linux-mips.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Tiezhu Yang <yangtiezhu@loongson.cn>
To: Paul Burton <paulburton@kernel.org>,
	Ralf Baechle <ralf@linux-mips.org>,
	James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org, linux-kernel@vger.kernel.org,
	Yinglu Yang <yangyinglu@loongson.cn>
Subject: [PATCH] MIPS: Scan the DMI system information
Date: Thu,  7 Nov 2019 00:05:41 +0800	[thread overview]
Message-ID: <1573056341-21159-1-git-send-email-yangtiezhu@loongson.cn> (raw)

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.

Co-developed-by: Yinglu Yang <yangyinglu@loongson.cn>
Signed-off-by: Yinglu Yang <yangyinglu@loongson.cn>
Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>
---
 arch/mips/Kconfig           | 12 ++++++++++++
 arch/mips/include/asm/dmi.h | 43 +++++++++++++++++++++++++++++++++++++++++++
 arch/mips/kernel/setup.c    |  2 ++
 3 files changed, 57 insertions(+)
 create mode 100644 arch/mips/include/asm/dmi.h

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index 7cb8947..0a67b18 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2757,6 +2757,18 @@ config HW_PERF_EVENTS
 	  Enable hardware performance counter support for perf events. If
 	  disabled, perf events will use software events only.
 
+# Mark as expert because too many people got it wrong.
+# The code disables itself when not needed.
+config DMI
+	default y
+	select DMI_SCAN_MACHINE_NON_EFI_FALLBACK
+	bool "Enable DMI scanning" if EXPERT
+	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 0000000..1f3da37
--- /dev/null
+++ b/arch/mips/include/asm/dmi.h
@@ -0,0 +1,43 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_MIPS_DMI_H
+#define _ASM_MIPS_DMI_H
+
+#define dmi_early_remap		mips_early_memremap
+#define dmi_early_unmap		mips_early_memunmap
+#define dmi_remap(_x, _l)	mips_memremap(_x, _l, MEMREMAP_WB)
+#define dmi_unmap(_x)		mips_memunmap(_x)
+
+#define dmi_alloc(l)		memblock_alloc_low(l, PAGE_SIZE)
+
+void __init *mips_early_memremap(resource_size_t phys_addr, unsigned long size)
+{
+#if defined(CONFIG_MACH_LOONGSON64)
+	if (phys_addr == 0xF0000)
+		phys_addr = 0xFFFE000;
+
+	return (void *)TO_CAC(phys_addr);
+#else
+	return NULL;
+#endif
+}
+
+void __init mips_early_memunmap(void *addr, unsigned long size)
+{
+
+}
+
+void *mips_memremap(resource_size_t offset, size_t size, unsigned long flags)
+{
+#if defined(CONFIG_MACH_LOONGSON64)
+	return (void *)TO_CAC(offset);
+#else
+	return NULL;
+#endif
+}
+
+void mips_memunmap(void *addr)
+{
+
+}
+
+#endif /* _ASM_MIPS_DMI_H */
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index c3d4212..da7d312 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>
@@ -802,6 +803,7 @@ void __init setup_arch(char **cmdline_p)
 #endif
 
 	arch_mem_init(cmdline_p);
+	dmi_setup();
 
 	resource_init();
 	plat_smp_setup();
-- 
2.1.0



             reply	other threads:[~2019-11-06 16:06 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-06 16:05 Tiezhu Yang [this message]
2019-11-07  0:35 ` [PATCH] MIPS: Scan the DMI system information Jiaxun Yang
2019-11-07  2:42   ` Tiezhu Yang
2019-11-07  3:42     ` Jiaxun Yang
     [not found] <5959f904-5c46-30a7-7a4f-17f692aca320@loongson.cn>
2019-11-07  9:26 ` Tiezhu Yang
2019-11-07 10:42   ` Jean Delvare
2019-11-07 11:07     ` Tiezhu Yang

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1573056341-21159-1-git-send-email-yangtiezhu@loongson.cn \
    --to=yangtiezhu@loongson.cn \
    --cc=jhogan@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mips@vger.kernel.org \
    --cc=paulburton@kernel.org \
    --cc=ralf@linux-mips.org \
    --cc=yangyinglu@loongson.cn \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).