/* * 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 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_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 }; static int printed_version; if (!printed_version++) dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); return ata_pci_sff_init_one(dev, ppi, &triflex_sht, NULL); } static const struct pci_device_id triflex[] = { { PCI_VDEVICE(COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE), }, { }, }; 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 .suspend = ata_pci_device_suspend, .resume = ata_pci_device_resume, #endif }; static int __init triflex_init(void) { return pci_register_driver(&triflex_pci_driver); } static void __exit triflex_exit(void) { pci_unregister_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); module_init(triflex_init); module_exit(triflex_exit);