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