1 /* 2 * pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer 3 * (C) 2006 Red Hat Inc 4 * Alan Cox <alan@redhat.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2, or (at your option) 9 * any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; see the file COPYING. If not, write to 18 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 19 */ 20 21 #include <linux/kernel.h> 22 #include <linux/module.h> 23 #include <linux/pci.h> 24 #include <linux/init.h> 25 #include <linux/blkdev.h> 26 #include <linux/delay.h> 27 #include <scsi/scsi_host.h> 28 #include <linux/libata.h> 29 30 #define DRV_NAME "pata_ns87410" 31 #define DRV_VERSION "0.4.6" 32 33 /** 34 * ns87410_pre_reset - probe begin 35 * @link: ATA link 36 * @deadline: deadline jiffies for the operation 37 * 38 * Check enabled ports 39 */ 40 41 static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline) 42 { 43 struct ata_port *ap = link->ap; 44 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 45 static const struct pci_bits ns87410_enable_bits[] = { 46 { 0x43, 1, 0x08, 0x08 }, 47 { 0x47, 1, 0x08, 0x08 } 48 }; 49 50 if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) 51 return -ENOENT; 52 53 return ata_sff_prereset(link, deadline); 54 } 55 56 /** 57 * ns87410_set_piomode - set initial PIO mode data 58 * @ap: ATA interface 59 * @adev: ATA device 60 * 61 * Program timing data. This is kept per channel not per device, 62 * and only affects the data port. 63 */ 64 65 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev) 66 { 67 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 68 int port = 0x40 + 4 * ap->port_no; 69 u8 idetcr, idefr; 70 struct ata_timing at; 71 72 static const u8 activebits[15] = { 73 0, 1, 2, 3, 4, 74 5, 5, 6, 6, 6, 75 6, 7, 7, 7, 7 76 }; 77 78 static const u8 recoverbits[12] = { 79 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 80 }; 81 82 pci_read_config_byte(pdev, port + 3, &idefr); 83 84 if (ata_pio_need_iordy(adev)) 85 idefr |= 0x04; /* IORDY enable */ 86 else 87 idefr &= ~0x04; 88 89 if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) { 90 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode); 91 return; 92 } 93 94 at.active = clamp_val(at.active, 2, 16) - 2; 95 at.setup = clamp_val(at.setup, 1, 4) - 1; 96 at.recover = clamp_val(at.recover, 1, 12) - 1; 97 98 idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active]; 99 100 pci_write_config_byte(pdev, port, idetcr); 101 pci_write_config_byte(pdev, port + 3, idefr); 102 /* We use ap->private_data as a pointer to the device currently 103 loaded for timing */ 104 ap->private_data = adev; 105 } 106 107 /** 108 * ns87410_qc_issue - command issue 109 * @qc: command pending 110 * 111 * Called when the libata layer is about to issue a command. We wrap 112 * this interface so that we can load the correct ATA timings if 113 * necessary. 114 */ 115 116 static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc) 117 { 118 struct ata_port *ap = qc->ap; 119 struct ata_device *adev = qc->dev; 120 121 /* If modes have been configured and the channel data is not loaded 122 then load it. We have to check if pio_mode is set as the core code 123 does not set adev->pio_mode to XFER_PIO_0 while probing as would be 124 logical */ 125 126 if (adev->pio_mode && adev != ap->private_data) 127 ns87410_set_piomode(ap, adev); 128 129 return ata_sff_qc_issue(qc); 130 } 131 132 static struct scsi_host_template ns87410_sht = { 133 ATA_PIO_SHT(DRV_NAME), 134 }; 135 136 static struct ata_port_operations ns87410_port_ops = { 137 .inherits = &ata_sff_port_ops, 138 .qc_issue = ns87410_qc_issue, 139 .cable_detect = ata_cable_40wire, 140 .set_piomode = ns87410_set_piomode, 141 .prereset = ns87410_pre_reset, 142 }; 143 144 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id) 145 { 146 static const struct ata_port_info info = { 147 .flags = ATA_FLAG_SLAVE_POSS, 148 .pio_mask = 0x0F, 149 .port_ops = &ns87410_port_ops 150 }; 151 const struct ata_port_info *ppi[] = { &info, NULL }; 152 return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL); 153 } 154 155 static const struct pci_device_id ns87410[] = { 156 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, 157 158 { }, 159 }; 160 161 static struct pci_driver ns87410_pci_driver = { 162 .name = DRV_NAME, 163 .id_table = ns87410, 164 .probe = ns87410_init_one, 165 .remove = ata_pci_remove_one, 166 #ifdef CONFIG_PM 167 .suspend = ata_pci_device_suspend, 168 .resume = ata_pci_device_resume, 169 #endif 170 }; 171 172 static int __init ns87410_init(void) 173 { 174 return pci_register_driver(&ns87410_pci_driver); 175 } 176 177 static void __exit ns87410_exit(void) 178 { 179 pci_unregister_driver(&ns87410_pci_driver); 180 } 181 182 MODULE_AUTHOR("Alan Cox"); 183 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); 184 MODULE_LICENSE("GPL"); 185 MODULE_DEVICE_TABLE(pci, ns87410); 186 MODULE_VERSION(DRV_VERSION); 187 188 module_init(ns87410_init); 189 module_exit(ns87410_exit); 190