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 /* Can't enable port 2 yet, see top comments */
239 const struct ata_port_info *ppi[] = { &info, };
241 return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
244 static const struct pci_device_id sc1200[] = {
245 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
250 static struct pci_driver sc1200_pci_driver = {
253 .probe = sc1200_init_one,
254 .remove = ata_pci_remove_one,
256 .suspend = ata_pci_device_suspend,
257 .resume = ata_pci_device_resume,
261 static int __init sc1200_init(void)
263 return pci_register_driver(&sc1200_pci_driver);
266 static void __exit sc1200_exit(void)
268 pci_unregister_driver(&sc1200_pci_driver);
271 MODULE_AUTHOR("Alan Cox, Mark Lord");
272 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
273 MODULE_LICENSE("GPL");
274 MODULE_DEVICE_TABLE(pci, sc1200);
275 MODULE_VERSION(DRV_VERSION);
277 module_init(sc1200_init);
278 module_exit(sc1200_exit);