root/drivers/ata/pata_rdc.c

DEFINITIONS

1. rdc_pata_cable_detect
2. rdc_pata_prereset
3. rdc_set_piomode
4. rdc_set_dmamode
5. rdc_init_one
6. rdc_remove_one

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  pata_rdc            -       Driver for later RDC PATA controllers
   4  *
   5  *  This is actually a driver for hardware meeting
   6  *  INCITS 370-2004 (1510D): ATA Host Adapter Standards
   7  *
   8  *  Based on ata_piix.
   9  */
  10 
  11 #include <linux/kernel.h>
  12 #include <linux/module.h>
  13 #include <linux/pci.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <linux/gfp.h>
  18 #include <scsi/scsi_host.h>
  19 #include <linux/libata.h>
  20 #include <linux/dmi.h>
  21 
  22 #define DRV_NAME        "pata_rdc"
  23 #define DRV_VERSION     "0.01"
  24 
  25 struct rdc_host_priv {
  26         u32 saved_iocfg;
  27 };
  28 
  29 /**
  30  *      rdc_pata_cable_detect - Probe host controller cable detect info
  31  *      @ap: Port for which cable detect info is desired
  32  *
  33  *      Read 80c cable indicator from ATA PCI device's PCI config
  34  *      register.  This register is normally set by firmware (BIOS).
  35  *
  36  *      LOCKING:
  37  *      None (inherited from caller).
  38  */
  39 
  40 static int rdc_pata_cable_detect(struct ata_port *ap)
  41 {
  42         struct rdc_host_priv *hpriv = ap->host->private_data;
  43         u8 mask;
  44 
  45         /* check BIOS cable detect results */
  46         mask = 0x30 << (2 * ap->port_no);
  47         if ((hpriv->saved_iocfg & mask) == 0)
  48                 return ATA_CBL_PATA40;
  49         return ATA_CBL_PATA80;
  50 }
  51 
  52 /**
  53  *      rdc_pata_prereset - prereset for PATA host controller
  54  *      @link: Target link
  55  *      @deadline: deadline jiffies for the operation
  56  *
  57  *      LOCKING:
  58  *      None (inherited from caller).
  59  */
  60 static int rdc_pata_prereset(struct ata_link *link, unsigned long deadline)
  61 {
  62         struct ata_port *ap = link->ap;
  63         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  64 
  65         static const struct pci_bits rdc_enable_bits[] = {
  66                 { 0x41U, 1U, 0x80UL, 0x80UL },  /* port 0 */
  67                 { 0x43U, 1U, 0x80UL, 0x80UL },  /* port 1 */
  68         };
  69 
  70         if (!pci_test_config_bits(pdev, &rdc_enable_bits[ap->port_no]))
  71                 return -ENOENT;
  72         return ata_sff_prereset(link, deadline);
  73 }
  74 
  75 static DEFINE_SPINLOCK(rdc_lock);
  76 
  77 /**
  78  *      rdc_set_piomode - Initialize host controller PATA PIO timings
  79  *      @ap: Port whose timings we are configuring
  80  *      @adev: um
  81  *
  82  *      Set PIO mode for device, in host controller PCI config space.
  83  *
  84  *      LOCKING:
  85  *      None (inherited from caller).
  86  */
  87 
  88 static void rdc_set_piomode(struct ata_port *ap, struct ata_device *adev)
  89 {
  90         unsigned int pio        = adev->pio_mode - XFER_PIO_0;
  91         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
  92         unsigned long flags;
  93         unsigned int is_slave   = (adev->devno != 0);
  94         unsigned int master_port= ap->port_no ? 0x42 : 0x40;
  95         unsigned int slave_port = 0x44;
  96         u16 master_data;
  97         u8 slave_data;
  98         u8 udma_enable;
  99         int control = 0;
 100 
 101         static const     /* ISP  RTC */
 102         u8 timings[][2] = { { 0, 0 },
 103                             { 0, 0 },
 104                             { 1, 0 },
 105                             { 2, 1 },
 106                             { 2, 3 }, };
 107 
 108         if (pio >= 2)
 109                 control |= 1;   /* TIME1 enable */
 110         if (ata_pio_need_iordy(adev))
 111                 control |= 2;   /* IE enable */
 112 
 113         if (adev->class == ATA_DEV_ATA)
 114                 control |= 4;   /* PPE enable */
 115 
 116         spin_lock_irqsave(&rdc_lock, flags);
 117 
 118         /* PIO configuration clears DTE unconditionally.  It will be
 119          * programmed in set_dmamode which is guaranteed to be called
 120          * after set_piomode if any DMA mode is available.
 121          */
 122         pci_read_config_word(dev, master_port, &master_data);
 123         if (is_slave) {
 124                 /* clear TIME1|IE1|PPE1|DTE1 */
 125                 master_data &= 0xff0f;
 126                 /* Enable SITRE (separate slave timing register) */
 127                 master_data |= 0x4000;
 128                 /* enable PPE1, IE1 and TIME1 as needed */
 129                 master_data |= (control << 4);
 130                 pci_read_config_byte(dev, slave_port, &slave_data);
 131                 slave_data &= (ap->port_no ? 0x0f : 0xf0);
 132                 /* Load the timing nibble for this slave */
 133                 slave_data |= ((timings[pio][0] << 2) | timings[pio][1])
 134                                                 << (ap->port_no ? 4 : 0);
 135         } else {
 136                 /* clear ISP|RCT|TIME0|IE0|PPE0|DTE0 */
 137                 master_data &= 0xccf0;
 138                 /* Enable PPE, IE and TIME as appropriate */
 139                 master_data |= control;
 140                 /* load ISP and RCT */
 141                 master_data |=
 142                         (timings[pio][0] << 12) |
 143                         (timings[pio][1] << 8);
 144         }
 145         pci_write_config_word(dev, master_port, master_data);
 146         if (is_slave)
 147                 pci_write_config_byte(dev, slave_port, slave_data);
 148 
 149         /* Ensure the UDMA bit is off - it will be turned back on if
 150            UDMA is selected */
 151 
 152         pci_read_config_byte(dev, 0x48, &udma_enable);
 153         udma_enable &= ~(1 << (2 * ap->port_no + adev->devno));
 154         pci_write_config_byte(dev, 0x48, udma_enable);
 155 
 156         spin_unlock_irqrestore(&rdc_lock, flags);
 157 }
 158 
 159 /**
 160  *      rdc_set_dmamode - Initialize host controller PATA PIO timings
 161  *      @ap: Port whose timings we are configuring
 162  *      @adev: Drive in question
 163  *
 164  *      Set UDMA mode for device, in host controller PCI config space.
 165  *
 166  *      LOCKING:
 167  *      None (inherited from caller).
 168  */
 169 
 170 static void rdc_set_dmamode(struct ata_port *ap, struct ata_device *adev)
 171 {
 172         struct pci_dev *dev     = to_pci_dev(ap->host->dev);
 173         unsigned long flags;
 174         u8 master_port          = ap->port_no ? 0x42 : 0x40;
 175         u16 master_data;
 176         u8 speed                = adev->dma_mode;
 177         int devid               = adev->devno + 2 * ap->port_no;
 178         u8 udma_enable          = 0;
 179 
 180         static const     /* ISP  RTC */
 181         u8 timings[][2] = { { 0, 0 },
 182                             { 0, 0 },
 183                             { 1, 0 },
 184                             { 2, 1 },
 185                             { 2, 3 }, };
 186 
 187         spin_lock_irqsave(&rdc_lock, flags);
 188 
 189         pci_read_config_word(dev, master_port, &master_data);
 190         pci_read_config_byte(dev, 0x48, &udma_enable);
 191 
 192         if (speed >= XFER_UDMA_0) {
 193                 unsigned int udma = adev->dma_mode - XFER_UDMA_0;
 194                 u16 udma_timing;
 195                 u16 ideconf;
 196                 int u_clock, u_speed;
 197 
 198                 /*
 199                  * UDMA is handled by a combination of clock switching and
 200                  * selection of dividers
 201                  *
 202                  * Handy rule: Odd modes are UDMATIMx 01, even are 02
 203                  *             except UDMA0 which is 00
 204                  */
 205                 u_speed = min(2 - (udma & 1), udma);
 206                 if (udma == 5)
 207                         u_clock = 0x1000;       /* 100Mhz */
 208                 else if (udma > 2)
 209                         u_clock = 1;            /* 66Mhz */
 210                 else
 211                         u_clock = 0;            /* 33Mhz */
 212 
 213                 udma_enable |= (1 << devid);
 214 
 215                 /* Load the CT/RP selection */
 216                 pci_read_config_word(dev, 0x4A, &udma_timing);
 217                 udma_timing &= ~(3 << (4 * devid));
 218                 udma_timing |= u_speed << (4 * devid);
 219                 pci_write_config_word(dev, 0x4A, udma_timing);
 220 
 221                 /* Select a 33/66/100Mhz clock */
 222                 pci_read_config_word(dev, 0x54, &ideconf);
 223                 ideconf &= ~(0x1001 << devid);
 224                 ideconf |= u_clock << devid;
 225                 pci_write_config_word(dev, 0x54, ideconf);
 226         } else {
 227                 /*
 228                  * MWDMA is driven by the PIO timings. We must also enable
 229                  * IORDY unconditionally along with TIME1. PPE has already
 230                  * been set when the PIO timing was set.
 231                  */
 232                 unsigned int mwdma      = adev->dma_mode - XFER_MW_DMA_0;
 233                 unsigned int control;
 234                 u8 slave_data;
 235                 const unsigned int needed_pio[3] = {
 236                         XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
 237                 };
 238                 int pio = needed_pio[mwdma] - XFER_PIO_0;
 239 
 240                 control = 3;    /* IORDY|TIME1 */
 241 
 242                 /* If the drive MWDMA is faster than it can do PIO then
 243                    we must force PIO into PIO0 */
 244 
 245                 if (adev->pio_mode < needed_pio[mwdma])
 246                         /* Enable DMA timing only */
 247                         control |= 8;   /* PIO cycles in PIO0 */
 248 
 249                 if (adev->devno) {      /* Slave */
 250                         master_data &= 0xFF4F;  /* Mask out IORDY|TIME1|DMAONLY */
 251                         master_data |= control << 4;
 252                         pci_read_config_byte(dev, 0x44, &slave_data);
 253                         slave_data &= (ap->port_no ? 0x0f : 0xf0);
 254                         /* Load the matching timing */
 255                         slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
 256                         pci_write_config_byte(dev, 0x44, slave_data);
 257                 } else {        /* Master */
 258                         master_data &= 0xCCF4;  /* Mask out IORDY|TIME1|DMAONLY
 259                                                    and master timing bits */
 260                         master_data |= control;
 261                         master_data |=
 262                                 (timings[pio][0] << 12) |
 263                                 (timings[pio][1] << 8);
 264                 }
 265 
 266                 udma_enable &= ~(1 << devid);
 267                 pci_write_config_word(dev, master_port, master_data);
 268         }
 269         pci_write_config_byte(dev, 0x48, udma_enable);
 270 
 271         spin_unlock_irqrestore(&rdc_lock, flags);
 272 }
 273 
 274 static struct ata_port_operations rdc_pata_ops = {
 275         .inherits               = &ata_bmdma32_port_ops,
 276         .cable_detect           = rdc_pata_cable_detect,
 277         .set_piomode            = rdc_set_piomode,
 278         .set_dmamode            = rdc_set_dmamode,
 279         .prereset               = rdc_pata_prereset,
 280 };
 281 
 282 static const struct ata_port_info rdc_port_info = {
 283 
 284         .flags          = ATA_FLAG_SLAVE_POSS,
 285         .pio_mask       = ATA_PIO4,
 286         .mwdma_mask     = ATA_MWDMA12_ONLY,
 287         .udma_mask      = ATA_UDMA5,
 288         .port_ops       = &rdc_pata_ops,
 289 };
 290 
 291 static struct scsi_host_template rdc_sht = {
 292         ATA_BMDMA_SHT(DRV_NAME),
 293 };
 294 
 295 /**
 296  *      rdc_init_one - Register PIIX ATA PCI device with kernel services
 297  *      @pdev: PCI device to register
 298  *      @ent: Entry in rdc_pci_tbl matching with @pdev
 299  *
 300  *      Called from kernel PCI layer.  We probe for combined mode (sigh),
 301  *      and then hand over control to libata, for it to do the rest.
 302  *
 303  *      LOCKING:
 304  *      Inherited from PCI layer (may sleep).
 305  *
 306  *      RETURNS:
 307  *      Zero on success, or -ERRNO value.
 308  */
 309 
 310 static int rdc_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
 311 {
 312         struct device *dev = &pdev->dev;
 313         struct ata_port_info port_info[2];
 314         const struct ata_port_info *ppi[] = { &port_info[0], &port_info[1] };
 315         struct ata_host *host;
 316         struct rdc_host_priv *hpriv;
 317         int rc;
 318 
 319         ata_print_version_once(&pdev->dev, DRV_VERSION);
 320 
 321         port_info[0] = rdc_port_info;
 322         port_info[1] = rdc_port_info;
 323 
 324         /* enable device and prepare host */
 325         rc = pcim_enable_device(pdev);
 326         if (rc)
 327                 return rc;
 328 
 329         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
 330         if (!hpriv)
 331                 return -ENOMEM;
 332 
 333         /* Save IOCFG, this will be used for cable detection, quirk
 334          * detection and restoration on detach.
 335          */
 336         pci_read_config_dword(pdev, 0x54, &hpriv->saved_iocfg);
 337 
 338         rc = ata_pci_bmdma_prepare_host(pdev, ppi, &host);
 339         if (rc)
 340                 return rc;
 341         host->private_data = hpriv;
 342 
 343         pci_intx(pdev, 1);
 344 
 345         host->flags |= ATA_HOST_PARALLEL_SCAN;
 346 
 347         pci_set_master(pdev);
 348         return ata_pci_sff_activate_host(host, ata_bmdma_interrupt, &rdc_sht);
 349 }
 350 
 351 static void rdc_remove_one(struct pci_dev *pdev)
 352 {
 353         struct ata_host *host = pci_get_drvdata(pdev);
 354         struct rdc_host_priv *hpriv = host->private_data;
 355 
 356         pci_write_config_dword(pdev, 0x54, hpriv->saved_iocfg);
 357 
 358         ata_pci_remove_one(pdev);
 359 }
 360 
 361 static const struct pci_device_id rdc_pci_tbl[] = {
 362         { PCI_DEVICE(0x17F3, 0x1011), },
 363         { PCI_DEVICE(0x17F3, 0x1012), },
 364         { }     /* terminate list */
 365 };
 366 
 367 static struct pci_driver rdc_pci_driver = {
 368         .name                   = DRV_NAME,
 369         .id_table               = rdc_pci_tbl,
 370         .probe                  = rdc_init_one,
 371         .remove                 = rdc_remove_one,
 372 #ifdef CONFIG_PM_SLEEP
 373         .suspend                = ata_pci_device_suspend,
 374         .resume                 = ata_pci_device_resume,
 375 #endif
 376 };
 377 
 378 
 379 module_pci_driver(rdc_pci_driver);
 380 
 381 MODULE_AUTHOR("Alan Cox (based on ata_piix)");
 382 MODULE_DESCRIPTION("SCSI low-level driver for RDC PATA controllers");
 383 MODULE_LICENSE("GPL");
 384 MODULE_DEVICE_TABLE(pci, rdc_pci_tbl);
 385 MODULE_VERSION(DRV_VERSION);