--- /dev/null
+/*
+ * 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/bitmap.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));
+}
+
+static inline void fsl_msi_write(u32 __iomem *base,
+ unsigned int reg, u32 value)
+{
+ out_be32(base + (reg >> 2), value);
+}
+
+/*
+ * 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,
+};
+
+irq_hw_number_t fsl_msi_alloc_hwirqs(struct fsl_msi *msi, int num)
+{
+ unsigned long flags;
+ int offset, order = get_count_order(num);
+
+ spin_lock_irqsave(&msi->bitmap_lock, flags);
+
+ offset = bitmap_find_free_region(msi->fsl_msi_bitmap,
+ NR_MSI_IRQS, order);
+
+ spin_unlock_irqrestore(&msi->bitmap_lock, flags);
+
+ pr_debug("%s: allocated 0x%x (2^%d) at offset 0x%x\n",
+ __func__, num, order, offset);
+
+ return offset;
+}
+
+void fsl_msi_free_hwirqs(struct fsl_msi *msi, int offset, int num)
+{
+ unsigned long flags;
+ int order = get_count_order(num);
+
+ pr_debug("%s: freeing 0x%x (2^%d) at offset 0x%x\n",
+ __func__, num, order, offset);
+
+ spin_lock_irqsave(&msi->bitmap_lock, flags);
+ bitmap_release_region(msi->fsl_msi_bitmap, offset, order);
+ spin_unlock_irqrestore(&msi->bitmap_lock, flags);
+}
+
+static int fsl_msi_free_dt_hwirqs(struct fsl_msi *msi)
+{
+ int i, len;
+ const u32 *p;
+
+ bitmap_allocate_region(msi->fsl_msi_bitmap, 0,
+ get_count_order(NR_MSI_IRQS));
+
+ p = of_get_property(msi->of_node, "msi-available-ranges", &len);
+
+ if (!p) {
+ /* No msi-available-ranges property,
+ * All the 256 MSI interrupts can be used
+ */
+ fsl_msi_free_hwirqs(msi, 0, 0x100);
+ return 0;
+ }
+
+ if ((len % (2 * sizeof(u32))) != 0) {
+ printk(KERN_WARNING "fsl_msi: Malformed msi-available-ranges "
+ "property on %s\n", msi->of_node->full_name);
+ return -EINVAL;
+ }
+
+ /* Format is: (<u32 start> <u32 count>)+ */
+ len /= 2 * sizeof(u32);
+ for (i = 0; i < len; i++, p += 2)
+ fsl_msi_free_hwirqs(msi, *p, *(p + 1));
+
+ return 0;
+}
+
+static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
+{
+ int rc, size;
+
+ size = BITS_TO_LONGS(NR_MSI_IRQS) * sizeof(u32);
+
+ msi_data->fsl_msi_bitmap = kzalloc(size, GFP_KERNEL);
+
+ if (msi_data->fsl_msi_bitmap == NULL) {
+ pr_debug("%s: ENOMEM allocating allocator bitmap!\n",
+ __func__);
+ return -ENOMEM;
+ }
+
+ rc = fsl_msi_free_dt_hwirqs(msi_data);
+ if (rc)
+ goto out_free;
+
+ return 0;
+out_free:
+ kfree(msi_data->fsl_msi_bitmap);
+
+ msi_data->fsl_msi_bitmap = NULL;
+ return rc;
+
+}
+
+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);
+ fsl_msi_free_hwirqs(msi_data, 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)
+{
+ irq_hw_number_t hwirq;
+ int rc;
+ 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 = fsl_msi_alloc_hwirqs(msi_data, 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%lx\n",
+ __func__, hwirq);
+ fsl_msi_free_hwirqs(msi_data, 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;
+}
+
+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 *tmp_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->of_node = of_node_get(dev->node);
+
+ msi->irqhost = irq_alloc_host(of_node_get(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");
+ of_node_put(dev->node);
+ 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;
+ }
+
+ tmp_data = (struct fsl_msi_feature *)match->data;
+
+ msi->feature = tmp_data->fsl_pic_ip;
+
+ msi->irqhost->host_data = msi;
+
+ msi->msi_addr_hi = 0x0;
+ msi->msi_addr_lo = res.start + tmp_data->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);
projects / linux-2.6 / commitdiff