// SPDX-License-Identifier: GPL-2.0-only /* * pata_sl82c105.c - SL82C105 PATA for new ATA layer * (C) 2005 Red Hat Inc * (C) 2011 Bartlomiej Zolnierkiewicz * * Based in part on linux/drivers/ide/pci/sl82c105.c * SL82C105/Winbond 553 IDE driver * * and in part on the documentation and errata sheet * * * Note: The controller like many controllers has shared timings for * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back * in the dma_stop function. Thus we actually don't need a set_dmamode * method as the PIO method is always called and will set the right PIO * timing parameters. */ #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 … #define DRV_VERSION … enum { … }; /** * sl82c105_pre_reset - probe begin * @link: ATA link * @deadline: deadline jiffies for the operation * * Set up cable type and use generic probe init */ static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline) { … } /** * sl82c105_configure_piomode - set chip PIO timing * @ap: ATA interface * @adev: ATA device * @pio: PIO mode * * Called to do the PIO mode setup. Our timing registers are shared * so a configure_dmamode call will undo any work we do here and vice * versa */ static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio) { … } /** * sl82c105_set_piomode - set initial PIO mode data * @ap: ATA interface * @adev: ATA device * * Called to do the PIO mode setup. Our timing registers are shared * but we want to set the PIO timing by default. */ static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev) { … } /** * sl82c105_configure_dmamode - set DMA mode in chip * @ap: ATA interface * @adev: ATA device * * Load DMA cycle times into the chip ready for a DMA transfer * to occur. */ static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev) { … } /** * sl82c105_reset_engine - Reset the DMA engine * @ap: ATA interface * * The sl82c105 has some serious problems with the DMA engine * when transfers don't run as expected or ATAPI is used. The * recommended fix is to reset the engine each use using a chip * test register. */ static void sl82c105_reset_engine(struct ata_port *ap) { … } /** * sl82c105_bmdma_start - DMA engine begin * @qc: ATA command * * Reset the DMA engine each use as recommended by the errata * document. * * FIXME: if we switch clock at BMDMA start/end we might get better * PIO performance on DMA capable devices. */ static void sl82c105_bmdma_start(struct ata_queued_cmd *qc) { … } /** * sl82c105_bmdma_stop - DMA engine stop * @qc: ATA command * * Reset the DMA engine each use as recommended by the errata * document. * * This function is also called to turn off DMA when a timeout occurs * during DMA operation. In both cases we need to reset the engine. * * We assume bmdma_stop is always called if bmdma_start as called. If * not then we may need to wrap qc_issue. */ static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc) { … } /** * sl82c105_qc_defer - implement serialization * @qc: command * * We must issue one command per host not per channel because * of the reset bug. * * Q: is the scsi host lock sufficient ? */ static int sl82c105_qc_defer(struct ata_queued_cmd *qc) { … } static bool sl82c105_sff_irq_check(struct ata_port *ap) { … } static const struct scsi_host_template sl82c105_sht = …; static struct ata_port_operations sl82c105_port_ops = …; /** * sl82c105_bridge_revision - find bridge version * @pdev: PCI device for the ATA function * * Locates the PCI bridge associated with the ATA function and * providing it is a Winbond 553 reports the revision. If it cannot * find a revision or the right device it returns -1 */ static int sl82c105_bridge_revision(struct pci_dev *pdev) { … } static void sl82c105_fixup(struct pci_dev *pdev) { … } static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id) { … } #ifdef CONFIG_PM_SLEEP static int sl82c105_reinit_one(struct pci_dev *pdev) { … } #endif static const struct pci_device_id sl82c105[] = …; static struct pci_driver sl82c105_pci_driver = …; module_pci_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_DEVICE_TABLE(pci, sl82c105); MODULE_VERSION(…);
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