pata_opti.c revision 2eab80ac0c96fb98267afeb12a4899801564c75b
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 "0.2.7" 38 39enum { 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 * @ap: ATA port 50 * 51 * Set up cable type and use generic probe init 52 */ 53 54static int opti_pre_reset(struct ata_port *ap) 55{ 56 struct pci_dev *pdev = to_pci_dev(ap->host->dev); 57 static const struct pci_bits opti_enable_bits[] = { 58 { 0x45, 1, 0x80, 0x00 }, 59 { 0x40, 1, 0x08, 0x00 } 60 }; 61 62 if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) 63 return -ENOENT; 64 65 ap->cbl = ATA_CBL_PATA40; 66 return ata_std_prereset(ap); 67} 68 69/** 70 * opti_probe_reset - probe reset 71 * @ap: ATA port 72 * 73 * Perform the ATA probe and bus reset sequence plus specific handling 74 * for this hardware. The Opti needs little handling - we have no UDMA66 75 * capability that needs cable detection. All we must do is check the port 76 * is enabled. 77 */ 78 79static void opti_error_handler(struct ata_port *ap) 80{ 81 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset); 82} 83 84/** 85 * opti_write_reg - control register setup 86 * @ap: ATA port 87 * @value: value 88 * @reg: control register number 89 * 90 * The Opti uses magic 'trapdoor' register accesses to do configuration 91 * rather than using PCI space as other controllers do. The double inw 92 * on the error register activates configuration mode. We can then write 93 * the control register 94 */ 95 96static void opti_write_reg(struct ata_port *ap, u8 val, int reg) 97{ 98 unsigned long regio = ap->ioaddr.cmd_addr; 99 100 /* These 3 unlock the control register access */ 101 inw(regio + 1); 102 inw(regio + 1); 103 outb(3, regio + 2); 104 105 /* Do the I/O */ 106 outb(val, regio + reg); 107 108 /* Relock */ 109 outb(0x83, regio + 2); 110} 111 112/** 113 * opti_set_piomode - set initial PIO mode data 114 * @ap: ATA interface 115 * @adev: ATA device 116 * 117 * Called to do the PIO mode setup. Timing numbers are taken from 118 * the FreeBSD driver then pre computed to keep the code clean. There 119 * are two tables depending on the hardware clock speed. 120 */ 121 122static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev) 123{ 124 struct ata_device *pair = ata_dev_pair(adev); 125 int clock; 126 int pio = adev->pio_mode - XFER_PIO_0; 127 unsigned long regio = ap->ioaddr.cmd_addr; 128 u8 addr; 129 130 /* Address table precomputed with prefetch off and a DCLK of 2 */ 131 static const u8 addr_timing[2][5] = { 132 { 0x30, 0x20, 0x20, 0x10, 0x10 }, 133 { 0x20, 0x20, 0x10, 0x10, 0x10 } 134 }; 135 static const u8 data_rec_timing[2][5] = { 136 { 0x6B, 0x56, 0x42, 0x32, 0x31 }, 137 { 0x58, 0x44, 0x32, 0x22, 0x21 } 138 }; 139 140 outb(0xff, regio + 5); 141 clock = inw(regio + 5) & 1; 142 143 /* 144 * As with many controllers the address setup time is shared 145 * and must suit both devices if present. 146 */ 147 148 addr = addr_timing[clock][pio]; 149 if (pair) { 150 /* Hardware constraint */ 151 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0]; 152 if (pair_addr > addr) 153 addr = pair_addr; 154 } 155 156 /* Commence primary programming sequence */ 157 opti_write_reg(ap, adev->devno, MISC_REG); 158 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG); 159 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG); 160 opti_write_reg(ap, addr, MISC_REG); 161 162 /* Programming sequence complete, override strapping */ 163 opti_write_reg(ap, 0x85, CNTRL_REG); 164} 165 166static struct scsi_host_template opti_sht = { 167 .module = THIS_MODULE, 168 .name = DRV_NAME, 169 .ioctl = ata_scsi_ioctl, 170 .queuecommand = ata_scsi_queuecmd, 171 .can_queue = ATA_DEF_QUEUE, 172 .this_id = ATA_SHT_THIS_ID, 173 .sg_tablesize = LIBATA_MAX_PRD, 174 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 175 .emulated = ATA_SHT_EMULATED, 176 .use_clustering = ATA_SHT_USE_CLUSTERING, 177 .proc_name = DRV_NAME, 178 .dma_boundary = ATA_DMA_BOUNDARY, 179 .slave_configure = ata_scsi_slave_config, 180 .slave_destroy = ata_scsi_slave_destroy, 181 .bios_param = ata_std_bios_param, 182 .resume = ata_scsi_device_resume, 183 .suspend = ata_scsi_device_suspend, 184}; 185 186static struct ata_port_operations opti_port_ops = { 187 .port_disable = ata_port_disable, 188 .set_piomode = opti_set_piomode, 189 .tf_load = ata_tf_load, 190 .tf_read = ata_tf_read, 191 .check_status = ata_check_status, 192 .exec_command = ata_exec_command, 193 .dev_select = ata_std_dev_select, 194 195 .freeze = ata_bmdma_freeze, 196 .thaw = ata_bmdma_thaw, 197 .error_handler = opti_error_handler, 198 .post_internal_cmd = ata_bmdma_post_internal_cmd, 199 200 .bmdma_setup = ata_bmdma_setup, 201 .bmdma_start = ata_bmdma_start, 202 .bmdma_stop = ata_bmdma_stop, 203 .bmdma_status = ata_bmdma_status, 204 205 .qc_prep = ata_qc_prep, 206 .qc_issue = ata_qc_issue_prot, 207 208 .data_xfer = ata_pio_data_xfer, 209 210 .irq_handler = ata_interrupt, 211 .irq_clear = ata_bmdma_irq_clear, 212 213 .port_start = ata_port_start, 214 .port_stop = ata_port_stop, 215 .host_stop = ata_host_stop 216}; 217 218static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) 219{ 220 static struct ata_port_info info = { 221 .sht = &opti_sht, 222 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 223 .pio_mask = 0x1f, 224 .port_ops = &opti_port_ops 225 }; 226 static struct ata_port_info *port_info[2] = { &info, &info }; 227 static int printed_version; 228 229 if (!printed_version++) 230 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); 231 232 return ata_pci_init_one(dev, port_info, 2); 233} 234 235static const struct pci_device_id opti[] = { 236 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, 237 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, 238 239 { }, 240}; 241 242static struct pci_driver opti_pci_driver = { 243 .name = DRV_NAME, 244 .id_table = opti, 245 .probe = opti_init_one, 246 .remove = ata_pci_remove_one, 247 .suspend = ata_pci_device_suspend, 248 .resume = ata_pci_device_resume, 249}; 250 251static int __init opti_init(void) 252{ 253 return pci_register_driver(&opti_pci_driver); 254} 255 256static void __exit opti_exit(void) 257{ 258 pci_unregister_driver(&opti_pci_driver); 259} 260 261 262MODULE_AUTHOR("Alan Cox"); 263MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); 264MODULE_LICENSE("GPL"); 265MODULE_DEVICE_TABLE(pci, opti); 266MODULE_VERSION(DRV_VERSION); 267 268module_init(opti_init); 269module_exit(opti_exit); 270