linux/drivers/ata/pata_qdi.c

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/*
* pata_qdi.c - QDI VLB ATA controllers
* (C) 2006 Red Hat <alan@redhat.com>
*
* This driver mostly exists as a proof of concept for non PCI devices under
* libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly
* useful.
*
* Tuning code written from the documentation at
* http://www.ryston.cz/petr/vlb/qd6500.html
* http://www.ryston.cz/petr/vlb/qd6580.html
*
* Probe code based on drivers/ide/legacy/qd65xx.c
* Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
* Samuel Thibault <samuel.thibault@fnac.net>
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/platform_device.h>
#define DRV_NAME "pata_qdi"
#define DRV_VERSION "0.2.4"
#define NR_HOST 4 /* Two 6580s */
struct qdi_data {
unsigned long timing;
u8 clock[2];
u8 last;
int fast;
struct platform_device *platform_dev;
};
static struct ata_host *qdi_host[NR_HOST];
static struct qdi_data qdi_data[NR_HOST];
static int nr_qdi_host;
#ifdef MODULE
static int probe_qdi = 1;
#else
static int probe_qdi;
#endif
static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_timing t;
struct qdi_data *qdi = ap->host->private_data;
int active, recovery;
u8 timing;
/* Get the timing data in cycles */
ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
if (qdi->fast) {
active = 8 - FIT(t.active, 1, 8);
recovery = 18 - FIT(t.recover, 3, 18);
} else {
active = 9 - FIT(t.active, 2, 9);
recovery = 15 - FIT(t.recover, 0, 15);
}
timing = (recovery << 4) | active | 0x08;
qdi->clock[adev->devno] = timing;
outb(timing, qdi->timing);
}
static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
struct ata_timing t;
struct qdi_data *qdi = ap->host->private_data;
int active, recovery;
u8 timing;
/* Get the timing data in cycles */
ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
if (qdi->fast) {
active = 8 - FIT(t.active, 1, 8);
recovery = 18 - FIT(t.recover, 3, 18);
} else {
active = 9 - FIT(t.active, 2, 9);
recovery = 15 - FIT(t.recover, 0, 15);
}
timing = (recovery << 4) | active | 0x08;
qdi->clock[adev->devno] = timing;
outb(timing, qdi->timing);
/* Clear the FIFO */
if (adev->class != ATA_DEV_ATA)
outb(0x5F, (qdi->timing & 0xFFF0) + 3);
}
/**
* qdi_qc_issue_prot - command issue
* @qc: command pending
*
* Called when the libata layer is about to issue a command. We wrap
* this interface so that we can load the correct ATA timings.
*/
static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc)
{
struct ata_port *ap = qc->ap;
struct ata_device *adev = qc->dev;
struct qdi_data *qdi = ap->host->private_data;
if (qdi->clock[adev->devno] != qdi->last) {
if (adev->pio_mode) {
qdi->last = qdi->clock[adev->devno];
outb(qdi->clock[adev->devno], qdi->timing);
}
}
return ata_qc_issue_prot(qc);
}
static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
{
struct ata_port *ap = adev->ap;
int slop = buflen & 3;
if (ata_id_has_dword_io(adev->id)) {
if (write_data)
outsl(ap->ioaddr.data_addr, buf, buflen >> 2);
else
insl(ap->ioaddr.data_addr, buf, buflen >> 2);
if (unlikely(slop)) {
u32 pad;
if (write_data) {
memcpy(&pad, buf + buflen - slop, slop);
outl(le32_to_cpu(pad), ap->ioaddr.data_addr);
} else {
pad = cpu_to_le32(inl(ap->ioaddr.data_addr));
memcpy(buf + buflen - slop, &pad, slop);
}
}
} else
ata_pio_data_xfer(adev, buf, buflen, write_data);
}
static struct scsi_host_template qdi_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.slave_destroy = ata_scsi_slave_destroy,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations qdi6500_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = qdi6500_set_piomode,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ata_bmdma_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.qc_prep = ata_qc_prep,
.qc_issue = qdi_qc_issue_prot,
.data_xfer = qdi_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
static struct ata_port_operations qdi6580_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = qdi6580_set_piomode,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = ata_bmdma_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.qc_prep = ata_qc_prep,
.qc_issue = qdi_qc_issue_prot,
.data_xfer = qdi_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.port_start = ata_port_start,
.port_stop = ata_port_stop,
.host_stop = ata_host_stop
};
/**
* qdi_init_one - attach a qdi interface
* @type: Type to display
* @io: I/O port start
* @irq: interrupt line
* @fast: True if on a > 33Mhz VLB
*
* Register an ISA bus IDE interface. Such interfaces are PIO and we
* assume do not support IRQ sharing.
*/
static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast)
{
struct ata_probe_ent ae;
struct platform_device *pdev;
int ret;
unsigned long ctrl = io + 0x206;
/*
* Fill in a probe structure first of all
*/
pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
if (IS_ERR(pdev))
return PTR_ERR(pdev);
memset(&ae, 0, sizeof(struct ata_probe_ent));
INIT_LIST_HEAD(&ae.node);
ae.dev = &pdev->dev;
if (type == 6580) {
ae.port_ops = &qdi6580_port_ops;
ae.pio_mask = 0x1F;
} else {
ae.port_ops = &qdi6500_port_ops;
ae.pio_mask = 0x07; /* Actually PIO3 !IORDY is possible */
}
ae.sht = &qdi_sht;
ae.n_ports = 1;
ae.irq = irq;
ae.irq_flags = 0;
ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
ae.port[0].cmd_addr = io;
ae.port[0].altstatus_addr = ctrl;
ae.port[0].ctl_addr = ctrl;
ata_std_ports(&ae.port[0]);
/*
* Hook in a private data structure per channel
*/
ae.private_data = &qdi_data[nr_qdi_host];
qdi_data[nr_qdi_host].timing = port;
qdi_data[nr_qdi_host].fast = fast;
qdi_data[nr_qdi_host].platform_dev = pdev;
printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io);
ret = ata_device_add(&ae);
if (ret == 0) {
platform_device_unregister(pdev);
return -ENODEV;
}
qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev);
return 0;
}
/**
* qdi_init - attach qdi interfaces
*
* Attach qdi IDE interfaces by scanning the ports it may occupy.
*/
static __init int qdi_init(void)
{
unsigned long flags;
static const unsigned long qd_port[2] = { 0x30, 0xB0 };
static const unsigned long ide_port[2] = { 0x170, 0x1F0 };
static const int ide_irq[2] = { 14, 15 };
int ct = 0;
int i;
if (probe_qdi == 0)
return -ENODEV;
/*
* Check each possible QD65xx base address
*/
for (i = 0; i < 2; i++) {
unsigned long port = qd_port[i];
u8 r, res;
if (request_region(port, 2, "pata_qdi")) {
/* Check for a card */
local_irq_save(flags);
r = inb_p(port);
outb_p(0x19, port);
res = inb_p(port);
outb_p(r, port);
local_irq_restore(flags);
/* Fail */
if (res == 0x19)
{
release_region(port, 2);
continue;
}
/* Passes the presence test */
r = inb_p(port + 1); /* Check port agrees with port set */
if ((r & 2) >> 1 != i) {
release_region(port, 2);
continue;
}
/* Check card type */
if ((r & 0xF0) == 0xC0) {
/* QD6500: single channel */
if (r & 8) {
/* Disabled ? */
release_region(port, 2);
continue;
}
ct += qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04);
}
if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) {
/* QD6580: dual channel */
if (!request_region(port + 2 , 2, "pata_qdi"))
{
release_region(port, 2);
continue;
}
res = inb(port + 3);
if (res & 1) {
/* Single channel mode */
ct += qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04);
} else {
/* Dual channel mode */
ct += qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04);
ct += qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04);
}
}
}
}
if (ct != 0)
return 0;
return -ENODEV;
}
static __exit void qdi_exit(void)
{
int i;
for (i = 0; i < nr_qdi_host; i++) {
ata_host_remove(qdi_host[i]);
/* Free the control resource. The 6580 dual channel has the resources
* claimed as a pair of 2 byte resources so we need no special cases...
*/
release_region(qdi_data[i].timing, 2);
platform_device_unregister(qdi_data[i].platform_dev);
}
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for qdi ATA");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
module_init(qdi_init);
module_exit(qdi_exit);
module_param(probe_qdi, int, 0);