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i2c: omap: split out [XR]DR and [XR]RDY 

While they do pretty much the same thing, there
are a few peculiarities. Specially WRT erratas,
it's best to split those out and re-factor the
read/write loop to another function which both
cases call.

This last part will be done on another patch.

While at that, also avoid an unncessary register
read since dev->fifo_len will always contain the
correct amount of data to be transferred.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Felipe Balbi 2012-09-12 16:28:00 +05:30 committed by Wolfram Sang
parent 540a4790f7
commit 6d9939f651
1 changed files with 95 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

132
drivers/i2c/busses/i2c-omap.c
View File

@ -801,36 +801,24 @@ complete:
return IRQ_HANDLED;
}
if (stat & (OMAP_I2C_STAT_RRDY | OMAP_I2C_STAT_RDR)) {
if (stat & OMAP_I2C_STAT_RDR) {
u8 num_bytes = 1;
if (dev->errata & I2C_OMAP_ERRATA_I207)
i2c_omap_errata_i207(dev, stat);
if (dev->fifo_size)
num_bytes = dev->buf_len;
if (dev->fifo_size) {
if (stat & OMAP_I2C_STAT_RRDY)
num_bytes = dev->fifo_size;
else /* read RXSTAT on RDR interrupt */
num_bytes = (omap_i2c_read_reg(dev,
OMAP_I2C_BUFSTAT_REG)
>> 8) & 0x3F;
}
while (num_bytes--) {
if (!dev->buf_len) {
if (stat & OMAP_I2C_STAT_RRDY)
dev_err(dev->dev,
"RRDY IRQ while no data"
" requested\n");
if (stat & OMAP_I2C_STAT_RDR)
dev_err(dev->dev,
dev_err(dev->dev,
"RDR IRQ while no data"
" requested\n");
" requested\n");
break;
}
w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
*dev->buf++ = w;
dev->buf_len--;
/*
* Data reg in 2430, omap3 and
* omap4 is 8 bit wide
@ -843,29 +831,58 @@ complete:
}
}
}
omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_RRDY |
OMAP_I2C_STAT_RDR));
if (dev->errata & I2C_OMAP_ERRATA_I207)
i2c_omap_errata_i207(dev, stat);
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RDR);
continue;
}
if (stat & (OMAP_I2C_STAT_XRDY | OMAP_I2C_STAT_XDR)) {
if (stat & OMAP_I2C_STAT_RRDY) {
u8 num_bytes = 1;
if (dev->fifo_size) {
if (stat & OMAP_I2C_STAT_XRDY)
num_bytes = dev->fifo_size;
else /* read TXSTAT on XDR interrupt */
num_bytes = omap_i2c_read_reg(dev,
OMAP_I2C_BUFSTAT_REG)
& 0x3F;
}
if (dev->fifo_size)
num_bytes = dev->fifo_size;
while (num_bytes--) {
if (!dev->buf_len) {
if (stat & OMAP_I2C_STAT_XRDY)
dev_err(dev->dev,
"XRDY IRQ while no "
"data to send\n");
if (stat & OMAP_I2C_STAT_XDR)
dev_err(dev->dev,
dev_err(dev->dev,
"RRDY IRQ while no data"
" requested\n");
break;
}
w = omap_i2c_read_reg(dev, OMAP_I2C_DATA_REG);
*dev->buf++ = w;
dev->buf_len--;
/*
* Data reg in 2430, omap3 and
* omap4 is 8 bit wide
*/
if (dev->flags &
OMAP_I2C_FLAG_16BIT_DATA_REG) {
if (dev->buf_len) {
*dev->buf++ = w >> 8;
dev->buf_len--;
}
}
}
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_RRDY);
continue;
}
if (stat & OMAP_I2C_STAT_XDR) {
u8 num_bytes = 1;
if (dev->fifo_size)
num_bytes = dev->buf_len;
while (num_bytes--) {
if (!dev->buf_len) {
dev_err(dev->dev,
"XDR IRQ while no "
"data to send\n");
break;
@ -873,6 +890,7 @@ complete:
w = *dev->buf++;
dev->buf_len--;
/*
* Data reg in 2430, omap3 and
* omap4 is 8 bit wide
@ -891,8 +909,48 @@ complete:
omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
}
omap_i2c_ack_stat(dev, (OMAP_I2C_STAT_XRDY |
OMAP_I2C_STAT_XDR));
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XDR);
continue;
}
if (stat & OMAP_I2C_STAT_XRDY) {
u8 num_bytes = 1;
if (dev->fifo_size)
num_bytes = dev->fifo_size;
while (num_bytes--) {
if (!dev->buf_len) {
dev_err(dev->dev,
"XRDY IRQ while no "
"data to send\n");
break;
}
w = *dev->buf++;
dev->buf_len--;
/*
* Data reg in 2430, omap3 and
* omap4 is 8 bit wide
*/
if (dev->flags &
OMAP_I2C_FLAG_16BIT_DATA_REG) {
if (dev->buf_len) {
w |= *dev->buf++ << 8;
dev->buf_len--;
}
}
if ((dev->errata & I2C_OMAP_ERRATA_I462) &&
errata_omap3_i462(dev, &stat, &err))
goto complete;
omap_i2c_write_reg(dev, OMAP_I2C_DATA_REG, w);
}
omap_i2c_ack_stat(dev, OMAP_I2C_STAT_XRDY);
continue;
}