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Linux/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
  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     "0.1.5"
 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
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 
175 

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