1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer 4 * (C) 2006 Red Hat Inc 5 */ 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 begin 20 * @link: ATA link 21 * @deadline: deadline jiffies for the operation 22 * 23 * Check enabled ports 24 */ 25 26 static 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 data 43 * @ap: ATA interface 44 * @adev: ATA device 45 * 46 * Program timing data. This is kept per channel not per device, 47 * and only affects the data port. 48 */ 49 50 static 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, 7 61 }; 62 63 static const u8 recoverbits[12] = { 64 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 65 }; 66 67 pci_read_config_byte(pdev, port + 3, &idefr); 68 69 if (ata_pio_need_iordy(adev)) 70 idefr |= 0x04; /* IORDY enable */ 71 else 72 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 currently 88 loaded for timing */ 89 ap->private_data = adev; 90 } 91 92 /** 93 * ns87410_qc_issue - command issue 94 * @qc: command pending 95 * 96 * Called when the libata layer is about to issue a command. We wrap 97 * this interface so that we can load the correct ATA timings if 98 * necessary. 99 */ 100 101 static 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 loaded 107 then load it. We have to check if pio_mode is set as the core code 108 does not set adev->pio_mode to XFER_PIO_0 while probing as would be 109 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 } 116 117 static struct scsi_host_template ns87410_sht = { 118 ATA_PIO_SHT(DRV_NAME), 119 }; 120 121 static 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 }; 128 129 static 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_ops 135 }; 136 const struct ata_port_info *ppi[] = { &info, NULL }; 137 return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0); 138 } 139 140 static const struct pci_device_id ns87410[] = { 141 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, 142 143 { }, 144 }; 145 146 static 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_SLEEP 152 .suspend = ata_pci_device_suspend, 153 .resume = ata_pci_device_resume, 154 #endif 155 }; 156 157 module_pci_driver(ns87410_pci_driver); 158 159 MODULE_AUTHOR("Alan Cox"); 160 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); 161 MODULE_LICENSE("GPL"); 162 MODULE_DEVICE_TABLE(pci, ns87410); 163 MODULE_VERSION(DRV_VERSION); 164