diff options
| author | Stephen Boyd <sboyd@codeaurora.org> | 2018-08-14 17:42:20 +0530 |
|---|---|---|
| committer | Stephen Boyd <sboyd@kernel.org> | 2018-10-17 13:14:33 -0700 |
| commit | 36d68f64c411e09788687d5919886aadeb92adca (patch) | |
| tree | 4f7f19217073c5fa8804358c7bbb8d1407b35c0b /arch/arm/include/asm/krait-l2-accessors.h | |
| parent | 5b394b2ddf0347bef56e50c69a58773c94343ff3 (diff) | |
ARM: Add Krait L2 register accessor functions
Krait CPUs have a handful of L2 cache controller registers that
live behind a cp15 based indirection register. First you program
the indirection register (l2cpselr) to point the L2 'window'
register (l2cpdr) at what you want to read/write. Then you
read/write the 'window' register to do what you want. The
l2cpselr register is not banked per-cpu so we must lock around
accesses to it to prevent other CPUs from re-pointing l2cpdr
underneath us.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Russell King <linux@arm.linux.org.uk>
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Tested-by: Craig Tatlor <ctatlor97@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Diffstat (limited to 'arch/arm/include/asm/krait-l2-accessors.h')
| -rw-r--r-- | arch/arm/include/asm/krait-l2-accessors.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/arm/include/asm/krait-l2-accessors.h b/arch/arm/include/asm/krait-l2-accessors.h new file mode 100644 index 000000000000..a5f2cdd6445f --- /dev/null +++ b/arch/arm/include/asm/krait-l2-accessors.h @@ -0,0 +1,9 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef __ASMARM_KRAIT_L2_ACCESSORS_H +#define __ASMARM_KRAIT_L2_ACCESSORS_H + +extern void krait_set_l2_indirect_reg(u32 addr, u32 val); +extern u32 krait_get_l2_indirect_reg(u32 addr); + +#endif |