diff options
Diffstat (limited to 'drivers/irqchip/irq-mvebu-pic.c')
| -rw-r--r-- | drivers/irqchip/irq-mvebu-pic.c | 200 |
1 files changed, 200 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mvebu-pic.c b/drivers/irqchip/irq-mvebu-pic.c new file mode 100644 index 000000000..ef3d3646c --- /dev/null +++ b/drivers/irqchip/irq-mvebu-pic.c @@ -0,0 +1,200 @@ +/* + * Copyright (C) 2016 Marvell + * + * Yehuda Yitschak <yehuday@marvell.com> + * 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/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/seq_file.h> + +#define PIC_CAUSE 0x0 +#define PIC_MASK 0x4 + +#define PIC_MAX_IRQS 32 +#define PIC_MAX_IRQ_MASK ((1UL << PIC_MAX_IRQS) - 1) + +struct mvebu_pic { + void __iomem *base; + u32 parent_irq; + struct irq_domain *domain; + struct platform_device *pdev; +}; + +static void mvebu_pic_reset(struct mvebu_pic *pic) +{ + /* ACK and mask all interrupts */ + writel(0, pic->base + PIC_MASK); + writel(PIC_MAX_IRQ_MASK, pic->base + PIC_CAUSE); +} + +static void mvebu_pic_eoi_irq(struct irq_data *d) +{ + struct mvebu_pic *pic = irq_data_get_irq_chip_data(d); + + writel(1 << d->hwirq, pic->base + PIC_CAUSE); +} + +static void mvebu_pic_mask_irq(struct irq_data *d) +{ + struct mvebu_pic *pic = irq_data_get_irq_chip_data(d); + u32 reg; + + reg = readl(pic->base + PIC_MASK); + reg |= (1 << d->hwirq); + writel(reg, pic->base + PIC_MASK); +} + +static void mvebu_pic_unmask_irq(struct irq_data *d) +{ + struct mvebu_pic *pic = irq_data_get_irq_chip_data(d); + u32 reg; + + reg = readl(pic->base + PIC_MASK); + reg &= ~(1 << d->hwirq); + writel(reg, pic->base + PIC_MASK); +} + +static void mvebu_pic_print_chip(struct irq_data *d, struct seq_file *p) +{ + struct mvebu_pic *pic = irq_data_get_irq_chip_data(d); + + seq_printf(p, dev_name(&pic->pdev->dev)); +} + +static const struct irq_chip mvebu_pic_chip = { + .irq_mask = mvebu_pic_mask_irq, + .irq_unmask = mvebu_pic_unmask_irq, + .irq_eoi = mvebu_pic_eoi_irq, + .irq_print_chip = mvebu_pic_print_chip, +}; + +static int mvebu_pic_irq_map(struct irq_domain *domain, unsigned int virq, + irq_hw_number_t hwirq) +{ + struct mvebu_pic *pic = domain->host_data; + + irq_set_percpu_devid(virq); + irq_set_chip_data(virq, pic); + irq_set_chip_and_handler(virq, &mvebu_pic_chip, handle_percpu_devid_irq); + irq_set_status_flags(virq, IRQ_LEVEL); + irq_set_probe(virq); + + return 0; +} + +static const struct irq_domain_ops mvebu_pic_domain_ops = { + .map = mvebu_pic_irq_map, + .xlate = irq_domain_xlate_onecell, +}; + +static void mvebu_pic_handle_cascade_irq(struct irq_desc *desc) +{ + struct mvebu_pic *pic = irq_desc_get_handler_data(desc); + struct irq_chip *chip = irq_desc_get_chip(desc); + unsigned long irqmap, irqn; + + irqmap = readl_relaxed(pic->base + PIC_CAUSE); + chained_irq_enter(chip, desc); + + for_each_set_bit(irqn, &irqmap, BITS_PER_LONG) + generic_handle_domain_irq(pic->domain, irqn); + + chained_irq_exit(chip, desc); +} + +static void mvebu_pic_enable_percpu_irq(void *data) +{ + struct mvebu_pic *pic = data; + + mvebu_pic_reset(pic); + enable_percpu_irq(pic->parent_irq, IRQ_TYPE_NONE); +} + +static void mvebu_pic_disable_percpu_irq(void *data) +{ + struct mvebu_pic *pic = data; + + disable_percpu_irq(pic->parent_irq); +} + +static int mvebu_pic_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct mvebu_pic *pic; + + pic = devm_kzalloc(&pdev->dev, sizeof(struct mvebu_pic), GFP_KERNEL); + if (!pic) + return -ENOMEM; + + pic->pdev = pdev; + pic->base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(pic->base)) + return PTR_ERR(pic->base); + + pic->parent_irq = irq_of_parse_and_map(node, 0); + if (pic->parent_irq <= 0) { + dev_err(&pdev->dev, "Failed to parse parent interrupt\n"); + return -EINVAL; + } + + pic->domain = irq_domain_add_linear(node, PIC_MAX_IRQS, + &mvebu_pic_domain_ops, pic); + if (!pic->domain) { + dev_err(&pdev->dev, "Failed to allocate irq domain\n"); + return -ENOMEM; + } + + irq_set_chained_handler(pic->parent_irq, mvebu_pic_handle_cascade_irq); + irq_set_handler_data(pic->parent_irq, pic); + + on_each_cpu(mvebu_pic_enable_percpu_irq, pic, 1); + + platform_set_drvdata(pdev, pic); + + return 0; +} + +static int mvebu_pic_remove(struct platform_device *pdev) +{ + struct mvebu_pic *pic = platform_get_drvdata(pdev); + + on_each_cpu(mvebu_pic_disable_percpu_irq, pic, 1); + irq_domain_remove(pic->domain); + + return 0; +} + +static const struct of_device_id mvebu_pic_of_match[] = { + { .compatible = "marvell,armada-8k-pic", }, + {}, +}; +MODULE_DEVICE_TABLE(of, mvebu_pic_of_match); + +static struct platform_driver mvebu_pic_driver = { + .probe = mvebu_pic_probe, + .remove = mvebu_pic_remove, + .driver = { + .name = "mvebu-pic", + .of_match_table = mvebu_pic_of_match, + }, +}; +module_platform_driver(mvebu_pic_driver); + +MODULE_AUTHOR("Yehuda Yitschak <yehuday@marvell.com>"); +MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:mvebu_pic"); + |