root/drivers/ide/cs5530.c

DEFINITIONS

1. cs5530_set_pio_mode
2. cs5530_udma_filter
3. cs5530_set_dma_mode
4. init_chipset_cs5530
5. init_hwif_cs5530
6. cs5530_init_one
7. cs5530_ide_init
8. cs5530_ide_exit

   1 /*
   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
   5  *
   6  * May be copied or modified under the terms of the GNU General Public License
   7  *
   8  * Development of this chipset driver was funded
   9  * by the nice folks at National Semiconductor.
  10  *
  11  * Documentation:
  12  *      CS5530 documentation available from National Semiconductor.
  13  */
  14 
  15 #include <linux/module.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/ide.h>
  21 
  22 #include <asm/io.h>
  23 
  24 #define DRV_NAME "cs5530"
  25 
  26 /*
  27  * Here are the standard PIO mode 0-4 timings for each "format".
  28  * Format-0 uses fast data reg timings, with slower command reg timings.
  29  * Format-1 uses fast timings for all registers, but won't work with all drives.
  30  */
  31 static unsigned int cs5530_pio_timings[2][5] = {
  32         {0x00009172, 0x00012171, 0x00020080, 0x00032010, 0x00040010},
  33         {0xd1329172, 0x71212171, 0x30200080, 0x20102010, 0x00100010}
  34 };
  35 
  36 /*
  37  * After chip reset, the PIO timings are set to 0x0000e132, which is not valid.
  38  */
  39 #define CS5530_BAD_PIO(timings) (((timings)&~0x80000000)==0x0000e132)
  40 #define CS5530_BASEREG(hwif)    (((hwif)->dma_base & ~0xf) + ((hwif)->channel ? 0x30 : 0x20))
  41 
  42 /**
  43  *      cs5530_set_pio_mode     -       set host controller for PIO mode
  44  *      @hwif: port
  45  *      @drive: drive
  46  *
  47  *      Handles setting of PIO mode for the chipset.
  48  *
  49  *      The init_hwif_cs5530() routine guarantees that all drives
  50  *      will have valid default PIO timings set up before we get here.
  51  */
  52 
  53 static void cs5530_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
  54 {
  55         unsigned long basereg = CS5530_BASEREG(hwif);
  56         unsigned int format = (inl(basereg + 4) >> 31) & 1;
  57         const u8 pio = drive->pio_mode - XFER_PIO_0;
  58 
  59         outl(cs5530_pio_timings[format][pio], basereg + ((drive->dn & 1)<<3));
  60 }
  61 
  62 /**
  63  *      cs5530_udma_filter      -       UDMA filter
  64  *      @drive: drive
  65  *
  66  *      cs5530_udma_filter() does UDMA mask filtering for the given drive
  67  *      taking into the consideration capabilities of the mate device.
  68  *
  69  *      The CS5530 specifies that two drives sharing a cable cannot mix
  70  *      UDMA/MDMA.  It has to be one or the other, for the pair, though
  71  *      different timings can still be chosen for each drive.  We could
  72  *      set the appropriate timing bits on the fly, but that might be
  73  *      a bit confusing.  So, for now we statically handle this requirement
  74  *      by looking at our mate drive to see what it is capable of, before
  75  *      choosing a mode for our own drive.
  76  *
  77  *      Note: This relies on the fact we never fail from UDMA to MWDMA2
  78  *      but instead drop to PIO.
  79  */
  80 
  81 static u8 cs5530_udma_filter(ide_drive_t *drive)
  82 {
  83         ide_hwif_t *hwif = drive->hwif;
  84         ide_drive_t *mate = ide_get_pair_dev(drive);
  85         u16 *mateid;
  86         u8 mask = hwif->ultra_mask;
  87 
  88         if (mate == NULL)
  89                 goto out;
  90         mateid = mate->id;
  91 
  92         if (ata_id_has_dma(mateid) && __ide_dma_bad_drive(mate) == 0) {
  93                 if ((mateid[ATA_ID_FIELD_VALID] & 4) &&
  94                     (mateid[ATA_ID_UDMA_MODES] & 7))
  95                         goto out;
  96                 if (mateid[ATA_ID_MWDMA_MODES] & 7)
  97                         mask = 0;
  98         }
  99 out:
 100         return mask;
 101 }
 102 
 103 static void cs5530_set_dma_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 104 {
 105         unsigned long basereg;
 106         unsigned int reg, timings = 0;
 107 
 108         switch (drive->dma_mode) {
 109                 case XFER_UDMA_0:       timings = 0x00921250; break;
 110                 case XFER_UDMA_1:       timings = 0x00911140; break;
 111                 case XFER_UDMA_2:       timings = 0x00911030; break;
 112                 case XFER_MW_DMA_0:     timings = 0x00077771; break;
 113                 case XFER_MW_DMA_1:     timings = 0x00012121; break;
 114                 case XFER_MW_DMA_2:     timings = 0x00002020; break;
 115         }
 116         basereg = CS5530_BASEREG(hwif);
 117         reg = inl(basereg + 4);                 /* get drive0 config register */
 118         timings |= reg & 0x80000000;            /* preserve PIO format bit */
 119         if ((drive-> dn & 1) == 0) {            /* are we configuring drive0? */
 120                 outl(timings, basereg + 4);     /* write drive0 config register */
 121         } else {
 122                 if (timings & 0x00100000)
 123                         reg |=  0x00100000;     /* enable UDMA timings for both drives */
 124                 else
 125                         reg &= ~0x00100000;     /* disable UDMA timings for both drives */
 126                 outl(reg, basereg + 4);         /* write drive0 config register */
 127                 outl(timings, basereg + 12);    /* write drive1 config register */
 128         }
 129 }
 130 
 131 /**
 132  *      init_chipset_5530       -       set up 5530 bridge
 133  *      @dev: PCI device
 134  *
 135  *      Initialize the cs5530 bridge for reliable IDE DMA operation.
 136  */
 137 
 138 static int init_chipset_cs5530(struct pci_dev *dev)
 139 {
 140         struct pci_dev *master_0 = NULL, *cs5530_0 = NULL;
 141 
 142         if (pci_resource_start(dev, 4) == 0)
 143                 return -EFAULT;
 144 
 145         dev = NULL;
 146         while ((dev = pci_get_device(PCI_VENDOR_ID_CYRIX, PCI_ANY_ID, dev)) != NULL) {
 147                 switch (dev->device) {
 148                         case PCI_DEVICE_ID_CYRIX_PCI_MASTER:
 149                                 master_0 = pci_dev_get(dev);
 150                                 break;
 151                         case PCI_DEVICE_ID_CYRIX_5530_LEGACY:
 152                                 cs5530_0 = pci_dev_get(dev);
 153                                 break;
 154                 }
 155         }
 156         if (!master_0) {
 157                 printk(KERN_ERR DRV_NAME ": unable to locate PCI MASTER function\n");
 158                 goto out;
 159         }
 160         if (!cs5530_0) {
 161                 printk(KERN_ERR DRV_NAME ": unable to locate CS5530 LEGACY function\n");
 162                 goto out;
 163         }
 164 
 165         /*
 166          * Enable BusMaster and MemoryWriteAndInvalidate for the cs5530:
 167          * -->  OR 0x14 into 16-bit PCI COMMAND reg of function 0 of the cs5530
 168          */
 169 
 170         pci_set_master(cs5530_0);
 171         pci_try_set_mwi(cs5530_0);
 172 
 173         /*
 174          * Set PCI CacheLineSize to 16-bytes:
 175          * --> Write 0x04 into 8-bit PCI CACHELINESIZE reg of function 0 of the cs5530
 176          */
 177 
 178         pci_write_config_byte(cs5530_0, PCI_CACHE_LINE_SIZE, 0x04);
 179 
 180         /*
 181          * Disable trapping of UDMA register accesses (Win98 hack):
 182          * --> Write 0x5006 into 16-bit reg at offset 0xd0 of function 0 of the cs5530
 183          */
 184 
 185         pci_write_config_word(cs5530_0, 0xd0, 0x5006);
 186 
 187         /*
 188          * Bit-1 at 0x40 enables MemoryWriteAndInvalidate on internal X-bus:
 189          * The other settings are what is necessary to get the register
 190          * into a sane state for IDE DMA operation.
 191          */
 192 
 193         pci_write_config_byte(master_0, 0x40, 0x1e);
 194 
 195         /* 
 196          * Set max PCI burst size (16-bytes seems to work best):
 197          *         16bytes: set bit-1 at 0x41 (reg value of 0x16)
 198          *      all others: clear bit-1 at 0x41, and do:
 199          *        128bytes: OR 0x00 at 0x41
 200          *        256bytes: OR 0x04 at 0x41
 201          *        512bytes: OR 0x08 at 0x41
 202          *       1024bytes: OR 0x0c at 0x41
 203          */
 204 
 205         pci_write_config_byte(master_0, 0x41, 0x14);
 206 
 207         /*
 208          * These settings are necessary to get the chip
 209          * into a sane state for IDE DMA operation.
 210          */
 211 
 212         pci_write_config_byte(master_0, 0x42, 0x00);
 213         pci_write_config_byte(master_0, 0x43, 0xc1);
 214 
 215 out:
 216         pci_dev_put(master_0);
 217         pci_dev_put(cs5530_0);
 218         return 0;
 219 }
 220 
 221 /**
 222  *      init_hwif_cs5530        -       initialise an IDE channel
 223  *      @hwif: IDE to initialize
 224  *
 225  *      This gets invoked by the IDE driver once for each channel. It
 226  *      performs channel-specific pre-initialization before drive probing.
 227  */
 228 
 229 static void init_hwif_cs5530 (ide_hwif_t *hwif)
 230 {
 231         unsigned long basereg;
 232         u32 d0_timings;
 233 
 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);
 240 }
 241 
 242 static const struct ide_port_ops cs5530_port_ops = {
 243         .set_pio_mode           = cs5530_set_pio_mode,
 244         .set_dma_mode           = cs5530_set_dma_mode,
 245         .udma_filter            = cs5530_udma_filter,
 246 };
 247 
 248 static const struct ide_port_info cs5530_chipset = {
 249         .name           = DRV_NAME,
 250         .init_chipset   = init_chipset_cs5530,
 251         .init_hwif      = init_hwif_cs5530,
 252         .port_ops       = &cs5530_port_ops,
 253         .host_flags     = IDE_HFLAG_SERIALIZE |
 254                           IDE_HFLAG_POST_SET_MODE,
 255         .pio_mask       = ATA_PIO4,
 256         .mwdma_mask     = ATA_MWDMA2,
 257         .udma_mask      = ATA_UDMA2,
 258 };
 259 
 260 static int cs5530_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 261 {
 262         return ide_pci_init_one(dev, &cs5530_chipset, NULL);
 263 }
 264 
 265 static const struct pci_device_id cs5530_pci_tbl[] = {
 266         { PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5530_IDE), 0 },
 267         { 0, },
 268 };
 269 MODULE_DEVICE_TABLE(pci, cs5530_pci_tbl);
 270 
 271 static struct pci_driver cs5530_pci_driver = {
 272         .name           = "CS5530 IDE",
 273         .id_table       = cs5530_pci_tbl,
 274         .probe          = cs5530_init_one,
 275         .remove         = ide_pci_remove,
 276         .suspend        = ide_pci_suspend,
 277         .resume         = ide_pci_resume,
 278 };
 279 
 280 static int __init cs5530_ide_init(void)
 281 {
 282         return ide_pci_register_driver(&cs5530_pci_driver);
 283 }
 284 
 285 static void __exit cs5530_ide_exit(void)
 286 {
 287         pci_unregister_driver(&cs5530_pci_driver);
 288 }
 289 
 290 module_init(cs5530_ide_init);
 291 module_exit(cs5530_ide_exit);
 292 
 293 MODULE_AUTHOR("Mark Lord");
 294 MODULE_DESCRIPTION("PCI driver module for Cyrix/NS 5530 IDE");
 295 MODULE_LICENSE("GPL");