1 /* 2 * RZ1000/1001 driver based upon 3 * 4 * linux/drivers/ide/pci/rz1000.c Version 0.06 January 12, 2003 5 * Copyright (C) 1995-1998 Linus Torvalds & author (see below) 6 * Principal Author: mlord@pobox.com (Mark Lord) 7 * 8 * See linux/MAINTAINERS for address of current maintainer. 9 * 10 * This file provides support for disabling the buggy read-ahead 11 * mode of the RZ1000 IDE chipset, commonly used on Intel motherboards. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/pci.h> 17 #include <linux/init.h> 18 #include <linux/blkdev.h> 19 #include <linux/delay.h> 20 #include <scsi/scsi_host.h> 21 #include <linux/libata.h> 22 23 #define DRV_NAME "pata_rz1000" 24 #define DRV_VERSION "0.2.3" 25 26 27 /** 28 * rz1000_prereset - probe begin 29 * @ap: ATA port 30 * 31 * Set up cable type and use generics 32 */ 33 34 static int rz1000_prereset(struct ata_port *ap) 35 { 36 ap->cbl = ATA_CBL_PATA40; 37 return ata_std_prereset(ap); 38 } 39 40 /** 41 * rz1000_error_handler - probe reset 42 * @ap: ATA port 43 * 44 * Perform the ATA standard reset sequence 45 */ 46 47 static void rz1000_error_handler(struct ata_port *ap) 48 { 49 ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset); 50 } 51 52 /** 53 * rz1000_set_mode - mode setting function 54 * @ap: ATA interface 55 * @unused: returned device on set_mode failure 56 * 57 * Use a non standard set_mode function. We don't want to be tuned. We 58 * would prefer to be BIOS generic but for the fact our hardware is 59 * whacked out. 60 */ 61 62 static int rz1000_set_mode(struct ata_port *ap, struct ata_device **unused) 63 { 64 int i; 65 66 for (i = 0; i < ATA_MAX_DEVICES; i++) { 67 struct ata_device *dev = &ap->device[i]; 68 if (ata_dev_ready(dev)) { 69 /* We don't really care */ 70 dev->pio_mode = XFER_PIO_0; 71 dev->xfer_mode = XFER_PIO_0; 72 dev->xfer_shift = ATA_SHIFT_PIO; 73 dev->flags |= ATA_DFLAG_PIO; 74 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); 75 } 76 } 77 return 0; 78 } 79 80 81 static struct scsi_host_template rz1000_sht = { 82 .module = THIS_MODULE, 83 .name = DRV_NAME, 84 .ioctl = ata_scsi_ioctl, 85 .queuecommand = ata_scsi_queuecmd, 86 .can_queue = ATA_DEF_QUEUE, 87 .this_id = ATA_SHT_THIS_ID, 88 .sg_tablesize = LIBATA_MAX_PRD, 89 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 90 .emulated = ATA_SHT_EMULATED, 91 .use_clustering = ATA_SHT_USE_CLUSTERING, 92 .proc_name = DRV_NAME, 93 .dma_boundary = ATA_DMA_BOUNDARY, 94 .slave_configure = ata_scsi_slave_config, 95 .slave_destroy = ata_scsi_slave_destroy, 96 .bios_param = ata_std_bios_param, 97 #ifdef CONFIG_PM 98 .resume = ata_scsi_device_resume, 99 .suspend = ata_scsi_device_suspend, 100 #endif 101 }; 102 103 static struct ata_port_operations rz1000_port_ops = { 104 .set_mode = rz1000_set_mode, 105 106 .port_disable = ata_port_disable, 107 .tf_load = ata_tf_load, 108 .tf_read = ata_tf_read, 109 .check_status = ata_check_status, 110 .exec_command = ata_exec_command, 111 .dev_select = ata_std_dev_select, 112 113 .bmdma_setup = ata_bmdma_setup, 114 .bmdma_start = ata_bmdma_start, 115 .bmdma_stop = ata_bmdma_stop, 116 .bmdma_status = ata_bmdma_status, 117 118 .qc_prep = ata_qc_prep, 119 .qc_issue = ata_qc_issue_prot, 120 121 .data_xfer = ata_data_xfer, 122 123 .freeze = ata_bmdma_freeze, 124 .thaw = ata_bmdma_thaw, 125 .error_handler = rz1000_error_handler, 126 .post_internal_cmd = ata_bmdma_post_internal_cmd, 127 128 .irq_handler = ata_interrupt, 129 .irq_clear = ata_bmdma_irq_clear, 130 .irq_on = ata_irq_on, 131 .irq_ack = ata_irq_ack, 132 133 .port_start = ata_port_start, 134 }; 135 136 static int rz1000_fifo_disable(struct pci_dev *pdev) 137 { 138 u16 reg; 139 /* Be exceptionally paranoid as we must be sure to apply the fix */ 140 if (pci_read_config_word(pdev, 0x40, ®) != 0) 141 return -1; 142 reg &= 0xDFFF; 143 if (pci_write_config_word(pdev, 0x40, reg) != 0) 144 return -1; 145 printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); 146 return 0; 147 } 148 149 /** 150 * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services 151 * @pdev: PCI device to register 152 * @ent: Entry in rz1000_pci_tbl matching with @pdev 153 * 154 * Configure an RZ1000 interface. This doesn't require much special 155 * handling except that we *MUST* kill the chipset readahead or the 156 * user may experience data corruption. 157 */ 158 159 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 160 { 161 static int printed_version; 162 struct ata_port_info *port_info[2]; 163 static struct ata_port_info info = { 164 .sht = &rz1000_sht, 165 .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, 166 .pio_mask = 0x1f, 167 .port_ops = &rz1000_port_ops 168 }; 169 170 if (!printed_version++) 171 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); 172 173 if (rz1000_fifo_disable(pdev) == 0) { 174 port_info[0] = &info; 175 port_info[1] = &info; 176 return ata_pci_init_one(pdev, port_info, 2); 177 } 178 printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); 179 /* Not safe to use so skip */ 180 return -ENODEV; 181 } 182 183 #ifdef CONFIG_PM 184 static int rz1000_reinit_one(struct pci_dev *pdev) 185 { 186 /* If this fails on resume (which is a "cant happen" case), we 187 must stop as any progress risks data loss */ 188 if (rz1000_fifo_disable(pdev)) 189 panic("rz1000 fifo"); 190 return ata_pci_device_resume(pdev); 191 } 192 #endif 193 194 static const struct pci_device_id pata_rz1000[] = { 195 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, 196 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, 197 198 { }, 199 }; 200 201 static struct pci_driver rz1000_pci_driver = { 202 .name = DRV_NAME, 203 .id_table = pata_rz1000, 204 .probe = rz1000_init_one, 205 .remove = ata_pci_remove_one, 206 #ifdef CONFIG_PM 207 .suspend = ata_pci_device_suspend, 208 .resume = rz1000_reinit_one, 209 #endif 210 }; 211 212 static int __init rz1000_init(void) 213 { 214 return pci_register_driver(&rz1000_pci_driver); 215 } 216 217 static void __exit rz1000_exit(void) 218 { 219 pci_unregister_driver(&rz1000_pci_driver); 220 } 221 222 MODULE_AUTHOR("Alan Cox"); 223 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); 224 MODULE_LICENSE("GPL"); 225 MODULE_DEVICE_TABLE(pci, pata_rz1000); 226 MODULE_VERSION(DRV_VERSION); 227 228 module_init(rz1000_init); 229 module_exit(rz1000_exit); 230 231