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Diffstat (limited to 'drivers/i2c/busses/i2c-eg20t.c')
-rw-r--r--drivers/i2c/busses/i2c-eg20t.c248
1 files changed, 76 insertions, 172 deletions
diff --git a/drivers/i2c/busses/i2c-eg20t.c b/drivers/i2c/busses/i2c-eg20t.c
index f086131cb1c..2f74ae872e1 100644
--- a/drivers/i2c/busses/i2c-eg20t.c
+++ b/drivers/i2c/busses/i2c-eg20t.c
@@ -263,11 +263,6 @@ static void pch_i2c_init(struct i2c_algo_pch_data *adap)
init_waitqueue_head(&pch_event);
}
-static inline bool ktime_lt(const ktime_t cmp1, const ktime_t cmp2)
-{
- return cmp1.tv64 < cmp2.tv64;
-}
-
/**
* pch_i2c_wait_for_bus_idle() - check the status of bus.
* @adap: Pointer to struct i2c_algo_pch_data.
@@ -317,33 +312,6 @@ static void pch_i2c_start(struct i2c_algo_pch_data *adap)
}
/**
- * pch_i2c_wait_for_xfer_complete() - initiates a wait for the tx complete event
- * @adap: Pointer to struct i2c_algo_pch_data.
- */
-static s32 pch_i2c_wait_for_xfer_complete(struct i2c_algo_pch_data *adap)
-{
- long ret;
- ret = wait_event_timeout(pch_event,
- (adap->pch_event_flag != 0), msecs_to_jiffies(50));
-
- if (ret == 0) {
- pch_err(adap, "timeout: %x\n", adap->pch_event_flag);
- adap->pch_event_flag = 0;
- return -ETIMEDOUT;
- }
-
- if (adap->pch_event_flag & I2C_ERROR_MASK) {
- pch_err(adap, "error bits set: %x\n", adap->pch_event_flag);
- adap->pch_event_flag = 0;
- return -EIO;
- }
-
- adap->pch_event_flag = 0;
-
- return 0;
-}
-
-/**
* pch_i2c_getack() - to confirm ACK/NACK
* @adap: Pointer to struct i2c_algo_pch_data.
*/
@@ -373,6 +341,40 @@ static void pch_i2c_stop(struct i2c_algo_pch_data *adap)
pch_clrbit(adap->pch_base_address, PCH_I2CCTL, PCH_START);
}
+static int pch_i2c_wait_for_check_xfer(struct i2c_algo_pch_data *adap)
+{
+ long ret;
+
+ ret = wait_event_timeout(pch_event,
+ (adap->pch_event_flag != 0), msecs_to_jiffies(1000));
+ if (!ret) {
+ pch_err(adap, "%s:wait-event timeout\n", __func__);
+ adap->pch_event_flag = 0;
+ pch_i2c_stop(adap);
+ pch_i2c_init(adap);
+ return -ETIMEDOUT;
+ }
+
+ if (adap->pch_event_flag & I2C_ERROR_MASK) {
+ pch_err(adap, "Lost Arbitration\n");
+ adap->pch_event_flag = 0;
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
+ pch_i2c_init(adap);
+ return -EAGAIN;
+ }
+
+ adap->pch_event_flag = 0;
+
+ if (pch_i2c_getack(adap)) {
+ pch_dbg(adap, "Receive NACK for slave address"
+ "setting\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
/**
* pch_i2c_repstart() - generate repeated start condition in normal mode
* @adap: Pointer to struct i2c_algo_pch_data.
@@ -427,27 +429,12 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
if (first)
pch_i2c_start(adap);
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- addr_8_lsb = (addr & I2C_ADDR_MSK);
- iowrite32(addr_8_lsb, p + PCH_I2CDR);
- } else if (rtn == -EIO) { /* Arbitration Lost */
- pch_err(adap, "Lost Arbitration\n");
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMAL_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMIF_BIT);
- pch_i2c_init(adap);
- return -EAGAIN;
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
+
+ addr_8_lsb = (addr & I2C_ADDR_MSK);
+ iowrite32(addr_8_lsb, p + PCH_I2CDR);
} else {
/* set 7 bit slave address and R/W bit as 0 */
iowrite32(addr << 1, p + PCH_I2CDR);
@@ -455,44 +442,21 @@ static s32 pch_i2c_writebytes(struct i2c_adapter *i2c_adap,
pch_i2c_start(adap);
}
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- } else if (rtn == -EIO) { /* Arbitration Lost */
- pch_err(adap, "Lost Arbitration\n");
- pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
- pch_i2c_init(adap);
- return -EAGAIN;
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
for (wrcount = 0; wrcount < length; ++wrcount) {
/* write buffer value to I2C data register */
iowrite32(buf[wrcount], p + PCH_I2CDR);
pch_dbg(adap, "writing %x to Data register\n", buf[wrcount]);
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMCF_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMIF_BIT);
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
+
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMCF_BIT);
+ pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
}
/* check if this is the last message */
@@ -580,50 +544,21 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
if (first)
pch_i2c_start(adap);
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- addr_8_lsb = (addr & I2C_ADDR_MSK);
- iowrite32(addr_8_lsb, p + PCH_I2CDR);
- } else if (rtn == -EIO) { /* Arbitration Lost */
- pch_err(adap, "Lost Arbitration\n");
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMAL_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMIF_BIT);
- pch_i2c_init(adap);
- return -EAGAIN;
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
+
+ addr_8_lsb = (addr & I2C_ADDR_MSK);
+ iowrite32(addr_8_lsb, p + PCH_I2CDR);
+
pch_i2c_restart(adap);
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- addr_2_msb |= I2C_RD;
- iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK,
- p + PCH_I2CDR);
- } else if (rtn == -EIO) { /* Arbitration Lost */
- pch_err(adap, "Lost Arbitration\n");
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMAL_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR,
- I2CMIF_BIT);
- pch_i2c_init(adap);
- return -EAGAIN;
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
+
+ addr_2_msb |= I2C_RD;
+ iowrite32(addr_2_msb | TEN_BIT_ADDR_MASK, p + PCH_I2CDR);
} else {
/* 7 address bits + R/W bit */
addr = (((addr) << 1) | (I2C_RD));
@@ -634,23 +569,9 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
if (first)
pch_i2c_start(adap);
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave address"
- "setting\n");
- return -EIO;
- }
- } else if (rtn == -EIO) { /* Arbitration Lost */
- pch_err(adap, "Lost Arbitration\n");
- pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMAL_BIT);
- pch_clrbit(adap->pch_base_address, PCH_I2CSR, I2CMIF_BIT);
- pch_i2c_init(adap);
- return -EAGAIN;
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
if (length == 0) {
pch_i2c_stop(adap);
@@ -669,18 +590,9 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
if (loop != 1)
read_index++;
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave"
- "address setting\n");
- return -EIO;
- }
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
-
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
} /* end for */
pch_i2c_sendnack(adap);
@@ -690,17 +602,9 @@ static s32 pch_i2c_readbytes(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs,
if (length != 1)
read_index++;
- rtn = pch_i2c_wait_for_xfer_complete(adap);
- if (rtn == 0) {
- if (pch_i2c_getack(adap)) {
- pch_dbg(adap, "Receive NACK for slave"
- "address setting\n");
- return -EIO;
- }
- } else { /* wait-event timeout */
- pch_i2c_stop(adap);
- return -ETIME;
- }
+ rtn = pch_i2c_wait_for_check_xfer(adap);
+ if (rtn)
+ return rtn;
if (last)
pch_i2c_stop(adap);
@@ -790,7 +694,7 @@ static s32 pch_i2c_xfer(struct i2c_adapter *i2c_adap,
ret = mutex_lock_interruptible(&pch_mutex);
if (ret)
- return -ERESTARTSYS;
+ return ret;
if (adap->p_adapter_info->pch_i2c_suspended) {
mutex_unlock(&pch_mutex);
@@ -909,7 +813,7 @@ static int __devinit pch_i2c_probe(struct pci_dev *pdev,
pch_adap->owner = THIS_MODULE;
pch_adap->class = I2C_CLASS_HWMON;
- strcpy(pch_adap->name, KBUILD_MODNAME);
+ strlcpy(pch_adap->name, KBUILD_MODNAME, sizeof(pch_adap->name));
pch_adap->algo = &pch_algorithm;
pch_adap->algo_data = &adap_info->pch_data[i];
@@ -963,7 +867,7 @@ static void __devexit pch_i2c_remove(struct pci_dev *pdev)
pci_iounmap(pdev, adap_info->pch_data[0].pch_base_address);
for (i = 0; i < adap_info->ch_num; i++)
- adap_info->pch_data[i].pch_base_address = 0;
+ adap_info->pch_data[i].pch_base_address = NULL;
pci_set_drvdata(pdev, NULL);
@@ -1063,6 +967,6 @@ module_exit(pch_pci_exit);
MODULE_DESCRIPTION("Intel EG20T PCH/LAPIS Semico ML7213/ML7223/ML7831 IOH I2C");
MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Tomoya MORINAGA. <tomoya-linux@dsn.lapis-semi.com>");
+MODULE_AUTHOR("Tomoya MORINAGA. <tomoya.rohm@gmail.com>");
module_param(pch_i2c_speed, int, (S_IRUSR | S_IWUSR));
module_param(pch_clk, int, (S_IRUSR | S_IWUSR));
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-30 15:16:39 +0000