linux-kernel - [PATCH] i2c: ocores: convert to ioport_map() for IORESOURCE

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Date: Mon,  8 Apr 2024 11:28:36 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Andi Shyti <andi.shyti@...nel.org>,
	Peter Korsgaard <peter@...sgaard.com>,
	Andrew Lunn <andrew@...n.ch>
Cc: Arnd Bergmann <arnd@...db.de>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Wolfram Sang <wsa+renesas@...g-engineering.com>,
	Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Niklas Schnelle <schnelle@...ux.ibm.com>,
	Samuel Holland <samuel.holland@...ive.com>,
	Gregor Herburger <gregor.herburger@...group.com>,
	linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] i2c: ocores: convert to ioport_map() for IORESOURCE_IO

From: Arnd Bergmann <arnd@...db.de>

There is at least one machine that uses this driver but does not
have support for inb()/outb() instructions.

Convert this to using ioport_map() so it can build on architectures
that don't provide these but work correctly on machines that require
using port I/O.

Fixes: 53f44c1005ba ("i2c: add HAS_IOPORT dependencies")
Reported-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Link: https://lore.kernel.org/lkml/CAMuHMdVUQ2WgtpYPYfO2T=itMmZ7w=geREqDtsP8Q3ODh9rxdw@mail.gmail.com/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/i2c/busses/Kconfig      |  1 -
 drivers/i2c/busses/i2c-ocores.c | 21 +++++++--------------
 2 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 2d5e74ac9ea0..64c985ec0fae 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -886,7 +886,6 @@ config I2C_NPCM
 
 config I2C_OCORES
 	tristate "OpenCores I2C Controller"
-	depends on HAS_IOPORT
 	help
 	  If you say yes to this option, support will be included for the
 	  OpenCores I2C controller. For details see
diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index e106af83cef4..56a4dabf5a38 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -32,7 +32,6 @@
  */
 struct ocores_i2c {
 	void __iomem *base;
-	int iobase;
 	u32 reg_shift;
 	u32 reg_io_width;
 	unsigned long flags;
@@ -136,16 +135,6 @@ static inline u8 oc_getreg_32be(struct ocores_i2c *i2c, int reg)
 	return ioread32be(i2c->base + (reg << i2c->reg_shift));
 }
 
-static void oc_setreg_io_8(struct ocores_i2c *i2c, int reg, u8 value)
-{
-	outb(value, i2c->iobase + reg);
-}
-
-static inline u8 oc_getreg_io_8(struct ocores_i2c *i2c, int reg)
-{
-	return inb(i2c->iobase + reg);
-}
-
 static inline void oc_setreg(struct ocores_i2c *i2c, int reg, u8 value)
 {
 	i2c->setreg(i2c, reg, value);
@@ -618,15 +607,19 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 		res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 		if (!res)
 			return -EINVAL;
-		i2c->iobase = res->start;
 		if (!devm_request_region(&pdev->dev, res->start,
 					 resource_size(res),
 					 pdev->name)) {
 			dev_err(&pdev->dev, "Can't get I/O resource.\n");
 			return -EBUSY;
 		}
-		i2c->setreg = oc_setreg_io_8;
-		i2c->getreg = oc_getreg_io_8;
+		i2c->base = devm_ioport_map(&pdev->dev, res->start,
+					    resource_size(res));
+		if (!i2c->base) {
+			dev_err(&pdev->dev, "Can't map I/O resource.\n");
+			return -EBUSY;
+		}
+		i2c->reg_io_width = 1;
 	}
 
 	pdata = dev_get_platdata(&pdev->dev);
-- 
2.39.2