#include <linux/platform_device.h>
#include <linux/clocksource.h>
#include <linux/delay.h>
+#include <linux/of_address.h>
-void __init shmobile_setup_delay(unsigned int max_cpu_core_mhz,
- unsigned int mult, unsigned int div)
+static void __init shmobile_setup_delay_hz(unsigned int max_cpu_core_hz,
+ unsigned int mult, unsigned int div)
{
/* calculate a worst-case loops-per-jiffy value
- * based on maximum cpu core mhz setting and the
+ * based on maximum cpu core hz setting and the
* __delay() implementation in arch/arm/lib/delay.S
*
* this will result in a longer delay than expected
* when the cpu core runs on lower frequencies.
*/
- unsigned int value = (1000000 * mult) / (HZ * div);
+ unsigned int value = HZ * div / mult;
if (!preset_lpj)
- preset_lpj = max_cpu_core_mhz * value;
+ preset_lpj = max_cpu_core_hz / value;
+}
+
+void __init shmobile_init_delay(void)
+{
+ struct device_node *np, *cpus;
+ bool is_a7_a8_a9 = false;
+ bool is_a15 = false;
+ u32 max_freq = 0;
+
+ cpus = of_find_node_by_path("/cpus");
+ if (!cpus)
+ return;
+
+ for_each_child_of_node(cpus, np) {
+ u32 freq;
+
+ if (!of_property_read_u32(np, "clock-frequency", &freq))
+ max_freq = max(max_freq, freq);
+
+ if (of_device_is_compatible(np, "arm,cortex-a7") ||
+ of_device_is_compatible(np, "arm,cortex-a8") ||
+ of_device_is_compatible(np, "arm,cortex-a9"))
+ is_a7_a8_a9 = true;
+ else if (of_device_is_compatible(np, "arm,cortex-a15"))
+ is_a15 = true;
+ }
+
+ of_node_put(cpus);
+
+ if (!max_freq)
+ return;
+
+ if (is_a7_a8_a9)
+ shmobile_setup_delay_hz(max_freq, 1, 3);
+ else if (is_a15 && !IS_ENABLED(CONFIG_ARM_ARCH_TIMER))
+ shmobile_setup_delay_hz(max_freq, 2, 4);
}
static void __init shmobile_late_time_init(void)