/* * Copyright (C) 2017 Marvell * * Thomas Petazzoni <thomas.petazzoni@free-electrons.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/io.h> #include <linux/irq.h> #include <linux/irqdomain.h> #include <linux/msi.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <dt-bindings/interrupt-controller/arm-gic.h> #define GICP_SETSPI_NSR_OFFSET 0x0 #define GICP_CLRSPI_NSR_OFFSET 0x8 struct mvebu_gicp_spi_range { unsigned int start; unsigned int count; }; struct mvebu_gicp { struct mvebu_gicp_spi_range *spi_ranges; unsigned int spi_ranges_cnt; unsigned int spi_cnt; unsigned long *spi_bitmap; spinlock_t spi_lock; struct resource *res; struct device *dev; }; static int gicp_idx_to_spi(struct mvebu_gicp *gicp, int idx) { int i; for (i = 0; i < gicp->spi_ranges_cnt; i++) { struct mvebu_gicp_spi_range *r = &gicp->spi_ranges[i]; if (idx < r->count) return r->start + idx; idx -= r->count; } return -EINVAL; } static void gicp_compose_msi_msg(struct irq_data *data, struct msi_msg *msg) { struct mvebu_gicp *gicp = data->chip_data; phys_addr_t setspi = gicp->res->start + GICP_SETSPI_NSR_OFFSET; phys_addr_t clrspi = gicp->res->start + GICP_CLRSPI_NSR_OFFSET; msg[0].data = data->hwirq; msg[0].address_lo = lower_32_bits(setspi); msg[0].address_hi = upper_32_bits(setspi); msg[1].data = data->hwirq; msg[1].address_lo = lower_32_bits(clrspi); msg[1].address_hi = upper_32_bits(clrspi); } static struct irq_chip gicp_irq_chip = { .name = "GICP", .irq_mask = irq_chip_mask_parent, .irq_unmask = irq_chip_unmask_parent, .irq_eoi = irq_chip_eoi_parent, .irq_set_affinity = irq_chip_set_affinity_parent, .irq_set_type = irq_chip_set_type_parent, .irq_compose_msi_msg = gicp_compose_msi_msg, }; static int gicp_irq_domain_alloc(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs, void *args) { struct mvebu_gicp *gicp = domain->host_data; struct irq_fwspec fwspec; unsigned int hwirq; int ret; spin_lock(&gicp->spi_lock); hwirq = find_first_zero_bit(gicp->spi_bitmap, gicp->spi_cnt); if (hwirq == gicp->spi_cnt) { spin_unlock(&gicp->spi_lock); return -ENOSPC; } __set_bit(hwirq, gicp->spi_bitmap); spin_unlock(&gicp->spi_lock); fwspec.fwnode = domain->parent->fwnode; fwspec.param_count = 3; fwspec.param[0] = GIC_SPI; fwspec.param[1] = gicp_idx_to_spi(gicp, hwirq) - 32; /* * Assume edge rising for now, it will be properly set when * ->set_type() is called */ fwspec.param[2] = IRQ_TYPE_EDGE_RISING; ret = irq_domain_alloc_irqs_parent(domain, virq, 1, &fwspec); if (ret) { dev_err(gicp->dev, "Cannot allocate parent IRQ\n"); goto free_hwirq; } ret = irq_domain_set_hwirq_and_chip(domain, virq, hwirq, &gicp_irq_chip, gicp); if (ret) goto free_irqs_parent; return 0; free_irqs_parent: irq_domain_free_irqs_parent(domain, virq, nr_irqs); free_hwirq: spin_lock(&gicp->spi_lock); __clear_bit(hwirq, gicp->spi_bitmap); spin_unlock(&gicp->spi_lock); return ret; } static void gicp_irq_domain_free(struct irq_domain *domain, unsigned int virq, unsigned int nr_irqs) { struct mvebu_gicp *gicp = domain->host_data; struct irq_data *d = irq_domain_get_irq_data(domain, virq); if (d->hwirq >= gicp->spi_cnt) { dev_err(gicp->dev, "Invalid hwirq %lu\n", d->hwirq); return; } irq_domain_free_irqs_parent(domain, virq, nr_irqs); spin_lock(&gicp->spi_lock); __clear_bit(d->hwirq, gicp->spi_bitmap); spin_unlock(&gicp->spi_lock); } static const struct irq_domain_ops gicp_domain_ops = { .alloc = gicp_irq_domain_alloc, .free = gicp_irq_domain_free, }; static struct irq_chip gicp_msi_irq_chip = { .name = "GICP", .irq_set_type = irq_chip_set_type_parent, .flags = IRQCHIP_SUPPORTS_LEVEL_MSI, }; static struct msi_domain_ops gicp_msi_ops = { }; static struct msi_domain_info gicp_msi_domain_info = { .flags = (MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS | MSI_FLAG_LEVEL_CAPABLE), .ops = &gicp_msi_ops, .chip = &gicp_msi_irq_chip, }; static int mvebu_gicp_probe(struct platform_device *pdev) { struct mvebu_gicp *gicp; struct irq_domain *inner_domain, *plat_domain, *parent_domain; struct device_node *node = pdev->dev.of_node; struct device_node *irq_parent_dn; int ret, i; gicp = devm_kzalloc(&pdev->dev, sizeof(*gicp), GFP_KERNEL); if (!gicp) return -ENOMEM; gicp->dev = &pdev->dev; spin_lock_init(&gicp->spi_lock); gicp->res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!gicp->res) return -ENODEV; ret = of_property_count_u32_elems(node, "marvell,spi-ranges"); if (ret < 0) return ret; gicp->spi_ranges_cnt = ret / 2; gicp->spi_ranges = devm_kcalloc(&pdev->dev, gicp->spi_ranges_cnt, sizeof(struct mvebu_gicp_spi_range), GFP_KERNEL); if (!gicp->spi_ranges) return -ENOMEM; for (i = 0; i < gicp->spi_ranges_cnt; i++) { of_property_read_u32_index(node, "marvell,spi-ranges", i * 2, &gicp->spi_ranges[i].start); of_property_read_u32_index(node, "marvell,spi-ranges", i * 2 + 1, &gicp->spi_ranges[i].count); gicp->spi_cnt += gicp->spi_ranges[i].count; } gicp->spi_bitmap = devm_kcalloc(&pdev->dev, BITS_TO_LONGS(gicp->spi_cnt), sizeof(long), GFP_KERNEL); if (!gicp->spi_bitmap) return -ENOMEM; irq_parent_dn = of_irq_find_parent(node); if (!irq_parent_dn) { dev_err(&pdev->dev, "failed to find parent IRQ node\n"); return -ENODEV; } parent_domain = irq_find_host(irq_parent_dn); if (!parent_domain) { dev_err(&pdev->dev, "failed to find parent IRQ domain\n"); return -ENODEV; } inner_domain = irq_domain_create_hierarchy(parent_domain, 0, gicp->spi_cnt, of_node_to_fwnode(node), &gicp_domain_ops, gicp); if (!inner_domain) return -ENOMEM; plat_domain = platform_msi_create_irq_domain(of_node_to_fwnode(node), &gicp_msi_domain_info, inner_domain); if (!plat_domain) { irq_domain_remove(inner_domain); return -ENOMEM; } platform_set_drvdata(pdev, gicp); return 0; } static const struct of_device_id mvebu_gicp_of_match[] = { { .compatible = "marvell,ap806-gicp", }, {}, }; static struct platform_driver mvebu_gicp_driver = { .probe = mvebu_gicp_probe, .driver = { .name = "mvebu-gicp", .of_match_table = mvebu_gicp_of_match, }, }; builtin_platform_driver(mvebu_gicp_driver);