diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/console/uart.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/console/uart.c | 781 |
1 files changed, 0 insertions, 781 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/console/uart.c b/c/src/lib/libbsp/powerpc/shared/console/uart.c deleted file mode 100644 index 62212b98db..0000000000 --- a/c/src/lib/libbsp/powerpc/shared/console/uart.c +++ /dev/null @@ -1,781 +0,0 @@ -/* - * This software is Copyright (C) 1998 by T.sqware - all rights limited - * It is provided in to the public domain "as is", can be freely modified - * as far as this copyight notice is kept unchanged, but does not imply - * an endorsement by T.sqware of the product in which it is included. - */ - -#include <stdint.h> -#include <stdio.h> -#include <bsp.h> -#include <bsp/irq.h> -#include <bsp/uart.h> -#include <rtems/libio.h> -#include <rtems/bspIo.h> -#include <rtems/termiostypes.h> -#include <termios.h> -#include <assert.h> - -/* - * Basic 16552 driver - */ - -struct uart_data -{ - unsigned long ioBase; - int irq; - int hwFlow; - int baud; - BSP_UartBreakCbRec breakCallback; - int ioMode; -}; - -/* - * Initialization of BSP specific data. - * The constants are pulled in from a BSP - * specific file, whereas all of the code - * in this file is generic and makes no - * assumptions about addresses, irq vectors - * etc... - */ - -#define UART_UNSUPP ((unsigned long)(-1)) - -static struct uart_data uart_data[2] = { - { -#ifdef BSP_UART_IOBASE_COM1 - BSP_UART_IOBASE_COM1, - BSP_UART_COM1_IRQ, -#else - UART_UNSUPP, - -1, -#endif - }, - { -#ifdef BSP_UART_IOBASE_COM2 - BSP_UART_IOBASE_COM2, - BSP_UART_COM2_IRQ, -#else - UART_UNSUPP, - -1, -#endif - }, -}; - -#define MAX_UARTS (sizeof(uart_data)/sizeof(uart_data[0])) -#define SANITY_CHECK(uart) \ - assert( MAX_UARTS > (unsigned)(uart) && uart_data[(uart)].ioBase != UART_UNSUPP ) -/* - * Macros to read/write register of uart, if configuration is - * different just rewrite these macros - */ - -static inline unsigned char -uread(int uart, unsigned int reg) -{ - return in_8((uint8_t*)(uart_data[uart].ioBase + reg)); -} - -static inline void -uwrite(int uart, int reg, unsigned int val) -{ - out_8((uint8_t*)(uart_data[uart].ioBase + reg), val); -} - - -static void -uartError(int uart, void *termiosPrivate) -{ - unsigned char uartStatus, dummy; - BSP_UartBreakCbProc h; - - uartStatus = uread(uart, LSR); - dummy = uread(uart, RBR); - -#ifdef UARTDEBUG - if (uartStatus & OE) - printk("********* Over run Error **********\n"); - if (uartStatus & PE) - printk("********* Parity Error **********\n"); - if (uartStatus & FE) - printk("********* Framing Error **********\n"); - if (uartStatus & BI) { - printk("********* BREAK INTERRUPT *********\n"); -#endif - if ((h=uart_data[uart].breakCallback.handler)) { - h(uart, - (dummy<<8)|uartStatus, - termiosPrivate, - uart_data[uart].breakCallback.private); - } -#ifdef UARTDEBUG - if (uartStatus & ERFIFO) - printk("********* Error receive Fifo **********\n"); -#endif -} - -/* - * Uart initialization, it is hardcoded to 8 bit, no parity, - * one stop bit, FIFO, things to be changed - * are baud rate and nad hw flow control, - * and longest rx fifo setting - */ -void -BSP_uart_init(int uart, int baud, int hwFlow) -{ - unsigned char tmp; - - /* Sanity check */ - SANITY_CHECK(uart); - - /* Make sure any printk activity drains before - * re-initializing. - */ - while ( ! (uread(uart, LSR) & TEMT) ) - ; - - switch(baud) - { - case 50: - case 75: - case 110: - case 134: - case 300: - case 600: - case 1200: - case 2400: - case 9600: - case 19200: - case 38400: - case 57600: - case 115200: - break; - default: - assert(0); - return; - } - - /* Set DLAB bit to 1 */ - uwrite(uart, LCR, DLAB); - - if ( (int)BSPBaseBaud <= 0 ) { - /* Use current divisor assuming BSPBaseBaud gives us the current speed */ - BSPBaseBaud = BSPBaseBaud ? -BSPBaseBaud : 9600; - BSPBaseBaud *= ((uread(uart, DLM) << 8) | uread(uart, DLL)); - } - - /* Set baud rate */ - uwrite(uart, DLL, (BSPBaseBaud/baud) & 0xff); - uwrite(uart, DLM, ((BSPBaseBaud/baud) >> 8) & 0xff); - - /* 8-bit, no parity , 1 stop */ - uwrite(uart, LCR, CHR_8_BITS); - - /* Set DTR, RTS and OUT2 high */ - uwrite(uart, MCR, DTR | RTS | OUT_2); - - /* Enable FIFO */ - uwrite(uart, FCR, FIFO_EN | XMIT_RESET | RCV_RESET | RECEIVE_FIFO_TRIGGER12); - - /* Disable Interrupts */ - uwrite(uart, IER, 0); - - /* Read status to clear them */ - tmp = uread(uart, LSR); - tmp = uread(uart, RBR); - tmp = uread(uart, MSR); - (void) tmp; /* avoid set but not used warning */ - - /* Remember state */ - uart_data[uart].hwFlow = hwFlow; - uart_data[uart].baud = baud; - return; -} - -/* - * Set baud - */ -void -BSP_uart_set_baud(int uart, int baud) -{ - unsigned char mcr, ier; - - /* Sanity check */ - SANITY_CHECK(uart); - - /* - * This function may be called whenever TERMIOS parameters - * are changed, so we have to make sure that baud change is - * indeed required. - */ - - if(baud == uart_data[uart].baud) - { - return; - } - - mcr = uread(uart, MCR); - ier = uread(uart, IER); - - BSP_uart_init(uart, baud, uart_data[uart].hwFlow); - - uwrite(uart, MCR, mcr); - uwrite(uart, IER, ier); - - return; -} - -/* - * Enable/disable interrupts - */ -void -BSP_uart_intr_ctrl(int uart, int cmd) -{ - - SANITY_CHECK(uart); - - switch(cmd) - { - case BSP_UART_INTR_CTRL_DISABLE: - uwrite(uart, IER, INTERRUPT_DISABLE); - break; - case BSP_UART_INTR_CTRL_ENABLE: - if(uart_data[uart].hwFlow) - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - TRANSMIT_ENABLE | - RECEIVER_LINE_ST_ENABLE | - MODEM_ENABLE - ) - ); - } - else - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - TRANSMIT_ENABLE | - RECEIVER_LINE_ST_ENABLE - ) - ); - } - break; - case BSP_UART_INTR_CTRL_TERMIOS: - if(uart_data[uart].hwFlow) - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - RECEIVER_LINE_ST_ENABLE | - MODEM_ENABLE - ) - ); - } - else - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - RECEIVER_LINE_ST_ENABLE - ) - ); - } - break; - case BSP_UART_INTR_CTRL_GDB: - uwrite(uart, IER, RECEIVE_ENABLE); - break; - default: - assert(0); - break; - } - - return; -} - -void -BSP_uart_throttle(int uart) -{ - unsigned int mcr; - - SANITY_CHECK(uart); - - if(!uart_data[uart].hwFlow) - { - /* Should not happen */ - assert(0); - return; - } - mcr = uread (uart, MCR); - /* RTS down */ - mcr &= ~RTS; - uwrite(uart, MCR, mcr); - - return; -} - -void -BSP_uart_unthrottle(int uart) -{ - unsigned int mcr; - - SANITY_CHECK(uart); - - if(!uart_data[uart].hwFlow) - { - /* Should not happen */ - assert(0); - return; - } - mcr = uread (uart, MCR); - /* RTS up */ - mcr |= RTS; - uwrite(uart, MCR, mcr); - - return; -} - -/* - * Status function, -1 if error - * detected, 0 if no received chars available, - * 1 if received char available, 2 if break - * is detected, it will eat break and error - * chars. It ignores overruns - we cannot do - * anything about - it execpt count statistics - * and we are not counting it. - */ -int -BSP_uart_polled_status(int uart) -{ - unsigned char val; - - SANITY_CHECK(uart); - - val = uread(uart, LSR); - - if(val & BI) - { - /* BREAK found, eat character */ - uread(uart, RBR); - return BSP_UART_STATUS_BREAK; - } - - if((val & (DR | OE | FE)) == 1) - { - /* No error, character present */ - return BSP_UART_STATUS_CHAR; - } - - if((val & (DR | OE | FE)) == 0) - { - /* Nothing */ - return BSP_UART_STATUS_NOCHAR; - } - - /* - * Framing or parity error - * eat character - */ - uread(uart, RBR); - - return BSP_UART_STATUS_ERROR; -} - -/* - * Polled mode write function - */ -void -BSP_uart_polled_write(int uart, int val) -{ - unsigned char val1; - - /* Sanity check */ - SANITY_CHECK(uart); - - for(;;) - { - if((val1=uread(uart, LSR)) & THRE) - { - break; - } - } - - if(uart_data[uart].hwFlow) - { - for(;;) - { - if(uread(uart, MSR) & CTS) - { - break; - } - } - } - - uwrite(uart, THR, val & 0xff); - - return; -} - -void -BSP_output_char_via_serial(const char val) -{ - BSP_uart_polled_write(BSPConsolePort, val); -} - -/* - * Polled mode read function - */ -int -BSP_uart_polled_read(int uart) -{ - unsigned char val; - - SANITY_CHECK(uart); - - for(;;) - { - if(uread(uart, LSR) & DR) - { - break; - } - } - - val = uread(uart, RBR); - - return (int)(val & 0xff); -} - -unsigned -BSP_poll_char_via_serial() -{ - return BSP_uart_polled_read(BSPConsolePort); -} - -static void -uart_noop(const rtems_irq_connect_data *unused) -{ - return; -} - -/* note that the IRQ names contain _ISA_ for legacy - * reasons. They can be any interrupt, depending - * on the particular BSP... - */ - -static int -uart_isr_is_on(const rtems_irq_connect_data *irq) -{ - int uart; - - uart = (irq->name == BSP_UART_COM1_IRQ) ? - BSP_UART_COM1 : BSP_UART_COM2; - - return uread(uart,IER); -} - -static int -doit(int uart, rtems_irq_hdl handler, int (*p)(const rtems_irq_connect_data*)) -{ - rtems_irq_connect_data d={0}; - d.name = uart_data[uart].irq; - d.off = d.on = uart_noop; - d.isOn = uart_isr_is_on; - d.hdl = handler; - return p(&d); -} - -int -BSP_uart_install_isr(int uart, rtems_irq_hdl handler) -{ -/* Using shared interrupts by default might break things.. the - * shared IRQ installer uses malloc() and if a BSP had called this - * during early init it might not work... - */ -#ifdef BSP_UART_USE_SHARED_IRQS - return doit(uart, handler, BSP_install_rtems_shared_irq_handler); -#else - return doit(uart, handler, BSP_install_rtems_irq_handler); -#endif -} - -int -BSP_uart_remove_isr(int uart, rtems_irq_hdl handler) -{ - return doit(uart, handler, BSP_remove_rtems_irq_handler); -} - -/* ================ Termios support =================*/ - -static volatile int termios_stopped_com[2] = {0,0}; -static volatile int termios_tx_active_com[2] = {0,0}; -static void* termios_ttyp_com[2] = {NULL,NULL}; -static char termios_tx_hold_com[2] = {0,0}; -static volatile char termios_tx_hold_valid_com[2] = {0,0}; - -/* - * Set channel parameters - */ -void -BSP_uart_termios_set(int uart, void *p) -{ - struct rtems_termios_tty *ttyp = p; - unsigned char val; - SANITY_CHECK(uart); - - if(uart_data[uart].hwFlow) - { - val = uread(uart, MSR); - - termios_stopped_com[uart] = (val & CTS) ? 0 : 1; - } - else - { - termios_stopped_com[uart] = 0; - } - termios_tx_active_com[uart] = 0; - termios_ttyp_com[uart] = ttyp; - termios_tx_hold_com[uart] = 0; - termios_tx_hold_valid_com[uart] = 0; - - uart_data[uart].ioMode = ttyp->device.outputUsesInterrupts; - - return; -} - -ssize_t -BSP_uart_termios_write_polled(int minor, const char *buf, size_t len) -{ - int uart=minor; /* could differ, theoretically */ - int nwrite; - const char *b = buf; - - for (nwrite=0 ; nwrite < len ; nwrite++) { - BSP_uart_polled_write(uart, *b++); - } - return nwrite; -} - -ssize_t -BSP_uart_termios_write_com(int minor, const char *buf, size_t len) -{ - int uart=minor; /* could differ, theoretically */ - - if(len <= 0) - { - return 0; - } - - /* If the TX buffer is busy - something is royally screwed up */ - /* assert((uread(BSP_UART_COM1, LSR) & THRE) != 0); */ - - if(termios_stopped_com[uart]) - { - /* CTS low */ - termios_tx_hold_com[uart] = *buf; - termios_tx_hold_valid_com[uart] = 1; - return 0; - } - - /* Write character */ - uwrite(uart, THR, *buf & 0xff); - - /* Enable interrupts if necessary */ - if(!termios_tx_active_com[uart] && uart_data[uart].hwFlow) - { - termios_tx_active_com[uart] = 1; - uwrite(uart, IER, - (RECEIVE_ENABLE | - TRANSMIT_ENABLE | - RECEIVER_LINE_ST_ENABLE | - MODEM_ENABLE - ) - ); - } - else if(!termios_tx_active_com[uart]) - { - termios_tx_active_com[uart] = 1; - uwrite(uart, IER, - (RECEIVE_ENABLE | - TRANSMIT_ENABLE | - RECEIVER_LINE_ST_ENABLE - ) - ); - } - - return 0; -} - -int -BSP_uart_termios_read_com(int uart) -{ - int off = (int)0; - char buf[40]; - rtems_interrupt_level l; - - /* read bytes */ - while (( off < sizeof(buf) ) && ( uread(uart, LSR) & DR )) { - buf[off++] = uread(uart, RBR); - } - - /* write out data */ - if ( off > 0 ) { - rtems_termios_enqueue_raw_characters(termios_ttyp_com[uart], buf, off); - } - - /* enable receive interrupts */ - rtems_interrupt_disable(l); - uwrite(uart, IER, uread(uart, IER) | (RECEIVE_ENABLE | RECEIVER_LINE_ST_ENABLE)); - rtems_interrupt_enable(l); - - return ( EOF ); -} - -static void -BSP_uart_termios_isr_com(int uart) -{ - unsigned char buf[40]; - unsigned char val, ier; - int off, ret, vect; - - off = 0; - - for(;;) - { - vect = uread(uart, IIR) & 0xf; - - switch(vect) - { - case MODEM_STATUS : - val = uread(uart, MSR); - if(uart_data[uart].hwFlow) - { - if(val & CTS) - { - /* CTS high */ - termios_stopped_com[uart] = 0; - if(termios_tx_hold_valid_com[uart]) - { - termios_tx_hold_valid_com[uart] = 0; - BSP_uart_termios_write_com(uart, &termios_tx_hold_com[uart], - 1); - } - } - else - { - /* CTS low */ - termios_stopped_com[uart] = 1; - } - } - break; - case NO_MORE_INTR : - /* No more interrupts */ - if(off != 0) - { - /* Update rx buffer */ - rtems_termios_enqueue_raw_characters(termios_ttyp_com[uart], - (char *)buf, - off); - } - return; - case TRANSMITTER_HODING_REGISTER_EMPTY : - /* - * TX holding empty: we have to disable these interrupts - * if there is nothing more to send. - */ - - ret = rtems_termios_dequeue_characters(termios_ttyp_com[uart], 1); - - /* If nothing else to send disable interrupts */ - if(ret == 0 && uart_data[uart].hwFlow) - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - RECEIVER_LINE_ST_ENABLE | - MODEM_ENABLE - ) - ); - termios_tx_active_com[uart] = 0; - } - else if(ret == 0) - { - uwrite(uart, IER, - (RECEIVE_ENABLE | - RECEIVER_LINE_ST_ENABLE - ) - ); - termios_tx_active_com[uart] = 0; - } - break; - case RECEIVER_DATA_AVAIL : - case CHARACTER_TIMEOUT_INDICATION: - if ( uart_data[uart].ioMode == TERMIOS_TASK_DRIVEN ) - { - /* ensure interrupts are enabled */ - if ( (ier = uread(uart,IER)) & RECEIVE_ENABLE ) - { - /* disable interrupts and notify termios */ - ier &= ~(RECEIVE_ENABLE | RECEIVER_LINE_ST_ENABLE); - uwrite(uart, IER, ier); - rtems_termios_rxirq_occured(termios_ttyp_com[uart]); - } - } - else - { - /* RX data ready */ - assert(off < sizeof(buf)); - while ( off < sizeof(buf) && ( DR & uread(uart, LSR) ) ) - buf[off++] = uread(uart, RBR); - } - break; - case RECEIVER_ERROR: - /* RX error: eat character */ - uartError(uart, termios_ttyp_com[uart]); - break; - default: - /* Should not happen */ - assert(0); - return; - } - } -} - -/* - * XXX - Note that this can now be one isr with the uart - * passed as the parameter. - */ -void -BSP_uart_termios_isr_com1(void *unused) -{ - BSP_uart_termios_isr_com(BSP_UART_COM1); -} - -void -BSP_uart_termios_isr_com2(void *unused) -{ - BSP_uart_termios_isr_com(BSP_UART_COM2); -} - -/* retrieve 'break' handler info */ -int -BSP_uart_get_break_cb(int uart, rtems_libio_ioctl_args_t *arg) -{ -BSP_UartBreakCb cb=arg->buffer; -unsigned long flags; - SANITY_CHECK(uart); - rtems_interrupt_disable(flags); - *cb = uart_data[uart].breakCallback; - rtems_interrupt_enable(flags); - arg->ioctl_return=0; - return RTEMS_SUCCESSFUL; -} - -/* install 'break' handler */ -int -BSP_uart_set_break_cb(int uart, rtems_libio_ioctl_args_t *arg) -{ -BSP_UartBreakCb cb=arg->buffer; -unsigned long flags; - SANITY_CHECK(uart); - rtems_interrupt_disable(flags); - uart_data[uart].breakCallback = *cb; - rtems_interrupt_enable(flags); - arg->ioctl_return=0; - return RTEMS_SUCCESSFUL; -} |