* Copyright (c) 2003, 2004 Zultys Technologies.
* Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
*
- * Based on original work by
+ * Based on original work by
* Ian DaSilva <idasilva@mvista.com>
* Armin Kuster <akuster@mvista.com>
* Matt Porter <mporter@mvista.com>
KERN_DEBUG " sts = 0x%02x, extsts = 0x%02x\n"
KERN_DEBUG " clkdiv = 0x%02x, xfrcnt = 0x%02x\n"
KERN_DEBUG " xtcntlss = 0x%02x, directcntl = 0x%02x\n",
- in_8(&iic->cntl), in_8(&iic->mdcntl), in_8(&iic->sts),
- in_8(&iic->extsts), in_8(&iic->clkdiv), in_8(&iic->xfrcnt),
+ in_8(&iic->cntl), in_8(&iic->mdcntl), in_8(&iic->sts),
+ in_8(&iic->extsts), in_8(&iic->clkdiv), in_8(&iic->xfrcnt),
in_8(&iic->xtcntlss), in_8(&iic->directcntl));
}
# define DUMP_REGS(h,dev) dump_iic_regs((h),(dev))
{
out_8(&dev->vaddr->intmsk, enable ? INTRMSK_EIMTC : 0);
}
-
+
/*
* Initialize IIC interface.
*/
volatile struct iic_regs __iomem *iic = dev->vaddr;
DBG("%d: init\n", dev->idx);
-
+
/* Clear master address */
out_8(&iic->lmadr, 0);
out_8(&iic->hmadr, 0);
/* Clear control register */
out_8(&iic->cntl, 0);
-
+
/* Enable interrupts if possible */
iic_interrupt_mode(dev, dev->irq >= 0);
DUMP_REGS("iic_init", dev);
}
-/*
+/*
* Reset IIC interface
*/
static void iic_dev_reset(struct ibm_iic_private* dev)
volatile struct iic_regs __iomem *iic = dev->vaddr;
int i;
u8 dc;
-
+
DBG("%d: soft reset\n", dev->idx);
DUMP_REGS("reset", dev);
-
+
/* Place chip in the reset state */
out_8(&iic->xtcntlss, XTCNTLSS_SRST);
-
+
/* Check if bus is free */
- dc = in_8(&iic->directcntl);
+ dc = in_8(&iic->directcntl);
if (!DIRCTNL_FREE(dc)){
DBG("%d: trying to regain bus control\n", dev->idx);
-
+
/* Try to set bus free state */
- out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
-
+ out_8(&iic->directcntl, DIRCNTL_SDAC | DIRCNTL_SCC);
+
/* Wait until we regain bus control */
for (i = 0; i < 100; ++i){
dc = in_8(&iic->directcntl);
if (DIRCTNL_FREE(dc))
break;
-
+
/* Toggle SCL line */
dc ^= DIRCNTL_SCC;
out_8(&iic->directcntl, dc);
udelay(10);
dc ^= DIRCNTL_SCC;
out_8(&iic->directcntl, dc);
-
+
/* be nice */
cond_resched();
}
}
-
+
/* Remove reset */
out_8(&iic->xtcntlss, 0);
-
+
/* Reinitialize interface */
iic_dev_init(dev);
}
{
struct ibm_iic_private* dev = (struct ibm_iic_private*)dev_id;
volatile struct iic_regs __iomem *iic = dev->vaddr;
-
- DBG2("%d: irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
+
+ DBG2("%d: irq handler, STS = 0x%02x, EXTSTS = 0x%02x\n",
dev->idx, in_8(&iic->sts), in_8(&iic->extsts));
-
+
/* Acknowledge IRQ and wakeup iic_wait_for_tc */
out_8(&iic->sts, STS_IRQA | STS_SCMP);
wake_up_interruptible(&dev->wq);
-
+
return IRQ_HANDLED;
}
*/
static int iic_xfer_result(struct ibm_iic_private* dev)
{
- volatile struct iic_regs __iomem *iic = dev->vaddr;
-
+ volatile 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("%d: xfer error, EXTSTS = 0x%02x\n", dev->idx,
in_8(&iic->extsts));
-
+
/* Clear errors and possible pending IRQs */
- out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD |
+ out_8(&iic->extsts, EXTSTS_IRQP | EXTSTS_IRQD |
EXTSTS_LA | EXTSTS_ICT | EXTSTS_XFRA);
-
+
/* Flush master data buffer */
out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB);
-
+
/* Is bus free?
* If error happened during combined xfer
* IIC interface is usually stuck in some strange
{
volatile struct iic_regs __iomem *iic = dev->vaddr;
unsigned long x;
-
+
DBG("%d: iic_abort_xfer\n", dev->idx);
-
+
out_8(&iic->cntl, CNTL_HMT);
-
+
/*
* Wait for the abort command to complete.
* It's not worth to be optimized, just poll (timeout >= 1 tick)
* Returns the number of transferred bytes or error (<0)
*/
static int iic_wait_for_tc(struct ibm_iic_private* dev){
-
+
volatile struct iic_regs __iomem *iic = dev->vaddr;
int ret = 0;
-
+
if (dev->irq >= 0){
/* Interrupt mode */
- ret = wait_event_interruptible_timeout(dev->wq,
+ ret = wait_event_interruptible_timeout(dev->wq,
!(in_8(&iic->sts) & STS_PT), dev->adap.timeout * HZ);
if (unlikely(ret < 0))
else {
/* Polling mode */
unsigned long x = jiffies + dev->adap.timeout * HZ;
-
+
while (in_8(&iic->sts) & STS_PT){
if (unlikely(time_after(jiffies, x))){
DBG("%d: poll timeout\n", dev->idx);
ret = -ETIMEDOUT;
break;
}
-
+
if (unlikely(signal_pending(current))){
DBG("%d: poll interrupted\n", dev->idx);
ret = -ERESTARTSYS;
break;
}
schedule();
- }
+ }
}
-
+
if (unlikely(ret < 0))
iic_abort_xfer(dev);
else
ret = iic_xfer_result(dev);
-
+
DBG2("%d: iic_wait_for_tc -> %d\n", dev->idx, ret);
-
+
return ret;
}
/*
* Low level master transfer routine
*/
-static int iic_xfer_bytes(struct ibm_iic_private* dev, struct i2c_msg* pm,
+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;
u8 cntl = (in_8(&iic->cntl) & CNTL_AMD) | CNTL_PT;
if (pm->flags & I2C_M_RD)
cntl |= CNTL_RW;
-
+
loops = (len + 3) / 4;
for (i = 0; i < loops; ++i, len -= 4){
int count = len > 4 ? 4 : len;
u8 cmd = cntl | ((count - 1) << CNTL_TCT_SHIFT);
-
+
if (!(cntl & CNTL_RW))
for (j = 0; j < count; ++j)
out_8((void __iomem *)&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);
-
+
/* Start transfer */
out_8(&iic->cntl, cmd);
-
+
/* Wait for completion */
ret = iic_wait_for_tc(dev);
if (unlikely(ret < 0))
break;
else if (unlikely(ret != count)){
- DBG("%d: xfer_bytes, requested %d, transfered %d\n",
+ DBG("%d: xfer_bytes, requested %d, transfered %d\n",
dev->idx, count, ret);
-
+
/* If it's not a last part of xfer, abort it */
if (combined_xfer || (i < loops - 1))
iic_abort_xfer(dev);
-
+
ret = -EREMOTEIO;
- break;
+ break;
}
-
+
if (cntl & CNTL_RW)
for (j = 0; j < count; ++j)
*buf++ = in_8((void __iomem *)&iic->mdbuf);
}
-
+
return ret > 0 ? 0 : ret;
}
{
volatile struct iic_regs __iomem *iic = dev->vaddr;
u16 addr = msg->addr;
-
- DBG2("%d: iic_address, 0x%03x (%d-bit)\n", dev->idx,
+
+ DBG2("%d: iic_address, 0x%03x (%d-bit)\n", dev->idx,
addr, msg->flags & I2C_M_TEN ? 10 : 7);
-
+
if (msg->flags & I2C_M_TEN){
out_8(&iic->cntl, CNTL_AMD);
out_8(&iic->lmadr, addr);
return (p->addr > 0x3ff) || (!(p->flags & I2C_M_TEN) && (p->addr > 0x7f));
}
-static inline int iic_address_neq(const struct i2c_msg* p1,
+static inline int iic_address_neq(const struct i2c_msg* p1,
const struct i2c_msg* p2)
{
- return (p1->addr != p2->addr)
+ return (p1->addr != p2->addr)
|| ((p1->flags & I2C_M_TEN) != (p2->flags & I2C_M_TEN));
-}
+}
/*
- * Generic master transfer entrypoint.
+ * Generic master transfer entrypoint.
* Returns the number of processed messages or error (<0)
*/
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;
int i, ret = 0;
-
+
DBG2("%d: iic_xfer, %d msg(s)\n", dev->idx, num);
-
+
if (!num)
return 0;
-
+
/* 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("%d: invalid address 0x%03x (%d-bit)\n", dev->idx,
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){
*/
return iic_smbus_quick(dev, &msgs[0]);
}
- DBG("%d: invalid len %d in msg[%d]\n", dev->idx,
+ DBG("%d: invalid len %d in msg[%d]\n", dev->idx,
msgs[i].len, i);
return -EINVAL;
}
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);
-
+
/* Usually it means something serious has happend.
* 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
+ * Probably we were not able to recover from the
* previous error.
* The only *reasonable* thing I can think of here
* is soft reset. --ebs
*/
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);
return -EREMOTEIO;
}
- }
+ }
else {
/* Flush master data buffer (just in case) */
out_8(&iic->mdcntl, in_8(&iic->mdcntl) | MDCNTL_FMDB);
}
-
+
/* Load slave address */
iic_address(dev, &msgs[0]);
-
+
/* Do real transfer */
for (i = 0; i < num && !ret; ++i)
ret = iic_xfer_bytes(dev, &msgs[i], i < num - 1);
/* Convert to MHz */
opb /= 1000000;
-
+
if (opb < 20 || opb > 150){
printk(KERN_CRIT "ibm-iic: invalid OPB clock frequency %u MHz\n",
opb);
struct i2c_adapter* adap;
struct ocp_func_iic_data* iic_data = ocp->def->additions;
int ret;
-
+
if (!iic_data)
printk(KERN_WARNING"ibm-iic%d: missing additional data!\n",
ocp->def->index);
dev->idx = ocp->def->index;
ocp_set_drvdata(ocp, dev);
-
+
if (!request_mem_region(ocp->def->paddr, sizeof(struct iic_regs),
"ibm_iic")) {
ret = -EBUSY;
ret = -ENXIO;
goto fail2;
}
-
+
init_waitqueue_head(&dev->wq);
dev->irq = iic_force_poll ? -1 : ocp->def->irq;
*/
iic_interrupt_mode(dev, 0);
if (request_irq(dev->irq, iic_handler, 0, "IBM IIC", dev)){
- printk(KERN_ERR "ibm-iic%d: request_irq %d failed\n",
+ printk(KERN_ERR "ibm-iic%d: request_irq %d failed\n",
dev->idx, dev->irq);
- /* Fallback to the polling mode */
+ /* Fallback to the polling mode */
dev->irq = -1;
}
}
-
+
if (dev->irq < 0)
- printk(KERN_WARNING "ibm-iic%d: using polling mode\n",
+ printk(KERN_WARNING "ibm-iic%d: using polling mode\n",
dev->idx);
-
+
/* Board specific settings */
dev->fast_mode = iic_force_fast ? 1 : (iic_data ? iic_data->fast_mode : 0);
-
- /* clckdiv is the same for *all* IIC interfaces,
+
+ /* clckdiv is the same for *all* IIC interfaces,
* but I'd rather make a copy than introduce another global. --ebs
*/
dev->clckdiv = iic_clckdiv(ocp_sys_info.opb_bus_freq);
DBG("%d: clckdiv = %d\n", dev->idx, dev->clckdiv);
-
+
/* Initialize IIC interface */
iic_dev_init(dev);
-
+
/* Register it with i2c layer */
adap = &dev->adap;
adap->dev.parent = &ocp->dev;
dev->idx);
goto fail;
}
-
+
printk(KERN_INFO "ibm-iic%d: using %s mode\n", dev->idx,
dev->fast_mode ? "fast (400 kHz)" : "standard (100 kHz)");
return 0;
-fail:
+fail:
if (dev->irq >= 0){
iic_interrupt_mode(dev, 0);
free_irq(dev->irq, dev);
- }
+ }
iounmap(dev->vaddr);
-fail2:
+fail2:
release_mem_region(ocp->def->paddr, sizeof(struct iic_regs));
fail1:
ocp_set_drvdata(ocp, NULL);
- kfree(dev);
+ kfree(dev);
return ret;
}
dev->idx);
/* That's *very* bad, just shutdown IRQ ... */
if (dev->irq >= 0){
- iic_interrupt_mode(dev, 0);
+ iic_interrupt_mode(dev, 0);
free_irq(dev->irq, dev);
dev->irq = -1;
}
} else {
if (dev->irq >= 0){
- iic_interrupt_mode(dev, 0);
+ iic_interrupt_mode(dev, 0);
free_irq(dev->irq, dev);
}
iounmap(dev->vaddr);
}
}
-static struct ocp_device_id ibm_iic_ids[] __devinitdata =
+static struct ocp_device_id ibm_iic_ids[] __devinitdata =
{
{ .vendor = OCP_VENDOR_IBM, .function = OCP_FUNC_IIC },
{ .vendor = OCP_VENDOR_INVALID }
projects / kernel / kernel-generic.git / commitdiff