1 files changed, 93 insertions, 24 deletions

diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c
index a7be144f5874..962c2d8dd8d9 100644
--- a/arch/powerpc/sysdev/fsl_msi.c
+++ b/arch/powerpc/sysdev/fsl_msi.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2007-2008 Freescale Semiconductor, Inc. All rights reserved.
+ * Copyright (C) 2007-2010 Freescale Semiconductor, Inc.
  *
  * Author: Tony Li <tony.li@freescale.com>
  *         Jason Jin <Jason.jin@freescale.com>
@@ -22,14 +22,20 @@
 #include <asm/prom.h>
 #include <asm/hw_irq.h>
 #include <asm/ppc-pci.h>
+#include <asm/mpic.h>
 #include "fsl_msi.h"
 
+LIST_HEAD(msi_head);
+
 struct fsl_msi_feature {
         u32 fsl_pic_ip;
         u32 msiir_offset;
 };
 
-static struct fsl_msi *fsl_msi;
+struct fsl_msi_cascade_data {
+        struct fsl_msi *msi_data;
+        int index;
+};
 
 static inline u32 fsl_msi_read(u32 __iomem *base, unsigned int reg)
 {
@@ -54,10 +60,12 @@ static struct irq_chip fsl_msi_chip = {
 static int fsl_msi_host_map(struct irq_host *h, unsigned int virq,
                                 irq_hw_number_t hw)
 {
+        struct fsl_msi *msi_data = h->host_data;
         struct irq_chip *chip = &fsl_msi_chip;
 
         irq_to_desc(virq)->status |= IRQ_TYPE_EDGE_FALLING;
 
+        set_irq_chip_data(virq, msi_data);
         set_irq_chip_and_handler(virq, chip, handle_edge_irq);
 
         return 0;
@@ -96,11 +104,12 @@ static int fsl_msi_check_device(struct pci_dev *pdev, int nvec, int type)
 static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
 {
         struct msi_desc *entry;
-        struct fsl_msi *msi_data = fsl_msi;
+        struct fsl_msi *msi_data;
 
         list_for_each_entry(entry, &pdev->msi_list, list) {
                 if (entry->irq == NO_IRQ)
                         continue;
+                msi_data = get_irq_data(entry->irq);
                 set_irq_msi(entry->irq, NULL);
                 msi_bitmap_free_hwirqs(&msi_data->bitmap,
                                        virq_to_hw(entry->irq), 1);
@@ -111,9 +120,10 @@ static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
 }
 
 static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
-                                  struct msi_msg *msg)
+                                struct msi_msg *msg,
+                                struct fsl_msi *fsl_msi_data)
 {
-        struct fsl_msi *msi_data = fsl_msi;
+        struct fsl_msi *msi_data = fsl_msi_data;
         struct pci_controller *hose = pci_bus_to_host(pdev->bus);
         u32 base = 0;
 
@@ -130,14 +140,19 @@ static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
 
 static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
 {
-        int rc, hwirq;
+        int rc, hwirq = -ENOMEM;
         unsigned int virq;
         struct msi_desc *entry;
         struct msi_msg msg;
-        struct fsl_msi *msi_data = fsl_msi;
+        struct fsl_msi *msi_data;
 
         list_for_each_entry(entry, &pdev->msi_list, list) {
-                hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
+                list_for_each_entry(msi_data, &msi_head, list) {
+                        hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
+                        if (hwirq >= 0)
+                                break;
+                }
+
                 if (hwirq < 0) {
                         rc = hwirq;
                         pr_debug("%s: fail allocating msi interrupt\n",
@@ -154,25 +169,31 @@ static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
                         rc = -ENOSPC;
                         goto out_free;
                 }
+                set_irq_data(virq, msi_data);
                 set_irq_msi(virq, entry);
 
-                fsl_compose_msi_msg(pdev, hwirq, &msg);
+                fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
                 write_msi_msg(virq, &msg);
         }
         return 0;
 
 out_free:
+        /* free by the caller of this function */
         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;
+        struct fsl_msi *msi_data;
         int msir_index = -1;
         u32 msir_value = 0;
         u32 intr_index;
         u32 have_shift = 0;
+        struct fsl_msi_cascade_data *cascade_data;
+
+        cascade_data = (struct fsl_msi_cascade_data *)get_irq_data(irq);
+        msi_data = cascade_data->msi_data;
 
         raw_spin_lock(&desc->lock);
         if ((msi_data->feature &  FSL_PIC_IP_MASK) == FSL_PIC_IP_IPIC) {
@@ -187,13 +208,13 @@ static void fsl_msi_cascade(unsigned int irq, struct irq_desc *desc)
         if (unlikely(desc->status & IRQ_INPROGRESS))
                 goto unlock;
 
-        msir_index = (int)desc->handler_data;
+        msir_index = cascade_data->index;
 
         if (msir_index >= NR_MSI_REG)
                 cascade_irq = NO_IRQ;
 
         desc->status |= IRQ_INPROGRESS;
-        switch (fsl_msi->feature & FSL_PIC_IP_MASK) {
+        switch (msi_data->feature & FSL_PIC_IP_MASK) {
         case FSL_PIC_IP_MPIC:
                 msir_value = fsl_msi_read(msi_data->msi_regs,
                         msir_index * 0x10);
@@ -229,6 +250,30 @@ unlock:
         raw_spin_unlock(&desc->lock);
 }
 
+static int fsl_of_msi_remove(struct of_device *ofdev)
+{
+        struct fsl_msi *msi = ofdev->dev.platform_data;
+        int virq, i;
+        struct fsl_msi_cascade_data *cascade_data;
+
+        if (msi->list.prev != NULL)
+                list_del(&msi->list);
+        for (i = 0; i < NR_MSI_REG; i++) {
+                virq = msi->msi_virqs[i];
+                if (virq != NO_IRQ) {
+                        cascade_data = get_irq_data(virq);
+                        kfree(cascade_data);
+                        irq_dispose_mapping(virq);
+                }
+        }
+        if (msi->bitmap.bitmap)
+                msi_bitmap_free(&msi->bitmap);
+        iounmap(msi->msi_regs);
+        kfree(msi);
+
+        return 0;
+}
+
 static int __devinit fsl_of_msi_probe(struct of_device *dev,
                                 const struct of_device_id *match)
 {
@@ -239,15 +284,18 @@ static int __devinit fsl_of_msi_probe(struct of_device *dev,
         int virt_msir;
         const u32 *p;
         struct fsl_msi_feature *features = match->data;
+        struct fsl_msi_cascade_data *cascade_data = NULL;
+        int len;
+        u32 offset;
 
         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;
+                return -ENOMEM;
         }
+        dev->dev.platform_data = msi;
 
         msi->irqhost = irq_alloc_host(dev->dev.of_node, IRQ_HOST_MAP_LINEAR,
                                       NR_MSI_IRQS, &fsl_msi_host_ops, 0);
@@ -298,27 +346,47 @@ static int __devinit fsl_of_msi_probe(struct of_device *dev,
                 err = -EINVAL;
                 goto error_out;
         }
+        offset = 0;
+        p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
+        if (p)
+                offset = *p / IRQS_PER_MSI_REG;
 
         count /= sizeof(u32);
-        for (i = 0; i < count / 2; i++) {
-                if (i > NR_MSI_REG)
-                        break;
+        for (i = 0; i < min(count / 2, NR_MSI_REG); i++) {
                 virt_msir = irq_of_parse_and_map(dev->dev.of_node, i);
                 if (virt_msir != NO_IRQ) {
-                        set_irq_data(virt_msir, (void *)i);
+                        cascade_data = kzalloc(
+                                        sizeof(struct fsl_msi_cascade_data),
+                                        GFP_KERNEL);
+                        if (!cascade_data) {
+                                dev_err(&dev->dev,
+                                        "No memory for MSI cascade data\n");
+                                err = -ENOMEM;
+                                goto error_out;
+                        }
+                        msi->msi_virqs[i] = virt_msir;
+                        cascade_data->index = i + offset;
+                        cascade_data->msi_data = msi;
+                        set_irq_data(virt_msir, (void *)cascade_data);
                         set_irq_chained_handler(virt_msir, fsl_msi_cascade);
                 }
         }
 
-        fsl_msi = msi;
+        list_add_tail(&msi->list, &msi_head);
 
-        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;
+        /* The multiple setting ppc_md.setup_msi_irqs will not harm things */
+        if (!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;
+        } else if (ppc_md.setup_msi_irqs != fsl_setup_msi_irqs) {
+                dev_err(&dev->dev, "Different MSI driver already installed!\n");
+                err = -ENODEV;
+                goto error_out;
+        }
         return 0;
 error_out:
-        kfree(msi);
+        fsl_of_msi_remove(dev);
         return err;
 }
 
@@ -351,6 +419,7 @@ static struct of_platform_driver fsl_of_msi_driver = {
                 .of_match_table = fsl_of_msi_ids,
         },
         .probe = fsl_of_msi_probe,
+        .remove = fsl_of_msi_remove,
 };
 
 static __init int fsl_of_msi_init(void)