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git.ipfire.org Git - people/ms/u-boot.git/blob - arch/powerpc/cpu/mpc8xx/scc.c
4 * Basic ET HW initialization and packet RX/TX routines
6 * NOTE <<<IMPORTANT: PLEASE READ>>>:
7 * Do not cache Rx/Tx buffers!
11 * MPC823 <-> MC68160 Connections:
13 * Setup MPC823 to work with MC68160 Enhanced Ethernet
14 * Serial Tranceiver as follows:
16 * MPC823 Signal MC68160 Comments
17 * ------ ------ ------- --------
18 * PA-12 ETHTX --------> TX Eth. Port Transmit Data
19 * PB-18 E_TENA --------> TENA Eth. Transmit Port Enable
20 * PA-5 ETHTCK <-------- TCLK Eth. Port Transmit Clock
21 * PA-13 ETHRX <-------- RX Eth. Port Receive Data
22 * PC-8 E_RENA <-------- RENA Eth. Receive Enable
23 * PA-6 ETHRCK <-------- RCLK Eth. Port Receive Clock
24 * PC-9 E_CLSN <-------- CLSN Eth. Port Collision Indication
26 * FADS Board Signal MC68160 Comments
27 * ----------------- ------- --------
28 * (BCSR1) ETHEN* --------> CS2 Eth. Port Enable
29 * (BSCR4) TPSQEL* --------> TPSQEL Twisted Pair Signal Quality Error Test Enable
30 * (BCSR4) TPFLDL* --------> TPFLDL Twisted Pair Full-Duplex
31 * (BCSR4) ETHLOOP --------> LOOP Eth. Port Diagnostic Loop-Back
41 #if defined(CONFIG_CMD_NET) && defined(SCC_ENET)
43 /* Ethernet Transmit and Receive Buffers */
44 #define DBUF_LENGTH 1520
48 #define TOUT_LOOP 10000 /* 10 ms to have a packet sent */
50 static char txbuf
[DBUF_LENGTH
];
52 static uint rxIdx
; /* index of the current RX buffer */
53 static uint txIdx
; /* index of the current TX buffer */
56 * SCC Ethernet Tx and Rx buffer descriptors allocated at the
57 * immr->udata_bd address on Dual-Port RAM
58 * Provide for Double Buffering
61 typedef volatile struct CommonBufferDescriptor
{
62 cbd_t rxbd
[PKTBUFSRX
]; /* Rx BD */
63 cbd_t txbd
[TX_BUF_CNT
]; /* Tx BD */
68 static int scc_send(struct eth_device
*dev
, void *packet
, int length
);
69 static int scc_recv(struct eth_device
* dev
);
70 static int scc_init (struct eth_device
* dev
, bd_t
* bd
);
71 static void scc_halt(struct eth_device
* dev
);
73 int scc_initialize(bd_t
*bis
)
75 struct eth_device
* dev
;
77 dev
= (struct eth_device
*) malloc(sizeof *dev
);
78 memset(dev
, 0, sizeof *dev
);
80 strcpy(dev
->name
, "SCC");
93 static int scc_send(struct eth_device
*dev
, void *packet
, int length
)
97 volatile char *in
, *out
;
104 while (rtx
->txbd
[txIdx
].cbd_sc
& BD_ENET_TX_READY
);
105 out
= (char *)(rtx
->txbd
[txIdx
].cbd_bufaddr
);
107 for(i
= 0; i
< length
; i
++) {
110 rtx
->txbd
[txIdx
].cbd_datlen
= length
;
111 rtx
->txbd
[txIdx
].cbd_sc
|= (BD_ENET_TX_READY
| BD_ENET_TX_LAST
);
112 while (rtx
->txbd
[txIdx
].cbd_sc
& BD_ENET_TX_READY
) j
++;
115 printf("cycles: %d status: %x\n", j
, rtx
->txbd
[txIdx
].cbd_sc
);
117 i
= (rtx
->txbd
[txIdx
++].cbd_sc
& BD_ENET_TX_STATS
) /* return only status bits */;
119 /* wrap around buffer index when necessary */
120 if (txIdx
>= TX_BUF_CNT
) txIdx
= 0;
123 while ((rtx
->txbd
[txIdx
].cbd_sc
& BD_ENET_TX_READY
) && (j
<TOUT_LOOP
)) {
124 udelay (1); /* will also trigger Wd if needed */
127 if (j
>=TOUT_LOOP
) printf("TX not ready\n");
128 rtx
->txbd
[txIdx
].cbd_bufaddr
= (uint
)packet
;
129 rtx
->txbd
[txIdx
].cbd_datlen
= length
;
130 rtx
->txbd
[txIdx
].cbd_sc
|= (BD_ENET_TX_READY
| BD_ENET_TX_LAST
|BD_ENET_TX_WRAP
);
131 while ((rtx
->txbd
[txIdx
].cbd_sc
& BD_ENET_TX_READY
) && (j
<TOUT_LOOP
)) {
132 udelay (1); /* will also trigger Wd if needed */
135 if (j
>=TOUT_LOOP
) printf("TX timeout\n");
137 printf("cycles: %d status: %x\n", j
, rtx
->txbd
[txIdx
].cbd_sc
);
139 i
= (rtx
->txbd
[txIdx
].cbd_sc
& BD_ENET_TX_STATS
) /* return only status bits */;
143 static int scc_recv (struct eth_device
*dev
)
148 /* section 16.9.23.2 */
149 if (rtx
->rxbd
[rxIdx
].cbd_sc
& BD_ENET_RX_EMPTY
) {
151 break; /* nothing received - leave for() loop */
154 length
= rtx
->rxbd
[rxIdx
].cbd_datlen
;
156 if (rtx
->rxbd
[rxIdx
].cbd_sc
& 0x003f) {
158 printf ("err: %x\n", rtx
->rxbd
[rxIdx
].cbd_sc
);
161 /* Pass the packet up to the protocol layers. */
162 net_process_received_packet(net_rx_packets
[rxIdx
],
167 /* Give the buffer back to the SCC. */
168 rtx
->rxbd
[rxIdx
].cbd_datlen
= 0;
170 /* wrap around buffer index when necessary */
171 if ((rxIdx
+ 1) >= PKTBUFSRX
) {
172 rtx
->rxbd
[PKTBUFSRX
- 1].cbd_sc
=
173 (BD_ENET_RX_WRAP
| BD_ENET_RX_EMPTY
);
176 rtx
->rxbd
[rxIdx
].cbd_sc
= BD_ENET_RX_EMPTY
;
183 /**************************************************************
185 * SCC Ethernet Initialization Routine
187 *************************************************************/
189 static int scc_init (struct eth_device
*dev
, bd_t
* bis
)
193 scc_enet_t
*pram_ptr
;
195 volatile immap_t
*immr
= (immap_t
*) CONFIG_SYS_IMMR
;
197 pram_ptr
= (scc_enet_t
*) & (immr
->im_cpm
.cp_dparam
[PROFF_ENET
]);
203 rtx
= (RTXBD
*)(immr
->im_cpm
.cp_dpmem
+ CPM_SCC_BASE
);
205 #if (defined(PA_ENET_RXD) && defined(PA_ENET_TXD))
206 /* Configure port A pins for Txd and Rxd.
208 immr
->im_ioport
.iop_papar
|= (PA_ENET_RXD
| PA_ENET_TXD
);
209 immr
->im_ioport
.iop_padir
&= ~(PA_ENET_RXD
| PA_ENET_TXD
);
210 immr
->im_ioport
.iop_paodr
&= ~PA_ENET_TXD
;
211 #elif (defined(PB_ENET_RXD) && defined(PB_ENET_TXD))
212 /* Configure port B pins for Txd and Rxd.
214 immr
->im_cpm
.cp_pbpar
|= (PB_ENET_RXD
| PB_ENET_TXD
);
215 immr
->im_cpm
.cp_pbdir
&= ~(PB_ENET_RXD
| PB_ENET_TXD
);
216 immr
->im_cpm
.cp_pbodr
&= ~PB_ENET_TXD
;
218 #error Configuration Error: exactly ONE of PA_ENET_[RT]XD, PB_ENET_[RT]XD must be defined
221 #if defined(PC_ENET_LBK)
222 /* Configure port C pins to disable External Loopback
224 immr
->im_ioport
.iop_pcpar
&= ~PC_ENET_LBK
;
225 immr
->im_ioport
.iop_pcdir
|= PC_ENET_LBK
;
226 immr
->im_ioport
.iop_pcso
&= ~PC_ENET_LBK
;
227 immr
->im_ioport
.iop_pcdat
&= ~PC_ENET_LBK
; /* Disable Loopback */
228 #endif /* PC_ENET_LBK */
230 /* Configure port C pins to enable CLSN and RENA.
232 immr
->im_ioport
.iop_pcpar
&= ~(PC_ENET_CLSN
| PC_ENET_RENA
);
233 immr
->im_ioport
.iop_pcdir
&= ~(PC_ENET_CLSN
| PC_ENET_RENA
);
234 immr
->im_ioport
.iop_pcso
|= (PC_ENET_CLSN
| PC_ENET_RENA
);
236 /* Configure port A for TCLK and RCLK.
238 immr
->im_ioport
.iop_papar
|= (PA_ENET_TCLK
| PA_ENET_RCLK
);
239 immr
->im_ioport
.iop_padir
&= ~(PA_ENET_TCLK
| PA_ENET_RCLK
);
242 * Configure Serial Interface clock routing -- see section 16.7.5.3
243 * First, clear all SCC bits to zero, then set the ones we want.
246 immr
->im_cpm
.cp_sicr
&= ~SICR_ENET_MASK
;
247 immr
->im_cpm
.cp_sicr
|= SICR_ENET_CLKRT
;
251 * Initialize SDCR -- see section 16.9.23.7
252 * SDMA configuration register
254 immr
->im_siu_conf
.sc_sdcr
= 0x01;
258 * Setup SCC Ethernet Parameter RAM
261 pram_ptr
->sen_genscc
.scc_rfcr
= 0x18; /* Normal Operation and Mot byte ordering */
262 pram_ptr
->sen_genscc
.scc_tfcr
= 0x18; /* Mot byte ordering, Normal access */
264 pram_ptr
->sen_genscc
.scc_mrblr
= DBUF_LENGTH
; /* max. ET package len 1520 */
266 pram_ptr
->sen_genscc
.scc_rbase
= (unsigned int) (&rtx
->rxbd
[0]); /* Set RXBD tbl start at Dual Port */
267 pram_ptr
->sen_genscc
.scc_tbase
= (unsigned int) (&rtx
->txbd
[0]); /* Set TXBD tbl start at Dual Port */
270 * Setup Receiver Buffer Descriptors (13.14.24.18)
275 for (i
= 0; i
< PKTBUFSRX
; i
++) {
276 rtx
->rxbd
[i
].cbd_sc
= BD_ENET_RX_EMPTY
;
277 rtx
->rxbd
[i
].cbd_datlen
= 0; /* Reset */
278 rtx
->rxbd
[i
].cbd_bufaddr
= (uint
) net_rx_packets
[i
];
281 rtx
->rxbd
[PKTBUFSRX
- 1].cbd_sc
|= BD_ENET_RX_WRAP
;
284 * Setup Ethernet Transmitter Buffer Descriptors (13.14.24.19)
286 * Add PADs to Short FRAMES, Wrap, Last, Tx CRC
289 for (i
= 0; i
< TX_BUF_CNT
; i
++) {
290 rtx
->txbd
[i
].cbd_sc
=
291 (BD_ENET_TX_PAD
| BD_ENET_TX_LAST
| BD_ENET_TX_TC
);
292 rtx
->txbd
[i
].cbd_datlen
= 0; /* Reset */
293 rtx
->txbd
[i
].cbd_bufaddr
= (uint
) (&txbuf
[0]);
296 rtx
->txbd
[TX_BUF_CNT
- 1].cbd_sc
|= BD_ENET_TX_WRAP
;
299 * Enter Command: Initialize Rx Params for SCC
302 do { /* Spin until ready to issue command */
304 } while (immr
->im_cpm
.cp_cpcr
& CPM_CR_FLG
);
306 immr
->im_cpm
.cp_cpcr
=
307 ((CPM_CR_INIT_RX
<< 8) | (CPM_CR_ENET
<< 4) | CPM_CR_FLG
);
308 do { /* Spin until command processed */
310 } while (immr
->im_cpm
.cp_cpcr
& CPM_CR_FLG
);
313 * Ethernet Specific Parameter RAM
314 * see table 13-16, pg. 660,
315 * pg. 681 (example with suggested settings)
318 pram_ptr
->sen_cpres
= ~(0x0); /* Preset CRC */
319 pram_ptr
->sen_cmask
= 0xdebb20e3; /* Constant Mask for CRC */
320 pram_ptr
->sen_crcec
= 0x0; /* Error Counter CRC (unused) */
321 pram_ptr
->sen_alec
= 0x0; /* Alignment Error Counter (unused) */
322 pram_ptr
->sen_disfc
= 0x0; /* Discard Frame Counter (unused) */
323 pram_ptr
->sen_pads
= 0x8888; /* Short Frame PAD Characters */
325 pram_ptr
->sen_retlim
= 15; /* Retry Limit Threshold */
326 pram_ptr
->sen_maxflr
= 1518; /* MAX Frame Length Register */
327 pram_ptr
->sen_minflr
= 64; /* MIN Frame Length Register */
329 pram_ptr
->sen_maxd1
= DBUF_LENGTH
; /* MAX DMA1 Length Register */
330 pram_ptr
->sen_maxd2
= DBUF_LENGTH
; /* MAX DMA2 Length Register */
332 pram_ptr
->sen_gaddr1
= 0x0; /* Group Address Filter 1 (unused) */
333 pram_ptr
->sen_gaddr2
= 0x0; /* Group Address Filter 2 (unused) */
334 pram_ptr
->sen_gaddr3
= 0x0; /* Group Address Filter 3 (unused) */
335 pram_ptr
->sen_gaddr4
= 0x0; /* Group Address Filter 4 (unused) */
337 #define ea eth_get_ethaddr()
338 pram_ptr
->sen_paddrh
= (ea
[5] << 8) + ea
[4];
339 pram_ptr
->sen_paddrm
= (ea
[3] << 8) + ea
[2];
340 pram_ptr
->sen_paddrl
= (ea
[1] << 8) + ea
[0];
343 pram_ptr
->sen_pper
= 0x0; /* Persistence (unused) */
344 pram_ptr
->sen_iaddr1
= 0x0; /* Individual Address Filter 1 (unused) */
345 pram_ptr
->sen_iaddr2
= 0x0; /* Individual Address Filter 2 (unused) */
346 pram_ptr
->sen_iaddr3
= 0x0; /* Individual Address Filter 3 (unused) */
347 pram_ptr
->sen_iaddr4
= 0x0; /* Individual Address Filter 4 (unused) */
348 pram_ptr
->sen_taddrh
= 0x0; /* Tmp Address (MSB) (unused) */
349 pram_ptr
->sen_taddrm
= 0x0; /* Tmp Address (unused) */
350 pram_ptr
->sen_taddrl
= 0x0; /* Tmp Address (LSB) (unused) */
353 * Enter Command: Initialize Tx Params for SCC
356 do { /* Spin until ready to issue command */
358 } while (immr
->im_cpm
.cp_cpcr
& CPM_CR_FLG
);
360 immr
->im_cpm
.cp_cpcr
=
361 ((CPM_CR_INIT_TX
<< 8) | (CPM_CR_ENET
<< 4) | CPM_CR_FLG
);
362 do { /* Spin until command processed */
364 } while (immr
->im_cpm
.cp_cpcr
& CPM_CR_FLG
);
367 * Mask all Events in SCCM - we use polling mode
369 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_sccm
= 0;
372 * Clear Events in SCCE -- Clear bits by writing 1's
375 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_scce
= ~(0x0);
379 * Initialize GSMR High 32-Bits
380 * Settings: Normal Mode
383 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_gsmrh
= 0;
386 * Initialize GSMR Low 32-Bits, but do not Enable Transmit/Receive
390 * TPP = Repeating 10's
394 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_gsmrl
= (SCC_GSMRL_TCI
|
397 SCC_GSMRL_MODE_ENET
);
400 * Initialize the DSR -- see section 13.14.4 (pg. 513) v0.4
403 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_dsr
= 0xd555;
406 * Initialize the PSMR
409 * NIB = Begin searching for SFD 22 bits after RENA
410 * FDE = Full Duplex Enable
411 * LPB = Loopback Enable (Needed when FDE is set)
412 * BRO = Reject broadcast packets
413 * PROMISCOUS = Catch all packets regardless of dest. MAC adress
415 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_psmr
= SCC_PSMR_ENCRC
|
417 #if defined(CONFIG_SCC_ENET_FULL_DUPLEX)
418 SCC_PSMR_FDE
| SCC_PSMR_LPB
|
420 #if defined(CONFIG_SCC_ENET_NO_BROADCAST)
423 #if defined(CONFIG_SCC_ENET_PROMISCOUS)
429 * Configure Ethernet TENA Signal
432 #if (defined(PC_ENET_TENA) && !defined(PB_ENET_TENA))
433 immr
->im_ioport
.iop_pcpar
|= PC_ENET_TENA
;
434 immr
->im_ioport
.iop_pcdir
&= ~PC_ENET_TENA
;
435 #elif (defined(PB_ENET_TENA) && !defined(PC_ENET_TENA))
436 immr
->im_cpm
.cp_pbpar
|= PB_ENET_TENA
;
437 immr
->im_cpm
.cp_pbdir
|= PB_ENET_TENA
;
439 #error Configuration Error: exactly ONE of PB_ENET_TENA, PC_ENET_TENA must be defined
443 * Set the ENT/ENR bits in the GSMR Low -- Enable Transmit/Receive
446 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_gsmrl
|=
447 (SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);
453 static void scc_halt (struct eth_device
*dev
)
455 volatile immap_t
*immr
= (immap_t
*) CONFIG_SYS_IMMR
;
457 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_gsmrl
&=
458 ~(SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);
460 immr
->im_ioport
.iop_pcso
&= ~(PC_ENET_CLSN
| PC_ENET_RENA
);
466 volatile immap_t
*immr
= (immap_t
*) CONFIG_SYS_IMMR
;
468 immr
->im_cpm
.cp_scc
[SCC_ENET
].scc_gsmrl
|=
469 (SCC_GSMRL_ENR
| SCC_GSMRL_ENT
);