4 * Copyright (C) 2013 Texas Instruments, Inc.
6 * Tero Kristo <t-kristo@ti.com>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
12 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
13 * kind, whether express or implied; without even the implied warranty
14 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
18 #include <linux/clk-provider.h>
19 #include <linux/clkdev.h>
20 #include <linux/clk/ti.h>
22 #include <linux/of_address.h>
23 #include <linux/list.h>
28 #define pr_fmt(fmt) "%s: " fmt, __func__
30 struct ti_clk_ll_ops *ti_clk_ll_ops;
31 static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
34 * ti_dt_clocks_register - register DT alias clocks during boot
35 * @oclks: list of clocks to register
37 * Register alias or non-standard DT clock entries during boot. By
38 * default, DT clocks are found based on their node name. If any
39 * additional con-id / dev-id -> clock mapping is required, use this
40 * function to list these.
42 void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
45 struct device_node *node;
47 struct of_phandle_args clkspec;
49 for (c = oclks; c->node_name != NULL; c++) {
50 node = of_find_node_by_name(NULL, c->node_name);
52 clk = of_clk_get_from_provider(&clkspec);
58 pr_warn("failed to lookup clock node %s\n",
64 struct clk_init_item {
65 struct device_node *node;
67 ti_of_clk_init_cb_t func;
68 struct list_head link;
71 static LIST_HEAD(retry_list);
74 * ti_clk_retry_init - retries a failed clock init at later phase
75 * @node: device not for the clock
76 * @hw: partially initialized clk_hw struct for the clock
77 * @func: init function to be called for the clock
79 * Adds a failed clock init to the retry list. The retry list is parsed
80 * once all the other clocks have been initialized.
82 int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
83 ti_of_clk_init_cb_t func)
85 struct clk_init_item *retry;
87 pr_debug("%s: adding to retry list...\n", node->name);
88 retry = kzalloc(sizeof(*retry), GFP_KERNEL);
95 list_add(&retry->link, &retry_list);
101 * ti_clk_get_reg_addr - get register address for a clock register
102 * @node: device node for the clock
103 * @index: register index from the clock node
105 * Builds clock register address from device tree information. This
106 * is a struct of type clk_omap_reg.
108 void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
110 struct clk_omap_reg *reg;
115 reg = (struct clk_omap_reg *)&tmp;
117 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
118 if (clocks_node_ptr[i] == node->parent)
122 if (i == CLK_MAX_MEMMAPS) {
123 pr_err("clk-provider not found for %s!\n", node->name);
129 if (of_property_read_u32_index(node, "reg", index, &val)) {
130 pr_err("%s must have reg[%d]!\n", node->name, index);
136 return (void __iomem *)tmp;
140 * ti_dt_clk_init_provider - init master clock provider
141 * @parent: master node
142 * @index: internal index for clk_reg_ops
144 * Initializes a master clock IP block. This basically sets up the
145 * mapping from clocks node to the memory map index. All the clocks
146 * are then initialized through the common of_clk_init call, and the
147 * clocks will access their memory maps based on the node layout.
149 void ti_dt_clk_init_provider(struct device_node *parent, int index)
151 struct device_node *clocks;
153 /* get clocks for this parent */
154 clocks = of_get_child_by_name(parent, "clocks");
156 pr_err("%s missing 'clocks' child node.\n", parent->name);
160 /* add clocks node info */
161 clocks_node_ptr[index] = clocks;
165 * ti_dt_clk_init_retry_clks - init clocks from the retry list
167 * Initializes any clocks that have failed to initialize before,
168 * reasons being missing parent node(s) during earlier init. This
169 * typically happens only for DPLLs which need to have both of their
170 * parent clocks ready during init.
172 void ti_dt_clk_init_retry_clks(void)
174 struct clk_init_item *retry;
175 struct clk_init_item *tmp;
178 while (!list_empty(&retry_list) && retries) {
179 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
180 pr_debug("retry-init: %s\n", retry->node->name);
181 retry->func(retry->hw, retry->node);
182 list_del(&retry->link);
189 void __init ti_clk_patch_legacy_clks(struct ti_clk **patch)
192 memcpy((*patch)->patch, *patch, sizeof(**patch));
197 struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
200 struct ti_clk_fixed *fixed;
201 struct ti_clk_fixed_factor *fixed_factor;
202 struct clk_hw *clk_hw;
207 switch (setup->type) {
211 clk = clk_register_fixed_rate(NULL, setup->name, NULL,
212 CLK_IS_ROOT, fixed->frequency);
215 clk = ti_clk_register_mux(setup);
218 clk = ti_clk_register_divider(setup);
220 case TI_CLK_COMPOSITE:
221 clk = ti_clk_register_composite(setup);
223 case TI_CLK_FIXED_FACTOR:
224 fixed_factor = setup->data;
226 clk = clk_register_fixed_factor(NULL, setup->name,
227 fixed_factor->parent,
228 0, fixed_factor->mult,
232 clk = ti_clk_register_gate(setup);
235 clk = ti_clk_register_dpll(setup);
238 pr_err("bad type for %s!\n", setup->name);
239 clk = ERR_PTR(-EINVAL);
244 if (setup->clkdm_name) {
245 if (__clk_get_flags(clk) & CLK_IS_BASIC) {
246 pr_warn("can't setup clkdm for basic clk %s\n",
249 clk_hw = __clk_get_hw(clk);
250 to_clk_hw_omap(clk_hw)->clkdm_name =
252 omap2_init_clk_clkdm(clk_hw);
260 int __init ti_clk_register_legacy_clks(struct ti_clk_alias *clks)
264 struct ti_clk_alias *retry_clk;
265 struct ti_clk_alias *tmp;
268 clk = ti_clk_register_clk(clks->clk);
270 if (PTR_ERR(clk) == -EAGAIN) {
271 list_add(&clks->link, &retry_list);
273 pr_err("register for %s failed: %ld\n",
274 clks->clk->name, PTR_ERR(clk));
279 clkdev_add(&clks->lk);
286 while (!list_empty(&retry_list) && retry) {
288 list_for_each_entry_safe(retry_clk, tmp, &retry_list, link) {
289 pr_debug("retry-init: %s\n", retry_clk->clk->name);
290 clk = ti_clk_register_clk(retry_clk->clk);
292 if (PTR_ERR(clk) == -EAGAIN) {
295 pr_err("register for %s failed: %ld\n",
296 retry_clk->clk->name,
302 retry_clk->lk.clk = clk;
303 clkdev_add(&retry_clk->lk);
304 list_del(&retry_clk->link);