[TG3]: Set minimal hw interrupt mitigation.

[linux-2.6/verdex.git] / drivers / message / i2o / pci.c

/*
 *      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@redhat.com>:
 *                      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/i2o.h>

#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif                          // CONFIG_MTRR

/* Module internal functions from other sources */
extern struct i2o_controller *i2o_iop_alloc(void);
extern void i2o_iop_free(struct i2o_controller *);

extern int i2o_iop_add(struct i2o_controller *);
extern void i2o_iop_remove(struct i2o_controller *);

extern int i2o_driver_dispatch(struct i2o_controller *, u32,
                               struct i2o_message *);

/* PCI device id table for all I2O controllers */
static struct pci_device_id __devinitdata i2o_pci_ids[] = {
        {PCI_DEVICE_CLASS(PCI_CLASS_INTELLIGENT_I2O << 8, 0xffff00)},
        {PCI_DEVICE(PCI_VENDOR_ID_DPT, 0xa511)},
        {0}
};

/**
 *      i2o_dma_realloc - Realloc DMA memory
 *      @dev: struct device pointer to the PCI device of the I2O controller
 *      @addr: pointer to a i2o_dma struct DMA buffer
 *      @len: new length of memory
 *      @gfp_mask: GFP mask
 *
 *      If there was something allocated in the addr, free it first. If len > 0
 *      than try to allocate it and write the addresses back to the addr
 *      structure. If len == 0 set the virtual address to NULL.
 *
 *      Returns the 0 on success or negative error code on failure.
 */
int i2o_dma_realloc(struct device *dev, struct i2o_dma *addr, size_t len,
                    unsigned int gfp_mask)
{
        i2o_dma_free(dev, addr);

        if (len)
                return i2o_dma_alloc(dev, addr, len, gfp_mask);

        return 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);
        if (c->lct)
                kfree(c->lct);
        i2o_dma_free(dev, &c->dlct);
        i2o_dma_free(dev, &c->hrt);
        i2o_dma_free(dev, &c->status);

#ifdef CONFIG_MTRR
        if (c->mtrr_reg0 >= 0)
                mtrr_del(c->mtrr_reg0, 0, 0);
        if (c->mtrr_reg1 >= 0)
                mtrr_del(c->mtrr_reg1, 0, 0);
#endif

        if (c->raptor && c->in_queue.virt)
                iounmap(c->in_queue.virt);

        if (c->base.virt)
                iounmap(c->base.virt);
}

/**
 *      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 __devinit i2o_pci_alloc(struct i2o_controller *c)
{
        struct pci_dev *pdev = c->pdev;
        struct device *dev = &pdev->dev;
        int i;

        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(c->base.phys, c->base.len);
        if (!c->base.virt) {
                printk(KERN_ERR "%s: Unable to map controller.\n", c->name);
                return -ENOMEM;
        }

        if (c->raptor) {
                c->in_queue.virt = ioremap(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_mask = c->base.virt + 0x34;
        c->post_port = c->base.virt + 0x40;
        c->reply_port = c->base.virt + 0x44;

#ifdef CONFIG_MTRR
        /* Enable Write Combining MTRR for IOP's memory region */
        c->mtrr_reg0 = mtrr_add(c->in_queue.phys, c->in_queue.len,
                                MTRR_TYPE_WRCOMB, 1);
        c->mtrr_reg1 = -1;

        if (c->mtrr_reg0 < 0)
                printk(KERN_WARNING "%s: could not enable write combining "
                       "MTRR\n", c->name);
        else
                printk(KERN_INFO "%s: using write combining MTRR\n", c->name);

        /*
         * If it is an INTEL i960 I/O processor then set the first 64K to
         * Uncacheable since the region contains the messaging unit which
         * shouldn't be cached.
         */
        if ((pdev->vendor == PCI_VENDOR_ID_INTEL ||
             pdev->vendor == PCI_VENDOR_ID_DPT) && !c->raptor) {
                printk(KERN_INFO "%s: MTRR workaround for Intel i960 processor"
                       "\n", c->name);
                c->mtrr_reg1 = mtrr_add(c->base.phys, 0x10000,
                                        MTRR_TYPE_UNCACHABLE, 1);

                if (c->mtrr_reg1 < 0) {
                        printk(KERN_WARNING "%s: Error in setting "
                               "MTRR_TYPE_UNCACHABLE\n", c->name);
                        mtrr_del(c->mtrr_reg0, c->in_queue.phys,
                                 c->in_queue.len);
                        c->mtrr_reg0 = -1;
                }
        }
#endif

        if (i2o_dma_alloc(dev, &c->status, 8, GFP_KERNEL)) {
                i2o_pci_free(c);
                return -ENOMEM;
        }

        if (i2o_dma_alloc(dev, &c->hrt, sizeof(i2o_hrt), GFP_KERNEL)) {
                i2o_pci_free(c);
                return -ENOMEM;
        }

        if (i2o_dma_alloc(dev, &c->dlct, 8192, GFP_KERNEL)) {
                i2o_pci_free(c);
                return -ENOMEM;
        }

        if (i2o_dma_alloc(dev, &c->status_block, sizeof(i2o_status_block),
                          GFP_KERNEL)) {
                i2o_pci_free(c);
                return -ENOMEM;
        }

        if (i2o_dma_alloc(dev, &c->out_queue, MSG_POOL_SIZE, GFP_KERNEL)) {
                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
 *      @r: pointer to registers
 *
 *      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 pt_regs *r)
{
        struct i2o_controller *c = dev_id;
        struct device *dev = &c->pdev->dev;
        struct i2o_message *m;
        u32 mv;

        /*
         * Old 960 steppings had a bug in the I2O unit that caused
         * the queue to appear empty when it wasn't.
         */
        mv = I2O_REPLY_READ32(c);
        if (mv == I2O_QUEUE_EMPTY) {
                mv = I2O_REPLY_READ32(c);
                if (unlikely(mv == I2O_QUEUE_EMPTY)) {
                        return IRQ_NONE;
                } else
                        pr_debug("%s: 960 bug detected\n", c->name);
        }

        while (mv != I2O_QUEUE_EMPTY) {
                /*
                 * Map the message from the page frame map to kernel virtual.
                 * Because bus_to_virt is deprecated, we have calculate the
                 * location by ourself!
                 */
                m = i2o_msg_out_to_virt(c, mv);

                /*
                 *      Ensure this message is seen coherently but cachably by
                 *      the processor
                 */
                dma_sync_single_for_cpu(dev, mv, MSG_FRAME_SIZE * 4,
                                        PCI_DMA_FROMDEVICE);

                /* dispatch it */
                if (i2o_driver_dispatch(c, mv, m))
                        /* flush it if result != 0 */
                        i2o_flush_reply(c, mv);

                /*
                 * That 960 bug again...
                 */
                mv = I2O_REPLY_READ32(c);
                if (mv == I2O_QUEUE_EMPTY)
                        mv = I2O_REPLY_READ32(c);
        }
        return IRQ_HANDLED;
}

/**
 *      i2o_pci_irq_enable - Allocate interrupt for I2O controller
 *
 *      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;

        I2O_IRQ_WRITE32(c, 0xffffffff);

        if (pdev->irq) {
                rc = request_irq(pdev->irq, i2o_pci_interrupt, SA_SHIRQ,
                                 c->name, c);
                if (rc < 0) {
                        printk(KERN_ERR "%s: unable to allocate interrupt %d."
                               "\n", c->name, pdev->irq);
                        return rc;
                }
        }

        I2O_IRQ_WRITE32(c, 0x00000000);

        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)
{
        I2O_IRQ_WRITE32(c, 0xffffffff);

        if (c->pdev->irq > 0)
                free_irq(c->pdev->irq, c);
}

/**
 *      i2o_pci_probe - Probe the PCI device for an I2O controller
 *      @dev: 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 __devinit i2o_pci_probe(struct pci_dev *pdev,
                                   const struct pci_device_id *id)
{
        struct i2o_controller *c;
        int rc;

        printk(KERN_INFO "i2o: Checking for PCI I2O controllers...\n");

        if ((pdev->class & 0xff) > 1) {
                printk(KERN_WARNING "i2o: I2O controller found but does not "
                       "support I2O 1.5 (skipping).\n");
                return -ENODEV;
        }

        if ((rc = pci_enable_device(pdev))) {
                printk(KERN_WARNING "i2o: I2O controller found but could not be"
                       " enabled.\n");
                return rc;
        }

        printk(KERN_INFO "i2o: I2O controller found on bus %d at %d.\n",
               pdev->bus->number, pdev->devfn);

        if (pci_set_dma_mask(pdev, DMA_32BIT_MASK)) {
                printk(KERN_WARNING "i2o: I2O controller on bus %d at %d: No "
                       "suitable DMA available!\n", pdev->bus->number,
                       pdev->devfn);
                rc = -ENODEV;
                goto disable;
        }

        pci_set_master(pdev);

        c = i2o_iop_alloc();
        if (IS_ERR(c)) {
                printk(KERN_ERR "i2o: memory for I2O controller could not be "
                       "allocated\n");
                rc = PTR_ERR(c);
                goto disable;
        }

        c->pdev = pdev;
        c->device = 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) {
                c->promise = 1;
                printk(KERN_INFO "%s: Promise workarounds activated.\n",
                       c->name);
        }

        /* 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 ((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;

        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 __devexit 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);

        printk(KERN_INFO "%s: Controller removed.\n", c->name);

        i2o_iop_free(c);
        pci_disable_device(pdev);
};

/* PCI driver for I2O controller */
static struct pci_driver i2o_pci_driver = {
        .name = "I2O controller",
        .id_table = i2o_pci_ids,
        .probe = i2o_pci_probe,
        .remove = __devexit_p(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);
};

EXPORT_SYMBOL(i2o_dma_realloc);
MODULE_DEVICE_TABLE(pci, i2o_pci_ids);