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pata_cs5535.c
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pata_cs5535.c
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/*
* pata-cs5535.c - CS5535 PATA for new ATA layer
* (C) 2005-2006 Red Hat Inc
* Alan Cox <[email protected]>
*
* based upon cs5535.c from AMD <[email protected]> as cleaned up and
* made readable and Linux style by Wolfgang Zuleger <[email protected]>
* and Alexander Kiausch <[email protected]>
*
* 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 necessary
*/
#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 "pata_cs5535"
#define DRV_VERSION "0.2.12"
/*
* 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
/**
* cs5535_cable_detect - detect cable type
* @ap: Port to detect on
*
* Perform cable detection for ATA66 capable cable. Return a libata
* cable type.
*/
static int cs5535_cable_detect(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)
return ATA_CBL_PATA80;
else
return ATA_CBL_PATA40;
}
/**
* 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, 0xF173, 0x8141, 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 = {
ATA_BMDMA_SHT(DRV_NAME),
};
static struct ata_port_operations cs5535_port_ops = {
.inherits = &ata_bmdma_port_ops,
.cable_detect = cs5535_cable_detect,
.set_piomode = cs5535_set_piomode,
.set_dmamode = cs5535_set_dmamode,
};
/**
* 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 const struct ata_port_info info = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = ATA_PIO4,
.mwdma_mask = ATA_MWDMA2,
.udma_mask = ATA_UDMA4,
.port_ops = &cs5535_port_ops
};
const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
return ata_pci_bmdma_init_one(dev, ppi, &cs5535_sht, NULL, 0);
}
static const struct pci_device_id cs5535[] = {
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_CS5535_IDE), },
{ PCI_VDEVICE(AMD, PCI_DEVICE_ID_AMD_CS5535_IDE), },
{ },
};
static struct pci_driver cs5535_pci_driver = {
.name = DRV_NAME,
.id_table = cs5535,
.probe = cs5535_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
module_pci_driver(cs5535_pci_driver);
MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
MODULE_DESCRIPTION("low-level driver for the NS/AMD 5535");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, cs5535);
MODULE_VERSION(DRV_VERSION);