58 lines · c
1// SPDX-License-Identifier: GPL-2.02/*3 * Copyright (c) 2018, The Linux Foundation. All rights reserved.4 */5 6#include <linux/spinlock.h>7#include <asm/barrier.h>8#include <asm/sysreg.h>9#include <soc/qcom/kryo-l2-accessors.h>10 11#define L2CPUSRSELR_EL1 sys_reg(3, 3, 15, 0, 6)12#define L2CPUSRDR_EL1 sys_reg(3, 3, 15, 0, 7)13 14static DEFINE_RAW_SPINLOCK(l2_access_lock);15 16/**17 * kryo_l2_set_indirect_reg() - write value to an L2 register18 * @reg: Address of L2 register.19 * @val: Value to be written to register.20 *21 * Use architecturally required barriers for ordering between system register22 * accesses, and system registers with respect to device memory23 */24void kryo_l2_set_indirect_reg(u64 reg, u64 val)25{26 unsigned long flags;27 28 raw_spin_lock_irqsave(&l2_access_lock, flags);29 write_sysreg_s(reg, L2CPUSRSELR_EL1);30 isb();31 write_sysreg_s(val, L2CPUSRDR_EL1);32 isb();33 raw_spin_unlock_irqrestore(&l2_access_lock, flags);34}35EXPORT_SYMBOL_GPL(kryo_l2_set_indirect_reg);36 37/**38 * kryo_l2_get_indirect_reg() - read an L2 register value39 * @reg: Address of L2 register.40 *41 * Use architecturally required barriers for ordering between system register42 * accesses, and system registers with respect to device memory43 */44u64 kryo_l2_get_indirect_reg(u64 reg)45{46 u64 val;47 unsigned long flags;48 49 raw_spin_lock_irqsave(&l2_access_lock, flags);50 write_sysreg_s(reg, L2CPUSRSELR_EL1);51 isb();52 val = read_sysreg_s(L2CPUSRDR_EL1);53 raw_spin_unlock_irqrestore(&l2_access_lock, flags);54 55 return val;56}57EXPORT_SYMBOL_GPL(kryo_l2_get_indirect_reg);58