diff options
Diffstat (limited to 'drivers/irqchip/irq-atmel-aic.c')
| -rw-r--r-- | drivers/irqchip/irq-atmel-aic.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c new file mode 100644 index 000000000..4631f6847 --- /dev/null +++ b/drivers/irqchip/irq-atmel-aic.c @@ -0,0 +1,274 @@ +/* + * Atmel AT91 AIC (Advanced Interrupt Controller) driver + * + * Copyright (C) 2004 SAN People + * Copyright (C) 2004 ATMEL + * Copyright (C) Rick Bronson + * Copyright (C) 2014 Free Electrons + * + * Author: Boris BREZILLON <boris.brezillon@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/init.h> +#include <linux/module.h> +#include <linux/mm.h> +#include <linux/bitmap.h> +#include <linux/types.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/irqdomain.h> +#include <linux/err.h> +#include <linux/slab.h> +#include <linux/io.h> + +#include <asm/exception.h> +#include <asm/mach/irq.h> + +#include "irq-atmel-aic-common.h" + +/* Number of irq lines managed by AIC */ +#define NR_AIC_IRQS 32 + +#define AT91_AIC_SMR(n) ((n) * 4) + +#define AT91_AIC_SVR(n) (0x80 + ((n) * 4)) +#define AT91_AIC_IVR 0x100 +#define AT91_AIC_FVR 0x104 +#define AT91_AIC_ISR 0x108 + +#define AT91_AIC_IPR 0x10c +#define AT91_AIC_IMR 0x110 +#define AT91_AIC_CISR 0x114 + +#define AT91_AIC_IECR 0x120 +#define AT91_AIC_IDCR 0x124 +#define AT91_AIC_ICCR 0x128 +#define AT91_AIC_ISCR 0x12c +#define AT91_AIC_EOICR 0x130 +#define AT91_AIC_SPU 0x134 +#define AT91_AIC_DCR 0x138 + +static struct irq_domain *aic_domain; + +static asmlinkage void __exception_irq_entry +aic_handle(struct pt_regs *regs) +{ + struct irq_domain_chip_generic *dgc = aic_domain->gc; + struct irq_chip_generic *gc = dgc->gc[0]; + u32 irqnr; + u32 irqstat; + + irqnr = irq_reg_readl(gc, AT91_AIC_IVR); + irqstat = irq_reg_readl(gc, AT91_AIC_ISR); + + if (!irqstat) + irq_reg_writel(gc, 0, AT91_AIC_EOICR); + else + generic_handle_domain_irq(aic_domain, irqnr); +} + +static int aic_retrigger(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + + /* Enable interrupt on AIC5 */ + irq_gc_lock(gc); + irq_reg_writel(gc, d->mask, AT91_AIC_ISCR); + irq_gc_unlock(gc); + + return 1; +} + +static int aic_set_type(struct irq_data *d, unsigned type) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + unsigned int smr; + int ret; + + smr = irq_reg_readl(gc, AT91_AIC_SMR(d->hwirq)); + ret = aic_common_set_type(d, type, &smr); + if (ret) + return ret; + + irq_reg_writel(gc, smr, AT91_AIC_SMR(d->hwirq)); + + return 0; +} + +#ifdef CONFIG_PM +static void aic_suspend(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + + irq_gc_lock(gc); + irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IDCR); + irq_reg_writel(gc, gc->wake_active, AT91_AIC_IECR); + irq_gc_unlock(gc); +} + +static void aic_resume(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + + irq_gc_lock(gc); + irq_reg_writel(gc, gc->wake_active, AT91_AIC_IDCR); + irq_reg_writel(gc, gc->mask_cache, AT91_AIC_IECR); + irq_gc_unlock(gc); +} + +static void aic_pm_shutdown(struct irq_data *d) +{ + struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d); + + irq_gc_lock(gc); + irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR); + irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR); + irq_gc_unlock(gc); +} +#else +#define aic_suspend NULL +#define aic_resume NULL +#define aic_pm_shutdown NULL +#endif /* CONFIG_PM */ + +static void __init aic_hw_init(struct irq_domain *domain) +{ + struct irq_chip_generic *gc = irq_get_domain_generic_chip(domain, 0); + int i; + + /* + * Perform 8 End Of Interrupt Command to make sure AIC + * will not Lock out nIRQ + */ + for (i = 0; i < 8; i++) + irq_reg_writel(gc, 0, AT91_AIC_EOICR); + + /* + * Spurious Interrupt ID in Spurious Vector Register. + * When there is no current interrupt, the IRQ Vector Register + * reads the value stored in AIC_SPU + */ + irq_reg_writel(gc, 0xffffffff, AT91_AIC_SPU); + + /* No debugging in AIC: Debug (Protect) Control Register */ + irq_reg_writel(gc, 0, AT91_AIC_DCR); + + /* Disable and clear all interrupts initially */ + irq_reg_writel(gc, 0xffffffff, AT91_AIC_IDCR); + irq_reg_writel(gc, 0xffffffff, AT91_AIC_ICCR); + + for (i = 0; i < 32; i++) + irq_reg_writel(gc, i, AT91_AIC_SVR(i)); +} + +static int aic_irq_domain_xlate(struct irq_domain *d, + struct device_node *ctrlr, + const u32 *intspec, unsigned int intsize, + irq_hw_number_t *out_hwirq, + unsigned int *out_type) +{ + struct irq_domain_chip_generic *dgc = d->gc; + struct irq_chip_generic *gc; + unsigned long flags; + unsigned smr; + int idx; + int ret; + + if (!dgc) + return -EINVAL; + + ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize, + out_hwirq, out_type); + if (ret) + return ret; + + idx = intspec[0] / dgc->irqs_per_chip; + if (idx >= dgc->num_chips) + return -EINVAL; + + gc = dgc->gc[idx]; + + irq_gc_lock_irqsave(gc, flags); + smr = irq_reg_readl(gc, AT91_AIC_SMR(*out_hwirq)); + aic_common_set_priority(intspec[2], &smr); + irq_reg_writel(gc, smr, AT91_AIC_SMR(*out_hwirq)); + irq_gc_unlock_irqrestore(gc, flags); + + return ret; +} + +static const struct irq_domain_ops aic_irq_ops = { + .map = irq_map_generic_chip, + .xlate = aic_irq_domain_xlate, +}; + +static void __init at91rm9200_aic_irq_fixup(void) +{ + aic_common_rtc_irq_fixup(); +} + +static void __init at91sam9260_aic_irq_fixup(void) +{ + aic_common_rtt_irq_fixup(); +} + +static void __init at91sam9g45_aic_irq_fixup(void) +{ + aic_common_rtc_irq_fixup(); + aic_common_rtt_irq_fixup(); +} + +static const struct of_device_id aic_irq_fixups[] __initconst = { + { .compatible = "atmel,at91rm9200", .data = at91rm9200_aic_irq_fixup }, + { .compatible = "atmel,at91sam9g45", .data = at91sam9g45_aic_irq_fixup }, + { .compatible = "atmel,at91sam9n12", .data = at91rm9200_aic_irq_fixup }, + { .compatible = "atmel,at91sam9rl", .data = at91sam9g45_aic_irq_fixup }, + { .compatible = "atmel,at91sam9x5", .data = at91rm9200_aic_irq_fixup }, + { .compatible = "atmel,at91sam9260", .data = at91sam9260_aic_irq_fixup }, + { .compatible = "atmel,at91sam9261", .data = at91sam9260_aic_irq_fixup }, + { .compatible = "atmel,at91sam9263", .data = at91sam9260_aic_irq_fixup }, + { .compatible = "atmel,at91sam9g20", .data = at91sam9260_aic_irq_fixup }, + { /* sentinel */ }, +}; + +static int __init aic_of_init(struct device_node *node, + struct device_node *parent) +{ + struct irq_chip_generic *gc; + struct irq_domain *domain; + + if (aic_domain) + return -EEXIST; + + domain = aic_common_of_init(node, &aic_irq_ops, "atmel-aic", + NR_AIC_IRQS, aic_irq_fixups); + if (IS_ERR(domain)) + return PTR_ERR(domain); + + aic_domain = domain; + gc = irq_get_domain_generic_chip(domain, 0); + + gc->chip_types[0].regs.eoi = AT91_AIC_EOICR; + gc->chip_types[0].regs.enable = AT91_AIC_IECR; + gc->chip_types[0].regs.disable = AT91_AIC_IDCR; + gc->chip_types[0].chip.irq_mask = irq_gc_mask_disable_reg; + gc->chip_types[0].chip.irq_unmask = irq_gc_unmask_enable_reg; + gc->chip_types[0].chip.irq_retrigger = aic_retrigger; + gc->chip_types[0].chip.irq_set_type = aic_set_type; + gc->chip_types[0].chip.irq_suspend = aic_suspend; + gc->chip_types[0].chip.irq_resume = aic_resume; + gc->chip_types[0].chip.irq_pm_shutdown = aic_pm_shutdown; + + aic_hw_init(domain); + set_handle_irq(aic_handle); + + return 0; +} +IRQCHIP_DECLARE(at91rm9200_aic, "atmel,at91rm9200-aic", aic_of_init); |