| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * pata_sl82c105.c - SL82C105 PATA for new ATA layer |
| * (C) 2005 Red Hat Inc |
| * (C) 2011 Bartlomiej Zolnierkiewicz |
| * |
| * Based in part on linux/drivers/ide/pci/sl82c105.c |
| * SL82C105/Winbond 553 IDE driver |
| * |
| * and in part on the documentation and errata sheet |
| * |
| * |
| * Note: The controller like many controllers has shared timings for |
| * PIO and DMA. We thus flip to the DMA timings in dma_start and flip back |
| * in the dma_stop function. Thus we actually don't need a set_dmamode |
| * method as the PIO method is always called and will set the right PIO |
| * timing parameters. |
| */ |
| |
| #include <linux/kernel.h> |
| #include <linux/module.h> |
| #include <linux/pci.h> |
| #include <linux/blkdev.h> |
| #include <linux/delay.h> |
| #include <scsi/scsi_host.h> |
| #include <linux/libata.h> |
| |
| #define DRV_NAME "pata_sl82c105" |
| #define DRV_VERSION "0.3.3" |
| |
| enum { |
| /* |
| * SL82C105 PCI config register 0x40 bits. |
| */ |
| CTRL_IDE_IRQB = (1 << 30), |
| CTRL_IDE_IRQA = (1 << 28), |
| CTRL_LEGIRQ = (1 << 11), |
| CTRL_P1F16 = (1 << 5), |
| CTRL_P1EN = (1 << 4), |
| CTRL_P0F16 = (1 << 1), |
| CTRL_P0EN = (1 << 0) |
| }; |
| |
| /** |
| * sl82c105_pre_reset - probe begin |
| * @link: ATA link |
| * @deadline: deadline jiffies for the operation |
| * |
| * Set up cable type and use generic probe init |
| */ |
| |
| static int sl82c105_pre_reset(struct ata_link *link, unsigned long deadline) |
| { |
| static const struct pci_bits sl82c105_enable_bits[] = { |
| { 0x40, 1, 0x01, 0x01 }, |
| { 0x40, 1, 0x10, 0x10 } |
| }; |
| struct ata_port *ap = link->ap; |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| |
| if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no])) |
| return -ENOENT; |
| return ata_sff_prereset(link, deadline); |
| } |
| |
| |
| /** |
| * sl82c105_configure_piomode - set chip PIO timing |
| * @ap: ATA interface |
| * @adev: ATA device |
| * @pio: PIO mode |
| * |
| * Called to do the PIO mode setup. Our timing registers are shared |
| * so a configure_dmamode call will undo any work we do here and vice |
| * versa |
| */ |
| |
| static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio) |
| { |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| static u16 pio_timing[5] = { |
| 0x50D, 0x407, 0x304, 0x242, 0x240 |
| }; |
| u16 dummy; |
| int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno); |
| |
| pci_write_config_word(pdev, timing, pio_timing[pio]); |
| /* Can we lose this oddity of the old driver */ |
| pci_read_config_word(pdev, timing, &dummy); |
| } |
| |
| /** |
| * sl82c105_set_piomode - set initial PIO mode data |
| * @ap: ATA interface |
| * @adev: ATA device |
| * |
| * Called to do the PIO mode setup. Our timing registers are shared |
| * but we want to set the PIO timing by default. |
| */ |
| |
| static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev) |
| { |
| sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0); |
| } |
| |
| /** |
| * sl82c105_configure_dmamode - set DMA mode in chip |
| * @ap: ATA interface |
| * @adev: ATA device |
| * |
| * Load DMA cycle times into the chip ready for a DMA transfer |
| * to occur. |
| */ |
| |
| static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev) |
| { |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| static u16 dma_timing[3] = { |
| 0x707, 0x201, 0x200 |
| }; |
| u16 dummy; |
| int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno); |
| int dma = adev->dma_mode - XFER_MW_DMA_0; |
| |
| pci_write_config_word(pdev, timing, dma_timing[dma]); |
| /* Can we lose this oddity of the old driver */ |
| pci_read_config_word(pdev, timing, &dummy); |
| } |
| |
| /** |
| * sl82c105_reset_engine - Reset the DMA engine |
| * @ap: ATA interface |
| * |
| * The sl82c105 has some serious problems with the DMA engine |
| * when transfers don't run as expected or ATAPI is used. The |
| * recommended fix is to reset the engine each use using a chip |
| * test register. |
| */ |
| |
| static void sl82c105_reset_engine(struct ata_port *ap) |
| { |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| u16 val; |
| |
| pci_read_config_word(pdev, 0x7E, &val); |
| pci_write_config_word(pdev, 0x7E, val | 4); |
| pci_write_config_word(pdev, 0x7E, val & ~4); |
| } |
| |
| /** |
| * sl82c105_bmdma_start - DMA engine begin |
| * @qc: ATA command |
| * |
| * Reset the DMA engine each use as recommended by the errata |
| * document. |
| * |
| * FIXME: if we switch clock at BMDMA start/end we might get better |
| * PIO performance on DMA capable devices. |
| */ |
| |
| static void sl82c105_bmdma_start(struct ata_queued_cmd *qc) |
| { |
| struct ata_port *ap = qc->ap; |
| |
| udelay(100); |
| sl82c105_reset_engine(ap); |
| udelay(100); |
| |
| /* Set the clocks for DMA */ |
| sl82c105_configure_dmamode(ap, qc->dev); |
| /* Activate DMA */ |
| ata_bmdma_start(qc); |
| } |
| |
| /** |
| * sl82c105_bmdma_stop - DMA engine stop |
| * @qc: ATA command |
| * |
| * Reset the DMA engine each use as recommended by the errata |
| * document. |
| * |
| * This function is also called to turn off DMA when a timeout occurs |
| * during DMA operation. In both cases we need to reset the engine. |
| * |
| * We assume bmdma_stop is always called if bmdma_start as called. If |
| * not then we may need to wrap qc_issue. |
| */ |
| |
| static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc) |
| { |
| struct ata_port *ap = qc->ap; |
| |
| ata_bmdma_stop(qc); |
| sl82c105_reset_engine(ap); |
| udelay(100); |
| |
| /* This will redo the initial setup of the DMA device to matching |
| PIO timings */ |
| sl82c105_set_piomode(ap, qc->dev); |
| } |
| |
| /** |
| * sl82c105_qc_defer - implement serialization |
| * @qc: command |
| * |
| * We must issue one command per host not per channel because |
| * of the reset bug. |
| * |
| * Q: is the scsi host lock sufficient ? |
| */ |
| |
| static int sl82c105_qc_defer(struct ata_queued_cmd *qc) |
| { |
| struct ata_host *host = qc->ap->host; |
| struct ata_port *alt = host->ports[1 ^ qc->ap->port_no]; |
| int rc; |
| |
| /* First apply the usual rules */ |
| rc = ata_std_qc_defer(qc); |
| if (rc != 0) |
| return rc; |
| |
| /* Now apply serialization rules. Only allow a command if the |
| other channel state machine is idle */ |
| if (alt && alt->qc_active) |
| return ATA_DEFER_PORT; |
| return 0; |
| } |
| |
| static bool sl82c105_sff_irq_check(struct ata_port *ap) |
| { |
| struct pci_dev *pdev = to_pci_dev(ap->host->dev); |
| u32 val, mask = ap->port_no ? CTRL_IDE_IRQB : CTRL_IDE_IRQA; |
| |
| pci_read_config_dword(pdev, 0x40, &val); |
| |
| return val & mask; |
| } |
| |
| static const struct scsi_host_template sl82c105_sht = { |
| ATA_BMDMA_SHT(DRV_NAME), |
| }; |
| |
| static struct ata_port_operations sl82c105_port_ops = { |
| .inherits = &ata_bmdma_port_ops, |
| .qc_defer = sl82c105_qc_defer, |
| .bmdma_start = sl82c105_bmdma_start, |
| .bmdma_stop = sl82c105_bmdma_stop, |
| .cable_detect = ata_cable_40wire, |
| .set_piomode = sl82c105_set_piomode, |
| .prereset = sl82c105_pre_reset, |
| .sff_irq_check = sl82c105_sff_irq_check, |
| }; |
| |
| /** |
| * sl82c105_bridge_revision - find bridge version |
| * @pdev: PCI device for the ATA function |
| * |
| * Locates the PCI bridge associated with the ATA function and |
| * providing it is a Winbond 553 reports the revision. If it cannot |
| * find a revision or the right device it returns -1 |
| */ |
| |
| static int sl82c105_bridge_revision(struct pci_dev *pdev) |
| { |
| struct pci_dev *bridge; |
| |
| /* |
| * The bridge should be part of the same device, but function 0. |
| */ |
| bridge = pci_get_slot(pdev->bus, |
| PCI_DEVFN(PCI_SLOT(pdev->devfn), 0)); |
| if (!bridge) |
| return -1; |
| |
| /* |
| * Make sure it is a Winbond 553 and is an ISA bridge. |
| */ |
| if (bridge->vendor != PCI_VENDOR_ID_WINBOND || |
| bridge->device != PCI_DEVICE_ID_WINBOND_83C553 || |
| bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) { |
| pci_dev_put(bridge); |
| return -1; |
| } |
| /* |
| * We need to find function 0's revision, not function 1 |
| */ |
| pci_dev_put(bridge); |
| return bridge->revision; |
| } |
| |
| static void sl82c105_fixup(struct pci_dev *pdev) |
| { |
| u32 val; |
| |
| pci_read_config_dword(pdev, 0x40, &val); |
| val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16; |
| pci_write_config_dword(pdev, 0x40, val); |
| } |
| |
| static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id) |
| { |
| static const struct ata_port_info info_dma = { |
| .flags = ATA_FLAG_SLAVE_POSS, |
| .pio_mask = ATA_PIO4, |
| .mwdma_mask = ATA_MWDMA2, |
| .port_ops = &sl82c105_port_ops |
| }; |
| static const struct ata_port_info info_early = { |
| .flags = ATA_FLAG_SLAVE_POSS, |
| .pio_mask = ATA_PIO4, |
| .port_ops = &sl82c105_port_ops |
| }; |
| /* for now use only the first port */ |
| const struct ata_port_info *ppi[] = { &info_early, |
| NULL }; |
| int rev; |
| int rc; |
| |
| rc = pcim_enable_device(dev); |
| if (rc) |
| return rc; |
| |
| rev = sl82c105_bridge_revision(dev); |
| |
| if (rev == -1) |
| dev_warn(&dev->dev, |
| "pata_sl82c105: Unable to find bridge, disabling DMA\n"); |
| else if (rev <= 5) |
| dev_warn(&dev->dev, |
| "pata_sl82c105: Early bridge revision, no DMA available\n"); |
| else |
| ppi[0] = &info_dma; |
| |
| sl82c105_fixup(dev); |
| |
| return ata_pci_bmdma_init_one(dev, ppi, &sl82c105_sht, NULL, 0); |
| } |
| |
| #ifdef CONFIG_PM_SLEEP |
| static int sl82c105_reinit_one(struct pci_dev *pdev) |
| { |
| struct ata_host *host = pci_get_drvdata(pdev); |
| int rc; |
| |
| rc = ata_pci_device_do_resume(pdev); |
| if (rc) |
| return rc; |
| |
| sl82c105_fixup(pdev); |
| |
| ata_host_resume(host); |
| return 0; |
| } |
| #endif |
| |
| static const struct pci_device_id sl82c105[] = { |
| { PCI_VDEVICE(WINBOND, PCI_DEVICE_ID_WINBOND_82C105), }, |
| |
| { }, |
| }; |
| |
| static struct pci_driver sl82c105_pci_driver = { |
| .name = DRV_NAME, |
| .id_table = sl82c105, |
| .probe = sl82c105_init_one, |
| .remove = ata_pci_remove_one, |
| #ifdef CONFIG_PM_SLEEP |
| .suspend = ata_pci_device_suspend, |
| .resume = sl82c105_reinit_one, |
| #endif |
| }; |
| |
| module_pci_driver(sl82c105_pci_driver); |
| |
| MODULE_AUTHOR("Alan Cox"); |
| MODULE_DESCRIPTION("low-level driver for Sl82c105"); |
| MODULE_LICENSE("GPL"); |
| MODULE_DEVICE_TABLE(pci, sl82c105); |
| MODULE_VERSION(DRV_VERSION); |