root/drivers/ata/pata_jmicron.c

DEFINITIONS

1. jmicron_pre_reset
2. jmicron_init_one

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *    pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
   4  *                      PATA port of the controller. The SATA ports are
   5  *                      driven by AHCI in the usual configuration although
   6  *                      this driver can handle other setups if we need it.
   7  *
   8  *      (c) 2006 Red Hat
   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 <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     "0.1.5"
  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  *      @link: ATA link
  33  *      @deadline: deadline jiffies for the operation
  34  *
  35  *      Perform the PATA port setup we need.
  36  *
  37  *      On the Jmicron 361/363 there is a single PATA port that can be mapped
  38  *      either as primary or secondary (or neither). We don't do any policy
  39  *      and setup here. We assume that has been done by init_one and the
  40  *      BIOS.
  41  */
  42 static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
  43 {
  44         struct ata_port *ap = link->ap;
  45         struct pci_dev *pdev = to_pci_dev(ap->host->dev);
  46         u32 control;
  47         u32 control5;
  48         int port_mask = 1<< (4 * ap->port_no);
  49         int port = ap->port_no;
  50         port_type port_map[2];
  51 
  52         /* Check if our port is enabled */
  53         pci_read_config_dword(pdev, 0x40, &control);
  54         if ((control & port_mask) == 0)
  55                 return -ENOENT;
  56 
  57         /* There are two basic mappings. One has the two SATA ports merged
  58            as master/slave and the secondary as PATA, the other has only the
  59            SATA port mapped */
  60         if (control & (1 << 23)) {
  61                 port_map[0] = PORT_SATA;
  62                 port_map[1] = PORT_PATA0;
  63         } else {
  64                 port_map[0] = PORT_SATA;
  65                 port_map[1] = PORT_SATA;
  66         }
  67 
  68         /* The 365/366 may have this bit set to map the second PATA port
  69            as the internal primary channel */
  70         pci_read_config_dword(pdev, 0x80, &control5);
  71         if (control5 & (1<<24))
  72                 port_map[0] = PORT_PATA1;
  73 
  74         /* The two ports may then be logically swapped by the firmware */
  75         if (control & (1 << 22))
  76                 port = port ^ 1;
  77 
  78         /*
  79          *      Now we know which physical port we are talking about we can
  80          *      actually do our cable checking etc. Thankfully we don't need
  81          *      to do the plumbing for other cases.
  82          */
  83         switch (port_map[port]) {
  84         case PORT_PATA0:
  85                 if ((control & (1 << 5)) == 0)
  86                         return -ENOENT;
  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 -ENOENT;
  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_sff_prereset(link, deadline);
 106 }
 107 
 108 /* No PIO or DMA methods needed for this device */
 109 
 110 static struct scsi_host_template jmicron_sht = {
 111         ATA_BMDMA_SHT(DRV_NAME),
 112 };
 113 
 114 static struct ata_port_operations jmicron_ops = {
 115         .inherits               = &ata_bmdma_port_ops,
 116         .prereset               = jmicron_pre_reset,
 117 };
 118 
 119 
 120 /**
 121  *      jmicron_init_one - Register Jmicron ATA PCI device with kernel services
 122  *      @pdev: PCI device to register
 123  *      @ent: Entry in jmicron_pci_tbl matching with @pdev
 124  *
 125  *      Called from kernel PCI layer.
 126  *
 127  *      LOCKING:
 128  *      Inherited from PCI layer (may sleep).
 129  *
 130  *      RETURNS:
 131  *      Zero on success, or -ERRNO value.
 132  */
 133 
 134 static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
 135 {
 136         static const struct ata_port_info info = {
 137                 .flags  = ATA_FLAG_SLAVE_POSS,
 138 
 139                 .pio_mask       = ATA_PIO4,
 140                 .mwdma_mask     = ATA_MWDMA2,
 141                 .udma_mask      = ATA_UDMA5,
 142 
 143                 .port_ops       = &jmicron_ops,
 144         };
 145         const struct ata_port_info *ppi[] = { &info, NULL };
 146 
 147         return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
 148 }
 149 
 150 static const struct pci_device_id jmicron_pci_tbl[] = {
 151         { PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
 152           PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
 153         { }     /* terminate list */
 154 };
 155 
 156 static struct pci_driver jmicron_pci_driver = {
 157         .name                   = DRV_NAME,
 158         .id_table               = jmicron_pci_tbl,
 159         .probe                  = jmicron_init_one,
 160         .remove                 = ata_pci_remove_one,
 161 #ifdef CONFIG_PM_SLEEP
 162         .suspend                = ata_pci_device_suspend,
 163         .resume                 = ata_pci_device_resume,
 164 #endif
 165 };
 166 
 167 module_pci_driver(jmicron_pci_driver);
 168 
 169 MODULE_AUTHOR("Alan Cox");
 170 MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
 171 MODULE_LICENSE("GPL");
 172 MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
 173 MODULE_VERSION(DRV_VERSION);
 174