author: H. Nikolaus Schaller <hns@goldelico.com> 2020-05-23 19:32:56 +0200
committer: Greg Kroah-Hartman <gregkh@linuxfoundation.org> 2020-05-27 12:18:49 +0200
commit: 13db4c40fe0b20b80c7d1c91a9da8411e26b5c27
parent: 2d4100632fa1947bf3e8d7a091e94e2cf21923af
Commit Summary:
Diffstat:
1 file changed, 41 insertions, 20 deletions
diff --git a/drivers/w1/masters/omap_hdq.c b/drivers/w1/masters/omap_hdq.c
index 9f9ec108b189..a6484700f3b3 100644
--- a/drivers/w1/masters/omap_hdq.c
+++ b/drivers/w1/masters/omap_hdq.c
@@ -54,10 +54,10 @@ MODULE_PARM_DESC(w1_id, "1-wire id for the slave detection in HDQ mode");
struct hdq_data {
struct device *dev;
void __iomem *hdq_base;
- /* lock status update */
+ /* lock read/write/break operations */
struct mutex hdq_mutex;
+ /* interrupt status and a lock for it */
u8 hdq_irqstatus;
- /* device lock */
spinlock_t hdq_spinlock;
/* mode: 0-HDQ 1-W1 */
int mode;
@@ -120,13 +120,18 @@ static int hdq_wait_for_flag(struct hdq_data *hdq_data, u32 offset,
}
/* Clear saved irqstatus after using an interrupt */
-static void hdq_reset_irqstatus(struct hdq_data *hdq_data)
+static u8 hdq_reset_irqstatus(struct hdq_data *hdq_data, u8 bits)
{
unsigned long irqflags;
+ u8 status;
spin_lock_irqsave(&hdq_data->hdq_spinlock, irqflags);
- hdq_data->hdq_irqstatus = 0;
+ status = hdq_data->hdq_irqstatus;
+ /* this is a read-modify-write */
+ hdq_data->hdq_irqstatus &= ~bits;
spin_unlock_irqrestore(&hdq_data->hdq_spinlock, irqflags);
+
+ return status;
}
/* write out a byte and fill *status with HDQ_INT_STATUS */
@@ -135,6 +140,12 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
int ret;
u8 tmp_status;
+ ret = mutex_lock_interruptible(&hdq_data->hdq_mutex);
+ if (ret < 0) {
+ ret = -EINTR;
+ goto rtn;
+ }
+
*status = 0;
hdq_reg_out(hdq_data, OMAP_HDQ_TX_DATA, val);
@@ -144,14 +155,15 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
OMAP_HDQ_CTRL_STATUS_DIR | OMAP_HDQ_CTRL_STATUS_GO);
/* wait for the TXCOMPLETE bit */
ret = wait_event_timeout(hdq_wait_queue,
- hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT);
+ (hdq_data->hdq_irqstatus & OMAP_HDQ_INT_STATUS_TXCOMPLETE),
+ OMAP_HDQ_TIMEOUT);
+ *status = hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_TXCOMPLETE);
if (ret == 0) {
dev_dbg(hdq_data->dev, "TX wait elapsed\n");
ret = -ETIMEDOUT;
goto out;
}
- *status = hdq_data->hdq_irqstatus;
/* check irqstatus */
if (!(*status & OMAP_HDQ_INT_STATUS_TXCOMPLETE)) {
dev_dbg(hdq_data->dev, "timeout waiting for"
@@ -170,7 +182,8 @@ static int hdq_write_byte(struct hdq_data *hdq_data, u8 val, u8 *status)
}
out:
- hdq_reset_irqstatus(hdq_data);
+ mutex_unlock(&hdq_data->hdq_mutex);
+rtn:
return ret;
}
@@ -181,7 +194,7 @@ static irqreturn_t hdq_isr(int irq, void *_hdq)
unsigned long irqflags;
spin_lock_irqsave(&hdq_data->hdq_spinlock, irqflags);
- hdq_data->hdq_irqstatus = hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS);
+ hdq_data->hdq_irqstatus |= hdq_reg_in(hdq_data, OMAP_HDQ_INT_STATUS);
spin_unlock_irqrestore(&hdq_data->hdq_spinlock, irqflags);
dev_dbg(hdq_data->dev, "hdq_isr: %x\n", hdq_data->hdq_irqstatus);
@@ -238,18 +251,19 @@ static int omap_hdq_break(struct hdq_data *hdq_data)
/* wait for the TIMEOUT bit */
ret = wait_event_timeout(hdq_wait_queue,
- hdq_data->hdq_irqstatus, OMAP_HDQ_TIMEOUT);
+ (hdq_data->hdq_irqstatus & OMAP_HDQ_INT_STATUS_TIMEOUT),
+ OMAP_HDQ_TIMEOUT);
+ tmp_status = hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_TIMEOUT);
if (ret == 0) {
dev_dbg(hdq_data->dev, "break wait elapsed\n");
ret = -EINTR;
goto out;
}
- tmp_status = hdq_data->hdq_irqstatus;
/* check irqstatus */
if (!(tmp_status & OMAP_HDQ_INT_STATUS_TIMEOUT)) {
dev_dbg(hdq_data->dev, "timeout waiting for TIMEOUT, %x\n",
- tmp_status);
+ tmp_status);
ret = -ETIMEDOUT;
goto out;
}
@@ -278,7 +292,6 @@ static int omap_hdq_break(struct hdq_data *hdq_data)
" return to zero, %x\n", tmp_status);
out:
- hdq_reset_irqstatus(hdq_data);
mutex_unlock(&hdq_data->hdq_mutex);
rtn:
return ret;
@@ -309,12 +322,15 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
*/
wait_event_timeout(hdq_wait_queue,
(hdq_data->hdq_irqstatus
- & OMAP_HDQ_INT_STATUS_RXCOMPLETE),
+ & (OMAP_HDQ_INT_STATUS_RXCOMPLETE |
+ OMAP_HDQ_INT_STATUS_TIMEOUT)),
OMAP_HDQ_TIMEOUT);
-
+ status = hdq_reset_irqstatus(hdq_data,
+ OMAP_HDQ_INT_STATUS_RXCOMPLETE |
+ OMAP_HDQ_INT_STATUS_TIMEOUT);
hdq_reg_merge(hdq_data, OMAP_HDQ_CTRL_STATUS, 0,
OMAP_HDQ_CTRL_STATUS_DIR);
- status = hdq_data->hdq_irqstatus;
+
/* check irqstatus */
if (!(status & OMAP_HDQ_INT_STATUS_RXCOMPLETE)) {
dev_dbg(hdq_data->dev, "timeout waiting for"
@@ -322,11 +338,12 @@ static int hdq_read_byte(struct hdq_data *hdq_data, u8 *val)
ret = -ETIMEDOUT;
goto out;
}
+ } else { /* interrupt had occurred before hdq_read_byte was called */
+ hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_RXCOMPLETE);
}
/* the data is ready. Read it in! */
*val = hdq_reg_in(hdq_data, OMAP_HDQ_RX_DATA);
out:
- hdq_reset_irqstatus(hdq_data);
mutex_unlock(&hdq_data->hdq_mutex);
rtn:
return ret;
@@ -367,15 +384,15 @@ static u8 omap_w1_triplet(void *_hdq, u8 bdir)
(hdq_data->hdq_irqstatus
& OMAP_HDQ_INT_STATUS_RXCOMPLETE),
OMAP_HDQ_TIMEOUT);
+ /* Must clear irqstatus for another RXCOMPLETE interrupt */
+ hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_RXCOMPLETE);
+
if (err == 0) {
dev_dbg(hdq_data->dev, "RX wait elapsed\n");
goto out;
}
id_bit = (hdq_reg_in(_hdq, OMAP_HDQ_RX_DATA) & 0x01);
- /* Must clear irqstatus for another RXCOMPLETE interrupt */
- hdq_reset_irqstatus(hdq_data);
-
/* read comp_bit */
hdq_reg_merge(_hdq, OMAP_HDQ_CTRL_STATUS,
ctrl | OMAP_HDQ_CTRL_STATUS_DIR, mask);
@@ -383,6 +400,9 @@ static u8 omap_w1_triplet(void *_hdq, u8 bdir)
(hdq_data->hdq_irqstatus
& OMAP_HDQ_INT_STATUS_RXCOMPLETE),
OMAP_HDQ_TIMEOUT);
+ /* Must clear irqstatus for another RXCOMPLETE interrupt */
+ hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_RXCOMPLETE);
+
if (err == 0) {
dev_dbg(hdq_data->dev, "RX wait elapsed\n");
goto out;
@@ -409,6 +429,9 @@ static u8 omap_w1_triplet(void *_hdq, u8 bdir)
(hdq_data->hdq_irqstatus
& OMAP_HDQ_INT_STATUS_TXCOMPLETE),
OMAP_HDQ_TIMEOUT);
+ /* Must clear irqstatus for another TXCOMPLETE interrupt */
+ hdq_reset_irqstatus(hdq_data, OMAP_HDQ_INT_STATUS_TXCOMPLETE);
+
if (err == 0) {
dev_dbg(hdq_data->dev, "TX wait elapsed\n");
goto out;
@@ -418,7 +441,6 @@ static u8 omap_w1_triplet(void *_hdq, u8 bdir)
OMAP_HDQ_CTRL_STATUS_SINGLE);
out:
- hdq_reset_irqstatus(hdq_data);
mutex_unlock(&hdq_data->hdq_mutex);
rtn:
pm_runtime_mark_last_busy(hdq_data->dev);