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MERGE-master-patchset-edits
[linux-2.6/openmoko-kernel.git] / drivers / net / wan / ixp4xx_hss.c
blob0dbd85b0162da72a9a577cd91358b90b5d52d07b
1 /*
2 * Intel IXP4xx HSS (synchronous serial port) driver for Linux
3 *
4 * Copyright (C) 2007-2008 Krzysztof Hałasa <khc@pm.waw.pl>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of version 2 of the GNU General Public License
8 * as published by the Free Software Foundation.
9 */
10
11 #include <linux/bitops.h>
12 #include <linux/cdev.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/dmapool.h>
15 #include <linux/fs.h>
16 #include <linux/hdlc.h>
17 #include <linux/io.h>
18 #include <linux/kernel.h>
19 #include <linux/platform_device.h>
20 #include <linux/poll.h>
21 #include <mach/npe.h>
22 #include <mach/qmgr.h>
23
24 #define DEBUG_DESC 0
25 #define DEBUG_RX 0
26 #define DEBUG_TX 0
27 #define DEBUG_PKT_BYTES 0
28 #define DEBUG_CLOSE 0
29
30 #define DRV_NAME "ixp4xx_hss"
31
32 #define PKT_EXTRA_FLAGS 0 /* orig 1 */
33 #define PKT_NUM_PIPES 1 /* 1, 2 or 4 */
34 #define PKT_PIPE_FIFO_SIZEW 4 /* total 4 dwords per HSS */
35
36 #define RX_DESCS 16 /* also length of all RX queues */
37 #define TX_DESCS 16 /* also length of all TX queues */
38
39 #define POOL_ALLOC_SIZE (sizeof(struct desc) * (RX_DESCS + TX_DESCS))
40 #define RX_SIZE (HDLC_MAX_MRU + 4) /* NPE needs more space */
41 #define MAX_CLOSE_WAIT 1000 /* microseconds */
42 #define HSS_COUNT 2
43 #define FRAME_SIZE 256 /* doesn't matter at this point */
44 #define FRAME_OFFSET 0
45 #define MAX_CHANNELS (FRAME_SIZE / 8)
46
47 #define NAPI_WEIGHT 16
48
49 /* Queue IDs */
50 #define HSS0_CHL_RXTRIG_QUEUE 12 /* orig size = 32 dwords */
51 #define HSS0_PKT_RX_QUEUE 13 /* orig size = 32 dwords */
52 #define HSS0_PKT_TX0_QUEUE 14 /* orig size = 16 dwords */
53 #define HSS0_PKT_TX1_QUEUE 15
54 #define HSS0_PKT_TX2_QUEUE 16
55 #define HSS0_PKT_TX3_QUEUE 17
56 #define HSS0_PKT_RXFREE0_QUEUE 18 /* orig size = 16 dwords */
57 #define HSS0_PKT_RXFREE1_QUEUE 19
58 #define HSS0_PKT_RXFREE2_QUEUE 20
59 #define HSS0_PKT_RXFREE3_QUEUE 21
60 #define HSS0_PKT_TXDONE_QUEUE 22 /* orig size = 64 dwords */
61
62 #define HSS1_CHL_RXTRIG_QUEUE 10
63 #define HSS1_PKT_RX_QUEUE 0
64 #define HSS1_PKT_TX0_QUEUE 5
65 #define HSS1_PKT_TX1_QUEUE 6
66 #define HSS1_PKT_TX2_QUEUE 7
67 #define HSS1_PKT_TX3_QUEUE 8
68 #define HSS1_PKT_RXFREE0_QUEUE 1
69 #define HSS1_PKT_RXFREE1_QUEUE 2
70 #define HSS1_PKT_RXFREE2_QUEUE 3
71 #define HSS1_PKT_RXFREE3_QUEUE 4
72 #define HSS1_PKT_TXDONE_QUEUE 9
73
74 #define NPE_PKT_MODE_HDLC 0
75 #define NPE_PKT_MODE_RAW 1
76 #define NPE_PKT_MODE_56KMODE 2
77 #define NPE_PKT_MODE_56KENDIAN_MSB 4
78
79 /* PKT_PIPE_HDLC_CFG_WRITE flags */
80 #define PKT_HDLC_IDLE_ONES 0x1 /* default = flags */
81 #define PKT_HDLC_CRC_32 0x2 /* default = CRC-16 */
82 #define PKT_HDLC_MSB_ENDIAN 0x4 /* default = LE */
83
84
85 /* hss_config, PCRs */
86 /* Frame sync sampling, default = active low */
87 #define PCR_FRM_SYNC_ACTIVE_HIGH 0x40000000
88 #define PCR_FRM_SYNC_FALLINGEDGE 0x80000000
89 #define PCR_FRM_SYNC_RISINGEDGE 0xC0000000
90
91 /* Frame sync pin: input (default) or output generated off a given clk edge */
92 #define PCR_FRM_SYNC_OUTPUT_FALLING 0x20000000
93 #define PCR_FRM_SYNC_OUTPUT_RISING 0x30000000
94
95 /* Frame and data clock sampling on edge, default = falling */
96 #define PCR_FCLK_EDGE_RISING 0x08000000
97 #define PCR_DCLK_EDGE_RISING 0x04000000
98
99 /* Clock direction, default = input */
100 #define PCR_SYNC_CLK_DIR_OUTPUT 0x02000000
101
102 /* Generate/Receive frame pulses, default = enabled */
103 #define PCR_FRM_PULSE_DISABLED 0x01000000
104
105 /* Data rate is full (default) or half the configured clk speed */
106 #define PCR_HALF_CLK_RATE 0x00200000
107
108 /* Invert data between NPE and HSS FIFOs? (default = no) */
109 #define PCR_DATA_POLARITY_INVERT 0x00100000
110
111 /* TX/RX endianness, default = LSB */
112 #define PCR_MSB_ENDIAN 0x00080000
113
114 /* Normal (default) / open drain mode (TX only) */
115 #define PCR_TX_PINS_OPEN_DRAIN 0x00040000
116
117 /* No framing bit transmitted and expected on RX? (default = framing bit) */
118 #define PCR_SOF_NO_FBIT 0x00020000
119
120 /* Drive data pins? */
121 #define PCR_TX_DATA_ENABLE 0x00010000
122
123 /* Voice 56k type: drive the data pins low (default), high, high Z */
124 #define PCR_TX_V56K_HIGH 0x00002000
125 #define PCR_TX_V56K_HIGH_IMP 0x00004000
126
127 /* Unassigned type: drive the data pins low (default), high, high Z */
128 #define PCR_TX_UNASS_HIGH 0x00000800
129 #define PCR_TX_UNASS_HIGH_IMP 0x00001000
130
131 /* T1 @ 1.544MHz only: Fbit dictated in FIFO (default) or high Z */
132 #define PCR_TX_FB_HIGH_IMP 0x00000400
133
134 /* 56k data endiannes - which bit unused: high (default) or low */
135 #define PCR_TX_56KE_BIT_0_UNUSED 0x00000200
136
137 /* 56k data transmission type: 32/8 bit data (default) or 56K data */
138 #define PCR_TX_56KS_56K_DATA 0x00000100
139
140 /* hss_config, cCR */
141 /* Number of packetized clients, default = 1 */
142 #define CCR_NPE_HFIFO_2_HDLC 0x04000000
143 #define CCR_NPE_HFIFO_3_OR_4HDLC 0x08000000
144
145 /* default = no loopback */
146 #define CCR_LOOPBACK 0x02000000
147
148 /* HSS number, default = 0 (first) */
149 #define CCR_SECOND_HSS 0x01000000
150
151
152 /* hss_config, clkCR: main:10, num:10, denom:12 */
153 #define CLK42X_SPEED_EXP ((0x3FF << 22) | ( 2 << 12) | 15) /*65 KHz*/
154
155 #define CLK42X_SPEED_512KHZ (( 130 << 22) | ( 2 << 12) | 15)
156 #define CLK42X_SPEED_1536KHZ (( 43 << 22) | ( 18 << 12) | 47)
157 #define CLK42X_SPEED_1544KHZ (( 43 << 22) | ( 33 << 12) | 192)
158 #define CLK42X_SPEED_2048KHZ (( 32 << 22) | ( 34 << 12) | 63)
159 #define CLK42X_SPEED_4096KHZ (( 16 << 22) | ( 34 << 12) | 127)
160 #define CLK42X_SPEED_8192KHZ (( 8 << 22) | ( 34 << 12) | 255)
161
162 #define CLK46X_SPEED_512KHZ (( 130 << 22) | ( 24 << 12) | 127)
163 #define CLK46X_SPEED_1536KHZ (( 43 << 22) | (152 << 12) | 383)
164 #define CLK46X_SPEED_1544KHZ (( 43 << 22) | ( 66 << 12) | 385)
165 #define CLK46X_SPEED_2048KHZ (( 32 << 22) | (280 << 12) | 511)
166 #define CLK46X_SPEED_4096KHZ (( 16 << 22) | (280 << 12) | 1023)
167 #define CLK46X_SPEED_8192KHZ (( 8 << 22) | (280 << 12) | 2047)
168
169
170 /* hss_config, LUT entries */
171 #define TDMMAP_UNASSIGNED 0
172 #define TDMMAP_HDLC 1 /* HDLC - packetized */
173 #define TDMMAP_VOICE56K 2 /* Voice56K - 7-bit channelized */
174 #define TDMMAP_VOICE64K 3 /* Voice64K - 8-bit channelized */
175
176 /* offsets into HSS config */
177 #define HSS_CONFIG_TX_PCR 0x00 /* port configuration registers */
178 #define HSS_CONFIG_RX_PCR 0x04
179 #define HSS_CONFIG_CORE_CR 0x08 /* loopback control, HSS# */
180 #define HSS_CONFIG_CLOCK_CR 0x0C /* clock generator control */
181 #define HSS_CONFIG_TX_FCR 0x10 /* frame configuration registers */
182 #define HSS_CONFIG_RX_FCR 0x14
183 #define HSS_CONFIG_TX_LUT 0x18 /* channel look-up tables */
184 #define HSS_CONFIG_RX_LUT 0x38
185
186
187 /* NPE command codes */
188 /* writes the ConfigWord value to the location specified by offset */
189 #define PORT_CONFIG_WRITE 0x40
190
191 /* triggers the NPE to load the contents of the configuration table */
192 #define PORT_CONFIG_LOAD 0x41
193
194 /* triggers the NPE to return an HssErrorReadResponse message */
195 #define PORT_ERROR_READ 0x42
196
197 /* triggers the NPE to reset internal status and enable the HssPacketized
198 operation for the flow specified by pPipe */
199 #define PKT_PIPE_FLOW_ENABLE 0x50
200 #define PKT_PIPE_FLOW_DISABLE 0x51
201 #define PKT_NUM_PIPES_WRITE 0x52
202 #define PKT_PIPE_FIFO_SIZEW_WRITE 0x53
203 #define PKT_PIPE_HDLC_CFG_WRITE 0x54
204 #define PKT_PIPE_IDLE_PATTERN_WRITE 0x55
205 #define PKT_PIPE_RX_SIZE_WRITE 0x56
206 #define PKT_PIPE_MODE_WRITE 0x57
207
208 /* HDLC packet status values - desc->status */
209 #define ERR_SHUTDOWN 1 /* stop or shutdown occurrance */
210 #define ERR_HDLC_ALIGN 2 /* HDLC alignment error */
211 #define ERR_HDLC_FCS 3 /* HDLC Frame Check Sum error */
212 #define ERR_RXFREE_Q_EMPTY 4 /* RX-free queue became empty while receiving
213 this packet (if buf_len < pkt_len) */
214 #define ERR_HDLC_TOO_LONG 5 /* HDLC frame size too long */
215 #define ERR_HDLC_ABORT 6 /* abort sequence received */
216 #define ERR_DISCONNECTING 7 /* disconnect is in progress */
217
218
219 #ifdef __ARMEB__
220 typedef struct sk_buff buffer_t;
221 #define free_buffer dev_kfree_skb
222 #define free_buffer_irq dev_kfree_skb_irq
223 #else
224 typedef void buffer_t;
225 #define free_buffer kfree
226 #define free_buffer_irq kfree
227 #endif
228
229 struct port {
230 struct device *dev;
231 struct npe *npe;
232 struct net_device *netdev;
233 struct napi_struct napi;
234 struct hss_plat_info *plat;
235 buffer_t *rx_buff_tab[RX_DESCS], *tx_buff_tab[TX_DESCS];
236 struct desc *desc_tab; /* coherent */
237 u32 desc_tab_phys;
238 unsigned int id;
239 unsigned int clock_type, clock_rate, loopback;
240 unsigned int initialized, carrier;
241 u8 hdlc_cfg;
242 };
243
244 /* NPE message structure */
245 struct msg {
246 #ifdef __ARMEB__
247 u8 cmd, unused, hss_port, index;
248 union {
249 struct { u8 data8a, data8b, data8c, data8d; };
250 struct { u16 data16a, data16b; };
251 struct { u32 data32; };
252 };
253 #else
254 u8 index, hss_port, unused, cmd;
255 union {
256 struct { u8 data8d, data8c, data8b, data8a; };
257 struct { u16 data16b, data16a; };
258 struct { u32 data32; };
259 };
260 #endif
261 };
262
263 /* HDLC packet descriptor */
264 struct desc {
265 u32 next; /* pointer to next buffer, unused */
266
267 #ifdef __ARMEB__
268 u16 buf_len; /* buffer length */
269 u16 pkt_len; /* packet length */
270 u32 data; /* pointer to data buffer in RAM */
271 u8 status;
272 u8 error_count;
273 u16 __reserved;
274 #else
275 u16 pkt_len; /* packet length */
276 u16 buf_len; /* buffer length */
277 u32 data; /* pointer to data buffer in RAM */
278 u16 __reserved;
279 u8 error_count;
280 u8 status;
281 #endif
282 u32 __reserved1[4];
283 };
284
285
286 #define rx_desc_phys(port, n) ((port)->desc_tab_phys + \
287 (n) * sizeof(struct desc))
288 #define rx_desc_ptr(port, n) (&(port)->desc_tab[n])
289
290 #define tx_desc_phys(port, n) ((port)->desc_tab_phys + \
291 ((n) + RX_DESCS) * sizeof(struct desc))
292 #define tx_desc_ptr(port, n) (&(port)->desc_tab[(n) + RX_DESCS])
293
294 /*****************************************************************************
295 * global variables
296 ****************************************************************************/
297
298 static int ports_open;
299 static struct dma_pool *dma_pool;
300 static spinlock_t npe_lock;
301
302 static const struct {
303 int tx, txdone, rx, rxfree;
304 }queue_ids[2] = {{HSS0_PKT_TX0_QUEUE, HSS0_PKT_TXDONE_QUEUE, HSS0_PKT_RX_QUEUE,
305 HSS0_PKT_RXFREE0_QUEUE},
306 {HSS1_PKT_TX0_QUEUE, HSS1_PKT_TXDONE_QUEUE, HSS1_PKT_RX_QUEUE,
307 HSS1_PKT_RXFREE0_QUEUE},
308 };
309
310 /*****************************************************************************
311 * utility functions
312 ****************************************************************************/
313
314 static inline struct port* dev_to_port(struct net_device *dev)
315 {
316 return dev_to_hdlc(dev)->priv;
317 }
318
319 #ifndef __ARMEB__
320 static inline void memcpy_swab32(u32 *dest, u32 *src, int cnt)
321 {
322 int i;
323 for (i = 0; i < cnt; i++)
324 dest[i] = swab32(src[i]);
325 }
326 #endif
327
328 /*****************************************************************************
329 * HSS access
330 ****************************************************************************/
331
332 static void hss_npe_send(struct port *port, struct msg *msg, const char* what)
333 {
334 u32 *val = (u32*)msg;
335 if (npe_send_message(port->npe, msg, what)) {
336 printk(KERN_CRIT "HSS-%i: unable to send command [%08X:%08X]"
337 " to %s\n", port->id, val[0], val[1],
338 npe_name(port->npe));
339 BUG();
340 }
341 }
342
343 static void hss_config_set_lut(struct port *port)
344 {
345 struct msg msg;
346 int ch;
347
348 memset(&msg, 0, sizeof(msg));
349 msg.cmd = PORT_CONFIG_WRITE;
350 msg.hss_port = port->id;
351
352 for (ch = 0; ch < MAX_CHANNELS; ch++) {
353 msg.data32 >>= 2;
354 msg.data32 |= TDMMAP_HDLC << 30;
355
356 if (ch % 16 == 15) {
357 msg.index = HSS_CONFIG_TX_LUT + ((ch / 4) & ~3);
358 hss_npe_send(port, &msg, "HSS_SET_TX_LUT");
359
360 msg.index += HSS_CONFIG_RX_LUT - HSS_CONFIG_TX_LUT;
361 hss_npe_send(port, &msg, "HSS_SET_RX_LUT");
362 }
363 }
364 }
365
366 static void hss_config(struct port *port)
367 {
368 struct msg msg;
369
370 memset(&msg, 0, sizeof(msg));
371 msg.cmd = PORT_CONFIG_WRITE;
372 msg.hss_port = port->id;
373 msg.index = HSS_CONFIG_TX_PCR;
374 msg.data32 = PCR_FRM_SYNC_OUTPUT_RISING | PCR_MSB_ENDIAN |
375 PCR_TX_DATA_ENABLE | PCR_SOF_NO_FBIT;
376 if (port->clock_type == CLOCK_INT)
377 msg.data32 |= PCR_SYNC_CLK_DIR_OUTPUT;
378 hss_npe_send(port, &msg, "HSS_SET_TX_PCR");
379
380 msg.index = HSS_CONFIG_RX_PCR;
381 msg.data32 ^= PCR_TX_DATA_ENABLE | PCR_DCLK_EDGE_RISING;
382 hss_npe_send(port, &msg, "HSS_SET_RX_PCR");
383
384 memset(&msg, 0, sizeof(msg));
385 msg.cmd = PORT_CONFIG_WRITE;
386 msg.hss_port = port->id;
387 msg.index = HSS_CONFIG_CORE_CR;
388 msg.data32 = (port->loopback ? CCR_LOOPBACK : 0) |
389 (port->id ? CCR_SECOND_HSS : 0);
390 hss_npe_send(port, &msg, "HSS_SET_CORE_CR");
391
392 memset(&msg, 0, sizeof(msg));
393 msg.cmd = PORT_CONFIG_WRITE;
394 msg.hss_port = port->id;
395 msg.index = HSS_CONFIG_CLOCK_CR;
396 msg.data32 = CLK42X_SPEED_2048KHZ /* FIXME */;
397 hss_npe_send(port, &msg, "HSS_SET_CLOCK_CR");
398
399 memset(&msg, 0, sizeof(msg));
400 msg.cmd = PORT_CONFIG_WRITE;
401 msg.hss_port = port->id;
402 msg.index = HSS_CONFIG_TX_FCR;
403 msg.data16a = FRAME_OFFSET;
404 msg.data16b = FRAME_SIZE - 1;
405 hss_npe_send(port, &msg, "HSS_SET_TX_FCR");
406
407 memset(&msg, 0, sizeof(msg));
408 msg.cmd = PORT_CONFIG_WRITE;
409 msg.hss_port = port->id;
410 msg.index = HSS_CONFIG_RX_FCR;
411 msg.data16a = FRAME_OFFSET;
412 msg.data16b = FRAME_SIZE - 1;
413 hss_npe_send(port, &msg, "HSS_SET_RX_FCR");
414
415 hss_config_set_lut(port);
416
417 memset(&msg, 0, sizeof(msg));
418 msg.cmd = PORT_CONFIG_LOAD;
419 msg.hss_port = port->id;
420 hss_npe_send(port, &msg, "HSS_LOAD_CONFIG");
421
422 if (npe_recv_message(port->npe, &msg, "HSS_LOAD_CONFIG") ||
423 /* HSS_LOAD_CONFIG for port #1 returns port_id = #4 */
424 msg.cmd != PORT_CONFIG_LOAD || msg.data32) {
425 printk(KERN_CRIT "HSS-%i: HSS_LOAD_CONFIG failed\n",
426 port->id);
427 BUG();
428 }
429
430 /* HDLC may stop working without this - check FIXME */
431 npe_recv_message(port->npe, &msg, "FLUSH_IT");
432 }
433
434 static void hss_set_hdlc_cfg(struct port *port)
435 {
436 struct msg msg;
437
438 memset(&msg, 0, sizeof(msg));
439 msg.cmd = PKT_PIPE_HDLC_CFG_WRITE;
440 msg.hss_port = port->id;
441 msg.data8a = port->hdlc_cfg; /* rx_cfg */
442 msg.data8b = port->hdlc_cfg | (PKT_EXTRA_FLAGS << 3); /* tx_cfg */
443 hss_npe_send(port, &msg, "HSS_SET_HDLC_CFG");
444 }
445
446 static u32 hss_get_status(struct port *port)
447 {
448 struct msg msg;
449
450 memset(&msg, 0, sizeof(msg));
451 msg.cmd = PORT_ERROR_READ;
452 msg.hss_port = port->id;
453 hss_npe_send(port, &msg, "PORT_ERROR_READ");
454 if (npe_recv_message(port->npe, &msg, "PORT_ERROR_READ")) {
455 printk(KERN_CRIT "HSS-%i: unable to read HSS status\n",
456 port->id);
457 BUG();
458 }
459
460 return msg.data32;
461 }
462
463 static void hss_start_hdlc(struct port *port)
464 {
465 struct msg msg;
466
467 memset(&msg, 0, sizeof(msg));
468 msg.cmd = PKT_PIPE_FLOW_ENABLE;
469 msg.hss_port = port->id;
470 msg.data32 = 0;
471 hss_npe_send(port, &msg, "HSS_ENABLE_PKT_PIPE");
472 }
473
474 static void hss_stop_hdlc(struct port *port)
475 {
476 struct msg msg;
477
478 memset(&msg, 0, sizeof(msg));
479 msg.cmd = PKT_PIPE_FLOW_DISABLE;
480 msg.hss_port = port->id;
481 hss_npe_send(port, &msg, "HSS_DISABLE_PKT_PIPE");
482 hss_get_status(port); /* make sure it's halted */
483 }
484
485 static int hss_load_firmware(struct port *port)
486 {
487 struct msg msg;
488 int err;
489
490 if (port->initialized)
491 return 0;
492
493 if (!npe_running(port->npe) &&
494 (err = npe_load_firmware(port->npe, npe_name(port->npe),
495 port->dev)))
496 return err;
497
498 /* HDLC mode configuration */
499 memset(&msg, 0, sizeof(msg));
500 msg.cmd = PKT_NUM_PIPES_WRITE;
501 msg.hss_port = port->id;
502 msg.data8a = PKT_NUM_PIPES;
503 hss_npe_send(port, &msg, "HSS_SET_PKT_PIPES");
504
505 msg.cmd = PKT_PIPE_FIFO_SIZEW_WRITE;
506 msg.data8a = PKT_PIPE_FIFO_SIZEW;
507 hss_npe_send(port, &msg, "HSS_SET_PKT_FIFO");
508
509 msg.cmd = PKT_PIPE_MODE_WRITE;
510 msg.data8a = NPE_PKT_MODE_HDLC;
511 /* msg.data8b = inv_mask */
512 /* msg.data8c = or_mask */
513 hss_npe_send(port, &msg, "HSS_SET_PKT_MODE");
514
515 msg.cmd = PKT_PIPE_RX_SIZE_WRITE;
516 msg.data16a = HDLC_MAX_MRU; /* including CRC */
517 hss_npe_send(port, &msg, "HSS_SET_PKT_RX_SIZE");
518
519 msg.cmd = PKT_PIPE_IDLE_PATTERN_WRITE;
520 msg.data32 = 0x7F7F7F7F; /* ??? FIXME */
521 hss_npe_send(port, &msg, "HSS_SET_PKT_IDLE");
522
523 port->initialized = 1;
524 return 0;
525 }
526
527 /*****************************************************************************
528 * packetized (HDLC) operation
529 ****************************************************************************/
530
531 static inline void debug_pkt(struct net_device *dev, const char *func,
532 u8 *data, int len)
533 {
534 #if DEBUG_PKT_BYTES
535 int i;
536
537 printk(KERN_DEBUG "%s: %s(%i)", dev->name, func, len);
538 for (i = 0; i < len; i++) {
539 if (i >= DEBUG_PKT_BYTES)
540 break;
541 printk("%s%02X", !(i % 4) ? " " : "", data[i]);
542 }
543 printk("\n");
544 #endif
545 }
546
547
548 static inline void debug_desc(u32 phys, struct desc *desc)
549 {
550 #if DEBUG_DESC
551 printk(KERN_DEBUG "%X: %X %3X %3X %08X %X %X\n",
552 phys, desc->next, desc->buf_len, desc->pkt_len,
553 desc->data, desc->status, desc->error_count);
554 #endif
555 }
556
557 static inline int queue_get_desc(unsigned int queue, struct port *port,
558 int is_tx)
559 {
560 u32 phys, tab_phys, n_desc;
561 struct desc *tab;
562
563 if (!(phys = qmgr_get_entry(queue)))
564 return -1;
565
566 BUG_ON(phys & 0x1F);
567 tab_phys = is_tx ? tx_desc_phys(port, 0) : rx_desc_phys(port, 0);
568 tab = is_tx ? tx_desc_ptr(port, 0) : rx_desc_ptr(port, 0);
569 n_desc = (phys - tab_phys) / sizeof(struct desc);
570 BUG_ON(n_desc >= (is_tx ? TX_DESCS : RX_DESCS));
571 debug_desc(phys, &tab[n_desc]);
572 BUG_ON(tab[n_desc].next);
573 return n_desc;
574 }
575
576 static inline void queue_put_desc(unsigned int queue, u32 phys,
577 struct desc *desc)
578 {
579 debug_desc(phys, desc);
580 BUG_ON(phys & 0x1F);
581 qmgr_put_entry(queue, phys);
582 BUG_ON(qmgr_stat_overflow(queue));
583 }
584
585
586 static inline void dma_unmap_tx(struct port *port, struct desc *desc)
587 {
588 #ifdef __ARMEB__
589 dma_unmap_single(&port->netdev->dev, desc->data,
590 desc->buf_len, DMA_TO_DEVICE);
591 #else
592 dma_unmap_single(&port->netdev->dev, desc->data & ~3,
593 ALIGN((desc->data & 3) + desc->buf_len, 4),
594 DMA_TO_DEVICE);
595 #endif
596 }
597
598
599 static void hss_hdlc_set_carrier(void *pdev, int carrier)
600 {
601 struct net_device *netdev = pdev;
602 struct port *port = dev_to_port(netdev);
603 unsigned long flags;
604
605 spin_lock_irqsave(&npe_lock, flags);
606 port->carrier = carrier;
607 if (!port->loopback) {
608 if (carrier)
609 netif_carrier_on(netdev);
610 else
611 netif_carrier_off(netdev);
612 }
613 spin_unlock_irqrestore(&npe_lock, flags);
614 }
615
616 static void hss_hdlc_rx_irq(void *pdev)
617 {
618 struct net_device *dev = pdev;
619 struct port *port = dev_to_port(dev);
620
621 #if DEBUG_RX
622 printk(KERN_DEBUG "%s: hss_hdlc_rx_irq\n", dev->name);
623 #endif
624 qmgr_disable_irq(queue_ids[port->id].rx);
625 netif_rx_schedule(&port->napi);
626 }
627
628 static int hss_hdlc_poll(struct napi_struct *napi, int budget)
629 {
630 struct port *port = container_of(napi, struct port, napi);
631 struct net_device *dev = port->netdev;
632 unsigned int rxq = queue_ids[port->id].rx;
633 unsigned int rxfreeq = queue_ids[port->id].rxfree;
634 int received = 0;
635
636 #if DEBUG_RX
637 printk(KERN_DEBUG "%s: hss_hdlc_poll\n", dev->name);
638 #endif
639
640 while (received < budget) {
641 struct sk_buff *skb;
642 struct desc *desc;
643 int n;
644 #ifdef __ARMEB__
645 struct sk_buff *temp;
646 u32 phys;
647 #endif
648
649 if ((n = queue_get_desc(rxq, port, 0)) < 0) {
650 #if DEBUG_RX
651 printk(KERN_DEBUG "%s: hss_hdlc_poll"
652 " netif_rx_complete\n", dev->name);
653 #endif
654 netif_rx_complete(napi);
655 qmgr_enable_irq(rxq);
656 if (!qmgr_stat_empty(rxq) &&
657 netif_rx_reschedule(napi)) {
658 #if DEBUG_RX
659 printk(KERN_DEBUG "%s: hss_hdlc_poll"
660 " netif_rx_reschedule succeeded\n",
661 dev->name);
662 #endif
663 qmgr_disable_irq(rxq);
664 continue;
665 }
666 #if DEBUG_RX
667 printk(KERN_DEBUG "%s: hss_hdlc_poll all done\n",
668 dev->name);
669 #endif
670 return received; /* all work done */
671 }
672
673 desc = rx_desc_ptr(port, n);
674 #if 0 /* FIXME - error_count counts modulo 256, perhaps we should use it */
675 if (desc->error_count)
676 printk(KERN_DEBUG "%s: hss_hdlc_poll status 0x%02X"
677 " errors %u\n", dev->name, desc->status,
678 desc->error_count);
679 #endif
680 skb = NULL;
681 switch (desc->status) {
682 case 0:
683 #ifdef __ARMEB__
684 if ((skb = netdev_alloc_skb(dev, RX_SIZE)) != NULL) {
685 phys = dma_map_single(&dev->dev, skb->data,
686 RX_SIZE,
687 DMA_FROM_DEVICE);
688 if (dma_mapping_error(&dev->dev, phys)) {
689 dev_kfree_skb(skb);
690 skb = NULL;
691 }
692 }
693 #else
694 skb = netdev_alloc_skb(dev, desc->pkt_len);
695 #endif
696 if (!skb)
697 dev->stats.rx_dropped++;
698 break;
699 case ERR_HDLC_ALIGN:
700 case ERR_HDLC_ABORT:
701 dev->stats.rx_frame_errors++;
702 dev->stats.rx_errors++;
703 break;
704 case ERR_HDLC_FCS:
705 dev->stats.rx_crc_errors++;
706 dev->stats.rx_errors++;
707 break;
708 case ERR_HDLC_TOO_LONG:
709 dev->stats.rx_length_errors++;
710 dev->stats.rx_errors++;
711 break;
712 default: /* FIXME - remove printk */
713 printk(KERN_ERR "%s: hss_hdlc_poll: status 0x%02X"
714 " errors %u\n", dev->name, desc->status,
715 desc->error_count);
716 dev->stats.rx_errors++;
717 }
718
719 if (!skb) {
720 /* put the desc back on RX-ready queue */
721 desc->buf_len = RX_SIZE;
722 desc->pkt_len = desc->status = 0;
723 queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
724 continue;
725 }
726
727 /* process received frame */
728 #ifdef __ARMEB__
729 temp = skb;
730 skb = port->rx_buff_tab[n];
731 dma_unmap_single(&dev->dev, desc->data,
732 RX_SIZE, DMA_FROM_DEVICE);
733 #else
734 dma_sync_single(&dev->dev, desc->data,
735 RX_SIZE, DMA_FROM_DEVICE);
736 memcpy_swab32((u32 *)skb->data, (u32 *)port->rx_buff_tab[n],
737 ALIGN(desc->pkt_len, 4) / 4);
738 #endif
739 skb_put(skb, desc->pkt_len);
740
741 debug_pkt(dev, "hss_hdlc_poll", skb->data, skb->len);
742
743 skb->protocol = hdlc_type_trans(skb, dev);
744 dev->stats.rx_packets++;
745 dev->stats.rx_bytes += skb->len;
746 netif_receive_skb(skb);
747
748 /* put the new buffer on RX-free queue */
749 #ifdef __ARMEB__
750 port->rx_buff_tab[n] = temp;
751 desc->data = phys;
752 #endif
753 desc->buf_len = RX_SIZE;
754 desc->pkt_len = 0;
755 queue_put_desc(rxfreeq, rx_desc_phys(port, n), desc);
756 received++;
757 }
758 #if DEBUG_RX
759 printk(KERN_DEBUG "hss_hdlc_poll: end, not all work done\n");
760 #endif
761 return received; /* not all work done */
762 }
763
764
765 static void hss_hdlc_txdone_irq(void *pdev)
766 {
767 struct net_device *dev = pdev;
768 struct port *port = dev_to_port(dev);
769 int n_desc;
770
771 #if DEBUG_TX
772 printk(KERN_DEBUG DRV_NAME ": hss_hdlc_txdone_irq\n");
773 #endif
774 while ((n_desc = queue_get_desc(queue_ids[port->id].txdone,
775 port, 1)) >= 0) {
776 struct desc *desc;
777 int start;
778
779 desc = tx_desc_ptr(port, n_desc);
780
781 dev->stats.tx_packets++;
782 dev->stats.tx_bytes += desc->pkt_len;
783
784 dma_unmap_tx(port, desc);
785 #if DEBUG_TX
786 printk(KERN_DEBUG "%s: hss_hdlc_txdone_irq free %p\n",
787 dev->name, port->tx_buff_tab[n_desc]);
788 #endif
789 free_buffer_irq(port->tx_buff_tab[n_desc]);
790 port->tx_buff_tab[n_desc] = NULL;
791
792 start = qmgr_stat_empty(port->plat->txreadyq);
793 queue_put_desc(port->plat->txreadyq,
794 tx_desc_phys(port, n_desc), desc);
795 if (start) {
796 #if DEBUG_TX
797 printk(KERN_DEBUG "%s: hss_hdlc_txdone_irq xmit"
798 " ready\n", dev->name);
799 #endif
800 netif_wake_queue(dev);
801 }
802 }
803 }
804
805 static int hss_hdlc_xmit(struct sk_buff *skb, struct net_device *dev)
806 {
807 struct port *port = dev_to_port(dev);
808 unsigned int txreadyq = port->plat->txreadyq;
809 int len, offset, bytes, n;
810 void *mem;
811 u32 phys;
812 struct desc *desc;
813
814 #if DEBUG_TX
815 printk(KERN_DEBUG "%s: hss_hdlc_xmit\n", dev->name);
816 #endif
817
818 if (unlikely(skb->len > HDLC_MAX_MRU)) {
819 dev_kfree_skb(skb);
820 dev->stats.tx_errors++;
821 return NETDEV_TX_OK;
822 }
823
824 debug_pkt(dev, "hss_hdlc_xmit", skb->data, skb->len);
825
826 len = skb->len;
827 #ifdef __ARMEB__
828 offset = 0; /* no need to keep alignment */
829 bytes = len;
830 mem = skb->data;
831 #else
832 offset = (int)skb->data & 3; /* keep 32-bit alignment */
833 bytes = ALIGN(offset + len, 4);
834 if (!(mem = kmalloc(bytes, GFP_ATOMIC))) {
835 dev_kfree_skb(skb);
836 dev->stats.tx_dropped++;
837 return NETDEV_TX_OK;
838 }
839 memcpy_swab32(mem, (u32 *)((int)skb->data & ~3), bytes / 4);
840 dev_kfree_skb(skb);
841 #endif
842
843 phys = dma_map_single(&dev->dev, mem, bytes, DMA_TO_DEVICE);
844 if (dma_mapping_error(&dev->dev, phys)) {
845 #ifdef __ARMEB__
846 dev_kfree_skb(skb);
847 #else
848 kfree(mem);
849 #endif
850 dev->stats.tx_dropped++;
851 return NETDEV_TX_OK;
852 }
853
854 n = queue_get_desc(txreadyq, port, 1);
855 BUG_ON(n < 0);
856 desc = tx_desc_ptr(port, n);
857
858 #ifdef __ARMEB__
859 port->tx_buff_tab[n] = skb;
860 #else
861 port->tx_buff_tab[n] = mem;
862 #endif
863 desc->data = phys + offset;
864 desc->buf_len = desc->pkt_len = len;
865
866 wmb();
867 queue_put_desc(queue_ids[port->id].tx, tx_desc_phys(port, n), desc);
868 dev->trans_start = jiffies;
869
870 if (qmgr_stat_empty(txreadyq)) {
871 #if DEBUG_TX
872 printk(KERN_DEBUG "%s: hss_hdlc_xmit queue full\n", dev->name);
873 #endif
874 netif_stop_queue(dev);
875 /* we could miss TX ready interrupt */
876 if (!qmgr_stat_empty(txreadyq)) {
877 #if DEBUG_TX
878 printk(KERN_DEBUG "%s: hss_hdlc_xmit ready again\n",
879 dev->name);
880 #endif
881 netif_wake_queue(dev);
882 }
883 }
884
885 #if DEBUG_TX
886 printk(KERN_DEBUG "%s: hss_hdlc_xmit end\n", dev->name);
887 #endif
888 return NETDEV_TX_OK;
889 }
890
891
892 static int request_hdlc_queues(struct port *port)
893 {
894 int err;
895
896 err = qmgr_request_queue(queue_ids[port->id].rxfree, RX_DESCS, 0, 0,
897 "%s:RX-free", port->netdev->name);
898 if (err)
899 return err;
900
901 err = qmgr_request_queue(queue_ids[port->id].rx, RX_DESCS, 0, 0,
902 "%s:RX", port->netdev->name);
903 if (err)
904 goto rel_rxfree;
905
906 err = qmgr_request_queue(queue_ids[port->id].tx, TX_DESCS, 0, 0,
907 "%s:TX", port->netdev->name);
908 if (err)
909 goto rel_rx;
910
911 err = qmgr_request_queue(port->plat->txreadyq, TX_DESCS, 0, 0,
912 "%s:TX-ready", port->netdev->name);
913 if (err)
914 goto rel_tx;
915
916 err = qmgr_request_queue(queue_ids[port->id].txdone, TX_DESCS, 0, 0,
917 "%s:TX-done", port->netdev->name);
918 if (err)
919 goto rel_txready;
920 return 0;
921
922 rel_txready:
923 qmgr_release_queue(port->plat->txreadyq);
924 rel_tx:
925 qmgr_release_queue(queue_ids[port->id].tx);
926 rel_rx:
927 qmgr_release_queue(queue_ids[port->id].rx);
928 rel_rxfree:
929 qmgr_release_queue(queue_ids[port->id].rxfree);
930 printk(KERN_DEBUG "%s: unable to request hardware queues\n",
931 port->netdev->name);
932 return err;
933 }
934
935 static void release_hdlc_queues(struct port *port)
936 {
937 qmgr_release_queue(queue_ids[port->id].rxfree);
938 qmgr_release_queue(queue_ids[port->id].rx);
939 qmgr_release_queue(queue_ids[port->id].txdone);
940 qmgr_release_queue(queue_ids[port->id].tx);
941 qmgr_release_queue(port->plat->txreadyq);
942 }
943
944 static int init_hdlc_queues(struct port *port)
945 {
946 int i;
947
948 if (!ports_open)
949 if (!(dma_pool = dma_pool_create(DRV_NAME, NULL,
950 POOL_ALLOC_SIZE, 32, 0)))
951 return -ENOMEM;
952
953 if (!(port->desc_tab = dma_pool_alloc(dma_pool, GFP_KERNEL,
954 &port->desc_tab_phys)))
955 return -ENOMEM;
956 memset(port->desc_tab, 0, POOL_ALLOC_SIZE);
957 memset(port->rx_buff_tab, 0, sizeof(port->rx_buff_tab)); /* tables */
958 memset(port->tx_buff_tab, 0, sizeof(port->tx_buff_tab));
959
960 /* Setup RX buffers */
961 for (i = 0; i < RX_DESCS; i++) {
962 struct desc *desc = rx_desc_ptr(port, i);
963 buffer_t *buff;
964 void *data;
965 #ifdef __ARMEB__
966 if (!(buff = netdev_alloc_skb(port->netdev, RX_SIZE)))
967 return -ENOMEM;
968 data = buff->data;
969 #else
970 if (!(buff = kmalloc(RX_SIZE, GFP_KERNEL)))
971 return -ENOMEM;
972 data = buff;
973 #endif
974 desc->buf_len = RX_SIZE;
975 desc->data = dma_map_single(&port->netdev->dev, data,
976 RX_SIZE, DMA_FROM_DEVICE);
977 if (dma_mapping_error(&port->netdev->dev, desc->data)) {
978 free_buffer(buff);
979 return -EIO;
980 }
981 port->rx_buff_tab[i] = buff;
982 }
983
984 return 0;
985 }
986
987 static void destroy_hdlc_queues(struct port *port)
988 {
989 int i;
990
991 if (port->desc_tab) {
992 for (i = 0; i < RX_DESCS; i++) {
993 struct desc *desc = rx_desc_ptr(port, i);
994 buffer_t *buff = port->rx_buff_tab[i];
995 if (buff) {
996 dma_unmap_single(&port->netdev->dev,
997 desc->data, RX_SIZE,
998 DMA_FROM_DEVICE);
999 free_buffer(buff);
1000 }
1001 }
1002 for (i = 0; i < TX_DESCS; i++) {
1003 struct desc *desc = tx_desc_ptr(port, i);
1004 buffer_t *buff = port->tx_buff_tab[i];
1005 if (buff) {
1006 dma_unmap_tx(port, desc);
1007 free_buffer(buff);
1008 }
1009 }
1010 dma_pool_free(dma_pool, port->desc_tab, port->desc_tab_phys);
1011 port->desc_tab = NULL;
1012 }
1013
1014 if (!ports_open && dma_pool) {
1015 dma_pool_destroy(dma_pool);
1016 dma_pool = NULL;
1017 }
1018 }
1019
1020 static int hss_hdlc_open(struct net_device *dev)
1021 {
1022 struct port *port = dev_to_port(dev);
1023 unsigned long flags;
1024 int i, err = 0;
1025
1026 if ((err = hdlc_open(dev)))
1027 return err;
1028
1029 if ((err = hss_load_firmware(port)))
1030 goto err_hdlc_close;
1031
1032 if ((err = request_hdlc_queues(port)))
1033 goto err_hdlc_close;
1034
1035 if ((err = init_hdlc_queues(port)))
1036 goto err_destroy_queues;
1037
1038 spin_lock_irqsave(&npe_lock, flags);
1039 if (port->plat->open)
1040 if ((err = port->plat->open(port->id, dev,
1041 hss_hdlc_set_carrier)))
1042 goto err_unlock;
1043 spin_unlock_irqrestore(&npe_lock, flags);
1044
1045 /* Populate queues with buffers, no failure after this point */
1046 for (i = 0; i < TX_DESCS; i++)
1047 queue_put_desc(port->plat->txreadyq,
1048 tx_desc_phys(port, i), tx_desc_ptr(port, i));
1049
1050 for (i = 0; i < RX_DESCS; i++)
1051 queue_put_desc(queue_ids[port->id].rxfree,
1052 rx_desc_phys(port, i), rx_desc_ptr(port, i));
1053
1054 napi_enable(&port->napi);
1055 netif_start_queue(dev);
1056
1057 qmgr_set_irq(queue_ids[port->id].rx, QUEUE_IRQ_SRC_NOT_EMPTY,
1058 hss_hdlc_rx_irq, dev);
1059
1060 qmgr_set_irq(queue_ids[port->id].txdone, QUEUE_IRQ_SRC_NOT_EMPTY,
1061 hss_hdlc_txdone_irq, dev);
1062 qmgr_enable_irq(queue_ids[port->id].txdone);
1063
1064 ports_open++;
1065
1066 hss_set_hdlc_cfg(port);
1067 hss_config(port);
1068
1069 hss_start_hdlc(port);
1070
1071 /* we may already have RX data, enables IRQ */
1072 netif_rx_schedule(&port->napi);
1073 return 0;
1074
1075 err_unlock:
1076 spin_unlock_irqrestore(&npe_lock, flags);
1077 err_destroy_queues:
1078 destroy_hdlc_queues(port);
1079 release_hdlc_queues(port);
1080 err_hdlc_close:
1081 hdlc_close(dev);
1082 return err;
1083 }
1084
1085 static int hss_hdlc_close(struct net_device *dev)
1086 {
1087 struct port *port = dev_to_port(dev);
1088 unsigned long flags;
1089 int i, buffs = RX_DESCS; /* allocated RX buffers */
1090
1091 spin_lock_irqsave(&npe_lock, flags);
1092 ports_open--;
1093 qmgr_disable_irq(queue_ids[port->id].rx);
1094 netif_stop_queue(dev);
1095 napi_disable(&port->napi);
1096
1097 hss_stop_hdlc(port);
1098
1099 while (queue_get_desc(queue_ids[port->id].rxfree, port, 0) >= 0)
1100 buffs--;
1101 while (queue_get_desc(queue_ids[port->id].rx, port, 0) >= 0)
1102 buffs--;
1103
1104 if (buffs)
1105 printk(KERN_CRIT "%s: unable to drain RX queue, %i buffer(s)"
1106 " left in NPE\n", dev->name, buffs);
1107
1108 buffs = TX_DESCS;
1109 while (queue_get_desc(queue_ids[port->id].tx, port, 1) >= 0)
1110 buffs--; /* cancel TX */
1111
1112 i = 0;
1113 do {
1114 while (queue_get_desc(port->plat->txreadyq, port, 1) >= 0)
1115 buffs--;
1116 if (!buffs)
1117 break;
1118 } while (++i < MAX_CLOSE_WAIT);
1119
1120 if (buffs)
1121 printk(KERN_CRIT "%s: unable to drain TX queue, %i buffer(s) "
1122 "left in NPE\n", dev->name, buffs);
1123 #if DEBUG_CLOSE
1124 if (!buffs)
1125 printk(KERN_DEBUG "Draining TX queues took %i cycles\n", i);
1126 #endif
1127 qmgr_disable_irq(queue_ids[port->id].txdone);
1128
1129 if (port->plat->close)
1130 port->plat->close(port->id, dev);
1131 spin_unlock_irqrestore(&npe_lock, flags);
1132
1133 destroy_hdlc_queues(port);
1134 release_hdlc_queues(port);
1135 hdlc_close(dev);
1136 return 0;
1137 }
1138
1139
1140 static int hss_hdlc_attach(struct net_device *dev, unsigned short encoding,
1141 unsigned short parity)
1142 {
1143 struct port *port = dev_to_port(dev);
1144
1145 if (encoding != ENCODING_NRZ)
1146 return -EINVAL;
1147
1148 switch(parity) {
1149 case PARITY_CRC16_PR1_CCITT:
1150 port->hdlc_cfg = 0;
1151 return 0;
1152
1153 case PARITY_CRC32_PR1_CCITT:
1154 port->hdlc_cfg = PKT_HDLC_CRC_32;
1155 return 0;
1156
1157 default:
1158 return -EINVAL;
1159 }
1160 }
1161
1162
1163 static int hss_hdlc_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
1164 {
1165 const size_t size = sizeof(sync_serial_settings);
1166 sync_serial_settings new_line;
1167 sync_serial_settings __user *line = ifr->ifr_settings.ifs_ifsu.sync;
1168 struct port *port = dev_to_port(dev);
1169 unsigned long flags;
1170 int clk;
1171
1172 if (cmd != SIOCWANDEV)
1173 return hdlc_ioctl(dev, ifr, cmd);
1174
1175 switch(ifr->ifr_settings.type) {
1176 case IF_GET_IFACE:
1177 ifr->ifr_settings.type = IF_IFACE_V35;
1178 if (ifr->ifr_settings.size < size) {
1179 ifr->ifr_settings.size = size; /* data size wanted */
1180 return -ENOBUFS;
1181 }
1182 memset(&new_line, 0, sizeof(new_line));
1183 new_line.clock_type = port->clock_type;
1184 new_line.clock_rate = 2048000; /* FIXME */
1185 new_line.loopback = port->loopback;
1186 if (copy_to_user(line, &new_line, size))
1187 return -EFAULT;
1188 return 0;
1189
1190 case IF_IFACE_SYNC_SERIAL:
1191 case IF_IFACE_V35:
1192 if(!capable(CAP_NET_ADMIN))
1193 return -EPERM;
1194 if (copy_from_user(&new_line, line, size))
1195 return -EFAULT;
1196
1197 clk = new_line.clock_type;
1198 if (port->plat->set_clock)
1199 clk = port->plat->set_clock(port->id, clk);
1200
1201 if (clk != CLOCK_EXT && clk != CLOCK_INT)
1202 return -EINVAL; /* No such clock setting */
1203
1204 if (new_line.loopback != 0 && new_line.loopback != 1)
1205 return -EINVAL;
1206
1207 port->clock_type = clk; /* Update settings */
1208 /* FIXME port->clock_rate = new_line.clock_rate */;
1209 port->loopback = new_line.loopback;
1210
1211 spin_lock_irqsave(&npe_lock, flags);
1212
1213 if (dev->flags & IFF_UP)
1214 hss_config(port);
1215
1216 if (port->loopback || port->carrier)
1217 netif_carrier_on(port->netdev);
1218 else
1219 netif_carrier_off(port->netdev);
1220 spin_unlock_irqrestore(&npe_lock, flags);
1221
1222 return 0;
1223
1224 default:
1225 return hdlc_ioctl(dev, ifr, cmd);
1226 }
1227 }
1228
1229 /*****************************************************************************
1230 * initialization
1231 ****************************************************************************/
1232
1233 static int __devinit hss_init_one(struct platform_device *pdev)
1234 {
1235 struct port *port;
1236 struct net_device *dev;
1237 hdlc_device *hdlc;
1238 int err;
1239
1240 if ((port = kzalloc(sizeof(*port), GFP_KERNEL)) == NULL)
1241 return -ENOMEM;
1242
1243 if ((port->npe = npe_request(0)) == NULL) {
1244 err = -ENOSYS;
1245 goto err_free;
1246 }
1247
1248 if ((port->netdev = dev = alloc_hdlcdev(port)) == NULL) {
1249 err = -ENOMEM;
1250 goto err_plat;
1251 }
1252
1253 SET_NETDEV_DEV(dev, &pdev->dev);
1254 hdlc = dev_to_hdlc(dev);
1255 hdlc->attach = hss_hdlc_attach;
1256 hdlc->xmit = hss_hdlc_xmit;
1257 dev->open = hss_hdlc_open;
1258 dev->stop = hss_hdlc_close;
1259 dev->do_ioctl = hss_hdlc_ioctl;
1260 dev->tx_queue_len = 100;
1261 port->clock_type = CLOCK_EXT;
1262 port->clock_rate = 2048000;
1263 port->id = pdev->id;
1264 port->dev = &pdev->dev;
1265 port->plat = pdev->dev.platform_data;
1266 netif_napi_add(dev, &port->napi, hss_hdlc_poll, NAPI_WEIGHT);
1267
1268 if ((err = register_hdlc_device(dev)))
1269 goto err_free_netdev;
1270
1271 platform_set_drvdata(pdev, port);
1272
1273 printk(KERN_INFO "%s: HSS-%i\n", dev->name, port->id);
1274 return 0;
1275
1276 err_free_netdev:
1277 free_netdev(dev);
1278 err_plat:
1279 npe_release(port->npe);
1280 err_free:
1281 kfree(port);
1282 return err;
1283 }
1284
1285 static int __devexit hss_remove_one(struct platform_device *pdev)
1286 {
1287 struct port *port = platform_get_drvdata(pdev);
1288
1289 unregister_hdlc_device(port->netdev);
1290 free_netdev(port->netdev);
1291 npe_release(port->npe);
1292 platform_set_drvdata(pdev, NULL);
1293 kfree(port);
1294 return 0;
1295 }
1296
1297 static struct platform_driver ixp4xx_hss_driver = {
1298 .driver.name = DRV_NAME,
1299 .probe = hss_init_one,
1300 .remove = hss_remove_one,
1301 };
1302
1303 static int __init hss_init_module(void)
1304 {
1305 if ((ixp4xx_read_feature_bits() &
1306 (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) !=
1307 (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS))
1308 return -ENOSYS;
1309
1310 spin_lock_init(&npe_lock);
1311
1312 return platform_driver_register(&ixp4xx_hss_driver);
1313 }
1314
1315 static void __exit hss_cleanup_module(void)
1316 {
1317 platform_driver_unregister(&ixp4xx_hss_driver);
1318 }
1319
1320 MODULE_AUTHOR("Krzysztof Halasa");
1321 MODULE_DESCRIPTION("Intel IXP4xx HSS driver");
1322 MODULE_LICENSE("GPL v2");
1323 MODULE_ALIAS("platform:ixp4xx_hss");
1324 module_init(hss_init_module);
1325 module_exit(hss_cleanup_module);
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