[PATCH] [RFC] Using hierarchy irqdomian to implement MTK intpol.
Jiang Liu
jiang.liu at linux.intel.com
Wed Sep 24 20:12:55 PDT 2014
On 2014/9/25 0:04, Joe.C wrote:
> From: "Joe.C" <yingjoe.chen at mediatek.com>
>
> Here's the first draft of using hierarchy irqdomain to implement MTK intpol
> support. I have tested it and intpol works fine. Before continue, I'd like
> to get your comments. This is based on Jiang's hierarchy irqdomian [1] and
> my mediatek SoC basic support [2].
>
> Simplified block diagram for interrupt:
>
> --------- ---------
> ---| CIRQ |------|ARM GIC|
> ---| |------| |
> ---| |------| |
> ---| |------| |
> ---| |------| |
> --------- ---------
>
> In device tree, interrupt-parent for other devices is cirq, child of gic.
> This describe HW better and allow device to specify polarity as it is sent
> by the device. I'm using interrupt-parent to specify irq domain parent in
> cirq now. Maybe adding another name like 'interrupt-domain-parent' will be
> better.
>
> Currently only set_type is implement in CIRQ, but I think this could extended
> to cover all function gic_arch_extn provided.
>
> In order to use hierarchy irq domain, gic can't use legacy irq domain anymore.
> If arm,hierarchy-irq-domain property is specified, GIC will work in hierarchy
> way and all interrupt must be set by device tree.
>
> One thing worth mention is arg in irq_domain_alloc_irqs. On x86, msi is using
> struct irq_alloc_info, to pass data between irq domain. In irq_create_of_mapping(),
> of_phandle_args is used. All allocs in irq_domain chain will need to use same
> interrupt-cells formats.
>
>
> [1] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/286542.html
> [2] http://lists.infradead.org/pipermail/linux-arm-kernel/2014-September/284553.html
>
> Signed-off-by: Joe.C <yingjoe.chen at mediatek.com>
> ---
> arch/arm/boot/dts/mt8135.dtsi | 14 +++-
> drivers/irqchip/Makefile | 1 +
> drivers/irqchip/irq-gic.c | 53 +++++++++++--
> drivers/irqchip/irq-mt65xx-cirq.c | 158 ++++++++++++++++++++++++++++++++++++++
> include/linux/irq.h | 5 ++
> kernel/irq/chip.c | 28 +++++++
> kernel/irq/irqdomain.c | 14 ++--
> 7 files changed, 256 insertions(+), 17 deletions(-)
> create mode 100644 drivers/irqchip/irq-mt65xx-cirq.c
>
> diff --git a/arch/arm/boot/dts/mt8135.dtsi b/arch/arm/boot/dts/mt8135.dtsi
> index 90a56ad..e19ab1a 100644
> --- a/arch/arm/boot/dts/mt8135.dtsi
> +++ b/arch/arm/boot/dts/mt8135.dtsi
> @@ -18,7 +18,7 @@
>
> / {
> compatible = "mediatek,mt8135";
> - interrupt-parent = <&gic>;
> + interrupt-parent = <&cirq>;
>
> cpu-map {
> cluster0 {
> @@ -97,15 +97,25 @@
> timer: timer at 10008000 {
> compatible = "mediatek,mt8135-timer", "mediatek,mt6577-timer";
> reg = <0 0x10008000 0 0x80>;
> - interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_HIGH>;
> + interrupts = <GIC_SPI 113 IRQ_TYPE_LEVEL_LOW>;
> clocks = <&system_clk>, <&rtc_clk>;
> clock-names = "system-clk", "rtc-clk";
> };
>
> + cirq: interrupt-controller at 10200030 {
> + compatible = "mediatek,mt8135-cirq", "mediatek,mt6577-cirq";
> + interrupt-controller;
> + #interrupt-cells = <3>;
> + interrupt-parent = <&gic>;
> + reg = <0 0x10200030 0 0x1c>;
> + };
> +
> gic: interrupt-controller at 10211000 {
> compatible = "arm,cortex-a15-gic";
> interrupt-controller;
> #interrupt-cells = <3>;
> + arm,hierarchy-irq-domain;
> + interrupt-parent = <&gic>;
> reg = <0 0x10211000 0 0x1000>,
> <0 0x10212000 0 0x1000>,
> <0 0x10214000 0 0x2000>,
> diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
> index 73052ba..0b34675 100644
> --- a/drivers/irqchip/Makefile
> +++ b/drivers/irqchip/Makefile
> @@ -34,3 +34,4 @@ obj-$(CONFIG_XTENSA) += irq-xtensa-pic.o
> obj-$(CONFIG_XTENSA_MX) += irq-xtensa-mx.o
> obj-$(CONFIG_IRQ_CROSSBAR) += irq-crossbar.o
> obj-$(CONFIG_BRCMSTB_L2_IRQ) += irq-brcmstb-l2.o
> +obj-$(CONFIG_ARCH_MEDIATEK) += irq-mt65xx-cirq.o
> diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c
> index 4b959e6..d66d707 100644
> --- a/drivers/irqchip/irq-gic.c
> +++ b/drivers/irqchip/irq-gic.c
> @@ -767,22 +767,50 @@ void __init gic_init_physaddr(struct device_node *node)
> static int gic_irq_domain_map(struct irq_domain *d, unsigned int irq,
> irq_hw_number_t hw)
> {
> + irq_domain_set_hwirq_and_chip(d, irq, hw, &gic_chip, d->host_data);
Hi Joe,
Seems you missed the change to enable Kconfig option
CONFIG_IRQ_DOMAIN_HIERARCHY. If CONFIG_IRQ_DOMAIN_HIERARCHY
may be off under certain conditions, above code may cause
building failure.
Regards!
Gerry
> if (hw < 32) {
> irq_set_percpu_devid(irq);
> - irq_set_chip_and_handler(irq, &gic_chip,
> - handle_percpu_devid_irq);
> + irq_set_handler(irq, handle_percpu_devid_irq);
> set_irq_flags(irq, IRQF_VALID | IRQF_NOAUTOEN);
> } else {
> - irq_set_chip_and_handler(irq, &gic_chip,
> - handle_fasteoi_irq);
> + irq_set_handler(irq, handle_fasteoi_irq);
> set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
>
> gic_routable_irq_domain_ops->map(d, irq, hw);
> }
> - irq_set_chip_data(irq, d->host_data);
> return 0;
> }
>
> +static int gic_irq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *arg)
> +{
> + int i, ret;
> + irq_hw_number_t hwirq;
> + unsigned int type = IRQ_TYPE_NONE;
> + struct of_phandle_args *irq_data = arg;
> +
> + ret = domain->ops->xlate(domain, irq_data->np, irq_data->args,
> + irq_data->args_count, &hwirq, &type);
> + if (ret)
> + return ret;
> +
> + for (i = 0; i < nr_irqs; i++)
> + gic_irq_domain_map(domain, virq+i, hwirq+i);
> +
> + return 0;
> +}
> +
> +static void gic_irq_domain_free(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs)
> +{
> + int i;
> +
> + for (i = 0; i < nr_irqs; i++) {
> + irq_set_handler(virq + i, NULL);
> + irq_domain_set_hwirq_and_chip(domain, virq + i, 0, NULL, NULL);
> + }
> +}
> +
> static void gic_irq_domain_unmap(struct irq_domain *d, unsigned int irq)
> {
> gic_routable_irq_domain_ops->unmap(d, irq);
> @@ -795,8 +823,6 @@ static int gic_irq_domain_xlate(struct irq_domain *d,
> {
> unsigned long ret = 0;
>
> - if (d->of_node != controller)
> - return -EINVAL;
> if (intsize < 3)
> return -EINVAL;
>
> @@ -839,6 +865,14 @@ static struct notifier_block gic_cpu_notifier = {
> };
> #endif
>
> +static const struct irq_domain_ops gic_irq_domain_hierarchy_ops = {
> + .alloc = gic_irq_domain_alloc,
> + .free = gic_irq_domain_free,
> + .map = gic_irq_domain_map,
> + .unmap = gic_irq_domain_unmap,
> + .xlate = gic_irq_domain_xlate,
> +};
> +
> static const struct irq_domain_ops gic_irq_domain_ops = {
> .map = gic_irq_domain_map,
> .unmap = gic_irq_domain_unmap,
> @@ -952,7 +986,10 @@ void __init gic_init_bases(unsigned int gic_nr, int irq_start,
>
> gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */
>
> - if (of_property_read_u32(node, "arm,routable-irqs",
> + if (of_find_property(node, "arm,hierarchy-irq-domain", NULL))
> + gic->domain = irq_domain_add_linear(node, gic_irqs,
> + &gic_irq_domain_hierarchy_ops, gic);
> + else if (of_property_read_u32(node, "arm,routable-irqs",
> &nr_routable_irqs)) {
> irq_base = irq_alloc_descs(irq_start, 16, gic_irqs,
> numa_node_id());
> diff --git a/drivers/irqchip/irq-mt65xx-cirq.c b/drivers/irqchip/irq-mt65xx-cirq.c
> new file mode 100644
> index 0000000..1243a7f
> --- /dev/null
> +++ b/drivers/irqchip/irq-mt65xx-cirq.c
> @@ -0,0 +1,158 @@
> +
> +#include <linux/irq.h>
> +#include <linux/irqdomain.h>
> +#include <linux/of.h>
> +#include <linux/of_irq.h>
> +#include <linux/of_address.h>
> +#include <linux/io.h>
> +#include <linux/slab.h>
> +#include <linux/spinlock.h>
> +
> +#include "irqchip.h"
> +
> +#define MT6577_SYS_CIRQ_NUM (168)
> +
> +struct mt_cirq_chip_data {
> + spinlock_t lock;
> + void __iomem *intpol_base;
> +};
> +
> +
> +static int mt_cirq_set_type(struct irq_data *data, unsigned int type)
> +{
> + irq_hw_number_t hwirq = data->hwirq;
> + struct mt_cirq_chip_data *chip_data = data->chip_data;
> + u32 offset, reg_index, value;
> + unsigned long flags;
> + int ret;
> +
> + offset = hwirq & 0x1f;
> + reg_index = hwirq >> 5;
> +
> + spin_lock_irqsave(&chip_data->lock, flags);
> + value = readl_relaxed(chip_data->intpol_base + reg_index * 4);
> + if (type == IRQ_TYPE_LEVEL_LOW || type == IRQ_TYPE_EDGE_FALLING) {
> + type = (type == IRQ_TYPE_LEVEL_LOW) ?
> + IRQ_TYPE_LEVEL_HIGH : IRQ_TYPE_EDGE_RISING;
> + value |= (1 << offset);
> + } else
> + value &= ~(1 << offset);
> + writel(value, chip_data->intpol_base + reg_index * 4);
> +
> + data = data->parent_data;
> + ret = data->chip->irq_set_type(data, type);
> + spin_unlock_irqrestore(&chip_data->lock, flags);
> + return ret;
> +}
> +
> +static struct irq_chip mt_cirq_chip = {
> + .name = "MT_CIRQ",
> + .irq_mask = irq_chip_mask_parent,
> + .irq_unmask = irq_chip_unmask_parent,
> + .irq_eoi = irq_chip_eoi_parent,
> + .irq_set_type = mt_cirq_set_type,
> + .irq_retrigger = irq_chip_retrigger_hierarchy,
> + .irq_set_affinity = irq_chip_set_affinity_parent,
> +};
> +
> +static int mt_cirq_domain_alloc(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs, void *arg)
> +{
> + int i, ret;
> + irq_hw_number_t hwirq;
> + struct of_phandle_args *irq_data = arg;
> +
> + if (irq_data->args_count != 3)
> + return -EINVAL;
> +
> + hwirq = irq_data->args[1];
> + if (irq_find_mapping(domain, hwirq) > 0)
> + return -EEXIST;
> +
> + for (i = 0; i < nr_irqs; i++)
> + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i,
> + &mt_cirq_chip, domain->host_data);
> +
> + ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
> + if (ret < 0)
> + return ret;
> +
> + return 0;
> +}
> +
> +static void mt_cirq_domain_free(struct irq_domain *domain, unsigned int virq,
> + unsigned int nr_irqs)
> +{
> + int i;
> +
> + for (i = 0; i < nr_irqs; i++) {
> + irq_set_handler(virq + i, NULL);
> + irq_domain_set_hwirq_and_chip(domain, virq + i, 0, NULL, NULL);
> + }
> + irq_domain_free_irqs_parent(domain, virq, nr_irqs);
> +}
> +
> +static int mt_cirq_domain_xlate(struct irq_domain *d,
> + struct device_node *controller,
> + const u32 *intspec, unsigned int intsize,
> + unsigned long *out_hwirq,
> + unsigned int *out_type)
> +{
> + return d->parent->ops->xlate(d->parent, controller, intspec, intsize,
> + out_hwirq, out_type);
> +}
> +
> +static struct irq_domain_ops cirq_domain_ops = {
> + .alloc = mt_cirq_domain_alloc,
> + .free = mt_cirq_domain_free,
> + .xlate = mt_cirq_domain_xlate,
> +};
I'm trying to make change to irq_create_of_mapping() in next version,
which will affect you patch in two aspects:
1) no need to implement mt_cirq_domain_xlate。
2）OF hierarchy irqdomain callbacks need to implement following logic:
if (type != IRQ_TYPE_NONE &&
type != irq_get_trigger_type(virq))
irq_set_irq_type(virq, type);
Regards!
Gerry
> +
> +static int __init mtk_cirq_of_init(struct device_node *node,
> + struct device_node *parent)
> +{
> + struct device_node *parent_node;
> + struct irq_domain *domain, *domain_parent = NULL;
> + struct mt_cirq_chip_data *chip_data;
> + int ret = 0;
> +
> + parent_node = of_irq_find_parent(node);
> + if (parent_node) {
> + domain_parent = irq_find_host(parent_node);
> + of_node_put(parent_node);
> + }
> +
> + if (!domain_parent) {
> + pr_err("mtk_cirq: interrupt-parent not found\n");
> + return -EINVAL;
> + }
> +
> + chip_data = kzalloc(sizeof(*chip_data), GFP_KERNEL);
> + if (!chip_data)
> + return -ENOMEM;
> +
> + chip_data->intpol_base = of_io_request_and_map(node, 0, "intpol");
> + if (!chip_data->intpol_base) {
> + pr_err("mtk_cirq: unable to map cirq register\n");
> + ret = -ENOMEM;
> + goto out_free;
> + }
> +
> + domain = irq_domain_add_linear(node, MT6577_SYS_CIRQ_NUM,
> + &cirq_domain_ops, chip_data);
> + if (!domain) {
> + ret = -ENOMEM;
> + goto out_unmap;
> + }
> + domain->parent = domain_parent;
> + spin_lock_init(&chip_data->lock);
> +
> + return 0;
> +
> +out_unmap:
> + iounmap(chip_data->intpol_base);
> +out_free:
> + kfree(chip_data);
> + return ret;
> +}
> +IRQCHIP_DECLARE(mtk_cirq, "mediatek,mt6577-cirq", mtk_cirq_of_init);
> diff --git a/include/linux/irq.h b/include/linux/irq.h
> index bfa027f..a877b88 100644
> --- a/include/linux/irq.h
> +++ b/include/linux/irq.h
> @@ -435,6 +435,11 @@ extern void handle_nested_irq(unsigned int irq);
>
> #ifdef CONFIG_IRQ_DOMAIN_HIERARCHY
> extern void irq_chip_ack_parent(struct irq_data *data);
> +extern void irq_chip_mask_parent(struct irq_data *data);
> +extern void irq_chip_unmask_parent(struct irq_data *data);
> +extern void irq_chip_eoi_parent(struct irq_data *data);
> +extern int irq_chip_set_affinity_parent(struct irq_data *data,
> + const struct cpumask *dest, bool force);
> extern int irq_chip_retrigger_hierarchy(struct irq_data *data);
> #endif
>
> diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
> index b8ee27e..da3042b 100644
> --- a/kernel/irq/chip.c
> +++ b/kernel/irq/chip.c
> @@ -830,6 +830,34 @@ void irq_chip_ack_parent(struct irq_data *data)
> data->chip->irq_ack(data);
> }
>
> +void irq_chip_mask_parent(struct irq_data *data)
> +{
> + data = data->parent_data;
> + data->chip->irq_mask(data);
> +}
> +
> +void irq_chip_unmask_parent(struct irq_data *data)
> +{
> + data = data->parent_data;
> + data->chip->irq_unmask(data);
> +}
> +
> +void irq_chip_eoi_parent(struct irq_data *data)
> +{
> + data = data->parent_data;
> + data->chip->irq_eoi(data);
> +}
> +
> +int irq_chip_set_affinity_parent(struct irq_data *data,
> + const struct cpumask *dest, bool force)
> +{
> + data = data->parent_data;
> + if (data->chip->irq_set_affinity)
> + return data->chip->irq_set_affinity(data, dest, force);
> +
> + return -ENOSYS;
> +}
> +
> int irq_chip_retrigger_hierarchy(struct irq_data *data)
> {
> for (data = data->parent_data; data; data = data->parent_data)
> diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
> index e285f3a..01e852b 100644
> --- a/kernel/irq/irqdomain.c
> +++ b/kernel/irq/irqdomain.c
> @@ -467,7 +467,7 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
> struct irq_domain *domain;
> irq_hw_number_t hwirq;
> unsigned int type = IRQ_TYPE_NONE;
> - unsigned int virq;
> + int virq;
>
> domain = irq_data->np ? irq_find_host(irq_data->np) : irq_default_domain;
> if (!domain) {
> @@ -493,8 +493,8 @@ unsigned int irq_create_of_mapping(struct of_phandle_args *irq_data)
> else
> #endif
> virq = irq_create_mapping(domain, hwirq);
> - if (!virq)
> - return virq;
> + if (virq <= 0)
> + return 0;
>
> /* Set type if specified and different than the current one */
> if (type != IRQ_TYPE_NONE &&
> @@ -716,20 +716,20 @@ const struct irq_domain_ops irq_domain_simple_ops = {
> };
> EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
>
> -static int irq_domain_alloc_descs(int virq, unsigned int nr_irqs,
> +static int irq_domain_alloc_descs(int virq, unsigned int cnt,
> irq_hw_number_t hwirq, int node)
> {
> unsigned int hint;
>
> if (virq >= 0) {
> - virq = irq_alloc_descs(virq, virq, nr_irqs, node);
> + virq = irq_alloc_descs(virq, virq, cnt, node);
> } else {
> hint = hwirq % nr_irqs;
> if (hint == 0)
> hint++;
> - virq = irq_alloc_descs_from(hint, nr_irqs, node);
> + virq = irq_alloc_descs_from(hint, cnt, node);
> if (virq <= 0 && hint > 1)
> - virq = irq_alloc_descs_from(1, nr_irqs, node);
> + virq = irq_alloc_descs_from(1, cnt, node);
> }
>
> return virq;
>
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