Merge "drivers: soc: Add sdx ipc driver to communicate with external AP"
diff --git a/Documentation/devicetree/bindings/arm/msm/sdx-ext-ipc.txt b/Documentation/devicetree/bindings/arm/msm/sdx-ext-ipc.txt
new file mode 100644
index 0000000..689c5b6
--- /dev/null
+++ b/Documentation/devicetree/bindings/arm/msm/sdx-ext-ipc.txt
@@ -0,0 +1,31 @@
+Modem chipset attached to Application processor
+
+Modem chipset can be connected to an external apss processor. The control
+channel between the two chipsets consists of gpios that can relay the
+state of one subsytem to another. Modem can indicate different events
+(bootup/crash etc.) to AP and can get the same information from AP.
+
+Required Properties:
+- compatible: "qcom,sdx-ext-ipc".
+
+Required named gpio properties:
+- qcom,mdm2ap-status-gpio: gpio for modem to indicate the boot status to APQ.
+
+- qcom,ap2mdm-status-gpio: gpio for APQ to indicate the boot status to modem.
+
+
+
+Optional named gpio properties:
+- qcom,mdm2ap-status2-gpio: gpio for modem to indicate to APQ that it is in
+ E911 call or doing firmware upgrade.
+
+- qcom,ap2mdm-status2-gpio: gpio for APQ to indicate graceful shutdown to modem.
+
+Example:
+ sdx_ext_ipc: qcom,sdx_ext_ipc {
+ compatible = "qcom,sdx-ext-ipc";
+ qcom,ap2mdm-status-gpio = <&tlmm 64 0x00>;
+ qcom,ap2mdm-status2-gpio = <&tlmm 65 0x00>;
+ qcom,mdm2ap-status-gpio = <&tlmm 63 0x00>;
+ qcom,mdm2ap-status2-gpio = <&tlmm 66 0x00>;
+ };
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index cbf1734..6a6fc8c 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -274,6 +274,16 @@
If unsure, say N.
+config SDX_EXT_IPC
+ tristate "QCOM external ipc driver"
+ help
+ This enables the module to help modem communicate with external
+ Application processor connected to Qualcomm Technologies, Inc
+ modem chipset. The modem and APQ can understand each other's
+ state by reading ipc gpios.
+
+ If unsure, say N.
+
config PANIC_ON_GLADIATOR_ERROR
depends on MSM_GLADIATOR_ERP
bool "Panic on GLADIATOR error report"
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 1dda5d1..c61594b 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -78,6 +78,7 @@
obj-$(CONFIG_MSM_BGCOM) += bgcom_spi.o
obj-$(CONFIG_MSM_PERFORMANCE) += msm_performance.o
+obj-$(CONFIG_SDX_EXT_IPC) += sdx_ext_ipc.o
ifdef CONFIG_MSM_SUBSYSTEM_RESTART
obj-y += subsystem_notif.o
diff --git a/drivers/soc/qcom/sdx_ext_ipc.c b/drivers/soc/qcom/sdx_ext_ipc.c
new file mode 100644
index 0000000..2b18017
--- /dev/null
+++ b/drivers/soc/qcom/sdx_ext_ipc.c
@@ -0,0 +1,267 @@
+/* Copyright (c) 2019, The Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/gpio.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+
+
+enum subsys_policies {
+ SUBSYS_PANIC = 0,
+ SUBSYS_NOP,
+};
+
+static const char * const policies[] = {
+ [SUBSYS_PANIC] = "PANIC",
+ [SUBSYS_NOP] = "NOP",
+};
+
+enum gpios {
+ AP2MDM_STATUS = 0,
+ MDM2AP_STATUS,
+ MDM2AP_STATUS2,
+ NUM_GPIOS,
+};
+
+static const char * const gpio_map[] = {
+ [AP2MDM_STATUS] = "qcom,ap2mdm-status-gpio",
+ [MDM2AP_STATUS] = "qcom,mdm2ap-status-gpio",
+ [MDM2AP_STATUS2] = "qcom,mdm2ap-status2-gpio",
+};
+
+struct gpio_cntrl {
+ unsigned int gpios[NUM_GPIOS];
+ int status_irq;
+ int policy;
+ struct device *dev;
+ struct mutex policy_lock;
+ struct notifier_block panic_blk;
+};
+
+static ssize_t policy_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ int ret;
+ struct gpio_cntrl *mdm = dev_get_drvdata(dev);
+
+ mutex_lock(&mdm->policy_lock);
+ ret = scnprintf(buf, strlen(policies[mdm->policy]) + 1,
+ policies[mdm->policy]);
+ mutex_unlock(&mdm->policy_lock);
+
+ return ret;
+}
+
+static ssize_t policy_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct gpio_cntrl *mdm = dev_get_drvdata(dev);
+ const char *p;
+ int i, orig_count = count;
+
+ p = memchr(buf, '\n', count);
+ if (p)
+ count = p - buf;
+
+ for (i = 0; i < ARRAY_SIZE(policies); i++)
+ if (!strncasecmp(buf, policies[i], count)) {
+ mutex_lock(&mdm->policy_lock);
+ mdm->policy = i;
+ mutex_unlock(&mdm->policy_lock);
+ return orig_count;
+ }
+ return -EPERM;
+}
+static DEVICE_ATTR_RW(policy);
+
+static irqreturn_t ap_status_change(int irq, void *dev_id)
+{
+ struct gpio_cntrl *mdm = dev_id;
+ int state;
+ struct gpio_desc *gp_status = gpio_to_desc(mdm->gpios[AP2MDM_STATUS]);
+ int active_low = 0;
+
+ if (gp_status)
+ active_low = gpiod_is_active_low(gp_status);
+
+ state = gpio_get_value(mdm->gpios[AP2MDM_STATUS]);
+ if ((!active_low && !state) || (active_low && state)) {
+ if (mdm->policy)
+ dev_info(mdm->dev, "Host undergoing SSR, leaving SDX as it is\n");
+ else
+ panic("Host undergoing SSR, panicking SDX\n");
+ } else
+ dev_info(mdm->dev, "HOST booted\n");
+
+ return IRQ_HANDLED;
+}
+
+static void remove_ipc(struct gpio_cntrl *mdm)
+{
+ int i;
+
+ for (i = 0; i < NUM_GPIOS; ++i) {
+ if (gpio_is_valid(mdm->gpios[i]))
+ gpio_free(mdm->gpios[i]);
+ }
+}
+
+static int setup_ipc(struct gpio_cntrl *mdm)
+{
+ int i, val, ret, irq;
+ struct device_node *node;
+
+ node = mdm->dev->of_node;
+ for (i = 0; i < ARRAY_SIZE(gpio_map); i++) {
+ val = of_get_named_gpio(node, gpio_map[i], 0);
+ if (val >= 0)
+ mdm->gpios[i] = val;
+ }
+
+ ret = gpio_request(mdm->gpios[AP2MDM_STATUS], "AP2MDM_STATUS");
+ if (ret) {
+ dev_err(mdm->dev, "Failed to configure AP2MDM_STATUS gpio\n");
+ return ret;
+ }
+ gpio_direction_input(mdm->gpios[AP2MDM_STATUS]);
+
+ ret = gpio_request(mdm->gpios[MDM2AP_STATUS], "MDM2AP_STATUS");
+ if (ret) {
+ dev_err(mdm->dev, "Failed to configure MDM2AP_STATUS gpio\n");
+ return ret;
+ }
+ gpio_direction_output(mdm->gpios[MDM2AP_STATUS], 1);
+
+ ret = gpio_request(mdm->gpios[MDM2AP_STATUS2], "MDM2AP_STATUS2");
+ if (ret) {
+ dev_err(mdm->dev, "Failed to configure MDM2AP_STATUS2 gpio\n");
+ return ret;
+ }
+ gpio_direction_output(mdm->gpios[MDM2AP_STATUS2], 0);
+
+ irq = gpio_to_irq(mdm->gpios[AP2MDM_STATUS]);
+ if (irq < 0) {
+ dev_err(mdm->dev, "bad AP2MDM_STATUS IRQ resource\n");
+ return irq;
+ }
+ mdm->status_irq = irq;
+
+ return 0;
+}
+
+static int sdx_ext_ipc_panic(struct notifier_block *this,
+ unsigned long event, void *ptr)
+{
+ struct gpio_cntrl *mdm = container_of(this,
+ struct gpio_cntrl, panic_blk);
+
+ gpio_set_value(mdm->gpios[MDM2AP_STATUS], 0);
+
+ return NOTIFY_DONE;
+}
+
+static int sdx_ext_ipc_probe(struct platform_device *pdev)
+{
+ int ret;
+ struct device_node *node;
+ struct gpio_cntrl *mdm;
+
+ node = pdev->dev.of_node;
+ mdm = devm_kzalloc(&pdev->dev, sizeof(*mdm), GFP_KERNEL);
+ if (!mdm)
+ return -ENOMEM;
+
+ mdm->dev = &pdev->dev;
+ ret = setup_ipc(mdm);
+ if (ret) {
+ dev_err(mdm->dev, "Error setting up gpios\n");
+ devm_kfree(&pdev->dev, mdm);
+ return ret;
+ }
+
+ mdm->panic_blk.notifier_call = sdx_ext_ipc_panic;
+ atomic_notifier_chain_register(&panic_notifier_list, &mdm->panic_blk);
+
+ mutex_init(&mdm->policy_lock);
+ mdm->policy = SUBSYS_PANIC;
+
+ ret = device_create_file(mdm->dev, &dev_attr_policy);
+ if (ret) {
+ dev_err(mdm->dev, "cannot create sysfs attribute\n");
+ goto sys_fail;
+ }
+
+ platform_set_drvdata(pdev, mdm);
+
+ ret = devm_request_irq(mdm->dev, mdm->status_irq, ap_status_change,
+ IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
+ "ap status", mdm);
+ if (ret < 0) {
+ dev_err(mdm->dev, "%s: AP2MDM_STATUS IRQ#%d request failed,\n",
+ __func__, mdm->status_irq);
+ goto irq_fail;
+ }
+ irq_set_irq_wake(mdm->status_irq, 1);
+ return 0;
+
+irq_fail:
+ device_remove_file(mdm->dev, &dev_attr_policy);
+sys_fail:
+ atomic_notifier_chain_unregister(&panic_notifier_list, &mdm->panic_blk);
+ remove_ipc(mdm);
+ devm_kfree(&pdev->dev, mdm);
+ return ret;
+}
+
+static int sdx_ext_ipc_remove(struct platform_device *pdev)
+{
+ struct gpio_cntrl *mdm;
+
+ mdm = dev_get_drvdata(&pdev->dev);
+ disable_irq_wake(mdm->status_irq);
+ atomic_notifier_chain_unregister(&panic_notifier_list, &mdm->panic_blk);
+ remove_ipc(mdm);
+ device_remove_file(mdm->dev, &dev_attr_policy);
+ return 0;
+}
+
+static const struct of_device_id sdx_ext_ipc_of_match[] = {
+ { .compatible = "qcom,sdx-ext-ipc"},
+ {},
+};
+
+static struct platform_driver sdx_ext_ipc_driver = {
+ .probe = sdx_ext_ipc_probe,
+ .remove = sdx_ext_ipc_remove,
+ .driver = {
+ .name = "sdx-ext-ipc",
+ .owner = THIS_MODULE,
+ .of_match_table = sdx_ext_ipc_of_match,
+ },
+};
+
+static int __init sdx_ext_ipc_register(void)
+{
+ return platform_driver_register(&sdx_ext_ipc_driver);
+}
+subsys_initcall(sdx_ext_ipc_register);
+
+static void __exit sdx_ext_ipc_unregister(void)
+{
+ platform_driver_unregister(&sdx_ext_ipc_driver);
+}
+module_exit(sdx_ext_ipc_unregister);
+MODULE_LICENSE("GPL v2");