3 * BRIEF MODULE DESCRIPTION
4 * IT8172 IDE controller support
6 * Copyright 2000 MontaVista Software Inc.
7 * Author: MontaVista Software, Inc.
8 * stevel@mvista.com or source@mvista.com
10 * This program is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by the
12 * Free Software Foundation; either version 2 of the License, or (at your
13 * option) any later version.
15 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
16 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
17 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
18 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
21 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
22 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 * You should have received a copy of the GNU General Public License along
27 * with this program; if not, write to the Free Software Foundation, Inc.,
28 * 675 Mass Ave, Cambridge, MA 02139, USA.
31 #include <linux/config.h>
32 #include <linux/module.h>
33 #include <linux/types.h>
34 #include <linux/kernel.h>
35 #include <linux/ioport.h>
36 #include <linux/pci.h>
37 #include <linux/hdreg.h>
38 #include <linux/ide.h>
39 #include <linux/delay.h>
40 #include <linux/init.h>
43 #include <asm/it8172/it8172_int.h>
45 #include "ide_modes.h"
51 static u8 it8172_ratemask (ide_drive_t *drive)
56 static void it8172_tune_drive (ide_drive_t *drive, u8 pio)
58 ide_hwif_t *hwif = HWIF(drive);
59 struct pci_dev *dev = hwif->pci_dev;
60 int is_slave = (hwif->drives[1] == drive);
65 pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
66 spin_lock_irqsave(&ide_lock, flags);
67 pci_read_config_word(dev, 0x40, &drive_enables);
68 pci_read_config_dword(dev, 0x44, &drive_timing);
71 * FIX! The DIOR/DIOW pulse width and recovery times in port 0x44
72 * are being left at the default values of 8 PCI clocks (242 nsec
73 * for a 33 MHz clock). These can be safely shortened at higher
74 * PIO modes. The DIOR/DIOW pulse width and recovery times only
75 * apply to PIO modes, not to the DMA modes.
79 * Enable port 0x44. The IT8172G spec is confused; it calls
80 * this register the "Slave IDE Timing Register", but in fact,
81 * it controls timing for both master and slave drives.
83 drive_enables |= 0x4000;
86 drive_enables &= 0xc006;
88 /* enable prefetch and IORDY sample-point */
89 drive_enables |= 0x0060;
91 drive_enables &= 0xc060;
93 /* enable prefetch and IORDY sample-point */
94 drive_enables |= 0x0006;
97 pci_write_config_word(dev, 0x40, drive_enables);
98 spin_unlock_irqrestore(&ide_lock, flags)
101 static u8 it8172_dma_2_pio (u8 xfer_rate)
130 static int it8172_tune_chipset (ide_drive_t *drive, u8 xferspeed)
132 ide_hwif_t *hwif = HWIF(drive);
133 struct pci_dev *dev = hwif->pci_dev;
134 u8 speed = ide_rate_filter(it8172_ratemask(drive), xferspeed);
135 int a_speed = 3 << (drive->dn * 4);
136 int u_flag = 1 << drive->dn;
140 pci_read_config_byte(dev, 0x48, ®48);
141 pci_read_config_byte(dev, 0x4a, ®4a);
144 * Setting the DMA cycle time to 2 or 3 PCI clocks (60 and 91 nsec
145 * at 33 MHz PCI clock) seems to cause BadCRC errors during DMA
146 * transfers on some drives, even though both numbers meet the minimum
147 * ATAPI-4 spec of 73 and 54 nsec for UDMA 1 and 2 respectively.
148 * So the faster times are just commented out here. The good news is
149 * that the slower cycle time has very little affect on transfer
155 case XFER_UDMA_2: //u_speed = 2 << (drive->dn * 4); break;
158 case XFER_UDMA_1: //u_speed = 1 << (drive->dn * 4); break;
159 case XFER_UDMA_0: u_speed = 0 << (drive->dn * 4); break;
163 case XFER_SW_DMA_2: break;
167 case XFER_PIO_0: break;
171 if (speed >= XFER_UDMA_0) {
172 pci_write_config_byte(dev, 0x48, reg48 | u_flag);
174 pci_write_config_byte(dev, 0x4a, reg4a | u_speed);
176 pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
177 pci_write_config_byte(dev, 0x4a, reg4a & ~a_speed);
180 it8172_tune_drive(drive, it8172_dma_2_pio(speed));
181 return (ide_config_drive_speed(drive, speed));
184 static int it8172_config_chipset_for_dma (ide_drive_t *drive)
186 u8 speed = ide_dma_speed(drive, it8172_ratemask(drive));
189 u8 tspeed = ide_get_best_pio_mode(drive, 255, 4, NULL);
190 speed = it8172_dma_2_pio(XFER_PIO_0 + tspeed);
193 (void) it8172_tune_chipset(drive, speed);
194 return ide_dma_enable(drive);
197 static int it8172_config_drive_xfer_rate (ide_drive_t *drive)
199 ide_hwif_t *hwif = HWIF(drive);
200 struct hd_driveid *id = drive->id;
202 drive->init_speed = 0;
204 if ((id->capability & 1) && drive->autodma) {
205 /* Consult the list of known "bad" drives */
206 if (hwif->ide_dma_bad_drive(drive))
208 if (id->field_valid & 4) {
209 if (id->dma_ultra & hwif->ultra_mask) {
210 /* Force if Capable UltraDMA */
211 int dma = it8172_config_chipset_for_dma(drive);
212 if ((id->field_valid & 2) && !dma)
215 } else if (id->field_valid & 2) {
217 if ((id->dma_mword & hwif->mwdma_mask) ||
218 (id->dma_1word & hwif->swdma_mask)) {
219 /* Force if Capable regular DMA modes */
220 if (!it8172_config_chipset_for_dma(drive))
223 } else if (hwif->ide_dma_good_drive(drive) &&
224 (id->eide_dma_time < 150)) {
225 /* Consult the list of known "good" drives */
226 if (!it8172_config_chipset_for_dma(drive))
231 return hwif->ide_dma_on(drive);
232 } else if ((id->capability & 8) || (id->field_valid & 2)) {
235 it8172_tune_drive(drive, 5);
236 return hwif->ide_dma_off_quietly(drive);
238 /* IORDY not supported */
242 static unsigned int __init init_chipset_it8172 (struct pci_dev *dev, const char *name)
244 unsigned char progif;
247 * Place both IDE interfaces into PCI "native" mode
249 pci_read_config_byte(dev, PCI_CLASS_PROG, &progif);
250 pci_write_config_byte(dev, PCI_CLASS_PROG, progif | 0x05);
252 return IT8172_IDE_IRQ;
256 static void __init init_hwif_it8172 (ide_hwif_t *hwif)
258 struct pci_dev* dev = hwif->pci_dev;
259 unsigned long cmdBase, ctrlBase;
262 hwif->tuneproc = &it8172_tune_drive;
263 hwif->speedproc = &it8172_tune_chipset;
265 cmdBase = dev->resource[0].start;
266 ctrlBase = dev->resource[1].start;
268 ide_init_hwif_ports(&hwif->hw, cmdBase, ctrlBase | 2, NULL);
269 memcpy(hwif->io_ports, hwif->hw.io_ports, sizeof(hwif->io_ports));
272 if (!hwif->dma_base) {
273 hwif->drives[0].autotune = 1;
274 hwif->drives[1].autotune = 1;
279 hwif->ultra_mask = 0x07;
280 hwif->mwdma_mask = 0x06;
281 hwif->swdma_mask = 0x04;
283 hwif->ide_dma_check = &it8172_config_drive_xfer_rate;
286 hwif->drives[0].autodma = hwif->autodma;
287 hwif->drives[1].autodma = hwif->autodma;
290 static void __init init_dma_it8172 (ide_hwif_t *hwif, unsigned long dmabase)
292 ide_setup_dma(hwif, dmabase, 8);
295 extern void ide_setup_pci_device(struct pci_dev *, ide_pci_device_t *);
297 static int __devinit it8172_init_one(struct pci_dev *dev, const struct pci_device_id *id)
299 ide_pci_device_t *d = &it8172_chipsets[id->driver_data];
300 if ((!(PCI_FUNC(dev->devfn) & 1) ||
301 (!((dev->class >> 8) == PCI_CLASS_STORAGE_IDE))))
302 return 1; /* IT8172 is more than only a IDE controller */
303 ide_setup_pci_device(dev, d);
308 static struct pci_device_id it8172_pci_tbl[] __devinitdata = {
309 { PCI_VENDOR_ID_ITE, PCI_DEVICE_ID_ITE_IT8172G, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
313 static struct pci_driver driver = {
315 .id_table = it8172_pci_tbl,
316 .probe = it8172_init_one,
319 static int it8172_ide_init(void)
321 return ide_pci_register_driver(&driver);
324 static void it8172_ide_exit(void)
326 ide_pci_unregister_driver(&driver);
329 module_init(it8172_ide_init);
330 module_exit(it8172_ide_exit);
332 MODULE_AUTHOR("SteveL@mvista.com");
333 MODULE_DESCRIPTION("PCI driver module for ITE 8172 IDE");
334 MODULE_LICENSE("GPL");