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ARM: imx: add cpuidle support for i.mx6sl

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Add cpuidle support for i.MX6SL, currently only support
two cpuidle levels(ARM wfi and WAIT mode), and add software
workaround for WAIT mode errata as below:

ERR005311 CCM: After exit from WAIT mode, unwanted interrupt(s) taken
          during WAIT mode entry process could cause cache memory
          corruption.

Software workaround:
    To prevent this issue from occurring, software should ensure that
the ARM to IPG clock ratio is less than 12:5 (that is < 2.4x), before
entering WAIT mode.

Signed-off-by: Anson Huang <b20788@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Anson Huang
2014-01-09 16:03:16 +08:00
committed by Shawn Guo
parent 848db4a0a1
commit 751f7e999a
6 changed files with 93 additions and 0 deletions
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arch/arm/mach-imx/common.h
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@@ -140,6 +140,7 @@ void imx_anatop_pre_suspend(void);
void imx_anatop_post_resume(void);
int imx6q_set_lpm(enum mxc_cpu_pwr_mode mode);
void imx6q_set_int_mem_clk_lpm(void);
void imx6sl_set_wait_clk(bool enter);
void imx_cpu_die(unsigned int cpu);
int imx_cpu_kill(unsigned int cpu);