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regulator: ad5398: Fix return value of ad5398_write_reg
[linux-2.6/btrfs-unstable.git] / drivers / net / ethernet / netx-eth.c
blob9fbc302642373adfcca03be6cff38d3d442c7b08
1 /*
2 * drivers/net/ethernet/netx-eth.c
3 *
4 * Copyright (c) 2005 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include <linux/init.h>
20 #include <linux/interrupt.h>
21 #include <linux/module.h>
22 #include <linux/kernel.h>
23 #include <linux/delay.h>
24
25 #include <linux/netdevice.h>
26 #include <linux/platform_device.h>
27 #include <linux/etherdevice.h>
28 #include <linux/skbuff.h>
29 #include <linux/mii.h>
30
31 #include <asm/io.h>
32 #include <mach/hardware.h>
33 #include <mach/netx-regs.h>
34 #include <mach/pfifo.h>
35 #include <mach/xc.h>
36 #include <linux/platform_data/eth-netx.h>
37
38 /* XC Fifo Offsets */
39 #define EMPTY_PTR_FIFO(xcno) (0 + ((xcno) << 3)) /* Index of the empty pointer FIFO */
40 #define IND_FIFO_PORT_HI(xcno) (1 + ((xcno) << 3)) /* Index of the FIFO where received */
41 /* Data packages are indicated by XC */
42 #define IND_FIFO_PORT_LO(xcno) (2 + ((xcno) << 3)) /* Index of the FIFO where received */
43 /* Data packages are indicated by XC */
44 #define REQ_FIFO_PORT_HI(xcno) (3 + ((xcno) << 3)) /* Index of the FIFO where Data packages */
45 /* have to be indicated by ARM which */
46 /* shall be sent */
47 #define REQ_FIFO_PORT_LO(xcno) (4 + ((xcno) << 3)) /* Index of the FIFO where Data packages */
48 /* have to be indicated by ARM which shall */
49 /* be sent */
50 #define CON_FIFO_PORT_HI(xcno) (5 + ((xcno) << 3)) /* Index of the FIFO where sent Data packages */
51 /* are confirmed */
52 #define CON_FIFO_PORT_LO(xcno) (6 + ((xcno) << 3)) /* Index of the FIFO where sent Data */
53 /* packages are confirmed */
54 #define PFIFO_MASK(xcno) (0x7f << (xcno*8))
55
56 #define FIFO_PTR_FRAMELEN_SHIFT 0
57 #define FIFO_PTR_FRAMELEN_MASK (0x7ff << 0)
58 #define FIFO_PTR_FRAMELEN(len) (((len) << 0) & FIFO_PTR_FRAMELEN_MASK)
59 #define FIFO_PTR_TIMETRIG (1<<11)
60 #define FIFO_PTR_MULTI_REQ
61 #define FIFO_PTR_ORIGIN (1<<14)
62 #define FIFO_PTR_VLAN (1<<15)
63 #define FIFO_PTR_FRAMENO_SHIFT 16
64 #define FIFO_PTR_FRAMENO_MASK (0x3f << 16)
65 #define FIFO_PTR_FRAMENO(no) (((no) << 16) & FIFO_PTR_FRAMENO_MASK)
66 #define FIFO_PTR_SEGMENT_SHIFT 22
67 #define FIFO_PTR_SEGMENT_MASK (0xf << 22)
68 #define FIFO_PTR_SEGMENT(seg) (((seg) & 0xf) << 22)
69 #define FIFO_PTR_ERROR_SHIFT 28
70 #define FIFO_PTR_ERROR_MASK (0xf << 28)
71
72 #define ISR_LINK_STATUS_CHANGE (1<<4)
73 #define ISR_IND_LO (1<<3)
74 #define ISR_CON_LO (1<<2)
75 #define ISR_IND_HI (1<<1)
76 #define ISR_CON_HI (1<<0)
77
78 #define ETH_MAC_LOCAL_CONFIG 0x1560
79 #define ETH_MAC_4321 0x1564
80 #define ETH_MAC_65 0x1568
81
82 #define MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT 16
83 #define MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK (0xf<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT)
84 #define MAC_TRAFFIC_CLASS_ARRANGEMENT(x) (((x)<<MAC_TRAFFIC_CLASS_ARRANGEMENT_SHIFT) & MAC_TRAFFIC_CLASS_ARRANGEMENT_MASK)
85 #define LOCAL_CONFIG_LINK_STATUS_IRQ_EN (1<<24)
86 #define LOCAL_CONFIG_CON_LO_IRQ_EN (1<<23)
87 #define LOCAL_CONFIG_CON_HI_IRQ_EN (1<<22)
88 #define LOCAL_CONFIG_IND_LO_IRQ_EN (1<<21)
89 #define LOCAL_CONFIG_IND_HI_IRQ_EN (1<<20)
90
91 #define CARDNAME "netx-eth"
92
93 /* LSB must be zero */
94 #define INTERNAL_PHY_ADR 0x1c
95
96 struct netx_eth_priv {
97 void __iomem *sram_base, *xpec_base, *xmac_base;
98 int id;
99 struct mii_if_info mii;
100 u32 msg_enable;
101 struct xc *xc;
102 spinlock_t lock;
103 };
104
105 static void netx_eth_set_multicast_list(struct net_device *ndev)
106 {
107 /* implement me */
108 }
109
110 static int
111 netx_eth_hard_start_xmit(struct sk_buff *skb, struct net_device *ndev)
112 {
113 struct netx_eth_priv *priv = netdev_priv(ndev);
114 unsigned char *buf = skb->data;
115 unsigned int len = skb->len;
116
117 spin_lock_irq(&priv->lock);
118 memcpy_toio(priv->sram_base + 1560, (void *)buf, len);
119 if (len < 60) {
120 memset_io(priv->sram_base + 1560 + len, 0, 60 - len);
121 len = 60;
122 }
123
124 pfifo_push(REQ_FIFO_PORT_LO(priv->id),
125 FIFO_PTR_SEGMENT(priv->id) |
126 FIFO_PTR_FRAMENO(1) |
127 FIFO_PTR_FRAMELEN(len));
128
129 ndev->stats.tx_packets++;
130 ndev->stats.tx_bytes += skb->len;
131
132 netif_stop_queue(ndev);
133 spin_unlock_irq(&priv->lock);
134 dev_kfree_skb(skb);
135
136 return NETDEV_TX_OK;
137 }
138
139 static void netx_eth_receive(struct net_device *ndev)
140 {
141 struct netx_eth_priv *priv = netdev_priv(ndev);
142 unsigned int val, frameno, seg, len;
143 unsigned char *data;
144 struct sk_buff *skb;
145
146 val = pfifo_pop(IND_FIFO_PORT_LO(priv->id));
147
148 frameno = (val & FIFO_PTR_FRAMENO_MASK) >> FIFO_PTR_FRAMENO_SHIFT;
149 seg = (val & FIFO_PTR_SEGMENT_MASK) >> FIFO_PTR_SEGMENT_SHIFT;
150 len = (val & FIFO_PTR_FRAMELEN_MASK) >> FIFO_PTR_FRAMELEN_SHIFT;
151
152 skb = netdev_alloc_skb(ndev, len);
153 if (unlikely(skb == NULL)) {
154 ndev->stats.rx_dropped++;
155 return;
156 }
157
158 data = skb_put(skb, len);
159
160 memcpy_fromio(data, priv->sram_base + frameno * 1560, len);
161
162 pfifo_push(EMPTY_PTR_FIFO(priv->id),
163 FIFO_PTR_SEGMENT(seg) | FIFO_PTR_FRAMENO(frameno));
164
165 skb->protocol = eth_type_trans(skb, ndev);
166 netif_rx(skb);
167 ndev->stats.rx_packets++;
168 ndev->stats.rx_bytes += len;
169 }
170
171 static irqreturn_t
172 netx_eth_interrupt(int irq, void *dev_id)
173 {
174 struct net_device *ndev = dev_id;
175 struct netx_eth_priv *priv = netdev_priv(ndev);
176 int status;
177 unsigned long flags;
178
179 spin_lock_irqsave(&priv->lock, flags);
180
181 status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
182 while (status) {
183 int fill_level;
184 writel(status, NETX_PFIFO_XPEC_ISR(priv->id));
185
186 if ((status & ISR_CON_HI) || (status & ISR_IND_HI))
187 printk("%s: unexpected status: 0x%08x\n",
188 __func__, status);
189
190 fill_level =
191 readl(NETX_PFIFO_FILL_LEVEL(IND_FIFO_PORT_LO(priv->id)));
192 while (fill_level--)
193 netx_eth_receive(ndev);
194
195 if (status & ISR_CON_LO)
196 netif_wake_queue(ndev);
197
198 if (status & ISR_LINK_STATUS_CHANGE)
199 mii_check_media(&priv->mii, netif_msg_link(priv), 1);
200
201 status = readl(NETX_PFIFO_XPEC_ISR(priv->id));
202 }
203 spin_unlock_irqrestore(&priv->lock, flags);
204 return IRQ_HANDLED;
205 }
206
207 static int netx_eth_open(struct net_device *ndev)
208 {
209 struct netx_eth_priv *priv = netdev_priv(ndev);
210
211 if (request_irq
212 (ndev->irq, netx_eth_interrupt, IRQF_SHARED, ndev->name, ndev))
213 return -EAGAIN;
214
215 writel(ndev->dev_addr[0] |
216 ndev->dev_addr[1]<<8 |
217 ndev->dev_addr[2]<<16 |
218 ndev->dev_addr[3]<<24,
219 priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
220 writel(ndev->dev_addr[4] |
221 ndev->dev_addr[5]<<8,
222 priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
223
224 writel(LOCAL_CONFIG_LINK_STATUS_IRQ_EN |
225 LOCAL_CONFIG_CON_LO_IRQ_EN |
226 LOCAL_CONFIG_CON_HI_IRQ_EN |
227 LOCAL_CONFIG_IND_LO_IRQ_EN |
228 LOCAL_CONFIG_IND_HI_IRQ_EN,
229 priv->xpec_base + NETX_XPEC_RAM_START_OFS +
230 ETH_MAC_LOCAL_CONFIG);
231
232 mii_check_media(&priv->mii, netif_msg_link(priv), 1);
233 netif_start_queue(ndev);
234
235 return 0;
236 }
237
238 static int netx_eth_close(struct net_device *ndev)
239 {
240 struct netx_eth_priv *priv = netdev_priv(ndev);
241
242 netif_stop_queue(ndev);
243
244 writel(0,
245 priv->xpec_base + NETX_XPEC_RAM_START_OFS + ETH_MAC_LOCAL_CONFIG);
246
247 free_irq(ndev->irq, ndev);
248
249 return 0;
250 }
251
252 static void netx_eth_timeout(struct net_device *ndev)
253 {
254 struct netx_eth_priv *priv = netdev_priv(ndev);
255 int i;
256
257 printk(KERN_ERR "%s: transmit timed out, resetting\n", ndev->name);
258
259 spin_lock_irq(&priv->lock);
260
261 xc_reset(priv->xc);
262 xc_start(priv->xc);
263
264 for (i=2; i<=18; i++)
265 pfifo_push(EMPTY_PTR_FIFO(priv->id),
266 FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
267
268 spin_unlock_irq(&priv->lock);
269
270 netif_wake_queue(ndev);
271 }
272
273 static int
274 netx_eth_phy_read(struct net_device *ndev, int phy_id, int reg)
275 {
276 unsigned int val;
277
278 val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
279 MIIMU_REGADDR(reg) | MIIMU_PHY_NRES;
280
281 writel(val, NETX_MIIMU);
282 while (readl(NETX_MIIMU) & MIIMU_SNRDY);
283
284 return readl(NETX_MIIMU) >> 16;
285
286 }
287
288 static void
289 netx_eth_phy_write(struct net_device *ndev, int phy_id, int reg, int value)
290 {
291 unsigned int val;
292
293 val = MIIMU_SNRDY | MIIMU_PREAMBLE | MIIMU_PHYADDR(phy_id) |
294 MIIMU_REGADDR(reg) | MIIMU_PHY_NRES | MIIMU_OPMODE_WRITE |
295 MIIMU_DATA(value);
296
297 writel(val, NETX_MIIMU);
298 while (readl(NETX_MIIMU) & MIIMU_SNRDY);
299 }
300
301 static const struct net_device_ops netx_eth_netdev_ops = {
302 .ndo_open = netx_eth_open,
303 .ndo_stop = netx_eth_close,
304 .ndo_start_xmit = netx_eth_hard_start_xmit,
305 .ndo_tx_timeout = netx_eth_timeout,
306 .ndo_set_rx_mode = netx_eth_set_multicast_list,
307 .ndo_change_mtu = eth_change_mtu,
308 .ndo_validate_addr = eth_validate_addr,
309 .ndo_set_mac_address = eth_mac_addr,
310 };
311
312 static int netx_eth_enable(struct net_device *ndev)
313 {
314 struct netx_eth_priv *priv = netdev_priv(ndev);
315 unsigned int mac4321, mac65;
316 int running, i;
317
318 ndev->netdev_ops = &netx_eth_netdev_ops;
319 ndev->watchdog_timeo = msecs_to_jiffies(5000);
320
321 priv->msg_enable = NETIF_MSG_LINK;
322 priv->mii.phy_id_mask = 0x1f;
323 priv->mii.reg_num_mask = 0x1f;
324 priv->mii.force_media = 0;
325 priv->mii.full_duplex = 0;
326 priv->mii.dev = ndev;
327 priv->mii.mdio_read = netx_eth_phy_read;
328 priv->mii.mdio_write = netx_eth_phy_write;
329 priv->mii.phy_id = INTERNAL_PHY_ADR + priv->id;
330
331 running = xc_running(priv->xc);
332 xc_stop(priv->xc);
333
334 /* if the xc engine is already running, assume the bootloader has
335 * loaded the firmware for us
336 */
337 if (running) {
338 /* get Node Address from hardware */
339 mac4321 = readl(priv->xpec_base +
340 NETX_XPEC_RAM_START_OFS + ETH_MAC_4321);
341 mac65 = readl(priv->xpec_base +
342 NETX_XPEC_RAM_START_OFS + ETH_MAC_65);
343
344 ndev->dev_addr[0] = mac4321 & 0xff;
345 ndev->dev_addr[1] = (mac4321 >> 8) & 0xff;
346 ndev->dev_addr[2] = (mac4321 >> 16) & 0xff;
347 ndev->dev_addr[3] = (mac4321 >> 24) & 0xff;
348 ndev->dev_addr[4] = mac65 & 0xff;
349 ndev->dev_addr[5] = (mac65 >> 8) & 0xff;
350 } else {
351 if (xc_request_firmware(priv->xc)) {
352 printk(CARDNAME ": requesting firmware failed\n");
353 return -ENODEV;
354 }
355 }
356
357 xc_reset(priv->xc);
358 xc_start(priv->xc);
359
360 if (!is_valid_ether_addr(ndev->dev_addr))
361 printk("%s: Invalid ethernet MAC address. Please "
362 "set using ifconfig\n", ndev->name);
363
364 for (i=2; i<=18; i++)
365 pfifo_push(EMPTY_PTR_FIFO(priv->id),
366 FIFO_PTR_FRAMENO(i) | FIFO_PTR_SEGMENT(priv->id));
367
368 return register_netdev(ndev);
369
370 }
371
372 static int netx_eth_drv_probe(struct platform_device *pdev)
373 {
374 struct netx_eth_priv *priv;
375 struct net_device *ndev;
376 struct netxeth_platform_data *pdata;
377 int ret;
378
379 ndev = alloc_etherdev(sizeof (struct netx_eth_priv));
380 if (!ndev) {
381 ret = -ENOMEM;
382 goto exit;
383 }
384 SET_NETDEV_DEV(ndev, &pdev->dev);
385
386 platform_set_drvdata(pdev, ndev);
387
388 priv = netdev_priv(ndev);
389
390 pdata = dev_get_platdata(&pdev->dev);
391 priv->xc = request_xc(pdata->xcno, &pdev->dev);
392 if (!priv->xc) {
393 dev_err(&pdev->dev, "unable to request xc engine\n");
394 ret = -ENODEV;
395 goto exit_free_netdev;
396 }
397
398 ndev->irq = priv->xc->irq;
399 priv->id = pdev->id;
400 priv->xpec_base = priv->xc->xpec_base;
401 priv->xmac_base = priv->xc->xmac_base;
402 priv->sram_base = priv->xc->sram_base;
403
404 spin_lock_init(&priv->lock);
405
406 ret = pfifo_request(PFIFO_MASK(priv->id));
407 if (ret) {
408 printk("unable to request PFIFO\n");
409 goto exit_free_xc;
410 }
411
412 ret = netx_eth_enable(ndev);
413 if (ret)
414 goto exit_free_pfifo;
415
416 return 0;
417 exit_free_pfifo:
418 pfifo_free(PFIFO_MASK(priv->id));
419 exit_free_xc:
420 free_xc(priv->xc);
421 exit_free_netdev:
422 free_netdev(ndev);
423 exit:
424 return ret;
425 }
426
427 static int netx_eth_drv_remove(struct platform_device *pdev)
428 {
429 struct net_device *ndev = platform_get_drvdata(pdev);
430 struct netx_eth_priv *priv = netdev_priv(ndev);
431
432 unregister_netdev(ndev);
433 xc_stop(priv->xc);
434 free_xc(priv->xc);
435 free_netdev(ndev);
436 pfifo_free(PFIFO_MASK(priv->id));
437
438 return 0;
439 }
440
441 static int netx_eth_drv_suspend(struct platform_device *pdev, pm_message_t state)
442 {
443 dev_err(&pdev->dev, "suspend not implemented\n");
444 return 0;
445 }
446
447 static int netx_eth_drv_resume(struct platform_device *pdev)
448 {
449 dev_err(&pdev->dev, "resume not implemented\n");
450 return 0;
451 }
452
453 static struct platform_driver netx_eth_driver = {
454 .probe = netx_eth_drv_probe,
455 .remove = netx_eth_drv_remove,
456 .suspend = netx_eth_drv_suspend,
457 .resume = netx_eth_drv_resume,
458 .driver = {
459 .name = CARDNAME,
460 },
461 };
462
463 static int __init netx_eth_init(void)
464 {
465 unsigned int phy_control, val;
466
467 printk("NetX Ethernet driver\n");
468
469 phy_control = PHY_CONTROL_PHY_ADDRESS(INTERNAL_PHY_ADR>>1) |
470 PHY_CONTROL_PHY1_MODE(PHY_MODE_ALL) |
471 PHY_CONTROL_PHY1_AUTOMDIX |
472 PHY_CONTROL_PHY1_EN |
473 PHY_CONTROL_PHY0_MODE(PHY_MODE_ALL) |
474 PHY_CONTROL_PHY0_AUTOMDIX |
475 PHY_CONTROL_PHY0_EN |
476 PHY_CONTROL_CLK_XLATIN;
477
478 val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
479 writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
480
481 writel(phy_control | PHY_CONTROL_RESET, NETX_SYSTEM_PHY_CONTROL);
482 udelay(100);
483
484 val = readl(NETX_SYSTEM_IOC_ACCESS_KEY);
485 writel(val, NETX_SYSTEM_IOC_ACCESS_KEY);
486
487 writel(phy_control, NETX_SYSTEM_PHY_CONTROL);
488
489 return platform_driver_register(&netx_eth_driver);
490 }
491
492 static void __exit netx_eth_cleanup(void)
493 {
494 platform_driver_unregister(&netx_eth_driver);
495 }
496
497 module_init(netx_eth_init);
498 module_exit(netx_eth_cleanup);
499
500 MODULE_AUTHOR("Sascha Hauer, Pengutronix");
501 MODULE_LICENSE("GPL");
502 MODULE_ALIAS("platform:" CARDNAME);
503 MODULE_FIRMWARE("xc0.bin");
504 MODULE_FIRMWARE("xc1.bin");
505 MODULE_FIRMWARE("xc2.bin");
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