1 /* 2 * pata_ns87410.c - National Semiconductor 87410 PATA for new ATA layer 3 * (C) 2006 Red Hat Inc 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation; either version 2, or (at your option) 8 * any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; see the file COPYING. If not, write to 17 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 18 */ 19 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/pci.h> 23 #include <linux/init.h> 24 #include <linux/blkdev.h> 25 #include <linux/delay.h> 26 #include <scsi/scsi_host.h> 27 #include <linux/libata.h> 28 29 #define DRV_NAME "pata_ns87410" 30 #define DRV_VERSION "0.4.6" 31 32 /** 33 * ns87410_pre_reset - probe begin 34 * @link: ATA link 35 * @deadline: deadline jiffies for the operation 36 * 37 * Check enabled ports 38 */ 39 40 static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline) 41 { 42 struct ata_port *ap = link->ap; 43 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 44 static const struct pci_bits ns87410_enable_bits[] = { 45 { 0x43, 1, 0x08, 0x08 }, 46 { 0x47, 1, 0x08, 0x08 } 47 }; 48 49 if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) 50 return -ENOENT; 51 52 return ata_sff_prereset(link, deadline); 53 } 54 55 /** 56 * ns87410_set_piomode - set initial PIO mode data 57 * @ap: ATA interface 58 * @adev: ATA device 59 * 60 * Program timing data. This is kept per channel not per device, 61 * and only affects the data port. 62 */ 63 64 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev) 65 { 66 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 67 int port = 0x40 + 4 * ap->port_no; 68 u8 idetcr, idefr; 69 struct ata_timing at; 70 71 static const u8 activebits[15] = { 72 0, 1, 2, 3, 4, 73 5, 5, 6, 6, 6, 74 6, 7, 7, 7, 7 75 }; 76 77 static const u8 recoverbits[12] = { 78 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 79 }; 80 81 pci_read_config_byte(pdev, port + 3, &idefr); 82 83 if (ata_pio_need_iordy(adev)) 84 idefr |= 0x04; /* IORDY enable */ 85 else 86 idefr &= ~0x04; 87 88 if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) { 89 dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode); 90 return; 91 } 92 93 at.active = clamp_val(at.active, 2, 16) - 2; 94 at.setup = clamp_val(at.setup, 1, 4) - 1; 95 at.recover = clamp_val(at.recover, 1, 12) - 1; 96 97 idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active]; 98 99 pci_write_config_byte(pdev, port, idetcr); 100 pci_write_config_byte(pdev, port + 3, idefr); 101 /* We use ap->private_data as a pointer to the device currently 102 loaded for timing */ 103 ap->private_data = adev; 104 } 105 106 /** 107 * ns87410_qc_issue - command issue 108 * @qc: command pending 109 * 110 * Called when the libata layer is about to issue a command. We wrap 111 * this interface so that we can load the correct ATA timings if 112 * necessary. 113 */ 114 115 static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc) 116 { 117 struct ata_port *ap = qc->ap; 118 struct ata_device *adev = qc->dev; 119 120 /* If modes have been configured and the channel data is not loaded 121 then load it. We have to check if pio_mode is set as the core code 122 does not set adev->pio_mode to XFER_PIO_0 while probing as would be 123 logical */ 124 125 if (adev->pio_mode && adev != ap->private_data) 126 ns87410_set_piomode(ap, adev); 127 128 return ata_sff_qc_issue(qc); 129 } 130 131 static struct scsi_host_template ns87410_sht = { 132 ATA_PIO_SHT(DRV_NAME), 133 }; 134 135 static struct ata_port_operations ns87410_port_ops = { 136 .inherits = &ata_sff_port_ops, 137 .qc_issue = ns87410_qc_issue, 138 .cable_detect = ata_cable_40wire, 139 .set_piomode = ns87410_set_piomode, 140 .prereset = ns87410_pre_reset, 141 }; 142 143 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id) 144 { 145 static const struct ata_port_info info = { 146 .flags = ATA_FLAG_SLAVE_POSS, 147 .pio_mask = ATA_PIO3, 148 .port_ops = &ns87410_port_ops 149 }; 150 const struct ata_port_info *ppi[] = { &info, NULL }; 151 return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0); 152 } 153 154 static const struct pci_device_id ns87410[] = { 155 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, 156 157 { }, 158 }; 159 160 static struct pci_driver ns87410_pci_driver = { 161 .name = DRV_NAME, 162 .id_table = ns87410, 163 .probe = ns87410_init_one, 164 .remove = ata_pci_remove_one, 165 #ifdef CONFIG_PM 166 .suspend = ata_pci_device_suspend, 167 .resume = ata_pci_device_resume, 168 #endif 169 }; 170 171 static int __init ns87410_init(void) 172 { 173 return pci_register_driver(&ns87410_pci_driver); 174 } 175 176 static void __exit ns87410_exit(void) 177 { 178 pci_unregister_driver(&ns87410_pci_driver); 179 } 180 181 MODULE_AUTHOR("Alan Cox"); 182 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); 183 MODULE_LICENSE("GPL"); 184 MODULE_DEVICE_TABLE(pci, ns87410); 185 MODULE_VERSION(DRV_VERSION); 186 187 module_init(ns87410_init); 188 module_exit(ns87410_exit); 189