drivers/ata/pata_cmd640.c

   1 /*
   2  * pata_cmd640.c        - CMD640 PCI PATA for new ATA layer
   3  *                        (C) 2007 Red Hat Inc
   4  *
   5  * Based upon
   6  *  linux/drivers/ide/pci/cmd640.c              Version 1.02  Sep 01, 1996
   7  *
   8  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see driver)
   9  *
  10  *      This drives only the PCI version of the controller. If you have a
  11  *      VLB one then we have enough docs to support it but you can write
  12  *      your own code.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/pci.h>
  18 #include <linux/init.h>
  19 #include <linux/blkdev.h>
  20 #include <linux/delay.h>
  21 #include <linux/gfp.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/libata.h>
  24
  25 #define DRV_NAME "pata_cmd640"
  26 #define DRV_VERSION "0.0.5"
  27
  28 struct cmd640_reg {
  29         int last;
  30         u8 reg58[ATA_MAX_DEVICES];
  31 };
  32
  33 enum {
  34         CFR = 0x50,
  35         CNTRL = 0x51,
  36         CMDTIM = 0x52,
  37         ARTIM0 = 0x53,
  38         DRWTIM0 = 0x54,
  39         ARTIM23 = 0x57,
  40         DRWTIM23 = 0x58,
  41         BRST = 0x59
  42 };
  43
  44 /**
  45  *      cmd640_set_piomode      -       set initial PIO mode data
  46  *      @ap: ATA port
  47  *      @adev: ATA device
  48  *
  49  *      Called to do the PIO mode setup.
  50  */
  51
  52 static void cmd640_set_piomode(struct ata_port *ap, struct ata_device *adev)
  53 {
  54         struct cmd640_reg *timing = ap->private_data;
  55         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  56         struct ata_timing t;
  57         const unsigned long T = 1000000 / 33;
  58         const u8 setup_data[] = { 0x40, 0x40, 0x40, 0x80, 0x00 };
  59         u8 reg;
  60         int arttim = ARTIM0 + 2 * adev->devno;
  61         struct ata_device *pair = ata_dev_pair(adev);
  62
  63         if (ata_timing_compute(adev, adev->pio_mode, &t, T, 0) < 0) {
  64                 printk(KERN_ERR DRV_NAME ": mode computation failed.\n");
  65                 return;
  66         }
  67
  68         /* The second channel has shared timings and the setup timing is
  69            messy to switch to merge it for worst case */
  70         if (ap->port_no && pair) {
  71                 struct ata_timing p;
  72                 ata_timing_compute(pair, pair->pio_mode, &p, T, 1);
  73                 ata_timing_merge(&p, &t, &t, ATA_TIMING_SETUP);
  74         }
  75
  76         /* Make the timings fit */
  77         if (t.recover > 16) {
  78                 t.active += t.recover - 16;
  79                 t.recover = 16;
  80         }
  81         if (t.active > 16)
  82                 t.active = 16;
  83
  84         /* Now convert the clocks into values we can actually stuff into
  85            the chip */
  86
  87         if (t.recover > 1)
  88                 t.recover--;    /* 640B only */
  89         else
  90                 t.recover = 15;
  91
  92         if (t.setup > 4)
  93                 t.setup = 0xC0;
  94         else
  95                 t.setup = setup_data[t.setup];
  96
  97         if (ap->port_no == 0) {
  98                 t.active &= 0x0F;       /* 0 = 16 */
  99
 100                 /* Load setup timing */
 101                 pci_read_config_byte(pdev, arttim, &reg);
 102                 reg &= 0x3F;
 103                 reg |= t.setup;
 104                 pci_write_config_byte(pdev, arttim, reg);
 105
 106                 /* Load active/recovery */
 107                 pci_write_config_byte(pdev, arttim + 1, (t.active << 4) | t.recover);
 108         } else {
 109                 /* Save the shared timings for channel, they will be loaded
 110                    by qc_issue. Reloading the setup time is expensive so we
 111                    keep a merged one loaded */
 112                 pci_read_config_byte(pdev, ARTIM23, &reg);
 113                 reg &= 0x3F;
 114                 reg |= t.setup;
 115                 pci_write_config_byte(pdev, ARTIM23, reg);
 116                 timing->reg58[adev->devno] = (t.active << 4) | t.recover;
 117         }
 118 }
 119
 120
 121 /**
 122  *      cmd640_qc_issue -       command preparation hook
 123  *      @qc: Command to be issued
 124  *
 125  *      Channel 1 has shared timings. We must reprogram the
 126  *      clock each drive 2/3 switch we do.
 127  */
 128
 129 static unsigned int cmd640_qc_issue(struct ata_queued_cmd *qc)
 130 {
 131         struct ata_port *ap = qc->ap;
 132         struct ata_device *adev = qc->dev;
 133         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 134         struct cmd640_reg *timing = ap->private_data;
 135
 136         if (ap->port_no != 0 && adev->devno != timing->last) {
 137                 pci_write_config_byte(pdev, DRWTIM23, timing->reg58[adev->devno]);
 138                 timing->last = adev->devno;
 139         }
 140         return ata_sff_qc_issue(qc);
 141 }
 142
 143 /**
 144  *      cmd640_port_start       -       port setup
 145  *      @ap: ATA port being set up
 146  *
 147  *      The CMD640 needs to maintain private data structures so we
 148  *      allocate space here.
 149  */
 150
 151 static int cmd640_port_start(struct ata_port *ap)
 152 {
 153         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
 154         struct cmd640_reg *timing;
 155
 156         timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
 157         if (timing == NULL)
 158                 return -ENOMEM;
 159         timing->last = -1;      /* Force a load */
 160         ap->private_data = timing;
 161         return 0;
 162 }
 163
 164 static struct scsi_host_template cmd640_sht = {
 165         ATA_PIO_SHT(DRV_NAME),
 166 };
 167
 168 static struct ata_port_operations cmd640_port_ops = {
 169         .inherits       = &ata_sff_port_ops,
 170         /* In theory xfer_noirq is not needed once we kill the prefetcher */
 171         .sff_data_xfer  = ata_sff_data_xfer_noirq,
 172         .qc_issue       = cmd640_qc_issue,
 173         .cable_detect   = ata_cable_40wire,
 174         .set_piomode    = cmd640_set_piomode,
 175         .port_start     = cmd640_port_start,
 176 };
 177
 178 static void cmd640_hardware_init(struct pci_dev *pdev)
 179 {
 180         u8 ctrl;
 181
 182         /* CMD640 detected, commiserations */
 183         pci_write_config_byte(pdev, 0x5B, 0x00);
 184         /* PIO0 command cycles */
 185         pci_write_config_byte(pdev, CMDTIM, 0);
 186         /* 512 byte bursts (sector) */
 187         pci_write_config_byte(pdev, BRST, 0x40);
 188         /*
 189          * A reporter a long time ago
 190          * Had problems with the data fifo
 191          * So don't run the risk
 192          * Of putting crap on the disk
 193          * For its better just to go slow
 194          */
 195         /* Do channel 0 */
 196         pci_read_config_byte(pdev, CNTRL, &ctrl);
 197         pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
 198         /* Ditto for channel 1 */
 199         pci_read_config_byte(pdev, ARTIM23, &ctrl);
 200         ctrl |= 0x0C;
 201         pci_write_config_byte(pdev, ARTIM23, ctrl);
 202 }
 203
 204 static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 205 {
 206         static const struct ata_port_info info = {
 207                 .flags = ATA_FLAG_SLAVE_POSS,
 208                 .pio_mask = ATA_PIO4,
 209                 .port_ops = &cmd640_port_ops
 210         };
 211         const struct ata_port_info *ppi[] = { &info, NULL };
 212         int rc;
 213
 214         rc = pcim_enable_device(pdev);
 215         if (rc)
 216                 return rc;
 217
 218         cmd640_hardware_init(pdev);
 219
 220         return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL, 0);
 221 }
 222
 223 #ifdef CONFIG_PM
 224 static int cmd640_reinit_one(struct pci_dev *pdev)
 225 {
 226         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 227         int rc;
 228
 229         rc = ata_pci_device_do_resume(pdev);
 230         if (rc)
 231                 return rc;
 232         cmd640_hardware_init(pdev);
 233         ata_host_resume(host);
 234         return 0;
 235 }
 236 #endif
 237
 238 static const struct pci_device_id cmd640[] = {
 239         { PCI_VDEVICE(CMD, 0x640), 0 },
 240         { },
 241 };
 242
 243 static struct pci_driver cmd640_pci_driver = {
 244         .name           = DRV_NAME,
 245         .id_table       = cmd640,
 246         .probe          = cmd640_init_one,
 247         .remove         = ata_pci_remove_one,
 248 #ifdef CONFIG_PM
 249         .suspend        = ata_pci_device_suspend,
 250         .resume         = cmd640_reinit_one,
 251 #endif
 252 };
 253
 254 static int __init cmd640_init(void)
 255 {
 256         return pci_register_driver(&cmd640_pci_driver);
 257 }
 258
 259 static void __exit cmd640_exit(void)
 260 {
 261         pci_unregister_driver(&cmd640_pci_driver);
 262 }
 263
 264 MODULE_AUTHOR("Alan Cox");
 265 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
 266 MODULE_LICENSE("GPL");
 267 MODULE_DEVICE_TABLE(pci, cmd640);
 268 MODULE_VERSION(DRV_VERSION);
 269
 270 module_init(cmd640_init);
 271 module_exit(cmd640_exit);