aboutsummaryrefslogtreecommitdiff
path: root/drivers/i2c/busses
diff options
context:
space:
mode:
authorPaul Mackerras <paulus@samba.org>2006-08-01 10:37:25 +1000
committerPaul Mackerras <paulus@samba.org>2006-08-01 10:37:25 +1000
commit57cad8084e0837e0f2c97da789ec9b3f36809be9 (patch)
treee9c790afb4286f78cb08d9664f58baa7e876fe55 /drivers/i2c/busses
parentcb18bd40030c879cd93fef02fd579f74dbab473d (diff)
parent49b1e3ea19b1c95c2f012b8331ffb3b169e4c042 (diff)
Merge branch 'merge'
Diffstat (limited to 'drivers/i2c/busses')
-rw-r--r--drivers/i2c/busses/i2c-iop3xx.c17
-rw-r--r--drivers/i2c/busses/i2c-iop3xx.h2
-rw-r--r--drivers/i2c/busses/i2c-powermac.c4
-rw-r--r--drivers/i2c/busses/scx200_acb.c20
4 files changed, 24 insertions, 19 deletions
diff --git a/drivers/i2c/busses/i2c-iop3xx.c b/drivers/i2c/busses/i2c-iop3xx.c
index aca7e166860..48c56939c86 100644
--- a/drivers/i2c/busses/i2c-iop3xx.c
+++ b/drivers/i2c/busses/i2c-iop3xx.c
@@ -21,6 +21,9 @@
* - Make it work with IXP46x chips
* - Cleanup function names, coding style, etc
*
+ * - writing to slave address causes latchup on iop331.
+ * fix: driver refuses to address self.
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2.
@@ -73,12 +76,6 @@ iop3xx_i2c_reset(struct i2c_algo_iop3xx_data *iop3xx_adap)
}
static void
-iop3xx_i2c_set_slave_addr(struct i2c_algo_iop3xx_data *iop3xx_adap)
-{
- __raw_writel(MYSAR, iop3xx_adap->ioaddr + SAR_OFFSET);
-}
-
-static void
iop3xx_i2c_enable(struct i2c_algo_iop3xx_data *iop3xx_adap)
{
u32 cr = IOP3XX_ICR_GCD | IOP3XX_ICR_SCLEN | IOP3XX_ICR_UE;
@@ -248,6 +245,13 @@ iop3xx_i2c_send_target_addr(struct i2c_algo_iop3xx_data *iop3xx_adap,
int status;
int rc;
+ /* avoid writing to my slave address (hangs on 80331),
+ * forbidden in Intel developer manual
+ */
+ if (msg->addr == MYSAR) {
+ return -EBUSY;
+ }
+
__raw_writel(iic_cook_addr(msg), iop3xx_adap->ioaddr + DBR_OFFSET);
cr &= ~(IOP3XX_ICR_MSTOP | IOP3XX_ICR_NACK);
@@ -498,7 +502,6 @@ iop3xx_i2c_probe(struct platform_device *pdev)
spin_lock_init(&adapter_data->lock);
iop3xx_i2c_reset(adapter_data);
- iop3xx_i2c_set_slave_addr(adapter_data);
iop3xx_i2c_enable(adapter_data);
platform_set_drvdata(pdev, new_adapter);
diff --git a/drivers/i2c/busses/i2c-iop3xx.h b/drivers/i2c/busses/i2c-iop3xx.h
index e46ebaea7b1..8485861f6a3 100644
--- a/drivers/i2c/busses/i2c-iop3xx.h
+++ b/drivers/i2c/busses/i2c-iop3xx.h
@@ -80,7 +80,7 @@
#define IOP3XX_GPOD_I2C0 0x00c0 /* clear these bits to enable ch0 */
#define IOP3XX_GPOD_I2C1 0x0030 /* clear these bits to enable ch1 */
-#define MYSAR 0x02 /* SWAG a suitable slave address */
+#define MYSAR 0 /* default slave address */
#define I2C_ERR 321
#define I2C_ERR_BERR (I2C_ERR+0)
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index e8a6de5a151..d658d910795 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -148,8 +148,6 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
int read;
int addrdir;
- if (num != 1)
- return -EINVAL;
if (msgs->flags & I2C_M_TEN)
return -EINVAL;
read = (msgs->flags & I2C_M_RD) != 0;
@@ -166,7 +164,7 @@ static int i2c_powermac_master_xfer( struct i2c_adapter *adap,
rc = pmac_i2c_xfer(bus, addrdir, 0, 0, msgs->buf, msgs->len);
bail:
pmac_i2c_close(bus);
- return rc < 0 ? rc : msgs->len;
+ return rc < 0 ? rc : 1;
}
static u32 i2c_powermac_func(struct i2c_adapter * adapter)
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index 22a3eda0416..ced309ff056 100644
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -184,21 +184,21 @@ static void scx200_acb_machine(struct scx200_acb_iface *iface, u8 status)
break;
case state_read:
- /* Set ACK if receiving the last byte */
- if (iface->len == 1)
+ /* Set ACK if _next_ byte will be the last one */
+ if (iface->len == 2)
outb(inb(ACBCTL1) | ACBCTL1_ACK, ACBCTL1);
else
outb(inb(ACBCTL1) & ~ACBCTL1_ACK, ACBCTL1);
- *iface->ptr++ = inb(ACBSDA);
- --iface->len;
-
- if (iface->len == 0) {
+ if (iface->len == 1) {
iface->result = 0;
iface->state = state_idle;
outb(inb(ACBCTL1) | ACBCTL1_STOP, ACBCTL1);
}
+ *iface->ptr++ = inb(ACBSDA);
+ --iface->len;
+
break;
case state_write:
@@ -307,8 +307,12 @@ static s32 scx200_acb_smbus_xfer(struct i2c_adapter *adapter,
buffer = (u8 *)&cur_word;
break;
- case I2C_SMBUS_BLOCK_DATA:
+ case I2C_SMBUS_I2C_BLOCK_DATA:
+ if (rw == I2C_SMBUS_READ)
+ data->block[0] = I2C_SMBUS_BLOCK_MAX; /* For now */
len = data->block[0];
+ if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
+ return -EINVAL;
buffer = &data->block[1];
break;
@@ -372,7 +376,7 @@ static u32 scx200_acb_func(struct i2c_adapter *adapter)
{
return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA |
- I2C_FUNC_SMBUS_BLOCK_DATA;
+ I2C_FUNC_SMBUS_I2C_BLOCK;
}
/* For now, we only handle combined mode (smbus) */