openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

ARM: uniphier: rework SMP code to support new System Bus binding 

During the review process of the UniPhier System Bus driver
(drivers/bus/uniphier.c), the current binding of the System Bus
Controller turned out to be no good.  In order to use the driver,
some nodes in the device trees must be tweaked.  It would also have
impacts on the SMP code because the SMP related registers are
located in the System Bus Controller block.  This commit reworks
the smp_operations to support the new binding, but still supports
the old binding, too.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Masahiro Yamada 2016-02-26 16:16:08 +09:00 committed by Arnd Bergmann
parent 9eca796ee3
commit 307d40c56b
1 changed files with 16 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
arch/arm/mach-uniphier/platsmp.c
View File

@ -30,7 +30,7 @@
* The secondary CPUs check this register from the boot ROM for the jump
* destination. After that, it can be reused as a scratch register.
*/
#define UNIPHIER_SBC_ROM_BOOT_RSV2 0x1208
#define UNIPHIER_SMPCTRL_ROM_RSV2 0x208
static void __iomem *uniphier_smp_rom_boot_rsv2;
static unsigned int uniphier_smp_max_cpus;
@ -98,17 +98,24 @@ static int __init uniphier_smp_prepare_trampoline(unsigned int max_cpus)
phys_addr_t rom_rsv2_phys;
int ret;
np = of_find_compatible_node(NULL, NULL,
"socionext,uniphier-system-bus-controller");
np = of_find_compatible_node(NULL, NULL, "socionext,uniphier-smpctrl");
of_node_put(np);
ret = of_address_to_resource(np, 1, &res);
if (ret) {
pr_err("failed to get resource of system-bus-controller\n");
return ret;
ret = of_address_to_resource(np, 0, &res);
if (!ret) {
rom_rsv2_phys = res.start + UNIPHIER_SMPCTRL_ROM_RSV2;
} else {
/* try old binding too */
np = of_find_compatible_node(NULL, NULL,
"socionext,uniphier-system-bus-controller");
of_node_put(np);
ret = of_address_to_resource(np, 1, &res);
if (ret) {
pr_err("failed to get resource of SMP control\n");
return ret;
}
rom_rsv2_phys = res.start + 0x1000 + UNIPHIER_SMPCTRL_ROM_RSV2;
}
rom_rsv2_phys = res.start + UNIPHIER_SBC_ROM_BOOT_RSV2;
ret = uniphier_smp_copy_trampoline(rom_rsv2_phys);
if (ret)
return ret;