Patchwork [U-Boot,V3,04/11] I2C: mxc_i2c: get rid of __REG access

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Submitter Stefano Babic
Date Jan. 20, 2011, 5:50 p.m.
Message ID <1295545844-12540-1-git-send-email-sbabic@denx.de>
Download mbox | patch
Permalink /patch/79738/
State Accepted
Commit 1d549ade61078b50e68ff867fe59401bb5c2db9b
Delegated to: Stefano Babic
Headers show

Comments

Stefano Babic - Jan. 20, 2011, 5:50 p.m.
This driver accesses to processor's register
via __REG macros, that are removed (or are planned
to be removed) and replaced by C structures.
This patches replaces all occurrencies of __REG macros.

Signed-off-by: Stefano Babic <sbabic@denx.de>
CC: Heiko Schocher <hs@denx.de>
---

Changes:
	- fix code styling issues
	- replace __FUNCTION__ with __func__

 drivers/i2c/mxc_i2c.c |   72 ++++++++++++++++++++++++++++++-------------------
 1 files changed, 44 insertions(+), 28 deletions(-)
Heiko Schocher - Jan. 21, 2011, 6:30 a.m.
Hello Stefano,

Stefano Babic wrote:
> This driver accesses to processor's register
> via __REG macros, that are removed (or are planned
> to be removed) and replaced by C structures.
> This patches replaces all occurrencies of __REG macros.
> 
> Signed-off-by: Stefano Babic <sbabic@denx.de>
> CC: Heiko Schocher <hs@denx.de>
> ---
> 
> Changes:
> 	- fix code styling issues
> 	- replace __FUNCTION__ with __func__
> 
>  drivers/i2c/mxc_i2c.c |   72 ++++++++++++++++++++++++++++++-------------------
>  1 files changed, 44 insertions(+), 28 deletions(-)

Acked-by: Heiko Schocher <hs@denx.de>

bye,
Heiko

Patch

diff --git a/drivers/i2c/mxc_i2c.c b/drivers/i2c/mxc_i2c.c
index 7f669ff..fd6db18 100755
--- a/drivers/i2c/mxc_i2c.c
+++ b/drivers/i2c/mxc_i2c.c
@@ -23,6 +23,7 @@ 
  */
 
 #include <common.h>
+#include <asm/io.h>
 
 #if defined(CONFIG_HARD_I2C)
 
@@ -81,15 +82,26 @@  static u16 div[] = { 30, 32, 36, 42, 48, 52, 60, 72, 80, 88, 104, 128, 144,
 	             160, 192, 240, 288, 320, 384, 480, 576, 640, 768, 960,
 	             1152, 1280, 1536, 1920, 2304, 2560, 3072, 3840};
 
+static inline void i2c_reset(void)
+{
+	writew(0, I2C_BASE + I2CR);	/* Reset module */
+	writew(0, I2C_BASE + I2SR);
+	writew(I2CR_IEN, I2C_BASE + I2CR);
+}
+
 void i2c_init(int speed, int unused)
 {
 	int freq;
 	int i;
 
 #if defined(CONFIG_MX31)
+	struct clock_control_regs *sc_regs =
+		(struct clock_control_regs *)CCM_BASE;
+
 	freq = mx31_get_ipg_clk();
 	/* start the required I2C clock */
-	__REG(CCM_CGR0) = __REG(CCM_CGR0) | (3 << I2C_CLK_OFFSET);
+	writel(readl(&sc_regs->cgr0) | (3 << I2C_CLK_OFFSET),
+		&sc_regs->cgr0);
 #else
 	freq = mxc_get_clock(MXC_IPG_PERCLK);
 #endif
@@ -98,30 +110,28 @@  void i2c_init(int speed, int unused)
 		if (freq / div[i] <= speed)
 			break;
 
-	DPRINTF("%s: speed: %d\n",__FUNCTION__, speed);
+	debug("%s: speed: %d\n", __func__, speed);
 
-	__REG16(I2C_BASE + I2CR) = 0; /* Reset module */
-	__REG16(I2C_BASE + IFDR) = i;
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN;
-	__REG16(I2C_BASE + I2SR) = 0;
+	writew(i, I2C_BASE + IFDR);
+	i2c_reset();
 }
 
 static int wait_busy(void)
 {
 	int timeout = 10000;
 
-	while (!(__REG16(I2C_BASE + I2SR) & I2SR_IIF) && --timeout)
+	while (!(readw(I2C_BASE + I2SR) & I2SR_IIF) && --timeout)
 		udelay(1);
-	__REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
+	writew(0, I2C_BASE + I2SR); /* clear interrupt */
 
 	return timeout;
 }
 
 static int tx_byte(u8 byte)
 {
-	__REG16(I2C_BASE + I2DR) = byte;
+	writew(byte, I2C_BASE + I2DR);
 
-	if (!wait_busy() || __REG16(I2C_BASE + I2SR) & I2SR_RX_NO_AK)
+	if (!wait_busy() || readw(I2C_BASE + I2SR) & I2SR_RX_NO_AK)
 		return -1;
 	return 0;
 }
@@ -131,27 +141,27 @@  static int rx_byte(void)
 	if (!wait_busy())
 		return -1;
 
-	return __REG16(I2C_BASE + I2DR);
+	return readw(I2C_BASE + I2DR);
 }
 
 int i2c_probe(uchar chip)
 {
 	int ret;
 
-	__REG16(I2C_BASE + I2CR) = 0; /* Reset module */
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN;
+	writew(0, I2C_BASE + I2CR); /* Reset module */
+	writew(I2CR_IEN, I2C_BASE + I2CR);
 
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN |  I2CR_MSTA | I2CR_MTX;
+	writew(I2CR_IEN |  I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR);
 	ret = tx_byte(chip << 1);
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN | I2CR_MTX;
+	writew(I2CR_IEN | I2CR_MTX, I2C_BASE + I2CR);
 
 	return ret;
 }
 
 static int i2c_addr(uchar chip, uint addr, int alen)
 {
-	__REG16(I2C_BASE + I2SR) = 0; /* clear interrupt */
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN |  I2CR_MSTA | I2CR_MTX;
+	writew(0, I2C_BASE + I2SR);
+	writew(I2CR_IEN |  I2CR_MSTA | I2CR_MTX, I2C_BASE + I2CR);
 
 	if (tx_byte(chip << 1))
 		return -1;
@@ -167,35 +177,40 @@  int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
 	int timeout = 10000;
 	int ret;
 
-	DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len);
+	debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",
+		__func__, chip, addr, alen, len);
 
 	if (i2c_addr(chip, addr, alen)) {
 		printf("i2c_addr failed\n");
 		return -1;
 	}
 
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN |  I2CR_MSTA | I2CR_MTX | I2CR_RSTA;
+	writew(I2CR_IEN | I2CR_MSTA | I2CR_MTX | I2CR_RSTA, I2C_BASE + I2CR);
 
 	if (tx_byte(chip << 1 | 1))
 		return -1;
 
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN |  I2CR_MSTA | ((len == 1) ? I2CR_TX_NO_AK : 0);
+	writew(I2CR_IEN | I2CR_MSTA |
+		((len == 1) ? I2CR_TX_NO_AK : 0),
+		I2C_BASE + I2CR);
 
-	ret = __REG16(I2C_BASE + I2DR);
+	ret = readw(I2C_BASE + I2DR);
 
 	while (len--) {
 		if ((ret = rx_byte()) < 0)
 			return -1;
 		*buf++ = ret;
 		if (len <= 1)
-			__REG16(I2C_BASE + I2CR) = I2CR_IEN |  I2CR_MSTA | I2CR_TX_NO_AK;
+			writew(I2CR_IEN | I2CR_MSTA |
+				I2CR_TX_NO_AK,
+				I2C_BASE + I2CR);
 	}
 
 	wait_busy();
 
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN;
+	writew(I2CR_IEN, I2C_BASE + I2CR);
 
-	while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
+	while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
 		udelay(1);
 
 	return 0;
@@ -203,8 +218,9 @@  int i2c_read(uchar chip, uint addr, int alen, uchar *buf, int len)
 
 int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
 {
-	int timeout = 10000;
-	DPRINTF("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",__FUNCTION__, chip, addr, alen, len);
+	int timeout = I2C_MAX_TIMEOUT;
+	debug("%s chip: 0x%02x addr: 0x%04x alen: %d len: %d\n",
+		__func__, chip, addr, alen, len);
 
 	if (i2c_addr(chip, addr, alen))
 		return -1;
@@ -213,9 +229,9 @@  int i2c_write(uchar chip, uint addr, int alen, uchar *buf, int len)
 		if (tx_byte(*buf++))
 			return -1;
 
-	__REG16(I2C_BASE + I2CR) = I2CR_IEN;
+	writew(I2CR_IEN, I2C_BASE + I2CR);
 
-	while (__REG16(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
+	while (readw(I2C_BASE + I2SR) & I2SR_IBB && --timeout)
 		udelay(1);
 
 	return 0;