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 * @ap: ATA interface 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_port *ap, struct ata_device **unused) 38 { 39 int i; 40 41 for (i = 0; i < ATA_MAX_DEVICES; i++) { 42 struct ata_device *dev = &ap->device[i]; 43 if (ata_dev_enabled(dev)) { 44 /* We don't really care */ 45 dev->pio_mode = XFER_PIO_0; 46 dev->xfer_mode = XFER_PIO_0; 47 dev->xfer_shift = ATA_SHIFT_PIO; 48 dev->flags |= ATA_DFLAG_PIO; 49 ata_dev_printk(dev, KERN_INFO, "configured for PIO\n"); 50 } 51 } 52 return 0; 53 } 54 55 56 static struct scsi_host_template rz1000_sht = { 57 .module = THIS_MODULE, 58 .name = DRV_NAME, 59 .ioctl = ata_scsi_ioctl, 60 .queuecommand = ata_scsi_queuecmd, 61 .can_queue = ATA_DEF_QUEUE, 62 .this_id = ATA_SHT_THIS_ID, 63 .sg_tablesize = LIBATA_MAX_PRD, 64 .cmd_per_lun = ATA_SHT_CMD_PER_LUN, 65 .emulated = ATA_SHT_EMULATED, 66 .use_clustering = ATA_SHT_USE_CLUSTERING, 67 .proc_name = DRV_NAME, 68 .dma_boundary = ATA_DMA_BOUNDARY, 69 .slave_configure = ata_scsi_slave_config, 70 .slave_destroy = ata_scsi_slave_destroy, 71 .bios_param = ata_std_bios_param, 72 }; 73 74 static struct ata_port_operations rz1000_port_ops = { 75 .set_mode = rz1000_set_mode, 76 77 .port_disable = ata_port_disable, 78 .tf_load = ata_tf_load, 79 .tf_read = ata_tf_read, 80 .check_status = ata_check_status, 81 .exec_command = ata_exec_command, 82 .dev_select = ata_std_dev_select, 83 84 .bmdma_setup = ata_bmdma_setup, 85 .bmdma_start = ata_bmdma_start, 86 .bmdma_stop = ata_bmdma_stop, 87 .bmdma_status = ata_bmdma_status, 88 89 .qc_prep = ata_qc_prep, 90 .qc_issue = ata_qc_issue_prot, 91 92 .data_xfer = ata_data_xfer, 93 94 .freeze = ata_bmdma_freeze, 95 .thaw = ata_bmdma_thaw, 96 .error_handler = ata_bmdma_error_handler, 97 .post_internal_cmd = ata_bmdma_post_internal_cmd, 98 .cable_detect = ata_cable_40wire, 99 100 .irq_handler = ata_interrupt, 101 .irq_clear = ata_bmdma_irq_clear, 102 .irq_on = ata_irq_on, 103 .irq_ack = ata_irq_ack, 104 105 .port_start = ata_port_start, 106 }; 107 108 static int rz1000_fifo_disable(struct pci_dev *pdev) 109 { 110 u16 reg; 111 /* Be exceptionally paranoid as we must be sure to apply the fix */ 112 if (pci_read_config_word(pdev, 0x40, ®) != 0) 113 return -1; 114 reg &= 0xDFFF; 115 if (pci_write_config_word(pdev, 0x40, reg) != 0) 116 return -1; 117 printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n"); 118 return 0; 119 } 120 121 /** 122 * rz1000_init_one - Register RZ1000 ATA PCI device with kernel services 123 * @pdev: PCI device to register 124 * @ent: Entry in rz1000_pci_tbl matching with @pdev 125 * 126 * Configure an RZ1000 interface. This doesn't require much special 127 * handling except that we *MUST* kill the chipset readahead or the 128 * user may experience data corruption. 129 */ 130 131 static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) 132 { 133 static int printed_version; 134 static const struct ata_port_info info = { 135 .sht = &rz1000_sht, 136 .flags = ATA_FLAG_SLAVE_POSS, 137 .pio_mask = 0x1f, 138 .port_ops = &rz1000_port_ops 139 }; 140 const struct ata_port_info *ppi[] = { &info, NULL }; 141 142 if (!printed_version++) 143 printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n"); 144 145 if (rz1000_fifo_disable(pdev) == 0) 146 return ata_pci_init_one(pdev, ppi); 147 148 printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n"); 149 /* Not safe to use so skip */ 150 return -ENODEV; 151 } 152 153 #ifdef CONFIG_PM 154 static int rz1000_reinit_one(struct pci_dev *pdev) 155 { 156 /* If this fails on resume (which is a "cant happen" case), we 157 must stop as any progress risks data loss */ 158 if (rz1000_fifo_disable(pdev)) 159 panic("rz1000 fifo"); 160 return ata_pci_device_resume(pdev); 161 } 162 #endif 163 164 static const struct pci_device_id pata_rz1000[] = { 165 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), }, 166 { PCI_VDEVICE(PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), }, 167 168 { }, 169 }; 170 171 static struct pci_driver rz1000_pci_driver = { 172 .name = DRV_NAME, 173 .id_table = pata_rz1000, 174 .probe = rz1000_init_one, 175 .remove = ata_pci_remove_one, 176 #ifdef CONFIG_PM 177 .suspend = ata_pci_device_suspend, 178 .resume = rz1000_reinit_one, 179 #endif 180 }; 181 182 static int __init rz1000_init(void) 183 { 184 return pci_register_driver(&rz1000_pci_driver); 185 } 186 187 static void __exit rz1000_exit(void) 188 { 189 pci_unregister_driver(&rz1000_pci_driver); 190 } 191 192 MODULE_AUTHOR("Alan Cox"); 193 MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA"); 194 MODULE_LICENSE("GPL"); 195 MODULE_DEVICE_TABLE(pci, pata_rz1000); 196 MODULE_VERSION(DRV_VERSION); 197 198 module_init(rz1000_init); 199 module_exit(rz1000_exit); 200 201