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![Andreas Dannenberg](/assets/img/avatar_default.png)
Add a reset operations function pointer to support querying the current status of a reset control. Reviewed-by: Tom Rini <trini@konsulko.com> Signed-off-by: Andreas Dannenberg <dannenberg@ti.com> Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
231 lines
4.6 KiB
C
231 lines
4.6 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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#include <common.h>
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#include <dm.h>
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#include <fdtdec.h>
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#include <reset.h>
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#include <reset-uclass.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("Invaild 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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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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struct udevice *dev_reset;
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struct reset_ops *ops;
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debug("%s(dev=%p, index=%d, reset_ctl=%p)\n", __func__, dev, index,
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reset_ctl);
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reset_ctl->dev = NULL;
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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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if (ret) {
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debug("%s: fdtdec_parse_phandle_with_args() failed: %d\n",
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__func__, ret);
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return ret;
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}
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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_bulk(struct udevice *dev, 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 = dev_count_phandle_with_args(dev, "resets", "#reset-cells");
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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(dev, 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_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->free(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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UCLASS_DRIVER(reset) = {
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.id = UCLASS_RESET,
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.name = "reset",
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};
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