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net/designware: Phy address fix
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1 /*
2  * (C) Copyright 2010
3  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
4  *
5  * See file CREDITS for list of people who contributed to this
6  * project.
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of
11  * the License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16  * GNU General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
21  * MA 02111-1307 USA
22  */
23
24 /*
25  * Designware ethernet IP driver for u-boot
26  */
27
28 #include <common.h>
29 #include <miiphy.h>
30 #include <malloc.h>
31 #include <linux/err.h>
32 #include <asm/io.h>
33 #include "designware.h"
34
35 static void tx_descs_init(struct eth_device *dev)
36 {
37         struct dw_eth_dev *priv = dev->priv;
38         struct eth_dma_regs *dma_p = priv->dma_regs_p;
39         struct dmamacdescr *desc_table_p = &priv->tx_mac_descrtable[0];
40         char *txbuffs = &priv->txbuffs[0];
41         struct dmamacdescr *desc_p;
42         u32 idx;
43
44         for (idx = 0; idx < CONFIG_TX_DESCR_NUM; idx++) {
45                 desc_p = &desc_table_p[idx];
46                 desc_p->dmamac_addr = &txbuffs[idx * CONFIG_ETH_BUFSIZE];
47                 desc_p->dmamac_next = &desc_table_p[idx + 1];
48
49 #if defined(CONFIG_DW_ALTDESCRIPTOR)
50                 desc_p->txrx_status &= ~(DESC_TXSTS_TXINT | DESC_TXSTS_TXLAST |
51                                 DESC_TXSTS_TXFIRST | DESC_TXSTS_TXCRCDIS | \
52                                 DESC_TXSTS_TXCHECKINSCTRL | \
53                                 DESC_TXSTS_TXRINGEND | DESC_TXSTS_TXPADDIS);
54
55                 desc_p->txrx_status |= DESC_TXSTS_TXCHAIN;
56                 desc_p->dmamac_cntl = 0;
57                 desc_p->txrx_status &= ~(DESC_TXSTS_MSK | DESC_TXSTS_OWNBYDMA);
58 #else
59                 desc_p->dmamac_cntl = DESC_TXCTRL_TXCHAIN;
60                 desc_p->txrx_status = 0;
61 #endif
62         }
63
64         /* Correcting the last pointer of the chain */
65         desc_p->dmamac_next = &desc_table_p[0];
66
67         writel((ulong)&desc_table_p[0], &dma_p->txdesclistaddr);
68 }
69
70 static void rx_descs_init(struct eth_device *dev)
71 {
72         struct dw_eth_dev *priv = dev->priv;
73         struct eth_dma_regs *dma_p = priv->dma_regs_p;
74         struct dmamacdescr *desc_table_p = &priv->rx_mac_descrtable[0];
75         char *rxbuffs = &priv->rxbuffs[0];
76         struct dmamacdescr *desc_p;
77         u32 idx;
78
79         for (idx = 0; idx < CONFIG_RX_DESCR_NUM; idx++) {
80                 desc_p = &desc_table_p[idx];
81                 desc_p->dmamac_addr = &rxbuffs[idx * CONFIG_ETH_BUFSIZE];
82                 desc_p->dmamac_next = &desc_table_p[idx + 1];
83
84                 desc_p->dmamac_cntl =
85                         (MAC_MAX_FRAME_SZ & DESC_RXCTRL_SIZE1MASK) | \
86                                       DESC_RXCTRL_RXCHAIN;
87
88                 desc_p->txrx_status = DESC_RXSTS_OWNBYDMA;
89         }
90
91         /* Correcting the last pointer of the chain */
92         desc_p->dmamac_next = &desc_table_p[0];
93
94         writel((ulong)&desc_table_p[0], &dma_p->rxdesclistaddr);
95 }
96
97 static void descs_init(struct eth_device *dev)
98 {
99         tx_descs_init(dev);
100         rx_descs_init(dev);
101 }
102
103 static int mac_reset(struct eth_device *dev)
104 {
105         struct dw_eth_dev *priv = dev->priv;
106         struct eth_mac_regs *mac_p = priv->mac_regs_p;
107         struct eth_dma_regs *dma_p = priv->dma_regs_p;
108
109         int timeout = CONFIG_MACRESET_TIMEOUT;
110
111         writel(DMAMAC_SRST, &dma_p->busmode);
112         writel(MII_PORTSELECT, &mac_p->conf);
113
114         do {
115                 if (!(readl(&dma_p->busmode) & DMAMAC_SRST))
116                         return 0;
117                 udelay(1000);
118         } while (timeout--);
119
120         return -1;
121 }
122
123 static int dw_write_hwaddr(struct eth_device *dev)
124 {
125         struct dw_eth_dev *priv = dev->priv;
126         struct eth_mac_regs *mac_p = priv->mac_regs_p;
127         u32 macid_lo, macid_hi;
128         u8 *mac_id = &dev->enetaddr[0];
129
130         macid_lo = mac_id[0] + (mac_id[1] << 8) + \
131                    (mac_id[2] << 16) + (mac_id[3] << 24);
132         macid_hi = mac_id[4] + (mac_id[5] << 8);
133
134         writel(macid_hi, &mac_p->macaddr0hi);
135         writel(macid_lo, &mac_p->macaddr0lo);
136
137         return 0;
138 }
139
140 static int dw_eth_init(struct eth_device *dev, bd_t *bis)
141 {
142         struct dw_eth_dev *priv = dev->priv;
143         struct eth_mac_regs *mac_p = priv->mac_regs_p;
144         struct eth_dma_regs *dma_p = priv->dma_regs_p;
145         u32 conf;
146
147         /* Reset ethernet hardware */
148         if (mac_reset(dev) < 0)
149                 return -1;
150
151         /* Resore the HW MAC address as it has been lost during MAC reset */
152         dw_write_hwaddr(dev);
153
154         writel(FIXEDBURST | PRIORXTX_41 | BURST_16,
155                         &dma_p->busmode);
156
157         writel(FLUSHTXFIFO | readl(&dma_p->opmode), &dma_p->opmode);
158         writel(STOREFORWARD | TXSECONDFRAME, &dma_p->opmode);
159
160         conf = FRAMEBURSTENABLE | DISABLERXOWN;
161
162         if (priv->speed != SPEED_1000M)
163                 conf |= MII_PORTSELECT;
164
165         if (priv->duplex == FULL_DUPLEX)
166                 conf |= FULLDPLXMODE;
167
168         writel(conf, &mac_p->conf);
169
170         descs_init(dev);
171
172         /*
173          * Start/Enable xfer at dma as well as mac level
174          */
175         writel(readl(&dma_p->opmode) | RXSTART, &dma_p->opmode);
176         writel(readl(&dma_p->opmode) | TXSTART, &dma_p->opmode);
177
178         writel(readl(&mac_p->conf) | RXENABLE, &mac_p->conf);
179         writel(readl(&mac_p->conf) | TXENABLE, &mac_p->conf);
180
181         return 0;
182 }
183
184 static int dw_eth_send(struct eth_device *dev, volatile void *packet,
185                 int length)
186 {
187         struct dw_eth_dev *priv = dev->priv;
188         struct eth_dma_regs *dma_p = priv->dma_regs_p;
189         u32 desc_num = priv->tx_currdescnum;
190         struct dmamacdescr *desc_p = &priv->tx_mac_descrtable[desc_num];
191
192         /* Check if the descriptor is owned by CPU */
193         if (desc_p->txrx_status & DESC_TXSTS_OWNBYDMA) {
194                 printf("CPU not owner of tx frame\n");
195                 return -1;
196         }
197
198         memcpy((void *)desc_p->dmamac_addr, (void *)packet, length);
199
200 #if defined(CONFIG_DW_ALTDESCRIPTOR)
201         desc_p->txrx_status |= DESC_TXSTS_TXFIRST | DESC_TXSTS_TXLAST;
202         desc_p->dmamac_cntl |= (length << DESC_TXCTRL_SIZE1SHFT) & \
203                                DESC_TXCTRL_SIZE1MASK;
204
205         desc_p->txrx_status &= ~(DESC_TXSTS_MSK);
206         desc_p->txrx_status |= DESC_TXSTS_OWNBYDMA;
207 #else
208         desc_p->dmamac_cntl |= ((length << DESC_TXCTRL_SIZE1SHFT) & \
209                                DESC_TXCTRL_SIZE1MASK) | DESC_TXCTRL_TXLAST | \
210                                DESC_TXCTRL_TXFIRST;
211
212         desc_p->txrx_status = DESC_TXSTS_OWNBYDMA;
213 #endif
214
215         /* Test the wrap-around condition. */
216         if (++desc_num >= CONFIG_TX_DESCR_NUM)
217                 desc_num = 0;
218
219         priv->tx_currdescnum = desc_num;
220
221         /* Start the transmission */
222         writel(POLL_DATA, &dma_p->txpolldemand);
223
224         return 0;
225 }
226
227 static int dw_eth_recv(struct eth_device *dev)
228 {
229         struct dw_eth_dev *priv = dev->priv;
230         u32 desc_num = priv->rx_currdescnum;
231         struct dmamacdescr *desc_p = &priv->rx_mac_descrtable[desc_num];
232
233         u32 status = desc_p->txrx_status;
234         int length = 0;
235
236         /* Check  if the owner is the CPU */
237         if (!(status & DESC_RXSTS_OWNBYDMA)) {
238
239                 length = (status & DESC_RXSTS_FRMLENMSK) >> \
240                          DESC_RXSTS_FRMLENSHFT;
241
242                 NetReceive(desc_p->dmamac_addr, length);
243
244                 /*
245                  * Make the current descriptor valid again and go to
246                  * the next one
247                  */
248                 desc_p->txrx_status |= DESC_RXSTS_OWNBYDMA;
249
250                 /* Test the wrap-around condition. */
251                 if (++desc_num >= CONFIG_RX_DESCR_NUM)
252                         desc_num = 0;
253         }
254
255         priv->rx_currdescnum = desc_num;
256
257         return length;
258 }
259
260 static void dw_eth_halt(struct eth_device *dev)
261 {
262         struct dw_eth_dev *priv = dev->priv;
263
264         mac_reset(dev);
265         priv->tx_currdescnum = priv->rx_currdescnum = 0;
266 }
267
268 static int eth_mdio_read(struct eth_device *dev, u8 addr, u8 reg, u16 *val)
269 {
270         struct dw_eth_dev *priv = dev->priv;
271         struct eth_mac_regs *mac_p = priv->mac_regs_p;
272         u32 miiaddr;
273         int timeout = CONFIG_MDIO_TIMEOUT;
274
275         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) | \
276                   ((reg << MIIREGSHIFT) & MII_REGMSK);
277
278         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
279
280         do {
281                 if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
282                         *val = readl(&mac_p->miidata);
283                         return 0;
284                 }
285                 udelay(1000);
286         } while (timeout--);
287
288         return -1;
289 }
290
291 static int eth_mdio_write(struct eth_device *dev, u8 addr, u8 reg, u16 val)
292 {
293         struct dw_eth_dev *priv = dev->priv;
294         struct eth_mac_regs *mac_p = priv->mac_regs_p;
295         u32 miiaddr;
296         int ret = -1, timeout = CONFIG_MDIO_TIMEOUT;
297         u16 value;
298
299         writel(val, &mac_p->miidata);
300         miiaddr = ((addr << MIIADDRSHIFT) & MII_ADDRMSK) | \
301                   ((reg << MIIREGSHIFT) & MII_REGMSK) | MII_WRITE;
302
303         writel(miiaddr | MII_CLKRANGE_150_250M | MII_BUSY, &mac_p->miiaddr);
304
305         do {
306                 if (!(readl(&mac_p->miiaddr) & MII_BUSY)) {
307                         ret = 0;
308                         break;
309                 }
310                 udelay(1000);
311         } while (timeout--);
312
313         /* Needed as a fix for ST-Phy */
314         eth_mdio_read(dev, addr, reg, &value);
315
316         return ret;
317 }
318
319 #if defined(CONFIG_DW_SEARCH_PHY)
320 static int find_phy(struct eth_device *dev)
321 {
322         int phy_addr = 0;
323         u16 ctrl, oldctrl;
324
325         do {
326                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
327                 oldctrl = ctrl & BMCR_ANENABLE;
328
329                 ctrl ^= BMCR_ANENABLE;
330                 eth_mdio_write(dev, phy_addr, MII_BMCR, ctrl);
331                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
332                 ctrl &= BMCR_ANENABLE;
333
334                 if (ctrl == oldctrl) {
335                         phy_addr++;
336                 } else {
337                         ctrl ^= BMCR_ANENABLE;
338                         eth_mdio_write(dev, phy_addr, MII_BMCR, ctrl);
339
340                         return phy_addr;
341                 }
342         } while (phy_addr < 32);
343
344         return -1;
345 }
346 #endif
347
348 static int dw_reset_phy(struct eth_device *dev)
349 {
350         struct dw_eth_dev *priv = dev->priv;
351         u16 ctrl;
352         int timeout = CONFIG_PHYRESET_TIMEOUT;
353         u32 phy_addr = priv->address;
354
355         eth_mdio_write(dev, phy_addr, MII_BMCR, BMCR_RESET);
356         do {
357                 eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl);
358                 if (!(ctrl & BMCR_RESET))
359                         break;
360                 udelay(1000);
361         } while (timeout--);
362
363         if (timeout < 0)
364                 return -1;
365
366 #ifdef CONFIG_PHY_RESET_DELAY
367         udelay(CONFIG_PHY_RESET_DELAY);
368 #endif
369         return 0;
370 }
371
372 static int configure_phy(struct eth_device *dev)
373 {
374         struct dw_eth_dev *priv = dev->priv;
375         int phy_addr;
376         u16 bmcr;
377 #if defined(CONFIG_DW_AUTONEG)
378         u16 bmsr;
379         u32 timeout;
380         u16 anlpar, btsr;
381 #else
382         u16 ctrl;
383 #endif
384
385 #if defined(CONFIG_DW_SEARCH_PHY)
386         phy_addr = find_phy(dev);
387         if (phy_addr >= 0)
388                 priv->address = phy_addr;
389         else
390                 return -1;
391 #else
392         phy_addr = priv->address;
393 #endif
394         if (dw_reset_phy(dev) < 0)
395                 return -1;
396
397 #if defined(CONFIG_DW_AUTONEG)
398         bmcr = BMCR_ANENABLE | BMCR_ANRESTART | BMCR_SPEED100 | \
399                BMCR_FULLDPLX | BMCR_SPEED1000;
400 #else
401         bmcr = BMCR_SPEED100 | BMCR_FULLDPLX;
402
403 #if defined(CONFIG_DW_SPEED10M)
404         bmcr &= ~BMCR_SPEED100;
405 #endif
406 #if defined(CONFIG_DW_DUPLEXHALF)
407         bmcr &= ~BMCR_FULLDPLX;
408 #endif
409 #endif
410         if (eth_mdio_write(dev, phy_addr, MII_BMCR, bmcr) < 0)
411                 return -1;
412
413         /* Read the phy status register and populate priv structure */
414 #if defined(CONFIG_DW_AUTONEG)
415         timeout = CONFIG_AUTONEG_TIMEOUT;
416         do {
417                 eth_mdio_read(dev, phy_addr, MII_BMSR, &bmsr);
418                 if (bmsr & BMSR_ANEGCOMPLETE)
419                         break;
420                 udelay(1000);
421         } while (timeout--);
422
423         eth_mdio_read(dev, phy_addr, MII_LPA, &anlpar);
424         eth_mdio_read(dev, phy_addr, MII_STAT1000, &btsr);
425
426         if (btsr & (PHY_1000BTSR_1000FD | PHY_1000BTSR_1000HD)) {
427                 priv->speed = SPEED_1000M;
428                 if (btsr & PHY_1000BTSR_1000FD)
429                         priv->duplex = FULL_DUPLEX;
430                 else
431                         priv->duplex = HALF_DUPLEX;
432         } else {
433                 if (anlpar & LPA_100)
434                         priv->speed = SPEED_100M;
435                 else
436                         priv->speed = SPEED_10M;
437
438                 if (anlpar & (LPA_10FULL | LPA_100FULL))
439                         priv->duplex = FULL_DUPLEX;
440                 else
441                         priv->duplex = HALF_DUPLEX;
442         }
443 #else
444         if (eth_mdio_read(dev, phy_addr, MII_BMCR, &ctrl) < 0)
445                 return -1;
446
447         if (ctrl & BMCR_FULLDPLX)
448                 priv->duplex = FULL_DUPLEX;
449         else
450                 priv->duplex = HALF_DUPLEX;
451
452         if (ctrl & BMCR_SPEED1000)
453                 priv->speed = SPEED_1000M;
454         else if (ctrl & BMCR_SPEED100)
455                 priv->speed = SPEED_100M;
456         else
457                 priv->speed = SPEED_10M;
458 #endif
459         return 0;
460 }
461
462 #if defined(CONFIG_MII)
463 static int dw_mii_read(const char *devname, u8 addr, u8 reg, u16 *val)
464 {
465         struct eth_device *dev;
466
467         dev = eth_get_dev_by_name(devname);
468         if (dev)
469                 eth_mdio_read(dev, addr, reg, val);
470
471         return 0;
472 }
473
474 static int dw_mii_write(const char *devname, u8 addr, u8 reg, u16 val)
475 {
476         struct eth_device *dev;
477
478         dev = eth_get_dev_by_name(devname);
479         if (dev)
480                 eth_mdio_write(dev, addr, reg, val);
481
482         return 0;
483 }
484 #endif
485
486 int designware_initialize(u32 id, ulong base_addr, u32 phy_addr)
487 {
488         struct eth_device *dev;
489         struct dw_eth_dev *priv;
490
491         dev = (struct eth_device *) malloc(sizeof(struct eth_device));
492         if (!dev)
493                 return -ENOMEM;
494
495         /*
496          * Since the priv structure contains the descriptors which need a strict
497          * buswidth alignment, memalign is used to allocate memory
498          */
499         priv = (struct dw_eth_dev *) memalign(16, sizeof(struct dw_eth_dev));
500         if (!priv) {
501                 free(dev);
502                 return -ENOMEM;
503         }
504
505         memset(dev, 0, sizeof(struct eth_device));
506         memset(priv, 0, sizeof(struct dw_eth_dev));
507
508         sprintf(dev->name, "mii%d", id);
509         dev->iobase = (int)base_addr;
510         dev->priv = priv;
511
512         eth_getenv_enetaddr_by_index("eth", id, &dev->enetaddr[0]);
513
514         priv->dev = dev;
515         priv->mac_regs_p = (struct eth_mac_regs *)base_addr;
516         priv->dma_regs_p = (struct eth_dma_regs *)(base_addr +
517                         DW_DMA_BASE_OFFSET);
518         priv->address = phy_addr;
519
520         if (mac_reset(dev) < 0)
521                 return -1;
522
523         if (configure_phy(dev) < 0) {
524                 printf("Phy could not be configured\n");
525                 return -1;
526         }
527
528         dev->init = dw_eth_init;
529         dev->send = dw_eth_send;
530         dev->recv = dw_eth_recv;
531         dev->halt = dw_eth_halt;
532         dev->write_hwaddr = dw_write_hwaddr;
533
534         eth_register(dev);
535
536 #if defined(CONFIG_MII)
537         miiphy_register(dev->name, dw_mii_read, dw_mii_write);
538 #endif
539         return 1;
540 }