root/drivers/ata/pata_efar.c

DEFINITIONS

1. efar_pre_reset
2. efar_cable_detect
3. efar_set_piomode
4. efar_set_dmamode
5. efar_init_one

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *    pata_efar.c - EFAR PIIX clone controller driver
   4  *
   5  *      (C) 2005 Red Hat
   6  *      (C) 2009-2010 Bartlomiej Zolnierkiewicz
   7  *
   8  *    Some parts based on ata_piix.c by Jeff Garzik and others.
   9  *
  10  *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
  11  *    Intel ICH controllers the EFAR widened the UDMA mode register bits
  12  *    and doesn't require the funky clock selection.
  13  */
  14 
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/blkdev.h>
  19 #include <linux/delay.h>
  20 #include <linux/device.h>
  21 #include <scsi/scsi_host.h>
  22 #include <linux/libata.h>
  23 #include <linux/ata.h>
  24 
  25 #define DRV_NAME        "pata_efar"
  26 #define DRV_VERSION     "0.4.5"
  27 
  28 /**
  29  *      efar_pre_reset  -       Enable bits
  30  *      @link: ATA link
  31  *      @deadline: deadline jiffies for the operation
  32  *
  33  *      Perform cable detection for the EFAR ATA interface. This is
  34  *      different to the PIIX arrangement
  35  */
  36 
  37 static int efar_pre_reset(struct ata_link *link, unsigned long deadline)
  38 {
  39         static const struct pci_bits efar_enable_bits[] = {
  40                 { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */
  41                 { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */
  42         };
  43         struct ata_port *ap = link->ap;
  44         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  45 
  46         if (!pci_test_config_bits(pdev, &efar_enable_bits[ap->port_no]))
  47                 return -ENOENT;
  48 
  49         return ata_sff_prereset(link, deadline);
  50 }
  51 
  52 /**
  53  *      efar_cable_detect       -       check for 40/80 pin
  54  *      @ap: Port
  55  *
  56  *      Perform cable detection for the EFAR ATA interface. This is
  57  *      different to the PIIX arrangement
  58  */
  59 
  60 static int efar_cable_detect(struct ata_port *ap)
  61 {
  62         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  63         u8 tmp;
  64 
  65         pci_read_config_byte(pdev, 0x47, &tmp);
  66         if (tmp & (2 >> ap->port_no))
  67                 return ATA_CBL_PATA40;
  68         return ATA_CBL_PATA80;
  69 }
  70 
  71 static DEFINE_SPINLOCK(efar_lock);
  72 
  73 /**
  74  *      efar_set_piomode - Initialize host controller PATA PIO timings
  75  *      @ap: Port whose timings we are configuring
  76  *      @adev: Device to program
  77  *
  78  *      Set PIO mode for device, in host controller PCI config space.
  79  *
  80  *      LOCKING:
  81  *      None (inherited from caller).
  82  */
  83 
  84 static void efar_set_piomode (struct ata_port *ap, struct ata_device *adev)
  85 {
  86         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  87         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  88         unsigned int master_port = ap->port_no ? 0x42 : 0x40;
  89         unsigned long flags;
  90         u16 master_data;
  91         u8 udma_enable;
  92         int control = 0;
  93 
  94         /*
  95          *      See Intel Document 298600-004 for the timing programing rules
  96          *      for PIIX/ICH. The EFAR is a clone so very similar
  97          */
  98 
  99         static const     /* ISP  RTC */
 100         u8 timings[][2] = { { 0, 0 },
 101                             { 0, 0 },
 102                             { 1, 0 },
 103                             { 2, 1 },
 104                             { 2, 3 }, };
 105 
 106         if (pio > 1)
 107                 control |= 1;   /* TIME */
 108         if (ata_pio_need_iordy(adev))   /* PIO 3/4 require IORDY */
 109                 control |= 2;   /* IE */
 110         /* Intel specifies that the prefetch/posting is for disk only */
 111         if (adev->class == ATA_DEV_ATA)
 112                 control |= 4;   /* PPE */
 113 
 114         spin_lock_irqsave(&efar_lock, flags);
 115 
 116         pci_read_config_word(dev, master_port, &master_data);
 117 
 118         /* Set PPE, IE, and TIME as appropriate */
 119         if (adev->devno == 0) {
 120                 master_data &= 0xCCF0;
 121                 master_data |= control;
 122                 master_data |= (timings[pio][0] << 12) |
 123                         (timings[pio][1] << 8);
 124         } else {
 125                 int shift = 4 * ap->port_no;
 126                 u8 slave_data;
 127 
 128                 master_data &= 0xFF0F;
 129                 master_data |= (control << 4);
 130 
 131                 /* Slave timing in separate register */
 132                 pci_read_config_byte(dev, 0x44, &slave_data);
 133                 slave_data &= ap->port_no ? 0x0F : 0xF0;
 134                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << shift;
 135                 pci_write_config_byte(dev, 0x44, slave_data);
 136         }
 137 
 138         master_data |= 0x4000;  /* Ensure SITRE is set */
 139         pci_write_config_word(dev, master_port, master_data);
 140 
 141         pci_read_config_byte(dev, 0x48, &udma_enable);
 142         udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
 143         pci_write_config_byte(dev, 0x48, udma_enable);
 144         spin_unlock_irqrestore(&efar_lock, flags);
 145 }
 146 
 147 /**
 148  *      efar_set_dmamode - Initialize host controller PATA DMA timings
 149  *      @ap: Port whose timings we are configuring
 150  *      @adev: Device to program
 151  *
 152  *      Set UDMA/MWDMA mode for device, in host controller PCI config space.
 153  *
 154  *      LOCKING:
 155  *      None (inherited from caller).
 156  */
 157 
 158 static void efar_set_dmamode (struct ata_port *ap, struct ata_device *adev)
 159 {
 160         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 161         u8 master_port          = ap->port_no ? 0x42 : 0x40;
 162         u16 master_data;
 163         u8 speed                = adev->dma_mode;
 164         int devid               = adev->devno + 2 * ap->port_no;
 165         unsigned long flags;
 166         u8 udma_enable;
 167 
 168         static const     /* ISP  RTC */
 169         u8 timings[][2] = { { 0, 0 },
 170                             { 0, 0 },
 171                             { 1, 0 },
 172                             { 2, 1 },
 173                             { 2, 3 }, };
 174 
 175         spin_lock_irqsave(&efar_lock, flags);
 176 
 177         pci_read_config_word(dev, master_port, &master_data);
 178         pci_read_config_byte(dev, 0x48, &udma_enable);
 179 
 180         if (speed >= XFER_UDMA_0) {
 181                 unsigned int udma       = adev->dma_mode - XFER_UDMA_0;
 182                 u16 udma_timing;
 183 
 184                 udma_enable |= (1 << devid);
 185 
 186                 /* Load the UDMA mode number */
 187                 pci_read_config_word(dev, 0x4A, &udma_timing);
 188                 udma_timing &= ~(7 << (4 * devid));
 189                 udma_timing |= udma << (4 * devid);
 190                 pci_write_config_word(dev, 0x4A, udma_timing);
 191         } else {
 192                 /*
 193                  * MWDMA is driven by the PIO timings. We must also enable
 194                  * IORDY unconditionally along with TIME1. PPE has already
 195                  * been set when the PIO timing was set.
 196                  */
 197                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 198                 unsigned int control;
 199                 u8 slave_data;
 200                 const unsigned int needed_pio[3] = {
 201                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 202                 };
 203                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 204 
 205                 control = 3;    /* IORDY|TIME1 */
 206 
 207                 /* If the drive MWDMA is faster than it can do PIO then
 208                    we must force PIO into PIO0 */
 209 
 210                 if (adev->pio_mode < needed_pio[mwdma])
 211                         /* Enable DMA timing only */
 212                         control |= 8;   /* PIO cycles in PIO0 */
 213 
 214                 if (adev->devno) {      /* Slave */
 215                         master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 216                         master_data |= control << 4;
 217                         pci_read_config_byte(dev, 0x44, &slave_data);
 218                         slave_data &= ap->port_no ? 0x0F : 0xF0;
 219                         /* Load the matching timing */
 220                         slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
 221                         pci_write_config_byte(dev, 0x44, slave_data);
 222                 } else {        /* Master */
 223                         master_data &= 0xCCF4;  /* Mask out IORDY|TIME1|DMAONLY
 224                                                    and master timing bits */
 225                         master_data |= control;
 226                         master_data |=
 227                                 (timings[pio][0] << 12) |
 228                                 (timings[pio][1] << 8);
 229                 }
 230                 udma_enable &= ~(1 << devid);
 231                 pci_write_config_word(dev, master_port, master_data);
 232         }
 233         pci_write_config_byte(dev, 0x48, udma_enable);
 234         spin_unlock_irqrestore(&efar_lock, flags);
 235 }
 236 
 237 static struct scsi_host_template efar_sht = {
 238         ATA_BMDMA_SHT(DRV_NAME),
 239 };
 240 
 241 static struct ata_port_operations efar_ops = {
 242         .inherits               = &ata_bmdma_port_ops,
 243         .cable_detect           = efar_cable_detect,
 244         .set_piomode            = efar_set_piomode,
 245         .set_dmamode            = efar_set_dmamode,
 246         .prereset               = efar_pre_reset,
 247 };
 248 
 249 
 250 /**
 251  *      efar_init_one - Register EFAR ATA PCI device with kernel services
 252  *      @pdev: PCI device to register
 253  *      @ent: Entry in efar_pci_tbl matching with @pdev
 254  *
 255  *      Called from kernel PCI layer.
 256  *
 257  *      LOCKING:
 258  *      Inherited from PCI layer (may sleep).
 259  *
 260  *      RETURNS:
 261  *      Zero on success, or -ERRNO value.
 262  */
 263 
 264 static int efar_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 265 {
 266         static const struct ata_port_info info = {
 267                 .flags          = ATA_FLAG_SLAVE_POSS,
 268                 .pio_mask       = ATA_PIO4,
 269                 .mwdma_mask     = ATA_MWDMA12_ONLY,
 270                 .udma_mask      = ATA_UDMA4,
 271                 .port_ops       = &efar_ops,
 272         };
 273         const struct ata_port_info *ppi[] = { &info, &info };
 274 
 275         ata_print_version_once(&pdev->dev, DRV_VERSION);
 276 
 277         return ata_pci_bmdma_init_one(pdev, ppi, &efar_sht, NULL,
 278                                       ATA_HOST_PARALLEL_SCAN);
 279 }
 280 
 281 static const struct pci_device_id efar_pci_tbl[] = {
 282         { PCI_VDEVICE(EFAR, 0x9130), },
 283 
 284         { }     /* terminate list */
 285 };
 286 
 287 static struct pci_driver efar_pci_driver = {
 288         .name                   = DRV_NAME,
 289         .id_table               = efar_pci_tbl,
 290         .probe                  = efar_init_one,
 291         .remove                 = ata_pci_remove_one,
 292 #ifdef CONFIG_PM_SLEEP
 293         .suspend                = ata_pci_device_suspend,
 294         .resume                 = ata_pci_device_resume,
 295 #endif
 296 };
 297 
 298 module_pci_driver(efar_pci_driver);
 299 
 300 MODULE_AUTHOR("Alan Cox");
 301 MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
 302 MODULE_LICENSE("GPL");
 303 MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
 304 MODULE_VERSION(DRV_VERSION);