xive: Remove historical BAR reading code

We always use physmap to assign them, take out the code
that tries to read and check the validity of the setup
done by HB or cronus.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

hw/xive.c

@@ -1512,46 +1512,6 @@ static bool xive_set_local_tables(struct xive *x)
 	return true;
 }
 
-static bool xive_read_bars(struct xive *x)
-{
-	uint64_t bar, msk;
-
-	/* Read IC BAR */
-	bar = xive_regrx(x, CQ_IC_BAR);
-	if (bar & CQ_IC_BAR_64K)
-		x->ic_shift = 16;
-	else
-		x->ic_shift = 12;
-	x->ic_size = 8ul << x->ic_shift;
-	x->ic_base = (void *)(bar & 0x00ffffffffffffffull);
-
-	/* Read TM BAR */
-	bar = xive_regrx(x, CQ_TM1_BAR);
-	assert(bar & CQ_TM_BAR_VALID);
-	if (bar & CQ_TM_BAR_64K)
-		x->tm_shift = 16;
-	else
-		x->tm_shift = 12;
-	x->tm_size = 4ul << x->tm_shift;
-	x->tm_base = (void *)(bar & 0x00ffffffffffffffull);
-
-	/* Read PC BAR */
-	bar = xive_regr(x, CQ_PC_BAR);
-	msk = xive_regr(x, CQ_PC_BARM) | 0xffffffc000000000ul;
-	assert(bar & CQ_PC_BAR_VALID);
-	x->pc_size = (~msk) + 1;
-	x->pc_base = (void *)(bar & 0x00ffffffffffffffull);
-
-	/* Read VC BAR */
-	bar = xive_regr(x, CQ_VC_BAR);
-	msk = xive_regr(x, CQ_VC_BARM) | 0xfffff80000000000ul;
-	assert(bar & CQ_VC_BAR_VALID);
-	x->vc_size = (~msk) + 1;
-	x->vc_base = (void *)(bar & 0x00ffffffffffffffull);
-
-	return true;
-}
-
 static bool xive_configure_bars(struct xive *x)
 {
 	uint64_t chip_id = x->chip_id;
@@ -1615,44 +1575,6 @@ static bool xive_configure_bars(struct xive *x)
 	if (x->last_reg_error)
 		return false;
 
-	return true;
-}
-
-static void xive_dump_mmio(struct xive *x)
-{
-	prlog(PR_DEBUG, " CQ_CFG_PB_GEN = %016llx\n",
-	      in_be64(x->ic_base + CQ_CFG_PB_GEN));
-	prlog(PR_DEBUG, " CQ_MSGSND     = %016llx\n",
-	      in_be64(x->ic_base + CQ_MSGSND));
-}
-
-static bool xive_check_update_bars(struct xive *x)
-{
-	uint64_t val;
-	bool force_assign;
-
-	/* Check if IC BAR is enabled */
-	val = xive_regrx(x, CQ_IC_BAR);
-	if (x->last_reg_error)
-		return false;
-
-	/* Check if device-tree tells us to force-assign the BARs */
-#if 0
-	force_assign = dt_has_node_property(x->x_node,
-					    "force-assign-bars", NULL);
-#else
-	force_assign = true;
-#endif
-	if ((val & CQ_IC_BAR_VALID) && !force_assign) {
-		xive_dbg(x, "IC BAR valid, using existing values\n");
-		if (!xive_read_bars(x))
-			return false;
-	} else {
-		xive_warn(x, "IC BAR invalid, reconfiguring\n");
-		if (!xive_configure_bars(x))
-			return false;
-	}
-
 	/* Calculate some MMIO bases in the VC BAR */
 	x->esb_mmio = x->vc_base;
 	x->eq_mmio = x->vc_base + (x->vc_size / VC_MAX_SETS) * VC_ESB_SETS;
@@ -1668,6 +1590,14 @@ static bool xive_check_update_bars(struct xive *x)
 	return true;
 }
 
+static void xive_dump_mmio(struct xive *x)
+{
+	prlog(PR_DEBUG, " CQ_CFG_PB_GEN = %016llx\n",
+	      in_be64(x->ic_base + CQ_CFG_PB_GEN));
+	prlog(PR_DEBUG, " CQ_MSGSND     = %016llx\n",
+	      in_be64(x->ic_base + CQ_MSGSND));
+}
+
 static bool xive_config_init(struct xive *x)
 {
 	uint64_t val __unused;
@@ -2795,8 +2725,9 @@ static struct xive *init_one_xive(struct dt_node *np)
 	//xive_regwx(x, CQ_CFG_PB_GEN, xx);
 	//xive_regwx(x, CQ_MSGSND, xx);
 
-	/* Verify the BARs are initialized and if not, setup a default layout */
-	xive_check_update_bars(x);
+	/* Setup the BARs */
+	if (!xive_configure_bars(x))
+		goto fail;
 
 	/* Some basic global inits such as page sizes etc... */
 	if (!xive_config_init(x))