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author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2018-03-22 16:15:24 +0100 |
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committer | Marc Zyngier <marc.zyngier@arm.com> | 2018-03-22 15:52:27 +0000 |
commit | 19d99164480a34db66941cf995bdd996cc266fc0 (patch) | |
tree | d4c4a7e8db379d0af230a0fee202311d38461ce2 /drivers/irqchip/irq-mscc-ocelot.c | |
parent | c927d74ec0319abb0b232adf9dbe4e7be3791328 (diff) | |
download | linux-19d99164480a34db66941cf995bdd996cc266fc0.tar.gz linux-19d99164480a34db66941cf995bdd996cc266fc0.tar.bz2 linux-19d99164480a34db66941cf995bdd996cc266fc0.zip |
irqchip: Add a driver for the Microsemi Ocelot controller
The Microsemi Ocelot SoC has a pretty simple IRQ controller in its ICPU
block. Add a driver for it.
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip/irq-mscc-ocelot.c')
-rw-r--r-- | drivers/irqchip/irq-mscc-ocelot.c | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-mscc-ocelot.c b/drivers/irqchip/irq-mscc-ocelot.c new file mode 100644 index 000000000000..b63e40c00a02 --- /dev/null +++ b/drivers/irqchip/irq-mscc-ocelot.c @@ -0,0 +1,118 @@ +// SPDX-License-Identifier: (GPL-2.0 OR MIT) +/* + * Microsemi Ocelot IRQ controller driver + * + * Copyright (c) 2017 Microsemi Corporation + */ +#include <linux/bitops.h> +#include <linux/irq.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/interrupt.h> + +#define ICPU_CFG_INTR_INTR_STICKY 0x10 +#define ICPU_CFG_INTR_INTR_ENA 0x18 +#define ICPU_CFG_INTR_INTR_ENA_CLR 0x1c +#define ICPU_CFG_INTR_INTR_ENA_SET 0x20 +#define ICPU_CFG_INTR_DST_INTR_IDENT(x) (0x38 + 0x4 * (x)) +#define ICPU_CFG_INTR_INTR_TRIGGER(x) (0x5c + 0x4 * (x)) + +#define OCELOT_NR_IRQ 24 + +static void ocelot_irq_unmask(struct irq_data *data) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + struct irq_chip_type *ct = irq_data_get_chip_type(data); + unsigned int mask = data->mask; + u32 val; + + irq_gc_lock(gc); + val = irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(0)) | + irq_reg_readl(gc, ICPU_CFG_INTR_INTR_TRIGGER(1)); + if (!(val & mask)) + irq_reg_writel(gc, mask, ICPU_CFG_INTR_INTR_STICKY); + + *ct->mask_cache &= ~mask; + irq_reg_writel(gc, mask, ICPU_CFG_INTR_INTR_ENA_SET); + irq_gc_unlock(gc); +} + +static void ocelot_irq_handler(struct irq_desc *desc) +{ + struct irq_chip *chip = irq_desc_get_chip(desc); + struct irq_domain *d = irq_desc_get_handler_data(desc); + struct irq_chip_generic *gc = irq_get_domain_generic_chip(d, 0); + u32 reg = irq_reg_readl(gc, ICPU_CFG_INTR_DST_INTR_IDENT(0)); + + chained_irq_enter(chip, desc); + + while (reg) { + u32 hwirq = __fls(reg); + + generic_handle_irq(irq_find_mapping(d, hwirq)); + reg &= ~(BIT(hwirq)); + } + + chained_irq_exit(chip, desc); +} + +static int __init ocelot_irq_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_domain *domain; + struct irq_chip_generic *gc; + int parent_irq, ret; + + parent_irq = irq_of_parse_and_map(node, 0); + if (!parent_irq) + return -EINVAL; + + domain = irq_domain_add_linear(node, OCELOT_NR_IRQ, + &irq_generic_chip_ops, NULL); + if (!domain) { + pr_err("%s: unable to add irq domain\n", node->name); + return -ENOMEM; + } + + ret = irq_alloc_domain_generic_chips(domain, OCELOT_NR_IRQ, 1, + "icpu", handle_level_irq, + 0, 0, 0); + if (ret) { + pr_err("%s: unable to alloc irq domain gc\n", node->name); + goto err_domain_remove; + } + + gc = irq_get_domain_generic_chip(domain, 0); + gc->reg_base = of_iomap(node, 0); + if (!gc->reg_base) { + pr_err("%s: unable to map resource\n", node->name); + ret = -ENOMEM; + goto err_gc_free; + } + + gc->chip_types[0].regs.ack = ICPU_CFG_INTR_INTR_STICKY; + gc->chip_types[0].regs.mask = ICPU_CFG_INTR_INTR_ENA_CLR; + gc->chip_types[0].chip.irq_ack = irq_gc_ack_set_bit; + gc->chip_types[0].chip.irq_mask = irq_gc_mask_set_bit; + gc->chip_types[0].chip.irq_unmask = ocelot_irq_unmask; + + /* Mask and ack all interrupts */ + irq_reg_writel(gc, 0, ICPU_CFG_INTR_INTR_ENA); + irq_reg_writel(gc, 0xffffffff, ICPU_CFG_INTR_INTR_STICKY); + + irq_set_chained_handler_and_data(parent_irq, ocelot_irq_handler, + domain); + + return 0; + +err_gc_free: + irq_free_generic_chip(gc); + +err_domain_remove: + irq_domain_remove(domain); + + return ret; +} +IRQCHIP_DECLARE(ocelot_icpu, "mscc,ocelot-icpu-intr", ocelot_irq_init); |