mirror of
https://github.com/Ysurac/openmptcprouter.git
synced 2025-03-09 15:40:20 +00:00
RPI kernel 4.19 support
This commit is contained in:
Ycarus
parent
e79d4c1771
commit
e253715ce5
432 changed files with 335303 additions and 0 deletions
|
|
@ -0,0 +1,194 @@
|
|||
From cf95faa3f38ed696e6dae30d9e9517b43e1a5aa0 Mon Sep 17 00:00:00 2001
|
||||
From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org>
|
||||
Date: Tue, 1 Nov 2016 15:15:41 +0100
|
||||
Subject: [PATCH 029/432] i2c: bcm2835: Add debug support
|
||||
MIME-Version: 1.0
|
||||
Content-Type: text/plain; charset=UTF-8
|
||||
Content-Transfer-Encoding: 8bit
|
||||
|
||||
This adds a debug module parameter to aid in debugging transfer issues
|
||||
by printing info to the kernel log. When enabled, status values are
|
||||
collected in the interrupt routine and msg info in
|
||||
bcm2835_i2c_start_transfer(). This is done in a way that tries to avoid
|
||||
affecting timing. Having printk in the isr can mask issues.
|
||||
|
||||
debug values (additive):
|
||||
1: Print info on error
|
||||
2: Print info on all transfers
|
||||
3: Print messages before transfer is started
|
||||
|
||||
The value can be changed at runtime:
|
||||
/sys/module/i2c_bcm2835/parameters/debug
|
||||
|
||||
Example output, debug=3:
|
||||
[ 747.114448] bcm2835_i2c_xfer: msg(1/2) write addr=0x54, len=2 flags= [i2c1]
|
||||
[ 747.114463] bcm2835_i2c_xfer: msg(2/2) read addr=0x54, len=32 flags= [i2c1]
|
||||
[ 747.117809] start_transfer: msg(1/2) write addr=0x54, len=2 flags= [i2c1]
|
||||
[ 747.117825] isr: remain=2, status=0x30000055 : TA TXW TXD TXE [i2c1]
|
||||
[ 747.117839] start_transfer: msg(2/2) read addr=0x54, len=32 flags= [i2c1]
|
||||
[ 747.117849] isr: remain=32, status=0xd0000039 : TA RXR TXD RXD [i2c1]
|
||||
[ 747.117861] isr: remain=20, status=0xd0000039 : TA RXR TXD RXD [i2c1]
|
||||
[ 747.117870] isr: remain=8, status=0x32 : DONE TXD RXD [i2c1]
|
||||
|
||||
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
|
||||
---
|
||||
drivers/i2c/busses/i2c-bcm2835.c | 99 +++++++++++++++++++++++++++++++-
|
||||
1 file changed, 98 insertions(+), 1 deletion(-)
|
||||
|
||||
diff --git a/drivers/i2c/busses/i2c-bcm2835.c b/drivers/i2c/busses/i2c-bcm2835.c
|
||||
index 4d19254f78c8..1426dab2670b 100644
|
||||
--- a/drivers/i2c/busses/i2c-bcm2835.c
|
||||
+++ b/drivers/i2c/busses/i2c-bcm2835.c
|
||||
@@ -56,6 +56,18 @@
|
||||
#define BCM2835_I2C_CDIV_MIN 0x0002
|
||||
#define BCM2835_I2C_CDIV_MAX 0xFFFE
|
||||
|
||||
+static unsigned int debug;
|
||||
+module_param(debug, uint, 0644);
|
||||
+MODULE_PARM_DESC(debug, "1=err, 2=isr, 3=xfer");
|
||||
+
|
||||
+#define BCM2835_DEBUG_MAX 512
|
||||
+struct bcm2835_debug {
|
||||
+ struct i2c_msg *msg;
|
||||
+ int msg_idx;
|
||||
+ size_t remain;
|
||||
+ u32 status;
|
||||
+};
|
||||
+
|
||||
struct bcm2835_i2c_dev {
|
||||
struct device *dev;
|
||||
void __iomem *regs;
|
||||
@@ -69,8 +81,78 @@ struct bcm2835_i2c_dev {
|
||||
u32 msg_err;
|
||||
u8 *msg_buf;
|
||||
size_t msg_buf_remaining;
|
||||
+ struct bcm2835_debug debug[BCM2835_DEBUG_MAX];
|
||||
+ unsigned int debug_num;
|
||||
+ unsigned int debug_num_msgs;
|
||||
};
|
||||
|
||||
+static inline void bcm2835_debug_add(struct bcm2835_i2c_dev *i2c_dev, u32 s)
|
||||
+{
|
||||
+ if (!i2c_dev->debug_num_msgs || i2c_dev->debug_num >= BCM2835_DEBUG_MAX)
|
||||
+ return;
|
||||
+
|
||||
+ i2c_dev->debug[i2c_dev->debug_num].msg = i2c_dev->curr_msg;
|
||||
+ i2c_dev->debug[i2c_dev->debug_num].msg_idx =
|
||||
+ i2c_dev->debug_num_msgs - i2c_dev->num_msgs;
|
||||
+ i2c_dev->debug[i2c_dev->debug_num].remain = i2c_dev->msg_buf_remaining;
|
||||
+ i2c_dev->debug[i2c_dev->debug_num].status = s;
|
||||
+ i2c_dev->debug_num++;
|
||||
+}
|
||||
+
|
||||
+static void bcm2835_debug_print_status(struct bcm2835_i2c_dev *i2c_dev,
|
||||
+ struct bcm2835_debug *d)
|
||||
+{
|
||||
+ u32 s = d->status;
|
||||
+
|
||||
+ pr_info("isr: remain=%zu, status=0x%x : %s%s%s%s%s%s%s%s%s%s [i2c%d]\n",
|
||||
+ d->remain, s,
|
||||
+ s & BCM2835_I2C_S_TA ? "TA " : "",
|
||||
+ s & BCM2835_I2C_S_DONE ? "DONE " : "",
|
||||
+ s & BCM2835_I2C_S_TXW ? "TXW " : "",
|
||||
+ s & BCM2835_I2C_S_RXR ? "RXR " : "",
|
||||
+ s & BCM2835_I2C_S_TXD ? "TXD " : "",
|
||||
+ s & BCM2835_I2C_S_RXD ? "RXD " : "",
|
||||
+ s & BCM2835_I2C_S_TXE ? "TXE " : "",
|
||||
+ s & BCM2835_I2C_S_RXF ? "RXF " : "",
|
||||
+ s & BCM2835_I2C_S_ERR ? "ERR " : "",
|
||||
+ s & BCM2835_I2C_S_CLKT ? "CLKT " : "",
|
||||
+ i2c_dev->adapter.nr);
|
||||
+}
|
||||
+
|
||||
+static void bcm2835_debug_print_msg(struct bcm2835_i2c_dev *i2c_dev,
|
||||
+ struct i2c_msg *msg, int i, int total,
|
||||
+ const char *fname)
|
||||
+{
|
||||
+ pr_info("%s: msg(%d/%d) %s addr=0x%02x, len=%u flags=%s%s%s%s%s%s%s [i2c%d]\n",
|
||||
+ fname, i, total,
|
||||
+ msg->flags & I2C_M_RD ? "read" : "write", msg->addr, msg->len,
|
||||
+ msg->flags & I2C_M_TEN ? "TEN" : "",
|
||||
+ msg->flags & I2C_M_RECV_LEN ? "RECV_LEN" : "",
|
||||
+ msg->flags & I2C_M_NO_RD_ACK ? "NO_RD_ACK" : "",
|
||||
+ msg->flags & I2C_M_IGNORE_NAK ? "IGNORE_NAK" : "",
|
||||
+ msg->flags & I2C_M_REV_DIR_ADDR ? "REV_DIR_ADDR" : "",
|
||||
+ msg->flags & I2C_M_NOSTART ? "NOSTART" : "",
|
||||
+ msg->flags & I2C_M_STOP ? "STOP" : "",
|
||||
+ i2c_dev->adapter.nr);
|
||||
+}
|
||||
+
|
||||
+static void bcm2835_debug_print(struct bcm2835_i2c_dev *i2c_dev)
|
||||
+{
|
||||
+ struct bcm2835_debug *d;
|
||||
+ unsigned int i;
|
||||
+
|
||||
+ for (i = 0; i < i2c_dev->debug_num; i++) {
|
||||
+ d = &i2c_dev->debug[i];
|
||||
+ if (d->status == ~0)
|
||||
+ bcm2835_debug_print_msg(i2c_dev, d->msg, d->msg_idx,
|
||||
+ i2c_dev->debug_num_msgs, "start_transfer");
|
||||
+ else
|
||||
+ bcm2835_debug_print_status(i2c_dev, d);
|
||||
+ }
|
||||
+ if (i2c_dev->debug_num >= BCM2835_DEBUG_MAX)
|
||||
+ pr_info("BCM2835_DEBUG_MAX reached\n");
|
||||
+}
|
||||
+
|
||||
static inline void bcm2835_i2c_writel(struct bcm2835_i2c_dev *i2c_dev,
|
||||
u32 reg, u32 val)
|
||||
{
|
||||
@@ -189,6 +271,7 @@ static void bcm2835_i2c_start_transfer(struct bcm2835_i2c_dev *i2c_dev)
|
||||
bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_A, msg->addr);
|
||||
bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_DLEN, msg->len);
|
||||
bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C, c);
|
||||
+ bcm2835_debug_add(i2c_dev, ~0);
|
||||
}
|
||||
|
||||
static void bcm2835_i2c_finish_transfer(struct bcm2835_i2c_dev *i2c_dev)
|
||||
@@ -215,6 +298,7 @@ static irqreturn_t bcm2835_i2c_isr(int this_irq, void *data)
|
||||
u32 val, err;
|
||||
|
||||
val = bcm2835_i2c_readl(i2c_dev, BCM2835_I2C_S);
|
||||
+ bcm2835_debug_add(i2c_dev, val);
|
||||
|
||||
err = val & (BCM2835_I2C_S_CLKT | BCM2835_I2C_S_ERR);
|
||||
if (err) {
|
||||
@@ -281,6 +365,13 @@ static int bcm2835_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
|
||||
unsigned long time_left;
|
||||
int i, ret;
|
||||
|
||||
+ if (debug)
|
||||
+ i2c_dev->debug_num_msgs = num;
|
||||
+
|
||||
+ if (debug > 2)
|
||||
+ for (i = 0; i < num; i++)
|
||||
+ bcm2835_debug_print_msg(i2c_dev, &msgs[i], i + 1, num, __func__);
|
||||
+
|
||||
for (i = 0; i < (num - 1); i++)
|
||||
if (msgs[i].flags & I2C_M_RD) {
|
||||
dev_warn_once(i2c_dev->dev,
|
||||
@@ -303,6 +394,10 @@ static int bcm2835_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
|
||||
|
||||
bcm2835_i2c_finish_transfer(i2c_dev);
|
||||
|
||||
+ if (debug > 1 || (debug && (!time_left || i2c_dev->msg_err)))
|
||||
+ bcm2835_debug_print(i2c_dev);
|
||||
+ i2c_dev->debug_num_msgs = 0;
|
||||
+ i2c_dev->debug_num = 0;
|
||||
if (!time_left) {
|
||||
bcm2835_i2c_writel(i2c_dev, BCM2835_I2C_C,
|
||||
BCM2835_I2C_C_CLEAR);
|
||||
@@ -313,7 +408,9 @@ static int bcm2835_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[],
|
||||
if (!i2c_dev->msg_err)
|
||||
return num;
|
||||
|
||||
- dev_dbg(i2c_dev->dev, "i2c transfer failed: %x\n", i2c_dev->msg_err);
|
||||
+ if (debug)
|
||||
+ dev_err(i2c_dev->dev, "i2c transfer failed: %x\n",
|
||||
+ i2c_dev->msg_err);
|
||||
|
||||
if (i2c_dev->msg_err & BCM2835_I2C_S_ERR)
|
||||
return -EREMOTEIO;
|
||||
--
|
||||
2.19.1
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue