pata_jmicron.c
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/*
* pata_jmicron.c - JMicron ATA driver for non AHCI mode. This drives the
* PATA port of the controller. The SATA ports are
* driven by AHCI in the usual configuration although
* this driver can handle other setups if we need it.
*
* (c) 2006 Red Hat
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>
#define DRV_NAME "pata_jmicron"
#define DRV_VERSION "0.1.5"
typedef enum {
PORT_PATA0 = 0,
PORT_PATA1 = 1,
PORT_SATA = 2,
} port_type;
/**
* jmicron_pre_reset - check for 40/80 pin
* @link: ATA link
* @deadline: deadline jiffies for the operation
*
* Perform the PATA port setup we need.
*
* On the Jmicron 361/363 there is a single PATA port that can be mapped
* either as primary or secondary (or neither). We don't do any policy
* and setup here. We assume that has been done by init_one and the
* BIOS.
*/
static int jmicron_pre_reset(struct ata_link *link, unsigned long deadline)
{
struct ata_port *ap = link->ap;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u32 control;
u32 control5;
int port_mask = 1<< (4 * ap->port_no);
int port = ap->port_no;
port_type port_map[2];
/* Check if our port is enabled */
pci_read_config_dword(pdev, 0x40, &control);
if ((control & port_mask) == 0)
return -ENOENT;
/* There are two basic mappings. One has the two SATA ports merged
as master/slave and the secondary as PATA, the other has only the
SATA port mapped */
if (control & (1 << 23)) {
port_map[0] = PORT_SATA;
port_map[1] = PORT_PATA0;
} else {
port_map[0] = PORT_SATA;
port_map[1] = PORT_SATA;
}
/* The 365/366 may have this bit set to map the second PATA port
as the internal primary channel */
pci_read_config_dword(pdev, 0x80, &control5);
if (control5 & (1<<24))
port_map[0] = PORT_PATA1;
/* The two ports may then be logically swapped by the firmware */
if (control & (1 << 22))
port = port ^ 1;
/*
* Now we know which physical port we are talking about we can
* actually do our cable checking etc. Thankfully we don't need
* to do the plumbing for other cases.
*/
switch (port_map[port]) {
case PORT_PATA0:
if ((control & (1 << 5)) == 0)
return -ENOENT;
if (control & (1 << 3)) /* 40/80 pin primary */
ap->cbl = ATA_CBL_PATA40;
else
ap->cbl = ATA_CBL_PATA80;
break;
case PORT_PATA1:
/* Bit 21 is set if the port is enabled */
if ((control5 & (1 << 21)) == 0)
return -ENOENT;
if (control5 & (1 << 19)) /* 40/80 pin secondary */
ap->cbl = ATA_CBL_PATA40;
else
ap->cbl = ATA_CBL_PATA80;
break;
case PORT_SATA:
ap->cbl = ATA_CBL_SATA;
break;
}
return ata_sff_prereset(link, deadline);
}
/* No PIO or DMA methods needed for this device */
static struct scsi_host_template jmicron_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations jmicron_ops = {
.inherits = &ata_bmdma_port_ops,
.prereset = jmicron_pre_reset,
};
/**
* jmicron_init_one - Register Jmicron ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in jmicron_pci_tbl matching with @pdev
*
* Called from kernel PCI layer.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int jmicron_init_one (struct pci_dev *pdev, const struct pci_device_id *id)
{
static const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA5,
.port_ops = &jmicron_ops,
};
const struct ata_port_info *ppi[] = { &info, NULL };
return ata_pci_bmdma_init_one(pdev, ppi, &jmicron_sht, NULL, 0);
}
static const struct pci_device_id jmicron_pci_tbl[] = {
{ PCI_VENDOR_ID_JMICRON, PCI_ANY_ID, PCI_ANY_ID, PCI_ANY_ID,
PCI_CLASS_STORAGE_IDE << 8, 0xffff00, 0 },
{ } /* terminate list */
};
static struct pci_driver jmicron_pci_driver = {
.name = DRV_NAME,
.id_table = jmicron_pci_tbl,
.probe = jmicron_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM_SLEEP
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
module_pci_driver(jmicron_pci_driver);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for Jmicron PATA ports");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, jmicron_pci_tbl);
MODULE_VERSION(DRV_VERSION);