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Diffstat (limited to 'drivers/soc/qcom/kryo-l2-accessors.c')
-rw-r--r--drivers/soc/qcom/kryo-l2-accessors.c57
1 files changed, 57 insertions, 0 deletions
diff --git a/drivers/soc/qcom/kryo-l2-accessors.c b/drivers/soc/qcom/kryo-l2-accessors.c
new file mode 100644
index 000000000..7886af4fd
--- /dev/null
+++ b/drivers/soc/qcom/kryo-l2-accessors.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/spinlock.h>
+#include <asm/barrier.h>
+#include <asm/sysreg.h>
+#include <soc/qcom/kryo-l2-accessors.h>
+
+#define L2CPUSRSELR_EL1 sys_reg(3, 3, 15, 0, 6)
+#define L2CPUSRDR_EL1 sys_reg(3, 3, 15, 0, 7)
+
+static DEFINE_RAW_SPINLOCK(l2_access_lock);
+
+/**
+ * kryo_l2_set_indirect_reg() - write value to an L2 register
+ * @reg: Address of L2 register.
+ * @val: Value to be written to register.
+ *
+ * Use architecturally required barriers for ordering between system register
+ * accesses, and system registers with respect to device memory
+ */
+void kryo_l2_set_indirect_reg(u64 reg, u64 val)
+{
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&l2_access_lock, flags);
+ write_sysreg_s(reg, L2CPUSRSELR_EL1);
+ isb();
+ write_sysreg_s(val, L2CPUSRDR_EL1);
+ isb();
+ raw_spin_unlock_irqrestore(&l2_access_lock, flags);
+}
+EXPORT_SYMBOL(kryo_l2_set_indirect_reg);
+
+/**
+ * kryo_l2_get_indirect_reg() - read an L2 register value
+ * @reg: Address of L2 register.
+ *
+ * Use architecturally required barriers for ordering between system register
+ * accesses, and system registers with respect to device memory
+ */
+u64 kryo_l2_get_indirect_reg(u64 reg)
+{
+ u64 val;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&l2_access_lock, flags);
+ write_sysreg_s(reg, L2CPUSRSELR_EL1);
+ isb();
+ val = read_sysreg_s(L2CPUSRDR_EL1);
+ raw_spin_unlock_irqrestore(&l2_access_lock, flags);
+
+ return val;
+}
+EXPORT_SYMBOL(kryo_l2_get_indirect_reg);