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Diffstat (limited to 'arch/arm/mach-shmobile/setup-rcar-gen2.c')
-rw-r--r--arch/arm/mach-shmobile/setup-rcar-gen2.c29
1 files changed, 23 insertions, 6 deletions
diff --git a/arch/arm/mach-shmobile/setup-rcar-gen2.c b/arch/arm/mach-shmobile/setup-rcar-gen2.c
index 5734c24bf6c7..69ccc6c6fd33 100644
--- a/arch/arm/mach-shmobile/setup-rcar-gen2.c
+++ b/arch/arm/mach-shmobile/setup-rcar-gen2.c
@@ -18,6 +18,7 @@
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/clk/shmobile.h>
#include <linux/clocksource.h>
#include <linux/io.h>
#include <linux/kernel.h>
@@ -44,8 +45,10 @@ u32 __init rcar_gen2_read_mode_pins(void)
void __init rcar_gen2_timer_init(void)
{
-#ifdef CONFIG_ARM_ARCH_TIMER
+#if defined(CONFIG_ARM_ARCH_TIMER) || defined(CONFIG_COMMON_CLK)
u32 mode = rcar_gen2_read_mode_pins();
+#endif
+#ifdef CONFIG_ARM_ARCH_TIMER
void __iomem *base;
int extal_mhz = 0;
u32 freq;
@@ -78,14 +81,28 @@ void __init rcar_gen2_timer_init(void)
/* Remap "armgcnt address map" space */
base = ioremap(0xe6080000, PAGE_SIZE);
- /* Update registers with correct frequency */
- iowrite32(freq, base + CNTFID0);
- asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
+ /*
+ * Update the timer if it is either not running, or is not at the
+ * right frequency. The timer is only configurable in secure mode
+ * so this avoids an abort if the loader started the timer and
+ * entered the kernel in non-secure mode.
+ */
+
+ if ((ioread32(base + CNTCR) & 1) == 0 ||
+ ioread32(base + CNTFID0) != freq) {
+ /* Update registers with correct frequency */
+ iowrite32(freq, base + CNTFID0);
+ asm volatile("mcr p15, 0, %0, c14, c0, 0" : : "r" (freq));
+
+ /* make sure arch timer is started by setting bit 0 of CNTCR */
+ iowrite32(1, base + CNTCR);
+ }
- /* make sure arch timer is started by setting bit 0 of CNTCR */
- iowrite32(1, base + CNTCR);
iounmap(base);
#endif /* CONFIG_ARM_ARCH_TIMER */
+#ifdef CONFIG_COMMON_CLK
+ rcar_gen2_clocks_init(mode);
+#endif
clocksource_of_init();
}