1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun // Copyright (c) 2018, The Linux Foundation. All rights reserved.
3*4882a593Smuzhiyun
4*4882a593Smuzhiyun #include <linux/spinlock.h>
5*4882a593Smuzhiyun #include <linux/export.h>
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <asm/barrier.h>
8*4882a593Smuzhiyun #include <asm/krait-l2-accessors.h>
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun static DEFINE_RAW_SPINLOCK(krait_l2_lock);
11*4882a593Smuzhiyun
krait_set_l2_indirect_reg(u32 addr,u32 val)12*4882a593Smuzhiyun void krait_set_l2_indirect_reg(u32 addr, u32 val)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun unsigned long flags;
15*4882a593Smuzhiyun
16*4882a593Smuzhiyun raw_spin_lock_irqsave(&krait_l2_lock, flags);
17*4882a593Smuzhiyun /*
18*4882a593Smuzhiyun * Select the L2 window by poking l2cpselr, then write to the window
19*4882a593Smuzhiyun * via l2cpdr.
20*4882a593Smuzhiyun */
21*4882a593Smuzhiyun asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr));
22*4882a593Smuzhiyun isb();
23*4882a593Smuzhiyun asm volatile ("mcr p15, 3, %0, c15, c0, 7 @ l2cpdr" : : "r" (val));
24*4882a593Smuzhiyun isb();
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun raw_spin_unlock_irqrestore(&krait_l2_lock, flags);
27*4882a593Smuzhiyun }
28*4882a593Smuzhiyun EXPORT_SYMBOL(krait_set_l2_indirect_reg);
29*4882a593Smuzhiyun
krait_get_l2_indirect_reg(u32 addr)30*4882a593Smuzhiyun u32 krait_get_l2_indirect_reg(u32 addr)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun u32 val;
33*4882a593Smuzhiyun unsigned long flags;
34*4882a593Smuzhiyun
35*4882a593Smuzhiyun raw_spin_lock_irqsave(&krait_l2_lock, flags);
36*4882a593Smuzhiyun /*
37*4882a593Smuzhiyun * Select the L2 window by poking l2cpselr, then read from the window
38*4882a593Smuzhiyun * via l2cpdr.
39*4882a593Smuzhiyun */
40*4882a593Smuzhiyun asm volatile ("mcr p15, 3, %0, c15, c0, 6 @ l2cpselr" : : "r" (addr));
41*4882a593Smuzhiyun isb();
42*4882a593Smuzhiyun asm volatile ("mrc p15, 3, %0, c15, c0, 7 @ l2cpdr" : "=r" (val));
43*4882a593Smuzhiyun
44*4882a593Smuzhiyun raw_spin_unlock_irqrestore(&krait_l2_lock, flags);
45*4882a593Smuzhiyun
46*4882a593Smuzhiyun return val;
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun EXPORT_SYMBOL(krait_get_l2_indirect_reg);
49