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 "0.2.4" 25 26 27 /** 28 * rz1000_set_mode - mode setting function 29 * @link: ATA link 30 * @unused: returned device on set_mode failure 31 * 32 * Use a non standard set_mode function. We don't want to be tuned. We 33 * would prefer to be BIOS generic but for the fact our hardware is 34 * whacked out. 35 */ 36 37 static int rz1000_set_mode(struct ata_link *link, struct ata_device **unused) 38 { 39 struct ata_device *dev; 40 41 ata_link_for_each_dev(dev, link) { 42 if (ata_dev_enabled(dev)) { 43 /* We don't really care */ 44 dev->pio_mode = XFER_PIO_0; 45 dev->xfer_mode = XFER_PIO_0; 46 dev->xfer_shift = ATA_SHIFT_PIO; 47 dev->flags |= ATA_DFLAG_PIO; 48 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); 49 } 50 } 51 return 0; 52 } 53 54 55 static struct scsi_host_template rz1000_sht = { 56 .module = THIS_MODULE, 57 .name = DRV_NAME, 58 .ioctl = ata_scsi_ioctl, 59 .queuecommand = ata_scsi_queuecmd, 60 .can_queue = ATA_DEF_QUEUE, 61 .this_id = ATA_SHT_THIS_ID, 62 .sg_tablesize = LIBATA_MAX_PRD, 63 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 64 .emulated = ATA_SHT_EMULATED, 65 .use_clustering = ATA_SHT_USE_CLUSTERING, 66 .proc_name = DRV_NAME, 67 .dma_boundary = ATA_DMA_BOUNDARY, 68 .slave_configure = ata_scsi_slave_config, 69 .slave_destroy = ata_scsi_slave_destroy, 70 .bios_param = ata_std_bios_param, 71 }; 72 73 static struct ata_port_operations rz1000_port_ops = { 74 .set_mode = rz1000_set_mode, 75 76 .tf_load = ata_tf_load, 77 .tf_read = ata_tf_read, 78 .check_status = ata_check_status, 79 .exec_command = ata_exec_command, 80 .dev_select = ata_std_dev_select, 81 82 .qc_prep = ata_qc_prep, 83 .qc_issue = ata_qc_issue_prot, 84 85 .data_xfer = ata_data_xfer, 86 87 .freeze = ata_bmdma_freeze, 88 .thaw = ata_bmdma_thaw, 89 .error_handler = ata_bmdma_error_handler, 90 .post_internal_cmd = ata_bmdma_post_internal_cmd, 91 .cable_detect = ata_cable_40wire, 92 93 .irq_handler = ata_interrupt, 94 .irq_clear = ata_noop_irq_clear, 95 .irq_on = ata_irq_on, 96 97 .port_start = ata_sff_port_start, 98 }; 99 100 static int rz1000_fifo_disable(struct pci_dev *pdev) 101 { 102 u16 reg; 103 /* Be exceptionally paranoid as we must be sure to apply the fix */ 104 if (pci_read_config_word(pdev, 0x40, ®) != 0) 105 return -1; 106 reg &= 0xDFFF; 107 if (pci_write_config_word(pdev, 0x40, reg) != 0) 108 return -1; 109 printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); 110 return 0; 111 } 112 113 /** 114 * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services 115 * @pdev: PCI device to register 116 * @ent: Entry in rz1000_pci_tbl matching with @pdev 117 * 118 * Configure an RZ1000 interface. This doesn't require much special 119 * handling except that we *MUST* kill the chipset readahead or the 120 * user may experience data corruption. 121 */ 122 123 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 124 { 125 static int printed_version; 126 static const struct ata_port_info info = { 127 .sht = &rz1000_sht, 128 .flags = ATA_FLAG_SLAVE_POSS, 129 .pio_mask = 0x1f, 130 .port_ops = &rz1000_port_ops 131 }; 132 const struct ata_port_info *ppi[] = { &info, NULL }; 133 134 if (!printed_version++) 135 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); 136 137 if (rz1000_fifo_disable(pdev) == 0) 138 return ata_pci_init_one(pdev, ppi); 139 140 printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); 141 /* Not safe to use so skip */ 142 return -ENODEV; 143 } 144 145 #ifdef CONFIG_PM 146 static int rz1000_reinit_one(struct pci_dev *pdev) 147 { 148 /* If this fails on resume (which is a "cant happen" case), we 149 must stop as any progress risks data loss */ 150 if (rz1000_fifo_disable(pdev)) 151 panic("rz1000 fifo"); 152 return ata_pci_device_resume(pdev); 153 } 154 #endif 155 156 static const struct pci_device_id pata_rz1000[] = { 157 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, 158 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, 159 160 { }, 161 }; 162 163 static struct pci_driver rz1000_pci_driver = { 164 .name = DRV_NAME, 165 .id_table = pata_rz1000, 166 .probe = rz1000_init_one, 167 .remove = ata_pci_remove_one, 168 #ifdef CONFIG_PM 169 .suspend = ata_pci_device_suspend, 170 .resume = rz1000_reinit_one, 171 #endif 172 }; 173 174 static int __init rz1000_init(void) 175 { 176 return pci_register_driver(&rz1000_pci_driver); 177 } 178 179 static void __exit rz1000_exit(void) 180 { 181 pci_unregister_driver(&rz1000_pci_driver); 182 } 183 184 MODULE_AUTHOR("Alan Cox"); 185 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); 186 MODULE_LICENSE("GPL"); 187 MODULE_DEVICE_TABLE(pci, pata_rz1000); 188 MODULE_VERSION(DRV_VERSION); 189 190 module_init(rz1000_init); 191 module_exit(rz1000_exit); 192 193