drivers/ata/pata_cmd640.c

   1 /*
   2  * pata_cmd640.c        - CMD640 PCI PATA for new ATA layer
   3  *                        (C) 2007 Red Hat Inc
   4  *                        Alan Cox <alan@redhat.com>
   5  *
   6  * Based upon
   7  *  linux/drivers/ide/pci/cmd640.c              Version 1.02  Sep 01, 1996
   8  *
   9  *  Copyright (C) 1995-1996  Linus Torvalds & authors (see driver)
  10  *
  11  *      This drives only the PCI version of the controller. If you have a
  12  *      VLB one then we have enough docs to support it but you can write
  13  *      your own code.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/pci.h>
  19 #include <linux/init.h>
  20 #include <linux/blkdev.h>
  21 #include <linux/delay.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         int ret = ata_sff_port_start(ap);
 157         if (ret < 0)
 158                 return ret;
 159
 160         timing = devm_kzalloc(&pdev->dev, sizeof(struct cmd640_reg), GFP_KERNEL);
 161         if (timing == NULL)
 162                 return -ENOMEM;
 163         timing->last = -1;      /* Force a load */
 164         ap->private_data = timing;
 165         return ret;
 166 }
 167
 168 static struct scsi_host_template cmd640_sht = {
 169         ATA_BMDMA_SHT(DRV_NAME),
 170 };
 171
 172 static struct ata_port_operations cmd640_port_ops = {
 173         .inherits       = &ata_bmdma_port_ops,
 174         /* In theory xfer_noirq is not needed once we kill the prefetcher */
 175         .sff_data_xfer  = ata_sff_data_xfer_noirq,
 176         .qc_issue       = cmd640_qc_issue,
 177         .cable_detect   = ata_cable_40wire,
 178         .set_piomode    = cmd640_set_piomode,
 179         .port_start     = cmd640_port_start,
 180 };
 181
 182 static void cmd640_hardware_init(struct pci_dev *pdev)
 183 {
 184         u8 r;
 185         u8 ctrl;
 186
 187         /* CMD640 detected, commiserations */
 188         pci_write_config_byte(pdev, 0x5B, 0x00);
 189         /* Get version info */
 190         pci_read_config_byte(pdev, CFR, &r);
 191         /* PIO0 command cycles */
 192         pci_write_config_byte(pdev, CMDTIM, 0);
 193         /* 512 byte bursts (sector) */
 194         pci_write_config_byte(pdev, BRST, 0x40);
 195         /*
 196          * A reporter a long time ago
 197          * Had problems with the data fifo
 198          * So don't run the risk
 199          * Of putting crap on the disk
 200          * For its better just to go slow
 201          */
 202         /* Do channel 0 */
 203         pci_read_config_byte(pdev, CNTRL, &ctrl);
 204         pci_write_config_byte(pdev, CNTRL, ctrl | 0xC0);
 205         /* Ditto for channel 1 */
 206         pci_read_config_byte(pdev, ARTIM23, &ctrl);
 207         ctrl |= 0x0C;
 208         pci_write_config_byte(pdev, ARTIM23, ctrl);
 209 }
 210
 211 static int cmd640_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
 212 {
 213         static const struct ata_port_info info = {
 214                 .flags = ATA_FLAG_SLAVE_POSS,
 215                 .pio_mask = 0x1f,
 216                 .port_ops = &cmd640_port_ops
 217         };
 218         const struct ata_port_info *ppi[] = { &info, NULL };
 219         int rc;
 220
 221         rc = pcim_enable_device(pdev);
 222         if (rc)
 223                 return rc;
 224
 225         cmd640_hardware_init(pdev);
 226
 227         return ata_pci_sff_init_one(pdev, ppi, &cmd640_sht, NULL);
 228 }
 229
 230 #ifdef CONFIG_PM
 231 static int cmd640_reinit_one(struct pci_dev *pdev)
 232 {
 233         struct ata_host *host = dev_get_drvdata(&pdev->dev);
 234         int rc;
 235
 236         rc = ata_pci_device_do_resume(pdev);
 237         if (rc)
 238                 return rc;
 239         cmd640_hardware_init(pdev);
 240         ata_host_resume(host);
 241         return 0;
 242 }
 243 #endif
 244
 245 static const struct pci_device_id cmd640[] = {
 246         { PCI_VDEVICE(CMD, 0x640), 0 },
 247         { },
 248 };
 249
 250 static struct pci_driver cmd640_pci_driver = {
 251         .name           = DRV_NAME,
 252         .id_table       = cmd640,
 253         .probe          = cmd640_init_one,
 254         .remove         = ata_pci_remove_one,
 255 #ifdef CONFIG_PM
 256         .suspend        = ata_pci_device_suspend,
 257         .resume         = cmd640_reinit_one,
 258 #endif
 259 };
 260
 261 static int __init cmd640_init(void)
 262 {
 263         return pci_register_driver(&cmd640_pci_driver);
 264 }
 265
 266 static void __exit cmd640_exit(void)
 267 {
 268         pci_unregister_driver(&cmd640_pci_driver);
 269 }
 270
 271 MODULE_AUTHOR("Alan Cox");
 272 MODULE_DESCRIPTION("low-level driver for CMD640 PATA controllers");
 273 MODULE_LICENSE("GPL");
 274 MODULE_DEVICE_TABLE(pci, cmd640);
 275 MODULE_VERSION(DRV_VERSION);
 276
 277 module_init(cmd640_init);
 278 module_exit(cmd640_exit);