Merge tag 'for-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply

Pull power supply and reset changes from Sebastian Reichel:
 "Core:
   - Nothing

  Drivers:
   - at91-reset: cleanups, proper handling for sam9x60
   - sc27xx, charger-manager: allow building as module
   - sc27xx: add support to read current charge capacity
   - axp288: more quirks for weird hardware
   - misc fixes"

* tag 'for-v5.7' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply: (26 commits)
  power: reset: sc27xx: Allow the SC27XX poweroff driver building into a module
  power: reset: sc27xx: Change to use cpu_down()
  power: reset: sc27xx: Power off the external subsystems' connection
  power: twl4030: Use scnprintf() for avoiding potential buffer overflow
  power: supply: bq27xxx_battery: Silence deferred-probe error
  power: reset: at91-reset: handle nrst async for sam9x60
  power: reset: at91-reset: get rid of at91_reset_data
  power: reset: at91-reset: keep only one reset function
  power: reset: at91-reset: make at91sam9g45_restart() generic
  power: reset: at91-reset: introduce ramc_lpr to struct at91_reset
  power: reset: at91-reset: use r4 as tmp argument
  power: reset: at91-reset: introduce args member in at91_reset_data
  power: reset: at91-reset: introduce struct at91_reset_data
  power: reset: at91-reset: devm_kzalloc() for at91_reset data structure
  power: reset: at91-reset: pass rstc base address to at91_reset_status()
  power: reset: at91-reset: convert reset in pointer to struct at91_reset
  power: reset: at91-reset: add notifier block to struct at91_reset
  power: reset: at91-reset: add sclk to struct at91_reset
  power: reset: at91-reset: add ramc_base[] to struct at91_reset
  power: reset: at91-reset: introduce struct at91_reset
  ...

1 files changed, 94 insertions, 96 deletions

diff --git a/drivers/power/reset/at91-reset.c b/drivers/power/reset/at91-reset.c
index d94e3267c3b6..3ff9d93a5226 100644
--- a/drivers/power/reset/at91-reset.c
+++ b/drivers/power/reset/at91-reset.c
@@ -35,6 +35,7 @@
 
 #define AT91_RSTC_MR	0x08		/* Reset Controller Mode Register */
 #define AT91_RSTC_URSTEN	BIT(0)		/* User Reset Enable */
+#define AT91_RSTC_URSTASYNC	BIT(2)		/* User Reset Asynchronous Control */
 #define AT91_RSTC_URSTIEN	BIT(4)		/* User Reset Interrupt Enable */
 #define AT91_RSTC_ERSTL		GENMASK(11, 8)	/* External Reset Length */
 
@@ -49,105 +50,63 @@ enum reset_type {
 	RESET_TYPE_ULP2		= 8,
 };
 
-static void __iomem *at91_ramc_base[2], *at91_rstc_base;
-static struct clk *sclk;
+struct at91_reset {
+	void __iomem *rstc_base;
+	void __iomem *ramc_base[2];
+	struct clk *sclk;
+	struct notifier_block nb;
+	u32 args;
+	u32 ramc_lpr;
+};
 
 /*
 * unless the SDRAM is cleanly shutdown before we hit the
 * reset register it can be left driving the data bus and
 * killing the chance of a subsequent boot from NAND
 */
-static int at91sam9260_restart(struct notifier_block *this, unsigned long mode,
-			       void *cmd)
+static int at91_reset(struct notifier_block *this, unsigned long mode,
+		      void *cmd)
 {
-	asm volatile(
-		/* Align to cache lines */
-		".balign 32\n\t"
-
-		/* Disable SDRAM accesses */
-		"str	%2, [%0, #" __stringify(AT91_SDRAMC_TR) "]\n\t"
-
-		/* Power down SDRAM */
-		"str	%3, [%0, #" __stringify(AT91_SDRAMC_LPR) "]\n\t"
-
-		/* Reset CPU */
-		"str	%4, [%1, #" __stringify(AT91_RSTC_CR) "]\n\t"
-
-		"b	.\n\t"
-		:
-		: "r" (at91_ramc_base[0]),
-		  "r" (at91_rstc_base),
-		  "r" (1),
-		  "r" cpu_to_le32(AT91_SDRAMC_LPCB_POWER_DOWN),
-		  "r" cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST));
+	struct at91_reset *reset = container_of(this, struct at91_reset, nb);
 
-	return NOTIFY_DONE;
-}
-
-static int at91sam9g45_restart(struct notifier_block *this, unsigned long mode,
-			       void *cmd)
-{
 	asm volatile(
-		/*
-		 * Test wether we have a second RAM controller to care
-		 * about.
-		 *
-		 * First, test that we can dereference the virtual address.
-		 */
-		"cmp	%1, #0\n\t"
-		"beq	1f\n\t"
-
-		/* Then, test that the RAM controller is enabled */
-		"ldr	r0, [%1]\n\t"
-		"cmp	r0, #0\n\t"
-
 		/* Align to cache lines */
 		".balign 32\n\t"
 
 		/* Disable SDRAM0 accesses */
-		"1:	str	%3, [%0, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t"
+		"	tst	%0, #0\n\t"
+		"	beq	1f\n\t"
+		"	str	%3, [%0, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t"
 		/* Power down SDRAM0 */
-		"	str	%4, [%0, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
+		"	str	%4, [%0, %6]\n\t"
 		/* Disable SDRAM1 accesses */
+		"1:	tst	%1, #0\n\t"
+		"	beq	2f\n\t"
 		"	strne	%3, [%1, #" __stringify(AT91_DDRSDRC_RTR) "]\n\t"
 		/* Power down SDRAM1 */
-		"	strne	%4, [%1, #" __stringify(AT91_DDRSDRC_LPR) "]\n\t"
+		"	strne	%4, [%1, %6]\n\t"
 		/* Reset CPU */
-		"	str	%5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t"
+		"2:	str	%5, [%2, #" __stringify(AT91_RSTC_CR) "]\n\t"
 
 		"	b	.\n\t"
 		:
-		: "r" (at91_ramc_base[0]),
-		  "r" (at91_ramc_base[1]),
-		  "r" (at91_rstc_base),
+		: "r" (reset->ramc_base[0]),
+		  "r" (reset->ramc_base[1]),
+		  "r" (reset->rstc_base),
 		  "r" (1),
 		  "r" cpu_to_le32(AT91_DDRSDRC_LPCB_POWER_DOWN),
-		  "r" cpu_to_le32(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST)
-		: "r0");
-
-	return NOTIFY_DONE;
-}
-
-static int sama5d3_restart(struct notifier_block *this, unsigned long mode,
-			   void *cmd)
-{
-	writel(AT91_RSTC_KEY | AT91_RSTC_PERRST | AT91_RSTC_PROCRST,
-	       at91_rstc_base);
+		  "r" (reset->args),
+		  "r" (reset->ramc_lpr)
+		: "r4");
 
 	return NOTIFY_DONE;
 }
 
-static int samx7_restart(struct notifier_block *this, unsigned long mode,
-			 void *cmd)
-{
-	writel(AT91_RSTC_KEY | AT91_RSTC_PROCRST, at91_rstc_base);
-	return NOTIFY_DONE;
-}
-
-static void __init at91_reset_status(struct platform_device *pdev)
+static void __init at91_reset_status(struct platform_device *pdev,
+				     void __iomem *base)
 {
 	const char *reason;
-	u32 reg = readl(at91_rstc_base + AT91_RSTC_SR);
+	u32 reg = readl(base + AT91_RSTC_SR);
 
 	switch ((reg & AT91_RSTC_RSTTYP) >> 8) {
 	case RESET_TYPE_GENERAL:
@@ -183,42 +142,68 @@ static void __init at91_reset_status(struct platform_device *pdev)
 }
 
 static const struct of_device_id at91_ramc_of_match[] = {
-	{ .compatible = "atmel,at91sam9260-sdramc", },
-	{ .compatible = "atmel,at91sam9g45-ddramc", },
+	{
+		.compatible = "atmel,at91sam9260-sdramc",
+		.data = (void *)AT91_SDRAMC_LPR,
+	},
+	{
+		.compatible = "atmel,at91sam9g45-ddramc",
+		.data = (void *)AT91_DDRSDRC_LPR,
+	},
 	{ /* sentinel */ }
 };
 
 static const struct of_device_id at91_reset_of_match[] = {
-	{ .compatible = "atmel,at91sam9260-rstc", .data = at91sam9260_restart },
-	{ .compatible = "atmel,at91sam9g45-rstc", .data = at91sam9g45_restart },
-	{ .compatible = "atmel,sama5d3-rstc", .data = sama5d3_restart },
-	{ .compatible = "atmel,samx7-rstc", .data = samx7_restart },
-	{ .compatible = "microchip,sam9x60-rstc", .data = samx7_restart },
+	{
+		.compatible = "atmel,at91sam9260-rstc",
+		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
+				 AT91_RSTC_PROCRST),
+	},
+	{
+		.compatible = "atmel,at91sam9g45-rstc",
+		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
+				 AT91_RSTC_PROCRST)
+	},
+	{
+		.compatible = "atmel,sama5d3-rstc",
+		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PERRST |
+				 AT91_RSTC_PROCRST)
+	},
+	{
+		.compatible = "atmel,samx7-rstc",
+		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PROCRST)
+	},
+	{
+		.compatible = "microchip,sam9x60-rstc",
+		.data = (void *)(AT91_RSTC_KEY | AT91_RSTC_PROCRST)
+	},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, at91_reset_of_match);
 
-static struct notifier_block at91_restart_nb = {
-	.priority = 192,
-};
-
 static int __init at91_reset_probe(struct platform_device *pdev)
 {
 	const struct of_device_id *match;
+	struct at91_reset *reset;
 	struct device_node *np;
 	int ret, idx = 0;
 
-	at91_rstc_base = of_iomap(pdev->dev.of_node, 0);
-	if (!at91_rstc_base) {
+	reset = devm_kzalloc(&pdev->dev, sizeof(*reset), GFP_KERNEL);
+	if (!reset)
+		return -ENOMEM;
+
+	reset->rstc_base = of_iomap(pdev->dev.of_node, 0);
+	if (!reset->rstc_base) {
 		dev_err(&pdev->dev, "Could not map reset controller address\n");
 		return -ENODEV;
 	}
 
 	if (!of_device_is_compatible(pdev->dev.of_node, "atmel,sama5d3-rstc")) {
 		/* we need to shutdown the ddr controller, so get ramc base */
-		for_each_matching_node(np, at91_ramc_of_match) {
-			at91_ramc_base[idx] = of_iomap(np, 0);
-			if (!at91_ramc_base[idx]) {
+		for_each_matching_node_and_match(np, at91_ramc_of_match, &match) {
+			reset->ramc_lpr = (u32)match->data;
+			reset->ramc_base[idx] = of_iomap(np, 0);
+			if (!reset->ramc_base[idx]) {
 				dev_err(&pdev->dev, "Could not map ram controller address\n");
 				of_node_put(np);
 				return -ENODEV;
@@ -228,33 +213,46 @@ static int __init at91_reset_probe(struct platform_device *pdev)
 	}
 
 	match = of_match_node(at91_reset_of_match, pdev->dev.of_node);
-	at91_restart_nb.notifier_call = match->data;
+	reset->nb.notifier_call = at91_reset;
+	reset->nb.priority = 192;
+	reset->args = (u32)match->data;
 
-	sclk = devm_clk_get(&pdev->dev, NULL);
-	if (IS_ERR(sclk))
-		return PTR_ERR(sclk);
+	reset->sclk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(reset->sclk))
+		return PTR_ERR(reset->sclk);
 
-	ret = clk_prepare_enable(sclk);
+	ret = clk_prepare_enable(reset->sclk);
 	if (ret) {
 		dev_err(&pdev->dev, "Could not enable slow clock\n");
 		return ret;
 	}
 
-	ret = register_restart_handler(&at91_restart_nb);
+	platform_set_drvdata(pdev, reset);
+
+	if (of_device_is_compatible(pdev->dev.of_node, "microchip,sam9x60-rstc")) {
+		u32 val = readl(reset->rstc_base + AT91_RSTC_MR);
+
+		writel(AT91_RSTC_KEY | AT91_RSTC_URSTASYNC | val,
+		       reset->rstc_base + AT91_RSTC_MR);
+	}
+
+	ret = register_restart_handler(&reset->nb);
 	if (ret) {
-		clk_disable_unprepare(sclk);
+		clk_disable_unprepare(reset->sclk);
 		return ret;
 	}
 
-	at91_reset_status(pdev);
+	at91_reset_status(pdev, reset->rstc_base);
 
 	return 0;
 }
 
 static int __exit at91_reset_remove(struct platform_device *pdev)
 {
-	unregister_restart_handler(&at91_restart_nb);
-	clk_disable_unprepare(sclk);
+	struct at91_reset *reset = platform_get_drvdata(pdev);
+
+	unregister_restart_handler(&reset->nb);
+	clk_disable_unprepare(reset->sclk);
 
 	return 0;
 }