Mercurial > flash_v2
diff packages/devs/serial/arm/aeb/current/src/aeb_serial.c @ 82:6736c52df507 ecos-sw-2000-04-14
Merge from eCos master repository on 2000-04-14-13:35:46-BST
| author | jlarmour |
|---|---|
| date | Tue, 18 Apr 2000 21:51:55 +0000 |
| parents | |
| children | 6ed91473a1cd |
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new file mode 100644 --- /dev/null +++ b/packages/devs/serial/arm/aeb/current/src/aeb_serial.c @@ -0,0 +1,318 @@ +//========================================================================== +// +// io/serial/arm/aeb_serial.c +// +// ARM AEB-1 Serial I/O Interface Module (interrupt driven) +// +//========================================================================== +//####COPYRIGHTBEGIN#### +// +// ------------------------------------------- +// The contents of this file are subject to the Red Hat eCos Public License +// Version 1.1 (the "License"); you may not use this file except in +// compliance with the License. You may obtain a copy of the License at +// http://www.redhat.com/ +// +// Software distributed under the License is distributed on an "AS IS" +// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the +// License for the specific language governing rights and limitations under +// the License. +// +// The Original Code is eCos - Embedded Configurable Operating System, +// released September 30, 1998. +// +// The Initial Developer of the Original Code is Red Hat. +// Portions created by Red Hat are +// Copyright (C) 1998, 1999, 2000 Red Hat, Inc. +// All Rights Reserved. +// ------------------------------------------- +// +//####COPYRIGHTEND#### +//========================================================================== +//#####DESCRIPTIONBEGIN#### +// +// Author(s): gthomas +// Contributors: gthomas +// Date: 1999-02-04 +// Purpose: AEB-1 Serial I/O module (interrupt driven version) +// Description: +// +//####DESCRIPTIONEND#### +// +//========================================================================== + +#include <pkgconf/system.h> +#include <pkgconf/io_serial.h> +#include <pkgconf/io.h> +#include <cyg/io/io.h> +#include <cyg/hal/hal_intr.h> +#include <cyg/io/devtab.h> +#include <cyg/io/serial.h> +#include <cyg/infra/diag.h> + +#ifdef CYGPKG_IO_SERIAL_ARM_AEB + +#include "aeb_serial.h" + +typedef struct aeb_serial_info { + CYG_ADDRWORD base; + CYG_WORD int_num; + cyg_interrupt serial_interrupt; + cyg_handle_t serial_interrupt_handle; +} aeb_serial_info; + +static bool aeb_serial_init(struct cyg_devtab_entry *tab); +static bool aeb_serial_putc(serial_channel *chan, unsigned char c); +static Cyg_ErrNo aeb_serial_lookup(struct cyg_devtab_entry **tab, + struct cyg_devtab_entry *sub_tab, + const char *name); +static unsigned char aeb_serial_getc(serial_channel *chan); +static bool aeb_serial_set_config(serial_channel *chan, cyg_serial_info_t *config); +static void aeb_serial_start_xmit(serial_channel *chan); +static void aeb_serial_stop_xmit(serial_channel *chan); + +static cyg_uint32 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data); +static void aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data); + +static SERIAL_FUNS(aeb_serial_funs, + aeb_serial_putc, + aeb_serial_getc, + aeb_serial_set_config, + aeb_serial_start_xmit, + aeb_serial_stop_xmit + ); + +#ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0 +static aeb_serial_info aeb_serial_info0 = {0xFFFF0000, + CYGNUM_HAL_INTERRUPT_UART0}; +#if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE > 0 +static unsigned char aeb_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE]; +static unsigned char aeb_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE]; + +static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel0, + aeb_serial_funs, + aeb_serial_info0, + CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD), + CYG_SERIAL_STOP_DEFAULT, + CYG_SERIAL_PARITY_DEFAULT, + CYG_SERIAL_WORD_LENGTH_DEFAULT, + CYG_SERIAL_FLAGS_DEFAULT, + &aeb_serial_out_buf0[0], sizeof(aeb_serial_out_buf0), + &aeb_serial_in_buf0[0], sizeof(aeb_serial_in_buf0) + ); +#else +static SERIAL_CHANNEL(aeb_serial_channel0, + aeb_serial_funs, + aeb_serial_info0, + CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD), + CYG_SERIAL_STOP_DEFAULT, + CYG_SERIAL_PARITY_DEFAULT, + CYG_SERIAL_WORD_LENGTH_DEFAULT, + CYG_SERIAL_FLAGS_DEFAULT + ); +#endif + +DEVTAB_ENTRY(aeb_serial_io0, + CYGDAT_IO_SERIAL_ARM_AEB_SERIAL0_NAME, + 0, // Does not depend on a lower level interface + &cyg_io_serial_devio, + aeb_serial_init, + aeb_serial_lookup, // Serial driver may need initializing + &aeb_serial_channel0 + ); +#endif // CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0 + +#ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1 +static aeb_serial_info aeb_serial_info1 = {0xFFFF0400, + CYGNUM_HAL_INTERRUPT_UART1}; +#if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE > 0 +static unsigned char aeb_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE]; +static unsigned char aeb_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE]; + +static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel1, + aeb_serial_funs, + aeb_serial_info1, + CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD), + CYG_SERIAL_STOP_DEFAULT, + CYG_SERIAL_PARITY_DEFAULT, + CYG_SERIAL_WORD_LENGTH_DEFAULT, + CYG_SERIAL_FLAGS_DEFAULT, + &aeb_serial_out_buf1[0], sizeof(aeb_serial_out_buf1), + &aeb_serial_in_buf1[0], sizeof(aeb_serial_in_buf1) + ); +#else +static SERIAL_CHANNEL(aeb_serial_channel1, + aeb_serial_funs, + aeb_serial_info1, + CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD), + CYG_SERIAL_STOP_DEFAULT, + CYG_SERIAL_PARITY_DEFAULT, + CYG_SERIAL_WORD_LENGTH_DEFAULT, + CYG_SERIAL_FLAGS_DEFAULT + ); +#endif + +DEVTAB_ENTRY(aeb_serial_io1, + CYGDAT_IO_SERIAL_ARM_AEB_SERIAL1_NAME, + 0, // Does not depend on a lower level interface + &cyg_io_serial_devio, + aeb_serial_init, + aeb_serial_lookup, // Serial driver may need initializing + &aeb_serial_channel1 + ); +#endif // CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1 + +// Internal function to actually configure the hardware to desired baud rate, etc. +static bool +aeb_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init) +{ + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + unsigned short baud_divisor = select_baud[new_config->baud]; + unsigned char _lcr, _ier; + if (baud_divisor == 0) return false; + _ier = port->REG_IER; + port->REG_IER = 0; // Disable port interrupts while changing hardware + _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] | + select_stop_bits[new_config->stop] | + select_parity[new_config->parity]; + port->REG_LCR = _lcr; + port->REG_LCR |= LCR_DL; + port->REG_MDL = baud_divisor >> 8; + port->REG_LDL = baud_divisor & 0xFF; + port->REG_LCR &= ~LCR_DL; + if (init) { + port->REG_FCR = 0x07; // Enable and clear FIFO + if (chan->out_cbuf.len != 0) { + port->REG_IER = IER_RCV; + } else { + port->REG_IER = 0; + } + port->REG_MCR = MCR_INT|MCR_DTR|MCR_RTS; // Master interrupt enable + } else { + port->REG_IER = _ier; + } + if (new_config != &chan->config) { + chan->config = *new_config; + } + return true; +} + +// Function to initialize the device. Called at bootstrap time. +static bool +aeb_serial_init(struct cyg_devtab_entry *tab) +{ + serial_channel *chan = (serial_channel *)tab->priv; + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; +#ifdef CYGDBG_IO_INIT + diag_printf("AEB SERIAL init - dev: %x.%d\n", aeb_chan->base, aeb_chan->int_num); +#endif + (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices + if (chan->out_cbuf.len != 0) { + cyg_drv_interrupt_create(aeb_chan->int_num, + 99, // Priority - unused + (cyg_addrword_t)chan, // Data item passed to interrupt handler + aeb_serial_ISR, + aeb_serial_DSR, + &aeb_chan->serial_interrupt_handle, + &aeb_chan->serial_interrupt); + cyg_drv_interrupt_attach(aeb_chan->serial_interrupt_handle); + cyg_drv_interrupt_unmask(aeb_chan->int_num); + } + aeb_serial_config_port(chan, &chan->config, true); + return true; +} + +// This routine is called when the device is "looked" up (i.e. attached) +static Cyg_ErrNo +aeb_serial_lookup(struct cyg_devtab_entry **tab, + struct cyg_devtab_entry *sub_tab, + const char *name) +{ + serial_channel *chan = (serial_channel *)(*tab)->priv; + (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices + return ENOERR; +} + +// Send a character to the device output buffer. +// Return 'true' if character is sent to device +static bool +aeb_serial_putc(serial_channel *chan, unsigned char c) +{ + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + if (port->REG_LSR & LSR_THE) { +// Transmit buffer is empty + port->REG_THR = c; + return true; + } else { +// No space + return false; + } +} + +// Fetch a character from the device input buffer, waiting if necessary +static unsigned char +aeb_serial_getc(serial_channel *chan) +{ + unsigned char c; + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + while ((port->REG_LSR & LSR_RSR) == 0) ; // Wait for char + c = port->REG_RHR; + return c; +} + +// Set up the device characteristics; baud rate, etc. +static bool +aeb_serial_set_config(serial_channel *chan, cyg_serial_info_t *config) +{ + return aeb_serial_config_port(chan, config, false); +} + +// Enable the transmitter on the device +static void +aeb_serial_start_xmit(serial_channel *chan) +{ + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + port->REG_IER |= IER_XMT; // Enable xmit interrupt +} + +// Disable the transmitter on the device +static void +aeb_serial_stop_xmit(serial_channel *chan) +{ + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + port->REG_IER &= ~IER_XMT; // Disable xmit interrupt +} + +// Serial I/O - low level interrupt handler (ISR) +static cyg_uint32 +aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data) +{ + serial_channel *chan = (serial_channel *)data; + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + cyg_drv_interrupt_mask(aeb_chan->int_num); + cyg_drv_interrupt_acknowledge(aeb_chan->int_num); + return CYG_ISR_CALL_DSR; // Cause DSR to be run +} + +// Serial I/O - high level interrupt handler (DSR) +static void +aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data) +{ + serial_channel *chan = (serial_channel *)data; + aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv; + volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base; + unsigned char isr; + isr = port->REG_ISR & 0x0E; + if (isr == ISR_Tx) { + (chan->callbacks->xmt_char)(chan); + } else if (isr == ISR_Rx) { + (chan->callbacks->rcv_char)(chan, port->REG_RHR); + } + cyg_drv_interrupt_unmask(aeb_chan->int_num); +} +#endif
