From: Kevin Paul Herbert <kph@platinasystems.com>
To: biwen.li@nxp.com, leoyang.li@nxp.com, linux@rempel-privat.de,
kernel@pengutronix.de, wsa@the-dreams.de, shawnguo@kernel.org,
s.hauer@pengutronix.de, festevam@gmail.com, aisheng.dong@nxp.com,
xiaoning.wang@nxp.com, o.rempel@pengutronix.de,
linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org,
jiafei.pan@nxp.com, xiaobo.xie@nxp.com,
linux-arm-kernel@lists.infradead.org, biwen.li@oss.nxp.com,
kph@platinasystems.com
Subject: [PATCH] i2c-imx.c: Synthesize end of transaction events without idle interrupts
Date: Tue, 22 Dec 2020 11:48:50 -0800 [thread overview]
Message-ID: <20201222194850.2274527-1-kph@platinasystems.com> (raw)
Only the Layerscape SoCs have interrupts on bus idle, which facilitate
sending events which complete slave bus transactions.
Add support for synthesizing missing events. If we see a master request,
or a newly addressed slave request, if the last event sent to the backend
was I2C_SLAVE_READ_REQUESTED, send the backend a I2C_SLAVE_READ_PROCESSED
followed by I2C_SLAVE_STOP. For all other events, send an I2C_SLAVE_STOP.
Signed-off-by: Kevin Paul Herbert <kph@platinasystems.com>
---
drivers/i2c/busses/i2c-imx.c | 59 +++++++++++++++++++++++++++++++-----
1 file changed, 52 insertions(+), 7 deletions(-)
diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index b444fbf1a262..b3e2a6a7fc19 100644
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -209,6 +209,7 @@ struct imx_i2c_struct {
struct imx_i2c_dma *dma;
struct i2c_client *slave;
+ enum i2c_slave_event last_slave_event;
};
static const struct imx_i2c_hwdata imx1_i2c_hwdata = {
@@ -662,6 +663,36 @@ static void i2c_imx_enable_bus_idle(struct imx_i2c_struct *i2c_imx)
}
}
+static void i2c_imx_slave_event(struct imx_i2c_struct *i2c_imx,
+ enum i2c_slave_event event, u8 *val)
+{
+ i2c_slave_event(i2c_imx->slave, event, val);
+ i2c_imx->last_slave_event = event;
+}
+
+static void i2c_imx_slave_finish_op(struct imx_i2c_struct *i2c_imx)
+{
+ u8 val;
+
+ while (i2c_imx->last_slave_event != I2C_SLAVE_STOP) {
+ switch (i2c_imx->last_slave_event) {
+ case I2C_SLAVE_READ_REQUESTED:
+ i2c_imx_slave_event(i2c_imx, I2C_SLAVE_READ_PROCESSED,
+ &val);
+ break;
+
+ case I2C_SLAVE_WRITE_REQUESTED:
+ case I2C_SLAVE_READ_PROCESSED:
+ case I2C_SLAVE_WRITE_RECEIVED:
+ i2c_imx_slave_event(i2c_imx, I2C_SLAVE_STOP, &val);
+ break;
+
+ case I2C_SLAVE_STOP:
+ break;
+ }
+ }
+}
+
static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx,
unsigned int status, unsigned int ctl)
{
@@ -674,9 +705,11 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx,
}
if (status & I2SR_IAAS) { /* Addressed as a slave */
+ i2c_imx_slave_finish_op(i2c_imx);
if (status & I2SR_SRW) { /* Master wants to read from us*/
dev_dbg(&i2c_imx->adapter.dev, "read requested");
- i2c_slave_event(i2c_imx->slave, I2C_SLAVE_READ_REQUESTED, &value);
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_READ_REQUESTED, &value);
/* Slave transmit */
ctl |= I2CR_MTX;
@@ -686,7 +719,8 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx,
imx_i2c_write_reg(value, i2c_imx, IMX_I2C_I2DR);
} else { /* Master wants to write to us */
dev_dbg(&i2c_imx->adapter.dev, "write requested");
- i2c_slave_event(i2c_imx->slave, I2C_SLAVE_WRITE_REQUESTED, &value);
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_WRITE_REQUESTED, &value);
/* Slave receive */
ctl &= ~I2CR_MTX;
@@ -697,17 +731,20 @@ static irqreturn_t i2c_imx_slave_isr(struct imx_i2c_struct *i2c_imx,
} else if (!(ctl & I2CR_MTX)) { /* Receive mode */
if (status & I2SR_IBB) { /* No STOP signal detected */
value = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2DR);
- i2c_slave_event(i2c_imx->slave, I2C_SLAVE_WRITE_RECEIVED, &value);
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_WRITE_RECEIVED, &value);
} else { /* STOP signal is detected */
dev_dbg(&i2c_imx->adapter.dev,
"STOP signal detected");
- i2c_slave_event(i2c_imx->slave, I2C_SLAVE_STOP, &value);
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_STOP, &value);
}
} else if (!(status & I2SR_RXAK)) { /* Transmit mode received ACK */
ctl |= I2CR_MTX;
imx_i2c_write_reg(ctl, i2c_imx, IMX_I2C_I2CR);
- i2c_slave_event(i2c_imx->slave, I2C_SLAVE_READ_PROCESSED, &value);
+ i2c_imx_slave_event(i2c_imx,
+ I2C_SLAVE_READ_PROCESSED, &value);
imx_i2c_write_reg(value, i2c_imx, IMX_I2C_I2DR);
} else { /* Transmit mode received NAK */
@@ -748,6 +785,7 @@ static int i2c_imx_reg_slave(struct i2c_client *client)
return -EBUSY;
i2c_imx->slave = client;
+ i2c_imx->last_slave_event = I2C_SLAVE_STOP;
/* Resume */
ret = pm_runtime_get_sync(i2c_imx->adapter.dev.parent);
@@ -800,10 +838,17 @@ static irqreturn_t i2c_imx_isr(int irq, void *dev_id)
status = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2SR);
ctl = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
+
if (status & I2SR_IIF) {
i2c_imx_clear_irq(i2c_imx, I2SR_IIF);
- if (i2c_imx->slave && !(ctl & I2CR_MSTA))
- return i2c_imx_slave_isr(i2c_imx, status, ctl);
+ if (i2c_imx->slave) {
+ if (!(ctl & I2CR_MSTA)) {
+ return i2c_imx_slave_isr(i2c_imx, status, ctl);
+ } else if (i2c_imx->last_slave_event !=
+ I2C_SLAVE_STOP) {
+ i2c_imx_slave_finish_op(i2c_imx);
+ }
+ }
return i2c_imx_master_isr(i2c_imx, status);
}
--
2.25.1
next reply other threads:[~2020-12-22 19:51 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-22 19:48 Kevin Paul Herbert [this message]
2021-01-08 8:05 ` [PATCH] i2c-imx.c: Synthesize end of transaction events without idle interrupts Oleksij Rempel
2021-01-15 1:27 ` Kevin Herbert
2021-01-28 9:20 ` Wolfram Sang
2021-02-01 22:13 ` Wolfram Sang
-- strict thread matches above, loose matches on Subject: below --
2020-12-18 17:53 Kevin Herbert
2020-12-19 14:47 ` Fabio Estevam
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