[PATCH v6 4/5] irqchip/irq-pruss-intc: Implement irq_{get,set}_irqchip_state ops

Grzegorz Jaszczyk
2020-09-16T00:57:35Z

From: David Lechner <david@lechnology.com>

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 injecting a PRU system event.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
Reviewed-by: Lee Jones <lee.jones@linaro.org>
---
v5->v6:
- Drop example from the commit log
v4->v5:
- No change.
v3->v4:
- Update commit message
v2->v3:
- Get rid of unnecessary pruss_intc_check_write() and use
pruss_intc_write_reg directly.
v1->v2:
- https://patchwork.kernel.org/patch/11069769/
---
drivers/irqchip/irq-pruss-intc.c | 40 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 40 insertions(+)

diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c
index 396dc55..41c6271 100644
--- a/drivers/irqchip/irq-pruss-intc.c
+++ b/drivers/irqchip/irq-pruss-intc.c
@@ -12,6 +12,7 @@
* Copyright (C) 2019 David Lechner <david@lechnology.com>
*/

+#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/irqdomain.h>
@@ -323,6 +324,43 @@ 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)
+ pruss_intc_write_reg(intc, PRU_INTC_SISR, data->hwirq);
+ else
+ pruss_intc_write_reg(intc, PRU_INTC_SICR, data->hwirq);
+
+ return 0;
+}
+
static struct irq_chip pruss_irqchip = {
.name = "pruss-intc",
.irq_ack = pruss_intc_irq_ack,
@@ -330,6 +368,8 @@ static struct irq_chip pruss_irqchip = {
.irq_unmask = pruss_intc_irq_unmask,
.irq_request_resources = pruss_intc_irq_reqres,
.irq_release_resources = pruss_intc_irq_relres,
+ .irq_get_irqchip_state = pruss_intc_irq_get_irqchip_state,
+ .irq_set_irqchip_state = pruss_intc_irq_set_irqchip_state,
};

static int pruss_intc_validate_mapping(struct pruss_intc *intc, int event,
--
2.7.4