Merge branch 'master' into devel
[linux-2.6] / drivers / net / wan / ixp4xx_hss.c
1 /*
2  * Intel IXP4xx HSS (synchronous serial port) driver for Linux
3  *
4  * Copyright (C) 2007-2008 Krzysztof HaƂasa <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         napi_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                                " napi_complete\n", dev->name);
653 #endif
654                         napi_complete(napi);
655                         qmgr_enable_irq(rxq);
656                         if (!qmgr_stat_empty(rxq) &&
657                             napi_reschedule(napi)) {
658 #if DEBUG_RX
659                                 printk(KERN_DEBUG "%s: hss_hdlc_poll"
660                                        " napi_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         napi_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 const struct net_device_ops hss_hdlc_ops = {
1234         .ndo_open       = hss_hdlc_open,
1235         .ndo_stop       = hss_hdlc_close,
1236         .ndo_change_mtu = hdlc_change_mtu,
1237         .ndo_start_xmit = hdlc_start_xmit,
1238         .ndo_do_ioctl   = hss_hdlc_ioctl,
1239 };
1240
1241 static int __devinit hss_init_one(struct platform_device *pdev)
1242 {
1243         struct port *port;
1244         struct net_device *dev;
1245         hdlc_device *hdlc;
1246         int err;
1247
1248         if ((port = kzalloc(sizeof(*port), GFP_KERNEL)) == NULL)
1249                 return -ENOMEM;
1250
1251         if ((port->npe = npe_request(0)) == NULL) {
1252                 err = -ENOSYS;
1253                 goto err_free;
1254         }
1255
1256         if ((port->netdev = dev = alloc_hdlcdev(port)) == NULL) {
1257                 err = -ENOMEM;
1258                 goto err_plat;
1259         }
1260
1261         SET_NETDEV_DEV(dev, &pdev->dev);
1262         hdlc = dev_to_hdlc(dev);
1263         hdlc->attach = hss_hdlc_attach;
1264         hdlc->xmit = hss_hdlc_xmit;
1265         dev->netdev_ops = &hss_hdlc_ops;
1266         dev->tx_queue_len = 100;
1267         port->clock_type = CLOCK_EXT;
1268         port->clock_rate = 2048000;
1269         port->id = pdev->id;
1270         port->dev = &pdev->dev;
1271         port->plat = pdev->dev.platform_data;
1272         netif_napi_add(dev, &port->napi, hss_hdlc_poll, NAPI_WEIGHT);
1273
1274         if ((err = register_hdlc_device(dev)))
1275                 goto err_free_netdev;
1276
1277         platform_set_drvdata(pdev, port);
1278
1279         printk(KERN_INFO "%s: HSS-%i\n", dev->name, port->id);
1280         return 0;
1281
1282 err_free_netdev:
1283         free_netdev(dev);
1284 err_plat:
1285         npe_release(port->npe);
1286 err_free:
1287         kfree(port);
1288         return err;
1289 }
1290
1291 static int __devexit hss_remove_one(struct platform_device *pdev)
1292 {
1293         struct port *port = platform_get_drvdata(pdev);
1294
1295         unregister_hdlc_device(port->netdev);
1296         free_netdev(port->netdev);
1297         npe_release(port->npe);
1298         platform_set_drvdata(pdev, NULL);
1299         kfree(port);
1300         return 0;
1301 }
1302
1303 static struct platform_driver ixp4xx_hss_driver = {
1304         .driver.name    = DRV_NAME,
1305         .probe          = hss_init_one,
1306         .remove         = hss_remove_one,
1307 };
1308
1309 static int __init hss_init_module(void)
1310 {
1311         if ((ixp4xx_read_feature_bits() &
1312              (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS)) !=
1313             (IXP4XX_FEATURE_HDLC | IXP4XX_FEATURE_HSS))
1314                 return -ENOSYS;
1315
1316         spin_lock_init(&npe_lock);
1317
1318         return platform_driver_register(&ixp4xx_hss_driver);
1319 }
1320
1321 static void __exit hss_cleanup_module(void)
1322 {
1323         platform_driver_unregister(&ixp4xx_hss_driver);
1324 }
1325
1326 MODULE_AUTHOR("Krzysztof Halasa");
1327 MODULE_DESCRIPTION("Intel IXP4xx HSS driver");
1328 MODULE_LICENSE("GPL v2");
1329 MODULE_ALIAS("platform:ixp4xx_hss");
1330 module_init(hss_init_module);
1331 module_exit(hss_cleanup_module);