1 | /* |
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2 | * console.c |
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3 | * |
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4 | * This file contains the MVME167 termios console package. Only asynchronous |
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5 | * I/O is supported. Normal I/O uses DMA for output, interrupts for input. |
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6 | * Very limited support is provided for polled I/O. Polled I/O is intended |
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7 | * only for running the RTEMS test suites, and uses the 167Bug console only. |
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8 | * |
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9 | * /dev/tty0 is channel 0, Serial Port 1/Console on the MVME712M. |
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10 | * /dev/tty1 is channel 1, Serial Port 2/TTY01 on the MVME712M. |
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11 | * /dev/tty2 is channel 2, Serial Port 3 on the MVME712M. |
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12 | * /dev/tty3 is channel 3, Serial Port 4 on the MVME712M. |
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13 | * |
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14 | * /dev/console is fixed to be /dev/tty01, Serial Port 2. 167Bug is given |
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15 | * Serial Port 1/Console. Do not open /dev/tty00. |
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16 | * |
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17 | * Modern I/O chips often contain a number of I/O devices that can operate |
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18 | * almost independently of each other. Typically, in RTEMS, all devices in |
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19 | * an I/O chip are handled by a single device driver, but that need not be |
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20 | * always the case. Each device driver must supply six entry points in the |
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21 | * Device Driver Table: a device initialization function, as well as an open, |
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22 | * close, read, write and a control function. RTEMS assigns a device major |
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23 | * number to each device driver. This major device number is the index of the |
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24 | * device driver entries in the Device Driver Table, and it used to identify |
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25 | * a particular device driver. To distinguish multiple I/O sub-devices within |
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26 | * an I/O chip, RTEMS supports device minor numbers. When a I/O device is |
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27 | * initialized, the major number is supplied to the initialization function. |
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28 | * That function must register each sub-device with a separate name and minor |
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29 | * number (as well as the supplied major number). When an application opens a |
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30 | * device by name, the corresponding major and minor numbers are returned to |
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31 | * the caller to be used in subsequent I/O operations (although these details |
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32 | * are typically hidden within the library functions). |
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33 | * |
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34 | * Such a scheme recognizes that the initialization of the individual |
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35 | * sub-devices is generally not completely independent. For example, the |
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36 | * four serial ports of the CD2401 can be configured almost independently |
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37 | * from each other. One port could be configured to operate in asynchronous |
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38 | * mode with interrupt-driven I/O, while another port could be configured to |
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39 | * operate in HDLC mode with DMA I/O. However, a device reset command will |
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40 | * reset all four channels, and the width of DMA transfers and the number of |
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41 | * retries following bus errors selected applies to all four channels. |
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42 | * Consequently, when initializing one channel, one must be careful not to |
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43 | * destroy the configuration of other channels that are already configured. |
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44 | * |
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45 | * One problem with the RTEMS I/O initialization model is that no information |
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46 | * other than a device major number is passed to the initialization function. |
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47 | * Consequently, the sub-devices must be initialized with some pre-determined |
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48 | * configuration. To change the configuration of a sub-device, it is |
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49 | * necessary to either rewrite the initialization function, or to make a |
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50 | * series of rtems_io_control() calls after initialization. The first |
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51 | * approach is not very elegant. The second approach is acceptable if an |
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52 | * application is simply changing baud rates, parity or other such |
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53 | * asynchronous parameters (as supplied by the termios package). But what if |
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54 | * an application requires one channel to run in HDLC or Bisync mode and |
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55 | * another in async mode? With a single driver per I/O chip approach, the |
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56 | * device driver must support multiple protocols. This is feasible, but it |
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57 | * often means that an application that only does asynchronous I/O now links |
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58 | * in code for other unused protocols, thus wasting precious ROM space. |
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59 | * Worse, it requires that the sub-devices be initialized in some |
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60 | * configuration, and that configuration then changed through a series of |
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61 | * device driver control calls. There is no standard API in RTEMS to switch |
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62 | * a serial line to some synchronous protocol. |
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63 | * |
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64 | * A better approach is to treat each channel as a separate device, each with |
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65 | * its own device device driver. The application then supplies its own device |
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66 | * driver table with only the required protocols (drivers) on each line. The |
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67 | * problem with this approach is that the device drivers are not really |
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68 | * independent, given that the I/O sub-devices within a common chip are not |
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69 | * independent themselves. Consequently, the related device drivers must |
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70 | * share some information. In RTEMS, there is no standard location in which |
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71 | * to share information. |
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72 | * |
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73 | * This driver handles all four channels, i.e. it distinguishes the |
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74 | * sub-devices using minor device numbers. Only asynchronous I/O is |
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75 | * supported. The console is currently fixed to be channel 1 on the CD2401, |
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76 | * which corresponds to the TTY01 port (Serial Port 2) on the MVME712M |
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77 | * Transition Module. |
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78 | * |
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79 | * The CD2401 does either interrupt-driven or DMA I/O; it does not support |
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80 | * polling. In interrupt-driven or DMA I/O modes, interrupts from the CD2401 |
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81 | * are routed to the MC68040, and the processor generates an interrupt |
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82 | * acknowledge cycle directly to the CD2401 to obtain an interrupt vector. |
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83 | * The PCCchip2 supports a pseudo-polling mode in which interrupts from the |
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84 | * CD2401 are not routed to the MC68040, but can be detected by the processor |
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85 | * by reading the appropriate CD2401 registers. In this mode, interrupt |
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86 | * acknowledge cycles must be generated to the CD2401 by reading the |
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87 | * appropriate PCCchip2 registers. |
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88 | * |
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89 | * Interrupts from the four channels cannot be routed independently; either |
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90 | * all channels are used in the pseudo-polling mode, or all channels are used |
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91 | * in interrupt-driven/DMA mode. There is no advantage in using the speudo- |
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92 | * polling mode. Consenquently, this driver performs DMA input and output. |
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93 | * Output is performed directly from the termios raw output buffer, while |
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94 | * input is accumulated into a separate buffer. |
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95 | * |
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96 | * THIS MODULE IS NOT RE-ENTRANT! Simultaneous access to a device from |
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97 | * multiple tasks is likely to cause significant problems! Concurrency |
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98 | * control is implemented in the termios package. |
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99 | * |
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100 | * THE INTERRUPT LEVEL IS SET TO 1 FOR ALL CHANNELS. |
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101 | * If the CD2401 is to be used for high speed synchronous serial I/O, the |
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102 | * interrupt priority might need to be increased. |
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103 | * |
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104 | * ALL INTERRUPT HANDLERS ARE SHARED. |
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105 | * When adding extra device drivers, either rewrite the interrupt handlers |
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106 | * to demultiplex the interrupts, or install separate vectors. Common vectors |
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107 | * are currently used to catch spurious interrupts. We could already have |
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108 | * installed separate vectors for each channel and used the spurious |
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109 | * interrupt handler defined in some other BSPs, but handling spurious |
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110 | * interrupts from the CD2401 in this device driver allows us to record more |
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111 | * information on the source of the interrupts. Furthermore, we have observed |
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112 | * the occasional spurious interrupt from channel 0. We definitely do not |
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113 | * to call a debugger for those. |
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114 | * |
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115 | * All page references are to the MVME166/MVME167/MVME187 Single Board |
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116 | * Computer Programmer's Reference Guide (MVME187PG/D2) with the April |
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117 | * 1993 supplements/addenda (MVME187PG/D2A1). |
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118 | * |
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119 | * Copyright (c) 1998, National Research Council of Canada |
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120 | * |
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121 | * The license and distribution terms for this file may be |
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122 | * found in the file LICENSE in this distribution or at |
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123 | * http://www.OARcorp.com/rtems/license.html. |
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124 | */ |
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125 | |
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126 | #define M167_INIT |
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127 | |
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128 | #include <termios.h> |
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129 | #include <bsp.h> /* Must be before libio.h */ |
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130 | #include <rtems/libio.h> |
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131 | |
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132 | #define CD2401_INT_LEVEL 1 /* Interrupt level for the CD2401 */ |
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133 | #define CD2401_POLLED_IO 0 /* 0 for interrupt-driven, 1 for polled I/O */ |
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134 | |
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135 | |
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136 | /* Channel info */ |
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137 | /* static */ struct { |
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138 | void *tty; /* Really a struct rtems_termios_tty * */ |
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139 | int len; /* Record nb of chars being TX'ed */ |
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140 | const char *buf; /* Record where DMA is coming from */ |
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141 | rtems_unsigned16 used_buf_A; /* Nb of times we used output DMA channel A */ |
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142 | rtems_unsigned16 used_buf_B; /* Nb of times we used output DMA channel B */ |
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143 | rtems_unsigned16 wait_buf_A; /* Nb of times we waited for output DMA channel A */ |
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144 | rtems_unsigned16 wait_buf_B; /* Nb of times we waited for output DMA channel B */ |
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145 | rtems_unsigned32 spur_cnt; /* Nb of spurious ints so far */ |
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146 | rtems_unsigned32 spur_dev; /* Indo on last spurious int */ |
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147 | rtems_unsigned32 buserr_addr; /* Faulting address */ |
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148 | rtems_unsigned32 buserr_type; /* Reason of bus error during DMA */ |
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149 | } CD2401_Channel_Info[4]; |
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150 | |
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151 | /* |
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152 | * The number of channels already opened. If zero, enable the interrupts. The |
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153 | * initial value must be 0. If initialized explicitly, the variable ends up |
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154 | * in the .data section. Its value is not re-initialized on system restart. |
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155 | * Furthermore, because the variable is changed, the .data section would not |
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156 | * be ROMable. We thus leave the variable uninitialized, which causes it to |
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157 | * be allocated in the .bss section, and rely on RTEMS to zero the .bss |
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158 | * section on every startup. |
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159 | */ |
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160 | rtems_unsigned8 Init_count; |
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161 | |
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162 | |
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163 | /* Record previous handlers */ |
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164 | rtems_isr_entry Prev_re_isr; /* Previous rx exception isr */ |
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165 | rtems_isr_entry Prev_rx_isr; /* Previous rx isr */ |
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166 | rtems_isr_entry Prev_tx_isr; /* Previous tx isr */ |
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167 | rtems_isr_entry Prev_modem_isr; /* Previous modem/timer isr */ |
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168 | |
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169 | /* Utility functions */ |
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170 | void cd2401_chan_cmd( rtems_unsigned8 channel, rtems_unsigned8 cmd, rtems_unsigned8 wait ); |
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171 | rtems_unsigned16 cd2401_bitrate_divisor( rtems_unsigned32 clkrate, rtems_unsigned32* bitrate ); |
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172 | void cd2401_initialize( void ); |
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173 | void cd2401_interrupts_initialize( rtems_boolean enable ); |
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174 | |
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175 | /* ISRs */ |
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176 | rtems_isr cd2401_modem_isr( rtems_vector_number vector ); |
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177 | rtems_isr cd2401_re_isr( rtems_vector_number vector ); |
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178 | rtems_isr cd2401_rx_isr( rtems_vector_number vector ); |
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179 | rtems_isr cd2401_tx_isr( rtems_vector_number vector ); |
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180 | |
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181 | /* Termios callbacks */ |
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182 | int cd2401_firstOpen( int major, int minor, void *arg ); |
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183 | int cd2401_lastClose( int major, int minor, void *arg ); |
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184 | int cd2401_setAttributes( int minor, const struct termios *t ); |
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185 | int cd2401_startRemoteTx( int minor ); |
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186 | int cd2401_stopRemoteTx( int minor ); |
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187 | int cd2401_write( int minor, const char *buf, int len ); |
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188 | int _167Bug_pollRead( int minor ); |
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189 | int _167Bug_pollWrite( int minor, const char *buf, int len ); |
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190 | |
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191 | |
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192 | /* |
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193 | * Utility functions. |
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194 | */ |
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195 | |
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196 | /* |
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197 | * cd2401_chan_cmd |
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198 | * |
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199 | * Sends a CCR command to the specified channel. Waits for any unfinished |
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200 | * previous command to complete, then sends the specified command. Optionally |
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201 | * wait for the current command to finish before returning. |
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202 | * |
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203 | * Input parameters: |
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204 | * channel - CD2401 channel number |
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205 | * cmd - command byte |
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206 | * wait - if non-zero, wait for specified command to complete before |
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207 | * returning. |
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208 | * |
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209 | * Output parameters: NONE |
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210 | * |
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211 | * Return values: NONE |
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212 | */ |
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213 | void cd2401_chan_cmd( |
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214 | rtems_unsigned8 channel, |
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215 | rtems_unsigned8 cmd, |
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216 | rtems_unsigned8 wait |
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217 | ) |
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218 | { |
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219 | if ( channel < 4 ) { |
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220 | cd2401->car = channel; /* Select channel */ |
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221 | |
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222 | while ( cd2401->ccr != 0 ); /* Wait for completion of any previous command */ |
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223 | cd2401->ccr = cmd; /* Send command */ |
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224 | if ( wait ) |
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225 | while( cd2401->ccr != 0 );/* Wait for completion */ |
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226 | } |
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227 | else { |
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228 | /* This may not be the best error message */ |
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229 | rtems_fatal_error_occurred( RTEMS_INVALID_NUMBER ); |
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230 | } |
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231 | } |
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232 | |
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233 | |
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234 | /* |
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235 | * cd2401_bitrate_divisor |
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236 | * |
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237 | * Compute the divisor and clock source to use to obtain the desired bitrate. |
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238 | * |
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239 | * Input parameters: |
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240 | * clkrate - system clock rate (CLK input frequency) |
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241 | * bitrate - the desired bitrate |
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242 | * |
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243 | * Output parameters: |
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244 | * bitrate - The actual bitrate achievable, to the nearest bps. |
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245 | * |
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246 | * Return values: |
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247 | * Returns divisor in lower byte and clock source in upper byte for the |
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248 | * specified bitrate. |
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249 | */ |
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250 | rtems_unsigned16 cd2401_bitrate_divisor( |
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251 | rtems_unsigned32 clkrate, |
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252 | rtems_unsigned32* bitrate |
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253 | ) |
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254 | { |
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255 | rtems_unsigned32 divisor; |
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256 | rtems_unsigned16 clksource; |
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257 | |
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258 | divisor = *bitrate << 3; /* temporary; multiply by 8 for CLK/8 */ |
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259 | divisor = (clkrate + (divisor>>1)) / divisor; /* divisor for clk0 (CLK/8) */ |
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260 | |
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261 | /* Use highest speed clock source for best precision - try from clk0 to clk4: */ |
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262 | for( clksource = 0; clksource < 0x0400 && divisor > 0x100; clksource += 0x0100 ) |
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263 | divisor >>= 2; |
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264 | divisor--; /* adjustment, see specs */ |
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265 | if( divisor < 1 ) |
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266 | divisor = 1; |
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267 | else if( divisor > 0xFF ) |
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268 | divisor = 0xFF; |
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269 | *bitrate = clkrate / (1 << ((clksource >> 7)+3)) / (divisor+1); |
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270 | return( clksource | divisor ); |
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271 | } |
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272 | |
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273 | |
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274 | /* |
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275 | * cd2401_initialize |
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276 | * |
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277 | * Initializes the CD2401 device. Individual channels on the chip are left in |
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278 | * their default reset state, and should be subsequently configured. |
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279 | * |
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280 | * Input parameters: NONE |
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281 | * |
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282 | * Output parameters: NONE |
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283 | * |
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284 | * Return values: NONE |
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285 | */ |
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286 | void cd2401_initialize( void ) |
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287 | { |
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288 | int i; |
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289 | |
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290 | for ( i = 3; i >= 0; i-- ) { |
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291 | /* |
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292 | * Paranoia -- Should already be blank because array should be in bss |
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293 | * section, which is explicitly zeroed at boot time. |
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294 | */ |
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295 | CD2401_Channel_Info[i].tty = NULL; |
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296 | CD2401_Channel_Info[i].len = 0; |
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297 | CD2401_Channel_Info[i].buf = NULL; |
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298 | CD2401_Channel_Info[i].used_buf_A = 0; |
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299 | CD2401_Channel_Info[i].used_buf_B = 0; |
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300 | CD2401_Channel_Info[i].wait_buf_A = 0; |
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301 | CD2401_Channel_Info[i].wait_buf_B = 0; |
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302 | CD2401_Channel_Info[i].spur_cnt = 0; |
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303 | CD2401_Channel_Info[i].spur_dev = 0; |
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304 | CD2401_Channel_Info[i].buserr_type = 0; |
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305 | CD2401_Channel_Info[i].buserr_addr = 0; |
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306 | } |
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307 | |
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308 | /* |
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309 | * Normally, do a device reset here. If we do it, we will most likely clober |
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310 | * the port settings for 167Bug on channel 0. So we just shut up all the |
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311 | * ports by disabling their interrupts. |
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312 | */ |
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313 | #if 0 |
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314 | cd2401->gfrcr = 0; /* So we can detect that device init is done */ |
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315 | cd2401_chan_cmd( 0x10, 0); /* Reset all */ |
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316 | while(cd2401->gfrcr == 0); /* Wait for reset all */ |
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317 | #endif |
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318 | |
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319 | /* |
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320 | * The CL-CD2400/2401 manual (part no 542400-003) states on page 87 that |
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321 | * the LICR "contains the number of the interrupting channel being served. |
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322 | * The channel number is always that of the current acknowledged interrupt." |
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323 | * THE USER MUST PROGRAM CHANNEL NUMBER IN LICR! It is not set automatically |
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324 | * by the hardware, as suggested by the manual. |
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325 | * |
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326 | * The updated manual (part no 542400-007) has the story strait. The CD2401 |
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327 | * automatically initializes the LICR to contain the channel number in bits |
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328 | * 2 and 3. However, these bits are not preserved when the user defined bits |
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329 | * are written. |
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330 | * |
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331 | * The same vector number is used for all four channels. Different vector |
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332 | * numbers could be programmed for each channel, thus avoiding the need to |
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333 | * demultiplex the interrupts in the ISR. |
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334 | */ |
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335 | for ( i = 0; i < 4; i++ ) { |
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336 | cd2401->car = i; /* Select channel */ |
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337 | cd2401->livr = 0x5C; /* Motorola suggested value p. 3-15 */ |
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338 | cd2401->licr = i << 2; /* Don't rely on reset value */ |
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339 | cd2401->ier = 0; /* Disable all interrupts */ |
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340 | } |
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341 | |
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342 | /* |
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343 | * The content of the CD2401 xpilr registers must match the A7-A0 addresses |
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344 | * generated by the PCCchip2 during interrupt acknowledge cycles in order |
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345 | * for the CD2401 to recognize the IACK cycle and clear its interrupt |
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346 | * request. |
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347 | */ |
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348 | cd2401->mpilr = 0x01; /* Match pccchip2->modem_piack p. 3-27 */ |
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349 | cd2401->tpilr = 0x02; /* Match pccchip2->tx_piack p. 3-28 */ |
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350 | cd2401->rpilr = 0x03; /* Match pccchip2->rx_piack p. 3-29 */ |
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351 | |
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352 | /* Global CD2401 registers */ |
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353 | cd2401->dmr = 0; /* 16-bit DMA transfers when possible */ |
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354 | cd2401->bercnt = 0; /* Do not retry DMA upon bus errors */ |
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355 | |
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356 | /* |
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357 | * Setup timer prescaler period, which clocks timers 1 and 2 (or rx timeout |
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358 | * and tx delay). The prescaler is clocked by the system clock) / 2048. The |
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359 | * register must be in the range 0x0A..0xFF, ie. a rescaler period range of |
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360 | * about 1ms..26ms for a nominal system clock rate of 20MHz. |
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361 | */ |
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362 | cd2401->tpr = 0x0A; /* Same value as 167Bug */ |
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363 | } |
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364 | |
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365 | |
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366 | /* |
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367 | * cd2401_interrupts_initialize |
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368 | * |
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369 | * This routine enables or disables the CD2401 interrupts to the MC68040. |
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370 | * Interrupts cannot be enabled/disabled on a per-channel basis. |
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371 | * |
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372 | * Input parameters: |
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373 | * enable - if true, enable the interrupts, else disable them. |
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374 | * |
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375 | * Output parameters: NONE |
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376 | * |
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377 | * Return values: NONE |
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378 | * |
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379 | * THE FIRST CD2401 CHANNEL OPENED SHOULD ENABLE INTERRUPTS. |
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380 | * THE LAST CD2401 CHANNEL CLOSED SHOULD DISABLE INTERRUPTS. |
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381 | */ |
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382 | void cd2401_interrupts_initialize( |
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383 | rtems_boolean enable |
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384 | ) |
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385 | { |
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386 | if ( enable ) { |
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387 | /* |
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388 | * Enable interrupts from the CD2401 in the PCCchip2. |
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389 | * During DMA transfers, the MC68040 supplies dirty data during read cycles |
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390 | * from the CD2401 and leaves the data dirty in its data cache if there is |
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391 | * a cache hit. The MC68040 updates the data cache during write cycles from |
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392 | * the CD2401 if there is a cache hit. |
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393 | */ |
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394 | pccchip2->SCC_error = 0x01; |
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395 | pccchip2->SCC_modem_int_ctl = 0x10 | CD2401_INT_LEVEL; |
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396 | pccchip2->SCC_tx_int_ctl = 0x10 | CD2401_INT_LEVEL; |
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397 | pccchip2->SCC_rx_int_ctl = 0x50 | CD2401_INT_LEVEL; |
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398 | |
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399 | pccchip2->gen_control |= 0x02; /* Enable pccchip2 interrupts */ |
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400 | } |
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401 | else { |
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402 | /* Disable interrupts */ |
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403 | pccchip2->SCC_modem_int_ctl &= 0xEF; |
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404 | pccchip2->SCC_tx_int_ctl &= 0xEF; |
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405 | pccchip2->SCC_rx_int_ctl &= 0xEF; |
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406 | } |
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407 | } |
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408 | |
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409 | |
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410 | /* ISRs */ |
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411 | |
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412 | /* |
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413 | * cd2401_modem_isr |
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414 | * |
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415 | * Modem/timer interrupt (group 1) from CD2401. These are not used, and not |
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416 | * expected. Record as spurious and clear. |
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417 | * |
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418 | * Input parameters: |
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419 | * vector - vector number |
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420 | * |
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421 | * Output parameters: NONE |
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422 | * |
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423 | * Return values: NONE |
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424 | */ |
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425 | rtems_isr cd2401_modem_isr( |
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426 | rtems_vector_number vector |
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427 | ) |
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428 | { |
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429 | rtems_unsigned8 ch; |
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430 | |
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431 | /* Get interrupting channel ID */ |
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432 | ch = cd2401->licr >> 2; |
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433 | |
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434 | /* Record interrupt info for debugging */ |
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435 | CD2401_Channel_Info[ch].spur_dev = |
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436 | (vector << 24) | (cd2401->stk << 16) | (cd2401->mir << 8) | cd2401->misr; |
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437 | CD2401_Channel_Info[ch].spur_cnt++; |
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438 | |
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439 | cd2401->meoir = 0; /* EOI */ |
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440 | } |
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441 | |
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442 | |
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443 | /* |
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444 | * cd2401_re_isr |
---|
445 | * |
---|
446 | * RX exception interrupt (group 3, receiver exception) from CD2401. These are |
---|
447 | * not used, and not expected. Record as spurious and clear. |
---|
448 | * |
---|
449 | * FIX THIS ISR TO DETECT BREAK CONDITIONS AND RAISE SIGINT |
---|
450 | * |
---|
451 | * Input parameters: |
---|
452 | * vector - vector number |
---|
453 | * |
---|
454 | * Output parameters: NONE |
---|
455 | * |
---|
456 | * Return values: NONE |
---|
457 | */ |
---|
458 | rtems_isr cd2401_re_isr( |
---|
459 | rtems_vector_number vector |
---|
460 | ) |
---|
461 | { |
---|
462 | rtems_unsigned8 ch; |
---|
463 | |
---|
464 | /* Get interrupting channel ID */ |
---|
465 | ch = cd2401->licr >> 2; |
---|
466 | |
---|
467 | /* Record interrupt info for debugging */ |
---|
468 | CD2401_Channel_Info[ch].spur_dev = |
---|
469 | (vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl; |
---|
470 | CD2401_Channel_Info[ch].spur_cnt++; |
---|
471 | |
---|
472 | if ( cd2401->u5.b.risrl & 0x80 ) /* Timeout interrupt? */ |
---|
473 | cd2401->ier &= 0xDF; /* Disable rx timeout interrupt */ |
---|
474 | cd2401->reoir = 0x08; /* EOI; exception char not read */ |
---|
475 | } |
---|
476 | |
---|
477 | |
---|
478 | /* |
---|
479 | * cd2401_rx_isr |
---|
480 | * |
---|
481 | * RX interrupt (group 3, receiver data) from CD2401. |
---|
482 | * |
---|
483 | * Input parameters: |
---|
484 | * vector - vector number |
---|
485 | * |
---|
486 | * Output parameters: NONE |
---|
487 | * |
---|
488 | * Return values: NONE |
---|
489 | */ |
---|
490 | rtems_isr cd2401_rx_isr( |
---|
491 | rtems_vector_number vector |
---|
492 | ) |
---|
493 | { |
---|
494 | char c; |
---|
495 | rtems_unsigned8 ch, nchars; |
---|
496 | |
---|
497 | ch = cd2401->licr >> 2; |
---|
498 | |
---|
499 | /* Has this channel been initialized? */ |
---|
500 | if (CD2401_Channel_Info[ch].tty) { |
---|
501 | /* Yes, read chars, enqueue them, and issue EOI */ |
---|
502 | nchars = cd2401->rfoc; /* Number of chars to retrieve from rx FIFO */ |
---|
503 | while ( nchars-- > 0 ) { |
---|
504 | c = (char)cd2401->dr; /* Next char in rx FIFO */ |
---|
505 | rtems_termios_enqueue_raw_characters ( |
---|
506 | CD2401_Channel_Info[ch].tty, |
---|
507 | &c, |
---|
508 | 1 ); |
---|
509 | } |
---|
510 | cd2401->reoir = 0; /* EOI */ |
---|
511 | } else { |
---|
512 | /* No, record as spurious interrupt */ |
---|
513 | CD2401_Channel_Info[ch].spur_dev = |
---|
514 | (vector << 24) | (cd2401->stk << 16) | (cd2401->rir << 8) | cd2401->u5.b.risrl; |
---|
515 | CD2401_Channel_Info[ch].spur_cnt++; |
---|
516 | cd2401->reoir = 0x04; /* EOI - character not read */ |
---|
517 | } |
---|
518 | } |
---|
519 | |
---|
520 | |
---|
521 | /* |
---|
522 | * cd2401_tx_isr |
---|
523 | * |
---|
524 | * TX interrupt (group 2) from CD2401. |
---|
525 | * |
---|
526 | * Input parameters: |
---|
527 | * vector - vector number |
---|
528 | * |
---|
529 | * Output parameters: NONE |
---|
530 | * |
---|
531 | * Return values: NONE |
---|
532 | */ |
---|
533 | rtems_isr cd2401_tx_isr( |
---|
534 | rtems_vector_number vector |
---|
535 | ) |
---|
536 | { |
---|
537 | rtems_unsigned8 ch, status, buserr; |
---|
538 | |
---|
539 | status = cd2401->tisr; |
---|
540 | ch = cd2401->licr >> 2; |
---|
541 | |
---|
542 | /* Has this channel been initialized? */ |
---|
543 | if ( !CD2401_Channel_Info[ch].tty ) { |
---|
544 | /* No, record as spurious interrupt */ |
---|
545 | CD2401_Channel_Info[ch].spur_dev = |
---|
546 | (vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr; |
---|
547 | CD2401_Channel_Info[ch].spur_cnt++; |
---|
548 | cd2401->ier &= 0xFC; /* Shut up, whoever you are */ |
---|
549 | cd2401->teoir = 0x88; /* EOI - Terminate buffer and no transfer */ |
---|
550 | return; |
---|
551 | } |
---|
552 | |
---|
553 | if ( status & 0x80 ) { |
---|
554 | /* |
---|
555 | * Bus error occurred during DMA transfer. For now, just record. |
---|
556 | * Get reason for DMA bus error and clear the report for the next occurrence |
---|
557 | */ |
---|
558 | buserr = pccchip2->SCC_error; |
---|
559 | pccchip2->SCC_error = 0x01; |
---|
560 | CD2401_Channel_Info[ch].buserr_type = |
---|
561 | (vector << 24) | (buserr << 16) | (cd2401->tir << 8) | cd2401->tisr; |
---|
562 | CD2401_Channel_Info[ch].buserr_addr = |
---|
563 | (((rtems_unsigned32)cd2401->tcbadru) << 16) | cd2401->tcbadrl; |
---|
564 | |
---|
565 | cd2401->teoir = 0x80; /* EOI - terminate bad buffer */ |
---|
566 | return; |
---|
567 | } |
---|
568 | |
---|
569 | if ( status & 0x20 ) { |
---|
570 | /* DMA done */ |
---|
571 | cd2401->ier &= 0xFC; /* Shut up the interrupts */ |
---|
572 | |
---|
573 | /* This call can result in a call to cd2401_write() */ |
---|
574 | rtems_termios_dequeue_characters ( |
---|
575 | CD2401_Channel_Info[ch].tty, |
---|
576 | CD2401_Channel_Info[ch].len ); |
---|
577 | cd2401->teoir = 0x08; /* EOI - no data transfered */ |
---|
578 | } |
---|
579 | else { |
---|
580 | /* Why did we get a Tx interrupt? */ |
---|
581 | CD2401_Channel_Info[ch].spur_dev = |
---|
582 | (vector << 24) | (cd2401->stk << 16) | (cd2401->tir << 8) | cd2401->tisr; |
---|
583 | CD2401_Channel_Info[ch].spur_cnt++; |
---|
584 | cd2401->teoir = 0x08; /* EOI - no data transfered */ |
---|
585 | } |
---|
586 | } |
---|
587 | |
---|
588 | |
---|
589 | /* |
---|
590 | * termios callbacks |
---|
591 | */ |
---|
592 | |
---|
593 | /* |
---|
594 | * cd2401_firstOpen |
---|
595 | * |
---|
596 | * This is the first time that this minor device (channel) is opened. |
---|
597 | * Complete the asynchronous initialization. |
---|
598 | * |
---|
599 | * Input parameters: |
---|
600 | * major - device major number |
---|
601 | * minor - channel number |
---|
602 | * arg - pointer to a struct rtems_libio_open_close_args_t |
---|
603 | * |
---|
604 | * Output parameters: NONE |
---|
605 | * |
---|
606 | * Return value: IGNORED |
---|
607 | */ |
---|
608 | int cd2401_firstOpen( |
---|
609 | int major, |
---|
610 | int minor, |
---|
611 | void *arg |
---|
612 | ) |
---|
613 | { |
---|
614 | rtems_libio_open_close_args_t *args = arg; |
---|
615 | rtems_libio_ioctl_args_t newarg; |
---|
616 | struct termios termios; |
---|
617 | rtems_status_code sc; |
---|
618 | |
---|
619 | /* |
---|
620 | * Set up the line with the specified parameters. The difficulty is that |
---|
621 | * the line parameters are stored in the struct termios field of a |
---|
622 | * struct rtems_termios_tty that is not defined in a public header file. |
---|
623 | * Therefore, we do not have direct access to the termios passed in with |
---|
624 | * arg. So we make a rtems_termios_ioctl() call to get a pointer to the |
---|
625 | * termios structure. |
---|
626 | * |
---|
627 | * THIS KLUDGE MAY BREAK IN THE FUTURE! |
---|
628 | * |
---|
629 | * We could have made a tcgetattr() call if we had our fd. |
---|
630 | */ |
---|
631 | newarg.iop = args->iop; |
---|
632 | newarg.command = RTEMS_IO_GET_ATTRIBUTES; |
---|
633 | newarg.buffer = &termios; |
---|
634 | sc = rtems_termios_ioctl (&newarg); |
---|
635 | if (sc != RTEMS_SUCCESSFUL) |
---|
636 | rtems_fatal_error_occurred (sc); |
---|
637 | |
---|
638 | /* |
---|
639 | * Turn off hardware flow control. It is a pain with 3-wire cables. |
---|
640 | * The rtems_termios_ioctl() call below results in a call to |
---|
641 | * cd2401_setAttributes to initialize the line. The caller will "wait" |
---|
642 | * on the ttyMutex that it already owns; this is safe in RTEMS. |
---|
643 | */ |
---|
644 | termios.c_cflag |= CLOCAL; /* Ignore modem status lines */ |
---|
645 | newarg.command = RTEMS_IO_SET_ATTRIBUTES; |
---|
646 | sc = rtems_termios_ioctl (&newarg); |
---|
647 | if (sc != RTEMS_SUCCESSFUL) |
---|
648 | rtems_fatal_error_occurred (sc); |
---|
649 | |
---|
650 | /* Mark that the channel as initialized */ |
---|
651 | CD2401_Channel_Info[minor].tty = args->iop->data1; |
---|
652 | |
---|
653 | /* If the first of the four channels to open, set up the interrupts */ |
---|
654 | if ( !Init_count++ ) { |
---|
655 | /* Install the interrupt handlers */ |
---|
656 | Prev_re_isr = (rtems_isr_entry) set_vector( cd2401_re_isr, 0x5C, 1 ); |
---|
657 | Prev_modem_isr = (rtems_isr_entry) set_vector( cd2401_modem_isr, 0x5D, 1 ); |
---|
658 | Prev_tx_isr = (rtems_isr_entry) set_vector( cd2401_tx_isr, 0x5E, 1 ); |
---|
659 | Prev_rx_isr = (rtems_isr_entry) set_vector( cd2401_rx_isr, 0x5F, 1 ); |
---|
660 | |
---|
661 | cd2401_interrupts_initialize( TRUE ); |
---|
662 | } |
---|
663 | |
---|
664 | /* Return something */ |
---|
665 | return RTEMS_SUCCESSFUL; |
---|
666 | } |
---|
667 | |
---|
668 | |
---|
669 | /* |
---|
670 | * cd2401_lastClose |
---|
671 | * |
---|
672 | * There are no more opened file descriptors to this device. Close it down. |
---|
673 | * |
---|
674 | * Input parameters: |
---|
675 | * major - device major number |
---|
676 | * minor - channel number |
---|
677 | * arg - pointer to a struct rtems_libio_open_close_args_t |
---|
678 | */ |
---|
679 | int cd2401_lastClose( |
---|
680 | int major, |
---|
681 | int minor, |
---|
682 | void *arg |
---|
683 | ) |
---|
684 | { |
---|
685 | /* Mark that the channel is no longer is use */ |
---|
686 | CD2401_Channel_Info[minor].tty = NULL; |
---|
687 | |
---|
688 | /* If the last of the four channels to close, disable the interrupts */ |
---|
689 | if ( !--Init_count ) { |
---|
690 | cd2401_interrupts_initialize( FALSE ); |
---|
691 | |
---|
692 | /* De-install the interrupt handlers */ |
---|
693 | set_vector( Prev_re_isr, 0x5C, 1 ); |
---|
694 | set_vector( Prev_modem_isr, 0x5D, 1 ); |
---|
695 | set_vector( Prev_tx_isr, 0x5E, 1 ); |
---|
696 | set_vector( Prev_rx_isr, 0x5F, 1 ); |
---|
697 | } |
---|
698 | |
---|
699 | /* return something */ |
---|
700 | return RTEMS_SUCCESSFUL; |
---|
701 | } |
---|
702 | |
---|
703 | |
---|
704 | /* |
---|
705 | * cd2401_setAttributes |
---|
706 | * |
---|
707 | * Set up the selected channel of the CD2401 chip for doing asynchronous |
---|
708 | * I/O with DMA. |
---|
709 | * |
---|
710 | * The chip must already have been initialized by cd2401_initialize(). |
---|
711 | * |
---|
712 | * This code was written for clarity. The code space it occupies could be |
---|
713 | * reduced. The code could also be compiled with aggressive optimization |
---|
714 | * turned on. |
---|
715 | * |
---|
716 | * Input parameters: |
---|
717 | * minor - the selected channel |
---|
718 | * t - the termios parameters |
---|
719 | * |
---|
720 | * Output parameters: NONE |
---|
721 | * |
---|
722 | * Return value: IGNORED |
---|
723 | */ |
---|
724 | int cd2401_setAttributes( |
---|
725 | int minor, |
---|
726 | const struct termios *t |
---|
727 | ) |
---|
728 | { |
---|
729 | rtems_unsigned8 csize, cstopb, parodd, parenb, ignpar, inpck; |
---|
730 | rtems_unsigned8 hw_flow_ctl, sw_flow_ctl, extra_flow_ctl; |
---|
731 | rtems_unsigned8 icrnl, igncr, inlcr, brkint, ignbrk, parmrk, istrip; |
---|
732 | rtems_unsigned16 tx_period, rx_period; |
---|
733 | rtems_unsigned32 out_baud, in_baud; |
---|
734 | |
---|
735 | /* Set up the line parameters */ |
---|
736 | |
---|
737 | /* Output baud rate */ |
---|
738 | switch ( cfgetospeed (t) ) { |
---|
739 | default: out_baud = 9600; break; |
---|
740 | case B50: out_baud = 50; break; |
---|
741 | case B75: out_baud = 75; break; |
---|
742 | case B110: out_baud = 110; break; |
---|
743 | case B134: out_baud = 134; break; |
---|
744 | case B150: out_baud = 150; break; |
---|
745 | case B200: out_baud = 200; break; |
---|
746 | case B300: out_baud = 300; break; |
---|
747 | case B600: out_baud = 600; break; |
---|
748 | case B1200: out_baud = 1200; break; |
---|
749 | case B1800: out_baud = 1800; break; |
---|
750 | case B2400: out_baud = 2400; break; |
---|
751 | case B4800: out_baud = 4800; break; |
---|
752 | case B9600: out_baud = 9600; break; |
---|
753 | case B19200: out_baud = 19200; break; |
---|
754 | case B38400: out_baud = 38400; break; |
---|
755 | case B57600: out_baud = 57600; break; |
---|
756 | case B115200: out_baud = 115200; break; |
---|
757 | case B230400: out_baud = 230400; break; |
---|
758 | case B460800: out_baud = 460800; break; |
---|
759 | } |
---|
760 | |
---|
761 | /* Input baud rate */ |
---|
762 | switch ( cfgetispeed (t) ) { |
---|
763 | default: in_baud = out_baud; break; |
---|
764 | case B50: in_baud = 50; break; |
---|
765 | case B75: in_baud = 75; break; |
---|
766 | case B110: in_baud = 110; break; |
---|
767 | case B134: in_baud = 134; break; |
---|
768 | case B150: in_baud = 150; break; |
---|
769 | case B200: in_baud = 200; break; |
---|
770 | case B300: in_baud = 300; break; |
---|
771 | case B600: in_baud = 600; break; |
---|
772 | case B1200: in_baud = 1200; break; |
---|
773 | case B1800: in_baud = 1800; break; |
---|
774 | case B2400: in_baud = 2400; break; |
---|
775 | case B4800: in_baud = 4800; break; |
---|
776 | case B9600: in_baud = 9600; break; |
---|
777 | case B19200: in_baud = 19200; break; |
---|
778 | case B38400: in_baud = 38400; break; |
---|
779 | case B57600: in_baud = 57600; break; |
---|
780 | case B115200: in_baud = 115200; break; |
---|
781 | case B230400: in_baud = 230400; break; |
---|
782 | case B460800: in_baud = 460800; break; |
---|
783 | } |
---|
784 | |
---|
785 | /* Number of bits per char */ |
---|
786 | switch ( t->c_cflag & CSIZE ) { |
---|
787 | case CS5: csize = 0x04; break; |
---|
788 | case CS6: csize = 0x05; break; |
---|
789 | case CS7: csize = 0x06; break; |
---|
790 | case CS8: csize = 0x07; break; |
---|
791 | } |
---|
792 | |
---|
793 | /* Parity */ |
---|
794 | if ( t->c_cflag & PARODD ) |
---|
795 | parodd = 0x80; /* Odd parity */ |
---|
796 | else |
---|
797 | parodd = 0; |
---|
798 | |
---|
799 | if ( t->c_cflag & PARENB ) |
---|
800 | parenb = 0x40; /* Parity enabled on Tx and Rx */ |
---|
801 | else |
---|
802 | parenb = 0x00; /* No parity on Tx and Rx */ |
---|
803 | |
---|
804 | /* CD2401 IGNPAR and INPCK bits are inverted wrt POSIX standard? */ |
---|
805 | if ( t->c_iflag & INPCK ) |
---|
806 | ignpar = 0; /* Check parity on input */ |
---|
807 | else |
---|
808 | ignpar = 0x10; /* Do not check parity on input */ |
---|
809 | if ( t->c_iflag & IGNPAR ) { |
---|
810 | inpck = 0x03; /* Discard error character */ |
---|
811 | parmrk = 0; |
---|
812 | } else { |
---|
813 | if ( t->c_iflag & PARMRK ) { |
---|
814 | inpck = 0x01; /* Translate to 0xFF 0x00 <char> */ |
---|
815 | parmrk = 0x04; |
---|
816 | } else { |
---|
817 | inpck = 0x01; /* Translate to 0x00 */ |
---|
818 | parmrk = 0; |
---|
819 | } |
---|
820 | } |
---|
821 | |
---|
822 | /* Stop bits */ |
---|
823 | if ( t->c_cflag & CSTOPB ) |
---|
824 | cstopb = 0x04; /* Two stop bits */ |
---|
825 | else |
---|
826 | cstopb = 0x02; /* One stop bit */ |
---|
827 | |
---|
828 | /* Modem flow control */ |
---|
829 | if ( t->c_cflag & CLOCAL ) |
---|
830 | hw_flow_ctl = 0x04; /* Always assert RTS before Tx */ |
---|
831 | else |
---|
832 | hw_flow_ctl = 0x07; /* Always assert RTS before Tx, |
---|
833 | wait for CTS and DSR */ |
---|
834 | |
---|
835 | /* XON/XOFF Tx flow control */ |
---|
836 | if ( t->c_iflag & IXON ) { |
---|
837 | sw_flow_ctl = 0x40; /* Tx in-band flow ctl enabled, wait for XON */ |
---|
838 | extra_flow_ctl = 0x30; /* Eat XON/XOFF, XON/XOFF in SCHR1, SCHR2 */ |
---|
839 | } |
---|
840 | else { |
---|
841 | sw_flow_ctl = 0; /* Tx in-band flow ctl disabled */ |
---|
842 | extra_flow_ctl = 0; /* Pass on XON/XOFF */ |
---|
843 | } |
---|
844 | |
---|
845 | /* CL/LF translation */ |
---|
846 | if ( t->c_iflag & ICRNL ) |
---|
847 | icrnl = 0x40; /* Map CR to NL on input */ |
---|
848 | else |
---|
849 | icrnl = 0; /* Pass on CR */ |
---|
850 | if ( t->c_iflag & INLCR ) |
---|
851 | inlcr = 0x20; /* Map NL to CR on input */ |
---|
852 | else |
---|
853 | inlcr = 0; /* Pass on NL */ |
---|
854 | if ( t->c_iflag & IGNCR ) |
---|
855 | igncr = 0x80; /* CR discarded on input */ |
---|
856 | else |
---|
857 | igncr = 0; |
---|
858 | |
---|
859 | /* Break handling */ |
---|
860 | if ( t->c_iflag & IGNBRK ) { |
---|
861 | ignbrk = 0x10; /* Ignore break on input */ |
---|
862 | brkint = 0x08; |
---|
863 | } else { |
---|
864 | if ( t->c_iflag & BRKINT ) { |
---|
865 | ignbrk = 0; /* Generate SIGINT (interrupt ) */ |
---|
866 | brkint = 0; |
---|
867 | } else { |
---|
868 | ignbrk = 0; /* Convert to 0x00 */ |
---|
869 | brkint = 0x08; |
---|
870 | } |
---|
871 | } |
---|
872 | |
---|
873 | /* Stripping */ |
---|
874 | if ( t->c_iflag & ISTRIP ) |
---|
875 | istrip = 0x80; /* Strip to 7 bits */ |
---|
876 | else |
---|
877 | istrip = 0; /* Leave as 8 bits */ |
---|
878 | |
---|
879 | |
---|
880 | /* Clear channel and disable rx and tx */ |
---|
881 | cd2401_chan_cmd (minor, 0x40, 1); |
---|
882 | |
---|
883 | /* Write to the ports */ |
---|
884 | cd2401->car = minor; /* Select channel */ |
---|
885 | cd2401->cmr = 0x42; /* Interrupt Rx, DMA Tx, async mode */ |
---|
886 | cd2401->cor1 = parodd | parenb | ignpar | csize; |
---|
887 | cd2401->cor2 = sw_flow_ctl | hw_flow_ctl; |
---|
888 | cd2401->cor3 = extra_flow_ctl | cstopb; |
---|
889 | cd2401->cor4 = 0x0A; /* No DSR/DCD/CTS detect; FIFO threshold of 10 */ |
---|
890 | cd2401->cor5 = 0x0A; /* No DSR/DCD/CTS detect; DTR threshold of 10 */ |
---|
891 | cd2401->cor6 = igncr | icrnl | inlcr | ignbrk | brkint | parmrk | inpck; |
---|
892 | cd2401->cor7 = istrip; /* No LNext; ignore XON/XOFF if frame error; no tx translations */ |
---|
893 | cd2401->u1.async.schr1 = |
---|
894 | t->c_cc[VSTART]; /* Special char 1: XON character */ |
---|
895 | cd2401->u1.async.schr2 = |
---|
896 | t->c_cc[VSTOP]; /* special char 2: XOFF character */ |
---|
897 | /* Special chars 3 and 4, char range, LNext, RFAR[1..4] and CRC are unused, left as is. */ |
---|
898 | |
---|
899 | /* Set baudrates for receiver and transmitter */ |
---|
900 | rx_period = cd2401_bitrate_divisor( 20000000Ul, &in_baud ); |
---|
901 | cd2401->rbpr = (unsigned char)rx_period; |
---|
902 | cd2401->rcor = (unsigned char)(rx_period >> 8); /* no DPLL */ |
---|
903 | tx_period = cd2401_bitrate_divisor( 20000000Ul, &out_baud ); |
---|
904 | cd2401->tbpr = (unsigned char)tx_period; |
---|
905 | cd2401->tcor = (tx_period >> 3) & 0xE0; /* no x1 ext clk, no loopback */ |
---|
906 | |
---|
907 | /* NEED TO LOOK AT THIS LINE! */ |
---|
908 | /* Timeout for 4 chars at 9600, 8 bits per char, 1 stop bit */ |
---|
909 | cd2401->u2.w.rtpr = 0x04; |
---|
910 | |
---|
911 | /* And finally: */ |
---|
912 | if ( t->c_cflag & CREAD ) { |
---|
913 | /* Re-initialize channel, enable rx and tx */ |
---|
914 | cd2401_chan_cmd (minor, 0x2A, 1); |
---|
915 | /* Enable rx data ints */ |
---|
916 | cd2401->ier = 0x08; |
---|
917 | } else { |
---|
918 | /* Re-initialize channel, enable tx, disable rx */ |
---|
919 | cd2401_chan_cmd (minor, 0x29, 1); |
---|
920 | } |
---|
921 | |
---|
922 | /* Return something */ |
---|
923 | return RTEMS_SUCCESSFUL; |
---|
924 | } |
---|
925 | |
---|
926 | |
---|
927 | /* |
---|
928 | * cd2401_startRemoreTx |
---|
929 | * |
---|
930 | * Defined as a callback, but it would appear that it is never called. The |
---|
931 | * POSIX standard states that when the tcflow() function is called with the |
---|
932 | * TCION action, the system wall transmit a START character. Presumably, |
---|
933 | * tcflow() is called internally when IXOFF is set in the termios c_iflag |
---|
934 | * field when the input buffer can accomodate enough characters. It should |
---|
935 | * probably be called from fillBufferQueue(). Clearly, the function is also |
---|
936 | * explicitly callable by user code. The action is clearly to send the START |
---|
937 | * character, regardless of whether START/STOP flow control is in effect. |
---|
938 | * |
---|
939 | * Input parameters: |
---|
940 | * minor - selected channel |
---|
941 | * |
---|
942 | * Output parameters: NONE |
---|
943 | * |
---|
944 | * Return value: IGNORED |
---|
945 | * |
---|
946 | * PROPER START CHARACTER MUST BE PROGRAMMED IN SCHR1. |
---|
947 | */ |
---|
948 | int cd2401_startRemoteTx( |
---|
949 | int minor |
---|
950 | ) |
---|
951 | { |
---|
952 | cd2401->car = minor; /* Select channel */ |
---|
953 | cd2401->stcr = 0x01; /* Send SCHR1 ahead of chars in FIFO */ |
---|
954 | |
---|
955 | /* Return something */ |
---|
956 | return RTEMS_SUCCESSFUL; |
---|
957 | } |
---|
958 | |
---|
959 | |
---|
960 | /* |
---|
961 | * cd2401_stopRemoreTx |
---|
962 | * |
---|
963 | * Defined as a callback, but it would appear that it is never called. The |
---|
964 | * POSIX standard states that when the tcflow() function is called with the |
---|
965 | * TCIOFF function, the system wall transmit a STOP character. Presumably, |
---|
966 | * tcflow() is called internally when IXOFF is set in the termios c_iflag |
---|
967 | * field as the input buffer is about to overflow. It should probably be |
---|
968 | * called from rtems_termios_enqueue_raw_characters(). Clearly, the function |
---|
969 | * is also explicitly callable by user code. The action is clearly to send |
---|
970 | * the STOP character, regardless of whether START/STOP flow control is in |
---|
971 | * effect. |
---|
972 | * |
---|
973 | * Input parameters: |
---|
974 | * minor - selected channel |
---|
975 | * |
---|
976 | * Output parameters: NONE |
---|
977 | * |
---|
978 | * Return value: IGNORED |
---|
979 | * |
---|
980 | * PROPER STOP CHARACTER MUST BE PROGRAMMED IN SCHR2. |
---|
981 | */ |
---|
982 | int cd2401_stopRemoteTx( |
---|
983 | int minor |
---|
984 | ) |
---|
985 | { |
---|
986 | cd2401->car = minor; /* Select channel */ |
---|
987 | cd2401->stcr = 0x02; /* Send SCHR2 ahead of chars in FIFO */ |
---|
988 | |
---|
989 | /* Return something */ |
---|
990 | return RTEMS_SUCCESSFUL; |
---|
991 | } |
---|
992 | |
---|
993 | |
---|
994 | /* |
---|
995 | * cd2401_write |
---|
996 | * |
---|
997 | * Initiate DMA output. Termios guarantees that the buffer does not wrap |
---|
998 | * around, so we can do DMA strait from the supplied buffer. |
---|
999 | * |
---|
1000 | * Input parameters: |
---|
1001 | * minor - selected channel |
---|
1002 | * buf - output buffer |
---|
1003 | * len - number of chars to output |
---|
1004 | * |
---|
1005 | * Output parameters: NONE |
---|
1006 | * |
---|
1007 | * Return value: IGNORED |
---|
1008 | * |
---|
1009 | * MUST BE EXECUTED WITH THE CD2401 INTERRUPTS DISABLED! |
---|
1010 | * The processor is placed at interrupt level CD2401_INT_LEVEL explicitly in |
---|
1011 | * console_write(). The processor is necessarily at interrupt level 1 in |
---|
1012 | * cd2401_tx_isr(). |
---|
1013 | */ |
---|
1014 | int cd2401_write( |
---|
1015 | int minor, |
---|
1016 | const char *buf, |
---|
1017 | int len |
---|
1018 | ) |
---|
1019 | { |
---|
1020 | cd2401->car = minor; /* Select channel */ |
---|
1021 | |
---|
1022 | if ( (cd2401->dmabsts & 0x08) == 0 ) { |
---|
1023 | /* Next buffer is A. Wait for it to be ours. */ |
---|
1024 | if ( cd2401->atbsts & 0x01 ) { |
---|
1025 | CD2401_Channel_Info[minor].wait_buf_A++; |
---|
1026 | while ( cd2401->atbsts & 0x01 ); |
---|
1027 | } |
---|
1028 | CD2401_Channel_Info[minor].used_buf_A++; |
---|
1029 | CD2401_Channel_Info[minor].len = len; |
---|
1030 | CD2401_Channel_Info[minor].buf = buf; |
---|
1031 | cd2401->atbadru = (rtems_unsigned16)( ( (rtems_unsigned32) buf ) >> 16 ); |
---|
1032 | cd2401->atbadrl = (rtems_unsigned16)( (rtems_unsigned32) buf ); |
---|
1033 | cd2401->atbcnt = len; |
---|
1034 | cd2401->atbsts = 0x03; /* CD2401 owns buffer, int when empty */ |
---|
1035 | } |
---|
1036 | else { |
---|
1037 | /* Next buffer is B. Wait for it to be ours. */ |
---|
1038 | if ( cd2401->btbsts & 0x01 ) { |
---|
1039 | CD2401_Channel_Info[minor].wait_buf_B++; |
---|
1040 | while ( cd2401->btbsts & 0x01 ); |
---|
1041 | } |
---|
1042 | CD2401_Channel_Info[minor].used_buf_B++; |
---|
1043 | CD2401_Channel_Info[minor].len = len; |
---|
1044 | CD2401_Channel_Info[minor].buf = buf; |
---|
1045 | cd2401->btbadru = (rtems_unsigned16)( ( (rtems_unsigned32) buf ) >> 16 ); |
---|
1046 | cd2401->btbadrl = (rtems_unsigned16)( (rtems_unsigned32) buf ); |
---|
1047 | cd2401->btbcnt = len; |
---|
1048 | cd2401->btbsts = 0x03; /* CD2401 owns buffer, int when empty */ |
---|
1049 | } |
---|
1050 | /* Should TxD interrupts be enabled before I set up the DMA transfer? */ |
---|
1051 | cd2401->ier |= 0x01; /* enable TxD ints */ |
---|
1052 | |
---|
1053 | /* Return something */ |
---|
1054 | return RTEMS_SUCCESSFUL; |
---|
1055 | } |
---|
1056 | |
---|
1057 | |
---|
1058 | /* |
---|
1059 | * _167Bug_pollRead |
---|
1060 | * |
---|
1061 | * Read a character from the 167Bug console, and return it. Return -1 |
---|
1062 | * if there is no character in the input FIFO. |
---|
1063 | * |
---|
1064 | * Input parameters: |
---|
1065 | * minor - selected channel |
---|
1066 | * |
---|
1067 | * Output parameters: NONE |
---|
1068 | * |
---|
1069 | * Return value: char returned as positive signed int |
---|
1070 | * -1 if no character is present in the input FIFO. |
---|
1071 | * |
---|
1072 | * CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O! |
---|
1073 | * This function is invoked when the device driver is compiled with |
---|
1074 | * CD2401_POLLED_IO set to 1 above. All I/O is then done through 167Bug. |
---|
1075 | */ |
---|
1076 | int _167Bug_pollRead( |
---|
1077 | int minor |
---|
1078 | ) |
---|
1079 | { |
---|
1080 | int char_not_available; |
---|
1081 | unsigned char c; |
---|
1082 | |
---|
1083 | /* Check for a char in the input FIFO */ |
---|
1084 | asm volatile( "trap #15 /* Trap to 167Bug (.INSTAT) */ |
---|
1085 | .short 0x01 |
---|
1086 | move %%cc, %0 /* Get condition codes */ |
---|
1087 | andil #4, %0" |
---|
1088 | : "=d" (char_not_available) :: "%%cc" ); |
---|
1089 | |
---|
1090 | if (char_not_available) |
---|
1091 | return -1; |
---|
1092 | |
---|
1093 | /* Read the char and return it */ |
---|
1094 | asm volatile( "subq.l #2,%%a7 /* Space for result */ |
---|
1095 | trap #15 /* Trap to 167 Bug (.INCHR) */ |
---|
1096 | .short 0x00 |
---|
1097 | moveb (%%a7)+, %0" |
---|
1098 | : "=d" (c) ); |
---|
1099 | |
---|
1100 | return (int)c; |
---|
1101 | } |
---|
1102 | |
---|
1103 | |
---|
1104 | /* |
---|
1105 | * _167Bug_pollWrite |
---|
1106 | * |
---|
1107 | * Output buffer through 167Bug. Returns only once every character has been |
---|
1108 | * sent (polled output). |
---|
1109 | * |
---|
1110 | * Input parameters: |
---|
1111 | * minor - selected channel |
---|
1112 | * buf - output buffer |
---|
1113 | * len - number of chars to output |
---|
1114 | * |
---|
1115 | * Output parameters: NONE |
---|
1116 | * |
---|
1117 | * Return value: IGNORED |
---|
1118 | * |
---|
1119 | * CANNOT BE COMBINED WITH INTERRUPT DRIVEN I/O! |
---|
1120 | * This function is invoked when the device driver is compiled with |
---|
1121 | * CD2401_POLLED_IO set to 1 above. All I/O is then done through 167Bug. |
---|
1122 | */ |
---|
1123 | int _167Bug_pollWrite( |
---|
1124 | int minor, |
---|
1125 | const char *buf, |
---|
1126 | int len |
---|
1127 | ) |
---|
1128 | { |
---|
1129 | const char *endbuf = buf + len; |
---|
1130 | |
---|
1131 | asm volatile( "pea (%0) |
---|
1132 | pea (%1) |
---|
1133 | trap #15 /* trap to 167Bug (.OUTSTR) */ |
---|
1134 | .short 0x21" |
---|
1135 | :: "a" (endbuf), "a" (buf) ); |
---|
1136 | |
---|
1137 | /* Return something */ |
---|
1138 | return RTEMS_SUCCESSFUL; |
---|
1139 | } |
---|
1140 | |
---|
1141 | |
---|
1142 | /* |
---|
1143 | *************** |
---|
1144 | * BOILERPLATE * |
---|
1145 | *************** |
---|
1146 | * |
---|
1147 | * All these functions are prototyped in rtems/c/src/lib/include/console.h, |
---|
1148 | * except console_reserve_resources(), which is prototyped in |
---|
1149 | * rtems/c/src/lib/libbsp/m68k/mvme167/include/bsp.h |
---|
1150 | */ |
---|
1151 | |
---|
1152 | /* |
---|
1153 | * Reserve resources consumed by this driver. Allocate enough space in the |
---|
1154 | * object table to hold semaphores for 4 minor devices. |
---|
1155 | */ |
---|
1156 | void console_reserve_resources( |
---|
1157 | rtems_configuration_table *configuration |
---|
1158 | ) |
---|
1159 | { |
---|
1160 | rtems_termios_reserve_resources (configuration, 4); |
---|
1161 | } |
---|
1162 | |
---|
1163 | /* |
---|
1164 | * Initialize and register the device |
---|
1165 | */ |
---|
1166 | rtems_device_driver console_initialize( |
---|
1167 | rtems_device_major_number major, |
---|
1168 | rtems_device_minor_number minor, |
---|
1169 | void *arg |
---|
1170 | ) |
---|
1171 | { |
---|
1172 | rtems_status_code status; |
---|
1173 | |
---|
1174 | /* |
---|
1175 | * Set up TERMIOS |
---|
1176 | */ |
---|
1177 | rtems_termios_initialize (); |
---|
1178 | |
---|
1179 | /* |
---|
1180 | * Do device-specific initialization |
---|
1181 | */ |
---|
1182 | cd2401_initialize (); |
---|
1183 | |
---|
1184 | /* |
---|
1185 | * Register the devices |
---|
1186 | */ |
---|
1187 | status = rtems_io_register_name ("/dev/tty0", major, 0); |
---|
1188 | if (status != RTEMS_SUCCESSFUL) |
---|
1189 | rtems_fatal_error_occurred (status); |
---|
1190 | |
---|
1191 | status = rtems_io_register_name ("/dev/tty1", major, 1); |
---|
1192 | if (status != RTEMS_SUCCESSFUL) |
---|
1193 | rtems_fatal_error_occurred (status); |
---|
1194 | |
---|
1195 | status = rtems_io_register_name ("/dev/console", major, 1); |
---|
1196 | if (status != RTEMS_SUCCESSFUL) |
---|
1197 | rtems_fatal_error_occurred (status); |
---|
1198 | |
---|
1199 | status = rtems_io_register_name ("/dev/tty2", major, 2); |
---|
1200 | if (status != RTEMS_SUCCESSFUL) |
---|
1201 | rtems_fatal_error_occurred (status); |
---|
1202 | |
---|
1203 | status = rtems_io_register_name ("/dev/tty3", major, 3); |
---|
1204 | if (status != RTEMS_SUCCESSFUL) |
---|
1205 | rtems_fatal_error_occurred (status); |
---|
1206 | |
---|
1207 | return RTEMS_SUCCESSFUL; |
---|
1208 | } |
---|
1209 | |
---|
1210 | /* |
---|
1211 | * Open the device |
---|
1212 | */ |
---|
1213 | rtems_device_driver console_open( |
---|
1214 | rtems_device_major_number major, |
---|
1215 | rtems_device_minor_number minor, |
---|
1216 | void * arg |
---|
1217 | ) |
---|
1218 | { |
---|
1219 | #if CD2401_POLLED_IO |
---|
1220 | |
---|
1221 | /* I/O is limited to 167Bug console. minor is ignored! */ |
---|
1222 | static const rtems_termios_callbacks callbacks = { |
---|
1223 | NULL, /* firstOpen */ |
---|
1224 | NULL, /* lastClose */ |
---|
1225 | _167Bug_pollRead, /* pollRead */ |
---|
1226 | _167Bug_pollWrite, /* write */ |
---|
1227 | NULL, /* setAttributes */ |
---|
1228 | NULL, /* stopRemoteTx */ |
---|
1229 | NULL, /* startRemoteTx */ |
---|
1230 | 0 /* outputUsesInterrupts */ |
---|
1231 | }; |
---|
1232 | |
---|
1233 | #else |
---|
1234 | |
---|
1235 | static const rtems_termios_callbacks callbacks = { |
---|
1236 | cd2401_firstOpen, /* firstOpen */ |
---|
1237 | cd2401_lastClose, /* lastClose */ |
---|
1238 | NULL, /* pollRead */ |
---|
1239 | cd2401_write, /* write */ |
---|
1240 | cd2401_setAttributes, /* setAttributes */ |
---|
1241 | cd2401_stopRemoteTx, /* stopRemoteTx */ |
---|
1242 | cd2401_startRemoteTx, /* startRemoteTx */ |
---|
1243 | 1 /* outputUsesInterrupts */ |
---|
1244 | }; |
---|
1245 | |
---|
1246 | #endif |
---|
1247 | |
---|
1248 | return rtems_termios_open (major, minor, arg, &callbacks); |
---|
1249 | } |
---|
1250 | |
---|
1251 | /* |
---|
1252 | * Close the device |
---|
1253 | */ |
---|
1254 | rtems_device_driver console_close( |
---|
1255 | rtems_device_major_number major, |
---|
1256 | rtems_device_minor_number minor, |
---|
1257 | void * arg |
---|
1258 | ) |
---|
1259 | { |
---|
1260 | return rtems_termios_close (arg); |
---|
1261 | } |
---|
1262 | |
---|
1263 | /* |
---|
1264 | * Read from the device |
---|
1265 | */ |
---|
1266 | rtems_device_driver console_read( |
---|
1267 | rtems_device_major_number major, |
---|
1268 | rtems_device_minor_number minor, |
---|
1269 | void * arg |
---|
1270 | ) |
---|
1271 | { |
---|
1272 | return rtems_termios_read (arg); |
---|
1273 | } |
---|
1274 | |
---|
1275 | /* |
---|
1276 | * Write to the device |
---|
1277 | */ |
---|
1278 | rtems_device_driver console_write( |
---|
1279 | rtems_device_major_number major, |
---|
1280 | rtems_device_minor_number minor, |
---|
1281 | void * arg |
---|
1282 | ) |
---|
1283 | { |
---|
1284 | return rtems_termios_write (arg); |
---|
1285 | } |
---|
1286 | |
---|
1287 | /* |
---|
1288 | * Handle ioctl request. |
---|
1289 | */ |
---|
1290 | rtems_device_driver console_control( |
---|
1291 | rtems_device_major_number major, |
---|
1292 | rtems_device_minor_number minor, |
---|
1293 | void * arg |
---|
1294 | ) |
---|
1295 | { |
---|
1296 | return rtems_termios_ioctl (arg); |
---|
1297 | } |
---|