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net/cadence_gem: Update DMA rx descriptors as we process them
[qemu.git] / hw / net / cadence_gem.c
blobb84ee609427dc6ed3352c6ddd71dce049930611e
1 /*
2 * QEMU Xilinx GEM emulation
3 *
4 * Copyright (c) 2011 Xilinx, Inc.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a copy
7 * of this software and associated documentation files (the "Software"), to deal
8 * in the Software without restriction, including without limitation the rights
9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
10 * copies of the Software, and to permit persons to whom the Software is
11 * furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
22 * THE SOFTWARE.
23 */
24
25 #include <zlib.h> /* For crc32 */
26
27 #include "hw/sysbus.h"
28 #include "net/net.h"
29 #include "net/checksum.h"
30
31 #ifdef CADENCE_GEM_ERR_DEBUG
32 #define DB_PRINT(...) do { \
33 fprintf(stderr, ": %s: ", __func__); \
34 fprintf(stderr, ## __VA_ARGS__); \
35 } while (0);
36 #else
37 #define DB_PRINT(...)
38 #endif
39
40 #define GEM_NWCTRL (0x00000000/4) /* Network Control reg */
41 #define GEM_NWCFG (0x00000004/4) /* Network Config reg */
42 #define GEM_NWSTATUS (0x00000008/4) /* Network Status reg */
43 #define GEM_USERIO (0x0000000C/4) /* User IO reg */
44 #define GEM_DMACFG (0x00000010/4) /* DMA Control reg */
45 #define GEM_TXSTATUS (0x00000014/4) /* TX Status reg */
46 #define GEM_RXQBASE (0x00000018/4) /* RX Q Base address reg */
47 #define GEM_TXQBASE (0x0000001C/4) /* TX Q Base address reg */
48 #define GEM_RXSTATUS (0x00000020/4) /* RX Status reg */
49 #define GEM_ISR (0x00000024/4) /* Interrupt Status reg */
50 #define GEM_IER (0x00000028/4) /* Interrupt Enable reg */
51 #define GEM_IDR (0x0000002C/4) /* Interrupt Disable reg */
52 #define GEM_IMR (0x00000030/4) /* Interrupt Mask reg */
53 #define GEM_PHYMNTNC (0x00000034/4) /* Phy Maintaince reg */
54 #define GEM_RXPAUSE (0x00000038/4) /* RX Pause Time reg */
55 #define GEM_TXPAUSE (0x0000003C/4) /* TX Pause Time reg */
56 #define GEM_TXPARTIALSF (0x00000040/4) /* TX Partial Store and Forward */
57 #define GEM_RXPARTIALSF (0x00000044/4) /* RX Partial Store and Forward */
58 #define GEM_HASHLO (0x00000080/4) /* Hash Low address reg */
59 #define GEM_HASHHI (0x00000084/4) /* Hash High address reg */
60 #define GEM_SPADDR1LO (0x00000088/4) /* Specific addr 1 low reg */
61 #define GEM_SPADDR1HI (0x0000008C/4) /* Specific addr 1 high reg */
62 #define GEM_SPADDR2LO (0x00000090/4) /* Specific addr 2 low reg */
63 #define GEM_SPADDR2HI (0x00000094/4) /* Specific addr 2 high reg */
64 #define GEM_SPADDR3LO (0x00000098/4) /* Specific addr 3 low reg */
65 #define GEM_SPADDR3HI (0x0000009C/4) /* Specific addr 3 high reg */
66 #define GEM_SPADDR4LO (0x000000A0/4) /* Specific addr 4 low reg */
67 #define GEM_SPADDR4HI (0x000000A4/4) /* Specific addr 4 high reg */
68 #define GEM_TIDMATCH1 (0x000000A8/4) /* Type ID1 Match reg */
69 #define GEM_TIDMATCH2 (0x000000AC/4) /* Type ID2 Match reg */
70 #define GEM_TIDMATCH3 (0x000000B0/4) /* Type ID3 Match reg */
71 #define GEM_TIDMATCH4 (0x000000B4/4) /* Type ID4 Match reg */
72 #define GEM_WOLAN (0x000000B8/4) /* Wake on LAN reg */
73 #define GEM_IPGSTRETCH (0x000000BC/4) /* IPG Stretch reg */
74 #define GEM_SVLAN (0x000000C0/4) /* Stacked VLAN reg */
75 #define GEM_MODID (0x000000FC/4) /* Module ID reg */
76 #define GEM_OCTTXLO (0x00000100/4) /* Octects transmitted Low reg */
77 #define GEM_OCTTXHI (0x00000104/4) /* Octects transmitted High reg */
78 #define GEM_TXCNT (0x00000108/4) /* Error-free Frames transmitted */
79 #define GEM_TXBCNT (0x0000010C/4) /* Error-free Broadcast Frames */
80 #define GEM_TXMCNT (0x00000110/4) /* Error-free Multicast Frame */
81 #define GEM_TXPAUSECNT (0x00000114/4) /* Pause Frames Transmitted */
82 #define GEM_TX64CNT (0x00000118/4) /* Error-free 64 TX */
83 #define GEM_TX65CNT (0x0000011C/4) /* Error-free 65-127 TX */
84 #define GEM_TX128CNT (0x00000120/4) /* Error-free 128-255 TX */
85 #define GEM_TX256CNT (0x00000124/4) /* Error-free 256-511 */
86 #define GEM_TX512CNT (0x00000128/4) /* Error-free 512-1023 TX */
87 #define GEM_TX1024CNT (0x0000012C/4) /* Error-free 1024-1518 TX */
88 #define GEM_TX1519CNT (0x00000130/4) /* Error-free larger than 1519 TX */
89 #define GEM_TXURUNCNT (0x00000134/4) /* TX under run error counter */
90 #define GEM_SINGLECOLLCNT (0x00000138/4) /* Single Collision Frames */
91 #define GEM_MULTCOLLCNT (0x0000013C/4) /* Multiple Collision Frames */
92 #define GEM_EXCESSCOLLCNT (0x00000140/4) /* Excessive Collision Frames */
93 #define GEM_LATECOLLCNT (0x00000144/4) /* Late Collision Frames */
94 #define GEM_DEFERTXCNT (0x00000148/4) /* Deferred Transmission Frames */
95 #define GEM_CSENSECNT (0x0000014C/4) /* Carrier Sense Error Counter */
96 #define GEM_OCTRXLO (0x00000150/4) /* Octects Received register Low */
97 #define GEM_OCTRXHI (0x00000154/4) /* Octects Received register High */
98 #define GEM_RXCNT (0x00000158/4) /* Error-free Frames Received */
99 #define GEM_RXBROADCNT (0x0000015C/4) /* Error-free Broadcast Frames RX */
100 #define GEM_RXMULTICNT (0x00000160/4) /* Error-free Multicast Frames RX */
101 #define GEM_RXPAUSECNT (0x00000164/4) /* Pause Frames Received Counter */
102 #define GEM_RX64CNT (0x00000168/4) /* Error-free 64 byte Frames RX */
103 #define GEM_RX65CNT (0x0000016C/4) /* Error-free 65-127B Frames RX */
104 #define GEM_RX128CNT (0x00000170/4) /* Error-free 128-255B Frames RX */
105 #define GEM_RX256CNT (0x00000174/4) /* Error-free 256-512B Frames RX */
106 #define GEM_RX512CNT (0x00000178/4) /* Error-free 512-1023B Frames RX */
107 #define GEM_RX1024CNT (0x0000017C/4) /* Error-free 1024-1518B Frames RX */
108 #define GEM_RX1519CNT (0x00000180/4) /* Error-free 1519-max Frames RX */
109 #define GEM_RXUNDERCNT (0x00000184/4) /* Undersize Frames Received */
110 #define GEM_RXOVERCNT (0x00000188/4) /* Oversize Frames Received */
111 #define GEM_RXJABCNT (0x0000018C/4) /* Jabbers Received Counter */
112 #define GEM_RXFCSCNT (0x00000190/4) /* Frame Check seq. Error Counter */
113 #define GEM_RXLENERRCNT (0x00000194/4) /* Length Field Error Counter */
114 #define GEM_RXSYMERRCNT (0x00000198/4) /* Symbol Error Counter */
115 #define GEM_RXALIGNERRCNT (0x0000019C/4) /* Alignment Error Counter */
116 #define GEM_RXRSCERRCNT (0x000001A0/4) /* Receive Resource Error Counter */
117 #define GEM_RXORUNCNT (0x000001A4/4) /* Receive Overrun Counter */
118 #define GEM_RXIPCSERRCNT (0x000001A8/4) /* IP header Checksum Error Counter */
119 #define GEM_RXTCPCCNT (0x000001AC/4) /* TCP Checksum Error Counter */
120 #define GEM_RXUDPCCNT (0x000001B0/4) /* UDP Checksum Error Counter */
121
122 #define GEM_1588S (0x000001D0/4) /* 1588 Timer Seconds */
123 #define GEM_1588NS (0x000001D4/4) /* 1588 Timer Nanoseconds */
124 #define GEM_1588ADJ (0x000001D8/4) /* 1588 Timer Adjust */
125 #define GEM_1588INC (0x000001DC/4) /* 1588 Timer Increment */
126 #define GEM_PTPETXS (0x000001E0/4) /* PTP Event Frame Transmitted (s) */
127 #define GEM_PTPETXNS (0x000001E4/4) /* PTP Event Frame Transmitted (ns) */
128 #define GEM_PTPERXS (0x000001E8/4) /* PTP Event Frame Received (s) */
129 #define GEM_PTPERXNS (0x000001EC/4) /* PTP Event Frame Received (ns) */
130 #define GEM_PTPPTXS (0x000001E0/4) /* PTP Peer Frame Transmitted (s) */
131 #define GEM_PTPPTXNS (0x000001E4/4) /* PTP Peer Frame Transmitted (ns) */
132 #define GEM_PTPPRXS (0x000001E8/4) /* PTP Peer Frame Received (s) */
133 #define GEM_PTPPRXNS (0x000001EC/4) /* PTP Peer Frame Received (ns) */
134
135 /* Design Configuration Registers */
136 #define GEM_DESCONF (0x00000280/4)
137 #define GEM_DESCONF2 (0x00000284/4)
138 #define GEM_DESCONF3 (0x00000288/4)
139 #define GEM_DESCONF4 (0x0000028C/4)
140 #define GEM_DESCONF5 (0x00000290/4)
141 #define GEM_DESCONF6 (0x00000294/4)
142 #define GEM_DESCONF7 (0x00000298/4)
143
144 #define GEM_MAXREG (0x00000640/4) /* Last valid GEM address */
145
146 /*****************************************/
147 #define GEM_NWCTRL_TXSTART 0x00000200 /* Transmit Enable */
148 #define GEM_NWCTRL_TXENA 0x00000008 /* Transmit Enable */
149 #define GEM_NWCTRL_RXENA 0x00000004 /* Receive Enable */
150 #define GEM_NWCTRL_LOCALLOOP 0x00000002 /* Local Loopback */
151
152 #define GEM_NWCFG_STRIP_FCS 0x00020000 /* Strip FCS field */
153 #define GEM_NWCFG_LERR_DISC 0x00010000 /* Discard RX frames with lenth err */
154 #define GEM_NWCFG_BUFF_OFST_M 0x0000C000 /* Receive buffer offset mask */
155 #define GEM_NWCFG_BUFF_OFST_S 14 /* Receive buffer offset shift */
156 #define GEM_NWCFG_UCAST_HASH 0x00000080 /* accept unicast if hash match */
157 #define GEM_NWCFG_MCAST_HASH 0x00000040 /* accept multicast if hash match */
158 #define GEM_NWCFG_BCAST_REJ 0x00000020 /* Reject broadcast packets */
159 #define GEM_NWCFG_PROMISC 0x00000010 /* Accept all packets */
160
161 #define GEM_DMACFG_RBUFSZ_M 0x007F0000 /* DMA RX Buffer Size mask */
162 #define GEM_DMACFG_RBUFSZ_S 16 /* DMA RX Buffer Size shift */
163 #define GEM_DMACFG_RBUFSZ_MUL 64 /* DMA RX Buffer Size multiplier */
164 #define GEM_DMACFG_TXCSUM_OFFL 0x00000800 /* Transmit checksum offload */
165
166 #define GEM_TXSTATUS_TXCMPL 0x00000020 /* Transmit Complete */
167 #define GEM_TXSTATUS_USED 0x00000001 /* sw owned descriptor encountered */
168
169 #define GEM_RXSTATUS_FRMRCVD 0x00000002 /* Frame received */
170 #define GEM_RXSTATUS_NOBUF 0x00000001 /* Buffer unavailable */
171
172 /* GEM_ISR GEM_IER GEM_IDR GEM_IMR */
173 #define GEM_INT_TXCMPL 0x00000080 /* Transmit Complete */
174 #define GEM_INT_TXUSED 0x00000008
175 #define GEM_INT_RXUSED 0x00000004
176 #define GEM_INT_RXCMPL 0x00000002
177
178 #define GEM_PHYMNTNC_OP_R 0x20000000 /* read operation */
179 #define GEM_PHYMNTNC_OP_W 0x10000000 /* write operation */
180 #define GEM_PHYMNTNC_ADDR 0x0F800000 /* Address bits */
181 #define GEM_PHYMNTNC_ADDR_SHFT 23
182 #define GEM_PHYMNTNC_REG 0x007C0000 /* register bits */
183 #define GEM_PHYMNTNC_REG_SHIFT 18
184
185 /* Marvell PHY definitions */
186 #define BOARD_PHY_ADDRESS 23 /* PHY address we will emulate a device at */
187
188 #define PHY_REG_CONTROL 0
189 #define PHY_REG_STATUS 1
190 #define PHY_REG_PHYID1 2
191 #define PHY_REG_PHYID2 3
192 #define PHY_REG_ANEGADV 4
193 #define PHY_REG_LINKPABIL 5
194 #define PHY_REG_ANEGEXP 6
195 #define PHY_REG_NEXTP 7
196 #define PHY_REG_LINKPNEXTP 8
197 #define PHY_REG_100BTCTRL 9
198 #define PHY_REG_1000BTSTAT 10
199 #define PHY_REG_EXTSTAT 15
200 #define PHY_REG_PHYSPCFC_CTL 16
201 #define PHY_REG_PHYSPCFC_ST 17
202 #define PHY_REG_INT_EN 18
203 #define PHY_REG_INT_ST 19
204 #define PHY_REG_EXT_PHYSPCFC_CTL 20
205 #define PHY_REG_RXERR 21
206 #define PHY_REG_EACD 22
207 #define PHY_REG_LED 24
208 #define PHY_REG_LED_OVRD 25
209 #define PHY_REG_EXT_PHYSPCFC_CTL2 26
210 #define PHY_REG_EXT_PHYSPCFC_ST 27
211 #define PHY_REG_CABLE_DIAG 28
212
213 #define PHY_REG_CONTROL_RST 0x8000
214 #define PHY_REG_CONTROL_LOOP 0x4000
215 #define PHY_REG_CONTROL_ANEG 0x1000
216
217 #define PHY_REG_STATUS_LINK 0x0004
218 #define PHY_REG_STATUS_ANEGCMPL 0x0020
219
220 #define PHY_REG_INT_ST_ANEGCMPL 0x0800
221 #define PHY_REG_INT_ST_LINKC 0x0400
222 #define PHY_REG_INT_ST_ENERGY 0x0010
223
224 /***********************************************************************/
225 #define GEM_RX_REJECT 1
226 #define GEM_RX_ACCEPT 0
227
228 /***********************************************************************/
229
230 #define DESC_1_USED 0x80000000
231 #define DESC_1_LENGTH 0x00001FFF
232
233 #define DESC_1_TX_WRAP 0x40000000
234 #define DESC_1_TX_LAST 0x00008000
235
236 #define DESC_0_RX_WRAP 0x00000002
237 #define DESC_0_RX_OWNERSHIP 0x00000001
238
239 #define DESC_1_RX_SOF 0x00004000
240 #define DESC_1_RX_EOF 0x00008000
241
242 static inline unsigned tx_desc_get_buffer(unsigned *desc)
243 {
244 return desc[0];
245 }
246
247 static inline unsigned tx_desc_get_used(unsigned *desc)
248 {
249 return (desc[1] & DESC_1_USED) ? 1 : 0;
250 }
251
252 static inline void tx_desc_set_used(unsigned *desc)
253 {
254 desc[1] |= DESC_1_USED;
255 }
256
257 static inline unsigned tx_desc_get_wrap(unsigned *desc)
258 {
259 return (desc[1] & DESC_1_TX_WRAP) ? 1 : 0;
260 }
261
262 static inline unsigned tx_desc_get_last(unsigned *desc)
263 {
264 return (desc[1] & DESC_1_TX_LAST) ? 1 : 0;
265 }
266
267 static inline unsigned tx_desc_get_length(unsigned *desc)
268 {
269 return desc[1] & DESC_1_LENGTH;
270 }
271
272 static inline void print_gem_tx_desc(unsigned *desc)
273 {
274 DB_PRINT("TXDESC:\n");
275 DB_PRINT("bufaddr: 0x%08x\n", *desc);
276 DB_PRINT("used_hw: %d\n", tx_desc_get_used(desc));
277 DB_PRINT("wrap: %d\n", tx_desc_get_wrap(desc));
278 DB_PRINT("last: %d\n", tx_desc_get_last(desc));
279 DB_PRINT("length: %d\n", tx_desc_get_length(desc));
280 }
281
282 static inline unsigned rx_desc_get_buffer(unsigned *desc)
283 {
284 return desc[0] & ~0x3UL;
285 }
286
287 static inline unsigned rx_desc_get_wrap(unsigned *desc)
288 {
289 return desc[0] & DESC_0_RX_WRAP ? 1 : 0;
290 }
291
292 static inline unsigned rx_desc_get_ownership(unsigned *desc)
293 {
294 return desc[0] & DESC_0_RX_OWNERSHIP ? 1 : 0;
295 }
296
297 static inline void rx_desc_set_ownership(unsigned *desc)
298 {
299 desc[0] |= DESC_0_RX_OWNERSHIP;
300 }
301
302 static inline void rx_desc_set_sof(unsigned *desc)
303 {
304 desc[1] |= DESC_1_RX_SOF;
305 }
306
307 static inline void rx_desc_set_eof(unsigned *desc)
308 {
309 desc[1] |= DESC_1_RX_EOF;
310 }
311
312 static inline void rx_desc_set_length(unsigned *desc, unsigned len)
313 {
314 desc[1] &= ~DESC_1_LENGTH;
315 desc[1] |= len;
316 }
317
318 #define TYPE_CADENCE_GEM "cadence_gem"
319 #define GEM(obj) OBJECT_CHECK(GemState, (obj), TYPE_CADENCE_GEM)
320
321 typedef struct GemState {
322 SysBusDevice parent_obj;
323
324 MemoryRegion iomem;
325 NICState *nic;
326 NICConf conf;
327 qemu_irq irq;
328
329 /* GEM registers backing store */
330 uint32_t regs[GEM_MAXREG];
331 /* Mask of register bits which are write only */
332 uint32_t regs_wo[GEM_MAXREG];
333 /* Mask of register bits which are read only */
334 uint32_t regs_ro[GEM_MAXREG];
335 /* Mask of register bits which are clear on read */
336 uint32_t regs_rtc[GEM_MAXREG];
337 /* Mask of register bits which are write 1 to clear */
338 uint32_t regs_w1c[GEM_MAXREG];
339
340 /* PHY registers backing store */
341 uint16_t phy_regs[32];
342
343 uint8_t phy_loop; /* Are we in phy loopback? */
344
345 /* The current DMA descriptor pointers */
346 uint32_t rx_desc_addr;
347 uint32_t tx_desc_addr;
348
349 } GemState;
350
351 /* The broadcast MAC address: 0xFFFFFFFFFFFF */
352 const uint8_t broadcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
353
354 /*
355 * gem_init_register_masks:
356 * One time initialization.
357 * Set masks to identify which register bits have magical clear properties
358 */
359 static void gem_init_register_masks(GemState *s)
360 {
361 /* Mask of register bits which are read only*/
362 memset(&s->regs_ro[0], 0, sizeof(s->regs_ro));
363 s->regs_ro[GEM_NWCTRL] = 0xFFF80000;
364 s->regs_ro[GEM_NWSTATUS] = 0xFFFFFFFF;
365 s->regs_ro[GEM_DMACFG] = 0xFE00F000;
366 s->regs_ro[GEM_TXSTATUS] = 0xFFFFFE08;
367 s->regs_ro[GEM_RXQBASE] = 0x00000003;
368 s->regs_ro[GEM_TXQBASE] = 0x00000003;
369 s->regs_ro[GEM_RXSTATUS] = 0xFFFFFFF0;
370 s->regs_ro[GEM_ISR] = 0xFFFFFFFF;
371 s->regs_ro[GEM_IMR] = 0xFFFFFFFF;
372 s->regs_ro[GEM_MODID] = 0xFFFFFFFF;
373
374 /* Mask of register bits which are clear on read */
375 memset(&s->regs_rtc[0], 0, sizeof(s->regs_rtc));
376 s->regs_rtc[GEM_ISR] = 0xFFFFFFFF;
377
378 /* Mask of register bits which are write 1 to clear */
379 memset(&s->regs_w1c[0], 0, sizeof(s->regs_w1c));
380 s->regs_w1c[GEM_TXSTATUS] = 0x000001F7;
381 s->regs_w1c[GEM_RXSTATUS] = 0x0000000F;
382
383 /* Mask of register bits which are write only */
384 memset(&s->regs_wo[0], 0, sizeof(s->regs_wo));
385 s->regs_wo[GEM_NWCTRL] = 0x00073E60;
386 s->regs_wo[GEM_IER] = 0x07FFFFFF;
387 s->regs_wo[GEM_IDR] = 0x07FFFFFF;
388 }
389
390 /*
391 * phy_update_link:
392 * Make the emulated PHY link state match the QEMU "interface" state.
393 */
394 static void phy_update_link(GemState *s)
395 {
396 DB_PRINT("down %d\n", qemu_get_queue(s->nic)->link_down);
397
398 /* Autonegotiation status mirrors link status. */
399 if (qemu_get_queue(s->nic)->link_down) {
400 s->phy_regs[PHY_REG_STATUS] &= ~(PHY_REG_STATUS_ANEGCMPL |
401 PHY_REG_STATUS_LINK);
402 s->phy_regs[PHY_REG_INT_ST] |= PHY_REG_INT_ST_LINKC;
403 } else {
404 s->phy_regs[PHY_REG_STATUS] |= (PHY_REG_STATUS_ANEGCMPL |
405 PHY_REG_STATUS_LINK);
406 s->phy_regs[PHY_REG_INT_ST] |= (PHY_REG_INT_ST_LINKC |
407 PHY_REG_INT_ST_ANEGCMPL |
408 PHY_REG_INT_ST_ENERGY);
409 }
410 }
411
412 static int gem_can_receive(NetClientState *nc)
413 {
414 GemState *s;
415
416 s = qemu_get_nic_opaque(nc);
417
418 DB_PRINT("\n");
419
420 /* Do nothing if receive is not enabled. */
421 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) {
422 return 0;
423 }
424
425 return 1;
426 }
427
428 /*
429 * gem_update_int_status:
430 * Raise or lower interrupt based on current status.
431 */
432 static void gem_update_int_status(GemState *s)
433 {
434 if (s->regs[GEM_ISR]) {
435 DB_PRINT("asserting int. (0x%08x)\n", s->regs[GEM_ISR]);
436 qemu_set_irq(s->irq, 1);
437 }
438 }
439
440 /*
441 * gem_receive_updatestats:
442 * Increment receive statistics.
443 */
444 static void gem_receive_updatestats(GemState *s, const uint8_t *packet,
445 unsigned bytes)
446 {
447 uint64_t octets;
448
449 /* Total octets (bytes) received */
450 octets = ((uint64_t)(s->regs[GEM_OCTRXLO]) << 32) |
451 s->regs[GEM_OCTRXHI];
452 octets += bytes;
453 s->regs[GEM_OCTRXLO] = octets >> 32;
454 s->regs[GEM_OCTRXHI] = octets;
455
456 /* Error-free Frames received */
457 s->regs[GEM_RXCNT]++;
458
459 /* Error-free Broadcast Frames counter */
460 if (!memcmp(packet, broadcast_addr, 6)) {
461 s->regs[GEM_RXBROADCNT]++;
462 }
463
464 /* Error-free Multicast Frames counter */
465 if (packet[0] == 0x01) {
466 s->regs[GEM_RXMULTICNT]++;
467 }
468
469 if (bytes <= 64) {
470 s->regs[GEM_RX64CNT]++;
471 } else if (bytes <= 127) {
472 s->regs[GEM_RX65CNT]++;
473 } else if (bytes <= 255) {
474 s->regs[GEM_RX128CNT]++;
475 } else if (bytes <= 511) {
476 s->regs[GEM_RX256CNT]++;
477 } else if (bytes <= 1023) {
478 s->regs[GEM_RX512CNT]++;
479 } else if (bytes <= 1518) {
480 s->regs[GEM_RX1024CNT]++;
481 } else {
482 s->regs[GEM_RX1519CNT]++;
483 }
484 }
485
486 /*
487 * Get the MAC Address bit from the specified position
488 */
489 static unsigned get_bit(const uint8_t *mac, unsigned bit)
490 {
491 unsigned byte;
492
493 byte = mac[bit / 8];
494 byte >>= (bit & 0x7);
495 byte &= 1;
496
497 return byte;
498 }
499
500 /*
501 * Calculate a GEM MAC Address hash index
502 */
503 static unsigned calc_mac_hash(const uint8_t *mac)
504 {
505 int index_bit, mac_bit;
506 unsigned hash_index;
507
508 hash_index = 0;
509 mac_bit = 5;
510 for (index_bit = 5; index_bit >= 0; index_bit--) {
511 hash_index |= (get_bit(mac, mac_bit) ^
512 get_bit(mac, mac_bit + 6) ^
513 get_bit(mac, mac_bit + 12) ^
514 get_bit(mac, mac_bit + 18) ^
515 get_bit(mac, mac_bit + 24) ^
516 get_bit(mac, mac_bit + 30) ^
517 get_bit(mac, mac_bit + 36) ^
518 get_bit(mac, mac_bit + 42)) << index_bit;
519 mac_bit--;
520 }
521
522 return hash_index;
523 }
524
525 /*
526 * gem_mac_address_filter:
527 * Accept or reject this destination address?
528 * Returns:
529 * GEM_RX_REJECT: reject
530 * GEM_RX_ACCEPT: accept
531 */
532 static int gem_mac_address_filter(GemState *s, const uint8_t *packet)
533 {
534 uint8_t *gem_spaddr;
535 int i;
536
537 /* Promiscuous mode? */
538 if (s->regs[GEM_NWCFG] & GEM_NWCFG_PROMISC) {
539 return GEM_RX_ACCEPT;
540 }
541
542 if (!memcmp(packet, broadcast_addr, 6)) {
543 /* Reject broadcast packets? */
544 if (s->regs[GEM_NWCFG] & GEM_NWCFG_BCAST_REJ) {
545 return GEM_RX_REJECT;
546 }
547 return GEM_RX_ACCEPT;
548 }
549
550 /* Accept packets -w- hash match? */
551 if ((packet[0] == 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_MCAST_HASH)) ||
552 (packet[0] != 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_UCAST_HASH))) {
553 unsigned hash_index;
554
555 hash_index = calc_mac_hash(packet);
556 if (hash_index < 32) {
557 if (s->regs[GEM_HASHLO] & (1<<hash_index)) {
558 return GEM_RX_ACCEPT;
559 }
560 } else {
561 hash_index -= 32;
562 if (s->regs[GEM_HASHHI] & (1<<hash_index)) {
563 return GEM_RX_ACCEPT;
564 }
565 }
566 }
567
568 /* Check all 4 specific addresses */
569 gem_spaddr = (uint8_t *)&(s->regs[GEM_SPADDR1LO]);
570 for (i = 0; i < 4; i++) {
571 if (!memcmp(packet, gem_spaddr, 6)) {
572 return GEM_RX_ACCEPT;
573 }
574
575 gem_spaddr += 8;
576 }
577
578 /* No address match; reject the packet */
579 return GEM_RX_REJECT;
580 }
581
582 /*
583 * gem_receive:
584 * Fit a packet handed to us by QEMU into the receive descriptor ring.
585 */
586 static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
587 {
588 unsigned desc[2];
589 hwaddr packet_desc_addr, last_desc_addr;
590 GemState *s;
591 unsigned rxbufsize, bytes_to_copy;
592 unsigned rxbuf_offset;
593 uint8_t rxbuf[2048];
594 uint8_t *rxbuf_ptr;
595 bool first_desc = true;
596
597 s = qemu_get_nic_opaque(nc);
598
599 /* Do nothing if receive is not enabled. */
600 if (!gem_can_receive(nc)) {
601 return -1;
602 }
603
604 /* Is this destination MAC address "for us" ? */
605 if (gem_mac_address_filter(s, buf) == GEM_RX_REJECT) {
606 return -1;
607 }
608
609 /* Discard packets with receive length error enabled ? */
610 if (s->regs[GEM_NWCFG] & GEM_NWCFG_LERR_DISC) {
611 unsigned type_len;
612
613 /* Fish the ethertype / length field out of the RX packet */
614 type_len = buf[12] << 8 | buf[13];
615 /* It is a length field, not an ethertype */
616 if (type_len < 0x600) {
617 if (size < type_len) {
618 /* discard */
619 return -1;
620 }
621 }
622 }
623
624 /*
625 * Determine configured receive buffer offset (probably 0)
626 */
627 rxbuf_offset = (s->regs[GEM_NWCFG] & GEM_NWCFG_BUFF_OFST_M) >>
628 GEM_NWCFG_BUFF_OFST_S;
629
630 /* The configure size of each receive buffer. Determines how many
631 * buffers needed to hold this packet.
632 */
633 rxbufsize = ((s->regs[GEM_DMACFG] & GEM_DMACFG_RBUFSZ_M) >>
634 GEM_DMACFG_RBUFSZ_S) * GEM_DMACFG_RBUFSZ_MUL;
635 bytes_to_copy = size;
636
637 /* Strip of FCS field ? (usually yes) */
638 if (s->regs[GEM_NWCFG] & GEM_NWCFG_STRIP_FCS) {
639 rxbuf_ptr = (void *)buf;
640 } else {
641 unsigned crc_val;
642 int crc_offset;
643
644 /* The application wants the FCS field, which QEMU does not provide.
645 * We must try and caclculate one.
646 */
647
648 memcpy(rxbuf, buf, size);
649 memset(rxbuf + size, 0, sizeof(rxbuf) - size);
650 rxbuf_ptr = rxbuf;
651 crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
652 if (size < 60) {
653 crc_offset = 60;
654 } else {
655 crc_offset = size;
656 }
657 memcpy(rxbuf + crc_offset, &crc_val, sizeof(crc_val));
658
659 bytes_to_copy += 4;
660 size += 4;
661 }
662
663 /* Pad to minimum length */
664 if (size < 64) {
665 size = 64;
666 }
667
668 DB_PRINT("config bufsize: %d packet size: %ld\n", rxbufsize, size);
669
670 packet_desc_addr = s->rx_desc_addr;
671 while (1) {
672 DB_PRINT("read descriptor 0x%x\n", (unsigned)packet_desc_addr);
673 /* read current descriptor */
674 cpu_physical_memory_read(packet_desc_addr,
675 (uint8_t *)&desc[0], sizeof(desc));
676
677 /* Descriptor owned by software ? */
678 if (rx_desc_get_ownership(desc) == 1) {
679 DB_PRINT("descriptor 0x%x owned by sw.\n",
680 (unsigned)packet_desc_addr);
681 s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_NOBUF;
682 s->regs[GEM_ISR] |= GEM_INT_RXUSED & ~(s->regs[GEM_IMR]);
683 /* Handle interrupt consequences */
684 gem_update_int_status(s);
685 return -1;
686 }
687
688 DB_PRINT("copy %d bytes to 0x%x\n", MIN(bytes_to_copy, rxbufsize),
689 rx_desc_get_buffer(desc));
690
691 /*
692 * Let's have QEMU lend a helping hand.
693 */
694 if (rx_desc_get_buffer(desc) == 0) {
695 DB_PRINT("Invalid RX buffer (NULL) for descriptor 0x%x\n",
696 (unsigned)packet_desc_addr);
697 break;
698 }
699
700 /* Copy packet data to emulated DMA buffer */
701 cpu_physical_memory_write(rx_desc_get_buffer(desc) + rxbuf_offset,
702 rxbuf_ptr, MIN(bytes_to_copy, rxbufsize));
703 bytes_to_copy -= MIN(bytes_to_copy, rxbufsize);
704 rxbuf_ptr += MIN(bytes_to_copy, rxbufsize);
705
706 /* Update the descriptor. */
707 if (first_desc) {
708 rx_desc_set_sof(desc);
709 first_desc = false;
710 }
711 if (bytes_to_copy == 0) {
712 rx_desc_set_eof(desc);
713 rx_desc_set_length(desc, size);
714 }
715 rx_desc_set_ownership(desc);
716 /* Descriptor write-back. */
717 cpu_physical_memory_write(packet_desc_addr,
718 (uint8_t *)&desc[0], sizeof(desc));
719
720 if (bytes_to_copy == 0) {
721 break;
722 }
723
724 /* Next descriptor */
725 if (rx_desc_get_wrap(desc)) {
726 packet_desc_addr = s->regs[GEM_RXQBASE];
727 } else {
728 packet_desc_addr += 8;
729 }
730 }
731
732 DB_PRINT("set length: %ld, EOF on descriptor 0x%x\n", size,
733 (unsigned)packet_desc_addr);
734
735 /* Advance RX packet descriptor Q */
736 last_desc_addr = packet_desc_addr;
737 packet_desc_addr = s->rx_desc_addr;
738 s->rx_desc_addr = last_desc_addr;
739 if (rx_desc_get_wrap(desc)) {
740 s->rx_desc_addr = s->regs[GEM_RXQBASE];
741 DB_PRINT("wrapping RX descriptor list\n");
742 } else {
743 DB_PRINT("incrementing RX descriptor list\n");
744 s->rx_desc_addr += 8;
745 }
746
747 /* Count it */
748 gem_receive_updatestats(s, buf, size);
749
750 s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_FRMRCVD;
751 s->regs[GEM_ISR] |= GEM_INT_RXCMPL & ~(s->regs[GEM_IMR]);
752
753 /* Handle interrupt consequences */
754 gem_update_int_status(s);
755
756 return size;
757 }
758
759 /*
760 * gem_transmit_updatestats:
761 * Increment transmit statistics.
762 */
763 static void gem_transmit_updatestats(GemState *s, const uint8_t *packet,
764 unsigned bytes)
765 {
766 uint64_t octets;
767
768 /* Total octets (bytes) transmitted */
769 octets = ((uint64_t)(s->regs[GEM_OCTTXLO]) << 32) |
770 s->regs[GEM_OCTTXHI];
771 octets += bytes;
772 s->regs[GEM_OCTTXLO] = octets >> 32;
773 s->regs[GEM_OCTTXHI] = octets;
774
775 /* Error-free Frames transmitted */
776 s->regs[GEM_TXCNT]++;
777
778 /* Error-free Broadcast Frames counter */
779 if (!memcmp(packet, broadcast_addr, 6)) {
780 s->regs[GEM_TXBCNT]++;
781 }
782
783 /* Error-free Multicast Frames counter */
784 if (packet[0] == 0x01) {
785 s->regs[GEM_TXMCNT]++;
786 }
787
788 if (bytes <= 64) {
789 s->regs[GEM_TX64CNT]++;
790 } else if (bytes <= 127) {
791 s->regs[GEM_TX65CNT]++;
792 } else if (bytes <= 255) {
793 s->regs[GEM_TX128CNT]++;
794 } else if (bytes <= 511) {
795 s->regs[GEM_TX256CNT]++;
796 } else if (bytes <= 1023) {
797 s->regs[GEM_TX512CNT]++;
798 } else if (bytes <= 1518) {
799 s->regs[GEM_TX1024CNT]++;
800 } else {
801 s->regs[GEM_TX1519CNT]++;
802 }
803 }
804
805 /*
806 * gem_transmit:
807 * Fish packets out of the descriptor ring and feed them to QEMU
808 */
809 static void gem_transmit(GemState *s)
810 {
811 unsigned desc[2];
812 hwaddr packet_desc_addr;
813 uint8_t tx_packet[2048];
814 uint8_t *p;
815 unsigned total_bytes;
816
817 /* Do nothing if transmit is not enabled. */
818 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
819 return;
820 }
821
822 DB_PRINT("\n");
823
824 /* The packet we will hand off to qemu.
825 * Packets scattered across multiple descriptors are gathered to this
826 * one contiguous buffer first.
827 */
828 p = tx_packet;
829 total_bytes = 0;
830
831 /* read current descriptor */
832 packet_desc_addr = s->tx_desc_addr;
833 cpu_physical_memory_read(packet_desc_addr,
834 (uint8_t *)&desc[0], sizeof(desc));
835 /* Handle all descriptors owned by hardware */
836 while (tx_desc_get_used(desc) == 0) {
837
838 /* Do nothing if transmit is not enabled. */
839 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
840 return;
841 }
842 print_gem_tx_desc(desc);
843
844 /* The real hardware would eat this (and possibly crash).
845 * For QEMU let's lend a helping hand.
846 */
847 if ((tx_desc_get_buffer(desc) == 0) ||
848 (tx_desc_get_length(desc) == 0)) {
849 DB_PRINT("Invalid TX descriptor @ 0x%x\n",
850 (unsigned)packet_desc_addr);
851 break;
852 }
853
854 /* Gather this fragment of the packet from "dma memory" to our contig.
855 * buffer.
856 */
857 cpu_physical_memory_read(tx_desc_get_buffer(desc), p,
858 tx_desc_get_length(desc));
859 p += tx_desc_get_length(desc);
860 total_bytes += tx_desc_get_length(desc);
861
862 /* Last descriptor for this packet; hand the whole thing off */
863 if (tx_desc_get_last(desc)) {
864 /* Modify the 1st descriptor of this packet to be owned by
865 * the processor.
866 */
867 cpu_physical_memory_read(s->tx_desc_addr,
868 (uint8_t *)&desc[0], sizeof(desc));
869 tx_desc_set_used(desc);
870 cpu_physical_memory_write(s->tx_desc_addr,
871 (uint8_t *)&desc[0], sizeof(desc));
872 /* Advance the hardare current descriptor past this packet */
873 if (tx_desc_get_wrap(desc)) {
874 s->tx_desc_addr = s->regs[GEM_TXQBASE];
875 } else {
876 s->tx_desc_addr = packet_desc_addr + 8;
877 }
878 DB_PRINT("TX descriptor next: 0x%08x\n", s->tx_desc_addr);
879
880 s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_TXCMPL;
881 s->regs[GEM_ISR] |= GEM_INT_TXCMPL & ~(s->regs[GEM_IMR]);
882
883 /* Handle interrupt consequences */
884 gem_update_int_status(s);
885
886 /* Is checksum offload enabled? */
887 if (s->regs[GEM_DMACFG] & GEM_DMACFG_TXCSUM_OFFL) {
888 net_checksum_calculate(tx_packet, total_bytes);
889 }
890
891 /* Update MAC statistics */
892 gem_transmit_updatestats(s, tx_packet, total_bytes);
893
894 /* Send the packet somewhere */
895 if (s->phy_loop || (s->regs[GEM_NWCTRL] & GEM_NWCTRL_LOCALLOOP)) {
896 gem_receive(qemu_get_queue(s->nic), tx_packet, total_bytes);
897 } else {
898 qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
899 total_bytes);
900 }
901
902 /* Prepare for next packet */
903 p = tx_packet;
904 total_bytes = 0;
905 }
906
907 /* read next descriptor */
908 if (tx_desc_get_wrap(desc)) {
909 packet_desc_addr = s->regs[GEM_TXQBASE];
910 } else {
911 packet_desc_addr += 8;
912 }
913 cpu_physical_memory_read(packet_desc_addr,
914 (uint8_t *)&desc[0], sizeof(desc));
915 }
916
917 if (tx_desc_get_used(desc)) {
918 s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_USED;
919 s->regs[GEM_ISR] |= GEM_INT_TXUSED & ~(s->regs[GEM_IMR]);
920 gem_update_int_status(s);
921 }
922 }
923
924 static void gem_phy_reset(GemState *s)
925 {
926 memset(&s->phy_regs[0], 0, sizeof(s->phy_regs));
927 s->phy_regs[PHY_REG_CONTROL] = 0x1140;
928 s->phy_regs[PHY_REG_STATUS] = 0x7969;
929 s->phy_regs[PHY_REG_PHYID1] = 0x0141;
930 s->phy_regs[PHY_REG_PHYID2] = 0x0CC2;
931 s->phy_regs[PHY_REG_ANEGADV] = 0x01E1;
932 s->phy_regs[PHY_REG_LINKPABIL] = 0xCDE1;
933 s->phy_regs[PHY_REG_ANEGEXP] = 0x000F;
934 s->phy_regs[PHY_REG_NEXTP] = 0x2001;
935 s->phy_regs[PHY_REG_LINKPNEXTP] = 0x40E6;
936 s->phy_regs[PHY_REG_100BTCTRL] = 0x0300;
937 s->phy_regs[PHY_REG_1000BTSTAT] = 0x7C00;
938 s->phy_regs[PHY_REG_EXTSTAT] = 0x3000;
939 s->phy_regs[PHY_REG_PHYSPCFC_CTL] = 0x0078;
940 s->phy_regs[PHY_REG_PHYSPCFC_ST] = 0xBC00;
941 s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL] = 0x0C60;
942 s->phy_regs[PHY_REG_LED] = 0x4100;
943 s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL2] = 0x000A;
944 s->phy_regs[PHY_REG_EXT_PHYSPCFC_ST] = 0x848B;
945
946 phy_update_link(s);
947 }
948
949 static void gem_reset(DeviceState *d)
950 {
951 GemState *s = GEM(d);
952
953 DB_PRINT("\n");
954
955 /* Set post reset register values */
956 memset(&s->regs[0], 0, sizeof(s->regs));
957 s->regs[GEM_NWCFG] = 0x00080000;
958 s->regs[GEM_NWSTATUS] = 0x00000006;
959 s->regs[GEM_DMACFG] = 0x00020784;
960 s->regs[GEM_IMR] = 0x07ffffff;
961 s->regs[GEM_TXPAUSE] = 0x0000ffff;
962 s->regs[GEM_TXPARTIALSF] = 0x000003ff;
963 s->regs[GEM_RXPARTIALSF] = 0x000003ff;
964 s->regs[GEM_MODID] = 0x00020118;
965 s->regs[GEM_DESCONF] = 0x02500111;
966 s->regs[GEM_DESCONF2] = 0x2ab13fff;
967 s->regs[GEM_DESCONF5] = 0x002f2145;
968 s->regs[GEM_DESCONF6] = 0x00000200;
969
970 gem_phy_reset(s);
971
972 gem_update_int_status(s);
973 }
974
975 static uint16_t gem_phy_read(GemState *s, unsigned reg_num)
976 {
977 DB_PRINT("reg: %d value: 0x%04x\n", reg_num, s->phy_regs[reg_num]);
978 return s->phy_regs[reg_num];
979 }
980
981 static void gem_phy_write(GemState *s, unsigned reg_num, uint16_t val)
982 {
983 DB_PRINT("reg: %d value: 0x%04x\n", reg_num, val);
984
985 switch (reg_num) {
986 case PHY_REG_CONTROL:
987 if (val & PHY_REG_CONTROL_RST) {
988 /* Phy reset */
989 gem_phy_reset(s);
990 val &= ~(PHY_REG_CONTROL_RST | PHY_REG_CONTROL_LOOP);
991 s->phy_loop = 0;
992 }
993 if (val & PHY_REG_CONTROL_ANEG) {
994 /* Complete autonegotiation immediately */
995 val &= ~PHY_REG_CONTROL_ANEG;
996 s->phy_regs[PHY_REG_STATUS] |= PHY_REG_STATUS_ANEGCMPL;
997 }
998 if (val & PHY_REG_CONTROL_LOOP) {
999 DB_PRINT("PHY placed in loopback\n");
1000 s->phy_loop = 1;
1001 } else {
1002 s->phy_loop = 0;
1003 }
1004 break;
1005 }
1006 s->phy_regs[reg_num] = val;
1007 }
1008
1009 /*
1010 * gem_read32:
1011 * Read a GEM register.
1012 */
1013 static uint64_t gem_read(void *opaque, hwaddr offset, unsigned size)
1014 {
1015 GemState *s;
1016 uint32_t retval;
1017
1018 s = (GemState *)opaque;
1019
1020 offset >>= 2;
1021 retval = s->regs[offset];
1022
1023 DB_PRINT("offset: 0x%04x read: 0x%08x\n", (unsigned)offset*4, retval);
1024
1025 switch (offset) {
1026 case GEM_ISR:
1027 DB_PRINT("lowering irq on ISR read\n");
1028 qemu_set_irq(s->irq, 0);
1029 break;
1030 case GEM_PHYMNTNC:
1031 if (retval & GEM_PHYMNTNC_OP_R) {
1032 uint32_t phy_addr, reg_num;
1033
1034 phy_addr = (retval & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
1035 if (phy_addr == BOARD_PHY_ADDRESS) {
1036 reg_num = (retval & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
1037 retval &= 0xFFFF0000;
1038 retval |= gem_phy_read(s, reg_num);
1039 } else {
1040 retval |= 0xFFFF; /* No device at this address */
1041 }
1042 }
1043 break;
1044 }
1045
1046 /* Squash read to clear bits */
1047 s->regs[offset] &= ~(s->regs_rtc[offset]);
1048
1049 /* Do not provide write only bits */
1050 retval &= ~(s->regs_wo[offset]);
1051
1052 DB_PRINT("0x%08x\n", retval);
1053 return retval;
1054 }
1055
1056 /*
1057 * gem_write32:
1058 * Write a GEM register.
1059 */
1060 static void gem_write(void *opaque, hwaddr offset, uint64_t val,
1061 unsigned size)
1062 {
1063 GemState *s = (GemState *)opaque;
1064 uint32_t readonly;
1065
1066 DB_PRINT("offset: 0x%04x write: 0x%08x ", (unsigned)offset, (unsigned)val);
1067 offset >>= 2;
1068
1069 /* Squash bits which are read only in write value */
1070 val &= ~(s->regs_ro[offset]);
1071 /* Preserve (only) bits which are read only in register */
1072 readonly = s->regs[offset];
1073 readonly &= s->regs_ro[offset];
1074
1075 /* Squash bits which are write 1 to clear */
1076 val &= ~(s->regs_w1c[offset] & val);
1077
1078 /* Copy register write to backing store */
1079 s->regs[offset] = val | readonly;
1080
1081 /* Handle register write side effects */
1082 switch (offset) {
1083 case GEM_NWCTRL:
1084 if (val & GEM_NWCTRL_TXSTART) {
1085 gem_transmit(s);
1086 }
1087 if (!(val & GEM_NWCTRL_TXENA)) {
1088 /* Reset to start of Q when transmit disabled. */
1089 s->tx_desc_addr = s->regs[GEM_TXQBASE];
1090 }
1091 if (val & GEM_NWCTRL_RXENA) {
1092 qemu_flush_queued_packets(qemu_get_queue(s->nic));
1093 }
1094 break;
1095
1096 case GEM_TXSTATUS:
1097 gem_update_int_status(s);
1098 break;
1099 case GEM_RXQBASE:
1100 s->rx_desc_addr = val;
1101 break;
1102 case GEM_TXQBASE:
1103 s->tx_desc_addr = val;
1104 break;
1105 case GEM_RXSTATUS:
1106 gem_update_int_status(s);
1107 break;
1108 case GEM_IER:
1109 s->regs[GEM_IMR] &= ~val;
1110 gem_update_int_status(s);
1111 break;
1112 case GEM_IDR:
1113 s->regs[GEM_IMR] |= val;
1114 gem_update_int_status(s);
1115 break;
1116 case GEM_PHYMNTNC:
1117 if (val & GEM_PHYMNTNC_OP_W) {
1118 uint32_t phy_addr, reg_num;
1119
1120 phy_addr = (val & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
1121 if (phy_addr == BOARD_PHY_ADDRESS) {
1122 reg_num = (val & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
1123 gem_phy_write(s, reg_num, val);
1124 }
1125 }
1126 break;
1127 }
1128
1129 DB_PRINT("newval: 0x%08x\n", s->regs[offset]);
1130 }
1131
1132 static const MemoryRegionOps gem_ops = {
1133 .read = gem_read,
1134 .write = gem_write,
1135 .endianness = DEVICE_LITTLE_ENDIAN,
1136 };
1137
1138 static void gem_cleanup(NetClientState *nc)
1139 {
1140 GemState *s = qemu_get_nic_opaque(nc);
1141
1142 DB_PRINT("\n");
1143 s->nic = NULL;
1144 }
1145
1146 static void gem_set_link(NetClientState *nc)
1147 {
1148 DB_PRINT("\n");
1149 phy_update_link(qemu_get_nic_opaque(nc));
1150 }
1151
1152 static NetClientInfo net_gem_info = {
1153 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1154 .size = sizeof(NICState),
1155 .can_receive = gem_can_receive,
1156 .receive = gem_receive,
1157 .cleanup = gem_cleanup,
1158 .link_status_changed = gem_set_link,
1159 };
1160
1161 static int gem_init(SysBusDevice *sbd)
1162 {
1163 DeviceState *dev = DEVICE(sbd);
1164 GemState *s = GEM(dev);
1165
1166 DB_PRINT("\n");
1167
1168 gem_init_register_masks(s);
1169 memory_region_init_io(&s->iomem, OBJECT(s), &gem_ops, s,
1170 "enet", sizeof(s->regs));
1171 sysbus_init_mmio(sbd, &s->iomem);
1172 sysbus_init_irq(sbd, &s->irq);
1173 qemu_macaddr_default_if_unset(&s->conf.macaddr);
1174
1175 s->nic = qemu_new_nic(&net_gem_info, &s->conf,
1176 object_get_typename(OBJECT(dev)), dev->id, s);
1177
1178 return 0;
1179 }
1180
1181 static const VMStateDescription vmstate_cadence_gem = {
1182 .name = "cadence_gem",
1183 .version_id = 1,
1184 .minimum_version_id = 1,
1185 .minimum_version_id_old = 1,
1186 .fields = (VMStateField[]) {
1187 VMSTATE_UINT32_ARRAY(regs, GemState, GEM_MAXREG),
1188 VMSTATE_UINT16_ARRAY(phy_regs, GemState, 32),
1189 VMSTATE_UINT8(phy_loop, GemState),
1190 VMSTATE_UINT32(rx_desc_addr, GemState),
1191 VMSTATE_UINT32(tx_desc_addr, GemState),
1192 }
1193 };
1194
1195 static Property gem_properties[] = {
1196 DEFINE_NIC_PROPERTIES(GemState, conf),
1197 DEFINE_PROP_END_OF_LIST(),
1198 };
1199
1200 static void gem_class_init(ObjectClass *klass, void *data)
1201 {
1202 DeviceClass *dc = DEVICE_CLASS(klass);
1203 SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
1204
1205 sdc->init = gem_init;
1206 dc->props = gem_properties;
1207 dc->vmsd = &vmstate_cadence_gem;
1208 dc->reset = gem_reset;
1209 }
1210
1211 static const TypeInfo gem_info = {
1212 .name = TYPE_CADENCE_GEM,
1213 .parent = TYPE_SYS_BUS_DEVICE,
1214 .instance_size = sizeof(GemState),
1215 .class_init = gem_class_init,
1216 };
1217
1218 static void gem_register_types(void)
1219 {
1220 type_register_static(&gem_info);
1221 }
1222
1223 type_init(gem_register_types)
QEmu