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/blkdev.h> 24 #include <linux/delay.h> 25 #include <scsi/scsi_host.h> 26 #include <linux/libata.h> 27 28 #define DRV_NAME "pata_ns87410" 29 #define DRV_VERSION "0.4.6" 30 31 /** 32 * ns87410_pre_reset - probe begin 33 * @link: ATA link 34 * @deadline: deadline jiffies for the operation 35 * 36 * Check enabled ports 37 */ 38 39 static int ns87410_pre_reset(struct ata_link *link, unsigned long deadline) 40 { 41 struct ata_port *ap = link->ap; 42 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 43 static const struct pci_bits ns87410_enable_bits[] = { 44 { 0x43, 1, 0x08, 0x08 }, 45 { 0x47, 1, 0x08, 0x08 } 46 }; 47 48 if (!pci_test_config_bits(pdev, &ns87410_enable_bits[ap->port_no])) 49 return -ENOENT; 50 51 return ata_sff_prereset(link, deadline); 52 } 53 54 /** 55 * ns87410_set_piomode - set initial PIO mode data 56 * @ap: ATA interface 57 * @adev: ATA device 58 * 59 * Program timing data. This is kept per channel not per device, 60 * and only affects the data port. 61 */ 62 63 static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev) 64 { 65 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 66 int port = 0x40 + 4 * ap->port_no; 67 u8 idetcr, idefr; 68 struct ata_timing at; 69 70 static const u8 activebits[15] = { 71 0, 1, 2, 3, 4, 72 5, 5, 6, 6, 6, 73 6, 7, 7, 7, 7 74 }; 75 76 static const u8 recoverbits[12] = { 77 0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7 78 }; 79 80 pci_read_config_byte(pdev, port + 3, &idefr); 81 82 if (ata_pio_need_iordy(adev)) 83 idefr |= 0x04; /* IORDY enable */ 84 else 85 idefr &= ~0x04; 86 87 if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) { 88 dev_err(&pdev->dev, "unknown mode %d\n", adev->pio_mode); 89 return; 90 } 91 92 at.active = clamp_val(at.active, 2, 16) - 2; 93 at.setup = clamp_val(at.setup, 1, 4) - 1; 94 at.recover = clamp_val(at.recover, 1, 12) - 1; 95 96 idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active]; 97 98 pci_write_config_byte(pdev, port, idetcr); 99 pci_write_config_byte(pdev, port + 3, idefr); 100 /* We use ap->private_data as a pointer to the device currently 101 loaded for timing */ 102 ap->private_data = adev; 103 } 104 105 /** 106 * ns87410_qc_issue - command issue 107 * @qc: command pending 108 * 109 * Called when the libata layer is about to issue a command. We wrap 110 * this interface so that we can load the correct ATA timings if 111 * necessary. 112 */ 113 114 static unsigned int ns87410_qc_issue(struct ata_queued_cmd *qc) 115 { 116 struct ata_port *ap = qc->ap; 117 struct ata_device *adev = qc->dev; 118 119 /* If modes have been configured and the channel data is not loaded 120 then load it. We have to check if pio_mode is set as the core code 121 does not set adev->pio_mode to XFER_PIO_0 while probing as would be 122 logical */ 123 124 if (adev->pio_mode && adev != ap->private_data) 125 ns87410_set_piomode(ap, adev); 126 127 return ata_sff_qc_issue(qc); 128 } 129 130 static struct scsi_host_template ns87410_sht = { 131 ATA_PIO_SHT(DRV_NAME), 132 }; 133 134 static struct ata_port_operations ns87410_port_ops = { 135 .inherits = &ata_sff_port_ops, 136 .qc_issue = ns87410_qc_issue, 137 .cable_detect = ata_cable_40wire, 138 .set_piomode = ns87410_set_piomode, 139 .prereset = ns87410_pre_reset, 140 }; 141 142 static int ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id) 143 { 144 static const struct ata_port_info info = { 145 .flags = ATA_FLAG_SLAVE_POSS, 146 .pio_mask = ATA_PIO3, 147 .port_ops = &ns87410_port_ops 148 }; 149 const struct ata_port_info *ppi[] = { &info, NULL }; 150 return ata_pci_sff_init_one(dev, ppi, &ns87410_sht, NULL, 0); 151 } 152 153 static const struct pci_device_id ns87410[] = { 154 { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87410), }, 155 156 { }, 157 }; 158 159 static struct pci_driver ns87410_pci_driver = { 160 .name = DRV_NAME, 161 .id_table = ns87410, 162 .probe = ns87410_init_one, 163 .remove = ata_pci_remove_one, 164 #ifdef CONFIG_PM_SLEEP 165 .suspend = ata_pci_device_suspend, 166 .resume = ata_pci_device_resume, 167 #endif 168 }; 169 170 module_pci_driver(ns87410_pci_driver); 171 172 MODULE_AUTHOR("Alan Cox"); 173 MODULE_DESCRIPTION("low-level driver for Nat Semi 87410"); 174 MODULE_LICENSE("GPL"); 175 MODULE_DEVICE_TABLE(pci, ns87410); 176 MODULE_VERSION(DRV_VERSION); 177