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usb-bot: hotplug support
[qemu/kevin.git] / hw / net / cadence_gem.c
blob0346f3e3354ffb7aa7ec6df033b09c99916614bf
1 /*
2 * QEMU Cadence 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 "qemu/osdep.h"
26 #include <zlib.h> /* For crc32 */
27
28 #include "hw/net/cadence_gem.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 Maintenance 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 /*****************************************/
145 #define GEM_NWCTRL_TXSTART 0x00000200 /* Transmit Enable */
146 #define GEM_NWCTRL_TXENA 0x00000008 /* Transmit Enable */
147 #define GEM_NWCTRL_RXENA 0x00000004 /* Receive Enable */
148 #define GEM_NWCTRL_LOCALLOOP 0x00000002 /* Local Loopback */
149
150 #define GEM_NWCFG_STRIP_FCS 0x00020000 /* Strip FCS field */
151 #define GEM_NWCFG_LERR_DISC 0x00010000 /* Discard RX frames with len err */
152 #define GEM_NWCFG_BUFF_OFST_M 0x0000C000 /* Receive buffer offset mask */
153 #define GEM_NWCFG_BUFF_OFST_S 14 /* Receive buffer offset shift */
154 #define GEM_NWCFG_UCAST_HASH 0x00000080 /* accept unicast if hash match */
155 #define GEM_NWCFG_MCAST_HASH 0x00000040 /* accept multicast if hash match */
156 #define GEM_NWCFG_BCAST_REJ 0x00000020 /* Reject broadcast packets */
157 #define GEM_NWCFG_PROMISC 0x00000010 /* Accept all packets */
158
159 #define GEM_DMACFG_RBUFSZ_M 0x00FF0000 /* DMA RX Buffer Size mask */
160 #define GEM_DMACFG_RBUFSZ_S 16 /* DMA RX Buffer Size shift */
161 #define GEM_DMACFG_RBUFSZ_MUL 64 /* DMA RX Buffer Size multiplier */
162 #define GEM_DMACFG_TXCSUM_OFFL 0x00000800 /* Transmit checksum offload */
163
164 #define GEM_TXSTATUS_TXCMPL 0x00000020 /* Transmit Complete */
165 #define GEM_TXSTATUS_USED 0x00000001 /* sw owned descriptor encountered */
166
167 #define GEM_RXSTATUS_FRMRCVD 0x00000002 /* Frame received */
168 #define GEM_RXSTATUS_NOBUF 0x00000001 /* Buffer unavailable */
169
170 /* GEM_ISR GEM_IER GEM_IDR GEM_IMR */
171 #define GEM_INT_TXCMPL 0x00000080 /* Transmit Complete */
172 #define GEM_INT_TXUSED 0x00000008
173 #define GEM_INT_RXUSED 0x00000004
174 #define GEM_INT_RXCMPL 0x00000002
175
176 #define GEM_PHYMNTNC_OP_R 0x20000000 /* read operation */
177 #define GEM_PHYMNTNC_OP_W 0x10000000 /* write operation */
178 #define GEM_PHYMNTNC_ADDR 0x0F800000 /* Address bits */
179 #define GEM_PHYMNTNC_ADDR_SHFT 23
180 #define GEM_PHYMNTNC_REG 0x007C0000 /* register bits */
181 #define GEM_PHYMNTNC_REG_SHIFT 18
182
183 /* Marvell PHY definitions */
184 #define BOARD_PHY_ADDRESS 23 /* PHY address we will emulate a device at */
185
186 #define PHY_REG_CONTROL 0
187 #define PHY_REG_STATUS 1
188 #define PHY_REG_PHYID1 2
189 #define PHY_REG_PHYID2 3
190 #define PHY_REG_ANEGADV 4
191 #define PHY_REG_LINKPABIL 5
192 #define PHY_REG_ANEGEXP 6
193 #define PHY_REG_NEXTP 7
194 #define PHY_REG_LINKPNEXTP 8
195 #define PHY_REG_100BTCTRL 9
196 #define PHY_REG_1000BTSTAT 10
197 #define PHY_REG_EXTSTAT 15
198 #define PHY_REG_PHYSPCFC_CTL 16
199 #define PHY_REG_PHYSPCFC_ST 17
200 #define PHY_REG_INT_EN 18
201 #define PHY_REG_INT_ST 19
202 #define PHY_REG_EXT_PHYSPCFC_CTL 20
203 #define PHY_REG_RXERR 21
204 #define PHY_REG_EACD 22
205 #define PHY_REG_LED 24
206 #define PHY_REG_LED_OVRD 25
207 #define PHY_REG_EXT_PHYSPCFC_CTL2 26
208 #define PHY_REG_EXT_PHYSPCFC_ST 27
209 #define PHY_REG_CABLE_DIAG 28
210
211 #define PHY_REG_CONTROL_RST 0x8000
212 #define PHY_REG_CONTROL_LOOP 0x4000
213 #define PHY_REG_CONTROL_ANEG 0x1000
214
215 #define PHY_REG_STATUS_LINK 0x0004
216 #define PHY_REG_STATUS_ANEGCMPL 0x0020
217
218 #define PHY_REG_INT_ST_ANEGCMPL 0x0800
219 #define PHY_REG_INT_ST_LINKC 0x0400
220 #define PHY_REG_INT_ST_ENERGY 0x0010
221
222 /***********************************************************************/
223 #define GEM_RX_REJECT (-1)
224 #define GEM_RX_PROMISCUOUS_ACCEPT (-2)
225 #define GEM_RX_BROADCAST_ACCEPT (-3)
226 #define GEM_RX_MULTICAST_HASH_ACCEPT (-4)
227 #define GEM_RX_UNICAST_HASH_ACCEPT (-5)
228
229 #define GEM_RX_SAR_ACCEPT 0
230
231 /***********************************************************************/
232
233 #define DESC_1_USED 0x80000000
234 #define DESC_1_LENGTH 0x00001FFF
235
236 #define DESC_1_TX_WRAP 0x40000000
237 #define DESC_1_TX_LAST 0x00008000
238
239 #define DESC_0_RX_WRAP 0x00000002
240 #define DESC_0_RX_OWNERSHIP 0x00000001
241
242 #define R_DESC_1_RX_SAR_SHIFT 25
243 #define R_DESC_1_RX_SAR_LENGTH 2
244 #define R_DESC_1_RX_SAR_MATCH (1 << 27)
245 #define R_DESC_1_RX_UNICAST_HASH (1 << 29)
246 #define R_DESC_1_RX_MULTICAST_HASH (1 << 30)
247 #define R_DESC_1_RX_BROADCAST (1 << 31)
248
249 #define DESC_1_RX_SOF 0x00004000
250 #define DESC_1_RX_EOF 0x00008000
251
252 static inline unsigned tx_desc_get_buffer(unsigned *desc)
253 {
254 return desc[0];
255 }
256
257 static inline unsigned tx_desc_get_used(unsigned *desc)
258 {
259 return (desc[1] & DESC_1_USED) ? 1 : 0;
260 }
261
262 static inline void tx_desc_set_used(unsigned *desc)
263 {
264 desc[1] |= DESC_1_USED;
265 }
266
267 static inline unsigned tx_desc_get_wrap(unsigned *desc)
268 {
269 return (desc[1] & DESC_1_TX_WRAP) ? 1 : 0;
270 }
271
272 static inline unsigned tx_desc_get_last(unsigned *desc)
273 {
274 return (desc[1] & DESC_1_TX_LAST) ? 1 : 0;
275 }
276
277 static inline unsigned tx_desc_get_length(unsigned *desc)
278 {
279 return desc[1] & DESC_1_LENGTH;
280 }
281
282 static inline void print_gem_tx_desc(unsigned *desc)
283 {
284 DB_PRINT("TXDESC:\n");
285 DB_PRINT("bufaddr: 0x%08x\n", *desc);
286 DB_PRINT("used_hw: %d\n", tx_desc_get_used(desc));
287 DB_PRINT("wrap: %d\n", tx_desc_get_wrap(desc));
288 DB_PRINT("last: %d\n", tx_desc_get_last(desc));
289 DB_PRINT("length: %d\n", tx_desc_get_length(desc));
290 }
291
292 static inline unsigned rx_desc_get_buffer(unsigned *desc)
293 {
294 return desc[0] & ~0x3UL;
295 }
296
297 static inline unsigned rx_desc_get_wrap(unsigned *desc)
298 {
299 return desc[0] & DESC_0_RX_WRAP ? 1 : 0;
300 }
301
302 static inline unsigned rx_desc_get_ownership(unsigned *desc)
303 {
304 return desc[0] & DESC_0_RX_OWNERSHIP ? 1 : 0;
305 }
306
307 static inline void rx_desc_set_ownership(unsigned *desc)
308 {
309 desc[0] |= DESC_0_RX_OWNERSHIP;
310 }
311
312 static inline void rx_desc_set_sof(unsigned *desc)
313 {
314 desc[1] |= DESC_1_RX_SOF;
315 }
316
317 static inline void rx_desc_set_eof(unsigned *desc)
318 {
319 desc[1] |= DESC_1_RX_EOF;
320 }
321
322 static inline void rx_desc_set_length(unsigned *desc, unsigned len)
323 {
324 desc[1] &= ~DESC_1_LENGTH;
325 desc[1] |= len;
326 }
327
328 static inline void rx_desc_set_broadcast(unsigned *desc)
329 {
330 desc[1] |= R_DESC_1_RX_BROADCAST;
331 }
332
333 static inline void rx_desc_set_unicast_hash(unsigned *desc)
334 {
335 desc[1] |= R_DESC_1_RX_UNICAST_HASH;
336 }
337
338 static inline void rx_desc_set_multicast_hash(unsigned *desc)
339 {
340 desc[1] |= R_DESC_1_RX_MULTICAST_HASH;
341 }
342
343 static inline void rx_desc_set_sar(unsigned *desc, int sar_idx)
344 {
345 desc[1] = deposit32(desc[1], R_DESC_1_RX_SAR_SHIFT, R_DESC_1_RX_SAR_LENGTH,
346 sar_idx);
347 desc[1] |= R_DESC_1_RX_SAR_MATCH;
348 }
349
350 /* The broadcast MAC address: 0xFFFFFFFFFFFF */
351 static const uint8_t broadcast_addr[] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
352
353 /*
354 * gem_init_register_masks:
355 * One time initialization.
356 * Set masks to identify which register bits have magical clear properties
357 */
358 static void gem_init_register_masks(CadenceGEMState *s)
359 {
360 /* Mask of register bits which are read only */
361 memset(&s->regs_ro[0], 0, sizeof(s->regs_ro));
362 s->regs_ro[GEM_NWCTRL] = 0xFFF80000;
363 s->regs_ro[GEM_NWSTATUS] = 0xFFFFFFFF;
364 s->regs_ro[GEM_DMACFG] = 0xFE00F000;
365 s->regs_ro[GEM_TXSTATUS] = 0xFFFFFE08;
366 s->regs_ro[GEM_RXQBASE] = 0x00000003;
367 s->regs_ro[GEM_TXQBASE] = 0x00000003;
368 s->regs_ro[GEM_RXSTATUS] = 0xFFFFFFF0;
369 s->regs_ro[GEM_ISR] = 0xFFFFFFFF;
370 s->regs_ro[GEM_IMR] = 0xFFFFFFFF;
371 s->regs_ro[GEM_MODID] = 0xFFFFFFFF;
372
373 /* Mask of register bits which are clear on read */
374 memset(&s->regs_rtc[0], 0, sizeof(s->regs_rtc));
375 s->regs_rtc[GEM_ISR] = 0xFFFFFFFF;
376
377 /* Mask of register bits which are write 1 to clear */
378 memset(&s->regs_w1c[0], 0, sizeof(s->regs_w1c));
379 s->regs_w1c[GEM_TXSTATUS] = 0x000001F7;
380 s->regs_w1c[GEM_RXSTATUS] = 0x0000000F;
381
382 /* Mask of register bits which are write only */
383 memset(&s->regs_wo[0], 0, sizeof(s->regs_wo));
384 s->regs_wo[GEM_NWCTRL] = 0x00073E60;
385 s->regs_wo[GEM_IER] = 0x07FFFFFF;
386 s->regs_wo[GEM_IDR] = 0x07FFFFFF;
387 }
388
389 /*
390 * phy_update_link:
391 * Make the emulated PHY link state match the QEMU "interface" state.
392 */
393 static void phy_update_link(CadenceGEMState *s)
394 {
395 DB_PRINT("down %d\n", qemu_get_queue(s->nic)->link_down);
396
397 /* Autonegotiation status mirrors link status. */
398 if (qemu_get_queue(s->nic)->link_down) {
399 s->phy_regs[PHY_REG_STATUS] &= ~(PHY_REG_STATUS_ANEGCMPL |
400 PHY_REG_STATUS_LINK);
401 s->phy_regs[PHY_REG_INT_ST] |= PHY_REG_INT_ST_LINKC;
402 } else {
403 s->phy_regs[PHY_REG_STATUS] |= (PHY_REG_STATUS_ANEGCMPL |
404 PHY_REG_STATUS_LINK);
405 s->phy_regs[PHY_REG_INT_ST] |= (PHY_REG_INT_ST_LINKC |
406 PHY_REG_INT_ST_ANEGCMPL |
407 PHY_REG_INT_ST_ENERGY);
408 }
409 }
410
411 static int gem_can_receive(NetClientState *nc)
412 {
413 CadenceGEMState *s;
414
415 s = qemu_get_nic_opaque(nc);
416
417 /* Do nothing if receive is not enabled. */
418 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_RXENA)) {
419 if (s->can_rx_state != 1) {
420 s->can_rx_state = 1;
421 DB_PRINT("can't receive - no enable\n");
422 }
423 return 0;
424 }
425
426 if (rx_desc_get_ownership(s->rx_desc) == 1) {
427 if (s->can_rx_state != 2) {
428 s->can_rx_state = 2;
429 DB_PRINT("can't receive - busy buffer descriptor 0x%x\n",
430 s->rx_desc_addr);
431 }
432 return 0;
433 }
434
435 if (s->can_rx_state != 0) {
436 s->can_rx_state = 0;
437 DB_PRINT("can receive 0x%x\n", s->rx_desc_addr);
438 }
439 return 1;
440 }
441
442 /*
443 * gem_update_int_status:
444 * Raise or lower interrupt based on current status.
445 */
446 static void gem_update_int_status(CadenceGEMState *s)
447 {
448 if (s->regs[GEM_ISR]) {
449 DB_PRINT("asserting int. (0x%08x)\n", s->regs[GEM_ISR]);
450 qemu_set_irq(s->irq, 1);
451 }
452 }
453
454 /*
455 * gem_receive_updatestats:
456 * Increment receive statistics.
457 */
458 static void gem_receive_updatestats(CadenceGEMState *s, const uint8_t *packet,
459 unsigned bytes)
460 {
461 uint64_t octets;
462
463 /* Total octets (bytes) received */
464 octets = ((uint64_t)(s->regs[GEM_OCTRXLO]) << 32) |
465 s->regs[GEM_OCTRXHI];
466 octets += bytes;
467 s->regs[GEM_OCTRXLO] = octets >> 32;
468 s->regs[GEM_OCTRXHI] = octets;
469
470 /* Error-free Frames received */
471 s->regs[GEM_RXCNT]++;
472
473 /* Error-free Broadcast Frames counter */
474 if (!memcmp(packet, broadcast_addr, 6)) {
475 s->regs[GEM_RXBROADCNT]++;
476 }
477
478 /* Error-free Multicast Frames counter */
479 if (packet[0] == 0x01) {
480 s->regs[GEM_RXMULTICNT]++;
481 }
482
483 if (bytes <= 64) {
484 s->regs[GEM_RX64CNT]++;
485 } else if (bytes <= 127) {
486 s->regs[GEM_RX65CNT]++;
487 } else if (bytes <= 255) {
488 s->regs[GEM_RX128CNT]++;
489 } else if (bytes <= 511) {
490 s->regs[GEM_RX256CNT]++;
491 } else if (bytes <= 1023) {
492 s->regs[GEM_RX512CNT]++;
493 } else if (bytes <= 1518) {
494 s->regs[GEM_RX1024CNT]++;
495 } else {
496 s->regs[GEM_RX1519CNT]++;
497 }
498 }
499
500 /*
501 * Get the MAC Address bit from the specified position
502 */
503 static unsigned get_bit(const uint8_t *mac, unsigned bit)
504 {
505 unsigned byte;
506
507 byte = mac[bit / 8];
508 byte >>= (bit & 0x7);
509 byte &= 1;
510
511 return byte;
512 }
513
514 /*
515 * Calculate a GEM MAC Address hash index
516 */
517 static unsigned calc_mac_hash(const uint8_t *mac)
518 {
519 int index_bit, mac_bit;
520 unsigned hash_index;
521
522 hash_index = 0;
523 mac_bit = 5;
524 for (index_bit = 5; index_bit >= 0; index_bit--) {
525 hash_index |= (get_bit(mac, mac_bit) ^
526 get_bit(mac, mac_bit + 6) ^
527 get_bit(mac, mac_bit + 12) ^
528 get_bit(mac, mac_bit + 18) ^
529 get_bit(mac, mac_bit + 24) ^
530 get_bit(mac, mac_bit + 30) ^
531 get_bit(mac, mac_bit + 36) ^
532 get_bit(mac, mac_bit + 42)) << index_bit;
533 mac_bit--;
534 }
535
536 return hash_index;
537 }
538
539 /*
540 * gem_mac_address_filter:
541 * Accept or reject this destination address?
542 * Returns:
543 * GEM_RX_REJECT: reject
544 * >= 0: Specific address accept (which matched SAR is returned)
545 * others for various other modes of accept:
546 * GEM_RM_PROMISCUOUS_ACCEPT, GEM_RX_BROADCAST_ACCEPT,
547 * GEM_RX_MULTICAST_HASH_ACCEPT or GEM_RX_UNICAST_HASH_ACCEPT
548 */
549 static int gem_mac_address_filter(CadenceGEMState *s, const uint8_t *packet)
550 {
551 uint8_t *gem_spaddr;
552 int i;
553
554 /* Promiscuous mode? */
555 if (s->regs[GEM_NWCFG] & GEM_NWCFG_PROMISC) {
556 return GEM_RX_PROMISCUOUS_ACCEPT;
557 }
558
559 if (!memcmp(packet, broadcast_addr, 6)) {
560 /* Reject broadcast packets? */
561 if (s->regs[GEM_NWCFG] & GEM_NWCFG_BCAST_REJ) {
562 return GEM_RX_REJECT;
563 }
564 return GEM_RX_BROADCAST_ACCEPT;
565 }
566
567 /* Accept packets -w- hash match? */
568 if ((packet[0] == 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_MCAST_HASH)) ||
569 (packet[0] != 0x01 && (s->regs[GEM_NWCFG] & GEM_NWCFG_UCAST_HASH))) {
570 unsigned hash_index;
571
572 hash_index = calc_mac_hash(packet);
573 if (hash_index < 32) {
574 if (s->regs[GEM_HASHLO] & (1<<hash_index)) {
575 return packet[0] == 0x01 ? GEM_RX_MULTICAST_HASH_ACCEPT :
576 GEM_RX_UNICAST_HASH_ACCEPT;
577 }
578 } else {
579 hash_index -= 32;
580 if (s->regs[GEM_HASHHI] & (1<<hash_index)) {
581 return packet[0] == 0x01 ? GEM_RX_MULTICAST_HASH_ACCEPT :
582 GEM_RX_UNICAST_HASH_ACCEPT;
583 }
584 }
585 }
586
587 /* Check all 4 specific addresses */
588 gem_spaddr = (uint8_t *)&(s->regs[GEM_SPADDR1LO]);
589 for (i = 3; i >= 0; i--) {
590 if (s->sar_active[i] && !memcmp(packet, gem_spaddr + 8 * i, 6)) {
591 return GEM_RX_SAR_ACCEPT + i;
592 }
593 }
594
595 /* No address match; reject the packet */
596 return GEM_RX_REJECT;
597 }
598
599 static void gem_get_rx_desc(CadenceGEMState *s)
600 {
601 DB_PRINT("read descriptor 0x%x\n", (unsigned)s->rx_desc_addr);
602 /* read current descriptor */
603 cpu_physical_memory_read(s->rx_desc_addr,
604 (uint8_t *)s->rx_desc, sizeof(s->rx_desc));
605
606 /* Descriptor owned by software ? */
607 if (rx_desc_get_ownership(s->rx_desc) == 1) {
608 DB_PRINT("descriptor 0x%x owned by sw.\n",
609 (unsigned)s->rx_desc_addr);
610 s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_NOBUF;
611 s->regs[GEM_ISR] |= GEM_INT_RXUSED & ~(s->regs[GEM_IMR]);
612 /* Handle interrupt consequences */
613 gem_update_int_status(s);
614 }
615 }
616
617 /*
618 * gem_receive:
619 * Fit a packet handed to us by QEMU into the receive descriptor ring.
620 */
621 static ssize_t gem_receive(NetClientState *nc, const uint8_t *buf, size_t size)
622 {
623 CadenceGEMState *s;
624 unsigned rxbufsize, bytes_to_copy;
625 unsigned rxbuf_offset;
626 uint8_t rxbuf[2048];
627 uint8_t *rxbuf_ptr;
628 bool first_desc = true;
629 int maf;
630
631 s = qemu_get_nic_opaque(nc);
632
633 /* Is this destination MAC address "for us" ? */
634 maf = gem_mac_address_filter(s, buf);
635 if (maf == GEM_RX_REJECT) {
636 return -1;
637 }
638
639 /* Discard packets with receive length error enabled ? */
640 if (s->regs[GEM_NWCFG] & GEM_NWCFG_LERR_DISC) {
641 unsigned type_len;
642
643 /* Fish the ethertype / length field out of the RX packet */
644 type_len = buf[12] << 8 | buf[13];
645 /* It is a length field, not an ethertype */
646 if (type_len < 0x600) {
647 if (size < type_len) {
648 /* discard */
649 return -1;
650 }
651 }
652 }
653
654 /*
655 * Determine configured receive buffer offset (probably 0)
656 */
657 rxbuf_offset = (s->regs[GEM_NWCFG] & GEM_NWCFG_BUFF_OFST_M) >>
658 GEM_NWCFG_BUFF_OFST_S;
659
660 /* The configure size of each receive buffer. Determines how many
661 * buffers needed to hold this packet.
662 */
663 rxbufsize = ((s->regs[GEM_DMACFG] & GEM_DMACFG_RBUFSZ_M) >>
664 GEM_DMACFG_RBUFSZ_S) * GEM_DMACFG_RBUFSZ_MUL;
665 bytes_to_copy = size;
666
667 /* Pad to minimum length. Assume FCS field is stripped, logic
668 * below will increment it to the real minimum of 64 when
669 * not FCS stripping
670 */
671 if (size < 60) {
672 size = 60;
673 }
674
675 /* Strip of FCS field ? (usually yes) */
676 if (s->regs[GEM_NWCFG] & GEM_NWCFG_STRIP_FCS) {
677 rxbuf_ptr = (void *)buf;
678 } else {
679 unsigned crc_val;
680
681 if (size > sizeof(rxbuf) - sizeof(crc_val)) {
682 size = sizeof(rxbuf) - sizeof(crc_val);
683 }
684 bytes_to_copy = size;
685 /* The application wants the FCS field, which QEMU does not provide.
686 * We must try and calculate one.
687 */
688
689 memcpy(rxbuf, buf, size);
690 memset(rxbuf + size, 0, sizeof(rxbuf) - size);
691 rxbuf_ptr = rxbuf;
692 crc_val = cpu_to_le32(crc32(0, rxbuf, MAX(size, 60)));
693 memcpy(rxbuf + size, &crc_val, sizeof(crc_val));
694
695 bytes_to_copy += 4;
696 size += 4;
697 }
698
699 DB_PRINT("config bufsize: %d packet size: %ld\n", rxbufsize, size);
700
701 while (bytes_to_copy) {
702 /* Do nothing if receive is not enabled. */
703 if (!gem_can_receive(nc)) {
704 assert(!first_desc);
705 return -1;
706 }
707
708 DB_PRINT("copy %d bytes to 0x%x\n", MIN(bytes_to_copy, rxbufsize),
709 rx_desc_get_buffer(s->rx_desc));
710
711 /* Copy packet data to emulated DMA buffer */
712 cpu_physical_memory_write(rx_desc_get_buffer(s->rx_desc) + rxbuf_offset,
713 rxbuf_ptr, MIN(bytes_to_copy, rxbufsize));
714 rxbuf_ptr += MIN(bytes_to_copy, rxbufsize);
715 bytes_to_copy -= MIN(bytes_to_copy, rxbufsize);
716
717 /* Update the descriptor. */
718 if (first_desc) {
719 rx_desc_set_sof(s->rx_desc);
720 first_desc = false;
721 }
722 if (bytes_to_copy == 0) {
723 rx_desc_set_eof(s->rx_desc);
724 rx_desc_set_length(s->rx_desc, size);
725 }
726 rx_desc_set_ownership(s->rx_desc);
727
728 switch (maf) {
729 case GEM_RX_PROMISCUOUS_ACCEPT:
730 break;
731 case GEM_RX_BROADCAST_ACCEPT:
732 rx_desc_set_broadcast(s->rx_desc);
733 break;
734 case GEM_RX_UNICAST_HASH_ACCEPT:
735 rx_desc_set_unicast_hash(s->rx_desc);
736 break;
737 case GEM_RX_MULTICAST_HASH_ACCEPT:
738 rx_desc_set_multicast_hash(s->rx_desc);
739 break;
740 case GEM_RX_REJECT:
741 abort();
742 default: /* SAR */
743 rx_desc_set_sar(s->rx_desc, maf);
744 }
745
746 /* Descriptor write-back. */
747 cpu_physical_memory_write(s->rx_desc_addr,
748 (uint8_t *)s->rx_desc, sizeof(s->rx_desc));
749
750 /* Next descriptor */
751 if (rx_desc_get_wrap(s->rx_desc)) {
752 DB_PRINT("wrapping RX descriptor list\n");
753 s->rx_desc_addr = s->regs[GEM_RXQBASE];
754 } else {
755 DB_PRINT("incrementing RX descriptor list\n");
756 s->rx_desc_addr += 8;
757 }
758 gem_get_rx_desc(s);
759 }
760
761 /* Count it */
762 gem_receive_updatestats(s, buf, size);
763
764 s->regs[GEM_RXSTATUS] |= GEM_RXSTATUS_FRMRCVD;
765 s->regs[GEM_ISR] |= GEM_INT_RXCMPL & ~(s->regs[GEM_IMR]);
766
767 /* Handle interrupt consequences */
768 gem_update_int_status(s);
769
770 return size;
771 }
772
773 /*
774 * gem_transmit_updatestats:
775 * Increment transmit statistics.
776 */
777 static void gem_transmit_updatestats(CadenceGEMState *s, const uint8_t *packet,
778 unsigned bytes)
779 {
780 uint64_t octets;
781
782 /* Total octets (bytes) transmitted */
783 octets = ((uint64_t)(s->regs[GEM_OCTTXLO]) << 32) |
784 s->regs[GEM_OCTTXHI];
785 octets += bytes;
786 s->regs[GEM_OCTTXLO] = octets >> 32;
787 s->regs[GEM_OCTTXHI] = octets;
788
789 /* Error-free Frames transmitted */
790 s->regs[GEM_TXCNT]++;
791
792 /* Error-free Broadcast Frames counter */
793 if (!memcmp(packet, broadcast_addr, 6)) {
794 s->regs[GEM_TXBCNT]++;
795 }
796
797 /* Error-free Multicast Frames counter */
798 if (packet[0] == 0x01) {
799 s->regs[GEM_TXMCNT]++;
800 }
801
802 if (bytes <= 64) {
803 s->regs[GEM_TX64CNT]++;
804 } else if (bytes <= 127) {
805 s->regs[GEM_TX65CNT]++;
806 } else if (bytes <= 255) {
807 s->regs[GEM_TX128CNT]++;
808 } else if (bytes <= 511) {
809 s->regs[GEM_TX256CNT]++;
810 } else if (bytes <= 1023) {
811 s->regs[GEM_TX512CNT]++;
812 } else if (bytes <= 1518) {
813 s->regs[GEM_TX1024CNT]++;
814 } else {
815 s->regs[GEM_TX1519CNT]++;
816 }
817 }
818
819 /*
820 * gem_transmit:
821 * Fish packets out of the descriptor ring and feed them to QEMU
822 */
823 static void gem_transmit(CadenceGEMState *s)
824 {
825 unsigned desc[2];
826 hwaddr packet_desc_addr;
827 uint8_t tx_packet[2048];
828 uint8_t *p;
829 unsigned total_bytes;
830
831 /* Do nothing if transmit is not enabled. */
832 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
833 return;
834 }
835
836 DB_PRINT("\n");
837
838 /* The packet we will hand off to QEMU.
839 * Packets scattered across multiple descriptors are gathered to this
840 * one contiguous buffer first.
841 */
842 p = tx_packet;
843 total_bytes = 0;
844
845 /* read current descriptor */
846 packet_desc_addr = s->tx_desc_addr;
847
848 DB_PRINT("read descriptor 0x%" HWADDR_PRIx "\n", packet_desc_addr);
849 cpu_physical_memory_read(packet_desc_addr,
850 (uint8_t *)desc, sizeof(desc));
851 /* Handle all descriptors owned by hardware */
852 while (tx_desc_get_used(desc) == 0) {
853
854 /* Do nothing if transmit is not enabled. */
855 if (!(s->regs[GEM_NWCTRL] & GEM_NWCTRL_TXENA)) {
856 return;
857 }
858 print_gem_tx_desc(desc);
859
860 /* The real hardware would eat this (and possibly crash).
861 * For QEMU let's lend a helping hand.
862 */
863 if ((tx_desc_get_buffer(desc) == 0) ||
864 (tx_desc_get_length(desc) == 0)) {
865 DB_PRINT("Invalid TX descriptor @ 0x%x\n",
866 (unsigned)packet_desc_addr);
867 break;
868 }
869
870 if (tx_desc_get_length(desc) > sizeof(tx_packet) - (p - tx_packet)) {
871 DB_PRINT("TX descriptor @ 0x%x too large: size 0x%x space 0x%x\n",
872 (unsigned)packet_desc_addr,
873 (unsigned)tx_desc_get_length(desc),
874 sizeof(tx_packet) - (p - tx_packet));
875 break;
876 }
877
878 /* Gather this fragment of the packet from "dma memory" to our contig.
879 * buffer.
880 */
881 cpu_physical_memory_read(tx_desc_get_buffer(desc), p,
882 tx_desc_get_length(desc));
883 p += tx_desc_get_length(desc);
884 total_bytes += tx_desc_get_length(desc);
885
886 /* Last descriptor for this packet; hand the whole thing off */
887 if (tx_desc_get_last(desc)) {
888 unsigned desc_first[2];
889
890 /* Modify the 1st descriptor of this packet to be owned by
891 * the processor.
892 */
893 cpu_physical_memory_read(s->tx_desc_addr, (uint8_t *)desc_first,
894 sizeof(desc_first));
895 tx_desc_set_used(desc_first);
896 cpu_physical_memory_write(s->tx_desc_addr, (uint8_t *)desc_first,
897 sizeof(desc_first));
898 /* Advance the hardware current descriptor past this packet */
899 if (tx_desc_get_wrap(desc)) {
900 s->tx_desc_addr = s->regs[GEM_TXQBASE];
901 } else {
902 s->tx_desc_addr = packet_desc_addr + 8;
903 }
904 DB_PRINT("TX descriptor next: 0x%08x\n", s->tx_desc_addr);
905
906 s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_TXCMPL;
907 s->regs[GEM_ISR] |= GEM_INT_TXCMPL & ~(s->regs[GEM_IMR]);
908
909 /* Handle interrupt consequences */
910 gem_update_int_status(s);
911
912 /* Is checksum offload enabled? */
913 if (s->regs[GEM_DMACFG] & GEM_DMACFG_TXCSUM_OFFL) {
914 net_checksum_calculate(tx_packet, total_bytes);
915 }
916
917 /* Update MAC statistics */
918 gem_transmit_updatestats(s, tx_packet, total_bytes);
919
920 /* Send the packet somewhere */
921 if (s->phy_loop || (s->regs[GEM_NWCTRL] & GEM_NWCTRL_LOCALLOOP)) {
922 gem_receive(qemu_get_queue(s->nic), tx_packet, total_bytes);
923 } else {
924 qemu_send_packet(qemu_get_queue(s->nic), tx_packet,
925 total_bytes);
926 }
927
928 /* Prepare for next packet */
929 p = tx_packet;
930 total_bytes = 0;
931 }
932
933 /* read next descriptor */
934 if (tx_desc_get_wrap(desc)) {
935 packet_desc_addr = s->regs[GEM_TXQBASE];
936 } else {
937 packet_desc_addr += 8;
938 }
939 DB_PRINT("read descriptor 0x%" HWADDR_PRIx "\n", packet_desc_addr);
940 cpu_physical_memory_read(packet_desc_addr,
941 (uint8_t *)desc, sizeof(desc));
942 }
943
944 if (tx_desc_get_used(desc)) {
945 s->regs[GEM_TXSTATUS] |= GEM_TXSTATUS_USED;
946 s->regs[GEM_ISR] |= GEM_INT_TXUSED & ~(s->regs[GEM_IMR]);
947 gem_update_int_status(s);
948 }
949 }
950
951 static void gem_phy_reset(CadenceGEMState *s)
952 {
953 memset(&s->phy_regs[0], 0, sizeof(s->phy_regs));
954 s->phy_regs[PHY_REG_CONTROL] = 0x1140;
955 s->phy_regs[PHY_REG_STATUS] = 0x7969;
956 s->phy_regs[PHY_REG_PHYID1] = 0x0141;
957 s->phy_regs[PHY_REG_PHYID2] = 0x0CC2;
958 s->phy_regs[PHY_REG_ANEGADV] = 0x01E1;
959 s->phy_regs[PHY_REG_LINKPABIL] = 0xCDE1;
960 s->phy_regs[PHY_REG_ANEGEXP] = 0x000F;
961 s->phy_regs[PHY_REG_NEXTP] = 0x2001;
962 s->phy_regs[PHY_REG_LINKPNEXTP] = 0x40E6;
963 s->phy_regs[PHY_REG_100BTCTRL] = 0x0300;
964 s->phy_regs[PHY_REG_1000BTSTAT] = 0x7C00;
965 s->phy_regs[PHY_REG_EXTSTAT] = 0x3000;
966 s->phy_regs[PHY_REG_PHYSPCFC_CTL] = 0x0078;
967 s->phy_regs[PHY_REG_PHYSPCFC_ST] = 0x7C00;
968 s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL] = 0x0C60;
969 s->phy_regs[PHY_REG_LED] = 0x4100;
970 s->phy_regs[PHY_REG_EXT_PHYSPCFC_CTL2] = 0x000A;
971 s->phy_regs[PHY_REG_EXT_PHYSPCFC_ST] = 0x848B;
972
973 phy_update_link(s);
974 }
975
976 static void gem_reset(DeviceState *d)
977 {
978 int i;
979 CadenceGEMState *s = CADENCE_GEM(d);
980 const uint8_t *a;
981
982 DB_PRINT("\n");
983
984 /* Set post reset register values */
985 memset(&s->regs[0], 0, sizeof(s->regs));
986 s->regs[GEM_NWCFG] = 0x00080000;
987 s->regs[GEM_NWSTATUS] = 0x00000006;
988 s->regs[GEM_DMACFG] = 0x00020784;
989 s->regs[GEM_IMR] = 0x07ffffff;
990 s->regs[GEM_TXPAUSE] = 0x0000ffff;
991 s->regs[GEM_TXPARTIALSF] = 0x000003ff;
992 s->regs[GEM_RXPARTIALSF] = 0x000003ff;
993 s->regs[GEM_MODID] = 0x00020118;
994 s->regs[GEM_DESCONF] = 0x02500111;
995 s->regs[GEM_DESCONF2] = 0x2ab13fff;
996 s->regs[GEM_DESCONF5] = 0x002f2145;
997 s->regs[GEM_DESCONF6] = 0x00000200;
998
999 /* Set MAC address */
1000 a = &s->conf.macaddr.a[0];
1001 s->regs[GEM_SPADDR1LO] = a[0] | (a[1] << 8) | (a[2] << 16) | (a[3] << 24);
1002 s->regs[GEM_SPADDR1HI] = a[4] | (a[5] << 8);
1003
1004 for (i = 0; i < 4; i++) {
1005 s->sar_active[i] = false;
1006 }
1007
1008 gem_phy_reset(s);
1009
1010 gem_update_int_status(s);
1011 }
1012
1013 static uint16_t gem_phy_read(CadenceGEMState *s, unsigned reg_num)
1014 {
1015 DB_PRINT("reg: %d value: 0x%04x\n", reg_num, s->phy_regs[reg_num]);
1016 return s->phy_regs[reg_num];
1017 }
1018
1019 static void gem_phy_write(CadenceGEMState *s, unsigned reg_num, uint16_t val)
1020 {
1021 DB_PRINT("reg: %d value: 0x%04x\n", reg_num, val);
1022
1023 switch (reg_num) {
1024 case PHY_REG_CONTROL:
1025 if (val & PHY_REG_CONTROL_RST) {
1026 /* Phy reset */
1027 gem_phy_reset(s);
1028 val &= ~(PHY_REG_CONTROL_RST | PHY_REG_CONTROL_LOOP);
1029 s->phy_loop = 0;
1030 }
1031 if (val & PHY_REG_CONTROL_ANEG) {
1032 /* Complete autonegotiation immediately */
1033 val &= ~PHY_REG_CONTROL_ANEG;
1034 s->phy_regs[PHY_REG_STATUS] |= PHY_REG_STATUS_ANEGCMPL;
1035 }
1036 if (val & PHY_REG_CONTROL_LOOP) {
1037 DB_PRINT("PHY placed in loopback\n");
1038 s->phy_loop = 1;
1039 } else {
1040 s->phy_loop = 0;
1041 }
1042 break;
1043 }
1044 s->phy_regs[reg_num] = val;
1045 }
1046
1047 /*
1048 * gem_read32:
1049 * Read a GEM register.
1050 */
1051 static uint64_t gem_read(void *opaque, hwaddr offset, unsigned size)
1052 {
1053 CadenceGEMState *s;
1054 uint32_t retval;
1055
1056 s = (CadenceGEMState *)opaque;
1057
1058 offset >>= 2;
1059 retval = s->regs[offset];
1060
1061 DB_PRINT("offset: 0x%04x read: 0x%08x\n", (unsigned)offset*4, retval);
1062
1063 switch (offset) {
1064 case GEM_ISR:
1065 DB_PRINT("lowering irq on ISR read\n");
1066 qemu_set_irq(s->irq, 0);
1067 break;
1068 case GEM_PHYMNTNC:
1069 if (retval & GEM_PHYMNTNC_OP_R) {
1070 uint32_t phy_addr, reg_num;
1071
1072 phy_addr = (retval & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
1073 if (phy_addr == BOARD_PHY_ADDRESS || phy_addr == 0) {
1074 reg_num = (retval & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
1075 retval &= 0xFFFF0000;
1076 retval |= gem_phy_read(s, reg_num);
1077 } else {
1078 retval |= 0xFFFF; /* No device at this address */
1079 }
1080 }
1081 break;
1082 }
1083
1084 /* Squash read to clear bits */
1085 s->regs[offset] &= ~(s->regs_rtc[offset]);
1086
1087 /* Do not provide write only bits */
1088 retval &= ~(s->regs_wo[offset]);
1089
1090 DB_PRINT("0x%08x\n", retval);
1091 return retval;
1092 }
1093
1094 /*
1095 * gem_write32:
1096 * Write a GEM register.
1097 */
1098 static void gem_write(void *opaque, hwaddr offset, uint64_t val,
1099 unsigned size)
1100 {
1101 CadenceGEMState *s = (CadenceGEMState *)opaque;
1102 uint32_t readonly;
1103
1104 DB_PRINT("offset: 0x%04x write: 0x%08x ", (unsigned)offset, (unsigned)val);
1105 offset >>= 2;
1106
1107 /* Squash bits which are read only in write value */
1108 val &= ~(s->regs_ro[offset]);
1109 /* Preserve (only) bits which are read only and wtc in register */
1110 readonly = s->regs[offset] & (s->regs_ro[offset] | s->regs_w1c[offset]);
1111
1112 /* Copy register write to backing store */
1113 s->regs[offset] = (val & ~s->regs_w1c[offset]) | readonly;
1114
1115 /* do w1c */
1116 s->regs[offset] &= ~(s->regs_w1c[offset] & val);
1117
1118 /* Handle register write side effects */
1119 switch (offset) {
1120 case GEM_NWCTRL:
1121 if (val & GEM_NWCTRL_RXENA) {
1122 gem_get_rx_desc(s);
1123 }
1124 if (val & GEM_NWCTRL_TXSTART) {
1125 gem_transmit(s);
1126 }
1127 if (!(val & GEM_NWCTRL_TXENA)) {
1128 /* Reset to start of Q when transmit disabled. */
1129 s->tx_desc_addr = s->regs[GEM_TXQBASE];
1130 }
1131 if (gem_can_receive(qemu_get_queue(s->nic))) {
1132 qemu_flush_queued_packets(qemu_get_queue(s->nic));
1133 }
1134 break;
1135
1136 case GEM_TXSTATUS:
1137 gem_update_int_status(s);
1138 break;
1139 case GEM_RXQBASE:
1140 s->rx_desc_addr = val;
1141 break;
1142 case GEM_TXQBASE:
1143 s->tx_desc_addr = val;
1144 break;
1145 case GEM_RXSTATUS:
1146 gem_update_int_status(s);
1147 break;
1148 case GEM_IER:
1149 s->regs[GEM_IMR] &= ~val;
1150 gem_update_int_status(s);
1151 break;
1152 case GEM_IDR:
1153 s->regs[GEM_IMR] |= val;
1154 gem_update_int_status(s);
1155 break;
1156 case GEM_SPADDR1LO:
1157 case GEM_SPADDR2LO:
1158 case GEM_SPADDR3LO:
1159 case GEM_SPADDR4LO:
1160 s->sar_active[(offset - GEM_SPADDR1LO) / 2] = false;
1161 break;
1162 case GEM_SPADDR1HI:
1163 case GEM_SPADDR2HI:
1164 case GEM_SPADDR3HI:
1165 case GEM_SPADDR4HI:
1166 s->sar_active[(offset - GEM_SPADDR1HI) / 2] = true;
1167 break;
1168 case GEM_PHYMNTNC:
1169 if (val & GEM_PHYMNTNC_OP_W) {
1170 uint32_t phy_addr, reg_num;
1171
1172 phy_addr = (val & GEM_PHYMNTNC_ADDR) >> GEM_PHYMNTNC_ADDR_SHFT;
1173 if (phy_addr == BOARD_PHY_ADDRESS || phy_addr == 0) {
1174 reg_num = (val & GEM_PHYMNTNC_REG) >> GEM_PHYMNTNC_REG_SHIFT;
1175 gem_phy_write(s, reg_num, val);
1176 }
1177 }
1178 break;
1179 }
1180
1181 DB_PRINT("newval: 0x%08x\n", s->regs[offset]);
1182 }
1183
1184 static const MemoryRegionOps gem_ops = {
1185 .read = gem_read,
1186 .write = gem_write,
1187 .endianness = DEVICE_LITTLE_ENDIAN,
1188 };
1189
1190 static void gem_set_link(NetClientState *nc)
1191 {
1192 DB_PRINT("\n");
1193 phy_update_link(qemu_get_nic_opaque(nc));
1194 }
1195
1196 static NetClientInfo net_gem_info = {
1197 .type = NET_CLIENT_OPTIONS_KIND_NIC,
1198 .size = sizeof(NICState),
1199 .can_receive = gem_can_receive,
1200 .receive = gem_receive,
1201 .link_status_changed = gem_set_link,
1202 };
1203
1204 static int gem_init(SysBusDevice *sbd)
1205 {
1206 DeviceState *dev = DEVICE(sbd);
1207 CadenceGEMState *s = CADENCE_GEM(dev);
1208
1209 DB_PRINT("\n");
1210
1211 gem_init_register_masks(s);
1212 memory_region_init_io(&s->iomem, OBJECT(s), &gem_ops, s,
1213 "enet", sizeof(s->regs));
1214 sysbus_init_mmio(sbd, &s->iomem);
1215 sysbus_init_irq(sbd, &s->irq);
1216 qemu_macaddr_default_if_unset(&s->conf.macaddr);
1217
1218 s->nic = qemu_new_nic(&net_gem_info, &s->conf,
1219 object_get_typename(OBJECT(dev)), dev->id, s);
1220
1221 return 0;
1222 }
1223
1224 static const VMStateDescription vmstate_cadence_gem = {
1225 .name = "cadence_gem",
1226 .version_id = 2,
1227 .minimum_version_id = 2,
1228 .fields = (VMStateField[]) {
1229 VMSTATE_UINT32_ARRAY(regs, CadenceGEMState, CADENCE_GEM_MAXREG),
1230 VMSTATE_UINT16_ARRAY(phy_regs, CadenceGEMState, 32),
1231 VMSTATE_UINT8(phy_loop, CadenceGEMState),
1232 VMSTATE_UINT32(rx_desc_addr, CadenceGEMState),
1233 VMSTATE_UINT32(tx_desc_addr, CadenceGEMState),
1234 VMSTATE_BOOL_ARRAY(sar_active, CadenceGEMState, 4),
1235 VMSTATE_END_OF_LIST(),
1236 }
1237 };
1238
1239 static Property gem_properties[] = {
1240 DEFINE_NIC_PROPERTIES(CadenceGEMState, conf),
1241 DEFINE_PROP_END_OF_LIST(),
1242 };
1243
1244 static void gem_class_init(ObjectClass *klass, void *data)
1245 {
1246 DeviceClass *dc = DEVICE_CLASS(klass);
1247 SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
1248
1249 sdc->init = gem_init;
1250 dc->props = gem_properties;
1251 dc->vmsd = &vmstate_cadence_gem;
1252 dc->reset = gem_reset;
1253 }
1254
1255 static const TypeInfo gem_info = {
1256 .name = TYPE_CADENCE_GEM,
1257 .parent = TYPE_SYS_BUS_DEVICE,
1258 .instance_size = sizeof(CadenceGEMState),
1259 .class_init = gem_class_init,
1260 };
1261
1262 static void gem_register_types(void)
1263 {
1264 type_register_static(&gem_info);
1265 }
1266
1267 type_init(gem_register_types)
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