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annotate packages/devs/serial/arm/ebsa285/current/src/ebsa285_serial.c @ 115:6ed91473a1cd ecos-sw-2000-08-21

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Merge from eCos master repository on 2000-08-21-22:40:54-BST
author jlarmour
date Fri, 25 Aug 2000 17:32:38 +0000
parents 6736c52df507
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // devs/serial/arm/ebsa285/current/src/ebsa285_serial.c
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4 //
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5 // ARM EBSA285 Serial I/O Interface Module (interrupt driven)
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): hmt
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35 // Contributors: hmt
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36 // Date: 1999-07-26
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37 // Purpose: EBSA285 Serial I/O module (interrupt driven version)
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38 // Description:
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39 //
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40 //####DESCRIPTIONEND####
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41 //
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42 //==========================================================================
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43
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44 #include <pkgconf/system.h>
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45 #include <pkgconf/io_serial.h>
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46 #include <pkgconf/io.h>
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47
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48 #ifdef CYGPKG_IO_SERIAL_ARM_EBSA285
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49
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50 #include <cyg/io/io.h>
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51 #include <cyg/hal/hal_intr.h>
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52 #include <cyg/io/devtab.h>
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53 #include <cyg/io/serial.h>
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54 #include <cyg/infra/diag.h>
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55
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56 #include <cyg/hal/hal_ebsa285.h> // Hardware definitions
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57
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58 // ------------------------------------------------------------------------
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59 // Baud rates and the like, table-driven setup
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60 #define FCLK_MHZ 50
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61
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62 struct _baud {
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63 unsigned char divisor_high, divisor_low;
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64 };
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65
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66 // The indexing of this table must match the enum in serialio.h
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67 // The arithmetic is (clock/4)/(baud * 16) - 1
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68
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69 #define NONE {0,0}
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70 const static struct _baud bauds[] = {
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71 #if (FCLK_MHZ == 50)
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72 NONE, // unused
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73 NONE, // 50
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74 NONE, // 75
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75 NONE, // 110
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76 NONE, // 134.5
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77 NONE, // 150
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78 NONE, // 200
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79 { 0xA, 0x2B }, // 300 2603 = 0x0A2B
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80 { 0x5, 0x15 }, // 600 1301 = 0x0515
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81 { 0x2, 0x8A }, // 1200 650 = 0x028A
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82 { 0x1, 0xB1 }, // 1800 433 = 0x01B1
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83 { 0x1, 0x45 }, // 2400 325 = 0x0145
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84 { 0x0, 0xD8 }, // 3600 216 = 0x00D8
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85 { 0x0, 0xA2 }, // 4800 162 = 0x00A2
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86 { 0x0, 0x6B }, // 7200 107 = 0x006B
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87 { 0x0, 0x50 }, // 9600 80 = 0x0050
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88 { 0x0, 0x35 }, // 14400 53 = 0x0035
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89 { 0x0, 0x28 }, // 19200 40 = 0x0028
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90 { 0x0, 0x13 }, // 38400 19 = 0x0013
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91 NONE, // 57600
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92 NONE, // 115200
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93 NONE // 230400
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94 #elif (FCLK_MHZ == 60)
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95 #error NOT SUPPORTED - these figures are more for documentation
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96 { /* 300, */ 0xC, 0x34}, /* 2603 = 0x0A2B */
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97 { /* 600, */ 0x6, 0x19}, /* 1301 = 0x0515 */
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98 { /* 1200, */ 0x3, 0x0C}, /* 650 = 0x028A */
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99 { /* 2400, */ 0x1, 0x86}, /* 325 = 0x0145 */
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100 { /* 4800, */ 0x0, 0xC2}, /* 162 = 0x00A2 */
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101 { /* 9600, */ 0x0, 0x61}, /* 80 = 0x0050 */
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102 { /* 19200, */ 0x0, 0x30}, /* 40 = 0x0028 */
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103 { /* 38400, */ 0x0, 0x17}, /* 19 = 0x0013 */
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104 #endif
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105 };
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106
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107 static int select_word_length[] = {
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108 SA110_UART_DATA_LENGTH_5_BITS, // 5 bits
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109 SA110_UART_DATA_LENGTH_6_BITS, // 6 bits
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110 SA110_UART_DATA_LENGTH_7_BITS, // 7 bits
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111 SA110_UART_DATA_LENGTH_8_BITS // 8 bits
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112 };
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113
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114 static int select_stop_bits[] = {
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115 -1, // unused
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116 SA110_UART_STOP_BITS_ONE, // 1 stop bit
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117 -1, // 1.5 stop bit
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118 SA110_UART_STOP_BITS_TWO // 2 stop bits
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119 };
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120
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121 static int select_parity[] = {
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122 SA110_UART_PARITY_DISABLED, // No parity
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123 SA110_UART_PARITY_ENABLED | SA110_UART_PARITY_EVEN, // Even parity
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124 SA110_UART_PARITY_ENABLED | SA110_UART_PARITY_ODD, // Odd parity
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125 -1, // Mark parity
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126 -1 // Space parity
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127 };
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128
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129 // ------------------------------------------------------------------------
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130 // some forward references
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131
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132 struct ebsa285_serial_interrupt {
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133 CYG_WORD int_num;
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134 cyg_interrupt serial_interrupt;
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135 cyg_handle_t serial_interrupt_handle;
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136 };
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137
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138 typedef struct ebsa285_serial_info {
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139 struct ebsa285_serial_interrupt rx;
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140 struct ebsa285_serial_interrupt tx;
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141 int tx_active;
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142 } ebsa285_serial_info;
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143
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144 static bool ebsa285_serial_init(struct cyg_devtab_entry *tab);
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145 static bool ebsa285_serial_putc(serial_channel *chan, unsigned char c);
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146 static Cyg_ErrNo ebsa285_serial_lookup(struct cyg_devtab_entry **tab,
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147 struct cyg_devtab_entry *sub_tab,
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148 const char *name);
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149 static unsigned char ebsa285_serial_getc(serial_channel *chan);
115
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150 static Cyg_ErrNo ebsa285_serial_set_config(serial_channel *chan, cyg_uint32 key,
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151 const void *xbuf, cyg_uint32 *len);
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152
82
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153 static void ebsa285_serial_start_xmit(serial_channel *chan);
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154 static void ebsa285_serial_stop_xmit(serial_channel *chan);
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155
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156 static cyg_uint32 ebsa285_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data);
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157 static void ebsa285_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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158 static cyg_uint32 ebsa285_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data);
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159 static void ebsa285_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data);
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160
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161 static SERIAL_FUNS(ebsa285_serial_funs,
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162 ebsa285_serial_putc,
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163 ebsa285_serial_getc,
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164 ebsa285_serial_set_config,
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165 ebsa285_serial_start_xmit,
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166 ebsa285_serial_stop_xmit
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167 );
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168
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169
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170 // ------------------------------------------------------------------------
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171 // this is dummy in config: there is only one device on the EBSA285
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172 #ifdef CYGPKG_IO_SERIAL_ARM_EBSA285_SERIAL
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173
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174 static ebsa285_serial_info ebsa285_serial_info1 = {
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175 { CYGNUM_HAL_INTERRUPT_SERIAL_RX },
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176 { CYGNUM_HAL_INTERRUPT_SERIAL_TX },
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177 0
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178 };
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179
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180 #if CYGNUM_IO_SERIAL_ARM_EBSA285_SERIAL_BUFSIZE > 0
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181 static unsigned char ebsa285_serial_out_buf[CYGNUM_IO_SERIAL_ARM_EBSA285_SERIAL_BUFSIZE];
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182 static unsigned char ebsa285_serial_in_buf[CYGNUM_IO_SERIAL_ARM_EBSA285_SERIAL_BUFSIZE];
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183
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184 static SERIAL_CHANNEL_USING_INTERRUPTS(ebsa285_serial_channel,
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185 ebsa285_serial_funs,
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186 ebsa285_serial_info1,
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187 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EBSA285_SERIAL_BAUD),
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188 CYG_SERIAL_STOP_DEFAULT,
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189 CYG_SERIAL_PARITY_DEFAULT,
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190 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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191 CYG_SERIAL_FLAGS_DEFAULT,
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192 &ebsa285_serial_out_buf[0], sizeof(ebsa285_serial_out_buf),
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193 &ebsa285_serial_in_buf[0], sizeof(ebsa285_serial_in_buf)
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194 );
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195 #else
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196 static SERIAL_CHANNEL(ebsa285_serial_channel,
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197 ebsa285_serial_funs,
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198 ebsa285_serial_info1,
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199 CYG_SERIAL_BAUD_RATE(CYGNUM_IO_SERIAL_ARM_EBSA285_SERIAL_BAUD),
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200 CYG_SERIAL_STOP_DEFAULT,
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201 CYG_SERIAL_PARITY_DEFAULT,
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202 CYG_SERIAL_WORD_LENGTH_DEFAULT,
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203 CYG_SERIAL_FLAGS_DEFAULT
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204 );
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205 #endif
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206
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207 DEVTAB_ENTRY(ebsa285_serial_io,
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208 CYGDAT_IO_SERIAL_ARM_EBSA285_SERIAL_NAME,
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209 0, // Does not depend on a lower level interface
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210 &cyg_io_serial_devio,
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211 ebsa285_serial_init,
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212 ebsa285_serial_lookup, // Serial driver may need initializing
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213 &ebsa285_serial_channel
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214 );
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215 #endif // CYGPKG_IO_SERIAL_ARM_EBSA285_SERIAL
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216
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217 // ------------------------------------------------------------------------
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218
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219
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220 // ------------------------------------------------------------------------
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221 // Internal function to actually configure the hardware to desired baud rate, etc.
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222 static bool
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223 ebsa285_serial_config_port(serial_channel *chan, cyg_serial_info_t *new_config, bool init)
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224 {
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225 int dummy, h, m, l;
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226
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227 // Make sure everything is off
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228 *SA110_UART_CONTROL_REGISTER = SA110_UART_DISABLED | SA110_SIR_DISABLED;
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229
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230 // Read the RXStat to drain the fifo
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231 dummy = *SA110_UART_RXSTAT;
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232
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233 // Set the baud rate - this also turns the uart on.
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234 //
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235 // Note that the ordering of these writes is critical,
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236 // and the writes to the H_BAUD_CONTROL and CONTROL_REGISTER
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237 // are necessary to force the UART to update its register
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238 // contents.
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239
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240 l = bauds[new_config->baud].divisor_low; // zeros in unused slots here
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241 m = bauds[new_config->baud].divisor_high; // and here
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242 h = SA110_UART_BREAK_DISABLED |
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243 select_stop_bits[new_config->stop] | // -1s in unused slots for these
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244 select_parity[new_config->parity] | // and these
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245 SA110_UART_FIFO_ENABLED | // and these below
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246 select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5];
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247
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248 if ( 0 != (l + m) && h >= 0 && h < 256 ) {
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249 *SA110_UART_L_BAUD_CONTROL = l;
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250 *SA110_UART_M_BAUD_CONTROL = m;
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251 *SA110_UART_H_BAUD_CONTROL = h;
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252 init = true; // AOK
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253 }
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254 else if ( init ) {
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255 // put in some sensible defaults
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256 *SA110_UART_L_BAUD_CONTROL = 0x13; // bp->divisor_low;
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257 *SA110_UART_M_BAUD_CONTROL = 0x00; // bp->divisor_high;
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258 *SA110_UART_H_BAUD_CONTROL = SA110_UART_BREAK_DISABLED |
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259 SA110_UART_PARITY_DISABLED |
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260 SA110_UART_STOP_BITS_ONE |
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261 SA110_UART_FIFO_ENABLED |
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262 SA110_UART_DATA_LENGTH_8_BITS;
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263 }
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264
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265 // All set, re-enable the device:
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266 *SA110_UART_CONTROL_REGISTER = SA110_UART_ENABLED | SA110_SIR_DISABLED;
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267
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268 if (init && new_config != &chan->config) {
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269 // record the new setup
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270 chan->config = *new_config;
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271 }
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272 // All done
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273 return init;
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274 }
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275
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276 // Function to initialize the device. Called at bootstrap time.
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277 static bool
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278 ebsa285_serial_init(struct cyg_devtab_entry *tab)
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279 {
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280 serial_channel *chan = (serial_channel *)tab->priv;
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281 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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282 #ifdef CYGDBG_IO_INIT
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283 diag_printf("EBSA285 SERIAL init - dev: %x\n", ebsa285_chan);
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284 #endif
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285 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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286 if (chan->out_cbuf.len != 0) {
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287
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288 // first for rx
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289 cyg_drv_interrupt_create(ebsa285_chan->rx.int_num,
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290 99, // Priority - unused
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291 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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292 ebsa285_serial_rx_ISR,
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293 ebsa285_serial_rx_DSR,
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294 &ebsa285_chan->rx.serial_interrupt_handle,
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295 &ebsa285_chan->rx.serial_interrupt);
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296 cyg_drv_interrupt_attach(ebsa285_chan->rx.serial_interrupt_handle);
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297 cyg_drv_interrupt_unmask(ebsa285_chan->rx.int_num);
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298
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299 // then for tx
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300 cyg_drv_interrupt_create(ebsa285_chan->tx.int_num,
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301 99, // Priority - unused
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302 (cyg_addrword_t)chan, // Data item passed to interrupt handler
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303 ebsa285_serial_tx_ISR,
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304 ebsa285_serial_tx_DSR,
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305 &ebsa285_chan->tx.serial_interrupt_handle,
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306 &ebsa285_chan->tx.serial_interrupt);
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307 cyg_drv_interrupt_attach(ebsa285_chan->tx.serial_interrupt_handle);
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308 // DO NOT cyg_drv_interrupt_unmask(ebsa285_chan->tx.int_num);
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309 ebsa285_chan->tx_active = 0;
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310 }
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311 (void)ebsa285_serial_config_port(chan, &chan->config, true);
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312 return true;
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313 }
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314
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315 // This routine is called when the device is "looked" up (i.e. attached)
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316 static Cyg_ErrNo
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317 ebsa285_serial_lookup(struct cyg_devtab_entry **tab,
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318 struct cyg_devtab_entry *sub_tab,
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319 const char *name)
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320 {
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321 serial_channel *chan = (serial_channel *)(*tab)->priv;
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322 (chan->callbacks->serial_init)(chan); // Really only required for interrupt driven devices
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323 return ENOERR;
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324 }
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325
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326 // Send a character to the device output buffer.
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327 // Return 'true' if character is sent to device
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328 static bool
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329 ebsa285_serial_putc(serial_channel *chan, unsigned char c)
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330 {
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331 if ((*SA110_UART_FLAG_REGISTER & SA110_TX_FIFO_STATUS_MASK) == SA110_TX_FIFO_BUSY)
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332 return false; // No space
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333
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334 *SA110_UART_DATA_REGISTER = c; // Transmit buffer is empty
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335 return true;
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336 }
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337
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338 // Fetch a character from the device input buffer, waiting if necessary
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339 static unsigned char
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340 ebsa285_serial_getc(serial_channel *chan)
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341 {
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342 unsigned char c;
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343 while ((*SA110_UART_FLAG_REGISTER & SA110_RX_FIFO_STATUS_MASK) == SA110_RX_FIFO_EMPTY)
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344 ; // wait for char
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345 c = (char)(*SA110_UART_DATA_REGISTER & 0xFF);
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346 // no error checking... no way to return the info
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347 return c;
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348 }
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349
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350 // Set up the device characteristics; baud rate, etc.
115
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351 static Cyg_ErrNo
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352 ebsa285_serial_set_config(serial_channel *chan, cyg_uint32 key,
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353 const void *xbuf, cyg_uint32 *len)
82
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354 {
115
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355 switch (key) {
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356 case CYG_IO_SET_CONFIG_SERIAL_INFO:
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357 {
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358 cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
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359 if ( *len < sizeof(cyg_serial_info_t) ) {
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360 return -EINVAL;
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361 }
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362 *len = sizeof(cyg_serial_info_t);
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363 if ( true != ebsa285_serial_config_port(chan, config, false) )
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364 return -EINVAL;
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365 }
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366 break;
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367 default:
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368 return -EINVAL;
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369 }
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370 return ENOERR;
82
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371 }
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372
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373 // Enable the transmitter on the device (nope, already in use by hal_diag)
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374 static void
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375 ebsa285_serial_start_xmit(serial_channel *chan)
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376 {
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377 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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378 ebsa285_chan->tx_active = 1;
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379 cyg_drv_interrupt_unmask(ebsa285_chan->tx.int_num);
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380 }
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381
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382 // Disable the transmitter on the device (nope, remains in use by hal_diag)
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383 static void
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384 ebsa285_serial_stop_xmit(serial_channel *chan)
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385 {
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386 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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387 cyg_drv_interrupt_mask(ebsa285_chan->tx.int_num);
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388 ebsa285_chan->tx_active = 0;
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389 }
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390
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391 // Serial I/O - low level interrupt handlers (ISR)
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392 static cyg_uint32
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393 ebsa285_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data)
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394 {
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395 serial_channel *chan = (serial_channel *)data;
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396 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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397 cyg_drv_interrupt_mask(ebsa285_chan->rx.int_num);
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398 cyg_drv_interrupt_acknowledge(ebsa285_chan->rx.int_num);
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399 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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400 }
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401
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402 static cyg_uint32
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403 ebsa285_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data)
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404 {
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405 serial_channel *chan = (serial_channel *)data;
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406 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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407 cyg_drv_interrupt_mask(ebsa285_chan->tx.int_num);
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408 cyg_drv_interrupt_acknowledge(ebsa285_chan->tx.int_num);
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409 return CYG_ISR_CALL_DSR; // Cause DSR to be run
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410 }
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411
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412 // Serial I/O - high level interrupt handlers (DSR)
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413 static void
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414 ebsa285_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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415 {
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416 serial_channel *chan = (serial_channel *)data;
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417 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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418 if ((*SA110_UART_FLAG_REGISTER & SA110_RX_FIFO_STATUS_MASK) != SA110_RX_FIFO_EMPTY) {
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419 char c;
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420 int status;
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421 c = (char)(*SA110_UART_DATA_REGISTER & 0xFF);
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422 status = *SA110_UART_RXSTAT;
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423 if ( 0 == (status & (SA110_UART_FRAMING_ERROR_MASK |
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424 SA110_UART_PARITY_ERROR_MASK |
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425 SA110_UART_OVERRUN_ERROR_MASK)) )
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426 (chan->callbacks->rcv_char)(chan, c);
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427 }
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428 cyg_drv_interrupt_unmask(ebsa285_chan->rx.int_num);
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429 }
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430
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431 static void
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432 ebsa285_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
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433 {
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434 serial_channel *chan = (serial_channel *)data;
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435 ebsa285_serial_info *ebsa285_chan = (ebsa285_serial_info *)chan->dev_priv;
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436 if ((*SA110_UART_FLAG_REGISTER & SA110_TX_FIFO_STATUS_MASK) != SA110_TX_FIFO_BUSY) {
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437 (chan->callbacks->xmt_char)(chan);
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438 }
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439 if ( ebsa285_chan->tx_active ) // it might be halted in callback above
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440 cyg_drv_interrupt_unmask(ebsa285_chan->tx.int_num);
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441 }
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442 #endif // CYGPKG_IO_SERIAL_ARM_EBSA285
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443
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444 // ------------------------------------------------------------------------
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445 // EOF ebsa285_serial.c