openwrtv3/target/linux/cns3xxx/patches-3.14/310-pci_isolated_interrupts.patch

--- a/arch/arm/mach-cns3xxx/cns3420vb.c
+++ b/arch/arm/mach-cns3xxx/cns3420vb.c
@@ -274,7 +274,7 @@ static int __init cns3420vb_pcie_init(vo
 	if (!machine_is_cns3420vb())
 		return 0;
 
-	return cns3xxx_pcie_init();
+	return cns3xxx_pcie_init(NULL, NULL);
 }
 subsys_initcall(cns3420vb_pcie_init);
 
--- a/arch/arm/mach-cns3xxx/core.h
+++ b/arch/arm/mach-cns3xxx/core.h
@@ -19,7 +19,7 @@ extern void cns3xxx_pcie_iotable_init(vo
 
 void __init cns3xxx_map_io(void);
 void __init cns3xxx_init_irq(void);
-int  __init cns3xxx_pcie_init(void);
+int  __init cns3xxx_pcie_init(int *pcie0_irqs, int *pcie1_irqs);
 void cns3xxx_power_off(void);
 void cns3xxx_restart(enum reboot_mode, const char *);
 
--- a/arch/arm/mach-cns3xxx/laguna.c
+++ b/arch/arm/mach-cns3xxx/laguna.c
@@ -21,6 +21,7 @@
 #include <linux/kernel.h>
 #include <linux/compiler.h>
 #include <linux/io.h>
+#include <linux/irq.h>
 #include <linux/gpio.h>
 #include <linux/dma-mapping.h>
 #include <linux/serial_core.h>
@@ -868,12 +869,42 @@ static int laguna_register_gpio(struct g
 	return ret;
 }
 
+/* allow disabling of external isolated PCIe IRQs */
+static int cns3xxx_pciextirq = 1;
+static int __init cns3xxx_pciextirq_disable(char *s)
+{
+        cns3xxx_pciextirq = 0;
+        return 1;
+}
+__setup("noextirq", cns3xxx_pciextirq_disable);
+
 static int __init laguna_pcie_init(void)
 {
+	u32 __iomem *mem = (void __iomem *)(CNS3XXX_GPIOB_BASE_VIRT + 0x0004);
+	u32 reg = (__raw_readl(mem) >> 26) & 0xf;
+	int irqs[] = {
+		IRQ_CNS3XXX_EXTERNAL_PIN0,
+		IRQ_CNS3XXX_EXTERNAL_PIN1,
+		IRQ_CNS3XXX_EXTERNAL_PIN2,
+		154,
+	};
+
 	if (!machine_is_gw2388())
 		return 0;
 
-	return cns3xxx_pcie_init();
+	/* Verify GPIOB[26:29] == 0001b indicating support for ext irqs */
+	if (cns3xxx_pciextirq && reg != 1)
+		cns3xxx_pciextirq = 0;
+
+	if (cns3xxx_pciextirq) {
+		printk("laguna: using isolated PCI interrupts:"
+		       " irq%d/irq%d/irq%d/irq%d\n",
+		       irqs[0], irqs[1], irqs[2], irqs[3]);
+		return cns3xxx_pcie_init(irqs, NULL);
+	}
+	printk("laguna: using shared PCI interrupts: irq%d\n",
+	       IRQ_CNS3XXX_PCIE0_DEVICE);
+	return cns3xxx_pcie_init(NULL, NULL);
 }
 subsys_initcall(laguna_pcie_init);
 
@@ -888,8 +919,33 @@ static int __init laguna_model_setup(voi
 	printk("Running on Gateworks Laguna %s\n", laguna_info.model);
 	cns3xxx_gpio_init( 0, 32, CNS3XXX_GPIOA_BASE_VIRT, IRQ_CNS3XXX_GPIOA,
 		NR_IRQS_CNS3XXX);
-	cns3xxx_gpio_init(32, 32, CNS3XXX_GPIOB_BASE_VIRT, IRQ_CNS3XXX_GPIOB,
-		NR_IRQS_CNS3XXX + 32);
+
+	/*
+	 * If pcie external interrupts are supported and desired
+	 * configure IRQ types and configure pin function.
+	 * Note that cns3xxx_pciextirq is enabled by default, but can be
+	 * unset via the 'noextirq' kernel param or by laguna_pcie_init() if
+	 * the baseboard model does not support this hardware feature.
+	 */
+	if (cns3xxx_pciextirq) {
+		mem = (void __iomem *)(CNS3XXX_MISC_BASE_VIRT + 0x0018);
+		reg = __raw_readl(mem);
+		/* GPIO26 is gpio, EXT_INT[0:2] not gpio func */
+		reg &= ~0x3c000000;
+		reg |= 0x38000000;
+		__raw_writel(reg, mem);
+
+		cns3xxx_gpio_init(32, 32, CNS3XXX_GPIOB_BASE_VIRT,
+				  IRQ_CNS3XXX_GPIOB, NR_IRQS_CNS3XXX + 32);
+
+		irq_set_irq_type(154, IRQ_TYPE_LEVEL_LOW);
+		irq_set_irq_type(93, IRQ_TYPE_LEVEL_HIGH);
+		irq_set_irq_type(94, IRQ_TYPE_LEVEL_HIGH);
+		irq_set_irq_type(95, IRQ_TYPE_LEVEL_HIGH);
+	} else {
+		cns3xxx_gpio_init(32, 32, CNS3XXX_GPIOB_BASE_VIRT,
+				  IRQ_CNS3XXX_GPIOB, NR_IRQS_CNS3XXX + 32);
+	}
 
 	if (strncmp(laguna_info.model, "GW", 2) == 0) {
 		if (laguna_info.config_bitmap & ETH0_LOAD)
--- a/arch/arm/mach-cns3xxx/pcie.c
+++ b/arch/arm/mach-cns3xxx/pcie.c
@@ -18,6 +18,7 @@
 #include <linux/io.h>
 #include <linux/ioport.h>
 #include <linux/interrupt.h>
+#include <linux/irq.h>
 #include <linux/ptrace.h>
 #include <asm/mach/map.h>
 #include "cns3xxx.h"
@@ -32,7 +33,7 @@ enum cns3xxx_access_type {
 
 struct cns3xxx_pcie {
 	struct map_desc cfg_bases[CNS3XXX_NUM_ACCESS_TYPES];
-	unsigned int irqs[2];
+	unsigned int irqs[6];
 	struct resource res_io;
 	struct resource res_mem;
 	struct hw_pci hw_pci;
@@ -255,7 +256,7 @@ static struct pci_ops cns3xxx_pcie_ops =
 static int cns3xxx_pcie_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
 {
 	struct cns3xxx_pcie *cnspci = pdev_to_cnspci(dev);
-	int irq = cnspci->irqs[slot];
+	int irq = cnspci->irqs[slot+pin-1];
 
 	pr_info("PCIe map irq: %04d:%02x:%02x.%02x slot %d, pin %d, irq: %d\n",
 		pci_domain_nr(dev->bus), dev->bus->number, PCI_SLOT(dev->devfn),
@@ -298,7 +299,12 @@ static struct cns3xxx_pcie cns3xxx_pcie[
 			.end = CNS3XXX_PCIE0_MEM_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_MEM,
 		},
-		.irqs = { IRQ_CNS3XXX_PCIE0_RC, IRQ_CNS3XXX_PCIE0_DEVICE, },
+		.irqs = { IRQ_CNS3XXX_PCIE0_RC,
+			  IRQ_CNS3XXX_PCIE0_DEVICE,
+			  IRQ_CNS3XXX_PCIE0_DEVICE,
+			  IRQ_CNS3XXX_PCIE0_DEVICE,
+			  IRQ_CNS3XXX_PCIE0_DEVICE,
+			},
 		.hw_pci = {
 			.domain = 0,
 			.nr_controllers = 1,
@@ -340,7 +346,13 @@ static struct cns3xxx_pcie cns3xxx_pcie[
 			.end = CNS3XXX_PCIE1_MEM_BASE + SZ_16M - 1,
 			.flags = IORESOURCE_MEM,
 		},
-		.irqs = { IRQ_CNS3XXX_PCIE1_RC, IRQ_CNS3XXX_PCIE1_DEVICE, },
+		.irqs = {
+			IRQ_CNS3XXX_PCIE1_RC,
+			IRQ_CNS3XXX_PCIE1_DEVICE,
+			IRQ_CNS3XXX_PCIE1_DEVICE,
+			IRQ_CNS3XXX_PCIE1_DEVICE,
+			IRQ_CNS3XXX_PCIE1_DEVICE,
+		},
 		.hw_pci = {
 			.domain = 1,
 			.nr_controllers = 1,
@@ -460,13 +472,22 @@ void __init cns3xxx_pcie_iotable_init()
 	}
 }
 
-int __init cns3xxx_pcie_init(void)
+int __init cns3xxx_pcie_init(int *pcie0_irqs, int *pcie1_irqs)
 {
 	int i;
 
 	pcibios_min_io = 0;
 	pcibios_min_mem = 0;
 
+	if (pcie0_irqs) {
+		for (i = 0; i < 4; i++)
+			cns3xxx_pcie[0].irqs[i+1] = pcie0_irqs[i];
+	}
+	if (pcie1_irqs) {
+		for (i = 0; i < 4; i++)
+			cns3xxx_pcie[1].irqs[i+1] = pcie1_irqs[i];
+	}
+
 	hook_fault_code(16 + 6, cns3xxx_pcie_abort_handler, SIGBUS, 0,
 			"imprecise external abort");