From 2034addc7e193dc81d7ca60d8884832751b76758 Mon Sep 17 00:00:00 2001
From: Ajay Kishore <akisho@codeaurora.org>
Date: Tue, 24 Jan 2017 14:14:16 +0530
Subject: pinctrl: qcom: use scm_call to route GPIO irq to Apps

For IPQ806x targets, TZ protects the registers that are used to
configure the routing of interrupts to a target processor.
To resolve this, this patch uses scm call to route GPIO interrupts
to application processor. Also the scm call interface is changed.

Change-Id: Ib6c06829d04bc8c20483c36e63da92e26cdef9ce
Signed-off-by: Ajay Kishore <akisho@codeaurora.org>
---

--- a/drivers/pinctrl/qcom/pinctrl-msm.c
+++ b/drivers/pinctrl/qcom/pinctrl-msm.c
@@ -30,7 +30,8 @@
 #include <linux/reboot.h>
 #include <linux/pm.h>
 #include <linux/log2.h>
-
+#include <linux/qcom_scm.h>
+#include <linux/io.h>
 #include "../core.h"
 #include "../pinconf.h"
 #include "pinctrl-msm.h"
@@ -628,6 +629,9 @@ static void msm_gpio_irq_mask(struct irq
 	const struct msm_pingroup *g;
 	unsigned long flags;
 	u32 val;
+	u32 addr;
+	int ret;
+	const __be32 *reg;
 
 	g = &pctrl->soc->groups[d->hwirq];
 
@@ -732,11 +736,30 @@ static int msm_gpio_irq_set_type(struct
 	else
 		clear_bit(d->hwirq, pctrl->dual_edge_irqs);
 
+	int ret = of_device_is_compatible(pctrl->dev->of_node,
+					"qcom,ipq8064-pinctrl");
 	/* Route interrupts to application cpu */
-	val = readl(pctrl->regs + g->intr_target_reg);
-	val &= ~(7 << g->intr_target_bit);
-	val |= g->intr_target_kpss_val << g->intr_target_bit;
-	writel(val, pctrl->regs + g->intr_target_reg);
+	if (!ret) {
+		val = readl(pctrl->regs + g->intr_target_reg);
+		val &= ~(7 << g->intr_target_bit);
+		val |= g->intr_target_kpss_val << g->intr_target_bit;
+		writel(val, pctrl->regs + g->intr_target_reg);
+	} else {
+		const __be32 *reg = of_get_property(pctrl->dev->of_node, "reg", NULL);
+		if (reg) {
+			u32 addr = be32_to_cpup(reg) + g->intr_target_reg;
+			qcom_scm_io_readl(addr, &val);
+			__iormb();
+
+			val &= ~(7 << g->intr_target_bit);
+			val |= g->intr_target_kpss_val << g->intr_target_bit;
+
+			__iowmb();
+			ret = qcom_scm_io_writel(addr, val);
+			if (ret)
+				pr_err("\n Routing interrupts to Apps proc failed");
+		}
+	}
 
 	/* Update configuration for gpio.
 	 * RAW_STATUS_EN is left on for all gpio irqs. Due to the
