239 lines
6.7 KiB
C
239 lines
6.7 KiB
C
/*
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* pata-cs5535.c - CS5535 PATA for new ATA layer
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* (C) 2005-2006 Red Hat Inc
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* Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* based upon cs5535.c from AMD <Jens.Altmann@amd.com> as cleaned up and
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* made readable and Linux style by Wolfgang Zuleger <wolfgang.zuleger@gmx.de
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* and Alexander Kiausch <alex.kiausch@t-online.de>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Loosely based on the piix & svwks drivers.
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*
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* Documentation:
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* Available from AMD web site.
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* TODO
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* Review errata to see if serializing is necessary
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/blkdev.h>
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#include <linux/delay.h>
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#include <scsi/scsi_host.h>
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#include <linux/libata.h>
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#include <asm/msr.h>
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#define DRV_NAME "cs5535"
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#define DRV_VERSION "0.2.12"
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/*
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* The Geode (Aka Athlon GX now) uses an internal MSR based
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* bus system for control. Demented but there you go.
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*/
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#define MSR_ATAC_BASE 0x51300000
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#define ATAC_GLD_MSR_CAP (MSR_ATAC_BASE+0)
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#define ATAC_GLD_MSR_CONFIG (MSR_ATAC_BASE+0x01)
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#define ATAC_GLD_MSR_SMI (MSR_ATAC_BASE+0x02)
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#define ATAC_GLD_MSR_ERROR (MSR_ATAC_BASE+0x03)
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#define ATAC_GLD_MSR_PM (MSR_ATAC_BASE+0x04)
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#define ATAC_GLD_MSR_DIAG (MSR_ATAC_BASE+0x05)
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#define ATAC_IO_BAR (MSR_ATAC_BASE+0x08)
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#define ATAC_RESET (MSR_ATAC_BASE+0x10)
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#define ATAC_CH0D0_PIO (MSR_ATAC_BASE+0x20)
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#define ATAC_CH0D0_DMA (MSR_ATAC_BASE+0x21)
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#define ATAC_CH0D1_PIO (MSR_ATAC_BASE+0x22)
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#define ATAC_CH0D1_DMA (MSR_ATAC_BASE+0x23)
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#define ATAC_PCI_ABRTERR (MSR_ATAC_BASE+0x24)
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#define ATAC_BM0_CMD_PRIM 0x00
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#define ATAC_BM0_STS_PRIM 0x02
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#define ATAC_BM0_PRD 0x04
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#define CS5535_CABLE_DETECT 0x48
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#define CS5535_BAD_PIO(timings) ( (timings&~0x80000000UL)==0x00009172 )
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/**
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* cs5535_cable_detect - detect cable type
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* @ap: Port to detect on
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*
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* Perform cable detection for ATA66 capable cable. Return a libata
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* cable type.
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*/
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static int cs5535_cable_detect(struct ata_port *ap)
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{
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u8 cable;
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struct pci_dev *pdev = to_pci_dev(ap->host->dev);
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pci_read_config_byte(pdev, CS5535_CABLE_DETECT, &cable);
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if (cable & 1)
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return ATA_CBL_PATA80;
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else
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return ATA_CBL_PATA40;
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}
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/**
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* cs5535_set_piomode - PIO setup
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* @ap: ATA interface
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* @adev: device on the interface
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*
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* Set our PIO requirements. The CS5535 is pretty clean about all this
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*/
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static void cs5535_set_piomode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u16 pio_timings[5] = {
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0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
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};
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static const u16 pio_cmd_timings[5] = {
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0xF7F4, 0x53F3, 0x13F1, 0x5131, 0x1131
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};
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u32 reg, dummy;
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struct ata_device *pair = ata_dev_pair(adev);
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int mode = adev->pio_mode - XFER_PIO_0;
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int cmdmode = mode;
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/* Command timing has to be for the lowest of the pair of devices */
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if (pair) {
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int pairmode = pair->pio_mode - XFER_PIO_0;
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cmdmode = min(mode, pairmode);
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/* Write the other drive timing register if it changed */
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if (cmdmode < pairmode)
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wrmsr(ATAC_CH0D0_PIO + 2 * pair->devno,
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pio_cmd_timings[cmdmode] << 16 | pio_timings[pairmode], 0);
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}
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/* Write the drive timing register */
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wrmsr(ATAC_CH0D0_PIO + 2 * adev->devno,
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pio_cmd_timings[cmdmode] << 16 | pio_timings[mode], 0);
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/* Set the PIO "format 1" bit in the DMA timing register */
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rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
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wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg | 0x80000000UL, 0);
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}
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/**
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* cs5535_set_dmamode - DMA timing setup
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* @ap: ATA interface
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* @adev: Device being configured
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*
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*/
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static void cs5535_set_dmamode(struct ata_port *ap, struct ata_device *adev)
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{
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static const u32 udma_timings[5] = {
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0x7F7436A1, 0x7F733481, 0x7F723261, 0x7F713161, 0x7F703061
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};
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static const u32 mwdma_timings[3] = {
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0x7F0FFFF3, 0x7F035352, 0x7F024241
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};
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u32 reg, dummy;
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int mode = adev->dma_mode;
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rdmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, dummy);
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reg &= 0x80000000UL;
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if (mode >= XFER_UDMA_0)
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reg |= udma_timings[mode - XFER_UDMA_0];
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else
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reg |= mwdma_timings[mode - XFER_MW_DMA_0];
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wrmsr(ATAC_CH0D0_DMA + 2 * adev->devno, reg, 0);
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}
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static struct scsi_host_template cs5535_sht = {
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ATA_BMDMA_SHT(DRV_NAME),
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};
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static struct ata_port_operations cs5535_port_ops = {
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.inherits = &ata_bmdma_port_ops,
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.cable_detect = cs5535_cable_detect,
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.set_piomode = cs5535_set_piomode,
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.set_dmamode = cs5535_set_dmamode,
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};
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/**
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* cs5535_init_one - Initialise a CS5530
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* @dev: PCI device
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* @id: Entry in match table
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*
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* Install a driver for the newly found CS5530 companion chip. Most of
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* this is just housekeeping. We have to set the chip up correctly and
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* turn off various bits of emulation magic.
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*/
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static int cs5535_init_one(struct pci_dev *dev, const struct pci_device_id *id)
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{
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static const struct ata_port_info info = {
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.flags = ATA_FLAG_SLAVE_POSS,
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.pio_mask = 0x1f,
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.mwdma_mask = 0x07,
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.udma_mask = ATA_UDMA4,
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.port_ops = &cs5535_port_ops
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};
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const struct ata_port_info *ppi[] = { &info, &ata_dummy_port_info };
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u32 timings, dummy;
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/* Check the BIOS set the initial timing clock. If not set the
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timings for PIO0 */
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rdmsr(ATAC_CH0D0_PIO, timings, dummy);
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if (CS5535_BAD_PIO(timings))
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wrmsr(ATAC_CH0D0_PIO, 0xF7F4F7F4UL, 0);
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rdmsr(ATAC_CH0D1_PIO, timings, dummy);
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if (CS5535_BAD_PIO(timings))
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wrmsr(ATAC_CH0D1_PIO, 0xF7F4F7F4UL, 0);
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return ata_pci_sff_init_one(dev, ppi, &cs5535_sht, NULL);
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}
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static const struct pci_device_id cs5535[] = {
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{ PCI_VDEVICE(NS, 0x002D), },
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{ },
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};
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static struct pci_driver cs5535_pci_driver = {
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.name = DRV_NAME,
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.id_table = cs5535,
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.probe = cs5535_init_one,
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.remove = ata_pci_remove_one,
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#ifdef CONFIG_PM
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.suspend = ata_pci_device_suspend,
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.resume = ata_pci_device_resume,
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#endif
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};
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static int __init cs5535_init(void)
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{
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return pci_register_driver(&cs5535_pci_driver);
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}
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static void __exit cs5535_exit(void)
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{
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pci_unregister_driver(&cs5535_pci_driver);
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}
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MODULE_AUTHOR("Alan Cox, Jens Altmann, Wolfgan Zuleger, Alexander Kiausch");
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MODULE_DESCRIPTION("low-level driver for the NS/AMD 5530");
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MODULE_LICENSE("GPL");
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MODULE_DEVICE_TABLE(pci, cs5535);
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MODULE_VERSION(DRV_VERSION);
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module_init(cs5535_init);
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module_exit(cs5535_exit);
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