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 void cs5520_set_pio_mode(ide_drive_t *drive, const u8 pio)
71 ide_hwif_t *hwif = HWIF(drive);
72 struct pci_dev *pdev = hwif->pci_dev;
73 int controller = drive->dn > 1 ? 1 : 0;
76 /* FIXME: if DMA = 1 do we need to set the DMA bit here ? */
78 /* 8bit CAT/CRT - 8bit command timing for channel */
79 pci_write_config_byte(pdev, 0x62 + controller,
80 (cs5520_pio_clocks[pio].recovery << 4) |
81 (cs5520_pio_clocks[pio].assert));
83 /* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */
85 /* FIXME: should these use address ? */
86 /* Data read timing */
87 pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
88 (cs5520_pio_clocks[pio].recovery << 4) |
89 (cs5520_pio_clocks[pio].assert));
90 /* Write command timing */
91 pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
92 (cs5520_pio_clocks[pio].recovery << 4) |
93 (cs5520_pio_clocks[pio].assert));
95 /* Set the DMA enable/disable flag */
96 reg = inb(hwif->dma_base + 0x02 + 8*controller);
97 reg |= 1<<((drive->dn&1)+5);
98 outb(reg, hwif->dma_base + 0x02 + 8*controller);
100 (void)ide_config_drive_speed(drive, XFER_PIO_0 + pio);
103 static int cs5520_tune_chipset(ide_drive_t *drive, const u8 speed)
105 printk(KERN_ERR "cs55x0: bad ide timing.\n");
107 cs5520_set_pio_mode(drive, 0);
110 * FIXME: this is incorrect to return zero here but
111 * since all users of ide_set_xfer_rate() ignore
112 * the return value it is not a problem currently
117 static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
119 /* Tune the drive for PIO modes up to PIO 4 */
120 ide_set_max_pio(drive);
122 /* Then tell the core to use DMA operations */
127 * We provide a callback for our nonstandard DMA location
130 static void __devinit cs5520_init_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
132 unsigned long bmide = pci_resource_start(dev, 2); /* Not the usual 4 */
133 if(hwif->mate && hwif->mate->dma_base) /* Second channel at primary + 8 */
135 ide_setup_dma(hwif, bmide, 8);
139 * We wrap the DMA activate to set the vdma flag. This is needed
140 * so that the IDE DMA layer issues PIO not DMA commands over the
144 static int cs5520_dma_on(ide_drive_t *drive)
150 static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
152 hwif->set_pio_mode = &cs5520_set_pio_mode;
153 hwif->speedproc = &cs5520_tune_chipset;
154 hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
155 hwif->ide_dma_on = &cs5520_dma_on;
162 hwif->drives[0].autotune = 1;
163 hwif->drives[1].autotune = 1;
167 /* ATAPI is harder so leave it for now */
169 hwif->ultra_mask = 0;
170 hwif->swdma_mask = 0;
171 hwif->mwdma_mask = 0;
173 hwif->drives[0].autodma = hwif->autodma;
174 hwif->drives[1].autodma = hwif->autodma;
177 #define DECLARE_CS_DEV(name_str) \
180 .init_setup_dma = cs5520_init_setup_dma, \
181 .init_hwif = init_hwif_cs5520, \
182 .autodma = AUTODMA, \
183 .bootable = ON_BOARD, \
184 .host_flags = IDE_HFLAG_ISA_PORTS, \
185 .pio_mask = ATA_PIO4, \
188 static ide_pci_device_t cyrix_chipsets[] __devinitdata = {
189 /* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
190 /* 1 */ DECLARE_CS_DEV("Cyrix 5520")
194 * The 5510/5520 are a bit weird. They don't quite set up the way
195 * the PCI helper layer expects so we must do much of the set up
199 static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
201 ide_hwif_t *hwif = NULL, *mate = NULL;
203 ide_pci_device_t *d = &cyrix_chipsets[id->driver_data];
205 ide_setup_pci_noise(dev, d);
207 /* We must not grab the entire device, it has 'ISA' space in its
208 BARS too and we will freak out other bits of the kernel */
209 if (pci_enable_device_bars(dev, 1<<2)) {
210 printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
214 if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
215 printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
222 * Now the chipset is configured we can let the core
223 * do all the device setup for us
226 ide_pci_setup_ports(dev, d, 14, &index);
228 if ((index.b.low & 0xf0) != 0xf0)
229 hwif = &ide_hwifs[index.b.low];
230 if ((index.b.high & 0xf0) != 0xf0)
231 mate = &ide_hwifs[index.b.high];
234 probe_hwif_init(hwif);
236 probe_hwif_init(mate);
239 ide_proc_register_port(hwif);
241 ide_proc_register_port(mate);
246 static struct pci_device_id cs5520_pci_tbl[] = {
247 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
248 { PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
251 MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);
253 static struct pci_driver driver = {
255 .id_table = cs5520_pci_tbl,
256 .probe = cs5520_init_one,
259 static int __init cs5520_ide_init(void)
261 return ide_pci_register_driver(&driver);
264 module_init(cs5520_ide_init);
266 MODULE_AUTHOR("Alan Cox");
267 MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
268 MODULE_LICENSE("GPL");