irqchip/irq-pruss-intc: Add logic for handling reserved interrupts
The PRUSS INTC has a fixed number of output interrupt lines that are connected to a number of processors or other PRUSS instances or other devices (like DMA) on the SoC. The output interrupt lines 2 through 9 are usually connected to the main Arm host processor and are referred to as host interrupts 0 through 7 from ARM/MPU perspective. All of these 8 host interrupts are not always exclusively connected to the Arm interrupt controller. Some SoCs have some interrupt lines not connected to the Arm interrupt controller at all, while a few others have the interrupt lines connected to multiple processors in which they need to be partitioned as per SoC integration needs. For example, AM437x and 66AK2G SoCs have 2 PRUSS instances each and have the host interrupt 5 connected to the other PRUSS, while AM335x has host interrupt 0 shared between MPU and TSC_ADC and host interrupts 6 & 7 shared between MPU and a DMA controller. Add logic to the PRUSS INTC driver to ignore both these shared and invalid interrupts. Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> Signed-off-by: Marc Zyngier <maz@kernel.org>
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@ -484,7 +484,7 @@ static int pruss_intc_probe(struct platform_device *pdev)
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struct pruss_intc *intc;
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struct pruss_host_irq_data *host_data;
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int i, irq, ret;
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u8 max_system_events;
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u8 max_system_events, irqs_reserved = 0;
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data = of_device_get_match_data(dev);
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if (!data)
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@ -504,6 +504,16 @@ static int pruss_intc_probe(struct platform_device *pdev)
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if (IS_ERR(intc->base))
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return PTR_ERR(intc->base);
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ret = of_property_read_u8(dev->of_node, "ti,irqs-reserved",
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&irqs_reserved);
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/*
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* The irqs-reserved is used only for some SoC's therefore not having
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* this property is still valid
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*/
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if (ret < 0 && ret != -EINVAL)
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return ret;
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pruss_intc_init(intc);
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mutex_init(&intc->lock);
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@ -514,6 +524,9 @@ static int pruss_intc_probe(struct platform_device *pdev)
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return -ENOMEM;
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for (i = 0; i < MAX_NUM_HOST_IRQS; i++) {
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if (irqs_reserved & BIT(i))
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continue;
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irq = platform_get_irq_byname(pdev, irq_names[i]);
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if (irq <= 0) {
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ret = (irq == 0) ? -EINVAL : irq;
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@ -538,8 +551,11 @@ static int pruss_intc_probe(struct platform_device *pdev)
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return 0;
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fail_irq:
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while (--i >= 0)
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irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL);
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while (--i >= 0) {
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if (intc->irqs[i])
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irq_set_chained_handler_and_data(intc->irqs[i], NULL,
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NULL);
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}
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irq_domain_remove(intc->domain);
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@ -553,8 +569,11 @@ static int pruss_intc_remove(struct platform_device *pdev)
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unsigned int hwirq;
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int i;
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for (i = 0; i < MAX_NUM_HOST_IRQS; i++)
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irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL);
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for (i = 0; i < MAX_NUM_HOST_IRQS; i++) {
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if (intc->irqs[i])
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irq_set_chained_handler_and_data(intc->irqs[i], NULL,
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NULL);
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}
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for (hwirq = 0; hwirq < max_system_events; hwirq++)
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irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq));
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