clk: mvebu: add suspend/resume for gatable clocks

This commit adds suspend/resume support for the gatable clock driver
used on Marvell EBU platforms. When getting out of suspend, the
Marvell EBU platforms go through the bootloader, which re-enables all
gatable clocks. However, upon resume, the clock framework will not
disable again all gatable clocks that are not used.

Therefore, if the clock driver does not save/restore the state of the
gatable clocks, all gatable clocks that are not claimed by any device
driver will remain enabled after a resume. This is why this driver
saves and restores the state of those clocks.

Since clocks aren't real devices, we don't have the normal ->suspend()
and ->resume() of the device model, and have to use the ->suspend()
and ->resume() hooks of the syscore_ops mechanism. This mechanism has
the unfortunate idea of not providing a way of passing private data,
which requires us to change the driver to make the assumption that
there is only once instance of the gatable clock control structure.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: linux-kernel@vger.kernel.org
Acked-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Link: https://lkml.kernel.org/r/1416585613-2113-9-git-send-email-thomas.petazzoni@free-electrons.com
Signed-off-by: Jason Cooper <jason@lakedaemon.net>

1 files changed, 30 insertions, 2 deletions

diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
index b7fcb469c87a..0d4d1216f2dd 100644
--- a/drivers/clk/mvebu/common.c
+++ b/drivers/clk/mvebu/common.c
@@ -19,6 +19,7 @@
 #include <linux/io.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/syscore_ops.h>
 
 #include "common.h"
 
@@ -177,14 +178,17 @@ struct clk_gating_ctrl {
         spinlock_t *lock;
         struct clk **gates;
         int num_gates;
+        void __iomem *base;
+        u32 saved_reg;
 };
 
 #define to_clk_gate(_hw) container_of(_hw, struct clk_gate, hw)
 
+static struct clk_gating_ctrl *ctrl;
+
 static struct clk *clk_gating_get_src(
         struct of_phandle_args *clkspec, void *data)
 {
-        struct clk_gating_ctrl *ctrl = (struct clk_gating_ctrl *)data;
         int n;
 
         if (clkspec->args_count < 1)
@@ -199,15 +203,35 @@ static struct clk *clk_gating_get_src(
         return ERR_PTR(-ENODEV);
 }
 
+static int mvebu_clk_gating_suspend(void)
+{
+        ctrl->saved_reg = readl(ctrl->base);
+        return 0;
+}
+
+static void mvebu_clk_gating_resume(void)
+{
+        writel(ctrl->saved_reg, ctrl->base);
+}
+
+static struct syscore_ops clk_gate_syscore_ops = {
+        .suspend = mvebu_clk_gating_suspend,
+        .resume = mvebu_clk_gating_resume,
+};
+
 void __init mvebu_clk_gating_setup(struct device_node *np,
                                    const struct clk_gating_soc_desc *desc)
 {
-        struct clk_gating_ctrl *ctrl;
         struct clk *clk;
         void __iomem *base;
         const char *default_parent = NULL;
         int n;
 
+        if (ctrl) {
+                pr_err("mvebu-clk-gating: cannot instantiate more than one gatable clock device\n");
+                return;
+        }
+
         base = of_iomap(np, 0);
         if (WARN_ON(!base))
                 return;
@@ -225,6 +249,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
         /* lock must already be initialized */
         ctrl->lock = &ctrl_gating_lock;
 
+        ctrl->base = base;
+
         /* Count, allocate, and register clock gates */
         for (n = 0; desc[n].name;)
                 n++;
@@ -246,6 +272,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 
         of_clk_add_provider(np, clk_gating_get_src, ctrl);
 
+        register_syscore_ops(&clk_gate_syscore_ops);
+
         return;
 gates_out:
         kfree(ctrl);