diff options
| author | Tiezhu Yang <yangtiezhu@loongson.cn> | 2020-04-03 17:29:49 +0800 |
|---|---|---|
| committer | Thomas Bogendoerfer <tsbogend@alpha.franken.de> | 2020-04-28 13:26:09 +0200 |
| commit | 8c88cc53ffa62b4bb05931c878bcf3dd10db66b5 (patch) | |
| tree | 71d35c56e18ae3cfb15cdf5b7f9e611d411e180b /arch/mips/loongson64/env.c | |
| parent | 618c35556e5f2156c8bc5cd43664363838e38e45 (diff) | |
MIPS: Loongson: Get host bridge information
Read the address of host bridge configuration space to get the vendor ID
and device ID of host bridge, and then we can distinguish various types
of host bridge such as LS7A or RS780E.
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Reviewed-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips/loongson64/env.c')
| -rw-r--r-- | arch/mips/loongson64/env.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c index 2554ef11170d..71f4aaf58791 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 +183,17 @@ 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; + } else { + pr_info("The bridge chip is RS780E or SR5690\n"); + loongson_sysconf.bridgetype = RS780E; + } } |