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1 /*
2  * CPSW Ethernet Switch Driver
3  *
4  * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License as
8  * published by the Free Software Foundation version 2.
9  *
10  * This program is distributed "as is" WITHOUT ANY WARRANTY of any
11  * kind, whether express or implied; without even the implied warranty
12  * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  */
15
16 #include <common.h>
17 #include <command.h>
18 #include <net.h>
19 #include <miiphy.h>
20 #include <malloc.h>
21 #include <net.h>
22 #include <netdev.h>
23 #include <asm/errno.h>
24 #include <asm/io.h>
25 #include <phy.h>
26 #include <asm/arch/cpu.h>
27
28 #define BITMASK(bits)           (BIT(bits) - 1)
29
30 #define PHY_REG_MASK            0x1f
31 #define PHY_ID_MASK             0x1f
32 #define NUM_DESCS               (PKTBUFSRX * 2)
33 #define PKT_MIN                 60
34 #define PKT_MAX                 (1500 + 14 + 4 + 4)
35 #define CLEAR_BIT               1
36
37 /* MAC_CONTROL register bits */
38 #define GIGABITEN               BIT(7)
39 #define FULLDUPLEXEN            BIT(0)
40 #define MAC_CTRL_CMD_IDLE       BIT(11)
41 #define MIIEN                   BIT(15)
42
43 /* MAC_STATUS register bits */
44 #define MAC_STAT_IDLE           BIT(31)
45
46 /* DMA Registers */
47 #define CPDMA_TXCONTROL         0x004
48 #define CPDMA_RXCONTROL         0x014
49 #define CPDMA_SOFTRESET         0x01c
50 #define CPDMA_DMACONTROL        0x020
51 #define CPDMA_DMASTATUS         0x024
52 #define CPDMA_RXFREE            0x0e0
53 #define CPDMA_TXHDP_VER1        0x100
54 #define CPDMA_TXHDP_VER2        0x200
55 #define CPDMA_RXHDP_VER1        0x120
56 #define CPDMA_RXHDP_VER2        0x220
57 #define CPDMA_TXCP_VER1         0x140
58 #define CPDMA_TXCP_VER2         0x240
59 #define CPDMA_RXCP_VER1         0x160
60 #define CPDMA_RXCP_VER2         0x260
61
62 #define DMACONTROL_CMD_IDLE     BIT(3)
63
64 #define DMASTATUS_IDLE          BIT(31)
65
66 /* Descriptor mode bits */
67 #define CPDMA_DESC_SOP          BIT(31)
68 #define CPDMA_DESC_EOP          BIT(30)
69 #define CPDMA_DESC_OWNER        BIT(29)
70 #define CPDMA_DESC_EOQ          BIT(28)
71
72 /*
73  * This timeout definition is a worst-case ultra defensive measure against
74  * unexpected controller lock ups.  Ideally, we should never ever hit this
75  * scenario in practice.
76  */
77 #define MDIO_TIMEOUT            100 /* msecs */
78 #define CPDMA_TIMEOUT           100 /* msecs */
79
80 struct cpsw_mdio_regs {
81         u32     version;
82         u32     control;
83 #define CONTROL_IDLE            BIT(31)
84 #define CONTROL_ENABLE          BIT(30)
85
86         u32     alive;
87         u32     link;
88         u32     linkintraw;
89         u32     linkintmasked;
90         u32     __reserved_0[2];
91         u32     userintraw;
92         u32     userintmasked;
93         u32     userintmaskset;
94         u32     userintmaskclr;
95         u32     __reserved_1[20];
96
97         struct {
98                 u32             access;
99                 u32             physel;
100 #define USERACCESS_GO           BIT(31)
101 #define USERACCESS_WRITE        BIT(30)
102 #define USERACCESS_ACK          BIT(29)
103 #define USERACCESS_READ         0
104 #define USERACCESS_DATA         0xffff
105         } user[0];
106 };
107
108 struct cpsw_regs {
109         u32     id_ver;
110         u32     control;
111         u32     soft_reset;
112         u32     stat_port_en;
113         u32     ptype;
114 };
115
116 struct cpsw_slave_regs {
117         u32     max_blks;
118         u32     blk_cnt;
119         u32     flow_thresh;
120         u32     port_vlan;
121         u32     tx_pri_map;
122 #ifdef CONFIG_AM33XX
123         u32     gap_thresh;
124 #elif defined(CONFIG_TI814X)
125         u32     ts_ctl;
126         u32     ts_seq_ltype;
127         u32     ts_vlan;
128 #endif
129         u32     sa_lo;
130         u32     sa_hi;
131 };
132
133 struct cpsw_host_regs {
134         u32     max_blks;
135         u32     blk_cnt;
136         u32     flow_thresh;
137         u32     port_vlan;
138         u32     tx_pri_map;
139         u32     cpdma_tx_pri_map;
140         u32     cpdma_rx_chan_map;
141 };
142
143 struct cpsw_sliver_regs {
144         u32     id_ver;
145         u32     mac_control;
146         u32     mac_status;
147         u32     soft_reset;
148         u32     rx_maxlen;
149         u32     __reserved_0;
150         u32     rx_pause;
151         u32     tx_pause;
152         u32     __reserved_1;
153         u32     rx_pri_map;
154 };
155
156 #define ALE_ENTRY_BITS          68
157 #define ALE_ENTRY_WORDS         DIV_ROUND_UP(ALE_ENTRY_BITS, 32)
158
159 /* ALE Registers */
160 #define ALE_CONTROL             0x08
161 #define ALE_UNKNOWNVLAN         0x18
162 #define ALE_TABLE_CONTROL       0x20
163 #define ALE_TABLE               0x34
164 #define ALE_PORTCTL             0x40
165
166 #define ALE_TABLE_WRITE         BIT(31)
167
168 #define ALE_TYPE_FREE                   0
169 #define ALE_TYPE_ADDR                   1
170 #define ALE_TYPE_VLAN                   2
171 #define ALE_TYPE_VLAN_ADDR              3
172
173 #define ALE_UCAST_PERSISTANT            0
174 #define ALE_UCAST_UNTOUCHED             1
175 #define ALE_UCAST_OUI                   2
176 #define ALE_UCAST_TOUCHED               3
177
178 #define ALE_MCAST_FWD                   0
179 #define ALE_MCAST_BLOCK_LEARN_FWD       1
180 #define ALE_MCAST_FWD_LEARN             2
181 #define ALE_MCAST_FWD_2                 3
182
183 enum cpsw_ale_port_state {
184         ALE_PORT_STATE_DISABLE  = 0x00,
185         ALE_PORT_STATE_BLOCK    = 0x01,
186         ALE_PORT_STATE_LEARN    = 0x02,
187         ALE_PORT_STATE_FORWARD  = 0x03,
188 };
189
190 /* ALE unicast entry flags - passed into cpsw_ale_add_ucast() */
191 #define ALE_SECURE      1
192 #define ALE_BLOCKED     2
193
194 struct cpsw_slave {
195         struct cpsw_slave_regs          *regs;
196         struct cpsw_sliver_regs         *sliver;
197         int                             slave_num;
198         u32                             mac_control;
199         struct cpsw_slave_data          *data;
200 };
201
202 struct cpdma_desc {
203         /* hardware fields */
204         u32                     hw_next;
205         u32                     hw_buffer;
206         u32                     hw_len;
207         u32                     hw_mode;
208 } __attribute__((aligned(CONFIG_SYS_CACHELINE_SIZE)));
209
210 struct cpsw_desc {
211         void *sw_buffer;
212         struct cpsw_desc *next;
213         struct cpdma_desc *dma_desc;
214 };
215
216 struct cpdma_chan {
217         struct cpsw_desc        *head, *tail;
218         void                    *hdp, *cp, *rxfree;
219 };
220
221 #define desc_write(desc, fld, val)      __raw_writel((u32)(val), &(desc)->dma_desc->fld)
222 #define desc_read(desc, fld)            __raw_readl(&(desc)->dma_desc->fld)
223 #define desc_read_ptr(desc, fld)        ((void *)__raw_readl(&(desc)->dma_desc->fld))
224
225 #define chan_write(chan, fld, val)      __raw_writel((u32)(val), (chan)->fld)
226 #define chan_read(chan, fld)            __raw_readl((chan)->fld)
227 #define chan_read_ptr(chan, fld)        ((void *)__raw_readl((chan)->fld))
228
229 #define for_active_slave(slave, priv) \
230         slave = (priv)->slaves + (priv)->data.active_slave; if (slave)
231 #define for_each_slave(slave, priv) \
232         for (slave = (priv)->slaves; slave != (priv)->slaves + \
233                                 (priv)->data->slaves; slave++)
234
235 struct cpsw_priv {
236         struct eth_device               *dev;
237         struct cpsw_platform_data       *data;
238         int                             host_port;
239
240         struct cpsw_regs                *regs;
241         void                            *dma_regs;
242         struct cpsw_host_regs           *host_port_regs;
243         void                            *ale_regs;
244
245         struct cpsw_desc                descs[NUM_DESCS];
246         struct cpsw_desc                *desc_free;
247         struct cpdma_chan               rx_chan, tx_chan;
248
249         struct cpsw_slave               *slaves;
250         struct phy_device               *phydev;
251         struct mii_dev                  *bus;
252
253         u32                             phy_mask;
254 };
255
256 static inline int cpsw_ale_get_field(u32 *ale_entry, u32 start, u32 bits)
257 {
258         int idx;
259
260         idx    = start / 32;
261         start -= idx * 32;
262         idx    = 2 - idx; /* flip */
263         return (ale_entry[idx] >> start) & BITMASK(bits);
264 }
265
266 static inline void cpsw_ale_set_field(u32 *ale_entry, u32 start, u32 bits,
267                                       u32 value)
268 {
269         int idx;
270
271         value &= BITMASK(bits);
272         idx    = start / 32;
273         start -= idx * 32;
274         idx    = 2 - idx; /* flip */
275         ale_entry[idx] &= ~(BITMASK(bits) << start);
276         ale_entry[idx] |=  (value << start);
277 }
278
279 #define DEFINE_ALE_FIELD(name, start, bits)                             \
280 static inline int cpsw_ale_get_##name(u32 *ale_entry)                   \
281 {                                                                       \
282         return cpsw_ale_get_field(ale_entry, start, bits);              \
283 }                                                                       \
284 static inline void cpsw_ale_set_##name(u32 *ale_entry, u32 value)       \
285 {                                                                       \
286         cpsw_ale_set_field(ale_entry, start, bits, value);              \
287 }
288
289 DEFINE_ALE_FIELD(entry_type,            60,     2)
290 DEFINE_ALE_FIELD(mcast_state,           62,     2)
291 DEFINE_ALE_FIELD(port_mask,             66,     3)
292 DEFINE_ALE_FIELD(ucast_type,            62,     2)
293 DEFINE_ALE_FIELD(port_num,              66,     2)
294 DEFINE_ALE_FIELD(blocked,               65,     1)
295 DEFINE_ALE_FIELD(secure,                64,     1)
296 DEFINE_ALE_FIELD(mcast,                 40,     1)
297
298 /* The MAC address field in the ALE entry cannot be macroized as above */
299 static inline void cpsw_ale_get_addr(u32 *ale_entry, u8 *addr)
300 {
301         int i;
302
303         for (i = 0; i < 6; i++)
304                 addr[i] = cpsw_ale_get_field(ale_entry, 40 - 8*i, 8);
305 }
306
307 static inline void cpsw_ale_set_addr(u32 *ale_entry, u8 *addr)
308 {
309         int i;
310
311         for (i = 0; i < 6; i++)
312                 cpsw_ale_set_field(ale_entry, 40 - 8*i, 8, addr[i]);
313 }
314
315 static int cpsw_ale_read(struct cpsw_priv *priv, int idx, u32 *ale_entry)
316 {
317         int i;
318
319         __raw_writel(idx, priv->ale_regs + ALE_TABLE_CONTROL);
320
321         for (i = 0; i < ALE_ENTRY_WORDS; i++)
322                 ale_entry[i] = __raw_readl(priv->ale_regs + ALE_TABLE + 4 * i);
323
324         return idx;
325 }
326
327 static int cpsw_ale_write(struct cpsw_priv *priv, int idx, u32 *ale_entry)
328 {
329         int i;
330
331         for (i = 0; i < ALE_ENTRY_WORDS; i++)
332                 __raw_writel(ale_entry[i], priv->ale_regs + ALE_TABLE + 4 * i);
333
334         __raw_writel(idx | ALE_TABLE_WRITE, priv->ale_regs + ALE_TABLE_CONTROL);
335
336         return idx;
337 }
338
339 static int cpsw_ale_match_addr(struct cpsw_priv *priv, u8* addr)
340 {
341         u32 ale_entry[ALE_ENTRY_WORDS];
342         int type, idx;
343
344         for (idx = 0; idx < priv->data->ale_entries; idx++) {
345                 u8 entry_addr[6];
346
347                 cpsw_ale_read(priv, idx, ale_entry);
348                 type = cpsw_ale_get_entry_type(ale_entry);
349                 if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
350                         continue;
351                 cpsw_ale_get_addr(ale_entry, entry_addr);
352                 if (memcmp(entry_addr, addr, 6) == 0)
353                         return idx;
354         }
355         return -ENOENT;
356 }
357
358 static int cpsw_ale_match_free(struct cpsw_priv *priv)
359 {
360         u32 ale_entry[ALE_ENTRY_WORDS];
361         int type, idx;
362
363         for (idx = 0; idx < priv->data->ale_entries; idx++) {
364                 cpsw_ale_read(priv, idx, ale_entry);
365                 type = cpsw_ale_get_entry_type(ale_entry);
366                 if (type == ALE_TYPE_FREE)
367                         return idx;
368         }
369         return -ENOENT;
370 }
371
372 static int cpsw_ale_find_ageable(struct cpsw_priv *priv)
373 {
374         u32 ale_entry[ALE_ENTRY_WORDS];
375         int type, idx;
376
377         for (idx = 0; idx < priv->data->ale_entries; idx++) {
378                 cpsw_ale_read(priv, idx, ale_entry);
379                 type = cpsw_ale_get_entry_type(ale_entry);
380                 if (type != ALE_TYPE_ADDR && type != ALE_TYPE_VLAN_ADDR)
381                         continue;
382                 if (cpsw_ale_get_mcast(ale_entry))
383                         continue;
384                 type = cpsw_ale_get_ucast_type(ale_entry);
385                 if (type != ALE_UCAST_PERSISTANT &&
386                     type != ALE_UCAST_OUI)
387                         return idx;
388         }
389         return -ENOENT;
390 }
391
392 static int cpsw_ale_add_ucast(struct cpsw_priv *priv, u8 *addr,
393                               int port, int flags)
394 {
395         u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
396         int idx;
397
398         cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_ADDR);
399         cpsw_ale_set_addr(ale_entry, addr);
400         cpsw_ale_set_ucast_type(ale_entry, ALE_UCAST_PERSISTANT);
401         cpsw_ale_set_secure(ale_entry, (flags & ALE_SECURE) ? 1 : 0);
402         cpsw_ale_set_blocked(ale_entry, (flags & ALE_BLOCKED) ? 1 : 0);
403         cpsw_ale_set_port_num(ale_entry, port);
404
405         idx = cpsw_ale_match_addr(priv, addr);
406         if (idx < 0)
407                 idx = cpsw_ale_match_free(priv);
408         if (idx < 0)
409                 idx = cpsw_ale_find_ageable(priv);
410         if (idx < 0)
411                 return -ENOMEM;
412
413         cpsw_ale_write(priv, idx, ale_entry);
414         return 0;
415 }
416
417 static int cpsw_ale_add_mcast(struct cpsw_priv *priv, u8 *addr, int port_mask)
418 {
419         u32 ale_entry[ALE_ENTRY_WORDS] = {0, 0, 0};
420         int idx, mask;
421
422         idx = cpsw_ale_match_addr(priv, addr);
423         if (idx >= 0)
424                 cpsw_ale_read(priv, idx, ale_entry);
425
426         cpsw_ale_set_entry_type(ale_entry, ALE_TYPE_ADDR);
427         cpsw_ale_set_addr(ale_entry, addr);
428         cpsw_ale_set_mcast_state(ale_entry, ALE_MCAST_FWD_2);
429
430         mask = cpsw_ale_get_port_mask(ale_entry);
431         port_mask |= mask;
432         cpsw_ale_set_port_mask(ale_entry, port_mask);
433
434         if (idx < 0)
435                 idx = cpsw_ale_match_free(priv);
436         if (idx < 0)
437                 idx = cpsw_ale_find_ageable(priv);
438         if (idx < 0)
439                 return -ENOMEM;
440
441         cpsw_ale_write(priv, idx, ale_entry);
442         return 0;
443 }
444
445 static inline void cpsw_ale_control(struct cpsw_priv *priv, int bit, int val)
446 {
447         u32 tmp, mask = BIT(bit);
448
449         tmp  = __raw_readl(priv->ale_regs + ALE_CONTROL);
450         tmp &= ~mask;
451         tmp |= val ? mask : 0;
452         __raw_writel(tmp, priv->ale_regs + ALE_CONTROL);
453 }
454
455 #define cpsw_ale_enable(priv, val)      cpsw_ale_control(priv, 31, val)
456 #define cpsw_ale_clear(priv, val)       cpsw_ale_control(priv, 30, val)
457 #define cpsw_ale_vlan_aware(priv, val)  cpsw_ale_control(priv,  2, val)
458
459 static inline void cpsw_ale_port_state(struct cpsw_priv *priv, int port,
460                                        int val)
461 {
462         int offset = ALE_PORTCTL + 4 * port;
463         u32 tmp, mask = 0x3;
464
465         tmp  = __raw_readl(priv->ale_regs + offset);
466         tmp &= ~mask;
467         tmp |= val & mask;
468         __raw_writel(tmp, priv->ale_regs + offset);
469 }
470
471 static struct cpsw_mdio_regs *mdio_regs;
472
473 /* wait until hardware is ready for another user access */
474 static inline u32 wait_for_user_access(void)
475 {
476         int timeout = MDIO_TIMEOUT;
477         u32 reg;
478
479         while ((reg = __raw_readl(&mdio_regs->user[0].access)) & USERACCESS_GO) {
480                 udelay(1000);
481                 if (--timeout <= 0) {
482                         printf("TIMEOUT waiting for USERACCESS_GO\n");
483                         break;
484                 }
485         }
486
487         return reg;
488 }
489
490 /* wait until hardware state machine is idle */
491 static inline void wait_for_idle(void)
492 {
493         int timeout = MDIO_TIMEOUT;
494
495         while ((__raw_readl(&mdio_regs->control) & CONTROL_IDLE) == 0) {
496                 if (--timeout <= 0) {
497                         printf("TIMEOUT waiting for state machine idle\n");
498                         break;
499                 }
500                 udelay(1000);
501         }
502 }
503
504 static int cpsw_mdio_read(struct mii_dev *bus, int phy_id,
505                                 int dev_addr, int phy_reg)
506 {
507         int data;
508         u32 reg;
509
510         if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
511                 return -EINVAL;
512
513         if (wait_for_user_access() & USERACCESS_GO)
514                 /* promote error from previous access */
515                 return -ETIME;
516
517         reg = (USERACCESS_GO | USERACCESS_READ | (phy_reg << 21) |
518                (phy_id << 16));
519         __raw_writel(reg, &mdio_regs->user[0].access);
520         reg = wait_for_user_access();
521         if (reg & USERACCESS_GO)
522                 return -ETIME;
523
524         data = (reg & USERACCESS_ACK) ? (reg & USERACCESS_DATA) : -1;
525         return data;
526 }
527
528 static int cpsw_mdio_write(struct mii_dev *bus, int phy_id, int dev_addr,
529                                 int phy_reg, u16 data)
530 {
531         u32 reg;
532
533         if (phy_reg & ~PHY_REG_MASK || phy_id & ~PHY_ID_MASK)
534                 return -EINVAL;
535
536         if (wait_for_user_access() & USERACCESS_GO)
537                 /* promote error from previous access */
538                 return -ETIME;
539
540         reg = (USERACCESS_GO | USERACCESS_WRITE | (phy_reg << 21) |
541                    (phy_id << 16) | (data & USERACCESS_DATA));
542         __raw_writel(reg, &mdio_regs->user[0].access);
543         if (wait_for_user_access() & USERACCESS_GO)
544                 return -ETIME;
545
546         return 0;
547 }
548
549 static void cpsw_mdio_init(char *name, u32 mdio_base, u32 div)
550 {
551         struct mii_dev *bus = mdio_alloc();
552
553         mdio_regs = (struct cpsw_mdio_regs *)mdio_base;
554
555         /* set enable and clock divider */
556         __raw_writel(div | CONTROL_ENABLE, &mdio_regs->control);
557
558         /*
559          * wait for scan logic to settle:
560          * the scan time consists of (a) a large fixed component, and (b) a
561          * small component that varies with the mii bus frequency.  These
562          * were estimated using measurements at 1.1 and 2.2 MHz on tnetv107x
563          * silicon.  Since the effect of (b) was found to be largely
564          * negligible, we keep things simple here.
565          */
566         udelay(1000);
567
568         bus->read = cpsw_mdio_read;
569         bus->write = cpsw_mdio_write;
570         sprintf(bus->name, name);
571
572         mdio_register(bus);
573 }
574
575 /* Set a self-clearing bit in a register, and wait for it to clear */
576 static inline void setbit_and_wait_for_clear32(void *addr)
577 {
578         int loops = 0;
579
580         __raw_writel(CLEAR_BIT, addr);
581         while (__raw_readl(addr) & CLEAR_BIT)
582                 loops++;
583         debug("%s: reset finished after %u loops\n", __func__, loops);
584 }
585
586 #define mac_hi(mac)     (((mac)[0] << 0) | ((mac)[1] << 8) |    \
587                          ((mac)[2] << 16) | ((mac)[3] << 24))
588 #define mac_lo(mac)     (((mac)[4] << 0) | ((mac)[5] << 8))
589
590 static void cpsw_set_slave_mac(struct cpsw_slave *slave,
591                                struct cpsw_priv *priv)
592 {
593         __raw_writel(mac_hi(priv->dev->enetaddr), &slave->regs->sa_hi);
594         __raw_writel(mac_lo(priv->dev->enetaddr), &slave->regs->sa_lo);
595 }
596
597 #define NUM_TRIES 50
598 static void cpsw_slave_update_link(struct cpsw_slave *slave,
599                                    struct cpsw_priv *priv, int *link)
600 {
601         struct phy_device *phy;
602         u32 mac_control = 0;
603         int retries = NUM_TRIES;
604
605         do {
606                 phy_startup(phy);
607                 *link = phy->link;
608
609                 if (*link) { /* link up */
610                         mac_control = priv->data->mac_control;
611                         if (phy->speed == 1000)
612                                 mac_control |= GIGABITEN;
613                         if (phy->duplex == DUPLEX_FULL)
614                                 mac_control |= FULLDUPLEXEN;
615                         if (phy->speed == 100)
616                                 mac_control |= MIIEN;
617                 } else {
618                         udelay(10000);
619                 }
620         } while (!*link && retries-- > 0);
621         debug("%s: mac_control: %08x -> %08x after %u loops\n", __func__,
622                 slave->mac_control, mac_control, NUM_TRIES - retries);
623
624         if (mac_control == slave->mac_control)
625                 return;
626
627         if (mac_control) {
628                 printf("link up on port %d, speed %d, %s duplex\n",
629                                 slave->slave_num, phy->speed,
630                                 (phy->duplex == DUPLEX_FULL) ? "full" : "half");
631         } else {
632                 printf("link down on port %d\n", slave->slave_num);
633         }
634
635         __raw_writel(mac_control, &slave->sliver->mac_control);
636         slave->mac_control = mac_control;
637 }
638
639 static int cpsw_update_link(struct cpsw_priv *priv)
640 {
641         int link = 0;
642         struct cpsw_slave *slave;
643
644         for_active_slave(slave, priv)
645                 cpsw_slave_update_link(slave, priv, &link);
646
647         return link;
648 }
649
650 static inline u32  cpsw_get_slave_port(struct cpsw_priv *priv, u32 slave_num)
651 {
652         if (priv->host_port == 0)
653                 return slave_num + 1;
654         else
655                 return slave_num;
656 }
657
658 static void cpsw_slave_init(struct cpsw_slave *slave, struct cpsw_priv *priv)
659 {
660         u32     slave_port;
661
662         debug("%s\n", __func__);
663         setbit_and_wait_for_clear32(&slave->sliver->soft_reset);
664
665         /* setup priority mapping */
666         __raw_writel(0x76543210, &slave->sliver->rx_pri_map);
667         __raw_writel(0x33221100, &slave->regs->tx_pri_map);
668
669         /* setup max packet size, and mac address */
670         __raw_writel(PKT_MAX, &slave->sliver->rx_maxlen);
671         cpsw_set_slave_mac(slave, priv);
672
673         slave->mac_control = 0; /* no link yet */
674
675         /* enable forwarding */
676         slave_port = cpsw_get_slave_port(priv, slave->slave_num);
677         cpsw_ale_port_state(priv, slave_port, ALE_PORT_STATE_FORWARD);
678
679         cpsw_ale_add_mcast(priv, NetBcastAddr, 1 << slave_port);
680
681         priv->phy_mask |= 1 << slave->data->phy_addr;
682 }
683
684 static void cpdma_desc_get(struct cpsw_desc *desc)
685 {
686         invalidate_dcache_range((u32)desc->dma_desc, (u32)(&desc->dma_desc[1]));
687 }
688
689 static void cpdma_desc_put(struct cpsw_desc *desc)
690 {
691         flush_dcache_range((u32)desc->dma_desc, (u32)(&desc->dma_desc[1]));
692 }
693
694 static struct cpsw_desc *cpdma_desc_alloc(struct cpsw_priv *priv)
695 {
696         struct cpsw_desc *desc = priv->desc_free;
697
698         if (desc) {
699                 cpdma_desc_get(desc);
700                 priv->desc_free = desc->next;
701         }
702         return desc;
703 }
704
705 static void cpdma_desc_free(struct cpsw_priv *priv, struct cpsw_desc *desc)
706 {
707         if (desc) {
708                 desc_write(desc, hw_next, priv->desc_free->dma_desc);
709                 cpdma_desc_put(desc);
710                 desc->next = priv->desc_free;
711                 priv->desc_free = desc;
712         }
713 }
714
715 static int cpdma_submit(struct cpsw_priv *priv, struct cpdma_chan *chan,
716                         void *buffer, int len)
717 {
718         struct cpsw_desc *desc, *prev;
719         u32 mode;
720
721         if (!buffer) {
722                 printf("ERROR: %s() NULL buffer\n", __func__);
723                 return -EINVAL;
724         }
725
726         flush_dcache_range((u32)buffer, (u32)buffer + len);
727
728         desc = cpdma_desc_alloc(priv);
729         if (!desc)
730                 return -ENOMEM;
731
732         debug("%s@%d: %cX desc %p DMA %p\n", __func__, __LINE__,
733                 chan == &priv->rx_chan ? 'R' : 'T', desc, desc->dma_desc);
734         if (len < PKT_MIN)
735                 len = PKT_MIN;
736
737         mode = CPDMA_DESC_OWNER | CPDMA_DESC_SOP | CPDMA_DESC_EOP;
738
739         desc->next = NULL;
740         desc_write(desc, hw_next,   0);
741         desc_write(desc, hw_buffer, buffer);
742         desc_write(desc, hw_len,    len);
743         desc_write(desc, hw_mode,   mode | len);
744
745         desc->sw_buffer = buffer;
746
747         cpdma_desc_put(desc);
748         if (!chan->head) {
749                 /* simple case - first packet enqueued */
750                 chan->head = desc;
751                 chan->tail = desc;
752                 chan_write(chan, hdp, desc->dma_desc);
753                 goto done;
754         }
755
756         /* not the first packet - enqueue at the tail */
757         prev = chan->tail;
758
759         prev->next = desc;
760         cpdma_desc_get(prev);
761         desc_write(prev, hw_next, desc->dma_desc);
762         cpdma_desc_put(prev);
763
764         chan->tail = desc;
765
766         /* next check if EOQ has been triggered already */
767         if (desc_read(prev, hw_mode) & CPDMA_DESC_EOQ)
768                 chan_write(chan, hdp, desc->dma_desc);
769
770 done:
771         if (chan->rxfree)
772                 chan_write(chan, rxfree, 1);
773         debug("%s@%d\n", __func__, __LINE__);
774         return 0;
775 }
776
777 static int cpdma_process(struct cpsw_priv *priv, struct cpdma_chan *chan,
778                          void **buffer, int *len)
779 {
780         struct cpsw_desc *desc = chan->head;
781         u32 status;
782
783         if (!desc)
784                 return -ENOENT;
785
786         cpdma_desc_get(desc);
787
788         status = desc_read(desc, hw_mode);
789         if (status & CPDMA_DESC_OWNER)
790                 return -EBUSY;
791
792         if (len)
793                 *len = status & 0x7ff;
794
795         if (buffer)
796                 *buffer = desc->sw_buffer;
797         debug("%s@%d: buffer=%p\n", __func__, __LINE__, desc->sw_buffer);
798
799         chan->head = desc->next;
800         chan_write(chan, cp, desc->dma_desc);
801
802         cpdma_desc_free(priv, desc);
803         return 0;
804 }
805
806 static int cpsw_init(struct eth_device *dev, bd_t *bis)
807 {
808         struct cpsw_priv        *priv = dev->priv;
809         struct cpsw_slave       *slave;
810         int i, ret;
811
812         debug("%s\n", __func__);
813         /* soft reset the controller and initialize priv */
814         setbit_and_wait_for_clear32(&priv->regs->soft_reset);
815
816         /* initialize and reset the address lookup engine */
817         cpsw_ale_enable(priv, 1);
818         cpsw_ale_clear(priv, 1);
819         cpsw_ale_vlan_aware(priv, 0); /* vlan unaware mode */
820
821         /* setup host port priority mapping */
822         __raw_writel(0x76543210, &priv->host_port_regs->cpdma_tx_pri_map);
823         __raw_writel(0, &priv->host_port_regs->cpdma_rx_chan_map);
824
825         /* disable priority elevation and enable statistics on all ports */
826         __raw_writel(0, &priv->regs->ptype);
827
828         /* enable statistics collection only on the host port */
829         __raw_writel(BIT(priv->host_port), &priv->regs->stat_port_en);
830         __raw_writel(0x7, &priv->regs->stat_port_en);
831
832         cpsw_ale_port_state(priv, priv->host_port, ALE_PORT_STATE_FORWARD);
833
834         cpsw_ale_add_ucast(priv, priv->dev->enetaddr, priv->host_port,
835                            ALE_SECURE);
836         cpsw_ale_add_mcast(priv, NetBcastAddr, 1 << priv->host_port);
837
838         for_active_slave(slave, priv)
839                 cpsw_slave_init(slave, priv);
840
841         cpsw_update_link(priv);
842
843         /* init descriptor pool */
844         for (i = 0; i < NUM_DESCS; i++) {
845                 struct cpsw_desc *next_desc = (i < (NUM_DESCS - 1)) ?
846                         &priv->descs[i + 1] : NULL;
847
848                 priv->descs[i].next = next_desc;
849                 desc_write(&priv->descs[i], hw_next,
850                         next_desc ? next_desc->dma_desc : 0);
851                 cpdma_desc_put(&priv->descs[i]);
852         }
853         priv->desc_free = &priv->descs[0];
854
855         /* initialize channels */
856         if (priv->data->version == CPSW_CTRL_VERSION_2) {
857                 memset(&priv->rx_chan, 0, sizeof(struct cpdma_chan));
858                 priv->rx_chan.hdp       = priv->dma_regs + CPDMA_RXHDP_VER2;
859                 priv->rx_chan.cp        = priv->dma_regs + CPDMA_RXCP_VER2;
860                 priv->rx_chan.rxfree    = priv->dma_regs + CPDMA_RXFREE;
861
862                 memset(&priv->tx_chan, 0, sizeof(struct cpdma_chan));
863                 priv->tx_chan.hdp       = priv->dma_regs + CPDMA_TXHDP_VER2;
864                 priv->tx_chan.cp        = priv->dma_regs + CPDMA_TXCP_VER2;
865         } else {
866                 memset(&priv->rx_chan, 0, sizeof(struct cpdma_chan));
867                 priv->rx_chan.hdp       = priv->dma_regs + CPDMA_RXHDP_VER1;
868                 priv->rx_chan.cp        = priv->dma_regs + CPDMA_RXCP_VER1;
869                 priv->rx_chan.rxfree    = priv->dma_regs + CPDMA_RXFREE;
870
871                 memset(&priv->tx_chan, 0, sizeof(struct cpdma_chan));
872                 priv->tx_chan.hdp       = priv->dma_regs + CPDMA_TXHDP_VER1;
873                 priv->tx_chan.cp        = priv->dma_regs + CPDMA_TXCP_VER1;
874         }
875
876         /* clear dma state */
877         setbit_and_wait_for_clear32(priv->dma_regs + CPDMA_SOFTRESET);
878
879         if (priv->data->version == CPSW_CTRL_VERSION_2) {
880                 for (i = 0; i < priv->data->channels; i++) {
881                         __raw_writel(0, priv->dma_regs + CPDMA_RXHDP_VER2 + 4 * i);
882                         __raw_writel(0, priv->dma_regs + CPDMA_RXFREE + 4 * i);
883                         __raw_writel(0, priv->dma_regs + CPDMA_RXCP_VER2 + 4 * i);
884                         __raw_writel(0, priv->dma_regs + CPDMA_TXHDP_VER2 + 4 * i);
885                         __raw_writel(0, priv->dma_regs + CPDMA_TXCP_VER2 + 4 * i);
886                 }
887         } else {
888                 for (i = 0; i < priv->data->channels; i++) {
889                         __raw_writel(0, priv->dma_regs + CPDMA_RXHDP_VER1 + 4 * i);
890                         __raw_writel(0, priv->dma_regs + CPDMA_RXFREE + 4 * i);
891                         __raw_writel(0, priv->dma_regs + CPDMA_RXCP_VER1 + 4 * i);
892                         __raw_writel(0, priv->dma_regs + CPDMA_TXHDP_VER1 + 4 * i);
893                         __raw_writel(0, priv->dma_regs + CPDMA_TXCP_VER1 + 4 * i);
894
895                 }
896         }
897
898         __raw_writel(1, priv->dma_regs + CPDMA_TXCONTROL);
899         __raw_writel(1, priv->dma_regs + CPDMA_RXCONTROL);
900
901         /* submit rx descs */
902         for (i = 0; i < PKTBUFSRX; i++) {
903                 ret = cpdma_submit(priv, &priv->rx_chan, NetRxPackets[i],
904                                    PKTSIZE);
905                 if (ret < 0) {
906                         printf("error %d submitting rx desc\n", ret);
907                         break;
908                 }
909         }
910
911         return ret;
912 }
913
914 static void cpsw_halt(struct eth_device *dev)
915 {
916         struct cpsw_priv        *priv = dev->priv;
917         struct cpsw_slave       *slave;
918         int idle = 0;
919         int timeout = 1000000;
920
921         __raw_writel(DMACONTROL_CMD_IDLE, priv->dma_regs + CPDMA_DMACONTROL);
922         while (!(__raw_readl(priv->dma_regs + CPDMA_DMASTATUS) &
923                         DMASTATUS_IDLE) && (--timeout >= 0))
924                 udelay(1);
925
926         timeout = 1000000;
927         while (!idle) {
928                 idle = 1;
929                 for_each_slave(slave, priv) {
930                         if (!(__raw_readl(&slave->sliver->mac_status) &
931                                         MAC_STAT_IDLE)) {
932                                 idle = 0;
933                                 break;
934                         }
935                 }
936                 if (idle || --timeout < 0)
937                         break;
938                 udelay(1);
939         }
940         if (!idle)
941                 printf("CPSW: Aborting DMA transfers; packets may be lost\n");
942
943         writel(0, priv->dma_regs + CPDMA_TXCONTROL);
944         writel(0, priv->dma_regs + CPDMA_RXCONTROL);
945
946         /* soft reset the controller and initialize priv */
947         setbit_and_wait_for_clear32(&priv->regs->soft_reset);
948
949         /* clear dma state */
950         setbit_and_wait_for_clear32(priv->dma_regs + CPDMA_SOFTRESET);
951
952         debug("%s\n", __func__);
953         priv->data->control(0);
954 }
955
956 static int cpsw_send(struct eth_device *dev, void *packet, int length)
957 {
958         struct cpsw_priv *priv = dev->priv;
959         void *buffer;
960         int len;
961
962
963         /* first reap completed packets */
964         while (cpdma_process(priv, &priv->tx_chan, &buffer, &len) == 0)
965                 /* NOP */;
966
967         return cpdma_submit(priv, &priv->tx_chan, packet, length);
968 }
969
970 static int cpsw_recv(struct eth_device *dev)
971 {
972         struct cpsw_priv        *priv = dev->priv;
973         void *buffer;
974         int len;
975
976         while (cpdma_process(priv, &priv->rx_chan, &buffer, &len) == 0) {
977                 if (buffer) {
978                         NetReceive(buffer, len);
979                         cpdma_submit(priv, &priv->rx_chan, buffer, PKTSIZE);
980                 } else {
981                         printf("NULL buffer returned from cpdma_process\n");
982                         return -EIO;
983                 }
984         }
985
986         return 0;
987 }
988
989 static void cpsw_slave_setup(struct cpsw_slave *slave, int slave_num,
990                             struct cpsw_priv *priv)
991 {
992         void                    *regs = priv->regs;
993         struct cpsw_slave_data  *data = priv->data->slave_data + slave_num;
994
995         debug("%s@%d: slave[%d] %p\n", __func__, __LINE__,
996                 slave_num, slave);
997         slave->slave_num = slave_num;
998         slave->data     = data;
999         slave->regs     = regs + data->slave_reg_ofs;
1000         slave->sliver   = regs + data->sliver_reg_ofs;
1001 }
1002
1003 static int cpsw_phy_init(struct eth_device *dev, struct cpsw_slave *slave)
1004 {
1005         struct cpsw_priv *priv = (struct cpsw_priv *)dev->priv;
1006         struct phy_device *phydev;
1007         u32 supported = PHY_GBIT_FEATURES;
1008
1009         if (slave->data->phy_id < 0) {
1010                 u32 phy_addr;
1011
1012                 for (phy_addr = 0; phy_addr < 32; phy_addr++) {
1013                         debug("Trying to connect to PHY @ addr %02x\n",
1014                                 phy_addr);
1015                         phydev = phy_connect(priv->bus, phy_addr,
1016                                         dev, slave->data->phy_if);
1017                         if (phydev)
1018                                 break;
1019                 }
1020         } else {
1021                 phydev = phy_connect(priv->bus,
1022                                 slave->data->phy_id,
1023                                 dev,
1024                                 slave->data->phy_if);
1025         }
1026         if (!phydev) {
1027                 printf("Failed to connect to PHY\n");
1028                 return -EINVAL;
1029         }
1030
1031         if (!phydev)
1032                 return -1;
1033
1034         phydev->supported &= supported;
1035         phydev->advertising = phydev->supported;
1036
1037         priv->phydev = phydev;
1038         phy_config(phydev);
1039
1040         return 0;
1041 }
1042
1043 int cpsw_register(struct cpsw_platform_data *data)
1044 {
1045         int ret = 1;
1046         struct cpsw_priv        *priv;
1047         struct cpsw_slave       *slave;
1048         void                    *regs = (void *)data->cpsw_base;
1049         struct eth_device       *dev;
1050         int i;
1051         int idx = 0;
1052
1053         debug("%s@%d\n", __func__, __LINE__);
1054
1055         dev = calloc(sizeof(*dev), 1);
1056         if (!dev)
1057                 return -ENOMEM;
1058
1059         priv = calloc(sizeof(*priv), 1);
1060         if (!priv) {
1061                 free(dev);
1062                 return -ENOMEM;
1063         }
1064
1065         priv->data = data;
1066         priv->dev = dev;
1067
1068         priv->slaves = calloc(sizeof(struct cpsw_slave), data->slaves);
1069         if (!priv->slaves) {
1070                 free(dev);
1071                 free(priv);
1072                 return -ENOMEM;
1073         }
1074
1075         priv->host_port         = data->host_port_num;
1076         priv->regs              = regs;
1077         priv->host_port_regs    = regs + data->host_port_reg_ofs;
1078         priv->dma_regs          = regs + data->cpdma_reg_ofs;
1079         priv->ale_regs          = regs + data->ale_reg_ofs;
1080         priv->descs             = (void *)regs + data->bd_ram_ofs;
1081
1082         for_each_slave(slave, priv) {
1083                 cpsw_slave_setup(slave, idx, priv);
1084                 idx = idx + 1;
1085         }
1086
1087         strcpy(dev->name, "cpsw");
1088         dev->iobase     = 0;
1089         dev->init       = cpsw_init;
1090         dev->halt       = cpsw_halt;
1091         dev->send       = cpsw_send;
1092         dev->recv       = cpsw_recv;
1093         dev->priv       = priv;
1094
1095         eth_register(dev);
1096
1097         cpsw_mdio_init(dev->name, data->mdio_base, data->mdio_div);
1098         priv->bus = miiphy_get_dev_by_name(dev->name);
1099         for_active_slave(slave, priv) {
1100                 ret = cpsw_phy_init(dev, slave);
1101                 if (ret < 0)
1102                         break;
1103         }
1104         return ret;
1105 }