[4a238002] | 1 | /* |
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| 2 | * /dev/sci[0|1] for Hitachi SH 704X |
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| 3 | * |
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| 4 | * The SH doesn't have a designated console device. Therefore we "alias" |
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| 5 | * another device as /dev/console and revector all calls to /dev/console |
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| 6 | * to this device. |
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| 7 | * |
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| 8 | * This approach is similar to installing a sym-link from one device to |
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| 9 | * another device. If rtems once will support sym-links for devices files, |
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| 10 | * this implementation could be dropped. |
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| 11 | * |
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| 12 | * Author: Ralf Corsepius (corsepiu@faw.uni-ulm.de) |
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| 13 | * |
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| 14 | * COPYRIGHT (c) 1997-1998, FAW Ulm, Germany |
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| 15 | * |
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| 16 | * This program is distributed in the hope that it will be useful, |
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
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| 19 | * |
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| 20 | * |
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| 21 | * COPYRIGHT (c) 1998. |
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| 22 | * On-Line Applications Research Corporation (OAR). |
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| 23 | * Copyright assigned to U.S. Government, 1994. |
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| 24 | * |
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| 25 | * The license and distribution terms for this file may be |
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| 26 | * found in the file LICENSE in this distribution or at |
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| 27 | * http://www.OARcorp.com/rtems/license.html. |
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| 28 | * |
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| 29 | * Modified to reflect sh7045 processor: |
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| 30 | * John M. Mills (jmills@tga.com) |
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| 31 | * TGA Technologies, Inc. |
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| 32 | * 100 Pinnacle Way, Suite 140 |
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| 33 | * Norcross, GA 30071 U.S.A. |
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| 34 | * |
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| 35 | * This modified file may be copied and distributed in accordance |
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| 36 | * the above-referenced license. It is provided for critique and |
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| 37 | * developmental purposes without any warranty nor representation |
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| 38 | * by the authors or by TGA Technologies. |
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| 39 | * |
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| 40 | * $Id$ |
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| 41 | */ |
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| 42 | |
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| 43 | #include <rtems.h> |
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| 44 | |
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| 45 | #include <stdlib.h> |
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| 46 | |
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| 47 | #include <rtems/libio.h> |
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| 48 | #include <iosupp.h> |
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| 49 | #include <rtems/score/sh_io.h> |
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| 50 | #include <rtems/score/ispsh7045.h> |
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| 51 | #include <rtems/score/iosh7045.h> |
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| 52 | #include <sh/sh7_sci.h> |
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| 53 | #include <sh/io_types.h> |
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| 54 | #include <sh/sci.h> |
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| 55 | |
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| 56 | struct scidev_t { |
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| 57 | char * name ; |
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| 58 | rtems_device_minor_number minor ; |
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| 59 | unsigned short opened ; |
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| 60 | tcflag_t cflags ; |
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| 61 | } sci_device[2] = |
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| 62 | { |
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| 63 | { "/dev/sci0", 0, 0, B9600 | CS8 }, |
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| 64 | { "/dev/sci1", 0, 0, B9600 | CS8 } |
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| 65 | } ; |
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| 66 | |
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| 67 | /* local data structures maintain hardware configuration */ |
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| 68 | extern int _sci_get_brparms( |
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| 69 | tcflag_t cflag, |
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| 70 | unsigned char *smr, |
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| 71 | unsigned char *brr ); |
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| 72 | |
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| 73 | #if UNUSED |
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| 74 | static sci_setup_t sio_param[2]; |
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| 75 | #endif |
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| 76 | |
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| 77 | /* local functions operate SCI ports 0 and 1 */ |
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| 78 | /* called from polling routines or ISRs */ |
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| 79 | rtems_boolean wrtSCI0(unsigned char ch) |
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| 80 | { |
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| 81 | unsigned8 temp; |
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| 82 | rtems_boolean result=FALSE; |
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| 83 | |
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| 84 | if ((read8(SCI_SSR0) & SCI_TDRE) != 0x00) { |
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| 85 | /* Write the character to the TDR */ |
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| 86 | write8(ch, SCI_TDR0); |
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| 87 | /* Clear the TDRE bit */ |
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| 88 | temp = read8(SCI_SSR0) & ~SCI_TDRE; |
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| 89 | write8(temp, SCI_SSR0); |
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| 90 | result = TRUE; |
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| 91 | } |
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| 92 | return result; |
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| 93 | } /* wrtSCI0 */ |
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| 94 | |
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| 95 | rtems_boolean wrtSCI1(unsigned char ch) |
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| 96 | { |
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| 97 | unsigned8 temp; |
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| 98 | rtems_boolean result=FALSE; |
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| 99 | |
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| 100 | if ((read8(SCI_SSR1) & SCI_TDRE) != 0x00) { |
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| 101 | /* Write the character to the TDR */ |
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| 102 | write8(ch, SCI_TDR1); |
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| 103 | /* Clear the TDRE bit */ |
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| 104 | temp = read8(SCI_SSR1) & ~SCI_TDRE; |
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| 105 | write8(temp, SCI_SSR1); |
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| 106 | result = TRUE; |
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| 107 | } |
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| 108 | return result; |
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| 109 | } /* wrtSCI1 */ |
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| 110 | |
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| 111 | /* polled output steers byte to selected port */ |
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| 112 | void sh_sci_outbyte_polled( |
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| 113 | rtems_device_minor_number minor, |
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| 114 | char ch ) |
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| 115 | { |
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| 116 | if (minor == 0) /* blocks until port ready */ |
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| 117 | while (wrtSCI0(ch) != TRUE); /* SCI0*/ |
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| 118 | else |
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| 119 | while (wrtSCI1(ch) != TRUE); /* SCI1*/ |
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| 120 | } /* sh_sci_outbyte_polled */ |
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| 121 | |
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| 122 | /* Initial version calls polled output driver and blocks */ |
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| 123 | void outbyte( |
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| 124 | rtems_device_minor_number minor, |
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| 125 | char ch) |
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| 126 | { |
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| 127 | sh_sci_outbyte_polled(minor, (unsigned char)ch); |
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| 128 | } /* outbyte */ |
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| 129 | |
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| 130 | rtems_boolean rdSCI0(unsigned char *ch) |
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| 131 | { |
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| 132 | unsigned8 temp; |
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| 133 | rtems_boolean result=FALSE; |
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| 134 | |
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| 135 | if ((read8(SCI_SSR0) & SCI_RDRF) != 0x00) { |
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| 136 | /* Write the character to the TDR */ |
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| 137 | write8(*ch, SCI_RDR0); |
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| 138 | /* Clear the TDRE bit */ |
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| 139 | temp = read8(SCI_SSR0) & ~SCI_RDRF; |
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| 140 | write8(temp, SCI_SSR0); |
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| 141 | result = TRUE; |
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| 142 | } |
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| 143 | return result; |
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| 144 | } /* rdSCI0 */ |
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| 145 | |
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| 146 | rtems_boolean rdSCI1(unsigned char *ch) |
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| 147 | { |
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| 148 | unsigned8 temp; |
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| 149 | rtems_boolean result=FALSE; |
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| 150 | |
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| 151 | if ((read8(SCI_SSR1) & SCI_RDRF) != 0x00) { |
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| 152 | /* Write the character to the TDR */ |
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| 153 | write8(*ch, SCI_RDR1); |
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| 154 | /* Clear the TDRE bit */ |
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| 155 | temp= read8(SCI_SSR1) & ~SCI_RDRF; |
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| 156 | write8(temp, SCI_SSR1); |
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| 157 | result = TRUE; |
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| 158 | } |
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| 159 | return result; |
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| 160 | } /* rdSCI1 */ |
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| 161 | |
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| 162 | |
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| 163 | /* initial version pulls byte from selected port */ |
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| 164 | char sh_sci_inbyte_polled( |
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| 165 | rtems_device_minor_number minor ) |
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| 166 | { |
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| 167 | char ch; |
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| 168 | |
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| 169 | if (minor == 0) /* blocks until char.ready */ |
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| 170 | while (rdSCI0(&ch) != TRUE); /* SCI0 */ |
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| 171 | else |
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| 172 | while (rdSCI1(&ch) != TRUE); /* SCI1 */ |
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| 173 | return ch; |
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| 174 | } /* sh_sci_inbyte_polled */ |
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| 175 | |
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| 176 | /* Initial version calls polled input driver */ |
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| 177 | char inbyte( |
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| 178 | rtems_device_minor_number minor ) |
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| 179 | { |
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| 180 | char ch; |
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| 181 | |
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| 182 | ch = sh_sci_inbyte_polled(minor); |
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| 183 | return ch; |
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| 184 | } /* inbyte */ |
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| 185 | |
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| 186 | |
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| 187 | /* sh_sci_initialize |
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| 188 | * |
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| 189 | * This routine initializes the sh_sci IO driver. |
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| 190 | * |
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| 191 | * Input parameters: NONE |
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| 192 | * |
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| 193 | * Output parameters: NONE |
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| 194 | * |
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| 195 | * Return values: |
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| 196 | */ |
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| 197 | |
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| 198 | rtems_device_driver sh_sci_initialize( |
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| 199 | rtems_device_major_number major, |
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| 200 | rtems_device_minor_number minor, |
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| 201 | void *arg ) |
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| 202 | { |
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| 203 | int a; |
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| 204 | unsigned16 temp16; |
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| 205 | rtems_device_driver status ; |
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| 206 | |
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| 207 | /* register devices */ |
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| 208 | for ( a = 0 ; a < 2 ; a++ ) |
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| 209 | { |
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| 210 | status = rtems_io_register_name( |
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| 211 | sci_device[a].name, |
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| 212 | major, |
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| 213 | sci_device[a].minor ); |
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| 214 | if (status != RTEMS_SUCCESSFUL) |
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| 215 | rtems_fatal_error_occurred(status); |
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| 216 | } |
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| 217 | |
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| 218 | /* default hardware setup */ |
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| 219 | |
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| 220 | /* general setup */ |
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| 221 | temp16 = read16(PFC_PECR1) | 0x0800; /* General I/O except pin 13 (reset) */ |
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| 222 | write16(temp16, PFC_PECR1); |
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| 223 | write16(0x00, PFC_PECR2); /* All I/O lines bits 7-0 */ |
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| 224 | temp16 = read16(PFC_PEIOR) | 0x0020; /* P5 to out, all other pins in */ |
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| 225 | write16(temp16, PFC_PEIOR); |
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| 226 | |
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| 227 | temp16 = read16(PFC_PACRL2) | 0x0145; /* PFC - pins for Tx0-1, Rx0-1 */ |
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| 228 | write16(temp16, PFC_PACRL2); |
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| 229 | |
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| 230 | return RTEMS_SUCCESSFUL; |
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| 231 | } |
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| 232 | |
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| 233 | |
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| 234 | /* |
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| 235 | * Open entry point |
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| 236 | */ |
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| 237 | |
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| 238 | rtems_device_driver sh_sci_open( |
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| 239 | rtems_device_major_number major, |
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| 240 | rtems_device_minor_number minor, |
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| 241 | void * arg ) |
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| 242 | { |
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| 243 | unsigned8 temp8; |
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| 244 | unsigned char smr ; |
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| 245 | unsigned char brr ; |
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| 246 | |
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| 247 | unsigned a ; |
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| 248 | |
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| 249 | /* device already opened */ |
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| 250 | if ( sci_device[minor].opened > 0 ) |
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| 251 | { |
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| 252 | sci_device[minor].opened++ ; |
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| 253 | |
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| 254 | return RTEMS_SUCCESSFUL ; |
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| 255 | } |
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| 256 | |
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| 257 | /* retrieve brr and smr values */ |
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| 258 | _sci_get_brparms( sci_device[minor].cflags, &smr, &brr ); |
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| 259 | |
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| 260 | if (minor == 0) { |
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| 261 | write8(0x00, SCI_SCR0); /* Clear SCR */ |
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| 262 | write8(smr, SCI_SMR0); /* Clear SMR */ |
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| 263 | write8(brr, SCI_BRR0); /* Default 9600 baud rate */ |
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| 264 | #if 0 |
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| 265 | write8(0x1F, SCI_BRR0); /* 28800 baud */ |
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| 266 | #endif |
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| 267 | /* FIXME: Will get optimized away */ |
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| 268 | for(a=0;a<10000L;a++); /* One bit delay */ |
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| 269 | write8(0x30, SCI_SCR0); /* Enable clock output */ |
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| 270 | temp8 = read8(SCI_RDR0); /* Clear out old input */ |
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| 271 | |
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| 272 | } else { |
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| 273 | write8(0x00, SCI_SCR1); /* Clear SCR */ |
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| 274 | write8(smr, SCI_SMR1); /* Clear SMR */ |
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| 275 | write8(brr, SCI_BRR1); /* Default 9600 baud rate */ |
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| 276 | #if 0 |
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| 277 | write8(0x1F, SCI_BRR1); /* 28800 baud */ |
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| 278 | #endif |
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| 279 | /* FIXME: Will get optimized away */ |
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| 280 | for(a=0;a<10000L;a++); /* One bit delay */ |
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| 281 | write8(0x30, SCI_SCR1); /* Enable clock output */ |
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| 282 | temp8 = read8(SCI_RDR1); /* Clear out old input */ |
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| 283 | } |
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| 284 | |
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| 285 | sci_device[minor].opened++ ; |
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| 286 | |
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| 287 | return RTEMS_SUCCESSFUL ; |
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| 288 | } |
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| 289 | |
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| 290 | /* |
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| 291 | * Close entry point |
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| 292 | */ |
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| 293 | |
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| 294 | rtems_device_driver sh_sci_close( |
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| 295 | rtems_device_major_number major, |
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| 296 | rtems_device_minor_number minor, |
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| 297 | void * arg |
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| 298 | ) |
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| 299 | { |
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| 300 | /* FIXME: Incomplete */ |
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| 301 | if ( sci_device[minor].opened > 0 ) |
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| 302 | sci_device[minor].opened-- ; |
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| 303 | else |
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| 304 | return RTEMS_INVALID_NUMBER ; |
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| 305 | |
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| 306 | return RTEMS_SUCCESSFUL ; |
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| 307 | } |
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| 308 | |
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| 309 | /* |
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| 310 | * read bytes from the serial port. We only have stdin. |
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| 311 | */ |
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| 312 | |
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| 313 | rtems_device_driver sh_sci_read( |
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| 314 | rtems_device_major_number major, |
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| 315 | rtems_device_minor_number minor, |
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| 316 | void * arg |
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| 317 | ) |
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| 318 | { |
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| 319 | rtems_libio_rw_args_t *rw_args; |
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| 320 | char *buffer; |
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| 321 | int maximum; |
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| 322 | int count = 0; |
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| 323 | |
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| 324 | rw_args = (rtems_libio_rw_args_t *) arg; |
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| 325 | |
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| 326 | buffer = rw_args->buffer; |
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| 327 | maximum = rw_args->count; |
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| 328 | |
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| 329 | for (count = 0; count < maximum; count++) { |
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| 330 | buffer[ count ] = inbyte(minor); |
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| 331 | if (buffer[ count ] == '\n' || buffer[ count ] == '\r') { |
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| 332 | buffer[ count++ ] = '\n'; |
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| 333 | break; |
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| 334 | } |
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| 335 | } |
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| 336 | |
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| 337 | rw_args->bytes_moved = count; |
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| 338 | return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED; |
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| 339 | } |
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| 340 | |
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| 341 | /* |
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| 342 | * write bytes to the serial port. Stdout and stderr are the same. |
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| 343 | */ |
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| 344 | |
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| 345 | rtems_device_driver sh_sci_write( |
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| 346 | rtems_device_major_number major, |
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| 347 | rtems_device_minor_number minor, |
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| 348 | void * arg |
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| 349 | ) |
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| 350 | { |
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| 351 | int count; |
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| 352 | int maximum; |
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| 353 | rtems_libio_rw_args_t *rw_args; |
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| 354 | char *buffer; |
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| 355 | |
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| 356 | rw_args = (rtems_libio_rw_args_t *) arg; |
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| 357 | |
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| 358 | buffer = rw_args->buffer; |
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| 359 | maximum = rw_args->count; |
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| 360 | |
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| 361 | for (count = 0; count < maximum; count++) { |
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| 362 | if ( buffer[ count ] == '\n') { |
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| 363 | outbyte(minor, '\r'); |
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| 364 | } |
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| 365 | outbyte( minor, buffer[ count ] ); |
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| 366 | } |
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| 367 | |
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| 368 | rw_args->bytes_moved = maximum; |
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| 369 | return 0; |
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| 370 | } |
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| 371 | |
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| 372 | /* |
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| 373 | * IO Control entry point |
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| 374 | */ |
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| 375 | |
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| 376 | rtems_device_driver sh_sci_control( |
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| 377 | rtems_device_major_number major, |
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| 378 | rtems_device_minor_number minor, |
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| 379 | void * arg |
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| 380 | ) |
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| 381 | { |
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| 382 | /* Not yet supported */ |
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| 383 | return RTEMS_SUCCESSFUL ; |
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| 384 | } |
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