/*
* IDE tuning and bus mastering support for the CS5510/CS5520
* chipsets
*
* The CS5510/CS5520 are slightly unusual devices. Unlike the
* typical IDE controllers they do bus mastering with the drive in
* PIO mode and smarter silicon.
*
* The practical upshot of this is that we must always tune the
* drive for the right PIO mode. We must also ignore all the blacklists
* and the drive bus mastering DMA information. Also to confuse matters
* further we can do DMA on PIO only drives.
*
* DMA on the 5510 also requires we disable_hlt() during DMA on early
* revisions.
*
* *** This driver is strictly experimental ***
*
* (c) Copyright Red Hat Inc 2002
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* Documentation:
* Not publically available.
*/
#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>
#define DRV_NAME "pata_cs5520"
#define DRV_VERSION "0.6.2"
struct pio_clocks
{
int address;
int assert;
int recovery;
};
static const struct pio_clocks cs5520_pio_clocks[]={
{3, 6, 11},
{2, 5, 6},
{1, 4, 3},
{1, 3, 2},
{1, 2, 1}
};
/**
* cs5520_set_timings - program PIO timings
* @ap: ATA port
* @adev: ATA device
*
* Program the PIO mode timings for the controller according to the pio
* clocking table.
*/
static void cs5520_set_timings(struct ata_port *ap, struct ata_device *adev, int pio)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
int slave = adev->devno;
pio -= XFER_PIO_0;
/* Channel command timing */
pci_write_config_byte(pdev, 0x62 + ap->port_no,
(cs5520_pio_clocks[pio].recovery << 4) |
(cs5520_pio_clocks[pio].assert));
/* FIXME: should these use address ? */
/* Read command timing */
pci_write_config_byte(pdev, 0x64 + 4*ap->port_no + slave,
(cs5520_pio_clocks[pio].recovery << 4) |
(cs5520_pio_clocks[pio].assert));
/* Write command timing */
pci_write_config_byte(pdev, 0x66 + 4*ap->port_no + slave,
(cs5520_pio_clocks[pio].recovery << 4) |
(cs5520_pio_clocks[pio].assert));
}
/**
* cs5520_enable_dma - turn on DMA bits
*
* Turn on the DMA bits for this disk. Needed because the BIOS probably
* has not done the work for us. Belongs in the core SATA code.
*/
static void cs5520_enable_dma(struct ata_port *ap, struct ata_device *adev)
{
/* Set the DMA enable/disable flag */
u8 reg = inb(ap->ioaddr.bmdma_addr + 0x02);
reg |= 1<<(adev->devno + 5);
outb(reg, ap->ioaddr.bmdma_addr + 0x02);
}
/**
* cs5520_set_dmamode - program DMA timings
* @ap: ATA port
* @adev: ATA device
*
* Program the DMA mode timings for the controller according to the pio
* clocking table. Note that this device sets the DMA timings to PIO
* mode values. This may seem bizarre but the 5520 architecture talks
* PIO mode to the disk and DMA mode to the controller so the underlying
* transfers are PIO timed.
*/
static void cs5520_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const int dma_xlate[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 };
cs5520_set_timings(ap, adev, dma_xlate[adev->dma_mode]);
cs5520_enable_dma(ap, adev);
}
/**
* cs5520_set_piomode - program PIO timings
* @ap: ATA port
* @adev: ATA device
*
* Program the PIO mode timings for the controller according to the pio
* clocking table. We know pio_mode will equal dma_mode because of the
* CS5520 architecture. At least once we turned DMA on and wrote a
* mode setter.
*/
static void cs5520_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
cs5520_set_timings(ap, adev, adev->pio_mode);
}
static int cs5520_pre_reset(struct ata_port *ap)
{
ap->cbl = ATA_CBL_PATA40;
return ata_std_prereset(ap);
}
static void cs5520_error_handler(struct ata_port *ap)
{
return ata_bmdma_drive_eh(ap, cs5520_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
static struct scsi_host_template cs5520_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,
.max_sectors = ATA_MAX_SECTORS,
.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,
.bios_param = ata_std_bios_param,
};
static struct ata_port_operations cs5520_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = cs5520_set_piomode,
.set_dmamode = cs5520_set_dmamode,
.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 = cs5520_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_pio_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 int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
u8 pcicfg;
static struct ata_probe_ent probe[2];
int ports = 0;
/* IDE port enable bits */
pci_read_config_byte(dev, 0x60, &pcicfg);
/* Check if the ATA ports are enabled */
if ((pcicfg & 3) == 0)
return -ENODEV;
if ((pcicfg & 0x40) == 0) {
printk(KERN_WARNING DRV_NAME ": DMA mode disabled. Enabling.\n");
pci_write_config_byte(dev, 0x60, pcicfg | 0x40);
}
/* Perform set up for DMA */
if (pci_enable_device_bars(dev, 1<<2)) {
printk(KERN_ERR DRV_NAME ": unable to configure BAR2.\n");
return -ENODEV;
}
pci_set_master(dev);
if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
printk(KERN_ERR DRV_NAME ": unable to configure DMA mask.\n");
return -ENODEV;
}
if (pci_set_consistent_dma_mask(dev, DMA_32BIT_MASK)) {
printk(KERN_ERR DRV_NAME ": unable to configure consistent DMA mask.\n");
return -ENODEV;
}
/* We have to do our own plumbing as the PCI setup for this
chipset is non-standard so we can't punt to the libata code */
INIT_LIST_HEAD(&probe[0].node);
probe[0].dev = pci_dev_to_dev(dev);
probe[0].port_ops = &cs5520_port_ops;
probe[0].sht = &cs5520_sht;
probe[0].pio_mask = 0x1F;
probe[0].mwdma_mask = id->driver_data;
probe[0].irq = 14;
probe[0].irq_flags = 0;
probe[0].port_flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST;
probe[0].n_ports = 1;
probe[0].port[0].cmd_addr = 0x1F0;
probe[0].port[0].ctl_addr = 0x3F6;
probe[0].port[0].altstatus_addr = 0x3F6;
probe[0].port[0].bmdma_addr = pci_resource_start(dev, 2);
/* The secondary lurks at different addresses but is otherwise
the same beastie */
probe[1] = probe[0];
INIT_LIST_HEAD(&probe[1].node);
probe[1].irq = 15;
probe[1].port[0].cmd_addr = 0x170;
probe[1].port[0].ctl_addr = 0x376;
probe[1].port[0].altstatus_addr = 0x376;
probe[1].port[0].bmdma_addr = pci_resource_start(dev, 2) + 8;
/* Let libata fill in the port details */
ata_std_ports(&probe[0].port[0]);
ata_std_ports(&probe[1].port[0]);
/* Now add the ports that are active */
if (pcicfg & 1)
ports += ata_device_add(&probe[0]);
if (pcicfg & 2)
ports += ata_device_add(&probe[1]);
if (ports)
return 0;
return -ENODEV;
}
/**
* cs5520_remove_one - device unload
* @pdev: PCI device being removed
*
* Handle an unplug/unload event for a PCI device. Unload the
* PCI driver but do not use the default handler as we manage
* resources ourself and *MUST NOT* disable the device as it has
* other functions.
*/
static void __devexit cs5520_remove_one(struct pci_dev *pdev)
{
struct device *dev = pci_dev_to_dev(pdev);
struct ata_host *host = dev_get_drvdata(dev);
ata_host_remove(host);
dev_set_drvdata(dev, NULL);
}
/* For now keep DMA off. We can set it for all but A rev CS5510 once the
core ATA code can handle it */
static const struct pci_device_id pata_cs5520[] = {
{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5510), },
{ PCI_VDEVICE(CYRIX, PCI_DEVICE_ID_CYRIX_5520), },
{ },
};
static struct pci_driver cs5520_pci_driver = {
.name = DRV_NAME,
.id_table = pata_cs5520,
.probe = cs5520_init_one,
.remove = cs5520_remove_one
};
static int __init cs5520_init(void)
{
return pci_register_driver(&cs5520_pci_driver);
}
static void __exit cs5520_exit(void)
{
pci_unregister_driver(&cs5520_pci_driver);
}
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("low-level driver for Cyrix CS5510/5520");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, pata_cs5520);
MODULE_VERSION(DRV_VERSION);
module_init(cs5520_init);
module_exit(cs5520_exit);
