diff options
| -rw-r--r-- | arch/arm/mach-versatile/versatile_dt.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/arch/arm/mach-versatile/versatile_dt.c b/arch/arm/mach-versatile/versatile_dt.c index 7de3e92a13b0..a58575832fa3 100644 --- a/arch/arm/mach-versatile/versatile_dt.c +++ b/arch/arm/mach-versatile/versatile_dt.c @@ -22,15 +22,65 @@ */ #include <linux/init.h> +#include <linux/io.h> +#include <linux/of.h> +#include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> +#include <linux/slab.h> #include <asm/mach-types.h> #include <asm/mach/arch.h> #include "core.h" +#define VERSATILE_SYS_PCICTL_OFFSET 0x44 +static void __iomem *versatile_sys_base; + +static void __init versatile_dt_pci_init(void) +{ + u32 val; + struct device_node *np; + struct property *newprop; + + np = of_find_compatible_node(NULL, NULL, "arm,versatile-pci"); + if (!np) + return; + + /* Check if PCI backplane is detected */ + val = readl(versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); + if (val & 1) { + /* + * Enable PCI accesses. Note that the documentaton is + * inconsistent whether or not this is needed, but the old + * driver had it so we will keep it. + */ + writel(1, versatile_sys_base + VERSATILE_SYS_PCICTL_OFFSET); + return; + } + + newprop = kzalloc(sizeof(*newprop), GFP_KERNEL); + if (!newprop) + return; + + newprop->name = kstrdup("status", GFP_KERNEL); + newprop->value = kstrdup("disabled", GFP_KERNEL); + newprop->length = sizeof("disabled"); + of_update_property(np, newprop); + + pr_info("Not plugged into PCI backplane!\n"); +} + static void __init versatile_dt_init(void) { + struct device_node *np; + + np = of_find_compatible_node(NULL, NULL, "arm,core-module-versatile"); + if (np) + versatile_sys_base = of_iomap(np, 0); + WARN_ON(!versatile_sys_base); + + versatile_dt_pci_init(); + of_platform_populate(NULL, of_default_bus_match_table, versatile_auxdata_lookup, NULL); } |