static int epb_access(struct qib_devdata *dd, int sdnum, int claim)
{
u16 acc;
u64 accval;
int owned = 0;
u64 oct_sel = 0;
switch (sdnum) {
case IB_7220_SERDES:
acc = kr_ibsd_epb_access_ctrl;
break;
case PCIE_SERDES0:
case PCIE_SERDES1:
acc = kr_pciesd_epb_access_ctrl;
oct_sel = (2 << (sdnum - PCIE_SERDES0));
break;
default:
return 0;
}
qib_read_kreg32(dd, kr_scratch);
udelay(15);
accval = qib_read_kreg32(dd, acc);
owned = !!(accval & EPB_ACC_GNT);
if (claim < 0) {
u64 pollval;
u64 newval = 0;
qib_write_kreg(dd, acc, newval);
pollval = qib_read_kreg32(dd, acc);
udelay(5);
pollval = qib_read_kreg32(dd, acc);
if (pollval & EPB_ACC_GNT)
owned = -1;
} else if (claim > 0) {
u64 pollval;
u64 newval = EPB_ACC_REQ | oct_sel;
qib_write_kreg(dd, acc, newval);
pollval = qib_read_kreg32(dd, acc);
udelay(5);
pollval = qib_read_kreg32(dd, acc);
if (!(pollval & EPB_ACC_GNT))
owned = -1;
}
return owned;
}
/*
* Lemma to deal with race condition of write..read to epb regs
*/
static int epb_trans(struct qib_devdata *dd, u16 reg, u64 i_val, u64 *o_vp)
{
int tries;
u64 transval;
qib_write_kreg(dd, reg, i_val);
/* Throw away first read, as RDY bit may be stale */
transval = qib_read_kreg64(dd, reg);
for (tries = EPB_TRANS_TRIES; tries; --tries) {
transval = qib_read_kreg32(dd, reg);
if (transval & EPB_TRANS_RDY)
break;
udelay(5);
}
if (transval & EPB_TRANS_ERR)
return -1;
if (tries > 0 && o_vp)
*o_vp = transval;
return tries;
}
void qib_sd7220_clr_ibpar(struct qib_devdata *dd)
{
int ret;
/* clear, then re-enable parity errs */
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6,
UC_PAR_CLR_D, UC_PAR_CLR_M);
if (ret < 0) {
qib_dev_err(dd, "Failed clearing IBSerDes Parity err\n");
goto bail;
}
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0,
UC_PAR_CLR_M);
qib_read_kreg32(dd, kr_scratch);
udelay(4);
qib_write_kreg(dd, kr_hwerrclear,
QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR);
qib_read_kreg32(dd, kr_scratch);
bail:
return;
}
/*
* query, claim, release ownership of the EPB (External Parallel Bus)
* for a specified SERDES.
* the "claim" parameter is >0 to claim, <0 to release, 0 to query.
* Returns <0 for errors, >0 if we had ownership, else 0.
*/
static int epb_access(struct qib_devdata *dd, int sdnum, int claim)
{
u16 acc;
u64 accval;
int owned = 0;
u64 oct_sel = 0;
switch (sdnum) {
case IB_7220_SERDES:
/*
* The IB SERDES "ownership" is fairly simple. A single each
* request/grant.
*/
acc = kr_ibsd_epb_access_ctrl;
break;
case PCIE_SERDES0:
case PCIE_SERDES1:
/* PCIe SERDES has two "octants", need to select which */
acc = kr_pciesd_epb_access_ctrl;
oct_sel = (2 << (sdnum - PCIE_SERDES0));
break;
default:
return 0;
}
/* Make sure any outstanding transaction was seen */
qib_read_kreg32(dd, kr_scratch);
udelay(15);
accval = qib_read_kreg32(dd, acc);
owned = !!(accval & EPB_ACC_GNT);
if (claim < 0) {
/* Need to release */
u64 pollval;
/*
* The only writeable bits are the request and CS.
* Both should be clear
*/
u64 newval = 0;
qib_write_kreg(dd, acc, newval);
/* First read after write is not trustworthy */
pollval = qib_read_kreg32(dd, acc);
udelay(5);
pollval = qib_read_kreg32(dd, acc);
if (pollval & EPB_ACC_GNT)
owned = -1;
} else if (claim > 0) {
/* Need to claim */
u64 pollval;
u64 newval = EPB_ACC_REQ | oct_sel;
qib_write_kreg(dd, acc, newval);
/* First read after write is not trustworthy */
pollval = qib_read_kreg32(dd, acc);
udelay(5);
pollval = qib_read_kreg32(dd, acc);
if (!(pollval & EPB_ACC_GNT))
owned = -1;
}
return owned;
}
/*
* Localize the stuff that should be done to change IB uC reset
* returns <0 for errors.
*/
static int qib_ibsd_reset(struct qib_devdata *dd, int assert_rst)
{
u64 rst_val;
int ret = 0;
unsigned long flags;
rst_val = qib_read_kreg64(dd, kr_ibserdesctrl);
if (assert_rst) {
/*
* Vendor recommends "interrupting" uC before reset, to
* minimize possible glitches.
*/
spin_lock_irqsave(&dd->cspec->sdepb_lock, flags);
epb_access(dd, IB_7220_SERDES, 1);
rst_val |= 1ULL;
/* Squelch possible parity error from _asserting_ reset */
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask &
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR);
qib_write_kreg(dd, kr_ibserdesctrl, rst_val);
/* flush write, delay to ensure it took effect */
qib_read_kreg32(dd, kr_scratch);
udelay(2);
/* once it's reset, can remove interrupt */
epb_access(dd, IB_7220_SERDES, -1);
spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags);
} else {
/*
* Before we de-assert reset, we need to deal with
* possible glitch on the Parity-error line.
* Suppress it around the reset, both in chip-level
* hwerrmask and in IB uC control reg. uC will allow
* it again during startup.
*/
u64 val;
rst_val &= ~(1ULL);
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask &
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR);
ret = qib_resync_ibepb(dd);
if (ret < 0)
qib_dev_err(dd, "unable to re-sync IB EPB\n");
/* set uC control regs to suppress parity errs */
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG5, 1, 1);
if (ret < 0)
goto bail;
/* IB uC code past Version 1.32.17 allow suppression of wdog */
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80,
0x80);
if (ret < 0) {
qib_dev_err(dd, "Failed to set WDOG disable\n");
goto bail;
}
qib_write_kreg(dd, kr_ibserdesctrl, rst_val);
/* flush write, delay for startup */
qib_read_kreg32(dd, kr_scratch);
udelay(1);
/* clear, then re-enable parity errs */
qib_sd7220_clr_ibpar(dd);
val = qib_read_kreg64(dd, kr_hwerrstatus);
if (val & QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR) {
qib_dev_err(dd, "IBUC Parity still set after RST\n");
dd->cspec->hwerrmask &=
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR;
}
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask);
}
bail:
return ret;
}
static int qib_ibsd_reset(struct qib_devdata *dd, int assert_rst)
{
u64 rst_val;
int ret = 0;
unsigned long flags;
rst_val = qib_read_kreg64(dd, kr_ibserdesctrl);
if (assert_rst) {
spin_lock_irqsave(&dd->cspec->sdepb_lock, flags);
epb_access(dd, IB_7220_SERDES, 1);
rst_val |= 1ULL;
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask &
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR);
qib_write_kreg(dd, kr_ibserdesctrl, rst_val);
qib_read_kreg32(dd, kr_scratch);
udelay(2);
epb_access(dd, IB_7220_SERDES, -1);
spin_unlock_irqrestore(&dd->cspec->sdepb_lock, flags);
} else {
u64 val;
rst_val &= ~(1ULL);
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask &
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR);
ret = qib_resync_ibepb(dd);
if (ret < 0)
qib_dev_err(dd, "unable to re-sync IB EPB\n");
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG5, 1, 1);
if (ret < 0)
goto bail;
ret = qib_sd7220_reg_mod(dd, IB_7220_SERDES, IB_MPREG6, 0x80,
0x80);
if (ret < 0) {
qib_dev_err(dd, "Failed to set WDOG disable\n");
goto bail;
}
qib_write_kreg(dd, kr_ibserdesctrl, rst_val);
qib_read_kreg32(dd, kr_scratch);
udelay(1);
qib_sd7220_clr_ibpar(dd);
val = qib_read_kreg64(dd, kr_hwerrstatus);
if (val & QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR) {
qib_dev_err(dd, "IBUC Parity still set after RST\n");
dd->cspec->hwerrmask &=
~QLOGIC_IB_HWE_IB_UC_MEMORYPARITYERR;
}
qib_write_kreg(dd, kr_hwerrmask,
dd->cspec->hwerrmask);
}
bail:
return ret;
}
