| 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_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); |