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@xxxxxx> --- Changes in v2: * As this is needed only the in the suspend/resume path removed the cpu_pm notifier and added the save/restore in the suspend/resume calls. * Saving/Restoring unconditionally at the moment. This will be optimized later with the help of a pdata-quirk function. drivers/pinctrl/pinctrl-single.c | 72 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c index a7c5eb3..9c3c005 100644 --- 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 int pcs_remove(struct platform_device *pdev) }; 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 */ }; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-gpio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html