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-rw-r--r--arch/powerpc/sysdev/fsl_msi.c616
1 files changed, 616 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_msi.c b/arch/powerpc/sysdev/fsl_msi.c
new file mode 100644
index 000000000..57978a44d
--- /dev/null
+++ b/arch/powerpc/sysdev/fsl_msi.c
@@ -0,0 +1,616 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2007-2011 Freescale Semiconductor, Inc.
+ *
+ * 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
+ */
+#include <linux/irq.h>
+#include <linux/msi.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <linux/seq_file.h>
+#include <sysdev/fsl_soc.h>
+#include <asm/hw_irq.h>
+#include <asm/ppc-pci.h>
+#include <asm/mpic.h>
+#include <asm/fsl_hcalls.h>
+
+#include "fsl_msi.h"
+#include "fsl_pci.h"
+
+#define MSIIR_OFFSET_MASK 0xfffff
+#define MSIIR_IBS_SHIFT 0
+#define MSIIR_SRS_SHIFT 5
+#define MSIIR1_IBS_SHIFT 4
+#define MSIIR1_SRS_SHIFT 0
+#define MSI_SRS_MASK 0xf
+#define MSI_IBS_MASK 0x1f
+
+#define msi_hwirq(msi, msir_index, intr_index) \
+ ((msir_index) << (msi)->srs_shift | \
+ ((intr_index) << (msi)->ibs_shift))
+
+static LIST_HEAD(msi_head);
+
+struct fsl_msi_feature {
+ u32 fsl_pic_ip;
+ u32 msiir_offset; /* Offset of MSIIR, relative to start of MSIR bank */
+};
+
+struct fsl_msi_cascade_data {
+ struct fsl_msi *msi_data;
+ int index;
+ int virq;
+};
+
+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(struct irq_data *d)
+{
+}
+
+static void fsl_msi_print_chip(struct irq_data *irqd, struct seq_file *p)
+{
+ struct fsl_msi *msi_data = irqd->domain->host_data;
+ irq_hw_number_t hwirq = irqd_to_hwirq(irqd);
+ int cascade_virq, srs;
+
+ srs = (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK;
+ cascade_virq = msi_data->cascade_array[srs]->virq;
+
+ seq_printf(p, " fsl-msi-%d", cascade_virq);
+}
+
+
+static struct irq_chip fsl_msi_chip = {
+ .irq_mask = pci_msi_mask_irq,
+ .irq_unmask = pci_msi_unmask_irq,
+ .irq_ack = fsl_msi_end_irq,
+ .irq_print_chip = fsl_msi_print_chip,
+};
+
+static int fsl_msi_host_map(struct irq_domain *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_set_status_flags(virq, IRQ_TYPE_EDGE_FALLING);
+
+ irq_set_chip_data(virq, msi_data);
+ irq_set_chip_and_handler(virq, chip, handle_edge_irq);
+
+ return 0;
+}
+
+static const struct irq_domain_ops fsl_msi_host_ops = {
+ .map = fsl_msi_host_map,
+};
+
+static int fsl_msi_init_allocator(struct fsl_msi *msi_data)
+{
+ int rc, hwirq;
+
+ rc = msi_bitmap_alloc(&msi_data->bitmap, NR_MSI_IRQS_MAX,
+ irq_domain_get_of_node(msi_data->irqhost));
+ if (rc)
+ return rc;
+
+ /*
+ * Reserve all the hwirqs
+ * The available hwirqs will be released in fsl_msi_setup_hwirq()
+ */
+ for (hwirq = 0; hwirq < NR_MSI_IRQS_MAX; hwirq++)
+ msi_bitmap_reserve_hwirq(&msi_data->bitmap, hwirq);
+
+ return 0;
+}
+
+static void fsl_teardown_msi_irqs(struct pci_dev *pdev)
+{
+ struct msi_desc *entry;
+ struct fsl_msi *msi_data;
+ irq_hw_number_t hwirq;
+
+ msi_for_each_desc(entry, &pdev->dev, MSI_DESC_ASSOCIATED) {
+ hwirq = virq_to_hw(entry->irq);
+ msi_data = irq_get_chip_data(entry->irq);
+ irq_set_msi_desc(entry->irq, NULL);
+ irq_dispose_mapping(entry->irq);
+ entry->irq = 0;
+ msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
+ }
+}
+
+static void fsl_compose_msi_msg(struct pci_dev *pdev, int hwirq,
+ struct msi_msg *msg,
+ struct fsl_msi *fsl_msi_data)
+{
+ struct fsl_msi *msi_data = fsl_msi_data;
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ u64 address; /* Physical address of the MSIIR */
+ int len;
+ const __be64 *reg;
+
+ /* If the msi-address-64 property exists, then use it */
+ reg = of_get_property(hose->dn, "msi-address-64", &len);
+ if (reg && (len == sizeof(u64)))
+ address = be64_to_cpup(reg);
+ else
+ address = fsl_pci_immrbar_base(hose) + msi_data->msiir_offset;
+
+ msg->address_lo = lower_32_bits(address);
+ msg->address_hi = upper_32_bits(address);
+
+ /*
+ * MPIC version 2.0 has erratum PIC1. It causes
+ * that neither MSI nor MSI-X can work fine.
+ * This is a workaround to allow MSI-X to function
+ * properly. It only works for MSI-X, we prevent
+ * MSI on buggy chips in fsl_setup_msi_irqs().
+ */
+ if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
+ msg->data = __swab32(hwirq);
+ else
+ msg->data = hwirq;
+
+ pr_debug("%s: allocated srs: %d, ibs: %d\n", __func__,
+ (hwirq >> msi_data->srs_shift) & MSI_SRS_MASK,
+ (hwirq >> msi_data->ibs_shift) & MSI_IBS_MASK);
+}
+
+static int fsl_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
+{
+ struct pci_controller *hose = pci_bus_to_host(pdev->bus);
+ struct device_node *np;
+ phandle phandle = 0;
+ int rc, hwirq = -ENOMEM;
+ unsigned int virq;
+ struct msi_desc *entry;
+ struct msi_msg msg;
+ struct fsl_msi *msi_data;
+
+ if (type == PCI_CAP_ID_MSI) {
+ /*
+ * MPIC version 2.0 has erratum PIC1. For now MSI
+ * could not work. So check to prevent MSI from
+ * being used on the board with this erratum.
+ */
+ list_for_each_entry(msi_data, &msi_head, list)
+ if (msi_data->feature & MSI_HW_ERRATA_ENDIAN)
+ return -EINVAL;
+ }
+
+ /*
+ * If the PCI node has an fsl,msi property, then we need to use it
+ * to find the specific MSI.
+ */
+ np = of_parse_phandle(hose->dn, "fsl,msi", 0);
+ if (np) {
+ if (of_device_is_compatible(np, "fsl,mpic-msi") ||
+ of_device_is_compatible(np, "fsl,vmpic-msi") ||
+ of_device_is_compatible(np, "fsl,vmpic-msi-v4.3"))
+ phandle = np->phandle;
+ else {
+ dev_err(&pdev->dev,
+ "node %pOF has an invalid fsl,msi phandle %u\n",
+ hose->dn, np->phandle);
+ of_node_put(np);
+ return -EINVAL;
+ }
+ of_node_put(np);
+ }
+
+ msi_for_each_desc(entry, &pdev->dev, MSI_DESC_NOTASSOCIATED) {
+ /*
+ * Loop over all the MSI devices until we find one that has an
+ * available interrupt.
+ */
+ list_for_each_entry(msi_data, &msi_head, list) {
+ /*
+ * If the PCI node has an fsl,msi property, then we
+ * restrict our search to the corresponding MSI node.
+ * The simplest way is to skip over MSI nodes with the
+ * wrong phandle. Under the Freescale hypervisor, this
+ * has the additional benefit of skipping over MSI
+ * nodes that are not mapped in the PAMU.
+ */
+ if (phandle && (phandle != msi_data->phandle))
+ continue;
+
+ hwirq = msi_bitmap_alloc_hwirqs(&msi_data->bitmap, 1);
+ if (hwirq >= 0)
+ break;
+ }
+
+ if (hwirq < 0) {
+ rc = hwirq;
+ dev_err(&pdev->dev, "could not allocate MSI interrupt\n");
+ goto out_free;
+ }
+
+ virq = irq_create_mapping(msi_data->irqhost, hwirq);
+
+ if (!virq) {
+ dev_err(&pdev->dev, "fail mapping hwirq %i\n", hwirq);
+ msi_bitmap_free_hwirqs(&msi_data->bitmap, hwirq, 1);
+ rc = -ENOSPC;
+ goto out_free;
+ }
+ /* chip_data is msi_data via host->hostdata in host->map() */
+ irq_set_msi_desc(virq, entry);
+
+ fsl_compose_msi_msg(pdev, hwirq, &msg, msi_data);
+ pci_write_msi_msg(virq, &msg);
+ }
+ return 0;
+
+out_free:
+ /* free by the caller of this function */
+ return rc;
+}
+
+static irqreturn_t fsl_msi_cascade(int irq, void *data)
+{
+ 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 = data;
+ irqreturn_t ret = IRQ_NONE;
+
+ msi_data = cascade_data->msi_data;
+
+ msir_index = cascade_data->index;
+
+ 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);
+ break;
+ case FSL_PIC_IP_IPIC:
+ msir_value = fsl_msi_read(msi_data->msi_regs, msir_index * 0x4);
+ break;
+#ifdef CONFIG_EPAPR_PARAVIRT
+ case FSL_PIC_IP_VMPIC: {
+ unsigned int ret;
+ ret = fh_vmpic_get_msir(virq_to_hw(irq), &msir_value);
+ if (ret) {
+ pr_err("fsl-msi: fh_vmpic_get_msir() failed for "
+ "irq %u (ret=%u)\n", irq, ret);
+ msir_value = 0;
+ }
+ break;
+ }
+#endif
+ }
+
+ while (msir_value) {
+ int err;
+ intr_index = ffs(msir_value) - 1;
+
+ err = generic_handle_domain_irq(msi_data->irqhost,
+ msi_hwirq(msi_data, msir_index,
+ intr_index + have_shift));
+ if (!err)
+ ret = IRQ_HANDLED;
+
+ have_shift += intr_index + 1;
+ msir_value = msir_value >> (intr_index + 1);
+ }
+
+ return ret;
+}
+
+static int fsl_of_msi_remove(struct platform_device *ofdev)
+{
+ struct fsl_msi *msi = platform_get_drvdata(ofdev);
+ int virq, i;
+
+ if (msi->list.prev != NULL)
+ list_del(&msi->list);
+ for (i = 0; i < NR_MSI_REG_MAX; i++) {
+ if (msi->cascade_array[i]) {
+ virq = msi->cascade_array[i]->virq;
+
+ BUG_ON(!virq);
+
+ free_irq(virq, msi->cascade_array[i]);
+ kfree(msi->cascade_array[i]);
+ irq_dispose_mapping(virq);
+ }
+ }
+ if (msi->bitmap.bitmap)
+ msi_bitmap_free(&msi->bitmap);
+ if ((msi->feature & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC)
+ iounmap(msi->msi_regs);
+ kfree(msi);
+
+ return 0;
+}
+
+static struct lock_class_key fsl_msi_irq_class;
+static struct lock_class_key fsl_msi_irq_request_class;
+
+static int fsl_msi_setup_hwirq(struct fsl_msi *msi, struct platform_device *dev,
+ int offset, int irq_index)
+{
+ struct fsl_msi_cascade_data *cascade_data = NULL;
+ int virt_msir, i, ret;
+
+ virt_msir = irq_of_parse_and_map(dev->dev.of_node, irq_index);
+ if (!virt_msir) {
+ dev_err(&dev->dev, "%s: Cannot translate IRQ index %d\n",
+ __func__, irq_index);
+ return 0;
+ }
+
+ 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");
+ return -ENOMEM;
+ }
+ irq_set_lockdep_class(virt_msir, &fsl_msi_irq_class,
+ &fsl_msi_irq_request_class);
+ cascade_data->index = offset;
+ cascade_data->msi_data = msi;
+ cascade_data->virq = virt_msir;
+ msi->cascade_array[irq_index] = cascade_data;
+
+ ret = request_irq(virt_msir, fsl_msi_cascade, IRQF_NO_THREAD,
+ "fsl-msi-cascade", cascade_data);
+ if (ret) {
+ dev_err(&dev->dev, "failed to request_irq(%d), ret = %d\n",
+ virt_msir, ret);
+ return ret;
+ }
+
+ /* Release the hwirqs corresponding to this MSI register */
+ for (i = 0; i < IRQS_PER_MSI_REG; i++)
+ msi_bitmap_free_hwirqs(&msi->bitmap,
+ msi_hwirq(msi, offset, i), 1);
+
+ return 0;
+}
+
+static const struct of_device_id fsl_of_msi_ids[];
+static int fsl_of_msi_probe(struct platform_device *dev)
+{
+ const struct of_device_id *match;
+ struct fsl_msi *msi;
+ struct resource res, msiir;
+ int err, i, j, irq_index, count;
+ const u32 *p;
+ const struct fsl_msi_feature *features;
+ int len;
+ u32 offset;
+ struct pci_controller *phb;
+
+ match = of_match_device(fsl_of_msi_ids, &dev->dev);
+ if (!match)
+ return -EINVAL;
+ 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");
+ return -ENOMEM;
+ }
+ platform_set_drvdata(dev, msi);
+
+ msi->irqhost = irq_domain_add_linear(dev->dev.of_node,
+ NR_MSI_IRQS_MAX, &fsl_msi_host_ops, msi);
+
+ if (msi->irqhost == NULL) {
+ dev_err(&dev->dev, "No memory for MSI irqhost\n");
+ err = -ENOMEM;
+ goto error_out;
+ }
+
+ /*
+ * Under the Freescale hypervisor, the msi nodes don't have a 'reg'
+ * property. Instead, we use hypercalls to access the MSI.
+ */
+ if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) != FSL_PIC_IP_VMPIC) {
+ err = of_address_to_resource(dev->dev.of_node, 0, &res);
+ if (err) {
+ dev_err(&dev->dev, "invalid resource for node %pOF\n",
+ dev->dev.of_node);
+ goto error_out;
+ }
+
+ msi->msi_regs = ioremap(res.start, resource_size(&res));
+ if (!msi->msi_regs) {
+ err = -ENOMEM;
+ dev_err(&dev->dev, "could not map node %pOF\n",
+ dev->dev.of_node);
+ goto error_out;
+ }
+ msi->msiir_offset =
+ features->msiir_offset + (res.start & 0xfffff);
+
+ /*
+ * First read the MSIIR/MSIIR1 offset from dts
+ * On failure use the hardcode MSIIR offset
+ */
+ if (of_address_to_resource(dev->dev.of_node, 1, &msiir))
+ msi->msiir_offset = features->msiir_offset +
+ (res.start & MSIIR_OFFSET_MASK);
+ else
+ msi->msiir_offset = msiir.start & MSIIR_OFFSET_MASK;
+ }
+
+ msi->feature = features->fsl_pic_ip;
+
+ /* For erratum PIC1 on MPIC version 2.0*/
+ if ((features->fsl_pic_ip & FSL_PIC_IP_MASK) == FSL_PIC_IP_MPIC
+ && (fsl_mpic_primary_get_version() == 0x0200))
+ msi->feature |= MSI_HW_ERRATA_ENDIAN;
+
+ /*
+ * Remember the phandle, so that we can match with any PCI nodes
+ * that have an "fsl,msi" property.
+ */
+ msi->phandle = dev->dev.of_node->phandle;
+
+ err = fsl_msi_init_allocator(msi);
+ if (err) {
+ dev_err(&dev->dev, "Error allocating MSI bitmap\n");
+ goto error_out;
+ }
+
+ p = of_get_property(dev->dev.of_node, "msi-available-ranges", &len);
+
+ if (of_device_is_compatible(dev->dev.of_node, "fsl,mpic-msi-v4.3") ||
+ of_device_is_compatible(dev->dev.of_node, "fsl,vmpic-msi-v4.3")) {
+ msi->srs_shift = MSIIR1_SRS_SHIFT;
+ msi->ibs_shift = MSIIR1_IBS_SHIFT;
+ if (p)
+ dev_warn(&dev->dev, "%s: dose not support msi-available-ranges property\n",
+ __func__);
+
+ for (irq_index = 0; irq_index < NR_MSI_REG_MSIIR1;
+ irq_index++) {
+ err = fsl_msi_setup_hwirq(msi, dev,
+ irq_index, irq_index);
+ if (err)
+ goto error_out;
+ }
+ } else {
+ static const u32 all_avail[] =
+ { 0, NR_MSI_REG_MSIIR * IRQS_PER_MSI_REG };
+
+ msi->srs_shift = MSIIR_SRS_SHIFT;
+ msi->ibs_shift = MSIIR_IBS_SHIFT;
+
+ if (p && len % (2 * sizeof(u32)) != 0) {
+ dev_err(&dev->dev, "%s: Malformed msi-available-ranges property\n",
+ __func__);
+ err = -EINVAL;
+ goto error_out;
+ }
+
+ if (!p) {
+ p = all_avail;
+ len = sizeof(all_avail);
+ }
+
+ for (irq_index = 0, i = 0; i < len / (2 * sizeof(u32)); i++) {
+ if (p[i * 2] % IRQS_PER_MSI_REG ||
+ p[i * 2 + 1] % IRQS_PER_MSI_REG) {
+ pr_warn("%s: %pOF: msi available range of %u at %u is not IRQ-aligned\n",
+ __func__, dev->dev.of_node,
+ p[i * 2 + 1], p[i * 2]);
+ err = -EINVAL;
+ goto error_out;
+ }
+
+ offset = p[i * 2] / IRQS_PER_MSI_REG;
+ count = p[i * 2 + 1] / IRQS_PER_MSI_REG;
+
+ for (j = 0; j < count; j++, irq_index++) {
+ err = fsl_msi_setup_hwirq(msi, dev, offset + j,
+ irq_index);
+ if (err)
+ goto error_out;
+ }
+ }
+ }
+
+ list_add_tail(&msi->list, &msi_head);
+
+ /*
+ * Apply the MSI ops to all the controllers.
+ * It doesn't hurt to reassign the same ops,
+ * but bail out if we find another MSI driver.
+ */
+ list_for_each_entry(phb, &hose_list, list_node) {
+ if (!phb->controller_ops.setup_msi_irqs) {
+ phb->controller_ops.setup_msi_irqs = fsl_setup_msi_irqs;
+ phb->controller_ops.teardown_msi_irqs = fsl_teardown_msi_irqs;
+ } else if (phb->controller_ops.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:
+ fsl_of_msi_remove(dev);
+ 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 fsl_msi_feature vmpic_msi_feature = {
+ .fsl_pic_ip = FSL_PIC_IP_VMPIC,
+ .msiir_offset = 0,
+};
+
+static const struct of_device_id fsl_of_msi_ids[] = {
+ {
+ .compatible = "fsl,mpic-msi",
+ .data = &mpic_msi_feature,
+ },
+ {
+ .compatible = "fsl,mpic-msi-v4.3",
+ .data = &mpic_msi_feature,
+ },
+ {
+ .compatible = "fsl,ipic-msi",
+ .data = &ipic_msi_feature,
+ },
+#ifdef CONFIG_EPAPR_PARAVIRT
+ {
+ .compatible = "fsl,vmpic-msi",
+ .data = &vmpic_msi_feature,
+ },
+ {
+ .compatible = "fsl,vmpic-msi-v4.3",
+ .data = &vmpic_msi_feature,
+ },
+#endif
+ {}
+};
+
+static struct platform_driver fsl_of_msi_driver = {
+ .driver = {
+ .name = "fsl-msi",
+ .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)
+{
+ return platform_driver_register(&fsl_of_msi_driver);
+}
+
+subsys_initcall(fsl_of_msi_init);
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