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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer4 * (C) 2006 Red Hat Inc5 */6 7#include <linux/kernel.h>8#include <linux/module.h>9#include <linux/pci.h>10#include <linux/blkdev.h>11#include <linux/delay.h>12#include <scsi/scsi_host.h>13#include <linux/libata.h>14 15#define DRV_NAME "pata_ns87410"16#define DRV_VERSION "0.4.6"17 18/**19 * ns87410_pre_reset - probe begin20 * @link: ATA link21 * @deadline: deadline jiffies for the operation22 *23 * Check enabled ports24 */25 26static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline)27{28 struct ata_port *ap = link->ap;29 struct pci_dev *pdev = to_pci_dev(ap->host->dev);30 static const struct pci_bits ns87410_enable_bits[] = {31 { 0x43, 1, 0x08, 0x08 },32 { 0x47, 1, 0x08, 0x08 }33 };34 35 if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no]))36 return -ENOENT;37 38 return ata_sff_prereset(link, deadline);39}40 41/**42 * ns87410_set_piomode - set initial PIO mode data43 * @ap: ATA interface44 * @adev: ATA device45 *46 * Program timing data. This is kept per channel not per device,47 * and only affects the data port.48 */49 50static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)51{52 struct pci_dev *pdev = to_pci_dev(ap->host->dev);53 int port = 0x40 + 4 * ap->port_no;54 u8 idetcr, idefr;55 struct ata_timing at;56 57 static const u8 activebits[15] = {58 0, 1, 2, 3, 4,59 5, 5, 6, 6, 6,60 6, 7, 7, 7, 761 };62 63 static const u8 recoverbits[12] = {64 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 765 };66 67 pci_read_config_byte(pdev, port + 3, &idefr);68 69 if (ata_pio_need_iordy(adev))70 idefr |= 0x04; /* IORDY enable */71 else72 idefr &= ~0x04;73 74 if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {75 dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode);76 return;77 }78 79 at.active = clamp_val(at.active, 2, 16) - 2;80 at.setup = clamp_val(at.setup, 1, 4) - 1;81 at.recover = clamp_val(at.recover, 1, 12) - 1;82 83 idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];84 85 pci_write_config_byte(pdev, port, idetcr);86 pci_write_config_byte(pdev, port + 3, idefr);87 /* We use ap->private_data as a pointer to the device currently88 loaded for timing */89 ap->private_data = adev;90}91 92/**93 * ns87410_qc_issue - command issue94 * @qc: command pending95 *96 * Called when the libata layer is about to issue a command. We wrap97 * this interface so that we can load the correct ATA timings if98 * necessary.99 */100 101static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc)102{103 struct ata_port *ap = qc->ap;104 struct ata_device *adev = qc->dev;105 106 /* If modes have been configured and the channel data is not loaded107 then load it. We have to check if pio_mode is set as the core code108 does not set adev->pio_mode to XFER_PIO_0 while probing as would be109 logical */110 111 if (adev->pio_mode && adev != ap->private_data)112 ns87410_set_piomode(ap, adev);113 114 return ata_sff_qc_issue(qc);115}116 117static const struct scsi_host_template ns87410_sht = {118 ATA_PIO_SHT(DRV_NAME),119};120 121static struct ata_port_operations ns87410_port_ops = {122 .inherits = &ata_sff_port_ops,123 .qc_issue = ns87410_qc_issue,124 .cable_detect = ata_cable_40wire,125 .set_piomode = ns87410_set_piomode,126 .prereset = ns87410_pre_reset,127};128 129static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)130{131 static const struct ata_port_info info = {132 .flags = ATA_FLAG_SLAVE_POSS,133 .pio_mask = ATA_PIO3,134 .port_ops = &ns87410_port_ops135 };136 const struct ata_port_info *ppi[] = { &info, NULL };137 return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0);138}139 140static const struct pci_device_id ns87410[] = {141 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), },142 143 { },144};145 146static struct pci_driver ns87410_pci_driver = {147 .name = DRV_NAME,148 .id_table = ns87410,149 .probe = ns87410_init_one,150 .remove = ata_pci_remove_one,151#ifdef CONFIG_PM_SLEEP152 .suspend = ata_pci_device_suspend,153 .resume = ata_pci_device_resume,154#endif155};156 157module_pci_driver(ns87410_pci_driver);158 159MODULE_AUTHOR("Alan Cox");160MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");161MODULE_LICENSE("GPL");162MODULE_DEVICE_TABLE(pci, ns87410);163MODULE_VERSION(DRV_VERSION);164