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Diffstat (limited to 'drivers/dma/qcom/hidma_mgmt_sys.c')
-rw-r--r--drivers/dma/qcom/hidma_mgmt_sys.c285
1 files changed, 285 insertions, 0 deletions
diff --git a/drivers/dma/qcom/hidma_mgmt_sys.c b/drivers/dma/qcom/hidma_mgmt_sys.c
new file mode 100644
index 000000000..930eae0a6
--- /dev/null
+++ b/drivers/dma/qcom/hidma_mgmt_sys.c
@@ -0,0 +1,285 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Qualcomm Technologies HIDMA Management SYS interface
+ *
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/sysfs.h>
+#include <linux/platform_device.h>
+
+#include "hidma_mgmt.h"
+
+struct hidma_chan_attr {
+ struct hidma_mgmt_dev *mdev;
+ int index;
+ struct kobj_attribute attr;
+};
+
+struct hidma_mgmt_fileinfo {
+ char *name;
+ int mode;
+ int (*get)(struct hidma_mgmt_dev *mdev);
+ int (*set)(struct hidma_mgmt_dev *mdev, u64 val);
+};
+
+#define IMPLEMENT_GETSET(name) \
+static int get_##name(struct hidma_mgmt_dev *mdev) \
+{ \
+ return mdev->name; \
+} \
+static int set_##name(struct hidma_mgmt_dev *mdev, u64 val) \
+{ \
+ u64 tmp; \
+ int rc; \
+ \
+ tmp = mdev->name; \
+ mdev->name = val; \
+ rc = hidma_mgmt_setup(mdev); \
+ if (rc) \
+ mdev->name = tmp; \
+ return rc; \
+}
+
+#define DECLARE_ATTRIBUTE(name, mode) \
+ {#name, mode, get_##name, set_##name}
+
+IMPLEMENT_GETSET(hw_version_major)
+IMPLEMENT_GETSET(hw_version_minor)
+IMPLEMENT_GETSET(max_wr_xactions)
+IMPLEMENT_GETSET(max_rd_xactions)
+IMPLEMENT_GETSET(max_write_request)
+IMPLEMENT_GETSET(max_read_request)
+IMPLEMENT_GETSET(dma_channels)
+IMPLEMENT_GETSET(chreset_timeout_cycles)
+
+static int set_priority(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
+{
+ u64 tmp;
+ int rc;
+
+ if (i >= mdev->dma_channels)
+ return -EINVAL;
+
+ tmp = mdev->priority[i];
+ mdev->priority[i] = val;
+ rc = hidma_mgmt_setup(mdev);
+ if (rc)
+ mdev->priority[i] = tmp;
+ return rc;
+}
+
+static int set_weight(struct hidma_mgmt_dev *mdev, unsigned int i, u64 val)
+{
+ u64 tmp;
+ int rc;
+
+ if (i >= mdev->dma_channels)
+ return -EINVAL;
+
+ tmp = mdev->weight[i];
+ mdev->weight[i] = val;
+ rc = hidma_mgmt_setup(mdev);
+ if (rc)
+ mdev->weight[i] = tmp;
+ return rc;
+}
+
+static struct hidma_mgmt_fileinfo hidma_mgmt_files[] = {
+ DECLARE_ATTRIBUTE(hw_version_major, S_IRUGO),
+ DECLARE_ATTRIBUTE(hw_version_minor, S_IRUGO),
+ DECLARE_ATTRIBUTE(dma_channels, S_IRUGO),
+ DECLARE_ATTRIBUTE(chreset_timeout_cycles, S_IRUGO),
+ DECLARE_ATTRIBUTE(max_wr_xactions, S_IRUGO),
+ DECLARE_ATTRIBUTE(max_rd_xactions, S_IRUGO),
+ DECLARE_ATTRIBUTE(max_write_request, S_IRUGO),
+ DECLARE_ATTRIBUTE(max_read_request, S_IRUGO),
+};
+
+static ssize_t show_values(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev);
+ unsigned int i;
+
+ buf[0] = 0;
+
+ for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
+ if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
+ sprintf(buf, "%d\n", hidma_mgmt_files[i].get(mdev));
+ break;
+ }
+ }
+ return strlen(buf);
+}
+
+static ssize_t set_values(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hidma_mgmt_dev *mdev = dev_get_drvdata(dev);
+ unsigned long tmp;
+ unsigned int i;
+ int rc;
+
+ rc = kstrtoul(buf, 0, &tmp);
+ if (rc)
+ return rc;
+
+ for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
+ if (strcmp(attr->attr.name, hidma_mgmt_files[i].name) == 0) {
+ rc = hidma_mgmt_files[i].set(mdev, tmp);
+ if (rc)
+ return rc;
+
+ break;
+ }
+ }
+ return count;
+}
+
+static ssize_t show_values_channel(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct hidma_chan_attr *chattr;
+ struct hidma_mgmt_dev *mdev;
+
+ buf[0] = 0;
+ chattr = container_of(attr, struct hidma_chan_attr, attr);
+ mdev = chattr->mdev;
+ if (strcmp(attr->attr.name, "priority") == 0)
+ sprintf(buf, "%d\n", mdev->priority[chattr->index]);
+ else if (strcmp(attr->attr.name, "weight") == 0)
+ sprintf(buf, "%d\n", mdev->weight[chattr->index]);
+
+ return strlen(buf);
+}
+
+static ssize_t set_values_channel(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf,
+ size_t count)
+{
+ struct hidma_chan_attr *chattr;
+ struct hidma_mgmt_dev *mdev;
+ unsigned long tmp;
+ int rc;
+
+ chattr = container_of(attr, struct hidma_chan_attr, attr);
+ mdev = chattr->mdev;
+
+ rc = kstrtoul(buf, 0, &tmp);
+ if (rc)
+ return rc;
+
+ if (strcmp(attr->attr.name, "priority") == 0) {
+ rc = set_priority(mdev, chattr->index, tmp);
+ if (rc)
+ return rc;
+ } else if (strcmp(attr->attr.name, "weight") == 0) {
+ rc = set_weight(mdev, chattr->index, tmp);
+ if (rc)
+ return rc;
+ }
+ return count;
+}
+
+static int create_sysfs_entry(struct hidma_mgmt_dev *dev, char *name, int mode)
+{
+ struct device_attribute *attrs;
+ char *name_copy;
+
+ attrs = devm_kmalloc(&dev->pdev->dev,
+ sizeof(struct device_attribute), GFP_KERNEL);
+ if (!attrs)
+ return -ENOMEM;
+
+ name_copy = devm_kstrdup(&dev->pdev->dev, name, GFP_KERNEL);
+ if (!name_copy)
+ return -ENOMEM;
+
+ attrs->attr.name = name_copy;
+ attrs->attr.mode = mode;
+ attrs->show = show_values;
+ attrs->store = set_values;
+ sysfs_attr_init(&attrs->attr);
+
+ return device_create_file(&dev->pdev->dev, attrs);
+}
+
+static int create_sysfs_entry_channel(struct hidma_mgmt_dev *mdev, char *name,
+ int mode, int index,
+ struct kobject *parent)
+{
+ struct hidma_chan_attr *chattr;
+ char *name_copy;
+
+ chattr = devm_kmalloc(&mdev->pdev->dev, sizeof(*chattr), GFP_KERNEL);
+ if (!chattr)
+ return -ENOMEM;
+
+ name_copy = devm_kstrdup(&mdev->pdev->dev, name, GFP_KERNEL);
+ if (!name_copy)
+ return -ENOMEM;
+
+ chattr->mdev = mdev;
+ chattr->index = index;
+ chattr->attr.attr.name = name_copy;
+ chattr->attr.attr.mode = mode;
+ chattr->attr.show = show_values_channel;
+ chattr->attr.store = set_values_channel;
+ sysfs_attr_init(&chattr->attr.attr);
+
+ return sysfs_create_file(parent, &chattr->attr.attr);
+}
+
+int hidma_mgmt_init_sys(struct hidma_mgmt_dev *mdev)
+{
+ unsigned int i;
+ int rc;
+ int required;
+ struct kobject *chanops;
+
+ required = sizeof(*mdev->chroots) * mdev->dma_channels;
+ mdev->chroots = devm_kmalloc(&mdev->pdev->dev, required, GFP_KERNEL);
+ if (!mdev->chroots)
+ return -ENOMEM;
+
+ chanops = kobject_create_and_add("chanops", &mdev->pdev->dev.kobj);
+ if (!chanops)
+ return -ENOMEM;
+
+ /* create each channel directory here */
+ for (i = 0; i < mdev->dma_channels; i++) {
+ char name[20];
+
+ snprintf(name, sizeof(name), "chan%d", i);
+ mdev->chroots[i] = kobject_create_and_add(name, chanops);
+ if (!mdev->chroots[i])
+ return -ENOMEM;
+ }
+
+ /* populate common parameters */
+ for (i = 0; i < ARRAY_SIZE(hidma_mgmt_files); i++) {
+ rc = create_sysfs_entry(mdev, hidma_mgmt_files[i].name,
+ hidma_mgmt_files[i].mode);
+ if (rc)
+ return rc;
+ }
+
+ /* populate parameters that are per channel */
+ for (i = 0; i < mdev->dma_channels; i++) {
+ rc = create_sysfs_entry_channel(mdev, "priority",
+ (S_IRUGO | S_IWUGO), i,
+ mdev->chroots[i]);
+ if (rc)
+ return rc;
+
+ rc = create_sysfs_entry_channel(mdev, "weight",
+ (S_IRUGO | S_IWUGO), i,
+ mdev->chroots[i]);
+ if (rc)
+ return rc;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hidma_mgmt_init_sys);