ARM: at91/pm: move the copying the sram function to the sram initialization phase
To decrease the suspend time, move copying the sram function to the sram
initialization phase, instead of every time go to suspend.
In the meanwhile, substitute fncpy() for memcpy().
If there is no sram allocated for PM, the PM is not supported.
Signed-off-by: Wenyou Yang <wenyou.yang@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Tested-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
diff --git a/arch/arm/mach-at91/pm.c b/arch/arm/mach-at91/pm.c
index ea4d888..7cb3a33 100644
--- a/arch/arm/mach-at91/pm.c
+++ b/arch/arm/mach-at91/pm.c
@@ -29,6 +29,7 @@
#include <linux/atomic.h>
#include <asm/mach/time.h>
#include <asm/mach/irq.h>
+#include <asm/fncpy.h>
#include <mach/cpu.h>
#include <mach/hardware.h>
@@ -149,9 +150,6 @@
* turning off the main oscillator; reverse on wakeup.
*/
if (slow_clock) {
- /* copy slow_clock handler to SRAM, and call it */
- memcpy(slow_clock, at91_slow_clock, at91_slow_clock_sz);
-
slow_clock(at91_pmc_base, at91_ramc_base[0],
at91_ramc_base[1],
at91_pm_data.memctrl);
@@ -295,6 +293,13 @@
sram_pbase = gen_pool_virt_to_phys(sram_pool, sram_base);
slow_clock = __arm_ioremap_exec(sram_pbase, at91_slow_clock_sz, false);
+ if (!slow_clock) {
+ pr_warn("SRAM: Could not map\n");
+ return;
+ }
+
+ /* Copy the slow_clock handler to SRAM */
+ slow_clock = fncpy(slow_clock, &at91_slow_clock, at91_slow_clock_sz);
}
static void __init at91_pm_init(void)
@@ -304,7 +309,10 @@
if (at91_cpuidle_device.dev.platform_data)
platform_device_register(&at91_cpuidle_device);
- suspend_set_ops(&at91_pm_ops);
+ if (slow_clock)
+ suspend_set_ops(&at91_pm_ops);
+ else
+ pr_info("AT91: PM not supported, due to no SRAM allocated\n");
}
void __init at91rm9200_pm_init(void)
