diff options
| author | Santosh Shilimkar <santosh.shilimkar@ti.com> | 2012-04-12 11:31:52 (GMT) |
|---|---|---|
| committer | Nishanth Menon <nm@ti.com> | 2014-09-08 16:38:41 (GMT) |
| commit | 6d846c46683a4a8a54fbd30b0ff1434a7d898026 (patch) | |
| tree | 14a62fe743a92c4df4ea25d5b1bdbe90cd3e70b1 /arch/arm | |
| parent | 4664d4d86012c4a51b9f40d0d72e27e39205e874 (diff) | |
| download | linux-6d846c46683a4a8a54fbd30b0ff1434a7d898026.tar.xz | |
ARM: OMAP5 / DRA7: PM: Enable Mercury retention mode on CPUx powerdomains
In addition to the standard power-management technique, the OMAP5 / DRA7
MPU subsystem also employs an SR3-APG (mercury) power management
technology to reduce leakage.
It allows for full logic and memories retention on MPU_C0 and MPU_C1 and
is controlled by the PRCM_MPU. Only "Fast-mode" is supported on the
OMAP5 and DRA7 family of processors.
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
[nm@ti.com: minor consolidation]
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Diffstat (limited to 'arch/arm')
| -rw-r--r-- | arch/arm/mach-omap2/omap-mpuss-lowpower.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c index 63a1dd7..fad6e8c 100644 --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c @@ -321,6 +321,21 @@ int omap4_hotplug_cpu(unsigned int cpu, unsigned int power_state) /* + * Enable Mercury Fast HG retention mode by default. + */ +static void enable_mercury_retention_mode(void) +{ + u32 reg; + + reg = omap4_prcm_mpu_read_inst_reg(OMAP54XX_PRCM_MPU_DEVICE_INST, + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET); + /* Enable HG_EN, HG_RAMPUP = fast mode */ + reg |= BIT(24) | BIT(25); + omap4_prcm_mpu_write_inst_reg(reg, OMAP54XX_PRCM_MPU_DEVICE_INST, + OMAP54XX_PRCM_MPU_PRM_PSCON_COUNT_OFFSET); +} + +/* * Initialise OMAP4 MPUSS */ int __init omap4_mpuss_init(void) @@ -397,6 +412,7 @@ int __init omap4_mpuss_init(void) cpu_context_offset = OMAP4_RM_CPU0_CPU0_CONTEXT_OFFSET; } else if (soc_is_omap54xx() || soc_is_dra7xx()) { cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET; + enable_mercury_retention_mode(); } return 0; |