root / hw / sh_serial.c @ a245f2e7
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1 | 2f062c72 | ths | /*
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2 | 2f062c72 | ths | * QEMU SCI/SCIF serial port emulation
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3 | 2f062c72 | ths | *
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4 | 2f062c72 | ths | * Copyright (c) 2007 Magnus Damm
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5 | 2f062c72 | ths | *
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6 | 2f062c72 | ths | * Based on serial.c - QEMU 16450 UART emulation
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7 | 2f062c72 | ths | * Copyright (c) 2003-2004 Fabrice Bellard
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8 | 2f062c72 | ths | *
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9 | 2f062c72 | ths | * Permission is hereby granted, free of charge, to any person obtaining a copy
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10 | 2f062c72 | ths | * of this software and associated documentation files (the "Software"), to deal
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11 | 2f062c72 | ths | * in the Software without restriction, including without limitation the rights
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12 | 2f062c72 | ths | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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13 | 2f062c72 | ths | * copies of the Software, and to permit persons to whom the Software is
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14 | 2f062c72 | ths | * furnished to do so, subject to the following conditions:
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15 | 2f062c72 | ths | *
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16 | 2f062c72 | ths | * The above copyright notice and this permission notice shall be included in
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17 | 2f062c72 | ths | * all copies or substantial portions of the Software.
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18 | 2f062c72 | ths | *
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19 | 2f062c72 | ths | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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20 | 2f062c72 | ths | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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21 | 2f062c72 | ths | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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22 | 2f062c72 | ths | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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23 | 2f062c72 | ths | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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24 | 2f062c72 | ths | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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25 | 2f062c72 | ths | * THE SOFTWARE.
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26 | 2f062c72 | ths | */
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27 | 87ecb68b | pbrook | #include "hw.h" |
28 | 87ecb68b | pbrook | #include "sh.h" |
29 | 87ecb68b | pbrook | #include "qemu-char.h" |
30 | 2f062c72 | ths | #include <assert.h> |
31 | 2f062c72 | ths | |
32 | 2f062c72 | ths | //#define DEBUG_SERIAL
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33 | 2f062c72 | ths | |
34 | 2f062c72 | ths | #define SH_SERIAL_FLAG_TEND (1 << 0) |
35 | 2f062c72 | ths | #define SH_SERIAL_FLAG_TDE (1 << 1) |
36 | 2f062c72 | ths | #define SH_SERIAL_FLAG_RDF (1 << 2) |
37 | 2f062c72 | ths | #define SH_SERIAL_FLAG_BRK (1 << 3) |
38 | 2f062c72 | ths | #define SH_SERIAL_FLAG_DR (1 << 4) |
39 | 2f062c72 | ths | |
40 | 2f062c72 | ths | typedef struct { |
41 | 2f062c72 | ths | uint8_t smr; |
42 | 2f062c72 | ths | uint8_t brr; |
43 | 2f062c72 | ths | uint8_t scr; |
44 | 2f062c72 | ths | uint8_t dr; /* ftdr / tdr */
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45 | 2f062c72 | ths | uint8_t sr; /* fsr / ssr */
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46 | 2f062c72 | ths | uint16_t fcr; |
47 | 2f062c72 | ths | uint8_t sptr; |
48 | 2f062c72 | ths | |
49 | 2f062c72 | ths | uint8_t rx_fifo[16]; /* frdr / rdr */ |
50 | 2f062c72 | ths | uint8_t rx_cnt; |
51 | 2f062c72 | ths | |
52 | 2f062c72 | ths | target_phys_addr_t base; |
53 | 2f062c72 | ths | int freq;
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54 | 2f062c72 | ths | int feat;
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55 | 2f062c72 | ths | int flags;
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56 | 2f062c72 | ths | |
57 | 2f062c72 | ths | CharDriverState *chr; |
58 | bf5b7423 | aurel32 | |
59 | bf5b7423 | aurel32 | struct intc_source *eri;
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60 | bf5b7423 | aurel32 | struct intc_source *rxi;
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61 | bf5b7423 | aurel32 | struct intc_source *txi;
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62 | bf5b7423 | aurel32 | struct intc_source *tei;
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63 | bf5b7423 | aurel32 | struct intc_source *bri;
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64 | 2f062c72 | ths | } sh_serial_state; |
65 | 2f062c72 | ths | |
66 | 2f062c72 | ths | static void sh_serial_ioport_write(void *opaque, uint32_t offs, uint32_t val) |
67 | 2f062c72 | ths | { |
68 | 2f062c72 | ths | sh_serial_state *s = opaque; |
69 | 2f062c72 | ths | unsigned char ch; |
70 | 2f062c72 | ths | |
71 | 2f062c72 | ths | #ifdef DEBUG_SERIAL
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72 | 2f062c72 | ths | printf("sh_serial: write base=0x%08lx offs=0x%02x val=0x%02x\n",
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73 | 2f062c72 | ths | (unsigned long) s->base, offs, val); |
74 | 2f062c72 | ths | #endif
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75 | 2f062c72 | ths | switch(offs) {
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76 | 2f062c72 | ths | case 0x00: /* SMR */ |
77 | 2f062c72 | ths | s->smr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0x7b : 0xff); |
78 | 2f062c72 | ths | return;
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79 | 2f062c72 | ths | case 0x04: /* BRR */ |
80 | 2f062c72 | ths | s->brr = val; |
81 | 2f062c72 | ths | return;
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82 | 2f062c72 | ths | case 0x08: /* SCR */ |
83 | bf5b7423 | aurel32 | s->scr = val & ((s->feat & SH_SERIAL_FEAT_SCIF) ? 0xfa : 0xff); |
84 | 2f062c72 | ths | if (!(val & (1 << 5))) |
85 | 2f062c72 | ths | s->flags |= SH_SERIAL_FLAG_TEND; |
86 | bf5b7423 | aurel32 | if ((s->feat & SH_SERIAL_FEAT_SCIF) && s->txi) {
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87 | bf5b7423 | aurel32 | if ((val & (1 << 7)) && !(s->txi->asserted)) |
88 | bf5b7423 | aurel32 | sh_intc_toggle_source(s->txi, 0, 1); |
89 | bf5b7423 | aurel32 | else if (!(val & (1 << 7)) && s->txi->asserted) |
90 | bf5b7423 | aurel32 | sh_intc_toggle_source(s->txi, 0, -1); |
91 | bf5b7423 | aurel32 | } |
92 | 2f062c72 | ths | return;
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93 | 2f062c72 | ths | case 0x0c: /* FTDR / TDR */ |
94 | 2f062c72 | ths | if (s->chr) {
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95 | 2f062c72 | ths | ch = val; |
96 | 2f062c72 | ths | qemu_chr_write(s->chr, &ch, 1);
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97 | 2f062c72 | ths | } |
98 | 2f062c72 | ths | s->dr = val; |
99 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_TDE; |
100 | 2f062c72 | ths | return;
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101 | 2f062c72 | ths | #if 0
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102 | 2f062c72 | ths | case 0x14: /* FRDR / RDR */
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103 | 2f062c72 | ths | ret = 0;
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104 | 2f062c72 | ths | break;
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105 | 2f062c72 | ths | #endif
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106 | 2f062c72 | ths | } |
107 | 2f062c72 | ths | if (s->feat & SH_SERIAL_FEAT_SCIF) {
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108 | 2f062c72 | ths | switch(offs) {
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109 | 2f062c72 | ths | case 0x10: /* FSR */ |
110 | 2f062c72 | ths | if (!(val & (1 << 6))) |
111 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_TEND; |
112 | 2f062c72 | ths | if (!(val & (1 << 5))) |
113 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_TDE; |
114 | 2f062c72 | ths | if (!(val & (1 << 4))) |
115 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_BRK; |
116 | 2f062c72 | ths | if (!(val & (1 << 1))) |
117 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_RDF; |
118 | 2f062c72 | ths | if (!(val & (1 << 0))) |
119 | 2f062c72 | ths | s->flags &= ~SH_SERIAL_FLAG_DR; |
120 | 2f062c72 | ths | return;
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121 | 2f062c72 | ths | case 0x18: /* FCR */ |
122 | 2f062c72 | ths | s->fcr = val; |
123 | 2f062c72 | ths | return;
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124 | 2f062c72 | ths | case 0x20: /* SPTR */ |
125 | 2f062c72 | ths | s->sptr = val; |
126 | 2f062c72 | ths | return;
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127 | 2f062c72 | ths | case 0x24: /* LSR */ |
128 | 2f062c72 | ths | return;
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129 | 2f062c72 | ths | } |
130 | 2f062c72 | ths | } |
131 | 2f062c72 | ths | else {
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132 | 2f062c72 | ths | #if 0
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133 | 2f062c72 | ths | switch(offs) {
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134 | 2f062c72 | ths | case 0x0c:
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135 | 2f062c72 | ths | ret = s->dr;
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136 | 2f062c72 | ths | break;
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137 | 2f062c72 | ths | case 0x10:
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138 | 2f062c72 | ths | ret = 0;
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139 | 2f062c72 | ths | break;
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140 | 2f062c72 | ths | case 0x1c:
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141 | 2f062c72 | ths | ret = s->sptr;
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142 | 2f062c72 | ths | break;
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143 | 2f062c72 | ths | }
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144 | 2f062c72 | ths | #endif
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145 | 2f062c72 | ths | } |
146 | 2f062c72 | ths | |
147 | 2f062c72 | ths | fprintf(stderr, "sh_serial: unsupported write to 0x%02x\n", offs);
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148 | 2f062c72 | ths | assert(0);
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149 | 2f062c72 | ths | } |
150 | 2f062c72 | ths | |
151 | 2f062c72 | ths | static uint32_t sh_serial_ioport_read(void *opaque, uint32_t offs) |
152 | 2f062c72 | ths | { |
153 | 2f062c72 | ths | sh_serial_state *s = opaque; |
154 | 2f062c72 | ths | uint32_t ret = ~0;
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155 | 2f062c72 | ths | |
156 | 2f062c72 | ths | #if 0
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157 | 2f062c72 | ths | switch(offs) {
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158 | 2f062c72 | ths | case 0x00:
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159 | 2f062c72 | ths | ret = s->smr;
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160 | 2f062c72 | ths | break;
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161 | 2f062c72 | ths | case 0x04:
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162 | 2f062c72 | ths | ret = s->brr;
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163 | 2f062c72 | ths | break;
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164 | 2f062c72 | ths | case 0x08:
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165 | 2f062c72 | ths | ret = s->scr;
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166 | 2f062c72 | ths | break;
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167 | 2f062c72 | ths | case 0x14:
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168 | 2f062c72 | ths | ret = 0;
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169 | 2f062c72 | ths | break;
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170 | 2f062c72 | ths | }
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171 | 2f062c72 | ths | #endif
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172 | 2f062c72 | ths | if (s->feat & SH_SERIAL_FEAT_SCIF) {
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173 | 2f062c72 | ths | switch(offs) {
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174 | bf5b7423 | aurel32 | case 0x00: /* SMR */ |
175 | bf5b7423 | aurel32 | ret = s->smr; |
176 | bf5b7423 | aurel32 | break;
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177 | bf5b7423 | aurel32 | case 0x08: /* SCR */ |
178 | bf5b7423 | aurel32 | ret = s->scr; |
179 | bf5b7423 | aurel32 | break;
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180 | 2f062c72 | ths | case 0x10: /* FSR */ |
181 | 2f062c72 | ths | ret = 0;
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182 | 2f062c72 | ths | if (s->flags & SH_SERIAL_FLAG_TEND)
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183 | 2f062c72 | ths | ret |= (1 << 6); |
184 | 2f062c72 | ths | if (s->flags & SH_SERIAL_FLAG_TDE)
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185 | 2f062c72 | ths | ret |= (1 << 5); |
186 | 2f062c72 | ths | if (s->flags & SH_SERIAL_FLAG_BRK)
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187 | 2f062c72 | ths | ret |= (1 << 4); |
188 | 2f062c72 | ths | if (s->flags & SH_SERIAL_FLAG_RDF)
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189 | 2f062c72 | ths | ret |= (1 << 1); |
190 | 2f062c72 | ths | if (s->flags & SH_SERIAL_FLAG_DR)
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191 | 2f062c72 | ths | ret |= (1 << 0); |
192 | 2f062c72 | ths | |
193 | 2f062c72 | ths | if (s->scr & (1 << 5)) |
194 | 2f062c72 | ths | s->flags |= SH_SERIAL_FLAG_TDE | SH_SERIAL_FLAG_TEND; |
195 | 2f062c72 | ths | |
196 | 2f062c72 | ths | break;
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197 | 2f062c72 | ths | #if 0
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198 | 2f062c72 | ths | case 0x18:
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199 | 2f062c72 | ths | ret = s->fcr;
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200 | 2f062c72 | ths | break;
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201 | 2f062c72 | ths | #endif
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202 | 2f062c72 | ths | case 0x1c: |
203 | 2f062c72 | ths | ret = s->rx_cnt; |
204 | 2f062c72 | ths | break;
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205 | 2f062c72 | ths | case 0x20: |
206 | 2f062c72 | ths | ret = s->sptr; |
207 | 2f062c72 | ths | break;
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208 | 2f062c72 | ths | case 0x24: |
209 | 2f062c72 | ths | ret = 0;
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210 | 2f062c72 | ths | break;
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211 | 2f062c72 | ths | } |
212 | 2f062c72 | ths | } |
213 | 2f062c72 | ths | else {
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214 | 2f062c72 | ths | #if 0
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215 | 2f062c72 | ths | switch(offs) {
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216 | 2f062c72 | ths | case 0x0c:
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217 | 2f062c72 | ths | ret = s->dr;
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218 | 2f062c72 | ths | break;
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219 | 2f062c72 | ths | case 0x10:
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220 | 2f062c72 | ths | ret = 0;
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221 | 2f062c72 | ths | break;
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222 | 2f062c72 | ths | case 0x1c:
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223 | 2f062c72 | ths | ret = s->sptr;
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224 | 2f062c72 | ths | break;
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225 | 2f062c72 | ths | }
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226 | 2f062c72 | ths | #endif
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227 | 2f062c72 | ths | } |
228 | 2f062c72 | ths | #ifdef DEBUG_SERIAL
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229 | 2f062c72 | ths | printf("sh_serial: read base=0x%08lx offs=0x%02x val=0x%x\n",
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230 | 2f062c72 | ths | (unsigned long) s->base, offs, ret); |
231 | 2f062c72 | ths | #endif
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232 | 2f062c72 | ths | |
233 | 2f062c72 | ths | if (ret & ~((1 << 16) - 1)) { |
234 | 2f062c72 | ths | fprintf(stderr, "sh_serial: unsupported read from 0x%02x\n", offs);
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235 | 2f062c72 | ths | assert(0);
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236 | 2f062c72 | ths | } |
237 | 2f062c72 | ths | |
238 | 2f062c72 | ths | return ret;
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239 | 2f062c72 | ths | } |
240 | 2f062c72 | ths | |
241 | 2f062c72 | ths | static int sh_serial_can_receive(sh_serial_state *s) |
242 | 2f062c72 | ths | { |
243 | 2f062c72 | ths | return 0; |
244 | 2f062c72 | ths | } |
245 | 2f062c72 | ths | |
246 | 2f062c72 | ths | static void sh_serial_receive_byte(sh_serial_state *s, int ch) |
247 | 2f062c72 | ths | { |
248 | 2f062c72 | ths | } |
249 | 2f062c72 | ths | |
250 | 2f062c72 | ths | static void sh_serial_receive_break(sh_serial_state *s) |
251 | 2f062c72 | ths | { |
252 | 2f062c72 | ths | } |
253 | 2f062c72 | ths | |
254 | 2f062c72 | ths | static int sh_serial_can_receive1(void *opaque) |
255 | 2f062c72 | ths | { |
256 | 2f062c72 | ths | sh_serial_state *s = opaque; |
257 | 2f062c72 | ths | return sh_serial_can_receive(s);
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258 | 2f062c72 | ths | } |
259 | 2f062c72 | ths | |
260 | 2f062c72 | ths | static void sh_serial_receive1(void *opaque, const uint8_t *buf, int size) |
261 | 2f062c72 | ths | { |
262 | 2f062c72 | ths | sh_serial_state *s = opaque; |
263 | 2f062c72 | ths | sh_serial_receive_byte(s, buf[0]);
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264 | 2f062c72 | ths | } |
265 | 2f062c72 | ths | |
266 | 2f062c72 | ths | static void sh_serial_event(void *opaque, int event) |
267 | 2f062c72 | ths | { |
268 | 2f062c72 | ths | sh_serial_state *s = opaque; |
269 | 2f062c72 | ths | if (event == CHR_EVENT_BREAK)
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270 | 2f062c72 | ths | sh_serial_receive_break(s); |
271 | 2f062c72 | ths | } |
272 | 2f062c72 | ths | |
273 | 9596ebb7 | pbrook | static uint32_t sh_serial_read (void *opaque, target_phys_addr_t addr) |
274 | 2f062c72 | ths | { |
275 | 2f062c72 | ths | sh_serial_state *s = opaque; |
276 | 2f062c72 | ths | return sh_serial_ioport_read(s, addr - s->base);
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277 | 2f062c72 | ths | } |
278 | 2f062c72 | ths | |
279 | 9596ebb7 | pbrook | static void sh_serial_write (void *opaque, |
280 | 9596ebb7 | pbrook | target_phys_addr_t addr, uint32_t value) |
281 | 2f062c72 | ths | { |
282 | 2f062c72 | ths | sh_serial_state *s = opaque; |
283 | 2f062c72 | ths | sh_serial_ioport_write(s, addr - s->base, value); |
284 | 2f062c72 | ths | } |
285 | 2f062c72 | ths | |
286 | 2f062c72 | ths | static CPUReadMemoryFunc *sh_serial_readfn[] = {
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287 | 2f062c72 | ths | &sh_serial_read, |
288 | 2f062c72 | ths | &sh_serial_read, |
289 | 2f062c72 | ths | &sh_serial_read, |
290 | 2f062c72 | ths | }; |
291 | 2f062c72 | ths | |
292 | 2f062c72 | ths | static CPUWriteMemoryFunc *sh_serial_writefn[] = {
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293 | 2f062c72 | ths | &sh_serial_write, |
294 | 2f062c72 | ths | &sh_serial_write, |
295 | 2f062c72 | ths | &sh_serial_write, |
296 | 2f062c72 | ths | }; |
297 | 2f062c72 | ths | |
298 | 2f062c72 | ths | void sh_serial_init (target_phys_addr_t base, int feat, |
299 | bf5b7423 | aurel32 | uint32_t freq, CharDriverState *chr, |
300 | bf5b7423 | aurel32 | struct intc_source *eri_source,
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301 | bf5b7423 | aurel32 | struct intc_source *rxi_source,
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302 | bf5b7423 | aurel32 | struct intc_source *txi_source,
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303 | bf5b7423 | aurel32 | struct intc_source *tei_source,
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304 | bf5b7423 | aurel32 | struct intc_source *bri_source)
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305 | 2f062c72 | ths | { |
306 | 2f062c72 | ths | sh_serial_state *s; |
307 | 2f062c72 | ths | int s_io_memory;
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308 | 2f062c72 | ths | |
309 | 2f062c72 | ths | s = qemu_mallocz(sizeof(sh_serial_state));
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310 | 2f062c72 | ths | if (!s)
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311 | 2f062c72 | ths | return;
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312 | 2f062c72 | ths | |
313 | 2f062c72 | ths | s->base = base; |
314 | 2f062c72 | ths | s->feat = feat; |
315 | 2f062c72 | ths | s->flags = SH_SERIAL_FLAG_TEND | SH_SERIAL_FLAG_TDE; |
316 | 2f062c72 | ths | |
317 | 2f062c72 | ths | s->smr = 0;
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318 | 2f062c72 | ths | s->brr = 0xff;
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319 | b7d35e65 | balrog | s->scr = 1 << 5; /* pretend that TX is enabled so early printk works */ |
320 | 2f062c72 | ths | s->sptr = 0;
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321 | 2f062c72 | ths | |
322 | 2f062c72 | ths | if (feat & SH_SERIAL_FEAT_SCIF) {
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323 | 2f062c72 | ths | s->fcr = 0;
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324 | 2f062c72 | ths | } |
325 | 2f062c72 | ths | else {
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326 | 2f062c72 | ths | s->dr = 0xff;
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327 | 2f062c72 | ths | } |
328 | 2f062c72 | ths | |
329 | 2f062c72 | ths | s->rx_cnt = 0;
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330 | 2f062c72 | ths | |
331 | 2f062c72 | ths | s_io_memory = cpu_register_io_memory(0, sh_serial_readfn,
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332 | 2f062c72 | ths | sh_serial_writefn, s); |
333 | 2f062c72 | ths | cpu_register_physical_memory(base, 0x28, s_io_memory);
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334 | 2f062c72 | ths | |
335 | 2f062c72 | ths | s->chr = chr; |
336 | 2f062c72 | ths | |
337 | 2f062c72 | ths | if (chr)
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338 | 2f062c72 | ths | qemu_chr_add_handlers(chr, sh_serial_can_receive1, sh_serial_receive1, |
339 | 2f062c72 | ths | sh_serial_event, s); |
340 | bf5b7423 | aurel32 | |
341 | bf5b7423 | aurel32 | s->eri = eri_source; |
342 | bf5b7423 | aurel32 | s->rxi = rxi_source; |
343 | bf5b7423 | aurel32 | s->txi = txi_source; |
344 | bf5b7423 | aurel32 | s->tei = tei_source; |
345 | bf5b7423 | aurel32 | s->bri = bri_source; |
346 | 2f062c72 | ths | } |