linux-kernel - [PATCH 2/7] MIPS: Embed syscore

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Message-ID: <20250217163713.211949-3-thierry.reding@gmail.com>
Date: Mon, 17 Feb 2025 17:37:08 +0100
From: Thierry Reding <thierry.reding@...il.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: x86@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-riscv@...ts.infradead.org,
	linux-mips@...r.kernel.org,
	loongarch@...ts.linux.dev,
	linuxppc-dev@...ts.ozlabs.org,
	linux-sh@...r.kernel.org,
	linux-pci@...r.kernel.org,
	linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/7] MIPS: Embed syscore_ops in PCI context

From: Thierry Reding <treding@...dia.com>

This enables the syscore callbacks to obtain the PCI context without
relying on a separate global variable.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 arch/mips/pci/pci-alchemy.c | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/arch/mips/pci/pci-alchemy.c b/arch/mips/pci/pci-alchemy.c
index a20de7160b6b..02f0616518e1 100644
--- a/arch/mips/pci/pci-alchemy.c
+++ b/arch/mips/pci/pci-alchemy.c
@@ -33,6 +33,7 @@
 
 struct alchemy_pci_context {
 	struct pci_controller alchemy_pci_ctrl; /* leave as first member! */
+	struct syscore_ops pmops;
 	void __iomem *regs;			/* ctrl base */
 	/* tools for wired entry for config space access */
 	unsigned long last_elo0;
@@ -46,6 +47,12 @@ struct alchemy_pci_context {
 	int (*board_pci_idsel)(unsigned int devsel, int assert);
 };
 
+static inline struct alchemy_pci_context *
+syscore_to_pci_context(struct syscore_ops *ops)
+{
+	return container_of(ops, struct alchemy_pci_context, pmops);
+}
+
 /* for syscore_ops. There's only one PCI controller on Alchemy chips, so this
  * should suffice for now.
  */
@@ -306,9 +313,7 @@ static int alchemy_pci_def_idsel(unsigned int devsel, int assert)
 /* save PCI controller register contents. */
 static int alchemy_pci_suspend(struct syscore_ops *ops)
 {
-	struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
-	if (!ctx)
-		return 0;
+	struct alchemy_pci_context *ctx = syscore_to_pci_context(ops);
 
 	ctx->pm[0]  = __raw_readl(ctx->regs + PCI_REG_CMEM);
 	ctx->pm[1]  = __raw_readl(ctx->regs + PCI_REG_CONFIG) & 0x0009ffff;
@@ -328,9 +333,7 @@ static int alchemy_pci_suspend(struct syscore_ops *ops)
 
 static void alchemy_pci_resume(struct syscore_ops *ops)
 {
-	struct alchemy_pci_context *ctx = __alchemy_pci_ctx;
-	if (!ctx)
-		return;
+	struct alchemy_pci_context *ctx = syscore_to_pci_context(ops);
 
 	__raw_writel(ctx->pm[0],  ctx->regs + PCI_REG_CMEM);
 	__raw_writel(ctx->pm[2],  ctx->regs + PCI_REG_B2BMASK_CCH);
@@ -354,11 +357,6 @@ static void alchemy_pci_resume(struct syscore_ops *ops)
 	alchemy_pci_wired_entry(ctx);	/* install it */
 }
 
-static struct syscore_ops alchemy_pci_pmops = {
-	.suspend	= alchemy_pci_suspend,
-	.resume		= alchemy_pci_resume,
-};
-
 static int alchemy_pci_probe(struct platform_device *pdev)
 {
 	struct alchemy_pci_platdata *pd = pdev->dev.platform_data;
@@ -478,7 +476,9 @@ static int alchemy_pci_probe(struct platform_device *pdev)
 
 	__alchemy_pci_ctx = ctx;
 	platform_set_drvdata(pdev, ctx);
-	register_syscore_ops(&alchemy_pci_pmops);
+	ctx->pmops.suspend = alchemy_pci_suspend;
+	ctx->pmops.resume = alchemy_pci_resume;
+	register_syscore_ops(&ctx->pmops);
 	register_pci_controller(&ctx->alchemy_pci_ctrl);
 
 	dev_info(&pdev->dev, "PCI controller at %ld MHz\n",
-- 
2.48.1