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_66
)
165 ap
->cbl
= via_cable_detect(ap
);
167 ap
->cbl
= ATA_CBL_PATA40
;
168 return ata_std_prereset(ap
);
173 * via_error_handler - reset for VIA chips
176 * Handle the reset callback for the later chips with cable detect
179 static void via_error_handler(struct ata_port
*ap
)
181 ata_bmdma_drive_eh(ap
, via_pre_reset
, ata_std_softreset
, NULL
, ata_std_postreset
);
185 * via_do_set_mode - set initial PIO mode data
188 * @mode: ATA mode being programmed
189 * @tdiv: Clocks per PCI clock
190 * @set_ast: Set to program address setup
191 * @udma_type: UDMA mode/format of registers
193 * Program the VIA registers for DMA and PIO modes. Uses the ata timing
194 * support in order to compute modes.
196 * FIXME: Hotplug will require we serialize multiple mode changes
197 * on the two channels.
200 static void via_do_set_mode(struct ata_port
*ap
, struct ata_device
*adev
, int mode
, int tdiv
, int set_ast
, int udma_type
)
202 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
203 struct ata_device
*peer
= ata_dev_pair(adev
);
204 struct ata_timing t
, p
;
205 static int via_clock
= 33333; /* Bus clock in kHZ - ought to be tunable one day */
206 unsigned long T
= 1000000000 / via_clock
;
207 unsigned long UT
= T
/tdiv
;
209 int offset
= 3 - (2*ap
->port_no
) - adev
->devno
;
212 /* Calculate the timing values we require */
213 ata_timing_compute(adev
, mode
, &t
, T
, UT
);
215 /* We share 8bit timing so we must merge the constraints */
217 if (peer
->pio_mode
) {
218 ata_timing_compute(peer
, peer
->pio_mode
, &p
, T
, UT
);
219 ata_timing_merge(&p
, &t
, &t
, ATA_TIMING_8BIT
);
223 /* Address setup is programmable but breaks on UDMA133 setups */
225 u8 setup
; /* 2 bits per drive */
226 int shift
= 2 * offset
;
228 pci_read_config_byte(pdev
, 0x4C, &setup
);
229 setup
&= ~(3 << shift
);
230 setup
|= FIT(t
.setup
, 1, 4) << shift
; /* 1,4 or 1,4 - 1 FIXME */
231 pci_write_config_byte(pdev
, 0x4C, setup
);
234 /* Load the PIO mode bits */
235 pci_write_config_byte(pdev
, 0x4F - ap
->port_no
,
236 ((FIT(t
.act8b
, 1, 16) - 1) << 4) | (FIT(t
.rec8b
, 1, 16) - 1));
237 pci_write_config_byte(pdev
, 0x48 + offset
,
238 ((FIT(t
.active
, 1, 16) - 1) << 4) | (FIT(t
.recover
, 1, 16) - 1));
240 /* Load the UDMA bits according to type */
246 ut
= t
.udma
? (0xe0 | (FIT(t
.udma
, 2, 5) - 2)) : 0x03;
249 ut
= t
.udma
? (0xe8 | (FIT(t
.udma
, 2, 9) - 2)) : 0x0f;
252 ut
= t
.udma
? (0xe0 | (FIT(t
.udma
, 2, 9) - 2)) : 0x07;
255 ut
= t
.udma
? (0xe0 | (FIT(t
.udma
, 2, 9) - 2)) : 0x07;
258 /* Set UDMA unless device is not UDMA capable */
260 pci_write_config_byte(pdev
, 0x50 + offset
, ut
);
263 static void via_set_piomode(struct ata_port
*ap
, struct ata_device
*adev
)
265 const struct via_isa_bridge
*config
= ap
->host
->private_data
;
266 int set_ast
= (config
->flags
& VIA_BAD_AST
) ? 0 : 1;
267 int mode
= config
->flags
& VIA_UDMA
;
268 static u8 tclock
[5] = { 1, 1, 2, 3, 4 };
269 static u8 udma
[5] = { 0, 33, 66, 100, 133 };
271 via_do_set_mode(ap
, adev
, adev
->pio_mode
, tclock
[mode
], set_ast
, udma
[mode
]);
274 static void via_set_dmamode(struct ata_port
*ap
, struct ata_device
*adev
)
276 const struct via_isa_bridge
*config
= ap
->host
->private_data
;
277 int set_ast
= (config
->flags
& VIA_BAD_AST
) ? 0 : 1;
278 int mode
= config
->flags
& VIA_UDMA
;
279 static u8 tclock
[5] = { 1, 1, 2, 3, 4 };
280 static u8 udma
[5] = { 0, 33, 66, 100, 133 };
282 via_do_set_mode(ap
, adev
, adev
->dma_mode
, tclock
[mode
], set_ast
, udma
[mode
]);
285 static struct scsi_host_template via_sht
= {
286 .module
= THIS_MODULE
,
288 .ioctl
= ata_scsi_ioctl
,
289 .queuecommand
= ata_scsi_queuecmd
,
290 .can_queue
= ATA_DEF_QUEUE
,
291 .this_id
= ATA_SHT_THIS_ID
,
292 .sg_tablesize
= LIBATA_MAX_PRD
,
293 .cmd_per_lun
= ATA_SHT_CMD_PER_LUN
,
294 .emulated
= ATA_SHT_EMULATED
,
295 .use_clustering
= ATA_SHT_USE_CLUSTERING
,
296 .proc_name
= DRV_NAME
,
297 .dma_boundary
= ATA_DMA_BOUNDARY
,
298 .slave_configure
= ata_scsi_slave_config
,
299 .slave_destroy
= ata_scsi_slave_destroy
,
300 .bios_param
= ata_std_bios_param
,
301 .resume
= ata_scsi_device_resume
,
302 .suspend
= ata_scsi_device_suspend
,
305 static struct ata_port_operations via_port_ops
= {
306 .port_disable
= ata_port_disable
,
307 .set_piomode
= via_set_piomode
,
308 .set_dmamode
= via_set_dmamode
,
309 .mode_filter
= ata_pci_default_filter
,
311 .tf_load
= ata_tf_load
,
312 .tf_read
= ata_tf_read
,
313 .check_status
= ata_check_status
,
314 .exec_command
= ata_exec_command
,
315 .dev_select
= ata_std_dev_select
,
317 .freeze
= ata_bmdma_freeze
,
318 .thaw
= ata_bmdma_thaw
,
319 .error_handler
= via_error_handler
,
320 .post_internal_cmd
= ata_bmdma_post_internal_cmd
,
322 .bmdma_setup
= ata_bmdma_setup
,
323 .bmdma_start
= ata_bmdma_start
,
324 .bmdma_stop
= ata_bmdma_stop
,
325 .bmdma_status
= ata_bmdma_status
,
327 .qc_prep
= ata_qc_prep
,
328 .qc_issue
= ata_qc_issue_prot
,
330 .data_xfer
= ata_pio_data_xfer
,
332 .irq_handler
= ata_interrupt
,
333 .irq_clear
= ata_bmdma_irq_clear
,
335 .port_start
= ata_port_start
,
336 .port_stop
= ata_port_stop
,
337 .host_stop
= ata_host_stop
340 static struct ata_port_operations via_port_ops_noirq
= {
341 .port_disable
= ata_port_disable
,
342 .set_piomode
= via_set_piomode
,
343 .set_dmamode
= via_set_dmamode
,
344 .mode_filter
= ata_pci_default_filter
,
346 .tf_load
= ata_tf_load
,
347 .tf_read
= ata_tf_read
,
348 .check_status
= ata_check_status
,
349 .exec_command
= ata_exec_command
,
350 .dev_select
= ata_std_dev_select
,
352 .freeze
= ata_bmdma_freeze
,
353 .thaw
= ata_bmdma_thaw
,
354 .error_handler
= via_error_handler
,
355 .post_internal_cmd
= ata_bmdma_post_internal_cmd
,
357 .bmdma_setup
= ata_bmdma_setup
,
358 .bmdma_start
= ata_bmdma_start
,
359 .bmdma_stop
= ata_bmdma_stop
,
360 .bmdma_status
= ata_bmdma_status
,
362 .qc_prep
= ata_qc_prep
,
363 .qc_issue
= ata_qc_issue_prot
,
365 .data_xfer
= ata_pio_data_xfer_noirq
,
367 .irq_handler
= ata_interrupt
,
368 .irq_clear
= ata_bmdma_irq_clear
,
370 .port_start
= ata_port_start
,
371 .port_stop
= ata_port_stop
,
372 .host_stop
= ata_host_stop
376 * via_config_fifo - set up the FIFO
378 * @flags: configuration flags
380 * Set the FIFO properties for this device if neccessary. Used both on
381 * set up and on and the resume path
384 static void via_config_fifo(struct pci_dev
*pdev
, unsigned int flags
)
388 /* 0x40 low bits indicate enabled channels */
389 pci_read_config_byte(pdev
, 0x40 , &enable
);
392 if (flags
& VIA_SET_FIFO
) {
393 u8 fifo_setting
[4] = {0x00, 0x60, 0x00, 0x20};
396 pci_read_config_byte(pdev
, 0x43, &fifo
);
398 /* Clear PREQ# until DDACK# for errata */
399 if (flags
& VIA_BAD_PREQ
)
403 /* Turn on FIFO for enabled channels */
404 fifo
|= fifo_setting
[enable
];
405 pci_write_config_byte(pdev
, 0x43, fifo
);
410 * via_init_one - discovery callback
412 * @id: PCI table info
414 * A VIA IDE interface has been discovered. Figure out what revision
415 * and perform configuration work before handing it to the ATA layer
418 static int via_init_one(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
420 /* Early VIA without UDMA support */
421 static struct ata_port_info via_mwdma_info
= {
423 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
426 .port_ops
= &via_port_ops
428 /* Ditto with IRQ masking required */
429 static struct ata_port_info via_mwdma_info_borked
= {
431 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
434 .port_ops
= &via_port_ops_noirq
,
436 /* VIA UDMA 33 devices (and borked 66) */
437 static struct ata_port_info via_udma33_info
= {
439 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
443 .port_ops
= &via_port_ops
445 /* VIA UDMA 66 devices */
446 static struct ata_port_info via_udma66_info
= {
448 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
452 .port_ops
= &via_port_ops
454 /* VIA UDMA 100 devices */
455 static struct ata_port_info via_udma100_info
= {
457 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
461 .port_ops
= &via_port_ops
463 /* UDMA133 with bad AST (All current 133) */
464 static struct ata_port_info via_udma133_info
= {
466 .flags
= ATA_FLAG_SLAVE_POSS
| ATA_FLAG_SETXFER_POLLING
,
469 .udma_mask
= 0x7f, /* FIXME: should check north bridge */
470 .port_ops
= &via_port_ops
472 struct ata_port_info
*port_info
[2], *type
;
473 struct pci_dev
*isa
= NULL
;
474 const struct via_isa_bridge
*config
;
475 static int printed_version
;
480 if (!printed_version
++)
481 dev_printk(KERN_DEBUG
, &pdev
->dev
, "version " DRV_VERSION
"\n");
483 /* To find out how the IDE will behave and what features we
484 actually have to look at the bridge not the IDE controller */
485 for (config
= via_isa_bridges
; config
->id
; config
++)
486 if ((isa
= pci_get_device(PCI_VENDOR_ID_VIA
+
487 !!(config
->flags
& VIA_BAD_ID
),
488 config
->id
, NULL
))) {
490 pci_read_config_byte(isa
, PCI_REVISION_ID
, &t
);
491 if (t
>= config
->rev_min
&&
492 t
<= config
->rev_max
)
498 printk(KERN_WARNING
"via: Unknown VIA SouthBridge, disabling.\n");
503 /* 0x40 low bits indicate enabled channels */
504 pci_read_config_byte(pdev
, 0x40 , &enable
);
510 /* Initialise the FIFO for the enabled channels. */
511 via_config_fifo(pdev
, config
->flags
);
514 switch(config
->flags
& VIA_UDMA
) {
516 if (config
->flags
& VIA_NO_UNMASK
)
517 type
= &via_mwdma_info_borked
;
519 type
= &via_mwdma_info
;
522 type
= &via_udma33_info
;
525 type
= &via_udma66_info
;
526 /* The 66 MHz devices require we enable the clock */
527 pci_read_config_dword(pdev
, 0x50, &timing
);
529 pci_write_config_dword(pdev
, 0x50, timing
);
532 type
= &via_udma100_info
;
535 type
= &via_udma133_info
;
542 if (config
->flags
& VIA_BAD_CLK66
) {
543 /* Disable the 66MHz clock on problem devices */
544 pci_read_config_dword(pdev
, 0x50, &timing
);
546 pci_write_config_dword(pdev
, 0x50, timing
);
549 /* We have established the device type, now fire it up */
550 type
->private_data
= (void *)config
;
552 port_info
[0] = port_info
[1] = type
;
553 return ata_pci_init_one(pdev
, port_info
, 2);
557 * via_reinit_one - reinit after resume
560 * Called when the VIA PATA device is resumed. We must then
561 * reconfigure the fifo and other setup we may have altered. In
562 * addition the kernel needs to have the resume methods on PCI
566 static int via_reinit_one(struct pci_dev
*pdev
)
569 struct ata_host
*host
= dev_get_drvdata(&pdev
->dev
);
570 const struct via_isa_bridge
*config
= host
->private_data
;
572 via_config_fifo(pdev
, config
->flags
);
574 if ((config
->flags
& VIA_UDMA
) == VIA_UDMA_66
) {
575 /* The 66 MHz devices require we enable the clock */
576 pci_read_config_dword(pdev
, 0x50, &timing
);
578 pci_write_config_dword(pdev
, 0x50, timing
);
580 if (config
->flags
& VIA_BAD_CLK66
) {
581 /* Disable the 66MHz clock on problem devices */
582 pci_read_config_dword(pdev
, 0x50, &timing
);
584 pci_write_config_dword(pdev
, 0x50, timing
);
586 return ata_pci_device_resume(pdev
);
589 static const struct pci_device_id via
[] = {
590 { PCI_VDEVICE(VIA
, PCI_DEVICE_ID_VIA_82C576_1
), },
591 { PCI_VDEVICE(VIA
, PCI_DEVICE_ID_VIA_82C586_1
), },
592 { PCI_VDEVICE(VIA
, PCI_DEVICE_ID_VIA_6410
), },
593 { PCI_VDEVICE(VIA
, PCI_DEVICE_ID_VIA_SATA_EIDE
), },
598 static struct pci_driver via_pci_driver
= {
601 .probe
= via_init_one
,
602 .remove
= ata_pci_remove_one
,
603 .suspend
= ata_pci_device_suspend
,
604 .resume
= via_reinit_one
,
607 static int __init
via_init(void)
609 return pci_register_driver(&via_pci_driver
);
612 static void __exit
via_exit(void)
614 pci_unregister_driver(&via_pci_driver
);
617 MODULE_AUTHOR("Alan Cox");
618 MODULE_DESCRIPTION("low-level driver for VIA PATA");
619 MODULE_LICENSE("GPL");
620 MODULE_DEVICE_TABLE(pci
, via
);
621 MODULE_VERSION(DRV_VERSION
);
623 module_init(via_init
);
624 module_exit(via_exit
);