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path: root/drivers/pci/controller/pcie-altera-msi.c
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Diffstat (limited to 'drivers/pci/controller/pcie-altera-msi.c')
-rw-r--r--drivers/pci/controller/pcie-altera-msi.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/drivers/pci/controller/pcie-altera-msi.c b/drivers/pci/controller/pcie-altera-msi.c
new file mode 100644
index 000000000..7b1d3ebc3
--- /dev/null
+++ b/drivers/pci/controller/pcie-altera-msi.c
@@ -0,0 +1,294 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Altera PCIe MSI support
+ *
+ * Author: Ley Foon Tan <lftan@altera.com>
+ *
+ * Copyright Altera Corporation (C) 2013-2015. All rights reserved
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irqchip/chained_irq.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/msi.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_pci.h>
+#include <linux/pci.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#define MSI_STATUS 0x0
+#define MSI_ERROR 0x4
+#define MSI_INTMASK 0x8
+
+#define MAX_MSI_VECTORS 32
+
+struct altera_msi {
+ DECLARE_BITMAP(used, MAX_MSI_VECTORS);
+ struct mutex lock; /* protect "used" bitmap */
+ struct platform_device *pdev;
+ struct irq_domain *msi_domain;
+ struct irq_domain *inner_domain;
+ void __iomem *csr_base;
+ void __iomem *vector_base;
+ phys_addr_t vector_phy;
+ u32 num_of_vectors;
+ int irq;
+};
+
+static inline void msi_writel(struct altera_msi *msi, const u32 value,
+ const u32 reg)
+{
+ writel_relaxed(value, msi->csr_base + reg);
+}
+
+static inline u32 msi_readl(struct altera_msi *msi, const u32 reg)
+{
+ return readl_relaxed(msi->csr_base + reg);
+}
+
+static void altera_msi_isr(struct irq_desc *desc)
+{
+ struct irq_chip *chip = irq_desc_get_chip(desc);
+ struct altera_msi *msi;
+ unsigned long status;
+ u32 bit;
+ int ret;
+
+ chained_irq_enter(chip, desc);
+ msi = irq_desc_get_handler_data(desc);
+
+ while ((status = msi_readl(msi, MSI_STATUS)) != 0) {
+ for_each_set_bit(bit, &status, msi->num_of_vectors) {
+ /* Dummy read from vector to clear the interrupt */
+ readl_relaxed(msi->vector_base + (bit * sizeof(u32)));
+
+ ret = generic_handle_domain_irq(msi->inner_domain, bit);
+ if (ret)
+ dev_err_ratelimited(&msi->pdev->dev, "unexpected MSI\n");
+ }
+ }
+
+ chained_irq_exit(chip, desc);
+}
+
+static struct irq_chip altera_msi_irq_chip = {
+ .name = "Altera PCIe MSI",
+ .irq_mask = pci_msi_mask_irq,
+ .irq_unmask = pci_msi_unmask_irq,
+};
+
+static struct msi_domain_info altera_msi_domain_info = {
+ .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
+ MSI_FLAG_PCI_MSIX),
+ .chip = &altera_msi_irq_chip,
+};
+
+static void altera_compose_msi_msg(struct irq_data *data, struct msi_msg *msg)
+{
+ struct altera_msi *msi = irq_data_get_irq_chip_data(data);
+ phys_addr_t addr = msi->vector_phy + (data->hwirq * sizeof(u32));
+
+ msg->address_lo = lower_32_bits(addr);
+ msg->address_hi = upper_32_bits(addr);
+ msg->data = data->hwirq;
+
+ dev_dbg(&msi->pdev->dev, "msi#%d address_hi %#x address_lo %#x\n",
+ (int)data->hwirq, msg->address_hi, msg->address_lo);
+}
+
+static int altera_msi_set_affinity(struct irq_data *irq_data,
+ const struct cpumask *mask, bool force)
+{
+ return -EINVAL;
+}
+
+static struct irq_chip altera_msi_bottom_irq_chip = {
+ .name = "Altera MSI",
+ .irq_compose_msi_msg = altera_compose_msi_msg,
+ .irq_set_affinity = altera_msi_set_affinity,
+};
+
+static int altera_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
+ unsigned int nr_irqs, void *args)
+{
+ struct altera_msi *msi = domain->host_data;
+ unsigned long bit;
+ u32 mask;
+
+ WARN_ON(nr_irqs != 1);
+ mutex_lock(&msi->lock);
+
+ bit = find_first_zero_bit(msi->used, msi->num_of_vectors);
+ if (bit >= msi->num_of_vectors) {
+ mutex_unlock(&msi->lock);
+ return -ENOSPC;
+ }
+
+ set_bit(bit, msi->used);
+
+ mutex_unlock(&msi->lock);
+
+ irq_domain_set_info(domain, virq, bit, &altera_msi_bottom_irq_chip,
+ domain->host_data, handle_simple_irq,
+ NULL, NULL);
+
+ mask = msi_readl(msi, MSI_INTMASK);
+ mask |= 1 << bit;
+ msi_writel(msi, mask, MSI_INTMASK);
+
+ return 0;
+}
+
+static void altera_irq_domain_free(struct irq_domain *domain,
+ unsigned int virq, unsigned int nr_irqs)
+{
+ struct irq_data *d = irq_domain_get_irq_data(domain, virq);
+ struct altera_msi *msi = irq_data_get_irq_chip_data(d);
+ u32 mask;
+
+ mutex_lock(&msi->lock);
+
+ if (!test_bit(d->hwirq, msi->used)) {
+ dev_err(&msi->pdev->dev, "trying to free unused MSI#%lu\n",
+ d->hwirq);
+ } else {
+ __clear_bit(d->hwirq, msi->used);
+ mask = msi_readl(msi, MSI_INTMASK);
+ mask &= ~(1 << d->hwirq);
+ msi_writel(msi, mask, MSI_INTMASK);
+ }
+
+ mutex_unlock(&msi->lock);
+}
+
+static const struct irq_domain_ops msi_domain_ops = {
+ .alloc = altera_irq_domain_alloc,
+ .free = altera_irq_domain_free,
+};
+
+static int altera_allocate_domains(struct altera_msi *msi)
+{
+ struct fwnode_handle *fwnode = of_node_to_fwnode(msi->pdev->dev.of_node);
+
+ msi->inner_domain = irq_domain_add_linear(NULL, msi->num_of_vectors,
+ &msi_domain_ops, msi);
+ if (!msi->inner_domain) {
+ dev_err(&msi->pdev->dev, "failed to create IRQ domain\n");
+ return -ENOMEM;
+ }
+
+ msi->msi_domain = pci_msi_create_irq_domain(fwnode,
+ &altera_msi_domain_info, msi->inner_domain);
+ if (!msi->msi_domain) {
+ dev_err(&msi->pdev->dev, "failed to create MSI domain\n");
+ irq_domain_remove(msi->inner_domain);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+static void altera_free_domains(struct altera_msi *msi)
+{
+ irq_domain_remove(msi->msi_domain);
+ irq_domain_remove(msi->inner_domain);
+}
+
+static int altera_msi_remove(struct platform_device *pdev)
+{
+ struct altera_msi *msi = platform_get_drvdata(pdev);
+
+ msi_writel(msi, 0, MSI_INTMASK);
+ irq_set_chained_handler_and_data(msi->irq, NULL, NULL);
+
+ altera_free_domains(msi);
+
+ platform_set_drvdata(pdev, NULL);
+ return 0;
+}
+
+static int altera_msi_probe(struct platform_device *pdev)
+{
+ struct altera_msi *msi;
+ struct device_node *np = pdev->dev.of_node;
+ struct resource *res;
+ int ret;
+
+ msi = devm_kzalloc(&pdev->dev, sizeof(struct altera_msi),
+ GFP_KERNEL);
+ if (!msi)
+ return -ENOMEM;
+
+ mutex_init(&msi->lock);
+ msi->pdev = pdev;
+
+ msi->csr_base = devm_platform_ioremap_resource_byname(pdev, "csr");
+ if (IS_ERR(msi->csr_base)) {
+ dev_err(&pdev->dev, "failed to map csr memory\n");
+ return PTR_ERR(msi->csr_base);
+ }
+
+ res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
+ "vector_slave");
+ msi->vector_base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(msi->vector_base))
+ return PTR_ERR(msi->vector_base);
+
+ msi->vector_phy = res->start;
+
+ if (of_property_read_u32(np, "num-vectors", &msi->num_of_vectors)) {
+ dev_err(&pdev->dev, "failed to parse the number of vectors\n");
+ return -EINVAL;
+ }
+
+ ret = altera_allocate_domains(msi);
+ if (ret)
+ return ret;
+
+ msi->irq = platform_get_irq(pdev, 0);
+ if (msi->irq < 0) {
+ ret = msi->irq;
+ goto err;
+ }
+
+ irq_set_chained_handler_and_data(msi->irq, altera_msi_isr, msi);
+ platform_set_drvdata(pdev, msi);
+
+ return 0;
+
+err:
+ altera_msi_remove(pdev);
+ return ret;
+}
+
+static const struct of_device_id altera_msi_of_match[] = {
+ { .compatible = "altr,msi-1.0", NULL },
+ { },
+};
+
+static struct platform_driver altera_msi_driver = {
+ .driver = {
+ .name = "altera-msi",
+ .of_match_table = altera_msi_of_match,
+ },
+ .probe = altera_msi_probe,
+ .remove = altera_msi_remove,
+};
+
+static int __init altera_msi_init(void)
+{
+ return platform_driver_register(&altera_msi_driver);
+}
+
+static void __exit altera_msi_exit(void)
+{
+ platform_driver_unregister(&altera_msi_driver);
+}
+
+subsys_initcall(altera_msi_init);
+MODULE_DEVICE_TABLE(of, altera_msi_of_match);
+module_exit(altera_msi_exit);
+MODULE_LICENSE("GPL v2");