git: a138038f6934 - stable/13 - twsi: compile in support for debug messages, disabled by default
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Date: Fri, 03 Dec 2021 07:26:31 UTC
The branch stable/13 has been updated by avg:
URL: https://cgit.FreeBSD.org/src/commit/?id=a138038f69342b30d45d9da056438e7e4e3a1d56
commit a138038f69342b30d45d9da056438e7e4e3a1d56
Author: Andriy Gapon <avg@FreeBSD.org>
AuthorDate: 2021-11-26 06:52:56 +0000
Commit: Andriy Gapon <avg@FreeBSD.org>
CommitDate: 2021-12-03 07:24:22 +0000
twsi: compile in support for debug messages, disabled by default
Debug messages can now be enabled per driver instance via a new sysctl.
Also, debug messages in TWSI_READ and TWSI_WRITE require debug level
greater than 1 as they are mostly redundant because callers of those
functions already log most interesting results.
NB: the twsi drivers call their device iichb, so the new sysctl will
appear under dev.iichb.N.
(cherry picked from commit a2793d6182256b8edf647c11c642ad3c7c83809e)
---
sys/dev/iicbus/twsi/twsi.c | 136 ++++++++++++++++++++++++---------------------
sys/dev/iicbus/twsi/twsi.h | 1 +
2 files changed, 75 insertions(+), 62 deletions(-)
diff --git a/sys/dev/iicbus/twsi/twsi.c b/sys/dev/iicbus/twsi/twsi.c
index 84bf0223fba7..49fe608473b2 100644
--- a/sys/dev/iicbus/twsi/twsi.c
+++ b/sys/dev/iicbus/twsi/twsi.c
@@ -49,6 +49,7 @@ __FBSDID("$FreeBSD$");
#include <sys/module.h>
#include <sys/resource.h>
#include <sys/rman.h>
+#include <sys/sysctl.h>
#include <machine/_inttypes.h>
#include <machine/bus.h>
@@ -85,11 +86,8 @@ __FBSDID("$FreeBSD$");
#define TWSI_DEBUG
#undef TWSI_DEBUG
-#ifdef TWSI_DEBUG
-#define debugf(dev, fmt, args...) device_printf(dev, "%s: " fmt, __func__, ##args)
-#else
-#define debugf(dev, fmt, args...)
-#endif
+#define debugf(sc, fmt, args...) if ((sc)->debug) \
+ device_printf((sc)->dev, "%s: " fmt, __func__, ##args)
static struct resource_spec res_spec[] = {
{ SYS_RES_MEMORY, 0, RF_ACTIVE },
@@ -103,7 +101,8 @@ TWSI_READ(struct twsi_softc *sc, bus_size_t off)
uint32_t val;
val = bus_read_4(sc->res[0], off);
- debugf(sc->dev, "read %x from %lx\n", val, off);
+ if (sc->debug > 1)
+ debugf(sc, "read %x from %lx\n", val, off);
return (val);
}
@@ -111,7 +110,8 @@ static __inline void
TWSI_WRITE(struct twsi_softc *sc, bus_size_t off, uint32_t val)
{
- debugf(sc->dev, "Writing %x to %lx\n", val, off);
+ if (sc->debug > 1)
+ debugf(sc, "Writing %x to %lx\n", val, off);
bus_write_4(sc->res[0], off, val);
}
@@ -121,10 +121,10 @@ twsi_control_clear(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
- debugf(sc->dev, "read val=%x\n", val);
+ debugf(sc, "read val=%x\n", val);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val &= ~mask;
- debugf(sc->dev, "write val=%x\n", val);
+ debugf(sc, "write val=%x\n", val);
TWSI_WRITE(sc, sc->reg_control, val);
}
@@ -134,10 +134,10 @@ twsi_control_set(struct twsi_softc *sc, uint32_t mask)
uint32_t val;
val = TWSI_READ(sc, sc->reg_control);
- debugf(sc->dev, "read val=%x\n", val);
+ debugf(sc, "read val=%x\n", val);
val &= ~(TWSI_CONTROL_STOP | TWSI_CONTROL_START);
val |= mask;
- debugf(sc->dev, "write val=%x\n", val);
+ debugf(sc, "write val=%x\n", val);
TWSI_WRITE(sc, sc->reg_control, val);
}
@@ -166,13 +166,13 @@ twsi_poll_ctrl(struct twsi_softc *sc, int timeout, uint32_t mask)
{
timeout /= 10;
- debugf(sc->dev, "Waiting for ctrl reg to match mask %x\n", mask);
+ debugf(sc, "Waiting for ctrl reg to match mask %x\n", mask);
while (!(TWSI_READ(sc, sc->reg_control) & mask)) {
DELAY(10);
if (--timeout < 0)
return (timeout);
}
- debugf(sc->dev, "done\n");
+ debugf(sc, "done\n");
return (0);
}
@@ -196,11 +196,11 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
/* read IFLG to know if it should be cleared later; from NBSD */
iflg_set = TWSI_READ(sc, sc->reg_control) & TWSI_CONTROL_IFLG;
- debugf(dev, "send start\n");
+ debugf(sc, "send start\n");
twsi_control_set(sc, TWSI_CONTROL_START);
if (mask == TWSI_STATUS_RPTD_START && iflg_set) {
- debugf(dev, "IFLG set, clearing (mask=%x)\n", mask);
+ debugf(sc, "IFLG set, clearing (mask=%x)\n", mask);
twsi_clear_iflg(sc);
}
@@ -211,16 +211,16 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
- debugf(dev, "timeout sending %sSTART condition\n",
+ debugf(sc, "timeout sending %sSTART condition\n",
mask == TWSI_STATUS_START ? "" : "repeated ");
return (IIC_ETIMEOUT);
}
status = TWSI_READ(sc, sc->reg_status);
- debugf(dev, "status=%x\n", status);
+ debugf(sc, "status=%x\n", status);
if (status != mask) {
- debugf(dev, "wrong status (%02x) after sending %sSTART condition\n",
+ debugf(sc, "wrong status (%02x) after sending %sSTART condition\n",
status, mask == TWSI_STATUS_START ? "" : "repeated ");
return (IIC_ESTATUS);
}
@@ -230,7 +230,7 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
- debugf(dev, "timeout sending slave address (timeout=%d)\n", timeout);
+ debugf(sc, "timeout sending slave address (timeout=%d)\n", timeout);
return (IIC_ETIMEOUT);
}
@@ -238,7 +238,7 @@ twsi_locked_start(device_t dev, struct twsi_softc *sc, int32_t mask,
status = TWSI_READ(sc, sc->reg_status);
if (status != (read_access ?
TWSI_STATUS_ADDR_R_ACK : TWSI_STATUS_ADDR_W_ACK)) {
- debugf(dev, "no ACK (status: %02x) after sending slave address\n",
+ debugf(sc, "no ACK (status: %02x) after sending slave address\n",
status);
return (IIC_ENOACK);
}
@@ -264,7 +264,7 @@ twsi_calc_baud_rate(struct twsi_softc *sc, const u_int target,
if (clk_get_freq(sc->clk_core, &clk) < 0)
return (-1);
- debugf(sc->dev, "Bus clock is at %ju\n", clk);
+ debugf(sc, "Bus clock is at %ju\n", clk);
for (n = 0; n < 8; n++) {
for (m = 0; m < 16; m++) {
@@ -306,23 +306,23 @@ twsi_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
case IIC_SLOW:
case IIC_FAST:
param = sc->baud_rate[speed].param;
- debugf(dev, "Using IIC_FAST mode with speed param=%x\n", param);
+ debugf(sc, "Using IIC_FAST mode with speed param=%x\n", param);
break;
case IIC_FASTEST:
case IIC_UNKNOWN:
default:
param = sc->baud_rate[IIC_FAST].param;
- debugf(dev, "Using IIC_FASTEST/UNKNOWN mode with speed param=%x\n", param);
+ debugf(sc, "Using IIC_FASTEST/UNKNOWN mode with speed param=%x\n", param);
break;
}
#ifdef EXT_RESOURCES
}
#endif
- debugf(dev, "Using clock param=%x\n", param);
+ debugf(sc, "Using clock param=%x\n", param);
mtx_lock(&sc->mutex);
- TWSI_WRITE(sc, sc->reg_soft_reset, 0x0);
+ TWSI_WRITE(sc, sc->reg_soft_reset, 0x1);
TWSI_WRITE(sc, sc->reg_baud_rate, param);
TWSI_WRITE(sc, sc->reg_control, TWSI_CONTROL_TWSIEN);
DELAY(1000);
@@ -338,7 +338,7 @@ twsi_stop(device_t dev)
sc = device_get_softc(dev);
- debugf(dev, "%s\n", __func__);
+ debugf(sc, "%s\n", __func__);
mtx_lock(&sc->mutex);
twsi_control_clear(sc, TWSI_CONTROL_ACK);
twsi_control_set(sc, TWSI_CONTROL_STOP);
@@ -360,7 +360,7 @@ twsi_repeated_start(device_t dev, u_char slave, int timeout)
sc = device_get_softc(dev);
- debugf(dev, "%s: slave=%x\n", __func__, slave);
+ debugf(sc, "%s: slave=%x\n", __func__, slave);
mtx_lock(&sc->mutex);
rv = twsi_locked_start(dev, sc, TWSI_STATUS_RPTD_START, slave,
timeout);
@@ -384,7 +384,7 @@ twsi_start(device_t dev, u_char slave, int timeout)
sc = device_get_softc(dev);
- debugf(dev, "%s: slave=%x\n", __func__, slave);
+ debugf(sc, "%s: slave=%x\n", __func__, slave);
mtx_lock(&sc->mutex);
rv = twsi_locked_start(dev, sc, TWSI_STATUS_START, slave, timeout);
mtx_unlock(&sc->mutex);
@@ -422,7 +422,7 @@ twsi_read(device_t dev, char *buf, int len, int *read, int last, int delay)
DELAY(1000);
if (twsi_poll_ctrl(sc, delay, TWSI_CONTROL_IFLG)) {
- debugf(dev, "timeout reading data (delay=%d)\n", delay);
+ debugf(sc, "timeout reading data (delay=%d)\n", delay);
rv = IIC_ETIMEOUT;
goto out;
}
@@ -430,7 +430,7 @@ twsi_read(device_t dev, char *buf, int len, int *read, int last, int delay)
status = TWSI_READ(sc, sc->reg_status);
if (status != (last_byte ?
TWSI_STATUS_DATA_RD_NOACK : TWSI_STATUS_DATA_RD_ACK)) {
- debugf(dev, "wrong status (%02x) while reading\n", status);
+ debugf(sc, "wrong status (%02x) while reading\n", status);
rv = IIC_ESTATUS;
goto out;
}
@@ -461,14 +461,14 @@ twsi_write(device_t dev, const char *buf, int len, int *sent, int timeout)
twsi_clear_iflg(sc);
DELAY(1000);
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
- debugf(dev, "timeout writing data (timeout=%d)\n", timeout);
+ debugf(sc, "timeout writing data (timeout=%d)\n", timeout);
rv = IIC_ETIMEOUT;
goto out;
}
status = TWSI_READ(sc, sc->reg_status);
if (status != TWSI_STATUS_DATA_WR_ACK) {
- debugf(dev, "wrong status (%02x) while writing\n", status);
+ debugf(sc, "wrong status (%02x) while writing\n", status);
rv = IIC_ESTATUS;
goto out;
}
@@ -495,8 +495,8 @@ twsi_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
sc->control_val = TWSI_CONTROL_TWSIEN |
TWSI_CONTROL_INTEN | TWSI_CONTROL_ACK;
TWSI_WRITE(sc, sc->reg_control, sc->control_val);
- debugf(dev, "transmitting %d messages\n", nmsgs);
- debugf(sc->dev, "status=%x\n", TWSI_READ(sc, sc->reg_status));
+ debugf(sc, "transmitting %d messages\n", nmsgs);
+ debugf(sc, "status=%x\n", TWSI_READ(sc, sc->reg_status));
sc->nmsgs = nmsgs;
sc->msgs = msgs;
sc->msg_idx = 0;
@@ -504,7 +504,7 @@ twsi_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
#ifdef TWSI_DEBUG
for (int i = 0; i < nmsgs; i++)
- debugf(sc->dev, "msg %d is %d bytes long\n", i, msgs[i].len);
+ debugf(sc, "msg %d is %d bytes long\n", i, msgs[i].len);
#endif
/* Send start and re-enable interrupts */
sc->control_val = TWSI_CONTROL_TWSIEN |
@@ -515,17 +515,17 @@ twsi_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs)
while (sc->error == 0 && sc->transfer != 0) {
tsleep_sbt(sc, 0, "twsi", SBT_1MS * 30, SBT_1MS, 0);
}
- debugf(sc->dev, "pause finish\n");
+ debugf(sc, "pause finish\n");
if (sc->error) {
- debugf(sc->dev, "Error, aborting (%d)\n", sc->error);
+ debugf(sc, "Error, aborting (%d)\n", sc->error);
TWSI_WRITE(sc, sc->reg_control, 0);
}
/* Disable module and interrupts */
- debugf(sc->dev, "status=%x\n", TWSI_READ(sc, sc->reg_status));
+ debugf(sc, "status=%x\n", TWSI_READ(sc, sc->reg_status));
TWSI_WRITE(sc, sc->reg_control, 0);
- debugf(sc->dev, "status=%x\n", TWSI_READ(sc, sc->reg_status));
+ debugf(sc, "status=%x\n", TWSI_READ(sc, sc->reg_status));
return (sc->error);
}
@@ -539,16 +539,16 @@ twsi_intr(void *arg)
sc = arg;
- debugf(sc->dev, "Got interrupt Current msg=%x\n", sc->msg_idx);
+ debugf(sc, "Got interrupt Current msg=%x\n", sc->msg_idx);
status = TWSI_READ(sc, sc->reg_status);
- debugf(sc->dev, "reg control=%x\n", TWSI_READ(sc, sc->reg_control));
+ debugf(sc, "reg control=%x\n", TWSI_READ(sc, sc->reg_control));
switch (status) {
case TWSI_STATUS_START:
case TWSI_STATUS_RPTD_START:
/* Transmit the address */
- debugf(sc->dev, "Send the address (%x)", sc->msgs[sc->msg_idx].slave);
+ debugf(sc, "Send the address (%x)", sc->msgs[sc->msg_idx].slave);
if (sc->msgs[sc->msg_idx].flags & IIC_M_RD)
TWSI_WRITE(sc, sc->reg_data,
@@ -560,10 +560,10 @@ twsi_intr(void *arg)
break;
case TWSI_STATUS_ADDR_W_ACK:
- debugf(sc->dev, "Ack received after transmitting the address (write)\n");
+ debugf(sc, "Ack received after transmitting the address (write)\n");
/* Directly send the first byte */
sc->sent_bytes = 1;
- debugf(sc->dev, "Sending byte 0 (of %d) = %x\n",
+ debugf(sc, "Sending byte 0 (of %d) = %x\n",
sc->msgs[sc->msg_idx].len,
sc->msgs[sc->msg_idx].buf[0]);
TWSI_WRITE(sc, sc->reg_data, sc->msgs[sc->msg_idx].buf[0]);
@@ -572,7 +572,7 @@ twsi_intr(void *arg)
break;
case TWSI_STATUS_ADDR_R_ACK:
- debugf(sc->dev, "Ack received after transmitting the address (read)\n");
+ debugf(sc, "Ack received after transmitting the address (read)\n");
sc->recv_bytes = 0;
TWSI_WRITE(sc, sc->reg_control, sc->control_val);
@@ -580,7 +580,7 @@ twsi_intr(void *arg)
case TWSI_STATUS_ADDR_W_NACK:
case TWSI_STATUS_ADDR_R_NACK:
- debugf(sc->dev, "No ack received after transmitting the address\n");
+ debugf(sc, "No ack received after transmitting the address\n");
sc->transfer = 0;
sc->error = IIC_ENOACK;
sc->control_val = 0;
@@ -588,29 +588,29 @@ twsi_intr(void *arg)
break;
case TWSI_STATUS_DATA_WR_ACK:
- debugf(sc->dev, "Ack received after transmitting data\n");
+ debugf(sc, "Ack received after transmitting data\n");
if (sc->sent_bytes == sc->msgs[sc->msg_idx].len) {
- debugf(sc->dev, "Done sending all the bytes for msg %d\n", sc->msg_idx);
+ debugf(sc, "Done sending all the bytes for msg %d\n", sc->msg_idx);
/* Send stop, no interrupts on stop */
if (!(sc->msgs[sc->msg_idx].flags & IIC_M_NOSTOP)) {
- debugf(sc->dev, "Done TX data, send stop\n");
+ debugf(sc, "Done TX data, send stop\n");
TWSI_WRITE(sc, sc->reg_control,
sc->control_val | TWSI_CONTROL_STOP);
} else {
- debugf(sc->dev, "Done TX data with NO_STOP\n");
+ debugf(sc, "Done TX data with NO_STOP\n");
TWSI_WRITE(sc, sc->reg_control, sc->control_val | TWSI_CONTROL_START);
}
sc->msg_idx++;
if (sc->msg_idx == sc->nmsgs) {
- debugf(sc->dev, "transfer_done=1\n");
+ debugf(sc, "transfer_done=1\n");
transfer_done = 1;
sc->error = 0;
} else {
- debugf(sc->dev, "Send repeated start\n");
+ debugf(sc, "Send repeated start\n");
TWSI_WRITE(sc, sc->reg_control, sc->control_val | TWSI_CONTROL_START);
}
} else {
- debugf(sc->dev, "Sending byte %d (of %d) = %x\n",
+ debugf(sc, "Sending byte %d (of %d) = %x\n",
sc->sent_bytes,
sc->msgs[sc->msg_idx].len,
sc->msgs[sc->msg_idx].buf[sc->sent_bytes]);
@@ -623,18 +623,18 @@ twsi_intr(void *arg)
break;
case TWSI_STATUS_DATA_RD_ACK:
- debugf(sc->dev, "Ack received after receiving data\n");
+ debugf(sc, "Ack received after receiving data\n");
sc->msgs[sc->msg_idx].buf[sc->recv_bytes++] = TWSI_READ(sc, sc->reg_data);
- debugf(sc->dev, "msg_len=%d recv_bytes=%d\n", sc->msgs[sc->msg_idx].len, sc->recv_bytes);
+ debugf(sc, "msg_len=%d recv_bytes=%d\n", sc->msgs[sc->msg_idx].len, sc->recv_bytes);
/* If we only have one byte left, disable ACK */
if (sc->msgs[sc->msg_idx].len - sc->recv_bytes == 1)
sc->control_val &= ~TWSI_CONTROL_ACK;
if (sc->msgs[sc->msg_idx].len == sc->recv_bytes) {
- debugf(sc->dev, "Done with msg %d\n", sc->msg_idx);
+ debugf(sc, "Done with msg %d\n", sc->msg_idx);
sc->msg_idx++;
if (sc->msg_idx == sc->nmsgs - 1) {
- debugf(sc->dev, "No more msgs\n");
+ debugf(sc, "No more msgs\n");
transfer_done = 1;
sc->error = 0;
}
@@ -645,12 +645,12 @@ twsi_intr(void *arg)
case TWSI_STATUS_DATA_RD_NOACK:
if (sc->msgs[sc->msg_idx].len - sc->recv_bytes == 1) {
sc->msgs[sc->msg_idx].buf[sc->recv_bytes++] = TWSI_READ(sc, sc->reg_data);
- debugf(sc->dev, "Done RX data, send stop (2)\n");
+ debugf(sc, "Done RX data, send stop (2)\n");
if (!(sc->msgs[sc->msg_idx].flags & IIC_M_NOSTOP))
TWSI_WRITE(sc, sc->reg_control,
sc->control_val | TWSI_CONTROL_STOP);
} else {
- debugf(sc->dev, "No ack when receiving data, sending stop anyway\n");
+ debugf(sc, "No ack when receiving data, sending stop anyway\n");
if (!(sc->msgs[sc->msg_idx].flags & IIC_M_NOSTOP))
TWSI_WRITE(sc, sc->reg_control,
sc->control_val | TWSI_CONTROL_STOP);
@@ -661,14 +661,14 @@ twsi_intr(void *arg)
break;
default:
- debugf(sc->dev, "status=%x hot handled\n", status);
+ debugf(sc, "status=%x hot handled\n", status);
sc->transfer = 0;
sc->error = IIC_EBUSERR;
sc->control_val = 0;
wakeup(sc);
break;
}
- debugf(sc->dev, "Refresh reg_control\n");
+ debugf(sc, "Refresh reg_control\n");
/*
* Newer Allwinner chips clear IFLG after writing 1 to it.
@@ -676,7 +676,7 @@ twsi_intr(void *arg)
TWSI_WRITE(sc, sc->reg_control, sc->control_val |
(sc->iflag_w1c ? TWSI_CONTROL_IFLG : 0));
- debugf(sc->dev, "Done with interrupts\n\n");
+ debugf(sc, "Done with interrupts\n\n");
if (transfer_done == 1) {
sc->transfer = 0;
wakeup(sc);
@@ -701,6 +701,9 @@ int
twsi_attach(device_t dev)
{
struct twsi_softc *sc;
+ struct sysctl_ctx_list *ctx;
+ struct sysctl_oid *tree_node;
+ struct sysctl_oid_list *tree;
sc = device_get_softc(dev);
sc->dev = dev;
@@ -713,6 +716,15 @@ twsi_attach(device_t dev)
return (ENXIO);
}
+#ifdef TWSI_DEBUG
+ sc->debug = 1;
+#endif
+ ctx = device_get_sysctl_ctx(dev);
+ tree_node = device_get_sysctl_tree(dev);
+ tree = SYSCTL_CHILDREN(tree_node);
+ SYSCTL_ADD_INT(ctx, tree, OID_AUTO, "debug", CTLFLAG_RWTUN,
+ &sc->debug, 0, "Set debug level (zero to disable)");
+
/* Attach the iicbus. */
if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) {
device_printf(dev, "could not allocate iicbus instance\n");
diff --git a/sys/dev/iicbus/twsi/twsi.h b/sys/dev/iicbus/twsi/twsi.h
index b10ce45be6f4..ed0ea72ab819 100644
--- a/sys/dev/iicbus/twsi/twsi.h
+++ b/sys/dev/iicbus/twsi/twsi.h
@@ -64,6 +64,7 @@ struct twsi_softc {
uint16_t recv_bytes;
int transfer;
int error;
+ int debug;
uint32_t control_val;
bool iflag_w1c;