[274fa77] | 1 | /***************************************************************************** |
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| 2 | * File: sci.c |
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| 3 | * |
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| 4 | * Desc: This file contains the console IO routines for the SCI port. |
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| 5 | * There are two interfaces in this module. One is for the rtems |
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| 6 | * termios/console code and the other is a device driver interface. |
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| 7 | * This module works together with the termio module which is |
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| 8 | * sometimes referred to as the "line disciplines" which implements |
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| 9 | * terminal i/o processing like tabs, backspaces, and newlines. |
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| 10 | * The rtems printf uses interrupt io and the rtems printk routine |
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| 11 | * uses polled io which is better for debugging. |
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| 12 | * |
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| 13 | * Index: Documentation |
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| 14 | * Section A - Include Files |
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| 15 | * Section B - Manifest Constants |
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| 16 | * Section C - External Data |
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| 17 | * Section D - External Functions |
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| 18 | * Section E - Local Functions |
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| 19 | * Section F - Local Variables |
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| 20 | * Section G - A circular data buffer for rcv chars |
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| 21 | * Section H - RTEMS termios callbacks for the interrupt api |
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| 22 | * Section I - RTEMS termios callbacks for the polled api |
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| 23 | |
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| 24 | * Section 0 - Miscellaneous routines |
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| 25 | * Section 1 - Routines to manipulate the circular buffer |
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| 26 | * Section 2 - Interrupt based entry points for the termios module |
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| 27 | * Section 3 - Polling based entry points for the termios module |
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| 28 | * Section 4 - Device driver public api entry points |
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| 29 | * Section 5 - Hardware level routines |
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| 30 | * Section 6 - Testing and debugging code |
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| 31 | * |
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| 32 | * Refer: Motorola QSM Reference Manual - Chapter 5 - SCI sub-module |
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| 33 | * |
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| 34 | * Note: See bsp.h,confdefs.h,system.h for installing drivers into RTEMS. |
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| 35 | * |
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| 36 | * $Id$ |
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| 37 | * |
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| 38 | *****************************************************************************/ |
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| 39 | |
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| 40 | /***************************************************************************** |
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| 41 | Overview of serial port console terminal input/output |
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| 42 | *****************************************************************************/ |
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| 43 | |
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| 44 | /* |
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| 45 | +-----------+ +---------+ |
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| 46 | | app | | app | |
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| 47 | +-----------+ +---------+ |
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| 48 | | | |
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| 49 | | (printf,scanf,etc.) | |
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| 50 | v | |
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| 51 | +-----------+ | |
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| 52 | | libc | | |
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| 53 | +-----------+ | |
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| 54 | | | |
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| 55 | | | |
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| 56 | | (open,close,read,write,ioctl) | |
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| 57 | ======|==========================================|======================== |
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| 58 | | /dev/console | /dev/sci |
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| 59 | | (stdin,stdout,stderr) | |
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| 60 | ======|==========================================|======================== |
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| 61 | | | |
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| 62 | | | |
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| 63 | v v |
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| 64 | +-----------+ +-----------+ +---------+ |
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| 65 | | console | <---> | termios | <---> | sci | |
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| 66 | | driver | | module | | driver | |
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| 67 | +-----------+ +-----------+ +---------+ |
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| 68 | | |
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| 69 | | |
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| 70 | v |
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| 71 | +---------+ |
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| 72 | | | |
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| 73 | | uart | |
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| 74 | | | |
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| 75 | +---------+ |
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| 76 | */ |
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| 77 | |
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| 78 | |
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| 79 | /***************************************************************************** |
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| 80 | Section A - Include Files |
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| 81 | *****************************************************************************/ |
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| 82 | |
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[c0c6168] | 83 | #include <rtems.h> |
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[274fa77] | 84 | #include <bsp.h> |
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[0b6d74d0] | 85 | #include <rtems/bspIo.h> |
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| 86 | #include <stdio.h> |
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[274fa77] | 87 | #include <rtems/libio.h> |
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| 88 | #include <libchip/serial.h> |
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| 89 | #include <libchip/sersupp.h> |
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| 90 | #include "sci.h" |
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[da2fc6c0] | 91 | /*#include "../misc/include/cpu332.h" */ |
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[274fa77] | 92 | |
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| 93 | |
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| 94 | /***************************************************************************** |
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| 95 | Section B - Manifest Constants |
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| 96 | *****************************************************************************/ |
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| 97 | |
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[da2fc6c0] | 98 | #define SCI_MINOR 0 /* minor device number */ |
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[274fa77] | 99 | |
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[da2fc6c0] | 100 | /* IMPORTANT - if the device driver api is opened, it means the sci is being |
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| 101 | * used for direct hardware access, so other users (like termios) get ignored |
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| 102 | */ |
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| 103 | #define DRIVER_CLOSED 0 /* the device driver api is closed */ |
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| 104 | #define DRIVER_OPENED 1 /* the device driver api is opened */ |
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[274fa77] | 105 | |
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[da2fc6c0] | 106 | /* system clock definitions, i dont have documentation on this... */ |
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[274fa77] | 107 | |
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[da2fc6c0] | 108 | #if 0 /* Not needed, this is provided in mrm332.h */ |
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| 109 | #define XTAL 32768.0 /* crystal frequency in Hz */ |
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| 110 | #define NUMB_W 0 /* system clock parameters */ |
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[274fa77] | 111 | #define NUMB_X 1 |
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[da2fc6c0] | 112 | #define NUMB_Y 0x38 /* for 14.942 Mhz */ |
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| 113 | #define NUMB_Y 0x3F /* for 16.777 Mhz */ |
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[274fa77] | 114 | |
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| 115 | #define SYS_CLOCK (XTAL * 4.0 * (NUMB_Y+1) * (1 << (2 * NUMB_W + NUMB_X))) |
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| 116 | |
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| 117 | #endif |
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| 118 | |
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| 119 | |
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| 120 | /***************************************************************************** |
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| 121 | Section C - External Data |
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| 122 | *****************************************************************************/ |
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| 123 | |
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| 124 | |
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| 125 | |
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| 126 | /***************************************************************************** |
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| 127 | Section D - External Functions |
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| 128 | *****************************************************************************/ |
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| 129 | |
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| 130 | |
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| 131 | |
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| 132 | /***************************************************************************** |
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| 133 | Section E - Local Functions |
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| 134 | *****************************************************************************/ |
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| 135 | |
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| 136 | void SCI_output_char(char c); |
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| 137 | |
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[da2fc6c0] | 138 | /*rtems_isr SciIsr( rtems_vector_number vector ); interrupt handler */ |
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[274fa77] | 139 | |
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[f74d9f1f] | 140 | const rtems_termios_callbacks * SciGetTermiosHandlers( int32_t polled ); |
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[274fa77] | 141 | |
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[da2fc6c0] | 142 | rtems_device_driver SciInitialize( /* device driver api */ |
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| 143 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 144 | rtems_device_driver SciOpen( /* device driver api */ |
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| 145 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 146 | rtems_device_driver SciClose( /* device driver api */ |
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| 147 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 148 | rtems_device_driver SciRead( /* device driver api */ |
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| 149 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 150 | rtems_device_driver SciWrite( /* device driver api */ |
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| 151 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 152 | rtems_device_driver SciControl( /* device driver api */ |
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| 153 | rtems_device_major_number, rtems_device_minor_number, void *); |
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| 154 | rtems_device_driver SciRead ( |
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| 155 | rtems_device_major_number, rtems_device_minor_number, void *); |
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[274fa77] | 156 | |
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[da2fc6c0] | 157 | int SciInterruptOpen(int, int, void *); /* termios api */ |
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| 158 | int SciInterruptClose(int, int, void *); /* termios api */ |
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| 159 | int SciInterruptWrite(int, const char *, int); /* termios api */ |
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[274fa77] | 160 | |
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[da2fc6c0] | 161 | int SciSetAttributes(int, const struct termios*); /* termios api */ |
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| 162 | int SciPolledOpen(int, int, void *); /* termios api */ |
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| 163 | int SciPolledClose(int, int, void *); /* termios api */ |
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| 164 | int SciPolledRead(int); /* termios api */ |
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| 165 | int SciPolledWrite(int, const char *, int); /* termios api */ |
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[274fa77] | 166 | |
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[da2fc6c0] | 167 | static void SciSetBaud(uint32_t rate); /* hardware routine */ |
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| 168 | static void SciSetDataBits(uint16_t bits); /* hardware routine */ |
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| 169 | static void SciSetParity(uint16_t parity); /* hardware routine */ |
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[274fa77] | 170 | |
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[da2fc6c0] | 171 | static void inline SciDisableAllInterrupts( void ); /* hardware routine */ |
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| 172 | static void inline SciDisableTransmitInterrupts( void );/* hardware routine */ |
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| 173 | static void inline SciDisableReceiveInterrupts( void ); /* hardware routine */ |
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[274fa77] | 174 | |
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[da2fc6c0] | 175 | static void inline SciEnableTransmitInterrupts( void ); /* hardware routine */ |
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| 176 | static void inline SciEnableReceiveInterrupts( void ); /* hardware routine */ |
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[274fa77] | 177 | |
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[da2fc6c0] | 178 | static void inline SciDisableReceiver( void ); /* hardware routine */ |
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| 179 | static void inline SciDisableTransmitter( void ); /* hardware routine */ |
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[274fa77] | 180 | |
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[da2fc6c0] | 181 | static void inline SciEnableReceiver( void ); /* hardware routine */ |
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| 182 | static void inline SciEnableTransmitter( void ); /* hardware routine */ |
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[274fa77] | 183 | |
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[da2fc6c0] | 184 | void SciWriteCharWait ( uint8_t ); /* hardware routine */ |
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| 185 | void SciWriteCharNoWait( uint8_t ); /* hardware routine */ |
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[274fa77] | 186 | |
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[da2fc6c0] | 187 | uint8_t inline SciCharAvailable( void ); /* hardware routine */ |
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[274fa77] | 188 | |
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[da2fc6c0] | 189 | uint8_t inline SciReadCharWait( void ); /* hardware routine */ |
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| 190 | uint8_t inline SciReadCharNoWait( void ); /* hardware routine */ |
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[274fa77] | 191 | |
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[da2fc6c0] | 192 | void SciSendBreak( void ); /* test routine */ |
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[274fa77] | 193 | |
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[4377b904] | 194 | static int8_t SciRcvBufGetChar(void); /* circular rcv buf */ |
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[da2fc6c0] | 195 | static void SciRcvBufPutChar( uint8_t); /* circular rcv buf */ |
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| 196 | #if 0 |
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| 197 | static void SciRcvBufFlush( void ); /* unused routine */ |
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| 198 | #endif |
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[274fa77] | 199 | |
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[4377b904] | 200 | void SciUnitTest(void); /* test routine */ |
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| 201 | void SciPrintStats(void); /* test routine */ |
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[274fa77] | 202 | |
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| 203 | |
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| 204 | /***************************************************************************** |
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| 205 | Section F - Local Variables |
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| 206 | *****************************************************************************/ |
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| 207 | |
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| 208 | static struct rtems_termios_tty *SciTermioTty; |
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| 209 | |
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[da2fc6c0] | 210 | static uint8_t SciInited = 0; /* has the driver been inited */ |
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[274fa77] | 211 | |
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[da2fc6c0] | 212 | static uint8_t SciOpened; /* has the driver been opened */ |
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[274fa77] | 213 | |
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[da2fc6c0] | 214 | static uint8_t SciMajor; /* major device number */ |
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[274fa77] | 215 | |
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[da2fc6c0] | 216 | static uint16_t SciBaud; /* current value in baud register */ |
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[274fa77] | 217 | |
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[da2fc6c0] | 218 | static uint32_t SciBytesIn = 0; /* bytes received */ |
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| 219 | static uint32_t SciBytesOut = 0; /* bytes transmitted */ |
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[274fa77] | 220 | |
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[da2fc6c0] | 221 | static uint32_t SciErrorsParity = 0; /* error counter */ |
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| 222 | static uint32_t SciErrorsNoise = 0; /* error counter */ |
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| 223 | static uint32_t SciErrorsFraming = 0; /* error counter */ |
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| 224 | static uint32_t SciErrorsOverrun = 0; /* error counter */ |
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[274fa77] | 225 | |
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| 226 | #if defined(CONSOLE_SCI) |
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| 227 | |
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[da2fc6c0] | 228 | /* this is what rtems printk uses to do polling based output */ |
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[274fa77] | 229 | |
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| 230 | BSP_output_char_function_type BSP_output_char = SCI_output_char; |
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| 231 | BSP_polling_getchar_function_type BSP_poll_char = NULL; |
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| 232 | |
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| 233 | #endif |
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| 234 | |
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[da2fc6c0] | 235 | /* cvs id string so you can use the unix ident command on the object */ |
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[274fa77] | 236 | |
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| 237 | #ifdef ID_STRINGS |
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| 238 | static const char SciIdent[]="$Id$"; |
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| 239 | #endif |
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| 240 | |
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| 241 | |
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| 242 | /***************************************************************************** |
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| 243 | Section G - A circular buffer for rcv chars when the driver interface is used. |
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| 244 | *****************************************************************************/ |
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| 245 | |
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[da2fc6c0] | 246 | /* it is trivial to wrap your buffer pointers when size is a power of two */ |
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[274fa77] | 247 | |
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[da2fc6c0] | 248 | #define SCI_RCV_BUF_SIZE 256 /* must be a power of 2 !!! */ |
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[274fa77] | 249 | |
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[da2fc6c0] | 250 | /* if someone opens the sci device using the device driver interface, |
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| 251 | * then the receive data interrupt handler will put characters in this buffer |
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| 252 | * instead of sending them up to the termios module for the console |
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| 253 | */ |
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[f74d9f1f] | 254 | static uint8_t SciRcvBuffer[SCI_RCV_BUF_SIZE]; |
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[274fa77] | 255 | |
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[da2fc6c0] | 256 | static uint8_t SciRcvBufPutIndex = 0; /* array index to put in next char */ |
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[274fa77] | 257 | |
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[da2fc6c0] | 258 | static uint8_t SciRcvBufGetIndex = 0; /* array index to take out next char */ |
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[274fa77] | 259 | |
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[da2fc6c0] | 260 | static uint16_t SciRcvBufCount = 0; /* how many bytes are in the buffer */ |
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[274fa77] | 261 | |
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| 262 | |
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| 263 | |
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| 264 | /***************************************************************************** |
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| 265 | Section H - RTEMS termios callbacks for the interrupt version of the driver |
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| 266 | *****************************************************************************/ |
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| 267 | |
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| 268 | static const rtems_termios_callbacks SciInterruptCallbacks = |
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| 269 | { |
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[da2fc6c0] | 270 | SciInterruptOpen, /* first open */ |
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| 271 | SciInterruptClose, /* last close */ |
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| 272 | NULL, /* polled read (not required) */ |
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| 273 | SciInterruptWrite, /* write */ |
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| 274 | SciSetAttributes, /* set attributes */ |
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| 275 | NULL, /* stop remote xmit */ |
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| 276 | NULL, /* start remote xmit */ |
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| 277 | TRUE /* output uses interrupts */ |
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[274fa77] | 278 | }; |
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| 279 | |
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| 280 | /***************************************************************************** |
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| 281 | Section I - RTEMS termios callbacks for the polled version of the driver |
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| 282 | *****************************************************************************/ |
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| 283 | |
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| 284 | static const rtems_termios_callbacks SciPolledCallbacks = |
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| 285 | { |
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[da2fc6c0] | 286 | SciPolledOpen, /* first open */ |
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| 287 | SciPolledClose, /* last close */ |
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| 288 | SciPolledRead, /* polled read */ |
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| 289 | SciPolledWrite, /* write */ |
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| 290 | SciSetAttributes, /* set attributes */ |
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| 291 | NULL, /* stop remote xmit */ |
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| 292 | NULL, /* start remote xmit */ |
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| 293 | FALSE /* output uses interrupts */ |
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[274fa77] | 294 | }; |
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| 295 | |
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| 296 | |
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[da2fc6c0] | 297 | /* |
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| 298 | * SECTION 0 |
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| 299 | * MISCELLANEOUS ROUTINES |
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| 300 | */ |
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[274fa77] | 301 | |
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| 302 | /**************************************************************************** |
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[da2fc6c0] | 303 | * Func: SCI_output_char |
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| 304 | * Desc: used by rtems printk function to send a char to the uart |
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| 305 | * Inputs: the character to transmit |
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| 306 | * Outputs: none |
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| 307 | * Errors: none |
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| 308 | * Scope: public |
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| 309 | ****************************************************************************/ |
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[274fa77] | 310 | |
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| 311 | void SCI_output_char(char c) |
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| 312 | { |
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[da2fc6c0] | 313 | /* ( minor device number, pointer to the character, length ) */ |
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[274fa77] | 314 | |
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| 315 | SciPolledWrite( SCI_MINOR, &c, 1); |
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| 316 | |
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| 317 | return; |
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| 318 | } |
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| 319 | |
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| 320 | |
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| 321 | /**************************************************************************** |
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| 322 | * Func: SciGetTermiosHandlers |
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| 323 | * Desc: returns a pointer to the table of serial io functions |
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| 324 | * this is called from console_open with polled set to false |
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| 325 | * Inputs: flag indicating whether we want polled or interrupt driven io |
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| 326 | * Outputs: pointer to function table |
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| 327 | * Errors: none |
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| 328 | * Scope: public |
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| 329 | ****************************************************************************/ |
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| 330 | |
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[f74d9f1f] | 331 | const rtems_termios_callbacks * SciGetTermiosHandlers( int32_t polled ) |
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[274fa77] | 332 | { |
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| 333 | if ( polled ) |
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| 334 | { |
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[da2fc6c0] | 335 | return &SciPolledCallbacks; /* polling based */ |
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[274fa77] | 336 | } |
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| 337 | else |
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| 338 | { |
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[da2fc6c0] | 339 | return &SciInterruptCallbacks; /* interrupt driven */ |
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[274fa77] | 340 | } |
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| 341 | } |
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| 342 | |
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| 343 | |
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| 344 | /**************************************************************************** |
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| 345 | * Func: SciIsr |
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| 346 | * Desc: interrupt handler for serial communications interface |
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| 347 | * Inputs: vector number - unused |
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| 348 | * Outputs: none |
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| 349 | * Errors: none |
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| 350 | * Scope: public API |
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| 351 | ****************************************************************************/ |
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| 352 | |
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| 353 | rtems_isr SciIsr( rtems_vector_number vector ) |
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| 354 | { |
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[f74d9f1f] | 355 | uint8_t ch; |
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[274fa77] | 356 | |
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| 357 | if ( (*SCSR) & SCI_ERROR_PARITY ) SciErrorsParity ++; |
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| 358 | if ( (*SCSR) & SCI_ERROR_FRAMING ) SciErrorsFraming ++; |
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| 359 | if ( (*SCSR) & SCI_ERROR_NOISE ) SciErrorsNoise ++; |
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| 360 | if ( (*SCSR) & SCI_ERROR_OVERRUN ) SciErrorsOverrun ++; |
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| 361 | |
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[da2fc6c0] | 362 | /* see if it was a transmit interrupt */ |
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[274fa77] | 363 | |
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[da2fc6c0] | 364 | if ( (*SCSR) & SCI_XMTR_AVAILABLE ) /* data reg empty, xmt complete */ |
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[274fa77] | 365 | { |
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| 366 | SciDisableTransmitInterrupts(); |
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| 367 | |
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[da2fc6c0] | 368 | /* tell termios module that the charcter was sent */ |
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| 369 | /* he will call us later to transmit more if there are any */ |
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[274fa77] | 370 | |
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| 371 | if (rtems_termios_dequeue_characters( SciTermioTty, 1 )) |
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| 372 | { |
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[da2fc6c0] | 373 | /* there are more bytes to transmit so enable TX interrupt */ |
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[274fa77] | 374 | |
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| 375 | SciEnableTransmitInterrupts(); |
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| 376 | } |
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| 377 | } |
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| 378 | |
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[da2fc6c0] | 379 | /* see if it was a receive interrupt */ |
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| 380 | /* on the sci uart we just get one character per interrupt */ |
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[274fa77] | 381 | |
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[da2fc6c0] | 382 | while ( SciCharAvailable() ) /* char in data register? */ |
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[274fa77] | 383 | { |
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[da2fc6c0] | 384 | ch = SciReadCharNoWait(); /* get the char from the uart */ |
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[274fa77] | 385 | |
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[da2fc6c0] | 386 | /* IMPORTANT!!! */ |
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| 387 | /* either send it to the termios module or keep it locally */ |
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[274fa77] | 388 | |
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[da2fc6c0] | 389 | if ( SciOpened == DRIVER_OPENED ) /* the driver is open */ |
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[274fa77] | 390 | { |
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[da2fc6c0] | 391 | SciRcvBufPutChar(ch); /* keep it locally */ |
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[274fa77] | 392 | } |
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[da2fc6c0] | 393 | else /* put in termios buffer */ |
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[274fa77] | 394 | { |
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[da2fc6c0] | 395 | char c = (char) ch; |
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| 396 | rtems_termios_enqueue_raw_characters( SciTermioTty, &c, 1 ); |
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[274fa77] | 397 | } |
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| 398 | |
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[da2fc6c0] | 399 | *SCSR &= SCI_CLEAR_RX_INT; /* clear the interrupt */ |
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[274fa77] | 400 | } |
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| 401 | } |
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| 402 | |
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| 403 | |
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[da2fc6c0] | 404 | /* |
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| 405 | * SECTION 1 |
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| 406 | * ROUTINES TO MANIPULATE THE CIRCULAR BUFFER |
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| 407 | */ |
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[274fa77] | 408 | |
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| 409 | /**************************************************************************** |
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| 410 | * Func: SciRcvBufGetChar |
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| 411 | * Desc: read a character from the circular buffer |
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| 412 | * make sure there is data before you call this! |
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| 413 | * Inputs: none |
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| 414 | * Outputs: the character or -1 |
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| 415 | * Errors: none |
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| 416 | * Scope: private |
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| 417 | ****************************************************************************/ |
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| 418 | |
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[4377b904] | 419 | static int8_t SciRcvBufGetChar(void) |
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[274fa77] | 420 | { |
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| 421 | rtems_interrupt_level level; |
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[f74d9f1f] | 422 | uint8_t ch; |
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[6128a4a] | 423 | |
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[274fa77] | 424 | if ( SciRcvBufCount == 0 ) |
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| 425 | { |
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[da2fc6c0] | 426 | rtems_fatal_error_occurred(0xDEAD); /* check the count first! */ |
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[274fa77] | 427 | } |
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| 428 | |
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[da2fc6c0] | 429 | rtems_interrupt_disable( level ); /* disable interrupts */ |
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[274fa77] | 430 | |
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[da2fc6c0] | 431 | ch = SciRcvBuffer[SciRcvBufGetIndex]; /* get next byte */ |
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[274fa77] | 432 | |
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[da2fc6c0] | 433 | SciRcvBufGetIndex++; /* bump the index */ |
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[274fa77] | 434 | |
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[da2fc6c0] | 435 | SciRcvBufGetIndex &= SCI_RCV_BUF_SIZE - 1; /* and wrap it */ |
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[274fa77] | 436 | |
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[da2fc6c0] | 437 | SciRcvBufCount--; /* decrement counter */ |
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[274fa77] | 438 | |
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[da2fc6c0] | 439 | rtems_interrupt_enable( level ); /* restore interrupts */ |
---|
[274fa77] | 440 | |
---|
[da2fc6c0] | 441 | return ch; /* return the char */ |
---|
[274fa77] | 442 | } |
---|
| 443 | |
---|
| 444 | |
---|
| 445 | /**************************************************************************** |
---|
| 446 | * Func: SciRcvBufPutChar |
---|
| 447 | * Desc: put a character into the rcv data circular buffer |
---|
| 448 | * Inputs: the character |
---|
| 449 | * Outputs: none |
---|
| 450 | * Errors: none |
---|
| 451 | * Scope: private |
---|
| 452 | ****************************************************************************/ |
---|
| 453 | |
---|
[f74d9f1f] | 454 | static void SciRcvBufPutChar( uint8_t ch ) |
---|
[274fa77] | 455 | { |
---|
| 456 | rtems_interrupt_level level; |
---|
[6128a4a] | 457 | |
---|
[da2fc6c0] | 458 | if ( SciRcvBufCount == SCI_RCV_BUF_SIZE ) /* is there room? */ |
---|
[274fa77] | 459 | { |
---|
[da2fc6c0] | 460 | return; /* no, throw it away */ |
---|
[274fa77] | 461 | } |
---|
| 462 | |
---|
[da2fc6c0] | 463 | rtems_interrupt_disable( level ); /* disable interrupts */ |
---|
[274fa77] | 464 | |
---|
[da2fc6c0] | 465 | SciRcvBuffer[SciRcvBufPutIndex] = ch; /* put it in the buf */ |
---|
[274fa77] | 466 | |
---|
[da2fc6c0] | 467 | SciRcvBufPutIndex++; /* bump the index */ |
---|
[274fa77] | 468 | |
---|
[da2fc6c0] | 469 | SciRcvBufPutIndex &= SCI_RCV_BUF_SIZE - 1; /* and wrap it */ |
---|
[274fa77] | 470 | |
---|
[da2fc6c0] | 471 | SciRcvBufCount++; /* increment counter */ |
---|
[274fa77] | 472 | |
---|
[da2fc6c0] | 473 | rtems_interrupt_enable( level ); /* restore interrupts */ |
---|
[274fa77] | 474 | |
---|
[da2fc6c0] | 475 | return; /* return */ |
---|
[274fa77] | 476 | } |
---|
| 477 | |
---|
| 478 | |
---|
| 479 | /**************************************************************************** |
---|
| 480 | * Func: SciRcvBufFlush |
---|
| 481 | * Desc: completely reset and clear the rcv buffer |
---|
| 482 | * Inputs: none |
---|
| 483 | * Outputs: none |
---|
| 484 | * Errors: none |
---|
| 485 | * Scope: private |
---|
| 486 | ****************************************************************************/ |
---|
| 487 | |
---|
[da2fc6c0] | 488 | #if 0 /* prevents compiler warning */ |
---|
[274fa77] | 489 | static void SciRcvBufFlush( void ) |
---|
| 490 | { |
---|
| 491 | rtems_interrupt_level level; |
---|
[6128a4a] | 492 | |
---|
[da2fc6c0] | 493 | rtems_interrupt_disable( level ); /* disable interrupts */ |
---|
[274fa77] | 494 | |
---|
| 495 | memset( SciRcvBuffer, 0, sizeof(SciRcvBuffer) ); |
---|
| 496 | |
---|
[da2fc6c0] | 497 | SciRcvBufPutIndex = 0; /* clear */ |
---|
[274fa77] | 498 | |
---|
[da2fc6c0] | 499 | SciRcvBufGetIndex = 0; /* clear */ |
---|
[274fa77] | 500 | |
---|
[da2fc6c0] | 501 | SciRcvBufCount = 0; /* clear */ |
---|
[274fa77] | 502 | |
---|
[da2fc6c0] | 503 | rtems_interrupt_enable( level ); /* restore interrupts */ |
---|
[274fa77] | 504 | |
---|
[da2fc6c0] | 505 | return; /* return */ |
---|
[274fa77] | 506 | } |
---|
| 507 | #endif |
---|
| 508 | |
---|
| 509 | |
---|
[da2fc6c0] | 510 | /* |
---|
| 511 | * |
---|
| 512 | * SECTION 2 |
---|
| 513 | * INTERRUPT BASED ENTRY POINTS FOR THE TERMIOS MODULE |
---|
| 514 | */ |
---|
[274fa77] | 515 | |
---|
| 516 | /**************************************************************************** |
---|
| 517 | * Func: SciInterruptOpen |
---|
| 518 | * Desc: open routine for the interrupt based device driver |
---|
| 519 | * Default state is 9600 baud, 8 bits, No parity, and 1 stop bit. ?? |
---|
[c0c6168] | 520 | **CHANGED** Default baud rate is now 19200, 8N1 |
---|
[274fa77] | 521 | * called from rtems_termios_open which is called from console_open |
---|
| 522 | * Inputs: major - device number |
---|
| 523 | * minor - device number |
---|
| 524 | * args - points to terminal info |
---|
| 525 | * Outputs: success/fail |
---|
| 526 | * Errors: none |
---|
| 527 | * Scope: public API |
---|
| 528 | ****************************************************************************/ |
---|
| 529 | |
---|
[da2fc6c0] | 530 | int SciInterruptOpen( |
---|
| 531 | int major, |
---|
| 532 | int minor, |
---|
| 533 | void *arg |
---|
[274fa77] | 534 | ) |
---|
| 535 | { |
---|
| 536 | rtems_libio_open_close_args_t * args = arg; |
---|
| 537 | rtems_isr_entry old_vector; |
---|
| 538 | |
---|
[da2fc6c0] | 539 | if ( minor != SCI_MINOR ) /* check minor device num */ |
---|
[274fa77] | 540 | { |
---|
| 541 | return -1; |
---|
| 542 | } |
---|
| 543 | |
---|
[da2fc6c0] | 544 | if ( !args ) /* must have args */ |
---|
[274fa77] | 545 | { |
---|
| 546 | return -1; |
---|
| 547 | } |
---|
| 548 | |
---|
[da2fc6c0] | 549 | SciTermioTty = args->iop->data1; /* save address of struct */ |
---|
[274fa77] | 550 | |
---|
[da2fc6c0] | 551 | SciDisableAllInterrupts(); /* turn off sci interrupts */ |
---|
[274fa77] | 552 | |
---|
[da2fc6c0] | 553 | /* THIS IS ACTUALLY A BAD THING - SETTING LINE PARAMETERS HERE */ |
---|
| 554 | /* IT SHOULD BE DONE THROUGH TCSETATTR() WHEN THE CONSOLE IS OPENED!!! */ |
---|
[274fa77] | 555 | |
---|
[da2fc6c0] | 556 | /* SciSetBaud(115200); set the baud rate */ |
---|
| 557 | /* SciSetBaud( 57600); set the baud rate */ |
---|
| 558 | /* SciSetBaud( 38400); set the baud rate */ |
---|
| 559 | SciSetBaud( 19200); /* set the baud rate */ |
---|
| 560 | /* SciSetBaud( 9600); set the baud rate */ |
---|
[274fa77] | 561 | |
---|
[da2fc6c0] | 562 | SciSetParity(SCI_PARITY_NONE); /* set parity to none */ |
---|
[274fa77] | 563 | |
---|
[da2fc6c0] | 564 | SciSetDataBits(SCI_8_DATA_BITS); /* set data bits to 8 */ |
---|
[274fa77] | 565 | |
---|
[da2fc6c0] | 566 | /* Install our interrupt handler into RTEMS, where does 66 come from? */ |
---|
[274fa77] | 567 | |
---|
| 568 | rtems_interrupt_catch( SciIsr, 66, &old_vector ); |
---|
| 569 | |
---|
| 570 | *QIVR = 66; |
---|
| 571 | *QIVR &= 0xf8; |
---|
| 572 | *QILR |= 0x06 & 0x07; |
---|
| 573 | |
---|
[da2fc6c0] | 574 | SciEnableTransmitter(); /* enable the transmitter */ |
---|
[274fa77] | 575 | |
---|
[da2fc6c0] | 576 | SciEnableReceiver(); /* enable the receiver */ |
---|
[274fa77] | 577 | |
---|
[da2fc6c0] | 578 | SciEnableReceiveInterrupts(); /* enable rcv interrupts */ |
---|
[274fa77] | 579 | |
---|
| 580 | return RTEMS_SUCCESSFUL; |
---|
| 581 | } |
---|
| 582 | |
---|
| 583 | |
---|
| 584 | /**************************************************************************** |
---|
| 585 | * Func: SciInterruptClose |
---|
| 586 | * Desc: close routine called by the termios module |
---|
| 587 | * Inputs: major - device number |
---|
| 588 | * minor - device number |
---|
| 589 | * args - unused |
---|
| 590 | * Outputs: success/fail |
---|
| 591 | * Errors: none |
---|
| 592 | * Scope: public - termio entry point |
---|
| 593 | ****************************************************************************/ |
---|
| 594 | |
---|
[da2fc6c0] | 595 | int SciInterruptClose( |
---|
| 596 | int major, |
---|
| 597 | int minor, |
---|
| 598 | void *arg |
---|
[274fa77] | 599 | ) |
---|
| 600 | { |
---|
| 601 | SciDisableAllInterrupts(); |
---|
| 602 | |
---|
| 603 | return RTEMS_SUCCESSFUL; |
---|
| 604 | } |
---|
| 605 | |
---|
| 606 | |
---|
| 607 | /**************************************************************************** |
---|
| 608 | * Func: SciInterruptWrite |
---|
| 609 | * Desc: writes data to the uart using transmit interrupts |
---|
| 610 | * Inputs: minor - device number |
---|
| 611 | * buf - points to the data |
---|
| 612 | * len - number of bytes to send |
---|
| 613 | * Outputs: success/fail |
---|
| 614 | * Errors: none |
---|
| 615 | * Scope: public API |
---|
| 616 | ****************************************************************************/ |
---|
| 617 | |
---|
[da2fc6c0] | 618 | int SciInterruptWrite( |
---|
| 619 | int minor, |
---|
[274fa77] | 620 | const char *buf, |
---|
[da2fc6c0] | 621 | int len |
---|
[274fa77] | 622 | ) |
---|
| 623 | { |
---|
[da2fc6c0] | 624 | /* We are using interrupt driven output so termios only sends us */ |
---|
| 625 | /* one character at a time. The sci does not have a fifo. */ |
---|
[274fa77] | 626 | |
---|
[da2fc6c0] | 627 | if ( !len ) /* no data? */ |
---|
[274fa77] | 628 | { |
---|
[da2fc6c0] | 629 | return 0; /* return error */ |
---|
[274fa77] | 630 | } |
---|
| 631 | |
---|
[da2fc6c0] | 632 | if ( minor != SCI_MINOR ) /* check the minor dev num */ |
---|
[274fa77] | 633 | { |
---|
[da2fc6c0] | 634 | return 0; /* return error */ |
---|
[274fa77] | 635 | } |
---|
| 636 | |
---|
[da2fc6c0] | 637 | if ( SciOpened == DRIVER_OPENED ) /* is the driver api open? */ |
---|
[274fa77] | 638 | { |
---|
[da2fc6c0] | 639 | return 1; /* yep, throw this away */ |
---|
[274fa77] | 640 | } |
---|
| 641 | |
---|
[da2fc6c0] | 642 | SciWriteCharNoWait(*buf); /* try to send a char */ |
---|
[274fa77] | 643 | |
---|
[da2fc6c0] | 644 | *SCSR &= SCI_CLEAR_TDRE; /* clear tx data reg empty flag */ |
---|
[274fa77] | 645 | |
---|
[da2fc6c0] | 646 | SciEnableTransmitInterrupts(); /* enable the tx interrupt */ |
---|
[274fa77] | 647 | |
---|
[da2fc6c0] | 648 | return 1; /* return success */ |
---|
[274fa77] | 649 | } |
---|
| 650 | |
---|
| 651 | |
---|
| 652 | /**************************************************************************** |
---|
| 653 | * Func: SciSetAttributes |
---|
| 654 | * Desc: setup the uart based on the termios modules requests |
---|
| 655 | * Inputs: minor - device number |
---|
| 656 | * t - pointer to the termios info struct |
---|
| 657 | * Outputs: none |
---|
| 658 | * Errors: none |
---|
| 659 | * Scope: public API |
---|
| 660 | ****************************************************************************/ |
---|
| 661 | |
---|
[da2fc6c0] | 662 | int SciSetAttributes( |
---|
| 663 | int minor, |
---|
[274fa77] | 664 | const struct termios *t |
---|
| 665 | ) |
---|
| 666 | { |
---|
[f74d9f1f] | 667 | uint32_t baud_requested; |
---|
| 668 | uint32_t sci_rate = 0; |
---|
| 669 | uint16_t sci_parity = 0; |
---|
| 670 | uint16_t sci_databits = 0; |
---|
[274fa77] | 671 | |
---|
[da2fc6c0] | 672 | if ( minor != SCI_MINOR ) /* check the minor dev num */ |
---|
[6128a4a] | 673 | { |
---|
[da2fc6c0] | 674 | return -1; /* return error */ |
---|
[274fa77] | 675 | } |
---|
| 676 | |
---|
[da2fc6c0] | 677 | /* if you look closely you will see this is the only thing we use */ |
---|
| 678 | /* set the baud rate */ |
---|
[274fa77] | 679 | |
---|
[da2fc6c0] | 680 | baud_requested = t->c_cflag & CBAUD; /* baud rate */ |
---|
[274fa77] | 681 | |
---|
| 682 | if (!baud_requested) |
---|
| 683 | { |
---|
[da2fc6c0] | 684 | /* baud_requested = B9600; default to 9600 baud */ |
---|
| 685 | baud_requested = B19200; /* default to 19200 baud */ |
---|
[274fa77] | 686 | } |
---|
[6128a4a] | 687 | |
---|
[274fa77] | 688 | sci_rate = termios_baud_to_number( baud_requested ); |
---|
| 689 | |
---|
[da2fc6c0] | 690 | /* parity error detection */ |
---|
[274fa77] | 691 | |
---|
[da2fc6c0] | 692 | if (t->c_cflag & PARENB) /* enable parity detection? */ |
---|
[274fa77] | 693 | { |
---|
| 694 | if (t->c_cflag & PARODD) |
---|
| 695 | { |
---|
[da2fc6c0] | 696 | sci_parity = SCI_PARITY_ODD; /* select odd parity */ |
---|
[274fa77] | 697 | } |
---|
| 698 | else |
---|
| 699 | { |
---|
[da2fc6c0] | 700 | sci_parity = SCI_PARITY_EVEN; /* select even parity */ |
---|
[274fa77] | 701 | } |
---|
| 702 | } |
---|
| 703 | else |
---|
| 704 | { |
---|
[da2fc6c0] | 705 | sci_parity = SCI_PARITY_NONE; /* no parity, most common */ |
---|
[274fa77] | 706 | } |
---|
| 707 | |
---|
[da2fc6c0] | 708 | /* set the number of data bits, 8 is most common */ |
---|
[274fa77] | 709 | |
---|
[da2fc6c0] | 710 | if (t->c_cflag & CSIZE) /* was it specified? */ |
---|
[274fa77] | 711 | { |
---|
| 712 | switch (t->c_cflag & CSIZE) |
---|
| 713 | { |
---|
| 714 | case CS8: sci_databits = SCI_8_DATA_BITS; break; |
---|
| 715 | default : sci_databits = SCI_9_DATA_BITS; break; |
---|
| 716 | } |
---|
| 717 | } |
---|
| 718 | else |
---|
| 719 | { |
---|
[da2fc6c0] | 720 | sci_databits = SCI_8_DATA_BITS; /* default to 8 data bits */ |
---|
[274fa77] | 721 | } |
---|
| 722 | |
---|
[da2fc6c0] | 723 | /* the number of stop bits; always 1 for SCI */ |
---|
[274fa77] | 724 | |
---|
| 725 | if (t->c_cflag & CSTOPB) |
---|
| 726 | { |
---|
[da2fc6c0] | 727 | /* do nothing */ |
---|
[274fa77] | 728 | } |
---|
| 729 | |
---|
[da2fc6c0] | 730 | /* setup the hardware with these serial port parameters */ |
---|
[274fa77] | 731 | |
---|
[da2fc6c0] | 732 | SciSetBaud(sci_rate); /* set the baud rate */ |
---|
| 733 | SciSetParity(sci_parity); /* set the parity type */ |
---|
| 734 | SciSetDataBits(sci_databits); /* set the data bits */ |
---|
[274fa77] | 735 | |
---|
| 736 | return RTEMS_SUCCESSFUL; |
---|
| 737 | } |
---|
| 738 | |
---|
| 739 | |
---|
[da2fc6c0] | 740 | /* |
---|
| 741 | * |
---|
| 742 | * SECTION 3 |
---|
| 743 | * POLLING BASED ENTRY POINTS FOR THE TERMIOS MODULE |
---|
| 744 | */ |
---|
[274fa77] | 745 | |
---|
| 746 | /**************************************************************************** |
---|
| 747 | * Func: SciPolledOpen |
---|
| 748 | * Desc: open routine for the polled i/o version of the driver |
---|
| 749 | * called from rtems_termios_open which is called from console_open |
---|
| 750 | * Inputs: major - device number |
---|
| 751 | * minor - device number |
---|
| 752 | * args - points to terminal info struct |
---|
| 753 | * Outputs: success/fail |
---|
| 754 | * Errors: none |
---|
| 755 | * Scope: public - termios entry point |
---|
| 756 | ****************************************************************************/ |
---|
| 757 | |
---|
[da2fc6c0] | 758 | int SciPolledOpen( |
---|
| 759 | int major, |
---|
| 760 | int minor, |
---|
| 761 | void *arg |
---|
[274fa77] | 762 | ) |
---|
| 763 | { |
---|
| 764 | rtems_libio_open_close_args_t * args = arg; |
---|
| 765 | |
---|
[da2fc6c0] | 766 | if ( minor != SCI_MINOR ) /* check minor device num */ |
---|
[274fa77] | 767 | { |
---|
| 768 | return -1; |
---|
| 769 | } |
---|
| 770 | |
---|
[da2fc6c0] | 771 | if ( !args ) /* must have args */ |
---|
[274fa77] | 772 | { |
---|
| 773 | return -1; |
---|
| 774 | } |
---|
| 775 | |
---|
[da2fc6c0] | 776 | SciTermioTty = args->iop->data1; /* Store tty pointer */ |
---|
[274fa77] | 777 | |
---|
[da2fc6c0] | 778 | SciDisableAllInterrupts(); /* don't generate interrupts */ |
---|
[274fa77] | 779 | |
---|
[da2fc6c0] | 780 | /* THIS IS ACTUALLY A BAD THING - SETTING LINE PARAMETERS HERE */ |
---|
| 781 | /* IT SHOULD BE DONE THROUGH TCSETATTR() WHEN THE CONSOLE IS OPENED!!! */ |
---|
[274fa77] | 782 | |
---|
[da2fc6c0] | 783 | /* SciSetBaud(115200); set the baud rate */ |
---|
| 784 | /* SciSetBaud( 57600); set the baud rate */ |
---|
| 785 | /* SciSetBaud( 38400); set the baud rate */ |
---|
| 786 | SciSetBaud( 19200); /* set the baud rate */ |
---|
| 787 | /* SciSetBaud( 9600); set the baud rate */ |
---|
[274fa77] | 788 | |
---|
[da2fc6c0] | 789 | SciSetParity(SCI_PARITY_NONE); /* set no parity */ |
---|
[274fa77] | 790 | |
---|
[da2fc6c0] | 791 | SciSetDataBits(SCI_8_DATA_BITS); /* set 8 data bits */ |
---|
[274fa77] | 792 | |
---|
[da2fc6c0] | 793 | SciEnableTransmitter(); /* enable the xmitter */ |
---|
[274fa77] | 794 | |
---|
[da2fc6c0] | 795 | SciEnableReceiver(); /* enable the rcvr */ |
---|
[274fa77] | 796 | |
---|
| 797 | return RTEMS_SUCCESSFUL; |
---|
| 798 | } |
---|
| 799 | |
---|
| 800 | |
---|
| 801 | /**************************************************************************** |
---|
| 802 | * Func: SciPolledClose |
---|
| 803 | * Desc: close routine for the device driver, same for both |
---|
| 804 | * Inputs: major - device number |
---|
| 805 | * minor - device number |
---|
| 806 | * args - unused |
---|
| 807 | * Outputs: success/fail |
---|
| 808 | * Errors: none |
---|
| 809 | * Scope: public termios API |
---|
| 810 | ****************************************************************************/ |
---|
| 811 | |
---|
[da2fc6c0] | 812 | int SciPolledClose( |
---|
| 813 | int major, |
---|
| 814 | int minor, |
---|
| 815 | void *arg |
---|
[274fa77] | 816 | ) |
---|
| 817 | { |
---|
| 818 | SciDisableAllInterrupts(); |
---|
| 819 | |
---|
| 820 | return RTEMS_SUCCESSFUL; |
---|
| 821 | } |
---|
| 822 | |
---|
| 823 | |
---|
| 824 | /**************************************************************************** |
---|
| 825 | * Func: SciPolledRead |
---|
| 826 | * Desc: polling based read routine for the uart |
---|
| 827 | * Inputs: minor - device number |
---|
| 828 | * Outputs: error or the character read |
---|
| 829 | * Errors: none |
---|
| 830 | * Scope: public API |
---|
| 831 | ****************************************************************************/ |
---|
| 832 | |
---|
[da2fc6c0] | 833 | int SciPolledRead( |
---|
| 834 | int minor |
---|
[274fa77] | 835 | ) |
---|
| 836 | { |
---|
[da2fc6c0] | 837 | if ( minor != SCI_MINOR ) /* check the type-punned dev num */ |
---|
[274fa77] | 838 | { |
---|
[da2fc6c0] | 839 | return -1; /* return error */ |
---|
[274fa77] | 840 | } |
---|
| 841 | |
---|
[da2fc6c0] | 842 | if ( SciCharAvailable() ) /* if a char is available */ |
---|
[274fa77] | 843 | { |
---|
[da2fc6c0] | 844 | return SciReadCharNoWait(); /* read the rx data register */ |
---|
[274fa77] | 845 | } |
---|
| 846 | |
---|
[da2fc6c0] | 847 | return -1; /* return error */ |
---|
[274fa77] | 848 | } |
---|
| 849 | |
---|
| 850 | |
---|
| 851 | /**************************************************************************** |
---|
| 852 | * Func: SciPolledWrite |
---|
| 853 | * Desc: writes out characters in polled mode, waiting for the uart |
---|
| 854 | * check in console_open, but we only seem to use interrupt mode |
---|
| 855 | * Inputs: minor - device number |
---|
| 856 | * buf - points to the data |
---|
| 857 | * len - how many bytes |
---|
| 858 | * Outputs: error or number of bytes written |
---|
| 859 | * Errors: none |
---|
| 860 | * Scope: public termios API |
---|
| 861 | ****************************************************************************/ |
---|
| 862 | |
---|
[da2fc6c0] | 863 | int SciPolledWrite( |
---|
| 864 | int minor, |
---|
| 865 | const char *buf, |
---|
| 866 | int len |
---|
[274fa77] | 867 | ) |
---|
| 868 | { |
---|
[f74d9f1f] | 869 | int32_t written = 0; |
---|
[274fa77] | 870 | |
---|
[da2fc6c0] | 871 | if ( minor != SCI_MINOR ) /* check minor device num */ |
---|
[274fa77] | 872 | { |
---|
| 873 | return -1; |
---|
| 874 | } |
---|
| 875 | |
---|
[da2fc6c0] | 876 | if ( SciOpened == DRIVER_OPENED ) /* is the driver api open? */ |
---|
[274fa77] | 877 | { |
---|
[da2fc6c0] | 878 | return -1; /* toss the data */ |
---|
[274fa77] | 879 | } |
---|
| 880 | |
---|
[da2fc6c0] | 881 | /* send each byte in the string out the port */ |
---|
[274fa77] | 882 | |
---|
| 883 | while ( written < len ) |
---|
| 884 | { |
---|
[da2fc6c0] | 885 | SciWriteCharWait(*buf++); /* send a byte */ |
---|
[274fa77] | 886 | |
---|
[da2fc6c0] | 887 | written++; /* increment counter */ |
---|
[274fa77] | 888 | } |
---|
| 889 | |
---|
[da2fc6c0] | 890 | return written; /* return count */ |
---|
[274fa77] | 891 | } |
---|
| 892 | |
---|
| 893 | |
---|
[da2fc6c0] | 894 | /* |
---|
| 895 | * |
---|
| 896 | * SECTION 4 |
---|
| 897 | * DEVICE DRIVER PUBLIC API ENTRY POINTS |
---|
| 898 | */ |
---|
[274fa77] | 899 | |
---|
| 900 | /**************************************************************************** |
---|
| 901 | * Func: SciInit |
---|
| 902 | * Desc: Initialize the lasers device driver and hardware |
---|
| 903 | * Inputs: major - the major device number which is assigned by rtems |
---|
| 904 | * minor - the minor device number which is undefined at this point |
---|
| 905 | * arg - ????? |
---|
| 906 | * Outputs: RTEMS_SUCCESSFUL |
---|
| 907 | * Errors: None. |
---|
| 908 | * Scope: public API |
---|
| 909 | ****************************************************************************/ |
---|
| 910 | |
---|
| 911 | rtems_device_driver SciInitialize ( |
---|
| 912 | rtems_device_major_number major, |
---|
| 913 | rtems_device_minor_number minor, |
---|
| 914 | void * arg |
---|
| 915 | ) |
---|
| 916 | { |
---|
[da2fc6c0] | 917 | /* rtems_status_code status; */ |
---|
[274fa77] | 918 | |
---|
[da2fc6c0] | 919 | /*printk("%s\r\n", __FUNCTION__); */ |
---|
[274fa77] | 920 | |
---|
[da2fc6c0] | 921 | /* register the SCI device name for termios console i/o |
---|
| 922 | * this is done over in console.c which doesn't seem exactly right |
---|
| 923 | * but there were problems doing it here... |
---|
| 924 | */ |
---|
[274fa77] | 925 | |
---|
[da2fc6c0] | 926 | /* status = rtems_io_register_name( "/dev/sci", major, 0 ); */ |
---|
[274fa77] | 927 | |
---|
[da2fc6c0] | 928 | /* if (status != RTEMS_SUCCESSFUL) */ |
---|
| 929 | /* rtems_fatal_error_occurred(status); */ |
---|
[274fa77] | 930 | |
---|
[da2fc6c0] | 931 | SciMajor = major; /* save the rtems major number */ |
---|
[274fa77] | 932 | |
---|
[da2fc6c0] | 933 | SciOpened = DRIVER_CLOSED; /* initial state is closed */ |
---|
[274fa77] | 934 | |
---|
[da2fc6c0] | 935 | /* if you have an interrupt handler, install it here */ |
---|
[274fa77] | 936 | |
---|
[da2fc6c0] | 937 | SciInited = 1; /* set the inited flag */ |
---|
[274fa77] | 938 | |
---|
| 939 | return RTEMS_SUCCESSFUL; |
---|
| 940 | } |
---|
| 941 | |
---|
| 942 | |
---|
| 943 | /**************************************************************************** |
---|
| 944 | * Func: SciOpen |
---|
| 945 | * Desc: device driver open routine |
---|
| 946 | * you must open a device before you can anything else |
---|
| 947 | * only one process can have the device opened at a time |
---|
| 948 | * you could look at the task id to restrict access if you want |
---|
| 949 | * Inputs: major - the major device number assigned by rtems |
---|
| 950 | * minor - the minor device number assigned by us |
---|
| 951 | * arg - ????? |
---|
| 952 | * Outputs: see below |
---|
| 953 | * Errors: none |
---|
| 954 | * Scope: public API |
---|
| 955 | ****************************************************************************/ |
---|
| 956 | |
---|
| 957 | rtems_device_driver SciOpen ( |
---|
| 958 | rtems_device_major_number major, |
---|
| 959 | rtems_device_minor_number minor, |
---|
| 960 | void * arg |
---|
| 961 | ) |
---|
| 962 | { |
---|
[da2fc6c0] | 963 | /*printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); */ |
---|
[274fa77] | 964 | |
---|
[da2fc6c0] | 965 | if (SciInited == 0) /* must be initialized first! */ |
---|
[274fa77] | 966 | { |
---|
| 967 | return RTEMS_NOT_CONFIGURED; |
---|
| 968 | } |
---|
| 969 | |
---|
| 970 | if (minor != SCI_MINOR) |
---|
| 971 | { |
---|
[da2fc6c0] | 972 | return RTEMS_INVALID_NAME; /* verify minor number */ |
---|
[274fa77] | 973 | } |
---|
| 974 | |
---|
| 975 | if (SciOpened == DRIVER_OPENED) |
---|
| 976 | { |
---|
[da2fc6c0] | 977 | return RTEMS_RESOURCE_IN_USE; /* already opened! */ |
---|
[274fa77] | 978 | } |
---|
| 979 | |
---|
[da2fc6c0] | 980 | SciOpened = DRIVER_OPENED; /* set the opened flag */ |
---|
[274fa77] | 981 | |
---|
| 982 | return RTEMS_SUCCESSFUL; |
---|
| 983 | } |
---|
| 984 | |
---|
| 985 | |
---|
| 986 | /**************************************************************************** |
---|
| 987 | * Func: SciClose |
---|
| 988 | * Desc: device driver close routine |
---|
| 989 | * the device must be opened before you can close it |
---|
| 990 | * the device must be closed before someone (else) can open it |
---|
| 991 | * Inputs: major - the major device number |
---|
| 992 | * minor - the minor device number |
---|
| 993 | * arg - ????? |
---|
| 994 | * Outputs: see below |
---|
| 995 | * Errors: none |
---|
| 996 | * Scope: public API |
---|
| 997 | ****************************************************************************/ |
---|
| 998 | |
---|
| 999 | rtems_device_driver SciClose ( |
---|
| 1000 | rtems_device_major_number major, |
---|
| 1001 | rtems_device_minor_number minor, |
---|
| 1002 | void * arg |
---|
| 1003 | ) |
---|
| 1004 | { |
---|
[da2fc6c0] | 1005 | /*printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); */ |
---|
[274fa77] | 1006 | |
---|
| 1007 | if (minor != SCI_MINOR) |
---|
| 1008 | { |
---|
[da2fc6c0] | 1009 | return RTEMS_INVALID_NAME; /* check the minor number */ |
---|
[274fa77] | 1010 | } |
---|
| 1011 | |
---|
| 1012 | if (SciOpened != DRIVER_OPENED) |
---|
| 1013 | { |
---|
[da2fc6c0] | 1014 | return RTEMS_INCORRECT_STATE; /* must be opened first */ |
---|
[274fa77] | 1015 | } |
---|
| 1016 | |
---|
[da2fc6c0] | 1017 | SciOpened = DRIVER_CLOSED; /* set the flag */ |
---|
[274fa77] | 1018 | |
---|
| 1019 | return RTEMS_SUCCESSFUL; |
---|
| 1020 | } |
---|
| 1021 | |
---|
| 1022 | |
---|
| 1023 | /**************************************************************************** |
---|
| 1024 | * Func: SciRead |
---|
| 1025 | * Desc: device driver read routine |
---|
| 1026 | * this function is not meaningful for the laser devices |
---|
| 1027 | * Inputs: major - the major device number |
---|
| 1028 | * minor - the minor device number |
---|
| 1029 | * arg - read/write arguments |
---|
| 1030 | * Outputs: see below |
---|
| 1031 | * Errors: none |
---|
| 1032 | * Scope: public API |
---|
| 1033 | ****************************************************************************/ |
---|
| 1034 | |
---|
| 1035 | rtems_device_driver SciRead ( |
---|
| 1036 | rtems_device_major_number major, |
---|
| 1037 | rtems_device_minor_number minor, |
---|
| 1038 | void *arg |
---|
| 1039 | ) |
---|
| 1040 | { |
---|
[da2fc6c0] | 1041 | rtems_libio_rw_args_t *rw_args; /* ptr to argument struct */ |
---|
| 1042 | char *buffer; |
---|
[f74d9f1f] | 1043 | uint16_t length; |
---|
[6128a4a] | 1044 | |
---|
[da2fc6c0] | 1045 | rw_args = (rtems_libio_rw_args_t *) arg; /* arguments to read() */ |
---|
[274fa77] | 1046 | |
---|
| 1047 | if (minor != SCI_MINOR) |
---|
| 1048 | { |
---|
[da2fc6c0] | 1049 | return RTEMS_INVALID_NAME; /* check the minor number */ |
---|
[274fa77] | 1050 | } |
---|
| 1051 | |
---|
| 1052 | if (SciOpened == DRIVER_CLOSED) |
---|
| 1053 | { |
---|
[da2fc6c0] | 1054 | return RTEMS_INCORRECT_STATE; /* must be opened first */ |
---|
[274fa77] | 1055 | } |
---|
| 1056 | |
---|
[da2fc6c0] | 1057 | buffer = rw_args->buffer; /* points to user's buffer */ |
---|
[274fa77] | 1058 | |
---|
[da2fc6c0] | 1059 | length = rw_args->count; /* how many bytes they want */ |
---|
[274fa77] | 1060 | |
---|
[da2fc6c0] | 1061 | /* *buffer = SciReadCharWait(); wait for a character */ |
---|
[274fa77] | 1062 | |
---|
[da2fc6c0] | 1063 | /* if there isn't a character available, wait until one shows up */ |
---|
| 1064 | /* or the timeout period expires, which ever happens first */ |
---|
[274fa77] | 1065 | |
---|
[da2fc6c0] | 1066 | if ( SciRcvBufCount == 0 ) /* no chars */ |
---|
[274fa77] | 1067 | { |
---|
[da2fc6c0] | 1068 | /* wait for someone to wake me up... */ |
---|
| 1069 | /*rtems_task_wake_after(SciReadTimeout); */ |
---|
[274fa77] | 1070 | } |
---|
| 1071 | |
---|
[da2fc6c0] | 1072 | if ( SciRcvBufCount ) /* any characters locally? */ |
---|
[274fa77] | 1073 | { |
---|
[da2fc6c0] | 1074 | *buffer = SciRcvBufGetChar(); /* get the character */ |
---|
[274fa77] | 1075 | |
---|
[da2fc6c0] | 1076 | rw_args->bytes_moved = 1; /* how many we actually read */ |
---|
[274fa77] | 1077 | } |
---|
| 1078 | |
---|
| 1079 | return RTEMS_SUCCESSFUL; |
---|
| 1080 | } |
---|
| 1081 | |
---|
| 1082 | |
---|
| 1083 | /**************************************************************************** |
---|
| 1084 | * Func: SciWrite |
---|
| 1085 | * Desc: device driver write routine |
---|
| 1086 | * this function is not meaningful for the laser devices |
---|
| 1087 | * Inputs: major - the major device number |
---|
| 1088 | * minor - the minor device number |
---|
| 1089 | * arg - read/write arguments |
---|
| 1090 | * Outputs: see below |
---|
| 1091 | * Errors: non3 |
---|
| 1092 | * Scope: public API |
---|
| 1093 | ****************************************************************************/ |
---|
| 1094 | |
---|
| 1095 | rtems_device_driver SciWrite ( |
---|
| 1096 | rtems_device_major_number major, |
---|
| 1097 | rtems_device_minor_number minor, |
---|
| 1098 | void * arg |
---|
| 1099 | ) |
---|
| 1100 | { |
---|
[da2fc6c0] | 1101 | rtems_libio_rw_args_t *rw_args; /* ptr to argument struct */ |
---|
[f74d9f1f] | 1102 | uint8_t *buffer; |
---|
| 1103 | uint16_t length; |
---|
[6128a4a] | 1104 | |
---|
[274fa77] | 1105 | rw_args = (rtems_libio_rw_args_t *) arg; |
---|
| 1106 | |
---|
| 1107 | if (minor != SCI_MINOR) |
---|
| 1108 | { |
---|
[da2fc6c0] | 1109 | return RTEMS_INVALID_NAME; /* check the minor number */ |
---|
[274fa77] | 1110 | } |
---|
| 1111 | |
---|
| 1112 | if (SciOpened == DRIVER_CLOSED) |
---|
| 1113 | { |
---|
[da2fc6c0] | 1114 | return RTEMS_INCORRECT_STATE; /* must be opened first */ |
---|
[274fa77] | 1115 | } |
---|
| 1116 | |
---|
[da2fc6c0] | 1117 | buffer = (uint8_t*)rw_args->buffer; /* points to data */ |
---|
[274fa77] | 1118 | |
---|
[da2fc6c0] | 1119 | length = rw_args->count; /* how many bytes */ |
---|
[274fa77] | 1120 | |
---|
| 1121 | while (length--) |
---|
| 1122 | { |
---|
[da2fc6c0] | 1123 | SciWriteCharWait(*buffer++); /* send the bytes out */ |
---|
[274fa77] | 1124 | } |
---|
| 1125 | |
---|
[da2fc6c0] | 1126 | rw_args->bytes_moved = rw_args->count; /* how many we wrote */ |
---|
[274fa77] | 1127 | |
---|
| 1128 | return RTEMS_SUCCESSFUL; |
---|
| 1129 | } |
---|
| 1130 | |
---|
| 1131 | |
---|
| 1132 | /**************************************************************************** |
---|
| 1133 | * Func: SciControl |
---|
| 1134 | * Desc: device driver control routine |
---|
| 1135 | * see below for an example of how to use the ioctl interface |
---|
| 1136 | * Inputs: major - the major device number |
---|
| 1137 | * minor - the minor device number |
---|
| 1138 | * arg - io control args |
---|
| 1139 | * Outputs: see below |
---|
| 1140 | * Errors: none |
---|
| 1141 | * Scope: public API |
---|
| 1142 | ****************************************************************************/ |
---|
| 1143 | |
---|
| 1144 | rtems_device_driver SciControl ( |
---|
| 1145 | rtems_device_major_number major, |
---|
| 1146 | rtems_device_minor_number minor, |
---|
| 1147 | void * arg |
---|
| 1148 | ) |
---|
| 1149 | { |
---|
[da2fc6c0] | 1150 | rtems_libio_ioctl_args_t *args = arg; /* rtems arg struct */ |
---|
| 1151 | uint16_t command; /* the cmd to execute */ |
---|
| 1152 | uint16_t unused; /* maybe later */ |
---|
| 1153 | uint16_t *ptr; /* ptr to user data */ |
---|
[6128a4a] | 1154 | |
---|
[da2fc6c0] | 1155 | /*printk("%s major=%d minor=%d\r\n", __FUNCTION__,major,minor); */ |
---|
[274fa77] | 1156 | |
---|
[da2fc6c0] | 1157 | /* do some sanity checking */ |
---|
[274fa77] | 1158 | |
---|
| 1159 | if (minor != SCI_MINOR) |
---|
| 1160 | { |
---|
[da2fc6c0] | 1161 | return RTEMS_INVALID_NAME; /* check the minor number */ |
---|
[274fa77] | 1162 | } |
---|
| 1163 | |
---|
| 1164 | if (SciOpened == DRIVER_CLOSED) |
---|
| 1165 | { |
---|
[da2fc6c0] | 1166 | return RTEMS_INCORRECT_STATE; /* must be open first */ |
---|
[274fa77] | 1167 | } |
---|
| 1168 | |
---|
| 1169 | if (args == 0) |
---|
| 1170 | { |
---|
[da2fc6c0] | 1171 | return RTEMS_INVALID_ADDRESS; /* must have args */ |
---|
[274fa77] | 1172 | } |
---|
| 1173 | |
---|
[da2fc6c0] | 1174 | args->ioctl_return = -1; /* assume an error */ |
---|
[274fa77] | 1175 | |
---|
[da2fc6c0] | 1176 | command = args->command; /* get the command */ |
---|
| 1177 | ptr = args->buffer; /* this is an address */ |
---|
| 1178 | unused = *ptr; /* brightness */ |
---|
[274fa77] | 1179 | |
---|
[da2fc6c0] | 1180 | if (command == SCI_SEND_BREAK) /* process the command */ |
---|
[274fa77] | 1181 | { |
---|
[da2fc6c0] | 1182 | SciSendBreak(); /* send break char */ |
---|
[274fa77] | 1183 | } |
---|
| 1184 | |
---|
[da2fc6c0] | 1185 | args->ioctl_return = 0; /* return status */ |
---|
[274fa77] | 1186 | |
---|
| 1187 | return RTEMS_SUCCESSFUL; |
---|
| 1188 | } |
---|
| 1189 | |
---|
| 1190 | |
---|
[da2fc6c0] | 1191 | /* |
---|
| 1192 | * |
---|
| 1193 | * SECTION 5 |
---|
| 1194 | * HARDWARE LEVEL ROUTINES |
---|
| 1195 | */ |
---|
[274fa77] | 1196 | |
---|
| 1197 | /**************************************************************************** |
---|
| 1198 | * Func: SciSetBaud |
---|
| 1199 | * Desc: setup the uart based on the termios modules requests |
---|
| 1200 | * Inputs: baud rate |
---|
| 1201 | * Outputs: none |
---|
| 1202 | * Errors: none |
---|
| 1203 | * Scope: private |
---|
| 1204 | ****************************************************************************/ |
---|
| 1205 | |
---|
[f74d9f1f] | 1206 | static void SciSetBaud(uint32_t rate) |
---|
[274fa77] | 1207 | { |
---|
[f74d9f1f] | 1208 | uint16_t value; |
---|
| 1209 | uint16_t save_sccr1; |
---|
[274fa77] | 1210 | |
---|
[da2fc6c0] | 1211 | /* when you open the console you need to set the termio struct baud rate */ |
---|
| 1212 | /* it has a default value of 9600, when someone calls tcsetattr it reverts! */ |
---|
[274fa77] | 1213 | |
---|
[da2fc6c0] | 1214 | SciBaud = rate; /* save the rate */ |
---|
[274fa77] | 1215 | |
---|
[da2fc6c0] | 1216 | /* calculate the register value as a float and convert to an int */ |
---|
| 1217 | /* set baud rate - you must define the system clock constant */ |
---|
| 1218 | /* see mrm332.h for an example */ |
---|
[274fa77] | 1219 | |
---|
[f74d9f1f] | 1220 | value = ( (uint16_t) ( SYS_CLOCK / rate / 32.0 + 0.5 ) & 0x1fff ); |
---|
[274fa77] | 1221 | |
---|
[da2fc6c0] | 1222 | save_sccr1 = *SCCR1; /* save register */ |
---|
[274fa77] | 1223 | |
---|
[da2fc6c0] | 1224 | /* also turns off the xmtr and rcvr */ |
---|
[274fa77] | 1225 | |
---|
[da2fc6c0] | 1226 | *SCCR1 &= SCI_DISABLE_INT_ALL; /* disable interrupts */ |
---|
[274fa77] | 1227 | |
---|
[da2fc6c0] | 1228 | *SCCR0 = value; /* write the register */ |
---|
[274fa77] | 1229 | |
---|
[da2fc6c0] | 1230 | *SCCR1 = save_sccr1; /* restore register */ |
---|
[274fa77] | 1231 | |
---|
| 1232 | return; |
---|
| 1233 | } |
---|
| 1234 | |
---|
| 1235 | |
---|
| 1236 | /**************************************************************************** |
---|
| 1237 | * Func: SciSetParity |
---|
| 1238 | * Desc: setup the uart based on the termios modules requests |
---|
| 1239 | * Inputs: parity |
---|
| 1240 | * Outputs: none |
---|
| 1241 | * Errors: none |
---|
| 1242 | * Scope: private |
---|
| 1243 | ****************************************************************************/ |
---|
| 1244 | |
---|
[f74d9f1f] | 1245 | static void SciSetParity(uint16_t parity) |
---|
[274fa77] | 1246 | { |
---|
[f74d9f1f] | 1247 | uint16_t value; |
---|
[274fa77] | 1248 | |
---|
[da2fc6c0] | 1249 | value = *SCCR1; /* get the register */ |
---|
[274fa77] | 1250 | |
---|
| 1251 | if (parity == SCI_PARITY_ODD) |
---|
| 1252 | { |
---|
[da2fc6c0] | 1253 | value |= SCI_PARITY_ENABLE; /* parity enabled */ |
---|
| 1254 | value |= SCI_PARITY_ODD; /* parity odd */ |
---|
[274fa77] | 1255 | } |
---|
| 1256 | |
---|
| 1257 | else if (parity == SCI_PARITY_EVEN) |
---|
| 1258 | { |
---|
[da2fc6c0] | 1259 | value |= SCI_PARITY_ENABLE; /* parity enabled */ |
---|
| 1260 | value &= ~SCI_PARITY_ODD; /* parity even */ |
---|
[274fa77] | 1261 | } |
---|
| 1262 | |
---|
| 1263 | else if (parity == SCI_PARITY_NONE) |
---|
| 1264 | { |
---|
[da2fc6c0] | 1265 | value &= ~SCI_PARITY_ENABLE; /* disabled, most common */ |
---|
[274fa77] | 1266 | } |
---|
| 1267 | |
---|
| 1268 | /* else no changes */ |
---|
| 1269 | |
---|
[da2fc6c0] | 1270 | *SCCR1 = value; /* write the register */ |
---|
[274fa77] | 1271 | |
---|
| 1272 | return; |
---|
| 1273 | } |
---|
| 1274 | |
---|
| 1275 | |
---|
| 1276 | /**************************************************************************** |
---|
| 1277 | * Func: SciSetDataBits |
---|
| 1278 | * Desc: setup the uart based on the termios modules requests |
---|
| 1279 | * Inputs: data bits |
---|
| 1280 | * Outputs: none |
---|
| 1281 | * Errors: none |
---|
| 1282 | * Scope: private |
---|
| 1283 | ****************************************************************************/ |
---|
| 1284 | |
---|
[f74d9f1f] | 1285 | static void SciSetDataBits(uint16_t bits) |
---|
[274fa77] | 1286 | { |
---|
[f74d9f1f] | 1287 | uint16_t value; |
---|
[274fa77] | 1288 | |
---|
[da2fc6c0] | 1289 | value = *SCCR1; /* get the register */ |
---|
[274fa77] | 1290 | |
---|
| 1291 | /* note - the parity setting affects the number of data bits */ |
---|
| 1292 | |
---|
| 1293 | if (bits == SCI_9_DATA_BITS) |
---|
| 1294 | { |
---|
[da2fc6c0] | 1295 | value |= SCI_9_DATA_BITS; /* 9 data bits */ |
---|
[274fa77] | 1296 | } |
---|
| 1297 | |
---|
| 1298 | else if (bits == SCI_8_DATA_BITS) |
---|
| 1299 | { |
---|
[da2fc6c0] | 1300 | value &= SCI_8_DATA_BITS; /* 8 data bits */ |
---|
[274fa77] | 1301 | } |
---|
| 1302 | |
---|
| 1303 | /* else no changes */ |
---|
| 1304 | |
---|
[da2fc6c0] | 1305 | *SCCR1 = value; /* write the register */ |
---|
[274fa77] | 1306 | |
---|
| 1307 | return; |
---|
| 1308 | } |
---|
| 1309 | |
---|
| 1310 | |
---|
| 1311 | /**************************************************************************** |
---|
| 1312 | * Func: SciDisableAllInterrupts |
---|
| 1313 | * Func: SciEnableTransmitInterrupts |
---|
| 1314 | * Func: SciEnableReceiveInterrupts |
---|
| 1315 | * Desc: handles generation of interrupts by the sci module |
---|
| 1316 | * Inputs: none |
---|
| 1317 | * Outputs: none |
---|
| 1318 | * Errors: none |
---|
| 1319 | * Scope: private |
---|
| 1320 | ****************************************************************************/ |
---|
| 1321 | |
---|
| 1322 | static void inline SciDisableAllInterrupts( void ) |
---|
| 1323 | { |
---|
[da2fc6c0] | 1324 | /* this also turns off the xmtr and rcvr */ |
---|
[274fa77] | 1325 | |
---|
| 1326 | *SCCR1 &= SCI_DISABLE_INT_ALL; |
---|
| 1327 | } |
---|
| 1328 | |
---|
| 1329 | static void inline SciEnableReceiveInterrupts( void ) |
---|
| 1330 | { |
---|
| 1331 | *SCCR1 |= SCI_ENABLE_INT_RX; |
---|
| 1332 | } |
---|
| 1333 | |
---|
| 1334 | static void inline SciDisableReceiveInterrupts( void ) |
---|
| 1335 | { |
---|
| 1336 | *SCCR1 &= SCI_DISABLE_INT_RX; |
---|
| 1337 | } |
---|
| 1338 | |
---|
| 1339 | static void inline SciEnableTransmitInterrupts( void ) |
---|
| 1340 | { |
---|
| 1341 | *SCCR1 |= SCI_ENABLE_INT_TX; |
---|
| 1342 | } |
---|
| 1343 | |
---|
| 1344 | static void inline SciDisableTransmitInterrupts( void ) |
---|
| 1345 | { |
---|
| 1346 | *SCCR1 &= SCI_DISABLE_INT_TX; |
---|
| 1347 | } |
---|
| 1348 | |
---|
| 1349 | |
---|
| 1350 | /**************************************************************************** |
---|
| 1351 | * Func: SciEnableTransmitter, SciDisableTransmitter |
---|
| 1352 | * Func: SciEnableReceiver, SciDisableReceiver |
---|
| 1353 | * Desc: turns the transmitter and receiver on and off |
---|
| 1354 | * Inputs: none |
---|
| 1355 | * Outputs: none |
---|
| 1356 | * Errors: none |
---|
| 1357 | * Scope: private |
---|
| 1358 | ****************************************************************************/ |
---|
| 1359 | |
---|
| 1360 | static void inline SciEnableTransmitter( void ) |
---|
| 1361 | { |
---|
| 1362 | *SCCR1 |= SCI_ENABLE_XMTR; |
---|
| 1363 | } |
---|
| 1364 | |
---|
| 1365 | static void inline SciDisableTransmitter( void ) |
---|
| 1366 | { |
---|
| 1367 | *SCCR1 &= SCI_DISABLE_XMTR; |
---|
| 1368 | } |
---|
| 1369 | |
---|
| 1370 | static void inline SciEnableReceiver( void ) |
---|
| 1371 | { |
---|
| 1372 | *SCCR1 |= SCI_ENABLE_RCVR; |
---|
| 1373 | } |
---|
| 1374 | |
---|
| 1375 | static void inline SciDisableReceiver( void ) |
---|
| 1376 | { |
---|
| 1377 | *SCCR1 &= SCI_DISABLE_RCVR; |
---|
| 1378 | } |
---|
| 1379 | |
---|
| 1380 | |
---|
| 1381 | /**************************************************************************** |
---|
| 1382 | * Func: SciWriteCharWait |
---|
| 1383 | * Desc: wait for room in the fifo and then put a char in |
---|
| 1384 | * Inputs: a byte to send |
---|
| 1385 | * Outputs: none |
---|
| 1386 | * Errors: none |
---|
| 1387 | * Scope: public |
---|
| 1388 | ****************************************************************************/ |
---|
| 1389 | |
---|
[f74d9f1f] | 1390 | void SciWriteCharWait(uint8_t c) |
---|
[274fa77] | 1391 | { |
---|
[da2fc6c0] | 1392 | /* poll the fifo, waiting for room for another character */ |
---|
[274fa77] | 1393 | |
---|
| 1394 | while ( ( *SCSR & SCI_XMTR_AVAILABLE ) == 0 ) |
---|
| 1395 | { |
---|
| 1396 | /* Either we are writing to the fifo faster than |
---|
| 1397 | * the uart can clock bytes out onto the cable, |
---|
| 1398 | * or we are in flow control (actually no, we |
---|
| 1399 | * are ignoring flow control from the other end). |
---|
| 1400 | * In the first case, higher baud rates will help. |
---|
| 1401 | */ |
---|
[c0c6168] | 1402 | /* relinquish processor while waiting */ |
---|
| 1403 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
[274fa77] | 1404 | } |
---|
| 1405 | |
---|
[da2fc6c0] | 1406 | *SCDR = c; /* send the charcter */ |
---|
[274fa77] | 1407 | |
---|
[da2fc6c0] | 1408 | SciBytesOut++; /* increment the counter */ |
---|
[274fa77] | 1409 | |
---|
| 1410 | return; |
---|
| 1411 | } |
---|
| 1412 | |
---|
| 1413 | /**************************************************************************** |
---|
| 1414 | * Func: SciWriteCharNoWait |
---|
| 1415 | * Desc: if no room in the fifo throw the char on the floor |
---|
| 1416 | * Inputs: a byte to send |
---|
| 1417 | * Outputs: none |
---|
| 1418 | * Errors: none |
---|
| 1419 | * Scope: public |
---|
| 1420 | ****************************************************************************/ |
---|
| 1421 | |
---|
[f74d9f1f] | 1422 | void SciWriteCharNoWait(uint8_t c) |
---|
[274fa77] | 1423 | { |
---|
| 1424 | if ( ( *SCSR & SCI_XMTR_AVAILABLE ) == 0 ) |
---|
| 1425 | { |
---|
[da2fc6c0] | 1426 | return; /* no room, throw it away */ |
---|
[274fa77] | 1427 | } |
---|
| 1428 | |
---|
[da2fc6c0] | 1429 | *SCDR = c; /* put the char in the fifo */ |
---|
[274fa77] | 1430 | |
---|
[da2fc6c0] | 1431 | SciBytesOut++; /* increment the counter */ |
---|
[274fa77] | 1432 | |
---|
| 1433 | return; |
---|
| 1434 | } |
---|
| 1435 | |
---|
| 1436 | |
---|
| 1437 | /**************************************************************************** |
---|
| 1438 | * Func: SciReadCharWait |
---|
| 1439 | * Desc: read a character, waiting for one to show up, if need be |
---|
| 1440 | * Inputs: none |
---|
| 1441 | * Outputs: a character |
---|
| 1442 | * Errors: none |
---|
| 1443 | * Scope: public |
---|
| 1444 | ****************************************************************************/ |
---|
| 1445 | |
---|
[f74d9f1f] | 1446 | uint8_t inline SciReadCharWait( void ) |
---|
[274fa77] | 1447 | { |
---|
[f74d9f1f] | 1448 | uint8_t ch; |
---|
[274fa77] | 1449 | |
---|
[da2fc6c0] | 1450 | while ( SciCharAvailable() == 0 ) /* anything there? */ |
---|
[274fa77] | 1451 | { |
---|
[c0c6168] | 1452 | /* relinquish processor while waiting */ |
---|
| 1453 | rtems_task_wake_after(RTEMS_YIELD_PROCESSOR); |
---|
[274fa77] | 1454 | } |
---|
| 1455 | |
---|
[da2fc6c0] | 1456 | /* if you have rcv ints enabled, then the isr will probably */ |
---|
| 1457 | /* get the character before you will unless you turn off ints */ |
---|
| 1458 | /* ie polling and ints don't mix that well */ |
---|
[274fa77] | 1459 | |
---|
[da2fc6c0] | 1460 | ch = *SCDR; /* get the charcter */ |
---|
[274fa77] | 1461 | |
---|
[da2fc6c0] | 1462 | SciBytesIn++; /* increment the counter */ |
---|
[274fa77] | 1463 | |
---|
[da2fc6c0] | 1464 | return ch; /* return the char */ |
---|
[274fa77] | 1465 | } |
---|
| 1466 | |
---|
| 1467 | /**************************************************************************** |
---|
| 1468 | * Func: SciReadCharNoWait |
---|
| 1469 | * Desc: try to get a char but dont wait for one |
---|
| 1470 | * Inputs: none |
---|
| 1471 | * Outputs: a character or -1 if none |
---|
| 1472 | * Errors: none |
---|
| 1473 | * Scope: public |
---|
| 1474 | ****************************************************************************/ |
---|
| 1475 | |
---|
[f74d9f1f] | 1476 | uint8_t inline SciReadCharNoWait( void ) |
---|
[274fa77] | 1477 | { |
---|
[f74d9f1f] | 1478 | uint8_t ch; |
---|
[274fa77] | 1479 | |
---|
[da2fc6c0] | 1480 | if ( SciCharAvailable() == 0 ) /* anything there? */ |
---|
[274fa77] | 1481 | return -1; |
---|
| 1482 | |
---|
[da2fc6c0] | 1483 | ch = *SCDR; /* get the character */ |
---|
[274fa77] | 1484 | |
---|
[da2fc6c0] | 1485 | SciBytesIn++; /* increment the count */ |
---|
[274fa77] | 1486 | |
---|
[da2fc6c0] | 1487 | return ch; /* return the char */ |
---|
[274fa77] | 1488 | } |
---|
| 1489 | |
---|
| 1490 | |
---|
| 1491 | /**************************************************************************** |
---|
| 1492 | * Func: SciCharAvailable |
---|
| 1493 | * Desc: is there a receive character in the data register |
---|
| 1494 | * Inputs: none |
---|
| 1495 | * Outputs: false if no char available, else true |
---|
| 1496 | * Errors: none |
---|
| 1497 | * Scope: public |
---|
| 1498 | ****************************************************************************/ |
---|
| 1499 | |
---|
[f74d9f1f] | 1500 | uint8_t inline SciCharAvailable( void ) |
---|
[274fa77] | 1501 | { |
---|
[da2fc6c0] | 1502 | return ( *SCSR & SCI_RCVR_READY ); /* char in data register? */ |
---|
[274fa77] | 1503 | } |
---|
| 1504 | |
---|
| 1505 | |
---|
| 1506 | /**************************************************************************** |
---|
| 1507 | * Func: SciSendBreak |
---|
| 1508 | * Desc: send 1 or tow breaks (all zero bits) |
---|
| 1509 | * Inputs: none |
---|
| 1510 | * Outputs: none |
---|
| 1511 | * Errors: none |
---|
| 1512 | * Scope: public |
---|
| 1513 | ****************************************************************************/ |
---|
| 1514 | |
---|
| 1515 | void SciSendBreak( void ) |
---|
| 1516 | { |
---|
[da2fc6c0] | 1517 | /* From the Motorola QSM reference manual - */ |
---|
[274fa77] | 1518 | |
---|
[da2fc6c0] | 1519 | /* "if SBK is toggled by writing it first to a one and then immediately */ |
---|
| 1520 | /* to a zero (in less than one serial frame interval), the transmitter */ |
---|
| 1521 | /* sends only one or two break frames before reverting to mark (idle) */ |
---|
| 1522 | /* or before commencing to send more data" */ |
---|
[274fa77] | 1523 | |
---|
[da2fc6c0] | 1524 | *SCCR1 |= SCI_SEND_BREAK; /* set the bit */ |
---|
[274fa77] | 1525 | |
---|
[da2fc6c0] | 1526 | *SCCR1 &= ~SCI_SEND_BREAK; /* clear the bit */ |
---|
[274fa77] | 1527 | |
---|
| 1528 | return; |
---|
| 1529 | } |
---|
| 1530 | |
---|
| 1531 | |
---|
[da2fc6c0] | 1532 | /* |
---|
| 1533 | * |
---|
| 1534 | * SECTION 6 |
---|
| 1535 | * TEST CODE |
---|
| 1536 | */ |
---|
[274fa77] | 1537 | |
---|
| 1538 | /**************************************************************************** |
---|
| 1539 | * Func: SciUnitTest |
---|
| 1540 | * Desc: test the device driver |
---|
| 1541 | * Inputs: nothing |
---|
| 1542 | * Outputs: nothing |
---|
| 1543 | * Scope: public |
---|
| 1544 | ****************************************************************************/ |
---|
| 1545 | |
---|
[0b6d74d0] | 1546 | #if 0 |
---|
[da2fc6c0] | 1547 | #define O_RDWR LIBIO_FLAGS_READ_WRITE /* dont like this but... */ |
---|
[274fa77] | 1548 | |
---|
| 1549 | void SciUnitTest() |
---|
| 1550 | { |
---|
[da2fc6c0] | 1551 | uint8_t byte; /* a character */ |
---|
| 1552 | uint16_t fd; /* file descriptor for device */ |
---|
| 1553 | uint16_t result; /* result of ioctl */ |
---|
[274fa77] | 1554 | |
---|
[da2fc6c0] | 1555 | fd = open("/dev/sci",O_RDWR); /* open the device */ |
---|
[274fa77] | 1556 | |
---|
| 1557 | printk("SCI open fd=%d\r\n",fd); |
---|
| 1558 | |
---|
[da2fc6c0] | 1559 | result = write(fd, "abcd\r\n", 6); /* send a string */ |
---|
[274fa77] | 1560 | |
---|
| 1561 | printk("SCI write result=%d\r\n",result); |
---|
| 1562 | |
---|
[da2fc6c0] | 1563 | result = read(fd, &byte, 1); /* read a byte */ |
---|
[274fa77] | 1564 | |
---|
| 1565 | printk("SCI read result=%d,byte=%x\r\n",result,byte); |
---|
| 1566 | |
---|
| 1567 | return; |
---|
| 1568 | } |
---|
[0b6d74d0] | 1569 | #endif |
---|
[274fa77] | 1570 | |
---|
| 1571 | |
---|
| 1572 | /**************************************************************************** |
---|
| 1573 | * Func: SciPrintStats |
---|
| 1574 | * Desc: print out some driver information |
---|
| 1575 | * Inputs: nothing |
---|
| 1576 | * Outputs: nothing |
---|
| 1577 | * Scope: public |
---|
| 1578 | ****************************************************************************/ |
---|
| 1579 | |
---|
| 1580 | void SciPrintStats ( void ) |
---|
| 1581 | { |
---|
[0b6d74d0] | 1582 | printk("\r\n"); |
---|
[274fa77] | 1583 | |
---|
[0b6d74d0] | 1584 | printk( "SYS_CLOCK is %2.6f Mhz\r\n\n", SYS_CLOCK / 1000000.0 ); |
---|
[274fa77] | 1585 | |
---|
[0b6d74d0] | 1586 | printk( "Current baud rate is %d bps or %d cps\r\n\n", SciBaud, SciBaud / 10 ); |
---|
[274fa77] | 1587 | |
---|
[0b6d74d0] | 1588 | printk( "SCI Uart chars in %8d\r\n", SciBytesIn ); |
---|
| 1589 | printk( "SCI Uart chars out %8d\r\n", SciBytesOut ); |
---|
| 1590 | printk( "SCI Uart framing errors %8d\r\n", SciErrorsFraming ); |
---|
| 1591 | printk( "SCI Uart parity errors %8d\r\n", SciErrorsParity ); |
---|
| 1592 | printk( "SCI Uart overrun errors %8d\r\n", SciErrorsOverrun ); |
---|
| 1593 | printk( "SCI Uart noise errors %8d\r\n", SciErrorsNoise ); |
---|
[274fa77] | 1594 | |
---|
| 1595 | return; |
---|
| 1596 | } |
---|