linux/drivers/ata/pata_efar.c
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   1/*
   2 *    pata_efar.c - EFAR PIIX clone controller driver
   3 *
   4 *      (C) 2005 Red Hat
   5 *      (C) 2009-2010 Bartlomiej Zolnierkiewicz
   6 *
   7 *    Some parts based on ata_piix.c by Jeff Garzik and others.
   8 *
   9 *    The EFAR is a PIIX4 clone with UDMA66 support. Unlike the later
  10 *    Intel ICH controllers the EFAR widened the UDMA mode register bits
  11 *    and doesn't require the funky clock selection.
  12 */
  13
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/pci.h>
  17#include <linux/init.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
  37static 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
  60static 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
  71static 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
  84static 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
 158static 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
 237static struct scsi_host_template efar_sht = {
 238        ATA_BMDMA_SHT(DRV_NAME),
 239};
 240
 241static 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
 264static 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
 281static const struct pci_device_id efar_pci_tbl[] = {
 282        { PCI_VDEVICE(EFAR, 0x9130), },
 283
 284        { }     /* terminate list */
 285};
 286
 287static 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
 293        .suspend                = ata_pci_device_suspend,
 294        .resume                 = ata_pci_device_resume,
 295#endif
 296};
 297
 298module_pci_driver(efar_pci_driver);
 299
 300MODULE_AUTHOR("Alan Cox");
 301MODULE_DESCRIPTION("SCSI low-level driver for EFAR PIIX clones");
 302MODULE_LICENSE("GPL");
 303MODULE_DEVICE_TABLE(pci, efar_pci_tbl);
 304MODULE_VERSION(DRV_VERSION);
 305
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