/*
* pata-cs5535.c - CS5535 PATA for new ATA layer
* (C) 2005-2006 Red Hat Inc
* Alan Cox <alan@redhat.com>
*
* based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
* made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de
* and Alexander Kiausch <alex.kiausch@t-online.de>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Loosely based on the piix & svwks drivers.
*
* Documentation:
* Available from AMD web site.
* TODO
* Review errata to see if serializing is neccessary
*/
#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 <asm/msr.h>
#define DRV_NAME "cs5535"
#define DRV_VERSION "0.2.10"
/*
* The Geode (Aka Athlon GX now) uses an internal MSR based
* bus system for control. Demented but there you go.
*/
#define MSR_ATAC_BASE 0x51300000
#define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0)
#define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01)
#define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02)
#define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03)
#define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04)
#define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05)
#define ATAC_IO_BAR (MSR_ATAC_BASE+0x08)
#define ATAC_RESET (MSR_ATAC_BASE+0x10)
#define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20)
#define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21)
#define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22)
#define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23)
#define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24)
#define ATAC_BM0_CMD_PRIM 0x00
#define ATAC_BM0_STS_PRIM 0x02
#define ATAC_BM0_PRD 0x04
#define CS5535_CABLE_DETECT 0x48
#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL)==0x00009172 )
/**
* cs5535_pre_reset - detect cable type
* @ap: Port to detect on
*
* Perform cable detection for ATA66 capable cable. Return a libata
* cable type.
*/
static int cs5535_pre_reset(struct ata_port *ap)
{
u8 cable;
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
if (cable & 1)
ap->cbl = ATA_CBL_PATA80;
else
ap->cbl = ATA_CBL_PATA40;
return ata_std_prereset(ap);
}
/**
* cs5535_error_handler - reset/probe
* @ap: Port to reset
*
* Reset and configure a port
*/
static void cs5535_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, cs5535_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* cs5535_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
*
* Set our PIO requirements. The CS5535 is pretty clean about all this
*/
static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
{
static const u16 pio_timings[5] = {
0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
};
static const u16 pio_cmd_timings[5] = {
0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
};
u32 reg, dummy;
struct ata_device *pair = ata_dev_pair(adev);
int mode = adev->pio_mode - XFER_PIO_0;
int cmdmode = mode;
/* Command timing has to be for the lowest of the pair of devices */
if (pair) {
int pairmode = pair->pio_mode - XFER_PIO_0;
cmdmode = min(mode, pairmode);
/* Write the other drive timing register if it changed */
if (cmdmode < pairmode)
wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
}
/* Write the drive timing register */
wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
/* Set the PIO "format 1" bit in the DMA timing register */
rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
}
/**
* cs5535_set_dmamode - DMA timing setup
* @ap: ATA interface
* @adev: Device being configured
*
*/
static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
{
static const u32 udma_timings[5] = {
0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
};
static const u32 mwdma_timings[3] = {
0x7F0FFFF3, 0x7F035352, 0x7F024241
};
u32 reg, dummy;
int mode = adev->dma_mode;
rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
reg &= 0x80000000UL;
if (mode >= XFER_UDMA_0)
reg |= udma_timings[mode - XFER_UDMA_0];
else
reg |= mwdma_timings[mode - XFER_MW_DMA_0];
wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
}
static struct scsi_host_template cs5535_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 cs5535_port_ops = {
.port_disable = ata_port_disable,
.set_piomode = cs5535_set_piomode,
.set_dmamode = cs5535_set_dmamode,
.mode_filter = ata_pci_default_filter,
.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 = cs5535_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
};
/**
* cs5535_init_one - Initialise a CS5530
* @dev: PCI device
* @id: Entry in match table
*
* Install a driver for the newly found CS5530 companion chip. Most of
* this is just housekeeping. We have to set the chip up correctly and
* turn off various bits of emulation magic.
*/
static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
static struct ata_port_info info = {
.sht = &cs5535_sht,
.flags = ATA_FLAG_SLAVE_POSS|ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x1f,
.port_ops = &cs5535_port_ops
};
struct ata_port_info *ports[1] = { &info };
u32 timings, dummy;
/* Check the BIOS set the initial timing clock. If not set the
timings for PIO0 */
rdmsr(ATAC_CH0D0_PIO, timings, dummy);
if (CS5535_BAD_PIO(timings))
wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
rdmsr(ATAC_CH0D1_PIO, timings, dummy);
if (CS5535_BAD_PIO(timings))
wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
return ata_pci_init_one(dev, ports, 1);
}
static struct pci_device_id cs5535[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_NS, 0x002D), },
{ 0, },
};
static struct pci_driver cs5535_pci_driver = {
.name = DRV_NAME,
.id_table = cs5535,
.probe = cs5535_init_one,
.remove = ata_pci_remove_one
};
static int __init cs5535_init(void)
{
return pci_register_driver(&cs5535_pci_driver);
}
static void __exit cs5535_exit(void)
{
pci_unregister_driver(&cs5535_pci_driver);
}
MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cs5535);
MODULE_VERSION(DRV_VERSION);
module_init(cs5535_init);
module_exit(cs5535_exit);
