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openwrt/target/linux/cns3xxx/patches-3.18/110-pci_isolated_interrupts...

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5.8 KiB
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--- 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>
@@ -872,6 +873,47 @@ 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_irq(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;
+
+ /* 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]);
+ cns3xxx_pcie_set_irqs(0, irqs);
+ } else {
+ printk("laguna: using shared PCI interrupts: irq%d\n",
+ IRQ_CNS3XXX_PCIE0_DEVICE);
+ }
+
+ return 0;
+}
+subsys_initcall(laguna_pcie_init_irq);
+
static int __init laguna_model_setup(void)
{
u32 __iomem *mem;
@@ -883,8 +925,33 @@ 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"
@@ -27,7 +28,7 @@ struct cns3xxx_pcie {
void __iomem *host_regs; /* PCI config registers for host bridge */
void __iomem *cfg0_regs; /* PCI Type 0 config registers */
void __iomem *cfg1_regs; /* PCI Type 1 config registers */
- unsigned int irqs[2];
+ unsigned int irqs[5];
struct resource res_io;
struct resource res_mem;
struct hw_pci hw_pci;
@@ -97,7 +98,7 @@ static inline int check_master_abort(str
void __iomem *host_base;
u32 sreg, ereg;
- host_base = (void __iomem *) cnspci->cfg_bases[CNS3XXX_HOST_TYPE].virtual;
+ host_base = (void __iomem *) cnspci->host_regs;
sreg = __raw_readw(host_base + 0x6) & 0xF900;
ereg = __raw_readl(host_base + 0x104); // Uncorrectable Error Status Reg
@@ -251,7 +252,7 @@ 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[!!dev->bus->number];
+ int irq = cnspci->irqs[!!dev->bus->number + 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),
@@ -277,7 +278,12 @@ static struct cns3xxx_pcie cns3xxx_pcie[
.end = CNS3XXX_PCIE0_HOST_BASE - 1, /* 176 MiB */
.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,
@@ -302,7 +308,13 @@ static struct cns3xxx_pcie cns3xxx_pcie[
.end = CNS3XXX_PCIE1_HOST_BASE - 1, /* 176 MiB */
.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,
@@ -412,6 +424,14 @@ static int cns3xxx_pcie_abort_handler(un
return 0;
}
+void __init cns3xxx_pcie_set_irqs(int bus, int *irqs)
+{
+ int i;
+
+ for (i = 0; i < 4; i++)
+ cns3xxx_pcie[bus].irqs[i + 1] = irqs[i];
+}
+
void __init cns3xxx_pcie_init_late(void)
{
int i;
--- a/arch/arm/mach-cns3xxx/core.h
+++ b/arch/arm/mach-cns3xxx/core.h
@@ -18,8 +18,10 @@ extern void cns3xxx_timer_init(void);
#ifdef CONFIG_PCI
extern void __init cns3xxx_pcie_init_late(void);
+extern void __init cns3xxx_pcie_set_irqs(int bus, int *irqs);
#else
static inline void __init cns3xxx_pcie_init_late(void) {}
+static inline void cns3xxx_pcie_set_irqs(int bus, int *irqs) {}
#endif
void __init cns3xxx_map_io(void);
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