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