Logo Search packages:      
Sourcecode: linux version File versions

fsl_msi.c

/*
 * Copyright (C) 2007-2008 Freescale Semiconductor, Inc. All rights reserved.
 *
 * Author: Tony Li <tony.li@freescale.com>
 *       Jason Jin <Jason.jin@freescale.com>
 *
 * The hwirq alloc and free code reuse from sysdev/mpic_msi.c
 *
 * 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; version 2 of the
 * License.
 *
 */
#include <linux/irq.h>
#include <linux/bootmem.h>
#include <linux/msi.h>
#include <linux/pci.h>
#include <linux/of_platform.h>
#include <sysdev/fsl_soc.h>
#include <asm/prom.h>
#include <asm/hw_irq.h>
#include <asm/ppc-pci.h>
#include "fsl_msi.h"

struct fsl_msi_feature {
      u32 fsl_pic_ip;
      u32 msiir_offset;
};

static struct fsl_msi *fsl_msi;

static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
{
      return in_be32(base + (reg >> 2));
}

/*
 * We do not need this actually. The MSIR register has been read once
 * in the cascade interrupt. So, this MSI interrupt has been acked
*/
static void fsl_msi_end_irq(unsigned int virq)
{
}

static struct irq_chip fsl_msi_chip = {
      .mask       = mask_msi_irq,
      .unmask           = unmask_msi_irq,
      .ack        = fsl_msi_end_irq,
      .typename   = " FSL-MSI  ",
};

static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
                        irq_hw_number_t hw)
{
      struct irq_chip *chip = &fsl_msi_chip;

      get_irq_desc(virq)->status |= IRQ_TYPE_EDGE_FALLING;

      set_irq_chip_and_handler(virq, chip, handle_edge_irq);

      return 0;
}

static struct irq_host_ops fsl_msi_host_ops = {
      .map = fsl_msi_host_map,
};

static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
{
      int rc;

      rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS,
                        msi_data->irqhost->of_node);
      if (rc)
            return rc;

      rc = msi_bitmap_reserve_dt_hwirqs(&msi_data->bitmap);
      if (rc < 0) {
            msi_bitmap_free(&msi_data->bitmap);
            return rc;
      }

      return 0;
}

static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
{
      if (type == PCI_CAP_ID_MSIX)
            pr_debug("fslmsi: MSI-X untested, trying anyway.\n");

      return 0;
}

static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
{
      struct msi_desc *entry;
      struct fsl_msi *msi_data = fsl_msi;

      list_for_each_entry(entry, &pdev->msi_list, list) {
            if (entry->irq == NO_IRQ)
                  continue;
            set_irq_msi(entry->irq, NULL);
            msi_bitmap_free_hwirqs(&msi_data->bitmap,
                               virq_to_hw(entry->irq), 1);
            irq_dispose_mapping(entry->irq);
      }

      return;
}

static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
                          struct msi_msg *msg)
{
      struct fsl_msi *msi_data = fsl_msi;

      msg->address_lo = msi_data->msi_addr_lo;
      msg->address_hi = msi_data->msi_addr_hi;
      msg->data = hwirq;

      pr_debug("%s: allocated srs: %d, ibs: %d\n",
            __func__, hwirq / IRQS_PER_MSI_REG, hwirq % IRQS_PER_MSI_REG);
}

static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
      int rc, hwirq;
      unsigned int virq;
      struct msi_desc *entry;
      struct msi_msg msg;
      struct fsl_msi *msi_data = fsl_msi;

      list_for_each_entry(entry, &pdev->msi_list, list) {
            hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
            if (hwirq < 0) {
                  rc = hwirq;
                  pr_debug("%s: fail allocating msi interrupt\n",
                              __func__);
                  goto out_free;
            }

            virq = irq_create_mapping(msi_data->irqhost, hwirq);

            if (virq == NO_IRQ) {
                  pr_debug("%s: fail mapping hwirq 0x%x\n",
                              __func__, hwirq);
                  msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
                  rc = -ENOSPC;
                  goto out_free;
            }
            set_irq_msi(virq, entry);

            fsl_compose_msi_msg(pdev, hwirq, &msg);
            write_msi_msg(virq, &msg);
      }
      return 0;

out_free:
      return rc;
}

static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc)
{
      unsigned int cascade_irq;
      struct fsl_msi *msi_data = fsl_msi;
      int msir_index = -1;
      u32 msir_value = 0;
      u32 intr_index;
      u32 have_shift = 0;

      spin_lock(&desc->lock);
      if ((msi_data->feature &  FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) {
            if (desc->chip->mask_ack)
                  desc->chip->mask_ack(irq);
            else {
                  desc->chip->mask(irq);
                  desc->chip->ack(irq);
            }
      }

      if (unlikely(desc->status & IRQ_INPROGRESS))
            goto unlock;

      msir_index = (int)desc->handler_data;

      if (msir_index >= NR_MSI_REG)
            cascade_irq = NO_IRQ;

      desc->status |= IRQ_INPROGRESS;
      switch (fsl_msi->feature & FSL_PIC_IP_MASK) {
      case FSL_PIC_IP_MPIC:
            msir_value = fsl_msi_read(msi_data->msi_regs,
                  msir_index * 0x10);
            break;
      case FSL_PIC_IP_IPIC:
            msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
            break;
      }

      while (msir_value) {
            intr_index = ffs(msir_value) - 1;

            cascade_irq = irq_linear_revmap(msi_data->irqhost,
                        msir_index * IRQS_PER_MSI_REG +
                              intr_index + have_shift);
            if (cascade_irq != NO_IRQ)
                  generic_handle_irq(cascade_irq);
            have_shift += intr_index + 1;
            msir_value = msir_value >> (intr_index + 1);
      }
      desc->status &= ~IRQ_INPROGRESS;

      switch (msi_data->feature & FSL_PIC_IP_MASK) {
      case FSL_PIC_IP_MPIC:
            desc->chip->eoi(irq);
            break;
      case FSL_PIC_IP_IPIC:
            if (!(desc->status & IRQ_DISABLED) && desc->chip->unmask)
                  desc->chip->unmask(irq);
            break;
      }
unlock:
      spin_unlock(&desc->lock);
}

static int __devinit fsl_of_msi_probe(struct of_device *dev,
                        const struct of_device_id *match)
{
      struct fsl_msi *msi;
      struct resource res;
      int err, i, count;
      int rc;
      int virt_msir;
      const u32 *p;
      struct fsl_msi_feature *features = match->data;

      printk(KERN_DEBUG "Setting up Freescale MSI support\n");

      msi = kzalloc(sizeof(struct fsl_msi), GFP_KERNEL);
      if (!msi) {
            dev_err(&dev->dev, "No memory for MSI structure\n");
            err = -ENOMEM;
            goto error_out;
      }

      msi->irqhost = irq_alloc_host(dev->node, IRQ_HOST_MAP_LINEAR,
                              NR_MSI_IRQS, &fsl_msi_host_ops, 0);

      if (msi->irqhost == NULL) {
            dev_err(&dev->dev, "No memory for MSI irqhost\n");
            err = -ENOMEM;
            goto error_out;
      }

      /* Get the MSI reg base */
      err = of_address_to_resource(dev->node, 0, &res);
      if (err) {
            dev_err(&dev->dev, "%s resource error!\n",
                        dev->node->full_name);
            goto error_out;
      }

      msi->msi_regs = ioremap(res.start, res.end - res.start + 1);
      if (!msi->msi_regs) {
            dev_err(&dev->dev, "ioremap problem failed\n");
            goto error_out;
      }

      msi->feature = features->fsl_pic_ip;

      msi->irqhost->host_data = msi;

      msi->msi_addr_hi = 0x0;
      msi->msi_addr_lo = res.start + features->msiir_offset;

      rc = fsl_msi_init_allocator(msi);
      if (rc) {
            dev_err(&dev->dev, "Error allocating MSI bitmap\n");
            goto error_out;
      }

      p = of_get_property(dev->node, "interrupts", &count);
      if (!p) {
            dev_err(&dev->dev, "no interrupts property found on %s\n",
                        dev->node->full_name);
            err = -ENODEV;
            goto error_out;
      }
      if (count % 8 != 0) {
            dev_err(&dev->dev, "Malformed interrupts property on %s\n",
                        dev->node->full_name);
            err = -EINVAL;
            goto error_out;
      }

      count /= sizeof(u32);
      for (i = 0; i < count / 2; i++) {
            if (i > NR_MSI_REG)
                  break;
            virt_msir = irq_of_parse_and_map(dev->node, i);
            if (virt_msir != NO_IRQ) {
                  set_irq_data(virt_msir, (void *)i);
                  set_irq_chained_handler(virt_msir, fsl_msi_cascade);
            }
      }

      fsl_msi = msi;

      WARN_ON(ppc_md.setup_msi_irqs);
      ppc_md.setup_msi_irqs = fsl_setup_msi_irqs;
      ppc_md.teardown_msi_irqs = fsl_teardown_msi_irqs;
      ppc_md.msi_check_device = fsl_msi_check_device;
      return 0;
error_out:
      kfree(msi);
      return err;
}

static const struct fsl_msi_feature mpic_msi_feature = {
      .fsl_pic_ip = FSL_PIC_IP_MPIC,
      .msiir_offset = 0x140,
};

static const struct fsl_msi_feature ipic_msi_feature = {
      .fsl_pic_ip = FSL_PIC_IP_IPIC,
      .msiir_offset = 0x38,
};

static const struct of_device_id fsl_of_msi_ids[] = {
      {
            .compatible = "fsl,mpic-msi",
            .data = (void *)&mpic_msi_feature,
      },
      {
            .compatible = "fsl,ipic-msi",
            .data = (void *)&ipic_msi_feature,
      },
      {}
};

static struct of_platform_driver fsl_of_msi_driver = {
      .name = "fsl-msi",
      .match_table = fsl_of_msi_ids,
      .probe = fsl_of_msi_probe,
};

static __init int fsl_of_msi_init(void)
{
      return of_register_platform_driver(&fsl_of_msi_driver);
}

subsys_initcall(fsl_of_msi_init);

Generated by  Doxygen 1.6.0   Back to index