diff options
Diffstat (limited to 'target/linux/cns3xxx/files/arch')
| -rw-r--r-- | target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c | 70 |
1 files changed, 64 insertions, 6 deletions
diff --git a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c b/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c index fb519d293f..664492a7e1 100644 --- a/target/linux/cns3xxx/files/arch/arm/mach-cns3xxx/laguna.c +++ b/target/linux/cns3xxx/files/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> @@ -864,7 +865,6 @@ static struct map_desc laguna_io_desc[] __initdata = { static void __init laguna_map_io(void) { cns3xxx_map_io(); - cns3xxx_pcie_iotable_init(); iotable_init(ARRAY_AND_SIZE(laguna_io_desc)); laguna_early_serial_setup(); } @@ -888,14 +888,46 @@ static int laguna_register_gpio(struct gpio *array, size_t num) return ret; } -static int __init laguna_pcie_init(void) +/* 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; - 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]); + 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); +subsys_initcall(laguna_pcie_init_irq); static int __init laguna_model_setup(void) { @@ -908,8 +940,33 @@ static int __init laguna_model_setup(void) 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) @@ -1099,5 +1156,6 @@ MACHINE_START(GW2388, "Gateworks Corporation Laguna Platform") .init_irq = cns3xxx_init_irq, .init_time = cns3xxx_timer_init, .init_machine = laguna_init, + .init_late = cns3xxx_pcie_init_late, .restart = cns3xxx_restart, MACHINE_END |