kernel/2.6.29.6-aldebaran-rt/drivers/ide/cy82c693.c

   1 /*
   2  *  Copyright (C) 1998-2000 Andreas S. Krebs (akrebs@altavista.net), Maintainer
   3  *  Copyright (C) 1998-2002 Andre Hedrick <andre@linux-ide.org>, Integrator
   4  *
   5  * CYPRESS CY82C693 chipset IDE controller
   6  *
   7  * The CY82C693 chipset is used on Digital's PC-Alpha 164SX boards.
   8  * Writing the driver was quite simple, since most of the job is
   9  * done by the generic pci-ide support.
  10  * The hard part was finding the CY82C693's datasheet on Cypress's
  11  * web page :-(. But Altavista solved this problem :-).
  12  *
  13  *
  14  * Notes:
  15  * - I recently got a 16.8G IBM DTTA, so I was able to test it with
  16  *   a large and fast disk - the results look great, so I'd say the
  17  *   driver is working fine :-)
  18  *   hdparm -t reports 8.17 MB/sec at about 6% CPU usage for the DTTA
  19  * - this is my first linux driver, so there's probably a lot  of room
  20  *   for optimizations and bug fixing, so feel free to do it.
  21  * - if using PIO mode it's a good idea to set the PIO mode and
  22  *   32-bit I/O support (if possible), e.g. hdparm -p2 -c1 /dev/hda
  23  * - I had some problems with my IBM DHEA with PIO modes < 2
  24  *   (lost interrupts) ?????
  25  * - first tests with DMA look okay, they seem to work, but there is a
  26  *   problem with sound - the BusMaster IDE TimeOut should fixed this
  27  *
  28  * Ancient History:
  29  * AMH@1999-08-24: v0.34 init_cy82c693_chip moved to pci_init_cy82c693
  30  * ASK@1999-01-23: v0.33 made a few minor code clean ups
  31  *                       removed DMA clock speed setting by default
  32  *                       added boot message
  33  * ASK@1998-11-01: v0.32 added support to set BusMaster IDE TimeOut
  34  *                       added support to set DMA Controller Clock Speed
  35  * ASK@1998-10-31: v0.31 fixed problem with setting to high DMA modes
  36  *                       on some drives.
  37  * ASK@1998-10-29: v0.3 added support to set DMA modes
  38  * ASK@1998-10-28: v0.2 added support to set PIO modes
  39  * ASK@1998-10-27: v0.1 first version - chipset detection
  40  *
  41  */
  42
  43 #include <linux/module.h>
  44 #include <linux/types.h>
  45 #include <linux/pci.h>
  46 #include <linux/ide.h>
  47 #include <linux/init.h>
  48
  49 #include <asm/io.h>
  50
  51 #define DRV_NAME "cy82c693"
  52
  53 /*
  54  *      The following are used to debug the driver.
  55  */
  56 #define CY82C693_DEBUG_INFO     0
  57
  58 /*
  59  *      NOTE: the value for busmaster timeout is tricky and I got it by
  60  *      trial and error!  By using a to low value will cause DMA timeouts
  61  *      and drop IDE performance, and by using a to high value will cause
  62  *      audio playback to scatter.
  63  *      If you know a better value or how to calc it, please let me know.
  64  */
  65
  66 /* twice the value written in cy82c693ub datasheet */
  67 #define BUSMASTER_TIMEOUT       0x50
  68 /*
  69  * the value above was tested on my machine and it seems to work okay
  70  */
  71
  72 /* here are the offset definitions for the registers */
  73 #define CY82_IDE_CMDREG         0x04
  74 #define CY82_IDE_ADDRSETUP      0x48
  75 #define CY82_IDE_MASTER_IOR     0x4C
  76 #define CY82_IDE_MASTER_IOW     0x4D
  77 #define CY82_IDE_SLAVE_IOR      0x4E
  78 #define CY82_IDE_SLAVE_IOW      0x4F
  79 #define CY82_IDE_MASTER_8BIT    0x50
  80 #define CY82_IDE_SLAVE_8BIT     0x51
  81
  82 #define CY82_INDEX_PORT         0x22
  83 #define CY82_DATA_PORT          0x23
  84
  85 #define CY82_INDEX_CHANNEL0     0x30
  86 #define CY82_INDEX_CHANNEL1     0x31
  87 #define CY82_INDEX_TIMEOUT      0x32
  88
  89 /* the min and max PCI bus speed in MHz - from datasheet */
  90 #define CY82C963_MIN_BUS_SPEED  25
  91 #define CY82C963_MAX_BUS_SPEED  33
  92
  93 /* the struct for the PIO mode timings */
  94 typedef struct pio_clocks_s {
  95         u8      address_time;   /* Address setup (clocks) */
  96         u8      time_16r;       /* clocks for 16bit IOR (0xF0=Active/data, 0x0F=Recovery) */
  97         u8      time_16w;       /* clocks for 16bit IOW (0xF0=Active/data, 0x0F=Recovery) */
  98         u8      time_8;         /* clocks for 8bit (0xF0=Active/data, 0x0F=Recovery) */
  99 } pio_clocks_t;
 100
 101 /*
 102  * calc clocks using bus_speed
 103  * returns (rounded up) time in bus clocks for time in ns
 104  */
 105 static int calc_clk(int time, int bus_speed)
 106 {
 107         int clocks;
 108
 109         clocks = (time*bus_speed+999)/1000 - 1;
 110
 111         if (clocks < 0)
 112                 clocks = 0;
 113
 114         if (clocks > 0x0F)
 115                 clocks = 0x0F;
 116
 117         return clocks;
 118 }
 119
 120 /*
 121  * compute the values for the clock registers for PIO
 122  * mode and pci_clk [MHz] speed
 123  *
 124  * NOTE: for mode 0,1 and 2 drives 8-bit IDE command control registers are used
 125  *       for mode 3 and 4 drives 8 and 16-bit timings are the same
 126  *
 127  */
 128 static void compute_clocks(u8 pio, pio_clocks_t *p_pclk)
 129 {
 130         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 131         int clk1, clk2;
 132         int bus_speed = ide_pci_clk ? ide_pci_clk : 33;
 133
 134         /* we don't check against CY82C693's min and max speed,
 135          * so you can play with the idebus=xx parameter
 136          */
 137
 138         /* let's calc the address setup time clocks */
 139         p_pclk->address_time = (u8)calc_clk(t->setup, bus_speed);
 140
 141         /* let's calc the active and recovery time clocks */
 142         clk1 = calc_clk(t->active, bus_speed);
 143
 144         /* calc recovery timing */
 145         clk2 = t->cycle - t->active - t->setup;
 146
 147         clk2 = calc_clk(clk2, bus_speed);
 148
 149         clk1 = (clk1<<4)|clk2;  /* combine active and recovery clocks */
 150
 151         /* note: we use the same values for 16bit IOR and IOW
 152          *      those are all the same, since I don't have other
 153          *      timings than those from ide-lib.c
 154          */
 155
 156         p_pclk->time_16r = (u8)clk1;
 157         p_pclk->time_16w = (u8)clk1;
 158
 159         /* what are good values for 8bit ?? */
 160         p_pclk->time_8 = (u8)clk1;
 161 }
 162
 163 /*
 164  * set DMA mode a specific channel for CY82C693
 165  */
 166
 167 static void cy82c693_set_dma_mode(ide_drive_t *drive, const u8 mode)
 168 {
 169         ide_hwif_t *hwif = drive->hwif;
 170         u8 single = (mode & 0x10) >> 4, index = 0, data = 0;
 171
 172         index = hwif->channel ? CY82_INDEX_CHANNEL1 : CY82_INDEX_CHANNEL0;
 173
 174         data = (mode & 3) | (single << 2);
 175
 176         outb(index, CY82_INDEX_PORT);
 177         outb(data, CY82_DATA_PORT);
 178
 179 #if CY82C693_DEBUG_INFO
 180         printk(KERN_INFO "%s (ch=%d, dev=%d): set DMA mode to %d (single=%d)\n",
 181                 drive->name, hwif->channel, drive->dn & 1, mode & 3, single);
 182 #endif /* CY82C693_DEBUG_INFO */
 183
 184         /*
 185          * note: below we set the value for Bus Master IDE TimeOut Register
 186          * I'm not absolutly sure what this does, but it solved my problem
 187          * with IDE DMA and sound, so I now can play sound and work with
 188          * my IDE driver at the same time :-)
 189          *
 190          * If you know the correct (best) value for this register please
 191          * let me know - ASK
 192          */
 193
 194         data = BUSMASTER_TIMEOUT;
 195         outb(CY82_INDEX_TIMEOUT, CY82_INDEX_PORT);
 196         outb(data, CY82_DATA_PORT);
 197
 198 #if CY82C693_DEBUG_INFO
 199         printk(KERN_INFO "%s: Set IDE Bus Master TimeOut Register to 0x%X\n",
 200                 drive->name, data);
 201 #endif /* CY82C693_DEBUG_INFO */
 202 }
 203
 204 static void cy82c693_set_pio_mode(ide_drive_t *drive, const u8 pio)
 205 {
 206         ide_hwif_t *hwif = drive->hwif;
 207         struct pci_dev *dev = to_pci_dev(hwif->dev);
 208         pio_clocks_t pclk;
 209         unsigned int addrCtrl;
 210
 211         /* select primary or secondary channel */
 212         if (hwif->index > 0) {  /* drive is on the secondary channel */
 213                 dev = pci_get_slot(dev->bus, dev->devfn+1);
 214                 if (!dev) {
 215                         printk(KERN_ERR "%s: tune_drive: "
 216                                 "Cannot find secondary interface!\n",
 217                                 drive->name);
 218                         return;
 219                 }
 220         }
 221
 222         /* let's calc the values for this PIO mode */
 223         compute_clocks(pio, &pclk);
 224
 225         /* now let's write  the clocks registers */
 226         if ((drive->dn & 1) == 0) {
 227                 /*
 228                  * set master drive
 229                  * address setup control register
 230                  * is 32 bit !!!
 231                  */
 232                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
 233
 234                 addrCtrl &= (~0xF);
 235                 addrCtrl |= (unsigned int)pclk.address_time;
 236                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
 237
 238                 /* now let's set the remaining registers */
 239                 pci_write_config_byte(dev, CY82_IDE_MASTER_IOR, pclk.time_16r);
 240                 pci_write_config_byte(dev, CY82_IDE_MASTER_IOW, pclk.time_16w);
 241                 pci_write_config_byte(dev, CY82_IDE_MASTER_8BIT, pclk.time_8);
 242
 243                 addrCtrl &= 0xF;
 244         } else {
 245                 /*
 246                  * set slave drive
 247                  * address setup control register
 248                  * is 32 bit !!!
 249                  */
 250                 pci_read_config_dword(dev, CY82_IDE_ADDRSETUP, &addrCtrl);
 251
 252                 addrCtrl &= (~0xF0);
 253                 addrCtrl |= ((unsigned int)pclk.address_time<<4);
 254                 pci_write_config_dword(dev, CY82_IDE_ADDRSETUP, addrCtrl);
 255
 256                 /* now let's set the remaining registers */
 257                 pci_write_config_byte(dev, CY82_IDE_SLAVE_IOR, pclk.time_16r);
 258                 pci_write_config_byte(dev, CY82_IDE_SLAVE_IOW, pclk.time_16w);
 259                 pci_write_config_byte(dev, CY82_IDE_SLAVE_8BIT, pclk.time_8);
 260
 261                 addrCtrl >>= 4;
 262                 addrCtrl &= 0xF;
 263         }
 264
 265 #if CY82C693_DEBUG_INFO
 266         printk(KERN_INFO "%s (ch=%d, dev=%d): set PIO timing to "
 267                 "(addr=0x%X, ior=0x%X, iow=0x%X, 8bit=0x%X)\n",
 268                 drive->name, hwif->channel, drive->dn & 1,
 269                 addrCtrl, pclk.time_16r, pclk.time_16w, pclk.time_8);
 270 #endif /* CY82C693_DEBUG_INFO */
 271 }
 272
 273 static void __devinit init_iops_cy82c693(ide_hwif_t *hwif)
 274 {
 275         static ide_hwif_t *primary;
 276         struct pci_dev *dev = to_pci_dev(hwif->dev);
 277
 278         if (PCI_FUNC(dev->devfn) == 1)
 279                 primary = hwif;
 280         else {
 281                 hwif->mate = primary;
 282                 hwif->channel = 1;
 283         }
 284 }
 285
 286 static const struct ide_port_ops cy82c693_port_ops = {
 287         .set_pio_mode           = cy82c693_set_pio_mode,
 288         .set_dma_mode           = cy82c693_set_dma_mode,
 289 };
 290
 291 static const struct ide_port_info cy82c693_chipset __devinitdata = {
 292         .name           = DRV_NAME,
 293         .init_iops      = init_iops_cy82c693,
 294         .port_ops       = &cy82c693_port_ops,
 295         .host_flags     = IDE_HFLAG_SINGLE,
 296         .pio_mask       = ATA_PIO4,
 297         .swdma_mask     = ATA_SWDMA2,
 298         .mwdma_mask     = ATA_MWDMA2,
 299 };
 300
 301 static int __devinit cy82c693_init_one(struct pci_dev *dev, const struct pci_device_id *id)
 302 {
 303         struct pci_dev *dev2;
 304         int ret = -ENODEV;
 305
 306         /* CY82C693 is more than only a IDE controller.
 307            Function 1 is primary IDE channel, function 2 - secondary. */
 308         if ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
 309             PCI_FUNC(dev->devfn) == 1) {
 310                 dev2 = pci_get_slot(dev->bus, dev->devfn + 1);
 311                 ret = ide_pci_init_two(dev, dev2, &cy82c693_chipset, NULL);
 312                 if (ret)
 313                         pci_dev_put(dev2);
 314         }
 315         return ret;
 316 }
 317
 318 static void __devexit cy82c693_remove(struct pci_dev *dev)
 319 {
 320         struct ide_host *host = pci_get_drvdata(dev);
 321         struct pci_dev *dev2 = host->dev[1] ? to_pci_dev(host->dev[1]) : NULL;
 322
 323         ide_pci_remove(dev);
 324         pci_dev_put(dev2);
 325 }
 326
 327 static const struct pci_device_id cy82c693_pci_tbl[] = {
 328         { PCI_VDEVICE(CONTAQ, PCI_DEVICE_ID_CONTAQ_82C693), 0 },
 329         { 0, },
 330 };
 331 MODULE_DEVICE_TABLE(pci, cy82c693_pci_tbl);
 332
 333 static struct pci_driver cy82c693_pci_driver = {
 334         .name           = "Cypress_IDE",
 335         .id_table       = cy82c693_pci_tbl,
 336         .probe          = cy82c693_init_one,
 337         .remove         = __devexit_p(cy82c693_remove),
 338         .suspend        = ide_pci_suspend,
 339         .resume         = ide_pci_resume,
 340 };
 341
 342 static int __init cy82c693_ide_init(void)
 343 {
 344         return ide_pci_register_driver(&cy82c693_pci_driver);
 345 }
 346
 347 static void __exit cy82c693_ide_exit(void)
 348 {
 349         pci_unregister_driver(&cy82c693_pci_driver);
 350 }
 351
 352 module_init(cy82c693_ide_init);
 353 module_exit(cy82c693_ide_exit);
 354
 355 MODULE_AUTHOR("Andreas Krebs, Andre Hedrick");
 356 MODULE_DESCRIPTION("PCI driver module for the Cypress CY82C693 IDE");
 357 MODULE_LICENSE("GPL");