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authorMasahiro Yamada <yamada.masahiro@socionext.com>2016-02-26 10:16:08 +0300
committerArnd Bergmann <arnd@arndb.de>2016-03-18 19:36:37 +0300
commit307d40c56b0c86315859ee724b51748260f50e65 (patch)
tree1de7c97153af3e4551af439cf5abbc574d437a3d /arch/arm/mach-uniphier
parent9eca796ee385ee61488fbe62fa83224e13abcfe0 (diff)
downloadlinux-307d40c56b0c86315859ee724b51748260f50e65.tar.xz
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>
Diffstat (limited to 'arch/arm/mach-uniphier')
-rw-r--r--arch/arm/mach-uniphier/platsmp.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/arch/arm/mach-uniphier/platsmp.c b/arch/arm/mach-uniphier/platsmp.c
index 8d988f53318c..69141357afe8 100644
--- a/arch/arm/mach-uniphier/platsmp.c
+++ b/arch/arm/mach-uniphier/platsmp.c
@@ -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;