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 
14 static 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  */
24 void 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 }
35 EXPORT_SYMBOL(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  */
44 u64 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 }
57 EXPORT_SYMBOL(kryo_l2_get_indirect_reg);
58