2 * New ATA layer SC1200 driver Alan Cox <alan@lxorguk.ukuu.org.uk>
4 * TODO: Mode selection filtering
5 * TODO: Needs custom DMA cleanup code
7 * Based very heavily on
9 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
11 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
12 * May be copied or modified under the terms of the GNU General Public License
14 * Development of this chipset driver was funded
15 * by the nice folks at National Semiconductor.
17 * This program is free software; you can redistribute it and/or modify
18 * it under the terms of the GNU General Public License version 2 as
19 * published by the Free Software Foundation.
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
32 #include <linux/kernel.h>
33 #include <linux/module.h>
34 #include <linux/pci.h>
35 #include <linux/init.h>
36 #include <linux/blkdev.h>
37 #include <linux/delay.h>
38 #include <scsi/scsi_host.h>
39 #include <linux/libata.h>
41 #define DRV_NAME "sc1200"
42 #define DRV_VERSION "0.2.6"
44 #define SC1200_REV_A 0x00
45 #define SC1200_REV_B1 0x01
46 #define SC1200_REV_B3 0x02
47 #define SC1200_REV_C1 0x03
48 #define SC1200_REV_D1 0x04
51 * sc1200_clock - PCI clock
53 * Return the PCI bus clocking for the SC1200 chipset configuration
54 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
57 static int sc1200_clock(void)
59 /* Magic registers that give us the chipset data */
60 u8 chip_id
= inb(0x903C);
61 u8 silicon_rev
= inb(0x903D);
64 if (chip_id
== 0x04 && silicon_rev
< SC1200_REV_B1
)
65 return 0; /* 33 MHz mode */
67 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
68 0/3 is 33Mhz 1 is 48 2 is 66 */
70 pci_clock
= inw(0x901E);
79 * sc1200_set_piomode - PIO setup
81 * @adev: device on the interface
83 * Set our PIO requirements. This is fairly simple on the SC1200
86 static void sc1200_set_piomode(struct ata_port
*ap
, struct ata_device
*adev
)
88 static const u32 pio_timings
[4][5] = {
89 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
90 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
91 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
92 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz
95 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
97 unsigned int reg
= 0x40 + 0x10 * ap
->port_no
;
98 int mode
= adev
->pio_mode
- XFER_PIO_0
;
100 pci_read_config_dword(pdev
, reg
+ 4, &format
);
102 format
+= sc1200_clock();
103 pci_write_config_dword(pdev
, reg
+ 8 * adev
->devno
,
104 pio_timings
[format
][mode
]);
108 * sc1200_set_dmamode - DMA timing setup
110 * @adev: Device being configured
112 * We cannot mix MWDMA and UDMA without reloading timings each switch
116 static void sc1200_set_dmamode(struct ata_port
*ap
, struct ata_device
*adev
)
118 static const u32 udma_timing
[3][3] = {
119 { 0x00921250, 0x00911140, 0x00911030 },
120 { 0x00932470, 0x00922260, 0x00922140 },
121 { 0x009436A1, 0x00933481, 0x00923261 }
124 static const u32 mwdma_timing
[3][3] = {
125 { 0x00077771, 0x00012121, 0x00002020 },
126 { 0x000BBBB2, 0x00024241, 0x00013131 },
127 { 0x000FFFF3, 0x00035352, 0x00015151 }
130 int clock
= sc1200_clock();
131 struct pci_dev
*pdev
= to_pci_dev(ap
->host
->dev
);
132 unsigned int reg
= 0x40 + 0x10 * ap
->port_no
;
133 int mode
= adev
->dma_mode
;
136 if (mode
>= XFER_UDMA_0
)
137 format
= udma_timing
[clock
][mode
- XFER_UDMA_0
];
139 format
= mwdma_timing
[clock
][mode
- XFER_MW_DMA_0
];
141 if (adev
->devno
== 0) {
144 pci_read_config_dword(pdev
, reg
+ 4, &timings
);
145 timings
&= 0x80000000UL
;
147 pci_write_config_dword(pdev
, reg
+ 4, timings
);
149 pci_write_config_dword(pdev
, reg
+ 12, format
);
153 * sc1200_qc_issue - command issue
154 * @qc: command pending
156 * Called when the libata layer is about to issue a command. We wrap
157 * this interface so that we can load the correct ATA timings if
158 * necessary. Specifically we have a problem that there is only
159 * one MWDMA/UDMA bit.
162 static unsigned int sc1200_qc_issue(struct ata_queued_cmd
*qc
)
164 struct ata_port
*ap
= qc
->ap
;
165 struct ata_device
*adev
= qc
->dev
;
166 struct ata_device
*prev
= ap
->private_data
;
168 /* See if the DMA settings could be wrong */
169 if (ata_dma_enabled(adev
) && adev
!= prev
&& prev
!= NULL
) {
170 /* Maybe, but do the channels match MWDMA/UDMA ? */
171 if ((ata_using_udma(adev
) && !ata_using_udma(prev
)) ||
172 (ata_using_udma(prev
) && !ata_using_udma(adev
)))
173 /* Switch the mode bits */
174 sc1200_set_dmamode(ap
, adev
);
177 return ata_sff_qc_issue(qc
);
181 * sc1200_qc_defer - implement serialization
184 * Serialize command issue on this controller.
187 static int sc1200_qc_defer(struct ata_queued_cmd
*qc
)
189 struct ata_host
*host
= qc
->ap
->host
;
190 struct ata_port
*alt
= host
->ports
[1 ^ qc
->ap
->port_no
];
193 /* First apply the usual rules */
194 rc
= ata_std_qc_defer(qc
);
198 /* Now apply serialization rules. Only allow a command if the
199 other channel state machine is idle */
200 if (alt
&& alt
->qc_active
)
201 return ATA_DEFER_PORT
;
205 static struct scsi_host_template sc1200_sht
= {
206 ATA_BMDMA_SHT(DRV_NAME
),
207 .sg_tablesize
= LIBATA_DUMB_MAX_PRD
,
210 static struct ata_port_operations sc1200_port_ops
= {
211 .inherits
= &ata_bmdma_port_ops
,
212 .qc_prep
= ata_sff_dumb_qc_prep
,
213 .qc_issue
= sc1200_qc_issue
,
214 .qc_defer
= sc1200_qc_defer
,
215 .cable_detect
= ata_cable_40wire
,
216 .set_piomode
= sc1200_set_piomode
,
217 .set_dmamode
= sc1200_set_dmamode
,
221 * sc1200_init_one - Initialise an SC1200
223 * @id: Entry in match table
225 * Just throw the needed data at the libata helper and it does all
229 static int sc1200_init_one(struct pci_dev
*dev
, const struct pci_device_id
*id
)
231 static const struct ata_port_info info
= {
232 .flags
= ATA_FLAG_SLAVE_POSS
,
233 .pio_mask
= ATA_PIO4
,
234 .mwdma_mask
= ATA_MWDMA2
,
235 .udma_mask
= ATA_UDMA2
,
236 .port_ops
= &sc1200_port_ops
238 const struct ata_port_info
*ppi
[] = { &info
, NULL
};
240 return ata_pci_sff_init_one(dev
, ppi
, &sc1200_sht
, NULL
, 0);
243 static const struct pci_device_id sc1200
[] = {
244 { PCI_VDEVICE(NS
, PCI_DEVICE_ID_NS_SCx200_IDE
), },
249 static struct pci_driver sc1200_pci_driver
= {
252 .probe
= sc1200_init_one
,
253 .remove
= ata_pci_remove_one
,
255 .suspend
= ata_pci_device_suspend
,
256 .resume
= ata_pci_device_resume
,
260 static int __init
sc1200_init(void)
262 return pci_register_driver(&sc1200_pci_driver
);
265 static void __exit
sc1200_exit(void)
267 pci_unregister_driver(&sc1200_pci_driver
);
270 MODULE_AUTHOR("Alan Cox, Mark Lord");
271 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
272 MODULE_LICENSE("GPL");
273 MODULE_DEVICE_TABLE(pci
, sc1200
);
274 MODULE_VERSION(DRV_VERSION
);
276 module_init(sc1200_init
);
277 module_exit(sc1200_exit
);