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>

diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
index 2ed483e32d8c69bf6af63938298718d72676b868..fc9f14bc57770b098b4f0c83d23b4c5f38423211 100644 (file)
--- a/arch/mips/include/asm/mach-loongson64/boot_param.h
+++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
@@ -192,6 +192,11 @@ struct boot_params {
        struct efi_reset_system_t reset_system;
 };
 
+enum loongson_bridge_type {
+       RS780E = 1,
+       LS7A = 2
+};
+
 struct loongson_system_configuration {
        u32 nr_cpus;
        u32 nr_nodes;
@@ -200,6 +205,7 @@ struct loongson_system_configuration {
        u16 boot_cpu_id;
        u16 reserved_cpus_mask;
        enum loongson_cpu_type cputype;
+       enum loongson_bridge_type bridgetype;
        u64 ht_control_base;
        u64 pci_mem_start_addr;
        u64 pci_mem_end_addr;

diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c
index 2554ef11170d31277534446f59f558de0c4d0fc7..71f4aaf587911a9696287a2f0aac172b67e1b60f 100644 (file)
--- 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;
+       }
 }