packages/devs/serial/arm/aeb/v2_0/src/aeb_serial.c

   1 //==========================================================================
   2 //
   3 //      io/serial/arm/aeb_serial.c
   4 //
   5 //      ARM AEB-1 Serial I/O Interface Module (interrupt driven)
   6 //
   7 //==========================================================================
   8 //####ECOSGPLCOPYRIGHTBEGIN####
   9 // -------------------------------------------
  10 // This file is part of eCos, the Embedded Configurable Operating System.
  11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.
  12 //
  13 // eCos is free software; you can redistribute it and/or modify it under
  14 // the terms of the GNU General Public License as published by the Free
  15 // Software Foundation; either version 2 or (at your option) any later version.
  16 //
  17 // eCos is distributed in the hope that it will be useful, but WITHOUT ANY
  18 // WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20 // for more details.
  21 //
  22 // You should have received a copy of the GNU General Public License along
  23 // with eCos; if not, write to the Free Software Foundation, Inc.,
  24 // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
  25 //
  26 // As a special exception, if other files instantiate templates or use macros
  27 // or inline functions from this file, or you compile this file and link it
  28 // with other works to produce a work based on this file, this file does not
  29 // by itself cause the resulting work to be covered by the GNU General Public
  30 // License. However the source code for this file must still be made available
  31 // in accordance with section (3) of the GNU General Public License.
  32 //
  33 // This exception does not invalidate any other reasons why a work based on
  34 // this file might be covered by the GNU General Public License.
  35 //
  36 // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.
  37 // at http://sources.redhat.com/ecos/ecos-license/
  38 // -------------------------------------------
  39 //####ECOSGPLCOPYRIGHTEND####
  40 //==========================================================================
  41 //#####DESCRIPTIONBEGIN####
  42 //
  43 // Author(s):   gthomas
  44 // Contributors:  gthomas
  45 // Date:        1999-02-04
  46 // Purpose:     AEB-1 Serial I/O module (interrupt driven version)
  47 // Description:
  48 //
  49 //####DESCRIPTIONEND####
  50 //
  51 //==========================================================================
  52
  53 #include <pkgconf/system.h>
  54 #include <pkgconf/io_serial.h>
  55 #include <pkgconf/io.h>
  56 #include <cyg/io/io.h>
  57 #include <cyg/hal/hal_intr.h>
  58 #include <cyg/io/devtab.h>
  59 #include <cyg/io/serial.h>
  60 #include <cyg/infra/diag.h>
  61
  62 #ifdef CYGPKG_IO_SERIAL_ARM_AEB
  63
  64 #include "aeb_serial.h"
  65
  66 typedef struct aeb_serial_info {
  67     CYG_ADDRWORD   base;
  68     CYG_WORD       int_num;
  69     cyg_interrupt  serial_interrupt;
  70     cyg_handle_t   serial_interrupt_handle;
  71 } aeb_serial_info;
  72
  73 static bool aeb_serial_init(struct cyg_devtab_entry *tab);
  74 static bool aeb_serial_putc(serial_channel *chan, unsigned char c);
  75 static Cyg_ErrNo aeb_serial_lookup(struct cyg_devtab_entry **tab,
  76                                    struct cyg_devtab_entry *sub_tab,
  77                                    const char *name);
  78 static unsigned char aeb_serial_getc(serial_channel *chan);
  79 static Cyg_ErrNo aeb_serial_set_config(serial_channel *chan,
  80                                        cyg_uint32 key,
  81                                        const void *xbuf, cyg_uint32 *len);
  82 static void aeb_serial_start_xmit(serial_channel *chan);
  83 static void aeb_serial_stop_xmit(serial_channel *chan);
  84
  85 static cyg_uint32 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
  86 static void       aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
  87
  88 static SERIAL_FUNS(aeb_serial_funs,
  89                    aeb_serial_putc,
  90                    aeb_serial_getc,
  91                    aeb_serial_set_config,
  92                    aeb_serial_start_xmit,
  93                    aeb_serial_stop_xmit
  94     );
  95
  96 #ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0
  97 static aeb_serial_info aeb_serial_info0 = {0xFFFF0000,
  98                                            CYGNUM_HAL_INTERRUPT_UART0};
  99 #if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE > 0
 100 static unsigned char aeb_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];
 101 static unsigned char aeb_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BUFSIZE];
 102
 103 static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel0,
 104                                        aeb_serial_funs,
 105                                        aeb_serial_info0,
 106                                        CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),
 107                                        CYG_SERIAL_STOP_DEFAULT,
 108                                        CYG_SERIAL_PARITY_DEFAULT,
 109                                        CYG_SERIAL_WORD_LENGTH_DEFAULT,
 110                                        CYG_SERIAL_FLAGS_DEFAULT,
 111                                        &aeb_serial_out_buf0[0], sizeof(aeb_serial_out_buf0),
 112                                        &aeb_serial_in_buf0[0], sizeof(aeb_serial_in_buf0)
 113     );
 114 #else
 115 static SERIAL_CHANNEL(aeb_serial_channel0,
 116                       aeb_serial_funs,
 117                       aeb_serial_info0,
 118                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL0_BAUD),
 119                       CYG_SERIAL_STOP_DEFAULT,
 120                       CYG_SERIAL_PARITY_DEFAULT,
 121                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
 122                       CYG_SERIAL_FLAGS_DEFAULT
 123     );
 124 #endif
 125
 126 DEVTAB_ENTRY(aeb_serial_io0,
 127              CYGDAT_IO_SERIAL_ARM_AEB_SERIAL0_NAME,
 128              0,                     // Does not depend on a lower level interface
 129              &cyg_io_serial_devio,
 130              aeb_serial_init,
 131              aeb_serial_lookup,     // Serial driver may need initializing
 132              &aeb_serial_channel0
 133     );
 134 #endif //  CYGPKG_IO_SERIAL_ARM_AEB_SERIAL0
 135
 136 #ifdef CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1
 137 static aeb_serial_info aeb_serial_info1 = {0xFFFF0400,
 138                                            CYGNUM_HAL_INTERRUPT_UART1};
 139 #if CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE > 0
 140 static unsigned char aeb_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];
 141 static unsigned char aeb_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BUFSIZE];
 142
 143 static SERIAL_CHANNEL_USING_INTERRUPTS(aeb_serial_channel1,
 144                                        aeb_serial_funs,
 145                                        aeb_serial_info1,
 146                                        CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),
 147                                        CYG_SERIAL_STOP_DEFAULT,
 148                                        CYG_SERIAL_PARITY_DEFAULT,
 149                                        CYG_SERIAL_WORD_LENGTH_DEFAULT,
 150                                        CYG_SERIAL_FLAGS_DEFAULT,
 151                                        &aeb_serial_out_buf1[0], sizeof(aeb_serial_out_buf1),
 152                                        &aeb_serial_in_buf1[0], sizeof(aeb_serial_in_buf1)
 153     );
 154 #else
 155 static SERIAL_CHANNEL(aeb_serial_channel1,
 156                       aeb_serial_funs,
 157                       aeb_serial_info1,
 158                       CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_AEB_SERIAL1_BAUD),
 159                       CYG_SERIAL_STOP_DEFAULT,
 160                       CYG_SERIAL_PARITY_DEFAULT,
 161                       CYG_SERIAL_WORD_LENGTH_DEFAULT,
 162                       CYG_SERIAL_FLAGS_DEFAULT
 163     );
 164 #endif
 165
 166 DEVTAB_ENTRY(aeb_serial_io1,
 167              CYGDAT_IO_SERIAL_ARM_AEB_SERIAL1_NAME,
 168              0,                     // Does not depend on a lower level interface
 169              &cyg_io_serial_devio,
 170              aeb_serial_init,
 171              aeb_serial_lookup,     // Serial driver may need initializing
 172              &aeb_serial_channel1
 173     );
 174 #endif //  CYGPKG_IO_SERIAL_ARM_AEB_SERIAL1
 175
 176 // Internal function to actually configure the hardware to desired baud rate, etc.
 177 static bool
 178 aeb_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
 179 {
 180     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 181     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 182     unsigned short baud_divisor = select_baud[new_config->baud];
 183     unsigned char _lcr, _ier;
 184     if (baud_divisor == 0) return false;
 185     _ier = port->REG_IER;
 186     port->REG_IER = 0;  // Disable port interrupts while changing hardware
 187     _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] |
 188         select_stop_bits[new_config->stop] |
 189         select_parity[new_config->parity];
 190     port->REG_LCR = _lcr;
 191     port->REG_LCR |= LCR_DL;
 192     port->REG_MDL = baud_divisor >> 8;
 193     port->REG_LDL = baud_divisor & 0xFF;
 194     port->REG_LCR &= ~LCR_DL;
 195     if (init) {
 196         port->REG_FCR = 0x07;  // Enable and clear FIFO
 197         if (chan->out_cbuf.len != 0) {
 198             port->REG_IER = IER_RCV;
 199         } else {
 200             port->REG_IER = 0;
 201         }
 202         port->REG_MCR = MCR_INT|MCR_DTR|MCR_RTS;  // Master interrupt enable
 203     } else {
 204         port->REG_IER = _ier;
 205     }
 206     if (new_config != &chan->config) {
 207         chan->config = *new_config;
 208     }
 209     return true;
 210 }
 211
 212 // Function to initialize the device.  Called at bootstrap time.
 213 static bool
 214 aeb_serial_init(struct cyg_devtab_entry *tab)
 215 {
 216     serial_channel *chan = (serial_channel *)tab->priv;
 217     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 218 #ifdef CYGDBG_IO_INIT
 219     diag_printf("AEB SERIAL init - dev: %x.%d\n", aeb_chan->base, aeb_chan->int_num);
 220 #endif
 221     (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
 222     if (chan->out_cbuf.len != 0) {
 223         cyg_drv_interrupt_create(aeb_chan->int_num,
 224                                  99,                     // Priority - unused
 225                                  (cyg_addrword_t)chan,   //  Data item passed to interrupt handler
 226                                  aeb_serial_ISR,
 227                                  aeb_serial_DSR,
 228                                  &aeb_chan->serial_interrupt_handle,
 229                                  &aeb_chan->serial_interrupt);
 230         cyg_drv_interrupt_attach(aeb_chan->serial_interrupt_handle);
 231         cyg_drv_interrupt_unmask(aeb_chan->int_num);
 232     }
 233     aeb_serial_config_port(chan, &chan->config, true);
 234     return true;
 235 }
 236
 237 // This routine is called when the device is "looked" up (i.e. attached)
 238 static Cyg_ErrNo
 239 aeb_serial_lookup(struct cyg_devtab_entry **tab,
 240                   struct cyg_devtab_entry *sub_tab,
 241                   const char *name)
 242 {
 243     serial_channel *chan = (serial_channel *)(*tab)->priv;
 244     (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
 245     return ENOERR;
 246 }
 247
 248 // Send a character to the device output buffer.
 249 // Return 'true' if character is sent to device
 250 static bool
 251 aeb_serial_putc(serial_channel *chan, unsigned char c)
 252 {
 253     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 254     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 255     if (port->REG_LSR & LSR_THE) {
 256 // Transmit buffer is empty
 257         port->REG_THR = c;
 258         return true;
 259     } else {
 260 // No space
 261         return false;
 262     }
 263 }
 264
 265 // Fetch a character from the device input buffer, waiting if necessary
 266 static unsigned char
 267 aeb_serial_getc(serial_channel *chan)
 268 {
 269     unsigned char c;
 270     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 271     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 272     while ((port->REG_LSR & LSR_RSR) == 0) ;   // Wait for char
 273     c = port->REG_RHR;
 274     return c;
 275 }
 276
 277 // Set up the device characteristics; baud rate, etc.
 278 static Cyg_ErrNo
 279 aeb_serial_set_config(serial_channel *chan, cyg_uint32 key,
 280                       const void *xbuf, cyg_uint32 *len)
 281 {
 282     switch (key) {
 283     case CYG_IO_SET_CONFIG_SERIAL_INFO:
 284       {
 285         cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
 286         if ( *len < sizeof(cyg_serial_info_t) ) {
 287             return -EINVAL;
 288         }
 289         *len = sizeof(cyg_serial_info_t);
 290         if ( true != aeb_serial_config_port(chan, config, false) )
 291             return -EINVAL;
 292       }
 293       break;
 294     default:
 295         return -EINVAL;
 296     }
 297     return ENOERR;
 298 }
 299
 300 // Enable the transmitter on the device
 301 static void
 302 aeb_serial_start_xmit(serial_channel *chan)
 303 {
 304     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 305     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 306     port->REG_IER |= IER_XMT;  // Enable xmit interrupt
 307 }
 308
 309 // Disable the transmitter on the device
 310 static void
 311 aeb_serial_stop_xmit(serial_channel *chan)
 312 {
 313     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 314     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 315     port->REG_IER &= ~IER_XMT;  // Disable xmit interrupt
 316 }
 317
 318 // Serial I/O - low level interrupt handler (ISR)
 319 static cyg_uint32
 320 aeb_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
 321 {
 322     serial_channel *chan = (serial_channel *)data;
 323     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 324     cyg_drv_interrupt_mask(aeb_chan->int_num);
 325     cyg_drv_interrupt_acknowledge(aeb_chan->int_num);
 326     return CYG_ISR_CALL_DSR;  // Cause DSR to be run
 327 }
 328
 329 // Serial I/O - high level interrupt handler (DSR)
 330 static void
 331 aeb_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
 332 {
 333     serial_channel *chan = (serial_channel *)data;
 334     aeb_serial_info *aeb_chan = (aeb_serial_info *)chan->dev_priv;
 335     volatile struct serial_port *port = (volatile struct serial_port *)aeb_chan->base;
 336     unsigned char isr;
 337     isr = port->REG_ISR & 0x0E;
 338     if (isr == ISR_Tx) {
 339         (chan->callbacks->xmt_char)(chan);
 340     } else if (isr == ISR_Rx) {
 341         (chan->callbacks->rcv_char)(chan, port->REG_RHR);
 342     }
 343     cyg_drv_interrupt_unmask(aeb_chan->int_num);
 344 }
 345 #endif