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path: root/drivers/staging/i2o/pci.c
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Diffstat (limited to 'drivers/staging/i2o/pci.c')
-rw-r--r--drivers/staging/i2o/pci.c497
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);
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