xref: /openbmc/linux/drivers/net/ethernet/rdc/r6040.c (revision 7e43039a)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * RDC R6040 Fast Ethernet MAC support
4  *
5  * Copyright (C) 2004 Sten Wang <sten.wang@rdc.com.tw>
6  * Copyright (C) 2007
7  *	Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>
8  * Copyright (C) 2007-2012 Florian Fainelli <f.fainelli@gmail.com>
9 */
10 
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/moduleparam.h>
14 #include <linux/string.h>
15 #include <linux/timer.h>
16 #include <linux/errno.h>
17 #include <linux/ioport.h>
18 #include <linux/interrupt.h>
19 #include <linux/pci.h>
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/skbuff.h>
23 #include <linux/delay.h>
24 #include <linux/mii.h>
25 #include <linux/ethtool.h>
26 #include <linux/crc32.h>
27 #include <linux/spinlock.h>
28 #include <linux/bitops.h>
29 #include <linux/io.h>
30 #include <linux/irq.h>
31 #include <linux/uaccess.h>
32 #include <linux/phy.h>
33 
34 #include <asm/processor.h>
35 
36 #define DRV_NAME	"r6040"
37 #define DRV_VERSION	"0.29"
38 #define DRV_RELDATE	"04Jul2016"
39 
40 /* Time in jiffies before concluding the transmitter is hung. */
41 #define TX_TIMEOUT	(6000 * HZ / 1000)
42 
43 /* RDC MAC I/O Size */
44 #define R6040_IO_SIZE	256
45 
46 /* MAX RDC MAC */
47 #define MAX_MAC		2
48 
49 /* MAC registers */
50 #define MCR0		0x00	/* Control register 0 */
51 #define  MCR0_RCVEN	0x0002	/* Receive enable */
52 #define  MCR0_PROMISC	0x0020	/* Promiscuous mode */
53 #define  MCR0_HASH_EN	0x0100	/* Enable multicast hash table function */
54 #define  MCR0_XMTEN	0x1000	/* Transmission enable */
55 #define  MCR0_FD	0x8000	/* Full/Half duplex */
56 #define MCR1		0x04	/* Control register 1 */
57 #define  MAC_RST	0x0001	/* Reset the MAC */
58 #define MBCR		0x08	/* Bus control */
59 #define MT_ICR		0x0C	/* TX interrupt control */
60 #define MR_ICR		0x10	/* RX interrupt control */
61 #define MTPR		0x14	/* TX poll command register */
62 #define  TM2TX		0x0001	/* Trigger MAC to transmit */
63 #define MR_BSR		0x18	/* RX buffer size */
64 #define MR_DCR		0x1A	/* RX descriptor control */
65 #define MLSR		0x1C	/* Last status */
66 #define  TX_FIFO_UNDR	0x0200	/* TX FIFO under-run */
67 #define	 TX_EXCEEDC	0x2000	/* Transmit exceed collision */
68 #define  TX_LATEC	0x4000	/* Transmit late collision */
69 #define MMDIO		0x20	/* MDIO control register */
70 #define  MDIO_WRITE	0x4000	/* MDIO write */
71 #define  MDIO_READ	0x2000	/* MDIO read */
72 #define MMRD		0x24	/* MDIO read data register */
73 #define MMWD		0x28	/* MDIO write data register */
74 #define MTD_SA0		0x2C	/* TX descriptor start address 0 */
75 #define MTD_SA1		0x30	/* TX descriptor start address 1 */
76 #define MRD_SA0		0x34	/* RX descriptor start address 0 */
77 #define MRD_SA1		0x38	/* RX descriptor start address 1 */
78 #define MISR		0x3C	/* Status register */
79 #define MIER		0x40	/* INT enable register */
80 #define  MSK_INT	0x0000	/* Mask off interrupts */
81 #define  RX_FINISH	0x0001  /* RX finished */
82 #define  RX_NO_DESC	0x0002  /* No RX descriptor available */
83 #define  RX_FIFO_FULL	0x0004  /* RX FIFO full */
84 #define  RX_EARLY	0x0008  /* RX early */
85 #define  TX_FINISH	0x0010  /* TX finished */
86 #define  TX_EARLY	0x0080  /* TX early */
87 #define  EVENT_OVRFL	0x0100  /* Event counter overflow */
88 #define  LINK_CHANGED	0x0200  /* PHY link changed */
89 #define ME_CISR		0x44	/* Event counter INT status */
90 #define ME_CIER		0x48	/* Event counter INT enable  */
91 #define MR_CNT		0x50	/* Successfully received packet counter */
92 #define ME_CNT0		0x52	/* Event counter 0 */
93 #define ME_CNT1		0x54	/* Event counter 1 */
94 #define ME_CNT2		0x56	/* Event counter 2 */
95 #define ME_CNT3		0x58	/* Event counter 3 */
96 #define MT_CNT		0x5A	/* Successfully transmit packet counter */
97 #define ME_CNT4		0x5C	/* Event counter 4 */
98 #define MP_CNT		0x5E	/* Pause frame counter register */
99 #define MAR0		0x60	/* Hash table 0 */
100 #define MAR1		0x62	/* Hash table 1 */
101 #define MAR2		0x64	/* Hash table 2 */
102 #define MAR3		0x66	/* Hash table 3 */
103 #define MID_0L		0x68	/* Multicast address MID0 Low */
104 #define MID_0M		0x6A	/* Multicast address MID0 Medium */
105 #define MID_0H		0x6C	/* Multicast address MID0 High */
106 #define MID_1L		0x70	/* MID1 Low */
107 #define MID_1M		0x72	/* MID1 Medium */
108 #define MID_1H		0x74	/* MID1 High */
109 #define MID_2L		0x78	/* MID2 Low */
110 #define MID_2M		0x7A	/* MID2 Medium */
111 #define MID_2H		0x7C	/* MID2 High */
112 #define MID_3L		0x80	/* MID3 Low */
113 #define MID_3M		0x82	/* MID3 Medium */
114 #define MID_3H		0x84	/* MID3 High */
115 #define PHY_CC		0x88	/* PHY status change configuration register */
116 #define  SCEN		0x8000	/* PHY status change enable */
117 #define  PHYAD_SHIFT	8	/* PHY address shift */
118 #define  TMRDIV_SHIFT	0	/* Timer divider shift */
119 #define PHY_ST		0x8A	/* PHY status register */
120 #define MAC_SM		0xAC	/* MAC status machine */
121 #define  MAC_SM_RST	0x0002	/* MAC status machine reset */
122 #define MD_CSC		0xb6	/* MDC speed control register */
123 #define  MD_CSC_DEFAULT	0x0030
124 #define MAC_ID		0xBE	/* Identifier register */
125 
126 #define TX_DCNT		0x80	/* TX descriptor count */
127 #define RX_DCNT		0x80	/* RX descriptor count */
128 #define MAX_BUF_SIZE	0x600
129 #define RX_DESC_SIZE	(RX_DCNT * sizeof(struct r6040_descriptor))
130 #define TX_DESC_SIZE	(TX_DCNT * sizeof(struct r6040_descriptor))
131 #define MBCR_DEFAULT	0x012A	/* MAC Bus Control Register */
132 #define MCAST_MAX	3	/* Max number multicast addresses to filter */
133 
134 #define MAC_DEF_TIMEOUT	2048	/* Default MAC read/write operation timeout */
135 
136 /* Descriptor status */
137 #define DSC_OWNER_MAC	0x8000	/* MAC is the owner of this descriptor */
138 #define DSC_RX_OK	0x4000	/* RX was successful */
139 #define DSC_RX_ERR	0x0800	/* RX PHY error */
140 #define DSC_RX_ERR_DRI	0x0400	/* RX dribble packet */
141 #define DSC_RX_ERR_BUF	0x0200	/* RX length exceeds buffer size */
142 #define DSC_RX_ERR_LONG	0x0100	/* RX length > maximum packet length */
143 #define DSC_RX_ERR_RUNT	0x0080	/* RX packet length < 64 byte */
144 #define DSC_RX_ERR_CRC	0x0040	/* RX CRC error */
145 #define DSC_RX_BCAST	0x0020	/* RX broadcast (no error) */
146 #define DSC_RX_MCAST	0x0010	/* RX multicast (no error) */
147 #define DSC_RX_MCH_HIT	0x0008	/* RX multicast hit in hash table (no error) */
148 #define DSC_RX_MIDH_HIT	0x0004	/* RX MID table hit (no error) */
149 #define DSC_RX_IDX_MID_MASK 3	/* RX mask for the index of matched MIDx */
150 
151 MODULE_AUTHOR("Sten Wang <sten.wang@rdc.com.tw>,"
152 	"Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>,"
153 	"Florian Fainelli <f.fainelli@gmail.com>");
154 MODULE_LICENSE("GPL");
155 MODULE_DESCRIPTION("RDC R6040 NAPI PCI FastEthernet driver");
156 MODULE_VERSION(DRV_VERSION " " DRV_RELDATE);
157 
158 /* RX and TX interrupts that we handle */
159 #define RX_INTS			(RX_FIFO_FULL | RX_NO_DESC | RX_FINISH)
160 #define TX_INTS			(TX_FINISH)
161 #define INT_MASK		(RX_INTS | TX_INTS)
162 
163 struct r6040_descriptor {
164 	u16	status, len;		/* 0-3 */
165 	__le32	buf;			/* 4-7 */
166 	__le32	ndesc;			/* 8-B */
167 	u32	rev1;			/* C-F */
168 	char	*vbufp;			/* 10-13 */
169 	struct r6040_descriptor *vndescp;	/* 14-17 */
170 	struct sk_buff *skb_ptr;	/* 18-1B */
171 	u32	rev2;			/* 1C-1F */
172 } __aligned(32);
173 
174 struct r6040_private {
175 	spinlock_t lock;		/* driver lock */
176 	struct pci_dev *pdev;
177 	struct r6040_descriptor *rx_insert_ptr;
178 	struct r6040_descriptor *rx_remove_ptr;
179 	struct r6040_descriptor *tx_insert_ptr;
180 	struct r6040_descriptor *tx_remove_ptr;
181 	struct r6040_descriptor *rx_ring;
182 	struct r6040_descriptor *tx_ring;
183 	dma_addr_t rx_ring_dma;
184 	dma_addr_t tx_ring_dma;
185 	u16	tx_free_desc;
186 	u16	mcr0;
187 	struct net_device *dev;
188 	struct mii_bus *mii_bus;
189 	struct napi_struct napi;
190 	void __iomem *base;
191 	int old_link;
192 	int old_duplex;
193 };
194 
195 static char version[] = DRV_NAME
196 	": RDC R6040 NAPI net driver,"
197 	"version "DRV_VERSION " (" DRV_RELDATE ")";
198 
199 /* Read a word data from PHY Chip */
r6040_phy_read(void __iomem * ioaddr,int phy_addr,int reg)200 static int r6040_phy_read(void __iomem *ioaddr, int phy_addr, int reg)
201 {
202 	int limit = MAC_DEF_TIMEOUT;
203 	u16 cmd;
204 
205 	iowrite16(MDIO_READ | reg | (phy_addr << 8), ioaddr + MMDIO);
206 	/* Wait for the read bit to be cleared */
207 	while (limit--) {
208 		cmd = ioread16(ioaddr + MMDIO);
209 		if (!(cmd & MDIO_READ))
210 			break;
211 		udelay(1);
212 	}
213 
214 	if (limit < 0)
215 		return -ETIMEDOUT;
216 
217 	return ioread16(ioaddr + MMRD);
218 }
219 
220 /* Write a word data from PHY Chip */
r6040_phy_write(void __iomem * ioaddr,int phy_addr,int reg,u16 val)221 static int r6040_phy_write(void __iomem *ioaddr,
222 					int phy_addr, int reg, u16 val)
223 {
224 	int limit = MAC_DEF_TIMEOUT;
225 	u16 cmd;
226 
227 	iowrite16(val, ioaddr + MMWD);
228 	/* Write the command to the MDIO bus */
229 	iowrite16(MDIO_WRITE | reg | (phy_addr << 8), ioaddr + MMDIO);
230 	/* Wait for the write bit to be cleared */
231 	while (limit--) {
232 		cmd = ioread16(ioaddr + MMDIO);
233 		if (!(cmd & MDIO_WRITE))
234 			break;
235 		udelay(1);
236 	}
237 
238 	return (limit < 0) ? -ETIMEDOUT : 0;
239 }
240 
r6040_mdiobus_read(struct mii_bus * bus,int phy_addr,int reg)241 static int r6040_mdiobus_read(struct mii_bus *bus, int phy_addr, int reg)
242 {
243 	struct net_device *dev = bus->priv;
244 	struct r6040_private *lp = netdev_priv(dev);
245 	void __iomem *ioaddr = lp->base;
246 
247 	return r6040_phy_read(ioaddr, phy_addr, reg);
248 }
249 
r6040_mdiobus_write(struct mii_bus * bus,int phy_addr,int reg,u16 value)250 static int r6040_mdiobus_write(struct mii_bus *bus, int phy_addr,
251 						int reg, u16 value)
252 {
253 	struct net_device *dev = bus->priv;
254 	struct r6040_private *lp = netdev_priv(dev);
255 	void __iomem *ioaddr = lp->base;
256 
257 	return r6040_phy_write(ioaddr, phy_addr, reg, value);
258 }
259 
r6040_free_txbufs(struct net_device * dev)260 static void r6040_free_txbufs(struct net_device *dev)
261 {
262 	struct r6040_private *lp = netdev_priv(dev);
263 	int i;
264 
265 	for (i = 0; i < TX_DCNT; i++) {
266 		if (lp->tx_insert_ptr->skb_ptr) {
267 			dma_unmap_single(&lp->pdev->dev,
268 					 le32_to_cpu(lp->tx_insert_ptr->buf),
269 					 MAX_BUF_SIZE, DMA_TO_DEVICE);
270 			dev_kfree_skb(lp->tx_insert_ptr->skb_ptr);
271 			lp->tx_insert_ptr->skb_ptr = NULL;
272 		}
273 		lp->tx_insert_ptr = lp->tx_insert_ptr->vndescp;
274 	}
275 }
276 
r6040_free_rxbufs(struct net_device * dev)277 static void r6040_free_rxbufs(struct net_device *dev)
278 {
279 	struct r6040_private *lp = netdev_priv(dev);
280 	int i;
281 
282 	for (i = 0; i < RX_DCNT; i++) {
283 		if (lp->rx_insert_ptr->skb_ptr) {
284 			dma_unmap_single(&lp->pdev->dev,
285 					 le32_to_cpu(lp->rx_insert_ptr->buf),
286 					 MAX_BUF_SIZE, DMA_FROM_DEVICE);
287 			dev_kfree_skb(lp->rx_insert_ptr->skb_ptr);
288 			lp->rx_insert_ptr->skb_ptr = NULL;
289 		}
290 		lp->rx_insert_ptr = lp->rx_insert_ptr->vndescp;
291 	}
292 }
293 
r6040_init_ring_desc(struct r6040_descriptor * desc_ring,dma_addr_t desc_dma,int size)294 static void r6040_init_ring_desc(struct r6040_descriptor *desc_ring,
295 				 dma_addr_t desc_dma, int size)
296 {
297 	struct r6040_descriptor *desc = desc_ring;
298 	dma_addr_t mapping = desc_dma;
299 
300 	while (size-- > 0) {
301 		mapping += sizeof(*desc);
302 		desc->ndesc = cpu_to_le32(mapping);
303 		desc->vndescp = desc + 1;
304 		desc++;
305 	}
306 	desc--;
307 	desc->ndesc = cpu_to_le32(desc_dma);
308 	desc->vndescp = desc_ring;
309 }
310 
r6040_init_txbufs(struct net_device * dev)311 static void r6040_init_txbufs(struct net_device *dev)
312 {
313 	struct r6040_private *lp = netdev_priv(dev);
314 
315 	lp->tx_free_desc = TX_DCNT;
316 
317 	lp->tx_remove_ptr = lp->tx_insert_ptr = lp->tx_ring;
318 	r6040_init_ring_desc(lp->tx_ring, lp->tx_ring_dma, TX_DCNT);
319 }
320 
r6040_alloc_rxbufs(struct net_device * dev)321 static int r6040_alloc_rxbufs(struct net_device *dev)
322 {
323 	struct r6040_private *lp = netdev_priv(dev);
324 	struct r6040_descriptor *desc;
325 	struct sk_buff *skb;
326 	int rc;
327 
328 	lp->rx_remove_ptr = lp->rx_insert_ptr = lp->rx_ring;
329 	r6040_init_ring_desc(lp->rx_ring, lp->rx_ring_dma, RX_DCNT);
330 
331 	/* Allocate skbs for the rx descriptors */
332 	desc = lp->rx_ring;
333 	do {
334 		skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
335 		if (!skb) {
336 			rc = -ENOMEM;
337 			goto err_exit;
338 		}
339 		desc->skb_ptr = skb;
340 		desc->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev,
341 						       desc->skb_ptr->data,
342 						       MAX_BUF_SIZE,
343 						       DMA_FROM_DEVICE));
344 		desc->status = DSC_OWNER_MAC;
345 		desc = desc->vndescp;
346 	} while (desc != lp->rx_ring);
347 
348 	return 0;
349 
350 err_exit:
351 	/* Deallocate all previously allocated skbs */
352 	r6040_free_rxbufs(dev);
353 	return rc;
354 }
355 
r6040_reset_mac(struct r6040_private * lp)356 static void r6040_reset_mac(struct r6040_private *lp)
357 {
358 	void __iomem *ioaddr = lp->base;
359 	int limit = MAC_DEF_TIMEOUT;
360 	u16 cmd, md_csc;
361 
362 	md_csc = ioread16(ioaddr + MD_CSC);
363 	iowrite16(MAC_RST, ioaddr + MCR1);
364 	while (limit--) {
365 		cmd = ioread16(ioaddr + MCR1);
366 		if (cmd & MAC_RST)
367 			break;
368 	}
369 
370 	/* Reset internal state machine */
371 	iowrite16(MAC_SM_RST, ioaddr + MAC_SM);
372 	iowrite16(0, ioaddr + MAC_SM);
373 	mdelay(5);
374 
375 	/* Restore MDIO clock frequency */
376 	if (md_csc != MD_CSC_DEFAULT)
377 		iowrite16(md_csc, ioaddr + MD_CSC);
378 }
379 
r6040_init_mac_regs(struct net_device * dev)380 static void r6040_init_mac_regs(struct net_device *dev)
381 {
382 	struct r6040_private *lp = netdev_priv(dev);
383 	void __iomem *ioaddr = lp->base;
384 
385 	/* Mask Off Interrupt */
386 	iowrite16(MSK_INT, ioaddr + MIER);
387 
388 	/* Reset RDC MAC */
389 	r6040_reset_mac(lp);
390 
391 	/* MAC Bus Control Register */
392 	iowrite16(MBCR_DEFAULT, ioaddr + MBCR);
393 
394 	/* Buffer Size Register */
395 	iowrite16(MAX_BUF_SIZE, ioaddr + MR_BSR);
396 
397 	/* Write TX ring start address */
398 	iowrite16(lp->tx_ring_dma, ioaddr + MTD_SA0);
399 	iowrite16(lp->tx_ring_dma >> 16, ioaddr + MTD_SA1);
400 
401 	/* Write RX ring start address */
402 	iowrite16(lp->rx_ring_dma, ioaddr + MRD_SA0);
403 	iowrite16(lp->rx_ring_dma >> 16, ioaddr + MRD_SA1);
404 
405 	/* Set interrupt waiting time and packet numbers */
406 	iowrite16(0, ioaddr + MT_ICR);
407 	iowrite16(0, ioaddr + MR_ICR);
408 
409 	/* Enable interrupts */
410 	iowrite16(INT_MASK, ioaddr + MIER);
411 
412 	/* Enable TX and RX */
413 	iowrite16(lp->mcr0 | MCR0_RCVEN, ioaddr);
414 
415 	/* Let TX poll the descriptors
416 	 * we may got called by r6040_tx_timeout which has left
417 	 * some unsent tx buffers */
418 	iowrite16(TM2TX, ioaddr + MTPR);
419 }
420 
r6040_tx_timeout(struct net_device * dev,unsigned int txqueue)421 static void r6040_tx_timeout(struct net_device *dev, unsigned int txqueue)
422 {
423 	struct r6040_private *priv = netdev_priv(dev);
424 	void __iomem *ioaddr = priv->base;
425 
426 	netdev_warn(dev, "transmit timed out, int enable %4.4x "
427 		"status %4.4x\n",
428 		ioread16(ioaddr + MIER),
429 		ioread16(ioaddr + MISR));
430 
431 	dev->stats.tx_errors++;
432 
433 	/* Reset MAC and re-init all registers */
434 	r6040_init_mac_regs(dev);
435 }
436 
r6040_get_stats(struct net_device * dev)437 static struct net_device_stats *r6040_get_stats(struct net_device *dev)
438 {
439 	struct r6040_private *priv = netdev_priv(dev);
440 	void __iomem *ioaddr = priv->base;
441 	unsigned long flags;
442 
443 	spin_lock_irqsave(&priv->lock, flags);
444 	dev->stats.rx_crc_errors += ioread8(ioaddr + ME_CNT1);
445 	dev->stats.multicast += ioread8(ioaddr + ME_CNT0);
446 	spin_unlock_irqrestore(&priv->lock, flags);
447 
448 	return &dev->stats;
449 }
450 
451 /* Stop RDC MAC and Free the allocated resource */
r6040_down(struct net_device * dev)452 static void r6040_down(struct net_device *dev)
453 {
454 	struct r6040_private *lp = netdev_priv(dev);
455 	void __iomem *ioaddr = lp->base;
456 	const u16 *adrp;
457 
458 	/* Stop MAC */
459 	iowrite16(MSK_INT, ioaddr + MIER);	/* Mask Off Interrupt */
460 
461 	/* Reset RDC MAC */
462 	r6040_reset_mac(lp);
463 
464 	/* Restore MAC Address to MIDx */
465 	adrp = (const u16 *) dev->dev_addr;
466 	iowrite16(adrp[0], ioaddr + MID_0L);
467 	iowrite16(adrp[1], ioaddr + MID_0M);
468 	iowrite16(adrp[2], ioaddr + MID_0H);
469 }
470 
r6040_close(struct net_device * dev)471 static int r6040_close(struct net_device *dev)
472 {
473 	struct r6040_private *lp = netdev_priv(dev);
474 	struct pci_dev *pdev = lp->pdev;
475 
476 	phy_stop(dev->phydev);
477 	napi_disable(&lp->napi);
478 	netif_stop_queue(dev);
479 
480 	spin_lock_irq(&lp->lock);
481 	r6040_down(dev);
482 
483 	/* Free RX buffer */
484 	r6040_free_rxbufs(dev);
485 
486 	/* Free TX buffer */
487 	r6040_free_txbufs(dev);
488 
489 	spin_unlock_irq(&lp->lock);
490 
491 	free_irq(dev->irq, dev);
492 
493 	/* Free Descriptor memory */
494 	if (lp->rx_ring) {
495 		dma_free_coherent(&pdev->dev, RX_DESC_SIZE, lp->rx_ring,
496 				  lp->rx_ring_dma);
497 		lp->rx_ring = NULL;
498 	}
499 
500 	if (lp->tx_ring) {
501 		dma_free_coherent(&pdev->dev, TX_DESC_SIZE, lp->tx_ring,
502 				  lp->tx_ring_dma);
503 		lp->tx_ring = NULL;
504 	}
505 
506 	return 0;
507 }
508 
r6040_rx(struct net_device * dev,int limit)509 static int r6040_rx(struct net_device *dev, int limit)
510 {
511 	struct r6040_private *priv = netdev_priv(dev);
512 	struct r6040_descriptor *descptr = priv->rx_remove_ptr;
513 	struct sk_buff *skb_ptr, *new_skb;
514 	int count = 0;
515 	u16 err;
516 
517 	/* Limit not reached and the descriptor belongs to the CPU */
518 	while (count < limit && !(descptr->status & DSC_OWNER_MAC)) {
519 		/* Read the descriptor status */
520 		err = descptr->status;
521 		/* Global error status set */
522 		if (err & DSC_RX_ERR) {
523 			/* RX dribble */
524 			if (err & DSC_RX_ERR_DRI)
525 				dev->stats.rx_frame_errors++;
526 			/* Buffer length exceeded */
527 			if (err & DSC_RX_ERR_BUF)
528 				dev->stats.rx_length_errors++;
529 			/* Packet too long */
530 			if (err & DSC_RX_ERR_LONG)
531 				dev->stats.rx_length_errors++;
532 			/* Packet < 64 bytes */
533 			if (err & DSC_RX_ERR_RUNT)
534 				dev->stats.rx_length_errors++;
535 			/* CRC error */
536 			if (err & DSC_RX_ERR_CRC) {
537 				spin_lock(&priv->lock);
538 				dev->stats.rx_crc_errors++;
539 				spin_unlock(&priv->lock);
540 			}
541 			goto next_descr;
542 		}
543 
544 		/* Packet successfully received */
545 		new_skb = netdev_alloc_skb(dev, MAX_BUF_SIZE);
546 		if (!new_skb) {
547 			dev->stats.rx_dropped++;
548 			goto next_descr;
549 		}
550 		skb_ptr = descptr->skb_ptr;
551 		skb_ptr->dev = priv->dev;
552 
553 		/* Do not count the CRC */
554 		skb_put(skb_ptr, descptr->len - ETH_FCS_LEN);
555 		dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf),
556 				 MAX_BUF_SIZE, DMA_FROM_DEVICE);
557 		skb_ptr->protocol = eth_type_trans(skb_ptr, priv->dev);
558 
559 		/* Send to upper layer */
560 		netif_receive_skb(skb_ptr);
561 		dev->stats.rx_packets++;
562 		dev->stats.rx_bytes += descptr->len - ETH_FCS_LEN;
563 
564 		/* put new skb into descriptor */
565 		descptr->skb_ptr = new_skb;
566 		descptr->buf = cpu_to_le32(dma_map_single(&priv->pdev->dev,
567 							  descptr->skb_ptr->data,
568 							  MAX_BUF_SIZE,
569 							  DMA_FROM_DEVICE));
570 
571 next_descr:
572 		/* put the descriptor back to the MAC */
573 		descptr->status = DSC_OWNER_MAC;
574 		descptr = descptr->vndescp;
575 		count++;
576 	}
577 	priv->rx_remove_ptr = descptr;
578 
579 	return count;
580 }
581 
r6040_tx(struct net_device * dev)582 static void r6040_tx(struct net_device *dev)
583 {
584 	struct r6040_private *priv = netdev_priv(dev);
585 	struct r6040_descriptor *descptr;
586 	void __iomem *ioaddr = priv->base;
587 	struct sk_buff *skb_ptr;
588 	u16 err;
589 
590 	spin_lock(&priv->lock);
591 	descptr = priv->tx_remove_ptr;
592 	while (priv->tx_free_desc < TX_DCNT) {
593 		/* Check for errors */
594 		err = ioread16(ioaddr + MLSR);
595 
596 		if (err & TX_FIFO_UNDR)
597 			dev->stats.tx_fifo_errors++;
598 		if (err & (TX_EXCEEDC | TX_LATEC))
599 			dev->stats.tx_carrier_errors++;
600 
601 		if (descptr->status & DSC_OWNER_MAC)
602 			break; /* Not complete */
603 		skb_ptr = descptr->skb_ptr;
604 
605 		/* Statistic Counter */
606 		dev->stats.tx_packets++;
607 		dev->stats.tx_bytes += skb_ptr->len;
608 
609 		dma_unmap_single(&priv->pdev->dev, le32_to_cpu(descptr->buf),
610 				 skb_ptr->len, DMA_TO_DEVICE);
611 		/* Free buffer */
612 		dev_kfree_skb(skb_ptr);
613 		descptr->skb_ptr = NULL;
614 		/* To next descriptor */
615 		descptr = descptr->vndescp;
616 		priv->tx_free_desc++;
617 	}
618 	priv->tx_remove_ptr = descptr;
619 
620 	if (priv->tx_free_desc)
621 		netif_wake_queue(dev);
622 	spin_unlock(&priv->lock);
623 }
624 
r6040_poll(struct napi_struct * napi,int budget)625 static int r6040_poll(struct napi_struct *napi, int budget)
626 {
627 	struct r6040_private *priv =
628 		container_of(napi, struct r6040_private, napi);
629 	struct net_device *dev = priv->dev;
630 	void __iomem *ioaddr = priv->base;
631 	int work_done;
632 
633 	r6040_tx(dev);
634 
635 	work_done = r6040_rx(dev, budget);
636 
637 	if (work_done < budget) {
638 		napi_complete_done(napi, work_done);
639 		/* Enable RX/TX interrupt */
640 		iowrite16(ioread16(ioaddr + MIER) | RX_INTS | TX_INTS,
641 			  ioaddr + MIER);
642 	}
643 	return work_done;
644 }
645 
646 /* The RDC interrupt handler. */
r6040_interrupt(int irq,void * dev_id)647 static irqreturn_t r6040_interrupt(int irq, void *dev_id)
648 {
649 	struct net_device *dev = dev_id;
650 	struct r6040_private *lp = netdev_priv(dev);
651 	void __iomem *ioaddr = lp->base;
652 	u16 misr, status;
653 
654 	/* Save MIER */
655 	misr = ioread16(ioaddr + MIER);
656 	/* Mask off RDC MAC interrupt */
657 	iowrite16(MSK_INT, ioaddr + MIER);
658 	/* Read MISR status and clear */
659 	status = ioread16(ioaddr + MISR);
660 
661 	if (status == 0x0000 || status == 0xffff) {
662 		/* Restore RDC MAC interrupt */
663 		iowrite16(misr, ioaddr + MIER);
664 		return IRQ_NONE;
665 	}
666 
667 	/* RX interrupt request */
668 	if (status & (RX_INTS | TX_INTS)) {
669 		if (status & RX_NO_DESC) {
670 			/* RX descriptor unavailable */
671 			dev->stats.rx_dropped++;
672 			dev->stats.rx_missed_errors++;
673 		}
674 		if (status & RX_FIFO_FULL)
675 			dev->stats.rx_fifo_errors++;
676 
677 		if (likely(napi_schedule_prep(&lp->napi))) {
678 			/* Mask off RX interrupt */
679 			misr &= ~(RX_INTS | TX_INTS);
680 			__napi_schedule_irqoff(&lp->napi);
681 		}
682 	}
683 
684 	/* Restore RDC MAC interrupt */
685 	iowrite16(misr, ioaddr + MIER);
686 
687 	return IRQ_HANDLED;
688 }
689 
690 #ifdef CONFIG_NET_POLL_CONTROLLER
r6040_poll_controller(struct net_device * dev)691 static void r6040_poll_controller(struct net_device *dev)
692 {
693 	disable_irq(dev->irq);
694 	r6040_interrupt(dev->irq, dev);
695 	enable_irq(dev->irq);
696 }
697 #endif
698 
699 /* Init RDC MAC */
r6040_up(struct net_device * dev)700 static int r6040_up(struct net_device *dev)
701 {
702 	struct r6040_private *lp = netdev_priv(dev);
703 	void __iomem *ioaddr = lp->base;
704 	int ret;
705 
706 	/* Initialise and alloc RX/TX buffers */
707 	r6040_init_txbufs(dev);
708 	ret = r6040_alloc_rxbufs(dev);
709 	if (ret)
710 		return ret;
711 
712 	/* improve performance (by RDC guys) */
713 	r6040_phy_write(ioaddr, 30, 17,
714 			(r6040_phy_read(ioaddr, 30, 17) | 0x4000));
715 	r6040_phy_write(ioaddr, 30, 17,
716 			~((~r6040_phy_read(ioaddr, 30, 17)) | 0x2000));
717 	r6040_phy_write(ioaddr, 0, 19, 0x0000);
718 	r6040_phy_write(ioaddr, 0, 30, 0x01F0);
719 
720 	/* Initialize all MAC registers */
721 	r6040_init_mac_regs(dev);
722 
723 	phy_start(dev->phydev);
724 
725 	return 0;
726 }
727 
728 
729 /* Read/set MAC address routines */
r6040_mac_address(struct net_device * dev)730 static void r6040_mac_address(struct net_device *dev)
731 {
732 	struct r6040_private *lp = netdev_priv(dev);
733 	void __iomem *ioaddr = lp->base;
734 	const u16 *adrp;
735 
736 	/* Reset MAC */
737 	r6040_reset_mac(lp);
738 
739 	/* Restore MAC Address */
740 	adrp = (const u16 *) dev->dev_addr;
741 	iowrite16(adrp[0], ioaddr + MID_0L);
742 	iowrite16(adrp[1], ioaddr + MID_0M);
743 	iowrite16(adrp[2], ioaddr + MID_0H);
744 }
745 
r6040_open(struct net_device * dev)746 static int r6040_open(struct net_device *dev)
747 {
748 	struct r6040_private *lp = netdev_priv(dev);
749 	int ret;
750 
751 	/* Request IRQ and Register interrupt handler */
752 	ret = request_irq(dev->irq, r6040_interrupt,
753 		IRQF_SHARED, dev->name, dev);
754 	if (ret)
755 		goto out;
756 
757 	/* Set MAC address */
758 	r6040_mac_address(dev);
759 
760 	/* Allocate Descriptor memory */
761 	lp->rx_ring =
762 		dma_alloc_coherent(&lp->pdev->dev, RX_DESC_SIZE,
763 				   &lp->rx_ring_dma, GFP_KERNEL);
764 	if (!lp->rx_ring) {
765 		ret = -ENOMEM;
766 		goto err_free_irq;
767 	}
768 
769 	lp->tx_ring =
770 		dma_alloc_coherent(&lp->pdev->dev, TX_DESC_SIZE,
771 				   &lp->tx_ring_dma, GFP_KERNEL);
772 	if (!lp->tx_ring) {
773 		ret = -ENOMEM;
774 		goto err_free_rx_ring;
775 	}
776 
777 	ret = r6040_up(dev);
778 	if (ret)
779 		goto err_free_tx_ring;
780 
781 	napi_enable(&lp->napi);
782 	netif_start_queue(dev);
783 
784 	return 0;
785 
786 err_free_tx_ring:
787 	dma_free_coherent(&lp->pdev->dev, TX_DESC_SIZE, lp->tx_ring,
788 			  lp->tx_ring_dma);
789 err_free_rx_ring:
790 	dma_free_coherent(&lp->pdev->dev, RX_DESC_SIZE, lp->rx_ring,
791 			  lp->rx_ring_dma);
792 err_free_irq:
793 	free_irq(dev->irq, dev);
794 out:
795 	return ret;
796 }
797 
r6040_start_xmit(struct sk_buff * skb,struct net_device * dev)798 static netdev_tx_t r6040_start_xmit(struct sk_buff *skb,
799 				    struct net_device *dev)
800 {
801 	struct r6040_private *lp = netdev_priv(dev);
802 	struct r6040_descriptor *descptr;
803 	void __iomem *ioaddr = lp->base;
804 	unsigned long flags;
805 
806 	if (skb_put_padto(skb, ETH_ZLEN) < 0)
807 		return NETDEV_TX_OK;
808 
809 	/* Critical Section */
810 	spin_lock_irqsave(&lp->lock, flags);
811 
812 	/* TX resource check */
813 	if (!lp->tx_free_desc) {
814 		spin_unlock_irqrestore(&lp->lock, flags);
815 		netif_stop_queue(dev);
816 		netdev_err(dev, ": no tx descriptor\n");
817 		return NETDEV_TX_BUSY;
818 	}
819 
820 	/* Set TX descriptor & Transmit it */
821 	lp->tx_free_desc--;
822 	descptr = lp->tx_insert_ptr;
823 	descptr->len = skb->len;
824 	descptr->skb_ptr = skb;
825 	descptr->buf = cpu_to_le32(dma_map_single(&lp->pdev->dev, skb->data,
826 						  skb->len, DMA_TO_DEVICE));
827 	descptr->status = DSC_OWNER_MAC;
828 
829 	skb_tx_timestamp(skb);
830 
831 	/* Trigger the MAC to check the TX descriptor */
832 	if (!netdev_xmit_more() || netif_queue_stopped(dev))
833 		iowrite16(TM2TX, ioaddr + MTPR);
834 	lp->tx_insert_ptr = descptr->vndescp;
835 
836 	/* If no tx resource, stop */
837 	if (!lp->tx_free_desc)
838 		netif_stop_queue(dev);
839 
840 	spin_unlock_irqrestore(&lp->lock, flags);
841 
842 	return NETDEV_TX_OK;
843 }
844 
r6040_multicast_list(struct net_device * dev)845 static void r6040_multicast_list(struct net_device *dev)
846 {
847 	struct r6040_private *lp = netdev_priv(dev);
848 	void __iomem *ioaddr = lp->base;
849 	unsigned long flags;
850 	struct netdev_hw_addr *ha;
851 	int i;
852 	const u16 *adrp;
853 	u16 hash_table[4] = { 0 };
854 
855 	spin_lock_irqsave(&lp->lock, flags);
856 
857 	/* Keep our MAC Address */
858 	adrp = (const u16 *)dev->dev_addr;
859 	iowrite16(adrp[0], ioaddr + MID_0L);
860 	iowrite16(adrp[1], ioaddr + MID_0M);
861 	iowrite16(adrp[2], ioaddr + MID_0H);
862 
863 	/* Clear AMCP & PROM bits */
864 	lp->mcr0 = ioread16(ioaddr + MCR0) & ~(MCR0_PROMISC | MCR0_HASH_EN);
865 
866 	/* Promiscuous mode */
867 	if (dev->flags & IFF_PROMISC)
868 		lp->mcr0 |= MCR0_PROMISC;
869 
870 	/* Enable multicast hash table function to
871 	 * receive all multicast packets. */
872 	else if (dev->flags & IFF_ALLMULTI) {
873 		lp->mcr0 |= MCR0_HASH_EN;
874 
875 		for (i = 0; i < MCAST_MAX ; i++) {
876 			iowrite16(0, ioaddr + MID_1L + 8 * i);
877 			iowrite16(0, ioaddr + MID_1M + 8 * i);
878 			iowrite16(0, ioaddr + MID_1H + 8 * i);
879 		}
880 
881 		for (i = 0; i < 4; i++)
882 			hash_table[i] = 0xffff;
883 	}
884 	/* Use internal multicast address registers if the number of
885 	 * multicast addresses is not greater than MCAST_MAX. */
886 	else if (netdev_mc_count(dev) <= MCAST_MAX) {
887 		i = 0;
888 		netdev_for_each_mc_addr(ha, dev) {
889 			u16 *adrp = (u16 *) ha->addr;
890 			iowrite16(adrp[0], ioaddr + MID_1L + 8 * i);
891 			iowrite16(adrp[1], ioaddr + MID_1M + 8 * i);
892 			iowrite16(adrp[2], ioaddr + MID_1H + 8 * i);
893 			i++;
894 		}
895 		while (i < MCAST_MAX) {
896 			iowrite16(0, ioaddr + MID_1L + 8 * i);
897 			iowrite16(0, ioaddr + MID_1M + 8 * i);
898 			iowrite16(0, ioaddr + MID_1H + 8 * i);
899 			i++;
900 		}
901 	}
902 	/* Otherwise, Enable multicast hash table function. */
903 	else {
904 		u32 crc;
905 
906 		lp->mcr0 |= MCR0_HASH_EN;
907 
908 		for (i = 0; i < MCAST_MAX ; i++) {
909 			iowrite16(0, ioaddr + MID_1L + 8 * i);
910 			iowrite16(0, ioaddr + MID_1M + 8 * i);
911 			iowrite16(0, ioaddr + MID_1H + 8 * i);
912 		}
913 
914 		/* Build multicast hash table */
915 		netdev_for_each_mc_addr(ha, dev) {
916 			u8 *addrs = ha->addr;
917 
918 			crc = ether_crc(ETH_ALEN, addrs);
919 			crc >>= 26;
920 			hash_table[crc >> 4] |= 1 << (crc & 0xf);
921 		}
922 	}
923 
924 	iowrite16(lp->mcr0, ioaddr + MCR0);
925 
926 	/* Fill the MAC hash tables with their values */
927 	if (lp->mcr0 & MCR0_HASH_EN) {
928 		iowrite16(hash_table[0], ioaddr + MAR0);
929 		iowrite16(hash_table[1], ioaddr + MAR1);
930 		iowrite16(hash_table[2], ioaddr + MAR2);
931 		iowrite16(hash_table[3], ioaddr + MAR3);
932 	}
933 
934 	spin_unlock_irqrestore(&lp->lock, flags);
935 }
936 
netdev_get_drvinfo(struct net_device * dev,struct ethtool_drvinfo * info)937 static void netdev_get_drvinfo(struct net_device *dev,
938 			struct ethtool_drvinfo *info)
939 {
940 	struct r6040_private *rp = netdev_priv(dev);
941 
942 	strscpy(info->driver, DRV_NAME, sizeof(info->driver));
943 	strscpy(info->version, DRV_VERSION, sizeof(info->version));
944 	strscpy(info->bus_info, pci_name(rp->pdev), sizeof(info->bus_info));
945 }
946 
947 static const struct ethtool_ops netdev_ethtool_ops = {
948 	.get_drvinfo		= netdev_get_drvinfo,
949 	.get_link		= ethtool_op_get_link,
950 	.get_ts_info		= ethtool_op_get_ts_info,
951 	.get_link_ksettings     = phy_ethtool_get_link_ksettings,
952 	.set_link_ksettings     = phy_ethtool_set_link_ksettings,
953 	.nway_reset		= phy_ethtool_nway_reset,
954 };
955 
956 static const struct net_device_ops r6040_netdev_ops = {
957 	.ndo_open		= r6040_open,
958 	.ndo_stop		= r6040_close,
959 	.ndo_start_xmit		= r6040_start_xmit,
960 	.ndo_get_stats		= r6040_get_stats,
961 	.ndo_set_rx_mode	= r6040_multicast_list,
962 	.ndo_validate_addr	= eth_validate_addr,
963 	.ndo_set_mac_address	= eth_mac_addr,
964 	.ndo_eth_ioctl		= phy_do_ioctl,
965 	.ndo_tx_timeout		= r6040_tx_timeout,
966 #ifdef CONFIG_NET_POLL_CONTROLLER
967 	.ndo_poll_controller	= r6040_poll_controller,
968 #endif
969 };
970 
r6040_adjust_link(struct net_device * dev)971 static void r6040_adjust_link(struct net_device *dev)
972 {
973 	struct r6040_private *lp = netdev_priv(dev);
974 	struct phy_device *phydev = dev->phydev;
975 	int status_changed = 0;
976 	void __iomem *ioaddr = lp->base;
977 
978 	BUG_ON(!phydev);
979 
980 	if (lp->old_link != phydev->link) {
981 		status_changed = 1;
982 		lp->old_link = phydev->link;
983 	}
984 
985 	/* reflect duplex change */
986 	if (phydev->link && (lp->old_duplex != phydev->duplex)) {
987 		lp->mcr0 |= (phydev->duplex == DUPLEX_FULL ? MCR0_FD : 0);
988 		iowrite16(lp->mcr0, ioaddr);
989 
990 		status_changed = 1;
991 		lp->old_duplex = phydev->duplex;
992 	}
993 
994 	if (status_changed)
995 		phy_print_status(phydev);
996 }
997 
r6040_mii_probe(struct net_device * dev)998 static int r6040_mii_probe(struct net_device *dev)
999 {
1000 	struct r6040_private *lp = netdev_priv(dev);
1001 	struct phy_device *phydev = NULL;
1002 
1003 	phydev = phy_find_first(lp->mii_bus);
1004 	if (!phydev) {
1005 		dev_err(&lp->pdev->dev, "no PHY found\n");
1006 		return -ENODEV;
1007 	}
1008 
1009 	phydev = phy_connect(dev, phydev_name(phydev), &r6040_adjust_link,
1010 			     PHY_INTERFACE_MODE_MII);
1011 
1012 	if (IS_ERR(phydev)) {
1013 		dev_err(&lp->pdev->dev, "could not attach to PHY\n");
1014 		return PTR_ERR(phydev);
1015 	}
1016 
1017 	phy_set_max_speed(phydev, SPEED_100);
1018 
1019 	lp->old_link = 0;
1020 	lp->old_duplex = -1;
1021 
1022 	phy_attached_info(phydev);
1023 
1024 	return 0;
1025 }
1026 
r6040_init_one(struct pci_dev * pdev,const struct pci_device_id * ent)1027 static int r6040_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
1028 {
1029 	struct net_device *dev;
1030 	struct r6040_private *lp;
1031 	void __iomem *ioaddr;
1032 	int err, io_size = R6040_IO_SIZE;
1033 	static int card_idx = -1;
1034 	u16 addr[ETH_ALEN / 2];
1035 	int bar = 0;
1036 
1037 	pr_info("%s\n", version);
1038 
1039 	err = pci_enable_device(pdev);
1040 	if (err)
1041 		goto err_out;
1042 
1043 	/* this should always be supported */
1044 	err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
1045 	if (err) {
1046 		dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n");
1047 		goto err_out_disable_dev;
1048 	}
1049 	err = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
1050 	if (err) {
1051 		dev_err(&pdev->dev, "32-bit PCI DMA addresses not supported by the card\n");
1052 		goto err_out_disable_dev;
1053 	}
1054 
1055 	/* IO Size check */
1056 	if (pci_resource_len(pdev, bar) < io_size) {
1057 		dev_err(&pdev->dev, "Insufficient PCI resources, aborting\n");
1058 		err = -EIO;
1059 		goto err_out_disable_dev;
1060 	}
1061 
1062 	pci_set_master(pdev);
1063 
1064 	dev = alloc_etherdev(sizeof(struct r6040_private));
1065 	if (!dev) {
1066 		err = -ENOMEM;
1067 		goto err_out_disable_dev;
1068 	}
1069 	SET_NETDEV_DEV(dev, &pdev->dev);
1070 	lp = netdev_priv(dev);
1071 
1072 	err = pci_request_regions(pdev, DRV_NAME);
1073 
1074 	if (err) {
1075 		dev_err(&pdev->dev, "Failed to request PCI regions\n");
1076 		goto err_out_free_dev;
1077 	}
1078 
1079 	ioaddr = pci_iomap(pdev, bar, io_size);
1080 	if (!ioaddr) {
1081 		dev_err(&pdev->dev, "ioremap failed for device\n");
1082 		err = -EIO;
1083 		goto err_out_free_res;
1084 	}
1085 
1086 	/* If PHY status change register is still set to zero it means the
1087 	 * bootloader didn't initialize it, so we set it to:
1088 	 * - enable phy status change
1089 	 * - enable all phy addresses
1090 	 * - set to lowest timer divider */
1091 	if (ioread16(ioaddr + PHY_CC) == 0)
1092 		iowrite16(SCEN | PHY_MAX_ADDR << PHYAD_SHIFT |
1093 				7 << TMRDIV_SHIFT, ioaddr + PHY_CC);
1094 
1095 	/* Init system & device */
1096 	lp->base = ioaddr;
1097 	dev->irq = pdev->irq;
1098 
1099 	spin_lock_init(&lp->lock);
1100 	pci_set_drvdata(pdev, dev);
1101 
1102 	/* Set MAC address */
1103 	card_idx++;
1104 
1105 	addr[0] = ioread16(ioaddr + MID_0L);
1106 	addr[1] = ioread16(ioaddr + MID_0M);
1107 	addr[2] = ioread16(ioaddr + MID_0H);
1108 	eth_hw_addr_set(dev, (u8 *)addr);
1109 
1110 	/* Some bootloader/BIOSes do not initialize
1111 	 * MAC address, warn about that */
1112 	if (!(addr[0] || addr[1] || addr[2])) {
1113 		netdev_warn(dev, "MAC address not initialized, "
1114 					"generating random\n");
1115 		eth_hw_addr_random(dev);
1116 	}
1117 
1118 	/* Link new device into r6040_root_dev */
1119 	lp->pdev = pdev;
1120 	lp->dev = dev;
1121 
1122 	/* Init RDC private data */
1123 	lp->mcr0 = MCR0_XMTEN | MCR0_RCVEN;
1124 
1125 	/* The RDC-specific entries in the device structure. */
1126 	dev->netdev_ops = &r6040_netdev_ops;
1127 	dev->ethtool_ops = &netdev_ethtool_ops;
1128 	dev->watchdog_timeo = TX_TIMEOUT;
1129 
1130 	netif_napi_add(dev, &lp->napi, r6040_poll);
1131 
1132 	lp->mii_bus = mdiobus_alloc();
1133 	if (!lp->mii_bus) {
1134 		dev_err(&pdev->dev, "mdiobus_alloc() failed\n");
1135 		err = -ENOMEM;
1136 		goto err_out_unmap;
1137 	}
1138 
1139 	lp->mii_bus->priv = dev;
1140 	lp->mii_bus->read = r6040_mdiobus_read;
1141 	lp->mii_bus->write = r6040_mdiobus_write;
1142 	lp->mii_bus->name = "r6040_eth_mii";
1143 	snprintf(lp->mii_bus->id, MII_BUS_ID_SIZE, "%s-%x",
1144 		dev_name(&pdev->dev), card_idx);
1145 
1146 	err = mdiobus_register(lp->mii_bus);
1147 	if (err) {
1148 		dev_err(&pdev->dev, "failed to register MII bus\n");
1149 		goto err_out_mdio;
1150 	}
1151 
1152 	err = r6040_mii_probe(dev);
1153 	if (err) {
1154 		dev_err(&pdev->dev, "failed to probe MII bus\n");
1155 		goto err_out_mdio_unregister;
1156 	}
1157 
1158 	/* Register net device. After this dev->name assign */
1159 	err = register_netdev(dev);
1160 	if (err) {
1161 		dev_err(&pdev->dev, "Failed to register net device\n");
1162 		goto err_out_phy_disconnect;
1163 	}
1164 	return 0;
1165 
1166 err_out_phy_disconnect:
1167 	phy_disconnect(dev->phydev);
1168 err_out_mdio_unregister:
1169 	mdiobus_unregister(lp->mii_bus);
1170 err_out_mdio:
1171 	mdiobus_free(lp->mii_bus);
1172 err_out_unmap:
1173 	netif_napi_del(&lp->napi);
1174 	pci_iounmap(pdev, ioaddr);
1175 err_out_free_res:
1176 	pci_release_regions(pdev);
1177 err_out_free_dev:
1178 	free_netdev(dev);
1179 err_out_disable_dev:
1180 	pci_disable_device(pdev);
1181 err_out:
1182 	return err;
1183 }
1184 
r6040_remove_one(struct pci_dev * pdev)1185 static void r6040_remove_one(struct pci_dev *pdev)
1186 {
1187 	struct net_device *dev = pci_get_drvdata(pdev);
1188 	struct r6040_private *lp = netdev_priv(dev);
1189 
1190 	unregister_netdev(dev);
1191 	phy_disconnect(dev->phydev);
1192 	mdiobus_unregister(lp->mii_bus);
1193 	mdiobus_free(lp->mii_bus);
1194 	netif_napi_del(&lp->napi);
1195 	pci_iounmap(pdev, lp->base);
1196 	pci_release_regions(pdev);
1197 	free_netdev(dev);
1198 	pci_disable_device(pdev);
1199 }
1200 
1201 
1202 static const struct pci_device_id r6040_pci_tbl[] = {
1203 	{ PCI_DEVICE(PCI_VENDOR_ID_RDC, 0x6040) },
1204 	{ 0 }
1205 };
1206 MODULE_DEVICE_TABLE(pci, r6040_pci_tbl);
1207 
1208 static struct pci_driver r6040_driver = {
1209 	.name		= DRV_NAME,
1210 	.id_table	= r6040_pci_tbl,
1211 	.probe		= r6040_init_one,
1212 	.remove		= r6040_remove_one,
1213 };
1214 
1215 module_pci_driver(r6040_driver);
1216