1 // SPDX-License-Identifier: GPL-2.0-only
3 * pata_cmd640.c - CMD640 PCI PATA for new ATA layer
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/blkdev.h>
20 #include <linux/delay.h>
21 #include <linux/gfp.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. Reloading the setup time is expensive so we
111 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 - 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(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_sff_qc_issue(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 timing
= devm_kzalloc(&pdev
->dev
, sizeof(struct cmd640_reg
), GFP_KERNEL
);
159 timing
->last
= -1; /* Force a load */
160 ap
->private_data
= timing
;
164 static bool cmd640_sff_irq_check(struct ata_port
*ap
)
166 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
167 int irq_reg
= ap
->port_no
? ARTIM23
: CFR
;
168 u8 irq_stat
, irq_mask
= ap
->port_no
? 0x10 : 0x04;
170 pci_read_config_byte(pdev
, irq_reg
, &irq_stat
);
172 return irq_stat
& irq_mask
;
175 static struct scsi_host_template cmd640_sht
= {
176 ATA_PIO_SHT(DRV_NAME
),
179 static struct ata_port_operations cmd640_port_ops
= {
180 .inherits
= &ata_sff_port_ops
,
181 /* In theory xfer_noirq is not needed once we kill the prefetcher */
182 .sff_data_xfer
= ata_sff_data_xfer32
,
183 .sff_irq_check
= cmd640_sff_irq_check
,
184 .qc_issue
= cmd640_qc_issue
,
185 .cable_detect
= ata_cable_40wire
,
186 .set_piomode
= cmd640_set_piomode
,
187 .port_start
= cmd640_port_start
,
190 static void cmd640_hardware_init(struct pci_dev
*pdev
)
194 /* CMD640 detected, commiserations */
195 pci_write_config_byte(pdev
, 0x5B, 0x00);
196 /* PIO0 command cycles */
197 pci_write_config_byte(pdev
, CMDTIM
, 0);
198 /* 512 byte bursts (sector) */
199 pci_write_config_byte(pdev
, BRST
, 0x40);
201 * A reporter a long time ago
202 * Had problems with the data fifo
203 * So don't run the risk
204 * Of putting crap on the disk
205 * For its better just to go slow
208 pci_read_config_byte(pdev
, CNTRL
, &ctrl
);
209 pci_write_config_byte(pdev
, CNTRL
, ctrl
| 0xC0);
210 /* Ditto for channel 1 */
211 pci_read_config_byte(pdev
, ARTIM23
, &ctrl
);
213 pci_write_config_byte(pdev
, ARTIM23
, ctrl
);
216 static int cmd640_init_one(struct pci_dev
*pdev
, const struct pci_device_id
*id
)
218 static const struct ata_port_info info
= {
219 .flags
= ATA_FLAG_SLAVE_POSS
,
220 .pio_mask
= ATA_PIO4
,
221 .port_ops
= &cmd640_port_ops
223 const struct ata_port_info
*ppi
[] = { &info
, NULL
};
226 rc
= pcim_enable_device(pdev
);
230 cmd640_hardware_init(pdev
);
232 return ata_pci_sff_init_one(pdev
, ppi
, &cmd640_sht
, NULL
, 0);
235 #ifdef CONFIG_PM_SLEEP
236 static int cmd640_reinit_one(struct pci_dev
*pdev
)
238 struct ata_host
*host
= pci_get_drvdata(pdev
);
241 rc
= ata_pci_device_do_resume(pdev
);
244 cmd640_hardware_init(pdev
);
245 ata_host_resume(host
);
250 static const struct pci_device_id cmd640
[] = {
251 { PCI_VDEVICE(CMD
, 0x640), 0 },
255 static struct pci_driver cmd640_pci_driver
= {
258 .probe
= cmd640_init_one
,
259 .remove
= ata_pci_remove_one
,
260 #ifdef CONFIG_PM_SLEEP
261 .suspend
= ata_pci_device_suspend
,
262 .resume
= cmd640_reinit_one
,
266 module_pci_driver(cmd640_pci_driver
);
268 MODULE_AUTHOR("Alan Cox");
269 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
270 MODULE_LICENSE("GPL");
271 MODULE_DEVICE_TABLE(pci
, cmd640
);
272 MODULE_VERSION(DRV_VERSION
);