[PATCH 05/11] spmi: pmic-arb: cleanup unrequested irqs

[Kiran Gunda <kgunda@codeaurora.org>]

From: Abhijeet Dharmapurikar <adharmap@codeaurora.org>

We see a unmapped irqs trigger right around bootup. This could
likely be because the bootloader exited leaving the interrupts
in an unknown or unhandled state.  Ack and mask the interrupt
if one is found. A request_irq later will unmask it and also
setup proper mapping structures.

Also the current driver ensures that no read/write transaction
is in progress while it makes changes to the interrupt regions.
This is not necessary because read/writes over spmi and arbiter
interrupt control are independent operations. Hence, remove the
synchronized accesses to interrupt region.

Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Kiran Gunda <kgunda@codeaurora.org>
---
 drivers/spmi/spmi-pmic-arb.c | 101 ++++++++++++++++++-------------------------
 1 file changed, 43 insertions(+), 58 deletions(-)

diff --git a/drivers/spmi/spmi-pmic-arb.c b/drivers/spmi/spmi-pmic-arb.c
index 6320f1f..0a5728c 100644
--- a/drivers/spmi/spmi-pmic-arb.c
+++ b/drivers/spmi/spmi-pmic-arb.c
@@ -98,6 +98,11 @@ enum pmic_arb_cmd_op_code {
 
 struct pmic_arb_ver_ops;
 
+struct apid_data {
+	u16		ppid;
+	u8		owner;
+};
+
 /**
  * spmi_pmic_arb - SPMI PMIC Arbiter object
  *
@@ -115,7 +120,6 @@ enum pmic_arb_cmd_op_code {
  * @mapping_table:	in-memory copy of PPID -> APID mapping table.
  * @domain:		irq domain object for PMIC IRQ domain
  * @spmic:		SPMI controller object
- * @apid_to_ppid:	in-memory copy of APID -> PPID mapping table.
  * @ver_ops:		version dependent operations.
  * @ppid_to_apid	in-memory copy of PPID -> channel (APID) mapping table.
  *			v2 only.
@@ -138,11 +142,10 @@ struct spmi_pmic_arb {
 	DECLARE_BITMAP(mapping_table_valid, PMIC_ARB_MAX_PERIPHS);
 	struct irq_domain	*domain;
 	struct spmi_controller	*spmic;
-	u16			*apid_to_ppid;
 	const struct pmic_arb_ver_ops *ver_ops;
 	u16			*ppid_to_apid;
 	u16			last_apid;
-	u8			*apid_to_owner;
+	struct apid_data	apid_data[PMIC_ARB_MAX_PERIPHS];
 };
 
 /**
@@ -482,6 +485,28 @@ static void qpnpint_spmi_read(struct irq_data *d, u8 reg, void *buf, size_t len)
 				    d->irq);
 }
 
+static void cleanup_irq(struct spmi_pmic_arb *pa, u8 apid, int id)
+{
+	u16 ppid = pa->apid_data[apid].ppid;
+	u8 sid = ppid >> 8;
+	u8 per = ppid & 0xFF;
+	u8 irq_mask = BIT(id);
+
+	writel_relaxed(irq_mask, pa->intr + pa->ver_ops->irq_clear(apid));
+
+	if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
+			(per << 8) + QPNPINT_REG_LATCHED_CLR, &irq_mask, 1))
+		dev_err_ratelimited(&pa->spmic->dev,
+				"failed to ack irq_mask = 0x%x for ppid = %x\n",
+				irq_mask, ppid);
+
+	if (pmic_arb_write_cmd(pa->spmic, SPMI_CMD_EXT_WRITEL, sid,
+			       (per << 8) + QPNPINT_REG_EN_CLR, &irq_mask, 1))
+		dev_err_ratelimited(&pa->spmic->dev,
+				"failed to ack irq_mask = 0x%x for ppid = %x\n",
+				irq_mask, ppid);
+}
+
 static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid)
 {
 	unsigned int irq;
@@ -493,9 +518,13 @@ static void periph_interrupt(struct spmi_pmic_arb *pa, u8 apid)
 		id = ffs(status) - 1;
 		status &= ~BIT(id);
 		irq = irq_find_mapping(pa->domain,
-				       pa->apid_to_ppid[apid] << 16
+				       pa->apid_data[apid].ppid << 16
 				     | id << 8
 				     | apid);
+		if (irq == 0) {
+			cleanup_irq(pa, apid, id);
+			continue;
+		}
 		generic_handle_irq(irq);
 	}
 }
@@ -530,12 +559,9 @@ static void qpnpint_irq_ack(struct irq_data *d)
 	struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
 	u8 irq  = d->hwirq >> 8;
 	u8 apid = d->hwirq;
-	unsigned long flags;
 	u8 data;
 
-	raw_spin_lock_irqsave(&pa->lock, flags);
 	writel_relaxed(BIT(irq), pa->intr + pa->ver_ops->irq_clear(apid));
-	raw_spin_unlock_irqrestore(&pa->lock, flags);
 
 	data = BIT(irq);
 	qpnpint_spmi_write(d, QPNPINT_REG_LATCHED_CLR, &data, 1);
@@ -543,23 +569,9 @@ static void qpnpint_irq_ack(struct irq_data *d)
 
 static void qpnpint_irq_mask(struct irq_data *d)
 {
-	struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
 	u8 irq  = d->hwirq >> 8;
-	u8 apid = d->hwirq;
-	unsigned long flags;
-	u32 status;
-	u8 data;
+	u8 data = BIT(irq);
 
-	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
-	if (status & SPMI_PIC_ACC_ENABLE_BIT) {
-		status = status & ~SPMI_PIC_ACC_ENABLE_BIT;
-		writel_relaxed(status, pa->intr +
-			       pa->ver_ops->acc_enable(apid));
-	}
-	raw_spin_unlock_irqrestore(&pa->lock, flags);
-
-	data = BIT(irq);
 	qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
 }
 
@@ -568,20 +580,12 @@ static void qpnpint_irq_unmask(struct irq_data *d)
 	struct spmi_pmic_arb *pa = irq_data_get_irq_chip_data(d);
 	u8 irq  = d->hwirq >> 8;
 	u8 apid = d->hwirq;
-	unsigned long flags;
-	u32 status;
-	u8 data;
+	u8 data = BIT(irq);
 
-	raw_spin_lock_irqsave(&pa->lock, flags);
-	status = readl_relaxed(pa->intr + pa->ver_ops->acc_enable(apid));
-	if (!(status & SPMI_PIC_ACC_ENABLE_BIT)) {
-		writel_relaxed(status | SPMI_PIC_ACC_ENABLE_BIT,
-				pa->intr + pa->ver_ops->acc_enable(apid));
-	}
-	raw_spin_unlock_irqrestore(&pa->lock, flags);
+	writel_relaxed(SPMI_PIC_ACC_ENABLE_BIT,
+		pa->intr + pa->ver_ops->acc_enable(apid));
 
-	data = BIT(irq);
-	qpnpint_spmi_write(d, QPNPINT_REG_EN_SET, &data, 1);
+	qpnpint_spmi_write(d, QPNPINT_REG_EN_CLR, &data, 1);
 }
 
 static void qpnpint_irq_enable(struct irq_data *d)
@@ -755,7 +759,7 @@ static int qpnpint_irq_domain_map(struct irq_domain *d,
 				*apid = SPMI_MAPPING_BIT_IS_1_RESULT(data);
 				pa->ppid_to_apid[ppid]
 					= *apid | PMIC_ARB_CHAN_VALID;
-				pa->apid_to_ppid[*apid] = ppid;
+				pa->apid_data[*apid].ppid = ppid;
 				return 0;
 			}
 		} else {
@@ -765,7 +769,7 @@ static int qpnpint_irq_domain_map(struct irq_domain *d,
 				*apid = SPMI_MAPPING_BIT_IS_0_RESULT(data);
 				pa->ppid_to_apid[ppid]
 					= *apid | PMIC_ARB_CHAN_VALID;
-				pa->apid_to_ppid[*apid] = ppid;
+				pa->apid_data[*apid].ppid = ppid;
 				return 0;
 			}
 		}
@@ -802,7 +806,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid)
 	for (apid = pa->last_apid; apid < pa->max_periph; apid++) {
 		regval = readl_relaxed(pa->cnfg +
 				      SPMI_OWNERSHIP_TABLE_REG(apid));
-		pa->apid_to_owner[apid] = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
+		pa->apid_data[apid].owner = SPMI_OWNERSHIP_PERIPH2OWNER(regval);
 
 		offset = PMIC_ARB_REG_CHNL(apid);
 		if (offset >= pa->core_size)
@@ -814,7 +818,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid)
 
 		id = (regval >> 8) & PMIC_ARB_PPID_MASK;
 		pa->ppid_to_apid[id] = apid | PMIC_ARB_CHAN_VALID;
-		pa->apid_to_ppid[apid] = id;
+		pa->apid_data[apid].ppid = id;
 		if (id == ppid) {
 			apid |= PMIC_ARB_CHAN_VALID;
 			break;
@@ -846,7 +850,6 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid)
 pmic_arb_mode_v2(struct spmi_pmic_arb *pa, u8 sid, u16 addr, mode_t *mode)
 {
 	u8 apid;
-	u8 owner;
 	int rc;
 
 	rc = pmic_arb_ppid_to_apid_v2(pa, sid, addr, &apid);
@@ -856,8 +859,7 @@ static u16 pmic_arb_find_apid(struct spmi_pmic_arb *pa, u16 ppid)
 	*mode = 0;
 	*mode |= S_IRUSR;
 
-	owner = pa->apid_to_owner[apid];
-	if (owner == pa->ee)
+	if (pa->ee == pa->apid_data[apid].owner)
 		*mode |= S_IWUSR;
 	return 0;
 }
@@ -1028,15 +1030,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 			err = -ENOMEM;
 			goto err_put_ctrl;
 		}
-
-		pa->apid_to_owner = devm_kcalloc(&ctrl->dev,
-						 pa->max_periph,
-						 sizeof(*pa->apid_to_owner),
-						 GFP_KERNEL);
-		if (!pa->apid_to_owner) {
-			err = -ENOMEM;
-			goto err_put_ctrl;
-		}
 	}
 
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "intr");
@@ -1088,14 +1081,6 @@ static int spmi_pmic_arb_probe(struct platform_device *pdev)
 
 	pa->ee = ee;
 
-	pa->apid_to_ppid = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PERIPHS,
-					    sizeof(*pa->apid_to_ppid),
-					    GFP_KERNEL);
-	if (!pa->apid_to_ppid) {
-		err = -ENOMEM;
-		goto err_put_ctrl;
-	}
-
 	pa->mapping_table = devm_kcalloc(&ctrl->dev, PMIC_ARB_MAX_PERIPHS - 1,
 					sizeof(*pa->mapping_table), GFP_KERNEL);
 	if (!pa->mapping_table) {
-- 
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