linux-kernel - [PATCH 11/20] platform: goldfish: pipe: Replace two code blocks with a function call

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Message-Id: <20180827182315.126345-11-rkir@google.com>
Date:   Mon, 27 Aug 2018 11:23:06 -0700
From:   rkir@...gle.com
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, tkjos@...gle.com,
        Roman Kiryanov <rkir@...gle.com>
Subject: [PATCH 11/20] platform: goldfish: pipe: Replace two code blocks with
 a function call

From: Roman Kiryanov <rkir@...gle.com>

Two function calls look cleaner because the function introduces
takes case of all bit shifting and casting.

Signed-off-by: Roman Kiryanov <rkir@...gle.com>
---
 drivers/platform/goldfish/goldfish_pipe.c | 35 ++++++++++++-----------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index 3d28a9be5722..e3c09ff7867a 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -776,6 +776,14 @@ static struct miscdevice goldfish_pipe_miscdev = {
 	.fops = &goldfish_pipe_fops,
 };
 
+static void write_pa_addr(void *addr, void __iomem *portl, void __iomem *porth)
+{
+	const unsigned long paddr = __pa(addr);
+
+	writel(upper_32_bits(paddr), porth);
+	writel(lower_32_bits(paddr), portl);
+}
+
 static int goldfish_pipe_device_init(struct platform_device *pdev)
 {
 	struct goldfish_pipe_dev *dev = &goldfish_pipe_dev;
@@ -816,22 +824,17 @@ static int goldfish_pipe_device_init(struct platform_device *pdev)
 	}
 
 	/* Send the buffer addresses to the host */
-	{
-		u64 paddr = __pa(&dev->buffers->signalled_pipe_buffers);
-
-		writel((u32)(unsigned long)(paddr >> 32),
-			dev->base + PIPE_REG_SIGNAL_BUFFER_HIGH);
-		writel((u32)(unsigned long)paddr,
-			dev->base + PIPE_REG_SIGNAL_BUFFER);
-		writel((u32)MAX_SIGNALLED_PIPES,
-			dev->base + PIPE_REG_SIGNAL_BUFFER_COUNT);
-
-		paddr = __pa(&dev->buffers->open_command_params);
-		writel((u32)(unsigned long)(paddr >> 32),
-			dev->base + PIPE_REG_OPEN_BUFFER_HIGH);
-		writel((u32)(unsigned long)paddr,
-			dev->base + PIPE_REG_OPEN_BUFFER);
-	}
+	write_pa_addr(&dev->buffers->signalled_pipe_buffers,
+		      dev->base + PIPE_REG_SIGNAL_BUFFER,
+		      dev->base + PIPE_REG_SIGNAL_BUFFER_HIGH);
+
+	writel((u32)MAX_SIGNALLED_PIPES,
+	       dev->base + PIPE_REG_SIGNAL_BUFFER_COUNT);
+
+	write_pa_addr(&dev->buffers->open_command_params,
+		      dev->base + PIPE_REG_OPEN_BUFFER,
+		      dev->base + PIPE_REG_OPEN_BUFFER_HIGH);
+
 	return 0;
 }
 
-- 
2.19.0.rc0.228.g281dcd1b4d0-goog