HACK (do not mainline): mtd: nand: atmel: Save/restore SMC regs

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[claudiu.beznea@microchip.com: conform with latest version of driver]
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>

Author: Boris Brezillon

drivers/mtd/nand/atmel/nand-controller.c

@@ -2525,11 +2525,35 @@ static int atmel_nand_controller_remove(struct platform_device *pdev)
 	return nc->caps->ops->remove(nc);
 }
 
+static __maybe_unused int atmel_nand_controller_suspend(struct device *dev)
+{
+	struct atmel_nand_controller *nc = dev_get_drvdata(dev);
+	struct atmel_pmecc *pmecc = nc->pmecc;
+
+	if (pmecc && pmecc->regs.timing) {
+		pmecc->suspend.setup = readl(pmecc->regs.timing);
+		pmecc->suspend.pulse = readl(pmecc->regs.timing + 0x4);
+		pmecc->suspend.cycle = readl(pmecc->regs.timing + 0x8);
+		pmecc->suspend.timings = readl(pmecc->regs.timing + 0xc);
+		pmecc->suspend.mode = readl(pmecc->regs.timing + 0x10);
+	}
+
+	return 0;
+}
 static __maybe_unused int atmel_nand_controller_resume(struct device *dev)
 {
 	struct atmel_nand_controller *nc = dev_get_drvdata(dev);
+	struct atmel_pmecc *pmecc = nc->pmecc;
 	struct atmel_nand *nand;
 
+	if (pmecc && pmecc->regs.timing) {
+		writel(pmecc->suspend.setup, pmecc->regs.timing);
+		writel(pmecc->suspend.pulse, pmecc->regs.timing + 0x4);
+		writel(pmecc->suspend.cycle, pmecc->regs.timing + 0x8);
+		writel(pmecc->suspend.timings, pmecc->regs.timing + 0xc);
+		writel(pmecc->suspend.mode, pmecc->regs.timing + 0x10);
+	}
+
 	list_for_each_entry(nand, &nc->chips, node) {
 		int i;
 
@@ -2540,7 +2564,8 @@ static __maybe_unused int atmel_nand_controller_resume(struct device *dev)
 	return 0;
 }
 
-static SIMPLE_DEV_PM_OPS(atmel_nand_controller_pm_ops, NULL,
+static SIMPLE_DEV_PM_OPS(atmel_nand_controller_pm_ops,
+			 atmel_nand_controller_suspend,
 			 atmel_nand_controller_resume);
 
 static struct platform_driver atmel_nand_controller_driver = {

drivers/mtd/nand/atmel/pmecc.c

@@ -148,18 +148,6 @@ struct atmel_pmecc_caps {
 	bool correct_erased_chunks;
 };
 
-struct atmel_pmecc {
-	struct device *dev;
-	const struct atmel_pmecc_caps *caps;
-
-	struct {
-		void __iomem *base;
-		void __iomem *errloc;
-	} regs;
-
-	struct mutex lock;
-};
-
 struct atmel_pmecc_user_conf_cache {
 	u32 cfg;
 	u32 sarea;
@@ -829,7 +817,8 @@ EXPORT_SYMBOL_GPL(atmel_pmecc_wait_rdy);
 
 static struct atmel_pmecc *atmel_pmecc_create(struct platform_device *pdev,
 					const struct atmel_pmecc_caps *caps,
-					int pmecc_res_idx, int errloc_res_idx)
+					int pmecc_res_idx, int errloc_res_idx,
+					int timing_res_idx)
 {
 	struct device *dev = &pdev->dev;
 	struct atmel_pmecc *pmecc;
@@ -853,6 +842,15 @@ static struct atmel_pmecc *atmel_pmecc_create(struct platform_device *pdev,
 	if (IS_ERR(pmecc->regs.errloc))
 		return ERR_CAST(pmecc->regs.errloc);
 
+	res = platform_get_resource(pdev, IORESOURCE_MEM, timing_res_idx);
+	if (!res) {
+		pmecc->regs.timing = NULL;
+	} else {
+		pmecc->regs.timing = devm_ioremap_resource(dev, res);
+		if (IS_ERR(pmecc->regs.timing))
+			return ERR_CAST(pmecc->regs.timing);
+	}
+
 	/* Disable all interrupts before registering the PMECC handler. */
 	writel(0xffffffff, pmecc->regs.base + ATMEL_PMECC_IDR);
 
@@ -960,7 +958,7 @@ struct atmel_pmecc *devm_atmel_pmecc_get(struct device *userdev)
 		if (match && match->data)
 			caps = match->data;
 
-		pmecc = atmel_pmecc_create(pdev, caps, 1, 2);
+		pmecc = atmel_pmecc_create(pdev, caps, 1, 2, 4);
 	}
 
 	return pmecc;
@@ -987,7 +985,7 @@ static int atmel_pmecc_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	pmecc = atmel_pmecc_create(pdev, caps, 0, 1);
+	pmecc = atmel_pmecc_create(pdev, caps, 0, 1, 2);
 	if (IS_ERR(pmecc))
 		return PTR_ERR(pmecc);
 

drivers/mtd/nand/atmel/pmecc.h

@@ -54,6 +54,29 @@ struct atmel_pmecc_user_req {
 	} ecc;
 };
 
+struct atmel_pmecc_suspend_ctx {
+	u32 setup;
+	u32 pulse;
+	u32 cycle;
+	u32 timings;
+	u32 mode;
+};
+
+struct atmel_pmecc {
+	struct device *dev;
+	const struct atmel_pmecc_caps *caps;
+
+	struct {
+		void __iomem *base;
+		void __iomem *errloc;
+		void __iomem *timing;
+	} regs;
+
+	struct mutex lock;
+
+	struct atmel_pmecc_suspend_ctx suspend;
+};
+
 struct atmel_pmecc *devm_atmel_pmecc_get(struct device *dev);
 
 struct atmel_pmecc_user *