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MIPS: pm-cps: Support CM3 changes to Coherence Enable Register 

MIPS CM3 changed the management of coherence. Instead of a coherence
control register with a bitmask of coherent domains, CM3 simply has a
coherence enable register with a single bit to enable coherence of the
local core. Support this by clearing and setting this single bit to
disable / enable coherence.

Signed-off-by: Matt Redfearn <matt.redfearn@imgtec.com>
Reviewed-by: Paul Burton <paul.burton@imgtec.com>
Cc: Adam Buchbinder <adam.buchbinder@gmail.com>
Cc: Tony Wu <tung7970@gmail.com>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Nikolay Martynov <mar.kolya@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/14226/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Matt Redfearn 2016-09-07 10:45:18 +01:00 committed by Ralf Baechle
parent 929d4f51e6
commit 7745199723
2 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/mips/include/asm/mips-cm.h
View File

@ -359,6 +359,7 @@ BUILD_CM_Cx_R_(tcid_8_priority, 0x80)
/* GCR_Cx_COHERENCE register fields */
#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_SHF 0
#define CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK (_ULCAST_(0xff) << 0)
#define CM3_GCR_Cx_COHERENCE_COHEN_MSK (_ULCAST_(0x1) << 0)
/* GCR_Cx_CONFIG register fields */
#define CM_GCR_Cx_CONFIG_IOCUTYPE_SHF 10

29
arch/mips/kernel/pm-cps.c
View File

@ -480,18 +480,20 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state)
uasm_i_sync(&p, STYPE_SYNC);
uasm_i_ehb(&p);
/*
* Disable all but self interventions. The load from COHCTL is defined
* by the interAptiv & proAptiv SUMs as ensuring that the operation
* resulting from the preceding store is complete.
*/
uasm_i_addiu(&p, t0, zero, 1 << cpu_data[cpu].core);
uasm_i_sw(&p, t0, 0, r_pcohctl);
uasm_i_lw(&p, t0, 0, r_pcohctl);
if (mips_cm_revision() < CM_REV_CM3) {
/*
* Disable all but self interventions. The load from COHCTL is
* defined by the interAptiv & proAptiv SUMs as ensuring that the
* operation resulting from the preceding store is complete.
*/
uasm_i_addiu(&p, t0, zero, 1 << cpu_data[cpu].core);
uasm_i_sw(&p, t0, 0, r_pcohctl);
uasm_i_lw(&p, t0, 0, r_pcohctl);
/* Barrier to ensure write to coherence control is complete */
uasm_i_sync(&p, STYPE_SYNC);
uasm_i_ehb(&p);
/* Barrier to ensure write to coherence control is complete */
uasm_i_sync(&p, STYPE_SYNC);
uasm_i_ehb(&p);
}
/* Disable coherence */
uasm_i_sw(&p, zero, 0, r_pcohctl);
@ -566,7 +568,10 @@ static void * __init cps_gen_entry_code(unsigned cpu, enum cps_pm_state state)
* will run this. The first will actually re-enable coherence & the
* rest will just be performing a rather unusual nop.
*/
uasm_i_addiu(&p, t0, zero, CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK);
uasm_i_addiu(&p, t0, zero, mips_cm_revision() < CM_REV_CM3
? CM_GCR_Cx_COHERENCE_COHDOMAINEN_MSK
: CM3_GCR_Cx_COHERENCE_COHEN_MSK);
uasm_i_sw(&p, t0, 0, r_pcohctl);
uasm_i_lw(&p, t0, 0, r_pcohctl);