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Date: Mon, 11 Apr 2016 17:28:35 +0200
From: Jan Glauber <jglauber@...ium.com>
To: Wolfram Sang <wsa@...-dreams.de>
Cc: linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
David Daney <ddaney@...iumnetworks.com>,
Jan Glauber <jglauber@...ium.com>
Subject: [PATCH v6 04/19] i2c: octeon: Introduce helper functions for register access
Add helper functions for control, data and status register access.
Signed-off-by: Jan Glauber <jglauber@...ium.com>
---
drivers/i2c/busses/i2c-octeon.c | 56 +++++++++++++++++++++++------------------
1 file changed, 31 insertions(+), 25 deletions(-)
diff --git a/drivers/i2c/busses/i2c-octeon.c b/drivers/i2c/busses/i2c-octeon.c
index 43498a4..b25c491 100644
--- a/drivers/i2c/busses/i2c-octeon.c
+++ b/drivers/i2c/busses/i2c-octeon.c
@@ -97,6 +97,11 @@ static void octeon_i2c_reg_write(struct octeon_i2c *i2c, u64 eop_reg, u8 data)
} while ((tmp & SW_TWSI_V) != 0);
}
+#define octeon_i2c_ctl_write(i2c, val) \
+ octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, val)
+#define octeon_i2c_data_write(i2c, val) \
+ octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, val)
+
/**
* octeon_i2c_reg_read - read lower bits of an I2C core register
* @i2c: The struct octeon_i2c
@@ -118,6 +123,13 @@ static u8 octeon_i2c_reg_read(struct octeon_i2c *i2c, u64 eop_reg)
return tmp & 0xFF;
}
+#define octeon_i2c_ctl_read(i2c) \
+ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL)
+#define octeon_i2c_data_read(i2c) \
+ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA)
+#define octeon_i2c_stat_read(i2c) \
+ octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT)
+
/**
* octeon_i2c_write_int - write the TWSI_INT register
* @i2c: The struct octeon_i2c
@@ -189,7 +201,7 @@ static irqreturn_t octeon_i2c_isr(int irq, void *dev_id)
static int octeon_i2c_test_iflg(struct octeon_i2c *i2c)
{
- return (octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_CTL) & TWSI_CTL_IFLG) != 0;
+ return (octeon_i2c_ctl_read(i2c) & TWSI_CTL_IFLG) != 0;
}
/**
@@ -262,14 +274,14 @@ static int octeon_i2c_init_lowlevel(struct octeon_i2c *i2c)
int tries;
/* disable high level controller, enable bus access */
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB);
/* reset controller */
octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_RST, 0);
for (tries = 10; tries; tries--) {
udelay(1);
- status = octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT);
+ status = octeon_i2c_stat_read(i2c);
if (status == STAT_IDLE)
return 0;
}
@@ -288,27 +300,25 @@ static int octeon_i2c_start(struct octeon_i2c *i2c)
int result;
u8 data;
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL,
- TWSI_CTL_ENAB | TWSI_CTL_STA);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STA);
result = octeon_i2c_wait(i2c);
if (result) {
- if (octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT) == STAT_IDLE) {
+ if (octeon_i2c_stat_read(i2c) == STAT_IDLE) {
/*
* Controller refused to send start flag May
* be a client is holding SDA low - let's try
* to free it.
*/
octeon_i2c_unblock(i2c);
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL,
- TWSI_CTL_ENAB | TWSI_CTL_STA);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STA);
result = octeon_i2c_wait(i2c);
}
if (result)
return result;
}
- data = octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT);
+ data = octeon_i2c_stat_read(i2c);
if ((data != STAT_START) && (data != STAT_RSTART)) {
dev_err(i2c->dev, "%s: bad status (0x%x)\n", __func__, data);
return -EIO;
@@ -320,8 +330,7 @@ static int octeon_i2c_start(struct octeon_i2c *i2c)
/* send STOP to the bus */
static void octeon_i2c_stop(struct octeon_i2c *i2c)
{
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL,
- TWSI_CTL_ENAB | TWSI_CTL_STP);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_STP);
}
/**
@@ -345,15 +354,15 @@ static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
if (result)
return result;
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, target << 1);
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
+ octeon_i2c_data_write(i2c, target << 1);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB);
result = octeon_i2c_wait(i2c);
if (result)
return result;
for (i = 0; i < length; i++) {
- tmp = octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT);
+ tmp = octeon_i2c_stat_read(i2c);
if ((tmp != STAT_TXADDR_ACK) && (tmp != STAT_TXDATA_ACK)) {
dev_err(i2c->dev,
@@ -362,8 +371,8 @@ static int octeon_i2c_write(struct octeon_i2c *i2c, int target,
return -EIO;
}
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, data[i]);
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
+ octeon_i2c_data_write(i2c, data[i]);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB);
result = octeon_i2c_wait(i2c);
if (result)
@@ -398,16 +407,15 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
if (result)
return result;
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_DATA, (target << 1) | 1);
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL, TWSI_CTL_ENAB);
+ octeon_i2c_data_write(i2c, (target << 1) | 1);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB);
result = octeon_i2c_wait(i2c);
if (result)
return result;
for (i = 0; i < length; i++) {
- tmp = octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_STAT);
-
+ tmp = octeon_i2c_stat_read(i2c);
if ((tmp != STAT_RXDATA_ACK) && (tmp != STAT_RXADDR_ACK)) {
dev_err(i2c->dev,
"%s: bad status before read (0x%x)\n",
@@ -416,17 +424,15 @@ static int octeon_i2c_read(struct octeon_i2c *i2c, int target,
}
if (i + 1 < length)
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL,
- TWSI_CTL_ENAB | TWSI_CTL_AAK);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB | TWSI_CTL_AAK);
else
- octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_CTL,
- TWSI_CTL_ENAB);
+ octeon_i2c_ctl_write(i2c, TWSI_CTL_ENAB);
result = octeon_i2c_wait(i2c);
if (result)
return result;
- data[i] = octeon_i2c_reg_read(i2c, SW_TWSI_EOP_TWSI_DATA);
+ data[i] = octeon_i2c_data_read(i2c);
if (recv_len && i == 0) {
if (data[i] > I2C_SMBUS_BLOCK_MAX + 1) {
dev_err(i2c->dev,
--
1.9.1
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