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path: root/drivers/ata/pata_triflex.c
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Diffstat (limited to 'drivers/ata/pata_triflex.c')
-rw-r--r--drivers/ata/pata_triflex.c248
1 files changed, 248 insertions, 0 deletions
diff --git a/drivers/ata/pata_triflex.c b/drivers/ata/pata_triflex.c
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+++ b/drivers/ata/pata_triflex.c
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+/*
+ * pata_triflex.c - Compaq PATA for new ATA layer
+ * (C) 2005 Red Hat Inc
+ * Alan Cox <alan@lxorguk.ukuu.org.uk>
+ *
+ * based upon
+ *
+ * triflex.c
+ *
+ * IDE Chipset driver for the Compaq TriFlex IDE controller.
+ *
+ * Known to work with the Compaq Workstation 5x00 series.
+ *
+ * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
+ * Author: Torben Mathiasen <torben.mathiasen@hp.com>
+ *
+ * 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:
+ * Not publicly available.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/blkdev.h>
+#include <linux/delay.h>
+#include <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_triflex"
+#define DRV_VERSION "0.2.8"
+
+/**
+ * triflex_prereset - probe begin
+ * @link: ATA link
+ * @deadline: deadline jiffies for the operation
+ *
+ * Set up cable type and use generic probe init
+ */
+
+static int triflex_prereset(struct ata_link *link, unsigned long deadline)
+{
+ static const struct pci_bits triflex_enable_bits[] = {
+ { 0x80, 1, 0x01, 0x01 },
+ { 0x80, 1, 0x02, 0x02 }
+ };
+
+ struct ata_port *ap = link->ap;
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+ if (!pci_test_config_bits(pdev, &triflex_enable_bits[ap->port_no]))
+ return -ENOENT;
+
+ return ata_sff_prereset(link, deadline);
+}
+
+
+
+/**
+ * triflex_load_timing - timing configuration
+ * @ap: ATA interface
+ * @adev: Device on the bus
+ * @speed: speed to configure
+ *
+ * The Triflex has one set of timings per device per channel. This
+ * means we must do some switching. As the PIO and DMA timings don't
+ * match we have to do some reloading unlike PIIX devices where tuning
+ * tricks can avoid it.
+ */
+
+static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
+{
+ struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+ u32 timing = 0;
+ u32 triflex_timing, old_triflex_timing;
+ int channel_offset = ap->port_no ? 0x74: 0x70;
+ unsigned int is_slave = (adev->devno != 0);
+
+
+ pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
+ triflex_timing = old_triflex_timing;
+
+ switch(speed)
+ {
+ case XFER_MW_DMA_2:
+ timing = 0x0103;break;
+ case XFER_MW_DMA_1:
+ timing = 0x0203;break;
+ case XFER_MW_DMA_0:
+ timing = 0x0808;break;
+ case XFER_SW_DMA_2:
+ case XFER_SW_DMA_1:
+ case XFER_SW_DMA_0:
+ timing = 0x0F0F;break;
+ case XFER_PIO_4:
+ timing = 0x0202;break;
+ case XFER_PIO_3:
+ timing = 0x0204;break;
+ case XFER_PIO_2:
+ timing = 0x0404;break;
+ case XFER_PIO_1:
+ timing = 0x0508;break;
+ case XFER_PIO_0:
+ timing = 0x0808;break;
+ default:
+ BUG();
+ }
+ triflex_timing &= ~ (0xFFFF << (16 * is_slave));
+ triflex_timing |= (timing << (16 * is_slave));
+
+ if (triflex_timing != old_triflex_timing)
+ pci_write_config_dword(pdev, channel_offset, triflex_timing);
+}
+
+/**
+ * triflex_set_piomode - set initial PIO mode data
+ * @ap: ATA interface
+ * @adev: ATA device
+ *
+ * Use the timing loader to set up the PIO mode. We have to do this
+ * because DMA start/stop will only be called once DMA occurs. If there
+ * has been no DMA then the PIO timings are still needed.
+ */
+static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+ triflex_load_timing(ap, adev, adev->pio_mode);
+}
+
+/**
+ * triflex_dma_start - DMA start callback
+ * @qc: Command in progress
+ *
+ * Usually drivers set the DMA timing at the point the set_dmamode call
+ * is made. Triflex however requires we load new timings on the
+ * transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
+ * We load the DMA timings just before starting DMA and then restore
+ * the PIO timing when the DMA is finished.
+ */
+
+static void triflex_bmdma_start(struct ata_queued_cmd *qc)
+{
+ triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
+ ata_bmdma_start(qc);
+}
+
+/**
+ * triflex_dma_stop - DMA stop callback
+ * @ap: ATA interface
+ * @adev: ATA device
+ *
+ * We loaded new timings in dma_start, as a result we need to restore
+ * the PIO timings in dma_stop so that the next command issue gets the
+ * right clock values.
+ */
+
+static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
+{
+ ata_bmdma_stop(qc);
+ triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
+}
+
+static struct scsi_host_template triflex_sht = {
+ ATA_BMDMA_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations triflex_port_ops = {
+ .inherits = &ata_bmdma_port_ops,
+ .bmdma_start = triflex_bmdma_start,
+ .bmdma_stop = triflex_bmdma_stop,
+ .cable_detect = ata_cable_40wire,
+ .set_piomode = triflex_set_piomode,
+ .prereset = triflex_prereset,
+};
+
+static int triflex_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,
+ .port_ops = &triflex_port_ops
+ };
+ const struct ata_port_info *ppi[] = { &info, NULL };
+
+ ata_print_version_once(&dev->dev, DRV_VERSION);
+
+ return ata_pci_bmdma_init_one(dev, ppi, &triflex_sht, NULL, 0);
+}
+
+static const struct pci_device_id triflex[] = {
+ { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), },
+
+ { },
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int triflex_ata_pci_device_suspend(struct pci_dev *pdev, pm_message_t mesg)
+{
+ struct ata_host *host = pci_get_drvdata(pdev);
+ int rc = 0;
+
+ rc = ata_host_suspend(host, mesg);
+ if (rc)
+ return rc;
+
+ /*
+ * We must not disable or powerdown the device.
+ * APM bios refuses to suspend if IDE is not accessible.
+ */
+ pci_save_state(pdev);
+
+ return 0;
+}
+
+#endif
+
+static struct pci_driver triflex_pci_driver = {
+ .name = DRV_NAME,
+ .id_table = triflex,
+ .probe = triflex_init_one,
+ .remove = ata_pci_remove_one,
+#ifdef CONFIG_PM_SLEEP
+ .suspend = triflex_ata_pci_device_suspend,
+ .resume = ata_pci_device_resume,
+#endif
+};
+
+module_pci_driver(triflex_pci_driver);
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, triflex);
+MODULE_VERSION(DRV_VERSION);