1 /* 2 * pata_opti.c - ATI PATA for new ATA layer 3 * (C) 2005 Red Hat Inc 4 * Alan Cox <alan@redhat.com> 5 * 6 * Based on 7 * linux/drivers/ide/pci/opti621.c Version 0.7 Sept 10, 2002 8 * 9 * Copyright (C) 1996-1998 Linus Torvalds & authors (see below) 10 * 11 * Authors: 12 * Jaromir Koutek <miri@punknet.cz>, 13 * Jan Harkes <jaharkes@cwi.nl>, 14 * Mark Lord <mlord@pobox.com> 15 * Some parts of code are from ali14xx.c and from rz1000.c. 16 * 17 * Also consulted the FreeBSD prototype driver by Kevin Day to try 18 * and resolve some confusions. Further documentation can be found in 19 * Ralf Brown's interrupt list 20 * 21 * If you have other variants of the Opti range (Viper/Vendetta) please 22 * try this driver with those PCI idents and report back. For the later 23 * chips see the pata_optidma driver 24 * 25 */ 26 27 #include <linux/kernel.h> 28 #include <linux/module.h> 29 #include <linux/pci.h> 30 #include <linux/init.h> 31 #include <linux/blkdev.h> 32 #include <linux/delay.h> 33 #include <scsi/scsi_host.h> 34 #include <linux/libata.h> 35 36 #define DRV_NAME "pata_opti" 37 #define DRV_VERSION "0.2.9" 38 39 enum { 40 READ_REG = 0, /* index of Read cycle timing register */ 41 WRITE_REG = 1, /* index of Write cycle timing register */ 42 CNTRL_REG = 3, /* index of Control register */ 43 STRAP_REG = 5, /* index of Strap register */ 44 MISC_REG = 6 /* index of Miscellaneous register */ 45 }; 46 47 /** 48 * opti_pre_reset - probe begin 49 * @link: ATA link 50 * @deadline: deadline jiffies for the operation 51 * 52 * Set up cable type and use generic probe init 53 */ 54 55 static int opti_pre_reset(struct ata_link *link, unsigned long deadline) 56 { 57 struct ata_port *ap = link->ap; 58 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 59 static const struct pci_bits opti_enable_bits[] = { 60 { 0x45, 1, 0x80, 0x00 }, 61 { 0x40, 1, 0x08, 0x00 } 62 }; 63 64 if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) 65 return -ENOENT; 66 67 return ata_sff_prereset(link, deadline); 68 } 69 70 /** 71 * opti_write_reg - control register setup 72 * @ap: ATA port 73 * @value: value 74 * @reg: control register number 75 * 76 * The Opti uses magic 'trapdoor' register accesses to do configuration 77 * rather than using PCI space as other controllers do. The double inw 78 * on the error register activates configuration mode. We can then write 79 * the control register 80 */ 81 82 static void opti_write_reg(struct ata_port *ap, u8 val, int reg) 83 { 84 void __iomem *regio = ap->ioaddr.cmd_addr; 85 86 /* These 3 unlock the control register access */ 87 ioread16(regio + 1); 88 ioread16(regio + 1); 89 iowrite8(3, regio + 2); 90 91 /* Do the I/O */ 92 iowrite8(val, regio + reg); 93 94 /* Relock */ 95 iowrite8(0x83, regio + 2); 96 } 97 98 /** 99 * opti_set_piomode - set initial PIO mode data 100 * @ap: ATA interface 101 * @adev: ATA device 102 * 103 * Called to do the PIO mode setup. Timing numbers are taken from 104 * the FreeBSD driver then pre computed to keep the code clean. There 105 * are two tables depending on the hardware clock speed. 106 */ 107 108 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev) 109 { 110 struct ata_device *pair = ata_dev_pair(adev); 111 int clock; 112 int pio = adev->pio_mode - XFER_PIO_0; 113 void __iomem *regio = ap->ioaddr.cmd_addr; 114 u8 addr; 115 116 /* Address table precomputed with prefetch off and a DCLK of 2 */ 117 static const u8 addr_timing[2][5] = { 118 { 0x30, 0x20, 0x20, 0x10, 0x10 }, 119 { 0x20, 0x20, 0x10, 0x10, 0x10 } 120 }; 121 static const u8 data_rec_timing[2][5] = { 122 { 0x6B, 0x56, 0x42, 0x32, 0x31 }, 123 { 0x58, 0x44, 0x32, 0x22, 0x21 } 124 }; 125 126 iowrite8(0xff, regio + 5); 127 clock = ioread16(regio + 5) & 1; 128 129 /* 130 * As with many controllers the address setup time is shared 131 * and must suit both devices if present. 132 */ 133 134 addr = addr_timing[clock][pio]; 135 if (pair) { 136 /* Hardware constraint */ 137 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0]; 138 if (pair_addr > addr) 139 addr = pair_addr; 140 } 141 142 /* Commence primary programming sequence */ 143 opti_write_reg(ap, adev->devno, MISC_REG); 144 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG); 145 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG); 146 opti_write_reg(ap, addr, MISC_REG); 147 148 /* Programming sequence complete, override strapping */ 149 opti_write_reg(ap, 0x85, CNTRL_REG); 150 } 151 152 static struct scsi_host_template opti_sht = { 153 ATA_PIO_SHT(DRV_NAME), 154 }; 155 156 static struct ata_port_operations opti_port_ops = { 157 .inherits = &ata_sff_port_ops, 158 .cable_detect = ata_cable_40wire, 159 .set_piomode = opti_set_piomode, 160 .prereset = opti_pre_reset, 161 }; 162 163 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) 164 { 165 static const struct ata_port_info info = { 166 .flags = ATA_FLAG_SLAVE_POSS, 167 .pio_mask = 0x1f, 168 .port_ops = &opti_port_ops 169 }; 170 const struct ata_port_info *ppi[] = { &info, NULL }; 171 static int printed_version; 172 173 if (!printed_version++) 174 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); 175 176 return ata_pci_sff_init_one(dev, ppi, &opti_sht, NULL); 177 } 178 179 static const struct pci_device_id opti[] = { 180 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, 181 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, 182 183 { }, 184 }; 185 186 static struct pci_driver opti_pci_driver = { 187 .name = DRV_NAME, 188 .id_table = opti, 189 .probe = opti_init_one, 190 .remove = ata_pci_remove_one, 191 #ifdef CONFIG_PM 192 .suspend = ata_pci_device_suspend, 193 .resume = ata_pci_device_resume, 194 #endif 195 }; 196 197 static int __init opti_init(void) 198 { 199 return pci_register_driver(&opti_pci_driver); 200 } 201 202 static void __exit opti_exit(void) 203 { 204 pci_unregister_driver(&opti_pci_driver); 205 } 206 207 208 MODULE_AUTHOR("Alan Cox"); 209 MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); 210 MODULE_LICENSE("GPL"); 211 MODULE_DEVICE_TABLE(pci, opti); 212 MODULE_VERSION(DRV_VERSION); 213 214 module_init(opti_init); 215 module_exit(opti_exit); 216