2 * IDE tuning and bus mastering support for the CS5510/CS5520
5 * The CS5510/CS5520 are slightly unusual devices. Unlike the
6 * typical IDE controllers they do bus mastering with the drive in
7 * PIO mode and smarter silicon.
9 * The practical upshot of this is that we must always tune the
10 * drive for the right PIO mode. We must also ignore all the blacklists
11 * and the drive bus mastering DMA information.
13 * *** This driver is strictly experimental ***
15 * (c) Copyright Red Hat Inc 2002
17 * This program is free software; you can redistribute it and/or modify it
18 * under the terms of the GNU General Public License as published by the
19 * Free Software Foundation; either version 2, or (at your option) any
22 * This program is distributed in the hope that it will be useful, but
23 * WITHOUT ANY WARRANTY; without even the implied warranty of
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
25 * General Public License for more details.
27 * For the avoidance of doubt the "preferred form" of this code is one which
28 * is in an open non patent encumbered format. Where cryptographic key signing
29 * forms part of the process of creating an executable the information
30 * including keys needed to generate an equivalently functional executable
31 * are deemed to be part of the source code.
35 #include <linux/module.h>
36 #include <linux/types.h>
37 #include <linux/kernel.h>
38 #include <linux/delay.h>
39 #include <linux/timer.h>
41 #include <linux/ioport.h>
42 #include <linux/blkdev.h>
43 #include <linux/hdreg.h>
45 #include <linux/interrupt.h>
46 #include <linux/init.h>
47 #include <linux/pci.h>
48 #include <linux/ide.h>
49 #include <linux/dma-mapping.h>
61 static struct pio_clocks cs5520_pio_clocks[]={
69 static int cs5520_tune_chipset(ide_drive_t *drive, const u8 speed)
71 ide_hwif_t *hwif = HWIF(drive);
72 struct pci_dev *pdev = hwif->pci_dev;
75 int controller = drive->dn > 1 ? 1 : 0;
89 printk(KERN_ERR "cs55x0: bad ide timing.\n");
92 printk("PIO clocking = %d\n", pio);
94 /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
96 /* 8bit CAT/CRT - 8bit command timing for channel */
97 pci_write_config_byte(pdev, 0x62 + controller,
98 (cs5520_pio_clocks[pio].recovery << 4) |
99 (cs5520_pio_clocks[pio].assert));
101 /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
103 /* FIXME: should these use address ? */
104 /* Data read timing */
105 pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
106 (cs5520_pio_clocks[pio].recovery << 4) |
107 (cs5520_pio_clocks[pio].assert));
108 /* Write command timing */
109 pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
110 (cs5520_pio_clocks[pio].recovery << 4) |
111 (cs5520_pio_clocks[pio].assert));
113 /* Set the DMA enable/disable flag */
114 reg = inb(hwif->dma_base + 0x02 + 8*controller);
115 reg |= 1<<((drive->dn&1)+5);
116 outb(reg, hwif->dma_base + 0x02 + 8*controller);
118 error = ide_config_drive_speed(drive, speed);
119 /* ATAPI is harder so leave it for now */
120 if(!error && drive->media == ide_disk)
121 error = hwif->ide_dma_on(drive);
126 static void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
128 cs5520_tune_chipset(drive, XFER_PIO_0 + pio);
131 static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
133 /* Tune the drive for PIO modes up to PIO 4 */
134 ide_set_max_pio(drive);
136 /* Then tell the core to use DMA operations */
141 * We provide a callback for our nonstandard DMA location
144 static void __devinit cs5520_init_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
146 unsigned long bmide = pci_resource_start(dev, 2); /* Not the usual 4 */
147 if(hwif->mate && hwif->mate->dma_base) /* Second channel at primary + 8 */
149 ide_setup_dma(hwif, bmide, 8);
153 * We wrap the DMA activate to set the vdma flag. This is needed
154 * so that the IDE DMA layer issues PIO not DMA commands over the
158 static int cs5520_dma_on(ide_drive_t *drive)
164 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
166 hwif->set_pio_mode = &cs5520_set_pio_mode;
167 hwif->speedproc = &cs5520_tune_chipset;
168 hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
169 hwif->ide_dma_on = &cs5520_dma_on;
176 hwif->drives[0].autotune = 1;
177 hwif->drives[1].autotune = 1;
182 hwif->ultra_mask = 0;
183 hwif->swdma_mask = 0;
184 hwif->mwdma_mask = 0;
186 hwif->drives[0].autodma = hwif->autodma;
187 hwif->drives[1].autodma = hwif->autodma;
190 #define DECLARE_CS_DEV(name_str) \
193 .init_setup_dma = cs5520_init_setup_dma, \
194 .init_hwif = init_hwif_cs5520, \
195 .autodma = AUTODMA, \
196 .bootable = ON_BOARD, \
197 .host_flags = IDE_HFLAG_ISA_PORTS, \
198 .pio_mask = ATA_PIO4, \
201 static ide_pci_device_t cyrix_chipsets[] __devinitdata = {
202 /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
203 /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
207 * The 5510/5520 are a bit weird. They don't quite set up the way
208 * the PCI helper layer expects so we must do much of the set up
212 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
214 ide_hwif_t *hwif = NULL, *mate = NULL;
216 ide_pci_device_t *d = &cyrix_chipsets[id->driver_data];
218 ide_setup_pci_noise(dev, d);
220 /* We must not grab the entire device, it has 'ISA' space in its
221 BARS too and we will freak out other bits of the kernel */
222 if (pci_enable_device_bars(dev, 1<<2)) {
223 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
227 if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
228 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
235 * Now the chipset is configured we can let the core
236 * do all the device setup for us
239 ide_pci_setup_ports(dev, d, 14, &index);
241 if ((index.b.low & 0xf0) != 0xf0)
242 hwif = &ide_hwifs[index.b.low];
243 if ((index.b.high & 0xf0) != 0xf0)
244 mate = &ide_hwifs[index.b.high];
247 probe_hwif_init(hwif);
249 probe_hwif_init(mate);
252 ide_proc_register_port(hwif);
254 ide_proc_register_port(mate);
259 static struct pci_device_id cs5520_pci_tbl[] = {
260 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
261 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
264 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
266 static struct pci_driver driver = {
268 .id_table = cs5520_pci_tbl,
269 .probe = cs5520_init_one,
272 static int __init cs5520_ide_init(void)
274 return ide_pci_register_driver(&driver);
277 module_init(cs5520_ide_init);
279 MODULE_AUTHOR("Alan Cox");
280 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
281 MODULE_LICENSE("GPL");