[PATCH v4 3/7] irqchip: atmel-aic: Add atmel AIC/AIC5 drivers
From: Boris BREZILLON
Date: Thu Jul 10 2014 - 13:14:41 EST
Add AIC (Advanced Interrupt Controller) and AIC5 (AIC5 is an evolution of
the AIC block) drivers.
Put common code in irq-atmel-aic-common.c/.h so that both driver can access
shared functions (this will ease maintenance).
These drivers are only compatible with dt enabled board and replace the
old implementation found in arch/arm/mach-at91/irq.c.
Signed-off-by: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxx>
---
drivers/irqchip/Kconfig | 14 ++
drivers/irqchip/Makefile | 2 +
drivers/irqchip/irq-atmel-aic-common.c | 207 ++++++++++++++++++++
drivers/irqchip/irq-atmel-aic-common.h | 35 ++++
drivers/irqchip/irq-atmel-aic.c | 247 ++++++++++++++++++++++++
drivers/irqchip/irq-atmel-aic5.c | 341 +++++++++++++++++++++++++++++++++
6 files changed, 846 insertions(+)
create mode 100644 drivers/irqchip/irq-atmel-aic-common.c
create mode 100644 drivers/irqchip/irq-atmel-aic-common.h
create mode 100644 drivers/irqchip/irq-atmel-aic.c
create mode 100644 drivers/irqchip/irq-atmel-aic5.c
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index bbb746e..baa32cc 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -30,6 +30,20 @@ config ARM_VIC_NR
The maximum number of VICs available in the system, for
power management.
+config ATMEL_AIC_IRQ
+ bool
+ select GENERIC_IRQ_CHIP
+ select IRQ_DOMAIN
+ select MULTI_IRQ_HANDLER
+ select SPARSE_IRQ
+
+config ATMEL_AIC5_IRQ
+ bool
+ select GENERIC_IRQ_CHIP
+ select IRQ_DOMAIN
+ select MULTI_IRQ_HANDLER
+ select SPARSE_IRQ
+
config BRCMSTB_L2_IRQ
bool
depends on ARM
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index 62a13e5..674e895 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -18,6 +18,8 @@ obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o
obj-$(CONFIG_ARM_GIC) += irq-gic.o
obj-$(CONFIG_ARM_NVIC) += irq-nvic.o
obj-$(CONFIG_ARM_VIC) += irq-vic.o
+obj-$(CONFIG_ATMEL_AIC_IRQ) += irq-atmel-aic-common.o irq-atmel-aic.o
+obj-$(CONFIG_ATMEL_AIC5_IRQ) += irq-atmel-aic-common.o irq-atmel-aic5.o
obj-$(CONFIG_IMGPDC_IRQ) += irq-imgpdc.o
obj-$(CONFIG_SIRF_IRQ) += irq-sirfsoc.o
obj-$(CONFIG_RENESAS_INTC_IRQPIN) += irq-renesas-intc-irqpin.o
diff --git a/drivers/irqchip/irq-atmel-aic-common.c b/drivers/irqchip/irq-atmel-aic-common.c
new file mode 100644
index 0000000..18b76fc
--- /dev/null
+++ b/drivers/irqchip/irq-atmel-aic-common.c
@@ -0,0 +1,207 @@
+/*
+ * Atmel AT91 common AIC (Advanced Interrupt Controller) code shared by
+ * irq-atmel-aic and irq-atmel-aic5 drivers
+ *
+ * Copyright (C) 2004 SAN People
+ * Copyright (C) 2004 ATMEL
+ * Copyright (C) Rick Bronson
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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/errno.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/slab.h>
+
+#include "irq-atmel-aic-common.h"
+
+#define AT91_AIC_PRIOR GENMASK(2, 0)
+#define AT91_AIC_IRQ_MIN_PRIORITY 0
+#define AT91_AIC_IRQ_MAX_PRIORITY 7
+
+#define AT91_AIC_SRCTYPE GENMASK(7, 6)
+#define AT91_AIC_SRCTYPE_LOW (0 << 5)
+#define AT91_AIC_SRCTYPE_FALLING (1 << 5)
+#define AT91_AIC_SRCTYPE_HIGH (2 << 5)
+#define AT91_AIC_SRCTYPE_RISING (3 << 5)
+
+struct aic_chip_data {
+ u32 ext_irqs;
+};
+
+static void aic_common_shutdown(struct irq_data *d)
+{
+ struct irq_chip_type *ct = irq_data_get_chip_type(d);
+
+ ct->chip.irq_mask(d);
+}
+
+int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val)
+{
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ struct aic_chip_data *aic = gc->private;
+ unsigned aic_type;
+
+ switch (type) {
+ case IRQ_TYPE_LEVEL_HIGH:
+ aic_type = AT91_AIC_SRCTYPE_HIGH;
+ break;
+ case IRQ_TYPE_EDGE_RISING:
+ aic_type = AT91_AIC_SRCTYPE_RISING;
+ break;
+ case IRQ_TYPE_LEVEL_LOW:
+ if (!(d->mask & aic->ext_irqs))
+ return -EINVAL;
+
+ aic_type = AT91_AIC_SRCTYPE_LOW;
+ break;
+ case IRQ_TYPE_EDGE_FALLING:
+ if (!(d->mask & aic->ext_irqs))
+ return -EINVAL;
+
+ aic_type = AT91_AIC_SRCTYPE_FALLING;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ *val &= AT91_AIC_SRCTYPE;
+ *val |= aic_type;
+
+ return 0;
+}
+
+int aic_common_set_priority(int priority, unsigned *val)
+{
+ if (priority < AT91_AIC_IRQ_MIN_PRIORITY ||
+ priority > AT91_AIC_IRQ_MAX_PRIORITY)
+ return -EINVAL;
+
+ *val &= AT91_AIC_PRIOR;
+ *val |= priority;
+
+ return 0;
+}
+
+int aic_common_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)
+{
+ if (WARN_ON(intsize < 3))
+ return -EINVAL;
+
+ if (WARN_ON((intspec[2] < AT91_AIC_IRQ_MIN_PRIORITY) ||
+ (intspec[2] > AT91_AIC_IRQ_MAX_PRIORITY)))
+ return -EINVAL;
+
+ *out_hwirq = intspec[0];
+ *out_type = intspec[1] & IRQ_TYPE_SENSE_MASK;
+
+ return 0;
+}
+
+static void __init aic_common_ext_irq_of_init(struct irq_domain *domain)
+{
+ struct device_node *node = domain->of_node;
+ struct irq_chip_generic *gc;
+ struct aic_chip_data *aic;
+ struct property *prop;
+ const __be32 *p;
+ u32 hwirq;
+
+ gc = irq_get_domain_generic_chip(domain, 0);
+
+ aic = gc->private;
+ aic->ext_irqs |= 1;
+
+ of_property_for_each_u32(node, "atmel,external-irqs", prop, p, hwirq) {
+ gc = irq_get_domain_generic_chip(domain, hwirq);
+ if (!gc) {
+ pr_warn("AIC: external irq %d >= %d skip it\n",
+ hwirq, domain->revmap_size);
+ continue;
+ }
+
+ aic = gc->private;
+ aic->ext_irqs |= (1 << (hwirq % 32));
+ }
+}
+
+struct irq_domain *__init aic_common_of_init(struct device_node *node,
+ const struct irq_domain_ops *ops,
+ const char *name, int nirqs)
+{
+ struct irq_chip_generic *gc;
+ struct irq_domain *domain;
+ struct aic_chip_data *aic;
+ void __iomem *reg_base;
+ int nchips;
+ int ret;
+ int i;
+
+ nchips = DIV_ROUND_UP(nirqs, 32);
+
+ reg_base = of_iomap(node, 0);
+ if (!reg_base)
+ return ERR_PTR(-ENOMEM);
+
+ aic = kcalloc(nchips, sizeof(*aic), GFP_KERNEL);
+ if (!aic) {
+ ret = -ENOMEM;
+ goto err_iounmap;
+ }
+
+ domain = irq_domain_add_linear(node, nchips * 32, ops, aic);
+ if (!domain) {
+ ret = -ENOMEM;
+ goto err_free_aic;
+ }
+
+ ret = irq_alloc_domain_generic_chips(domain, 32, 1, name,
+ handle_level_irq, 0, 0,
+ IRQCHIP_SKIP_SET_WAKE);
+ if (ret)
+ goto err_domain_remove;
+
+ for (i = 0; i < nchips; i++) {
+ gc = irq_get_domain_generic_chip(domain, i * 32);
+
+ gc->reg_base = reg_base;
+
+ gc->unused = 0;
+ gc->wake_enabled = ~0;
+ gc->chip_types[0].type = IRQ_TYPE_SENSE_MASK;
+ gc->chip_types[0].handler = handle_fasteoi_irq;
+ gc->chip_types[0].chip.irq_eoi = irq_gc_eoi;
+ gc->chip_types[0].chip.irq_set_wake = irq_gc_set_wake;
+ gc->chip_types[0].chip.irq_shutdown = aic_common_shutdown;
+ gc->private = &aic[i];
+ }
+
+ aic_common_ext_irq_of_init(domain);
+
+ return domain;
+
+err_domain_remove:
+ irq_domain_remove(domain);
+
+err_free_aic:
+ kfree(aic);
+
+err_iounmap:
+ iounmap(reg_base);
+
+ return ERR_PTR(ret);
+}
diff --git a/drivers/irqchip/irq-atmel-aic-common.h b/drivers/irqchip/irq-atmel-aic-common.h
new file mode 100644
index 0000000..c178557
--- /dev/null
+++ b/drivers/irqchip/irq-atmel-aic-common.h
@@ -0,0 +1,35 @@
+/*
+ * Atmel AT91 common AIC (Advanced Interrupt Controller) header file
+ *
+ * Copyright (C) 2004 SAN People
+ * Copyright (C) 2004 ATMEL
+ * Copyright (C) Rick Bronson
+ * Copyright (C) 2014 Free Electrons
+ *
+ * Author: Boris BREZILLON <boris.brezillon@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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.
+ */
+
+#ifndef __IRQ_ATMEL_AIC_COMMON_H
+#define __IRQ_ATMEL_AIC_COMMON_H
+
+
+int aic_common_set_type(struct irq_data *d, unsigned type, unsigned *val);
+
+int aic_common_set_priority(int priority, unsigned *val);
+
+int aic_common_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 *__init aic_common_of_init(struct device_node *node,
+ const struct irq_domain_ops *ops,
+ const char *name, int nirqs);
+
+#endif /* __IRQ_ATMEL_AIC_COMMON_H */
diff --git a/drivers/irqchip/irq-atmel-aic.c b/drivers/irqchip/irq-atmel-aic.c
new file mode 100644
index 0000000..b15b566
--- /dev/null
+++ b/drivers/irqchip/irq-atmel-aic.c
@@ -0,0 +1,247 @@
+/*
+ * 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@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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/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"
+#include "irqchip.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->reg_base + AT91_AIC_IVR);
+ irqstat = irq_reg_readl(gc->reg_base + AT91_AIC_ISR);
+
+ irqnr = irq_find_mapping(aic_domain, irqnr);
+
+ if (!irqstat)
+ irq_reg_writel(0, gc->reg_base + AT91_AIC_EOICR);
+ else
+ handle_IRQ(irqnr, regs);
+}
+
+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(d->mask, gc->reg_base + AT91_AIC_ISCR);
+ irq_gc_unlock(gc);
+
+ return 0;
+}
+
+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->reg_base + AT91_AIC_SMR(d->hwirq));
+ ret = aic_common_set_type(d, type, &smr);
+ if (ret)
+ return ret;
+
+ irq_reg_writel(smr, gc->reg_base + 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->mask_cache, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(gc->wake_active, gc->reg_base + 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->wake_active, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(gc->mask_cache, gc->reg_base + 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(0xffffffff, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(0xffffffff, gc->reg_base + 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(0, gc->reg_base + 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(0xffffffff, gc->reg_base + AT91_AIC_SPU);
+
+ /* No debugging in AIC: Debug (Protect) Control Register */
+ irq_reg_writel(0, gc->reg_base + AT91_AIC_DCR);
+
+ /* Disable and clear all interrupts initially */
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_IDCR);
+ irq_reg_writel(0xffffffff, gc->reg_base + AT91_AIC_ICCR);
+
+ for (i = 0; i < 32; i++)
+ irq_reg_writel(i, gc->reg_base + 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 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(gc);
+ smr = irq_reg_readl(gc->reg_base + AT91_AIC_SMR(*out_hwirq));
+ ret = aic_common_set_priority(intspec[2], &smr);
+ if (!ret)
+ irq_reg_writel(smr, gc->reg_base + AT91_AIC_SMR(*out_hwirq));
+ irq_gc_unlock(gc);
+
+ return ret;
+}
+
+static const struct irq_domain_ops aic_irq_ops = {
+ .map = irq_map_generic_chip,
+ .xlate = aic_irq_domain_xlate,
+};
+
+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);
+ 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);
diff --git a/drivers/irqchip/irq-atmel-aic5.c b/drivers/irqchip/irq-atmel-aic5.c
new file mode 100644
index 0000000..c9c753a
--- /dev/null
+++ b/drivers/irqchip/irq-atmel-aic5.c
@@ -0,0 +1,341 @@
+/*
+ * Atmel AT91 AIC5 (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@xxxxxxxxxxxxxxxxxx>
+ *
+ * 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/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"
+#include "irqchip.h"
+
+/* Number of irq lines managed by AIC */
+#define NR_AIC5_IRQS 128
+
+#define AT91_AIC5_SSR 0x0
+#define AT91_AIC5_INTSEL_MSK (0x7f << 0)
+
+#define AT91_AIC5_SMR 0x4
+
+#define AT91_AIC5_SVR 0x8
+#define AT91_AIC5_IVR 0x10
+#define AT91_AIC5_FVR 0x14
+#define AT91_AIC5_ISR 0x18
+
+#define AT91_AIC5_IPR0 0x20
+#define AT91_AIC5_IPR1 0x24
+#define AT91_AIC5_IPR2 0x28
+#define AT91_AIC5_IPR3 0x2c
+#define AT91_AIC5_IMR 0x30
+#define AT91_AIC5_CISR 0x34
+
+#define AT91_AIC5_IECR 0x40
+#define AT91_AIC5_IDCR 0x44
+#define AT91_AIC5_ICCR 0x48
+#define AT91_AIC5_ISCR 0x4c
+#define AT91_AIC5_EOICR 0x38
+#define AT91_AIC5_SPU 0x3c
+#define AT91_AIC5_DCR 0x6c
+
+#define AT91_AIC5_FFER 0x50
+#define AT91_AIC5_FFDR 0x54
+#define AT91_AIC5_FFSR 0x58
+
+static struct irq_domain *aic5_domain;
+
+static asmlinkage void __exception_irq_entry
+aic5_handle(struct pt_regs *regs)
+{
+ struct irq_domain_chip_generic *dgc = aic5_domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+ u32 irqnr;
+ u32 irqstat;
+
+ irqnr = irq_reg_readl(gc->reg_base + AT91_AIC5_IVR);
+ irqstat = irq_reg_readl(gc->reg_base + AT91_AIC5_ISR);
+
+ irqnr = irq_find_mapping(aic5_domain, irqnr);
+
+ if (!irqstat)
+ irq_reg_writel(0, gc->reg_base + AT91_AIC5_EOICR);
+ else
+ handle_IRQ(irqnr, regs);
+}
+
+static void aic5_mask(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+
+ /* Disable interrupt on AIC5 */
+ irq_gc_lock(gc);
+ irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR);
+ irq_reg_writel(1, gc->reg_base + AT91_AIC5_IDCR);
+ gc->mask_cache &= ~d->mask;
+ irq_gc_unlock(gc);
+}
+
+static void aic5_unmask(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+
+ /* Enable interrupt on AIC5 */
+ irq_gc_lock(gc);
+ irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR);
+ irq_reg_writel(1, gc->reg_base + AT91_AIC5_IECR);
+ gc->mask_cache |= d->mask;
+ irq_gc_unlock(gc);
+}
+
+static int aic5_retrigger(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+
+ /* Enable interrupt on AIC5 */
+ irq_gc_lock(gc);
+ irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR);
+ irq_reg_writel(1, gc->reg_base + AT91_AIC5_ISCR);
+ irq_gc_unlock(gc);
+
+ return 0;
+}
+
+static int aic5_set_type(struct irq_data *d, unsigned type)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *gc = dgc->gc[0];
+ unsigned int smr;
+ int ret;
+
+ irq_gc_lock(gc);
+ irq_reg_writel(d->hwirq, gc->reg_base + AT91_AIC5_SSR);
+ smr = irq_reg_readl(gc->reg_base + AT91_AIC5_SMR);
+ ret = aic_common_set_type(d, type, &smr);
+ if (!ret)
+ irq_reg_writel(smr, gc->reg_base + AT91_AIC5_SMR);
+ irq_gc_unlock(gc);
+
+ return ret;
+}
+
+#ifdef CONFIG_PM
+static void aic5_suspend(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *bgc = dgc->gc[0];
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ int i;
+ u32 mask;
+
+ irq_gc_lock(bgc);
+ for (i = 0; i < dgc->irqs_per_chip; i++) {
+ mask = 1 << i;
+ if ((mask & gc->mask_cache) == (mask & gc->wake_active))
+ continue;
+
+ irq_reg_writel(i + gc->irq_base,
+ bgc->reg_base + AT91_AIC5_SSR);
+ if (mask & gc->wake_active)
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IECR);
+ else
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR);
+ }
+ irq_gc_unlock(bgc);
+}
+
+static void aic5_resume(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *bgc = dgc->gc[0];
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ int i;
+ u32 mask;
+
+ irq_gc_lock(bgc);
+ for (i = 0; i < dgc->irqs_per_chip; i++) {
+ mask = 1 << i;
+ if ((mask & gc->mask_cache) == (mask & gc->wake_active))
+ continue;
+
+ irq_reg_writel(i + gc->irq_base,
+ bgc->reg_base + AT91_AIC5_SSR);
+ if (mask & gc->mask_cache)
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IECR);
+ else
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR);
+ }
+ irq_gc_unlock(bgc);
+}
+
+static void aic5_pm_shutdown(struct irq_data *d)
+{
+ struct irq_domain *domain = d->domain;
+ struct irq_domain_chip_generic *dgc = domain->gc;
+ struct irq_chip_generic *bgc = dgc->gc[0];
+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(d);
+ int i;
+
+ irq_gc_lock(bgc);
+ for (i = 0; i < dgc->irqs_per_chip; i++) {
+ irq_reg_writel(i + gc->irq_base,
+ bgc->reg_base + AT91_AIC5_SSR);
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_IDCR);
+ irq_reg_writel(1, bgc->reg_base + AT91_AIC5_ICCR);
+ }
+ irq_gc_unlock(bgc);
+}
+#else
+#define aic5_suspend NULL
+#define aic5_resume NULL
+#define aic5_pm_shutdown NULL
+#endif /* CONFIG_PM */
+
+static void __init aic5_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(0, gc->reg_base + AT91_AIC5_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(0xffffffff, gc->reg_base + AT91_AIC5_SPU);
+
+ /* No debugging in AIC: Debug (Protect) Control Register */
+ irq_reg_writel(0, gc->reg_base + AT91_AIC5_DCR);
+
+ /* Disable and clear all interrupts initially */
+ for (i = 0; i < domain->revmap_size; i++) {
+ irq_reg_writel(i, gc->reg_base + AT91_AIC5_SSR);
+ irq_reg_writel(i, gc->reg_base + AT91_AIC5_SVR);
+ irq_reg_writel(1, gc->reg_base + AT91_AIC5_IDCR);
+ irq_reg_writel(1, gc->reg_base + AT91_AIC5_ICCR);
+ }
+}
+
+static int aic5_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 smr;
+ int ret;
+
+ if (!dgc)
+ return -EINVAL;
+
+ ret = aic_common_irq_domain_xlate(d, ctrlr, intspec, intsize,
+ out_hwirq, out_type);
+ if (ret)
+ return ret;
+
+ gc = dgc->gc[0];
+
+ irq_gc_lock(gc);
+ irq_reg_writel(*out_hwirq, gc->reg_base + AT91_AIC5_SSR);
+ smr = irq_reg_readl(gc->reg_base + AT91_AIC5_SMR);
+ ret = aic_common_set_priority(intspec[2], &smr);
+ if (!ret)
+ irq_reg_writel(intspec[2] | smr, gc->reg_base + AT91_AIC5_SMR);
+ irq_gc_unlock(gc);
+
+ return ret;
+}
+
+static const struct irq_domain_ops aic5_irq_ops = {
+ .map = irq_map_generic_chip,
+ .xlate = aic5_irq_domain_xlate,
+};
+
+static int __init aic5_of_init(struct device_node *node,
+ struct device_node *parent,
+ int nirqs)
+{
+ struct irq_chip_generic *gc;
+ struct irq_domain *domain;
+ int nchips;
+ int i;
+
+ if (nirqs > NR_AIC5_IRQS)
+ return -EINVAL;
+
+ if (aic5_domain)
+ return -EEXIST;
+
+ domain = aic_common_of_init(node, &aic5_irq_ops, "atmel-aic5",
+ nirqs);
+ if (IS_ERR(domain))
+ return PTR_ERR(domain);
+
+ aic5_domain = domain;
+ nchips = aic5_domain->revmap_size / 32;
+ for (i = 0; i < nchips; i++) {
+ gc = irq_get_domain_generic_chip(domain, i * 32);
+
+ gc->chip_types[0].regs.eoi = AT91_AIC5_EOICR;
+ gc->chip_types[0].chip.irq_mask = aic5_mask;
+ gc->chip_types[0].chip.irq_unmask = aic5_unmask;
+ gc->chip_types[0].chip.irq_retrigger = aic5_retrigger;
+ gc->chip_types[0].chip.irq_set_type = aic5_set_type;
+ gc->chip_types[0].chip.irq_suspend = aic5_suspend;
+ gc->chip_types[0].chip.irq_resume = aic5_resume;
+ gc->chip_types[0].chip.irq_pm_shutdown = aic5_pm_shutdown;
+ }
+
+ aic5_hw_init(domain);
+ set_handle_irq(aic5_handle);
+
+ return 0;
+}
+
+#define NR_SAMA5D3_IRQS 50
+
+static int __init sama5d3_aic5_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ return aic5_of_init(node, parent, NR_SAMA5D3_IRQS);
+}
+IRQCHIP_DECLARE(sama5d3_aic5, "atmel,sama5d3-aic", sama5d3_aic5_of_init);
--
1.8.3.2
--
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