ifdef B230400 - case B230400: rate = 230400; break; -#endif - default: rate = 9600; break; - } - - for (n = 0; n < 4; n++) { - div = Pph / (32 * (1 << (2 * n)) * rate) - 1; - if (div < 0x100) - break; - } - - /* Set default baudrate if specified baudrate is impossible */ - if (n >= 4) - sh4uart_set_baudrate(uart, B9600); - - if ( uart->chn == 1 ) { - volatile uint8_t *smr1 = (volatile uint8_t *)SH7750_SCSMR1; - *smr1 &= ~SH7750_SCSMR_CKS; - *smr1 |= n << SH7750_SCSMR_CKS_S; - } else { - volatile uint16_t *smr2 = (volatile uint16_t *)SH7750_SCSMR2; - *smr2 &= ~SH7750_SCSMR_CKS; - *smr2 |= n << SH7750_SCSMR_CKS_S; - } - - SCBRR(uart->chn) = div; - /* Wait at least 1 bit interwal */ - rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(1000 / rate)); -} - -/* - * sh4uart_reset -- - * This function perform the hardware initialization of SH-4 - * on-chip UART controller using parameters - * filled by the sh4uart_init function. - * - * PARAMETERS: - * uart - pointer to UART channel descriptor structure - * - * RETURNS: - * RTEMS_SUCCESSFUL if channel is initialized successfully, error - * code in other case - */ -rtems_status_code -sh4uart_reset(sh4uart *uart) -{ - register int chn; - register int int_driven; - rtems_status_code rc; - uint16_t tmp; - - if (uart == NULL) - return RTEMS_INVALID_ADDRESS; - - chn = uart->chn; - int_driven = uart->int_driven; - - if ( chn == 1 ) { - volatile uint8_t *scr1 = (volatile uint8_t *)SH7750_SCSCR1; - volatile uint8_t *smr1 = (volatile uint8_t *)SH7750_SCSMR1; - *scr1 = 0x0; /* Is set properly at the end of this function */ - *smr1 = 0x0; /* 8-bit, non-parity, 1 stop bit, pf/1 clock */ - } else { - volatile uint16_t *scr2 = (volatile uint16_t *)SH7750_SCSCR2; - volatile uint16_t *smr2 = (volatile uint16_t *)SH7750_SCSMR2; - *scr2 = 0x0; /* Is set properly at the end of this function */ - *smr2 = 0x0; /* 8-bit, non-parity, 1 stop bit, pf/1 clock */ - } - - if (chn == SH4_SCIF) - SCFCR2 = SH7750_SCFCR2_TFRST | SH7750_SCFCR2_RFRST | - SH7750_SCFCR2_RTRG_1 | SH7750_SCFCR2_TTRG_4; - - if (chn == SH4_SCI) - SCSPTR1 = int_driven ? 0x0 : SH7750_SCSPTR1_EIO; - else - SCSPTR2 = SH7750_SCSPTR2_RTSDT; - - if (int_driven) { - uint16_t ipr; - - if (chn == SH4_SCI) { - ipr = IPRB; - ipr &= ~SH7750_IPRB_SCI1; - ipr |= SH4_UART_INTERRUPT_LEVEL << SH7750_IPRB_SCI1_S; - IPRB = ipr; - - rc = rtems_interrupt_catch(sh4uart1_interrupt_transmit, - SH7750_EVT_TO_NUM(SH7750_EVT_SCI_TXI), - &uart->old_handler_transmit); - if (rc != RTEMS_SUCCESSFUL) - return rc; - - rc = rtems_interrupt_catch(sh4uart1_interrupt_receive, - SH7750_EVT_TO_NUM(SH7750_EVT_SCI_RXI), - &uart->old_handler_receive); - if (rc != RTEMS_SUCCESSFUL) - return rc; - } else { - ipr = IPRC; - ipr &= ~SH7750_IPRC_SCIF; - ipr |= SH4_UART_INTERRUPT_LEVEL << SH7750_IPRC_SCIF_S; - IPRC = ipr; - - rc = rtems_interrupt_catch(sh4uart2_interrupt_transmit, - SH7750_EVT_TO_NUM(SH7750_EVT_SCIF_TXI), - &uart->old_handler_transmit); - if (rc != RTEMS_SUCCESSFUL) - return rc; - rc = rtems_interrupt_catch(sh4uart2_interrupt_receive, - SH7750_EVT_TO_NUM(SH7750_EVT_SCIF_RXI), - &uart->old_handler_receive); - if (rc != RTEMS_SUCCESSFUL) - return rc; - } - uart->tx_buf = NULL; - uart->tx_ptr = uart->tx_buf_len = 0; - } - - sh4uart_set_baudrate(uart, B38400); /* debug defaults (unfortunately, - it is differ to termios default */ - - tmp = SH7750_SCSCR_TE | SH7750_SCSCR_RE | - (chn == SH4_SCI ? 0x0 : SH7750_SCSCR2_REIE) | - (int_driven ? (SH7750_SCSCR_RIE | SH7750_SCSCR_TIE) : 0x0); - - if ( chn == 1 ) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr = tmp; - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr = tmp; - } - - return RTEMS_SUCCESSFUL; -} - -/* - * sh4uart_disable -- - * This function disable the operations on SH-4 UART controller - * - * PARAMETERS: - * uart - pointer to UART channel descriptor structure - * disable_port - disable receive and transmit on the port - * - * RETURNS: - * RTEMS_SUCCESSFUL if UART closed successfuly, or error code in - * other case - */ -rtems_status_code -sh4uart_disable(sh4uart *uart, int disable_port) -{ - rtems_status_code rc; - - if (disable_port) { - if ( uart->chn == 1 ) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr &= ~(SH7750_SCSCR_TE | SH7750_SCSCR_RE); - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr &= ~(SH7750_SCSCR_TE | SH7750_SCSCR_RE); - } - } - - if (uart->int_driven) { - rc = rtems_interrupt_catch(uart->old_handler_transmit, - uart->chn == SH4_SCI ? SH7750_EVT_SCI_TXI : SH7750_EVT_SCIF_TXI, - NULL); - if (rc != RTEMS_SUCCESSFUL) - return rc; - rc = rtems_interrupt_catch(uart->old_handler_receive, - uart->chn == SH4_SCI ? SH7750_EVT_SCI_RXI : SH7750_EVT_SCIF_RXI, - NULL); - if (rc != RTEMS_SUCCESSFUL) - return rc; - } - - return RTEMS_SUCCESSFUL; -} - -/* - * sh4uart_set_attributes -- - * This function parse the termios attributes structure and perform - * the appropriate settings in hardware. - * - * PARAMETERS: - * uart - pointer to the UART descriptor structure - * t - pointer to termios parameters - * - * RETURNS: - * RTEMS_SUCCESSFUL - */ -rtems_status_code -sh4uart_set_attributes(sh4uart *uart, const struct termios *t) -{ - int level; - speed_t baud; - uint16_t smr; - - smr = (uint16_t)(*(uint8_t*)SH7750_SCSMR(uart->chn)); - - baud = cfgetospeed(t); - - /* Set flow control XXX*/ - if ((t->c_cflag & CRTSCTS) != 0) { - } - - /* Set character size -- only 7 or 8 bit */ - switch (t->c_cflag & CSIZE) { - case CS5: - case CS6: - case CS7: smr |= SH7750_SCSMR_CHR_7; break; - case CS8: smr &= ~SH7750_SCSMR_CHR_7; break; - } - - /* Set number of stop bits */ - if ((t->c_cflag & CSTOPB) != 0) - smr |= SH7750_SCSMR_STOP_2; - else - smr &= ~SH7750_SCSMR_STOP_2; - - /* Set parity mode */ - if ((t->c_cflag & PARENB) != 0) { - smr |= SH7750_SCSMR_PE; - if ((t->c_cflag & PARODD) != 0) - smr |= SH7750_SCSMR_PM_ODD; - else - smr &= ~SH7750_SCSMR_PM_ODD; - } else - smr &= ~SH7750_SCSMR_PE; - - rtems_interrupt_disable(level); - /* wait untill all data is transmitted */ - /* XXX JOEL says this is broken -- interrupts are OFF so NO ticks */ - rtems_task_wake_after(RTEMS_MILLISECONDS_TO_TICKS(100)); - - if ( uart->chn == 1 ) { - volatile uint8_t *scrP = (volatile uint8_t *)SH7750_SCSCR1; - volatile uint8_t *smrP = (volatile uint8_t *)SH7750_SCSMR1; - - *scrP &= ~(SH7750_SCSCR_TE | SH7750_SCSCR_RE); /* disable operations */ - sh4uart_set_baudrate(uart, baud); - *smrP = (uint8_t)smr; - *scrP |= SH7750_SCSCR_TE | SH7750_SCSCR_RE; /* enable operations */ - } else { - volatile uint16_t *scrP = (volatile uint16_t *)SH7750_SCSCR2; - volatile uint16_t *smrP = (volatile uint16_t *)SH7750_SCSMR2; - - *scrP &= ~(SH7750_SCSCR_TE | SH7750_SCSCR_RE); /* disable operations */ - sh4uart_set_baudrate(uart, baud); - *smrP = (uint8_t)smr; - *scrP |= SH7750_SCSCR_TE | SH7750_SCSCR_RE; /* enable operations */ - } - - rtems_interrupt_enable(level); - - return RTEMS_SUCCESSFUL; -} - -/* - * sh4uart_handle_error -- - * Perfoms error (Overrun, Framing & Parity) handling - * - * PARAMETERS: - * uart - pointer to UART descriptor structure - * - * RETURNS: - * nothing - */ -static void -sh4uart_handle_error(sh4uart *uart) -{ - if (uart->chn == SH4_SCI) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr &= ~(SH7750_SCSSR1_ORER | SH7750_SCSSR1_FER | SH7750_SCSSR1_PER); - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr &= ~(SH7750_SCSSR2_ER | SH7750_SCSSR2_BRK | SH7750_SCSSR2_FER); - *scr &= ~(SH7750_SCLSR2_ORER); - } -} - -/* - * sh4uart_poll_read -- - * This function tried to read character from SH-4 UART and perform - * error handling. When parity or framing error occured, return - * value dependent on termios input mode flags: - * - received character, if IGNPAR == 1 - * - 0, if IGNPAR == 0 and PARMRK == 0 - * - 0xff and 0x00 on next poll_read invocation, if IGNPAR == 0 and - * PARMRK == 1 - * - * PARAMETERS: - * uart - pointer to UART descriptor structure - * - * RETURNS: - * code of received character or -1 if no characters received. - */ -int -sh4uart_poll_read(sh4uart *uart) -{ - int chn = uart->chn; - int parity_error = 0; - int break_occured = 0; - int ch; - - if (uart->parerr_mark_flag == true) { - uart->parerr_mark_flag = false; - return 0; - } - - if (chn == SH4_SCI) { - if ((SCSSR1 & (SH7750_SCSSR1_PER | SH7750_SCSSR1_FER | - SH7750_SCSSR1_ORER)) != 0) { - if (SCSSR1 & (SH7750_SCSSR1_PER | SH7750_SCSSR1_FER)) - parity_error = 1; - sh4uart_handle_error(uart); - } - if ((SCSSR1 & SH7750_SCSSR1_RDRF) == 0) - return -1; - } else { - if ((SCSSR2 & (SH7750_SCSSR2_ER | SH7750_SCSSR2_DR | - SH7750_SCSSR2_BRK)) != 0 || - (SCLSR2 & SH7750_SCLSR2_ORER) != 0) { - if (SCSSR2 & (SH7750_SCSSR1_PER | SH7750_SCSSR1_FER)) - parity_error = 1; - if (SCSSR2 & SH7750_SCSSR2_BRK) - break_occured = 1; - sh4uart_handle_error(uart); - } - if ((SCSSR2 & SH7750_SCSSR2_RDF) == 0) - return -1; - } - - if (parity_error && !(uart->c_iflag & IGNPAR)) { - if (uart->c_iflag & PARMRK) { - uart->parerr_mark_flag = true; - return 0xff; - } else - return 0; - } - - if (break_occured && !(uart->c_iflag & BRKINT)) { - if (uart->c_iflag & IGNBRK) - return 0; - else - return 0; /* XXX -- SIGINT */ - } - - ch = SCRDR(chn); - - if (uart->chn == SH4_SCI) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr &= ~SH7750_SCSSR1_RDRF; - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr &= ~SH7750_SCSSR2_RDF; - } - - return ch; -} - -/* - * sh4uart_poll_write -- - * This function transmit buffer byte-by-byte in polling mode. - * - * PARAMETERS: - * uart - pointer to the UART descriptor structure - * buf - pointer to transmit buffer - * len - transmit buffer length - * - * RETURNS: - * 0 - */ -int -sh4uart_poll_write(sh4uart *uart, const char *buf, int len) -{ - volatile uint8_t *ssr1 = (volatile uint8_t *)SH7750_SCSSR1; - volatile uint16_t *ssr2 = (volatile uint16_t *)SH7750_SCSSR2; - - while (len) { - if (uart->chn == SH4_SCI) { - while ((SCSSR1 & SH7750_SCSSR1_TDRE) != 0) { - SCTDR1 = *buf++; - len--; - *ssr1 &= ~SH7750_SCSSR1_TDRE; - } - } else { - while ((SCSSR2 & SH7750_SCSSR2_TDFE) != 0) { - int i; - for (i = 0; - i < 16 - TRANSMIT_TRIGGER_VALUE(SCFCR2 & - SH7750_SCFCR2_TTRG); - i++) { - SCTDR2 = *buf++; - len--; - } - while ((SCSSR2 & SH7750_SCSSR2_TDFE) == 0 || - (SCSSR2 & SH7750_SCSSR2_TEND) == 0); - *ssr2 &= ~(SH7750_SCSSR1_TDRE | SH7750_SCSSR2_TEND); - } - } - } - return 0; -} - -/********************************** - * Functions to handle interrupts * - **********************************/ -/* sh4uart1_interrupt_receive -- - * UART interrupt handler routine -- SCI - * Receiving data - * - * PARAMETERS: - * vec - interrupt vector number - * - * RETURNS: - * none - */ -static rtems_isr -sh4uart1_interrupt_receive(rtems_vector_number vec) -{ - register int bp = 0; - char buf[32]; - volatile uint8_t *ssr1 = (volatile uint8_t *)SH7750_SCSSR1; - - - /* Find UART descriptor from vector number */ - sh4uart *uart = &sh4_uarts[0]; - - while (1) { - if ((bp < sizeof(buf) - 1) && ((SCSSR1 & SH7750_SCSSR1_RDRF) != 0)) { - /* Receive character and handle frame/parity errors */ - if ((SCSSR1 & (SH7750_SCSSR1_PER | SH7750_SCSSR1_FER | - SH7750_SCSSR1_ORER)) != 0) { - if (SCSSR1 & (SH7750_SCSSR1_PER | SH7750_SCSSR1_FER)) { - if (!(uart->c_iflag & IGNPAR)) { - if (uart->c_iflag & PARMRK) { - buf[bp++] = 0xff; - buf[bp++] = 0x00; - } else - buf[bp++] = 0x00; - } else - buf[bp++] = SCRDR1; - } - sh4uart_handle_error(uart); - } else - buf[bp++] = SCRDR1; - *ssr1 &= ~SH7750_SCSSR1_RDRF; - } else { - if (bp != 0) - rtems_termios_enqueue_raw_characters(uart->tty, buf, bp); - break; - } - } -} - -/* sh4uart2_interrupt_receive -- - * UART interrupt handler routine -- SCIF - * Receiving data - * - * PARAMETERS: - * vec - interrupt vector number - * - * RETURNS: - * none - */ -static rtems_isr -sh4uart2_interrupt_receive(rtems_vector_number vec) -{ - register int bp = 0; - char buf[32]; - volatile uint16_t *ssr2 = (volatile uint16_t *)SH7750_SCSSR2; - - - /* Find UART descriptor from vector number */ - sh4uart *uart = &sh4_uarts[1]; - - while (1) { - if ((bp < sizeof(buf) - 1) && ((SCSSR2 & SH7750_SCSSR2_RDF) != 0)) { - if ((SCSSR2 & (SH7750_SCSSR2_ER | SH7750_SCSSR2_DR | - SH7750_SCSSR2_BRK)) != 0 || - (SH7750_SCLSR2 & SH7750_SCLSR2_ORER) != 0) { - if (SCSSR2 & SH7750_SCSSR2_ER) { - if (!(uart->c_iflag & IGNPAR)) { - if (uart->c_iflag & PARMRK) { - buf[bp++] = 0xff; - buf[bp++] = 0x00; - } else - buf[bp++] = 0x00; - } else - buf[bp++] = SCRDR1; - } - - if (SCSSR2 & SH7750_SCSSR2_BRK) { - if (uart->c_iflag & IGNBRK) - buf[bp++] = 0x00; - else - buf[bp++] = 0x00; /* XXX -- SIGINT */ - } - - sh4uart_handle_error(uart); - } else - buf[bp++] = SCRDR1; - *ssr2 &= ~SH7750_SCSSR2_RDF; - } else { - if (bp != 0) - rtems_termios_enqueue_raw_characters(uart->tty, buf, bp); - break; - } - } -} - - -/* sh4uart1_interrupt_transmit -- - * UART interrupt handler routine -- SCI - * It continues transmit data when old part of data is transmitted - * - * PARAMETERS: - * vec - interrupt vector number - * - * RETURNS: - * none - */ -static rtems_isr -sh4uart1_interrupt_transmit(rtems_vector_number vec) -{ - volatile uint8_t *scr1 = (volatile uint8_t *)SH7750_SCSCR1; - volatile uint8_t *ssr1 = (volatile uint8_t *)SH7750_SCSSR1; - - /* Find UART descriptor from vector number */ - sh4uart *uart = &sh4_uarts[0]; - - if (uart->tx_buf != NULL && uart->tx_ptr < uart->tx_buf_len) { - while ((SCSSR1 & SH7750_SCSSR1_TDRE) != 0 && - uart->tx_ptr < uart->tx_buf_len) { - SCTDR1 = uart->tx_buf[uart->tx_ptr++]; - *ssr1 &= ~SH7750_SCSSR1_TDRE; - } - } else { - register int dequeue = uart->tx_buf_len; - - uart->tx_buf = NULL; - uart->tx_ptr = uart->tx_buf_len = 0; - - /* Disable interrupts while we do not have any data to transmit */ - *scr1 &= ~SH7750_SCSCR_TIE; - - rtems_termios_dequeue_characters(uart->tty, dequeue); - } -} - -/* sh4uart2_interrupt_transmit -- - * UART interrupt handler routine -- SCI - * It continues transmit data when old part of data is transmitted - * - * PARAMETERS: - * vec - interrupt vector number - * - * RETURNS: - * none - */ -static rtems_isr -sh4uart2_interrupt_transmit(rtems_vector_number vec) -{ - volatile uint8_t *ssr1 = (volatile uint8_t *)SH7750_SCSSR1; - volatile uint16_t *scr2 = (volatile uint16_t *)SH7750_SCSCR2; - - /* Find UART descriptor from vector number */ - sh4uart *uart = &sh4_uarts[1]; - - if (uart->tx_buf != NULL && uart->tx_ptr < uart->tx_buf_len) { - while ((SCSSR2 & SH7750_SCSSR2_TDFE) != 0) { - int i; - for (i = 0; - i < 16 - TRANSMIT_TRIGGER_VALUE(SCFCR2 & SH7750_SCFCR2_TTRG); - i++) - SCTDR2 = uart->tx_buf[uart->tx_ptr++]; - while ((SCSSR1 & SH7750_SCSSR1_TDRE) == 0 || - (SCSSR1 & SH7750_SCSSR1_TEND) == 0); - *ssr1 &= ~(SH7750_SCSSR1_TDRE | SH7750_SCSSR2_TEND); - } - } else { - register int dequeue = uart->tx_buf_len; - - uart->tx_buf = NULL; - uart->tx_ptr = uart->tx_buf_len = 0; - - /* Disable interrupts while we do not have any data to transmit */ - *scr2 &= ~SH7750_SCSCR_TIE; - - rtems_termios_dequeue_characters(uart->tty, dequeue); - } -} - -/* sh4uart_interrupt_write -- - * This function initiate transmitting of the buffer in interrupt mode. - * - * PARAMETERS: - * uart - pointer to the UART descriptor structure - * buf - pointer to transmit buffer - * len - transmit buffer length - * - * RETURNS: - * 0 - */ -rtems_status_code -sh4uart_interrupt_write(sh4uart *uart, const char *buf, int len) -{ - if (len > 0) { - volatile uint8_t *scr1 = (volatile uint8_t *)SH7750_SCSCR1; - volatile uint16_t *scr2 = (volatile uint16_t *)SH7750_SCSCR2; - - while ((SCSSR1 & SH7750_SCSSR1_TEND) == 0); - - uart->tx_buf = buf; - uart->tx_buf_len = len; - uart->tx_ptr = 0; - - if (uart->chn == SH4_SCI) - *scr1 |= SH7750_SCSCR_TIE; - else - *scr2 |= SH7750_SCSCR_TIE; - } - - return RTEMS_SUCCESSFUL; -} - -/* sh4uart_stop_remote_tx -- - * This function stop data flow from remote device. - * - * PARAMETERS: - * uart - pointer to the UART descriptor structure - * - * RETURNS: - * RTEMS_SUCCESSFUL - */ -rtems_status_code -sh4uart_stop_remote_tx(sh4uart *uart) -{ - if ( uart->chn == 1 ) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr &= ~(SH7750_SCSCR_RIE | SH7750_SCSCR_RE); - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr &= ~(SH7750_SCSCR_RIE | SH7750_SCSCR_RE); - } - - return RTEMS_SUCCESSFUL; -} - -/* sh4uart_start_remote_tx -- - * This function resume data flow from remote device. - * - * PARAMETERS: - * uart - pointer to the UART descriptor structure - * - * RETURNS: - * RTEMS_SUCCESSFUL - */ -rtems_status_code -sh4uart_start_remote_tx(sh4uart *uart) -{ - if ( uart->chn == 1 ) { - volatile uint8_t *scr = (volatile uint8_t *)SH7750_SCSCR1; - *scr |= SH7750_SCSCR_RIE | SH7750_SCSCR_RE; - } else { - volatile uint16_t *scr = (volatile uint16_t *)SH7750_SCSCR2; - *scr |= SH7750_SCSCR_RIE | SH7750_SCSCR_RE; - } - - return RTEMS_SUCCESSFUL; -} - -#ifdef SH4_WITH_IPL -/********************************* - * Functions for SH-IPL gdb stub * - *********************************/ - -/* - * ipl_finish -- - * Says gdb that program finished to get out from it. - */ -extern void ipl_finish(void); -__asm__ ( -" .global _ipl_finish\n" -"_ipl_finish:\n" -" mov.l __ipl_finish_value, r0\n" -" trapa #0x3f\n" -" nop\n" -" rts\n" -" nop\n" -" .align 4\n" -"__ipl_finish_value:\n" -" .long 255" -); - -extern int ipl_serial_input(int poll_count); -__asm__ ( -" .global _ipl_serial_input\n" -"_ipl_serial_input:\n" -" mov #1,r0\n" -" trapa #0x3f\n" -" nop\n" -" rts\n" -" nop\n"); - -extern void ipl_serial_output(const char *buf, int len); -__asm__ ( -" .global _ipl_serial_output\n" -"_ipl_serial_output:\n" -" mov #0,r0\n" -" trapa #0x3f\n" -" nop\n" -" rts\n" -" nop\n"); - -/* ipl_console_poll_read -- - * poll read operation for simulator console through ipl mechanism. - * - * PARAMETERS: - * minor - minor device number - * - * RETURNS: - * character code red from UART, or -1 if there is no characters - * available - */ -int -ipl_console_poll_read(int minor) -{ - unsigned char buf; - buf = ipl_serial_input(0x100000); - return buf; -} - -/* ipl_console_poll_write -- - * wrapper for polling mode write function - * - * PARAMETERS: - * minor - minor device number - * buf - output buffer - * len - output buffer length - * - * RETURNS: - * result code (0) - */ -int -ipl_console_poll_write(int minor, const char *buf, int len) -{ - int c; - while (len > 0) { - c = (len < 64 ? len : 64); - ipl_serial_output(buf, c); - len -= c; - buf += c; - } - return 0; -} -#endif |