drivers: soc: qcom: Add snapshot of cpuss dump driver
Snapshot of cpuss dump driver taken from msm-4.4 commit
<c605e110ab18604> (Merge "usb: gadget: composite: Return bcdUSB 0x0310
for Superspeed and higher").
In addition fix coding style issues.
CRs-Fixed: 1058357
Change-Id: I533596276a97f0e1cbea7a2d5afe7a7f776acab4
Signed-off-by: Channagoud Kadabi <ckadabi@codeaurora.org>
diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index efbc5d2..a1232fc 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -1,6 +1,15 @@
#
# QCOM Soc drivers
#
+config QCOM_CPUSS_DUMP
+ bool "CPU Subsystem Dumping support"
+ help
+ Add support to dump various hardware entities such as the instruction
+ and data tlb's as well as the unified tlb, which are a part of the
+ cpu subsystem to an allocated buffer. This allows for analysis of the
+ the entities if corruption is suspected.
+ If unsure, say N
+
config QCOM_GSBI
tristate "QCOM General Serial Bus Interface"
depends on ARCH_QCOM
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 4008f8d..e41132a 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_QCOM_CPUSS_DUMP) += cpuss_dump.o
obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
obj-$(CONFIG_QCOM_PM) += spm.o
obj-$(CONFIG_QCOM_SMD) += smd.o
diff --git a/drivers/soc/qcom/cpuss_dump.c b/drivers/soc/qcom/cpuss_dump.c
new file mode 100644
index 0000000..886a32f
--- /dev/null
+++ b/drivers/soc/qcom/cpuss_dump.c
@@ -0,0 +1,124 @@
+/* Copyright (c) 2014-2016, 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/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <soc/qcom/memory_dump.h>
+
+static int cpuss_dump_probe(struct platform_device *pdev)
+{
+ struct device_node *child_node, *dump_node;
+ const struct device_node *node = pdev->dev.of_node;
+ static dma_addr_t dump_addr;
+ static void *dump_vaddr;
+ struct msm_dump_data *dump_data;
+ struct msm_dump_entry dump_entry;
+ int ret;
+ u32 size, id;
+
+ for_each_available_child_of_node(node, child_node) {
+ dump_node = of_parse_phandle(child_node, "qcom,dump-node", 0);
+
+ if (!dump_node) {
+ dev_err(&pdev->dev, "Unable to find node for %s\n",
+ child_node->name);
+ continue;
+ }
+
+ ret = of_property_read_u32(dump_node, "qcom,dump-size", &size);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to find size for %s\n",
+ dump_node->name);
+ continue;
+ }
+
+ ret = of_property_read_u32(child_node, "qcom,dump-id", &id);
+ if (ret) {
+ dev_err(&pdev->dev, "Unable to find id for %s\n",
+ child_node->name);
+ continue;
+ }
+
+ dump_vaddr = (void *) dma_alloc_coherent(&pdev->dev, size,
+ &dump_addr, GFP_KERNEL);
+
+ if (!dump_vaddr) {
+ dev_err(&pdev->dev, "Couldn't get memory for dumping\n");
+ continue;
+ }
+
+ memset(dump_vaddr, 0x0, size);
+
+ dump_data = devm_kzalloc(&pdev->dev,
+ sizeof(struct msm_dump_data), GFP_KERNEL);
+ if (!dump_data) {
+ dma_free_coherent(&pdev->dev, size, dump_vaddr,
+ dump_addr);
+ continue;
+ }
+
+ dump_data->addr = dump_addr;
+ dump_data->len = size;
+ dump_entry.id = id;
+ dump_entry.addr = virt_to_phys(dump_data);
+ ret = msm_dump_data_register(MSM_DUMP_TABLE_APPS, &dump_entry);
+ if (ret) {
+ dev_err(&pdev->dev, "Data dump setup failed, id = %d\n",
+ id);
+ dma_free_coherent(&pdev->dev, size, dump_vaddr,
+ dump_addr);
+ devm_kfree(&pdev->dev, dump_data);
+ }
+
+ }
+ return 0;
+}
+
+static int cpuss_dump_remove(struct platform_device *pdev)
+{
+ return 0;
+}
+
+static const struct of_device_id cpuss_dump_match_table[] = {
+ { .compatible = "qcom,cpuss-dump", },
+ {}
+};
+
+static struct platform_driver cpuss_dump_driver = {
+ .probe = cpuss_dump_probe,
+ .remove = cpuss_dump_remove,
+ .driver = {
+ .name = "msm_cpuss_dump",
+ .owner = THIS_MODULE,
+ .of_match_table = cpuss_dump_match_table,
+ },
+};
+
+static int __init cpuss_dump_init(void)
+{
+ return platform_driver_register(&cpuss_dump_driver);
+}
+
+static void __exit cpuss_dump_exit(void)
+{
+ platform_driver_unregister(&cpuss_dump_driver);
+}
+
+subsys_initcall(cpuss_dump_init);
+module_exit(cpuss_dump_exit)
+