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annotate packages/devs/serial/arm/sa11x0/current/src/sa11x0_serial.c @ 2729:74dbf4c3f2e1 after-copyright-change-20090129

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Update all copyright banners to reflect FSF ownership; fix and improve licence text.
author jlarmour
date Thu, 29 Jan 2009 17:47:46 +0000
parents d2c90368aeef
children
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1 //==========================================================================
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2 //
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3 // io/serial/arm/sa11x0/sa11x0_serial.c
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4 //
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5 // StrongARM SA11x0 Serial I/O Interface Module (interrupt driven)
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6 //
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7 //==========================================================================
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8 // ####ECOSGPLCOPYRIGHTBEGIN####
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9 // -------------------------------------------
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10 // This file is part of eCos, the Embedded Configurable Operating System.
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11 // Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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12 //
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13 // eCos is free software; you can redistribute it and/or modify it under
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14 // the terms of the GNU General Public License as published by the Free
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15 // Software Foundation; either version 2 or (at your option) any later
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16 // version.
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17 //
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18 // eCos is distributed in the hope that it will be useful, but WITHOUT
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19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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21 // for more details.
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22 //
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23 // You should have received a copy of the GNU General Public License
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24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
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25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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26 //
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27 // As a special exception, if other files instantiate templates or use
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28 // macros or inline functions from this file, or you compile this file
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29 // and link it with other works to produce a work based on this file,
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30 // this file does not by itself cause the resulting work to be covered by
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31 // the GNU General Public License. However the source code for this file
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32 // must still be made available in accordance with section (3) of the GNU
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33 // General Public License v2.
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34 //
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35 // This exception does not invalidate any other reasons why a work based
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36 // on this file might be covered by the GNU General Public License.
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37 // -------------------------------------------
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38 // ####ECOSGPLCOPYRIGHTEND####
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39 //==========================================================================
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40 //#####DESCRIPTIONBEGIN####
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41 //
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42 // Author(s): gthomas
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43 // Contributors: gthomas
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44 // Date: 2000-05-08
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45 // Purpose: StrongARM SA11x0 Serial I/O module (interrupt driven version)
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46 // Description:
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47 //
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48 //####DESCRIPTIONEND####
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49 //
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50 //==========================================================================
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51
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52 #include <pkgconf/system.h>
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53 #include <pkgconf/io_serial.h>
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54 #include <pkgconf/io.h>
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55 #include <pkgconf/kernel.h>
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56
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57 #include <cyg/io/io.h>
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58 #include <cyg/hal/hal_intr.h>
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59 #include <cyg/io/devtab.h>
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60 #include <cyg/io/serial.h>
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61 #include <cyg/infra/diag.h>
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62
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63 #ifdef CYGPKG_IO_SERIAL_ARM_SA11X0
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64
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65 #include "sa11x0_serial.h"
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66
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67 typedef struct sa11x0_serial_info {
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68 CYG_ADDRWORD base;
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69 CYG_WORD int_num;
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70 cyg_interrupt serial_interrupt;
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71 cyg_handle_t serial_interrupt_handle;
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72 } sa11x0_serial_info;
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73
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74 static bool sa11x0_serial_init(struct cyg_devtab_entry *tab);
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75 static bool sa11x0_serial_putc(serial_channel *chan, unsigned char c);
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76 static Cyg_ErrNo sa11x0_serial_lookup(struct cyg_devtab_entry **tab,
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77 struct cyg_devtab_entry *sub_tab,
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78 const char *name);
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79 static unsigned char sa11x0_serial_getc(serial_channel *chan);
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80 static Cyg_ErrNo sa11x0_serial_set_config(serial_channel *chan, cyg_uint32 key,
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81 const void *xbuf, cyg_uint32 *len);
108
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82 static void sa11x0_serial_start_xmit(serial_channel *chan);
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83 static void sa11x0_serial_stop_xmit(serial_channel *chan);
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84
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85 static cyg_uint32 sa11x0_serial_ISR(cyg_vector_t vector, cyg_addrword_t data);
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86 static void sa11x0_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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87
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88 static SERIAL_FUNS(sa11x0_serial_funs,
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89 sa11x0_serial_putc,
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90 sa11x0_serial_getc,
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91 sa11x0_serial_set_config,
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92 sa11x0_serial_start_xmit,
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93 sa11x0_serial_stop_xmit
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94 );
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95
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96 #ifdef CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL0
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97 static sa11x0_serial_info sa11x0_serial_info0 = {(CYG_ADDRWORD)SA11X0_UART3_CONTROL0,
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98 CYGNUM_HAL_INTERRUPT_UART3};
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99 #if CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE > 0
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100 static unsigned char sa11x0_serial_out_buf0[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE];
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101 static unsigned char sa11x0_serial_in_buf0[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BUFSIZE];
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102
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103 static SERIAL_CHANNEL_USING_INTERRUPTS(sa11x0_serial_channel0,
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104 sa11x0_serial_funs,
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105 sa11x0_serial_info0,
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106 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BAUD),
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107 CYG_SERIAL_STOP_DEFAULT,
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108 CYG_SERIAL_PARITY_DEFAULT,
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109 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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110 CYG_SERIAL_FLAGS_DEFAULT,
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111 &sa11x0_serial_out_buf0[0], sizeof(sa11x0_serial_out_buf0),
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112 &sa11x0_serial_in_buf0[0], sizeof(sa11x0_serial_in_buf0)
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113 );
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114 #else
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115 static SERIAL_CHANNEL(sa11x0_serial_channel0,
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116 sa11x0_serial_funs,
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117 sa11x0_serial_info0,
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118 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL0_BAUD),
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119 CYG_SERIAL_STOP_DEFAULT,
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120 CYG_SERIAL_PARITY_DEFAULT,
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121 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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122 CYG_SERIAL_FLAGS_DEFAULT
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123 );
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124 #endif
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125
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126 DEVTAB_ENTRY(sa11x0_serial_io0,
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127 CYGDAT_IO_SERIAL_ARM_SA11X0_SERIAL0_NAME,
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128 0, // Does not depend on a lower level interface
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129 &cyg_io_serial_devio,
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130 sa11x0_serial_init,
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131 sa11x0_serial_lookup, // Serial driver may need initializing
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132 &sa11x0_serial_channel0
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133 );
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134 #endif // CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1
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135
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136 #ifdef CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1
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137 static sa11x0_serial_info sa11x0_serial_info1 = {(CYG_ADDRWORD)SA11X0_UART1_CONTROL0,
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138 CYGNUM_HAL_INTERRUPT_UART1};
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139 #if CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE > 0
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140 static unsigned char sa11x0_serial_out_buf1[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE];
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141 static unsigned char sa11x0_serial_in_buf1[CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BUFSIZE];
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142
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143 static SERIAL_CHANNEL_USING_INTERRUPTS(sa11x0_serial_channel1,
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144 sa11x0_serial_funs,
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145 sa11x0_serial_info1,
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146 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BAUD),
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147 CYG_SERIAL_STOP_DEFAULT,
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148 CYG_SERIAL_PARITY_DEFAULT,
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149 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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150 CYG_SERIAL_FLAGS_DEFAULT,
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151 &sa11x0_serial_out_buf1[0], sizeof(sa11x0_serial_out_buf1),
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152 &sa11x0_serial_in_buf1[0], sizeof(sa11x0_serial_in_buf1)
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153 );
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154 #else
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155 static SERIAL_CHANNEL(sa11x0_serial_channel1,
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156 sa11x0_serial_funs,
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157 sa11x0_serial_info1,
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158 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_SA11X0_SERIAL1_BAUD),
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159 CYG_SERIAL_STOP_DEFAULT,
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160 CYG_SERIAL_PARITY_DEFAULT,
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161 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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162 CYG_SERIAL_FLAGS_DEFAULT
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163 );
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164 #endif
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165
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166 DEVTAB_ENTRY(sa11x0_serial_io1,
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167 CYGDAT_IO_SERIAL_ARM_SA11X0_SERIAL1_NAME,
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168 0, // Does not depend on a lower level interface
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169 &cyg_io_serial_devio,
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170 sa11x0_serial_init,
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171 sa11x0_serial_lookup, // Serial driver may need initializing
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172 &sa11x0_serial_channel1
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173 );
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174 #endif // CYGPKG_IO_SERIAL_ARM_SA11X0_SERIAL1
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175
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176 // Internal function to actually configure the hardware to desired baud rate, etc.
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177 static bool
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178 sa11x0_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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179 {
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180 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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181 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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182 unsigned char parity = select_parity[new_config->parity];
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183 unsigned char word_length = select_word_length[new_config->word_length-CYGNUM_SERIAL_WORD_LENGTH_5];
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184 unsigned char stop_bits = select_stop_bits[new_config->stop];
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185 int baud = SA11X0_UART_BAUD_RATE_DIVISOR(select_baud[new_config->baud]);
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186 if ((word_length == 0xFF) ||
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187 (parity == 0xFF) ||
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188 (stop_bits == 0xFF)) {
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189 return false; // Unsupported configuration
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190 }
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191 // Disable Receiver and Transmitter (clears FIFOs)
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192 port->ctl3 = SA11X0_UART_RX_DISABLED |
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193 SA11X0_UART_TX_DISABLED;
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194
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195 // Clear sticky (writable) status bits.
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196 port->stat0 = SA11X0_UART_RX_IDLE |
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197 SA11X0_UART_RX_BEGIN_OF_BREAK |
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198 SA11X0_UART_RX_END_OF_BREAK;
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199
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200 // Set parity, word length, stop bits
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201 port->ctl0 = parity |
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202 word_length |
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203 stop_bits;
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204
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205 // Set the desired baud rate.
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206 port->ctl1 = (baud >> 8) & SA11X0_UART_H_BAUD_RATE_DIVISOR_MASK;
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207 port->ctl2 = baud & SA11X0_UART_L_BAUD_RATE_DIVISOR_MASK;
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208
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209 // Enable the receiver (with interrupts) and the transmitter.
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210 port->ctl3 = SA11X0_UART_RX_ENABLED |
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211 SA11X0_UART_TX_ENABLED |
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212 SA11X0_UART_RX_FIFO_INT_ENABLED;
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213 return true;
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214 }
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215
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216 // Function to initialize the device. Called at bootstrap time.
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217 static bool
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218 sa11x0_serial_init(struct cyg_devtab_entry *tab)
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219 {
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220 serial_channel *chan = (serial_channel *)tab->priv;
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221 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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222 int res;
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223 #ifdef CYGDBG_IO_INIT
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224 diag_printf("SA11X0 SERIAL init - dev: %x.%d\n", sa11x0_chan->base, sa11x0_chan->int_num);
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225 #endif
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226 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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227 if (chan->out_cbuf.len != 0) {
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228 cyg_drv_interrupt_create(sa11x0_chan->int_num,
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229 99, // Priority - unused
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230 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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231 sa11x0_serial_ISR,
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232 sa11x0_serial_DSR,
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233 &sa11x0_chan->serial_interrupt_handle,
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234 &sa11x0_chan->serial_interrupt);
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235 cyg_drv_interrupt_attach(sa11x0_chan->serial_interrupt_handle);
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236 cyg_drv_interrupt_unmask(sa11x0_chan->int_num);
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237 }
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238 res = sa11x0_serial_config_port(chan, &chan->config, true);
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239 return res;
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240 }
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241
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242 // This routine is called when the device is "looked" up (i.e. attached)
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243 static Cyg_ErrNo
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244 sa11x0_serial_lookup(struct cyg_devtab_entry **tab,
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245 struct cyg_devtab_entry *sub_tab,
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246 const char *name)
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247 {
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248 serial_channel *chan = (serial_channel *)(*tab)->priv;
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249 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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250 return ENOERR;
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251 }
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252
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253 // Send a character to the device output buffer.
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254 // Return 'true' if character is sent to device
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255 static bool
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256 sa11x0_serial_putc(serial_channel *chan, unsigned char c)
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257 {
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258 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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259 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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260 if (port->stat1 & SA11X0_UART_TX_FIFO_NOT_FULL) {
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261 port->data = c;
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262 return true;
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263 } else {
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264 return false; // Couldn't send, tx was busy
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265 }
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266 }
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267
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268 // Fetch a character from the device input buffer, waiting if necessary
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269 static unsigned char
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270 sa11x0_serial_getc(serial_channel *chan)
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271 {
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272 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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273 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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274 return port->data;
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275 }
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276
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277 // Set up the device characteristics; baud rate, etc.
115
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278 static Cyg_ErrNo
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279 sa11x0_serial_set_config(serial_channel *chan, cyg_uint32 key,
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280 const void *xbuf, cyg_uint32 *len)
108
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281 {
115
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282 switch (key) {
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283 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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284 {
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285 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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286 if ( *len < sizeof(cyg_serial_info_t) ) {
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287 return -EINVAL;
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288 }
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289 *len = sizeof(cyg_serial_info_t);
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290 if ( true != sa11x0_serial_config_port(chan, config, false) )
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291 return -EINVAL;
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292 }
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293 break;
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294 default:
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295 return -EINVAL;
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296 }
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297 return ENOERR;
108
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298 }
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299
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300 // Enable the transmitter on the device
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301 static void
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302 sa11x0_serial_start_xmit(serial_channel *chan)
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303 {
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304 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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305 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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306 (chan->callbacks->xmt_char)(chan); // Kick transmitter (if necessary)
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307 port->ctl3 |= SA11X0_UART_TX_FIFO_INT_ENABLED;
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308 }
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309
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310 // Disable the transmitter on the device
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311 static void
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312 sa11x0_serial_stop_xmit(serial_channel *chan)
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313 {
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314 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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315 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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316 port->ctl3 &= ~SA11X0_UART_TX_FIFO_INT_ENABLED;
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317 }
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318
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319 // Serial I/O - low level interrupt handler (ISR)
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320 static cyg_uint32
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321 sa11x0_serial_ISR(cyg_vector_t vector, cyg_addrword_t data)
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322 {
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323 cyg_drv_interrupt_mask(vector);
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324 cyg_drv_interrupt_acknowledge(vector);
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325 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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326 }
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327
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328 // Serial I/O - high level interrupt handler (DSR)
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329 static void
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330 sa11x0_serial_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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331 {
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332 serial_channel *chan = (serial_channel *)data;
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333 sa11x0_serial_info *sa11x0_chan = (sa11x0_serial_info *)chan->dev_priv;
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334 volatile struct serial_port *port = (volatile struct serial_port *)sa11x0_chan->base;
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335 unsigned int stat0 = port->stat0;
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336 if (stat0 & SA11X0_UART_TX_SERVICE_REQUEST) {
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337 (chan->callbacks->xmt_char)(chan);
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338 }
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339 if (stat0 & SA11X0_UART_RX_INTS) {
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340 while (port->stat1 & SA11X0_UART_RX_FIFO_NOT_EMPTY) {
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341 (chan->callbacks->rcv_char)(chan, port->data);
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342 }
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343 port->stat0 = SA11X0_UART_RX_IDLE; // Need to clear this manually
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344 }
191
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345 if (stat0 & (SA11X0_UART_RX_BEGIN_OF_BREAK |
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346 SA11X0_UART_RX_END_OF_BREAK ) ) {
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347 // Need to clear any of these manually also or noise
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348 // from plugging in can cause an interrupt loop!
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349 port->stat0 = stat0 & (SA11X0_UART_RX_BEGIN_OF_BREAK |
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350 SA11X0_UART_RX_END_OF_BREAK );
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351 }
108
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352 cyg_drv_interrupt_unmask(vector);
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353 }
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354 #endif