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819b4861c1
ti_dt_clk_init_provider() can now be used to initialize the contents of a single clock IP block. This parses all the clocks under the IP block and calls the corresponding init function for them. This patch also introduces a helper function for the TI clock drivers to get register info from DT and append the master IP info to this. Signed-off-by: Tero Kristo <t-kristo@ti.com> Acked-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
168 lines
4.3 KiB
C
168 lines
4.3 KiB
C
/*
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* TI clock support
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*
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* Copyright (C) 2013 Texas Instruments, Inc.
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*
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* Tero Kristo <t-kristo@ti.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/clk-provider.h>
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#include <linux/clkdev.h>
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#include <linux/clk/ti.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/list.h>
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#undef pr_fmt
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#define pr_fmt(fmt) "%s: " fmt, __func__
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static int ti_dt_clk_memmap_index;
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struct ti_clk_ll_ops *ti_clk_ll_ops;
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/**
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* ti_dt_clocks_register - register DT alias clocks during boot
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* @oclks: list of clocks to register
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*
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* Register alias or non-standard DT clock entries during boot. By
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* default, DT clocks are found based on their node name. If any
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* additional con-id / dev-id -> clock mapping is required, use this
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* function to list these.
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*/
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void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
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{
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struct ti_dt_clk *c;
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struct device_node *node;
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struct clk *clk;
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struct of_phandle_args clkspec;
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for (c = oclks; c->node_name != NULL; c++) {
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node = of_find_node_by_name(NULL, c->node_name);
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clkspec.np = node;
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clk = of_clk_get_from_provider(&clkspec);
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if (!IS_ERR(clk)) {
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c->lk.clk = clk;
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clkdev_add(&c->lk);
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} else {
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pr_warn("failed to lookup clock node %s\n",
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c->node_name);
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}
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}
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}
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struct clk_init_item {
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struct device_node *node;
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struct clk_hw *hw;
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ti_of_clk_init_cb_t func;
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struct list_head link;
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};
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static LIST_HEAD(retry_list);
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/**
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* ti_clk_retry_init - retries a failed clock init at later phase
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* @node: device not for the clock
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* @hw: partially initialized clk_hw struct for the clock
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* @func: init function to be called for the clock
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*
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* Adds a failed clock init to the retry list. The retry list is parsed
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* once all the other clocks have been initialized.
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*/
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int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
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ti_of_clk_init_cb_t func)
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{
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struct clk_init_item *retry;
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pr_debug("%s: adding to retry list...\n", node->name);
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retry = kzalloc(sizeof(*retry), GFP_KERNEL);
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if (!retry)
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return -ENOMEM;
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retry->node = node;
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retry->func = func;
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retry->hw = hw;
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list_add(&retry->link, &retry_list);
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return 0;
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}
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/**
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* ti_clk_get_reg_addr - get register address for a clock register
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* @node: device node for the clock
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* @index: register index from the clock node
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*
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* Builds clock register address from device tree information. This
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* is a struct of type clk_omap_reg.
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*/
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void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
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{
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struct clk_omap_reg *reg;
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u32 val;
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u32 tmp;
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reg = (struct clk_omap_reg *)&tmp;
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reg->index = ti_dt_clk_memmap_index;
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if (of_property_read_u32_index(node, "reg", index, &val)) {
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pr_err("%s must have reg[%d]!\n", node->name, index);
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return NULL;
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}
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reg->offset = val;
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return (void __iomem *)tmp;
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}
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/**
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* ti_dt_clk_init_provider - init master clock provider
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* @parent: master node
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* @index: internal index for clk_reg_ops
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*
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* Initializes a master clock IP block and its child clock nodes.
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* Regmap is provided for accessing the register space for the
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* IP block and all the clocks under it.
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*/
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void ti_dt_clk_init_provider(struct device_node *parent, int index)
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{
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const struct of_device_id *match;
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struct device_node *np;
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struct device_node *clocks;
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of_clk_init_cb_t clk_init_cb;
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struct clk_init_item *retry;
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struct clk_init_item *tmp;
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ti_dt_clk_memmap_index = index;
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/* get clocks for this parent */
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clocks = of_get_child_by_name(parent, "clocks");
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if (!clocks) {
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pr_err("%s missing 'clocks' child node.\n", parent->name);
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return;
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}
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for_each_child_of_node(clocks, np) {
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match = of_match_node(&__clk_of_table, np);
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if (!match)
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continue;
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clk_init_cb = (of_clk_init_cb_t)match->data;
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pr_debug("%s: initializing: %s\n", __func__, np->name);
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clk_init_cb(np);
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}
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list_for_each_entry_safe(retry, tmp, &retry_list, link) {
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pr_debug("retry-init: %s\n", retry->node->name);
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retry->func(retry->hw, retry->node);
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list_del(&retry->link);
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kfree(retry);
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}
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}
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