Author: ian
Date: Wed Jul 26 21:20:57 2017
New Revision: 321586
URL: https://svnweb.freebsd.org/changeset/base/321586
Log:
Add a debug sysctl that lets you see i2c bus traffic through this device.
Modified:
head/sys/arm/freescale/imx/imx_i2c.c
Modified: head/sys/arm/freescale/imx/imx_i2c.c
==============================================================================
--- head/sys/arm/freescale/imx/imx_i2c.c Wed Jul 26 21:09:10 2017
(r321585)
+++ head/sys/arm/freescale/imx/imx_i2c.c Wed Jul 26 21:20:57 2017
(r321586)
@@ -53,6 +53,7 @@ __FBSDID("$FreeBSD$");
#include <sys/limits.h>
#include <sys/module.h>
#include <sys/resource.h>
+#include <sys/sysctl.h>
#include <machine/bus.h>
#include <machine/resource.h>
@@ -138,8 +139,18 @@ struct i2c_softc {
int rb_pinctl_idx;
gpio_pin_t rb_sclpin;
gpio_pin_t rb_sdapin;
+ u_int debug;
+ u_int slave;
};
+#define DEVICE_DEBUGF(sc, lvl, fmt, args...) \
+ if ((lvl) <= (sc)->debug) \
+ device_printf((sc)->dev, fmt, ##args)
+
+#define DEBUGF(sc, lvl, fmt, args...) \
+ if ((lvl) <= (sc)->debug) \
+ printf(fmt, ##args)
+
static phandle_t i2c_get_node(device_t, device_t);
static int i2c_probe(device_t);
static int i2c_attach(device_t);
@@ -383,6 +394,12 @@ i2c_attach(device_t dev)
return (ENXIO);
}
+ /* Set up debug-enable sysctl. */
+ SYSCTL_ADD_INT(device_get_sysctl_ctx(sc->dev),
+ SYSCTL_CHILDREN(device_get_sysctl_tree(sc->dev)),
+ OID_AUTO, "debug", CTLFLAG_RWTUN, &sc->debug, 0,
+ "Enable debug; 1=reads/writes, 2=add starts/stops");
+
/*
* Set up for bus recovery using gpio pins, if the pinctrl and gpio
* properties are present. This is optional. If all the config data is
@@ -450,6 +467,8 @@ i2c_repeated_start(device_t dev, u_char slave, int tim
DELAY(1);
i2c_write_reg(sc, I2C_STATUS_REG, 0x0);
i2c_write_reg(sc, I2C_DATA_REG, slave);
+ sc->slave = slave;
+ DEVICE_DEBUGF(sc, 2, "rstart 0x%02x\n", sc->slave);
error = wait_for_xfer(sc, true);
return (i2c_error_handler(sc, error));
}
@@ -472,6 +491,8 @@ i2c_start_ll(device_t dev, u_char slave, int timeout)
return (i2c_error_handler(sc, error));
i2c_write_reg(sc, I2C_STATUS_REG, 0);
i2c_write_reg(sc, I2C_DATA_REG, slave);
+ sc->slave = slave;
+ DEVICE_DEBUGF(sc, 2, "start 0x%02x\n", sc->slave);
error = wait_for_xfer(sc, true);
return (i2c_error_handler(sc, error));
}
@@ -511,6 +532,7 @@ i2c_stop(device_t dev)
i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN);
wait_for_busbusy(sc, false);
i2c_write_reg(sc, I2C_CONTROL_REG, 0);
+ DEVICE_DEBUGF(sc, 2, "stop 0x%02x\n", sc->slave);
return (IIC_NOERR);
}
@@ -522,6 +544,8 @@ i2c_reset(device_t dev, u_char speed, u_char addr, u_c
sc = device_get_softc(dev);
+ DEVICE_DEBUGF(sc, 1, "reset\n");
+
/*
* Look up the divisor that gives the nearest speed that doesn't exceed
* the configured value for the bus.
@@ -567,6 +591,7 @@ i2c_read(device_t dev, char *buf, int len, int *read,
sc = device_get_softc(dev);
*read = 0;
+ DEVICE_DEBUGF(sc, 1, "read 0x%02x len %d: ", sc->slave, len);
if (len) {
if (len == 1)
i2c_write_reg(sc, I2C_CONTROL_REG, I2CCR_MEN |
@@ -598,9 +623,11 @@ i2c_read(device_t dev, char *buf, int len, int *read,
}
}
reg = i2c_read_reg(sc, I2C_DATA_REG);
+ DEBUGF(sc, 1, "0x%02x ", reg);
*buf++ = reg;
(*read)++;
}
+ DEBUGF(sc, 1, "\n");
return (i2c_error_handler(sc, error));
}
@@ -615,13 +642,15 @@ i2c_write(device_t dev, const char *buf, int len, int
error = 0;
*sent = 0;
+ DEVICE_DEBUGF(sc, 1, "write 0x%02x len %d: ", sc->slave, len);
while (*sent < len) {
+ DEBUGF(sc, 1, "0x%02x ", *buf);
i2c_write_reg(sc, I2C_STATUS_REG, 0x0);
i2c_write_reg(sc, I2C_DATA_REG, *buf++);
if ((error = wait_for_xfer(sc, true)) != IIC_NOERR)
break;
(*sent)++;
}
-
+ DEBUGF(sc, 1, "\n");
return (i2c_error_handler(sc, error));
}
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