240 lines
7.0 KiB
Diff
240 lines
7.0 KiB
Diff
From b9ad0253e6c68ac3d37fd2ed8ed9bf8a334e4b65 Mon Sep 17 00:00:00 2001
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From: Carlo Caione <carlo@caione.org>
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Date: Sat, 15 Mar 2014 14:40:59 +0100
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Subject: [PATCH] ARM: sun7i/sun6i: irqchip: Add irqchip driver for NMI
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controller
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Allwinner A20/A31 SoCs have special registers to control / (un)mask /
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acknowledge NMI. This NMI controller is separated and independent from GIC.
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This patch adds a new irqchip to manage NMI.
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Signed-off-by: Carlo Caione <carlo@caione.org>
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Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
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---
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drivers/irqchip/Makefile | 1 +
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drivers/irqchip/irq-sunxi-nmi.c | 208 ++++++++++++++++++++++++++++++++++++++++
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2 files changed, 209 insertions(+)
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create mode 100644 drivers/irqchip/irq-sunxi-nmi.c
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--- a/drivers/irqchip/Makefile
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+++ b/drivers/irqchip/Makefile
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@@ -12,6 +12,7 @@ obj-$(CONFIG_METAG_PERFCOUNTER_IRQS) +=
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obj-$(CONFIG_ARCH_MOXART) += irq-moxart.o
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obj-$(CONFIG_ORION_IRQCHIP) += irq-orion.o
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obj-$(CONFIG_ARCH_SUNXI) += irq-sun4i.o
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+obj-$(CONFIG_ARCH_SUNXI) += irq-sunxi-nmi.o
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obj-$(CONFIG_ARCH_SPEAR3XX) += spear-shirq.o
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obj-$(CONFIG_ARM_GIC) += irq-gic.o
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obj-$(CONFIG_ARM_NVIC) += irq-nvic.o
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--- /dev/null
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+++ b/drivers/irqchip/irq-sunxi-nmi.c
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@@ -0,0 +1,208 @@
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+/*
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+ * Allwinner A20/A31 SoCs NMI IRQ chip driver.
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+ *
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+ * Carlo Caione <carlo.caione@gmail.com>
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+ *
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+ * This file is licensed under the terms of the GNU General Public
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+ * License version 2. This program is licensed "as is" without any
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+ * warranty of any kind, whether express or implied.
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+ */
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+
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+#include <linux/bitops.h>
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+#include <linux/device.h>
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+#include <linux/io.h>
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+#include <linux/irq.h>
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+#include <linux/interrupt.h>
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+#include <linux/irqdomain.h>
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+#include <linux/of_irq.h>
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+#include <linux/of_address.h>
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+#include <linux/of_platform.h>
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+#include <linux/irqchip/chained_irq.h>
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+#include "irqchip.h"
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+
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+#define SUNXI_NMI_SRC_TYPE_MASK 0x00000003
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+
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+enum {
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+ SUNXI_SRC_TYPE_LEVEL_LOW = 0,
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+ SUNXI_SRC_TYPE_EDGE_FALLING,
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+ SUNXI_SRC_TYPE_LEVEL_HIGH,
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+ SUNXI_SRC_TYPE_EDGE_RISING,
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+};
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+
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+struct sunxi_sc_nmi_reg_offs {
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+ u32 ctrl;
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+ u32 pend;
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+ u32 enable;
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+};
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+
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+static struct sunxi_sc_nmi_reg_offs sun7i_reg_offs = {
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+ .ctrl = 0x00,
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+ .pend = 0x04,
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+ .enable = 0x08,
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+};
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+
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+static struct sunxi_sc_nmi_reg_offs sun6i_reg_offs = {
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+ .ctrl = 0x00,
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+ .pend = 0x04,
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+ .enable = 0x34,
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+};
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+
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+static inline void sunxi_sc_nmi_write(struct irq_chip_generic *gc, u32 off,
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+ u32 val)
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+{
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+ irq_reg_writel(val, gc->reg_base + off);
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+}
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+
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+static inline u32 sunxi_sc_nmi_read(struct irq_chip_generic *gc, u32 off)
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+{
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+ return irq_reg_readl(gc->reg_base + off);
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+}
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+
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+static void sunxi_sc_nmi_handle_irq(unsigned int irq, struct irq_desc *desc)
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+{
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+ struct irq_domain *domain = irq_desc_get_handler_data(desc);
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+ struct irq_chip *chip = irq_get_chip(irq);
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+ unsigned int virq = irq_find_mapping(domain, 0);
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+
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+ chained_irq_enter(chip, desc);
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+ generic_handle_irq(virq);
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+ chained_irq_exit(chip, desc);
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+}
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+
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+static int sunxi_sc_nmi_set_type(struct irq_data *data, unsigned int flow_type)
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+{
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+ struct irq_chip_generic *gc = irq_data_get_irq_chip_data(data);
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+ struct irq_chip_type *ct = gc->chip_types;
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+ u32 src_type_reg;
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+ u32 ctrl_off = ct->regs.type;
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+ unsigned int src_type;
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+ unsigned int i;
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+
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+ irq_gc_lock(gc);
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+
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+ switch (flow_type & IRQF_TRIGGER_MASK) {
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+ case IRQ_TYPE_EDGE_FALLING:
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+ src_type = SUNXI_SRC_TYPE_EDGE_FALLING;
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+ break;
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+ case IRQ_TYPE_EDGE_RISING:
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+ src_type = SUNXI_SRC_TYPE_EDGE_RISING;
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+ break;
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+ case IRQ_TYPE_LEVEL_HIGH:
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+ src_type = SUNXI_SRC_TYPE_LEVEL_HIGH;
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+ break;
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+ case IRQ_TYPE_NONE:
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+ case IRQ_TYPE_LEVEL_LOW:
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+ src_type = SUNXI_SRC_TYPE_LEVEL_LOW;
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+ break;
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+ default:
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+ irq_gc_unlock(gc);
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+ pr_err("%s: Cannot assign multiple trigger modes to IRQ %d.\n",
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+ __func__, data->irq);
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+ return -EBADR;
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+ }
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+
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+ irqd_set_trigger_type(data, flow_type);
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+ irq_setup_alt_chip(data, flow_type);
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+
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+ for (i = 0; i <= gc->num_ct; i++, ct++)
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+ if (ct->type & flow_type)
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+ ctrl_off = ct->regs.type;
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+
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+ src_type_reg = sunxi_sc_nmi_read(gc, ctrl_off);
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+ src_type_reg &= ~SUNXI_NMI_SRC_TYPE_MASK;
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+ src_type_reg |= src_type;
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+ sunxi_sc_nmi_write(gc, ctrl_off, src_type_reg);
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+
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+ irq_gc_unlock(gc);
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+
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+ return IRQ_SET_MASK_OK;
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+}
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+
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+static int __init sunxi_sc_nmi_irq_init(struct device_node *node,
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+ struct sunxi_sc_nmi_reg_offs *reg_offs)
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+{
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+ struct irq_domain *domain;
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+ struct irq_chip_generic *gc;
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+ unsigned int irq;
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+ unsigned int clr = IRQ_NOREQUEST | IRQ_NOPROBE | IRQ_NOAUTOEN;
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+ int ret;
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+
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+
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+ domain = irq_domain_add_linear(node, 1, &irq_generic_chip_ops, NULL);
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+ if (!domain) {
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+ pr_err("%s: Could not register interrupt domain.\n", node->name);
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+ return -ENOMEM;
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+ }
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+
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+ ret = irq_alloc_domain_generic_chips(domain, 1, 2, node->name,
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+ handle_fasteoi_irq, clr, 0,
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+ IRQ_GC_INIT_MASK_CACHE);
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+ if (ret) {
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+ pr_err("%s: Could not allocate generic interrupt chip.\n",
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+ node->name);
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+ goto fail_irqd_remove;
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+ }
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+
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+ irq = irq_of_parse_and_map(node, 0);
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+ if (irq <= 0) {
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+ pr_err("%s: unable to parse irq\n", node->name);
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+ ret = -EINVAL;
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+ goto fail_irqd_remove;
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+ }
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+
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+ gc = irq_get_domain_generic_chip(domain, 0);
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+ gc->reg_base = of_iomap(node, 0);
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+ if (!gc->reg_base) {
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+ pr_err("%s: unable to map resource\n", node->name);
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+ ret = -ENOMEM;
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+ goto fail_irqd_remove;
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+ }
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+
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+ gc->chip_types[0].type = IRQ_TYPE_LEVEL_MASK;
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+ gc->chip_types[0].chip.irq_mask = irq_gc_mask_clr_bit;
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+ gc->chip_types[0].chip.irq_unmask = irq_gc_mask_set_bit;
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+ gc->chip_types[0].chip.irq_eoi = irq_gc_ack_set_bit;
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+ gc->chip_types[0].chip.irq_set_type = sunxi_sc_nmi_set_type;
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+ gc->chip_types[0].chip.flags = IRQCHIP_EOI_THREADED | IRQCHIP_EOI_IF_HANDLED;
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+ gc->chip_types[0].regs.ack = reg_offs->pend;
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+ gc->chip_types[0].regs.mask = reg_offs->enable;
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+ gc->chip_types[0].regs.type = reg_offs->ctrl;
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+
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+ gc->chip_types[1].type = IRQ_TYPE_EDGE_BOTH;
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+ gc->chip_types[1].chip.name = gc->chip_types[0].chip.name;
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+ gc->chip_types[1].chip.irq_ack = irq_gc_ack_set_bit;
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+ gc->chip_types[1].chip.irq_mask = irq_gc_mask_clr_bit;
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+ gc->chip_types[1].chip.irq_unmask = irq_gc_mask_set_bit;
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+ gc->chip_types[1].chip.irq_set_type = sunxi_sc_nmi_set_type;
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+ gc->chip_types[1].regs.ack = reg_offs->pend;
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+ gc->chip_types[1].regs.mask = reg_offs->enable;
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+ gc->chip_types[1].regs.type = reg_offs->ctrl;
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+ gc->chip_types[1].handler = handle_edge_irq;
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+
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+ sunxi_sc_nmi_write(gc, reg_offs->enable, 0);
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+ sunxi_sc_nmi_write(gc, reg_offs->pend, 0x1);
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+
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+ irq_set_handler_data(irq, domain);
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+ irq_set_chained_handler(irq, sunxi_sc_nmi_handle_irq);
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+
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+ return 0;
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+
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+fail_irqd_remove:
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+ irq_domain_remove(domain);
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+
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+ return ret;
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+}
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+
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+static int __init sun6i_sc_nmi_irq_init(struct device_node *node,
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+ struct device_node *parent)
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+{
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+ return sunxi_sc_nmi_irq_init(node, &sun6i_reg_offs);
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+}
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+IRQCHIP_DECLARE(sun6i_sc_nmi, "allwinner,sun6i-a31-sc-nmi", sun6i_sc_nmi_irq_init);
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+
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+static int __init sun7i_sc_nmi_irq_init(struct device_node *node,
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+ struct device_node *parent)
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+{
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+ return sunxi_sc_nmi_irq_init(node, &sun7i_reg_offs);
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+}
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+IRQCHIP_DECLARE(sun7i_sc_nmi, "allwinner,sun7i-a20-sc-nmi", sun7i_sc_nmi_irq_init);
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