kryo-l2-accessors.c

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 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 register
18 * @reg: Address of L2 register.
19 * @val: Value to be written to register.
20 *
21 * Use architecturally required barriers for ordering between system register
22 * accesses, and system registers with respect to device memory
23 */
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 value
39 * @reg: Address of L2 register.
40 *
41 * Use architecturally required barriers for ordering between system register
42 * accesses, and system registers with respect to device memory
43 */
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);