Root/target/linux/ramips/files/drivers/net/ethernet/ramips/ramips_main.c

1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; version 2 of the License
5 *
6 * This program is distributed in the hope that it will be useful,
7 * but WITHOUT ANY WARRANTY; without even the implied warranty of
8 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9 * GNU General Public License for more details.
10 *
11 * You should have received a copy of the GNU General Public License
12 * along with this program; if not, write to the Free Software
13 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
14 *
15 * Copyright (C) 2009 John Crispin <blogic@openwrt.org>
16 */
17
18#include <linux/module.h>
19#include <linux/kernel.h>
20#include <linux/types.h>
21#include <linux/dma-mapping.h>
22#include <linux/init.h>
23#include <linux/skbuff.h>
24#include <linux/etherdevice.h>
25#include <linux/ethtool.h>
26#include <linux/platform_device.h>
27#include <linux/phy.h>
28
29#include <ramips_eth_platform.h>
30#include "ramips_eth.h"
31
32#define TX_TIMEOUT (20 * HZ / 100)
33#define MAX_RX_LENGTH 1600
34
35#ifdef CONFIG_RALINK_RT305X
36#include "ramips_esw.c"
37#else
38static inline int rt305x_esw_init(void) { return 0; }
39static inline void rt305x_esw_exit(void) { }
40#endif
41
42#define phys_to_bus(a) (a & 0x1FFFFFFF)
43
44#ifdef CONFIG_RAMIPS_ETH_DEBUG
45#define RADEBUG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
46#else
47#define RADEBUG(fmt, args...) do {} while (0)
48#endif
49
50static struct net_device * ramips_dev;
51static void __iomem *ramips_fe_base = 0;
52
53static inline void
54ramips_fe_wr(u32 val, unsigned reg)
55{
56    __raw_writel(val, ramips_fe_base + reg);
57}
58
59static inline u32
60ramips_fe_rr(unsigned reg)
61{
62    return __raw_readl(ramips_fe_base + reg);
63}
64
65static inline void
66ramips_fe_int_disable(u32 mask)
67{
68    ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) & ~mask,
69             RAMIPS_FE_INT_ENABLE);
70    /* flush write */
71    ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
72}
73
74static inline void
75ramips_fe_int_enable(u32 mask)
76{
77    ramips_fe_wr(ramips_fe_rr(RAMIPS_FE_INT_ENABLE) | mask,
78             RAMIPS_FE_INT_ENABLE);
79    /* flush write */
80    ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
81}
82
83static inline void
84ramips_hw_set_macaddr(unsigned char *mac)
85{
86    ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
87    ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
88             RAMIPS_GDMA1_MAC_ADRL);
89}
90
91static struct sk_buff *
92ramips_alloc_skb(struct raeth_priv *re)
93{
94    struct sk_buff *skb;
95
96    skb = netdev_alloc_skb(re->netdev, MAX_RX_LENGTH + NET_IP_ALIGN);
97    if (!skb)
98        return NULL;
99
100    skb_reserve(skb, NET_IP_ALIGN);
101
102    return skb;
103}
104
105static void
106ramips_ring_setup(struct raeth_priv *re)
107{
108    int len;
109    int i;
110
111    memset(re->tx_info, 0, NUM_TX_DESC * sizeof(struct raeth_tx_info));
112
113    len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
114    memset(re->tx, 0, len);
115
116    for (i = 0; i < NUM_TX_DESC; i++) {
117        struct raeth_tx_info *txi;
118        struct ramips_tx_dma *txd;
119
120        txd = &re->tx[i];
121        txd->txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
122        txd->txd2 = TX_DMA_LSO | TX_DMA_DONE;
123
124        txi = &re->tx_info[i];
125        txi->tx_desc = txd;
126        if (txi->tx_skb != NULL) {
127            netdev_warn(re->netdev,
128                    "dirty skb for TX desc %d\n", i);
129            txi->tx_skb = NULL;
130        }
131    }
132
133    len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
134    memset(re->rx, 0, len);
135
136    for (i = 0; i < NUM_RX_DESC; i++) {
137        struct raeth_rx_info *rxi;
138        struct ramips_rx_dma *rxd;
139        dma_addr_t dma_addr;
140
141        rxd = &re->rx[i];
142        rxi = &re->rx_info[i];
143        BUG_ON(rxi->rx_skb == NULL);
144        dma_addr = dma_map_single(&re->netdev->dev, rxi->rx_skb->data,
145                      MAX_RX_LENGTH, DMA_FROM_DEVICE);
146        rxi->rx_dma = dma_addr;
147        rxi->rx_desc = rxd;
148
149        rxd->rxd1 = (unsigned int) dma_addr;
150        rxd->rxd2 = RX_DMA_LSO;
151    }
152
153    /* flush descriptors */
154    wmb();
155}
156
157static void
158ramips_ring_cleanup(struct raeth_priv *re)
159{
160    int i;
161
162    for (i = 0; i < NUM_RX_DESC; i++) {
163        struct raeth_rx_info *rxi;
164
165        rxi = &re->rx_info[i];
166        if (rxi->rx_skb)
167            dma_unmap_single(&re->netdev->dev, rxi->rx_dma,
168                     MAX_RX_LENGTH, DMA_FROM_DEVICE);
169    }
170
171    for (i = 0; i < NUM_TX_DESC; i++) {
172        struct raeth_tx_info *txi;
173
174        txi = &re->tx_info[i];
175        if (txi->tx_skb) {
176            dev_kfree_skb_any(txi->tx_skb);
177            txi->tx_skb = NULL;
178        }
179    }
180}
181
182#if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883)
183
184#define RAMIPS_MDIO_RETRY 1000
185
186static unsigned char *ramips_speed_str(struct raeth_priv *re)
187{
188    switch (re->speed) {
189    case SPEED_1000:
190        return "1000";
191    case SPEED_100:
192        return "100";
193    case SPEED_10:
194        return "10";
195    }
196
197    return "?";
198}
199
200static void ramips_link_adjust(struct raeth_priv *re)
201{
202    struct ramips_eth_platform_data *pdata;
203    u32 mdio_cfg;
204
205    pdata = re->parent->platform_data;
206    if (!re->link) {
207        netif_carrier_off(re->netdev);
208        netdev_info(re->netdev, "link down\n");
209        return;
210    }
211
212    mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
213           RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
214           RAMIPS_MDIO_CFG_GP1_FRC_EN;
215
216    if (re->duplex == DUPLEX_FULL)
217        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
218
219    if (re->tx_fc)
220        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
221
222    if (re->rx_fc)
223        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
224
225    switch (re->speed) {
226    case SPEED_10:
227        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
228        break;
229    case SPEED_100:
230        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
231        break;
232    case SPEED_1000:
233        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
234        break;
235    default:
236        BUG();
237    }
238
239    ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
240
241    netif_carrier_on(re->netdev);
242    netdev_info(re->netdev, "link up (%sMbps/%s duplex)\n",
243            ramips_speed_str(re),
244            (DUPLEX_FULL == re->duplex) ? "Full" : "Half");
245}
246
247static int
248ramips_mdio_wait_ready(struct raeth_priv *re)
249{
250    int retries;
251
252    retries = RAMIPS_MDIO_RETRY;
253    while (1) {
254        u32 t;
255
256        t = ramips_fe_rr(RAMIPS_MDIO_ACCESS);
257        if ((t & (0x1 << 31)) == 0)
258            return 0;
259
260        if (retries-- == 0)
261            break;
262
263        udelay(1);
264    }
265
266    dev_err(re->parent, "MDIO operation timed out\n");
267    return -ETIMEDOUT;
268}
269
270static int
271ramips_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
272{
273    struct raeth_priv *re = bus->priv;
274    int err;
275    u32 t;
276
277    err = ramips_mdio_wait_ready(re);
278    if (err)
279        return 0xffff;
280
281    t = (phy_addr << 24) | (phy_reg << 16);
282    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
283    t |= (1 << 31);
284    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
285
286    err = ramips_mdio_wait_ready(re);
287    if (err)
288        return 0xffff;
289
290    RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
291        phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
292
293    return ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff;
294}
295
296static int
297ramips_mdio_write(struct mii_bus *bus, int phy_addr, int phy_reg, u16 val)
298{
299    struct raeth_priv *re = bus->priv;
300    int err;
301    u32 t;
302
303    RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
304        phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
305
306    err = ramips_mdio_wait_ready(re);
307    if (err)
308        return err;
309
310    t = (1 << 30) | (phy_addr << 24) | (phy_reg << 16) | val;
311    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
312    t |= (1 << 31);
313    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
314
315    return ramips_mdio_wait_ready(re);
316}
317
318static int
319ramips_mdio_reset(struct mii_bus *bus)
320{
321    /* TODO */
322    return 0;
323}
324
325static int
326ramips_mdio_init(struct raeth_priv *re)
327{
328    int err;
329    int i;
330
331    re->mii_bus = mdiobus_alloc();
332    if (re->mii_bus == NULL)
333        return -ENOMEM;
334
335    re->mii_bus->name = "ramips_mdio";
336    re->mii_bus->read = ramips_mdio_read;
337    re->mii_bus->write = ramips_mdio_write;
338    re->mii_bus->reset = ramips_mdio_reset;
339    re->mii_bus->irq = re->mii_irq;
340    re->mii_bus->priv = re;
341    re->mii_bus->parent = re->parent;
342
343    snprintf(re->mii_bus->id, MII_BUS_ID_SIZE, "%s", "ramips_mdio");
344    re->mii_bus->phy_mask = 0;
345
346    for (i = 0; i < PHY_MAX_ADDR; i++)
347        re->mii_irq[i] = PHY_POLL;
348
349    err = mdiobus_register(re->mii_bus);
350    if (err)
351        goto err_free_bus;
352
353    return 0;
354
355err_free_bus:
356    kfree(re->mii_bus);
357    return err;
358}
359
360static void
361ramips_mdio_cleanup(struct raeth_priv *re)
362{
363    mdiobus_unregister(re->mii_bus);
364    kfree(re->mii_bus);
365}
366
367static void
368ramips_phy_link_adjust(struct net_device *dev)
369{
370    struct raeth_priv *re = netdev_priv(dev);
371    struct phy_device *phydev = re->phy_dev;
372    unsigned long flags;
373    int status_change = 0;
374
375    spin_lock_irqsave(&re->phy_lock, flags);
376
377    if (phydev->link)
378        if (re->duplex != phydev->duplex ||
379            re->speed != phydev->speed)
380            status_change = 1;
381
382    if (phydev->link != re->link)
383        status_change = 1;
384
385    re->link = phydev->link;
386    re->duplex = phydev->duplex;
387    re->speed = phydev->speed;
388
389    if (status_change)
390        ramips_link_adjust(re);
391
392    spin_unlock_irqrestore(&re->phy_lock, flags);
393}
394
395static int
396ramips_phy_connect_multi(struct raeth_priv *re)
397{
398    struct net_device *netdev = re->netdev;
399    struct ramips_eth_platform_data *pdata;
400    struct phy_device *phydev = NULL;
401    int phy_addr;
402    int ret = 0;
403
404    pdata = re->parent->platform_data;
405    for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
406        if (!(pdata->phy_mask & (1 << phy_addr)))
407            continue;
408
409        if (re->mii_bus->phy_map[phy_addr] == NULL)
410            continue;
411
412        RADEBUG("%s: PHY found at %s, uid=%08x\n",
413            netdev->name,
414            dev_name(&re->mii_bus->phy_map[phy_addr]->dev),
415            re->mii_bus->phy_map[phy_addr]->phy_id);
416
417        if (phydev == NULL)
418            phydev = re->mii_bus->phy_map[phy_addr];
419    }
420
421    if (!phydev) {
422        netdev_err(netdev, "no PHY found with phy_mask=%08x\n",
423               pdata->phy_mask);
424        return -ENODEV;
425    }
426
427    re->phy_dev = phy_connect(netdev, dev_name(&phydev->dev),
428                  ramips_phy_link_adjust, 0,
429                  pdata->phy_if_mode);
430
431    if (IS_ERR(re->phy_dev)) {
432        netdev_err(netdev, "could not connect to PHY at %s\n",
433               dev_name(&phydev->dev));
434        return PTR_ERR(re->phy_dev);
435    }
436
437    phydev->supported &= PHY_GBIT_FEATURES;
438    phydev->advertising = phydev->supported;
439
440    RADEBUG("%s: connected to PHY at %s [uid=%08x, driver=%s]\n",
441        netdev->name, dev_name(&phydev->dev),
442        phydev->phy_id, phydev->drv->name);
443
444    re->link = 0;
445    re->speed = 0;
446    re->duplex = -1;
447    re->rx_fc = 0;
448    re->tx_fc = 0;
449
450    return ret;
451}
452
453static int
454ramips_phy_connect_fixed(struct raeth_priv *re)
455{
456    struct ramips_eth_platform_data *pdata;
457
458    pdata = re->parent->platform_data;
459    switch (pdata->speed) {
460    case SPEED_10:
461    case SPEED_100:
462    case SPEED_1000:
463        break;
464    default:
465        netdev_err(re->netdev, "invalid speed specified\n");
466        return -EINVAL;
467    }
468
469    RADEBUG("%s: using fixed link parameters\n", re->netdev->name);
470
471    re->speed = pdata->speed;
472    re->duplex = pdata->duplex;
473    re->tx_fc = pdata->tx_fc;
474    re->rx_fc = pdata->tx_fc;
475
476    return 0;
477}
478
479static int
480ramips_phy_connect(struct raeth_priv *re)
481{
482    struct ramips_eth_platform_data *pdata;
483
484    pdata = re->parent->platform_data;
485    if (pdata->phy_mask)
486        return ramips_phy_connect_multi(re);
487
488    return ramips_phy_connect_fixed(re);
489}
490
491static void
492ramips_phy_disconnect(struct raeth_priv *re)
493{
494    if (re->phy_dev)
495        phy_disconnect(re->phy_dev);
496}
497
498static void
499ramips_phy_start(struct raeth_priv *re)
500{
501    unsigned long flags;
502
503    if (re->phy_dev) {
504        phy_start(re->phy_dev);
505    } else {
506        spin_lock_irqsave(&re->phy_lock, flags);
507        re->link = 1;
508        ramips_link_adjust(re);
509        spin_unlock_irqrestore(&re->phy_lock, flags);
510    }
511}
512
513static void
514ramips_phy_stop(struct raeth_priv *re)
515{
516    unsigned long flags;
517
518    if (re->phy_dev)
519        phy_stop(re->phy_dev);
520
521    spin_lock_irqsave(&re->phy_lock, flags);
522    re->link = 0;
523    ramips_link_adjust(re);
524    spin_unlock_irqrestore(&re->phy_lock, flags);
525}
526#else
527static inline int
528ramips_mdio_init(struct raeth_priv *re)
529{
530    return 0;
531}
532
533static inline void
534ramips_mdio_cleanup(struct raeth_priv *re)
535{
536}
537
538static inline int
539ramips_phy_connect(struct raeth_priv *re)
540{
541    return 0;
542}
543
544static inline void
545ramips_phy_disconnect(struct raeth_priv *re)
546{
547}
548
549static inline void
550ramips_phy_start(struct raeth_priv *re)
551{
552}
553
554static inline void
555ramips_phy_stop(struct raeth_priv *re)
556{
557}
558#endif /* CONFIG_RALINK_RT288X || CONFIG_RALINK_RT3883 */
559
560static void
561ramips_ring_free(struct raeth_priv *re)
562{
563    int len;
564    int i;
565
566    if (re->rx_info) {
567        for (i = 0; i < NUM_RX_DESC; i++) {
568            struct raeth_rx_info *rxi;
569
570            rxi = &re->rx_info[i];
571            if (rxi->rx_skb)
572                dev_kfree_skb_any(rxi->rx_skb);
573        }
574        kfree(re->rx_info);
575    }
576
577    if (re->rx) {
578        len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
579        dma_free_coherent(&re->netdev->dev, len, re->rx,
580                  re->rx_desc_dma);
581    }
582
583    if (re->tx) {
584        len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
585        dma_free_coherent(&re->netdev->dev, len, re->tx,
586                  re->tx_desc_dma);
587    }
588
589    kfree(re->tx_info);
590}
591
592static int
593ramips_ring_alloc(struct raeth_priv *re)
594{
595    int len;
596    int err = -ENOMEM;
597    int i;
598
599    re->tx_info = kzalloc(NUM_TX_DESC * sizeof(struct raeth_tx_info),
600                  GFP_ATOMIC);
601    if (!re->tx_info)
602        goto err_cleanup;
603
604    re->rx_info = kzalloc(NUM_RX_DESC * sizeof(struct raeth_rx_info),
605                  GFP_ATOMIC);
606    if (!re->rx_info)
607        goto err_cleanup;
608
609    /* allocate tx ring */
610    len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
611    re->tx = dma_alloc_coherent(&re->netdev->dev, len,
612                      &re->tx_desc_dma, GFP_ATOMIC);
613    if (!re->tx)
614        goto err_cleanup;
615
616    /* allocate rx ring */
617    len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
618    re->rx = dma_alloc_coherent(&re->netdev->dev, len,
619                    &re->rx_desc_dma, GFP_ATOMIC);
620    if (!re->rx)
621        goto err_cleanup;
622
623    for (i = 0; i < NUM_RX_DESC; i++) {
624        struct sk_buff *skb;
625
626        skb = ramips_alloc_skb(re);
627        if (!skb)
628            goto err_cleanup;
629
630        re->rx_info[i].rx_skb = skb;
631    }
632
633    return 0;
634
635err_cleanup:
636    ramips_ring_free(re);
637    return err;
638}
639
640static void
641ramips_setup_dma(struct raeth_priv *re)
642{
643    ramips_fe_wr(re->tx_desc_dma, RAMIPS_TX_BASE_PTR0);
644    ramips_fe_wr(NUM_TX_DESC, RAMIPS_TX_MAX_CNT0);
645    ramips_fe_wr(0, RAMIPS_TX_CTX_IDX0);
646    ramips_fe_wr(RAMIPS_PST_DTX_IDX0, RAMIPS_PDMA_RST_CFG);
647
648    ramips_fe_wr(re->rx_desc_dma, RAMIPS_RX_BASE_PTR0);
649    ramips_fe_wr(NUM_RX_DESC, RAMIPS_RX_MAX_CNT0);
650    ramips_fe_wr((NUM_RX_DESC - 1), RAMIPS_RX_CALC_IDX0);
651    ramips_fe_wr(RAMIPS_PST_DRX_IDX0, RAMIPS_PDMA_RST_CFG);
652}
653
654static int
655ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
656{
657    struct raeth_priv *re = netdev_priv(dev);
658    struct raeth_tx_info *txi, *txi_next;
659    struct ramips_tx_dma *txd, *txd_next;
660    unsigned long tx;
661    unsigned int tx_next;
662    dma_addr_t mapped_addr;
663
664    if (re->plat->min_pkt_len) {
665        if (skb->len < re->plat->min_pkt_len) {
666            if (skb_padto(skb, re->plat->min_pkt_len)) {
667                printk(KERN_ERR
668                       "ramips_eth: skb_padto failed\n");
669                kfree_skb(skb);
670                return 0;
671            }
672            skb_put(skb, re->plat->min_pkt_len - skb->len);
673        }
674    }
675
676    dev->trans_start = jiffies;
677    mapped_addr = dma_map_single(&re->netdev->dev, skb->data, skb->len,
678                     DMA_TO_DEVICE);
679
680    spin_lock(&re->page_lock);
681    tx = ramips_fe_rr(RAMIPS_TX_CTX_IDX0);
682    tx_next = (tx + 1) % NUM_TX_DESC;
683
684    txi = &re->tx_info[tx];
685    txd = txi->tx_desc;
686    txi_next = &re->tx_info[tx_next];
687    txd_next = txi_next->tx_desc;
688
689    if ((txi->tx_skb) || (txi_next->tx_skb) ||
690        !(txd->txd2 & TX_DMA_DONE) ||
691        !(txd_next->txd2 & TX_DMA_DONE))
692        goto out;
693
694    txi->tx_skb = skb;
695
696    txd->txd1 = (unsigned int) mapped_addr;
697    wmb();
698    txd->txd2 = TX_DMA_LSO | TX_DMA_PLEN0(skb->len);
699    dev->stats.tx_packets++;
700    dev->stats.tx_bytes += skb->len;
701    ramips_fe_wr(tx_next, RAMIPS_TX_CTX_IDX0);
702    spin_unlock(&re->page_lock);
703    return NETDEV_TX_OK;
704
705 out:
706    spin_unlock(&re->page_lock);
707    dev->stats.tx_dropped++;
708    kfree_skb(skb);
709    return NETDEV_TX_OK;
710}
711
712static void
713ramips_eth_rx_hw(unsigned long ptr)
714{
715    struct net_device *dev = (struct net_device *) ptr;
716    struct raeth_priv *re = netdev_priv(dev);
717    int rx;
718    int max_rx = 16;
719
720    rx = ramips_fe_rr(RAMIPS_RX_CALC_IDX0);
721
722    while (max_rx) {
723        struct raeth_rx_info *rxi;
724        struct ramips_rx_dma *rxd;
725        struct sk_buff *rx_skb, *new_skb;
726        int pktlen;
727
728        rx = (rx + 1) % NUM_RX_DESC;
729
730        rxi = &re->rx_info[rx];
731        rxd = rxi->rx_desc;
732        if (!(rxd->rxd2 & RX_DMA_DONE))
733            break;
734
735        rx_skb = rxi->rx_skb;
736        pktlen = RX_DMA_PLEN0(rxd->rxd2);
737
738        new_skb = ramips_alloc_skb(re);
739        /* Reuse the buffer on allocation failures */
740        if (new_skb) {
741            dma_addr_t dma_addr;
742
743            dma_unmap_single(&re->netdev->dev, rxi->rx_dma,
744                     MAX_RX_LENGTH, DMA_FROM_DEVICE);
745
746            skb_put(rx_skb, pktlen);
747            rx_skb->dev = dev;
748            rx_skb->protocol = eth_type_trans(rx_skb, dev);
749            rx_skb->ip_summed = CHECKSUM_NONE;
750            dev->stats.rx_packets++;
751            dev->stats.rx_bytes += pktlen;
752            netif_rx(rx_skb);
753
754            rxi->rx_skb = new_skb;
755
756            dma_addr = dma_map_single(&re->netdev->dev,
757                          new_skb->data,
758                          MAX_RX_LENGTH,
759                          DMA_FROM_DEVICE);
760            rxi->rx_dma = dma_addr;
761            rxd->rxd1 = (unsigned int) dma_addr;
762            wmb();
763        } else {
764            dev->stats.rx_dropped++;
765        }
766
767        rxd->rxd2 = RX_DMA_LSO;
768        ramips_fe_wr(rx, RAMIPS_RX_CALC_IDX0);
769        max_rx--;
770    }
771
772    if (max_rx == 0)
773        tasklet_schedule(&re->rx_tasklet);
774    else
775        ramips_fe_int_enable(RAMIPS_RX_DLY_INT);
776}
777
778static void
779ramips_eth_tx_housekeeping(unsigned long ptr)
780{
781    struct net_device *dev = (struct net_device*)ptr;
782    struct raeth_priv *re = netdev_priv(dev);
783
784    spin_lock(&re->page_lock);
785    while (1) {
786        struct raeth_tx_info *txi;
787        struct ramips_tx_dma *txd;
788
789        txi = &re->tx_info[re->skb_free_idx];
790        txd = txi->tx_desc;
791
792        if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb))
793            break;
794
795        dev_kfree_skb_irq(txi->tx_skb);
796        txi->tx_skb = NULL;
797        re->skb_free_idx++;
798        if (re->skb_free_idx >= NUM_TX_DESC)
799            re->skb_free_idx = 0;
800    }
801    spin_unlock(&re->page_lock);
802
803    ramips_fe_int_enable(RAMIPS_TX_DLY_INT);
804}
805
806static void
807ramips_eth_timeout(struct net_device *dev)
808{
809    struct raeth_priv *re = netdev_priv(dev);
810
811    tasklet_schedule(&re->tx_housekeeping_tasklet);
812}
813
814static irqreturn_t
815ramips_eth_irq(int irq, void *dev)
816{
817    struct raeth_priv *re = netdev_priv(dev);
818    unsigned int status;
819
820    status = ramips_fe_rr(RAMIPS_FE_INT_STATUS);
821    status &= ramips_fe_rr(RAMIPS_FE_INT_ENABLE);
822
823    if (!status)
824        return IRQ_NONE;
825
826    ramips_fe_wr(status, RAMIPS_FE_INT_STATUS);
827
828    if (status & RAMIPS_RX_DLY_INT) {
829        ramips_fe_int_disable(RAMIPS_RX_DLY_INT);
830        tasklet_schedule(&re->rx_tasklet);
831    }
832
833    if (status & RAMIPS_TX_DLY_INT) {
834        ramips_fe_int_disable(RAMIPS_TX_DLY_INT);
835        tasklet_schedule(&re->tx_housekeeping_tasklet);
836    }
837
838    raeth_debugfs_update_int_stats(re, status);
839
840    return IRQ_HANDLED;
841}
842
843static int
844ramips_eth_open(struct net_device *dev)
845{
846    struct raeth_priv *re = netdev_priv(dev);
847    int err;
848
849    err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
850              dev->name, dev);
851    if (err)
852        return err;
853
854    err = ramips_ring_alloc(re);
855    if (err)
856        goto err_free_irq;
857
858    ramips_ring_setup(re);
859    ramips_hw_set_macaddr(dev->dev_addr);
860
861    ramips_setup_dma(re);
862    ramips_fe_wr((ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) & 0xff) |
863        (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
864        RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
865        RAMIPS_PDMA_GLO_CFG);
866    ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
867        ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
868        ((re->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
869        RAMIPS_FE_GLO_CFG);
870
871    tasklet_init(&re->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
872             (unsigned long)dev);
873    tasklet_init(&re->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
874
875    ramips_phy_start(re);
876
877    ramips_fe_wr(RAMIPS_DELAY_INIT, RAMIPS_DLY_INT_CFG);
878    ramips_fe_wr(RAMIPS_TX_DLY_INT | RAMIPS_RX_DLY_INT, RAMIPS_FE_INT_ENABLE);
879    ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
880        ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
881        RAMIPS_GDMA1_FWD_CFG);
882    ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
883        ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
884        RAMIPS_CDMA_CSG_CFG);
885    ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
886    ramips_fe_wr(1, RAMIPS_FE_RST_GL);
887    ramips_fe_wr(0, RAMIPS_FE_RST_GL);
888
889    netif_start_queue(dev);
890    return 0;
891
892 err_free_irq:
893    free_irq(dev->irq, dev);
894    return err;
895}
896
897static int
898ramips_eth_stop(struct net_device *dev)
899{
900    struct raeth_priv *re = netdev_priv(dev);
901
902    ramips_fe_wr(ramips_fe_rr(RAMIPS_PDMA_GLO_CFG) &
903             ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
904             RAMIPS_PDMA_GLO_CFG);
905
906    /* disable all interrupts in the hw */
907    ramips_fe_wr(0, RAMIPS_FE_INT_ENABLE);
908
909    ramips_phy_stop(re);
910    free_irq(dev->irq, dev);
911    netif_stop_queue(dev);
912    tasklet_kill(&re->tx_housekeeping_tasklet);
913    tasklet_kill(&re->rx_tasklet);
914    ramips_ring_cleanup(re);
915    ramips_ring_free(re);
916    RADEBUG("ramips_eth: stopped\n");
917    return 0;
918}
919
920static int __init
921ramips_eth_probe(struct net_device *dev)
922{
923    struct raeth_priv *re = netdev_priv(dev);
924    int err;
925
926    BUG_ON(!re->plat->reset_fe);
927    re->plat->reset_fe();
928    net_srandom(jiffies);
929    memcpy(dev->dev_addr, re->plat->mac, ETH_ALEN);
930
931    ether_setup(dev);
932    dev->mtu = 1500;
933    dev->watchdog_timeo = TX_TIMEOUT;
934    spin_lock_init(&re->page_lock);
935    spin_lock_init(&re->phy_lock);
936
937    err = ramips_mdio_init(re);
938    if (err)
939        return err;
940
941    err = ramips_phy_connect(re);
942    if (err)
943        goto err_mdio_cleanup;
944
945    err = raeth_debugfs_init(re);
946    if (err)
947        goto err_phy_disconnect;
948
949    return 0;
950
951err_phy_disconnect:
952    ramips_phy_disconnect(re);
953err_mdio_cleanup:
954    ramips_mdio_cleanup(re);
955    return err;
956}
957
958static void
959ramips_eth_uninit(struct net_device *dev)
960{
961    struct raeth_priv *re = netdev_priv(dev);
962
963    raeth_debugfs_exit(re);
964    ramips_phy_disconnect(re);
965    ramips_mdio_cleanup(re);
966}
967
968static const struct net_device_ops ramips_eth_netdev_ops = {
969    .ndo_init = ramips_eth_probe,
970    .ndo_uninit = ramips_eth_uninit,
971    .ndo_open = ramips_eth_open,
972    .ndo_stop = ramips_eth_stop,
973    .ndo_start_xmit = ramips_eth_hard_start_xmit,
974    .ndo_tx_timeout = ramips_eth_timeout,
975    .ndo_change_mtu = eth_change_mtu,
976    .ndo_set_mac_address = eth_mac_addr,
977    .ndo_validate_addr = eth_validate_addr,
978};
979
980static int
981ramips_eth_plat_probe(struct platform_device *plat)
982{
983    struct raeth_priv *re;
984    struct ramips_eth_platform_data *data = plat->dev.platform_data;
985    struct resource *res;
986    int err;
987
988    if (!data) {
989        dev_err(&plat->dev, "no platform data specified\n");
990        return -EINVAL;
991    }
992
993    res = platform_get_resource(plat, IORESOURCE_MEM, 0);
994    if (!res) {
995        dev_err(&plat->dev, "no memory resource found\n");
996        return -ENXIO;
997    }
998
999    ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
1000    if (!ramips_fe_base)
1001        return -ENOMEM;
1002
1003    ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
1004    if (!ramips_dev) {
1005        dev_err(&plat->dev, "alloc_etherdev failed\n");
1006        err = -ENOMEM;
1007        goto err_unmap;
1008    }
1009
1010    strcpy(ramips_dev->name, "eth%d");
1011    ramips_dev->irq = platform_get_irq(plat, 0);
1012    if (ramips_dev->irq < 0) {
1013        dev_err(&plat->dev, "no IRQ resource found\n");
1014        err = -ENXIO;
1015        goto err_free_dev;
1016    }
1017    ramips_dev->addr_len = ETH_ALEN;
1018    ramips_dev->base_addr = (unsigned long)ramips_fe_base;
1019    ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
1020
1021    re = netdev_priv(ramips_dev);
1022
1023    re->netdev = ramips_dev;
1024    re->parent = &plat->dev;
1025    re->speed = data->speed;
1026    re->duplex = data->duplex;
1027    re->rx_fc = data->rx_fc;
1028    re->tx_fc = data->tx_fc;
1029    re->plat = data;
1030
1031    err = register_netdev(ramips_dev);
1032    if (err) {
1033        dev_err(&plat->dev, "error bringing up device\n");
1034        goto err_free_dev;
1035    }
1036
1037    RADEBUG("ramips_eth: loaded\n");
1038    return 0;
1039
1040 err_free_dev:
1041    kfree(ramips_dev);
1042 err_unmap:
1043    iounmap(ramips_fe_base);
1044    return err;
1045}
1046
1047static int
1048ramips_eth_plat_remove(struct platform_device *plat)
1049{
1050    unregister_netdev(ramips_dev);
1051    free_netdev(ramips_dev);
1052    RADEBUG("ramips_eth: unloaded\n");
1053    return 0;
1054}
1055
1056static struct platform_driver ramips_eth_driver = {
1057    .probe = ramips_eth_plat_probe,
1058    .remove = ramips_eth_plat_remove,
1059    .driver = {
1060        .name = "ramips_eth",
1061        .owner = THIS_MODULE,
1062    },
1063};
1064
1065static int __init
1066ramips_eth_init(void)
1067{
1068    int ret;
1069
1070    ret = raeth_debugfs_root_init();
1071    if (ret)
1072        goto err_out;
1073
1074    ret = rt305x_esw_init();
1075    if (ret)
1076        goto err_debugfs_exit;
1077
1078    ret = platform_driver_register(&ramips_eth_driver);
1079    if (ret) {
1080        printk(KERN_ERR
1081               "ramips_eth: Error registering platfom driver!\n");
1082        goto esw_cleanup;
1083    }
1084
1085    return 0;
1086
1087esw_cleanup:
1088    rt305x_esw_exit();
1089err_debugfs_exit:
1090    raeth_debugfs_root_exit();
1091err_out:
1092    return ret;
1093}
1094
1095static void __exit
1096ramips_eth_cleanup(void)
1097{
1098    platform_driver_unregister(&ramips_eth_driver);
1099    rt305x_esw_exit();
1100    raeth_debugfs_root_exit();
1101}
1102
1103module_init(ramips_eth_init);
1104module_exit(ramips_eth_cleanup);
1105
1106MODULE_LICENSE("GPL");
1107MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
1108MODULE_DESCRIPTION("ethernet driver for ramips boards");
1109

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