/* * pata_radisys.c - Intel PATA/SATA controllers * * (C) 2006 Red Hat <alan@redhat.com> * * Some parts based on ata_piix.c by Jeff Garzik and others. * * A PIIX relative, this device has a single ATA channel and no * slave timings, SITRE or PPE. In that sense it is a close relative * of the original PIIX. It does however support UDMA 33/66 per channel * although no other modes/timings. Also lacking is 32bit I/O on the ATA * port. */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/blkdev.h> #include <linux/delay.h> #include <linux/device.h> #include <scsi/scsi_host.h> #include <linux/libata.h> #include <linux/ata.h> #define DRV_NAME "pata_radisys" #define DRV_VERSION "0.4.1" /** * radisys_probe_init - probe begin * @ap: ATA port * * Set up cable type and use generic probe init */ static int radisys_pre_reset(struct ata_port *ap) { ap->cbl = ATA_CBL_PATA80; return ata_std_prereset(ap); } /** * radisys_pata_error_handler - Probe specified port on PATA host controller * @ap: Port to probe * @classes: * * LOCKING: * None (inherited from caller). */ static void radisys_pata_error_handler(struct ata_port *ap) { ata_bmdma_drive_eh(ap, radisys_pre_reset, ata_std_softreset, NULL, ata_std_postreset); } /** * radisys_set_piomode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring * @adev: um * * Set PIO mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void radisys_set_piomode (struct ata_port *ap, struct ata_device *adev) { unsigned int pio = adev->pio_mode - XFER_PIO_0; struct pci_dev *dev = to_pci_dev(ap->host->dev); u16 idetm_data; int control = 0; /* * See Intel Document 298600-004 for the timing programing rules * for PIIX/ICH. Note that the early PIIX does not have the slave * timing port at 0x44. The Radisys is a relative of the PIIX * but not the same so be careful. */ static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, /* Check me */ { 0, 0 }, { 1, 1 }, { 2, 2 }, { 3, 3 }, }; if (pio > 0) control |= 1; /* TIME1 enable */ if (ata_pio_need_iordy(adev)) control |= 2; /* IE IORDY */ pci_read_config_word(dev, 0x40, &idetm_data); /* Enable IE and TIME as appropriate. Clear the other drive timing bits */ idetm_data &= 0xCCCC; idetm_data |= (control << (4 * adev->devno)); idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); pci_write_config_word(dev, 0x40, idetm_data); /* Track which port is configured */ ap->private_data = adev; } /** * radisys_set_dmamode - Initialize host controller PATA DMA timings * @ap: Port whose timings we are configuring * @adev: Device to program * @isich: True if the device is an ICH and has IOCFG registers * * Set MWDMA mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void radisys_set_dmamode (struct ata_port *ap, struct ata_device *adev) { struct pci_dev *dev = to_pci_dev(ap->host->dev); u16 idetm_data; u8 udma_enable; static const /* ISP RTC */ u8 timings[][2] = { { 0, 0 }, { 0, 0 }, { 1, 1 }, { 2, 2 }, { 3, 3 }, }; /* * MWDMA is driven by the PIO timings. We must also enable * IORDY unconditionally. */ pci_read_config_word(dev, 0x40, &idetm_data); pci_read_config_byte(dev, 0x48, &udma_enable); if (adev->dma_mode < XFER_UDMA_0) { unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0; const unsigned int needed_pio[3] = { XFER_PIO_0, XFER_PIO_3, XFER_PIO_4 }; int pio = needed_pio[mwdma] - XFER_PIO_0; int control = 3; /* IORDY|TIME0 */ /* If the drive MWDMA is faster than it can do PIO then we must force PIO0 for PIO cycles. */ if (adev->pio_mode < needed_pio[mwdma]) control = 1; /* Mask out the relevant control and timing bits we will load. Also clear the other drive TIME register as a precaution */ idetm_data &= 0xCCCC; idetm_data |= control << (4 * adev->devno); idetm_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8); udma_enable &= ~(1 << adev->devno); } else { u8 udma_mode; /* UDMA66 on: UDMA 33 and 66 are switchable via register 0x4A */ pci_read_config_byte(dev, 0x4A, &udma_mode); if (adev->xfer_mode == XFER_UDMA_2) udma_mode &= ~ (1 << adev->devno); else /* UDMA 4 */ udma_mode |= (1 << adev->devno); pci_write_config_byte(dev, 0x4A, udma_mode); udma_enable |= (1 << adev->devno); } pci_write_config_word(dev, 0x40, idetm_data); pci_write_config_byte(dev, 0x48, udma_enable); /* Track which port is configured */ ap->private_data = adev; } /** * radisys_qc_issue_prot - command issue * @qc: command pending * * Called when the libata layer is about to issue a command. We wrap * this interface so that we can load the correct ATA timings if * neccessary. Our logic also clears TIME0/TIME1 for the other device so * that, even if we get this wrong, cycles to the other device will * be made PIO0. */ static unsigned int radisys_qc_issue_prot(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; struct ata_device *adev = qc->dev; if (adev != ap->private_data) { /* UDMA timing is not shared */ if (adev->dma_mode < XFER_UDMA_0) { if (adev->dma_mode) radisys_set_dmamode(ap, adev); else if (adev->pio_mode) radisys_set_piomode(ap, adev); } } return ata_qc_issue_prot(qc); } static struct scsi_host_template radisys_sht = { .module = THIS_MODULE, .name = DRV_NAME, .ioctl = ata_scsi_ioctl, .queuecommand = ata_scsi_queuecmd, .can_queue = ATA_DEF_QUEUE, .this_id = ATA_SHT_THIS_ID, .sg_tablesize = LIBATA_MAX_PRD, .max_sectors = ATA_MAX_SECTORS, .cmd_per_lun = ATA_SHT_CMD_PER_LUN, .emulated = ATA_SHT_EMULATED, .use_clustering = ATA_SHT_USE_CLUSTERING, .proc_name = DRV_NAME, .dma_boundary = ATA_DMA_BOUNDARY, .slave_configure = ata_scsi_slave_config, .bios_param = ata_std_bios_param, }; static const struct ata_port_operations radisys_pata_ops = { .port_disable = ata_port_disable, .set_piomode = radisys_set_piomode, .set_dmamode = radisys_set_dmamode, .mode_filter = ata_pci_default_filter, .tf_load = ata_tf_load, .tf_read = ata_tf_read, .check_status = ata_check_status, .exec_command = ata_exec_command, .dev_select = ata_std_dev_select, .freeze = ata_bmdma_freeze, .thaw = ata_bmdma_thaw, .error_handler = radisys_pata_error_handler, .post_internal_cmd = ata_bmdma_post_internal_cmd, .bmdma_setup = ata_bmdma_setup, .bmdma_start = ata_bmdma_start, .bmdma_stop = ata_bmdma_stop, .bmdma_status = ata_bmdma_status, .qc_prep = ata_qc_prep, .qc_issue = radisys_qc_issue_prot, .data_xfer = ata_pio_data_xfer, .irq_handler = ata_interrupt, .irq_clear = ata_bmdma_irq_clear, .port_start = ata_port_start, .port_stop = ata_port_stop, .host_stop = ata_host_stop, }; /** * radisys_init_one - Register PIIX ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in radisys_pci_tbl matching with @pdev * * Called from kernel PCI layer. We probe for combined mode (sigh), * and then hand over control to libata, for it to do the rest. * * LOCKING: * Inherited from PCI layer (may sleep). * * RETURNS: * Zero on success, or -ERRNO value. */ static int radisys_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) { static int printed_version; static struct ata_port_info info = { .sht = &radisys_sht, .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST, .pio_mask = 0x1f, /* pio0-4 */ .mwdma_mask = 0x07, /* mwdma1-2 */ .udma_mask = 0x14, /* UDMA33/66 only */ .port_ops = &radisys_pata_ops, }; static struct ata_port_info *port_info[2] = { &info, &info }; if (!printed_version++) dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n"); return ata_pci_init_one(pdev, port_info, 2); } static const struct pci_device_id radisys_pci_tbl[] = { { PCI_VDEVICE(RADISYS, 0x8201), }, { } /* terminate list */ }; static struct pci_driver radisys_pci_driver = { .name = DRV_NAME, .id_table = radisys_pci_tbl, .probe = radisys_init_one, .remove = ata_pci_remove_one, }; static int __init radisys_init(void) { return pci_register_driver(&radisys_pci_driver); } static void __exit radisys_exit(void) { pci_unregister_driver(&radisys_pci_driver); } module_init(radisys_init); module_exit(radisys_exit); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("SCSI low-level driver for Radisys R82600 controllers"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, radisys_pci_tbl); MODULE_VERSION(DRV_VERSION);