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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>
This commit is contained in:
Keerthy 2018-05-17 10:10:21 +05:30 committed by Linus Walleij
parent c0136ef651
commit 88a1dbdec6
1 changed files with 71 additions and 1 deletions
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72
drivers/pinctrl/pinctrl-single.c
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@ -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 */
};