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x86: optimize lock prefix switching to run less frequently
[linux-2.6/mini2440.git] / drivers / scsi / dec_esp.c
blobd42ad663ffee83a60d7956854e6b493b00f42a61
1 /*
2 * dec_esp.c: Driver for SCSI chips on IOASIC based TURBOchannel DECstations
3 * and TURBOchannel PMAZ-A cards
4 *
5 * TURBOchannel changes by Harald Koerfgen
6 * PMAZ-A support by David Airlie
7 *
8 * based on jazz_esp.c:
9 * Copyright (C) 1997 Thomas Bogendoerfer (tsbogend@alpha.franken.de)
10 *
11 * jazz_esp is based on David S. Miller's ESP driver and cyber_esp
12 *
13 * 20000819 - Small PMAZ-AA fixes by Florian Lohoff <flo@rfc822.org>
14 * Be warned the PMAZ-AA works currently as a single card.
15 * Dont try to put multiple cards in one machine - They are
16 * both detected but it may crash under high load garbling your
17 * data.
18 * 20001005 - Initialization fixes for 2.4.0-test9
19 * Florian Lohoff <flo@rfc822.org>
20 *
21 * Copyright (C) 2002, 2003, 2005, 2006 Maciej W. Rozycki
22 */
23
24 #include <linux/kernel.h>
25 #include <linux/delay.h>
26 #include <linux/types.h>
27 #include <linux/string.h>
28 #include <linux/slab.h>
29 #include <linux/blkdev.h>
30 #include <linux/proc_fs.h>
31 #include <linux/spinlock.h>
32 #include <linux/stat.h>
33 #include <linux/tc.h>
34
35 #include <asm/dma.h>
36 #include <asm/irq.h>
37 #include <asm/pgtable.h>
38 #include <asm/system.h>
39
40 #include <asm/dec/interrupts.h>
41 #include <asm/dec/ioasic.h>
42 #include <asm/dec/ioasic_addrs.h>
43 #include <asm/dec/ioasic_ints.h>
44 #include <asm/dec/machtype.h>
45 #include <asm/dec/system.h>
46
47 #define DEC_SCSI_SREG 0
48 #define DEC_SCSI_DMAREG 0x40000
49 #define DEC_SCSI_SRAM 0x80000
50 #define DEC_SCSI_DIAG 0xC0000
51
52 #include "scsi.h"
53 #include <scsi/scsi_host.h>
54 #include "NCR53C9x.h"
55
56 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count);
57 static void dma_drain(struct NCR_ESP *esp);
58 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd *sp);
59 static void dma_dump_state(struct NCR_ESP *esp);
60 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
61 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
62 static void dma_ints_off(struct NCR_ESP *esp);
63 static void dma_ints_on(struct NCR_ESP *esp);
64 static int dma_irq_p(struct NCR_ESP *esp);
65 static int dma_ports_p(struct NCR_ESP *esp);
66 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
67 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
68 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp);
69 static void dma_advance_sg(struct scsi_cmnd * sp);
70
71 static void pmaz_dma_drain(struct NCR_ESP *esp);
72 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length);
73 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length);
74 static void pmaz_dma_ints_off(struct NCR_ESP *esp);
75 static void pmaz_dma_ints_on(struct NCR_ESP *esp);
76 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write);
77 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp);
78
79 #define TC_ESP_RAM_SIZE 0x20000
80 #define ESP_TGT_DMA_SIZE ((TC_ESP_RAM_SIZE/7) & ~(sizeof(int)-1))
81 #define ESP_NCMD 7
82
83 #define TC_ESP_DMAR_MASK 0x1ffff
84 #define TC_ESP_DMAR_WRITE 0x80000000
85 #define TC_ESP_DMA_ADDR(x) ((unsigned)(x) & TC_ESP_DMAR_MASK)
86
87 u32 esp_virt_buffer;
88 int scsi_current_length;
89
90 volatile unsigned char cmd_buffer[16];
91 volatile unsigned char pmaz_cmd_buffer[16];
92 /* This is where all commands are put
93 * before they are trasfered to the ESP chip
94 * via PIO.
95 */
96
97 static irqreturn_t scsi_dma_merr_int(int, void *);
98 static irqreturn_t scsi_dma_err_int(int, void *);
99 static irqreturn_t scsi_dma_int(int, void *);
100
101 static struct scsi_host_template dec_esp_template = {
102 .module = THIS_MODULE,
103 .name = "NCR53C94",
104 .info = esp_info,
105 .queuecommand = esp_queue,
106 .eh_abort_handler = esp_abort,
107 .eh_bus_reset_handler = esp_reset,
108 .slave_alloc = esp_slave_alloc,
109 .slave_destroy = esp_slave_destroy,
110 .proc_info = esp_proc_info,
111 .proc_name = "dec_esp",
112 .can_queue = 7,
113 .sg_tablesize = SG_ALL,
114 .cmd_per_lun = 1,
115 .use_clustering = DISABLE_CLUSTERING,
116 };
117
118 static struct NCR_ESP *dec_esp_platform;
119
120 /***************************************************************** Detection */
121 static int dec_esp_platform_probe(void)
122 {
123 struct NCR_ESP *esp;
124 int err = 0;
125
126 if (IOASIC) {
127 esp = esp_allocate(&dec_esp_template, NULL, 1);
128
129 /* Do command transfer with programmed I/O */
130 esp->do_pio_cmds = 1;
131
132 /* Required functions */
133 esp->dma_bytes_sent = &dma_bytes_sent;
134 esp->dma_can_transfer = &dma_can_transfer;
135 esp->dma_dump_state = &dma_dump_state;
136 esp->dma_init_read = &dma_init_read;
137 esp->dma_init_write = &dma_init_write;
138 esp->dma_ints_off = &dma_ints_off;
139 esp->dma_ints_on = &dma_ints_on;
140 esp->dma_irq_p = &dma_irq_p;
141 esp->dma_ports_p = &dma_ports_p;
142 esp->dma_setup = &dma_setup;
143
144 /* Optional functions */
145 esp->dma_barrier = 0;
146 esp->dma_drain = &dma_drain;
147 esp->dma_invalidate = 0;
148 esp->dma_irq_entry = 0;
149 esp->dma_irq_exit = 0;
150 esp->dma_poll = 0;
151 esp->dma_reset = 0;
152 esp->dma_led_off = 0;
153 esp->dma_led_on = 0;
154
155 /* virtual DMA functions */
156 esp->dma_mmu_get_scsi_one = &dma_mmu_get_scsi_one;
157 esp->dma_mmu_get_scsi_sgl = &dma_mmu_get_scsi_sgl;
158 esp->dma_mmu_release_scsi_one = 0;
159 esp->dma_mmu_release_scsi_sgl = 0;
160 esp->dma_advance_sg = &dma_advance_sg;
161
162
163 /* SCSI chip speed */
164 esp->cfreq = 25000000;
165
166 esp->dregs = 0;
167
168 /* ESP register base */
169 esp->eregs = (void *)CKSEG1ADDR(dec_kn_slot_base +
170 IOASIC_SCSI);
171
172 /* Set the command buffer */
173 esp->esp_command = (volatile unsigned char *) cmd_buffer;
174
175 /* get virtual dma address for command buffer */
176 esp->esp_command_dvma = virt_to_phys(cmd_buffer);
177
178 esp->irq = dec_interrupt[DEC_IRQ_ASC];
179
180 esp->scsi_id = 7;
181
182 /* Check for differential SCSI-bus */
183 esp->diff = 0;
184
185 err = request_irq(esp->irq, esp_intr, IRQF_DISABLED,
186 "ncr53c94", esp->ehost);
187 if (err)
188 goto err_alloc;
189 err = request_irq(dec_interrupt[DEC_IRQ_ASC_MERR],
190 scsi_dma_merr_int, IRQF_DISABLED,
191 "ncr53c94 error", esp->ehost);
192 if (err)
193 goto err_irq;
194 err = request_irq(dec_interrupt[DEC_IRQ_ASC_ERR],
195 scsi_dma_err_int, IRQF_DISABLED,
196 "ncr53c94 overrun", esp->ehost);
197 if (err)
198 goto err_irq_merr;
199 err = request_irq(dec_interrupt[DEC_IRQ_ASC_DMA], scsi_dma_int,
200 IRQF_DISABLED, "ncr53c94 dma", esp->ehost);
201 if (err)
202 goto err_irq_err;
203
204 esp_initialize(esp);
205
206 err = scsi_add_host(esp->ehost, NULL);
207 if (err) {
208 printk(KERN_ERR "ESP: Unable to register adapter\n");
209 goto err_irq_dma;
210 }
211
212 scsi_scan_host(esp->ehost);
213
214 dec_esp_platform = esp;
215 }
216
217 return 0;
218
219 err_irq_dma:
220 free_irq(dec_interrupt[DEC_IRQ_ASC_DMA], esp->ehost);
221 err_irq_err:
222 free_irq(dec_interrupt[DEC_IRQ_ASC_ERR], esp->ehost);
223 err_irq_merr:
224 free_irq(dec_interrupt[DEC_IRQ_ASC_MERR], esp->ehost);
225 err_irq:
226 free_irq(esp->irq, esp->ehost);
227 err_alloc:
228 esp_deallocate(esp);
229 scsi_host_put(esp->ehost);
230 return err;
231 }
232
233 static int __init dec_esp_probe(struct device *dev)
234 {
235 struct NCR_ESP *esp;
236 resource_size_t start, len;
237 int err;
238
239 esp = esp_allocate(&dec_esp_template, NULL, 1);
240
241 dev_set_drvdata(dev, esp);
242
243 start = to_tc_dev(dev)->resource.start;
244 len = to_tc_dev(dev)->resource.end - start + 1;
245
246 if (!request_mem_region(start, len, dev->bus_id)) {
247 printk(KERN_ERR "%s: Unable to reserve MMIO resource\n",
248 dev->bus_id);
249 err = -EBUSY;
250 goto err_alloc;
251 }
252
253 /* Store base addr into esp struct. */
254 esp->slot = start;
255
256 esp->dregs = 0;
257 esp->eregs = (void *)CKSEG1ADDR(start + DEC_SCSI_SREG);
258 esp->do_pio_cmds = 1;
259
260 /* Set the command buffer. */
261 esp->esp_command = (volatile unsigned char *)pmaz_cmd_buffer;
262
263 /* Get virtual dma address for command buffer. */
264 esp->esp_command_dvma = virt_to_phys(pmaz_cmd_buffer);
265
266 esp->cfreq = tc_get_speed(to_tc_dev(dev)->bus);
267
268 esp->irq = to_tc_dev(dev)->interrupt;
269
270 /* Required functions. */
271 esp->dma_bytes_sent = &dma_bytes_sent;
272 esp->dma_can_transfer = &dma_can_transfer;
273 esp->dma_dump_state = &dma_dump_state;
274 esp->dma_init_read = &pmaz_dma_init_read;
275 esp->dma_init_write = &pmaz_dma_init_write;
276 esp->dma_ints_off = &pmaz_dma_ints_off;
277 esp->dma_ints_on = &pmaz_dma_ints_on;
278 esp->dma_irq_p = &dma_irq_p;
279 esp->dma_ports_p = &dma_ports_p;
280 esp->dma_setup = &pmaz_dma_setup;
281
282 /* Optional functions. */
283 esp->dma_barrier = 0;
284 esp->dma_drain = &pmaz_dma_drain;
285 esp->dma_invalidate = 0;
286 esp->dma_irq_entry = 0;
287 esp->dma_irq_exit = 0;
288 esp->dma_poll = 0;
289 esp->dma_reset = 0;
290 esp->dma_led_off = 0;
291 esp->dma_led_on = 0;
292
293 esp->dma_mmu_get_scsi_one = pmaz_dma_mmu_get_scsi_one;
294 esp->dma_mmu_get_scsi_sgl = 0;
295 esp->dma_mmu_release_scsi_one = 0;
296 esp->dma_mmu_release_scsi_sgl = 0;
297 esp->dma_advance_sg = 0;
298
299 err = request_irq(esp->irq, esp_intr, IRQF_DISABLED, "PMAZ_AA",
300 esp->ehost);
301 if (err) {
302 printk(KERN_ERR "%s: Unable to get IRQ %d\n",
303 dev->bus_id, esp->irq);
304 goto err_resource;
305 }
306
307 esp->scsi_id = 7;
308 esp->diff = 0;
309 esp_initialize(esp);
310
311 err = scsi_add_host(esp->ehost, dev);
312 if (err) {
313 printk(KERN_ERR "%s: Unable to register adapter\n",
314 dev->bus_id);
315 goto err_irq;
316 }
317
318 scsi_scan_host(esp->ehost);
319
320 return 0;
321
322 err_irq:
323 free_irq(esp->irq, esp->ehost);
324
325 err_resource:
326 release_mem_region(start, len);
327
328 err_alloc:
329 esp_deallocate(esp);
330 scsi_host_put(esp->ehost);
331 return err;
332 }
333
334 static void __exit dec_esp_platform_remove(void)
335 {
336 struct NCR_ESP *esp = dec_esp_platform;
337
338 free_irq(esp->irq, esp->ehost);
339 esp_deallocate(esp);
340 scsi_host_put(esp->ehost);
341 dec_esp_platform = NULL;
342 }
343
344 static void __exit dec_esp_remove(struct device *dev)
345 {
346 struct NCR_ESP *esp = dev_get_drvdata(dev);
347
348 free_irq(esp->irq, esp->ehost);
349 esp_deallocate(esp);
350 scsi_host_put(esp->ehost);
351 }
352
353
354 /************************************************************* DMA Functions */
355 static irqreturn_t scsi_dma_merr_int(int irq, void *dev_id)
356 {
357 printk("Got unexpected SCSI DMA Interrupt! < ");
358 printk("SCSI_DMA_MEMRDERR ");
359 printk(">\n");
360
361 return IRQ_HANDLED;
362 }
363
364 static irqreturn_t scsi_dma_err_int(int irq, void *dev_id)
365 {
366 /* empty */
367
368 return IRQ_HANDLED;
369 }
370
371 static irqreturn_t scsi_dma_int(int irq, void *dev_id)
372 {
373 u32 scsi_next_ptr;
374
375 scsi_next_ptr = ioasic_read(IO_REG_SCSI_DMA_P);
376
377 /* next page */
378 scsi_next_ptr = (((scsi_next_ptr >> 3) + PAGE_SIZE) & PAGE_MASK) << 3;
379 ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
380 fast_iob();
381
382 return IRQ_HANDLED;
383 }
384
385 static int dma_bytes_sent(struct NCR_ESP *esp, int fifo_count)
386 {
387 return fifo_count;
388 }
389
390 static void dma_drain(struct NCR_ESP *esp)
391 {
392 u32 nw, data0, data1, scsi_data_ptr;
393 u16 *p;
394
395 nw = ioasic_read(IO_REG_SCSI_SCR);
396
397 /*
398 * Is there something in the dma buffers left?
399 */
400 if (nw) {
401 scsi_data_ptr = ioasic_read(IO_REG_SCSI_DMA_P) >> 3;
402 p = phys_to_virt(scsi_data_ptr);
403 switch (nw) {
404 case 1:
405 data0 = ioasic_read(IO_REG_SCSI_SDR0);
406 p[0] = data0 & 0xffff;
407 break;
408 case 2:
409 data0 = ioasic_read(IO_REG_SCSI_SDR0);
410 p[0] = data0 & 0xffff;
411 p[1] = (data0 >> 16) & 0xffff;
412 break;
413 case 3:
414 data0 = ioasic_read(IO_REG_SCSI_SDR0);
415 data1 = ioasic_read(IO_REG_SCSI_SDR1);
416 p[0] = data0 & 0xffff;
417 p[1] = (data0 >> 16) & 0xffff;
418 p[2] = data1 & 0xffff;
419 break;
420 default:
421 printk("Strange: %d words in dma buffer left\n", nw);
422 break;
423 }
424 }
425 }
426
427 static int dma_can_transfer(struct NCR_ESP *esp, struct scsi_cmnd * sp)
428 {
429 return sp->SCp.this_residual;
430 }
431
432 static void dma_dump_state(struct NCR_ESP *esp)
433 {
434 }
435
436 static void dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
437 {
438 u32 scsi_next_ptr, ioasic_ssr;
439 unsigned long flags;
440
441 if (vaddress & 3)
442 panic("dec_esp.c: unable to handle partial word transfers, yet...");
443
444 dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
445
446 spin_lock_irqsave(&ioasic_ssr_lock, flags);
447
448 fast_mb();
449 ioasic_ssr = ioasic_read(IO_REG_SSR);
450
451 ioasic_ssr &= ~IO_SSR_SCSI_DMA_EN;
452 ioasic_write(IO_REG_SSR, ioasic_ssr);
453
454 fast_wmb();
455 ioasic_write(IO_REG_SCSI_SCR, 0);
456 ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
457
458 /* prepare for next page */
459 scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
460 ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
461
462 ioasic_ssr |= (IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
463 fast_wmb();
464 ioasic_write(IO_REG_SSR, ioasic_ssr);
465
466 fast_iob();
467 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
468 }
469
470 static void dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
471 {
472 u32 scsi_next_ptr, ioasic_ssr;
473 unsigned long flags;
474
475 if (vaddress & 3)
476 panic("dec_esp.c: unable to handle partial word transfers, yet...");
477
478 dma_cache_wback_inv((unsigned long) phys_to_virt(vaddress), length);
479
480 spin_lock_irqsave(&ioasic_ssr_lock, flags);
481
482 fast_mb();
483 ioasic_ssr = ioasic_read(IO_REG_SSR);
484
485 ioasic_ssr &= ~(IO_SSR_SCSI_DMA_DIR | IO_SSR_SCSI_DMA_EN);
486 ioasic_write(IO_REG_SSR, ioasic_ssr);
487
488 fast_wmb();
489 ioasic_write(IO_REG_SCSI_SCR, 0);
490 ioasic_write(IO_REG_SCSI_DMA_P, vaddress << 3);
491
492 /* prepare for next page */
493 scsi_next_ptr = ((vaddress + PAGE_SIZE) & PAGE_MASK) << 3;
494 ioasic_write(IO_REG_SCSI_DMA_BP, scsi_next_ptr);
495
496 ioasic_ssr |= IO_SSR_SCSI_DMA_EN;
497 fast_wmb();
498 ioasic_write(IO_REG_SSR, ioasic_ssr);
499
500 fast_iob();
501 spin_unlock_irqrestore(&ioasic_ssr_lock, flags);
502 }
503
504 static void dma_ints_off(struct NCR_ESP *esp)
505 {
506 disable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
507 }
508
509 static void dma_ints_on(struct NCR_ESP *esp)
510 {
511 enable_irq(dec_interrupt[DEC_IRQ_ASC_DMA]);
512 }
513
514 static int dma_irq_p(struct NCR_ESP *esp)
515 {
516 return (esp->eregs->esp_status & ESP_STAT_INTR);
517 }
518
519 static int dma_ports_p(struct NCR_ESP *esp)
520 {
521 /*
522 * FIXME: what's this good for?
523 */
524 return 1;
525 }
526
527 static void dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
528 {
529 /*
530 * DMA_ST_WRITE means "move data from device to memory"
531 * so when (write) is true, it actually means READ!
532 */
533 if (write)
534 dma_init_read(esp, addr, count);
535 else
536 dma_init_write(esp, addr, count);
537 }
538
539 static void dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
540 {
541 sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
542 }
543
544 static void dma_mmu_get_scsi_sgl(struct NCR_ESP *esp, struct scsi_cmnd * sp)
545 {
546 int sz = sp->SCp.buffers_residual;
547 struct scatterlist *sg = sp->SCp.buffer;
548
549 while (sz >= 0) {
550 sg[sz].dma_address = page_to_phys(sg[sz].page) + sg[sz].offset;
551 sz--;
552 }
553 sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
554 }
555
556 static void dma_advance_sg(struct scsi_cmnd * sp)
557 {
558 sp->SCp.ptr = (char *)(sp->SCp.buffer->dma_address);
559 }
560
561 static void pmaz_dma_drain(struct NCR_ESP *esp)
562 {
563 memcpy(phys_to_virt(esp_virt_buffer),
564 (void *)CKSEG1ADDR(esp->slot + DEC_SCSI_SRAM +
565 ESP_TGT_DMA_SIZE),
566 scsi_current_length);
567 }
568
569 static void pmaz_dma_init_read(struct NCR_ESP *esp, u32 vaddress, int length)
570 {
571 volatile u32 *dmareg =
572 (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
573
574 if (length > ESP_TGT_DMA_SIZE)
575 length = ESP_TGT_DMA_SIZE;
576
577 *dmareg = TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
578
579 iob();
580
581 esp_virt_buffer = vaddress;
582 scsi_current_length = length;
583 }
584
585 static void pmaz_dma_init_write(struct NCR_ESP *esp, u32 vaddress, int length)
586 {
587 volatile u32 *dmareg =
588 (volatile u32 *)CKSEG1ADDR(esp->slot + DEC_SCSI_DMAREG);
589
590 memcpy((void *)CKSEG1ADDR(esp->slot + DEC_SCSI_SRAM +
591 ESP_TGT_DMA_SIZE),
592 phys_to_virt(vaddress), length);
593
594 wmb();
595 *dmareg = TC_ESP_DMAR_WRITE | TC_ESP_DMA_ADDR(ESP_TGT_DMA_SIZE);
596
597 iob();
598 }
599
600 static void pmaz_dma_ints_off(struct NCR_ESP *esp)
601 {
602 }
603
604 static void pmaz_dma_ints_on(struct NCR_ESP *esp)
605 {
606 }
607
608 static void pmaz_dma_setup(struct NCR_ESP *esp, u32 addr, int count, int write)
609 {
610 /*
611 * DMA_ST_WRITE means "move data from device to memory"
612 * so when (write) is true, it actually means READ!
613 */
614 if (write)
615 pmaz_dma_init_read(esp, addr, count);
616 else
617 pmaz_dma_init_write(esp, addr, count);
618 }
619
620 static void pmaz_dma_mmu_get_scsi_one(struct NCR_ESP *esp, struct scsi_cmnd * sp)
621 {
622 sp->SCp.ptr = (char *)virt_to_phys(sp->request_buffer);
623 }
624
625
626 #ifdef CONFIG_TC
627 static int __init dec_esp_tc_probe(struct device *dev);
628 static int __exit dec_esp_tc_remove(struct device *dev);
629
630 static const struct tc_device_id dec_esp_tc_table[] = {
631 { "DEC ", "PMAZ-AA " },
632 { }
633 };
634 MODULE_DEVICE_TABLE(tc, dec_esp_tc_table);
635
636 static struct tc_driver dec_esp_tc_driver = {
637 .id_table = dec_esp_tc_table,
638 .driver = {
639 .name = "dec_esp",
640 .bus = &tc_bus_type,
641 .probe = dec_esp_tc_probe,
642 .remove = __exit_p(dec_esp_tc_remove),
643 },
644 };
645
646 static int __init dec_esp_tc_probe(struct device *dev)
647 {
648 int status = dec_esp_probe(dev);
649 if (!status)
650 get_device(dev);
651 return status;
652 }
653
654 static int __exit dec_esp_tc_remove(struct device *dev)
655 {
656 put_device(dev);
657 dec_esp_remove(dev);
658 return 0;
659 }
660 #endif
661
662 static int __init dec_esp_init(void)
663 {
664 int status;
665
666 status = tc_register_driver(&dec_esp_tc_driver);
667 if (!status)
668 dec_esp_platform_probe();
669
670 if (nesps) {
671 pr_info("ESP: Total of %d ESP hosts found, "
672 "%d actually in use.\n", nesps, esps_in_use);
673 esps_running = esps_in_use;
674 }
675
676 return status;
677 }
678
679 static void __exit dec_esp_exit(void)
680 {
681 dec_esp_platform_remove();
682 tc_unregister_driver(&dec_esp_tc_driver);
683 }
684
685
686 module_init(dec_esp_init);
687 module_exit(dec_esp_exit);
Support for the Chinese Samsung S3C2440 based development boards