/* * pata_ns87415.c - NS87415 (non PARISC) PATA * * (C) 2005 Red Hat * * This is a fairly generic MWDMA controller. It has some limitations * as it requires timing reloads on PIO/DMA transitions but it is otherwise * fairly well designed. * * This driver assumes the firmware has left the chip in a valid ST506 * compliant state, either legacy IRQ 14/15 or native INTA shared. You * may need to add platform code if your system fails to do this. * * The same cell appears in the 87560 controller used by some PARISC * systems. This has its own special mountain of errata. * * TODO: * Test PARISC SuperIO * Get someone to test on SPARC * Implement lazy pio/dma switching for better performance * 8bit shared timing. * See if we need to kill the FIFO for ATAPI */ #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "pata_ns87415" #define DRV_VERSION "0.0.1" /** * ns87415_set_mode - Initialize host controller mode timings * @ap: Port whose timings we are configuring * @adev: Device whose timings we are configuring * @mode: Mode to set * * Program the mode registers for this controller, channel and * device. Because the chip is quite an old design we have to do this * for PIO/DMA switches. * * LOCKING: * None (inherited from caller). */ static void ns87415_set_mode(struct ata_port *ap, struct ata_device *adev, u8 mode) { struct pci_dev *dev = to_pci_dev(ap->host->dev); int unit = 2 * ap->port_no + adev->devno; int timing = 0x44 + 2 * unit; unsigned long T = 1000000000 / 33333; /* PCI clocks */ struct ata_timing t; u16 clocking; u8 iordy; u8 status; /* Timing register format is 17 - low nybble read timing with the high nybble being 16 - x for recovery time in PCI clocks */ ata_timing_compute(adev, adev->pio_mode, &t, T, 0); clocking = 17 - clamp_val(t.active, 2, 17); clocking |= (16 - clamp_val(t.recover, 1, 16)) << 4; /* Use the same timing for read and write bytes */ clocking |= (clocking << 8); pci_write_config_word(dev, timing, clocking); /* Set the IORDY enable versus DMA enable on or off properly */ pci_read_config_byte(dev, 0x42, &iordy); iordy &= ~(1 << (4 + unit)); if (mode >= XFER_MW_DMA_0 || !ata_pio_need_iordy(adev)) iordy |= (1 << (4 + unit)); /* Paranoia: We shouldn't ever get here with busy write buffers but if so wait */ pci_read_config_byte(dev, 0x43, &status); while (status & 0x03) { udelay(1); pci_read_config_byte(dev, 0x43, &status); } /* Flip the IORDY/DMA bits now we are sure the write buffers are clear */ pci_write_config_byte(dev, 0x42, iordy); /* TODO: Set byte 54 command timing to the best 8bit mode shared by all four devices */ } /** * ns87415_set_piomode - Initialize host controller PATA PIO timings * @ap: Port whose timings we are configuring * @adev: Device to program * * Set PIO mode for device, in host controller PCI config space. * * LOCKING: * None (inherited from caller). */ static void ns87415_set_piomode(struct ata_port *ap, struct ata_device *adev) { ns87415_set_mode(ap, adev, adev->pio_mode); } /** * ns87415_bmdma_setup - Set up DMA * @qc: Command block * * Set up for bus masterng DMA. We have to do this ourselves * rather than use the helper due to a chip erratum */ static void ns87415_bmdma_setup(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; unsigned int rw = (qc->tf.flags & ATA_TFLAG_WRITE); u8 dmactl; /* load PRD table addr. */ mb(); /* make sure PRD table writes are visible to controller */ iowrite32(ap->bmdma_prd_dma, ap->ioaddr.bmdma_addr + ATA_DMA_TABLE_OFS); /* specify data direction, triple-check start bit is clear */ dmactl = ioread8(ap->ioaddr.bmdma_addr + ATA_DMA_CMD); dmactl &= ~(ATA_DMA_WR | ATA_DMA_START); /* Due to an erratum we need to write these bits to the wrong place - which does save us an I/O bizarrely */ dmactl |= ATA_DMA_INTR | ATA_DMA_ERR; if (!rw) dmactl |= ATA_DMA_WR; iowrite8(dmactl, ap->ioaddr.bmdma_addr + ATA_DMA_CMD); /* issue r/w command */ ap->ops->sff_exec_command(ap, &qc->tf); } /** * ns87415_bmdma_start - Begin DMA transfer * @qc: Command block * * Switch the timings for the chip and set up for a DMA transfer * before the DMA burst begins. * * FIXME: We should do lazy switching on bmdma_start versus * ata_pio_data_xfer for better performance. */ static void ns87415_bmdma_start(struct ata_queued_cmd *qc) { ns87415_set_mode(qc->ap, qc->dev, qc->dev->dma_mode); ata_bmdma_start(qc); } /** * ns87415_bmdma_stop - End DMA transfer * @qc: Command block * * End DMA mode and switch the controller back into PIO mode */ static void ns87415_bmdma_stop(struct ata_queued_cmd *qc) { ata_bmdma_stop(qc); ns87415_set_mode(qc->ap, qc->dev, qc->dev->pio_mode); } /** * ns87415_irq_clear - Clear interrupt * @ap: Channel to clear * * Erratum: Due to a chip bug regisers 02 and 0A bit 1 and 2 (the * error bits) are reset by writing to register 00 or 08. */ static void ns87415_irq_clear(struct ata_port *ap) { void __iomem *mmio = ap->ioaddr.bmdma_addr; if (!mmio) return; iowrite8((ioread8(mmio + ATA_DMA_CMD) | ATA_DMA_INTR | ATA_DMA_ERR), mmio + ATA_DMA_CMD); } /** * ns87415_check_atapi_dma - ATAPI DMA filter * @qc: Command block * * Disable ATAPI DMA (for now). We may be able to do DMA if we * kill the prefetching. This isn't clear. */ static int ns87415_check_atapi_dma(struct ata_queued_cmd *qc) { return -EOPNOTSUPP; } #if defined(CONFIG_SUPERIO) /* SUPERIO 87560 is a PoS chip that NatSem denies exists. * Unfortunately, it's built-in on all Astro-based PA-RISC workstations * which use the integrated NS87514 cell for CD-ROM support. * i.e we have to support for CD-ROM installs. * See drivers/parisc/superio.c for more gory details. * * Workarounds taken from drivers/ide/pci/ns87415.c */ #include #define SUPERIO_IDE_MAX_RETRIES 25 /** * ns87560_read_buggy - workaround buggy Super I/O chip * @port: Port to read * * Work around chipset problems in the 87560 SuperIO chip */ static u8 ns87560_read_buggy(void __iomem *port) { u8 tmp; int retries = SUPERIO_IDE_MAX_RETRIES; do { tmp = ioread8(port); if (tmp != 0) return tmp; udelay(50); } while(retries-- > 0); return tmp; } /** * ns87560_check_status * @ap: channel to check * * Return the status of the channel working around the * 87560 flaws. */ static u8 ns87560_check_status(struct ata_port *ap) { return ns87560_read_buggy(ap->ioaddr.status_addr); } /** * ns87560_tf_read - input device's ATA taskfile shadow registers * @ap: Port from which input is read * @tf: ATA taskfile register set for storing input * * Reads ATA taskfile registers for currently-selected device * into @tf. Work around the 87560 bugs. * * LOCKING: * Inherited from caller. */ void ns87560_tf_read(struct ata_port *ap, struct ata_taskfile *tf) { struct ata_ioports *ioaddr = &ap->ioaddr; tf->command = ns87560_check_status(ap); tf->feature = ioread8(ioaddr->error_addr); tf->nsect = ioread8(ioaddr->nsect_addr); tf->lbal = ioread8(ioaddr->lbal_addr); tf->lbam = ioread8(ioaddr->lbam_addr); tf->lbah = ioread8(ioaddr->lbah_addr); tf->device = ns87560_read_buggy(ioaddr->device_addr); if (tf->flags & ATA_TFLAG_LBA48) { iowrite8(tf->ctl | ATA_HOB, ioaddr->ctl_addr); tf->hob_feature = ioread8(ioaddr->error_addr); tf->hob_nsect = ioread8(ioaddr->nsect_addr); tf->hob_lbal = ioread8(ioaddr->lbal_addr); tf->hob_lbam = ioread8(ioaddr->lbam_addr); tf->hob_lbah = ioread8(ioaddr->lbah_addr); iowrite8(tf->ctl, ioaddr->ctl_addr); ap->last_ctl = tf->ctl; } } /** * ns87560_bmdma_status * @ap: channel to check * * Return the DMA status of the channel working around the * 87560 flaws. */ static u8 ns87560_bmdma_status(struct ata_port *ap) { return ns87560_read_buggy(ap->ioaddr.bmdma_addr + ATA_DMA_STATUS); } #endif /* 87560 SuperIO Support */ static struct ata_port_operations ns87415_pata_ops = { .inherits = &ata_bmdma_port_ops, .check_atapi_dma = ns87415_check_atapi_dma, .bmdma_setup = ns87415_bmdma_setup, .bmdma_start = ns87415_bmdma_start, .bmdma_stop = ns87415_bmdma_stop, .sff_irq_clear = ns87415_irq_clear, .cable_detect = ata_cable_40wire, .set_piomode = ns87415_set_piomode, }; #if defined(CONFIG_SUPERIO) static struct ata_port_operations ns87560_pata_ops = { .inherits = &ns87415_pata_ops, .sff_tf_read = ns87560_tf_read, .sff_check_status = ns87560_check_status, .bmdma_status = ns87560_bmdma_status, }; #endif static struct scsi_host_template ns87415_sht = { ATA_BMDMA_SHT(DRV_NAME), }; static void ns87415_fixup(struct pci_dev *pdev) { /* Select 512 byte sectors */ pci_write_config_byte(pdev, 0x55, 0xEE); /* Select PIO0 8bit clocking */ pci_write_config_byte(pdev, 0x54, 0xB7); } /** * ns87415_init_one - Register 87415 ATA PCI device with kernel services * @pdev: PCI device to register * @ent: Entry in ns87415_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 ns87415_init_one (struct pci_dev *pdev, const struct pci_device_id *ent) { static int printed_version; static const struct ata_port_info info = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .port_ops = &ns87415_pata_ops, }; const struct ata_port_info *ppi[] = { &info, NULL }; int rc; #if defined(CONFIG_SUPERIO) static const struct ata_port_info info87560 = { .flags = ATA_FLAG_SLAVE_POSS, .pio_mask = ATA_PIO4, .mwdma_mask = ATA_MWDMA2, .port_ops = &ns87560_pata_ops, }; if (PCI_SLOT(pdev->devfn) == 0x0E) ppi[0] = &info87560; #endif if (!printed_version++) dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n"); rc = pcim_enable_device(pdev); if (rc) return rc; ns87415_fixup(pdev); return ata_pci_bmdma_init_one(pdev, ppi, &ns87415_sht, NULL, 0); } static const struct pci_device_id ns87415_pci_tbl[] = { { PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_87415), }, { } /* terminate list */ }; #ifdef CONFIG_PM static int ns87415_reinit_one(struct pci_dev *pdev) { struct ata_host *host = dev_get_drvdata(&pdev->dev); int rc; rc = ata_pci_device_do_resume(pdev); if (rc) return rc; ns87415_fixup(pdev); ata_host_resume(host); return 0; } #endif static struct pci_driver ns87415_pci_driver = { .name = DRV_NAME, .id_table = ns87415_pci_tbl, .probe = ns87415_init_one, .remove = ata_pci_remove_one, #ifdef CONFIG_PM .suspend = ata_pci_device_suspend, .resume = ns87415_reinit_one, #endif }; static int __init ns87415_init(void) { return pci_register_driver(&ns87415_pci_driver); } static void __exit ns87415_exit(void) { pci_unregister_driver(&ns87415_pci_driver); } module_init(ns87415_init); module_exit(ns87415_exit); MODULE_AUTHOR("Alan Cox"); MODULE_DESCRIPTION("ATA low-level driver for NS87415 controllers"); MODULE_LICENSE("GPL"); MODULE_DEVICE_TABLE(pci, ns87415_pci_tbl); MODULE_VERSION(DRV_VERSION);