From: jean-jacques hiblot <jjhib...@gmail.com>
* removed unneeded 'volatile' qualifiers and casts
* use the dev_dbg, dev_err etc. instead of printk
* removed unneeded members for the driver's private data
* fixed the style of the multi-line comments
Signed-off-by: jean-jacques hiblot <jjhib...@traphandler.com>
Reviewed-by: Gregory CLEMENT <gregory.clem...@free-electrons.com>
---
drivers/i2c/busses/i2c-ibm_iic.c | 135 +++++++++++++++++++++------------------
drivers/i2c/busses/i2c-ibm_iic.h | 9 +--
2 files changed, 78 insertions(+), 66 deletions(-)
diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index ff3caa0..03ab756 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -68,22 +68,26 @@ MODULE_PARM_DESC(iic_force_fast, "Force fast mode (400
kHz)");
#undef DBG2
#endif
+# define ERR(dev, f, x...) dev_err(dev->adap.dev.parent, f, ##x)
+
#if DBG_LEVEL > 0
-# define DBG(f,x...) printk(KERN_DEBUG "ibm-iic" f, ##x)
+# define DBG(dev, f, x...) dev_dbg(dev->adap.dev.parent, f, ##x)
#else
-# define DBG(f,x...) ((void)0)
+# define DBG(dev, f, x...) ((void)0)
#endif
#if DBG_LEVEL > 1
-# define DBG2(f,x...) DBG(f, ##x)
+# define DBG2(dev, f, x...) DBG(dev, f, ##x)
#else
-# define DBG2(f,x...) ((void)0)
+# define DBG2(dev, f, x...) ((void)0)
#endif
#if DBG_LEVEL > 2
static void dump_iic_regs(const char* header, struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
- printk(KERN_DEBUG "ibm-iic%d: %s\n", dev->idx, header);
- printk(KERN_DEBUG
+ struct iic_regs __iomem *iic = dev->vaddr;
+ struct device *device = dev.adap.dev.parent;
+
+ dev_dbg(device, ": %s\n", header);
+ dev_dbg(device,
" cntl = 0x%02x, mdcntl = 0x%02x\n"
" sts = 0x%02x, extsts = 0x%02x\n"
" clkdiv = 0x%02x, xfrcnt = 0x%02x\n"
@@ -133,9 +137,9 @@ static inline void iic_interrupt_mode(struct
ibm_iic_private* dev, int enable)
*/
static void iic_dev_init(struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
- DBG("%d: init\n", dev->idx);
+ DBG(dev, "init\n");
/* Clear master address */
out_8(&iic->lmadr, 0);
@@ -178,11 +182,11 @@ static void iic_dev_init(struct ibm_iic_private* dev)
*/
static void iic_dev_reset(struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
int i;
u8 dc;
- DBG("%d: soft reset\n", dev->idx);
+ DBG(dev, "soft reset\n");
DUMP_REGS("reset", dev);
/* Place chip in the reset state */
@@ -191,7 +195,7 @@ static void iic_dev_reset(struct ibm_iic_private* dev)
/* Check if bus is free */
dc = in_8(&iic->directcntl);
if (!DIRCTNL_FREE(dc)){
- DBG("%d: trying to regain bus control\n", dev->idx);
+ DBG(dev, "trying to regain bus control\n");
/* Try to set bus free state */
out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
@@ -226,7 +230,7 @@ static void iic_dev_reset(struct ibm_iic_private* dev)
*/
/* Wait for SCL and/or SDA to be high */
-static int iic_dc_wait(volatile struct iic_regs __iomem *iic, u8 mask)
+static int iic_dc_wait(struct iic_regs __iomem *iic, u8 mask)
{
unsigned long x = jiffies + HZ / 28 + 2;
while ((in_8(&iic->directcntl) & mask) != mask){
@@ -239,19 +243,18 @@ static int iic_dc_wait(volatile struct iic_regs __iomem
*iic, u8 mask)
static int iic_smbus_quick(struct ibm_iic_private* dev, const struct i2c_msg*
p)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
const struct i2c_timings* t = &timings[dev->fast_mode ? 1 : 0];
u8 mask, v, sda;
int i, res;
/* Only 7-bit addresses are supported */
if (unlikely(p->flags & I2C_M_TEN)){
- DBG("%d: smbus_quick - 10 bit addresses are not supported\n",
- dev->idx);
+ DBG(dev, "smbus_quick - 10 bit addresses are not supported\n");
return -EINVAL;
}
- DBG("%d: smbus_quick(0x%02x)\n", dev->idx, p->addr);
+ DBG(dev, "smbus_quick(0x%02x)\n", p->addr);
/* Reset IIC interface */
out_8(&iic->xtcntlss, XTCNTLSS_SRST);
@@ -304,7 +307,7 @@ static int iic_smbus_quick(struct ibm_iic_private* dev,
const struct i2c_msg* p)
ndelay(t->buf);
- DBG("%d: smbus_quick -> %s\n", dev->idx, res ? "NACK" : "ACK");
+ DBG(dev, "smbus_quick -> %s\n", res ? "NACK" : "ACK");
out:
/* Remove reset */
out_8(&iic->xtcntlss, 0);
@@ -314,7 +317,7 @@ out:
return res;
err:
- DBG("%d: smbus_quick - bus is stuck\n", dev->idx);
+ DBG(dev, "smbus_quick - bus is stuck\n");
res = -EREMOTEIO;
goto out;
}
@@ -325,10 +328,10 @@ err:
static irqreturn_t iic_handler(int irq, void *dev_id)
{
struct ibm_iic_private* dev = (struct ibm_iic_private*)dev_id;
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
- DBG2("%d: irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
- dev->idx, in_8(&iic->sts), in_8(&iic->extsts));
+ DBG2(dev, "irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
+ in_8(&iic->sts), in_8(&iic->extsts));
/* Acknowledge IRQ and wakeup iic_wait_for_tc */
out_8(&iic->sts, STS_IRQA | STS_SCMP);
@@ -343,10 +346,10 @@ static irqreturn_t iic_handler(int irq, void *dev_id)
*/
static int iic_xfer_result(struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
if (unlikely(in_8(&iic->sts) & STS_ERR)){
- DBG("%d: xfer error, EXTSTS = 0x%02x\n", dev->idx,
+ DBG(dev, "xfer error, EXTSTS = 0x%02x\n",
in_8(&iic->extsts));
/* Clear errors and possible pending IRQs */
@@ -356,13 +359,14 @@ static int iic_xfer_result(struct ibm_iic_private* dev)
/* Flush master data buffer */
out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB);
- /* Is bus free?
+ /*
+ * Is bus free?
* If error happened during combined xfer
* IIC interface is usually stuck in some strange
* state, the only way out - soft reset.
*/
if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
- DBG("%d: bus is stuck, resetting\n", dev->idx);
+ DBG(dev, "bus is stuck, resetting\n");
iic_dev_reset(dev);
}
return -EREMOTEIO;
@@ -376,10 +380,10 @@ static int iic_xfer_result(struct ibm_iic_private* dev)
*/
static void iic_abort_xfer(struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
unsigned long x;
- DBG("%d: iic_abort_xfer\n", dev->idx);
+ DBG(dev, "iic_abort_xfer\n");
out_8(&iic->cntl, CNTL_HMT);
@@ -390,7 +394,7 @@ static void iic_abort_xfer(struct ibm_iic_private* dev)
x = jiffies + 2;
while ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
if (time_after(jiffies, x)){
- DBG("%d: abort timeout, resetting...\n", dev->idx);
+ DBG(dev, "abort timeout, resetting...\n");
iic_dev_reset(dev);
return;
}
@@ -408,7 +412,7 @@ static void iic_abort_xfer(struct ibm_iic_private* dev)
*/
static int iic_wait_for_tc(struct ibm_iic_private* dev){
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
int ret = 0;
if (dev->irq >= 0){
@@ -417,9 +421,9 @@ static int iic_wait_for_tc(struct ibm_iic_private* dev){
!(in_8(&iic->sts) & STS_PT), dev->adap.timeout);
if (unlikely(ret < 0))
- DBG("%d: wait interrupted\n", dev->idx);
+ DBG(dev, "wait interrupted\n");
else if (unlikely(in_8(&iic->sts) & STS_PT)){
- DBG("%d: wait timeout\n", dev->idx);
+ DBG(dev, "wait timeout\n");
ret = -ETIMEDOUT;
}
}
@@ -429,13 +433,13 @@ static int iic_wait_for_tc(struct ibm_iic_private* dev){
while (in_8(&iic->sts) & STS_PT){
if (unlikely(time_after(jiffies, x))){
- DBG("%d: poll timeout\n", dev->idx);
+ DBG(dev, "poll timeout\n");
ret = -ETIMEDOUT;
break;
}
if (unlikely(signal_pending(current))){
- DBG("%d: poll interrupted\n", dev->idx);
+ DBG(dev, "poll interrupted\n");
ret = -ERESTARTSYS;
break;
}
@@ -448,7 +452,7 @@ static int iic_wait_for_tc(struct ibm_iic_private* dev){
else
ret = iic_xfer_result(dev);
- DBG2("%d: iic_wait_for_tc -> %d\n", dev->idx, ret);
+ DBG2(dev, "iic_wait_for_tc -> %d\n", ret);
return ret;
}
@@ -459,7 +463,7 @@ static int iic_wait_for_tc(struct ibm_iic_private* dev){
static int iic_xfer_bytes(struct ibm_iic_private* dev, struct i2c_msg* pm,
int combined_xfer)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
char* buf = pm->buf;
int i, j, loops, ret = 0;
int len = pm->len;
@@ -475,14 +479,14 @@ static int iic_xfer_bytes(struct ibm_iic_private* dev,
struct i2c_msg* pm,
if (!(cntl & CNTL_RW))
for (j = 0; j < count; ++j)
- out_8((void __iomem *)&iic->mdbuf, *buf++);
+ out_8(&iic->mdbuf, *buf++);
if (i < loops - 1)
cmd |= CNTL_CHT;
else if (combined_xfer)
cmd |= CNTL_RPST;
- DBG2("%d: xfer_bytes, %d, CNTL = 0x%02x\n", dev->idx, count,
cmd);
+ DBG2(dev, "xfer_bytes, %d, CNTL = 0x%02x\n", count, cmd);
/* Start transfer */
out_8(&iic->cntl, cmd);
@@ -493,8 +497,8 @@ static int iic_xfer_bytes(struct ibm_iic_private* dev,
struct i2c_msg* pm,
if (unlikely(ret < 0))
break;
else if (unlikely(ret != count)){
- DBG("%d: xfer_bytes, requested %d, transferred %d\n",
- dev->idx, count, ret);
+ DBG(dev, "xfer_bytes, requested %d, transferred %d\n",
+ count, ret);
/* If it's not a last part of xfer, abort it */
if (combined_xfer || (i < loops - 1))
@@ -506,7 +510,7 @@ static int iic_xfer_bytes(struct ibm_iic_private* dev,
struct i2c_msg* pm,
if (cntl & CNTL_RW)
for (j = 0; j < count; ++j)
- *buf++ = in_8((void __iomem *)&iic->mdbuf);
+ *buf++ = in_8(&iic->mdbuf);
}
return ret > 0 ? 0 : ret;
@@ -517,10 +521,10 @@ static int iic_xfer_bytes(struct ibm_iic_private* dev,
struct i2c_msg* pm,
*/
static inline void iic_address(struct ibm_iic_private* dev, struct i2c_msg*
msg)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
u16 addr = msg->addr;
- DBG2("%d: iic_address, 0x%03x (%d-bit)\n", dev->idx,
+ DBG2(dev, "iic_address, 0x%03x (%d-bit)\n",
addr, msg->flags & I2C_M_TEN ? 10 : 7);
if (msg->flags & I2C_M_TEN){
@@ -553,46 +557,49 @@ static inline int iic_address_neq(const struct i2c_msg*
p1,
static int iic_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
{
struct ibm_iic_private* dev = (struct
ibm_iic_private*)(i2c_get_adapdata(adap));
- volatile struct iic_regs __iomem *iic = dev->vaddr;
+ struct iic_regs __iomem *iic = dev->vaddr;
int i, ret = 0;
- DBG2("%d: iic_xfer, %d msg(s)\n", dev->idx, num);
+ DBG2(dev, "iic_xfer, %d msg(s)\n", num);
if (!num)
return 0;
- /* Check the sanity of the passed messages.
+ /*
+ * Check the sanity of the passed messages.
* Uhh, generic i2c layer is more suitable place for such code...
*/
if (unlikely(iic_invalid_address(&msgs[0]))){
- DBG("%d: invalid address 0x%03x (%d-bit)\n", dev->idx,
+ DBG(dev, "invalid address 0x%03x (%d-bit)\n",
msgs[0].addr, msgs[0].flags & I2C_M_TEN ? 10 : 7);
return -EINVAL;
}
for (i = 0; i < num; ++i){
if (unlikely(msgs[i].len <= 0)){
if (num == 1 && !msgs[0].len){
- /* Special case for I2C_SMBUS_QUICK emulation.
+ /*
+ * Special case for I2C_SMBUS_QUICK emulation.
* IBM IIC doesn't support 0-length transactions
* so we have to emulate them using bit-banging.
*/
return iic_smbus_quick(dev, &msgs[0]);
}
- DBG("%d: invalid len %d in msg[%d]\n", dev->idx,
+ DBG(dev, "invalid len %d in msg[%d]\n",
msgs[i].len, i);
return -EINVAL;
}
if (unlikely(iic_address_neq(&msgs[0], &msgs[i]))){
- DBG("%d: invalid addr in msg[%d]\n", dev->idx, i);
+ DBG(dev, "invalid addr in msg[%d]\n", i);
return -EINVAL;
}
}
/* Check bus state */
if (unlikely((in_8(&iic->extsts) & EXTSTS_BCS_MASK) !=
EXTSTS_BCS_FREE)){
- DBG("%d: iic_xfer, bus is not free\n", dev->idx);
+ DBG(dev, "iic_xfer, bus is not free\n");
- /* Usually it means something serious has happened.
+ /*
+ * Usually it means something serious has happened.
* We *cannot* have unfinished previous transfer
* so it doesn't make any sense to try to stop it.
* Probably we were not able to recover from the
@@ -603,7 +610,7 @@ static int iic_xfer(struct i2c_adapter *adap, struct
i2c_msg *msgs, int num)
iic_dev_reset(dev);
if ((in_8(&iic->extsts) & EXTSTS_BCS_MASK) != EXTSTS_BCS_FREE){
- DBG("%d: iic_xfer, bus is still not free\n", dev->idx);
+ DBG(dev, "iic_xfer, bus is still not free\n");
return -EREMOTEIO;
}
}
@@ -635,15 +642,18 @@ static const struct i2c_algorithm iic_algo = {
/*
* Calculates IICx_CLCKDIV value for a specific OPB clock frequency
*/
-static inline u8 iic_clckdiv(unsigned int opb)
+static inline u8 iic_clckdiv(struct ibm_iic_private *dev, unsigned int opb)
{
- /* Compatibility kludge, should go away after all cards
+ struct device *device = dev->adap.dev.parent;
+
+ /*
+ * Compatibility kludge, should go away after all cards
* are fixed to fill correct value for opbfreq.
* Previous driver version used hardcoded divider value 4,
* it corresponds to OPB frequency from the range (40, 50] MHz
*/
if (!opb){
- printk(KERN_WARNING "ibm-iic: using compatibility value for OPB
freq,"
+ dev_warn(device, "iic_clckdiv: using compatibility value for
OPB freq,"
" fix your board specific setup\n");
opb = 50000000;
}
@@ -652,7 +662,7 @@ static inline u8 iic_clckdiv(unsigned int opb)
opb /= 1000000;
if (opb < 20 || opb > 150){
- printk(KERN_WARNING "ibm-iic: invalid OPB clock frequency %u
MHz\n",
+ dev_warn(device, "iic_clckdiv: invalid OPB clock frequency %u
MHz\n",
opb);
opb = opb < 20 ? 20 : 150;
}
@@ -670,16 +680,17 @@ static int iic_request_irq(struct platform_device *ofdev,
irq = irq_of_parse_and_map(np, 0);
if (!irq) {
- dev_err(&ofdev->dev, "irq_of_parse_and_map failed\n");
+ ERR(dev, "irq_of_parse_and_map failed\n");
return 0;
}
- /* Disable interrupts until we finish initialization, assumes
+ /*
+ * Disable interrupts until we finish initialization, assumes
* level-sensitive IRQ setup...
*/
iic_interrupt_mode(dev, 0);
if (request_irq(irq, iic_handler, 0, "IBM IIC", dev)) {
- dev_err(&ofdev->dev, "request_irq %d failed\n", irq);
+ ERR(dev, "request_irq %d failed\n", irq);
/* Fallback to the polling mode */
return 0;
}
@@ -717,7 +728,7 @@ static int iic_probe(struct platform_device *ofdev)
dev->irq = iic_request_irq(ofdev, dev);
if (!dev->irq)
- dev_warn(&ofdev->dev, "using polling mode\n");
+ dev_info(&ofdev->dev, "using polling mode\n");
/* Board specific settings */
if (iic_force_fast || of_get_property(np, "fast-mode", NULL))
@@ -733,7 +744,7 @@ static int iic_probe(struct platform_device *ofdev)
}
}
- dev->clckdiv = iic_clckdiv(*freq);
+ dev->clckdiv = iic_clckdiv(dev, *freq);
dev_dbg(&ofdev->dev, "clckdiv = %d\n", dev->clckdiv);
/* Initialize IIC interface */
diff --git a/drivers/i2c/busses/i2c-ibm_iic.h b/drivers/i2c/busses/i2c-ibm_iic.h
index fdaa482..1efce5d 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.h
+++ b/drivers/i2c/busses/i2c-ibm_iic.h
@@ -25,8 +25,10 @@
#include <linux/i2c.h>
struct iic_regs {
- u16 mdbuf;
- u16 sbbuf;
+ u8 mdbuf;
+ u8 reserved1;
+ u8 sbbuf;
+ u8 reserved2;
u8 lmadr;
u8 hmadr;
u8 cntl;
@@ -44,9 +46,8 @@ struct iic_regs {
struct ibm_iic_private {
struct i2c_adapter adap;
- volatile struct iic_regs __iomem *vaddr;
+ struct iic_regs __iomem *vaddr;
wait_queue_head_t wq;
- int idx;
int irq;
int fast_mode;
u8 clckdiv;
--
1.8.4.2
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