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12#include <linux/module.h>
13#include <linux/types.h>
14#include <linux/ide.h>
15#include <linux/init.h>
16#include <linux/delay.h>
17#include <linux/platform_device.h>
18#include <linux/io.h>
19#include <linux/scatterlist.h>
20
21#include <asm/ide.h>
22
23#define MODNAME "tx4939ide"
24
25
26#define TX4939IDE_Data 0x000
27#define TX4939IDE_Error_Feature 0x001
28#define TX4939IDE_Sec 0x002
29#define TX4939IDE_LBA0 0x003
30#define TX4939IDE_LBA1 0x004
31#define TX4939IDE_LBA2 0x005
32#define TX4939IDE_DevHead 0x006
33#define TX4939IDE_Stat_Cmd 0x007
34#define TX4939IDE_AltStat_DevCtl 0x402
35
36#define TX4939IDE_DMA_Cmd 0x800
37#define TX4939IDE_DMA_Stat 0x802
38#define TX4939IDE_PRD_Ptr 0x804
39
40#define TX4939IDE_Sys_Ctl 0xc00
41#define TX4939IDE_Xfer_Cnt_1 0xc08
42#define TX4939IDE_Xfer_Cnt_2 0xc0a
43#define TX4939IDE_Sec_Cnt 0xc10
44#define TX4939IDE_Start_Lo_Addr 0xc18
45#define TX4939IDE_Start_Up_Addr 0xc20
46#define TX4939IDE_Add_Ctl 0xc28
47#define TX4939IDE_Lo_Burst_Cnt 0xc30
48#define TX4939IDE_Up_Burst_Cnt 0xc38
49#define TX4939IDE_PIO_Addr 0xc88
50#define TX4939IDE_H_Rst_Tim 0xc90
51#define TX4939IDE_Int_Ctl 0xc98
52#define TX4939IDE_Pkt_Cmd 0xcb8
53#define TX4939IDE_Bxfer_Cnt_Hi 0xcc0
54#define TX4939IDE_Bxfer_Cnt_Lo 0xcc8
55#define TX4939IDE_Dev_TErr 0xcd0
56#define TX4939IDE_Pkt_Xfer_Ctl 0xcd8
57#define TX4939IDE_Start_TAddr 0xce0
58
59
60#define TX4939IDE_INT_ADDRERR 0x80
61#define TX4939IDE_INT_REACHMUL 0x40
62#define TX4939IDE_INT_DEVTIMING 0x20
63#define TX4939IDE_INT_UDMATERM 0x10
64#define TX4939IDE_INT_TIMER 0x08
65#define TX4939IDE_INT_BUSERR 0x04
66#define TX4939IDE_INT_XFEREND 0x02
67#define TX4939IDE_INT_HOST 0x01
68
69#define TX4939IDE_IGNORE_INTS \
70 (TX4939IDE_INT_ADDRERR | TX4939IDE_INT_REACHMUL | \
71 TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_UDMATERM | \
72 TX4939IDE_INT_TIMER | TX4939IDE_INT_XFEREND)
73
74#ifdef __BIG_ENDIAN
75#define tx4939ide_swizzlel(a) ((a) ^ 4)
76#define tx4939ide_swizzlew(a) ((a) ^ 6)
77#define tx4939ide_swizzleb(a) ((a) ^ 7)
78#else
79#define tx4939ide_swizzlel(a) (a)
80#define tx4939ide_swizzlew(a) (a)
81#define tx4939ide_swizzleb(a) (a)
82#endif
83
84static u16 tx4939ide_readw(void __iomem *base, u32 reg)
85{
86 return __raw_readw(base + tx4939ide_swizzlew(reg));
87}
88static u8 tx4939ide_readb(void __iomem *base, u32 reg)
89{
90 return __raw_readb(base + tx4939ide_swizzleb(reg));
91}
92static void tx4939ide_writel(u32 val, void __iomem *base, u32 reg)
93{
94 __raw_writel(val, base + tx4939ide_swizzlel(reg));
95}
96static void tx4939ide_writew(u16 val, void __iomem *base, u32 reg)
97{
98 __raw_writew(val, base + tx4939ide_swizzlew(reg));
99}
100static void tx4939ide_writeb(u8 val, void __iomem *base, u32 reg)
101{
102 __raw_writeb(val, base + tx4939ide_swizzleb(reg));
103}
104
105#define TX4939IDE_BASE(hwif) ((void __iomem *)(hwif)->extra_base)
106
107static void tx4939ide_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
108{
109 int is_slave = drive->dn;
110 u32 mask, val;
111 const u8 pio = drive->pio_mode - XFER_PIO_0;
112 u8 safe = pio;
113 ide_drive_t *pair;
114
115 pair = ide_get_pair_dev(drive);
116 if (pair)
117 safe = min_t(u8, safe, pair->pio_mode - XFER_PIO_0);
118
119
120
121
122 mask = is_slave ? 0x07f00000 : 0x000007f0;
123 val = ((safe << 8) | (pio << 4)) << (is_slave ? 16 : 0);
124 hwif->select_data = (hwif->select_data & ~mask) | val;
125
126}
127
128static void tx4939ide_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
129{
130 u32 mask, val;
131 const u8 mode = drive->dma_mode;
132
133
134 if (mode >= XFER_UDMA_0)
135 val = mode - XFER_UDMA_0 + 8;
136 else
137 val = mode - XFER_MW_DMA_0 + 5;
138 if (drive->dn) {
139 mask = 0x00f00000;
140 val <<= 20;
141 } else {
142 mask = 0x000000f0;
143 val <<= 4;
144 }
145 hwif->select_data = (hwif->select_data & ~mask) | val;
146
147}
148
149static u16 tx4939ide_check_error_ints(ide_hwif_t *hwif)
150{
151 void __iomem *base = TX4939IDE_BASE(hwif);
152 u16 ctl = tx4939ide_readw(base, TX4939IDE_Int_Ctl);
153
154 if (ctl & TX4939IDE_INT_BUSERR) {
155
156 u16 sysctl = tx4939ide_readw(base, TX4939IDE_Sys_Ctl);
157
158 tx4939ide_writew(sysctl | 0x4000, base, TX4939IDE_Sys_Ctl);
159 mmiowb();
160
161 ndelay(270);
162 tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
163 }
164 if (ctl & (TX4939IDE_INT_ADDRERR |
165 TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_BUSERR))
166 pr_err("%s: Error interrupt %#x (%s%s%s )\n",
167 hwif->name, ctl,
168 ctl & TX4939IDE_INT_ADDRERR ? " Address-Error" : "",
169 ctl & TX4939IDE_INT_DEVTIMING ? " DEV-Timing" : "",
170 ctl & TX4939IDE_INT_BUSERR ? " Bus-Error" : "");
171 return ctl;
172}
173
174static void tx4939ide_clear_irq(ide_drive_t *drive)
175{
176 ide_hwif_t *hwif;
177 void __iomem *base;
178 u16 ctl;
179
180
181
182
183
184 if (drive->waiting_for_dma)
185 return;
186 hwif = drive->hwif;
187 base = TX4939IDE_BASE(hwif);
188 ctl = tx4939ide_check_error_ints(hwif);
189 tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
190}
191
192static u8 tx4939ide_cable_detect(ide_hwif_t *hwif)
193{
194 void __iomem *base = TX4939IDE_BASE(hwif);
195
196 return tx4939ide_readw(base, TX4939IDE_Sys_Ctl) & 0x2000 ?
197 ATA_CBL_PATA40 : ATA_CBL_PATA80;
198}
199
200#ifdef __BIG_ENDIAN
201static void tx4939ide_dma_host_set(ide_drive_t *drive, int on)
202{
203 ide_hwif_t *hwif = drive->hwif;
204 u8 unit = drive->dn;
205 void __iomem *base = TX4939IDE_BASE(hwif);
206 u8 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
207
208 if (on)
209 dma_stat |= (1 << (5 + unit));
210 else
211 dma_stat &= ~(1 << (5 + unit));
212
213 tx4939ide_writeb(dma_stat, base, TX4939IDE_DMA_Stat);
214}
215#else
216#define tx4939ide_dma_host_set ide_dma_host_set
217#endif
218
219static u8 tx4939ide_clear_dma_status(void __iomem *base)
220{
221 u8 dma_stat;
222
223
224 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
225
226 tx4939ide_writeb(dma_stat | ATA_DMA_INTR | ATA_DMA_ERR, base,
227 TX4939IDE_DMA_Stat);
228
229 tx4939ide_writew(TX4939IDE_IGNORE_INTS << 8, base, TX4939IDE_Int_Ctl);
230 return dma_stat;
231}
232
233#ifdef __BIG_ENDIAN
234
235static int tx4939ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
236{
237 ide_hwif_t *hwif = drive->hwif;
238 u32 *table = (u32 *)hwif->dmatable_cpu;
239 unsigned int count = 0;
240 int i;
241 struct scatterlist *sg;
242
243 for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
244 u32 cur_addr, cur_len, bcount;
245
246 cur_addr = sg_dma_address(sg);
247 cur_len = sg_dma_len(sg);
248
249
250
251
252
253 while (cur_len) {
254 if (count++ >= PRD_ENTRIES)
255 goto use_pio_instead;
256
257 bcount = 0x10000 - (cur_addr & 0xffff);
258 if (bcount > cur_len)
259 bcount = cur_len;
260
261
262
263
264 if (bcount == 0x10000)
265 bcount = 0x8000;
266 *table++ = bcount & 0xffff;
267 *table++ = cur_addr;
268 cur_addr += bcount;
269 cur_len -= bcount;
270 }
271 }
272
273 if (count) {
274 *(table - 2) |= 0x80000000;
275 return count;
276 }
277
278use_pio_instead:
279 printk(KERN_ERR "%s: %s\n", drive->name,
280 count ? "DMA table too small" : "empty DMA table?");
281
282 return 0;
283}
284#else
285#define tx4939ide_build_dmatable ide_build_dmatable
286#endif
287
288static int tx4939ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
289{
290 ide_hwif_t *hwif = drive->hwif;
291 void __iomem *base = TX4939IDE_BASE(hwif);
292 u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
293
294
295 if (tx4939ide_build_dmatable(drive, cmd) == 0)
296 return 1;
297
298
299 tx4939ide_writel(hwif->dmatable_dma, base, TX4939IDE_PRD_Ptr);
300
301
302 tx4939ide_writeb(rw, base, TX4939IDE_DMA_Cmd);
303
304
305 tx4939ide_clear_dma_status(base);
306
307 tx4939ide_writew(SECTOR_SIZE / 2, base, drive->dn ?
308 TX4939IDE_Xfer_Cnt_2 : TX4939IDE_Xfer_Cnt_1);
309
310 tx4939ide_writew(blk_rq_sectors(cmd->rq), base, TX4939IDE_Sec_Cnt);
311
312 return 0;
313}
314
315static int tx4939ide_dma_end(ide_drive_t *drive)
316{
317 ide_hwif_t *hwif = drive->hwif;
318 u8 dma_stat, dma_cmd;
319 void __iomem *base = TX4939IDE_BASE(hwif);
320 u16 ctl = tx4939ide_readw(base, TX4939IDE_Int_Ctl);
321
322
323 dma_cmd = tx4939ide_readb(base, TX4939IDE_DMA_Cmd);
324
325 tx4939ide_writeb(dma_cmd & ~ATA_DMA_START, base, TX4939IDE_DMA_Cmd);
326
327
328 dma_stat = tx4939ide_clear_dma_status(base);
329
330#define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
331
332
333 if ((dma_stat & CHECK_DMA_MASK) == 0 &&
334 (ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST)) ==
335 (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST))
336
337 return 0;
338 return ((dma_stat & CHECK_DMA_MASK) !=
339 ATA_DMA_INTR) ? 0x10 | dma_stat : 0;
340}
341
342
343static int tx4939ide_dma_test_irq(ide_drive_t *drive)
344{
345 ide_hwif_t *hwif = drive->hwif;
346 void __iomem *base = TX4939IDE_BASE(hwif);
347 u16 ctl, ide_int;
348 u8 dma_stat, stat;
349 int found = 0;
350
351 ctl = tx4939ide_check_error_ints(hwif);
352 ide_int = ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST);
353 switch (ide_int) {
354 case TX4939IDE_INT_HOST:
355
356 stat = tx4939ide_readb(base, TX4939IDE_AltStat_DevCtl);
357 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_ERR)) == ATA_ERR)
358 found = 1;
359 else
360
361 ctl &= ~TX4939IDE_INT_XFEREND << 8;
362 ctl |= ide_int << 8;
363 break;
364 case TX4939IDE_INT_HOST | TX4939IDE_INT_XFEREND:
365 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
366 if (!(dma_stat & ATA_DMA_INTR))
367 pr_warning("%s: weird interrupt status. "
368 "DMA_Stat %#02x int_ctl %#04x\n",
369 hwif->name, dma_stat, ctl);
370 found = 1;
371 break;
372 }
373
374
375
376
377 ctl &= ~ide_int;
378 tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
379 return found;
380}
381
382#ifdef __BIG_ENDIAN
383static u8 tx4939ide_dma_sff_read_status(ide_hwif_t *hwif)
384{
385 void __iomem *base = TX4939IDE_BASE(hwif);
386
387 return tx4939ide_readb(base, TX4939IDE_DMA_Stat);
388}
389#else
390#define tx4939ide_dma_sff_read_status ide_dma_sff_read_status
391#endif
392
393static void tx4939ide_init_hwif(ide_hwif_t *hwif)
394{
395 void __iomem *base = TX4939IDE_BASE(hwif);
396
397
398 tx4939ide_writew(0x8000, base, TX4939IDE_Sys_Ctl);
399 mmiowb();
400
401 ndelay(450);
402 tx4939ide_writew(0x0000, base, TX4939IDE_Sys_Ctl);
403
404 tx4939ide_writew((TX4939IDE_IGNORE_INTS << 8) | 0xff, base,
405 TX4939IDE_Int_Ctl);
406
407 tx4939ide_writew(0x0008, base, TX4939IDE_Lo_Burst_Cnt);
408 tx4939ide_writew(0, base, TX4939IDE_Up_Burst_Cnt);
409}
410
411static int tx4939ide_init_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
412{
413 hwif->dma_base =
414 hwif->extra_base + tx4939ide_swizzleb(TX4939IDE_DMA_Cmd);
415
416
417
418
419 return ide_allocate_dma_engine(hwif);
420}
421
422static void tx4939ide_tf_load_fixup(ide_drive_t *drive)
423{
424 ide_hwif_t *hwif = drive->hwif;
425 void __iomem *base = TX4939IDE_BASE(hwif);
426 u16 sysctl = hwif->select_data >> (drive->dn ? 16 : 0);
427
428
429
430
431
432
433
434 tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
435}
436
437static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf,
438 u8 valid)
439{
440 ide_tf_load(drive, tf, valid);
441
442 if (valid & IDE_VALID_DEVICE)
443 tx4939ide_tf_load_fixup(drive);
444}
445
446#ifdef __BIG_ENDIAN
447
448
449static void tx4939ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
450 void *buf, unsigned int len)
451{
452 unsigned long port = drive->hwif->io_ports.data_addr;
453 unsigned short *ptr = buf;
454 unsigned int count = (len + 1) / 2;
455
456 while (count--)
457 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
458 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
459}
460
461static void tx4939ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
462 void *buf, unsigned int len)
463{
464 unsigned long port = drive->hwif->io_ports.data_addr;
465 unsigned short *ptr = buf;
466 unsigned int count = (len + 1) / 2;
467
468 while (count--) {
469 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
470 ptr++;
471 }
472 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
473}
474
475static const struct ide_tp_ops tx4939ide_tp_ops = {
476 .exec_command = ide_exec_command,
477 .read_status = ide_read_status,
478 .read_altstatus = ide_read_altstatus,
479 .write_devctl = ide_write_devctl,
480
481 .dev_select = ide_dev_select,
482 .tf_load = tx4939ide_tf_load,
483 .tf_read = ide_tf_read,
484
485 .input_data = tx4939ide_input_data_swap,
486 .output_data = tx4939ide_output_data_swap,
487};
488
489#else
490
491static const struct ide_tp_ops tx4939ide_tp_ops = {
492 .exec_command = ide_exec_command,
493 .read_status = ide_read_status,
494 .read_altstatus = ide_read_altstatus,
495 .write_devctl = ide_write_devctl,
496
497 .dev_select = ide_dev_select,
498 .tf_load = tx4939ide_tf_load,
499 .tf_read = ide_tf_read,
500
501 .input_data = ide_input_data,
502 .output_data = ide_output_data,
503};
504
505#endif
506
507static const struct ide_port_ops tx4939ide_port_ops = {
508 .set_pio_mode = tx4939ide_set_pio_mode,
509 .set_dma_mode = tx4939ide_set_dma_mode,
510 .clear_irq = tx4939ide_clear_irq,
511 .cable_detect = tx4939ide_cable_detect,
512};
513
514static const struct ide_dma_ops tx4939ide_dma_ops = {
515 .dma_host_set = tx4939ide_dma_host_set,
516 .dma_setup = tx4939ide_dma_setup,
517 .dma_start = ide_dma_start,
518 .dma_end = tx4939ide_dma_end,
519 .dma_test_irq = tx4939ide_dma_test_irq,
520 .dma_lost_irq = ide_dma_lost_irq,
521 .dma_timer_expiry = ide_dma_sff_timer_expiry,
522 .dma_sff_read_status = tx4939ide_dma_sff_read_status,
523};
524
525static const struct ide_port_info tx4939ide_port_info __initconst = {
526 .init_hwif = tx4939ide_init_hwif,
527 .init_dma = tx4939ide_init_dma,
528 .port_ops = &tx4939ide_port_ops,
529 .dma_ops = &tx4939ide_dma_ops,
530 .tp_ops = &tx4939ide_tp_ops,
531 .host_flags = IDE_HFLAG_MMIO,
532 .pio_mask = ATA_PIO4,
533 .mwdma_mask = ATA_MWDMA2,
534 .udma_mask = ATA_UDMA5,
535 .chipset = ide_generic,
536};
537
538static int __init tx4939ide_probe(struct platform_device *pdev)
539{
540 struct ide_hw hw, *hws[] = { &hw };
541 struct ide_host *host;
542 struct resource *res;
543 int irq, ret;
544 unsigned long mapbase;
545
546 irq = platform_get_irq(pdev, 0);
547 if (irq < 0)
548 return -ENODEV;
549 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
550 if (!res)
551 return -ENODEV;
552
553 if (!devm_request_mem_region(&pdev->dev, res->start,
554 resource_size(res), "tx4938ide"))
555 return -EBUSY;
556 mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
557 resource_size(res));
558 if (!mapbase)
559 return -EBUSY;
560 memset(&hw, 0, sizeof(hw));
561 hw.io_ports.data_addr =
562 mapbase + tx4939ide_swizzlew(TX4939IDE_Data);
563 hw.io_ports.error_addr =
564 mapbase + tx4939ide_swizzleb(TX4939IDE_Error_Feature);
565 hw.io_ports.nsect_addr =
566 mapbase + tx4939ide_swizzleb(TX4939IDE_Sec);
567 hw.io_ports.lbal_addr =
568 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA0);
569 hw.io_ports.lbam_addr =
570 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA1);
571 hw.io_ports.lbah_addr =
572 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA2);
573 hw.io_ports.device_addr =
574 mapbase + tx4939ide_swizzleb(TX4939IDE_DevHead);
575 hw.io_ports.command_addr =
576 mapbase + tx4939ide_swizzleb(TX4939IDE_Stat_Cmd);
577 hw.io_ports.ctl_addr =
578 mapbase + tx4939ide_swizzleb(TX4939IDE_AltStat_DevCtl);
579 hw.irq = irq;
580 hw.dev = &pdev->dev;
581
582 pr_info("TX4939 IDE interface (base %#lx, irq %d)\n", mapbase, irq);
583 host = ide_host_alloc(&tx4939ide_port_info, hws, 1);
584 if (!host)
585 return -ENOMEM;
586
587 host->ports[0]->extra_base = mapbase;
588 ret = ide_host_register(host, &tx4939ide_port_info, hws);
589 if (ret) {
590 ide_host_free(host);
591 return ret;
592 }
593 platform_set_drvdata(pdev, host);
594 return 0;
595}
596
597static int __exit tx4939ide_remove(struct platform_device *pdev)
598{
599 struct ide_host *host = platform_get_drvdata(pdev);
600
601 ide_host_remove(host);
602 return 0;
603}
604
605#ifdef CONFIG_PM
606static int tx4939ide_resume(struct platform_device *dev)
607{
608 struct ide_host *host = platform_get_drvdata(dev);
609 ide_hwif_t *hwif = host->ports[0];
610
611 tx4939ide_init_hwif(hwif);
612 return 0;
613}
614#else
615#define tx4939ide_resume NULL
616#endif
617
618static struct platform_driver tx4939ide_driver = {
619 .driver = {
620 .name = MODNAME,
621 .owner = THIS_MODULE,
622 },
623 .remove = __exit_p(tx4939ide_remove),
624 .resume = tx4939ide_resume,
625};
626
627static int __init tx4939ide_init(void)
628{
629 return platform_driver_probe(&tx4939ide_driver, tx4939ide_probe);
630}
631
632static void __exit tx4939ide_exit(void)
633{
634 platform_driver_unregister(&tx4939ide_driver);
635}
636
637module_init(tx4939ide_init);
638module_exit(tx4939ide_exit);
639
640MODULE_DESCRIPTION("TX4939 internal IDE driver");
641MODULE_LICENSE("GPL");
642MODULE_ALIAS("platform:tx4939ide");
643
