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 "pata_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] = {
90 { 0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010 },
92 { 0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010 },
94 { 0xfaa3f4f3, 0xc23232b2, 0x513101c1, 0x31213121, 0x10211021 },
96 { 0xfff4fff4, 0xf35353d3, 0x814102f1, 0x42314231, 0x11311131 }
99 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
101 unsigned int reg = 0x40 + 0x10 * ap->port_no;
102 int mode = adev->pio_mode - XFER_PIO_0;
104 pci_read_config_dword(pdev, reg + 4, &format);
106 format += sc1200_clock();
107 pci_write_config_dword(pdev, reg + 8 * adev->devno,
108 pio_timings[format][mode]);
112 * sc1200_set_dmamode - DMA timing setup
114 * @adev: Device being configured
116 * We cannot mix MWDMA and UDMA without reloading timings each switch
120 static void sc1200_set_dmamode(struct ata_port *ap, struct ata_device *adev)
122 static const u32 udma_timing[3][3] = {
123 { 0x00921250, 0x00911140, 0x00911030 },
124 { 0x00932470, 0x00922260, 0x00922140 },
125 { 0x009436A1, 0x00933481, 0x00923261 }
128 static const u32 mwdma_timing[3][3] = {
129 { 0x00077771, 0x00012121, 0x00002020 },
130 { 0x000BBBB2, 0x00024241, 0x00013131 },
131 { 0x000FFFF3, 0x00035352, 0x00015151 }
134 int clock = sc1200_clock();
135 struct pci_dev *pdev = to_pci_dev(ap->host->dev);
136 unsigned int reg = 0x40 + 0x10 * ap->port_no;
137 int mode = adev->dma_mode;
140 if (mode >= XFER_UDMA_0)
141 format = udma_timing[clock][mode - XFER_UDMA_0];
143 format = mwdma_timing[clock][mode - XFER_MW_DMA_0];
145 if (adev->devno == 0) {
148 pci_read_config_dword(pdev, reg + 4, &timings);
149 timings &= 0x80000000UL;
151 pci_write_config_dword(pdev, reg + 4, timings);
153 pci_write_config_dword(pdev, reg + 12, format);
157 * sc1200_qc_issue - command issue
158 * @qc: command pending
160 * Called when the libata layer is about to issue a command. We wrap
161 * this interface so that we can load the correct ATA timings if
162 * necessary. Specifically we have a problem that there is only
163 * one MWDMA/UDMA bit.
166 static unsigned int sc1200_qc_issue(struct ata_queued_cmd *qc)
168 struct ata_port *ap = qc->ap;
169 struct ata_device *adev = qc->dev;
170 struct ata_device *prev = ap->private_data;
172 /* See if the DMA settings could be wrong */
173 if (ata_dma_enabled(adev) && adev != prev && prev != NULL) {
174 /* Maybe, but do the channels match MWDMA/UDMA ? */
175 if ((ata_using_udma(adev) && !ata_using_udma(prev)) ||
176 (ata_using_udma(prev) && !ata_using_udma(adev)))
177 /* Switch the mode bits */
178 sc1200_set_dmamode(ap, adev);
181 return ata_bmdma_qc_issue(qc);
185 * sc1200_qc_defer - implement serialization
188 * Serialize command issue on this controller.
191 static int sc1200_qc_defer(struct ata_queued_cmd *qc)
193 struct ata_host *host = qc->ap->host;
194 struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
197 /* First apply the usual rules */
198 rc = ata_std_qc_defer(qc);
202 /* Now apply serialization rules. Only allow a command if the
203 other channel state machine is idle */
204 if (alt && alt->qc_active)
205 return ATA_DEFER_PORT;
209 static struct scsi_host_template sc1200_sht = {
210 ATA_BMDMA_SHT(DRV_NAME),
211 .sg_tablesize = LIBATA_DUMB_MAX_PRD,
214 static struct ata_port_operations sc1200_port_ops = {
215 .inherits = &ata_bmdma_port_ops,
216 .qc_prep = ata_bmdma_dumb_qc_prep,
217 .qc_issue = sc1200_qc_issue,
218 .qc_defer = sc1200_qc_defer,
219 .cable_detect = ata_cable_40wire,
220 .set_piomode = sc1200_set_piomode,
221 .set_dmamode = sc1200_set_dmamode,
225 * sc1200_init_one - Initialise an SC1200
227 * @id: Entry in match table
229 * Just throw the needed data at the libata helper and it does all
233 static int sc1200_init_one(struct pci_dev *dev, const struct pci_device_id *id)
235 static const struct ata_port_info info = {
236 .flags = ATA_FLAG_SLAVE_POSS,
237 .pio_mask = ATA_PIO4,
238 .mwdma_mask = ATA_MWDMA2,
239 .udma_mask = ATA_UDMA2,
240 .port_ops = &sc1200_port_ops
242 const struct ata_port_info *ppi[] = { &info, NULL };
244 return ata_pci_bmdma_init_one(dev, ppi, &sc1200_sht, NULL, 0);
247 static const struct pci_device_id sc1200[] = {
248 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_IDE), },
253 static struct pci_driver sc1200_pci_driver = {
256 .probe = sc1200_init_one,
257 .remove = ata_pci_remove_one,
259 .suspend = ata_pci_device_suspend,
260 .resume = ata_pci_device_resume,
264 module_pci_driver(sc1200_pci_driver);
266 MODULE_AUTHOR("Alan Cox, Mark Lord");
267 MODULE_DESCRIPTION("low-level driver for the NS/AMD SC1200");
268 MODULE_LICENSE("GPL");
269 MODULE_DEVICE_TABLE(pci, sc1200);
270 MODULE_VERSION(DRV_VERSION);