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. Returns a pointer to the register
107 * address, or a pointer error value in failure.
109 void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
111 struct clk_omap_reg *reg;
116 reg = (struct clk_omap_reg *)&tmp;
118 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
119 if (clocks_node_ptr[i] == node->parent)
123 if (i == CLK_MAX_MEMMAPS) {
124 pr_err("clk-provider not found for %s!\n", node->name);
125 return ERR_PTR(-ENOENT);
130 if (of_property_read_u32_index(node, "reg", index, &val)) {
131 pr_err("%s must have reg[%d]!\n", node->name, index);
132 return ERR_PTR(-EINVAL);
137 return (void __iomem *)tmp;
141 * ti_dt_clk_init_provider - init master clock provider
142 * @parent: master node
143 * @index: internal index for clk_reg_ops
145 * Initializes a master clock IP block. This basically sets up the
146 * mapping from clocks node to the memory map index. All the clocks
147 * are then initialized through the common of_clk_init call, and the
148 * clocks will access their memory maps based on the node layout.
150 void ti_dt_clk_init_provider(struct device_node *parent, int index)
152 struct device_node *clocks;
154 /* get clocks for this parent */
155 clocks = of_get_child_by_name(parent, "clocks");
157 pr_err("%s missing 'clocks' child node.\n", parent->name);
161 /* add clocks node info */
162 clocks_node_ptr[index] = clocks;
166 * ti_dt_clk_init_retry_clks - init clocks from the retry list
168 * Initializes any clocks that have failed to initialize before,
169 * reasons being missing parent node(s) during earlier init. This
170 * typically happens only for DPLLs which need to have both of their
171 * parent clocks ready during init.
173 void ti_dt_clk_init_retry_clks(void)
175 struct clk_init_item *retry;
176 struct clk_init_item *tmp;
179 while (!list_empty(&retry_list) && retries) {
180 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
181 pr_debug("retry-init: %s\n", retry->node->name);
182 retry->func(retry->hw, retry->node);
183 list_del(&retry->link);
190 #if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
191 void __init ti_clk_patch_legacy_clks(struct ti_clk **patch)
194 memcpy((*patch)->patch, *patch, sizeof(**patch));
199 struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
202 struct ti_clk_fixed *fixed;
203 struct ti_clk_fixed_factor *fixed_factor;
204 struct clk_hw *clk_hw;
209 switch (setup->type) {
213 clk = clk_register_fixed_rate(NULL, setup->name, NULL,
214 CLK_IS_ROOT, fixed->frequency);
217 clk = ti_clk_register_mux(setup);
220 clk = ti_clk_register_divider(setup);
222 case TI_CLK_COMPOSITE:
223 clk = ti_clk_register_composite(setup);
225 case TI_CLK_FIXED_FACTOR:
226 fixed_factor = setup->data;
228 clk = clk_register_fixed_factor(NULL, setup->name,
229 fixed_factor->parent,
230 0, fixed_factor->mult,
234 clk = ti_clk_register_gate(setup);
237 clk = ti_clk_register_dpll(setup);
240 pr_err("bad type for %s!\n", setup->name);
241 clk = ERR_PTR(-EINVAL);
246 if (setup->clkdm_name) {
247 if (__clk_get_flags(clk) & CLK_IS_BASIC) {
248 pr_warn("can't setup clkdm for basic clk %s\n",
251 clk_hw = __clk_get_hw(clk);
252 to_clk_hw_omap(clk_hw)->clkdm_name =
254 omap2_init_clk_clkdm(clk_hw);
262 int __init ti_clk_register_legacy_clks(struct ti_clk_alias *clks)
266 struct ti_clk_alias *retry_clk;
267 struct ti_clk_alias *tmp;
270 clk = ti_clk_register_clk(clks->clk);
272 if (PTR_ERR(clk) == -EAGAIN) {
273 list_add(&clks->link, &retry_list);
275 pr_err("register for %s failed: %ld\n",
276 clks->clk->name, PTR_ERR(clk));
281 clkdev_add(&clks->lk);
288 while (!list_empty(&retry_list) && retry) {
290 list_for_each_entry_safe(retry_clk, tmp, &retry_list, link) {
291 pr_debug("retry-init: %s\n", retry_clk->clk->name);
292 clk = ti_clk_register_clk(retry_clk->clk);
294 if (PTR_ERR(clk) == -EAGAIN) {
297 pr_err("register for %s failed: %ld\n",
298 retry_clk->clk->name,
304 retry_clk->lk.clk = clk;
305 clkdev_add(&retry_clk->lk);
306 list_del(&retry_clk->link);