2 * New ATA layer SC1200 driver Alan Cox <alan@redhat.com>
4 * TODO: Mode selection filtering
5 * TODO: Can't enable second channel until ATA core has serialize
6 * TODO: Needs custom DMA cleanup code
8 * Based very heavily on
10 * linux/drivers/ide/pci/sc1200.c Version 0.91 28-Jan-2003
12 * Copyright (C) 2000-2002 Mark Lord <mlord@pobox.com>
13 * May be copied or modified under the terms of the GNU General Public License
15 * Development of this chipset driver was funded
16 * by the nice folks at National Semiconductor.
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
22 * This program is distributed in the hope that it will be useful,
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25 * GNU General Public License for more details.
27 * You should have received a copy of the GNU General Public License
28 * along with this program; if not, write to the Free Software
29 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
33 #include <linux/kernel.h>
34 #include <linux/module.h>
35 #include <linux/pci.h>
36 #include <linux/init.h>
37 #include <linux/blkdev.h>
38 #include <linux/delay.h>
39 #include <scsi/scsi_host.h>
40 #include <linux/libata.h>
42 #define DRV_NAME "sc1200"
43 #define DRV_VERSION "0.2.6"
45 #define SC1200_REV_A 0x00
46 #define SC1200_REV_B1 0x01
47 #define SC1200_REV_B3 0x02
48 #define SC1200_REV_C1 0x03
49 #define SC1200_REV_D1 0x04
52 * sc1200_clock - PCI clock
54 * Return the PCI bus clocking for the SC1200 chipset configuration
55 * in use. We return 0 for 33MHz 1 for 48MHz and 2 for 66Mhz
58 static int sc1200_clock(void)
60 /* Magic registers that give us the chipset data */
61 u8 chip_id = inb(0x903C);
62 u8 silicon_rev = inb(0x903D);
65 if (chip_id == 0x04 && silicon_rev < SC1200_REV_B1)
66 return 0; /* 33 MHz mode */
68 /* Clock generator configuration 0x901E its 8/9 are the PCI clocking
69 0/3 is 33Mhz 1 is 48 2 is 66 */
71 pci_clock = inw(0x901E);
80 * sc1200_set_piomode - PIO setup
82 * @adev: device on the interface
84 * Set our PIO requirements. This is fairly simple on the SC1200
87 static void sc1200_set_piomode(struct ata_port *ap, struct ata_device *adev)
89 static const u32 pio_timings[4][5] = {
90 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010}, // format0 33Mhz
91 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}, // format1, 33Mhz
92 {0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021}, // format1, 48Mhz
93 {0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131} // format1, 66Mhz
96 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
98 unsigned int reg = 0x40 + 0x10 * ap->port_no;
99 int mode = adev->pio_mode - XFER_PIO_0;
101 pci_read_config_dword(pdev, reg + 4, &format);
103 format += sc1200_clock();
104 pci_write_config_dword(pdev, reg + 8 * adev->devno,
105 pio_timings[format][mode]);
109 * sc1200_set_dmamode - DMA timing setup
111 * @adev: Device being configured
113 * We cannot mix MWDMA and UDMA without reloading timings each switch
117 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
119 static const u32 udma_timing[3][3] = {
120 { 0x00921250, 0x00911140, 0x00911030 },
121 { 0x00932470, 0x00922260, 0x00922140 },
122 { 0x009436A1, 0x00933481, 0x00923261 }
125 static const u32 mwdma_timing[3][3] = {
126 { 0x00077771, 0x00012121, 0x00002020 },
127 { 0x000BBBB2, 0x00024241, 0x00013131 },
128 { 0x000FFFF3, 0x00035352, 0x00015151 }
131 int clock = sc1200_clock();
132 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
133 unsigned int reg = 0x40 + 0x10 * ap->port_no;
134 int mode = adev->dma_mode;
137 if (mode >= XFER_UDMA_0)
138 format = udma_timing[clock][mode - XFER_UDMA_0];
140 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
142 if (adev->devno == 0) {
145 pci_read_config_dword(pdev, reg + 4, &timings);
146 timings &= 0x80000000UL;
148 pci_write_config_dword(pdev, reg + 4, timings);
150 pci_write_config_dword(pdev, reg + 12, format);
154 * sc1200_qc_issue - command issue
155 * @qc: command pending
157 * Called when the libata layer is about to issue a command. We wrap
158 * this interface so that we can load the correct ATA timings if
159 * necessary. Specifically we have a problem that there is only
160 * one MWDMA/UDMA bit.
163 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
165 struct ata_port *ap = qc->ap;
166 struct ata_device *adev = qc->dev;
167 struct ata_device *prev = ap->private_data;
169 /* See if the DMA settings could be wrong */
170 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
171 /* Maybe, but do the channels match MWDMA/UDMA ? */
172 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
173 (ata_using_udma(prev) && !ata_using_udma(adev)))
174 /* Switch the mode bits */
175 sc1200_set_dmamode(ap, adev);
178 return ata_sff_qc_issue(qc);
181 static struct scsi_host_template sc1200_sht = {
182 ATA_BMDMA_SHT(DRV_NAME),
183 .sg_tablesize = LIBATA_DUMB_MAX_PRD,
186 static struct ata_port_operations sc1200_port_ops = {
187 .inherits = &ata_bmdma_port_ops,
188 .qc_prep = ata_sff_dumb_qc_prep,
189 .qc_issue = sc1200_qc_issue,
190 .cable_detect = ata_cable_40wire,
191 .set_piomode = sc1200_set_piomode,
192 .set_dmamode = sc1200_set_dmamode,
196 * sc1200_init_one - Initialise an SC1200
198 * @id: Entry in match table
200 * Just throw the needed data at the libata helper and it does all
204 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
206 static const struct ata_port_info info = {
207 .flags = ATA_FLAG_SLAVE_POSS,
211 .port_ops = &sc1200_port_ops
213 /* Can't enable port 2 yet, see top comments */
214 const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
216 return ata_pci_sff_init_one(dev, ppi, &sc1200_sht, NULL);
219 static const struct pci_device_id sc1200[] = {
220 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
225 static struct pci_driver sc1200_pci_driver = {
228 .probe = sc1200_init_one,
229 .remove = ata_pci_remove_one,
231 .suspend = ata_pci_device_suspend,
232 .resume = ata_pci_device_resume,
236 static int __init sc1200_init(void)
238 return pci_register_driver(&sc1200_pci_driver);
241 static void __exit sc1200_exit(void)
243 pci_unregister_driver(&sc1200_pci_driver);
246 MODULE_AUTHOR("Alan Cox, Mark Lord");
247 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
248 MODULE_LICENSE("GPL");
249 MODULE_DEVICE_TABLE(pci, sc1200);
250 MODULE_VERSION(DRV_VERSION);
252 module_init(sc1200_init);
253 module_exit(sc1200_exit);