diff options
Diffstat (limited to 'arch/mips/loongson64/env.c')
| -rw-r--r-- | arch/mips/loongson64/env.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c index 2554ef11170d..d11bc346bbca 100644 --- a/arch/mips/loongson64/env.c +++ b/arch/mips/loongson64/env.c @@ -14,12 +14,15 @@ * Author: Wu Zhangjin, wuzhangjin@gmail.com */ #include <linux/export.h> +#include <linux/pci_ids.h> #include <asm/bootinfo.h> #include <loongson.h> #include <boot_param.h> #include <builtin_dtbs.h> #include <workarounds.h> +#define HOST_BRIDGE_CONFIG_ADDR ((void __iomem *)TO_UNCAC(0x1a000000)) + u32 cpu_clock_freq; EXPORT_SYMBOL(cpu_clock_freq); struct efi_memory_map_loongson *loongson_memmap; @@ -43,6 +46,8 @@ void __init prom_init_env(void) struct system_loongson *esys; struct efi_cpuinfo_loongson *ecpu; struct irq_source_routing_table *eirq_source; + u32 id; + u16 vendor, device; /* firmware arguments are initialized in head.S */ boot_p = (struct boot_params *)fw_arg2; @@ -178,4 +183,19 @@ void __init prom_init_env(void) memcpy(loongson_sysconf.sensors, esys->sensors, sizeof(struct sensor_device) * loongson_sysconf.nr_sensors); pr_info("CpuClock = %u\n", cpu_clock_freq); + + /* Read the ID of PCI host bridge to detect bridge type */ + id = readl(HOST_BRIDGE_CONFIG_ADDR); + vendor = id & 0xffff; + device = (id >> 16) & 0xffff; + + if (vendor == PCI_VENDOR_ID_LOONGSON && device == 0x7a00) { + pr_info("The bridge chip is LS7A\n"); + loongson_sysconf.bridgetype = LS7A; + loongson_sysconf.early_config = ls7a_early_config; + } else { + pr_info("The bridge chip is RS780E or SR5690\n"); + loongson_sysconf.bridgetype = RS780E; + loongson_sysconf.early_config = rs780e_early_config; + } } |