summaryrefslogtreecommitdiffstats
path: root/arch/mips
diff options
context:
space:
mode:
authorTiezhu Yang <yangtiezhu@loongson.cn>2020-02-05 12:08:33 +0800
committerThomas Bogendoerfer <tsbogend@alpha.franken.de>2020-03-23 15:44:05 +0100
commitbe8fa1cb444cdf3dcab72053939d073394886ff8 (patch)
tree4d8a4390bd3ea208b6eb87222985a415d48aa11f /arch/mips
parent3da27a4eb8c214d692e024473415fe7d2e88e7d7 (diff)
downloadlinux-be8fa1cb444cdf3dcab72053939d073394886ff8.tar.bz2
MIPS: Add support for Desktop Management Interface (DMI)
Enable DMI scanning on the MIPS architecture, this setups DMI identifiers (dmi_system_id) for printing it out on task dumps and prepares DIMM entry information (dmi_memdev_info) from the SMBIOS table. With this patch, the driver can easily match various of mainboards. In the SMBIOS reference specification, the table anchor string "_SM_" is present in the address range 0xF0000 to 0xFFFFF on a 16-byte boundary, but there exists a special case for Loongson platform, when call function dmi_early_remap, it should specify the start address to 0xFFFE000 due to it is reserved for SMBIOS and can be normally access in the BIOS. This patch works fine on the Loongson 3A3000 platform which belongs to MIPS architecture and has no influence on the other architectures such as x86 and ARM. Additionally, in order to avoid the unknown risks on the mips platform which is not MACH_LOONGSON64, the DMI config is better to depend on MACH_LOONGSON64. If other mips platform also needs this DMI feature in the future, the "depends on" condition can be modified. Co-developed-by: Yinglu Yang <yangyinglu@loongson.cn> Signed-off-by: Yinglu Yang <yangyinglu@loongson.cn> [jiaxun.yang@flygoat.com: Refine definitions and Kconfig] Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn> Reviewed-by: Huacai Chen <chenhc@lemote.com> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/Kconfig11
-rw-r--r--arch/mips/include/asm/dmi.h20
-rw-r--r--arch/mips/kernel/setup.c2
3 files changed, 33 insertions, 0 deletions
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 27f800f1875c..ca3045b2a2d9 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2758,6 +2758,17 @@ config HW_PERF_EVENTS
Enable hardware performance counter support for perf events. If
disabled, perf events will use software events only.
+config DMI
+ bool "Enable DMI scanning"
+ depends on MACH_LOONGSON64
+ select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
+ default y
+ help
+ Enabled scanning of DMI to identify machine quirks. Say Y
+ here unless you have verified that your setup is not
+ affected by entries in the DMI blacklist. Required by PNP
+ BIOS code.
+
config SMP
bool "Multi-Processing support"
depends on SYS_SUPPORTS_SMP
diff --git a/arch/mips/include/asm/dmi.h b/arch/mips/include/asm/dmi.h
new file mode 100644
index 000000000000..27415a288adf
--- /dev/null
+++ b/arch/mips/include/asm/dmi.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_DMI_H
+#define _ASM_DMI_H
+
+#include <linux/io.h>
+#include <linux/memblock.h>
+
+#define dmi_early_remap(x, l) ioremap_cache(x, l)
+#define dmi_early_unmap(x, l) iounmap(x)
+#define dmi_remap(x, l) ioremap_cache(x, l)
+#define dmi_unmap(x) iounmap(x)
+
+/* MIPS initialize DMI scan before SLAB is ready, so we use memblock here */
+#define dmi_alloc(l) memblock_alloc_low(l, PAGE_SIZE)
+
+#if defined(CONFIG_MACH_LOONGSON64)
+#define SMBIOS_ENTRY_POINT_SCAN_START 0xFFFE000
+#endif
+
+#endif /* _ASM_DMI_H */
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index a7b469d89e2c..10bef8f78e7c 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -28,6 +28,7 @@
#include <linux/decompress/generic.h>
#include <linux/of_fdt.h>
#include <linux/of_reserved_mem.h>
+#include <linux/dmi.h>
#include <asm/addrspace.h>
#include <asm/bootinfo.h>
@@ -799,6 +800,7 @@ void __init setup_arch(char **cmdline_p)
#endif
arch_mem_init(cmdline_p);
+ dmi_setup();
resource_init();
plat_smp_setup();