diff options
Diffstat (limited to 'drivers/irqchip/irq-mvebu-gicp.c')
| -rw-r--r-- | drivers/irqchip/irq-mvebu-gicp.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mvebu-gicp.c b/drivers/irqchip/irq-mvebu-gicp.c new file mode 100644 index 000000000000..b283fc90be1e --- /dev/null +++ b/drivers/irqchip/irq-mvebu-gicp.c @@ -0,0 +1,279 @@ +/* + * 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> + +#include "irq-mvebu-gicp.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; +} + +int mvebu_gicp_get_doorbells(struct device_node *dn, phys_addr_t *setspi, + phys_addr_t *clrspi) +{ + struct platform_device *pdev; + struct mvebu_gicp *gicp; + + pdev = of_find_device_by_node(dn); + if (!pdev) + return -ENODEV; + + gicp = platform_get_drvdata(pdev); + if (!gicp) + return -ENODEV; + + *setspi = gicp->res->start + GICP_SETSPI_NSR_OFFSET; + *clrspi = gicp->res->start + GICP_CLRSPI_NSR_OFFSET; + + return 0; +} + +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; + + msg->data = data->hwirq; + msg->address_lo = lower_32_bits(setspi); + msg->address_hi = upper_32_bits(setspi); +} + +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, +}; + +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), + .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; + + 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_kzalloc(&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_kzalloc(&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); |