From 4cfe6aebb272d7c75a2c21ce5db3a9e10f57901a Mon Sep 17 00:00:00 2001 From: Stefan Agner Date: Wed, 9 Mar 2016 18:16:50 -0800 Subject: clk: imx: vf610: add suspend/resume support The clock register are lost when enterying LPSTOPx, hence provide suspend/resume functions restoring them. The clock gates get restored by the individual driver, hence we do not need to restore them here. Signed-off-by: Stefan Agner Signed-off-by: Shawn Guo --- drivers/clk/imx/clk-vf610.c | 48 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) (limited to 'drivers/clk') diff --git a/drivers/clk/imx/clk-vf610.c b/drivers/clk/imx/clk-vf610.c index 610a72464f1e..66e6faede8e5 100644 --- a/drivers/clk/imx/clk-vf610.c +++ b/drivers/clk/imx/clk-vf610.c @@ -10,6 +10,7 @@ #include #include +#include #include #include "clk.h" @@ -40,6 +41,7 @@ #define CCM_CCGR9 (ccm_base + 0x64) #define CCM_CCGR10 (ccm_base + 0x68) #define CCM_CCGR11 (ccm_base + 0x6c) +#define CCM_CCGRx(x) (CCM_CCGR0 + (x) * 4) #define CCM_CMEOR0 (ccm_base + 0x70) #define CCM_CMEOR1 (ccm_base + 0x74) #define CCM_CMEOR2 (ccm_base + 0x78) @@ -115,6 +117,13 @@ static struct clk_div_table pll4_audio_div_table[] = { static struct clk *clk[VF610_CLK_END]; static struct clk_onecell_data clk_data; +static u32 cscmr1; +static u32 cscmr2; +static u32 cscdr1; +static u32 cscdr2; +static u32 cscdr3; +static u32 ccgr[12]; + static unsigned int const clks_init_on[] __initconst = { VF610_CLK_SYS_BUS, VF610_CLK_DDR_SEL, @@ -134,6 +143,43 @@ static struct clk * __init vf610_get_fixed_clock( return clk; }; +static int vf610_clk_suspend(void) +{ + int i; + + cscmr1 = readl_relaxed(CCM_CSCMR1); + cscmr2 = readl_relaxed(CCM_CSCMR2); + + cscdr1 = readl_relaxed(CCM_CSCDR1); + cscdr2 = readl_relaxed(CCM_CSCDR2); + cscdr3 = readl_relaxed(CCM_CSCDR3); + + for (i = 0; i < 12; i++) + ccgr[i] = readl_relaxed(CCM_CCGRx(i)); + + return 0; +} + +static void vf610_clk_resume(void) +{ + int i; + + writel_relaxed(cscmr1, CCM_CSCMR1); + writel_relaxed(cscmr2, CCM_CSCMR2); + + writel_relaxed(cscdr1, CCM_CSCDR1); + writel_relaxed(cscdr2, CCM_CSCDR2); + writel_relaxed(cscdr3, CCM_CSCDR3); + + for (i = 0; i < 12; i++) + writel_relaxed(ccgr[i], CCM_CCGRx(i)); +} + +static struct syscore_ops vf610_clk_syscore_ops = { + .suspend = vf610_clk_suspend, + .resume = vf610_clk_resume, +}; + static void __init vf610_clocks_init(struct device_node *ccm_node) { struct device_node *np; @@ -414,6 +460,8 @@ static void __init vf610_clocks_init(struct device_node *ccm_node) for (i = 0; i < ARRAY_SIZE(clks_init_on); i++) clk_prepare_enable(clk[clks_init_on[i]]); + register_syscore_ops(&vf610_clk_syscore_ops); + /* Add the clocks to provider list */ clk_data.clks = clk; clk_data.clk_num = ARRAY_SIZE(clk); -- cgit v1.2.3