2 * Copyright (C) 2000 Andre Hedrick <andre@linux-ide.org>
3 * Copyright (C) 2000 Mark Lord <mlord@pobox.com>
4 * Copyright (C) 2007 Bartlomiej Zolnierkiewicz
6 * May be copied or modified under the terms of the GNU General Public License
8 * Development of this chipset driver was funded
9 * by the nice folks at National Semiconductor.
12 * CS5530 documentation available from National Semiconductor.
15 #include <linux/module.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
18 #include <linux/hdreg.h>
19 #include <linux/pci.h>
20 #include <linux/init.h>
21 #include <linux/ide.h>
26 * Here are the standard PIO mode 0-4 timings for each "format".
27 * Format-0 uses fast data reg timings, with slower command reg timings.
28 * Format-1 uses fast timings for all registers, but won't work with all drives.
30 static unsigned int cs5530_pio_timings[2][5] = {
31 {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
32 {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
36 * After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
38 #define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
39 #define CS5530_BASEREG(hwif) (((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))
42 * cs5530_set_pio_mode - set host controller for PIO mode
44 * @pio: PIO mode number
46 * Handles setting of PIO mode for the chipset.
48 * The init_hwif_cs5530() routine guarantees that all drives
49 * will have valid default PIO timings set up before we get here.
52 static void cs5530_set_pio_mode(ide_drive_t *drive, const u8 pio)
54 unsigned long basereg = CS5530_BASEREG(drive->hwif);
55 unsigned int format = (inl(basereg + 4) >> 31) & 1;
57 outl(cs5530_pio_timings[format][pio], basereg + ((drive->dn & 1)<<3));
61 * cs5530_udma_filter - UDMA filter
64 * cs5530_udma_filter() does UDMA mask filtering for the given drive
65 * taking into the consideration capabilities of the mate device.
67 * The CS5530 specifies that two drives sharing a cable cannot mix
68 * UDMA/MDMA. It has to be one or the other, for the pair, though
69 * different timings can still be chosen for each drive. We could
70 * set the appropriate timing bits on the fly, but that might be
71 * a bit confusing. So, for now we statically handle this requirement
72 * by looking at our mate drive to see what it is capable of, before
73 * choosing a mode for our own drive.
75 * Note: This relies on the fact we never fail from UDMA to MWDMA2
76 * but instead drop to PIO.
79 static u8 cs5530_udma_filter(ide_drive_t *drive)
81 ide_hwif_t *hwif = drive->hwif;
82 ide_drive_t *mate = &hwif->drives[(drive->dn & 1) ^ 1];
83 struct hd_driveid *mateid = mate->id;
84 u8 mask = hwif->ultra_mask;
86 if (mate->present == 0)
89 if ((mateid->capability & 1) && __ide_dma_bad_drive(mate) == 0) {
90 if ((mateid->field_valid & 4) && (mateid->dma_ultra & 7))
92 if ((mateid->field_valid & 2) && (mateid->dma_mword & 7))
99 static void cs5530_set_dma_mode(ide_drive_t *drive, const u8 mode)
101 unsigned long basereg;
102 unsigned int reg, timings = 0;
105 case XFER_UDMA_0: timings = 0x00921250; break;
106 case XFER_UDMA_1: timings = 0x00911140; break;
107 case XFER_UDMA_2: timings = 0x00911030; break;
108 case XFER_MW_DMA_0: timings = 0x00077771; break;
109 case XFER_MW_DMA_1: timings = 0x00012121; break;
110 case XFER_MW_DMA_2: timings = 0x00002020; break;
112 basereg = CS5530_BASEREG(drive->hwif);
113 reg = inl(basereg + 4); /* get drive0 config register */
114 timings |= reg & 0x80000000; /* preserve PIO format bit */
115 if ((drive-> dn & 1) == 0) { /* are we configuring drive0? */
116 outl(timings, basereg + 4); /* write drive0 config register */
118 if (timings & 0x00100000)
119 reg |= 0x00100000; /* enable UDMA timings for both drives */
121 reg &= ~0x00100000; /* disable UDMA timings for both drives */
122 outl(reg, basereg + 4); /* write drive0 config register */
123 outl(timings, basereg + 12); /* write drive1 config register */
128 * init_chipset_5530 - set up 5530 bridge
132 * Initialize the cs5530 bridge for reliable IDE DMA operation.
135 static unsigned int __devinit init_chipset_cs5530 (struct pci_dev *dev, const char *name)
137 struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
139 if (pci_resource_start(dev, 4) == 0)
143 while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
144 switch (dev->device) {
145 case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
146 master_0 = pci_dev_get(dev);
148 case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
149 cs5530_0 = pci_dev_get(dev);
154 printk(KERN_ERR "%s: unable to locate PCI MASTER function\n", name);
158 printk(KERN_ERR "%s: unable to locate CS5530 LEGACY function\n", name);
163 * Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
164 * --> OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
167 pci_set_master(cs5530_0);
168 pci_try_set_mwi(cs5530_0);
171 * Set PCI CacheLineSize to 16-bytes:
172 * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
175 pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
178 * Disable trapping of UDMA register accesses (Win98 hack):
179 * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
182 pci_write_config_word(cs5530_0, 0xd0, 0x5006);
185 * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
186 * The other settings are what is necessary to get the register
187 * into a sane state for IDE DMA operation.
190 pci_write_config_byte(master_0, 0x40, 0x1e);
193 * Set max PCI burst size (16-bytes seems to work best):
194 * 16bytes: set bit-1 at 0x41 (reg value of 0x16)
195 * all others: clear bit-1 at 0x41, and do:
196 * 128bytes: OR 0x00 at 0x41
197 * 256bytes: OR 0x04 at 0x41
198 * 512bytes: OR 0x08 at 0x41
199 * 1024bytes: OR 0x0c at 0x41
202 pci_write_config_byte(master_0, 0x41, 0x14);
205 * These settings are necessary to get the chip
206 * into a sane state for IDE DMA operation.
209 pci_write_config_byte(master_0, 0x42, 0x00);
210 pci_write_config_byte(master_0, 0x43, 0xc1);
213 pci_dev_put(master_0);
214 pci_dev_put(cs5530_0);
219 * init_hwif_cs5530 - initialise an IDE channel
220 * @hwif: IDE to initialize
222 * This gets invoked by the IDE driver once for each channel. It
223 * performs channel-specific pre-initialization before drive probing.
226 static void __devinit init_hwif_cs5530 (ide_hwif_t *hwif)
228 unsigned long basereg;
231 hwif->set_pio_mode = &cs5530_set_pio_mode;
232 hwif->set_dma_mode = &cs5530_set_dma_mode;
234 basereg = CS5530_BASEREG(hwif);
235 d0_timings = inl(basereg + 0);
236 if (CS5530_BAD_PIO(d0_timings))
237 outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 0);
238 if (CS5530_BAD_PIO(inl(basereg + 8)))
239 outl(cs5530_pio_timings[(d0_timings >> 31) & 1][0], basereg + 8);
241 if (hwif->dma_base == 0)
244 hwif->udma_filter = cs5530_udma_filter;
247 static const struct ide_port_info cs5530_chipset __devinitdata = {
249 .init_chipset = init_chipset_cs5530,
250 .init_hwif = init_hwif_cs5530,
251 .host_flags = IDE_HFLAG_SERIALIZE |
252 IDE_HFLAG_POST_SET_MODE |
254 .pio_mask = ATA_PIO4,
255 .mwdma_mask = ATA_MWDMA2,
256 .udma_mask = ATA_UDMA2,
259 static int __devinit cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)
261 return ide_setup_pci_device(dev, &cs5530_chipset);
264 static const struct pci_device_id cs5530_pci_tbl[] = {
265 { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), 0 },
268 MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl);
270 static struct pci_driver driver = {
271 .name = "CS5530 IDE",
272 .id_table = cs5530_pci_tbl,
273 .probe = cs5530_init_one,
276 static int __init cs5530_ide_init(void)
278 return ide_pci_register_driver(&driver);
281 module_init(cs5530_ide_init);
283 MODULE_AUTHOR("Mark Lord");
284 MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE");
285 MODULE_LICENSE("GPL");