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163 lines
4.1 KiB
163 lines
4.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer |
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* (C) 2006 Red Hat Inc |
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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/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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#define DRV_NAME "pata_ns87410" |
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#define DRV_VERSION "0.4.6" |
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/** |
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* ns87410_pre_reset - probe begin |
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* @link: ATA link |
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* @deadline: deadline jiffies for the operation |
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* |
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* Check enabled ports |
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*/ |
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static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline) |
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{ |
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struct ata_port *ap = link->ap; |
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struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
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static const struct pci_bits ns87410_enable_bits[] = { |
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{ 0x43, 1, 0x08, 0x08 }, |
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{ 0x47, 1, 0x08, 0x08 } |
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}; |
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if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) |
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return -ENOENT; |
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return ata_sff_prereset(link, deadline); |
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} |
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/** |
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* ns87410_set_piomode - set initial PIO mode data |
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* @ap: ATA interface |
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* @adev: ATA device |
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* |
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* Program timing data. This is kept per channel not per device, |
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* and only affects the data port. |
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*/ |
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static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev) |
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{ |
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struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
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int port = 0x40 + 4 * ap->port_no; |
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u8 idetcr, idefr; |
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struct ata_timing at; |
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static const u8 activebits[15] = { |
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0, 1, 2, 3, 4, |
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5, 5, 6, 6, 6, |
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6, 7, 7, 7, 7 |
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}; |
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static const u8 recoverbits[12] = { |
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0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 |
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}; |
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pci_read_config_byte(pdev, port + 3, &idefr); |
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if (ata_pio_need_iordy(adev)) |
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idefr |= 0x04; /* IORDY enable */ |
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else |
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idefr &= ~0x04; |
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if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) { |
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dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode); |
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return; |
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} |
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at.active = clamp_val(at.active, 2, 16) - 2; |
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at.setup = clamp_val(at.setup, 1, 4) - 1; |
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at.recover = clamp_val(at.recover, 1, 12) - 1; |
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idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active]; |
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pci_write_config_byte(pdev, port, idetcr); |
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pci_write_config_byte(pdev, port + 3, idefr); |
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/* We use ap->private_data as a pointer to the device currently |
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loaded for timing */ |
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ap->private_data = adev; |
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} |
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/** |
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* ns87410_qc_issue - command issue |
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* @qc: command pending |
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* |
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* Called when the libata layer is about to issue a command. We wrap |
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* this interface so that we can load the correct ATA timings if |
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* necessary. |
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*/ |
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static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc) |
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{ |
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struct ata_port *ap = qc->ap; |
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struct ata_device *adev = qc->dev; |
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/* If modes have been configured and the channel data is not loaded |
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then load it. We have to check if pio_mode is set as the core code |
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does not set adev->pio_mode to XFER_PIO_0 while probing as would be |
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logical */ |
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if (adev->pio_mode && adev != ap->private_data) |
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ns87410_set_piomode(ap, adev); |
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return ata_sff_qc_issue(qc); |
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} |
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static struct scsi_host_template ns87410_sht = { |
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ATA_PIO_SHT(DRV_NAME), |
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}; |
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static struct ata_port_operations ns87410_port_ops = { |
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.inherits = &ata_sff_port_ops, |
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.qc_issue = ns87410_qc_issue, |
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.cable_detect = ata_cable_40wire, |
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.set_piomode = ns87410_set_piomode, |
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.prereset = ns87410_pre_reset, |
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}; |
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static int ns87410_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 = ATA_PIO3, |
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.port_ops = &ns87410_port_ops |
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}; |
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const struct ata_port_info *ppi[] = { &info, NULL }; |
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return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0); |
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} |
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static const struct pci_device_id ns87410[] = { |
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{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, |
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{ }, |
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}; |
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static struct pci_driver ns87410_pci_driver = { |
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.name = DRV_NAME, |
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.id_table = ns87410, |
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.probe = ns87410_init_one, |
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.remove = ata_pci_remove_one, |
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#ifdef CONFIG_PM_SLEEP |
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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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module_pci_driver(ns87410_pci_driver); |
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MODULE_AUTHOR("Alan Cox"); |
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MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); |
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MODULE_LICENSE("GPL"); |
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MODULE_DEVICE_TABLE(pci, ns87410); |
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MODULE_VERSION(DRV_VERSION);
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