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1 | 27503323 | bellard | /*
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2 | 27503323 | bellard | * QEMU DMA emulation
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3 | 85571bc7 | bellard | *
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4 | 85571bc7 | bellard | * Copyright (c) 2003-2004 Vassili Karpov (malc)
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5 | 85571bc7 | bellard | *
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6 | 27503323 | bellard | * Permission is hereby granted, free of charge, to any person obtaining a copy
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7 | 27503323 | bellard | * of this software and associated documentation files (the "Software"), to deal
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8 | 27503323 | bellard | * in the Software without restriction, including without limitation the rights
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9 | 27503323 | bellard | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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10 | 27503323 | bellard | * copies of the Software, and to permit persons to whom the Software is
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11 | 27503323 | bellard | * furnished to do so, subject to the following conditions:
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12 | 27503323 | bellard | *
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13 | 27503323 | bellard | * The above copyright notice and this permission notice shall be included in
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14 | 27503323 | bellard | * all copies or substantial portions of the Software.
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15 | 27503323 | bellard | *
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16 | 27503323 | bellard | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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17 | 27503323 | bellard | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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18 | 27503323 | bellard | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 | 27503323 | bellard | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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20 | 27503323 | bellard | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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21 | 27503323 | bellard | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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22 | 27503323 | bellard | * THE SOFTWARE.
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23 | 27503323 | bellard | */
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24 | 87ecb68b | pbrook | #include "hw.h" |
25 | 87ecb68b | pbrook | #include "isa.h" |
26 | 27503323 | bellard | |
27 | 85571bc7 | bellard | /* #define DEBUG_DMA */
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28 | 7ebb5e41 | bellard | |
29 | 85571bc7 | bellard | #define dolog(...) fprintf (stderr, "dma: " __VA_ARGS__) |
30 | 27503323 | bellard | #ifdef DEBUG_DMA
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31 | 27503323 | bellard | #define linfo(...) fprintf (stderr, "dma: " __VA_ARGS__) |
32 | 27503323 | bellard | #define ldebug(...) fprintf (stderr, "dma: " __VA_ARGS__) |
33 | 27503323 | bellard | #else
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34 | 27503323 | bellard | #define linfo(...)
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35 | 27503323 | bellard | #define ldebug(...)
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36 | 27503323 | bellard | #endif
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37 | 27503323 | bellard | |
38 | 27503323 | bellard | struct dma_regs {
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39 | 27503323 | bellard | int now[2]; |
40 | 27503323 | bellard | uint16_t base[2];
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41 | 27503323 | bellard | uint8_t mode; |
42 | 27503323 | bellard | uint8_t page; |
43 | b0bda528 | bellard | uint8_t pageh; |
44 | 27503323 | bellard | uint8_t dack; |
45 | 27503323 | bellard | uint8_t eop; |
46 | 16f62432 | bellard | DMA_transfer_handler transfer_handler; |
47 | 16f62432 | bellard | void *opaque;
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48 | 27503323 | bellard | }; |
49 | 27503323 | bellard | |
50 | 27503323 | bellard | #define ADDR 0 |
51 | 27503323 | bellard | #define COUNT 1 |
52 | 27503323 | bellard | |
53 | 27503323 | bellard | static struct dma_cont { |
54 | 27503323 | bellard | uint8_t status; |
55 | 27503323 | bellard | uint8_t command; |
56 | 27503323 | bellard | uint8_t mask; |
57 | 27503323 | bellard | uint8_t flip_flop; |
58 | 9eb153f1 | bellard | int dshift;
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59 | 27503323 | bellard | struct dma_regs regs[4]; |
60 | 4556bd8b | Blue Swirl | qemu_irq *cpu_request_exit; |
61 | 58229933 | Julien Grall | MemoryRegion channel_io; |
62 | 58229933 | Julien Grall | MemoryRegion cont_io; |
63 | 27503323 | bellard | } dma_controllers[2];
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64 | 27503323 | bellard | |
65 | 27503323 | bellard | enum {
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66 | e875c40a | bellard | CMD_MEMORY_TO_MEMORY = 0x01,
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67 | e875c40a | bellard | CMD_FIXED_ADDRESS = 0x02,
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68 | e875c40a | bellard | CMD_BLOCK_CONTROLLER = 0x04,
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69 | e875c40a | bellard | CMD_COMPRESSED_TIME = 0x08,
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70 | e875c40a | bellard | CMD_CYCLIC_PRIORITY = 0x10,
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71 | e875c40a | bellard | CMD_EXTENDED_WRITE = 0x20,
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72 | e875c40a | bellard | CMD_LOW_DREQ = 0x40,
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73 | e875c40a | bellard | CMD_LOW_DACK = 0x80,
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74 | e875c40a | bellard | CMD_NOT_SUPPORTED = CMD_MEMORY_TO_MEMORY | CMD_FIXED_ADDRESS |
75 | e875c40a | bellard | | CMD_COMPRESSED_TIME | CMD_CYCLIC_PRIORITY | CMD_EXTENDED_WRITE |
76 | e875c40a | bellard | | CMD_LOW_DREQ | CMD_LOW_DACK |
77 | 27503323 | bellard | |
78 | 27503323 | bellard | }; |
79 | 27503323 | bellard | |
80 | 492c30af | aliguori | static void DMA_run (void); |
81 | 492c30af | aliguori | |
82 | 9eb153f1 | bellard | static int channels[8] = {-1, 2, 3, 1, -1, -1, -1, 0}; |
83 | 9eb153f1 | bellard | |
84 | 7d977de7 | bellard | static void write_page (void *opaque, uint32_t nport, uint32_t data) |
85 | 27503323 | bellard | { |
86 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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87 | 27503323 | bellard | int ichan;
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88 | 27503323 | bellard | |
89 | 9eb153f1 | bellard | ichan = channels[nport & 7];
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90 | 27503323 | bellard | if (-1 == ichan) { |
91 | 85571bc7 | bellard | dolog ("invalid channel %#x %#x\n", nport, data);
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92 | 27503323 | bellard | return;
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93 | 27503323 | bellard | } |
94 | 9eb153f1 | bellard | d->regs[ichan].page = data; |
95 | 9eb153f1 | bellard | } |
96 | 9eb153f1 | bellard | |
97 | b0bda528 | bellard | static void write_pageh (void *opaque, uint32_t nport, uint32_t data) |
98 | 9eb153f1 | bellard | { |
99 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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100 | 9eb153f1 | bellard | int ichan;
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101 | 27503323 | bellard | |
102 | 9eb153f1 | bellard | ichan = channels[nport & 7];
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103 | b0bda528 | bellard | if (-1 == ichan) { |
104 | 85571bc7 | bellard | dolog ("invalid channel %#x %#x\n", nport, data);
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105 | b0bda528 | bellard | return;
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106 | b0bda528 | bellard | } |
107 | b0bda528 | bellard | d->regs[ichan].pageh = data; |
108 | b0bda528 | bellard | } |
109 | 9eb153f1 | bellard | |
110 | b0bda528 | bellard | static uint32_t read_page (void *opaque, uint32_t nport) |
111 | b0bda528 | bellard | { |
112 | b0bda528 | bellard | struct dma_cont *d = opaque;
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113 | b0bda528 | bellard | int ichan;
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114 | b0bda528 | bellard | |
115 | b0bda528 | bellard | ichan = channels[nport & 7];
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116 | 9eb153f1 | bellard | if (-1 == ichan) { |
117 | 85571bc7 | bellard | dolog ("invalid channel read %#x\n", nport);
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118 | 9eb153f1 | bellard | return 0; |
119 | 9eb153f1 | bellard | } |
120 | 9eb153f1 | bellard | return d->regs[ichan].page;
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121 | 27503323 | bellard | } |
122 | 27503323 | bellard | |
123 | b0bda528 | bellard | static uint32_t read_pageh (void *opaque, uint32_t nport) |
124 | b0bda528 | bellard | { |
125 | b0bda528 | bellard | struct dma_cont *d = opaque;
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126 | b0bda528 | bellard | int ichan;
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127 | b0bda528 | bellard | |
128 | b0bda528 | bellard | ichan = channels[nport & 7];
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129 | b0bda528 | bellard | if (-1 == ichan) { |
130 | 85571bc7 | bellard | dolog ("invalid channel read %#x\n", nport);
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131 | b0bda528 | bellard | return 0; |
132 | b0bda528 | bellard | } |
133 | b0bda528 | bellard | return d->regs[ichan].pageh;
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134 | b0bda528 | bellard | } |
135 | b0bda528 | bellard | |
136 | 9eb153f1 | bellard | static inline void init_chan (struct dma_cont *d, int ichan) |
137 | 27503323 | bellard | { |
138 | 27503323 | bellard | struct dma_regs *r;
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139 | 27503323 | bellard | |
140 | 9eb153f1 | bellard | r = d->regs + ichan; |
141 | 85571bc7 | bellard | r->now[ADDR] = r->base[ADDR] << d->dshift; |
142 | 27503323 | bellard | r->now[COUNT] = 0;
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143 | 27503323 | bellard | } |
144 | 27503323 | bellard | |
145 | 9eb153f1 | bellard | static inline int getff (struct dma_cont *d) |
146 | 27503323 | bellard | { |
147 | 27503323 | bellard | int ff;
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148 | 27503323 | bellard | |
149 | 9eb153f1 | bellard | ff = d->flip_flop; |
150 | 9eb153f1 | bellard | d->flip_flop = !ff; |
151 | 27503323 | bellard | return ff;
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152 | 27503323 | bellard | } |
153 | 27503323 | bellard | |
154 | 58229933 | Julien Grall | static uint64_t read_chan(void *opaque, hwaddr nport, unsigned size) |
155 | 27503323 | bellard | { |
156 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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157 | 85571bc7 | bellard | int ichan, nreg, iport, ff, val, dir;
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158 | 27503323 | bellard | struct dma_regs *r;
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159 | 27503323 | bellard | |
160 | 9eb153f1 | bellard | iport = (nport >> d->dshift) & 0x0f;
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161 | 9eb153f1 | bellard | ichan = iport >> 1;
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162 | 9eb153f1 | bellard | nreg = iport & 1;
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163 | 9eb153f1 | bellard | r = d->regs + ichan; |
164 | 27503323 | bellard | |
165 | 85571bc7 | bellard | dir = ((r->mode >> 5) & 1) ? -1 : 1; |
166 | 9eb153f1 | bellard | ff = getff (d); |
167 | 27503323 | bellard | if (nreg)
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168 | 9eb153f1 | bellard | val = (r->base[COUNT] << d->dshift) - r->now[COUNT]; |
169 | 27503323 | bellard | else
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170 | 85571bc7 | bellard | val = r->now[ADDR] + r->now[COUNT] * dir; |
171 | 27503323 | bellard | |
172 | 85571bc7 | bellard | ldebug ("read_chan %#x -> %d\n", iport, val);
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173 | 9eb153f1 | bellard | return (val >> (d->dshift + (ff << 3))) & 0xff; |
174 | 27503323 | bellard | } |
175 | 27503323 | bellard | |
176 | 58229933 | Julien Grall | static void write_chan(void *opaque, hwaddr nport, uint64_t data, |
177 | 58229933 | Julien Grall | unsigned size)
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178 | 27503323 | bellard | { |
179 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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180 | 9eb153f1 | bellard | int iport, ichan, nreg;
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181 | 27503323 | bellard | struct dma_regs *r;
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182 | 27503323 | bellard | |
183 | 9eb153f1 | bellard | iport = (nport >> d->dshift) & 0x0f;
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184 | 9eb153f1 | bellard | ichan = iport >> 1;
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185 | 9eb153f1 | bellard | nreg = iport & 1;
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186 | 9eb153f1 | bellard | r = d->regs + ichan; |
187 | 9eb153f1 | bellard | if (getff (d)) {
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188 | 3504fe17 | bellard | r->base[nreg] = (r->base[nreg] & 0xff) | ((data << 8) & 0xff00); |
189 | 9eb153f1 | bellard | init_chan (d, ichan); |
190 | 3504fe17 | bellard | } else {
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191 | 3504fe17 | bellard | r->base[nreg] = (r->base[nreg] & 0xff00) | (data & 0xff); |
192 | 27503323 | bellard | } |
193 | 27503323 | bellard | } |
194 | 27503323 | bellard | |
195 | 58229933 | Julien Grall | static void write_cont(void *opaque, hwaddr nport, uint64_t data, |
196 | 58229933 | Julien Grall | unsigned size)
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197 | 27503323 | bellard | { |
198 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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199 | 85571bc7 | bellard | int iport, ichan = 0; |
200 | 27503323 | bellard | |
201 | 9eb153f1 | bellard | iport = (nport >> d->dshift) & 0x0f;
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202 | 27503323 | bellard | switch (iport) {
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203 | 58229933 | Julien Grall | case 0x01: /* command */ |
204 | df475d18 | bellard | if ((data != 0) && (data & CMD_NOT_SUPPORTED)) { |
205 | 58229933 | Julien Grall | dolog("command %"PRIx64" not supported\n", data); |
206 | df475d18 | bellard | return;
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207 | 27503323 | bellard | } |
208 | 27503323 | bellard | d->command = data; |
209 | 27503323 | bellard | break;
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210 | 27503323 | bellard | |
211 | 58229933 | Julien Grall | case 0x02: |
212 | 27503323 | bellard | ichan = data & 3;
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213 | 27503323 | bellard | if (data & 4) { |
214 | 27503323 | bellard | d->status |= 1 << (ichan + 4); |
215 | 27503323 | bellard | } |
216 | 27503323 | bellard | else {
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217 | 27503323 | bellard | d->status &= ~(1 << (ichan + 4)); |
218 | 27503323 | bellard | } |
219 | 27503323 | bellard | d->status &= ~(1 << ichan);
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220 | 492c30af | aliguori | DMA_run(); |
221 | 27503323 | bellard | break;
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222 | 27503323 | bellard | |
223 | 58229933 | Julien Grall | case 0x03: /* single mask */ |
224 | 27503323 | bellard | if (data & 4) |
225 | 27503323 | bellard | d->mask |= 1 << (data & 3); |
226 | 27503323 | bellard | else
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227 | 27503323 | bellard | d->mask &= ~(1 << (data & 3)); |
228 | 492c30af | aliguori | DMA_run(); |
229 | 27503323 | bellard | break;
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230 | 27503323 | bellard | |
231 | 58229933 | Julien Grall | case 0x04: /* mode */ |
232 | 27503323 | bellard | { |
233 | 16d17fdb | bellard | ichan = data & 3;
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234 | 16d17fdb | bellard | #ifdef DEBUG_DMA
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235 | 85571bc7 | bellard | { |
236 | 85571bc7 | bellard | int op, ai, dir, opmode;
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237 | e875c40a | bellard | op = (data >> 2) & 3; |
238 | e875c40a | bellard | ai = (data >> 4) & 1; |
239 | e875c40a | bellard | dir = (data >> 5) & 1; |
240 | e875c40a | bellard | opmode = (data >> 6) & 3; |
241 | 27503323 | bellard | |
242 | e875c40a | bellard | linfo ("ichan %d, op %d, ai %d, dir %d, opmode %d\n",
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243 | e875c40a | bellard | ichan, op, ai, dir, opmode); |
244 | 85571bc7 | bellard | } |
245 | 27503323 | bellard | #endif
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246 | 27503323 | bellard | d->regs[ichan].mode = data; |
247 | 27503323 | bellard | break;
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248 | 27503323 | bellard | } |
249 | 27503323 | bellard | |
250 | 58229933 | Julien Grall | case 0x05: /* clear flip flop */ |
251 | 27503323 | bellard | d->flip_flop = 0;
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252 | 27503323 | bellard | break;
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253 | 27503323 | bellard | |
254 | 58229933 | Julien Grall | case 0x06: /* reset */ |
255 | 27503323 | bellard | d->flip_flop = 0;
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256 | 27503323 | bellard | d->mask = ~0;
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257 | 27503323 | bellard | d->status = 0;
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258 | 27503323 | bellard | d->command = 0;
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259 | 27503323 | bellard | break;
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260 | 27503323 | bellard | |
261 | 58229933 | Julien Grall | case 0x07: /* clear mask for all channels */ |
262 | 27503323 | bellard | d->mask = 0;
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263 | 492c30af | aliguori | DMA_run(); |
264 | 27503323 | bellard | break;
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265 | 27503323 | bellard | |
266 | 58229933 | Julien Grall | case 0x08: /* write mask for all channels */ |
267 | 27503323 | bellard | d->mask = data; |
268 | 492c30af | aliguori | DMA_run(); |
269 | 27503323 | bellard | break;
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270 | 27503323 | bellard | |
271 | 27503323 | bellard | default:
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272 | 85571bc7 | bellard | dolog ("unknown iport %#x\n", iport);
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273 | df475d18 | bellard | break;
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274 | 27503323 | bellard | } |
275 | 27503323 | bellard | |
276 | 16d17fdb | bellard | #ifdef DEBUG_DMA
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277 | 27503323 | bellard | if (0xc != iport) { |
278 | 85571bc7 | bellard | linfo ("write_cont: nport %#06x, ichan % 2d, val %#06x\n",
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279 | 9eb153f1 | bellard | nport, ichan, data); |
280 | 27503323 | bellard | } |
281 | 27503323 | bellard | #endif
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282 | 27503323 | bellard | } |
283 | 27503323 | bellard | |
284 | 58229933 | Julien Grall | static uint64_t read_cont(void *opaque, hwaddr nport, unsigned size) |
285 | 9eb153f1 | bellard | { |
286 | 9eb153f1 | bellard | struct dma_cont *d = opaque;
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287 | 9eb153f1 | bellard | int iport, val;
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288 | 85571bc7 | bellard | |
289 | 9eb153f1 | bellard | iport = (nport >> d->dshift) & 0x0f;
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290 | 9eb153f1 | bellard | switch (iport) {
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291 | 85571bc7 | bellard | case 0x08: /* status */ |
292 | 9eb153f1 | bellard | val = d->status; |
293 | 9eb153f1 | bellard | d->status &= 0xf0;
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294 | 9eb153f1 | bellard | break;
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295 | 85571bc7 | bellard | case 0x0f: /* mask */ |
296 | 9eb153f1 | bellard | val = d->mask; |
297 | 9eb153f1 | bellard | break;
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298 | 9eb153f1 | bellard | default:
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299 | 9eb153f1 | bellard | val = 0;
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300 | 9eb153f1 | bellard | break;
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301 | 9eb153f1 | bellard | } |
302 | 85571bc7 | bellard | |
303 | 85571bc7 | bellard | ldebug ("read_cont: nport %#06x, iport %#04x val %#x\n", nport, iport, val);
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304 | 9eb153f1 | bellard | return val;
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305 | 9eb153f1 | bellard | } |
306 | 9eb153f1 | bellard | |
307 | 27503323 | bellard | int DMA_get_channel_mode (int nchan) |
308 | 27503323 | bellard | { |
309 | 27503323 | bellard | return dma_controllers[nchan > 3].regs[nchan & 3].mode; |
310 | 27503323 | bellard | } |
311 | 27503323 | bellard | |
312 | 27503323 | bellard | void DMA_hold_DREQ (int nchan) |
313 | 27503323 | bellard | { |
314 | 27503323 | bellard | int ncont, ichan;
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315 | 27503323 | bellard | |
316 | 27503323 | bellard | ncont = nchan > 3;
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317 | 27503323 | bellard | ichan = nchan & 3;
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318 | 27503323 | bellard | linfo ("held cont=%d chan=%d\n", ncont, ichan);
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319 | 27503323 | bellard | dma_controllers[ncont].status |= 1 << (ichan + 4); |
320 | 492c30af | aliguori | DMA_run(); |
321 | 27503323 | bellard | } |
322 | 27503323 | bellard | |
323 | 27503323 | bellard | void DMA_release_DREQ (int nchan) |
324 | 27503323 | bellard | { |
325 | 27503323 | bellard | int ncont, ichan;
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326 | 27503323 | bellard | |
327 | 27503323 | bellard | ncont = nchan > 3;
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328 | 27503323 | bellard | ichan = nchan & 3;
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329 | 27503323 | bellard | linfo ("released cont=%d chan=%d\n", ncont, ichan);
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330 | 27503323 | bellard | dma_controllers[ncont].status &= ~(1 << (ichan + 4)); |
331 | 492c30af | aliguori | DMA_run(); |
332 | 27503323 | bellard | } |
333 | 27503323 | bellard | |
334 | 27503323 | bellard | static void channel_run (int ncont, int ichan) |
335 | 27503323 | bellard | { |
336 | 27503323 | bellard | int n;
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337 | 85571bc7 | bellard | struct dma_regs *r = &dma_controllers[ncont].regs[ichan];
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338 | 85571bc7 | bellard | #ifdef DEBUG_DMA
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339 | 85571bc7 | bellard | int dir, opmode;
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340 | 27503323 | bellard | |
341 | 85571bc7 | bellard | dir = (r->mode >> 5) & 1; |
342 | 85571bc7 | bellard | opmode = (r->mode >> 6) & 3; |
343 | 27503323 | bellard | |
344 | 85571bc7 | bellard | if (dir) {
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345 | 85571bc7 | bellard | dolog ("DMA in address decrement mode\n");
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346 | 85571bc7 | bellard | } |
347 | 85571bc7 | bellard | if (opmode != 1) { |
348 | 85571bc7 | bellard | dolog ("DMA not in single mode select %#x\n", opmode);
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349 | 85571bc7 | bellard | } |
350 | 85571bc7 | bellard | #endif
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351 | 27503323 | bellard | |
352 | 85571bc7 | bellard | n = r->transfer_handler (r->opaque, ichan + (ncont << 2),
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353 | 85571bc7 | bellard | r->now[COUNT], (r->base[COUNT] + 1) << ncont);
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354 | 85571bc7 | bellard | r->now[COUNT] = n; |
355 | 85571bc7 | bellard | ldebug ("dma_pos %d size %d\n", n, (r->base[COUNT] + 1) << ncont); |
356 | 27503323 | bellard | } |
357 | 27503323 | bellard | |
358 | 492c30af | aliguori | static QEMUBH *dma_bh;
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359 | 492c30af | aliguori | |
360 | 492c30af | aliguori | static void DMA_run (void) |
361 | 27503323 | bellard | { |
362 | 27503323 | bellard | struct dma_cont *d;
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363 | 27503323 | bellard | int icont, ichan;
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364 | 492c30af | aliguori | int rearm = 0; |
365 | acae6f1c | Kevin Wolf | static int running = 0; |
366 | acae6f1c | Kevin Wolf | |
367 | acae6f1c | Kevin Wolf | if (running) {
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368 | acae6f1c | Kevin Wolf | rearm = 1;
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369 | acae6f1c | Kevin Wolf | goto out;
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370 | acae6f1c | Kevin Wolf | } else {
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371 | acae6f1c | Kevin Wolf | running = 1;
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372 | acae6f1c | Kevin Wolf | } |
373 | 27503323 | bellard | |
374 | 27503323 | bellard | d = dma_controllers; |
375 | 27503323 | bellard | |
376 | 27503323 | bellard | for (icont = 0; icont < 2; icont++, d++) { |
377 | 27503323 | bellard | for (ichan = 0; ichan < 4; ichan++) { |
378 | 27503323 | bellard | int mask;
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379 | 27503323 | bellard | |
380 | 27503323 | bellard | mask = 1 << ichan;
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381 | 27503323 | bellard | |
382 | 492c30af | aliguori | if ((0 == (d->mask & mask)) && (0 != (d->status & (mask << 4)))) { |
383 | 27503323 | bellard | channel_run (icont, ichan); |
384 | 492c30af | aliguori | rearm = 1;
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385 | 492c30af | aliguori | } |
386 | 27503323 | bellard | } |
387 | 27503323 | bellard | } |
388 | 492c30af | aliguori | |
389 | acae6f1c | Kevin Wolf | running = 0;
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390 | acae6f1c | Kevin Wolf | out:
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391 | 492c30af | aliguori | if (rearm)
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392 | 492c30af | aliguori | qemu_bh_schedule_idle(dma_bh); |
393 | 492c30af | aliguori | } |
394 | 492c30af | aliguori | |
395 | 492c30af | aliguori | static void DMA_run_bh(void *unused) |
396 | 492c30af | aliguori | { |
397 | 492c30af | aliguori | DMA_run(); |
398 | 27503323 | bellard | } |
399 | 27503323 | bellard | |
400 | 27503323 | bellard | void DMA_register_channel (int nchan, |
401 | 85571bc7 | bellard | DMA_transfer_handler transfer_handler, |
402 | 16f62432 | bellard | void *opaque)
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403 | 27503323 | bellard | { |
404 | 27503323 | bellard | struct dma_regs *r;
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405 | 27503323 | bellard | int ichan, ncont;
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406 | 27503323 | bellard | |
407 | 27503323 | bellard | ncont = nchan > 3;
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408 | 27503323 | bellard | ichan = nchan & 3;
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409 | 27503323 | bellard | |
410 | 27503323 | bellard | r = dma_controllers[ncont].regs + ichan; |
411 | 16f62432 | bellard | r->transfer_handler = transfer_handler; |
412 | 16f62432 | bellard | r->opaque = opaque; |
413 | 16f62432 | bellard | } |
414 | 16f62432 | bellard | |
415 | 85571bc7 | bellard | int DMA_read_memory (int nchan, void *buf, int pos, int len) |
416 | 85571bc7 | bellard | { |
417 | 85571bc7 | bellard | struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3]; |
418 | a8170e5e | Avi Kivity | hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; |
419 | 85571bc7 | bellard | |
420 | 85571bc7 | bellard | if (r->mode & 0x20) { |
421 | 85571bc7 | bellard | int i;
|
422 | 85571bc7 | bellard | uint8_t *p = buf; |
423 | 85571bc7 | bellard | |
424 | 85571bc7 | bellard | cpu_physical_memory_read (addr - pos - len, buf, len); |
425 | 85571bc7 | bellard | /* What about 16bit transfers? */
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426 | 85571bc7 | bellard | for (i = 0; i < len >> 1; i++) { |
427 | 85571bc7 | bellard | uint8_t b = p[len - i - 1];
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428 | 85571bc7 | bellard | p[i] = b; |
429 | 85571bc7 | bellard | } |
430 | 85571bc7 | bellard | } |
431 | 85571bc7 | bellard | else
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432 | 85571bc7 | bellard | cpu_physical_memory_read (addr + pos, buf, len); |
433 | 85571bc7 | bellard | |
434 | 85571bc7 | bellard | return len;
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435 | 85571bc7 | bellard | } |
436 | 85571bc7 | bellard | |
437 | 85571bc7 | bellard | int DMA_write_memory (int nchan, void *buf, int pos, int len) |
438 | 85571bc7 | bellard | { |
439 | 85571bc7 | bellard | struct dma_regs *r = &dma_controllers[nchan > 3].regs[nchan & 3]; |
440 | a8170e5e | Avi Kivity | hwaddr addr = ((r->pageh & 0x7f) << 24) | (r->page << 16) | r->now[ADDR]; |
441 | 85571bc7 | bellard | |
442 | 85571bc7 | bellard | if (r->mode & 0x20) { |
443 | 85571bc7 | bellard | int i;
|
444 | 85571bc7 | bellard | uint8_t *p = buf; |
445 | 85571bc7 | bellard | |
446 | 85571bc7 | bellard | cpu_physical_memory_write (addr - pos - len, buf, len); |
447 | 85571bc7 | bellard | /* What about 16bit transfers? */
|
448 | 85571bc7 | bellard | for (i = 0; i < len; i++) { |
449 | 85571bc7 | bellard | uint8_t b = p[len - i - 1];
|
450 | 85571bc7 | bellard | p[i] = b; |
451 | 85571bc7 | bellard | } |
452 | 85571bc7 | bellard | } |
453 | 85571bc7 | bellard | else
|
454 | 85571bc7 | bellard | cpu_physical_memory_write (addr + pos, buf, len); |
455 | 85571bc7 | bellard | |
456 | 85571bc7 | bellard | return len;
|
457 | 85571bc7 | bellard | } |
458 | 85571bc7 | bellard | |
459 | 16f62432 | bellard | /* request the emulator to transfer a new DMA memory block ASAP */
|
460 | 16f62432 | bellard | void DMA_schedule(int nchan) |
461 | 16f62432 | bellard | { |
462 | 4556bd8b | Blue Swirl | struct dma_cont *d = &dma_controllers[nchan > 3]; |
463 | 4556bd8b | Blue Swirl | |
464 | 4556bd8b | Blue Swirl | qemu_irq_pulse(*d->cpu_request_exit); |
465 | 27503323 | bellard | } |
466 | 27503323 | bellard | |
467 | d7d02e3c | bellard | static void dma_reset(void *opaque) |
468 | d7d02e3c | bellard | { |
469 | d7d02e3c | bellard | struct dma_cont *d = opaque;
|
470 | 58229933 | Julien Grall | write_cont(d, (0x06 << d->dshift), 0, 1); |
471 | d7d02e3c | bellard | } |
472 | d7d02e3c | bellard | |
473 | ca9cc28c | balrog | static int dma_phony_handler (void *opaque, int nchan, int dma_pos, int dma_len) |
474 | ca9cc28c | balrog | { |
475 | ca9cc28c | balrog | dolog ("unregistered DMA channel used nchan=%d dma_pos=%d dma_len=%d\n",
|
476 | ca9cc28c | balrog | nchan, dma_pos, dma_len); |
477 | ca9cc28c | balrog | return dma_pos;
|
478 | ca9cc28c | balrog | } |
479 | ca9cc28c | balrog | |
480 | 58229933 | Julien Grall | |
481 | 58229933 | Julien Grall | static const MemoryRegionOps channel_io_ops = { |
482 | 58229933 | Julien Grall | .read = read_chan, |
483 | 58229933 | Julien Grall | .write = write_chan, |
484 | 58229933 | Julien Grall | .endianness = DEVICE_NATIVE_ENDIAN, |
485 | 58229933 | Julien Grall | .impl = { |
486 | 58229933 | Julien Grall | .min_access_size = 1,
|
487 | 58229933 | Julien Grall | .max_access_size = 1,
|
488 | 58229933 | Julien Grall | }, |
489 | 58229933 | Julien Grall | }; |
490 | 58229933 | Julien Grall | |
491 | 58229933 | Julien Grall | /* IOport from page_base */
|
492 | 58229933 | Julien Grall | static const MemoryRegionPortio page_portio_list[] = { |
493 | 58229933 | Julien Grall | { 0x01, 3, 1, .write = write_page, .read = read_page, }, |
494 | 58229933 | Julien Grall | { 0x07, 1, 1, .write = write_page, .read = read_page, }, |
495 | 58229933 | Julien Grall | PORTIO_END_OF_LIST(), |
496 | 58229933 | Julien Grall | }; |
497 | 58229933 | Julien Grall | |
498 | 58229933 | Julien Grall | /* IOport from pageh_base */
|
499 | 58229933 | Julien Grall | static const MemoryRegionPortio pageh_portio_list[] = { |
500 | 58229933 | Julien Grall | { 0x01, 3, 1, .write = write_pageh, .read = read_pageh, }, |
501 | 58229933 | Julien Grall | { 0x07, 3, 1, .write = write_pageh, .read = read_pageh, }, |
502 | 58229933 | Julien Grall | PORTIO_END_OF_LIST(), |
503 | 58229933 | Julien Grall | }; |
504 | 58229933 | Julien Grall | |
505 | 58229933 | Julien Grall | static const MemoryRegionOps cont_io_ops = { |
506 | 58229933 | Julien Grall | .read = read_cont, |
507 | 58229933 | Julien Grall | .write = write_cont, |
508 | 58229933 | Julien Grall | .endianness = DEVICE_NATIVE_ENDIAN, |
509 | 58229933 | Julien Grall | .impl = { |
510 | 58229933 | Julien Grall | .min_access_size = 1,
|
511 | 58229933 | Julien Grall | .max_access_size = 1,
|
512 | 58229933 | Julien Grall | }, |
513 | 58229933 | Julien Grall | }; |
514 | 58229933 | Julien Grall | |
515 | 9eb153f1 | bellard | /* dshift = 0: 8 bit DMA, 1 = 16 bit DMA */
|
516 | 85571bc7 | bellard | static void dma_init2(struct dma_cont *d, int base, int dshift, |
517 | 4556bd8b | Blue Swirl | int page_base, int pageh_base, |
518 | 4556bd8b | Blue Swirl | qemu_irq *cpu_request_exit) |
519 | 27503323 | bellard | { |
520 | 27503323 | bellard | int i;
|
521 | 27503323 | bellard | |
522 | 9eb153f1 | bellard | d->dshift = dshift; |
523 | 4556bd8b | Blue Swirl | d->cpu_request_exit = cpu_request_exit; |
524 | 58229933 | Julien Grall | |
525 | 58229933 | Julien Grall | memory_region_init_io(&d->channel_io, &channel_io_ops, d, |
526 | 58229933 | Julien Grall | "dma-chan", 8 << d->dshift); |
527 | 58229933 | Julien Grall | memory_region_add_subregion(isa_address_space_io(NULL),
|
528 | 58229933 | Julien Grall | base, &d->channel_io); |
529 | 58229933 | Julien Grall | |
530 | 58229933 | Julien Grall | isa_register_portio_list(NULL, page_base, page_portio_list, d,
|
531 | 58229933 | Julien Grall | "dma-page");
|
532 | 58229933 | Julien Grall | if (pageh_base >= 0) { |
533 | 58229933 | Julien Grall | isa_register_portio_list(NULL, pageh_base, pageh_portio_list, d,
|
534 | 58229933 | Julien Grall | "dma-pageh");
|
535 | 27503323 | bellard | } |
536 | 58229933 | Julien Grall | |
537 | 58229933 | Julien Grall | memory_region_init_io(&d->cont_io, &cont_io_ops, d, "dma-cont",
|
538 | 58229933 | Julien Grall | 8 << d->dshift);
|
539 | 58229933 | Julien Grall | memory_region_add_subregion(isa_address_space_io(NULL),
|
540 | 58229933 | Julien Grall | base + (8 << d->dshift), &d->cont_io);
|
541 | 58229933 | Julien Grall | |
542 | a08d4367 | Jan Kiszka | qemu_register_reset(dma_reset, d); |
543 | d7d02e3c | bellard | dma_reset(d); |
544 | b1503cda | malc | for (i = 0; i < ARRAY_SIZE (d->regs); ++i) { |
545 | ca9cc28c | balrog | d->regs[i].transfer_handler = dma_phony_handler; |
546 | ca9cc28c | balrog | } |
547 | 9eb153f1 | bellard | } |
548 | 27503323 | bellard | |
549 | 7b5045c5 | Juan Quintela | static const VMStateDescription vmstate_dma_regs = { |
550 | 7b5045c5 | Juan Quintela | .name = "dma_regs",
|
551 | 7b5045c5 | Juan Quintela | .version_id = 1,
|
552 | 7b5045c5 | Juan Quintela | .minimum_version_id = 1,
|
553 | 7b5045c5 | Juan Quintela | .minimum_version_id_old = 1,
|
554 | 7b5045c5 | Juan Quintela | .fields = (VMStateField []) { |
555 | 7b5045c5 | Juan Quintela | VMSTATE_INT32_ARRAY(now, struct dma_regs, 2), |
556 | 7b5045c5 | Juan Quintela | VMSTATE_UINT16_ARRAY(base, struct dma_regs, 2), |
557 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(mode, struct dma_regs),
|
558 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(page, struct dma_regs),
|
559 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(pageh, struct dma_regs),
|
560 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(dack, struct dma_regs),
|
561 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(eop, struct dma_regs),
|
562 | 7b5045c5 | Juan Quintela | VMSTATE_END_OF_LIST() |
563 | 85571bc7 | bellard | } |
564 | 7b5045c5 | Juan Quintela | }; |
565 | 85571bc7 | bellard | |
566 | e59fb374 | Juan Quintela | static int dma_post_load(void *opaque, int version_id) |
567 | 85571bc7 | bellard | { |
568 | 492c30af | aliguori | DMA_run(); |
569 | 492c30af | aliguori | |
570 | 85571bc7 | bellard | return 0; |
571 | 85571bc7 | bellard | } |
572 | 85571bc7 | bellard | |
573 | 7b5045c5 | Juan Quintela | static const VMStateDescription vmstate_dma = { |
574 | 7b5045c5 | Juan Quintela | .name = "dma",
|
575 | 7b5045c5 | Juan Quintela | .version_id = 1,
|
576 | 7b5045c5 | Juan Quintela | .minimum_version_id = 1,
|
577 | 7b5045c5 | Juan Quintela | .minimum_version_id_old = 1,
|
578 | 7b5045c5 | Juan Quintela | .post_load = dma_post_load, |
579 | 7b5045c5 | Juan Quintela | .fields = (VMStateField []) { |
580 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(command, struct dma_cont),
|
581 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(mask, struct dma_cont),
|
582 | 7b5045c5 | Juan Quintela | VMSTATE_UINT8(flip_flop, struct dma_cont),
|
583 | 7b5045c5 | Juan Quintela | VMSTATE_INT32(dshift, struct dma_cont),
|
584 | 7b5045c5 | Juan Quintela | VMSTATE_STRUCT_ARRAY(regs, struct dma_cont, 4, 1, vmstate_dma_regs, struct dma_regs), |
585 | 7b5045c5 | Juan Quintela | VMSTATE_END_OF_LIST() |
586 | 7b5045c5 | Juan Quintela | } |
587 | 7b5045c5 | Juan Quintela | }; |
588 | 7b5045c5 | Juan Quintela | |
589 | 4556bd8b | Blue Swirl | void DMA_init(int high_page_enable, qemu_irq *cpu_request_exit) |
590 | 9eb153f1 | bellard | { |
591 | 85571bc7 | bellard | dma_init2(&dma_controllers[0], 0x00, 0, 0x80, |
592 | 4556bd8b | Blue Swirl | high_page_enable ? 0x480 : -1, cpu_request_exit); |
593 | b0bda528 | bellard | dma_init2(&dma_controllers[1], 0xc0, 1, 0x88, |
594 | 4556bd8b | Blue Swirl | high_page_enable ? 0x488 : -1, cpu_request_exit); |
595 | 0be71e32 | Alex Williamson | vmstate_register (NULL, 0, &vmstate_dma, &dma_controllers[0]); |
596 | 0be71e32 | Alex Williamson | vmstate_register (NULL, 1, &vmstate_dma, &dma_controllers[1]); |
597 | 492c30af | aliguori | |
598 | 492c30af | aliguori | dma_bh = qemu_bh_new(DMA_run_bh, NULL);
|
599 | 27503323 | bellard | } |