2 * pata_via.c - VIA PATA for new ATA layer
3 * (C) 2005-2006 Red Hat Inc
4 * Alan Cox <alan@redhat.com>
7 * Most chipset documentation available under NDA only
10 * VIA VT82C561 - early design, uses ata_generic currently
11 * VIA VT82C576 - MWDMA, 33Mhz
12 * VIA VT82C586 - MWDMA, 33Mhz
13 * VIA VT82C586a - Added UDMA to 33Mhz
14 * VIA VT82C586b - UDMA33
15 * VIA VT82C596a - Nonfunctional UDMA66
16 * VIA VT82C596b - Working UDMA66
17 * VIA VT82C686 - Nonfunctional UDMA66
18 * VIA VT82C686a - Working UDMA66
19 * VIA VT82C686b - Updated to UDMA100
20 * VIA VT8231 - UDMA100
21 * VIA VT8233 - UDMA100
22 * VIA VT8233a - UDMA133
23 * VIA VT8233c - UDMA100
24 * VIA VT8235 - UDMA133
25 * VIA VT8237 - UDMA133
26 * VIA VT8251 - UDMA133
28 * Most registers remain compatible across chips. Others start reserved
29 * and acquire sensible semantics if set to 1 (eg cable detect). A few
30 * exceptions exist, notably around the FIFO settings.
32 * One additional quirk of the VIA design is that like ALi they use few
33 * PCI IDs for a lot of chips.
39 * VIA IDE driver for Linux. Supported southbridges:
41 * vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
42 * vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
45 * Copyright (c) 2000-2002 Vojtech Pavlik
47 * Based on the work of:
54 #include <linux/kernel.h>
55 #include <linux/module.h>
56 #include <linux/pci.h>
57 #include <linux/init.h>
58 #include <linux/blkdev.h>
59 #include <linux/delay.h>
60 #include <scsi/scsi_host.h>
61 #include <linux/libata.h>
63 #define DRV_NAME "pata_via"
64 #define DRV_VERSION "0.2.0"
67 * The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
73 VIA_UDMA_NONE = 0x000,
78 VIA_BAD_PREQ = 0x010, /* Crashes if PREQ# till DDACK# set */
79 VIA_BAD_CLK66 = 0x020, /* 66 MHz clock doesn't work correctly */
80 VIA_SET_FIFO = 0x040, /* Needs to have FIFO split set */
81 VIA_NO_UNMASK = 0x080, /* Doesn't work with IRQ unmasking on */
82 VIA_BAD_ID = 0x100, /* Has wrong vendor ID (0x1107) */
83 VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */
84 VIA_NO_ENABLES = 0x400, /* Has no enablebits */
88 * VIA SouthBridge chips.
91 static const struct via_isa_bridge {
97 } via_isa_bridges[] = {
98 { "vt8251", PCI_DEVICE_ID_VIA_8251, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
99 { "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
100 { "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
101 { "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
102 { "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
103 { "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
104 { "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
105 { "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 },
106 { "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 },
107 { "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 },
108 { "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 },
109 { "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 },
110 { "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
111 { "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 },
112 { "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
113 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
114 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
115 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
116 { "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
117 { "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
118 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
119 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
124 * via_cable_detect - cable detection
127 * Perform cable detection. Actually for the VIA case the BIOS
128 * already did this for us. We read the values provided by the
129 * BIOS. If you are using an 8235 in a non-PC configuration you
130 * may need to update this code.
132 * Hotplug also impacts on this.
135 static int via_cable_detect(struct ata_port *ap) {
136 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
139 pci_read_config_dword(pdev, 0x50, &ata66);
140 /* Check both the drive cable reporting bits, we might not have
142 if (ata66 & (0x10100000 >> (16 * ap->port_no)))
143 return ATA_CBL_PATA80;
145 return ATA_CBL_PATA40;
148 static int via_pre_reset(struct ata_port *ap)
150 const struct via_isa_bridge *config = ap->host->private_data;
152 if (!(config->flags & VIA_NO_ENABLES)) {
153 static const struct pci_bits via_enable_bits[] = {
154 { 0x40, 1, 0x02, 0x02 },
155 { 0x40, 1, 0x01, 0x01 }
158 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
160 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
164 if ((config->flags & VIA_UDMA) >= VIA_UDMA_100)
165 ap->cbl = via_cable_detect(ap);
166 /* The UDMA66 series has no cable detect so do drive side detect */
167 else if ((config->flags & VIA_UDMA) < VIA_UDMA_66)
168 ap->cbl = ATA_CBL_PATA40;
170 ap->cbl = ATA_CBL_PATA_UNK;
173 return ata_std_prereset(ap);
178 * via_error_handler - reset for VIA chips
181 * Handle the reset callback for the later chips with cable detect
184 static void via_error_handler(struct ata_port *ap)
186 ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
190 * via_do_set_mode - set initial PIO mode data
193 * @mode: ATA mode being programmed
194 * @tdiv: Clocks per PCI clock
195 * @set_ast: Set to program address setup
196 * @udma_type: UDMA mode/format of registers
198 * Program the VIA registers for DMA and PIO modes. Uses the ata timing
199 * support in order to compute modes.
201 * FIXME: Hotplug will require we serialize multiple mode changes
202 * on the two channels.
205 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
207 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
208 struct ata_device *peer = ata_dev_pair(adev);
209 struct ata_timing t, p;
210 static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */
211 unsigned long T = 1000000000 / via_clock;
212 unsigned long UT = T/tdiv;
214 int offset = 3 - (2*ap->port_no) - adev->devno;
217 /* Calculate the timing values we require */
218 ata_timing_compute(adev, mode, &t, T, UT);
220 /* We share 8bit timing so we must merge the constraints */
222 if (peer->pio_mode) {
223 ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
224 ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
228 /* Address setup is programmable but breaks on UDMA133 setups */
230 u8 setup; /* 2 bits per drive */
231 int shift = 2 * offset;
233 pci_read_config_byte(pdev, 0x4C, &setup);
234 setup &= ~(3 << shift);
235 setup |= FIT(t.setup, 1, 4) << shift; /* 1,4 or 1,4 - 1 FIXME */
236 pci_write_config_byte(pdev, 0x4C, setup);
239 /* Load the PIO mode bits */
240 pci_write_config_byte(pdev, 0x4F - ap->port_no,
241 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
242 pci_write_config_byte(pdev, 0x48 + offset,
243 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
245 /* Load the UDMA bits according to type */
251 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
254 ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
257 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
260 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
263 /* Set UDMA unless device is not UDMA capable */
265 pci_write_config_byte(pdev, 0x50 + offset, ut);
268 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
270 const struct via_isa_bridge *config = ap->host->private_data;
271 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
272 int mode = config->flags & VIA_UDMA;
273 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
274 static u8 udma[5] = { 0, 33, 66, 100, 133 };
276 via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
279 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
281 const struct via_isa_bridge *config = ap->host->private_data;
282 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
283 int mode = config->flags & VIA_UDMA;
284 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
285 static u8 udma[5] = { 0, 33, 66, 100, 133 };
287 via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
290 static struct scsi_host_template via_sht = {
291 .module = THIS_MODULE,
293 .ioctl = ata_scsi_ioctl,
294 .queuecommand = ata_scsi_queuecmd,
295 .can_queue = ATA_DEF_QUEUE,
296 .this_id = ATA_SHT_THIS_ID,
297 .sg_tablesize = LIBATA_MAX_PRD,
298 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
299 .emulated = ATA_SHT_EMULATED,
300 .use_clustering = ATA_SHT_USE_CLUSTERING,
301 .proc_name = DRV_NAME,
302 .dma_boundary = ATA_DMA_BOUNDARY,
303 .slave_configure = ata_scsi_slave_config,
304 .slave_destroy = ata_scsi_slave_destroy,
305 .bios_param = ata_std_bios_param,
306 .resume = ata_scsi_device_resume,
307 .suspend = ata_scsi_device_suspend,
310 static struct ata_port_operations via_port_ops = {
311 .port_disable = ata_port_disable,
312 .set_piomode = via_set_piomode,
313 .set_dmamode = via_set_dmamode,
314 .mode_filter = ata_pci_default_filter,
316 .tf_load = ata_tf_load,
317 .tf_read = ata_tf_read,
318 .check_status = ata_check_status,
319 .exec_command = ata_exec_command,
320 .dev_select = ata_std_dev_select,
322 .freeze = ata_bmdma_freeze,
323 .thaw = ata_bmdma_thaw,
324 .error_handler = via_error_handler,
325 .post_internal_cmd = ata_bmdma_post_internal_cmd,
327 .bmdma_setup = ata_bmdma_setup,
328 .bmdma_start = ata_bmdma_start,
329 .bmdma_stop = ata_bmdma_stop,
330 .bmdma_status = ata_bmdma_status,
332 .qc_prep = ata_qc_prep,
333 .qc_issue = ata_qc_issue_prot,
335 .data_xfer = ata_pio_data_xfer,
337 .irq_handler = ata_interrupt,
338 .irq_clear = ata_bmdma_irq_clear,
340 .port_start = ata_port_start,
341 .port_stop = ata_port_stop,
342 .host_stop = ata_host_stop
345 static struct ata_port_operations via_port_ops_noirq = {
346 .port_disable = ata_port_disable,
347 .set_piomode = via_set_piomode,
348 .set_dmamode = via_set_dmamode,
349 .mode_filter = ata_pci_default_filter,
351 .tf_load = ata_tf_load,
352 .tf_read = ata_tf_read,
353 .check_status = ata_check_status,
354 .exec_command = ata_exec_command,
355 .dev_select = ata_std_dev_select,
357 .freeze = ata_bmdma_freeze,
358 .thaw = ata_bmdma_thaw,
359 .error_handler = via_error_handler,
360 .post_internal_cmd = ata_bmdma_post_internal_cmd,
362 .bmdma_setup = ata_bmdma_setup,
363 .bmdma_start = ata_bmdma_start,
364 .bmdma_stop = ata_bmdma_stop,
365 .bmdma_status = ata_bmdma_status,
367 .qc_prep = ata_qc_prep,
368 .qc_issue = ata_qc_issue_prot,
370 .data_xfer = ata_pio_data_xfer_noirq,
372 .irq_handler = ata_interrupt,
373 .irq_clear = ata_bmdma_irq_clear,
375 .port_start = ata_port_start,
376 .port_stop = ata_port_stop,
377 .host_stop = ata_host_stop
381 * via_config_fifo - set up the FIFO
383 * @flags: configuration flags
385 * Set the FIFO properties for this device if neccessary. Used both on
386 * set up and on and the resume path
389 static void via_config_fifo(struct pci_dev *pdev, unsigned int flags)
393 /* 0x40 low bits indicate enabled channels */
394 pci_read_config_byte(pdev, 0x40 , &enable);
397 if (flags & VIA_SET_FIFO) {
398 u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
401 pci_read_config_byte(pdev, 0x43, &fifo);
403 /* Clear PREQ# until DDACK# for errata */
404 if (flags & VIA_BAD_PREQ)
408 /* Turn on FIFO for enabled channels */
409 fifo |= fifo_setting[enable];
410 pci_write_config_byte(pdev, 0x43, fifo);
415 * via_init_one - discovery callback
417 * @id: PCI table info
419 * A VIA IDE interface has been discovered. Figure out what revision
420 * and perform configuration work before handing it to the ATA layer
423 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
425 /* Early VIA without UDMA support */
426 static struct ata_port_info via_mwdma_info = {
428 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
431 .port_ops = &via_port_ops
433 /* Ditto with IRQ masking required */
434 static struct ata_port_info via_mwdma_info_borked = {
436 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
439 .port_ops = &via_port_ops_noirq,
441 /* VIA UDMA 33 devices (and borked 66) */
442 static struct ata_port_info via_udma33_info = {
444 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
448 .port_ops = &via_port_ops
450 /* VIA UDMA 66 devices */
451 static struct ata_port_info via_udma66_info = {
453 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
457 .port_ops = &via_port_ops
459 /* VIA UDMA 100 devices */
460 static struct ata_port_info via_udma100_info = {
462 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
466 .port_ops = &via_port_ops
468 /* UDMA133 with bad AST (All current 133) */
469 static struct ata_port_info via_udma133_info = {
471 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SETXFER_POLLING,
474 .udma_mask = 0x7f, /* FIXME: should check north bridge */
475 .port_ops = &via_port_ops
477 struct ata_port_info *port_info[2], *type;
478 struct pci_dev *isa = NULL;
479 const struct via_isa_bridge *config;
480 static int printed_version;
485 if (!printed_version++)
486 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
488 /* To find out how the IDE will behave and what features we
489 actually have to look at the bridge not the IDE controller */
490 for (config = via_isa_bridges; config->id; config++)
491 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
492 !!(config->flags & VIA_BAD_ID),
493 config->id, NULL))) {
495 pci_read_config_byte(isa, PCI_REVISION_ID, &t);
496 if (t >= config->rev_min &&
497 t <= config->rev_max)
503 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
508 /* 0x40 low bits indicate enabled channels */
509 pci_read_config_byte(pdev, 0x40 , &enable);
515 /* Initialise the FIFO for the enabled channels. */
516 via_config_fifo(pdev, config->flags);
519 switch(config->flags & VIA_UDMA) {
521 if (config->flags & VIA_NO_UNMASK)
522 type = &via_mwdma_info_borked;
524 type = &via_mwdma_info;
527 type = &via_udma33_info;
530 type = &via_udma66_info;
531 /* The 66 MHz devices require we enable the clock */
532 pci_read_config_dword(pdev, 0x50, &timing);
534 pci_write_config_dword(pdev, 0x50, timing);
537 type = &via_udma100_info;
540 type = &via_udma133_info;
547 if (config->flags & VIA_BAD_CLK66) {
548 /* Disable the 66MHz clock on problem devices */
549 pci_read_config_dword(pdev, 0x50, &timing);
551 pci_write_config_dword(pdev, 0x50, timing);
554 /* We have established the device type, now fire it up */
555 type->private_data = (void *)config;
557 port_info[0] = port_info[1] = type;
558 return ata_pci_init_one(pdev, port_info, 2);
562 * via_reinit_one - reinit after resume
565 * Called when the VIA PATA device is resumed. We must then
566 * reconfigure the fifo and other setup we may have altered. In
567 * addition the kernel needs to have the resume methods on PCI
571 static int via_reinit_one(struct pci_dev *pdev)
574 struct ata_host *host = dev_get_drvdata(&pdev->dev);
575 const struct via_isa_bridge *config = host->private_data;
577 via_config_fifo(pdev, config->flags);
579 if ((config->flags & VIA_UDMA) == VIA_UDMA_66) {
580 /* The 66 MHz devices require we enable the clock */
581 pci_read_config_dword(pdev, 0x50, &timing);
583 pci_write_config_dword(pdev, 0x50, timing);
585 if (config->flags & VIA_BAD_CLK66) {
586 /* Disable the 66MHz clock on problem devices */
587 pci_read_config_dword(pdev, 0x50, &timing);
589 pci_write_config_dword(pdev, 0x50, timing);
591 return ata_pci_device_resume(pdev);
594 static const struct pci_device_id via[] = {
595 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), },
596 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), },
597 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), },
598 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), },
603 static struct pci_driver via_pci_driver = {
606 .probe = via_init_one,
607 .remove = ata_pci_remove_one,
608 .suspend = ata_pci_device_suspend,
609 .resume = via_reinit_one,
612 static int __init via_init(void)
614 return pci_register_driver(&via_pci_driver);
617 static void __exit via_exit(void)
619 pci_unregister_driver(&via_pci_driver);
622 MODULE_AUTHOR("Alan Cox");
623 MODULE_DESCRIPTION("low-level driver for VIA PATA");
624 MODULE_LICENSE("GPL");
625 MODULE_DEVICE_TABLE(pci, via);
626 MODULE_VERSION(DRV_VERSION);
628 module_init(via_init);
629 module_exit(via_exit);