i2o: move to staging

The I2O layer deals with a technology that to say the least didn't catch on
in the market.

The only relevant products are some of the AMI MegaRAID - which supported I2O
and its native mode (The native mode is faster and runs on Linux), an
obscure crypto ethernet card that's now so many years out of date nobody
would use it, the old DPT controllers, which speak their own dialect and
have their own driver - and ermm.. thats about it.

We also know the code isn't in good shape as recently a patch was proposed
and queried as buggy, which in turn showed the existing code was broken
already by prior "clean up" and nobody had noticed that either.

It's coding style robot code nothing more. Like some forgotten corridor
cleaned relentlessly by a lost Roomba but where no user has trodden in years.

Move it to staging and then to /dev/null.

The headers remain as they are shared with dpt_i2o.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 497 insertions, 0 deletions

diff --git a/drivers/staging/i2o/pci.c b/drivers/staging/i2o/pci.c
new file mode 100644
index 000000000000..b3b8a61dd4a6
--- /dev/null
+++ b/drivers/staging/i2o/pci.c
@@ -0,0 +1,497 @@
+/*
+ *	PCI handling of I2O controller
+ *
+ * 	Copyright (C) 1999-2002	Red Hat Software
+ *
+ *	Written by Alan Cox, Building Number Three Ltd
+ *
+ *	This program is free software; you can redistribute it and/or modify it
+ *	under the terms of the GNU General Public License as published by the
+ *	Free Software Foundation; either version 2 of the License, or (at your
+ *	option) any later version.
+ *
+ *	A lot of the I2O message side code from this is taken from the Red
+ *	Creek RCPCI45 adapter driver by Red Creek Communications
+ *
+ *	Fixes/additions:
+ *		Philipp Rumpf
+ *		Juha Sievänen <Juha.Sievanen@cs.Helsinki.FI>
+ *		Auvo Häkkinen <Auvo.Hakkinen@cs.Helsinki.FI>
+ *		Deepak Saxena <deepak@plexity.net>
+ *		Boji T Kannanthanam <boji.t.kannanthanam@intel.com>
+ *		Alan Cox <alan@lxorguk.ukuu.org.uk>:
+ *			Ported to Linux 2.5.
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *			Minor fixes for 2.6.
+ *		Markus Lidel <Markus.Lidel@shadowconnect.com>:
+ *			Support for sysfs included.
+ */
+
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+#include "i2o.h"
+#include <linux/module.h>
+#include "core.h"
+
+#define OSM_DESCRIPTION	"I2O-subsystem"
+
+/* PCI device id table for all I2O controllers */
+static struct pci_device_id i2o_pci_ids[] = {
+	{PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
+	{PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
+	{.vendor = PCI_VENDOR_ID_INTEL,.device = 0x1962,
+	 .subvendor = PCI_VENDOR_ID_PROMISE,.subdevice = PCI_ANY_ID},
+	{0}
+};
+
+/**
+ *	i2o_pci_free - Frees the DMA memory for the I2O controller
+ *	@c: I2O controller to free
+ *
+ *	Remove all allocated DMA memory and unmap memory IO regions. If MTRR
+ *	is enabled, also remove it again.
+ */
+static void i2o_pci_free(struct i2o_controller *c)
+{
+	struct device *dev;
+
+	dev = &c->pdev->dev;
+
+	i2o_dma_free(dev, &c->out_queue);
+	i2o_dma_free(dev, &c->status_block);
+	kfree(c->lct);
+	i2o_dma_free(dev, &c->dlct);
+	i2o_dma_free(dev, &c->hrt);
+	i2o_dma_free(dev, &c->status);
+
+	if (c->raptor && c->in_queue.virt)
+		iounmap(c->in_queue.virt);
+
+	if (c->base.virt)
+		iounmap(c->base.virt);
+
+	pci_release_regions(c->pdev);
+}
+
+/**
+ *	i2o_pci_alloc - Allocate DMA memory, map IO memory for I2O controller
+ *	@c: I2O controller
+ *
+ *	Allocate DMA memory for a PCI (or in theory AGP) I2O controller. All
+ *	IO mappings are also done here. If MTRR is enabled, also do add memory
+ *	regions here.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_pci_alloc(struct i2o_controller *c)
+{
+	struct pci_dev *pdev = c->pdev;
+	struct device *dev = &pdev->dev;
+	int i;
+
+	if (pci_request_regions(pdev, OSM_DESCRIPTION)) {
+		printk(KERN_ERR "%s: device already claimed\n", c->name);
+		return -ENODEV;
+	}
+
+	for (i = 0; i < 6; i++) {
+		/* Skip I/O spaces */
+		if (!(pci_resource_flags(pdev, i) & IORESOURCE_IO)) {
+			if (!c->base.phys) {
+				c->base.phys = pci_resource_start(pdev, i);
+				c->base.len = pci_resource_len(pdev, i);
+
+				/*
+				 * If we know what card it is, set the size
+				 * correctly. Code is taken from dpt_i2o.c
+				 */
+				if (pdev->device == 0xa501) {
+					if (pdev->subsystem_device >= 0xc032 &&
+					    pdev->subsystem_device <= 0xc03b) {
+						if (c->base.len > 0x400000)
+							c->base.len = 0x400000;
+					} else {
+						if (c->base.len > 0x100000)
+							c->base.len = 0x100000;
+					}
+				}
+				if (!c->raptor)
+					break;
+			} else {
+				c->in_queue.phys = pci_resource_start(pdev, i);
+				c->in_queue.len = pci_resource_len(pdev, i);
+				break;
+			}
+		}
+	}
+
+	if (i == 6) {
+		printk(KERN_ERR "%s: I2O controller has no memory regions"
+		       " defined.\n", c->name);
+		i2o_pci_free(c);
+		return -EINVAL;
+	}
+
+	/* Map the I2O controller */
+	if (c->raptor) {
+		printk(KERN_INFO "%s: PCI I2O controller\n", c->name);
+		printk(KERN_INFO "     BAR0 at 0x%08lX size=%ld\n",
+		       (unsigned long)c->base.phys, (unsigned long)c->base.len);
+		printk(KERN_INFO "     BAR1 at 0x%08lX size=%ld\n",
+		       (unsigned long)c->in_queue.phys,
+		       (unsigned long)c->in_queue.len);
+	} else
+		printk(KERN_INFO "%s: PCI I2O controller at %08lX size=%ld\n",
+		       c->name, (unsigned long)c->base.phys,
+		       (unsigned long)c->base.len);
+
+	c->base.virt = ioremap_nocache(c->base.phys, c->base.len);
+	if (!c->base.virt) {
+		printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	if (c->raptor) {
+		c->in_queue.virt =
+		    ioremap_nocache(c->in_queue.phys, c->in_queue.len);
+		if (!c->in_queue.virt) {
+			printk(KERN_ERR "%s: Unable to map controller.\n",
+			       c->name);
+			i2o_pci_free(c);
+			return -ENOMEM;
+		}
+	} else
+		c->in_queue = c->base;
+
+	c->irq_status = c->base.virt + I2O_IRQ_STATUS;
+	c->irq_mask = c->base.virt + I2O_IRQ_MASK;
+	c->in_port = c->base.virt + I2O_IN_PORT;
+	c->out_port = c->base.virt + I2O_OUT_PORT;
+
+	/* Motorola/Freescale chip does not follow spec */
+	if (pdev->vendor == PCI_VENDOR_ID_MOTOROLA && pdev->device == 0x18c0) {
+		/* Check if CPU is enabled */
+		if (be32_to_cpu(readl(c->base.virt + 0x10000)) & 0x10000000) {
+			printk(KERN_INFO "%s: MPC82XX needs CPU running to "
+			       "service I2O.\n", c->name);
+			i2o_pci_free(c);
+			return -ENODEV;
+		} else {
+			c->irq_status += I2O_MOTOROLA_PORT_OFFSET;
+			c->irq_mask += I2O_MOTOROLA_PORT_OFFSET;
+			c->in_port += I2O_MOTOROLA_PORT_OFFSET;
+			c->out_port += I2O_MOTOROLA_PORT_OFFSET;
+			printk(KERN_INFO "%s: MPC82XX workarounds activated.\n",
+			       c->name);
+		}
+	}
+
+	if (i2o_dma_alloc(dev, &c->status, 8)) {
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt))) {
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	if (i2o_dma_alloc(dev, &c->dlct, 8192)) {
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block))) {
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	if (i2o_dma_alloc(dev, &c->out_queue,
+		I2O_MAX_OUTBOUND_MSG_FRAMES * I2O_OUTBOUND_MSG_FRAME_SIZE *
+				sizeof(u32))) {
+		i2o_pci_free(c);
+		return -ENOMEM;
+	}
+
+	pci_set_drvdata(pdev, c);
+
+	return 0;
+}
+
+/**
+ *	i2o_pci_interrupt - Interrupt handler for I2O controller
+ *	@irq: interrupt line
+ *	@dev_id: pointer to the I2O controller
+ *
+ *	Handle an interrupt from a PCI based I2O controller. This turns out
+ *	to be rather simple. We keep the controller pointer in the cookie.
+ */
+static irqreturn_t i2o_pci_interrupt(int irq, void *dev_id)
+{
+	struct i2o_controller *c = dev_id;
+	u32 m;
+	irqreturn_t rc = IRQ_NONE;
+
+	while (readl(c->irq_status) & I2O_IRQ_OUTBOUND_POST) {
+		m = readl(c->out_port);
+		if (m == I2O_QUEUE_EMPTY) {
+			/*
+			 * Old 960 steppings had a bug in the I2O unit that
+			 * caused the queue to appear empty when it wasn't.
+			 */
+			m = readl(c->out_port);
+			if (unlikely(m == I2O_QUEUE_EMPTY))
+				break;
+		}
+
+		/* dispatch it */
+		if (i2o_driver_dispatch(c, m))
+			/* flush it if result != 0 */
+			i2o_flush_reply(c, m);
+
+		rc = IRQ_HANDLED;
+	}
+
+	return rc;
+}
+
+/**
+ *	i2o_pci_irq_enable - Allocate interrupt for I2O controller
+ *	@c: i2o_controller that the request is for
+ *
+ *	Allocate an interrupt for the I2O controller, and activate interrupts
+ *	on the I2O controller.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_pci_irq_enable(struct i2o_controller *c)
+{
+	struct pci_dev *pdev = c->pdev;
+	int rc;
+
+	writel(0xffffffff, c->irq_mask);
+
+	if (pdev->irq) {
+		rc = request_irq(pdev->irq, i2o_pci_interrupt, IRQF_SHARED,
+				 c->name, c);
+		if (rc < 0) {
+			printk(KERN_ERR "%s: unable to allocate interrupt %d."
+			       "\n", c->name, pdev->irq);
+			return rc;
+		}
+	}
+
+	writel(0x00000000, c->irq_mask);
+
+	printk(KERN_INFO "%s: Installed at IRQ %d\n", c->name, pdev->irq);
+
+	return 0;
+}
+
+/**
+ *	i2o_pci_irq_disable - Free interrupt for I2O controller
+ *	@c: I2O controller
+ *
+ *	Disable interrupts in I2O controller and then free interrupt.
+ */
+static void i2o_pci_irq_disable(struct i2o_controller *c)
+{
+	writel(0xffffffff, c->irq_mask);
+
+	if (c->pdev->irq > 0)
+		free_irq(c->pdev->irq, c);
+}
+
+/**
+ *	i2o_pci_probe - Probe the PCI device for an I2O controller
+ *	@pdev: PCI device to test
+ *	@id: id which matched with the PCI device id table
+ *
+ *	Probe the PCI device for any device which is a memory of the
+ *	Intelligent, I2O class or an Adaptec Zero Channel Controller. We
+ *	attempt to set up each such device and register it with the core.
+ *
+ *	Returns 0 on success or negative error code on failure.
+ */
+static int i2o_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+	struct i2o_controller *c;
+	int rc;
+	struct pci_dev *i960 = NULL;
+
+	printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");
+
+	if ((pdev->class & 0xff) > 1) {
+		printk(KERN_WARNING "i2o: %s does not support I2O 1.5 "
+		       "(skipping).\n", pci_name(pdev));
+		return -ENODEV;
+	}
+
+	if ((rc = pci_enable_device(pdev))) {
+		printk(KERN_WARNING "i2o: couldn't enable device %s\n",
+		       pci_name(pdev));
+		return rc;
+	}
+
+	if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32))) {
+		printk(KERN_WARNING "i2o: no suitable DMA found for %s\n",
+		       pci_name(pdev));
+		rc = -ENODEV;
+		goto disable;
+	}
+
+	pci_set_master(pdev);
+
+	c = i2o_iop_alloc();
+	if (IS_ERR(c)) {
+		printk(KERN_ERR "i2o: couldn't allocate memory for %s\n",
+		       pci_name(pdev));
+		rc = PTR_ERR(c);
+		goto disable;
+	} else
+		printk(KERN_INFO "%s: controller found (%s)\n", c->name,
+		       pci_name(pdev));
+
+	c->pdev = pdev;
+	c->device.parent = &pdev->dev;
+
+	/* Cards that fall apart if you hit them with large I/O loads... */
+	if (pdev->vendor == PCI_VENDOR_ID_NCR && pdev->device == 0x0630) {
+		c->short_req = 1;
+		printk(KERN_INFO "%s: Symbios FC920 workarounds activated.\n",
+		       c->name);
+	}
+
+	if (pdev->subsystem_vendor == PCI_VENDOR_ID_PROMISE) {
+		/*
+		 * Expose the ship behind i960 for initialization, or it will
+		 * failed
+		 */
+		i960 = pci_get_slot(c->pdev->bus,
+				  PCI_DEVFN(PCI_SLOT(c->pdev->devfn), 0));
+
+		if (i960) {
+			pci_write_config_word(i960, 0x42, 0);
+			pci_dev_put(i960);
+		}
+
+		c->promise = 1;
+		c->limit_sectors = 1;
+	}
+
+	if (pdev->subsystem_vendor == PCI_VENDOR_ID_DPT)
+		c->adaptec = 1;
+
+	/* Cards that go bananas if you quiesce them before you reset them. */
+	if (pdev->vendor == PCI_VENDOR_ID_DPT) {
+		c->no_quiesce = 1;
+		if (pdev->device == 0xa511)
+			c->raptor = 1;
+
+		if (pdev->subsystem_device == 0xc05a) {
+			c->limit_sectors = 1;
+			printk(KERN_INFO
+			       "%s: limit sectors per request to %d\n", c->name,
+			       I2O_MAX_SECTORS_LIMITED);
+		}
+#ifdef CONFIG_I2O_EXT_ADAPTEC_DMA64
+		if (sizeof(dma_addr_t) > 4) {
+			if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
+				printk(KERN_INFO "%s: 64-bit DMA unavailable\n",
+				       c->name);
+			else {
+				c->pae_support = 1;
+				printk(KERN_INFO "%s: using 64-bit DMA\n",
+				       c->name);
+			}
+		}
+#endif
+	}
+
+	if ((rc = i2o_pci_alloc(c))) {
+		printk(KERN_ERR "%s: DMA / IO allocation for I2O controller "
+		       "failed\n", c->name);
+		goto free_controller;
+	}
+
+	if (i2o_pci_irq_enable(c)) {
+		printk(KERN_ERR "%s: unable to enable interrupts for I2O "
+		       "controller\n", c->name);
+		goto free_pci;
+	}
+
+	if ((rc = i2o_iop_add(c)))
+		goto uninstall;
+
+	if (i960)
+		pci_write_config_word(i960, 0x42, 0x03ff);
+
+	return 0;
+
+      uninstall:
+	i2o_pci_irq_disable(c);
+
+      free_pci:
+	i2o_pci_free(c);
+
+      free_controller:
+	i2o_iop_free(c);
+
+      disable:
+	pci_disable_device(pdev);
+
+	return rc;
+}
+
+/**
+ *	i2o_pci_remove - Removes a I2O controller from the system
+ *	@pdev: I2O controller which should be removed
+ *
+ *	Reset the I2O controller, disable interrupts and remove all allocated
+ *	resources.
+ */
+static void i2o_pci_remove(struct pci_dev *pdev)
+{
+	struct i2o_controller *c;
+	c = pci_get_drvdata(pdev);
+
+	i2o_iop_remove(c);
+	i2o_pci_irq_disable(c);
+	i2o_pci_free(c);
+
+	pci_disable_device(pdev);
+
+	printk(KERN_INFO "%s: Controller removed.\n", c->name);
+
+	put_device(&c->device);
+};
+
+/* PCI driver for I2O controller */
+static struct pci_driver i2o_pci_driver = {
+	.name = "PCI_I2O",
+	.id_table = i2o_pci_ids,
+	.probe = i2o_pci_probe,
+	.remove = i2o_pci_remove,
+};
+
+/**
+ *	i2o_pci_init - registers I2O PCI driver in PCI subsystem
+ *
+ *	Returns > 0 on success or negative error code on failure.
+ */
+int __init i2o_pci_init(void)
+{
+	return pci_register_driver(&i2o_pci_driver);
+};
+
+/**
+ *	i2o_pci_exit - unregisters I2O PCI driver from PCI subsystem
+ */
+void __exit i2o_pci_exit(void)
+{
+	pci_unregister_driver(&i2o_pci_driver);
+};
+
+MODULE_DEVICE_TABLE(pci, i2o_pci_ids);