1 // SPDX-License-Identifier: GPL-2.0-only
2 /**
3 * drivers/net/ethernet/micrel/ks8851_mll.c
4 * Copyright (c) 2009 Micrel Inc.
5 */
6
7 /* Supports:
8 * KS8851 16bit MLL chip from Micrel Inc.
9 */
10
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/interrupt.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <linux/ethtool.h>
19 #include <linux/cache.h>
20 #include <linux/crc32.h>
21 #include <linux/crc32poly.h>
22 #include <linux/mii.h>
23 #include <linux/platform_device.h>
24 #include <linux/delay.h>
25 #include <linux/slab.h>
26 #include <linux/ks8851_mll.h>
27 #include <linux/of.h>
28 #include <linux/of_device.h>
29 #include <linux/of_net.h>
30
31 #include "ks8851.h"
32
33 #define DRV_NAME "ks8851_mll"
34
35 static u8 KS_DEFAULT_MAC_ADDRESS[] = { 0x00, 0x10, 0xA1, 0x86, 0x95, 0x11 };
36 #define MAX_RECV_FRAMES 255
37 #define MAX_BUF_SIZE 2048
38 #define TX_BUF_SIZE 2000
39 #define RX_BUF_SIZE 2000
40
41 #define RXCR1_FILTER_MASK (RXCR1_RXINVF | RXCR1_RXAE | \
42 RXCR1_RXMAFMA | RXCR1_RXPAFMA)
43 #define RXQCR_CMD_CNTL (RXQCR_RXFCTE|RXQCR_ADRFE)
44
45 #define ENUM_BUS_NONE 0
46 #define ENUM_BUS_8BIT 1
47 #define ENUM_BUS_16BIT 2
48 #define ENUM_BUS_32BIT 3
49
50 #define MAX_MCAST_LST 32
51 #define HW_MCAST_SIZE 8
52
53 /**
54 * union ks_tx_hdr - tx header data
55 * @txb: The header as bytes
56 * @txw: The header as 16bit, little-endian words
57 *
58 * A dual representation of the tx header data to allow
59 * access to individual bytes, and to allow 16bit accesses
60 * with 16bit alignment.
61 */
62 union ks_tx_hdr {
63 u8 txb[4];
64 __le16 txw[2];
65 };
66
67 /**
68 * struct ks_net - KS8851 driver private data
69 * @net_device : The network device we're bound to
70 * @hw_addr : start address of data register.
71 * @hw_addr_cmd : start address of command register.
72 * @txh : temporaly buffer to save status/length.
73 * @lock : Lock to ensure that the device is not accessed when busy.
74 * @pdev : Pointer to platform device.
75 * @mii : The MII state information for the mii calls.
76 * @frame_head_info : frame header information for multi-pkt rx.
77 * @statelock : Lock on this structure for tx list.
78 * @msg_enable : The message flags controlling driver output (see ethtool).
79 * @frame_cnt : number of frames received.
80 * @bus_width : i/o bus width.
81 * @rc_rxqcr : Cached copy of KS_RXQCR.
82 * @rc_txcr : Cached copy of KS_TXCR.
83 * @rc_ier : Cached copy of KS_IER.
84 * @sharedbus : Multipex(addr and data bus) mode indicator.
85 * @cmd_reg_cache : command register cached.
86 * @cmd_reg_cache_int : command register cached. Used in the irq handler.
87 * @promiscuous : promiscuous mode indicator.
88 * @all_mcast : mutlicast indicator.
89 * @mcast_lst_size : size of multicast list.
90 * @mcast_lst : multicast list.
91 * @mcast_bits : multicast enabed.
92 * @mac_addr : MAC address assigned to this device.
93 * @fid : frame id.
94 * @extra_byte : number of extra byte prepended rx pkt.
95 * @enabled : indicator this device works.
96 *
97 * The @lock ensures that the chip is protected when certain operations are
98 * in progress. When the read or write packet transfer is in progress, most
99 * of the chip registers are not accessible until the transfer is finished and
100 * the DMA has been de-asserted.
101 *
102 * The @statelock is used to protect information in the structure which may
103 * need to be accessed via several sources, such as the network driver layer
104 * or one of the work queues.
105 *
106 */
107
108 /* Receive multiplex framer header info */
109 struct type_frame_head {
110 u16 sts; /* Frame status */
111 u16 len; /* Byte count */
112 };
113
114 struct ks_net {
115 struct net_device *netdev;
116 void __iomem *hw_addr;
117 void __iomem *hw_addr_cmd;
118 union ks_tx_hdr txh ____cacheline_aligned;
119 struct mutex lock; /* spinlock to be interrupt safe */
120 struct platform_device *pdev;
121 struct mii_if_info mii;
122 struct type_frame_head *frame_head_info;
123 spinlock_t statelock;
124 u32 msg_enable;
125 u32 frame_cnt;
126 int bus_width;
127
128 u16 rc_rxqcr;
129 u16 rc_txcr;
130 u16 rc_ier;
131 u16 sharedbus;
132 u16 cmd_reg_cache;
133 u16 cmd_reg_cache_int;
134 u16 promiscuous;
135 u16 all_mcast;
136 u16 mcast_lst_size;
137 u8 mcast_lst[MAX_MCAST_LST][ETH_ALEN];
138 u8 mcast_bits[HW_MCAST_SIZE];
139 u8 mac_addr[6];
140 u8 fid;
141 u8 extra_byte;
142 u8 enabled;
143 };
144
145 static int msg_enable;
146
147 #define BE3 0x8000 /* Byte Enable 3 */
148 #define BE2 0x4000 /* Byte Enable 2 */
149 #define BE1 0x2000 /* Byte Enable 1 */
150 #define BE0 0x1000 /* Byte Enable 0 */
151
152 /* register read/write calls.
153 *
154 * All these calls issue transactions to access the chip's registers. They
155 * all require that the necessary lock is held to prevent accesses when the
156 * chip is busy transferring packet data (RX/TX FIFO accesses).
157 */
158
159 /**
160 * ks_rdreg8 - read 8 bit register from device
161 * @ks : The chip information
162 * @offset: The register address
163 *
164 * Read a 8bit register from the chip, returning the result
165 */
ks_rdreg8(struct ks_net * ks,int offset)166 static u8 ks_rdreg8(struct ks_net *ks, int offset)
167 {
168 u16 data;
169 u8 shift_bit = offset & 0x03;
170 u8 shift_data = (offset & 1) << 3;
171 ks->cmd_reg_cache = (u16) offset | (u16)(BE0 << shift_bit);
172 iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
173 data = ioread16(ks->hw_addr);
174 return (u8)(data >> shift_data);
175 }
176
177 /**
178 * ks_rdreg16 - read 16 bit register from device
179 * @ks : The chip information
180 * @offset: The register address
181 *
182 * Read a 16bit register from the chip, returning the result
183 */
184
ks_rdreg16(struct ks_net * ks,int offset)185 static u16 ks_rdreg16(struct ks_net *ks, int offset)
186 {
187 ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
188 iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
189 return ioread16(ks->hw_addr);
190 }
191
192 /**
193 * ks_wrreg8 - write 8bit register value to chip
194 * @ks: The chip information
195 * @offset: The register address
196 * @value: The value to write
197 *
198 */
ks_wrreg8(struct ks_net * ks,int offset,u8 value)199 static void ks_wrreg8(struct ks_net *ks, int offset, u8 value)
200 {
201 u8 shift_bit = (offset & 0x03);
202 u16 value_write = (u16)(value << ((offset & 1) << 3));
203 ks->cmd_reg_cache = (u16)offset | (BE0 << shift_bit);
204 iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
205 iowrite16(value_write, ks->hw_addr);
206 }
207
208 /**
209 * ks_wrreg16 - write 16bit register value to chip
210 * @ks: The chip information
211 * @offset: The register address
212 * @value: The value to write
213 *
214 */
215
ks_wrreg16(struct ks_net * ks,int offset,u16 value)216 static void ks_wrreg16(struct ks_net *ks, int offset, u16 value)
217 {
218 ks->cmd_reg_cache = (u16)offset | ((BE1 | BE0) << (offset & 0x02));
219 iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
220 iowrite16(value, ks->hw_addr);
221 }
222
223 /**
224 * ks_inblk - read a block of data from QMU. This is called after sudo DMA mode enabled.
225 * @ks: The chip state
226 * @wptr: buffer address to save data
227 * @len: length in byte to read
228 *
229 */
ks_inblk(struct ks_net * ks,u16 * wptr,u32 len)230 static inline void ks_inblk(struct ks_net *ks, u16 *wptr, u32 len)
231 {
232 len >>= 1;
233 while (len--)
234 *wptr++ = (u16)ioread16(ks->hw_addr);
235 }
236
237 /**
238 * ks_outblk - write data to QMU. This is called after sudo DMA mode enabled.
239 * @ks: The chip information
240 * @wptr: buffer address
241 * @len: length in byte to write
242 *
243 */
ks_outblk(struct ks_net * ks,u16 * wptr,u32 len)244 static inline void ks_outblk(struct ks_net *ks, u16 *wptr, u32 len)
245 {
246 len >>= 1;
247 while (len--)
248 iowrite16(*wptr++, ks->hw_addr);
249 }
250
ks_disable_int(struct ks_net * ks)251 static void ks_disable_int(struct ks_net *ks)
252 {
253 ks_wrreg16(ks, KS_IER, 0x0000);
254 } /* ks_disable_int */
255
ks_enable_int(struct ks_net * ks)256 static void ks_enable_int(struct ks_net *ks)
257 {
258 ks_wrreg16(ks, KS_IER, ks->rc_ier);
259 } /* ks_enable_int */
260
261 /**
262 * ks_tx_fifo_space - return the available hardware buffer size.
263 * @ks: The chip information
264 *
265 */
ks_tx_fifo_space(struct ks_net * ks)266 static inline u16 ks_tx_fifo_space(struct ks_net *ks)
267 {
268 return ks_rdreg16(ks, KS_TXMIR) & 0x1fff;
269 }
270
271 /**
272 * ks_save_cmd_reg - save the command register from the cache.
273 * @ks: The chip information
274 *
275 */
ks_save_cmd_reg(struct ks_net * ks)276 static inline void ks_save_cmd_reg(struct ks_net *ks)
277 {
278 /*ks8851 MLL has a bug to read back the command register.
279 * So rely on software to save the content of command register.
280 */
281 ks->cmd_reg_cache_int = ks->cmd_reg_cache;
282 }
283
284 /**
285 * ks_restore_cmd_reg - restore the command register from the cache and
286 * write to hardware register.
287 * @ks: The chip information
288 *
289 */
ks_restore_cmd_reg(struct ks_net * ks)290 static inline void ks_restore_cmd_reg(struct ks_net *ks)
291 {
292 ks->cmd_reg_cache = ks->cmd_reg_cache_int;
293 iowrite16(ks->cmd_reg_cache, ks->hw_addr_cmd);
294 }
295
296 /**
297 * ks_set_powermode - set power mode of the device
298 * @ks: The chip information
299 * @pwrmode: The power mode value to write to KS_PMECR.
300 *
301 * Change the power mode of the chip.
302 */
ks_set_powermode(struct ks_net * ks,unsigned pwrmode)303 static void ks_set_powermode(struct ks_net *ks, unsigned pwrmode)
304 {
305 unsigned pmecr;
306
307 netif_dbg(ks, hw, ks->netdev, "setting power mode %d\n", pwrmode);
308
309 ks_rdreg16(ks, KS_GRR);
310 pmecr = ks_rdreg16(ks, KS_PMECR);
311 pmecr &= ~PMECR_PM_MASK;
312 pmecr |= pwrmode;
313
314 ks_wrreg16(ks, KS_PMECR, pmecr);
315 }
316
317 /**
318 * ks_read_config - read chip configuration of bus width.
319 * @ks: The chip information
320 *
321 */
ks_read_config(struct ks_net * ks)322 static void ks_read_config(struct ks_net *ks)
323 {
324 u16 reg_data = 0;
325
326 /* Regardless of bus width, 8 bit read should always work.*/
327 reg_data = ks_rdreg8(ks, KS_CCR) & 0x00FF;
328 reg_data |= ks_rdreg8(ks, KS_CCR+1) << 8;
329
330 /* addr/data bus are multiplexed */
331 ks->sharedbus = (reg_data & CCR_SHARED) == CCR_SHARED;
332
333 /* There are garbage data when reading data from QMU,
334 depending on bus-width.
335 */
336
337 if (reg_data & CCR_8BIT) {
338 ks->bus_width = ENUM_BUS_8BIT;
339 ks->extra_byte = 1;
340 } else if (reg_data & CCR_16BIT) {
341 ks->bus_width = ENUM_BUS_16BIT;
342 ks->extra_byte = 2;
343 } else {
344 ks->bus_width = ENUM_BUS_32BIT;
345 ks->extra_byte = 4;
346 }
347 }
348
349 /**
350 * ks_soft_reset - issue one of the soft reset to the device
351 * @ks: The device state.
352 * @op: The bit(s) to set in the GRR
353 *
354 * Issue the relevant soft-reset command to the device's GRR register
355 * specified by @op.
356 *
357 * Note, the delays are in there as a caution to ensure that the reset
358 * has time to take effect and then complete. Since the datasheet does
359 * not currently specify the exact sequence, we have chosen something
360 * that seems to work with our device.
361 */
ks_soft_reset(struct ks_net * ks,unsigned op)362 static void ks_soft_reset(struct ks_net *ks, unsigned op)
363 {
364 /* Disable interrupt first */
365 ks_wrreg16(ks, KS_IER, 0x0000);
366 ks_wrreg16(ks, KS_GRR, op);
367 mdelay(10); /* wait a short time to effect reset */
368 ks_wrreg16(ks, KS_GRR, 0);
369 mdelay(1); /* wait for condition to clear */
370 }
371
372
ks_enable_qmu(struct ks_net * ks)373 static void ks_enable_qmu(struct ks_net *ks)
374 {
375 u16 w;
376
377 w = ks_rdreg16(ks, KS_TXCR);
378 /* Enables QMU Transmit (TXCR). */
379 ks_wrreg16(ks, KS_TXCR, w | TXCR_TXE);
380
381 /*
382 * RX Frame Count Threshold Enable and Auto-Dequeue RXQ Frame
383 * Enable
384 */
385
386 w = ks_rdreg16(ks, KS_RXQCR);
387 ks_wrreg16(ks, KS_RXQCR, w | RXQCR_RXFCTE);
388
389 /* Enables QMU Receive (RXCR1). */
390 w = ks_rdreg16(ks, KS_RXCR1);
391 ks_wrreg16(ks, KS_RXCR1, w | RXCR1_RXE);
392 ks->enabled = true;
393 } /* ks_enable_qmu */
394
ks_disable_qmu(struct ks_net * ks)395 static void ks_disable_qmu(struct ks_net *ks)
396 {
397 u16 w;
398
399 w = ks_rdreg16(ks, KS_TXCR);
400
401 /* Disables QMU Transmit (TXCR). */
402 w &= ~TXCR_TXE;
403 ks_wrreg16(ks, KS_TXCR, w);
404
405 /* Disables QMU Receive (RXCR1). */
406 w = ks_rdreg16(ks, KS_RXCR1);
407 w &= ~RXCR1_RXE ;
408 ks_wrreg16(ks, KS_RXCR1, w);
409
410 ks->enabled = false;
411
412 } /* ks_disable_qmu */
413
414 /**
415 * ks_read_qmu - read 1 pkt data from the QMU.
416 * @ks: The chip information
417 * @buf: buffer address to save 1 pkt
418 * @len: Pkt length
419 * Here is the sequence to read 1 pkt:
420 * 1. set sudo DMA mode
421 * 2. read prepend data
422 * 3. read pkt data
423 * 4. reset sudo DMA Mode
424 */
ks_read_qmu(struct ks_net * ks,u16 * buf,u32 len)425 static inline void ks_read_qmu(struct ks_net *ks, u16 *buf, u32 len)
426 {
427 u32 r = ks->extra_byte & 0x1 ;
428 u32 w = ks->extra_byte - r;
429
430 /* 1. set sudo DMA mode */
431 ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
432 ks_wrreg8(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_SDA) & 0xff);
433
434 /* 2. read prepend data */
435 /**
436 * read 4 + extra bytes and discard them.
437 * extra bytes for dummy, 2 for status, 2 for len
438 */
439
440 /* use likely(r) for 8 bit access for performance */
441 if (unlikely(r))
442 ioread8(ks->hw_addr);
443 ks_inblk(ks, buf, w + 2 + 2);
444
445 /* 3. read pkt data */
446 ks_inblk(ks, buf, ALIGN(len, 4));
447
448 /* 4. reset sudo DMA Mode */
449 ks_wrreg8(ks, KS_RXQCR, ks->rc_rxqcr);
450 }
451
452 /**
453 * ks_rcv - read multiple pkts data from the QMU.
454 * @ks: The chip information
455 * @netdev: The network device being opened.
456 *
457 * Read all of header information before reading pkt content.
458 * It is not allowed only port of pkts in QMU after issuing
459 * interrupt ack.
460 */
ks_rcv(struct ks_net * ks,struct net_device * netdev)461 static void ks_rcv(struct ks_net *ks, struct net_device *netdev)
462 {
463 u32 i;
464 struct type_frame_head *frame_hdr = ks->frame_head_info;
465 struct sk_buff *skb;
466
467 ks->frame_cnt = ks_rdreg16(ks, KS_RXFCTR) >> 8;
468
469 /* read all header information */
470 for (i = 0; i < ks->frame_cnt; i++) {
471 /* Checking Received packet status */
472 frame_hdr->sts = ks_rdreg16(ks, KS_RXFHSR);
473 /* Get packet len from hardware */
474 frame_hdr->len = ks_rdreg16(ks, KS_RXFHBCR);
475 frame_hdr++;
476 }
477
478 frame_hdr = ks->frame_head_info;
479 while (ks->frame_cnt--) {
480 if (unlikely(!(frame_hdr->sts & RXFSHR_RXFV) ||
481 frame_hdr->len >= RX_BUF_SIZE ||
482 frame_hdr->len <= 0)) {
483
484 /* discard an invalid packet */
485 ks_wrreg16(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_RRXEF));
486 netdev->stats.rx_dropped++;
487 if (!(frame_hdr->sts & RXFSHR_RXFV))
488 netdev->stats.rx_frame_errors++;
489 else
490 netdev->stats.rx_length_errors++;
491 frame_hdr++;
492 continue;
493 }
494
495 skb = netdev_alloc_skb(netdev, frame_hdr->len + 16);
496 if (likely(skb)) {
497 skb_reserve(skb, 2);
498 /* read data block including CRC 4 bytes */
499 ks_read_qmu(ks, (u16 *)skb->data, frame_hdr->len);
500 skb_put(skb, frame_hdr->len - 4);
501 skb->protocol = eth_type_trans(skb, netdev);
502 netif_rx(skb);
503 /* exclude CRC size */
504 netdev->stats.rx_bytes += frame_hdr->len - 4;
505 netdev->stats.rx_packets++;
506 } else {
507 ks_wrreg16(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_RRXEF));
508 netdev->stats.rx_dropped++;
509 }
510 frame_hdr++;
511 }
512 }
513
514 /**
515 * ks_update_link_status - link status update.
516 * @netdev: The network device being opened.
517 * @ks: The chip information
518 *
519 */
520
ks_update_link_status(struct net_device * netdev,struct ks_net * ks)521 static void ks_update_link_status(struct net_device *netdev, struct ks_net *ks)
522 {
523 /* check the status of the link */
524 u32 link_up_status;
525 if (ks_rdreg16(ks, KS_P1SR) & P1SR_LINK_GOOD) {
526 netif_carrier_on(netdev);
527 link_up_status = true;
528 } else {
529 netif_carrier_off(netdev);
530 link_up_status = false;
531 }
532 netif_dbg(ks, link, ks->netdev,
533 "%s: %s\n", __func__, link_up_status ? "UP" : "DOWN");
534 }
535
536 /**
537 * ks_irq - device interrupt handler
538 * @irq: Interrupt number passed from the IRQ handler.
539 * @pw: The private word passed to register_irq(), our struct ks_net.
540 *
541 * This is the handler invoked to find out what happened
542 *
543 * Read the interrupt status, work out what needs to be done and then clear
544 * any of the interrupts that are not needed.
545 */
546
ks_irq(int irq,void * pw)547 static irqreturn_t ks_irq(int irq, void *pw)
548 {
549 struct net_device *netdev = pw;
550 struct ks_net *ks = netdev_priv(netdev);
551 u16 status;
552
553 /*this should be the first in IRQ handler */
554 ks_save_cmd_reg(ks);
555
556 status = ks_rdreg16(ks, KS_ISR);
557 if (unlikely(!status)) {
558 ks_restore_cmd_reg(ks);
559 return IRQ_NONE;
560 }
561
562 ks_wrreg16(ks, KS_ISR, status);
563
564 if (likely(status & IRQ_RXI))
565 ks_rcv(ks, netdev);
566
567 if (unlikely(status & IRQ_LCI))
568 ks_update_link_status(netdev, ks);
569
570 if (unlikely(status & IRQ_TXI))
571 netif_wake_queue(netdev);
572
573 if (unlikely(status & IRQ_LDI)) {
574
575 u16 pmecr = ks_rdreg16(ks, KS_PMECR);
576 pmecr &= ~PMECR_WKEVT_MASK;
577 ks_wrreg16(ks, KS_PMECR, pmecr | PMECR_WKEVT_LINK);
578 }
579
580 if (unlikely(status & IRQ_RXOI))
581 ks->netdev->stats.rx_over_errors++;
582 /* this should be the last in IRQ handler*/
583 ks_restore_cmd_reg(ks);
584 return IRQ_HANDLED;
585 }
586
587
588 /**
589 * ks_net_open - open network device
590 * @netdev: The network device being opened.
591 *
592 * Called when the network device is marked active, such as a user executing
593 * 'ifconfig up' on the device.
594 */
ks_net_open(struct net_device * netdev)595 static int ks_net_open(struct net_device *netdev)
596 {
597 struct ks_net *ks = netdev_priv(netdev);
598 int err;
599
600 #define KS_INT_FLAGS IRQF_TRIGGER_LOW
601 /* lock the card, even if we may not actually do anything
602 * else at the moment.
603 */
604
605 netif_dbg(ks, ifup, ks->netdev, "%s - entry\n", __func__);
606
607 /* reset the HW */
608 err = request_irq(netdev->irq, ks_irq, KS_INT_FLAGS, DRV_NAME, netdev);
609
610 if (err) {
611 pr_err("Failed to request IRQ: %d: %d\n", netdev->irq, err);
612 return err;
613 }
614
615 /* wake up powermode to normal mode */
616 ks_set_powermode(ks, PMECR_PM_NORMAL);
617 mdelay(1); /* wait for normal mode to take effect */
618
619 ks_wrreg16(ks, KS_ISR, 0xffff);
620 ks_enable_int(ks);
621 ks_enable_qmu(ks);
622 netif_start_queue(ks->netdev);
623
624 netif_dbg(ks, ifup, ks->netdev, "network device up\n");
625
626 return 0;
627 }
628
629 /**
630 * ks_net_stop - close network device
631 * @netdev: The device being closed.
632 *
633 * Called to close down a network device which has been active. Cancell any
634 * work, shutdown the RX and TX process and then place the chip into a low
635 * power state whilst it is not being used.
636 */
ks_net_stop(struct net_device * netdev)637 static int ks_net_stop(struct net_device *netdev)
638 {
639 struct ks_net *ks = netdev_priv(netdev);
640
641 netif_info(ks, ifdown, netdev, "shutting down\n");
642
643 netif_stop_queue(netdev);
644
645 mutex_lock(&ks->lock);
646
647 /* turn off the IRQs and ack any outstanding */
648 ks_wrreg16(ks, KS_IER, 0x0000);
649 ks_wrreg16(ks, KS_ISR, 0xffff);
650
651 /* shutdown RX/TX QMU */
652 ks_disable_qmu(ks);
653
654 /* set powermode to soft power down to save power */
655 ks_set_powermode(ks, PMECR_PM_SOFTDOWN);
656 free_irq(netdev->irq, netdev);
657 mutex_unlock(&ks->lock);
658 return 0;
659 }
660
661
662 /**
663 * ks_write_qmu - write 1 pkt data to the QMU.
664 * @ks: The chip information
665 * @pdata: buffer address to save 1 pkt
666 * @len: Pkt length in byte
667 * Here is the sequence to write 1 pkt:
668 * 1. set sudo DMA mode
669 * 2. write status/length
670 * 3. write pkt data
671 * 4. reset sudo DMA Mode
672 * 5. reset sudo DMA mode
673 * 6. Wait until pkt is out
674 */
ks_write_qmu(struct ks_net * ks,u8 * pdata,u16 len)675 static void ks_write_qmu(struct ks_net *ks, u8 *pdata, u16 len)
676 {
677 /* start header at txb[0] to align txw entries */
678 ks->txh.txw[0] = 0;
679 ks->txh.txw[1] = cpu_to_le16(len);
680
681 /* 1. set sudo-DMA mode */
682 ks_wrreg8(ks, KS_RXQCR, (ks->rc_rxqcr | RXQCR_SDA) & 0xff);
683 /* 2. write status/lenth info */
684 ks_outblk(ks, ks->txh.txw, 4);
685 /* 3. write pkt data */
686 ks_outblk(ks, (u16 *)pdata, ALIGN(len, 4));
687 /* 4. reset sudo-DMA mode */
688 ks_wrreg8(ks, KS_RXQCR, ks->rc_rxqcr);
689 /* 5. Enqueue Tx(move the pkt from TX buffer into TXQ) */
690 ks_wrreg16(ks, KS_TXQCR, TXQCR_METFE);
691 /* 6. wait until TXQCR_METFE is auto-cleared */
692 while (ks_rdreg16(ks, KS_TXQCR) & TXQCR_METFE)
693 ;
694 }
695
696 /**
697 * ks_start_xmit - transmit packet
698 * @skb : The buffer to transmit
699 * @netdev : The device used to transmit the packet.
700 *
701 * Called by the network layer to transmit the @skb.
702 * spin_lock_irqsave is required because tx and rx should be mutual exclusive.
703 * So while tx is in-progress, prevent IRQ interrupt from happenning.
704 */
ks_start_xmit(struct sk_buff * skb,struct net_device * netdev)705 static netdev_tx_t ks_start_xmit(struct sk_buff *skb, struct net_device *netdev)
706 {
707 netdev_tx_t retv = NETDEV_TX_OK;
708 struct ks_net *ks = netdev_priv(netdev);
709
710 disable_irq(netdev->irq);
711 ks_disable_int(ks);
712 spin_lock(&ks->statelock);
713
714 /* Extra space are required:
715 * 4 byte for alignment, 4 for status/length, 4 for CRC
716 */
717
718 if (likely(ks_tx_fifo_space(ks) >= skb->len + 12)) {
719 ks_write_qmu(ks, skb->data, skb->len);
720 /* add tx statistics */
721 netdev->stats.tx_bytes += skb->len;
722 netdev->stats.tx_packets++;
723 dev_kfree_skb(skb);
724 } else
725 retv = NETDEV_TX_BUSY;
726 spin_unlock(&ks->statelock);
727 ks_enable_int(ks);
728 enable_irq(netdev->irq);
729 return retv;
730 }
731
732 /**
733 * ks_start_rx - ready to serve pkts
734 * @ks : The chip information
735 *
736 */
ks_start_rx(struct ks_net * ks)737 static void ks_start_rx(struct ks_net *ks)
738 {
739 u16 cntl;
740
741 /* Enables QMU Receive (RXCR1). */
742 cntl = ks_rdreg16(ks, KS_RXCR1);
743 cntl |= RXCR1_RXE ;
744 ks_wrreg16(ks, KS_RXCR1, cntl);
745 } /* ks_start_rx */
746
747 /**
748 * ks_stop_rx - stop to serve pkts
749 * @ks : The chip information
750 *
751 */
ks_stop_rx(struct ks_net * ks)752 static void ks_stop_rx(struct ks_net *ks)
753 {
754 u16 cntl;
755
756 /* Disables QMU Receive (RXCR1). */
757 cntl = ks_rdreg16(ks, KS_RXCR1);
758 cntl &= ~RXCR1_RXE ;
759 ks_wrreg16(ks, KS_RXCR1, cntl);
760
761 } /* ks_stop_rx */
762
763 static unsigned long const ethernet_polynomial = CRC32_POLY_BE;
764
ether_gen_crc(int length,u8 * data)765 static unsigned long ether_gen_crc(int length, u8 *data)
766 {
767 long crc = -1;
768 while (--length >= 0) {
769 u8 current_octet = *data++;
770 int bit;
771
772 for (bit = 0; bit < 8; bit++, current_octet >>= 1) {
773 crc = (crc << 1) ^
774 ((crc < 0) ^ (current_octet & 1) ?
775 ethernet_polynomial : 0);
776 }
777 }
778 return (unsigned long)crc;
779 } /* ether_gen_crc */
780
781 /**
782 * ks_set_grpaddr - set multicast information
783 * @ks : The chip information
784 */
785
ks_set_grpaddr(struct ks_net * ks)786 static void ks_set_grpaddr(struct ks_net *ks)
787 {
788 u8 i;
789 u32 index, position, value;
790
791 memset(ks->mcast_bits, 0, sizeof(u8) * HW_MCAST_SIZE);
792
793 for (i = 0; i < ks->mcast_lst_size; i++) {
794 position = (ether_gen_crc(6, ks->mcast_lst[i]) >> 26) & 0x3f;
795 index = position >> 3;
796 value = 1 << (position & 7);
797 ks->mcast_bits[index] |= (u8)value;
798 }
799
800 for (i = 0; i < HW_MCAST_SIZE; i++) {
801 if (i & 1) {
802 ks_wrreg16(ks, (u16)((KS_MAHTR0 + i) & ~1),
803 (ks->mcast_bits[i] << 8) |
804 ks->mcast_bits[i - 1]);
805 }
806 }
807 } /* ks_set_grpaddr */
808
809 /**
810 * ks_clear_mcast - clear multicast information
811 *
812 * @ks : The chip information
813 * This routine removes all mcast addresses set in the hardware.
814 */
815
ks_clear_mcast(struct ks_net * ks)816 static void ks_clear_mcast(struct ks_net *ks)
817 {
818 u16 i, mcast_size;
819 for (i = 0; i < HW_MCAST_SIZE; i++)
820 ks->mcast_bits[i] = 0;
821
822 mcast_size = HW_MCAST_SIZE >> 2;
823 for (i = 0; i < mcast_size; i++)
824 ks_wrreg16(ks, KS_MAHTR0 + (2*i), 0);
825 }
826
ks_set_promis(struct ks_net * ks,u16 promiscuous_mode)827 static void ks_set_promis(struct ks_net *ks, u16 promiscuous_mode)
828 {
829 u16 cntl;
830 ks->promiscuous = promiscuous_mode;
831 ks_stop_rx(ks); /* Stop receiving for reconfiguration */
832 cntl = ks_rdreg16(ks, KS_RXCR1);
833
834 cntl &= ~RXCR1_FILTER_MASK;
835 if (promiscuous_mode)
836 /* Enable Promiscuous mode */
837 cntl |= RXCR1_RXAE | RXCR1_RXINVF;
838 else
839 /* Disable Promiscuous mode (default normal mode) */
840 cntl |= RXCR1_RXPAFMA;
841
842 ks_wrreg16(ks, KS_RXCR1, cntl);
843
844 if (ks->enabled)
845 ks_start_rx(ks);
846
847 } /* ks_set_promis */
848
ks_set_mcast(struct ks_net * ks,u16 mcast)849 static void ks_set_mcast(struct ks_net *ks, u16 mcast)
850 {
851 u16 cntl;
852
853 ks->all_mcast = mcast;
854 ks_stop_rx(ks); /* Stop receiving for reconfiguration */
855 cntl = ks_rdreg16(ks, KS_RXCR1);
856 cntl &= ~RXCR1_FILTER_MASK;
857 if (mcast)
858 /* Enable "Perfect with Multicast address passed mode" */
859 cntl |= (RXCR1_RXAE | RXCR1_RXMAFMA | RXCR1_RXPAFMA);
860 else
861 /**
862 * Disable "Perfect with Multicast address passed
863 * mode" (normal mode).
864 */
865 cntl |= RXCR1_RXPAFMA;
866
867 ks_wrreg16(ks, KS_RXCR1, cntl);
868
869 if (ks->enabled)
870 ks_start_rx(ks);
871 } /* ks_set_mcast */
872
ks_set_rx_mode(struct net_device * netdev)873 static void ks_set_rx_mode(struct net_device *netdev)
874 {
875 struct ks_net *ks = netdev_priv(netdev);
876 struct netdev_hw_addr *ha;
877
878 /* Turn on/off promiscuous mode. */
879 if ((netdev->flags & IFF_PROMISC) == IFF_PROMISC)
880 ks_set_promis(ks,
881 (u16)((netdev->flags & IFF_PROMISC) == IFF_PROMISC));
882 /* Turn on/off all mcast mode. */
883 else if ((netdev->flags & IFF_ALLMULTI) == IFF_ALLMULTI)
884 ks_set_mcast(ks,
885 (u16)((netdev->flags & IFF_ALLMULTI) == IFF_ALLMULTI));
886 else
887 ks_set_promis(ks, false);
888
889 if ((netdev->flags & IFF_MULTICAST) && netdev_mc_count(netdev)) {
890 if (netdev_mc_count(netdev) <= MAX_MCAST_LST) {
891 int i = 0;
892
893 netdev_for_each_mc_addr(ha, netdev) {
894 if (i >= MAX_MCAST_LST)
895 break;
896 memcpy(ks->mcast_lst[i++], ha->addr, ETH_ALEN);
897 }
898 ks->mcast_lst_size = (u8)i;
899 ks_set_grpaddr(ks);
900 } else {
901 /**
902 * List too big to support so
903 * turn on all mcast mode.
904 */
905 ks->mcast_lst_size = MAX_MCAST_LST;
906 ks_set_mcast(ks, true);
907 }
908 } else {
909 ks->mcast_lst_size = 0;
910 ks_clear_mcast(ks);
911 }
912 } /* ks_set_rx_mode */
913
ks_set_mac(struct ks_net * ks,u8 * data)914 static void ks_set_mac(struct ks_net *ks, u8 *data)
915 {
916 u16 *pw = (u16 *)data;
917 u16 w, u;
918
919 ks_stop_rx(ks); /* Stop receiving for reconfiguration */
920
921 u = *pw++;
922 w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
923 ks_wrreg16(ks, KS_MARH, w);
924
925 u = *pw++;
926 w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
927 ks_wrreg16(ks, KS_MARM, w);
928
929 u = *pw;
930 w = ((u & 0xFF) << 8) | ((u >> 8) & 0xFF);
931 ks_wrreg16(ks, KS_MARL, w);
932
933 memcpy(ks->mac_addr, data, ETH_ALEN);
934
935 if (ks->enabled)
936 ks_start_rx(ks);
937 }
938
ks_set_mac_address(struct net_device * netdev,void * paddr)939 static int ks_set_mac_address(struct net_device *netdev, void *paddr)
940 {
941 struct ks_net *ks = netdev_priv(netdev);
942 struct sockaddr *addr = paddr;
943 u8 *da;
944
945 memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);
946
947 da = (u8 *)netdev->dev_addr;
948
949 ks_set_mac(ks, da);
950 return 0;
951 }
952
ks_net_ioctl(struct net_device * netdev,struct ifreq * req,int cmd)953 static int ks_net_ioctl(struct net_device *netdev, struct ifreq *req, int cmd)
954 {
955 struct ks_net *ks = netdev_priv(netdev);
956
957 if (!netif_running(netdev))
958 return -EINVAL;
959
960 return generic_mii_ioctl(&ks->mii, if_mii(req), cmd, NULL);
961 }
962
963 static const struct net_device_ops ks_netdev_ops = {
964 .ndo_open = ks_net_open,
965 .ndo_stop = ks_net_stop,
966 .ndo_do_ioctl = ks_net_ioctl,
967 .ndo_start_xmit = ks_start_xmit,
968 .ndo_set_mac_address = ks_set_mac_address,
969 .ndo_set_rx_mode = ks_set_rx_mode,
970 .ndo_validate_addr = eth_validate_addr,
971 };
972
973 /* ethtool support */
974
ks_get_drvinfo(struct net_device * netdev,struct ethtool_drvinfo * di)975 static void ks_get_drvinfo(struct net_device *netdev,
976 struct ethtool_drvinfo *di)
977 {
978 strlcpy(di->driver, DRV_NAME, sizeof(di->driver));
979 strlcpy(di->version, "1.00", sizeof(di->version));
980 strlcpy(di->bus_info, dev_name(netdev->dev.parent),
981 sizeof(di->bus_info));
982 }
983
ks_get_msglevel(struct net_device * netdev)984 static u32 ks_get_msglevel(struct net_device *netdev)
985 {
986 struct ks_net *ks = netdev_priv(netdev);
987 return ks->msg_enable;
988 }
989
ks_set_msglevel(struct net_device * netdev,u32 to)990 static void ks_set_msglevel(struct net_device *netdev, u32 to)
991 {
992 struct ks_net *ks = netdev_priv(netdev);
993 ks->msg_enable = to;
994 }
995
ks_get_link_ksettings(struct net_device * netdev,struct ethtool_link_ksettings * cmd)996 static int ks_get_link_ksettings(struct net_device *netdev,
997 struct ethtool_link_ksettings *cmd)
998 {
999 struct ks_net *ks = netdev_priv(netdev);
1000
1001 mii_ethtool_get_link_ksettings(&ks->mii, cmd);
1002
1003 return 0;
1004 }
1005
ks_set_link_ksettings(struct net_device * netdev,const struct ethtool_link_ksettings * cmd)1006 static int ks_set_link_ksettings(struct net_device *netdev,
1007 const struct ethtool_link_ksettings *cmd)
1008 {
1009 struct ks_net *ks = netdev_priv(netdev);
1010 return mii_ethtool_set_link_ksettings(&ks->mii, cmd);
1011 }
1012
ks_get_link(struct net_device * netdev)1013 static u32 ks_get_link(struct net_device *netdev)
1014 {
1015 struct ks_net *ks = netdev_priv(netdev);
1016 return mii_link_ok(&ks->mii);
1017 }
1018
ks_nway_reset(struct net_device * netdev)1019 static int ks_nway_reset(struct net_device *netdev)
1020 {
1021 struct ks_net *ks = netdev_priv(netdev);
1022 return mii_nway_restart(&ks->mii);
1023 }
1024
1025 static const struct ethtool_ops ks_ethtool_ops = {
1026 .get_drvinfo = ks_get_drvinfo,
1027 .get_msglevel = ks_get_msglevel,
1028 .set_msglevel = ks_set_msglevel,
1029 .get_link = ks_get_link,
1030 .nway_reset = ks_nway_reset,
1031 .get_link_ksettings = ks_get_link_ksettings,
1032 .set_link_ksettings = ks_set_link_ksettings,
1033 };
1034
1035 /* MII interface controls */
1036
1037 /**
1038 * ks_phy_reg - convert MII register into a KS8851 register
1039 * @reg: MII register number.
1040 *
1041 * Return the KS8851 register number for the corresponding MII PHY register
1042 * if possible. Return zero if the MII register has no direct mapping to the
1043 * KS8851 register set.
1044 */
ks_phy_reg(int reg)1045 static int ks_phy_reg(int reg)
1046 {
1047 switch (reg) {
1048 case MII_BMCR:
1049 return KS_P1MBCR;
1050 case MII_BMSR:
1051 return KS_P1MBSR;
1052 case MII_PHYSID1:
1053 return KS_PHY1ILR;
1054 case MII_PHYSID2:
1055 return KS_PHY1IHR;
1056 case MII_ADVERTISE:
1057 return KS_P1ANAR;
1058 case MII_LPA:
1059 return KS_P1ANLPR;
1060 }
1061
1062 return 0x0;
1063 }
1064
1065 /**
1066 * ks_phy_read - MII interface PHY register read.
1067 * @netdev: The network device the PHY is on.
1068 * @phy_addr: Address of PHY (ignored as we only have one)
1069 * @reg: The register to read.
1070 *
1071 * This call reads data from the PHY register specified in @reg. Since the
1072 * device does not support all the MII registers, the non-existent values
1073 * are always returned as zero.
1074 *
1075 * We return zero for unsupported registers as the MII code does not check
1076 * the value returned for any error status, and simply returns it to the
1077 * caller. The mii-tool that the driver was tested with takes any -ve error
1078 * as real PHY capabilities, thus displaying incorrect data to the user.
1079 */
ks_phy_read(struct net_device * netdev,int phy_addr,int reg)1080 static int ks_phy_read(struct net_device *netdev, int phy_addr, int reg)
1081 {
1082 struct ks_net *ks = netdev_priv(netdev);
1083 int ksreg;
1084 int result;
1085
1086 ksreg = ks_phy_reg(reg);
1087 if (!ksreg)
1088 return 0x0; /* no error return allowed, so use zero */
1089
1090 mutex_lock(&ks->lock);
1091 result = ks_rdreg16(ks, ksreg);
1092 mutex_unlock(&ks->lock);
1093
1094 return result;
1095 }
1096
ks_phy_write(struct net_device * netdev,int phy,int reg,int value)1097 static void ks_phy_write(struct net_device *netdev,
1098 int phy, int reg, int value)
1099 {
1100 struct ks_net *ks = netdev_priv(netdev);
1101 int ksreg;
1102
1103 ksreg = ks_phy_reg(reg);
1104 if (ksreg) {
1105 mutex_lock(&ks->lock);
1106 ks_wrreg16(ks, ksreg, value);
1107 mutex_unlock(&ks->lock);
1108 }
1109 }
1110
1111 /**
1112 * ks_read_selftest - read the selftest memory info.
1113 * @ks: The device state
1114 *
1115 * Read and check the TX/RX memory selftest information.
1116 */
ks_read_selftest(struct ks_net * ks)1117 static int ks_read_selftest(struct ks_net *ks)
1118 {
1119 unsigned both_done = MBIR_TXMBF | MBIR_RXMBF;
1120 int ret = 0;
1121 unsigned rd;
1122
1123 rd = ks_rdreg16(ks, KS_MBIR);
1124
1125 if ((rd & both_done) != both_done) {
1126 netdev_warn(ks->netdev, "Memory selftest not finished\n");
1127 return 0;
1128 }
1129
1130 if (rd & MBIR_TXMBFA) {
1131 netdev_err(ks->netdev, "TX memory selftest fails\n");
1132 ret |= 1;
1133 }
1134
1135 if (rd & MBIR_RXMBFA) {
1136 netdev_err(ks->netdev, "RX memory selftest fails\n");
1137 ret |= 2;
1138 }
1139
1140 netdev_info(ks->netdev, "the selftest passes\n");
1141 return ret;
1142 }
1143
ks_setup(struct ks_net * ks)1144 static void ks_setup(struct ks_net *ks)
1145 {
1146 u16 w;
1147
1148 /**
1149 * Configure QMU Transmit
1150 */
1151
1152 /* Setup Transmit Frame Data Pointer Auto-Increment (TXFDPR) */
1153 ks_wrreg16(ks, KS_TXFDPR, TXFDPR_TXFPAI);
1154
1155 /* Setup Receive Frame Data Pointer Auto-Increment */
1156 ks_wrreg16(ks, KS_RXFDPR, RXFDPR_RXFPAI);
1157
1158 /* Setup Receive Frame Threshold - 1 frame (RXFCTFC) */
1159 ks_wrreg16(ks, KS_RXFCTR, 1 & RXFCTR_RXFCT_MASK);
1160
1161 /* Setup RxQ Command Control (RXQCR) */
1162 ks->rc_rxqcr = RXQCR_CMD_CNTL;
1163 ks_wrreg16(ks, KS_RXQCR, ks->rc_rxqcr);
1164
1165 /**
1166 * set the force mode to half duplex, default is full duplex
1167 * because if the auto-negotiation fails, most switch uses
1168 * half-duplex.
1169 */
1170
1171 w = ks_rdreg16(ks, KS_P1MBCR);
1172 w &= ~BMCR_FULLDPLX;
1173 ks_wrreg16(ks, KS_P1MBCR, w);
1174
1175 w = TXCR_TXFCE | TXCR_TXPE | TXCR_TXCRC | TXCR_TCGIP;
1176 ks_wrreg16(ks, KS_TXCR, w);
1177
1178 w = RXCR1_RXFCE | RXCR1_RXBE | RXCR1_RXUE | RXCR1_RXME | RXCR1_RXIPFCC;
1179
1180 if (ks->promiscuous) /* bPromiscuous */
1181 w |= (RXCR1_RXAE | RXCR1_RXINVF);
1182 else if (ks->all_mcast) /* Multicast address passed mode */
1183 w |= (RXCR1_RXAE | RXCR1_RXMAFMA | RXCR1_RXPAFMA);
1184 else /* Normal mode */
1185 w |= RXCR1_RXPAFMA;
1186
1187 ks_wrreg16(ks, KS_RXCR1, w);
1188 } /*ks_setup */
1189
1190
ks_setup_int(struct ks_net * ks)1191 static void ks_setup_int(struct ks_net *ks)
1192 {
1193 ks->rc_ier = 0x00;
1194 /* Clear the interrupts status of the hardware. */
1195 ks_wrreg16(ks, KS_ISR, 0xffff);
1196
1197 /* Enables the interrupts of the hardware. */
1198 ks->rc_ier = (IRQ_LCI | IRQ_TXI | IRQ_RXI);
1199 } /* ks_setup_int */
1200
ks_hw_init(struct ks_net * ks)1201 static int ks_hw_init(struct ks_net *ks)
1202 {
1203 #define MHEADER_SIZE (sizeof(struct type_frame_head) * MAX_RECV_FRAMES)
1204 ks->promiscuous = 0;
1205 ks->all_mcast = 0;
1206 ks->mcast_lst_size = 0;
1207
1208 ks->frame_head_info = devm_kmalloc(&ks->pdev->dev, MHEADER_SIZE,
1209 GFP_KERNEL);
1210 if (!ks->frame_head_info)
1211 return false;
1212
1213 ks_set_mac(ks, KS_DEFAULT_MAC_ADDRESS);
1214 return true;
1215 }
1216
1217 #if defined(CONFIG_OF)
1218 static const struct of_device_id ks8851_ml_dt_ids[] = {
1219 { .compatible = "micrel,ks8851-mll" },
1220 { /* sentinel */ }
1221 };
1222 MODULE_DEVICE_TABLE(of, ks8851_ml_dt_ids);
1223 #endif
1224
ks8851_probe(struct platform_device * pdev)1225 static int ks8851_probe(struct platform_device *pdev)
1226 {
1227 int err;
1228 struct net_device *netdev;
1229 struct ks_net *ks;
1230 u16 id, data;
1231 const char *mac;
1232
1233 netdev = alloc_etherdev(sizeof(struct ks_net));
1234 if (!netdev)
1235 return -ENOMEM;
1236
1237 SET_NETDEV_DEV(netdev, &pdev->dev);
1238
1239 ks = netdev_priv(netdev);
1240 ks->netdev = netdev;
1241
1242 ks->hw_addr = devm_platform_ioremap_resource(pdev, 0);
1243 if (IS_ERR(ks->hw_addr)) {
1244 err = PTR_ERR(ks->hw_addr);
1245 goto err_free;
1246 }
1247
1248 ks->hw_addr_cmd = devm_platform_ioremap_resource(pdev, 1);
1249 if (IS_ERR(ks->hw_addr_cmd)) {
1250 err = PTR_ERR(ks->hw_addr_cmd);
1251 goto err_free;
1252 }
1253
1254 netdev->irq = platform_get_irq(pdev, 0);
1255
1256 if ((int)netdev->irq < 0) {
1257 err = netdev->irq;
1258 goto err_free;
1259 }
1260
1261 ks->pdev = pdev;
1262
1263 mutex_init(&ks->lock);
1264 spin_lock_init(&ks->statelock);
1265
1266 netdev->netdev_ops = &ks_netdev_ops;
1267 netdev->ethtool_ops = &ks_ethtool_ops;
1268
1269 /* setup mii state */
1270 ks->mii.dev = netdev;
1271 ks->mii.phy_id = 1,
1272 ks->mii.phy_id_mask = 1;
1273 ks->mii.reg_num_mask = 0xf;
1274 ks->mii.mdio_read = ks_phy_read;
1275 ks->mii.mdio_write = ks_phy_write;
1276
1277 netdev_info(netdev, "message enable is %d\n", msg_enable);
1278 /* set the default message enable */
1279 ks->msg_enable = netif_msg_init(msg_enable, (NETIF_MSG_DRV |
1280 NETIF_MSG_PROBE |
1281 NETIF_MSG_LINK));
1282 ks_read_config(ks);
1283
1284 /* simple check for a valid chip being connected to the bus */
1285 if ((ks_rdreg16(ks, KS_CIDER) & ~CIDER_REV_MASK) != CIDER_ID) {
1286 netdev_err(netdev, "failed to read device ID\n");
1287 err = -ENODEV;
1288 goto err_free;
1289 }
1290
1291 if (ks_read_selftest(ks)) {
1292 netdev_err(netdev, "failed to read device ID\n");
1293 err = -ENODEV;
1294 goto err_free;
1295 }
1296
1297 err = register_netdev(netdev);
1298 if (err)
1299 goto err_free;
1300
1301 platform_set_drvdata(pdev, netdev);
1302
1303 ks_soft_reset(ks, GRR_GSR);
1304 ks_hw_init(ks);
1305 ks_disable_qmu(ks);
1306 ks_setup(ks);
1307 ks_setup_int(ks);
1308
1309 data = ks_rdreg16(ks, KS_OBCR);
1310 ks_wrreg16(ks, KS_OBCR, data | OBCR_ODS_16mA);
1311
1312 /* overwriting the default MAC address */
1313 if (pdev->dev.of_node) {
1314 mac = of_get_mac_address(pdev->dev.of_node);
1315 if (!IS_ERR(mac))
1316 ether_addr_copy(ks->mac_addr, mac);
1317 } else {
1318 struct ks8851_mll_platform_data *pdata;
1319
1320 pdata = dev_get_platdata(&pdev->dev);
1321 if (!pdata) {
1322 netdev_err(netdev, "No platform data\n");
1323 err = -ENODEV;
1324 goto err_pdata;
1325 }
1326 memcpy(ks->mac_addr, pdata->mac_addr, ETH_ALEN);
1327 }
1328 if (!is_valid_ether_addr(ks->mac_addr)) {
1329 /* Use random MAC address if none passed */
1330 eth_random_addr(ks->mac_addr);
1331 netdev_info(netdev, "Using random mac address\n");
1332 }
1333 netdev_info(netdev, "Mac address is: %pM\n", ks->mac_addr);
1334
1335 memcpy(netdev->dev_addr, ks->mac_addr, ETH_ALEN);
1336
1337 ks_set_mac(ks, netdev->dev_addr);
1338
1339 id = ks_rdreg16(ks, KS_CIDER);
1340
1341 netdev_info(netdev, "Found chip, family: 0x%x, id: 0x%x, rev: 0x%x\n",
1342 (id >> 8) & 0xff, (id >> 4) & 0xf, (id >> 1) & 0x7);
1343 return 0;
1344
1345 err_pdata:
1346 unregister_netdev(netdev);
1347 err_free:
1348 free_netdev(netdev);
1349 return err;
1350 }
1351
ks8851_remove(struct platform_device * pdev)1352 static int ks8851_remove(struct platform_device *pdev)
1353 {
1354 struct net_device *netdev = platform_get_drvdata(pdev);
1355
1356 unregister_netdev(netdev);
1357 free_netdev(netdev);
1358 return 0;
1359
1360 }
1361
1362 static struct platform_driver ks8851_platform_driver = {
1363 .driver = {
1364 .name = DRV_NAME,
1365 .of_match_table = of_match_ptr(ks8851_ml_dt_ids),
1366 },
1367 .probe = ks8851_probe,
1368 .remove = ks8851_remove,
1369 };
1370
1371 module_platform_driver(ks8851_platform_driver);
1372
1373 MODULE_DESCRIPTION("KS8851 MLL Network driver");
1374 MODULE_AUTHOR("David Choi <david.choi@micrel.com>");
1375 MODULE_LICENSE("GPL");
1376 module_param_named(message, msg_enable, int, 0);
1377 MODULE_PARM_DESC(message, "Message verbosity level (0=none, 31=all)");
1378
1379