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ipq806x: route gpio interrupts to APPS processor through scm firmware

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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.

Signed-off-by: Pavel Kubelun <be.dissent@gmail.com>
This commit is contained in:
Pavel Kubelun 2017-03-19 07:59:26 -04:00 committed by John Crispin
parent 0d89650db1
commit ef4ca01d6f
1 changed files with 166 additions and 0 deletions
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166
target/linux/ipq806x/patches-4.9/0073-pinctrl-qom-use-scm_call-to-route-GPIO-irq-to-Apps.patch Normal file
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@ -0,0 +1,166 @@
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>
---
drivers/firmware/qcom_scm-32.c | 17 +++++++++++++++++
drivers/firmware/qcom_scm-64.c | 9 +++++++++
drivers/firmware/qcom_scm.c | 13 +++++++++++++
drivers/firmware/qcom_scm.h | 8 ++++++++
drivers/pinctrl/qcom/pinctrl-msm.c | 34 ++++++++++++++++++++++++++++------
include/linux/qcom_scm.h | 3 ++-
6 files changed, 77 insertions(+), 7 deletions(-)
--- a/drivers/firmware/qcom_scm-32.c
+++ b/drivers/firmware/qcom_scm-32.c
@@ -560,3 +560,21 @@ int __qcom_scm_pas_mss_reset(struct devi
return ret ? : le32_to_cpu(out);
}
+
+int __qcom_scm_pinmux_read(u32 svc_id, u32 cmd_id, u32 arg1)
+{
+ s32 ret;
+
+ ret = qcom_scm_call_atomic1(svc_id, cmd_id, arg1);
+
+ return ret;
+}
+
+int __qcom_scm_pinmux_write(u32 svc_id, u32 cmd_id, u32 arg1, u32 arg2)
+{
+ s32 ret;
+
+ ret = qcom_scm_call_atomic2(svc_id, cmd_id, arg1, arg2);
+
+ return ret;
+ }
--- a/drivers/firmware/qcom_scm-64.c
+++ b/drivers/firmware/qcom_scm-64.c
@@ -358,3 +358,12 @@ int __qcom_scm_pas_mss_reset(struct devi
return ret ? : res.a1;
}
+int __qcom_scm_pinmux_read(u32 svc_id, u32 cmd_id, u32 arg1)
+{
+ return -ENOTSUPP;
+}
+
+int __qcom_scm_pinmux_write(u32 svc_id, u32 cmd_id, u32 arg1, u32 arg2)
+{
+ return -ENOTSUPP;
+}
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -443,3 +443,16 @@ static int __init qcom_scm_init(void)
return platform_driver_register(&qcom_scm_driver);
}
subsys_initcall(qcom_scm_init);
+
+int qcom_scm_pinmux_read(u32 arg1)
+{
+ return __qcom_scm_pinmux_read(SCM_SVC_IO_ACCESS, SCM_IO_READ, arg1);
+}
+EXPORT_SYMBOL(qcom_scm_pinmux_read);
+
+int qcom_scm_pinmux_write(u32 arg1, u32 arg2)
+{
+ return __qcom_scm_pinmux_write(SCM_SVC_IO_ACCESS, SCM_IO_WRITE,
+ arg1, arg2);
+}
+EXPORT_SYMBOL(qcom_scm_pinmux_write);
--- a/drivers/firmware/qcom_scm.h
+++ b/drivers/firmware/qcom_scm.h
@@ -56,6 +56,13 @@ extern int __qcom_scm_pas_auth_and_rese
extern int __qcom_scm_pas_shutdown(struct device *dev, u32 peripheral);
extern int __qcom_scm_pas_mss_reset(struct device *dev, bool reset);
+#define SCM_IO_READ 1
+#define SCM_IO_WRITE 2
+#define SCM_SVC_IO_ACCESS 0x5
+
+s32 __qcom_scm_pinmux_read(u32 svc_id, u32 cmd_id, u32 arg1);
+s32 __qcom_scm_pinmux_write(u32 svc_id, u32 cmd_id, u32 arg1, u32 arg2);
+
/* common error codes */
#define QCOM_SCM_V2_EBUSY -12
#define QCOM_SCM_ENOMEM -5
--- 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"
@@ -639,6 +640,9 @@ static int msm_gpio_irq_set_type(struct
const struct msm_pingroup *g;
unsigned long flags;
u32 val;
+ u32 addr;
+ int ret;
+ const __be32 *reg;
g = &pctrl->soc->groups[d->hwirq];
@@ -652,11 +656,30 @@ static int msm_gpio_irq_set_type(struct
else
clear_bit(d->hwirq, pctrl->dual_edge_irqs);
+ 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 {
+ reg = of_get_property(pctrl->dev->of_node, "reg", NULL);
+ if (reg) {
+ addr = be32_to_cpup(reg) + g->intr_target_reg;
+ val = qcom_scm_pinmux_read(addr);
+ __iormb();
+
+ val &= ~(7 << g->intr_target_bit);
+ val |= g->intr_target_kpss_val << g->intr_target_bit;
+
+ __iowmb();
+ ret = qcom_scm_pinmux_write(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
@@ -930,4 +953,3 @@ int msm_pinctrl_remove(struct platform_d
return 0;
}
EXPORT_SYMBOL(msm_pinctrl_remove);
-
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -46,4 +46,6 @@ extern void qcom_scm_cpu_power_down(u32
extern u32 qcom_scm_get_version(void);
+extern s32 qcom_scm_pinmux_read(u32 arg1);
+extern s32 qcom_scm_pinmux_write(u32 arg1, u32 arg2);
#endif