/* Transfer date to/from uC Program RAM of IB or PCIe SerDes */
static int ipath_sd7220_ram_xfer(struct ipath_devdata *dd, int sdnum, u32 loc,
u8 *buf, int cnt, int rd_notwr)
{
u16 trans;
u64 transval;
u64 csbit;
int owned;
int tries;
int sofar;
int addr;
int ret;
unsigned long flags;
const char *op;
/* Pick appropriate transaction reg and "Chip select" for this serdes */
switch (sdnum) {
case IB_7220_SERDES :
csbit = 1ULL << EPB_IB_UC_CS_SHF;
trans = dd->ipath_kregs->kr_ib_epbtrans;
break;
case PCIE_SERDES0 :
case PCIE_SERDES1 :
/* PCIe SERDES has uC "chip select" in different bit, too */
csbit = 1ULL << EPB_PCIE_UC_CS_SHF;
trans = dd->ipath_kregs->kr_pcie_epbtrans;
break;
default :
return -1;
}
op = rd_notwr ? "Rd" : "Wr";
spin_lock_irqsave(&dd->ipath_sdepb_lock, flags);
owned = epb_access(dd, sdnum, 1);
if (owned < 0) {
spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
ipath_dbg("Could not get %s access to %s EPB: %X, loc %X\n",
op, (sdnum == IB_7220_SERDES) ? "IB" : "PCIe",
owned, loc);
return -1;
}
/*
* In future code, we may need to distinguish several address ranges,
* and select various memories based on this. For now, just trim
* "loc" (location including address and memory select) to
* "addr" (address within memory). we will only support PRAM
* The memory is 8KB.
*/
addr = loc & 0x1FFF;
for (tries = EPB_TRANS_TRIES; tries; --tries) {
transval = ipath_read_kreg32(dd, trans);
if (transval & EPB_TRANS_RDY)
break;
udelay(5);
}
sofar = 0;
if (tries <= 0)
ipath_dbg("No initial RDY on EPB access request\n");
else {
/*
* Every "memory" access is doubly-indirect.
* We set two bytes of address, then read/write
* one or mores bytes of data.
*/
/* First, we set control to "Read" or "Write" */
transval = csbit | EPB_UC_CTL |
(rd_notwr ? EPB_ROM_R : EPB_ROM_W);
tries = epb_trans(dd, trans, transval, &transval);
if (tries <= 0)
ipath_dbg("No EPB response to uC %s cmd\n", op);
while (tries > 0 && sofar < cnt) {
if (!sofar) {
/* Only set address at start of chunk */
int addrbyte = (addr + sofar) >> 8;
transval = csbit | EPB_MADDRH | addrbyte;
tries = epb_trans(dd, trans, transval,
&transval);
if (tries <= 0) {
ipath_dbg("No EPB response ADDRH\n");
break;
}
addrbyte = (addr + sofar) & 0xFF;
transval = csbit | EPB_MADDRL | addrbyte;
tries = epb_trans(dd, trans, transval,
&transval);
if (tries <= 0) {
ipath_dbg("No EPB response ADDRL\n");
break;
}
}
if (rd_notwr)
transval = csbit | EPB_ROMDATA | EPB_RD;
else
transval = csbit | EPB_ROMDATA | buf[sofar];
tries = epb_trans(dd, trans, transval, &transval);
if (tries <= 0) {
ipath_dbg("No EPB response DATA\n");
break;
}
if (rd_notwr)
buf[sofar] = transval & EPB_DATA_MASK;
++sofar;
}
/* Finally, clear control-bit for Read or Write */
transval = csbit | EPB_UC_CTL;
tries = epb_trans(dd, trans, transval, &transval);
if (tries <= 0)
ipath_dbg("No EPB response to drop of uC %s cmd\n", op);
}
/**
*
* ipath_sd7220_reg_mod - modify SERDES register
* @dd: the infinipath device
* @sdnum: which SERDES to access
* @loc: location - channel, element, register, as packed by EPB_LOC() macro.
* @wd: Write Data - value to set in register
* @mask: ones where data should be spliced into reg.
*
* Basic register read/modify/write, with un-needed accesses elided. That is,
* a mask of zero will prevent write, while a mask of 0xFF will prevent read.
* returns current (presumed, if a write was done) contents of selected
* register, or <0 if errors.
*/
static int ipath_sd7220_reg_mod(struct ipath_devdata *dd, int sdnum, u32 loc,
u32 wd, u32 mask)
{
u16 trans;
u64 transval;
int owned;
int tries, ret;
unsigned long flags;
switch (sdnum) {
case IB_7220_SERDES :
trans = dd->ipath_kregs->kr_ib_epbtrans;
break;
case PCIE_SERDES0 :
case PCIE_SERDES1 :
trans = dd->ipath_kregs->kr_pcie_epbtrans;
break;
default :
return -1;
}
/*
* All access is locked in software (vs other host threads) and
* hardware (vs uC access).
*/
spin_lock_irqsave(&dd->ipath_sdepb_lock, flags);
owned = epb_access(dd, sdnum, 1);
if (owned < 0) {
spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
return -1;
}
ret = 0;
for (tries = EPB_TRANS_TRIES; tries; --tries) {
transval = ipath_read_kreg32(dd, trans);
if (transval & EPB_TRANS_RDY)
break;
udelay(5);
}
if (tries > 0) {
tries = 1; /* to make read-skip work */
if (mask != 0xFF) {
/*
* Not a pure write, so need to read.
* loc encodes chip-select as well as address
*/
transval = loc | EPB_RD;
tries = epb_trans(dd, trans, transval, &transval);
}
if (tries > 0 && mask != 0) {
/*
* Not a pure read, so need to write.
*/
wd = (wd & mask) | (transval & ~mask);
transval = loc | (wd & EPB_DATA_MASK);
tries = epb_trans(dd, trans, transval, &transval);
}
}
/* else, failed to see ready, what error-handling? */
/*
* Release bus. Failure is an error.
*/
if (epb_access(dd, sdnum, -1) < 0)
ret = -1;
else
ret = transval & EPB_DATA_MASK;
spin_unlock_irqrestore(&dd->ipath_sdepb_lock, flags);
if (tries <= 0)
ret = -1;
return ret;
}
static int qib_sd7220_ram_xfer(struct qib_devdata *dd, int sdnum, u32 loc,
u8 *buf, int cnt, int rd_notwr)
{
u16 trans;
u64 transval;
u64 csbit;
int owned;
int tries;
int sofar;
int addr;
int ret;
unsigned long flags;
const char *op;
switch (sdnum) {
case IB_7220_SERDES:
csbit = 1ULL << EPB_IB_UC_CS_SHF;
trans = kr_ibsd_epb_transaction_reg;
break;
case PCIE_SERDES0:
case PCIE_SERDES1:
csbit = 1ULL << EPB_PCIE_UC_CS_SHF;
trans = kr_pciesd_epb_transaction_reg;
break;
default:
return -1;
}
op = rd_notwr ? "Rd" : "Wr";
spin_lock_irqsave(&dd->cspec->sdepb_lock, flags);
owned = epb_access(dd, sdnum, 1);
if (owned < 0) {
spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags);
return -1;
}
addr = loc & 0x1FFF;
for (tries = EPB_TRANS_TRIES; tries; --tries) {
transval = qib_read_kreg32(dd, trans);
if (transval & EPB_TRANS_RDY)
break;
udelay(5);
}
sofar = 0;
if (tries > 0) {
transval = csbit | EPB_UC_CTL |
(rd_notwr ? EPB_ROM_R : EPB_ROM_W);
tries = epb_trans(dd, trans, transval, &transval);
while (tries > 0 && sofar < cnt) {
if (!sofar) {
int addrbyte = (addr + sofar) >> 8;
transval = csbit | EPB_MADDRH | addrbyte;
tries = epb_trans(dd, trans, transval,
&transval);
if (tries <= 0)
break;
addrbyte = (addr + sofar) & 0xFF;
transval = csbit | EPB_MADDRL | addrbyte;
tries = epb_trans(dd, trans, transval,
&transval);
if (tries <= 0)
break;
}
if (rd_notwr)
transval = csbit | EPB_ROMDATA | EPB_RD;
else
transval = csbit | EPB_ROMDATA | buf[sofar];
tries = epb_trans(dd, trans, transval, &transval);
if (tries <= 0)
break;
if (rd_notwr)
buf[sofar] = transval & EPB_DATA_MASK;
++sofar;
}
} if (rd_notwr) transval = csbit | EPB_ROMDATA | EPB_RD; else transval = csbit | EPB_ROMDATA | buf[sofar]; tries = epb_trans(dd, trans, transval, &transval); if (tries <= 0) break; if (rd_notwr) buf[sofar] = transval & EPB_DATA_MASK; ++sofar; } /* Finally, clear control-bit for Read or Write */ transval = csbit | EPB_UC_CTL; tries = epb_trans(dd, trans, transval, &transval); } ret = sofar; /* Release bus. Failure is an error */ if (epb_access(dd, sdnum, -1) < 0) ret = -1; spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags); if (tries <= 0) ret = -1; return ret; } #define PROG_CHUNK 64
static int qib_sd7220_reg_mod(struct qib_devdata *dd, int sdnum, u32 loc,
u32 wd, u32 mask)
{
u16 trans;
u64 transval;
int owned;
int tries, ret;
unsigned long flags;
switch (sdnum) {
case IB_7220_SERDES:
trans = kr_ibsd_epb_transaction_reg;
break;
case PCIE_SERDES0:
case PCIE_SERDES1:
trans = kr_pciesd_epb_transaction_reg;
break;
default:
return -1;
}
spin_lock_irqsave(&dd->cspec->sdepb_lock, flags);
owned = epb_access(dd, sdnum, 1);
if (owned < 0) {
spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags);
return -1;
}
ret = 0;
for (tries = EPB_TRANS_TRIES; tries; --tries) {
transval = qib_read_kreg32(dd, trans);
if (transval & EPB_TRANS_RDY)
break;
udelay(5);
}
if (tries > 0) {
tries = 1;
if (mask != 0xFF) {
transval = loc | EPB_RD;
tries = epb_trans(dd, trans, transval, &transval);
}
if (tries > 0 && mask != 0) {
wd = (wd & mask) | (transval & ~mask);
transval = loc | (wd & EPB_DATA_MASK);
tries = epb_trans(dd, trans, transval, &transval);
}
}
if (epb_access(dd, sdnum, -1) < 0)
ret = -1;
else
ret = transval & EPB_DATA_MASK;
spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags);
if (tries <= 0)
ret = -1;
return ret;
}