[PATCH v2 5/6] irqchip/irq-pruss-intc: Implement irq_{get,set}_irqchip_state ops

[Suman Anna]

From: David Lechner <da...@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 enabling a PRU system event.

Example:
     irq_set_irqchip_state(irq, IRQCHIP_STATE_PENDING, true);

Signed-off-by: David Lechner <da...@lechnology.com>
Signed-off-by: Suman Anna <s-a...@ti.com>
---
v2: New patch from David replacing an exported API from v1,
    https://patchwork.kernel.org/patch/11034565/

 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 63cfc665be1e..59e26dfbb179 100644
--- a/drivers/irqchip/irq-pruss-intc.c
+++ b/drivers/irqchip/irq-pruss-intc.c
@@ -7,6 +7,7 @@
  *     Suman Anna <s-a...@ti.com>
  */
 
+#include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/irqchip/chained_irq.h>
 #include <linux/irqchip/irq-pruss-intc.h>
@@ -40,8 +41,7 @@
 #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
@@ -439,6 +439,41 @@ 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_map(struct irq_domain *d, unsigned int virq,
                                     irq_hw_number_t hw)
 {
@@ -583,6 +618,8 @@ static int pruss_intc_probe(struct platform_device *pdev)
        irqchip->irq_unmask = pruss_intc_irq_unmask;
        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->name = dev_name(dev);
        intc->irqchip = irqchip;
 
-- 
2.22.0