--- /dev/null
+/*
+ * pata_sl82c105.c - SL82C105 PATA for new ATA layer
+ * (C) 2005 Red Hat Inc
+ * Alan Cox <alan@redhat.com>
+ *
+ * Based in part on linux/drivers/ide/pci/sl82c105.c
+ * SL82C105/Winbond 553 IDE driver
+ *
+ * and in part on the documentation and errata sheet
+ */
+
+#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 <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_sl82c105"
+#define DRV_VERSION "0.2.3"
+
+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
+ * @ap: ATA port
+ *
+ * Set up cable type and use generic probe init
+ */
+
+static int sl82c105_pre_reset(struct ata_port *ap)
+{
+ static const struct pci_bits sl82c105_enable_bits[] = {
+ { 0x40, 1, 0x01, 0x01 },
+ { 0x40, 1, 0x10, 0x10 }
+ };
+ 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;
+ ap->cbl = ATA_CBL_PATA40;
+ return ata_std_prereset(ap);
+}
+
+
+static void sl82c105_error_handler(struct ata_port *ap)
+{
+ ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+
+/**
+ * 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_set_dmamode - set initial DMA mode data
+ * @ap: ATA interface
+ * @adev: ATA device
+ *
+ * Called to do the DMA mode setup. This replaces the PIO timings
+ * for the device in question. Set appropriate PIO timings not DMA
+ * timings at this point.
+ */
+
+static void sl82c105_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+ switch(adev->dma_mode) {
+ case XFER_MW_DMA_0:
+ sl82c105_configure_piomode(ap, adev, 1);
+ break;
+ case XFER_MW_DMA_1:
+ sl82c105_configure_piomode(ap, adev, 3);
+ break;
+ case XFER_MW_DMA_2:
+ sl82c105_configure_piomode(ap, adev, 3);
+ break;
+ default:
+ BUG();
+ }
+}
+
+/**
+ * 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;
+
+ sl82c105_reset_engine(ap);
+
+ /* Set the clocks for DMA */
+ sl82c105_configure_dmamode(ap, qc->dev);
+ /* Activate DMA */
+ ata_bmdma_start(qc);
+}
+
+/**
+ * sl82c105_bmdma_end - 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,
+ * so no actual eng_timeout handler is required.
+ *
+ * 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);
+
+ /* This will redo the initial setup of the DMA device to matching
+ PIO timings */
+ sl82c105_set_dmamode(ap, qc->dev);
+}
+
+static struct scsi_host_template sl82c105_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,
+ .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,
+ .slave_destroy = ata_scsi_slave_destroy,
+ .bios_param = ata_std_bios_param,
+};
+
+static struct ata_port_operations sl82c105_port_ops = {
+ .port_disable = ata_port_disable,
+ .set_piomode = sl82c105_set_piomode,
+ .set_dmamode = sl82c105_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,
+
+ .error_handler = sl82c105_error_handler,
+
+ .bmdma_setup = ata_bmdma_setup,
+ .bmdma_start = sl82c105_bmdma_start,
+ .bmdma_stop = sl82c105_bmdma_stop,
+ .bmdma_status = ata_bmdma_status,
+
+ .qc_prep = ata_qc_prep,
+ .qc_issue = ata_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
+};
+
+/**
+ * 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;
+ u8 rev;
+
+ /*
+ * 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_read_config_byte(bridge, PCI_REVISION_ID, &rev);
+
+ pci_dev_put(bridge);
+ return rev;
+}
+
+
+static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ static struct ata_port_info info_dma = {
+ .sht = &sl82c105_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .port_ops = &sl82c105_port_ops
+ };
+ static struct ata_port_info info_early = {
+ .sht = &sl82c105_sht,
+ .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+ .pio_mask = 0x1f,
+ .port_ops = &sl82c105_port_ops
+ };
+ static struct ata_port_info *port_info[2] = { &info_early, &info_early };
+ u32 val;
+ int rev;
+
+ rev = sl82c105_bridge_revision(dev);
+
+ if (rev == -1)
+ dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
+ else if (rev <= 5)
+ dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
+ else {
+ port_info[0] = &info_dma;
+ port_info[1] = &info_dma;
+ }
+
+ pci_read_config_dword(dev, 0x40, &val);
+ val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
+ pci_write_config_dword(dev, 0x40, val);
+
+
+ return ata_pci_init_one(dev, port_info, 1); /* For now */
+}
+
+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
+};
+
+static int __init sl82c105_init(void)
+{
+ return pci_register_driver(&sl82c105_pci_driver);
+}
+
+static void __exit sl82c105_exit(void)
+{
+ pci_unregister_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);
+
+module_init(sl82c105_init);
+module_exit(sl82c105_exit);
git://git.onelab.eu / linux-2.6.git / blobdiff