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_std_prereset(link, deadline); 68 } 69 70 /** 71 * opti_probe_reset - probe reset 72 * @ap: ATA port 73 * 74 * Perform the ATA probe and bus reset sequence plus specific handling 75 * for this hardware. The Opti needs little handling - we have no UDMA66 76 * capability that needs cable detection. All we must do is check the port 77 * is enabled. 78 */ 79 80 static void opti_error_handler(struct ata_port *ap) 81 { 82 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset); 83 } 84 85 /** 86 * opti_write_reg - control register setup 87 * @ap: ATA port 88 * @value: value 89 * @reg: control register number 90 * 91 * The Opti uses magic 'trapdoor' register accesses to do configuration 92 * rather than using PCI space as other controllers do. The double inw 93 * on the error register activates configuration mode. We can then write 94 * the control register 95 */ 96 97 static void opti_write_reg(struct ata_port *ap, u8 val, int reg) 98 { 99 void __iomem *regio = ap->ioaddr.cmd_addr; 100 101 /* These 3 unlock the control register access */ 102 ioread16(regio + 1); 103 ioread16(regio + 1); 104 iowrite8(3, regio + 2); 105 106 /* Do the I/O */ 107 iowrite8(val, regio + reg); 108 109 /* Relock */ 110 iowrite8(0x83, regio + 2); 111 } 112 113 /** 114 * opti_set_piomode - set initial PIO mode data 115 * @ap: ATA interface 116 * @adev: ATA device 117 * 118 * Called to do the PIO mode setup. Timing numbers are taken from 119 * the FreeBSD driver then pre computed to keep the code clean. There 120 * are two tables depending on the hardware clock speed. 121 */ 122 123 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev) 124 { 125 struct ata_device *pair = ata_dev_pair(adev); 126 int clock; 127 int pio = adev->pio_mode - XFER_PIO_0; 128 void __iomem *regio = ap->ioaddr.cmd_addr; 129 u8 addr; 130 131 /* Address table precomputed with prefetch off and a DCLK of 2 */ 132 static const u8 addr_timing[2][5] = { 133 { 0x30, 0x20, 0x20, 0x10, 0x10 }, 134 { 0x20, 0x20, 0x10, 0x10, 0x10 } 135 }; 136 static const u8 data_rec_timing[2][5] = { 137 { 0x6B, 0x56, 0x42, 0x32, 0x31 }, 138 { 0x58, 0x44, 0x32, 0x22, 0x21 } 139 }; 140 141 iowrite8(0xff, regio + 5); 142 clock = ioread16(regio + 5) & 1; 143 144 /* 145 * As with many controllers the address setup time is shared 146 * and must suit both devices if present. 147 */ 148 149 addr = addr_timing[clock][pio]; 150 if (pair) { 151 /* Hardware constraint */ 152 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0]; 153 if (pair_addr > addr) 154 addr = pair_addr; 155 } 156 157 /* Commence primary programming sequence */ 158 opti_write_reg(ap, adev->devno, MISC_REG); 159 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG); 160 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG); 161 opti_write_reg(ap, addr, MISC_REG); 162 163 /* Programming sequence complete, override strapping */ 164 opti_write_reg(ap, 0x85, CNTRL_REG); 165 } 166 167 static struct scsi_host_template opti_sht = { 168 .module = THIS_MODULE, 169 .name = DRV_NAME, 170 .ioctl = ata_scsi_ioctl, 171 .queuecommand = ata_scsi_queuecmd, 172 .can_queue = ATA_DEF_QUEUE, 173 .this_id = ATA_SHT_THIS_ID, 174 .sg_tablesize = LIBATA_MAX_PRD, 175 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 176 .emulated = ATA_SHT_EMULATED, 177 .use_clustering = ATA_SHT_USE_CLUSTERING, 178 .proc_name = DRV_NAME, 179 .dma_boundary = ATA_DMA_BOUNDARY, 180 .slave_configure = ata_scsi_slave_config, 181 .slave_destroy = ata_scsi_slave_destroy, 182 .bios_param = ata_std_bios_param, 183 }; 184 185 static struct ata_port_operations opti_port_ops = { 186 .set_piomode = opti_set_piomode, 187 .tf_load = ata_tf_load, 188 .tf_read = ata_tf_read, 189 .check_status = ata_check_status, 190 .exec_command = ata_exec_command, 191 .dev_select = ata_std_dev_select, 192 193 .freeze = ata_bmdma_freeze, 194 .thaw = ata_bmdma_thaw, 195 .error_handler = opti_error_handler, 196 .post_internal_cmd = ata_bmdma_post_internal_cmd, 197 .cable_detect = ata_cable_40wire, 198 199 .bmdma_setup = ata_bmdma_setup, 200 .bmdma_start = ata_bmdma_start, 201 .bmdma_stop = ata_bmdma_stop, 202 .bmdma_status = ata_bmdma_status, 203 204 .qc_prep = ata_qc_prep, 205 .qc_issue = ata_qc_issue_prot, 206 207 .data_xfer = ata_data_xfer, 208 209 .irq_handler = ata_interrupt, 210 .irq_clear = ata_bmdma_irq_clear, 211 .irq_on = ata_irq_on, 212 213 .port_start = ata_sff_port_start, 214 }; 215 216 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) 217 { 218 static const struct ata_port_info info = { 219 .sht = &opti_sht, 220 .flags = ATA_FLAG_SLAVE_POSS, 221 .pio_mask = 0x1f, 222 .port_ops = &opti_port_ops 223 }; 224 const struct ata_port_info *ppi[] = { &info, NULL }; 225 static int printed_version; 226 227 if (!printed_version++) 228 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); 229 230 return ata_pci_init_one(dev, ppi); 231 } 232 233 static const struct pci_device_id opti[] = { 234 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, 235 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, 236 237 { }, 238 }; 239 240 static struct pci_driver opti_pci_driver = { 241 .name = DRV_NAME, 242 .id_table = opti, 243 .probe = opti_init_one, 244 .remove = ata_pci_remove_one, 245 #ifdef CONFIG_PM 246 .suspend = ata_pci_device_suspend, 247 .resume = ata_pci_device_resume, 248 #endif 249 }; 250 251 static int __init opti_init(void) 252 { 253 return pci_register_driver(&opti_pci_driver); 254 } 255 256 static void __exit opti_exit(void) 257 { 258 pci_unregister_driver(&opti_pci_driver); 259 } 260 261 262 MODULE_AUTHOR("Alan Cox"); 263 MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); 264 MODULE_LICENSE("GPL"); 265 MODULE_DEVICE_TABLE(pci, opti); 266 MODULE_VERSION(DRV_VERSION); 267 268 module_init(opti_init); 269 module_exit(opti_exit); 270