[PATCH v2 3/4 RESEND] MIPS: Loongson64: Add /proc/boardinfo

[Tiezhu Yang <yangtiezhu@loongson.cn>]

Add /proc/boardinfo to get mainboard and BIOS info easily on the Loongson
platform, this is useful to point out the current used mainboard type and
BIOS version when there exists problems related with hardware or firmware.

E.g. with this patch:

[loongson@linux ~]$ cat /proc/boardinfo
Board Info
Manufacturer            : LEMOTE
Board Name              : LEMOTE-LS3A4000-7A1000-1w-V01-pc
Family                  : LOONGSON3

BIOS Info
Vendor                  : Kunlun
Version                 : Kunlun-A1901-V4.1.3-20200414093938
ROM Size                : 4 KB
Release Date            : 2020-04-14

Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---

v2: no changes

 arch/mips/include/asm/mach-loongson64/boot_param.h |  4 +++
 arch/mips/loongson64/Makefile                      |  2 +-
 arch/mips/loongson64/boardinfo.c                   | 40 ++++++++++++++++++++++
 arch/mips/loongson64/env.c                         | 10 ++++++
 4 files changed, 55 insertions(+), 1 deletion(-)
 create mode 100644 arch/mips/loongson64/boardinfo.c

diff --git a/arch/mips/include/asm/mach-loongson64/boot_param.h b/arch/mips/include/asm/mach-loongson64/boot_param.h
index afc92b7..4592841 100644
--- a/arch/mips/include/asm/mach-loongson64/boot_param.h
+++ b/arch/mips/include/asm/mach-loongson64/boot_param.h
@@ -228,6 +228,10 @@ struct loongson_system_configuration {
 extern struct efi_memory_map_loongson *loongson_memmap;
 extern struct loongson_system_configuration loongson_sysconf;
 
+extern struct board_devices *eboard;
+extern struct interface_info *einter;
+extern struct loongson_special_attribute *especial;
+
 extern u32 node_id_offset;
 extern void ls7a_early_config(void);
 extern void rs780e_early_config(void);
diff --git a/arch/mips/loongson64/Makefile b/arch/mips/loongson64/Makefile
index 39c06f5..bc77b5a 100644
--- a/arch/mips/loongson64/Makefile
+++ b/arch/mips/loongson64/Makefile
@@ -3,7 +3,7 @@
 # Makefile for Loongson-3 family machines
 #
 obj-$(CONFIG_MACH_LOONGSON64) += cop2-ex.o platform.o dma.o \
-				setup.o init.o env.o time.o reset.o \
+				setup.o init.o env.o time.o reset.o boardinfo.o\
 
 obj-$(CONFIG_SMP)	+= smp.o
 obj-$(CONFIG_NUMA)	+= numa.o
diff --git a/arch/mips/loongson64/boardinfo.c b/arch/mips/loongson64/boardinfo.c
new file mode 100644
index 0000000..2e8086b
--- /dev/null
+++ b/arch/mips/loongson64/boardinfo.c
@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/fs.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/module.h>
+#include <boot_param.h>
+
+static int loongson_boardinfo_proc_show(struct seq_file *m, void *v)
+{
+	char board_manufacturer[64] = {0};
+	char *tmp_board_manufacturer = board_manufacturer;
+	char bios_vendor[64] = {0};
+	char *tmp_bios_vendor = bios_vendor;
+
+	strcpy(board_manufacturer, eboard->name);
+	strcpy(bios_vendor, einter->description);
+
+	seq_puts(m, "Board Info\n");
+	seq_printf(m, "Manufacturer\t\t: %s\n", strsep(&tmp_board_manufacturer, "-"));
+	seq_printf(m, "Board Name\t\t: %s\n", eboard->name);
+	seq_puts(m, "Family\t\t\t: LOONGSON3\n");
+	seq_puts(m, "\n");
+
+	seq_puts(m, "BIOS Info\n");
+	seq_printf(m, "Vendor\t\t\t: %s\n", strsep(&tmp_bios_vendor, "-"));
+	seq_printf(m, "Version\t\t\t: %s\n", einter->description);
+	seq_printf(m, "ROM Size\t\t: %d KB\n", einter->size);
+	seq_printf(m, "Release Date\t\t: %s\n", especial->special_name);
+
+	return 0;
+}
+
+static int __init proc_boardinfo_init(void)
+{
+	proc_create_single("boardinfo", 0, NULL, loongson_boardinfo_proc_show);
+	return 0;
+}
+
+module_init(proc_boardinfo_init);
diff --git a/arch/mips/loongson64/env.c b/arch/mips/loongson64/env.c
index 134cb8e..51a5d05 100644
--- a/arch/mips/loongson64/env.c
+++ b/arch/mips/loongson64/env.c
@@ -28,6 +28,10 @@ EXPORT_SYMBOL(cpu_clock_freq);
 struct efi_memory_map_loongson *loongson_memmap;
 struct loongson_system_configuration loongson_sysconf;
 
+struct board_devices *eboard;
+struct interface_info *einter;
+struct loongson_special_attribute *especial;
+
 u64 loongson_chipcfg[MAX_PACKAGES] = {0xffffffffbfc00180};
 u64 loongson_chiptemp[MAX_PACKAGES];
 u64 loongson_freqctrl[MAX_PACKAGES];
@@ -57,6 +61,12 @@ void __init prom_init_env(void)
 		((u64)loongson_p + loongson_p->system_offset);
 	ecpu = (struct efi_cpuinfo_loongson *)
 		((u64)loongson_p + loongson_p->cpu_offset);
+	eboard = (struct board_devices *)
+		((u64)loongson_p + loongson_p->boarddev_table_offset);
+	einter = (struct interface_info *)
+		((u64)loongson_p + loongson_p->interface_offset);
+	especial = (struct loongson_special_attribute *)
+		((u64)loongson_p + loongson_p->special_offset);
 	eirq_source = (struct irq_source_routing_table *)
 		((u64)loongson_p + loongson_p->irq_offset);
 	loongson_memmap = (struct efi_memory_map_loongson *)
-- 
2.1.0