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 <rt305x.h>
37#include "ramips_esw.c"
38#else
39static inline int rt305x_esw_init(void) { return 0; }
40static inline void rt305x_esw_exit(void) { }
41static inline int soc_is_rt5350(void) { return 0; }
42#endif
43
44#define phys_to_bus(a) (a & 0x1FFFFFFF)
45
46#ifdef CONFIG_NET_RAMIPS_DEBUG
47#define RADEBUG(fmt, args...) printk(KERN_DEBUG fmt, ## args)
48#else
49#define RADEBUG(fmt, args...) do {} while (0)
50#endif
51
52#define RX_DLY_INT ((soc_is_rt5350())?(RT5350_RX_DLY_INT):(RAMIPS_RX_DLY_INT))
53#define TX_DLY_INT ((soc_is_rt5350())?(RT5350_TX_DLY_INT):(RAMIPS_TX_DLY_INT))
54
55enum raeth_reg {
56    RAETH_REG_PDMA_GLO_CFG = 0,
57    RAETH_REG_PDMA_RST_CFG,
58    RAETH_REG_DLY_INT_CFG,
59    RAETH_REG_TX_BASE_PTR0,
60    RAETH_REG_TX_MAX_CNT0,
61    RAETH_REG_TX_CTX_IDX0,
62    RAETH_REG_RX_BASE_PTR0,
63    RAETH_REG_RX_MAX_CNT0,
64    RAETH_REG_RX_CALC_IDX0,
65    RAETH_REG_FE_INT_ENABLE,
66    RAETH_REG_FE_INT_STATUS,
67    RAETH_REG_COUNT
68};
69
70static const u32 ramips_reg_table[RAETH_REG_COUNT] = {
71    [RAETH_REG_PDMA_GLO_CFG] = RAMIPS_PDMA_GLO_CFG,
72    [RAETH_REG_PDMA_RST_CFG] = RAMIPS_PDMA_RST_CFG,
73    [RAETH_REG_DLY_INT_CFG] = RAMIPS_DLY_INT_CFG,
74    [RAETH_REG_TX_BASE_PTR0] = RAMIPS_TX_BASE_PTR0,
75    [RAETH_REG_TX_MAX_CNT0] = RAMIPS_TX_MAX_CNT0,
76    [RAETH_REG_TX_CTX_IDX0] = RAMIPS_TX_CTX_IDX0,
77    [RAETH_REG_RX_BASE_PTR0] = RAMIPS_RX_BASE_PTR0,
78    [RAETH_REG_RX_MAX_CNT0] = RAMIPS_RX_MAX_CNT0,
79    [RAETH_REG_RX_CALC_IDX0] = RAMIPS_RX_CALC_IDX0,
80    [RAETH_REG_FE_INT_ENABLE] = RAMIPS_FE_INT_ENABLE,
81    [RAETH_REG_FE_INT_STATUS] = RAMIPS_FE_INT_STATUS,
82};
83
84static const u32 rt5350_reg_table[RAETH_REG_COUNT] = {
85    [RAETH_REG_PDMA_GLO_CFG] = RT5350_PDMA_GLO_CFG,
86    [RAETH_REG_PDMA_RST_CFG] = RT5350_PDMA_RST_CFG,
87    [RAETH_REG_DLY_INT_CFG] = RT5350_DLY_INT_CFG,
88    [RAETH_REG_TX_BASE_PTR0] = RT5350_TX_BASE_PTR0,
89    [RAETH_REG_TX_MAX_CNT0] = RT5350_TX_MAX_CNT0,
90    [RAETH_REG_TX_CTX_IDX0] = RT5350_TX_CTX_IDX0,
91    [RAETH_REG_RX_BASE_PTR0] = RT5350_RX_BASE_PTR0,
92    [RAETH_REG_RX_MAX_CNT0] = RT5350_RX_MAX_CNT0,
93    [RAETH_REG_RX_CALC_IDX0] = RT5350_RX_CALC_IDX0,
94    [RAETH_REG_FE_INT_ENABLE] = RT5350_FE_INT_ENABLE,
95    [RAETH_REG_FE_INT_STATUS] = RT5350_FE_INT_STATUS,
96};
97
98static struct net_device * ramips_dev;
99static void __iomem *ramips_fe_base = 0;
100
101static inline u32 get_reg_offset(enum raeth_reg reg)
102{
103    const u32 *table;
104
105    if (soc_is_rt5350())
106        table = rt5350_reg_table;
107    else
108        table = ramips_reg_table;
109
110    return table[reg];
111}
112
113static inline void
114ramips_fe_wr(u32 val, unsigned reg)
115{
116    __raw_writel(val, ramips_fe_base + reg);
117}
118
119static inline u32
120ramips_fe_rr(unsigned reg)
121{
122    return __raw_readl(ramips_fe_base + reg);
123}
124
125static inline void
126ramips_fe_twr(u32 val, enum raeth_reg reg)
127{
128    ramips_fe_wr(val, get_reg_offset(reg));
129}
130
131static inline u32
132ramips_fe_trr(enum raeth_reg reg)
133{
134    return ramips_fe_rr(get_reg_offset(reg));
135}
136
137static inline void
138ramips_fe_int_disable(u32 mask)
139{
140    ramips_fe_twr(ramips_fe_trr(RAETH_REG_FE_INT_ENABLE) & ~mask,
141             RAETH_REG_FE_INT_ENABLE);
142    /* flush write */
143    ramips_fe_trr(RAETH_REG_FE_INT_ENABLE);
144}
145
146static inline void
147ramips_fe_int_enable(u32 mask)
148{
149    ramips_fe_twr(ramips_fe_trr(RAETH_REG_FE_INT_ENABLE) | mask,
150             RAETH_REG_FE_INT_ENABLE);
151    /* flush write */
152    ramips_fe_trr(RAETH_REG_FE_INT_ENABLE);
153}
154
155static inline void
156ramips_hw_set_macaddr(unsigned char *mac)
157{
158    if (soc_is_rt5350()) {
159        ramips_fe_wr((mac[0] << 8) | mac[1], RT5350_SDM_MAC_ADRH);
160        ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
161                 RT5350_SDM_MAC_ADRL);
162    } else {
163        ramips_fe_wr((mac[0] << 8) | mac[1], RAMIPS_GDMA1_MAC_ADRH);
164        ramips_fe_wr((mac[2] << 24) | (mac[3] << 16) | (mac[4] << 8) | mac[5],
165                 RAMIPS_GDMA1_MAC_ADRL);
166    }
167}
168
169static struct sk_buff *
170ramips_alloc_skb(struct raeth_priv *re)
171{
172    struct sk_buff *skb;
173
174    skb = netdev_alloc_skb(re->netdev, MAX_RX_LENGTH + NET_IP_ALIGN);
175    if (!skb)
176        return NULL;
177
178    skb_reserve(skb, NET_IP_ALIGN);
179
180    return skb;
181}
182
183static void
184ramips_ring_setup(struct raeth_priv *re)
185{
186    int len;
187    int i;
188
189    memset(re->tx_info, 0, NUM_TX_DESC * sizeof(struct raeth_tx_info));
190
191    len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
192    memset(re->tx, 0, len);
193
194    for (i = 0; i < NUM_TX_DESC; i++) {
195        struct raeth_tx_info *txi;
196        struct ramips_tx_dma *txd;
197
198        txd = &re->tx[i];
199        txd->txd4 = TX_DMA_QN(3) | TX_DMA_PN(1);
200        txd->txd2 = TX_DMA_LSO | TX_DMA_DONE;
201
202        txi = &re->tx_info[i];
203        txi->tx_desc = txd;
204        if (txi->tx_skb != NULL) {
205            netdev_warn(re->netdev,
206                    "dirty skb for TX desc %d\n", i);
207            txi->tx_skb = NULL;
208        }
209    }
210
211    len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
212    memset(re->rx, 0, len);
213
214    for (i = 0; i < NUM_RX_DESC; i++) {
215        struct raeth_rx_info *rxi;
216        struct ramips_rx_dma *rxd;
217        dma_addr_t dma_addr;
218
219        rxd = &re->rx[i];
220        rxi = &re->rx_info[i];
221        BUG_ON(rxi->rx_skb == NULL);
222        dma_addr = dma_map_single(&re->netdev->dev, rxi->rx_skb->data,
223                      MAX_RX_LENGTH, DMA_FROM_DEVICE);
224        rxi->rx_dma = dma_addr;
225        rxi->rx_desc = rxd;
226
227        rxd->rxd1 = (unsigned int) dma_addr;
228        rxd->rxd2 = RX_DMA_LSO;
229    }
230
231    /* flush descriptors */
232    wmb();
233}
234
235static void
236ramips_ring_cleanup(struct raeth_priv *re)
237{
238    int i;
239
240    for (i = 0; i < NUM_RX_DESC; i++) {
241        struct raeth_rx_info *rxi;
242
243        rxi = &re->rx_info[i];
244        if (rxi->rx_skb)
245            dma_unmap_single(&re->netdev->dev, rxi->rx_dma,
246                     MAX_RX_LENGTH, DMA_FROM_DEVICE);
247    }
248
249    for (i = 0; i < NUM_TX_DESC; i++) {
250        struct raeth_tx_info *txi;
251
252        txi = &re->tx_info[i];
253        if (txi->tx_skb) {
254            dev_kfree_skb_any(txi->tx_skb);
255            txi->tx_skb = NULL;
256        }
257    }
258
259    netdev_reset_queue(re->netdev);
260}
261
262#if defined(CONFIG_RALINK_RT288X) || defined(CONFIG_RALINK_RT3883)
263
264#define RAMIPS_MDIO_RETRY 1000
265
266static unsigned char *ramips_speed_str(struct raeth_priv *re)
267{
268    switch (re->speed) {
269    case SPEED_1000:
270        return "1000";
271    case SPEED_100:
272        return "100";
273    case SPEED_10:
274        return "10";
275    }
276
277    return "?";
278}
279
280static void ramips_link_adjust(struct raeth_priv *re)
281{
282    struct ramips_eth_platform_data *pdata;
283    u32 mdio_cfg;
284
285    pdata = re->parent->platform_data;
286    if (!re->link) {
287        netif_carrier_off(re->netdev);
288        netdev_info(re->netdev, "link down\n");
289        return;
290    }
291
292    mdio_cfg = RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
293           RAMIPS_MDIO_CFG_TX_CLK_SKEW_200 |
294           RAMIPS_MDIO_CFG_GP1_FRC_EN;
295
296    if (re->duplex == DUPLEX_FULL)
297        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_DUPLEX;
298
299    if (re->tx_fc)
300        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_TX;
301
302    if (re->rx_fc)
303        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_FC_RX;
304
305    switch (re->speed) {
306    case SPEED_10:
307        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_10;
308        break;
309    case SPEED_100:
310        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_100;
311        break;
312    case SPEED_1000:
313        mdio_cfg |= RAMIPS_MDIO_CFG_GP1_SPEED_1000;
314        break;
315    default:
316        BUG();
317    }
318
319    ramips_fe_wr(mdio_cfg, RAMIPS_MDIO_CFG);
320
321    netif_carrier_on(re->netdev);
322    netdev_info(re->netdev, "link up (%sMbps/%s duplex)\n",
323            ramips_speed_str(re),
324            (DUPLEX_FULL == re->duplex) ? "Full" : "Half");
325}
326
327static int
328ramips_mdio_wait_ready(struct raeth_priv *re)
329{
330    int retries;
331
332    retries = RAMIPS_MDIO_RETRY;
333    while (1) {
334        u32 t;
335
336        t = ramips_fe_rr(RAMIPS_MDIO_ACCESS);
337        if ((t & (0x1 << 31)) == 0)
338            return 0;
339
340        if (retries-- == 0)
341            break;
342
343        udelay(1);
344    }
345
346    dev_err(re->parent, "MDIO operation timed out\n");
347    return -ETIMEDOUT;
348}
349
350static int
351ramips_mdio_read(struct mii_bus *bus, int phy_addr, int phy_reg)
352{
353    struct raeth_priv *re = bus->priv;
354    int err;
355    u32 t;
356
357    err = ramips_mdio_wait_ready(re);
358    if (err)
359        return 0xffff;
360
361    t = (phy_addr << 24) | (phy_reg << 16);
362    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
363    t |= (1 << 31);
364    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
365
366    err = ramips_mdio_wait_ready(re);
367    if (err)
368        return 0xffff;
369
370    RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
371        phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
372
373    return ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff;
374}
375
376static int
377ramips_mdio_write(struct mii_bus *bus, int phy_addr, int phy_reg, u16 val)
378{
379    struct raeth_priv *re = bus->priv;
380    int err;
381    u32 t;
382
383    RADEBUG("%s: addr=%04x, reg=%04x, value=%04x\n", __func__,
384        phy_addr, phy_reg, ramips_fe_rr(RAMIPS_MDIO_ACCESS) & 0xffff);
385
386    err = ramips_mdio_wait_ready(re);
387    if (err)
388        return err;
389
390    t = (1 << 30) | (phy_addr << 24) | (phy_reg << 16) | val;
391    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
392    t |= (1 << 31);
393    ramips_fe_wr(t, RAMIPS_MDIO_ACCESS);
394
395    return ramips_mdio_wait_ready(re);
396}
397
398static int
399ramips_mdio_reset(struct mii_bus *bus)
400{
401    /* TODO */
402    return 0;
403}
404
405static int
406ramips_mdio_init(struct raeth_priv *re)
407{
408    int err;
409    int i;
410
411    re->mii_bus = mdiobus_alloc();
412    if (re->mii_bus == NULL)
413        return -ENOMEM;
414
415    re->mii_bus->name = "ramips_mdio";
416    re->mii_bus->read = ramips_mdio_read;
417    re->mii_bus->write = ramips_mdio_write;
418    re->mii_bus->reset = ramips_mdio_reset;
419    re->mii_bus->irq = re->mii_irq;
420    re->mii_bus->priv = re;
421    re->mii_bus->parent = re->parent;
422
423    snprintf(re->mii_bus->id, MII_BUS_ID_SIZE, "%s", "ramips_mdio");
424    re->mii_bus->phy_mask = 0;
425
426    for (i = 0; i < PHY_MAX_ADDR; i++)
427        re->mii_irq[i] = PHY_POLL;
428
429    err = mdiobus_register(re->mii_bus);
430    if (err)
431        goto err_free_bus;
432
433    return 0;
434
435err_free_bus:
436    kfree(re->mii_bus);
437    return err;
438}
439
440static void
441ramips_mdio_cleanup(struct raeth_priv *re)
442{
443    mdiobus_unregister(re->mii_bus);
444    kfree(re->mii_bus);
445}
446
447static void
448ramips_phy_link_adjust(struct net_device *dev)
449{
450    struct raeth_priv *re = netdev_priv(dev);
451    struct phy_device *phydev = re->phy_dev;
452    unsigned long flags;
453    int status_change = 0;
454
455    spin_lock_irqsave(&re->phy_lock, flags);
456
457    if (phydev->link)
458        if (re->duplex != phydev->duplex ||
459            re->speed != phydev->speed)
460            status_change = 1;
461
462    if (phydev->link != re->link)
463        status_change = 1;
464
465    re->link = phydev->link;
466    re->duplex = phydev->duplex;
467    re->speed = phydev->speed;
468
469    if (status_change)
470        ramips_link_adjust(re);
471
472    spin_unlock_irqrestore(&re->phy_lock, flags);
473}
474
475static int
476ramips_phy_connect_multi(struct raeth_priv *re)
477{
478    struct net_device *netdev = re->netdev;
479    struct ramips_eth_platform_data *pdata;
480    struct phy_device *phydev = NULL;
481    int phy_addr;
482    int ret = 0;
483
484    pdata = re->parent->platform_data;
485    for (phy_addr = 0; phy_addr < PHY_MAX_ADDR; phy_addr++) {
486        if (!(pdata->phy_mask & (1 << phy_addr)))
487            continue;
488
489        if (re->mii_bus->phy_map[phy_addr] == NULL)
490            continue;
491
492        RADEBUG("%s: PHY found at %s, uid=%08x\n",
493            netdev->name,
494            dev_name(&re->mii_bus->phy_map[phy_addr]->dev),
495            re->mii_bus->phy_map[phy_addr]->phy_id);
496
497        if (phydev == NULL)
498            phydev = re->mii_bus->phy_map[phy_addr];
499    }
500
501    if (!phydev) {
502        netdev_err(netdev, "no PHY found with phy_mask=%08x\n",
503               pdata->phy_mask);
504        return -ENODEV;
505    }
506
507    re->phy_dev = phy_connect(netdev, dev_name(&phydev->dev),
508                  ramips_phy_link_adjust, 0,
509                  pdata->phy_if_mode);
510
511    if (IS_ERR(re->phy_dev)) {
512        netdev_err(netdev, "could not connect to PHY at %s\n",
513               dev_name(&phydev->dev));
514        return PTR_ERR(re->phy_dev);
515    }
516
517    phydev->supported &= PHY_GBIT_FEATURES;
518    phydev->advertising = phydev->supported;
519
520    RADEBUG("%s: connected to PHY at %s [uid=%08x, driver=%s]\n",
521        netdev->name, dev_name(&phydev->dev),
522        phydev->phy_id, phydev->drv->name);
523
524    re->link = 0;
525    re->speed = 0;
526    re->duplex = -1;
527    re->rx_fc = 0;
528    re->tx_fc = 0;
529
530    return ret;
531}
532
533static int
534ramips_phy_connect_fixed(struct raeth_priv *re)
535{
536    struct ramips_eth_platform_data *pdata;
537
538    pdata = re->parent->platform_data;
539    switch (pdata->speed) {
540    case SPEED_10:
541    case SPEED_100:
542    case SPEED_1000:
543        break;
544    default:
545        netdev_err(re->netdev, "invalid speed specified\n");
546        return -EINVAL;
547    }
548
549    RADEBUG("%s: using fixed link parameters\n", re->netdev->name);
550
551    re->speed = pdata->speed;
552    re->duplex = pdata->duplex;
553    re->tx_fc = pdata->tx_fc;
554    re->rx_fc = pdata->tx_fc;
555
556    return 0;
557}
558
559static int
560ramips_phy_connect(struct raeth_priv *re)
561{
562    struct ramips_eth_platform_data *pdata;
563
564    pdata = re->parent->platform_data;
565    if (pdata->phy_mask)
566        return ramips_phy_connect_multi(re);
567
568    return ramips_phy_connect_fixed(re);
569}
570
571static void
572ramips_phy_disconnect(struct raeth_priv *re)
573{
574    if (re->phy_dev)
575        phy_disconnect(re->phy_dev);
576}
577
578static void
579ramips_phy_start(struct raeth_priv *re)
580{
581    unsigned long flags;
582
583    if (re->phy_dev) {
584        phy_start(re->phy_dev);
585    } else {
586        spin_lock_irqsave(&re->phy_lock, flags);
587        re->link = 1;
588        ramips_link_adjust(re);
589        spin_unlock_irqrestore(&re->phy_lock, flags);
590    }
591}
592
593static void
594ramips_phy_stop(struct raeth_priv *re)
595{
596    unsigned long flags;
597
598    if (re->phy_dev)
599        phy_stop(re->phy_dev);
600
601    spin_lock_irqsave(&re->phy_lock, flags);
602    re->link = 0;
603    ramips_link_adjust(re);
604    spin_unlock_irqrestore(&re->phy_lock, flags);
605}
606#else
607static inline int
608ramips_mdio_init(struct raeth_priv *re)
609{
610    return 0;
611}
612
613static inline void
614ramips_mdio_cleanup(struct raeth_priv *re)
615{
616}
617
618static inline int
619ramips_phy_connect(struct raeth_priv *re)
620{
621    return 0;
622}
623
624static inline void
625ramips_phy_disconnect(struct raeth_priv *re)
626{
627}
628
629static inline void
630ramips_phy_start(struct raeth_priv *re)
631{
632}
633
634static inline void
635ramips_phy_stop(struct raeth_priv *re)
636{
637}
638#endif /* CONFIG_RALINK_RT288X || CONFIG_RALINK_RT3883 */
639
640static void
641ramips_ring_free(struct raeth_priv *re)
642{
643    int len;
644    int i;
645
646    if (re->rx_info) {
647        for (i = 0; i < NUM_RX_DESC; i++) {
648            struct raeth_rx_info *rxi;
649
650            rxi = &re->rx_info[i];
651            if (rxi->rx_skb)
652                dev_kfree_skb_any(rxi->rx_skb);
653        }
654        kfree(re->rx_info);
655    }
656
657    if (re->rx) {
658        len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
659        dma_free_coherent(&re->netdev->dev, len, re->rx,
660                  re->rx_desc_dma);
661    }
662
663    if (re->tx) {
664        len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
665        dma_free_coherent(&re->netdev->dev, len, re->tx,
666                  re->tx_desc_dma);
667    }
668
669    kfree(re->tx_info);
670}
671
672static int
673ramips_ring_alloc(struct raeth_priv *re)
674{
675    int len;
676    int err = -ENOMEM;
677    int i;
678
679    re->tx_info = kzalloc(NUM_TX_DESC * sizeof(struct raeth_tx_info),
680                  GFP_ATOMIC);
681    if (!re->tx_info)
682        goto err_cleanup;
683
684    re->rx_info = kzalloc(NUM_RX_DESC * sizeof(struct raeth_rx_info),
685                  GFP_ATOMIC);
686    if (!re->rx_info)
687        goto err_cleanup;
688
689    /* allocate tx ring */
690    len = NUM_TX_DESC * sizeof(struct ramips_tx_dma);
691    re->tx = dma_alloc_coherent(&re->netdev->dev, len,
692                      &re->tx_desc_dma, GFP_ATOMIC);
693    if (!re->tx)
694        goto err_cleanup;
695
696    /* allocate rx ring */
697    len = NUM_RX_DESC * sizeof(struct ramips_rx_dma);
698    re->rx = dma_alloc_coherent(&re->netdev->dev, len,
699                    &re->rx_desc_dma, GFP_ATOMIC);
700    if (!re->rx)
701        goto err_cleanup;
702
703    for (i = 0; i < NUM_RX_DESC; i++) {
704        struct sk_buff *skb;
705
706        skb = ramips_alloc_skb(re);
707        if (!skb)
708            goto err_cleanup;
709
710        re->rx_info[i].rx_skb = skb;
711    }
712
713    return 0;
714
715err_cleanup:
716    ramips_ring_free(re);
717    return err;
718}
719
720static void
721ramips_setup_dma(struct raeth_priv *re)
722{
723    ramips_fe_twr(re->tx_desc_dma, RAETH_REG_TX_BASE_PTR0);
724    ramips_fe_twr(NUM_TX_DESC, RAETH_REG_TX_MAX_CNT0);
725    ramips_fe_twr(0, RAETH_REG_TX_CTX_IDX0);
726    ramips_fe_twr(RAMIPS_PST_DTX_IDX0, RAETH_REG_PDMA_RST_CFG);
727
728    ramips_fe_twr(re->rx_desc_dma, RAETH_REG_RX_BASE_PTR0);
729    ramips_fe_twr(NUM_RX_DESC, RAETH_REG_RX_MAX_CNT0);
730    ramips_fe_twr((NUM_RX_DESC - 1), RAETH_REG_RX_CALC_IDX0);
731    ramips_fe_twr(RAMIPS_PST_DRX_IDX0, RAETH_REG_PDMA_RST_CFG);
732}
733
734static int
735ramips_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *dev)
736{
737    struct raeth_priv *re = netdev_priv(dev);
738    struct raeth_tx_info *txi, *txi_next;
739    struct ramips_tx_dma *txd, *txd_next;
740    unsigned long tx;
741    unsigned int tx_next;
742    dma_addr_t mapped_addr;
743
744    if (re->plat->min_pkt_len) {
745        if (skb->len < re->plat->min_pkt_len) {
746            if (skb_padto(skb, re->plat->min_pkt_len)) {
747                printk(KERN_ERR
748                       "ramips_eth: skb_padto failed\n");
749                kfree_skb(skb);
750                return 0;
751            }
752            skb_put(skb, re->plat->min_pkt_len - skb->len);
753        }
754    }
755
756    dev->trans_start = jiffies;
757    mapped_addr = dma_map_single(&re->netdev->dev, skb->data, skb->len,
758                     DMA_TO_DEVICE);
759
760    spin_lock(&re->page_lock);
761    tx = ramips_fe_trr(RAETH_REG_TX_CTX_IDX0);
762    tx_next = (tx + 1) % NUM_TX_DESC;
763
764    txi = &re->tx_info[tx];
765    txd = txi->tx_desc;
766    txi_next = &re->tx_info[tx_next];
767    txd_next = txi_next->tx_desc;
768
769    if ((txi->tx_skb) || (txi_next->tx_skb) ||
770        !(txd->txd2 & TX_DMA_DONE) ||
771        !(txd_next->txd2 & TX_DMA_DONE))
772        goto out;
773
774    txi->tx_skb = skb;
775
776    txd->txd1 = (unsigned int) mapped_addr;
777    wmb();
778    txd->txd2 = TX_DMA_LSO | TX_DMA_PLEN0(skb->len);
779    dev->stats.tx_packets++;
780    dev->stats.tx_bytes += skb->len;
781    ramips_fe_twr(tx_next, RAETH_REG_TX_CTX_IDX0);
782    netdev_sent_queue(dev, skb->len);
783    spin_unlock(&re->page_lock);
784    return NETDEV_TX_OK;
785
786 out:
787    spin_unlock(&re->page_lock);
788    dev->stats.tx_dropped++;
789    kfree_skb(skb);
790    return NETDEV_TX_OK;
791}
792
793static void
794ramips_eth_rx_hw(unsigned long ptr)
795{
796    struct net_device *dev = (struct net_device *) ptr;
797    struct raeth_priv *re = netdev_priv(dev);
798    int rx;
799    int max_rx = 16;
800
801    rx = ramips_fe_trr(RAETH_REG_RX_CALC_IDX0);
802
803    while (max_rx) {
804        struct raeth_rx_info *rxi;
805        struct ramips_rx_dma *rxd;
806        struct sk_buff *rx_skb, *new_skb;
807        int pktlen;
808
809        rx = (rx + 1) % NUM_RX_DESC;
810
811        rxi = &re->rx_info[rx];
812        rxd = rxi->rx_desc;
813        if (!(rxd->rxd2 & RX_DMA_DONE))
814            break;
815
816        rx_skb = rxi->rx_skb;
817        pktlen = RX_DMA_PLEN0(rxd->rxd2);
818
819        new_skb = ramips_alloc_skb(re);
820        /* Reuse the buffer on allocation failures */
821        if (new_skb) {
822            dma_addr_t dma_addr;
823
824            dma_unmap_single(&re->netdev->dev, rxi->rx_dma,
825                     MAX_RX_LENGTH, DMA_FROM_DEVICE);
826
827            skb_put(rx_skb, pktlen);
828            rx_skb->dev = dev;
829            rx_skb->protocol = eth_type_trans(rx_skb, dev);
830            rx_skb->ip_summed = CHECKSUM_NONE;
831            dev->stats.rx_packets++;
832            dev->stats.rx_bytes += pktlen;
833            netif_rx(rx_skb);
834
835            rxi->rx_skb = new_skb;
836
837            dma_addr = dma_map_single(&re->netdev->dev,
838                          new_skb->data,
839                          MAX_RX_LENGTH,
840                          DMA_FROM_DEVICE);
841            rxi->rx_dma = dma_addr;
842            rxd->rxd1 = (unsigned int) dma_addr;
843            wmb();
844        } else {
845            dev->stats.rx_dropped++;
846        }
847
848        rxd->rxd2 = RX_DMA_LSO;
849        ramips_fe_twr(rx, RAETH_REG_RX_CALC_IDX0);
850        max_rx--;
851    }
852
853    if (max_rx == 0)
854        tasklet_schedule(&re->rx_tasklet);
855    else
856        ramips_fe_int_enable(RX_DLY_INT);
857}
858
859static void
860ramips_eth_tx_housekeeping(unsigned long ptr)
861{
862    struct net_device *dev = (struct net_device*)ptr;
863    struct raeth_priv *re = netdev_priv(dev);
864    unsigned int bytes_compl = 0, pkts_compl = 0;
865
866    spin_lock(&re->page_lock);
867    while (1) {
868        struct raeth_tx_info *txi;
869        struct ramips_tx_dma *txd;
870
871        txi = &re->tx_info[re->skb_free_idx];
872        txd = txi->tx_desc;
873
874        if (!(txd->txd2 & TX_DMA_DONE) || !(txi->tx_skb))
875            break;
876
877        pkts_compl++;
878        bytes_compl += txi->tx_skb->len;
879
880        dev_kfree_skb_irq(txi->tx_skb);
881        txi->tx_skb = NULL;
882        re->skb_free_idx++;
883        if (re->skb_free_idx >= NUM_TX_DESC)
884            re->skb_free_idx = 0;
885    }
886    netdev_completed_queue(dev, pkts_compl, bytes_compl);
887    spin_unlock(&re->page_lock);
888
889    ramips_fe_int_enable(TX_DLY_INT);
890}
891
892static void
893ramips_eth_timeout(struct net_device *dev)
894{
895    struct raeth_priv *re = netdev_priv(dev);
896
897    tasklet_schedule(&re->tx_housekeeping_tasklet);
898}
899
900static irqreturn_t
901ramips_eth_irq(int irq, void *dev)
902{
903    struct raeth_priv *re = netdev_priv(dev);
904    unsigned int status;
905
906    status = ramips_fe_trr(RAETH_REG_FE_INT_STATUS);
907    status &= ramips_fe_trr(RAETH_REG_FE_INT_ENABLE);
908
909    if (!status)
910        return IRQ_NONE;
911
912    ramips_fe_twr(status, RAETH_REG_FE_INT_STATUS);
913
914    if (status & RX_DLY_INT) {
915        ramips_fe_int_disable(RX_DLY_INT);
916        tasklet_schedule(&re->rx_tasklet);
917    }
918
919    if (status & TX_DLY_INT) {
920        ramips_fe_int_disable(TX_DLY_INT);
921        tasklet_schedule(&re->tx_housekeeping_tasklet);
922    }
923
924    raeth_debugfs_update_int_stats(re, status);
925
926    return IRQ_HANDLED;
927}
928
929static int
930ramips_eth_hw_init(struct net_device *dev)
931{
932    struct raeth_priv *re = netdev_priv(dev);
933    int err;
934
935    err = request_irq(dev->irq, ramips_eth_irq, IRQF_DISABLED,
936              dev->name, dev);
937    if (err)
938        return err;
939
940    err = ramips_ring_alloc(re);
941    if (err)
942        goto err_free_irq;
943
944    ramips_ring_setup(re);
945    ramips_hw_set_macaddr(dev->dev_addr);
946
947    ramips_setup_dma(re);
948    ramips_fe_wr((ramips_fe_rr(RAMIPS_FE_GLO_CFG) &
949        ~(RAMIPS_US_CYC_CNT_MASK << RAMIPS_US_CYC_CNT_SHIFT)) |
950        ((re->plat->sys_freq / RAMIPS_US_CYC_CNT_DIVISOR) << RAMIPS_US_CYC_CNT_SHIFT),
951        RAMIPS_FE_GLO_CFG);
952
953    tasklet_init(&re->tx_housekeeping_tasklet, ramips_eth_tx_housekeeping,
954             (unsigned long)dev);
955    tasklet_init(&re->rx_tasklet, ramips_eth_rx_hw, (unsigned long)dev);
956
957
958    ramips_fe_twr(RAMIPS_DELAY_INIT, RAETH_REG_DLY_INT_CFG);
959    ramips_fe_twr(TX_DLY_INT | RX_DLY_INT, RAETH_REG_FE_INT_ENABLE);
960    if (soc_is_rt5350()) {
961        ramips_fe_wr(ramips_fe_rr(RT5350_SDM_CFG) &
962            ~(RT5350_SDM_ICS_EN | RT5350_SDM_TCS_EN | RT5350_SDM_UCS_EN | 0xffff),
963            RT5350_SDM_CFG);
964    } else {
965        ramips_fe_wr(ramips_fe_rr(RAMIPS_GDMA1_FWD_CFG) &
966            ~(RAMIPS_GDM1_ICS_EN | RAMIPS_GDM1_TCS_EN | RAMIPS_GDM1_UCS_EN | 0xffff),
967            RAMIPS_GDMA1_FWD_CFG);
968        ramips_fe_wr(ramips_fe_rr(RAMIPS_CDMA_CSG_CFG) &
969            ~(RAMIPS_ICS_GEN_EN | RAMIPS_TCS_GEN_EN | RAMIPS_UCS_GEN_EN),
970            RAMIPS_CDMA_CSG_CFG);
971        ramips_fe_wr(RAMIPS_PSE_FQFC_CFG_INIT, RAMIPS_PSE_FQ_CFG);
972    }
973    ramips_fe_wr(1, RAMIPS_FE_RST_GL);
974    ramips_fe_wr(0, RAMIPS_FE_RST_GL);
975
976    return 0;
977
978err_free_irq:
979    free_irq(dev->irq, dev);
980    return err;
981}
982
983static int
984ramips_eth_open(struct net_device *dev)
985{
986    struct raeth_priv *re = netdev_priv(dev);
987
988    ramips_fe_twr((ramips_fe_trr(RAETH_REG_PDMA_GLO_CFG) & 0xff) |
989        (RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN |
990        RAMIPS_TX_DMA_EN | RAMIPS_PDMA_SIZE_4DWORDS),
991        RAETH_REG_PDMA_GLO_CFG);
992    ramips_phy_start(re);
993    netif_start_queue(dev);
994    return 0;
995}
996
997static int
998ramips_eth_stop(struct net_device *dev)
999{
1000    struct raeth_priv *re = netdev_priv(dev);
1001
1002    ramips_fe_twr(ramips_fe_trr(RAETH_REG_PDMA_GLO_CFG) &
1003             ~(RAMIPS_TX_WB_DDONE | RAMIPS_RX_DMA_EN | RAMIPS_TX_DMA_EN),
1004             RAETH_REG_PDMA_GLO_CFG);
1005
1006    netif_stop_queue(dev);
1007    ramips_phy_stop(re);
1008    RADEBUG("ramips_eth: stopped\n");
1009    return 0;
1010}
1011
1012static int __init
1013ramips_eth_probe(struct net_device *dev)
1014{
1015    struct raeth_priv *re = netdev_priv(dev);
1016    int err;
1017
1018    BUG_ON(!re->plat->reset_fe);
1019    re->plat->reset_fe();
1020    net_srandom(jiffies);
1021    memcpy(dev->dev_addr, re->plat->mac, ETH_ALEN);
1022
1023    ether_setup(dev);
1024    dev->mtu = 1500;
1025    dev->watchdog_timeo = TX_TIMEOUT;
1026    spin_lock_init(&re->page_lock);
1027    spin_lock_init(&re->phy_lock);
1028
1029    err = ramips_mdio_init(re);
1030    if (err)
1031        return err;
1032
1033    err = ramips_phy_connect(re);
1034    if (err)
1035        goto err_mdio_cleanup;
1036
1037    err = raeth_debugfs_init(re);
1038    if (err)
1039        goto err_phy_disconnect;
1040
1041    err = ramips_eth_hw_init(dev);
1042    if (err)
1043        goto err_debugfs;
1044
1045    return 0;
1046
1047err_debugfs:
1048    raeth_debugfs_exit(re);
1049err_phy_disconnect:
1050    ramips_phy_disconnect(re);
1051err_mdio_cleanup:
1052    ramips_mdio_cleanup(re);
1053    return err;
1054}
1055
1056static void
1057ramips_eth_uninit(struct net_device *dev)
1058{
1059    struct raeth_priv *re = netdev_priv(dev);
1060
1061    raeth_debugfs_exit(re);
1062    ramips_phy_disconnect(re);
1063    ramips_mdio_cleanup(re);
1064    ramips_fe_twr(0, RAETH_REG_FE_INT_ENABLE);
1065    free_irq(dev->irq, dev);
1066    tasklet_kill(&re->tx_housekeeping_tasklet);
1067    tasklet_kill(&re->rx_tasklet);
1068    ramips_ring_cleanup(re);
1069    ramips_ring_free(re);
1070}
1071
1072static const struct net_device_ops ramips_eth_netdev_ops = {
1073    .ndo_init = ramips_eth_probe,
1074    .ndo_uninit = ramips_eth_uninit,
1075    .ndo_open = ramips_eth_open,
1076    .ndo_stop = ramips_eth_stop,
1077    .ndo_start_xmit = ramips_eth_hard_start_xmit,
1078    .ndo_tx_timeout = ramips_eth_timeout,
1079    .ndo_change_mtu = eth_change_mtu,
1080    .ndo_set_mac_address = eth_mac_addr,
1081    .ndo_validate_addr = eth_validate_addr,
1082};
1083
1084static int
1085ramips_eth_plat_probe(struct platform_device *plat)
1086{
1087    struct raeth_priv *re;
1088    struct ramips_eth_platform_data *data = plat->dev.platform_data;
1089    struct resource *res;
1090    int err;
1091
1092    if (!data) {
1093        dev_err(&plat->dev, "no platform data specified\n");
1094        return -EINVAL;
1095    }
1096
1097    res = platform_get_resource(plat, IORESOURCE_MEM, 0);
1098    if (!res) {
1099        dev_err(&plat->dev, "no memory resource found\n");
1100        return -ENXIO;
1101    }
1102
1103    ramips_fe_base = ioremap_nocache(res->start, res->end - res->start + 1);
1104    if (!ramips_fe_base)
1105        return -ENOMEM;
1106
1107    ramips_dev = alloc_etherdev(sizeof(struct raeth_priv));
1108    if (!ramips_dev) {
1109        dev_err(&plat->dev, "alloc_etherdev failed\n");
1110        err = -ENOMEM;
1111        goto err_unmap;
1112    }
1113
1114    strcpy(ramips_dev->name, "eth%d");
1115    ramips_dev->irq = platform_get_irq(plat, 0);
1116    if (ramips_dev->irq < 0) {
1117        dev_err(&plat->dev, "no IRQ resource found\n");
1118        err = -ENXIO;
1119        goto err_free_dev;
1120    }
1121    ramips_dev->addr_len = ETH_ALEN;
1122    ramips_dev->base_addr = (unsigned long)ramips_fe_base;
1123    ramips_dev->netdev_ops = &ramips_eth_netdev_ops;
1124
1125    re = netdev_priv(ramips_dev);
1126
1127    re->netdev = ramips_dev;
1128    re->parent = &plat->dev;
1129    re->speed = data->speed;
1130    re->duplex = data->duplex;
1131    re->rx_fc = data->rx_fc;
1132    re->tx_fc = data->tx_fc;
1133    re->plat = data;
1134
1135    err = register_netdev(ramips_dev);
1136    if (err) {
1137        dev_err(&plat->dev, "error bringing up device\n");
1138        goto err_free_dev;
1139    }
1140
1141    RADEBUG("ramips_eth: loaded\n");
1142    return 0;
1143
1144 err_free_dev:
1145    kfree(ramips_dev);
1146 err_unmap:
1147    iounmap(ramips_fe_base);
1148    return err;
1149}
1150
1151static int
1152ramips_eth_plat_remove(struct platform_device *plat)
1153{
1154    unregister_netdev(ramips_dev);
1155    free_netdev(ramips_dev);
1156    RADEBUG("ramips_eth: unloaded\n");
1157    return 0;
1158}
1159
1160static struct platform_driver ramips_eth_driver = {
1161    .probe = ramips_eth_plat_probe,
1162    .remove = ramips_eth_plat_remove,
1163    .driver = {
1164        .name = "ramips_eth",
1165        .owner = THIS_MODULE,
1166    },
1167};
1168
1169static int __init
1170ramips_eth_init(void)
1171{
1172    int ret;
1173
1174    ret = raeth_debugfs_root_init();
1175    if (ret)
1176        goto err_out;
1177
1178    ret = rt305x_esw_init();
1179    if (ret)
1180        goto err_debugfs_exit;
1181
1182    ret = platform_driver_register(&ramips_eth_driver);
1183    if (ret) {
1184        printk(KERN_ERR
1185               "ramips_eth: Error registering platfom driver!\n");
1186        goto esw_cleanup;
1187    }
1188
1189    return 0;
1190
1191esw_cleanup:
1192    rt305x_esw_exit();
1193err_debugfs_exit:
1194    raeth_debugfs_root_exit();
1195err_out:
1196    return ret;
1197}
1198
1199static void __exit
1200ramips_eth_cleanup(void)
1201{
1202    platform_driver_unregister(&ramips_eth_driver);
1203    rt305x_esw_exit();
1204    raeth_debugfs_root_exit();
1205}
1206
1207module_init(ramips_eth_init);
1208module_exit(ramips_eth_cleanup);
1209
1210MODULE_LICENSE("GPL");
1211MODULE_AUTHOR("John Crispin <blogic@openwrt.org>");
1212MODULE_DESCRIPTION("ethernet driver for ramips boards");
1213

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