279 lines
6.3 KiB
C
279 lines
6.3 KiB
C
/*
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* Copyright (C) 2015 Freescale Semiconductor, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#include <linux/irqchip.h>
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#include <linux/syscore_ops.h>
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#define IMR_NUM 4
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#define GPC_MAX_IRQS (IMR_NUM * 32)
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#define GPC_IMR1_CORE0 0x30
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#define GPC_IMR1_CORE1 0x40
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struct gpcv2_irqchip_data {
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struct raw_spinlock rlock;
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void __iomem *gpc_base;
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u32 wakeup_sources[IMR_NUM];
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u32 saved_irq_mask[IMR_NUM];
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u32 cpu2wakeup;
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};
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static struct gpcv2_irqchip_data *imx_gpcv2_instance;
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/*
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* Interface for the low level wakeup code.
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*/
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u32 imx_gpcv2_get_wakeup_source(u32 **sources)
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{
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if (!imx_gpcv2_instance)
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return 0;
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if (sources)
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*sources = imx_gpcv2_instance->wakeup_sources;
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return IMR_NUM;
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}
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static int gpcv2_wakeup_source_save(void)
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{
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struct gpcv2_irqchip_data *cd;
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void __iomem *reg;
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int i;
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cd = imx_gpcv2_instance;
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if (!cd)
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return 0;
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for (i = 0; i < IMR_NUM; i++) {
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reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
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cd->saved_irq_mask[i] = readl_relaxed(reg);
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writel_relaxed(cd->wakeup_sources[i], reg);
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}
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return 0;
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}
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static void gpcv2_wakeup_source_restore(void)
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{
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struct gpcv2_irqchip_data *cd;
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void __iomem *reg;
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int i;
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cd = imx_gpcv2_instance;
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if (!cd)
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return;
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for (i = 0; i < IMR_NUM; i++) {
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reg = cd->gpc_base + cd->cpu2wakeup + i * 4;
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writel_relaxed(cd->saved_irq_mask[i], reg);
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}
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}
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static struct syscore_ops imx_gpcv2_syscore_ops = {
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.suspend = gpcv2_wakeup_source_save,
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.resume = gpcv2_wakeup_source_restore,
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};
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static int imx_gpcv2_irq_set_wake(struct irq_data *d, unsigned int on)
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{
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struct gpcv2_irqchip_data *cd = d->chip_data;
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unsigned int idx = d->hwirq / 32;
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unsigned long flags;
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void __iomem *reg;
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u32 mask, val;
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raw_spin_lock_irqsave(&cd->rlock, flags);
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reg = cd->gpc_base + cd->cpu2wakeup + idx * 4;
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mask = 1 << d->hwirq % 32;
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val = cd->wakeup_sources[idx];
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cd->wakeup_sources[idx] = on ? (val & ~mask) : (val | mask);
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raw_spin_unlock_irqrestore(&cd->rlock, flags);
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/*
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* Do *not* call into the parent, as the GIC doesn't have any
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* wake-up facility...
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*/
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return 0;
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}
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static void imx_gpcv2_irq_unmask(struct irq_data *d)
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{
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struct gpcv2_irqchip_data *cd = d->chip_data;
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void __iomem *reg;
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u32 val;
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raw_spin_lock(&cd->rlock);
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reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
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val = readl_relaxed(reg);
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val &= ~(1 << d->hwirq % 32);
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writel_relaxed(val, reg);
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raw_spin_unlock(&cd->rlock);
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irq_chip_unmask_parent(d);
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}
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static void imx_gpcv2_irq_mask(struct irq_data *d)
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{
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struct gpcv2_irqchip_data *cd = d->chip_data;
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void __iomem *reg;
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u32 val;
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raw_spin_lock(&cd->rlock);
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reg = cd->gpc_base + cd->cpu2wakeup + d->hwirq / 32 * 4;
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val = readl_relaxed(reg);
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val |= 1 << (d->hwirq % 32);
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writel_relaxed(val, reg);
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raw_spin_unlock(&cd->rlock);
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irq_chip_mask_parent(d);
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}
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static struct irq_chip gpcv2_irqchip_data_chip = {
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.name = "GPCv2",
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.irq_eoi = irq_chip_eoi_parent,
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.irq_mask = imx_gpcv2_irq_mask,
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.irq_unmask = imx_gpcv2_irq_unmask,
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.irq_set_wake = imx_gpcv2_irq_set_wake,
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.irq_retrigger = irq_chip_retrigger_hierarchy,
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#ifdef CONFIG_SMP
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.irq_set_affinity = irq_chip_set_affinity_parent,
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#endif
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};
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static int imx_gpcv2_domain_xlate(struct irq_domain *domain,
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struct device_node *controller,
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const u32 *intspec,
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unsigned int intsize,
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unsigned long *out_hwirq,
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unsigned int *out_type)
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{
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/* Shouldn't happen, really... */
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if (domain->of_node != controller)
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return -EINVAL;
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/* Not GIC compliant */
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if (intsize != 3)
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return -EINVAL;
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/* No PPI should point to this domain */
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if (intspec[0] != 0)
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return -EINVAL;
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*out_hwirq = intspec[1];
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*out_type = intspec[2];
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return 0;
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}
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static int imx_gpcv2_domain_alloc(struct irq_domain *domain,
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unsigned int irq, unsigned int nr_irqs,
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void *data)
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{
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struct of_phandle_args *args = data;
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struct of_phandle_args parent_args;
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irq_hw_number_t hwirq;
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int i;
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/* Not GIC compliant */
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if (args->args_count != 3)
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return -EINVAL;
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/* No PPI should point to this domain */
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if (args->args[0] != 0)
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return -EINVAL;
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/* Can't deal with this */
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hwirq = args->args[1];
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if (hwirq >= GPC_MAX_IRQS)
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return -EINVAL;
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for (i = 0; i < nr_irqs; i++) {
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irq_domain_set_hwirq_and_chip(domain, irq + i, hwirq + i,
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&gpcv2_irqchip_data_chip, domain->host_data);
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}
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parent_args = *args;
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parent_args.np = domain->parent->of_node;
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return irq_domain_alloc_irqs_parent(domain, irq, nr_irqs, &parent_args);
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}
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static struct irq_domain_ops gpcv2_irqchip_data_domain_ops = {
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.xlate = imx_gpcv2_domain_xlate,
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.alloc = imx_gpcv2_domain_alloc,
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.free = irq_domain_free_irqs_common,
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};
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static int __init imx_gpcv2_irqchip_init(struct device_node *node,
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struct device_node *parent)
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{
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struct irq_domain *parent_domain, *domain;
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struct gpcv2_irqchip_data *cd;
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int i;
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if (!parent) {
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pr_err("%s: no parent, giving up\n", node->full_name);
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return -ENODEV;
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}
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parent_domain = irq_find_host(parent);
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if (!parent_domain) {
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pr_err("%s: unable to get parent domain\n", node->full_name);
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return -ENXIO;
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}
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cd = kzalloc(sizeof(struct gpcv2_irqchip_data), GFP_KERNEL);
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if (!cd) {
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pr_err("kzalloc failed!\n");
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return -ENOMEM;
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}
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cd->gpc_base = of_iomap(node, 0);
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if (!cd->gpc_base) {
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pr_err("fsl-gpcv2: unable to map gpc registers\n");
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kfree(cd);
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return -ENOMEM;
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}
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domain = irq_domain_add_hierarchy(parent_domain, 0, GPC_MAX_IRQS,
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node, &gpcv2_irqchip_data_domain_ops, cd);
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if (!domain) {
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iounmap(cd->gpc_base);
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kfree(cd);
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return -ENOMEM;
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}
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irq_set_default_host(domain);
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/* Initially mask all interrupts */
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for (i = 0; i < IMR_NUM; i++) {
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writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE0 + i * 4);
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writel_relaxed(~0, cd->gpc_base + GPC_IMR1_CORE1 + i * 4);
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cd->wakeup_sources[i] = ~0;
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}
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/* Let CORE0 as the default CPU to wake up by GPC */
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cd->cpu2wakeup = GPC_IMR1_CORE0;
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/*
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* Due to hardware design failure, need to make sure GPR
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* interrupt(#32) is unmasked during RUN mode to avoid entering
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* DSM by mistake.
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*/
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writel_relaxed(~0x1, cd->gpc_base + cd->cpu2wakeup);
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imx_gpcv2_instance = cd;
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register_syscore_ops(&imx_gpcv2_syscore_ops);
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return 0;
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}
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IRQCHIP_DECLARE(imx_gpcv2, "fsl,imx7d-gpc", imx_gpcv2_irqchip_init);
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