2 * TX4939 internal IDE driver
3 * Based on RBTX49xx patch from CELF patch archive.
5 * This file is subject to the terms and conditions of the GNU General Public
6 * License. See the file "COPYING" in the main directory of this archive
9 * (C) Copyright TOSHIBA CORPORATION 2005-2007
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>
19 #include <linux/scatterlist.h>
23 #define MODNAME "tx4939ide"
25 /* ATA Shadow Registers (8-bit except for Data which is 16-bit) */
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 /* H/W DMA Registers */
36 #define TX4939IDE_DMA_Cmd 0x800 /* 8-bit */
37 #define TX4939IDE_DMA_Stat 0x802 /* 8-bit */
38 #define TX4939IDE_PRD_Ptr 0x804 /* 32-bit */
39 /* ATA100 CORE Registers (16-bit) */
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
59 /* bits for Int_Ctl */
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
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)
75 #define tx4939ide_swizzlel(a) ((a) ^ 4)
76 #define tx4939ide_swizzlew(a) ((a) ^ 6)
77 #define tx4939ide_swizzleb(a) ((a) ^ 7)
79 #define tx4939ide_swizzlel(a) (a)
80 #define tx4939ide_swizzlew(a) (a)
81 #define tx4939ide_swizzleb(a) (a)
84 static u16 tx4939ide_readw(void __iomem *base, u32 reg)
86 return __raw_readw(base + tx4939ide_swizzlew(reg));
88 static u8 tx4939ide_readb(void __iomem *base, u32 reg)
90 return __raw_readb(base + tx4939ide_swizzleb(reg));
92 static void tx4939ide_writel(u32 val, void __iomem *base, u32 reg)
94 __raw_writel(val, base + tx4939ide_swizzlel(reg));
96 static void tx4939ide_writew(u16 val, void __iomem *base, u32 reg)
98 __raw_writew(val, base + tx4939ide_swizzlew(reg));
100 static void tx4939ide_writeb(u8 val, void __iomem *base, u32 reg)
102 __raw_writeb(val, base + tx4939ide_swizzleb(reg));
105 #define TX4939IDE_BASE(hwif) ((void __iomem *)(hwif)->extra_base)
107 static void tx4939ide_set_pio_mode(ide_drive_t *drive, const u8 pio)
109 ide_hwif_t *hwif = drive->hwif;
110 int is_slave = drive->dn;
115 pair = ide_get_pair_dev(drive);
117 safe = min(safe, ide_get_best_pio_mode(pair, 255, 4));
119 * Update Command Transfer Mode for master/slave and Data
120 * Transfer Mode for this drive.
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 /* tx4939ide_tf_load_fixup() will set the Sys_Ctl register */
128 static void tx4939ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
130 ide_hwif_t *hwif = drive->hwif;
133 /* Update Data Transfer Mode for this drive. */
134 if (mode >= XFER_UDMA_0)
135 val = mode - XFER_UDMA_0 + 8;
137 val = mode - XFER_MW_DMA_0 + 5;
145 hwif->select_data = (hwif->select_data & ~mask) | val;
146 /* tx4939ide_tf_load_fixup() will set the Sys_Ctl register */
149 static u16 tx4939ide_check_error_ints(ide_hwif_t *hwif)
151 void __iomem *base = TX4939IDE_BASE(hwif);
152 u16 ctl = tx4939ide_readw(base, TX4939IDE_Int_Ctl);
154 if (ctl & TX4939IDE_INT_BUSERR) {
156 u16 sysctl = tx4939ide_readw(base, TX4939IDE_Sys_Ctl);
158 tx4939ide_writew(sysctl | 0x4000, base, TX4939IDE_Sys_Ctl);
160 /* wait 12GBUSCLK (typ. 60ns @ GBUS200MHz, max 270ns) */
162 tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
164 if (ctl & (TX4939IDE_INT_ADDRERR |
165 TX4939IDE_INT_DEVTIMING | TX4939IDE_INT_BUSERR))
166 pr_err("%s: Error interrupt %#x (%s%s%s )\n",
168 ctl & TX4939IDE_INT_ADDRERR ? " Address-Error" : "",
169 ctl & TX4939IDE_INT_DEVTIMING ? " DEV-Timing" : "",
170 ctl & TX4939IDE_INT_BUSERR ? " Bus-Error" : "");
174 static void tx4939ide_clear_irq(ide_drive_t *drive)
181 * tx4939ide_dma_test_irq() and tx4939ide_dma_end() do all job
184 if (drive->waiting_for_dma)
187 base = TX4939IDE_BASE(hwif);
188 ctl = tx4939ide_check_error_ints(hwif);
189 tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
192 static u8 tx4939ide_cable_detect(ide_hwif_t *hwif)
194 void __iomem *base = TX4939IDE_BASE(hwif);
196 return tx4939ide_readw(base, TX4939IDE_Sys_Ctl) & 0x2000 ?
197 ATA_CBL_PATA40 : ATA_CBL_PATA80;
201 static void tx4939ide_dma_host_set(ide_drive_t *drive, int on)
203 ide_hwif_t *hwif = drive->hwif;
205 void __iomem *base = TX4939IDE_BASE(hwif);
206 u8 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
209 dma_stat |= (1 << (5 + unit));
211 dma_stat &= ~(1 << (5 + unit));
213 tx4939ide_writeb(dma_stat, base, TX4939IDE_DMA_Stat);
216 #define tx4939ide_dma_host_set ide_dma_host_set
219 static u8 tx4939ide_clear_dma_status(void __iomem *base)
223 /* read DMA status for INTR & ERROR flags */
224 dma_stat = tx4939ide_readb(base, TX4939IDE_DMA_Stat);
225 /* clear INTR & ERROR flags */
226 tx4939ide_writeb(dma_stat | ATA_DMA_INTR | ATA_DMA_ERR, base,
228 /* recover intmask cleared by writing to bit2 of DMA_Stat */
229 tx4939ide_writew(TX4939IDE_IGNORE_INTS << 8, base, TX4939IDE_Int_Ctl);
234 /* custom ide_build_dmatable to handle swapped layout */
235 static int tx4939ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
237 ide_hwif_t *hwif = drive->hwif;
238 u32 *table = (u32 *)hwif->dmatable_cpu;
239 unsigned int count = 0;
241 struct scatterlist *sg;
243 for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
244 u32 cur_addr, cur_len, bcount;
246 cur_addr = sg_dma_address(sg);
247 cur_len = sg_dma_len(sg);
250 * Fill in the DMA table, without crossing any 64kB boundaries.
254 if (count++ >= PRD_ENTRIES)
255 goto use_pio_instead;
257 bcount = 0x10000 - (cur_addr & 0xffff);
258 if (bcount > cur_len)
261 * This workaround for zero count seems required.
262 * (standard ide_build_dmatable does it too)
264 if (bcount == 0x10000)
266 *table++ = bcount & 0xffff;
274 *(table - 2) |= 0x80000000;
279 printk(KERN_ERR "%s: %s\n", drive->name,
280 count ? "DMA table too small" : "empty DMA table?");
282 return 0; /* revert to PIO for this request */
285 #define tx4939ide_build_dmatable ide_build_dmatable
288 static int tx4939ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
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;
294 /* fall back to PIO! */
295 if (tx4939ide_build_dmatable(drive, cmd) == 0)
299 tx4939ide_writel(hwif->dmatable_dma, base, TX4939IDE_PRD_Ptr);
302 tx4939ide_writeb(rw, base, TX4939IDE_DMA_Cmd);
304 /* clear INTR & ERROR flags */
305 tx4939ide_clear_dma_status(base);
307 tx4939ide_writew(SECTOR_SIZE / 2, base, drive->dn ?
308 TX4939IDE_Xfer_Cnt_2 : TX4939IDE_Xfer_Cnt_1);
310 tx4939ide_writew(blk_rq_sectors(cmd->rq), base, TX4939IDE_Sec_Cnt);
315 static int tx4939ide_dma_end(ide_drive_t *drive)
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);
322 /* get DMA command mode */
323 dma_cmd = tx4939ide_readb(base, TX4939IDE_DMA_Cmd);
325 tx4939ide_writeb(dma_cmd & ~ATA_DMA_START, base, TX4939IDE_DMA_Cmd);
327 /* read and clear the INTR & ERROR bits */
328 dma_stat = tx4939ide_clear_dma_status(base);
330 #define CHECK_DMA_MASK (ATA_DMA_ACTIVE | ATA_DMA_ERR | ATA_DMA_INTR)
332 /* verify good DMA status */
333 if ((dma_stat & CHECK_DMA_MASK) == 0 &&
334 (ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST)) ==
335 (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST))
336 /* INT_IDE lost... bug? */
338 return ((dma_stat & CHECK_DMA_MASK) !=
339 ATA_DMA_INTR) ? 0x10 | dma_stat : 0;
342 /* returns 1 if DMA IRQ issued, 0 otherwise */
343 static int tx4939ide_dma_test_irq(ide_drive_t *drive)
345 ide_hwif_t *hwif = drive->hwif;
346 void __iomem *base = TX4939IDE_BASE(hwif);
351 ctl = tx4939ide_check_error_ints(hwif);
352 ide_int = ctl & (TX4939IDE_INT_XFEREND | TX4939IDE_INT_HOST);
354 case TX4939IDE_INT_HOST:
355 /* On error, XFEREND might not be asserted. */
356 stat = tx4939ide_readb(base, TX4939IDE_AltStat_DevCtl);
357 if ((stat & (ATA_BUSY | ATA_DRQ | ATA_ERR)) == ATA_ERR)
360 /* Wait for XFEREND (Mask HOST and unmask XFEREND) */
361 ctl &= ~TX4939IDE_INT_XFEREND << 8;
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);
374 * Do not clear XFEREND, HOST now. They will be cleared by
375 * clearing bit2 of DMA_Stat.
378 tx4939ide_writew(ctl, base, TX4939IDE_Int_Ctl);
383 static u8 tx4939ide_dma_sff_read_status(ide_hwif_t *hwif)
385 void __iomem *base = TX4939IDE_BASE(hwif);
387 return tx4939ide_readb(base, TX4939IDE_DMA_Stat);
390 #define tx4939ide_dma_sff_read_status ide_dma_sff_read_status
393 static void tx4939ide_init_hwif(ide_hwif_t *hwif)
395 void __iomem *base = TX4939IDE_BASE(hwif);
398 tx4939ide_writew(0x8000, base, TX4939IDE_Sys_Ctl);
400 /* at least 20 GBUSCLK (typ. 100ns @ GBUS200MHz, max 450ns) */
402 tx4939ide_writew(0x0000, base, TX4939IDE_Sys_Ctl);
403 /* mask some interrupts and clear all interrupts */
404 tx4939ide_writew((TX4939IDE_IGNORE_INTS << 8) | 0xff, base,
407 tx4939ide_writew(0x0008, base, TX4939IDE_Lo_Burst_Cnt);
408 tx4939ide_writew(0, base, TX4939IDE_Up_Burst_Cnt);
411 static int tx4939ide_init_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
414 hwif->extra_base + tx4939ide_swizzleb(TX4939IDE_DMA_Cmd);
416 * Note that we cannot use ATA_DMA_TABLE_OFS, ATA_DMA_STATUS
419 return ide_allocate_dma_engine(hwif);
422 static void tx4939ide_tf_load_fixup(ide_drive_t *drive)
424 ide_hwif_t *hwif = drive->hwif;
425 void __iomem *base = TX4939IDE_BASE(hwif);
426 u16 sysctl = hwif->select_data >> (drive->dn ? 16 : 0);
429 * Fix ATA100 CORE System Control Register. (The write to the
430 * Device/Head register may write wrong data to the System
432 * While Sys_Ctl is written here, dev_select() is not needed.
434 tx4939ide_writew(sysctl, base, TX4939IDE_Sys_Ctl);
437 static void tx4939ide_tf_load(ide_drive_t *drive, struct ide_taskfile *tf,
440 ide_tf_load(drive, tf, valid);
442 if (valid & IDE_VALID_DEVICE)
443 tx4939ide_tf_load_fixup(drive);
448 /* custom iops (independent from SWAP_IO_SPACE) */
449 static void tx4939ide_input_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
450 void *buf, unsigned int len)
452 unsigned long port = drive->hwif->io_ports.data_addr;
453 unsigned short *ptr = buf;
454 unsigned int count = (len + 1) / 2;
457 *ptr++ = cpu_to_le16(__raw_readw((void __iomem *)port));
458 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
461 static void tx4939ide_output_data_swap(ide_drive_t *drive, struct ide_cmd *cmd,
462 void *buf, unsigned int len)
464 unsigned long port = drive->hwif->io_ports.data_addr;
465 unsigned short *ptr = buf;
466 unsigned int count = (len + 1) / 2;
469 __raw_writew(le16_to_cpu(*ptr), (void __iomem *)port);
472 __ide_flush_dcache_range((unsigned long)buf, roundup(len, 2));
475 static 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,
481 .dev_select = ide_dev_select,
482 .tf_load = tx4939ide_tf_load,
483 .tf_read = ide_tf_read,
485 .input_data = tx4939ide_input_data_swap,
486 .output_data = tx4939ide_output_data_swap,
489 #else /* __LITTLE_ENDIAN */
491 static 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,
497 .dev_select = ide_dev_select,
498 .tf_load = tx4939ide_tf_load,
499 .tf_read = ide_tf_read,
501 .input_data = ide_input_data,
502 .output_data = ide_output_data,
505 #endif /* __LITTLE_ENDIAN */
507 static 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,
514 static 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,
525 static const struct ide_port_info tx4939ide_port_info __initdata = {
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,
538 static int __init tx4939ide_probe(struct platform_device *pdev)
541 hw_regs_t *hws[] = { &hw, NULL, NULL, NULL };
542 struct ide_host *host;
543 struct resource *res;
545 unsigned long mapbase;
547 irq = platform_get_irq(pdev, 0);
550 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
554 if (!devm_request_mem_region(&pdev->dev, res->start,
555 res->end - res->start + 1, "tx4938ide"))
557 mapbase = (unsigned long)devm_ioremap(&pdev->dev, res->start,
558 res->end - res->start + 1);
561 memset(&hw, 0, sizeof(hw));
562 hw.io_ports.data_addr =
563 mapbase + tx4939ide_swizzlew(TX4939IDE_Data);
564 hw.io_ports.error_addr =
565 mapbase + tx4939ide_swizzleb(TX4939IDE_Error_Feature);
566 hw.io_ports.nsect_addr =
567 mapbase + tx4939ide_swizzleb(TX4939IDE_Sec);
568 hw.io_ports.lbal_addr =
569 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA0);
570 hw.io_ports.lbam_addr =
571 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA1);
572 hw.io_ports.lbah_addr =
573 mapbase + tx4939ide_swizzleb(TX4939IDE_LBA2);
574 hw.io_ports.device_addr =
575 mapbase + tx4939ide_swizzleb(TX4939IDE_DevHead);
576 hw.io_ports.command_addr =
577 mapbase + tx4939ide_swizzleb(TX4939IDE_Stat_Cmd);
578 hw.io_ports.ctl_addr =
579 mapbase + tx4939ide_swizzleb(TX4939IDE_AltStat_DevCtl);
583 pr_info("TX4939 IDE interface (base %#lx, irq %d)\n", mapbase, irq);
584 host = ide_host_alloc(&tx4939ide_port_info, hws);
587 /* use extra_base for base address of the all registers */
588 host->ports[0]->extra_base = mapbase;
589 ret = ide_host_register(host, &tx4939ide_port_info, hws);
594 platform_set_drvdata(pdev, host);
598 static int __exit tx4939ide_remove(struct platform_device *pdev)
600 struct ide_host *host = platform_get_drvdata(pdev);
602 ide_host_remove(host);
607 static int tx4939ide_resume(struct platform_device *dev)
609 struct ide_host *host = platform_get_drvdata(dev);
610 ide_hwif_t *hwif = host->ports[0];
612 tx4939ide_init_hwif(hwif);
616 #define tx4939ide_resume NULL
619 static struct platform_driver tx4939ide_driver = {
622 .owner = THIS_MODULE,
624 .remove = __exit_p(tx4939ide_remove),
625 .resume = tx4939ide_resume,
628 static int __init tx4939ide_init(void)
630 return platform_driver_probe(&tx4939ide_driver, tx4939ide_probe);
633 static void __exit tx4939ide_exit(void)
635 platform_driver_unregister(&tx4939ide_driver);
638 module_init(tx4939ide_init);
639 module_exit(tx4939ide_exit);
641 MODULE_DESCRIPTION("TX4939 internal IDE driver");
642 MODULE_LICENSE("GPL");
643 MODULE_ALIAS("platform:tx4939ide");