1 /*
2  * MPC8560 FCC Fast Ethernet
3  * Copyright (c) 2003 Motorola,Inc.
4  * Xianghua Xiao, (X.Xiao@motorola.com)
5  *
6  * Copyright (c) 2000 MontaVista Software, Inc.   Dan Malek (dmalek@jlc.net)
7  *
8  * (C) Copyright 2000 Sysgo Real-Time Solutions, GmbH <www.elinos.com>
9  * Marius Groeger <mgroeger@sysgo.de>
10  *
11  * SPDX-License-Identifier:	GPL-2.0+
12  */
13 
14 /*
15  * MPC8560 FCC Fast Ethernet
16  * Basic ET HW initialization and packet RX/TX routines
17  *
18  * This code will not perform the IO port configuration. This should be
19  * done in the iop_conf_t structure specific for the board.
20  *
21  * TODO:
22  * add a PHY driver to do the negotiation
23  * reflect negotiation results in FPSMR
24  * look for ways to configure the board specific stuff elsewhere, eg.
25  *    config_xxx.h or the board directory
26  */
27 
28 #include <common.h>
29 #include <malloc.h>
30 #include <asm/cpm_85xx.h>
31 #include <command.h>
32 #include <config.h>
33 #include <net.h>
34 
35 #if defined(CONFIG_MII) || defined(CONFIG_CMD_MII)
36 #include <miiphy.h>
37 #endif
38 
39 #if defined(CONFIG_ETHER_ON_FCC) && defined(CONFIG_CMD_NET)
40 
41 static struct ether_fcc_info_s
42 {
43 	int ether_index;
44 	int proff_enet;
45 	ulong cpm_cr_enet_sblock;
46 	ulong cpm_cr_enet_page;
47 	ulong cmxfcr_mask;
48 	ulong cmxfcr_value;
49 }
50 	ether_fcc_info[] =
51 {
52 #ifdef CONFIG_ETHER_ON_FCC1
53 {
54 	0,
55 	PROFF_FCC1,
56 	CPM_CR_FCC1_SBLOCK,
57 	CPM_CR_FCC1_PAGE,
58 	CONFIG_SYS_CMXFCR_MASK1,
59 	CONFIG_SYS_CMXFCR_VALUE1
60 },
61 #endif
62 
63 #ifdef CONFIG_ETHER_ON_FCC2
64 {
65 	1,
66 	PROFF_FCC2,
67 	CPM_CR_FCC2_SBLOCK,
68 	CPM_CR_FCC2_PAGE,
69 	CONFIG_SYS_CMXFCR_MASK2,
70 	CONFIG_SYS_CMXFCR_VALUE2
71 },
72 #endif
73 
74 #ifdef CONFIG_ETHER_ON_FCC3
75 {
76 	2,
77 	PROFF_FCC3,
78 	CPM_CR_FCC3_SBLOCK,
79 	CPM_CR_FCC3_PAGE,
80 	CONFIG_SYS_CMXFCR_MASK3,
81 	CONFIG_SYS_CMXFCR_VALUE3
82 },
83 #endif
84 };
85 
86 /*---------------------------------------------------------------------*/
87 
88 /* Maximum input DMA size.  Must be a should(?) be a multiple of 4. */
89 #define PKT_MAXDMA_SIZE         1520
90 
91 /* The FCC stores dest/src/type, data, and checksum for receive packets. */
92 #define PKT_MAXBUF_SIZE         1518
93 #define PKT_MINBUF_SIZE         64
94 
95 /* Maximum input buffer size.  Must be a multiple of 32. */
96 #define PKT_MAXBLR_SIZE         1536
97 
98 #define TOUT_LOOP 1000000
99 
100 #define TX_BUF_CNT 2
101 
102 static uint rxIdx;	/* index of the current RX buffer */
103 static uint txIdx;	/* index of the current TX buffer */
104 
105 /*
106  * FCC Ethernet Tx and Rx buffer descriptors.
107  * Provide for Double Buffering
108  * Note: PKTBUFSRX is defined in net.h
109  */
110 
111 typedef volatile struct rtxbd {
112     cbd_t rxbd[PKTBUFSRX];
113     cbd_t txbd[TX_BUF_CNT];
114 } RTXBD;
115 
116 /*  Good news: the FCC supports external BDs! */
117 #ifdef __GNUC__
118 static RTXBD rtx __attribute__ ((aligned(8)));
119 #else
120 #error "rtx must be 64-bit aligned"
121 #endif
122 
123 #undef ET_DEBUG
124 
125 static int fec_send(struct eth_device *dev, void *packet, int length)
126 {
127     int i = 0;
128     int result = 0;
129 
130     if (length <= 0) {
131 	printf("fec: bad packet size: %d\n", length);
132 	goto out;
133     }
134 
135     for(i=0; rtx.txbd[txIdx].cbd_sc & BD_ENET_TX_READY; i++) {
136 	if (i >= TOUT_LOOP) {
137 	    printf("fec: tx buffer not ready\n");
138 	    goto out;
139 	}
140     }
141 
142     rtx.txbd[txIdx].cbd_bufaddr = (uint)packet;
143     rtx.txbd[txIdx].cbd_datlen = length;
144     rtx.txbd[txIdx].cbd_sc |= (BD_ENET_TX_READY | BD_ENET_TX_LAST | \
145 			       BD_ENET_TX_TC | BD_ENET_TX_PAD);
146 
147     for(i=0; rtx.txbd[txIdx].cbd_sc & BD_ENET_TX_READY; i++) {
148 	if (i >= TOUT_LOOP) {
149 	    printf("fec: tx error\n");
150 	    goto out;
151 	}
152     }
153 
154 #ifdef ET_DEBUG
155     printf("cycles: 0x%x txIdx=0x%04x status: 0x%04x\n", i, txIdx,rtx.txbd[txIdx].cbd_sc);
156     printf("packets at 0x%08x, length_in_bytes=0x%x\n",(uint)packet,length);
157     for(i=0;i<(length/16 + 1);i++) {
158 	 printf("%08x %08x %08x %08x\n",*((uint *)rtx.txbd[txIdx].cbd_bufaddr+i*4),\
159     *((uint *)rtx.txbd[txIdx].cbd_bufaddr + i*4 + 1),*((uint *)rtx.txbd[txIdx].cbd_bufaddr + i*4 + 2), \
160     *((uint *)rtx.txbd[txIdx].cbd_bufaddr + i*4 + 3));
161     }
162 #endif
163 
164     /* return only status bits */
165     result = rtx.txbd[txIdx].cbd_sc & BD_ENET_TX_STATS;
166     txIdx = (txIdx + 1) % TX_BUF_CNT;
167 
168 out:
169     return result;
170 }
171 
172 static int fec_recv(struct eth_device* dev)
173 {
174     int length;
175 
176     for (;;)
177     {
178 	if (rtx.rxbd[rxIdx].cbd_sc & BD_ENET_RX_EMPTY) {
179 	    length = -1;
180 	    break;     /* nothing received - leave for() loop */
181 	}
182 	length = rtx.rxbd[rxIdx].cbd_datlen;
183 
184 	if (rtx.rxbd[rxIdx].cbd_sc & 0x003f) {
185 	    printf("fec: rx error %04x\n", rtx.rxbd[rxIdx].cbd_sc);
186 	}
187 	else {
188 	    /* Pass the packet up to the protocol layers. */
189 	    net_process_received_packet(net_rx_packets[rxIdx], length - 4);
190 	}
191 
192 
193 	/* Give the buffer back to the FCC. */
194 	rtx.rxbd[rxIdx].cbd_datlen = 0;
195 
196 	/* wrap around buffer index when necessary */
197 	if ((rxIdx + 1) >= PKTBUFSRX) {
198 	    rtx.rxbd[PKTBUFSRX - 1].cbd_sc = (BD_ENET_RX_WRAP | BD_ENET_RX_EMPTY);
199 	    rxIdx = 0;
200 	}
201 	else {
202 	    rtx.rxbd[rxIdx].cbd_sc = BD_ENET_RX_EMPTY;
203 	    rxIdx++;
204 	}
205     }
206     return length;
207 }
208 
209 
210 static int fec_init(struct eth_device* dev, bd_t *bis)
211 {
212     struct ether_fcc_info_s * info = dev->priv;
213     int i;
214     volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
215     volatile ccsr_cpm_cp_t *cp = &(cpm->im_cpm_cp);
216     fcc_enet_t *pram_ptr;
217     unsigned long mem_addr;
218 
219 #if 0
220     mii_discover_phy();
221 #endif
222 
223     /* 28.9 - (1-2): ioports have been set up already */
224 
225     /* 28.9 - (3): connect FCC's tx and rx clocks */
226     cpm->im_cpm_mux.cmxuar = 0; /* ATM */
227     cpm->im_cpm_mux.cmxfcr = (cpm->im_cpm_mux.cmxfcr & ~info->cmxfcr_mask) |
228 							info->cmxfcr_value;
229 
230     /* 28.9 - (4): GFMR: disable tx/rx, CCITT CRC, set Mode Ethernet */
231     if(info->ether_index == 0) {
232 	cpm->im_cpm_fcc1.gfmr = FCC_GFMR_MODE_ENET | FCC_GFMR_TCRC_32;
233     } else if (info->ether_index == 1) {
234 	cpm->im_cpm_fcc2.gfmr = FCC_GFMR_MODE_ENET | FCC_GFMR_TCRC_32;
235     } else if (info->ether_index == 2) {
236 	cpm->im_cpm_fcc3.gfmr = FCC_GFMR_MODE_ENET | FCC_GFMR_TCRC_32;
237     }
238 
239     /* 28.9 - (5): FPSMR: enable full duplex, select CCITT CRC for Ethernet,MII */
240     if(info->ether_index == 0) {
241 	cpm->im_cpm_fcc1.fpsmr = CONFIG_SYS_FCC_PSMR | FCC_PSMR_ENCRC;
242     } else if (info->ether_index == 1){
243 	cpm->im_cpm_fcc2.fpsmr = CONFIG_SYS_FCC_PSMR | FCC_PSMR_ENCRC;
244     } else if (info->ether_index == 2){
245 	cpm->im_cpm_fcc3.fpsmr = CONFIG_SYS_FCC_PSMR | FCC_PSMR_ENCRC;
246     }
247 
248     /* 28.9 - (6): FDSR: Ethernet Syn */
249     if(info->ether_index == 0) {
250 	cpm->im_cpm_fcc1.fdsr = 0xD555;
251     } else if (info->ether_index == 1) {
252 	cpm->im_cpm_fcc2.fdsr = 0xD555;
253     } else if (info->ether_index == 2) {
254 	cpm->im_cpm_fcc3.fdsr = 0xD555;
255     }
256 
257     /* reset indeces to current rx/tx bd (see eth_send()/eth_rx()) */
258     rxIdx = 0;
259     txIdx = 0;
260 
261     /* Setup Receiver Buffer Descriptors */
262     for (i = 0; i < PKTBUFSRX; i++)
263     {
264       rtx.rxbd[i].cbd_sc = BD_ENET_RX_EMPTY;
265       rtx.rxbd[i].cbd_datlen = 0;
266       rtx.rxbd[i].cbd_bufaddr = (uint)net_rx_packets[i];
267     }
268     rtx.rxbd[PKTBUFSRX - 1].cbd_sc |= BD_ENET_RX_WRAP;
269 
270     /* Setup Ethernet Transmitter Buffer Descriptors */
271     for (i = 0; i < TX_BUF_CNT; i++)
272     {
273       rtx.txbd[i].cbd_sc = 0;
274       rtx.txbd[i].cbd_datlen = 0;
275       rtx.txbd[i].cbd_bufaddr = 0;
276     }
277     rtx.txbd[TX_BUF_CNT - 1].cbd_sc |= BD_ENET_TX_WRAP;
278 
279     /* 28.9 - (7): initialize parameter ram */
280     pram_ptr = (fcc_enet_t *)&(cpm->im_dprambase[info->proff_enet]);
281 
282     /* clear whole structure to make sure all reserved fields are zero */
283     memset((void*)pram_ptr, 0, sizeof(fcc_enet_t));
284 
285     /*
286      * common Parameter RAM area
287      *
288      * Allocate space in the reserved FCC area of DPRAM for the
289      * internal buffers.  No one uses this space (yet), so we
290      * can do this.  Later, we will add resource management for
291      * this area.
292      * CPM_FCC_SPECIAL_BASE:	0xB000 for MPC8540, MPC8560
293      *				0x9000 for MPC8541, MPC8555
294      */
295     mem_addr = CPM_FCC_SPECIAL_BASE + ((info->ether_index) * 64);
296     pram_ptr->fen_genfcc.fcc_riptr = mem_addr;
297     pram_ptr->fen_genfcc.fcc_tiptr = mem_addr+32;
298     /*
299      * Set maximum bytes per receive buffer.
300      * It must be a multiple of 32.
301      */
302     pram_ptr->fen_genfcc.fcc_mrblr = PKT_MAXBLR_SIZE; /* 1536 */
303     /* localbus SDRAM should be preferred */
304     pram_ptr->fen_genfcc.fcc_rstate = (CPMFCR_GBL | CPMFCR_EB |
305 				       CONFIG_SYS_CPMFCR_RAMTYPE) << 24;
306     pram_ptr->fen_genfcc.fcc_rbase = (unsigned int)(&rtx.rxbd[rxIdx]);
307     pram_ptr->fen_genfcc.fcc_rbdstat = 0;
308     pram_ptr->fen_genfcc.fcc_rbdlen = 0;
309     pram_ptr->fen_genfcc.fcc_rdptr = 0;
310     /* localbus SDRAM should be preferred */
311     pram_ptr->fen_genfcc.fcc_tstate = (CPMFCR_GBL | CPMFCR_EB |
312 				       CONFIG_SYS_CPMFCR_RAMTYPE) << 24;
313     pram_ptr->fen_genfcc.fcc_tbase = (unsigned int)(&rtx.txbd[txIdx]);
314     pram_ptr->fen_genfcc.fcc_tbdstat = 0;
315     pram_ptr->fen_genfcc.fcc_tbdlen = 0;
316     pram_ptr->fen_genfcc.fcc_tdptr = 0;
317 
318     /* protocol-specific area */
319     pram_ptr->fen_statbuf = 0x0;
320     pram_ptr->fen_cmask = 0xdebb20e3;	/* CRC mask */
321     pram_ptr->fen_cpres = 0xffffffff;	/* CRC preset */
322     pram_ptr->fen_crcec = 0;
323     pram_ptr->fen_alec = 0;
324     pram_ptr->fen_disfc = 0;
325     pram_ptr->fen_retlim = 15;		/* Retry limit threshold */
326     pram_ptr->fen_retcnt = 0;
327     pram_ptr->fen_pper = 0;
328     pram_ptr->fen_boffcnt = 0;
329     pram_ptr->fen_gaddrh = 0;
330     pram_ptr->fen_gaddrl = 0;
331     pram_ptr->fen_mflr = PKT_MAXBUF_SIZE;   /* maximum frame length register */
332     /*
333      * Set Ethernet station address.
334      *
335      * This is supplied in the board information structure, so we
336      * copy that into the controller.
337      * So far we have only been given one Ethernet address. We make
338      * it unique by setting a few bits in the upper byte of the
339      * non-static part of the address.
340      */
341 #define ea eth_get_ethaddr()
342     pram_ptr->fen_paddrh = (ea[5] << 8) + ea[4];
343     pram_ptr->fen_paddrm = (ea[3] << 8) + ea[2];
344     pram_ptr->fen_paddrl = (ea[1] << 8) + ea[0];
345 #undef ea
346     pram_ptr->fen_ibdcount = 0;
347     pram_ptr->fen_ibdstart = 0;
348     pram_ptr->fen_ibdend = 0;
349     pram_ptr->fen_txlen = 0;
350     pram_ptr->fen_iaddrh = 0;  /* disable hash */
351     pram_ptr->fen_iaddrl = 0;
352     pram_ptr->fen_minflr = PKT_MINBUF_SIZE; /* minimum frame length register: 64 */
353     /* pad pointer. use tiptr since we don't need a specific padding char */
354     pram_ptr->fen_padptr = pram_ptr->fen_genfcc.fcc_tiptr;
355     pram_ptr->fen_maxd1 = PKT_MAXDMA_SIZE;	/* maximum DMA1 length:1520 */
356     pram_ptr->fen_maxd2 = PKT_MAXDMA_SIZE;	/* maximum DMA2 length:1520 */
357 
358 #if defined(ET_DEBUG)
359     printf("parm_ptr(0xff788500) = %p\n",pram_ptr);
360     printf("pram_ptr->fen_genfcc.fcc_rbase %08x\n",
361 	pram_ptr->fen_genfcc.fcc_rbase);
362     printf("pram_ptr->fen_genfcc.fcc_tbase %08x\n",
363 	pram_ptr->fen_genfcc.fcc_tbase);
364 #endif
365 
366     /* 28.9 - (8)(9): clear out events in FCCE */
367     /* 28.9 - (9): FCCM: mask all events */
368     if(info->ether_index == 0) {
369 	cpm->im_cpm_fcc1.fcce = ~0x0;
370 	cpm->im_cpm_fcc1.fccm = 0;
371     } else if (info->ether_index == 1) {
372 	cpm->im_cpm_fcc2.fcce = ~0x0;
373 	cpm->im_cpm_fcc2.fccm = 0;
374     } else if (info->ether_index == 2) {
375 	cpm->im_cpm_fcc3.fcce = ~0x0;
376 	cpm->im_cpm_fcc3.fccm = 0;
377     }
378 
379     /* 28.9 - (10-12): we don't use ethernet interrupts */
380 
381     /* 28.9 - (13)
382      *
383      * Let's re-initialize the channel now.  We have to do it later
384      * than the manual describes because we have just now finished
385      * the BD initialization.
386      */
387     cp->cpcr = mk_cr_cmd(info->cpm_cr_enet_page,
388 			    info->cpm_cr_enet_sblock,
389 			    0x0c,
390 			    CPM_CR_INIT_TRX) | CPM_CR_FLG;
391     do {
392 	__asm__ __volatile__ ("eieio");
393     } while (cp->cpcr & CPM_CR_FLG);
394 
395     /* 28.9 - (14): enable tx/rx in gfmr */
396     if(info->ether_index == 0) {
397 	cpm->im_cpm_fcc1.gfmr |= FCC_GFMR_ENT | FCC_GFMR_ENR;
398     } else if (info->ether_index == 1) {
399 	cpm->im_cpm_fcc2.gfmr |= FCC_GFMR_ENT | FCC_GFMR_ENR;
400     } else if (info->ether_index == 2) {
401 	cpm->im_cpm_fcc3.gfmr |= FCC_GFMR_ENT | FCC_GFMR_ENR;
402     }
403 
404     return 1;
405 }
406 
407 static void fec_halt(struct eth_device* dev)
408 {
409     struct ether_fcc_info_s * info = dev->priv;
410     volatile ccsr_cpm_t *cpm = (ccsr_cpm_t *)CONFIG_SYS_MPC85xx_CPM_ADDR;
411 
412     /* write GFMR: disable tx/rx */
413     if(info->ether_index == 0) {
414 	cpm->im_cpm_fcc1.gfmr &= ~(FCC_GFMR_ENT | FCC_GFMR_ENR);
415     } else if(info->ether_index == 1) {
416 	cpm->im_cpm_fcc2.gfmr &= ~(FCC_GFMR_ENT | FCC_GFMR_ENR);
417     } else if(info->ether_index == 2) {
418 	cpm->im_cpm_fcc3.gfmr &= ~(FCC_GFMR_ENT | FCC_GFMR_ENR);
419     }
420 }
421 
422 int fec_initialize(bd_t *bis)
423 {
424 	struct eth_device* dev;
425 	int i;
426 
427 	for (i = 0; i < sizeof(ether_fcc_info) / sizeof(ether_fcc_info[0]); i++)
428 	{
429 		dev = (struct eth_device*) malloc(sizeof *dev);
430 		memset(dev, 0, sizeof *dev);
431 
432 		sprintf(dev->name, "FCC%d",
433 			ether_fcc_info[i].ether_index + 1);
434 		dev->priv   = &ether_fcc_info[i];
435 		dev->init   = fec_init;
436 		dev->halt   = fec_halt;
437 		dev->send   = fec_send;
438 		dev->recv   = fec_recv;
439 
440 		eth_register(dev);
441 
442 #if (defined(CONFIG_MII) || defined(CONFIG_CMD_MII)) \
443 		&& defined(CONFIG_BITBANGMII)
444 		miiphy_register(dev->name,
445 				bb_miiphy_read,	bb_miiphy_write);
446 #endif
447 	}
448 
449 	return 1;
450 }
451 
452 #endif
453