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
27 * Most registers remain compatible across chips. Others start reserved
28 * and acquire sensible semantics if set to 1 (eg cable detect). A few
29 * exceptions exist, notably around the FIFO settings.
31 * One additional quirk of the VIA design is that like ALi they use few
32 * PCI IDs for a lot of chips.
38 * VIA IDE driver for Linux. Supported southbridges:
40 * vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
41 * vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
44 * Copyright (c) 2000-2002 Vojtech Pavlik
46 * Based on the work of:
53 #include <linux/kernel.h>
54 #include <linux/module.h>
55 #include <linux/pci.h>
56 #include <linux/init.h>
57 #include <linux/blkdev.h>
58 #include <linux/delay.h>
59 #include <scsi/scsi_host.h>
60 #include <linux/libata.h>
62 #define DRV_NAME "pata_via"
63 #define DRV_VERSION "0.1.14"
66 * The following comes directly from Vojtech Pavlik's ide/pci/via82cxxx
72 VIA_UDMA_NONE = 0x000,
77 VIA_BAD_PREQ = 0x010, /* Crashes if PREQ# till DDACK# set */
78 VIA_BAD_CLK66 = 0x020, /* 66 MHz clock doesn't work correctly */
79 VIA_SET_FIFO = 0x040, /* Needs to have FIFO split set */
80 VIA_NO_UNMASK = 0x080, /* Doesn't work with IRQ unmasking on */
81 VIA_BAD_ID = 0x100, /* Has wrong vendor ID (0x1107) */
82 VIA_BAD_AST = 0x200, /* Don't touch Address Setup Timing */
83 VIA_NO_ENABLES = 0x400, /* Has no enablebits */
87 * VIA SouthBridge chips.
90 static const struct via_isa_bridge {
96 } via_isa_bridges[] = {
97 { "cx700", PCI_DEVICE_ID_VIA_CX700, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
98 { "vt6410", PCI_DEVICE_ID_VIA_6410, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST | VIA_NO_ENABLES},
99 { "vt8237a", PCI_DEVICE_ID_VIA_8237A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
100 { "vt8237", PCI_DEVICE_ID_VIA_8237, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
101 { "vt8235", PCI_DEVICE_ID_VIA_8235, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
102 { "vt8233a", PCI_DEVICE_ID_VIA_8233A, 0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
103 { "vt8233c", PCI_DEVICE_ID_VIA_8233C_0, 0x00, 0x2f, VIA_UDMA_100 },
104 { "vt8233", PCI_DEVICE_ID_VIA_8233_0, 0x00, 0x2f, VIA_UDMA_100 },
105 { "vt8231", PCI_DEVICE_ID_VIA_8231, 0x00, 0x2f, VIA_UDMA_100 },
106 { "vt82c686b", PCI_DEVICE_ID_VIA_82C686, 0x40, 0x4f, VIA_UDMA_100 },
107 { "vt82c686a", PCI_DEVICE_ID_VIA_82C686, 0x10, 0x2f, VIA_UDMA_66 },
108 { "vt82c686", PCI_DEVICE_ID_VIA_82C686, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
109 { "vt82c596b", PCI_DEVICE_ID_VIA_82C596, 0x10, 0x2f, VIA_UDMA_66 },
110 { "vt82c596a", PCI_DEVICE_ID_VIA_82C596, 0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
111 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
112 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
113 { "vt82c586b", PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
114 { "vt82c586a", PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
115 { "vt82c586", PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
116 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
117 { "vt82c576", PCI_DEVICE_ID_VIA_82C576, 0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
122 * via_cable_detect - cable detection
125 * Perform cable detection. Actually for the VIA case the BIOS
126 * already did this for us. We read the values provided by the
127 * BIOS. If you are using an 8235 in a non-PC configuration you
128 * may need to update this code.
130 * Hotplug also impacts on this.
133 static int via_cable_detect(struct ata_port *ap) {
134 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
137 pci_read_config_dword(pdev, 0x50, &ata66);
138 /* Check both the drive cable reporting bits, we might not have
140 if (ata66 & (0x10100000 >> (16 * ap->port_no)))
141 return ATA_CBL_PATA80;
143 return ATA_CBL_PATA40;
146 static int via_pre_reset(struct ata_port *ap)
148 const struct via_isa_bridge *config = ap->host->private_data;
150 if (!(config->flags & VIA_NO_ENABLES)) {
151 static const struct pci_bits via_enable_bits[] = {
152 { 0x40, 1, 0x02, 0x02 },
153 { 0x40, 1, 0x01, 0x01 }
156 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
158 if (!pci_test_config_bits(pdev, &via_enable_bits[ap->port_no]))
162 if ((config->flags & VIA_UDMA) >= VIA_UDMA_66)
163 ap->cbl = via_cable_detect(ap);
165 ap->cbl = ATA_CBL_PATA40;
166 return ata_std_prereset(ap);
171 * via_error_handler - reset for VIA chips
174 * Handle the reset callback for the later chips with cable detect
177 static void via_error_handler(struct ata_port *ap)
179 ata_bmdma_drive_eh(ap, via_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
183 * via_do_set_mode - set initial PIO mode data
186 * @mode: ATA mode being programmed
187 * @tdiv: Clocks per PCI clock
188 * @set_ast: Set to program address setup
189 * @udma_type: UDMA mode/format of registers
191 * Program the VIA registers for DMA and PIO modes. Uses the ata timing
192 * support in order to compute modes.
194 * FIXME: Hotplug will require we serialize multiple mode changes
195 * on the two channels.
198 static void via_do_set_mode(struct ata_port *ap, struct ata_device *adev, int mode, int tdiv, int set_ast, int udma_type)
200 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
201 struct ata_device *peer = ata_dev_pair(adev);
202 struct ata_timing t, p;
203 static int via_clock = 33333; /* Bus clock in kHZ - ought to be tunable one day */
204 unsigned long T = 1000000000 / via_clock;
205 unsigned long UT = T/tdiv;
207 int offset = 3 - (2*ap->port_no) - adev->devno;
210 /* Calculate the timing values we require */
211 ata_timing_compute(adev, mode, &t, T, UT);
213 /* We share 8bit timing so we must merge the constraints */
215 if (peer->pio_mode) {
216 ata_timing_compute(peer, peer->pio_mode, &p, T, UT);
217 ata_timing_merge(&p, &t, &t, ATA_TIMING_8BIT);
221 /* Address setup is programmable but breaks on UDMA133 setups */
223 u8 setup; /* 2 bits per drive */
224 int shift = 2 * offset;
226 pci_read_config_byte(pdev, 0x4C, &setup);
227 setup &= ~(3 << shift);
228 setup |= FIT(t.setup, 1, 4) << shift; /* 1,4 or 1,4 - 1 FIXME */
229 pci_write_config_byte(pdev, 0x4C, setup);
232 /* Load the PIO mode bits */
233 pci_write_config_byte(pdev, 0x4F - ap->port_no,
234 ((FIT(t.act8b, 1, 16) - 1) << 4) | (FIT(t.rec8b, 1, 16) - 1));
235 pci_write_config_byte(pdev, 0x48 + offset,
236 ((FIT(t.active, 1, 16) - 1) << 4) | (FIT(t.recover, 1, 16) - 1));
238 /* Load the UDMA bits according to type */
244 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 5) - 2)) : 0x03;
247 ut = t.udma ? (0xe8 | (FIT(t.udma, 2, 9) - 2)) : 0x0f;
250 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
253 ut = t.udma ? (0xe0 | (FIT(t.udma, 2, 9) - 2)) : 0x07;
256 /* Set UDMA unless device is not UDMA capable */
258 pci_write_config_byte(pdev, 0x50 + offset, ut);
261 static void via_set_piomode(struct ata_port *ap, struct ata_device *adev)
263 const struct via_isa_bridge *config = ap->host->private_data;
264 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
265 int mode = config->flags & VIA_UDMA;
266 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
267 static u8 udma[5] = { 0, 33, 66, 100, 133 };
269 via_do_set_mode(ap, adev, adev->pio_mode, tclock[mode], set_ast, udma[mode]);
272 static void via_set_dmamode(struct ata_port *ap, struct ata_device *adev)
274 const struct via_isa_bridge *config = ap->host->private_data;
275 int set_ast = (config->flags & VIA_BAD_AST) ? 0 : 1;
276 int mode = config->flags & VIA_UDMA;
277 static u8 tclock[5] = { 1, 1, 2, 3, 4 };
278 static u8 udma[5] = { 0, 33, 66, 100, 133 };
280 via_do_set_mode(ap, adev, adev->dma_mode, tclock[mode], set_ast, udma[mode]);
283 static struct scsi_host_template via_sht = {
284 .module = THIS_MODULE,
286 .ioctl = ata_scsi_ioctl,
287 .queuecommand = ata_scsi_queuecmd,
288 .can_queue = ATA_DEF_QUEUE,
289 .this_id = ATA_SHT_THIS_ID,
290 .sg_tablesize = LIBATA_MAX_PRD,
291 .max_sectors = ATA_MAX_SECTORS,
292 .cmd_per_lun = ATA_SHT_CMD_PER_LUN,
293 .emulated = ATA_SHT_EMULATED,
294 .use_clustering = ATA_SHT_USE_CLUSTERING,
295 .proc_name = DRV_NAME,
296 .dma_boundary = ATA_DMA_BOUNDARY,
297 .slave_configure = ata_scsi_slave_config,
298 .bios_param = ata_std_bios_param,
301 static struct ata_port_operations via_port_ops = {
302 .port_disable = ata_port_disable,
303 .set_piomode = via_set_piomode,
304 .set_dmamode = via_set_dmamode,
305 .mode_filter = ata_pci_default_filter,
307 .tf_load = ata_tf_load,
308 .tf_read = ata_tf_read,
309 .check_status = ata_check_status,
310 .exec_command = ata_exec_command,
311 .dev_select = ata_std_dev_select,
313 .freeze = ata_bmdma_freeze,
314 .thaw = ata_bmdma_thaw,
315 .error_handler = via_error_handler,
316 .post_internal_cmd = ata_bmdma_post_internal_cmd,
318 .bmdma_setup = ata_bmdma_setup,
319 .bmdma_start = ata_bmdma_start,
320 .bmdma_stop = ata_bmdma_stop,
321 .bmdma_status = ata_bmdma_status,
323 .qc_prep = ata_qc_prep,
324 .qc_issue = ata_qc_issue_prot,
326 .data_xfer = ata_pio_data_xfer,
328 .irq_handler = ata_interrupt,
329 .irq_clear = ata_bmdma_irq_clear,
331 .port_start = ata_port_start,
332 .port_stop = ata_port_stop,
333 .host_stop = ata_host_stop
336 static struct ata_port_operations via_port_ops_noirq = {
337 .port_disable = ata_port_disable,
338 .set_piomode = via_set_piomode,
339 .set_dmamode = via_set_dmamode,
340 .mode_filter = ata_pci_default_filter,
342 .tf_load = ata_tf_load,
343 .tf_read = ata_tf_read,
344 .check_status = ata_check_status,
345 .exec_command = ata_exec_command,
346 .dev_select = ata_std_dev_select,
348 .freeze = ata_bmdma_freeze,
349 .thaw = ata_bmdma_thaw,
350 .error_handler = via_error_handler,
351 .post_internal_cmd = ata_bmdma_post_internal_cmd,
353 .bmdma_setup = ata_bmdma_setup,
354 .bmdma_start = ata_bmdma_start,
355 .bmdma_stop = ata_bmdma_stop,
356 .bmdma_status = ata_bmdma_status,
358 .qc_prep = ata_qc_prep,
359 .qc_issue = ata_qc_issue_prot,
361 .data_xfer = ata_pio_data_xfer_noirq,
363 .irq_handler = ata_interrupt,
364 .irq_clear = ata_bmdma_irq_clear,
366 .port_start = ata_port_start,
367 .port_stop = ata_port_stop,
368 .host_stop = ata_host_stop
372 * via_init_one - discovery callback
373 * @pdev: PCI device ID
374 * @id: PCI table info
376 * A VIA IDE interface has been discovered. Figure out what revision
377 * and perform configuration work before handing it to the ATA layer
380 static int via_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
382 /* Early VIA without UDMA support */
383 static struct ata_port_info via_mwdma_info = {
385 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
388 .port_ops = &via_port_ops
390 /* Ditto with IRQ masking required */
391 static struct ata_port_info via_mwdma_info_borked = {
393 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
396 .port_ops = &via_port_ops_noirq,
398 /* VIA UDMA 33 devices (and borked 66) */
399 static struct ata_port_info via_udma33_info = {
401 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
405 .port_ops = &via_port_ops
407 /* VIA UDMA 66 devices */
408 static struct ata_port_info via_udma66_info = {
410 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
414 .port_ops = &via_port_ops
416 /* VIA UDMA 100 devices */
417 static struct ata_port_info via_udma100_info = {
419 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
423 .port_ops = &via_port_ops
425 /* UDMA133 with bad AST (All current 133) */
426 static struct ata_port_info via_udma133_info = {
428 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
431 .udma_mask = 0x7f, /* FIXME: should check north bridge */
432 .port_ops = &via_port_ops
434 struct ata_port_info *port_info[2], *type;
435 struct pci_dev *isa = NULL;
436 const struct via_isa_bridge *config;
437 static int printed_version;
442 if (!printed_version++)
443 dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
445 /* To find out how the IDE will behave and what features we
446 actually have to look at the bridge not the IDE controller */
447 for (config = via_isa_bridges; config->id; config++)
448 if ((isa = pci_get_device(PCI_VENDOR_ID_VIA +
449 !!(config->flags & VIA_BAD_ID),
450 config->id, NULL))) {
452 pci_read_config_byte(isa, PCI_REVISION_ID, &t);
453 if (t >= config->rev_min &&
454 t <= config->rev_max)
460 printk(KERN_WARNING "via: Unknown VIA SouthBridge, disabling.\n");
465 /* 0x40 low bits indicate enabled channels */
466 pci_read_config_byte(pdev, 0x40 , &enable);
472 /* Initialise the FIFO for the enabled channels. */
473 if (config->flags & VIA_SET_FIFO) {
474 u8 fifo_setting[4] = {0x00, 0x60, 0x00, 0x20};
477 pci_read_config_byte(pdev, 0x43, &fifo);
479 /* Clear PREQ# until DDACK# for errata */
480 if (config->flags & VIA_BAD_PREQ)
484 /* Turn on FIFO for enabled channels */
485 fifo |= fifo_setting[enable];
486 pci_write_config_byte(pdev, 0x43, fifo);
489 switch(config->flags & VIA_UDMA) {
491 if (config->flags & VIA_NO_UNMASK)
492 type = &via_mwdma_info_borked;
494 type = &via_mwdma_info;
497 type = &via_udma33_info;
500 type = &via_udma66_info;
501 /* The 66 MHz devices require we enable the clock */
502 pci_read_config_dword(pdev, 0x50, &timing);
504 pci_write_config_dword(pdev, 0x50, timing);
507 type = &via_udma100_info;
510 type = &via_udma133_info;
517 if (config->flags & VIA_BAD_CLK66) {
518 /* Disable the 66MHz clock on problem devices */
519 pci_read_config_dword(pdev, 0x50, &timing);
521 pci_write_config_dword(pdev, 0x50, timing);
524 /* We have established the device type, now fire it up */
525 type->private_data = (void *)config;
527 port_info[0] = port_info[1] = type;
528 return ata_pci_init_one(pdev, port_info, 2);
531 static const struct pci_device_id via[] = {
532 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C576_1), },
533 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_82C586_1), },
534 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_6410), },
535 { PCI_VDEVICE(VIA, PCI_DEVICE_ID_VIA_SATA_EIDE), },
540 static struct pci_driver via_pci_driver = {
543 .probe = via_init_one,
544 .remove = ata_pci_remove_one
547 static int __init via_init(void)
549 return pci_register_driver(&via_pci_driver);
552 static void __exit via_exit(void)
554 pci_unregister_driver(&via_pci_driver);
557 MODULE_AUTHOR("Alan Cox");
558 MODULE_DESCRIPTION("low-level driver for VIA PATA");
559 MODULE_LICENSE("GPL");
560 MODULE_DEVICE_TABLE(pci, via);
561 MODULE_VERSION(DRV_VERSION);
563 module_init(via_init);
564 module_exit(via_exit);