[PATCH v3 2/3] irqchip: mtk-cirq: Add mediatek mtk-cirq implement
Youlin Pei
youlin.pei at mediatek.com
Tue Mar 28 22:30:06 PDT 2017
On Fri, 2017-03-24 at 16:22 +0000, Marc Zyngier wrote:
> On 14/02/17 02:56, Youlin Pei wrote:
> > In Mediatek SOCs, the CIRQ is a low power interrupt controller
> > designed to works outside MCUSYS which comprises with Cortex-Ax
> > cores,CCI and GIC.
> >
> > The CIRQ controller is integrated in between MCUSYS( include
> > Cortex-Ax, CCI and GIC ) and interrupt sources as the second
> > level interrupt controller. The external interrupts which outside
> > MCUSYS will feed through CIRQ then bypass to GIC. CIRQ can monitors
> > all edge trigger interupts. When an edge interrupt is triggered,
> > CIRQ can record the status and generate a pulse signal to GIC when
> > flush command executed.
> >
> > When system enters sleep mode, MCUSYS will be turned off to improve
> > power consumption, also GIC is power down. The edge trigger interrupts
> > will be lost in this scenario without CIRQ.
> >
> > This commit provides the CIRQ irqchip implement.
> >
> > Signed-off-by: Youlin Pei <youlin.pei at mediatek.com>
> > ---
> > drivers/irqchip/Makefile | 2 +-
> > drivers/irqchip/irq-mtk-cirq.c | 288 ++++++++++++++++++++++++++++++++++++++++
> > 2 files changed, 289 insertions(+), 1 deletion(-)
> > create mode 100644 drivers/irqchip/irq-mtk-cirq.c
> >
> > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> > index 0e55d94..db9acd1 100644
> > --- a/drivers/irqchip/Makefile
> > +++ b/drivers/irqchip/Makefile
> > @@ -61,7 +61,7 @@ obj-$(CONFIG_BCM7120_L2_IRQ) += irq-bcm7120-l2.o
> > obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o
> > obj-$(CONFIG_KEYSTONE_IRQ) += irq-keystone.o
> > obj-$(CONFIG_MIPS_GIC) += irq-mips-gic.o
> > -obj-$(CONFIG_ARCH_MEDIATEK) += irq-mtk-sysirq.o
> > +obj-$(CONFIG_ARCH_MEDIATEK) += irq-mtk-sysirq.o irq-mtk-cirq.o
> > obj-$(CONFIG_ARCH_DIGICOLOR) += irq-digicolor.o
> > obj-$(CONFIG_RENESAS_H8300H_INTC) += irq-renesas-h8300h.o
> > obj-$(CONFIG_RENESAS_H8S_INTC) += irq-renesas-h8s.o
> > diff --git a/drivers/irqchip/irq-mtk-cirq.c b/drivers/irqchip/irq-mtk-cirq.c
> > new file mode 100644
> > index 0000000..b5cf506
> > --- /dev/null
> > +++ b/drivers/irqchip/irq-mtk-cirq.c
> > @@ -0,0 +1,288 @@
> > +/*
> > + * Copyright (c) 2016 MediaTek Inc.
> > + * Author: Youlin.Pei <youlin.pei at mediatek.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * 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.
> > + */
> > +
> > +#include <linux/interrupt.h>
> > +#include <linux/io.h>
> > +#include <linux/irq.h>
> > +#include <linux/irqchip.h>
> > +#include <linux/irqdomain.h>
> > +#include <linux/of.h>
> > +#include <linux/of_irq.h>
> > +#include <linux/of_address.h>
> > +#include <linux/slab.h>
> > +#include <linux/syscore_ops.h>
> > +
> > +#define CIRQ_ACK 0x40
> > +#define CIRQ_MASK_SET 0xc0
> > +#define CIRQ_MASK_CLR 0x100
> > +#define CIRQ_SENS_SET 0x180
> > +#define CIRQ_SENS_CLR 0x1c0
> > +#define CIRQ_POL_SET 0x240
> > +#define CIRQ_POL_CLR 0x280
> > +#define CIRQ_CONTROL 0x300
> > +
> > +#define CIRQ_EN 0x1
> > +#define CIRQ_EDGE 0x2
> > +#define CIRQ_FLUSH 0x4
> > +
> > +struct mtk_cirq_chip_data {
> > + void __iomem *base;
> > + unsigned int ext_irq_start;
> > + unsigned int ext_irq_end;
> > + struct irq_domain *domain;
> > +};
> > +
> > +static struct mtk_cirq_chip_data *cirq_data;
>
> Question in relation to the sysirq patches that have been queued for
> 4.12: Are we going to see something similar with this driver, where
> you're going to have to support multiple non-contiguous register sets?
> I'd rather have this kind of thing from day one, instead of adding that
> at a later time...
>
> Specially given that the platform that is using this driver does also
> have a sysirq controller.
Hi Marc,
Thanks for your review.
All of the cirq's registers are in continuous space, So no need to
support multiple non-continuous register sets.
>
> > +
> > +static void mtk_cirq_write_mask(struct irq_data *data, unsigned int offset)
> > +{
> > + struct mtk_cirq_chip_data *chip_data = data->chip_data;
> > + unsigned int cirq_num = data->hwirq;
> > + u32 mask = 1 << (cirq_num % 32);
> > +
> > + writel_relaxed(mask, chip_data->base + offset + (cirq_num / 32) * 4);
> > +}
> > +
> > +static void mtk_cirq_mask(struct irq_data *data)
> > +{
> > + mtk_cirq_write_mask(data, CIRQ_MASK_SET);
> > + irq_chip_mask_parent(data);
> > +}
> > +
> > +static void mtk_cirq_unmask(struct irq_data *data)
> > +{
> > + mtk_cirq_write_mask(data, CIRQ_MASK_CLR);
> > + irq_chip_unmask_parent(data);
> > +}
> > +
> > +static int mtk_cirq_set_type(struct irq_data *data, unsigned int type)
> > +{
> > + int ret;
> > +
> > + switch (type & IRQ_TYPE_SENSE_MASK) {
> > + case IRQ_TYPE_EDGE_FALLING:
> > + mtk_cirq_write_mask(data, CIRQ_POL_CLR);
> > + mtk_cirq_write_mask(data, CIRQ_SENS_CLR);
> > + break;
> > + case IRQ_TYPE_EDGE_RISING:
> > + mtk_cirq_write_mask(data, CIRQ_POL_SET);
> > + mtk_cirq_write_mask(data, CIRQ_SENS_CLR);
> > + break;
> > + case IRQ_TYPE_LEVEL_LOW:
> > + mtk_cirq_write_mask(data, CIRQ_POL_CLR);
> > + mtk_cirq_write_mask(data, CIRQ_SENS_SET);
> > + break;
> > + case IRQ_TYPE_LEVEL_HIGH:
> > + mtk_cirq_write_mask(data, CIRQ_POL_SET);
> > + mtk_cirq_write_mask(data, CIRQ_SENS_SET);
> > + break;
> > + default:
> > + break;
> > + }
> > +
> > + data = data->parent_data;
> > + ret = data->chip->irq_set_type(data, type);
> > + return ret;
> > +}
> > +
> > +static struct irq_chip mtk_cirq_chip = {
> > + .name = "MT_CIRQ",
> > + .irq_mask = mtk_cirq_mask,
> > + .irq_unmask = mtk_cirq_unmask,
> > + .irq_eoi = irq_chip_eoi_parent,
> > + .irq_set_type = mtk_cirq_set_type,
> > + .irq_retrigger = irq_chip_retrigger_hierarchy,
> > +#ifdef CONFIG_SMP
> > + .irq_set_affinity = irq_chip_set_affinity_parent,
> > +#endif
> > +};
> > +
> > +static int mtk_cirq_domain_translate(struct irq_domain *d,
> > + struct irq_fwspec *fwspec,
> > + unsigned long *hwirq,
> > + unsigned int *type)
> > +{
> > + if (is_of_node(fwspec->fwnode)) {
> > + if (fwspec->param_count != 3)
> > + return -EINVAL;
> > +
> > + /* No PPI should point to this domain */
> > + if (fwspec->param[0] != 0)
> > + return -EINVAL;
> > +
> > + /* cirq support irq number check */
> > + if (fwspec->param[1] < cirq_data->ext_irq_start ||
> > + fwspec->param[1] > cirq_data->ext_irq_end)
> > + return -EINVAL;
> > +
> > + *hwirq = fwspec->param[1] - cirq_data->ext_irq_start;
> > + *type = fwspec->param[2] & IRQ_TYPE_SENSE_MASK;
> > + return 0;
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +
> > +static int mtk_cirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> > + unsigned int nr_irqs, void *arg)
> > +{
> > + int ret;
> > + irq_hw_number_t hwirq;
> > + unsigned int type;
> > + struct irq_fwspec *fwspec = arg;
> > + struct irq_fwspec parent_fwspec = *fwspec;
> > +
> > + ret = mtk_cirq_domain_translate(domain, fwspec, &hwirq, &type);
> > + if (ret)
> > + return ret;
> > +
> > + if (WARN_ON(nr_irqs != 1))
> > + return -EINVAL;
> > +
> > + irq_domain_set_hwirq_and_chip(domain, virq, hwirq,
> > + &mtk_cirq_chip,
> > + domain->host_data);
> > +
> > + parent_fwspec.fwnode = domain->parent->fwnode;
> > + return irq_domain_alloc_irqs_parent(domain, virq, nr_irqs,
> > + &parent_fwspec);
> > +}
> > +
> > +static const struct irq_domain_ops cirq_domain_ops = {
> > + .translate = mtk_cirq_domain_translate,
> > + .alloc = mtk_cirq_domain_alloc,
> > + .free = irq_domain_free_irqs_common,
> > +};
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static int mtk_cirq_suspend(void)
> > +{
> > + u32 value, mask;
> > + unsigned int irq, hwirq_num;
> > + bool pending, masked;
> > + int i, pendret, maskret;
> > +
> > + hwirq_num = cirq_data->ext_irq_end - cirq_data->ext_irq_start + 1;
> > + for (i = 0; i < hwirq_num; i++) {
> > + irq = irq_find_mapping(cirq_data->domain, i);
> > + if (irq) {
> > + pendret = irq_get_irqchip_state(irq,
> > + IRQCHIP_STATE_PENDING,
> > + &pending);
> > +
> > + maskret = irq_get_irqchip_state(irq,
> > + IRQCHIP_STATE_MASKED,
> > + &masked);
> > +
> > + if (pendret == 0 && maskret == 0 &&
> > + (pending && !masked))
> > + continue;
> > + }
> > +
> > + mask = 1 << (i % 32);
> > + writel_relaxed(mask, cirq_data->base + CIRQ_ACK + (i / 32) * 4);
> > + }
>
> It would be worth documenting exactly what this is for. I had to go back
> to our previous discussion in November to remember it.
Okay, i will add some comments to explain what this is for in next
version. Thanks!
>
> > +
> > + /* set edge_only mode, record edge-triggerd interrupts */
> > + /* enable cirq */
> > + value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
> > + value |= (CIRQ_EDGE | CIRQ_EN);
> > + writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
> > +
> > + return 0;
> > +}
> > +
> > +static void mtk_cirq_resume(void)
> > +{
> > + u32 value;
> > +
> > + /* flush recored interrupts, will send signals to parent controller */
> > + value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
> > + writel_relaxed(value | CIRQ_FLUSH, cirq_data->base + CIRQ_CONTROL);
> > +
> > + /* disable cirq */
> > + value = readl_relaxed(cirq_data->base + CIRQ_CONTROL);
> > + value &= ~(CIRQ_EDGE | CIRQ_EN);
> > + writel_relaxed(value, cirq_data->base + CIRQ_CONTROL);
> > +}
> > +
> > +static struct syscore_ops mtk_cirq_syscore_ops = {
> > + .suspend = mtk_cirq_suspend,
> > + .resume = mtk_cirq_resume,
> > +};
> > +
> > +static void mtk_cirq_syscore_init(void)
> > +{
> > + register_syscore_ops(&mtk_cirq_syscore_ops);
> > +}
> > +#else
> > +static inline void mtk_cirq_syscore_init(void) {}
> > +#endif
> > +
> > +static int __init mtk_cirq_of_init(struct device_node *node,
> > + struct device_node *parent)
> > +{
> > + struct irq_domain *domain, *domain_parent;
> > + unsigned int irq_num;
> > + int ret;
> > +
> > + domain_parent = irq_find_host(parent);
> > + if (!domain_parent) {
> > + pr_err("mtk_cirq: interrupt-parent not found\n");
> > + return -EINVAL;
> > + }
> > +
> > + cirq_data = kzalloc(sizeof(*cirq_data), GFP_KERNEL);
> > + if (!cirq_data)
> > + return -ENOMEM;
> > +
> > + cirq_data->base = of_iomap(node, 0);
> > + if (!cirq_data->base) {
> > + pr_err("mtk_cirq: unable to map cirq register\n");
> > + ret = -ENXIO;
> > + goto out_free;
> > + }
> > +
> > + ret = of_property_read_u32_index(node, "mediatek,ext-irq-range", 0,
> > + &cirq_data->ext_irq_start);
> > + if (ret)
> > + goto out_unmap;
> > +
> > + ret = of_property_read_u32_index(node, "mediatek,ext-irq-range", 1,
> > + &cirq_data->ext_irq_end);
> > + if (ret)
> > + goto out_unmap;
> > +
> > + irq_num = cirq_data->ext_irq_end - cirq_data->ext_irq_start + 1;
> > + domain = irq_domain_add_hierarchy(domain_parent, 0,
> > + irq_num, node,
> > + &cirq_domain_ops, cirq_data);
> > + if (!domain) {
> > + ret = -ENOMEM;
> > + goto out_unmap;
> > + }
> > + cirq_data->domain = domain;
> > +
> > + mtk_cirq_syscore_init();
> > +
> > + return 0;
> > +
> > +out_unmap:
> > + iounmap(cirq_data->base);
> > +out_free:
> > + kfree(cirq_data);
> > + return ret;
> > +}
> > +
> > +IRQCHIP_DECLARE(mtk_cirq, "mediatek,mtk-cirq", mtk_cirq_of_init);
> >
>
> It otherwise looks much better than the previous iteration.
>
> Thanks,
>
> M.
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