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From: nm@ti.com (Nishanth Menon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 06/15] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains
Date: Fri, 1 Mar 2013 13:42:16 -0600	[thread overview]
Message-ID: <20130301194216.GB22626@kahuna> (raw)
In-Reply-To: <1362139864-9233-7-git-send-email-santosh.shilimkar@ti.com>

On 17:40-20130301, Santosh Shilimkar wrote:
> In addition to the standard power-management technique, the OMAP5
> MPU subsystem also employs an SR3-APG (mercury) power management
> technology to reduce leakage.
Mercury fast is employed here - might be good to note that.
> 
> It allows for full logic and memories retention on MPU_C0 and MPU_C1 and
> is controlled by the PRCM_MPU.
> 
> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
> ---
>  arch/arm/mach-omap2/omap-mpuss-lowpower.c |   17 +++++++++++++++++
>  1 file changed, 17 insertions(+)
> 
> diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> index bcd2efb..9fda96b 100644
> --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c
> @@ -360,6 +360,20 @@ int __cpuinit 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);
> +	reg |= BIT(24) | BIT(25);
Can we please use macros here?
we are setting BIT(25) - fast ramp-up (Mercury fast) Vs 0 (which would
have been mercury slow)
BIT(24) is mercury enable basically. OMAP4 prm-regbits-44xx.h did not
have these ofcourse, so might be a different bit file or so?
> +	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)
> @@ -438,6 +452,9 @@ int __init omap4_mpuss_init(void)
>  		cpu_context_offset = OMAP54XX_RM_CPU0_CPU0_CONTEXT_OFFSET;
>  	}
>  
> +	if (soc_is_omap54xx())
> +		enable_mercury_retention_mode();
> +
>  	return 0;
>  }
>  
> -- 
> 1.7.9.5
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

-- 
Regards,
Nishanth Menon

  reply	other threads:[~2013-03-01 19:42 UTC|newest]

Thread overview: 50+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-03-01 12:10 [PATCH 00/15] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 01/15] ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use Santosh Shilimkar
2013-03-01 13:50   ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 02/15] ARM: OMAP5: PM: Update CPU context register offset Santosh Shilimkar
2013-03-01 17:34   ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 03/15] ARM: OMAP4+: PM: Consolidate and use OMAP4 PM code for OMAP5 Santosh Shilimkar
2013-03-01 17:43   ` Nishanth Menon
2013-03-02  5:43     ` Santosh Shilimkar
2013-03-04 18:21       ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 04/15] ARM: OMAP5: PM: Set MPUSS-EMIF clock-domain static dependency Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 05/15] ARM: OMAP5: PM: Enables ES2 PM mode by default Santosh Shilimkar
2013-03-01 19:37   ` Nishanth Menon
2013-03-02  5:47     ` Santosh Shilimkar
2013-03-04 18:29       ` Nishanth Menon
2013-03-10 18:07         ` Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 06/15] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains Santosh Shilimkar
2013-03-01 19:42   ` Nishanth Menon [this message]
2013-03-02  5:52     ` Santosh Shilimkar
2013-03-04 18:33       ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 07/15] ARM: OMAP5: Add init_late() hook to enable pm initialization Santosh Shilimkar
2013-03-01 20:12   ` Nishanth Menon
2013-03-02  6:00     ` Santosh Shilimkar
2013-03-04 18:35       ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 08/15] ARM: OMAP5: PM: Add CPU power off mode support Santosh Shilimkar
2013-03-01 21:36   ` Nishanth Menon
2013-03-02  6:14     ` Santosh Shilimkar
2013-03-04 18:38       ` Nishanth Menon
2013-03-01 12:10 ` [PATCH 09/15] ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force wakeup method Santosh Shilimkar
2013-03-01 21:53   ` Nishanth Menon
2013-03-02  6:16     ` Santosh Shilimkar
2013-03-01 12:10 ` [PATCH 10/15] ARM: OMAP5: PM: Add MPU Open Switch Retention support Santosh Shilimkar
2013-03-01 22:05   ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 11/15] ARM: OMAP5: PM: Add L2 memory power down support Santosh Shilimkar
2013-03-01 23:43   ` Nishanth Menon
2013-03-02  6:24     ` Santosh Shilimkar
2013-03-04 18:41       ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 12/15] ARM: OMAP4+: CPUidle: Cleanup idle driver for OMAP5 support Santosh Shilimkar
2013-03-01 23:56   ` Nishanth Menon
2013-03-02  6:25     ` Santosh Shilimkar
2013-03-01 12:11 ` [PATCH 13/15] ARM: OMAP4+: CPUidle: Deprecate use of omap4_mpuss_read_prev_context_state() Santosh Shilimkar
2013-03-02  0:03   ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 14/15] ARM: OMAP4+: CPUidle: Add OMAP5 idle driver support Santosh Shilimkar
2013-03-02  0:25   ` Nishanth Menon
2013-03-02  6:47     ` Santosh Shilimkar
2013-03-04 18:48       ` Nishanth Menon
2013-03-01 12:11 ` [PATCH 15/15] ARM: OMAP5: PM: handle device instance for for coldreset Santosh Shilimkar
2013-03-01 13:04   ` Nishanth Menon
2013-03-01 13:09     ` Santosh Shilimkar
2013-03-01 13:13       ` Nishanth Menon
2013-03-01 13:16         ` Santosh Shilimkar

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