mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-30 21:39:43 +02:00
1bf2f96f67
Signed-off-by: Tim Harvey <tharvey@gateworks.com> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@33565 3c298f89-4303-0410-b956-a3cf2f4a3e73
73 lines
2.1 KiB
Diff
73 lines
2.1 KiB
Diff
--- a/drivers/i2c/busses/i2c-cns3xxx.c
|
|
+++ b/drivers/i2c/busses/i2c-cns3xxx.c
|
|
@@ -2,8 +2,9 @@
|
|
* Cavium CNS3xxx I2C Host Controller
|
|
*
|
|
* Copyright 2010 Cavium Network
|
|
- * Copyright 2011 Gateworks Corporation
|
|
+ * Copyright 2012 Gateworks Corporation
|
|
* Chris Lang <clang@gateworks.com>
|
|
+ * Tim Harvey <tharvey@gateworks.com>
|
|
*
|
|
* This file is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License, Version 2, as
|
|
@@ -63,13 +64,15 @@
|
|
#define STATE_ERROR 2
|
|
|
|
struct cns3xxx_i2c {
|
|
- void __iomem *base;
|
|
- wait_queue_head_t wait;
|
|
- struct i2c_adapter adap;
|
|
- struct i2c_msg *msg;
|
|
- int state; /* see STATE_ */
|
|
- int rd_wr_len;
|
|
- u8 *buf;
|
|
+ struct device *dev;
|
|
+ void __iomem *base; /* virtual */
|
|
+ wait_queue_head_t wait;
|
|
+ struct i2c_adapter adap;
|
|
+ struct i2c_msg *msg;
|
|
+ u8 state; /* see STATE_ */
|
|
+ u8 error; /* see TWI_STATUS register */
|
|
+ int rd_wr_len;
|
|
+ u8 *buf;
|
|
};
|
|
|
|
static u32 cns3xxx_i2c_func(struct i2c_adapter *adap)
|
|
@@ -150,14 +153,18 @@ cns3xxx_i2c_xfer_msg(struct i2c_adapter
|
|
|
|
// Start the Transfer
|
|
i2c->state = 0; // Clear out the State
|
|
+ i2c->error = 0;
|
|
I2C_CONTROLLER_REG |= (1 << 6);
|
|
|
|
if (wait_event_timeout(i2c->wait, (i2c->state == STATE_ERROR) ||
|
|
(i2c->state == STATE_DONE), TWI_TIMEOUT)) {
|
|
if (i2c->state == STATE_ERROR) {
|
|
- return -EIO;
|
|
+ dev_dbg(i2c->dev, "controller error: 0x%2x", i2c->error);
|
|
+ return -EAGAIN; // try again
|
|
}
|
|
} else {
|
|
+ dev_err(i2c->dev, "controller timed out "
|
|
+ "waiting for start condition to finish\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
}
|
|
@@ -238,6 +245,7 @@ static irqreturn_t cns3xxx_i2c_isr(int i
|
|
|
|
if (stat & I2C_BUS_ERROR_FLAG) {
|
|
i2c->state = STATE_ERROR;
|
|
+ i2c->error = (I2C_INTERRUPT_STATUS_REG & 0xff00)>>8;
|
|
} else {
|
|
if (i2c->msg->flags & I2C_M_RD) {
|
|
for (i = 0; i <= i2c->rd_wr_len; i++)
|
|
@@ -280,6 +288,7 @@ static int __devinit cns3xxx_i2c_probe(s
|
|
goto request_mem_failed;
|
|
}
|
|
|
|
+ i2c->dev = &pdev->dev;
|
|
i2c->base = ioremap(res->start, res->end - res->start + 1);
|
|
if (!i2c->base) {
|
|
dev_err(&pdev->dev, "Unable to map registers\n");
|