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 * @ap: ATA port 50 * 51 * Set up cable type and use generic probe init 52 */ 53 54 static 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 return ata_std_prereset(ap); 65 } 66 67 /** 68 * opti_probe_reset - probe reset 69 * @ap: ATA port 70 * 71 * Perform the ATA probe and bus reset sequence plus specific handling 72 * for this hardware. The Opti needs little handling - we have no UDMA66 73 * capability that needs cable detection. All we must do is check the port 74 * is enabled. 75 */ 76 77 static void opti_error_handler(struct ata_port *ap) 78 { 79 ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset); 80 } 81 82 /** 83 * opti_write_reg - control register setup 84 * @ap: ATA port 85 * @value: value 86 * @reg: control register number 87 * 88 * The Opti uses magic 'trapdoor' register accesses to do configuration 89 * rather than using PCI space as other controllers do. The double inw 90 * on the error register activates configuration mode. We can then write 91 * the control register 92 */ 93 94 static void opti_write_reg(struct ata_port *ap, u8 val, int reg) 95 { 96 void __iomem *regio = ap->ioaddr.cmd_addr; 97 98 /* These 3 unlock the control register access */ 99 ioread16(regio + 1); 100 ioread16(regio + 1); 101 iowrite8(3, regio + 2); 102 103 /* Do the I/O */ 104 iowrite8(val, regio + reg); 105 106 /* Relock */ 107 iowrite8(0x83, regio + 2); 108 } 109 110 /** 111 * opti_set_piomode - set initial PIO mode data 112 * @ap: ATA interface 113 * @adev: ATA device 114 * 115 * Called to do the PIO mode setup. Timing numbers are taken from 116 * the FreeBSD driver then pre computed to keep the code clean. There 117 * are two tables depending on the hardware clock speed. 118 */ 119 120 static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev) 121 { 122 struct ata_device *pair = ata_dev_pair(adev); 123 int clock; 124 int pio = adev->pio_mode - XFER_PIO_0; 125 void __iomem *regio = ap->ioaddr.cmd_addr; 126 u8 addr; 127 128 /* Address table precomputed with prefetch off and a DCLK of 2 */ 129 static const u8 addr_timing[2][5] = { 130 { 0x30, 0x20, 0x20, 0x10, 0x10 }, 131 { 0x20, 0x20, 0x10, 0x10, 0x10 } 132 }; 133 static const u8 data_rec_timing[2][5] = { 134 { 0x6B, 0x56, 0x42, 0x32, 0x31 }, 135 { 0x58, 0x44, 0x32, 0x22, 0x21 } 136 }; 137 138 iowrite8(0xff, regio + 5); 139 clock = ioread16(regio + 5) & 1; 140 141 /* 142 * As with many controllers the address setup time is shared 143 * and must suit both devices if present. 144 */ 145 146 addr = addr_timing[clock][pio]; 147 if (pair) { 148 /* Hardware constraint */ 149 u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0]; 150 if (pair_addr > addr) 151 addr = pair_addr; 152 } 153 154 /* Commence primary programming sequence */ 155 opti_write_reg(ap, adev->devno, MISC_REG); 156 opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG); 157 opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG); 158 opti_write_reg(ap, addr, MISC_REG); 159 160 /* Programming sequence complete, override strapping */ 161 opti_write_reg(ap, 0x85, CNTRL_REG); 162 } 163 164 static struct scsi_host_template opti_sht = { 165 .module = THIS_MODULE, 166 .name = DRV_NAME, 167 .ioctl = ata_scsi_ioctl, 168 .queuecommand = ata_scsi_queuecmd, 169 .can_queue = ATA_DEF_QUEUE, 170 .this_id = ATA_SHT_THIS_ID, 171 .sg_tablesize = LIBATA_MAX_PRD, 172 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 173 .emulated = ATA_SHT_EMULATED, 174 .use_clustering = ATA_SHT_USE_CLUSTERING, 175 .proc_name = DRV_NAME, 176 .dma_boundary = ATA_DMA_BOUNDARY, 177 .slave_configure = ata_scsi_slave_config, 178 .slave_destroy = ata_scsi_slave_destroy, 179 .bios_param = ata_std_bios_param, 180 #ifdef CONFIG_PM 181 .resume = ata_scsi_device_resume, 182 .suspend = ata_scsi_device_suspend, 183 #endif 184 }; 185 186 static 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 .cable_detect = ata_cable_40wire, 200 201 .bmdma_setup = ata_bmdma_setup, 202 .bmdma_start = ata_bmdma_start, 203 .bmdma_stop = ata_bmdma_stop, 204 .bmdma_status = ata_bmdma_status, 205 206 .qc_prep = ata_qc_prep, 207 .qc_issue = ata_qc_issue_prot, 208 209 .data_xfer = ata_data_xfer, 210 211 .irq_handler = ata_interrupt, 212 .irq_clear = ata_bmdma_irq_clear, 213 .irq_on = ata_irq_on, 214 .irq_ack = ata_irq_ack, 215 216 .port_start = ata_port_start, 217 }; 218 219 static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id) 220 { 221 static struct ata_port_info info = { 222 .sht = &opti_sht, 223 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 224 .pio_mask = 0x1f, 225 .port_ops = &opti_port_ops 226 }; 227 static struct ata_port_info *port_info[2] = { &info, &info }; 228 static int printed_version; 229 230 if (!printed_version++) 231 dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n"); 232 233 return ata_pci_init_one(dev, port_info, 2); 234 } 235 236 static const struct pci_device_id opti[] = { 237 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C621), 0 }, 238 { PCI_VDEVICE(OPTI, PCI_DEVICE_ID_OPTI_82C825), 1 }, 239 240 { }, 241 }; 242 243 static struct pci_driver opti_pci_driver = { 244 .name = DRV_NAME, 245 .id_table = opti, 246 .probe = opti_init_one, 247 .remove = ata_pci_remove_one, 248 #ifdef CONFIG_PM 249 .suspend = ata_pci_device_suspend, 250 .resume = ata_pci_device_resume, 251 #endif 252 }; 253 254 static int __init opti_init(void) 255 { 256 return pci_register_driver(&opti_pci_driver); 257 } 258 259 static void __exit opti_exit(void) 260 { 261 pci_unregister_driver(&opti_pci_driver); 262 } 263 264 265 MODULE_AUTHOR("Alan Cox"); 266 MODULE_DESCRIPTION("low-level driver for Opti 621/621X"); 267 MODULE_LICENSE("GPL"); 268 MODULE_DEVICE_TABLE(pci, opti); 269 MODULE_VERSION(DRV_VERSION); 270 271 module_init(opti_init); 272 module_exit(opti_exit); 273