2 * pata_cmd640.c - CMD640 PCI PATA for new ATA layer
4 * Alan Cox <alan@redhat.com>
7 * linux/drivers/ide/pci/cmd640.c Version 1.02 Sep 01, 1996
9 * Copyright (C) 1995-1996 Linus Torvalds & authors (see driver)
11 * This drives only the PCI version of the controller. If you have a
12 * VLB one then we have enough docs to support it but you can write
16 #include <linux/kernel.h>
17 #include <linux/module.h>
18 #include <linux/pci.h>
19 #include <linux/init.h>
20 #include <linux/blkdev.h>
21 #include <linux/delay.h>
22 #include <scsi/scsi_host.h>
23 #include <linux/libata.h>
25 #define DRV_NAME "pata_cmd640"
26 #define DRV_VERSION "0.0.5"
30 u8 reg58
[ATA_MAX_DEVICES
];
45 * cmd640_set_piomode - set initial PIO mode data
49 * Called to do the PIO mode setup.
52 static void cmd640_set_piomode(struct ata_port
*ap
, struct ata_device
*adev
)
54 struct cmd640_reg
*timing
= ap
->private_data
;
55 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
57 const unsigned long T
= 1000000 / 33;
58 const u8 setup_data
[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
60 int arttim
= ARTIM0
+ 2 * adev
->devno
;
61 struct ata_device
*pair
= ata_dev_pair(adev
);
63 if (ata_timing_compute(adev
, adev
->pio_mode
, &t
, T
, 0) < 0) {
64 printk(KERN_ERR DRV_NAME
": mode computation failed.\n");
68 /* The second channel has shared timings and the setup timing is
69 messy to switch to merge it for worst case */
70 if (ap
->port_no
&& pair
) {
72 ata_timing_compute(pair
, pair
->pio_mode
, &p
, T
, 1);
73 ata_timing_merge(&p
, &t
, &t
, ATA_TIMING_SETUP
);
76 /* Make the timings fit */
78 t
.active
+= t
.recover
- 16;
84 /* Now convert the clocks into values we can actually stuff into
88 t
.recover
--; /* 640B only */
95 t
.setup
= setup_data
[t
.setup
];
97 if (ap
->port_no
== 0) {
98 t
.active
&= 0x0F; /* 0 = 16 */
100 /* Load setup timing */
101 pci_read_config_byte(pdev
, arttim
, ®
);
104 pci_write_config_byte(pdev
, arttim
, reg
);
106 /* Load active/recovery */
107 pci_write_config_byte(pdev
, arttim
+ 1, (t
.active
<< 4) | t
.recover
);
109 /* Save the shared timings for channel, they will be loaded
110 by qc_issue_prot. Reloading the setup time is expensive
111 so we keep a merged one loaded */
112 pci_read_config_byte(pdev
, ARTIM23
, ®
);
115 pci_write_config_byte(pdev
, ARTIM23
, reg
);
116 timing
->reg58
[adev
->devno
] = (t
.active
<< 4) | t
.recover
;
122 * cmd640_qc_issue_prot - command preparation hook
123 * @qc: Command to be issued
125 * Channel 1 has shared timings. We must reprogram the
126 * clock each drive 2/3 switch we do.
129 static unsigned int cmd640_qc_issue_prot(struct ata_queued_cmd
*qc
)
131 struct ata_port
*ap
= qc
->ap
;
132 struct ata_device
*adev
= qc
->dev
;
133 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
134 struct cmd640_reg
*timing
= ap
->private_data
;
136 if (ap
->port_no
!= 0 && adev
->devno
!= timing
->last
) {
137 pci_write_config_byte(pdev
, DRWTIM23
, timing
->reg58
[adev
->devno
]);
138 timing
->last
= adev
->devno
;
140 return ata_qc_issue_prot(qc
);
144 * cmd640_port_start - port setup
145 * @ap: ATA port being set up
147 * The CMD640 needs to maintain private data structures so we
148 * allocate space here.
151 static int cmd640_port_start(struct ata_port
*ap
)
153 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
154 struct cmd640_reg
*timing
;
156 int ret
= ata_port_start(ap
);
160 timing
= devm_kzalloc(&pdev
->dev
, sizeof(struct cmd640_reg
), GFP_KERNEL
);
163 timing
->last
= -1; /* Force a load */
164 ap
->private_data
= timing
;
168 static struct scsi_host_template cmd640_sht
= {
169 .module
= THIS_MODULE
,
171 .ioctl
= ata_scsi_ioctl
,
172 .queuecommand
= ata_scsi_queuecmd
,
173 .can_queue
= ATA_DEF_QUEUE
,
174 .this_id
= ATA_SHT_THIS_ID
,
175 .sg_tablesize
= LIBATA_MAX_PRD
,
176 .cmd_per_lun
= ATA_SHT_CMD_PER_LUN
,
177 .emulated
= ATA_SHT_EMULATED
,
178 .use_clustering
= ATA_SHT_USE_CLUSTERING
,
179 .proc_name
= DRV_NAME
,
180 .dma_boundary
= ATA_DMA_BOUNDARY
,
181 .slave_configure
= ata_scsi_slave_config
,
182 .slave_destroy
= ata_scsi_slave_destroy
,
183 .bios_param
= ata_std_bios_param
,
186 static struct ata_port_operations cmd640_port_ops
= {
187 .set_piomode
= cmd640_set_piomode
,
188 .mode_filter
= ata_pci_default_filter
,
189 .tf_load
= ata_tf_load
,
190 .tf_read
= ata_tf_read
,
191 .check_status
= ata_check_status
,
192 .exec_command
= ata_exec_command
,
193 .dev_select
= ata_std_dev_select
,
195 .freeze
= ata_bmdma_freeze
,
196 .thaw
= ata_bmdma_thaw
,
197 .error_handler
= ata_bmdma_error_handler
,
198 .post_internal_cmd
= ata_bmdma_post_internal_cmd
,
199 .cable_detect
= ata_cable_40wire
,
201 .bmdma_setup
= ata_bmdma_setup
,
202 .bmdma_start
= ata_bmdma_start
,
203 .bmdma_stop
= ata_bmdma_stop
,
204 .bmdma_status
= ata_bmdma_status
,
206 .qc_prep
= ata_qc_prep
,
207 .qc_issue
= cmd640_qc_issue_prot
,
209 /* In theory this is not needed once we kill the prefetcher */
210 .data_xfer
= ata_data_xfer_noirq
,
212 .irq_handler
= ata_interrupt
,
213 .irq_clear
= ata_bmdma_irq_clear
,
214 .irq_on
= ata_irq_on
,
216 .port_start
= cmd640_port_start
,
219 static void cmd640_hardware_init(struct pci_dev
*pdev
)
224 /* CMD640 detected, commiserations */
225 pci_write_config_byte(pdev
, 0x5B, 0x00);
226 /* Get version info */
227 pci_read_config_byte(pdev
, CFR
, &r
);
228 /* PIO0 command cycles */
229 pci_write_config_byte(pdev
, CMDTIM
, 0);
230 /* 512 byte bursts (sector) */
231 pci_write_config_byte(pdev
, BRST
, 0x40);
233 * A reporter a long time ago
234 * Had problems with the data fifo
235 * So don't run the risk
236 * Of putting crap on the disk
237 * For its better just to go slow
240 pci_read_config_byte(pdev
, CNTRL
, &ctrl
);
241 pci_write_config_byte(pdev
, CNTRL
, ctrl
| 0xC0);
242 /* Ditto for channel 1 */
243 pci_read_config_byte(pdev
, ARTIM23
, &ctrl
);
245 pci_write_config_byte(pdev
, ARTIM23
, ctrl
);
248 static int cmd640_init_one(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
250 static const struct ata_port_info info
= {
252 .flags
= ATA_FLAG_SLAVE_POSS
,
254 .port_ops
= &cmd640_port_ops
256 const struct ata_port_info
*ppi
[] = { &info
, NULL
};
258 cmd640_hardware_init(pdev
);
259 return ata_pci_init_one(pdev
, ppi
);
262 static int cmd640_reinit_one(struct pci_dev
*pdev
)
264 cmd640_hardware_init(pdev
);
266 return ata_pci_device_resume(pdev
);
272 static const struct pci_device_id cmd640
[] = {
273 { PCI_VDEVICE(CMD
, 0x640), 0 },
277 static struct pci_driver cmd640_pci_driver
= {
280 .probe
= cmd640_init_one
,
281 .remove
= ata_pci_remove_one
,
283 .suspend
= ata_pci_device_suspend
,
285 .resume
= cmd640_reinit_one
,
288 static int __init
cmd640_init(void)
290 return pci_register_driver(&cmd640_pci_driver
);
293 static void __exit
cmd640_exit(void)
295 pci_unregister_driver(&cmd640_pci_driver
);
298 MODULE_AUTHOR("Alan Cox");
299 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
300 MODULE_LICENSE("GPL");
301 MODULE_DEVICE_TABLE(pci
, cmd640
);
302 MODULE_VERSION(DRV_VERSION
);
304 module_init(cmd640_init
);
305 module_exit(cmd640_exit
);