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[linux-2.6.git] / drivers / net / tulip / media.c
1 /*
2         drivers/net/tulip/media.c
3
4         Maintained by Jeff Garzik <jgarzik@pobox.com>
5         Copyright 2000,2001  The Linux Kernel Team
6         Written/copyright 1994-2001 by Donald Becker.
7
8         This software may be used and distributed according to the terms
9         of the GNU General Public License, incorporated herein by reference.
10
11         Please refer to Documentation/DocBook/tulip-user.{pdf,ps,html}
12         for more information on this driver, or visit the project
13         Web page at http://sourceforge.net/projects/tulip/
14
15 */
16
17 #include <linux/kernel.h>
18 #include <linux/mii.h>
19 #include <linux/init.h>
20 #include <linux/delay.h>
21 #include <linux/pci.h>
22 #include "tulip.h"
23
24
25 /* The maximum data clock rate is 2.5 Mhz.  The minimum timing is usually
26    met by back-to-back PCI I/O cycles, but we insert a delay to avoid
27    "overclocking" issues or future 66Mhz PCI. */
28 #define mdio_delay() inl(mdio_addr)
29
30 /* Read and write the MII registers using software-generated serial
31    MDIO protocol.  It is just different enough from the EEPROM protocol
32    to not share code.  The maxium data clock rate is 2.5 Mhz. */
33 #define MDIO_SHIFT_CLK          0x10000
34 #define MDIO_DATA_WRITE0        0x00000
35 #define MDIO_DATA_WRITE1        0x20000
36 #define MDIO_ENB                0x00000 /* Ignore the 0x02000 databook setting. */
37 #define MDIO_ENB_IN             0x40000
38 #define MDIO_DATA_READ          0x80000
39
40 static const unsigned char comet_miireg2offset[32] = {
41         0xB4, 0xB8, 0xBC, 0xC0,  0xC4, 0xC8, 0xCC, 0,  0,0,0,0,  0,0,0,0,
42         0,0xD0,0,0,  0,0,0,0,  0,0,0,0, 0, 0xD4, 0xD8, 0xDC, };
43
44
45 /* MII transceiver control section.
46    Read and write the MII registers using software-generated serial
47    MDIO protocol.  See the MII specifications or DP83840A data sheet
48    for details. */
49
50 int tulip_mdio_read(struct net_device *dev, int phy_id, int location)
51 {
52         struct tulip_private *tp = netdev_priv(dev);
53         int i;
54         int read_cmd = (0xf6 << 10) | ((phy_id & 0x1f) << 5) | location;
55         int retval = 0;
56         long ioaddr = dev->base_addr;
57         long mdio_addr = ioaddr + CSR9;
58         unsigned long flags;
59
60         if (location & ~0x1f)
61                 return 0xffff;
62
63         if (tp->chip_id == COMET  &&  phy_id == 30) {
64                 if (comet_miireg2offset[location])
65                         return inl(ioaddr + comet_miireg2offset[location]);
66                 return 0xffff;
67         }
68
69         spin_lock_irqsave(&tp->mii_lock, flags);
70         if (tp->chip_id == LC82C168) {
71                 int i = 1000;
72                 outl(0x60020000 + (phy_id<<23) + (location<<18), ioaddr + 0xA0);
73                 inl(ioaddr + 0xA0);
74                 inl(ioaddr + 0xA0);
75                 while (--i > 0) {
76                         barrier();
77                         if ( ! ((retval = inl(ioaddr + 0xA0)) & 0x80000000))
78                                 break;
79                 }
80                 spin_unlock_irqrestore(&tp->mii_lock, flags);
81                 return retval & 0xffff;
82         }
83
84         /* Establish sync by sending at least 32 logic ones. */
85         for (i = 32; i >= 0; i--) {
86                 outl(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
87                 mdio_delay();
88                 outl(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
89                 mdio_delay();
90         }
91         /* Shift the read command bits out. */
92         for (i = 15; i >= 0; i--) {
93                 int dataval = (read_cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
94
95                 outl(MDIO_ENB | dataval, mdio_addr);
96                 mdio_delay();
97                 outl(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
98                 mdio_delay();
99         }
100         /* Read the two transition, 16 data, and wire-idle bits. */
101         for (i = 19; i > 0; i--) {
102                 outl(MDIO_ENB_IN, mdio_addr);
103                 mdio_delay();
104                 retval = (retval << 1) | ((inl(mdio_addr) & MDIO_DATA_READ) ? 1 : 0);
105                 outl(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
106                 mdio_delay();
107         }
108
109         spin_unlock_irqrestore(&tp->mii_lock, flags);
110         return (retval>>1) & 0xffff;
111 }
112
113 void tulip_mdio_write(struct net_device *dev, int phy_id, int location, int val)
114 {
115         struct tulip_private *tp = netdev_priv(dev);
116         int i;
117         int cmd = (0x5002 << 16) | ((phy_id & 0x1f) << 23) | (location<<18) | (val & 0xffff);
118         long ioaddr = dev->base_addr;
119         long mdio_addr = ioaddr + CSR9;
120         unsigned long flags;
121
122         if (location & ~0x1f)
123                 return;
124
125         if (tp->chip_id == COMET && phy_id == 30) {
126                 if (comet_miireg2offset[location])
127                         outl(val, ioaddr + comet_miireg2offset[location]);
128                 return;
129         }
130
131         spin_lock_irqsave(&tp->mii_lock, flags);
132         if (tp->chip_id == LC82C168) {
133                 int i = 1000;
134                 outl(cmd, ioaddr + 0xA0);
135                 do {
136                         barrier();
137                         if ( ! (inl(ioaddr + 0xA0) & 0x80000000))
138                                 break;
139                 } while (--i > 0);
140                 spin_unlock_irqrestore(&tp->mii_lock, flags);
141                 return;
142         }
143
144         /* Establish sync by sending 32 logic ones. */
145         for (i = 32; i >= 0; i--) {
146                 outl(MDIO_ENB | MDIO_DATA_WRITE1, mdio_addr);
147                 mdio_delay();
148                 outl(MDIO_ENB | MDIO_DATA_WRITE1 | MDIO_SHIFT_CLK, mdio_addr);
149                 mdio_delay();
150         }
151         /* Shift the command bits out. */
152         for (i = 31; i >= 0; i--) {
153                 int dataval = (cmd & (1 << i)) ? MDIO_DATA_WRITE1 : 0;
154                 outl(MDIO_ENB | dataval, mdio_addr);
155                 mdio_delay();
156                 outl(MDIO_ENB | dataval | MDIO_SHIFT_CLK, mdio_addr);
157                 mdio_delay();
158         }
159         /* Clear out extra bits. */
160         for (i = 2; i > 0; i--) {
161                 outl(MDIO_ENB_IN, mdio_addr);
162                 mdio_delay();
163                 outl(MDIO_ENB_IN | MDIO_SHIFT_CLK, mdio_addr);
164                 mdio_delay();
165         }
166
167         spin_unlock_irqrestore(&tp->mii_lock, flags);
168 }
169
170
171 /* Set up the transceiver control registers for the selected media type. */
172 void tulip_select_media(struct net_device *dev, int startup)
173 {
174         long ioaddr = dev->base_addr;
175         struct tulip_private *tp = netdev_priv(dev);
176         struct mediatable *mtable = tp->mtable;
177         u32 new_csr6;
178         int i;
179
180         if (mtable) {
181                 struct medialeaf *mleaf = &mtable->mleaf[tp->cur_index];
182                 unsigned char *p = mleaf->leafdata;
183                 switch (mleaf->type) {
184                 case 0:                                 /* 21140 non-MII xcvr. */
185                         if (tulip_debug > 1)
186                                 printk(KERN_DEBUG "%s: Using a 21140 non-MII transceiver"
187                                            " with control setting %2.2x.\n",
188                                            dev->name, p[1]);
189                         dev->if_port = p[0];
190                         if (startup)
191                                 outl(mtable->csr12dir | 0x100, ioaddr + CSR12);
192                         outl(p[1], ioaddr + CSR12);
193                         new_csr6 = 0x02000000 | ((p[2] & 0x71) << 18);
194                         break;
195                 case 2: case 4: {
196                         u16 setup[5];
197                         u32 csr13val, csr14val, csr15dir, csr15val;
198                         for (i = 0; i < 5; i++)
199                                 setup[i] = get_u16(&p[i*2 + 1]);
200
201                         dev->if_port = p[0] & MEDIA_MASK;
202                         if (tulip_media_cap[dev->if_port] & MediaAlwaysFD)
203                                 tp->full_duplex = 1;
204
205                         if (startup && mtable->has_reset) {
206                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
207                                 unsigned char *rst = rleaf->leafdata;
208                                 if (tulip_debug > 1)
209                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
210                                                    dev->name);
211                                 for (i = 0; i < rst[0]; i++)
212                                         outl(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
213                         }
214                         if (tulip_debug > 1)
215                                 printk(KERN_DEBUG "%s: 21143 non-MII %s transceiver control "
216                                            "%4.4x/%4.4x.\n",
217                                            dev->name, medianame[dev->if_port], setup[0], setup[1]);
218                         if (p[0] & 0x40) {      /* SIA (CSR13-15) setup values are provided. */
219                                 csr13val = setup[0];
220                                 csr14val = setup[1];
221                                 csr15dir = (setup[3]<<16) | setup[2];
222                                 csr15val = (setup[4]<<16) | setup[2];
223                                 outl(0, ioaddr + CSR13);
224                                 outl(csr14val, ioaddr + CSR14);
225                                 outl(csr15dir, ioaddr + CSR15); /* Direction */
226                                 outl(csr15val, ioaddr + CSR15); /* Data */
227                                 outl(csr13val, ioaddr + CSR13);
228                         } else {
229                                 csr13val = 1;
230                                 csr14val = 0;
231                                 csr15dir = (setup[0]<<16) | 0x0008;
232                                 csr15val = (setup[1]<<16) | 0x0008;
233                                 if (dev->if_port <= 4)
234                                         csr14val = t21142_csr14[dev->if_port];
235                                 if (startup) {
236                                         outl(0, ioaddr + CSR13);
237                                         outl(csr14val, ioaddr + CSR14);
238                                 }
239                                 outl(csr15dir, ioaddr + CSR15); /* Direction */
240                                 outl(csr15val, ioaddr + CSR15); /* Data */
241                                 if (startup) outl(csr13val, ioaddr + CSR13);
242                         }
243                         if (tulip_debug > 1)
244                                 printk(KERN_DEBUG "%s:  Setting CSR15 to %8.8x/%8.8x.\n",
245                                            dev->name, csr15dir, csr15val);
246                         if (mleaf->type == 4)
247                                 new_csr6 = 0x82020000 | ((setup[2] & 0x71) << 18);
248                         else
249                                 new_csr6 = 0x82420000;
250                         break;
251                 }
252                 case 1: case 3: {
253                         int phy_num = p[0];
254                         int init_length = p[1];
255                         u16 *misc_info, tmp_info;
256
257                         dev->if_port = 11;
258                         new_csr6 = 0x020E0000;
259                         if (mleaf->type == 3) { /* 21142 */
260                                 u16 *init_sequence = (u16*)(p+2);
261                                 u16 *reset_sequence = &((u16*)(p+3))[init_length];
262                                 int reset_length = p[2 + init_length*2];
263                                 misc_info = reset_sequence + reset_length;
264                                 if (startup)
265                                         for (i = 0; i < reset_length; i++)
266                                                 outl(get_u16(&reset_sequence[i]) << 16, ioaddr + CSR15);
267                                 for (i = 0; i < init_length; i++)
268                                         outl(get_u16(&init_sequence[i]) << 16, ioaddr + CSR15);
269                         } else {
270                                 u8 *init_sequence = p + 2;
271                                 u8 *reset_sequence = p + 3 + init_length;
272                                 int reset_length = p[2 + init_length];
273                                 misc_info = (u16*)(reset_sequence + reset_length);
274                                 if (startup) {
275                                         outl(mtable->csr12dir | 0x100, ioaddr + CSR12);
276                                         for (i = 0; i < reset_length; i++)
277                                                 outl(reset_sequence[i], ioaddr + CSR12);
278                                 }
279                                 for (i = 0; i < init_length; i++)
280                                         outl(init_sequence[i], ioaddr + CSR12);
281                         }
282                         tmp_info = get_u16(&misc_info[1]);
283                         if (tmp_info)
284                                 tp->advertising[phy_num] = tmp_info | 1;
285                         if (tmp_info && startup < 2) {
286                                 if (tp->mii_advertise == 0)
287                                         tp->mii_advertise = tp->advertising[phy_num];
288                                 if (tulip_debug > 1)
289                                         printk(KERN_DEBUG "%s:  Advertising %4.4x on MII %d.\n",
290                                                dev->name, tp->mii_advertise, tp->phys[phy_num]);
291                                 tulip_mdio_write(dev, tp->phys[phy_num], 4, tp->mii_advertise);
292                         }
293                         break;
294                 }
295                 case 5: case 6: {
296                         u16 setup[5];
297
298                         new_csr6 = 0; /* FIXME */
299
300                         for (i = 0; i < 5; i++)
301                                 setup[i] = get_u16(&p[i*2 + 1]);
302
303                         if (startup && mtable->has_reset) {
304                                 struct medialeaf *rleaf = &mtable->mleaf[mtable->has_reset];
305                                 unsigned char *rst = rleaf->leafdata;
306                                 if (tulip_debug > 1)
307                                         printk(KERN_DEBUG "%s: Resetting the transceiver.\n",
308                                                    dev->name);
309                                 for (i = 0; i < rst[0]; i++)
310                                         outl(get_u16(rst + 1 + (i<<1)) << 16, ioaddr + CSR15);
311                         }
312
313                         break;
314                 }
315                 default:
316                         printk(KERN_DEBUG "%s:  Invalid media table selection %d.\n",
317                                            dev->name, mleaf->type);
318                         new_csr6 = 0x020E0000;
319                 }
320                 if (tulip_debug > 1)
321                         printk(KERN_DEBUG "%s: Using media type %s, CSR12 is %2.2x.\n",
322                                    dev->name, medianame[dev->if_port],
323                                    inl(ioaddr + CSR12) & 0xff);
324         } else if (tp->chip_id == LC82C168) {
325                 if (startup && ! tp->medialock)
326                         dev->if_port = tp->mii_cnt ? 11 : 0;
327                 if (tulip_debug > 1)
328                         printk(KERN_DEBUG "%s: PNIC PHY status is %3.3x, media %s.\n",
329                                    dev->name, inl(ioaddr + 0xB8), medianame[dev->if_port]);
330                 if (tp->mii_cnt) {
331                         new_csr6 = 0x810C0000;
332                         outl(0x0001, ioaddr + CSR15);
333                         outl(0x0201B07A, ioaddr + 0xB8);
334                 } else if (startup) {
335                         /* Start with 10mbps to do autonegotiation. */
336                         outl(0x32, ioaddr + CSR12);
337                         new_csr6 = 0x00420000;
338                         outl(0x0001B078, ioaddr + 0xB8);
339                         outl(0x0201B078, ioaddr + 0xB8);
340                 } else if (dev->if_port == 3  ||  dev->if_port == 5) {
341                         outl(0x33, ioaddr + CSR12);
342                         new_csr6 = 0x01860000;
343                         /* Trigger autonegotiation. */
344                         outl(startup ? 0x0201F868 : 0x0001F868, ioaddr + 0xB8);
345                 } else {
346                         outl(0x32, ioaddr + CSR12);
347                         new_csr6 = 0x00420000;
348                         outl(0x1F078, ioaddr + 0xB8);
349                 }
350         } else {                                        /* Unknown chip type with no media table. */
351                 if (tp->default_port == 0)
352                         dev->if_port = tp->mii_cnt ? 11 : 3;
353                 if (tulip_media_cap[dev->if_port] & MediaIsMII) {
354                         new_csr6 = 0x020E0000;
355                 } else if (tulip_media_cap[dev->if_port] & MediaIsFx) {
356                         new_csr6 = 0x02860000;
357                 } else
358                         new_csr6 = 0x03860000;
359                 if (tulip_debug > 1)
360                         printk(KERN_DEBUG "%s: No media description table, assuming "
361                                    "%s transceiver, CSR12 %2.2x.\n",
362                                    dev->name, medianame[dev->if_port],
363                                    inl(ioaddr + CSR12));
364         }
365
366         tp->csr6 = new_csr6 | (tp->csr6 & 0xfdff) | (tp->full_duplex ? 0x0200 : 0);
367         return;
368 }
369
370 /*
371   Check the MII negotiated duplex and change the CSR6 setting if
372   required.
373   Return 0 if everything is OK.
374   Return < 0 if the transceiver is missing or has no link beat.
375   */
376 int tulip_check_duplex(struct net_device *dev)
377 {
378         struct tulip_private *tp = netdev_priv(dev);
379         unsigned int bmsr, lpa, negotiated, new_csr6;
380
381         bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
382         lpa = tulip_mdio_read(dev, tp->phys[0], MII_LPA);
383         if (tulip_debug > 1)
384                 printk(KERN_INFO "%s: MII status %4.4x, Link partner report "
385                            "%4.4x.\n", dev->name, bmsr, lpa);
386         if (bmsr == 0xffff)
387                 return -2;
388         if ((bmsr & BMSR_LSTATUS) == 0) {
389                 int new_bmsr = tulip_mdio_read(dev, tp->phys[0], MII_BMSR);
390                 if ((new_bmsr & BMSR_LSTATUS) == 0) {
391                         if (tulip_debug  > 1)
392                                 printk(KERN_INFO "%s: No link beat on the MII interface,"
393                                            " status %4.4x.\n", dev->name, new_bmsr);
394                         return -1;
395                 }
396         }
397         negotiated = lpa & tp->advertising[0];
398         tp->full_duplex = mii_duplex(tp->full_duplex_lock, negotiated);
399
400         new_csr6 = tp->csr6;
401
402         if (negotiated & LPA_100) new_csr6 &= ~TxThreshold;
403         else                      new_csr6 |= TxThreshold;
404         if (tp->full_duplex) new_csr6 |= FullDuplex;
405         else                 new_csr6 &= ~FullDuplex;
406
407         if (new_csr6 != tp->csr6) {
408                 tp->csr6 = new_csr6;
409                 tulip_restart_rxtx(tp);
410
411                 if (tulip_debug > 0)
412                         printk(KERN_INFO "%s: Setting %s-duplex based on MII"
413                                    "#%d link partner capability of %4.4x.\n",
414                                    dev->name, tp->full_duplex ? "full" : "half",
415                                    tp->phys[0], lpa);
416                 return 1;
417         }
418
419         return 0;
420 }
421
422 void __devinit tulip_find_mii (struct net_device *dev, int board_idx)
423 {
424         struct tulip_private *tp = netdev_priv(dev);
425         int phyn, phy_idx = 0;
426         int mii_reg0;
427         int mii_advert;
428         unsigned int to_advert, new_bmcr, ane_switch;
429
430         /* Find the connected MII xcvrs.
431            Doing this in open() would allow detecting external xcvrs later,
432            but takes much time. */
433         for (phyn = 1; phyn <= 32 && phy_idx < sizeof (tp->phys); phyn++) {
434                 int phy = phyn & 0x1f;
435                 int mii_status = tulip_mdio_read (dev, phy, MII_BMSR);
436                 if ((mii_status & 0x8301) == 0x8001 ||
437                     ((mii_status & BMSR_100BASE4) == 0
438                      && (mii_status & 0x7800) != 0)) {
439                         /* preserve Becker logic, gain indentation level */
440                 } else {
441                         continue;
442                 }
443
444                 mii_reg0 = tulip_mdio_read (dev, phy, MII_BMCR);
445                 mii_advert = tulip_mdio_read (dev, phy, MII_ADVERTISE);
446                 ane_switch = 0;
447
448                 /* if not advertising at all, gen an
449                  * advertising value from the capability
450                  * bits in BMSR
451                  */
452                 if ((mii_advert & ADVERTISE_ALL) == 0) {
453                         unsigned int tmpadv = tulip_mdio_read (dev, phy, MII_BMSR);
454                         mii_advert = ((tmpadv >> 6) & 0x3e0) | 1;
455                 }
456
457                 if (tp->mii_advertise) {
458                         tp->advertising[phy_idx] =
459                         to_advert = tp->mii_advertise;
460                 } else if (tp->advertising[phy_idx]) {
461                         to_advert = tp->advertising[phy_idx];
462                 } else {
463                         tp->advertising[phy_idx] =
464                         tp->mii_advertise =
465                         to_advert = mii_advert;
466                 }
467
468                 tp->phys[phy_idx++] = phy;
469
470                 printk (KERN_INFO "tulip%d:  MII transceiver #%d "
471                         "config %4.4x status %4.4x advertising %4.4x.\n",
472                         board_idx, phy, mii_reg0, mii_status, mii_advert);
473
474                 /* Fixup for DLink with miswired PHY. */
475                 if (mii_advert != to_advert) {
476                         printk (KERN_DEBUG "tulip%d:  Advertising %4.4x on PHY %d,"
477                                 " previously advertising %4.4x.\n",
478                                 board_idx, to_advert, phy, mii_advert);
479                         tulip_mdio_write (dev, phy, 4, to_advert);
480                 }
481
482                 /* Enable autonegotiation: some boards default to off. */
483                 if (tp->default_port == 0) {
484                         new_bmcr = mii_reg0 | BMCR_ANENABLE;
485                         if (new_bmcr != mii_reg0) {
486                                 new_bmcr |= BMCR_ANRESTART;
487                                 ane_switch = 1;
488                         }
489                 }
490                 /* ...or disable nway, if forcing media */
491                 else {
492                         new_bmcr = mii_reg0 & ~BMCR_ANENABLE;
493                         if (new_bmcr != mii_reg0)
494                                 ane_switch = 1;
495                 }
496
497                 /* clear out bits we never want at this point */
498                 new_bmcr &= ~(BMCR_CTST | BMCR_FULLDPLX | BMCR_ISOLATE |
499                               BMCR_PDOWN | BMCR_SPEED100 | BMCR_LOOPBACK |
500                               BMCR_RESET);
501
502                 if (tp->full_duplex)
503                         new_bmcr |= BMCR_FULLDPLX;
504                 if (tulip_media_cap[tp->default_port] & MediaIs100)
505                         new_bmcr |= BMCR_SPEED100;
506
507                 if (new_bmcr != mii_reg0) {
508                         /* some phys need the ANE switch to
509                          * happen before forced media settings
510                          * will "take."  However, we write the
511                          * same value twice in order not to
512                          * confuse the sane phys.
513                          */
514                         if (ane_switch) {
515                                 tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
516                                 udelay (10);
517                         }
518                         tulip_mdio_write (dev, phy, MII_BMCR, new_bmcr);
519                 }
520         }
521         tp->mii_cnt = phy_idx;
522         if (tp->mtable && tp->mtable->has_mii && phy_idx == 0) {
523                 printk (KERN_INFO "tulip%d: ***WARNING***: No MII transceiver found!\n",
524                         board_idx);
525                 tp->phys[0] = 1;
526         }
527 }