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authorGregory CLEMENT <gregory.clement@free-electrons.com>2014-07-23 17:00:51 +0400
committerJason Cooper <jason@lakedaemon.net>2014-07-24 15:47:37 +0400
commit3b9e4b1441aedcb26079f690aa11f3f9f93e5182 (patch)
tree9d121f165ccf45fc5161b0b57989d863af4e95dc /arch/arm/mach-mvebu/pmsu.c
parentc16788b431d708afb73ffdd41fd8a16ab11bf89e (diff)
downloadlinux-3b9e4b1441aedcb26079f690aa11f3f9f93e5182.tar.xz
ARM: mvebu: add cpuidle support for Armada 370
This commit introduces the cpuidle support for Armada 370. The main difference compared to the already supported Armada XP is that the Armada 370 has an issue caused by "a slow exit process from the deep idle state due to heavy L1/L2 cache cleanup operations performed by the BootROM software" (cf errata GL-BootROM-10). To work around this issue, we replace the restart code of the BootROM by some custom code located in an internal SRAM. For this purpose, we use the common function mvebu_boot_addr_wa() introduced in the commit "ARM: mvebu: Add a common function for the boot address work around". The message in case of failure to suspend the system was switched from the warn level to the debug level. Indeed due to the "slow exit process from the deep idle state" in Armada 370, this situation happens quite often. Using the debug level avoids spamming the kernel logs, but still allows to enable it if needed. Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Link: https://lkml.kernel.org/r/1406120453-29291-15-git-send-email-thomas.petazzoni@free-electrons.com Signed-off-by: Jason Cooper <jason@lakedaemon.net>
Diffstat (limited to 'arch/arm/mach-mvebu/pmsu.c')
-rw-r--r--arch/arm/mach-mvebu/pmsu.c51
1 files changed, 44 insertions, 7 deletions
diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
index 0cd2d09475aa..9190ae8626cf 100644
--- a/arch/arm/mach-mvebu/pmsu.c
+++ b/arch/arm/mach-mvebu/pmsu.c
@@ -34,7 +34,6 @@
#include <asm/tlbflush.h>
#include "common.h"
-static void __iomem *pmsu_mp_base;
#define PMSU_BASE_OFFSET 0x100
#define PMSU_REG_SIZE 0x1000
@@ -68,17 +67,18 @@ static void __iomem *pmsu_mp_base;
#define BOOTROM_BASE 0xFFF00000
#define BOOTROM_SIZE 0x100000
+#define ARMADA_370_CRYPT0_ENG_TARGET 0x9
+#define ARMADA_370_CRYPT0_ENG_ATTR 0x1
+
extern void ll_disable_coherency(void);
extern void ll_enable_coherency(void);
extern void armada_370_xp_cpu_resume(void);
+static phys_addr_t pmsu_mp_phys_base;
+static void __iomem *pmsu_mp_base;
static void *mvebu_cpu_resume;
-static struct platform_device mvebu_v7_cpuidle_device = {
- .name = "cpuidle-armada-xp",
-};
-
static struct of_device_id of_pmsu_table[] = {
{ .compatible = "marvell,armada-370-pmsu", },
{ .compatible = "marvell,armada-370-xp-pmsu", },
@@ -165,6 +165,8 @@ static int __init mvebu_v7_pmsu_init(void)
goto out;
}
+ pmsu_mp_phys_base = res.start;
+
pmsu_mp_base = ioremap(res.start, resource_size(&res));
if (!pmsu_mp_base) {
pr_err("unable to map registers\n");
@@ -275,7 +277,7 @@ int armada_370_xp_pmsu_idle_enter(unsigned long deepidle)
"isb "
: : : "r0");
- pr_warn("Failed to suspend the system\n");
+ pr_debug("Failed to suspend the system\n");
return 0;
}
@@ -325,7 +327,39 @@ static struct notifier_block mvebu_v7_cpu_pm_notifier = {
.notifier_call = mvebu_v7_cpu_pm_notify,
};
-static int __init armada_xp_cpuidle_init(void)
+static struct platform_device mvebu_v7_cpuidle_device;
+
+static __init int armada_370_cpuidle_init(void)
+{
+ struct device_node *np;
+ phys_addr_t redirect_reg;
+
+ np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
+ if (!np)
+ return -ENODEV;
+ of_node_put(np);
+
+ /*
+ * On Armada 370, there is "a slow exit process from the deep
+ * idle state due to heavy L1/L2 cache cleanup operations
+ * performed by the BootROM software". To avoid this, we
+ * replace the restart code of the bootrom by a a simple jump
+ * to the boot address. Then the code located at this boot
+ * address will take care of the initialization.
+ */
+ redirect_reg = pmsu_mp_phys_base + PMSU_BOOT_ADDR_REDIRECT_OFFSET(0);
+ mvebu_setup_boot_addr_wa(ARMADA_370_CRYPT0_ENG_TARGET,
+ ARMADA_370_CRYPT0_ENG_ATTR,
+ redirect_reg);
+
+ mvebu_cpu_resume = armada_370_xp_cpu_resume;
+ mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
+ mvebu_v7_cpuidle_device.name = "cpuidle-armada-370";
+
+ return 0;
+}
+
+static __init int armada_xp_cpuidle_init(void)
{
struct device_node *np;
@@ -336,6 +370,7 @@ static int __init armada_xp_cpuidle_init(void)
mvebu_cpu_resume = armada_370_xp_cpu_resume;
mvebu_v7_cpuidle_device.dev.platform_data = armada_370_xp_cpu_suspend;
+ mvebu_v7_cpuidle_device.name = "cpuidle-armada-xp";
return 0;
}
@@ -352,6 +387,8 @@ static int __init mvebu_v7_cpu_pm_init(void)
if (of_machine_is_compatible("marvell,armadaxp"))
ret = armada_xp_cpuidle_init();
+ else if (of_machine_is_compatible("marvell,armada370"))
+ ret = armada_370_cpuidle_init();
else
return 0;