From: Suman Anna <s-anna@xxxxxx> 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 support to the PRUSS INTC driver to allow both these shared and invalid interrupts by not returning a failure if any of these interrupts are skipped from the corresponding INTC DT node. Signed-off-by: Suman Anna <s-anna@xxxxxx> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@xxxxxxxxxx> --- v2->v3: - Extra checks for (intc->irqs[i]) in error/remove path was moved from "irqchip/irq-pruss-intc: Add a PRUSS irqchip driver for PRUSS interrupts" to this patch v1->v2: - https://patchwork.kernel.org/patch/11069757/ --- drivers/irqchip/irq-pruss-intc.c | 73 +++++++++++++++++++++++++++++++++++++--- 1 file changed, 68 insertions(+), 5 deletions(-) diff --git a/drivers/irqchip/irq-pruss-intc.c b/drivers/irqchip/irq-pruss-intc.c index fb3dda3..49c936f 100644 --- a/drivers/irqchip/irq-pruss-intc.c +++ b/drivers/irqchip/irq-pruss-intc.c @@ -65,11 +65,15 @@ * @irqs: kernel irq numbers corresponding to PRUSS host interrupts * @base: base virtual address of INTC register space * @domain: irq domain for this interrupt controller + * @shared_intr: bit-map denoting if the MPU host interrupt is shared + * @invalid_intr: bit-map denoting if host interrupt is not connected to MPU */ struct pruss_intc { unsigned int irqs[MAX_NUM_HOST_IRQS]; void __iomem *base; struct irq_domain *domain; + u16 shared_intr; + u16 invalid_intr; }; static inline u32 pruss_intc_read_reg(struct pruss_intc *intc, unsigned int reg) @@ -222,7 +226,8 @@ static int pruss_intc_probe(struct platform_device *pdev) "host_intr4", "host_intr5", "host_intr6", "host_intr7", }; struct device *dev = &pdev->dev; struct pruss_intc *intc; - int i, irq; + int i, irq, count; + u8 temp_intr[MAX_NUM_HOST_IRQS] = { 0 }; intc = devm_kzalloc(dev, sizeof(*intc), GFP_KERNEL); if (!intc) @@ -235,6 +240,52 @@ static int pruss_intc_probe(struct platform_device *pdev) return PTR_ERR(intc->base); } + count = of_property_read_variable_u8_array(dev->of_node, + "ti,irqs-reserved", + temp_intr, 0, + MAX_NUM_HOST_IRQS); + /* + * The irqs-reserved is used only for some SoC's therefore not having + * this property is still valid + */ + if (count == -EINVAL) + count = 0; + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + if (temp_intr[i] >= MAX_NUM_HOST_IRQS) { + dev_warn(dev, "ignoring invalid reserved irq %d\n", + temp_intr[i]); + continue; + } + + intc->invalid_intr |= BIT(temp_intr[i]); + } + + count = of_property_read_variable_u8_array(dev->of_node, + "ti,irqs-shared", + temp_intr, 0, + MAX_NUM_HOST_IRQS); + /* + * The irqs-shared is used only for some SoC's therefore not having + * this property is still valid + */ + if (count == -EINVAL) + count = 0; + if (count < 0) + return count; + + for (i = 0; i < count; i++) { + if (temp_intr[i] >= MAX_NUM_HOST_IRQS) { + dev_warn(dev, "ignoring invalid shared irq %d\n", + temp_intr[i]); + continue; + } + + intc->shared_intr |= BIT(temp_intr[i]); + } + pruss_intc_init(intc); /* always 64 events */ @@ -244,8 +295,14 @@ static int pruss_intc_probe(struct platform_device *pdev) return -ENOMEM; for (i = 0; i < MAX_NUM_HOST_IRQS; i++) { + if (intc->invalid_intr & BIT(i)) + continue; + irq = platform_get_irq_byname(pdev, irq_names[i]); if (irq <= 0) { + if (intc->shared_intr & BIT(i)) + continue; + dev_err(dev, "platform_get_irq_byname failed for %s : %d\n", irq_names[i], irq); goto fail_irq; @@ -259,8 +316,11 @@ static int pruss_intc_probe(struct platform_device *pdev) return 0; fail_irq: - while (--i >= 0) - irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL); + while (--i >= 0) { + if (intc->irqs[i]) + irq_set_chained_handler_and_data(intc->irqs[i], NULL, + NULL); + } irq_domain_remove(intc->domain); @@ -273,8 +333,11 @@ static int pruss_intc_remove(struct platform_device *pdev) unsigned int hwirq; int i; - for (i = 0; i < MAX_NUM_HOST_IRQS; i++) - irq_set_chained_handler_and_data(intc->irqs[i], NULL, NULL); + for (i = 0; i < MAX_NUM_HOST_IRQS; i++) { + if (intc->irqs[i]) + irq_set_chained_handler_and_data(intc->irqs[i], NULL, + NULL); + } for (hwirq = 0; hwirq < MAX_PRU_SYS_EVENTS; hwirq++) irq_dispose_mapping(irq_find_mapping(intc->domain, hwirq)); -- 2.7.4
