Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4cfe6aeb authored by Stefan Agner's avatar Stefan Agner Committed by Shawn Guo
Browse files

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: default avatarStefan Agner <stefan@agner.ch>
Signed-off-by: default avatarShawn Guo <shawnguo@kernel.org>
parent 349efbee
Loading
Loading
Loading
Loading
+48 −0
Original line number Diff line number Diff line
@@ -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);