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clk: imx: vf610: add suspend/resume support

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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 <stefan@agner.ch>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Stefan Agner 2016-03-09 18:16:50 -08:00 committed by Shawn Guo
parent 349efbeedb
commit 4cfe6aebb2
1 changed files with 48 additions and 0 deletions
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48
drivers/clk/imx/clk-vf610.c
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@ -10,6 +10,7 @@
#include <linux/of_address.h>
#include <linux/clk.h>
#include <linux/syscore_ops.h>
#include <dt-bindings/clock/vf610-clock.h>
#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);