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riscv: Fix builtin DTB handling

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All SiPeed K210 MAIX boards have the exact same vendor, arch and
implementation IDs, preventing differentiation to select the correct
device tree to use through the SOC_BUILTIN_DTB_DECLARE() macro. This
result in this macro to be useless and mandates changing the code of
the sysctl driver to change the builtin device tree suitable for the
target board.

Fix this problem by removing the SOC_BUILTIN_DTB_DECLARE() macro since
it is used only for the K210 support. The code searching the builtin
DTBs using the vendor, arch an implementation IDs is also removed.
Support for builtin DTB falls back to the simpler and more traditional
handling of builtin DTB using the CONFIG_BUILTIN_DTB option, similarly
to other architectures.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Damien Le Moal 2020-12-13 22:50:37 +09:00 committed by Palmer Dabbelt
parent d573b5558a
commit d5805af9fe
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
7 changed files with 19 additions and 90 deletions
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19
arch/riscv/Kconfig.socs
View File

@ -32,9 +32,7 @@ config SOC_KENDRYTE
help
This enables support for Kendryte K210 SoC platform hardware.
config SOC_KENDRYTE_K210_DTB
def_bool y
depends on SOC_KENDRYTE_K210_DTB_BUILTIN
if SOC_KENDRYTE
config SOC_KENDRYTE_K210_DTB_BUILTIN
bool "Builtin device tree for the Kendryte K210"
@ -42,10 +40,21 @@ config SOC_KENDRYTE_K210_DTB_BUILTIN
default y
select OF
select BUILTIN_DTB
select SOC_KENDRYTE_K210_DTB
help
Builds a device tree for the Kendryte K210 into the Linux image.
Build a device tree for the Kendryte K210 into the Linux image.
This option should be selected if no bootloader is being used.
If unsure, say Y.
config SOC_KENDRYTE_K210_DTB_SOURCE
string "Source file for the Kendryte K210 builtin DTB"
depends on SOC_KENDRYTE
depends on SOC_KENDRYTE_K210_DTB_BUILTIN
default "k210"
help
Base name (without suffix, relative to arch/riscv/boot/dts/kendryte)
for the DTS file that will be used to produce the DTB linked into the
kernel.
endif
endmenu

2
arch/riscv/boot/dts/Makefile
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@ -1,5 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
subdir-y += sifive
subdir-y += kendryte
subdir-$(CONFIG_SOC_KENDRYTE) += kendryte
obj-$(CONFIG_BUILTIN_DTB) := $(addsuffix /, $(subdir-y))

5
arch/riscv/boot/dts/kendryte/Makefile
View File

@ -1,4 +1,5 @@
# SPDX-License-Identifier: GPL-2.0
dtb-$(CONFIG_SOC_KENDRYTE_K210_DTB) += k210.dtb
ifneq ($(CONFIG_SOC_KENDRYTE_K210_DTB_SOURCE),"")
dtb-y += $(strip $(shell echo $(CONFIG_SOC_KENDRYTE_K210_DTB_SOURCE))).dtb
obj-$(CONFIG_SOC_KENDRYTE_K210_DTB_BUILTIN) += $(addsuffix .o, $(dtb-y))
endif

38
arch/riscv/include/asm/soc.h
View File

@ -21,42 +21,4 @@ void soc_early_init(void);
extern unsigned long __soc_early_init_table_start;
extern unsigned long __soc_early_init_table_end;
/*
* Allows Linux to provide a device tree, which is necessary for SOCs that
* don't provide a useful one on their own.
*/
struct soc_builtin_dtb {
unsigned long vendor_id;
unsigned long arch_id;
unsigned long imp_id;
void *(*dtb_func)(void);
};
/*
* The argument name must specify a valid DTS file name without the dts
* extension.
*/
#define SOC_BUILTIN_DTB_DECLARE(name, vendor, arch, impl) \
extern void *__dtb_##name##_begin; \
\
static __init __used \
void *__soc_builtin_dtb_f__##name(void) \
{ \
return (void *)&__dtb_##name##_begin; \
} \
\
static const struct soc_builtin_dtb __soc_builtin_dtb__##name \
__used __section("__soc_builtin_dtb_table") = \
{ \
.vendor_id = vendor, \
.arch_id = arch, \
.imp_id = impl, \
.dtb_func = __soc_builtin_dtb_f__##name, \
}
extern unsigned long __soc_builtin_dtb_table_start;
extern unsigned long __soc_builtin_dtb_table_end;
void *soc_lookup_builtin_dtb(void);
#endif

27
arch/riscv/kernel/soc.c
View File

@ -26,30 +26,3 @@ void __init soc_early_init(void)
}
}
}
static bool soc_builtin_dtb_match(unsigned long vendor_id,
unsigned long arch_id, unsigned long imp_id,
const struct soc_builtin_dtb *entry)
{
return entry->vendor_id == vendor_id &&
entry->arch_id == arch_id &&
entry->imp_id == imp_id;
}
void * __init soc_lookup_builtin_dtb(void)
{
unsigned long vendor_id, arch_id, imp_id;
const struct soc_builtin_dtb *s;
__asm__ ("csrr %0, mvendorid" : "=r"(vendor_id));
__asm__ ("csrr %0, marchid" : "=r"(arch_id));
__asm__ ("csrr %0, mimpid" : "=r"(imp_id));
for (s = (void *)&__soc_builtin_dtb_table_start;
(void *)s < (void *)&__soc_builtin_dtb_table_end; s++) {
if (soc_builtin_dtb_match(vendor_id, arch_id, imp_id, s))
return s->dtb_func();
}
return NULL;
}

6
arch/riscv/mm/init.c
View File

@ -605,11 +605,7 @@ static void __init setup_vm_final(void)
asmlinkage void __init setup_vm(uintptr_t dtb_pa)
{
#ifdef CONFIG_BUILTIN_DTB
dtb_early_va = soc_lookup_builtin_dtb();
if (!dtb_early_va) {
/* Fallback to first available DTS */
dtb_early_va = (void *) __dtb_start;
}
dtb_early_va = (void *) __dtb_start;
#else
dtb_early_va = (void *)dtb_pa;
#endif

12
drivers/soc/kendryte/k210-sysctl.c
View File

@ -246,15 +246,3 @@ static void __init k210_soc_early_init(const void *fdt)
iounmap(regs);
}
SOC_EARLY_INIT_DECLARE(generic_k210, "kendryte,k210", k210_soc_early_init);
#ifdef CONFIG_SOC_KENDRYTE_K210_DTB_BUILTIN
/*
* Generic entry for the default k210.dtb embedded DTB for boards with:
* - Vendor ID: 0x4B5
* - Arch ID: 0xE59889E6A5A04149 (= "Canaan AI" in UTF-8 encoded Chinese)
* - Impl ID: 0x4D41495832303030 (= "MAIX2000")
* These values are reported by the SiPEED MAXDUINO, SiPEED MAIX GO and
* SiPEED Dan dock boards.
*/
SOC_BUILTIN_DTB_DECLARE(k210, 0x4B5, 0xE59889E6A5A04149, 0x4D41495832303030);
#endif