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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (c) 2016, NVIDIA CORPORATION.
- */
- #define LOG_CATEGORY UCLASS_RESET
- #include <common.h>
- #include <dm.h>
- #include <fdtdec.h>
- #include <log.h>
- #include <malloc.h>
- #include <reset.h>
- #include <reset-uclass.h>
- #include <dm/devres.h>
- #include <dm/lists.h>
- static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
- {
- return (struct reset_ops *)dev->driver->ops;
- }
- static int reset_of_xlate_default(struct reset_ctl *reset_ctl,
- struct ofnode_phandle_args *args)
- {
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- if (args->args_count != 1) {
- debug("Invaild args_count: %d\n", args->args_count);
- return -EINVAL;
- }
- reset_ctl->id = args->args[0];
- return 0;
- }
- static int reset_get_by_index_tail(int ret, ofnode node,
- struct ofnode_phandle_args *args,
- const char *list_name, int index,
- struct reset_ctl *reset_ctl)
- {
- struct udevice *dev_reset;
- struct reset_ops *ops;
- assert(reset_ctl);
- reset_ctl->dev = NULL;
- if (ret)
- return ret;
- ret = uclass_get_device_by_ofnode(UCLASS_RESET, args->node,
- &dev_reset);
- if (ret) {
- debug("%s: uclass_get_device_by_ofnode() failed: %d\n",
- __func__, ret);
- debug("%s %d\n", ofnode_get_name(args->node), args->args[0]);
- return ret;
- }
- ops = reset_dev_ops(dev_reset);
- reset_ctl->dev = dev_reset;
- if (ops->of_xlate)
- ret = ops->of_xlate(reset_ctl, args);
- else
- ret = reset_of_xlate_default(reset_ctl, args);
- if (ret) {
- debug("of_xlate() failed: %d\n", ret);
- return ret;
- }
- ret = ops->request(reset_ctl);
- if (ret) {
- debug("ops->request() failed: %d\n", ret);
- return ret;
- }
- return 0;
- }
- int reset_get_by_index(struct udevice *dev, int index,
- struct reset_ctl *reset_ctl)
- {
- struct ofnode_phandle_args args;
- int ret;
- ret = dev_read_phandle_with_args(dev, "resets", "#reset-cells", 0,
- index, &args);
- return reset_get_by_index_tail(ret, dev_ofnode(dev), &args, "resets",
- index > 0, reset_ctl);
- }
- int reset_get_by_index_nodev(ofnode node, int index,
- struct reset_ctl *reset_ctl)
- {
- struct ofnode_phandle_args args;
- int ret;
- ret = ofnode_parse_phandle_with_args(node, "resets", "#reset-cells", 0,
- index, &args);
- return reset_get_by_index_tail(ret, node, &args, "resets",
- index > 0, reset_ctl);
- }
- static int __reset_get_bulk(struct udevice *dev, ofnode node,
- struct reset_ctl_bulk *bulk)
- {
- int i, ret, err, count;
- bulk->count = 0;
- count = ofnode_count_phandle_with_args(node, "resets", "#reset-cells",
- 0);
- if (count < 1)
- return count;
- bulk->resets = devm_kcalloc(dev, count, sizeof(struct reset_ctl),
- GFP_KERNEL);
- if (!bulk->resets)
- return -ENOMEM;
- for (i = 0; i < count; i++) {
- ret = reset_get_by_index_nodev(node, i, &bulk->resets[i]);
- if (ret < 0)
- goto bulk_get_err;
- ++bulk->count;
- }
- return 0;
- bulk_get_err:
- err = reset_release_all(bulk->resets, bulk->count);
- if (err)
- debug("%s: could release all resets for %p\n",
- __func__, dev);
- return ret;
- }
- int reset_get_bulk(struct udevice *dev, struct reset_ctl_bulk *bulk)
- {
- return __reset_get_bulk(dev, dev_ofnode(dev), bulk);
- }
- int reset_get_by_name(struct udevice *dev, const char *name,
- struct reset_ctl *reset_ctl)
- {
- int index;
- debug("%s(dev=%p, name=%s, reset_ctl=%p)\n", __func__, dev, name,
- reset_ctl);
- reset_ctl->dev = NULL;
- index = dev_read_stringlist_search(dev, "reset-names", name);
- if (index < 0) {
- debug("fdt_stringlist_search() failed: %d\n", index);
- return index;
- }
- return reset_get_by_index(dev, index, reset_ctl);
- }
- int reset_request(struct reset_ctl *reset_ctl)
- {
- struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- return ops->request(reset_ctl);
- }
- int reset_free(struct reset_ctl *reset_ctl)
- {
- struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- return ops->rfree(reset_ctl);
- }
- int reset_assert(struct reset_ctl *reset_ctl)
- {
- struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- return ops->rst_assert(reset_ctl);
- }
- int reset_assert_bulk(struct reset_ctl_bulk *bulk)
- {
- int i, ret;
- for (i = 0; i < bulk->count; i++) {
- ret = reset_assert(&bulk->resets[i]);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- int reset_deassert(struct reset_ctl *reset_ctl)
- {
- struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- return ops->rst_deassert(reset_ctl);
- }
- int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
- {
- int i, ret;
- for (i = 0; i < bulk->count; i++) {
- ret = reset_deassert(&bulk->resets[i]);
- if (ret < 0)
- return ret;
- }
- return 0;
- }
- int reset_status(struct reset_ctl *reset_ctl)
- {
- struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
- debug("%s(reset_ctl=%p)\n", __func__, reset_ctl);
- return ops->rst_status(reset_ctl);
- }
- int reset_release_all(struct reset_ctl *reset_ctl, int count)
- {
- int i, ret;
- for (i = 0; i < count; i++) {
- debug("%s(reset_ctl[%d]=%p)\n", __func__, i, &reset_ctl[i]);
- /* check if reset has been previously requested */
- if (!reset_ctl[i].dev)
- continue;
- ret = reset_assert(&reset_ctl[i]);
- if (ret)
- return ret;
- ret = reset_free(&reset_ctl[i]);
- if (ret)
- return ret;
- }
- return 0;
- }
- static void devm_reset_release(struct udevice *dev, void *res)
- {
- reset_free(res);
- }
- struct reset_ctl *devm_reset_control_get_by_index(struct udevice *dev,
- int index)
- {
- int rc;
- struct reset_ctl *reset_ctl;
- reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
- __GFP_ZERO);
- if (unlikely(!reset_ctl))
- return ERR_PTR(-ENOMEM);
- rc = reset_get_by_index(dev, index, reset_ctl);
- if (rc)
- return ERR_PTR(rc);
- devres_add(dev, reset_ctl);
- return reset_ctl;
- }
- struct reset_ctl *devm_reset_control_get(struct udevice *dev, const char *id)
- {
- int rc;
- struct reset_ctl *reset_ctl;
- reset_ctl = devres_alloc(devm_reset_release, sizeof(struct reset_ctl),
- __GFP_ZERO);
- if (unlikely(!reset_ctl))
- return ERR_PTR(-ENOMEM);
- rc = reset_get_by_name(dev, id, reset_ctl);
- if (rc)
- return ERR_PTR(rc);
- devres_add(dev, reset_ctl);
- return reset_ctl;
- }
- struct reset_ctl *devm_reset_control_get_optional(struct udevice *dev,
- const char *id)
- {
- struct reset_ctl *r = devm_reset_control_get(dev, id);
- if (IS_ERR(r))
- return NULL;
- return r;
- }
- static void devm_reset_bulk_release(struct udevice *dev, void *res)
- {
- struct reset_ctl_bulk *bulk = res;
- reset_release_all(bulk->resets, bulk->count);
- }
- struct reset_ctl_bulk *devm_reset_bulk_get_by_node(struct udevice *dev,
- ofnode node)
- {
- int rc;
- struct reset_ctl_bulk *bulk;
- bulk = devres_alloc(devm_reset_bulk_release,
- sizeof(struct reset_ctl_bulk),
- __GFP_ZERO);
- if (unlikely(!bulk))
- return ERR_PTR(-ENOMEM);
- rc = __reset_get_bulk(dev, node, bulk);
- if (rc)
- return ERR_PTR(rc);
- devres_add(dev, bulk);
- return bulk;
- }
- struct reset_ctl_bulk *devm_reset_bulk_get_optional_by_node(struct udevice *dev,
- ofnode node)
- {
- struct reset_ctl_bulk *bulk;
- bulk = devm_reset_bulk_get_by_node(dev, node);
- if (IS_ERR(bulk))
- return NULL;
- return bulk;
- }
- struct reset_ctl_bulk *devm_reset_bulk_get(struct udevice *dev)
- {
- return devm_reset_bulk_get_by_node(dev, dev_ofnode(dev));
- }
- struct reset_ctl_bulk *devm_reset_bulk_get_optional(struct udevice *dev)
- {
- return devm_reset_bulk_get_optional_by_node(dev, dev_ofnode(dev));
- }
- UCLASS_DRIVER(reset) = {
- .id = UCLASS_RESET,
- .name = "reset",
- };
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