[PATCH V6] staging: goldfish: Fix pointer cast for 32 bits

From: Peter Senna Tschudin
Date: Tue May 19 2015 - 05:45:16 EST

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As the first argument of gf_write64() was of type unsigned long, and as
some calls to gf_write64() were casting the first argument from void *
to u64 the compiler and/or sparse were printing warnings for casts of
wrong sizes when compiling for i386.

This patch changes the type of the first argument of gf_write64() to
const void *, and update calls to the function. This change fixed the
warnings and allowed to remove casts from 3 calls to gf_write64().

In addition gf_write64() was renamed to gf_write_ptr() as the name was
misleading because it only writes 32 bits on 32 bit systems.

gf_write_dma_addr() was added to handle dma_addr_t values which is
used at drivers/staging/goldfish/goldfish_audio.c.

Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Peter Senna Tschudin <peter.senna@xxxxxxxxx>
---
When submiting V5, I havent tested the patch properly. It was
my fault. Tested by compilation only for i386 and for x86_64.

Changes from v5:
- Added const to first argument of both gf_write_ptr()
and gf_write_dma_addr()

Changes from V4:
- Added the function gf_write_dma_addr()
- Changed the subject line

Changes from V3:
- Changed type of first argument of gf_write64
- Renamed from gf_write64 to gf_write_ptr
- Updated all calls to gf_write_ptr

Changes from V2:
- Fixed spelling of complains
- Updated commit message

Changes from V1:
- Updated commit message

drivers/platform/goldfish/goldfish_pipe.c | 18 +++++++++---------
drivers/staging/goldfish/goldfish_audio.c | 2 +-
drivers/staging/goldfish/goldfish_nand.c | 2 +-
drivers/tty/goldfish.c | 4 ++--
include/linux/goldfish.h | 19 +++++++++++++++----
5 files changed, 28 insertions(+), 17 deletions(-)

diff --git a/drivers/platform/goldfish/goldfish_pipe.c b/drivers/platform/goldfish/goldfish_pipe.c
index d9a09d9..aad16bc 100644
--- a/drivers/platform/goldfish/goldfish_pipe.c
+++ b/drivers/platform/goldfish/goldfish_pipe.c
@@ -158,8 +158,8 @@ static u32 goldfish_cmd_status(struct goldfish_pipe *pipe, u32 cmd)
struct goldfish_pipe_dev *dev = pipe->dev;

spin_lock_irqsave(&dev->lock, flags);
- gf_write64((u64)(unsigned long)pipe, dev->base + PIPE_REG_CHANNEL,
- dev->base + PIPE_REG_CHANNEL_HIGH);
+ gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL,
+ dev->base + PIPE_REG_CHANNEL_HIGH);
writel(cmd, dev->base + PIPE_REG_COMMAND);
status = readl(dev->base + PIPE_REG_STATUS);
spin_unlock_irqrestore(&dev->lock, flags);
@@ -172,8 +172,8 @@ static void goldfish_cmd(struct goldfish_pipe *pipe, u32 cmd)
struct goldfish_pipe_dev *dev = pipe->dev;

spin_lock_irqsave(&dev->lock, flags);
- gf_write64((u64)(unsigned long)pipe, dev->base + PIPE_REG_CHANNEL,
- dev->base + PIPE_REG_CHANNEL_HIGH);
+ gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL,
+ dev->base + PIPE_REG_CHANNEL_HIGH);
writel(cmd, dev->base + PIPE_REG_COMMAND);
spin_unlock_irqrestore(&dev->lock, flags);
}
@@ -327,12 +327,12 @@ static ssize_t goldfish_pipe_read_write(struct file *filp, char __user *buffer,
spin_lock_irqsave(&dev->lock, irq_flags);
if (access_with_param(dev, CMD_WRITE_BUFFER + cmd_offset,
address, avail, pipe, &status)) {
- gf_write64((u64)(unsigned long)pipe,
- dev->base + PIPE_REG_CHANNEL,
- dev->base + PIPE_REG_CHANNEL_HIGH);
+ gf_write_ptr(pipe, dev->base + PIPE_REG_CHANNEL,
+ dev->base + PIPE_REG_CHANNEL_HIGH);
writel(avail, dev->base + PIPE_REG_SIZE);
- gf_write64(address, dev->base + PIPE_REG_ADDRESS,
- dev->base + PIPE_REG_ADDRESS_HIGH);
+ gf_write_ptr((void *)address,
+ dev->base + PIPE_REG_ADDRESS,
+ dev->base + PIPE_REG_ADDRESS_HIGH);
writel(CMD_WRITE_BUFFER + cmd_offset,
dev->base + PIPE_REG_COMMAND);
status = readl(dev->base + PIPE_REG_STATUS);
diff --git a/drivers/staging/goldfish/goldfish_audio.c b/drivers/staging/goldfish/goldfish_audio.c
index 702ae04..b0927e4 100644
--- a/drivers/staging/goldfish/goldfish_audio.c
+++ b/drivers/staging/goldfish/goldfish_audio.c
@@ -63,7 +63,7 @@ struct goldfish_audio {
#define AUDIO_READ(data, addr) (readl(data->reg_base + addr))
#define AUDIO_WRITE(data, addr, x) (writel(x, data->reg_base + addr))
#define AUDIO_WRITE64(data, addr, addr2, x) \
- (gf_write64((u64)(x), data->reg_base + addr, data->reg_base+addr2))
+ (gf_write_dma_addr((x), data->reg_base + addr, data->reg_base+addr2))

/*
* temporary variable used between goldfish_audio_probe() and
diff --git a/drivers/staging/goldfish/goldfish_nand.c b/drivers/staging/goldfish/goldfish_nand.c
index 213877a..66ae48f 100644
--- a/drivers/staging/goldfish/goldfish_nand.c
+++ b/drivers/staging/goldfish/goldfish_nand.c
@@ -87,7 +87,7 @@ static u32 goldfish_nand_cmd(struct mtd_info *mtd, enum nand_cmd cmd,
writel((u32)(addr >> 32), base + NAND_ADDR_HIGH);
writel((u32)addr, base + NAND_ADDR_LOW);
writel(len, base + NAND_TRANSFER_SIZE);
- gf_write64((u64)ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
+ gf_write_ptr(ptr, base + NAND_DATA, base + NAND_DATA_HIGH);
writel(cmd, base + NAND_COMMAND);
rv = readl(base + NAND_RESULT);
}
diff --git a/drivers/tty/goldfish.c b/drivers/tty/goldfish.c
index 0655fec..0f82c0b 100644
--- a/drivers/tty/goldfish.c
+++ b/drivers/tty/goldfish.c
@@ -59,7 +59,7 @@ static void goldfish_tty_do_write(int line, const char *buf, unsigned count)
struct goldfish_tty *qtty = &goldfish_ttys[line];
void __iomem *base = qtty->base;
spin_lock_irqsave(&qtty->lock, irq_flags);
- gf_write64((u64)buf, base + GOLDFISH_TTY_DATA_PTR,
+ gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
base + GOLDFISH_TTY_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_DATA_LEN);
writel(GOLDFISH_TTY_CMD_WRITE_BUFFER, base + GOLDFISH_TTY_CMD);
@@ -81,7 +81,7 @@ static irqreturn_t goldfish_tty_interrupt(int irq, void *dev_id)

count = tty_prepare_flip_string(&qtty->port, &buf, count);
spin_lock_irqsave(&qtty->lock, irq_flags);
- gf_write64((u64)buf, base + GOLDFISH_TTY_DATA_PTR,
+ gf_write_ptr(buf, base + GOLDFISH_TTY_DATA_PTR,
base + GOLDFISH_TTY_DATA_PTR_HIGH);
writel(count, base + GOLDFISH_TTY_DATA_LEN);
writel(GOLDFISH_TTY_CMD_READ_BUFFER, base + GOLDFISH_TTY_CMD);
diff --git a/include/linux/goldfish.h b/include/linux/goldfish.h
index 569236e..93e080b 100644
--- a/include/linux/goldfish.h
+++ b/include/linux/goldfish.h
@@ -3,13 +3,24 @@

/* Helpers for Goldfish virtual platform */

-static inline void gf_write64(unsigned long data,
- void __iomem *portl, void __iomem *porth)
+static inline void gf_write_ptr(const void *ptr, void __iomem *portl,
+ void __iomem *porth)
{
- writel((u32)data, portl);
+ writel((u32)(unsigned long)ptr, portl);
#ifdef CONFIG_64BIT
- writel(data>>32, porth);
+ writel((unsigned long)ptr >> 32, porth);
#endif
}

+static inline void gf_write_dma_addr(const dma_addr_t addr,
+ void __iomem *portl,
+ void __iomem *porth)
+{
+ writel((u32)addr, portl);
+#ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT
+ writel(addr >> 32, porth);
+#endif
+}
+
+
#endif /* __LINUX_GOLDFISH_H */
--
2.1.0

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Next message: Takashi Iwai: "Re: [RESEND][PATCH] Bluetooth: Make request workqueue freezable"
Previous message: maitysanchayan: "Re: [PATCH v1 2/2] ARM: vf610: Add SoC bus support for Vybrid"
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