--- zzzz-none-000/linux-3.10.107/arch/arm/mach-shmobile/timer.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/arch/arm/mach-shmobile/timer.c	2021-02-04 17:41:59.000000000 +0000
@@ -12,54 +12,68 @@
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
- *
  */
 #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;
 }
 
-static void __init shmobile_late_time_init(void)
+void __init shmobile_init_delay(void)
 {
-	/*
-	 * Make sure all compiled-in early timers register themselves.
-	 *
-	 * Run probe() for two "earlytimer" devices, these will be the
-	 * clockevents and clocksource devices respectively. In the event
-	 * that only a clockevents device is available, we -ENODEV on the
-	 * clocksource and the jiffies clocksource is used transparently
-	 * instead. No error handling is necessary here.
-	 */
-	early_platform_driver_register_all("earlytimer");
-	early_platform_driver_probe("earlytimer", 2, 0);
-}
-
-void __init shmobile_earlytimer_init(void)
-{
-	late_time_init = shmobile_late_time_init;
-}
-
-void __init shmobile_timer_init(void)
-{
-	clocksource_of_init();
+	struct device_node *np, *cpus;
+	bool is_a7_a8_a9 = false;
+	bool is_a15 = false;
+	bool has_arch_timer = 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-a8") ||
+		    of_device_is_compatible(np, "arm,cortex-a9")) {
+			is_a7_a8_a9 = true;
+		} else if (of_device_is_compatible(np, "arm,cortex-a7")) {
+			is_a7_a8_a9 = true;
+			has_arch_timer = true;
+		} else if (of_device_is_compatible(np, "arm,cortex-a15")) {
+			is_a15 = true;
+			has_arch_timer = true;
+		}
+	}
+
+	of_node_put(cpus);
+
+	if (!max_freq)
+		return;
+
+	if (!has_arch_timer || !IS_ENABLED(CONFIG_ARM_ARCH_TIMER)) {
+		if (is_a7_a8_a9)
+			shmobile_setup_delay_hz(max_freq, 1, 3);
+		else if (is_a15)
+			shmobile_setup_delay_hz(max_freq, 2, 4);
+	}
 }