1 files changed, 280 insertions, 0 deletions
diff --git a/drivers/ata/pata_platform.c b/drivers/ata/pata_platform.c
new file mode 100644
index 0000000..77e4e3b
--- /dev/null
+++ b/drivers/ata/pata_platform.c
@@ -0,0 +1,280 @@
+/*
+ * 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/init.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_link_for_each_dev(dev, link) {
+		if (ata_dev_enabled(dev)) {
+			/* 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_printk(dev, KERN_INFO, "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,
+	.port_start		= ATA_OP_NULL,
+};
+
+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
+ *
+ *	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 __devinit __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 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;
+	}
+
+	/*
+	 * 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,
+				io_res->end - io_res->start + 1);
+		ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
+				ctl_res->end - ctl_res->start + 1);
+	} else {
+		ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
+				io_res->end - io_res->start + 1);
+		ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
+				ctl_res->end - ctl_res->start + 1);
+	}
+	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, &pata_platform_sht);
+}
+EXPORT_SYMBOL_GPL(__pata_platform_probe);
+
+/**
+ *	__pata_platform_remove		-	unplug a platform interface
+ *	@dev: device
+ *
+ *	A platform bus ATA device has been unplugged. Perform the needed
+ *	cleanup. Also called on module unload for any active devices.
+ */
+int __devexit __pata_platform_remove(struct device *dev)
+{
+	struct ata_host *host = dev_get_drvdata(dev);
+
+	ata_host_detach(host);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(__pata_platform_remove);
+
+static int __devinit 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 = pdev->dev.platform_data;
+
+	/*
+	 * 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);
+	if (irq_res)
+		irq_res->flags = pp_info ? pp_info->irq_flags : 0;
+
+	return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
+				     pp_info ? pp_info->ioport_shift : 0,
+				     pio_mask);
+}
+
+static int __devexit pata_platform_remove(struct platform_device *pdev)
+{
+	return __pata_platform_remove(&pdev->dev);
+}
+
+static struct platform_driver pata_platform_driver = {
+	.probe		= pata_platform_probe,
+	.remove		= __devexit_p(pata_platform_remove),
+	.driver = {
+		.name		= DRV_NAME,
+		.owner		= THIS_MODULE,
+	},
+};
+
+static int __init pata_platform_init(void)
+{
+	return platform_driver_register(&pata_platform_driver);
+}
+
+static void __exit pata_platform_exit(void)
+{
+	platform_driver_unregister(&pata_platform_driver);
+}
+module_init(pata_platform_init);
+module_exit(pata_platform_exit);
+
+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);