X-Git-Url: http://git.ipfire.org/?a=blobdiff_plain;f=drivers%2Fclk%2Fclk-uclass.c;h=ad763795d9e8ef8912c08d5d4a8f8520caf1b3fd;hb=e9a98ba312a325b6af1a9b75b3ce0ab0232dc614;hp=83ba13374c78a36acb25c45107c781df82a40925;hpb=bc79617fdfeb4afabb94774885447dd64d7bea6c;p=people%2Fms%2Fu-boot.git diff --git a/drivers/clk/clk-uclass.c b/drivers/clk/clk-uclass.c index 83ba13374c..ad763795d9 100644 --- a/drivers/clk/clk-uclass.c +++ b/drivers/clk/clk-uclass.c @@ -2,6 +2,7 @@ * Copyright (C) 2015 Google, Inc * Written by Simon Glass * Copyright (c) 2016, NVIDIA CORPORATION. + * Copyright (c) 2018, Theobroma Systems Design und Consulting GmbH * * SPDX-License-Identifier: GPL-2.0+ */ @@ -10,14 +11,13 @@ #include #include #include +#include #include #include -DECLARE_GLOBAL_DATA_PTR; - -static inline struct clk_ops *clk_dev_ops(struct udevice *dev) +static inline const struct clk_ops *clk_dev_ops(struct udevice *dev) { - return (struct clk_ops *)dev->driver->ops; + return (const struct clk_ops *)dev->driver->ops; } #if CONFIG_IS_ENABLED(OF_CONTROL) @@ -55,20 +55,21 @@ static int clk_of_xlate_default(struct clk *clk, return 0; } -int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) +static int clk_get_by_indexed_prop(struct udevice *dev, const char *prop_name, + int index, struct clk *clk) { int ret; struct ofnode_phandle_args args; struct udevice *dev_clk; - struct clk_ops *ops; + const struct clk_ops *ops; debug("%s(dev=%p, index=%d, clk=%p)\n", __func__, dev, index, clk); assert(clk); clk->dev = NULL; - ret = dev_read_phandle_with_args(dev, "clocks", "#clock-cells", 0, - index, &args); + ret = dev_read_phandle_with_args(dev, prop_name, "#clock-cells", 0, + index, &args); if (ret) { debug("%s: fdtdec_parse_phandle_with_args failed: err=%d\n", __func__, ret); @@ -97,6 +98,127 @@ int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) return clk_request(dev_clk, clk); } + +int clk_get_by_index(struct udevice *dev, int index, struct clk *clk) +{ + return clk_get_by_indexed_prop(dev, "clocks", index, clk); +} + +static int clk_set_default_parents(struct udevice *dev) +{ + struct clk clk, parent_clk; + int index; + int num_parents; + int ret; + + num_parents = dev_count_phandle_with_args(dev, "assigned-clock-parents", + "#clock-cells"); + if (num_parents < 0) { + debug("%s: could not read assigned-clock-parents for %p\n", + __func__, dev); + return 0; + } + + for (index = 0; index < num_parents; index++) { + ret = clk_get_by_indexed_prop(dev, "assigned-clock-parents", + index, &parent_clk); + if (ret) { + debug("%s: could not get parent clock %d for %s\n", + __func__, index, dev_read_name(dev)); + return ret; + } + + ret = clk_get_by_indexed_prop(dev, "assigned-clocks", + index, &clk); + if (ret) { + debug("%s: could not get assigned clock %d for %s\n", + __func__, index, dev_read_name(dev)); + return ret; + } + + ret = clk_set_parent(&clk, &parent_clk); + + /* + * Not all drivers may support clock-reparenting (as of now). + * Ignore errors due to this. + */ + if (ret == -ENOSYS) + continue; + + if (ret) { + debug("%s: failed to reparent clock %d for %s\n", + __func__, index, dev_read_name(dev)); + return ret; + } + } + + return 0; +} + +static int clk_set_default_rates(struct udevice *dev) +{ + struct clk clk; + int index; + int num_rates; + int size; + int ret = 0; + u32 *rates = NULL; + + size = dev_read_size(dev, "assigned-clock-rates"); + if (size < 0) + return 0; + + num_rates = size / sizeof(u32); + rates = calloc(num_rates, sizeof(u32)); + if (!rates) + return -ENOMEM; + + ret = dev_read_u32_array(dev, "assigned-clock-rates", rates, num_rates); + if (ret) + goto fail; + + for (index = 0; index < num_rates; index++) { + ret = clk_get_by_indexed_prop(dev, "assigned-clocks", + index, &clk); + if (ret) { + debug("%s: could not get assigned clock %d for %s\n", + __func__, index, dev_read_name(dev)); + continue; + } + + ret = clk_set_rate(&clk, rates[index]); + if (ret < 0) { + debug("%s: failed to set rate on clock %d for %s\n", + __func__, index, dev_read_name(dev)); + break; + } + } + +fail: + free(rates); + return ret; +} + +int clk_set_defaults(struct udevice *dev) +{ + int ret; + + /* If this is running pre-reloc state, don't take any action. */ + if (!(gd->flags & GD_FLG_RELOC)) + return 0; + + debug("%s(%s)\n", __func__, dev_read_name(dev)); + + ret = clk_set_default_parents(dev); + if (ret) + return ret; + + ret = clk_set_default_rates(dev); + if (ret < 0) + return ret; + + return 0; +} # endif /* OF_PLATDATA */ int clk_get_by_name(struct udevice *dev, const char *name, struct clk *clk) @@ -142,7 +264,7 @@ int clk_release_all(struct clk *clk, int count) int clk_request(struct udevice *dev, struct clk *clk) { - struct clk_ops *ops = clk_dev_ops(dev); + const struct clk_ops *ops = clk_dev_ops(dev); debug("%s(dev=%p, clk=%p)\n", __func__, dev, clk); @@ -156,7 +278,7 @@ int clk_request(struct udevice *dev, struct clk *clk) int clk_free(struct clk *clk) { - struct clk_ops *ops = clk_dev_ops(clk->dev); + const struct clk_ops *ops = clk_dev_ops(clk->dev); debug("%s(clk=%p)\n", __func__, clk); @@ -168,7 +290,7 @@ int clk_free(struct clk *clk) ulong clk_get_rate(struct clk *clk) { - struct clk_ops *ops = clk_dev_ops(clk->dev); + const struct clk_ops *ops = clk_dev_ops(clk->dev); debug("%s(clk=%p)\n", __func__, clk); @@ -180,7 +302,7 @@ ulong clk_get_rate(struct clk *clk) ulong clk_set_rate(struct clk *clk, ulong rate) { - struct clk_ops *ops = clk_dev_ops(clk->dev); + const struct clk_ops *ops = clk_dev_ops(clk->dev); debug("%s(clk=%p, rate=%lu)\n", __func__, clk, rate); @@ -190,9 +312,21 @@ ulong clk_set_rate(struct clk *clk, ulong rate) return ops->set_rate(clk, rate); } +int clk_set_parent(struct clk *clk, struct clk *parent) +{ + const struct clk_ops *ops = clk_dev_ops(clk->dev); + + debug("%s(clk=%p, parent=%p)\n", __func__, clk, parent); + + if (!ops->set_parent) + return -ENOSYS; + + return ops->set_parent(clk, parent); +} + int clk_enable(struct clk *clk) { - struct clk_ops *ops = clk_dev_ops(clk->dev); + const struct clk_ops *ops = clk_dev_ops(clk->dev); debug("%s(clk=%p)\n", __func__, clk); @@ -204,7 +338,7 @@ int clk_enable(struct clk *clk) int clk_disable(struct clk *clk) { - struct clk_ops *ops = clk_dev_ops(clk->dev); + const struct clk_ops *ops = clk_dev_ops(clk->dev); debug("%s(clk=%p)\n", __func__, clk);