root / hw / stellaris_enet.c @ c75a823c
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1 | eea589cc | pbrook | /*
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2 | eea589cc | pbrook | * Luminary Micro Stellaris Ethernet Controller
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3 | eea589cc | pbrook | *
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4 | eea589cc | pbrook | * Copyright (c) 2007 CodeSourcery.
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5 | eea589cc | pbrook | * Written by Paul Brook
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6 | eea589cc | pbrook | *
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7 | eea589cc | pbrook | * This code is licenced under the GPL.
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8 | eea589cc | pbrook | */
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9 | eea589cc | pbrook | #include "hw.h" |
10 | eea589cc | pbrook | #include "arm-misc.h" |
11 | eea589cc | pbrook | #include "net.h" |
12 | eea589cc | pbrook | #include <zlib.h> |
13 | eea589cc | pbrook | |
14 | eea589cc | pbrook | //#define DEBUG_STELLARIS_ENET 1
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15 | eea589cc | pbrook | |
16 | eea589cc | pbrook | #ifdef DEBUG_STELLARIS_ENET
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17 | eea589cc | pbrook | #define DPRINTF(fmt, args...) \
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18 | eea589cc | pbrook | do { printf("stellaris_enet: " fmt , ##args); } while (0) |
19 | eea589cc | pbrook | #define BADF(fmt, args...) \
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20 | eea589cc | pbrook | do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args); exit(1);} while (0) |
21 | eea589cc | pbrook | #else
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22 | eea589cc | pbrook | #define DPRINTF(fmt, args...) do {} while(0) |
23 | eea589cc | pbrook | #define BADF(fmt, args...) \
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24 | eea589cc | pbrook | do { fprintf(stderr, "stellaris_enet: error: " fmt , ##args);} while (0) |
25 | eea589cc | pbrook | #endif
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26 | eea589cc | pbrook | |
27 | eea589cc | pbrook | #define SE_INT_RX 0x01 |
28 | eea589cc | pbrook | #define SE_INT_TXER 0x02 |
29 | eea589cc | pbrook | #define SE_INT_TXEMP 0x04 |
30 | eea589cc | pbrook | #define SE_INT_FOV 0x08 |
31 | eea589cc | pbrook | #define SE_INT_RXER 0x10 |
32 | eea589cc | pbrook | #define SE_INT_MD 0x20 |
33 | eea589cc | pbrook | #define SE_INT_PHY 0x40 |
34 | eea589cc | pbrook | |
35 | eea589cc | pbrook | #define SE_RCTL_RXEN 0x01 |
36 | eea589cc | pbrook | #define SE_RCTL_AMUL 0x02 |
37 | eea589cc | pbrook | #define SE_RCTL_PRMS 0x04 |
38 | eea589cc | pbrook | #define SE_RCTL_BADCRC 0x08 |
39 | eea589cc | pbrook | #define SE_RCTL_RSTFIFO 0x10 |
40 | eea589cc | pbrook | |
41 | eea589cc | pbrook | #define SE_TCTL_TXEN 0x01 |
42 | eea589cc | pbrook | #define SE_TCTL_PADEN 0x02 |
43 | eea589cc | pbrook | #define SE_TCTL_CRC 0x04 |
44 | eea589cc | pbrook | #define SE_TCTL_DUPLEX 0x08 |
45 | eea589cc | pbrook | |
46 | eea589cc | pbrook | typedef struct { |
47 | eea589cc | pbrook | uint32_t base; |
48 | eea589cc | pbrook | uint32_t ris; |
49 | eea589cc | pbrook | uint32_t im; |
50 | eea589cc | pbrook | uint32_t rctl; |
51 | eea589cc | pbrook | uint32_t tctl; |
52 | eea589cc | pbrook | uint32_t thr; |
53 | eea589cc | pbrook | uint32_t mctl; |
54 | eea589cc | pbrook | uint32_t mdv; |
55 | eea589cc | pbrook | uint32_t mtxd; |
56 | eea589cc | pbrook | uint32_t mrxd; |
57 | eea589cc | pbrook | uint32_t np; |
58 | eea589cc | pbrook | int tx_frame_len;
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59 | eea589cc | pbrook | int tx_fifo_len;
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60 | eea589cc | pbrook | uint8_t tx_fifo[2048];
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61 | eea589cc | pbrook | /* Real hardware has a 2k fifo, which works out to be at most 31 packets.
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62 | eea589cc | pbrook | We implement a full 31 packet fifo. */
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63 | eea589cc | pbrook | struct {
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64 | eea589cc | pbrook | uint8_t data[2048];
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65 | eea589cc | pbrook | int len;
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66 | eea589cc | pbrook | } rx[31];
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67 | eea589cc | pbrook | uint8_t *rx_fifo; |
68 | eea589cc | pbrook | int rx_fifo_len;
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69 | eea589cc | pbrook | int next_packet;
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70 | eea589cc | pbrook | VLANClientState *vc; |
71 | eea589cc | pbrook | qemu_irq irq; |
72 | eea589cc | pbrook | uint8_t macaddr[6];
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73 | eea589cc | pbrook | } stellaris_enet_state; |
74 | eea589cc | pbrook | |
75 | eea589cc | pbrook | static void stellaris_enet_update(stellaris_enet_state *s) |
76 | eea589cc | pbrook | { |
77 | eea589cc | pbrook | qemu_set_irq(s->irq, (s->ris & s->im) != 0);
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78 | eea589cc | pbrook | } |
79 | eea589cc | pbrook | |
80 | eea589cc | pbrook | /* TODO: Implement MAC address filtering. */
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81 | eea589cc | pbrook | static void stellaris_enet_receive(void *opaque, const uint8_t *buf, int size) |
82 | eea589cc | pbrook | { |
83 | eea589cc | pbrook | stellaris_enet_state *s = (stellaris_enet_state *)opaque; |
84 | eea589cc | pbrook | int n;
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85 | eea589cc | pbrook | uint8_t *p; |
86 | eea589cc | pbrook | uint32_t crc; |
87 | eea589cc | pbrook | |
88 | eea589cc | pbrook | if ((s->rctl & SE_RCTL_RXEN) == 0) |
89 | eea589cc | pbrook | return;
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90 | eea589cc | pbrook | if (s->np >= 31) { |
91 | eea589cc | pbrook | DPRINTF("Packet dropped\n");
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92 | eea589cc | pbrook | return;
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93 | eea589cc | pbrook | } |
94 | eea589cc | pbrook | |
95 | eea589cc | pbrook | DPRINTF("Received packet len=%d\n", size);
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96 | eea589cc | pbrook | n = s->next_packet + s->np; |
97 | eea589cc | pbrook | if (n >= 31) |
98 | eea589cc | pbrook | n -= 31;
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99 | eea589cc | pbrook | s->np++; |
100 | eea589cc | pbrook | |
101 | eea589cc | pbrook | s->rx[n].len = size + 6;
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102 | eea589cc | pbrook | p = s->rx[n].data; |
103 | eea589cc | pbrook | *(p++) = (size + 6);
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104 | eea589cc | pbrook | *(p++) = (size + 6) >> 8; |
105 | eea589cc | pbrook | memcpy (p, buf, size); |
106 | eea589cc | pbrook | p += size; |
107 | eea589cc | pbrook | crc = crc32(~0, buf, size);
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108 | eea589cc | pbrook | *(p++) = crc; |
109 | eea589cc | pbrook | *(p++) = crc >> 8;
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110 | eea589cc | pbrook | *(p++) = crc >> 16;
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111 | eea589cc | pbrook | *(p++) = crc >> 24;
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112 | eea589cc | pbrook | /* Clear the remaining bytes in the last word. */
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113 | eea589cc | pbrook | if ((size & 3) != 2) { |
114 | eea589cc | pbrook | memset(p, 0, (6 - size) & 3); |
115 | eea589cc | pbrook | } |
116 | eea589cc | pbrook | |
117 | eea589cc | pbrook | s->ris |= SE_INT_RX; |
118 | eea589cc | pbrook | stellaris_enet_update(s); |
119 | eea589cc | pbrook | } |
120 | eea589cc | pbrook | |
121 | eea589cc | pbrook | static int stellaris_enet_can_receive(void *opaque) |
122 | eea589cc | pbrook | { |
123 | eea589cc | pbrook | stellaris_enet_state *s = (stellaris_enet_state *)opaque; |
124 | eea589cc | pbrook | |
125 | eea589cc | pbrook | if ((s->rctl & SE_RCTL_RXEN) == 0) |
126 | eea589cc | pbrook | return 1; |
127 | eea589cc | pbrook | |
128 | eea589cc | pbrook | return (s->np < 31); |
129 | eea589cc | pbrook | } |
130 | eea589cc | pbrook | |
131 | eea589cc | pbrook | static uint32_t stellaris_enet_read(void *opaque, target_phys_addr_t offset) |
132 | eea589cc | pbrook | { |
133 | eea589cc | pbrook | stellaris_enet_state *s = (stellaris_enet_state *)opaque; |
134 | eea589cc | pbrook | uint32_t val; |
135 | eea589cc | pbrook | |
136 | eea589cc | pbrook | offset -= s->base; |
137 | eea589cc | pbrook | switch (offset) {
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138 | eea589cc | pbrook | case 0x00: /* RIS */ |
139 | eea589cc | pbrook | DPRINTF("IRQ status %02x\n", s->ris);
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140 | eea589cc | pbrook | return s->ris;
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141 | eea589cc | pbrook | case 0x04: /* IM */ |
142 | eea589cc | pbrook | return s->im;
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143 | eea589cc | pbrook | case 0x08: /* RCTL */ |
144 | eea589cc | pbrook | return s->rctl;
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145 | eea589cc | pbrook | case 0x0c: /* TCTL */ |
146 | eea589cc | pbrook | return s->tctl;
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147 | eea589cc | pbrook | case 0x10: /* DATA */ |
148 | eea589cc | pbrook | if (s->rx_fifo_len == 0) { |
149 | eea589cc | pbrook | if (s->np == 0) { |
150 | eea589cc | pbrook | BADF("RX underflow\n");
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151 | eea589cc | pbrook | return 0; |
152 | eea589cc | pbrook | } |
153 | eea589cc | pbrook | s->rx_fifo_len = s->rx[s->next_packet].len; |
154 | eea589cc | pbrook | s->rx_fifo = s->rx[s->next_packet].data; |
155 | eea589cc | pbrook | DPRINTF("RX FIFO start packet len=%d\n", s->rx_fifo_len);
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156 | eea589cc | pbrook | } |
157 | eea589cc | pbrook | val = s->rx_fifo[0] | (s->rx_fifo[1] << 8) | (s->rx_fifo[2] << 16) |
158 | eea589cc | pbrook | | (s->rx_fifo[3] << 24); |
159 | eea589cc | pbrook | s->rx_fifo += 4;
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160 | eea589cc | pbrook | s->rx_fifo_len -= 4;
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161 | eea589cc | pbrook | if (s->rx_fifo_len <= 0) { |
162 | eea589cc | pbrook | s->rx_fifo_len = 0;
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163 | eea589cc | pbrook | s->next_packet++; |
164 | eea589cc | pbrook | if (s->next_packet >= 31) |
165 | eea589cc | pbrook | s->next_packet = 0;
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166 | eea589cc | pbrook | s->np--; |
167 | eea589cc | pbrook | DPRINTF("RX done np=%d\n", s->np);
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168 | eea589cc | pbrook | } |
169 | eea589cc | pbrook | return val;
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170 | eea589cc | pbrook | case 0x14: /* IA0 */ |
171 | eea589cc | pbrook | return s->macaddr[0] | (s->macaddr[1] << 8) |
172 | eea589cc | pbrook | | (s->macaddr[2] << 16) | (s->macaddr[3] << 24); |
173 | eea589cc | pbrook | case 0x18: /* IA1 */ |
174 | eea589cc | pbrook | return s->macaddr[4] | (s->macaddr[5] << 8); |
175 | eea589cc | pbrook | case 0x1c: /* THR */ |
176 | eea589cc | pbrook | return s->thr;
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177 | eea589cc | pbrook | case 0x20: /* MCTL */ |
178 | eea589cc | pbrook | return s->mctl;
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179 | eea589cc | pbrook | case 0x24: /* MDV */ |
180 | eea589cc | pbrook | return s->mdv;
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181 | eea589cc | pbrook | case 0x28: /* MADD */ |
182 | eea589cc | pbrook | return 0; |
183 | eea589cc | pbrook | case 0x2c: /* MTXD */ |
184 | eea589cc | pbrook | return s->mtxd;
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185 | eea589cc | pbrook | case 0x30: /* MRXD */ |
186 | eea589cc | pbrook | return s->mrxd;
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187 | eea589cc | pbrook | case 0x34: /* NP */ |
188 | eea589cc | pbrook | return s->np;
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189 | eea589cc | pbrook | case 0x38: /* TR */ |
190 | eea589cc | pbrook | return 0; |
191 | eea589cc | pbrook | case 0x3c: /* Undocuented: Timestamp? */ |
192 | eea589cc | pbrook | return 0; |
193 | eea589cc | pbrook | default:
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194 | eea589cc | pbrook | cpu_abort (cpu_single_env, "stellaris_enet_read: Bad offset %x\n",
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195 | eea589cc | pbrook | (int)offset);
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196 | eea589cc | pbrook | return 0; |
197 | eea589cc | pbrook | } |
198 | eea589cc | pbrook | } |
199 | eea589cc | pbrook | |
200 | eea589cc | pbrook | static void stellaris_enet_write(void *opaque, target_phys_addr_t offset, |
201 | eea589cc | pbrook | uint32_t value) |
202 | eea589cc | pbrook | { |
203 | eea589cc | pbrook | stellaris_enet_state *s = (stellaris_enet_state *)opaque; |
204 | eea589cc | pbrook | |
205 | eea589cc | pbrook | offset -= s->base; |
206 | eea589cc | pbrook | switch (offset) {
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207 | eea589cc | pbrook | case 0x00: /* IACK */ |
208 | eea589cc | pbrook | s->ris &= ~value; |
209 | eea589cc | pbrook | DPRINTF("IRQ ack %02x/%02x\n", value, s->ris);
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210 | eea589cc | pbrook | stellaris_enet_update(s); |
211 | eea589cc | pbrook | /* Clearing TXER also resets the TX fifo. */
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212 | eea589cc | pbrook | if (value & SE_INT_TXER)
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213 | eea589cc | pbrook | s->tx_frame_len = -1;
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214 | eea589cc | pbrook | break;
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215 | eea589cc | pbrook | case 0x04: /* IM */ |
216 | eea589cc | pbrook | DPRINTF("IRQ mask %02x/%02x\n", value, s->ris);
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217 | eea589cc | pbrook | s->im = value; |
218 | eea589cc | pbrook | stellaris_enet_update(s); |
219 | eea589cc | pbrook | break;
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220 | eea589cc | pbrook | case 0x08: /* RCTL */ |
221 | eea589cc | pbrook | s->rctl = value; |
222 | eea589cc | pbrook | if (value & SE_RCTL_RSTFIFO) {
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223 | eea589cc | pbrook | s->rx_fifo_len = 0;
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224 | eea589cc | pbrook | s->np = 0;
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225 | eea589cc | pbrook | stellaris_enet_update(s); |
226 | eea589cc | pbrook | } |
227 | eea589cc | pbrook | break;
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228 | eea589cc | pbrook | case 0x0c: /* TCTL */ |
229 | eea589cc | pbrook | s->tctl = value; |
230 | eea589cc | pbrook | break;
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231 | eea589cc | pbrook | case 0x10: /* DATA */ |
232 | eea589cc | pbrook | if (s->tx_frame_len == -1) { |
233 | eea589cc | pbrook | s->tx_frame_len = value & 0xffff;
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234 | eea589cc | pbrook | if (s->tx_frame_len > 2032) { |
235 | eea589cc | pbrook | DPRINTF("TX frame too long (%d)\n", s->tx_frame_len);
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236 | eea589cc | pbrook | s->tx_frame_len = 0;
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237 | eea589cc | pbrook | s->ris |= SE_INT_TXER; |
238 | eea589cc | pbrook | stellaris_enet_update(s); |
239 | eea589cc | pbrook | } else {
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240 | eea589cc | pbrook | DPRINTF("Start TX frame len=%d\n", s->tx_frame_len);
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241 | eea589cc | pbrook | /* The value written does not include the ethernet header. */
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242 | eea589cc | pbrook | s->tx_frame_len += 14;
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243 | eea589cc | pbrook | if ((s->tctl & SE_TCTL_CRC) == 0) |
244 | eea589cc | pbrook | s->tx_frame_len += 4;
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245 | eea589cc | pbrook | s->tx_fifo_len = 0;
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246 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value >> 16;
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247 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value >> 24;
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248 | eea589cc | pbrook | } |
249 | eea589cc | pbrook | } else {
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250 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value; |
251 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value >> 8;
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252 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value >> 16;
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253 | eea589cc | pbrook | s->tx_fifo[s->tx_fifo_len++] = value >> 24;
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254 | eea589cc | pbrook | if (s->tx_fifo_len >= s->tx_frame_len) {
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255 | eea589cc | pbrook | /* We don't implement explicit CRC, so just chop it off. */
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256 | eea589cc | pbrook | if ((s->tctl & SE_TCTL_CRC) == 0) |
257 | eea589cc | pbrook | s->tx_frame_len -= 4;
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258 | eea589cc | pbrook | if ((s->tctl & SE_TCTL_PADEN) && s->tx_frame_len < 60) { |
259 | eea589cc | pbrook | memset(&s->tx_fifo[s->tx_frame_len], 0, 60 - s->tx_frame_len); |
260 | eea589cc | pbrook | s->tx_fifo_len = 60;
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261 | eea589cc | pbrook | } |
262 | eea589cc | pbrook | qemu_send_packet(s->vc, s->tx_fifo, s->tx_frame_len); |
263 | eea589cc | pbrook | s->tx_frame_len = -1;
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264 | eea589cc | pbrook | s->ris |= SE_INT_TXEMP; |
265 | eea589cc | pbrook | stellaris_enet_update(s); |
266 | eea589cc | pbrook | DPRINTF("Done TX\n");
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267 | eea589cc | pbrook | } |
268 | eea589cc | pbrook | } |
269 | eea589cc | pbrook | break;
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270 | eea589cc | pbrook | case 0x14: /* IA0 */ |
271 | eea589cc | pbrook | s->macaddr[0] = value;
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272 | eea589cc | pbrook | s->macaddr[1] = value >> 8; |
273 | eea589cc | pbrook | s->macaddr[2] = value >> 16; |
274 | eea589cc | pbrook | s->macaddr[3] = value >> 24; |
275 | eea589cc | pbrook | break;
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276 | eea589cc | pbrook | case 0x18: /* IA1 */ |
277 | eea589cc | pbrook | s->macaddr[4] = value;
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278 | eea589cc | pbrook | s->macaddr[5] = value >> 8; |
279 | eea589cc | pbrook | break;
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280 | eea589cc | pbrook | case 0x1c: /* THR */ |
281 | eea589cc | pbrook | s->thr = value; |
282 | eea589cc | pbrook | break;
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283 | eea589cc | pbrook | case 0x20: /* MCTL */ |
284 | eea589cc | pbrook | s->mctl = value; |
285 | eea589cc | pbrook | break;
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286 | eea589cc | pbrook | case 0x24: /* MDV */ |
287 | eea589cc | pbrook | s->mdv = value; |
288 | eea589cc | pbrook | break;
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289 | eea589cc | pbrook | case 0x28: /* MADD */ |
290 | eea589cc | pbrook | /* ignored. */
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291 | eea589cc | pbrook | break;
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292 | eea589cc | pbrook | case 0x2c: /* MTXD */ |
293 | eea589cc | pbrook | s->mtxd = value & 0xff;
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294 | eea589cc | pbrook | break;
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295 | eea589cc | pbrook | case 0x30: /* MRXD */ |
296 | eea589cc | pbrook | case 0x34: /* NP */ |
297 | eea589cc | pbrook | case 0x38: /* TR */ |
298 | eea589cc | pbrook | /* Ignored. */
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299 | eea589cc | pbrook | case 0x3c: /* Undocuented: Timestamp? */ |
300 | eea589cc | pbrook | /* Ignored. */
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301 | eea589cc | pbrook | break;
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302 | eea589cc | pbrook | default:
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303 | eea589cc | pbrook | cpu_abort (cpu_single_env, "stellaris_enet_write: Bad offset %x\n",
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304 | eea589cc | pbrook | (int)offset);
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305 | eea589cc | pbrook | } |
306 | eea589cc | pbrook | } |
307 | eea589cc | pbrook | |
308 | eea589cc | pbrook | static CPUReadMemoryFunc *stellaris_enet_readfn[] = {
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309 | eea589cc | pbrook | stellaris_enet_read, |
310 | eea589cc | pbrook | stellaris_enet_read, |
311 | eea589cc | pbrook | stellaris_enet_read |
312 | eea589cc | pbrook | }; |
313 | eea589cc | pbrook | |
314 | eea589cc | pbrook | static CPUWriteMemoryFunc *stellaris_enet_writefn[] = {
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315 | eea589cc | pbrook | stellaris_enet_write, |
316 | eea589cc | pbrook | stellaris_enet_write, |
317 | eea589cc | pbrook | stellaris_enet_write |
318 | eea589cc | pbrook | }; |
319 | eea589cc | pbrook | static void stellaris_enet_reset(stellaris_enet_state *s) |
320 | eea589cc | pbrook | { |
321 | eea589cc | pbrook | s->mdv = 0x80;
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322 | eea589cc | pbrook | s->rctl = SE_RCTL_BADCRC; |
323 | eea589cc | pbrook | s->im = SE_INT_PHY | SE_INT_MD | SE_INT_RXER | SE_INT_FOV | SE_INT_TXEMP |
324 | eea589cc | pbrook | | SE_INT_TXER | SE_INT_RX; |
325 | eea589cc | pbrook | s->thr = 0x3f;
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326 | eea589cc | pbrook | s->tx_frame_len = -1;
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327 | eea589cc | pbrook | } |
328 | eea589cc | pbrook | |
329 | eea589cc | pbrook | void stellaris_enet_init(NICInfo *nd, uint32_t base, qemu_irq irq)
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330 | eea589cc | pbrook | { |
331 | eea589cc | pbrook | stellaris_enet_state *s; |
332 | eea589cc | pbrook | int iomemtype;
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333 | eea589cc | pbrook | |
334 | eea589cc | pbrook | s = (stellaris_enet_state *)qemu_mallocz(sizeof(stellaris_enet_state));
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335 | eea589cc | pbrook | iomemtype = cpu_register_io_memory(0, stellaris_enet_readfn,
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336 | eea589cc | pbrook | stellaris_enet_writefn, s); |
337 | eea589cc | pbrook | cpu_register_physical_memory(base, 0x00001000, iomemtype);
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338 | eea589cc | pbrook | s->base = base; |
339 | eea589cc | pbrook | s->irq = irq; |
340 | eea589cc | pbrook | memcpy(s->macaddr, nd->macaddr, 6);
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341 | eea589cc | pbrook | |
342 | eea589cc | pbrook | if (nd->vlan)
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343 | eea589cc | pbrook | s->vc = qemu_new_vlan_client(nd->vlan, stellaris_enet_receive, |
344 | eea589cc | pbrook | stellaris_enet_can_receive, s); |
345 | eea589cc | pbrook | |
346 | eea589cc | pbrook | stellaris_enet_reset(s); |
347 | eea589cc | pbrook | } |