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SubjectRe: [PATCH 5/6] irqchip/irq-pruss-intc: Add API to trigger a PRU sysevent
From
Date
On 7/7/19 10:52 PM, Suman Anna wrote:
> From: "Andrew F. Davis" <afd@ti.com>
>
> The PRUSS INTC can generate an interrupt to various processor
> subsystems on the SoC through a set of 64 possible PRU system
> events. These system events can be used by PRU client drivers
> or applications for event notifications/signalling between PRUs
> and MPU or other processors. A new API, pruss_intc_trigger() is
> provided to MPU-side PRU client drivers/applications to be able
> to trigger an event/interrupt using IRQ numbers provided by the
> PRUSS-INTC irqdomain chip.
>
> Signed-off-by: Andrew F. Davis <afd@ti.com>
> Signed-off-by: Suman Anna <s-anna@ti.com>
> Signed-off-by: Roger Quadros <rogerq@ti.com>
> ---
> drivers/irqchip/irq-pruss-intc.c | 31 +++++++++++++++++++++++++++++++
> include/linux/pruss_intc.h | 26 ++++++++++++++++++++++++++
> 2 files changed, 57 insertions(+)
> create mode 100644 include/linux/pruss_intc.h
>
> diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c
> index 8118c2a2ac43..a0ad50b95cd5 100644
> --- a/drivers/irqchip/irq-pruss-intc.c
> +++ b/drivers/irqchip/irq-pruss-intc.c
> @@ -421,6 +421,37 @@ static void pruss_intc_irq_relres(struct irq_data *data)
> module_put(THIS_MODULE);
> }
>
> +/**
> + * pruss_intc_trigger() - trigger a PRU system event
> + * @irq: linux IRQ number associated with a PRU system event
> + *
> + * Trigger an interrupt by signaling a specific PRU system event.
> + * This can be used by PRUSS client users to raise/send an event to
> + * a PRU or any other core that is listening on the host interrupt
> + * mapped to that specific PRU system event. The @irq variable is the
> + * Linux IRQ number associated with a specific PRU system event that
> + * a client user/application uses. The interrupt mappings for this is
> + * provided by the PRUSS INTC irqchip instance.
> + *
> + * Returns 0 on success, or an error value upon failure.
> + */
> +int pruss_intc_trigger(unsigned int irq)
> +{
> + struct irq_desc *desc;
> +
> + if (irq <= 0)
> + return -EINVAL;
> +
> + desc = irq_to_desc(irq);
> + if (!desc)
> + return -EINVAL;
> +
> + pruss_intc_irq_retrigger(&desc->irq_data);
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(pruss_intc_trigger);

Although it is not quite as obvious, we can do the same thing with:

irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, true);

So I don't think a new API is needed. We just need to implement the
irq_set_irqchip_state callback as in the following patch.

---
From c5991a11a19858d74e2a184b76c3ef5823f09ef6 Mon Sep 17 00:00:00 2001
From: David Lechner <david@lechnology.com>
Date: Thu, 11 Jul 2019 15:33:29 -0500
Subject: [PATCH] irqchip/irq-pruss-intc: implement irq_{get,set}_irqchip_state

This implements the irq_get_irqchip_state and irq_set_irqchip_state
callbacks for the TI PRUSS INTC driver. The set callback can be used
by drivers to "kick" a PRU by enabling a PRU system event.

Example:

irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, true);

Signed-off-by: David Lechner <david@lechnology.com>
---
drivers/irqchip/irq-pruss-intc.c | 41 ++++++++++++++++++++++++++++++--
1 file changed, 39 insertions(+), 2 deletions(-)

diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c
index dd14addfd0b4..129dfd52248b 100644
--- a/drivers/irqchip/irq-pruss-intc.c
+++ b/drivers/irqchip/irq-pruss-intc.c
@@ -7,6 +7,7 @@
* Suman Anna <s-anna@ti.com>
*/

+#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
@@ -46,8 +47,7 @@
#define PRU_INTC_HIEISR 0x0034
#define PRU_INTC_HIDISR 0x0038
#define PRU_INTC_GPIR 0x0080
-#define PRU_INTC_SRSR0 0x0200
-#define PRU_INTC_SRSR1 0x0204
+#define PRU_INTC_SRSR(x) (0x0200 + (x) * 4)
#define PRU_INTC_SECR0 0x0280
#define PRU_INTC_SECR1 0x0284
#define PRU_INTC_ESR0 0x0300
@@ -386,6 +386,41 @@ static void pruss_intc_irq_relres(struct irq_data *data)
module_put(THIS_MODULE);
}

+static int pruss_intc_irq_get_irqchip_state(struct irq_data *data,
+ enum irqchip_irq_state which,
+ bool *state)
+{
+ struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+ u32 reg, mask, srsr;
+
+ if (which != IRQCHIP_STATE_PENDING)
+ return -EINVAL;
+
+ reg = PRU_INTC_SRSR(data->hwirq / 32);
+ mask = BIT(data->hwirq % 32);
+
+ srsr = pruss_intc_read_reg(intc, reg);
+
+ *state = !!(srsr & mask);
+
+ return 0;
+}
+
+static int pruss_intc_irq_set_irqchip_state(struct irq_data *data,
+ enum irqchip_irq_state which,
+ bool state)
+{
+ struct pruss_intc *intc = irq_data_get_irq_chip_data(data);
+
+ if (which != IRQCHIP_STATE_PENDING)
+ return -EINVAL;
+
+ if (state)
+ return pruss_intc_check_write(intc, PRU_INTC_SISR, data->hwirq);
+
+ return pruss_intc_check_write(intc, PRU_INTC_SICR, data->hwirq);
+}
+
static int
pruss_intc_irq_domain_xlate(struct irq_domain *d, struct device_node *node,
const u32 *intspec, unsigned int intsize,
@@ -583,6 +618,8 @@ static int pruss_intc_probe(struct platform_device *pdev)
irqchip->irq_retrigger = pruss_intc_irq_retrigger;
irqchip->irq_request_resources = pruss_intc_irq_reqres;
irqchip->irq_release_resources = pruss_intc_irq_relres;
+ irqchip->irq_get_irqchip_state = pruss_intc_irq_get_irqchip_state;
+ irqchip->irq_set_irqchip_state = pruss_intc_irq_set_irqchip_state;
irqchip->parent_device = dev;
irqchip->name = dev_name(dev);
intc->irqchip = irqchip;
--
2.17.1
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