pinctrl: pinctrl-single: Add functions to save and restore pinctrl context

This adds a pair of context save/restore functions to save/restore the
state of a set of pinctrl registers. The context is lost during rtc only
suspend with ddr in self-refresh on am43xx. Currently the save/restore
is being done unconditionally. This will be optimized later with a
pdata-quirk function which will allow is to save/restore only when doing
the rtc only mode with ddr in self refresh.

Signed-off-by: Keerthy <j-keerthy@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index a7c5eb3..9c3c005 100644 (file)
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -144,6 +144,7 @@ struct pcs_soc_data {
  * struct pcs_device - pinctrl device instance
  * @res:       resources
  * @base:      virtual address of the controller
+ * @saved_vals: saved values for the controller
  * @size:      size of the ioremapped area
  * @dev:       device entry
  * @np:                device tree node
@@ -172,11 +173,13 @@ struct pcs_soc_data {
 struct pcs_device {
        struct resource *res;
        void __iomem *base;
+       void *saved_vals;
        unsigned size;
        struct device *dev;
        struct device_node *np;
        struct pinctrl_dev *pctl;
        unsigned flags;
+#define PCS_CONTEXT_LOSS_OFF   (1 << 3)
 #define PCS_QUIRK_SHARED_IRQ   (1 << 2)
 #define PCS_FEAT_IRQ           (1 << 1)
 #define PCS_FEAT_PINCONF       (1 << 0)
@@ -1576,6 +1579,67 @@ static int pcs_irq_init_chained_handler(struct pcs_device *pcs,
 }
 
 #ifdef CONFIG_PM
+static int pcs_save_context(struct pcs_device *pcs)
+{
+       int i, mux_bytes;
+       u64 *regsl;
+       u32 *regsw;
+       u16 *regshw;
+
+       mux_bytes = pcs->width / BITS_PER_BYTE;
+
+       if (!pcs->saved_vals)
+               pcs->saved_vals = devm_kzalloc(pcs->dev, pcs->size, GFP_ATOMIC);
+
+       switch (pcs->width) {
+       case 64:
+               regsl = (u64 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       regsl[i] = pcs->read(pcs->base + i * mux_bytes);
+               break;
+       case 32:
+               regsw = (u32 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       regsw[i] = pcs->read(pcs->base + i * mux_bytes);
+               break;
+       case 16:
+               regshw = (u16 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       regshw[i] = pcs->read(pcs->base + i * mux_bytes);
+               break;
+       }
+
+       return 0;
+}
+
+static void pcs_restore_context(struct pcs_device *pcs)
+{
+       int i, mux_bytes;
+       u64 *regsl;
+       u32 *regsw;
+       u16 *regshw;
+
+       mux_bytes = pcs->width / BITS_PER_BYTE;
+
+       switch (pcs->width) {
+       case 64:
+               regsl = (u64 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       pcs->write(regsl[i], pcs->base + i * mux_bytes);
+               break;
+       case 32:
+               regsw = (u32 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       pcs->write(regsw[i], pcs->base + i * mux_bytes);
+               break;
+       case 16:
+               regshw = (u16 *)pcs->saved_vals;
+               for (i = 0; i < pcs->size / mux_bytes; i++)
+                       pcs->write(regshw[i], pcs->base + i * mux_bytes);
+               break;
+       }
+}
+
 static int pinctrl_single_suspend(struct platform_device *pdev,
                                        pm_message_t state)
 {
@@ -1585,6 +1649,9 @@ static int pinctrl_single_suspend(struct platform_device *pdev,
        if (!pcs)
                return -EINVAL;
 
+       if (pcs->flags & PCS_CONTEXT_LOSS_OFF)
+               pcs_save_context(pcs);
+
        return pinctrl_force_sleep(pcs->pctl);
 }
 
@@ -1596,6 +1663,9 @@ static int pinctrl_single_resume(struct platform_device *pdev)
        if (!pcs)
                return -EINVAL;
 
+       if (pcs->flags & PCS_CONTEXT_LOSS_OFF)
+               pcs_restore_context(pcs);
+
        return pinctrl_force_default(pcs->pctl);
 }
 #endif
@@ -1824,7 +1894,7 @@ static const struct pcs_soc_data pinctrl_single_dra7 = {
 };
 
 static const struct pcs_soc_data pinctrl_single_am437x = {
-       .flags = PCS_QUIRK_SHARED_IRQ,
+       .flags = PCS_QUIRK_SHARED_IRQ | PCS_CONTEXT_LOSS_OFF,
        .irq_enable_mask = (1 << 29),   /* OMAP_WAKEUP_EN */
        .irq_status_mask = (1 << 30),   /* OMAP_WAKEUP_EVENT */
 };