+++ /dev/null
-/*
- * arch/arm/mach-vt8500/irq.c
- *
- * Copyright (C) 2012 Tony Prisk <linux@prisktech.co.nz>
- * Copyright (C) 2010 Alexey Charkov <alchark@gmail.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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
- */
-
-/*
- * This file is copied and modified from the original irq.c provided by
- * Alexey Charkov. Minor changes have been made for Device Tree Support.
- */
-
-#include <linux/slab.h>
-#include <linux/io.h>
-#include <linux/irq.h>
-#include <linux/irqdomain.h>
-#include <linux/interrupt.h>
-#include <linux/bitops.h>
-
-#include <linux/of.h>
-#include <linux/of_irq.h>
-#include <linux/of_address.h>
-
-#include <asm/irq.h>
-#include <asm/exception.h>
-
-#define VT8500_ICPC_IRQ 0x20
-#define VT8500_ICPC_FIQ 0x24
-#define VT8500_ICDC 0x40 /* Destination Control 64*u32 */
-#define VT8500_ICIS 0x80 /* Interrupt status, 16*u32 */
-
-/* ICPC */
-#define ICPC_MASK 0x3F
-#define ICPC_ROTATE BIT(6)
-
-/* IC_DCTR */
-#define ICDC_IRQ 0x00
-#define ICDC_FIQ 0x01
-#define ICDC_DSS0 0x02
-#define ICDC_DSS1 0x03
-#define ICDC_DSS2 0x04
-#define ICDC_DSS3 0x05
-#define ICDC_DSS4 0x06
-#define ICDC_DSS5 0x07
-
-#define VT8500_INT_DISABLE 0
-#define VT8500_INT_ENABLE BIT(3)
-
-#define VT8500_TRIGGER_HIGH 0
-#define VT8500_TRIGGER_RISING BIT(5)
-#define VT8500_TRIGGER_FALLING BIT(6)
-#define VT8500_EDGE ( VT8500_TRIGGER_RISING \
- | VT8500_TRIGGER_FALLING)
-
-/* vt8500 has 1 intc, wm8505 and wm8650 have 2 */
-#define VT8500_INTC_MAX 2
-
-struct vt8500_irq_data {
- void __iomem *base; /* IO Memory base address */
- struct irq_domain *domain; /* Domain for this controller */
-};
-
-/* Global variable for accessing io-mem addresses */
-static struct vt8500_irq_data intc[VT8500_INTC_MAX];
-static u32 active_cnt = 0;
-
-static void vt8500_irq_mask(struct irq_data *d)
-{
- struct vt8500_irq_data *priv = d->domain->host_data;
- void __iomem *base = priv->base;
- void __iomem *stat_reg = base + VT8500_ICIS + (d->hwirq < 32 ? 0 : 4);
- u8 edge, dctr;
- u32 status;
-
- edge = readb(base + VT8500_ICDC + d->hwirq) & VT8500_EDGE;
- if (edge) {
- status = readl(stat_reg);
-
- status |= (1 << (d->hwirq & 0x1f));
- writel(status, stat_reg);
- } else {
- dctr = readb(base + VT8500_ICDC + d->hwirq);
- dctr &= ~VT8500_INT_ENABLE;
- writeb(dctr, base + VT8500_ICDC + d->hwirq);
- }
-}
-
-static void vt8500_irq_unmask(struct irq_data *d)
-{
- struct vt8500_irq_data *priv = d->domain->host_data;
- void __iomem *base = priv->base;
- u8 dctr;
-
- dctr = readb(base + VT8500_ICDC + d->hwirq);
- dctr |= VT8500_INT_ENABLE;
- writeb(dctr, base + VT8500_ICDC + d->hwirq);
-}
-
-static int vt8500_irq_set_type(struct irq_data *d, unsigned int flow_type)
-{
- struct vt8500_irq_data *priv = d->domain->host_data;
- void __iomem *base = priv->base;
- u8 dctr;
-
- dctr = readb(base + VT8500_ICDC + d->hwirq);
- dctr &= ~VT8500_EDGE;
-
- switch (flow_type) {
- case IRQF_TRIGGER_LOW:
- return -EINVAL;
- case IRQF_TRIGGER_HIGH:
- dctr |= VT8500_TRIGGER_HIGH;
- __irq_set_handler_locked(d->irq, handle_level_irq);
- break;
- case IRQF_TRIGGER_FALLING:
- dctr |= VT8500_TRIGGER_FALLING;
- __irq_set_handler_locked(d->irq, handle_edge_irq);
- break;
- case IRQF_TRIGGER_RISING:
- dctr |= VT8500_TRIGGER_RISING;
- __irq_set_handler_locked(d->irq, handle_edge_irq);
- break;
- }
- writeb(dctr, base + VT8500_ICDC + d->hwirq);
-
- return 0;
-}
-
-static struct irq_chip vt8500_irq_chip = {
- .name = "vt8500",
- .irq_ack = vt8500_irq_mask,
- .irq_mask = vt8500_irq_mask,
- .irq_unmask = vt8500_irq_unmask,
- .irq_set_type = vt8500_irq_set_type,
-};
-
-static void __init vt8500_init_irq_hw(void __iomem *base)
-{
- u32 i;
-
- /* Enable rotating priority for IRQ */
- writel(ICPC_ROTATE, base + VT8500_ICPC_IRQ);
- writel(0x00, base + VT8500_ICPC_FIQ);
-
- /* Disable all interrupts and route them to IRQ */
- for (i = 0; i < 64; i++)
- writeb(VT8500_INT_DISABLE | ICDC_IRQ, base + VT8500_ICDC + i);
-}
-
-static int vt8500_irq_map(struct irq_domain *h, unsigned int virq,
- irq_hw_number_t hw)
-{
- irq_set_chip_and_handler(virq, &vt8500_irq_chip, handle_level_irq);
- set_irq_flags(virq, IRQF_VALID);
-
- return 0;
-}
-
-static struct irq_domain_ops vt8500_irq_domain_ops = {
- .map = vt8500_irq_map,
- .xlate = irq_domain_xlate_onecell,
-};
-
-asmlinkage void __exception_irq_entry vt8500_handle_irq(struct pt_regs *regs)
-{
- u32 stat, i;
- int irqnr, virq;
- void __iomem *base;
-
- /* Loop through each active controller */
- for (i=0; i<active_cnt; i++) {
- base = intc[i].base;
- irqnr = readl_relaxed(base) & 0x3F;
- /*
- Highest Priority register default = 63, so check that this
- is a real interrupt by checking the status register
- */
- if (irqnr == 63) {
- stat = readl_relaxed(base + VT8500_ICIS + 4);
- if (!(stat & BIT(31)))
- continue;
- }
-
- virq = irq_find_mapping(intc[i].domain, irqnr);
- handle_IRQ(virq, regs);
- }
-}
-
-int __init vt8500_irq_init(struct device_node *node, struct device_node *parent)
-{
- int irq, i;
- struct device_node *np = node;
-
- if (active_cnt == VT8500_INTC_MAX) {
- pr_err("%s: Interrupt controllers > VT8500_INTC_MAX\n",
- __func__);
- goto out;
- }
-
- intc[active_cnt].base = of_iomap(np, 0);
- intc[active_cnt].domain = irq_domain_add_linear(node, 64,
- &vt8500_irq_domain_ops, &intc[active_cnt]);
-
- if (!intc[active_cnt].base) {
- pr_err("%s: Unable to map IO memory\n", __func__);
- goto out;
- }
-
- if (!intc[active_cnt].domain) {
- pr_err("%s: Unable to add irq domain!\n", __func__);
- goto out;
- }
-
- vt8500_init_irq_hw(intc[active_cnt].base);
-
- pr_info("vt8500-irq: Added interrupt controller\n");
-
- active_cnt++;
-
- /* check if this is a slaved controller */
- if (of_irq_count(np) != 0) {
- /* check that we have the correct number of interrupts */
- if (of_irq_count(np) != 8) {
- pr_err("%s: Incorrect IRQ map for slaved controller\n",
- __func__);
- return -EINVAL;
- }
-
- for (i = 0; i < 8; i++) {
- irq = irq_of_parse_and_map(np, i);
- enable_irq(irq);
- }
-
- pr_info("vt8500-irq: Enabled slave->parent interrupts\n");
- }
-out:
- return 0;
-}
-
projects / firefly-linux-kernel-4.4.55.git / blobdiff