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Linux/drivers/ata/pata_rz1000.c

  1 /*
  2  *  RZ1000/1001 driver based upon
  3  *
  4  *  linux/drivers/ide/pci/rz1000.c      Version 0.06    January 12, 2003
  5  *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
  6  *  Principal Author:  mlord@pobox.com (Mark Lord)
  7  *
  8  *  See linux/MAINTAINERS for address of current maintainer.
  9  *
 10  *  This file provides support for disabling the buggy read-ahead
 11  *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
 12  */
 13 
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/pci.h>
 17 #include <linux/blkdev.h>
 18 #include <linux/delay.h>
 19 #include <scsi/scsi_host.h>
 20 #include <linux/libata.h>
 21 
 22 #define DRV_NAME        "pata_rz1000"
 23 #define DRV_VERSION     "0.2.4"
 24 
 25 
 26 /**
 27  *      rz1000_set_mode         -       mode setting function
 28  *      @link: ATA link
 29  *      @unused: returned device on set_mode failure
 30  *
 31  *      Use a non standard set_mode function. We don't want to be tuned. We
 32  *      would prefer to be BIOS generic but for the fact our hardware is
 33  *      whacked out.
 34  */
 35 
 36 static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused)
 37 {
 38         struct ata_device *dev;
 39 
 40         ata_for_each_dev(dev, link, ENABLED) {
 41                 /* We don't really care */
 42                 dev->pio_mode = XFER_PIO_0;
 43                 dev->xfer_mode = XFER_PIO_0;
 44                 dev->xfer_shift = ATA_SHIFT_PIO;
 45                 dev->flags |= ATA_DFLAG_PIO;
 46                 ata_dev_info(dev, "configured for PIO\n");
 47         }
 48         return 0;
 49 }
 50 
 51 
 52 static struct scsi_host_template rz1000_sht = {
 53         ATA_PIO_SHT(DRV_NAME),
 54 };
 55 
 56 static struct ata_port_operations rz1000_port_ops = {
 57         .inherits       = &ata_sff_port_ops,
 58         .cable_detect   = ata_cable_40wire,
 59         .set_mode       = rz1000_set_mode,
 60 };
 61 
 62 static int rz1000_fifo_disable(struct pci_dev *pdev)
 63 {
 64         u16 reg;
 65         /* Be exceptionally paranoid as we must be sure to apply the fix */
 66         if (pci_read_config_word(pdev, 0x40, &reg) != 0)
 67                 return -1;
 68         reg &= 0xDFFF;
 69         if (pci_write_config_word(pdev, 0x40, reg) != 0)
 70                 return -1;
 71         printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
 72         return 0;
 73 }
 74 
 75 /**
 76  *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
 77  *      @pdev: PCI device to register
 78  *      @ent: Entry in rz1000_pci_tbl matching with @pdev
 79  *
 80  *      Configure an RZ1000 interface. This doesn't require much special
 81  *      handling except that we *MUST* kill the chipset readahead or the
 82  *      user may experience data corruption.
 83  */
 84 
 85 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
 86 {
 87         static const struct ata_port_info info = {
 88                 .flags = ATA_FLAG_SLAVE_POSS,
 89                 .pio_mask = ATA_PIO4,
 90                 .port_ops = &rz1000_port_ops
 91         };
 92         const struct ata_port_info *ppi[] = { &info, NULL };
 93 
 94         ata_print_version_once(&pdev->dev, DRV_VERSION);
 95 
 96         if (rz1000_fifo_disable(pdev) == 0)
 97                 return ata_pci_sff_init_one(pdev, ppi, &rz1000_sht, NULL, 0);
 98 
 99         printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
100         /* Not safe to use so skip */
101         return -ENODEV;
102 }
103 
104 #ifdef CONFIG_PM
105 static int rz1000_reinit_one(struct pci_dev *pdev)
106 {
107         struct ata_host *host = pci_get_drvdata(pdev);
108         int rc;
109 
110         rc = ata_pci_device_do_resume(pdev);
111         if (rc)
112                 return rc;
113 
114         /* If this fails on resume (which is a "can't happen" case), we
115            must stop as any progress risks data loss */
116         if (rz1000_fifo_disable(pdev))
117                 panic("rz1000 fifo");
118 
119         ata_host_resume(host);
120         return 0;
121 }
122 #endif
123 
124 static const struct pci_device_id pata_rz1000[] = {
125         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
126         { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
127 
128         { },
129 };
130 
131 static struct pci_driver rz1000_pci_driver = {
132         .name           = DRV_NAME,
133         .id_table       = pata_rz1000,
134         .probe          = rz1000_init_one,
135         .remove         = ata_pci_remove_one,
136 #ifdef CONFIG_PM
137         .suspend        = ata_pci_device_suspend,
138         .resume         = rz1000_reinit_one,
139 #endif
140 };
141 
142 module_pci_driver(rz1000_pci_driver);
143 
144 MODULE_AUTHOR("Alan Cox");
145 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
146 MODULE_LICENSE("GPL");
147 MODULE_DEVICE_TABLE(pci, pata_rz1000);
148 MODULE_VERSION(DRV_VERSION);
149 

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