--- /dev/null
+/*
+ * Generic platform device PATA driver
+ *
+ * Copyright (C) 2006 - 2007 Paul Mundt
+ *
+ * Based on pata_pcmcia:
+ *
+ * Copyright 2005-2006 Red Hat Inc, all rights reserved.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/blkdev.h>
+#include <scsi/scsi_host.h>
+#include <linux/ata.h>
+#include <linux/libata.h>
+#include <linux/platform_device.h>
+#include <linux/ata_platform.h>
+
+#define DRV_NAME "pata_platform"
+#define DRV_VERSION "1.2"
+
+static int pio_mask = 1;
+
+/*
+ * Provide our own set_mode() as we don't want to change anything that has
+ * already been configured..
+ */
+static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
+{
+ struct ata_device *dev;
+
+ ata_for_each_dev(dev, link, ENABLED) {
+ /* We don't really care */
+ dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
+ dev->xfer_shift = ATA_SHIFT_PIO;
+ dev->flags |= ATA_DFLAG_PIO;
+ ata_dev_info(dev, "configured for PIO\n");
+ }
+ return 0;
+}
+
+static struct scsi_host_template pata_platform_sht = {
+ ATA_PIO_SHT(DRV_NAME),
+};
+
+static struct ata_port_operations pata_platform_port_ops = {
+ .inherits = &ata_sff_port_ops,
+ .sff_data_xfer = ata_sff_data_xfer_noirq,
+ .cable_detect = ata_cable_unknown,
+ .set_mode = pata_platform_set_mode,
+};
+
+static void pata_platform_setup_port(struct ata_ioports *ioaddr,
+ unsigned int shift)
+{
+ /* Fixup the port shift for platforms that need it */
+ ioaddr->data_addr = ioaddr->cmd_addr + (ATA_REG_DATA << shift);
+ ioaddr->error_addr = ioaddr->cmd_addr + (ATA_REG_ERR << shift);
+ ioaddr->feature_addr = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
+ ioaddr->nsect_addr = ioaddr->cmd_addr + (ATA_REG_NSECT << shift);
+ ioaddr->lbal_addr = ioaddr->cmd_addr + (ATA_REG_LBAL << shift);
+ ioaddr->lbam_addr = ioaddr->cmd_addr + (ATA_REG_LBAM << shift);
+ ioaddr->lbah_addr = ioaddr->cmd_addr + (ATA_REG_LBAH << shift);
+ ioaddr->device_addr = ioaddr->cmd_addr + (ATA_REG_DEVICE << shift);
+ ioaddr->status_addr = ioaddr->cmd_addr + (ATA_REG_STATUS << shift);
+ ioaddr->command_addr = ioaddr->cmd_addr + (ATA_REG_CMD << shift);
+}
+
+/**
+ * __pata_platform_probe - attach a platform interface
+ * @dev: device
+ * @io_res: Resource representing I/O base
+ * @ctl_res: Resource representing CTL base
+ * @irq_res: Resource representing IRQ and its flags
+ * @ioport_shift: I/O port shift
+ * @__pio_mask: PIO mask
+ * @sht: scsi_host_template to use when registering
+ *
+ * Register a platform bus IDE interface. Such interfaces are PIO and we
+ * assume do not support IRQ sharing.
+ *
+ * Platform devices are expected to contain at least 2 resources per port:
+ *
+ * - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
+ * - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
+ *
+ * and optionally:
+ *
+ * - IRQ (IORESOURCE_IRQ)
+ *
+ * If the base resources are both mem types, the ioremap() is handled
+ * here. For IORESOURCE_IO, it's assumed that there's no remapping
+ * necessary.
+ *
+ * If no IRQ resource is present, PIO polling mode is used instead.
+ */
+int __pata_platform_probe(struct device *dev, struct resource *io_res,
+ struct resource *ctl_res, struct resource *irq_res,
+ unsigned int ioport_shift, int __pio_mask,
+ struct scsi_host_template *sht)
+{
+ struct ata_host *host;
+ struct ata_port *ap;
+ unsigned int mmio;
+ int irq = 0;
+ int irq_flags = 0;
+
+ /*
+ * Check for MMIO
+ */
+ mmio = (( io_res->flags == IORESOURCE_MEM) &&
+ (ctl_res->flags == IORESOURCE_MEM));
+
+ /*
+ * And the IRQ
+ */
+ if (irq_res && irq_res->start > 0) {
+ irq = irq_res->start;
+ irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
+ }
+
+ /*
+ * Now that that's out of the way, wire up the port..
+ */
+ host = ata_host_alloc(dev, 1);
+ if (!host)
+ return -ENOMEM;
+ ap = host->ports[0];
+
+ ap->ops = &pata_platform_port_ops;
+ ap->pio_mask = __pio_mask;
+ ap->flags |= ATA_FLAG_SLAVE_POSS;
+
+ /*
+ * Use polling mode if there's no IRQ
+ */
+ if (!irq) {
+ ap->flags |= ATA_FLAG_PIO_POLLING;
+ ata_port_desc(ap, "no IRQ, using PIO polling");
+ }
+
+ /*
+ * Handle the MMIO case
+ */
+ if (mmio) {
+ ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
+ resource_size(io_res));
+ ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
+ resource_size(ctl_res));
+ } else {
+ ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
+ resource_size(io_res));
+ ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
+ resource_size(ctl_res));
+ }
+ if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
+ dev_err(dev, "failed to map IO/CTL base\n");
+ return -ENOMEM;
+ }
+
+ ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
+
+ pata_platform_setup_port(&ap->ioaddr, ioport_shift);
+
+ ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
+ (unsigned long long)io_res->start,
+ (unsigned long long)ctl_res->start);
+
+ /* activate */
+ return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
+ irq_flags, sht);
+}
+EXPORT_SYMBOL_GPL(__pata_platform_probe);
+
+static int pata_platform_probe(struct platform_device *pdev)
+{
+ struct resource *io_res;
+ struct resource *ctl_res;
+ struct resource *irq_res;
+ struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
+
+ /*
+ * Simple resource validation ..
+ */
+ if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
+ dev_err(&pdev->dev, "invalid number of resources\n");
+ return -EINVAL;
+ }
+
+ /*
+ * Get the I/O base first
+ */
+ io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (io_res == NULL) {
+ io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (unlikely(io_res == NULL))
+ return -EINVAL;
+ }
+
+ /*
+ * Then the CTL base
+ */
+ ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
+ if (ctl_res == NULL) {
+ ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (unlikely(ctl_res == NULL))
+ return -EINVAL;
+ }
+
+ /*
+ * And the IRQ
+ */
+ irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+
+ return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
+ pp_info ? pp_info->ioport_shift : 0,
+ pio_mask, &pata_platform_sht);
+}
+
+static struct platform_driver pata_platform_driver = {
+ .probe = pata_platform_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ },
+};
+
+module_platform_driver(pata_platform_driver);
+
+module_param(pio_mask, int, 0);
+
+MODULE_AUTHOR("Paul Mundt");
+MODULE_DESCRIPTION("low-level driver for platform device ATA");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
+MODULE_ALIAS("platform:" DRV_NAME);
Code Review / kvmfornfv.git / blobdiff