drivers/ata/pata_jmicron.c

   1 /*
   2  *    pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
   3  *                      PATA port of the controller. The SATA ports are
   4  *                      driven by AHCI in the usual configuration although
   5  *                      this driver can handle other setups if we need it.
   6  *
   7  *      (c) 2006 Red Hat  <alan@redhat.com>
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/module.h>
  12 #include <linux/pci.h>
  13 #include <linux/init.h>
  14 #include <linux/blkdev.h>
  15 #include <linux/delay.h>
  16 #include <linux/device.h>
  17 #include <scsi/scsi_host.h>
  18 #include <linux/libata.h>
  19 #include <linux/ata.h>
  20
  21 #define DRV_NAME        "pata_jmicron"
  22 #define DRV_VERSION     "0.1.2"
  23
  24 typedef enum {
  25         PORT_PATA0 = 0,
  26         PORT_PATA1 = 1,
  27         PORT_SATA = 2,
  28 } port_type;
  29
  30 /**
  31  *      jmicron_pre_reset       -       check for 40/80 pin
  32  *      @ap: Port
  33  *
  34  *      Perform the PATA port setup we need.
  35
  36  *      On the Jmicron 361/363 there is a single PATA port that can be mapped
  37  *      either as primary or secondary (or neither). We don't do any policy
  38  *      and setup here. We assume that has been done by init_one and the
  39  *      BIOS.
  40  */
  41
  42 static int jmicron_pre_reset(struct ata_port *ap)
  43 {
  44         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  45         u32 control;
  46         u32 control5;
  47         int port_mask = 1<< (4 * ap->port_no);
  48         int port = ap->port_no;
  49         port_type port_map[2];
  50
  51         /* Check if our port is enabled */
  52         pci_read_config_dword(pdev, 0x40, &control);
  53         if ((control & port_mask) == 0)
  54                 return -ENOENT;
  55
  56         /* There are two basic mappings. One has the two SATA ports merged
  57            as master/slave and the secondary as PATA, the other has only the
  58            SATA port mapped */
  59         if (control & (1 << 23)) {
  60                 port_map[0] = PORT_SATA;
  61                 port_map[1] = PORT_PATA0;
  62         } else {
  63                 port_map[0] = PORT_SATA;
  64                 port_map[1] = PORT_SATA;
  65         }
  66
  67         /* The 365/366 may have this bit set to map the second PATA port
  68            as the internal primary channel */
  69         pci_read_config_dword(pdev, 0x80, &control5);
  70         if (control5 & (1<<24))
  71                 port_map[0] = PORT_PATA1;
  72
  73         /* The two ports may then be logically swapped by the firmware */
  74         if (control & (1 << 22))
  75                 port = port ^ 1;
  76
  77         /*
  78          *      Now we know which physical port we are talking about we can
  79          *      actually do our cable checking etc. Thankfully we don't need
  80          *      to do the plumbing for other cases.
  81          */
  82         switch (port_map[port])
  83         {
  84         case PORT_PATA0:
  85                 if (control & (1 << 5))
  86                         return 0;
  87                 if (control & (1 << 3)) /* 40/80 pin primary */
  88                         ap->cbl = ATA_CBL_PATA40;
  89                 else
  90                         ap->cbl = ATA_CBL_PATA80;
  91                 break;
  92         case PORT_PATA1:
  93                 /* Bit 21 is set if the port is enabled */
  94                 if ((control5 & (1 << 21)) == 0)
  95                         return 0;
  96                 if (control5 & (1 << 19))       /* 40/80 pin secondary */
  97                         ap->cbl = ATA_CBL_PATA40;
  98                 else
  99                         ap->cbl = ATA_CBL_PATA80;
 100                 break;
 101         case PORT_SATA:
 102                 ap->cbl = ATA_CBL_SATA;
 103                 break;
 104         }
 105         return ata_std_prereset(ap);
 106 }
 107
 108 /**
 109  *      jmicron_error_handler - Setup and error handler
 110  *      @ap: Port to handle
 111  *
 112  *      LOCKING:
 113  *      None (inherited from caller).
 114  */
 115
 116 static void jmicron_error_handler(struct ata_port *ap)
 117 {
 118         return ata_bmdma_drive_eh(ap, jmicron_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
 119 }
 120
 121 /* No PIO or DMA methods needed for this device */
 122
 123 static struct scsi_host_template jmicron_sht = {
 124         .module                 = THIS_MODULE,
 125         .name                   = DRV_NAME,
 126         .ioctl                  = ata_scsi_ioctl,
 127         .queuecommand           = ata_scsi_queuecmd,
 128         .can_queue              = ATA_DEF_QUEUE,
 129         .this_id                = ATA_SHT_THIS_ID,
 130         .sg_tablesize           = LIBATA_MAX_PRD,
 131         /* Special handling needed if you have sector or LBA48 limits */
 132         .max_sectors            = ATA_MAX_SECTORS,
 133         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 134         .emulated               = ATA_SHT_EMULATED,
 135         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 136         .proc_name              = DRV_NAME,
 137         .dma_boundary           = ATA_DMA_BOUNDARY,
 138         .slave_configure        = ata_scsi_slave_config,
 139         /* Use standard CHS mapping rules */
 140         .bios_param             = ata_std_bios_param,
 141 };
 142
 143 static const struct ata_port_operations jmicron_ops = {
 144         .port_disable           = ata_port_disable,
 145
 146         /* Task file is PCI ATA format, use helpers */
 147         .tf_load                = ata_tf_load,
 148         .tf_read                = ata_tf_read,
 149         .check_status           = ata_check_status,
 150         .exec_command           = ata_exec_command,
 151         .dev_select             = ata_std_dev_select,
 152
 153         .freeze                 = ata_bmdma_freeze,
 154         .thaw                   = ata_bmdma_thaw,
 155         .error_handler          = jmicron_error_handler,
 156         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
 157
 158         /* BMDMA handling is PCI ATA format, use helpers */
 159         .bmdma_setup            = ata_bmdma_setup,
 160         .bmdma_start            = ata_bmdma_start,
 161         .bmdma_stop             = ata_bmdma_stop,
 162         .bmdma_status           = ata_bmdma_status,
 163         .qc_prep                = ata_qc_prep,
 164         .qc_issue               = ata_qc_issue_prot,
 165         .data_xfer              = ata_pio_data_xfer,
 166
 167         /* IRQ-related hooks */
 168         .irq_handler            = ata_interrupt,
 169         .irq_clear              = ata_bmdma_irq_clear,
 170
 171         /* Generic PATA PCI ATA helpers */
 172         .port_start             = ata_port_start,
 173         .port_stop              = ata_port_stop,
 174         .host_stop              = ata_host_stop,
 175 };
 176
 177
 178 /**
 179  *      jmicron_init_one - Register Jmicron ATA PCI device with kernel services
 180  *      @pdev: PCI device to register
 181  *      @ent: Entry in jmicron_pci_tbl matching with @pdev
 182  *
 183  *      Called from kernel PCI layer.
 184  *
 185  *      LOCKING:
 186  *      Inherited from PCI layer (may sleep).
 187  *
 188  *      RETURNS:
 189  *      Zero on success, or -ERRNO value.
 190  */
 191
 192 static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 193 {
 194         static struct ata_port_info info = {
 195                 .sht            = &jmicron_sht,
 196                 .flags  = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
 197
 198                 .pio_mask       = 0x1f,
 199                 .mwdma_mask     = 0x07,
 200                 .udma_mask      = 0x3f,
 201
 202                 .port_ops       = &jmicron_ops,
 203         };
 204         struct ata_port_info *port_info[2] = { &info, &info };
 205
 206         u32 reg;
 207
 208         if (id->driver_data != 368) {
 209                 /* Put the controller into AHCI mode in case the AHCI driver
 210                    has not yet been loaded. This can be done with either
 211                    function present */
 212
 213                 /* FIXME: We may want a way to override this in future */
 214                 pci_write_config_byte(pdev, 0x41, 0xa1);
 215         }
 216
 217         /* PATA controller is fn 1, AHCI is fn 0 */
 218         if (PCI_FUNC(pdev->devfn) != 1)
 219                 return -ENODEV;
 220
 221         if ( id->driver_data == 365 || id->driver_data == 366) {
 222                 /* The 365/66 have two PATA channels, redirect the second */
 223                 pci_read_config_dword(pdev, 0x80, &reg);
 224                 reg |= (1 << 24);       /* IDE1 to PATA IDE secondary */
 225                 pci_write_config_dword(pdev, 0x80, reg);
 226         }
 227
 228         return ata_pci_init_one(pdev, port_info, 2);
 229 }
 230
 231 static const struct pci_device_id jmicron_pci_tbl[] = {
 232         { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB361), 361},
 233         { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB363), 363},
 234         { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB365), 365},
 235         { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB366), 366},
 236         { PCI_VDEVICE(JMICRON, PCI_DEVICE_ID_JMICRON_JMB368), 368},
 237
 238         { }     /* terminate list */
 239 };
 240
 241 static struct pci_driver jmicron_pci_driver = {
 242         .name                   = DRV_NAME,
 243         .id_table               = jmicron_pci_tbl,
 244         .probe                  = jmicron_init_one,
 245         .remove                 = ata_pci_remove_one,
 246 };
 247
 248 static int __init jmicron_init(void)
 249 {
 250         return pci_register_driver(&jmicron_pci_driver);
 251 }
 252
 253 static void __exit jmicron_exit(void)
 254 {
 255         pci_unregister_driver(&jmicron_pci_driver);
 256 }
 257
 258 module_init(jmicron_init);
 259 module_exit(jmicron_exit);
 260
 261 MODULE_AUTHOR("Alan Cox");
 262 MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
 263 MODULE_LICENSE("GPL");
 264 MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
 265 MODULE_VERSION(DRV_VERSION);
 266