linux-kernel - [PATCH v2 1/3] MIPS: Loongson: Get host bridge information

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Message-Id: <1584932355-3642-2-git-send-email-yangtiezhu@loongson.cn>
Date:   Mon, 23 Mar 2020 10:59:13 +0800
From:   Tiezhu Yang <yangtiezhu@...ngson.cn>
To:     Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Huacai Chen <chenhc@...ote.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     linux-mips@...r.kernel.org, linux-kernel@...r.kernel.org,
        Xuefeng Li <lixuefeng@...ngson.cn>
Subject: [PATCH v2 1/3] MIPS: Loongson: Get host bridge information

Read the address of HyperTransport Configuration Space to get the vendor ID
and device ID of bridge chip, and then we can distinguish various types of
bridge chip such as Loongson 7A1000 or AMD RS780E.

Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
---
 arch/mips/include/asm/mach-loongson64/boot_param.h |  6 ++++++
 arch/mips/loongson64/env.c                         | 16 ++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
index 8c286be..5e8c70d 100644
--- a/arch/mips/include/asm/mach-loongson64/boot_param.h
+++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
@@ -190,6 +190,11 @@ struct boot_params {
 	struct efi_reset_system_t reset_system;
 };
 
+enum loongson_bridge_type {
+	RS780E = 1,
+	LS7A1000 = 2
+};
+
 struct loongson_system_configuration {
 	u32 nr_cpus;
 	u32 nr_nodes;
@@ -198,6 +203,7 @@ 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 0daeb7b..42542c7 100644
--- a/arch/mips/loongson64/env.c
+++ b/arch/mips/loongson64/env.c
@@ -19,6 +19,8 @@
 #include <boot_param.h>
 #include <workarounds.h>
 
+#define HT1_LO_BUS_CONFIG_BASE	0x90000efdfe000000
+
 u32 cpu_clock_freq;
 EXPORT_SYMBOL(cpu_clock_freq);
 struct efi_memory_map_loongson *loongson_memmap;
@@ -42,6 +44,8 @@ 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;
@@ -155,4 +159,16 @@ 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);
+
+	id = readl((u32 *)HT1_LO_BUS_CONFIG_BASE);
+	vendor = id & 0xffff;
+	device = (id >> 16) & 0xffff;
+
+	if (vendor == 0x0014 && device == 0x7a00) {
+		pr_info("The bridge chip is Loongson 7A1000\n");
+		loongson_sysconf.bridgetype = LS7A1000;
+	} else {
+		pr_info("The bridge chip is AMD RS780E or SR5690\n");
+		loongson_sysconf.bridgetype = RS780E;
+	}
 }
-- 
2.1.0