diff options
Diffstat (limited to 'drivers/irqchip/irq-tb10x.c')
| -rw-r--r-- | drivers/irqchip/irq-tb10x.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-tb10x.c b/drivers/irqchip/irq-tb10x.c new file mode 100644 index 000000000..848d782a2 --- /dev/null +++ b/drivers/irqchip/irq-tb10x.c @@ -0,0 +1,196 @@ +/* + * Abilis Systems interrupt controller driver + * + * Copyright (C) Abilis Systems 2012 + * + * Author: Christian Ruppert <christian.ruppert@abilis.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include <linux/interrupt.h> +#include <linux/irqdomain.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_platform.h> +#include <linux/io.h> +#include <linux/slab.h> +#include <linux/bitops.h> + +#define AB_IRQCTL_INT_ENABLE 0x00 +#define AB_IRQCTL_INT_STATUS 0x04 +#define AB_IRQCTL_SRC_MODE 0x08 +#define AB_IRQCTL_SRC_POLARITY 0x0C +#define AB_IRQCTL_INT_MODE 0x10 +#define AB_IRQCTL_INT_POLARITY 0x14 +#define AB_IRQCTL_INT_FORCE 0x18 + +#define AB_IRQCTL_MAXIRQ 32 + +static inline void ab_irqctl_writereg(struct irq_chip_generic *gc, u32 reg, + u32 val) +{ + irq_reg_writel(gc, val, reg); +} + +static inline u32 ab_irqctl_readreg(struct irq_chip_generic *gc, u32 reg) +{ + return irq_reg_readl(gc, reg); +} + +static int tb10x_irq_set_type(struct irq_data *data, unsigned int flow_type) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data); + uint32_t im, mod, pol; + + im = data->mask; + + irq_gc_lock(gc); + + mod = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_MODE) | im; + pol = ab_irqctl_readreg(gc, AB_IRQCTL_SRC_POLARITY) | im; + + switch (flow_type & IRQF_TRIGGER_MASK) { + case IRQ_TYPE_EDGE_FALLING: + pol ^= im; + break; + case IRQ_TYPE_LEVEL_HIGH: + mod ^= im; + break; + case IRQ_TYPE_NONE: + flow_type = IRQ_TYPE_LEVEL_LOW; + case IRQ_TYPE_LEVEL_LOW: + mod ^= im; + pol ^= im; + break; + case IRQ_TYPE_EDGE_RISING: + break; + default: + irq_gc_unlock(gc); + pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n", + __func__, data->irq); + return -EBADR; + } + + irqd_set_trigger_type(data, flow_type); + irq_setup_alt_chip(data, flow_type); + + ab_irqctl_writereg(gc, AB_IRQCTL_SRC_MODE, mod); + ab_irqctl_writereg(gc, AB_IRQCTL_SRC_POLARITY, pol); + ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, im); + + irq_gc_unlock(gc); + + return IRQ_SET_MASK_OK; +} + +static void tb10x_irq_cascade(struct irq_desc *desc) +{ + struct irq_domain *domain = irq_desc_get_handler_data(desc); + unsigned int irq = irq_desc_get_irq(desc); + + generic_handle_irq(irq_find_mapping(domain, irq)); +} + +static int __init of_tb10x_init_irq(struct device_node *ictl, + struct device_node *parent) +{ + int i, ret, nrirqs = of_irq_count(ictl); + struct resource mem; + struct irq_chip_generic *gc; + struct irq_domain *domain; + void __iomem *reg_base; + + if (of_address_to_resource(ictl, 0, &mem)) { + pr_err("%s: No registers declared in DeviceTree.\n", + ictl->name); + return -EINVAL; + } + + if (!request_mem_region(mem.start, resource_size(&mem), + ictl->name)) { + pr_err("%s: Request mem region failed.\n", ictl->name); + return -EBUSY; + } + + reg_base = ioremap(mem.start, resource_size(&mem)); + if (!reg_base) { + ret = -EBUSY; + pr_err("%s: ioremap failed.\n", ictl->name); + goto ioremap_fail; + } + + domain = irq_domain_add_linear(ictl, AB_IRQCTL_MAXIRQ, + &irq_generic_chip_ops, NULL); + if (!domain) { + ret = -ENOMEM; + pr_err("%s: Could not register interrupt domain.\n", + ictl->name); + goto irq_domain_add_fail; + } + + ret = irq_alloc_domain_generic_chips(domain, AB_IRQCTL_MAXIRQ, + 2, ictl->name, handle_level_irq, + IRQ_NOREQUEST, IRQ_NOPROBE, + IRQ_GC_INIT_MASK_CACHE); + if (ret) { + pr_err("%s: Could not allocate generic interrupt chip.\n", + ictl->name); + goto gc_alloc_fail; + } + + gc = domain->gc->gc[0]; + gc->reg_base = reg_base; + + gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK; + gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit; + gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit; + gc->chip_types[0].chip.irq_set_type = tb10x_irq_set_type; + gc->chip_types[0].regs.mask = AB_IRQCTL_INT_ENABLE; + + gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH; + gc->chip_types[1].chip.name = gc->chip_types[0].chip.name; + gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit; + gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit; + gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit; + gc->chip_types[1].chip.irq_set_type = tb10x_irq_set_type; + gc->chip_types[1].regs.ack = AB_IRQCTL_INT_STATUS; + gc->chip_types[1].regs.mask = AB_IRQCTL_INT_ENABLE; + gc->chip_types[1].handler = handle_edge_irq; + + for (i = 0; i < nrirqs; i++) { + unsigned int irq = irq_of_parse_and_map(ictl, i); + + irq_set_chained_handler_and_data(irq, tb10x_irq_cascade, + domain); + } + + ab_irqctl_writereg(gc, AB_IRQCTL_INT_ENABLE, 0); + ab_irqctl_writereg(gc, AB_IRQCTL_INT_MODE, 0); + ab_irqctl_writereg(gc, AB_IRQCTL_INT_POLARITY, 0); + ab_irqctl_writereg(gc, AB_IRQCTL_INT_STATUS, ~0UL); + + return 0; + +gc_alloc_fail: + irq_domain_remove(domain); +irq_domain_add_fail: + iounmap(reg_base); +ioremap_fail: + release_mem_region(mem.start, resource_size(&mem)); + return ret; +} +IRQCHIP_DECLARE(tb10x_intc, "abilis,tb10x-ictl", of_tb10x_init_irq); |