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.h>
19 #include <linux/clk-provider.h>
20 #include <linux/clkdev.h>
21 #include <linux/clk/ti.h>
23 #include <linux/of_address.h>
24 #include <linux/list.h>
25 #include <linux/regmap.h>
26 #include <linux/memblock.h>
27 #include <linux/device.h>
32 #define pr_fmt(fmt) "%s: " fmt, __func__
34 static LIST_HEAD(clk_hw_omap_clocks);
35 struct ti_clk_ll_ops *ti_clk_ll_ops;
36 static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
38 struct ti_clk_features ti_clk_features;
41 struct regmap *regmap;
45 static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
47 static void clk_memmap_writel(u32 val, const struct clk_omap_reg *reg)
49 struct clk_iomap *io = clk_memmaps[reg->index];
52 writel_relaxed(val, reg->ptr);
54 regmap_write(io->regmap, reg->offset, val);
56 writel_relaxed(val, io->mem + reg->offset);
59 static void _clk_rmw(u32 val, u32 mask, void __iomem *ptr)
63 v = readl_relaxed(ptr);
66 writel_relaxed(v, ptr);
69 static void clk_memmap_rmw(u32 val, u32 mask, const struct clk_omap_reg *reg)
71 struct clk_iomap *io = clk_memmaps[reg->index];
74 _clk_rmw(val, mask, reg->ptr);
75 } else if (io->regmap) {
76 regmap_update_bits(io->regmap, reg->offset, mask, val);
78 _clk_rmw(val, mask, io->mem + reg->offset);
82 static u32 clk_memmap_readl(const struct clk_omap_reg *reg)
85 struct clk_iomap *io = clk_memmaps[reg->index];
88 val = readl_relaxed(reg->ptr);
90 regmap_read(io->regmap, reg->offset, &val);
92 val = readl_relaxed(io->mem + reg->offset);
98 * ti_clk_setup_ll_ops - setup low level clock operations
99 * @ops: low level clock ops descriptor
101 * Sets up low level clock operations for TI clock driver. This is used
102 * to provide various callbacks for the clock driver towards platform
103 * specific code. Returns 0 on success, -EBUSY if ll_ops have been
104 * registered already.
106 int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
109 pr_err("Attempt to register ll_ops multiple times.\n");
114 ops->clk_readl = clk_memmap_readl;
115 ops->clk_writel = clk_memmap_writel;
116 ops->clk_rmw = clk_memmap_rmw;
122 * ti_dt_clocks_register - register DT alias clocks during boot
123 * @oclks: list of clocks to register
125 * Register alias or non-standard DT clock entries during boot. By
126 * default, DT clocks are found based on their node name. If any
127 * additional con-id / dev-id -> clock mapping is required, use this
128 * function to list these.
130 void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
133 struct device_node *node, *parent;
135 struct of_phandle_args clkspec;
142 static bool clkctrl_nodes_missing;
143 static bool has_clkctrl_data;
144 static bool compat_mode;
146 compat_mode = ti_clk_get_features()->flags & TI_CLK_CLKCTRL_COMPAT;
148 for (c = oclks; c->node_name != NULL; c++) {
149 strcpy(buf, c->node_name);
151 for (i = 0; i < 2; i++)
157 pr_warn("Bad number of tags on %s\n",
161 tags[num_args++] = ptr + 1;
167 if (num_args && clkctrl_nodes_missing)
170 node = of_find_node_by_name(NULL, buf);
171 if (num_args && compat_mode) {
173 node = of_get_child_by_name(parent, "clk");
178 clkspec.args_count = num_args;
179 for (i = 0; i < num_args; i++) {
180 ret = kstrtoint(tags[i], i ? 10 : 16, clkspec.args + i);
182 pr_warn("Bad tag in %s at %d: %s\n",
183 c->node_name, i, tags[i]);
188 clk = of_clk_get_from_provider(&clkspec);
194 if (num_args && !has_clkctrl_data) {
195 struct device_node *np;
197 np = of_find_compatible_node(NULL, NULL,
200 has_clkctrl_data = true;
203 clkctrl_nodes_missing = true;
205 pr_warn("missing clkctrl nodes, please update your dts.\n");
210 pr_warn("failed to lookup clock node %s, ret=%ld\n",
211 c->node_name, PTR_ERR(clk));
216 struct clk_init_item {
217 struct device_node *node;
219 ti_of_clk_init_cb_t func;
220 struct list_head link;
223 static LIST_HEAD(retry_list);
226 * ti_clk_retry_init - retries a failed clock init at later phase
227 * @node: device not for the clock
228 * @user: user data pointer
229 * @func: init function to be called for the clock
231 * Adds a failed clock init to the retry list. The retry list is parsed
232 * once all the other clocks have been initialized.
234 int __init ti_clk_retry_init(struct device_node *node, void *user,
235 ti_of_clk_init_cb_t func)
237 struct clk_init_item *retry;
239 pr_debug("%pOFn: adding to retry list...\n", node);
240 retry = kzalloc(sizeof(*retry), GFP_KERNEL);
247 list_add(&retry->link, &retry_list);
253 * ti_clk_get_reg_addr - get register address for a clock register
254 * @node: device node for the clock
255 * @index: register index from the clock node
256 * @reg: pointer to target register struct
258 * Builds clock register address from device tree information, and returns
259 * the data via the provided output pointer @reg. Returns 0 on success,
260 * negative error value on failure.
262 int ti_clk_get_reg_addr(struct device_node *node, int index,
263 struct clk_omap_reg *reg)
268 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
269 if (clocks_node_ptr[i] == node->parent)
273 if (i == CLK_MAX_MEMMAPS) {
274 pr_err("clk-provider not found for %pOFn!\n", node);
280 if (of_property_read_u32_index(node, "reg", index, &val)) {
281 pr_err("%pOFn must have reg[%d]!\n", node, index);
291 void ti_clk_latch(struct clk_omap_reg *reg, s8 shift)
300 ti_clk_ll_ops->clk_rmw(latch, latch, reg);
301 ti_clk_ll_ops->clk_rmw(0, latch, reg);
302 ti_clk_ll_ops->clk_readl(reg); /* OCP barrier */
306 * omap2_clk_provider_init - init master clock provider
307 * @parent: master node
308 * @index: internal index for clk_reg_ops
309 * @syscon: syscon regmap pointer for accessing clock registers
310 * @mem: iomem pointer for the clock provider memory area, only used if
311 * syscon is not provided
313 * Initializes a master clock IP block. This basically sets up the
314 * mapping from clocks node to the memory map index. All the clocks
315 * are then initialized through the common of_clk_init call, and the
316 * clocks will access their memory maps based on the node layout.
317 * Returns 0 in success.
319 int __init omap2_clk_provider_init(struct device_node *parent, int index,
320 struct regmap *syscon, void __iomem *mem)
322 struct device_node *clocks;
323 struct clk_iomap *io;
325 /* get clocks for this parent */
326 clocks = of_get_child_by_name(parent, "clocks");
328 pr_err("%pOFn missing 'clocks' child node.\n", parent);
332 /* add clocks node info */
333 clocks_node_ptr[index] = clocks;
335 io = kzalloc(sizeof(*io), GFP_KERNEL);
342 clk_memmaps[index] = io;
348 * omap2_clk_legacy_provider_init - initialize a legacy clock provider
349 * @index: index for the clock provider
350 * @mem: iomem pointer for the clock provider memory area
352 * Initializes a legacy clock provider memory mapping.
354 void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
356 struct clk_iomap *io;
358 io = memblock_alloc(sizeof(*io), SMP_CACHE_BYTES);
360 panic("%s: Failed to allocate %zu bytes\n", __func__,
365 clk_memmaps[index] = io;
369 * ti_dt_clk_init_retry_clks - init clocks from the retry list
371 * Initializes any clocks that have failed to initialize before,
372 * reasons being missing parent node(s) during earlier init. This
373 * typically happens only for DPLLs which need to have both of their
374 * parent clocks ready during init.
376 void ti_dt_clk_init_retry_clks(void)
378 struct clk_init_item *retry;
379 struct clk_init_item *tmp;
382 while (!list_empty(&retry_list) && retries) {
383 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
384 pr_debug("retry-init: %pOFn\n", retry->node);
385 retry->func(retry->user, retry->node);
386 list_del(&retry->link);
393 static const struct of_device_id simple_clk_match_table[] __initconst = {
394 { .compatible = "fixed-clock" },
395 { .compatible = "fixed-factor-clock" },
400 * ti_clk_add_aliases - setup clock aliases
402 * Sets up any missing clock aliases. No return value.
404 void __init ti_clk_add_aliases(void)
406 struct device_node *np;
409 for_each_matching_node(np, simple_clk_match_table) {
410 struct of_phandle_args clkspec;
413 clk = of_clk_get_from_provider(&clkspec);
415 ti_clk_add_alias(NULL, clk, np->name);
420 * ti_clk_setup_features - setup clock features flags
421 * @features: features definition to use
423 * Initializes the clock driver features flags based on platform
424 * provided data. No return value.
426 void __init ti_clk_setup_features(struct ti_clk_features *features)
428 memcpy(&ti_clk_features, features, sizeof(*features));
432 * ti_clk_get_features - get clock driver features flags
434 * Get TI clock driver features description. Returns a pointer
435 * to the current feature setup.
437 const struct ti_clk_features *ti_clk_get_features(void)
439 return &ti_clk_features;
443 * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
444 * @clk_names: ptr to an array of strings of clock names to enable
445 * @num_clocks: number of clock names in @clk_names
447 * Prepare and enable a list of clocks, named by @clk_names. No
448 * return value. XXX Deprecated; only needed until these clocks are
449 * properly claimed and enabled by the drivers or core code that uses
450 * them. XXX What code disables & calls clk_put on these clocks?
452 void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
454 struct clk *init_clk;
457 for (i = 0; i < num_clocks; i++) {
458 init_clk = clk_get(NULL, clk_names[i]);
459 if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
462 clk_prepare_enable(init_clk);
467 * ti_clk_add_alias - add a clock alias for a TI clock
468 * @dev: device alias for this clock
469 * @clk: clock handle to create alias for
470 * @con: connection ID for this clock
472 * Creates a clock alias for a TI clock. Allocates the clock lookup entry
473 * and assigns the data to it. Returns 0 if successful, negative error
476 int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con)
478 struct clk_lookup *cl;
486 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
491 cl->dev_id = dev_name(dev);
501 * ti_clk_register - register a TI clock to the common clock framework
502 * @dev: device for this clock
503 * @hw: hardware clock handle
504 * @con: connection ID for this clock
506 * Registers a TI clock to the common clock framework, and adds a clock
507 * alias for it. Returns a handle to the registered clock if successful,
508 * ERR_PTR value in failure.
510 struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
516 clk = clk_register(dev, hw);
520 ret = ti_clk_add_alias(dev, clk, con);
530 * ti_clk_register_omap_hw - register a clk_hw_omap to the clock framework
531 * @dev: device for this clock
532 * @hw: hardware clock handle
533 * @con: connection ID for this clock
535 * Registers a clk_hw_omap clock to the clock framewor, adds a clock alias
536 * for it, and adds the list to the available clk_hw_omap type clocks.
537 * Returns a handle to the registered clock if successful, ERR_PTR value
540 struct clk *ti_clk_register_omap_hw(struct device *dev, struct clk_hw *hw,
544 struct clk_hw_omap *oclk;
546 clk = ti_clk_register(dev, hw, con);
550 oclk = to_clk_hw_omap(hw);
552 list_add(&oclk->node, &clk_hw_omap_clocks);
558 * omap2_clk_for_each - call function for each registered clk_hw_omap
559 * @fn: pointer to a callback function
561 * Call @fn for each registered clk_hw_omap, passing @hw to each
562 * function. @fn must return 0 for success or any other value for
563 * failure. If @fn returns non-zero, the iteration across clocks
564 * will stop and the non-zero return value will be passed to the
565 * caller of omap2_clk_for_each().
567 int omap2_clk_for_each(int (*fn)(struct clk_hw_omap *hw))
570 struct clk_hw_omap *hw;
572 list_for_each_entry(hw, &clk_hw_omap_clocks, node) {
582 * omap2_clk_is_hw_omap - check if the provided clk_hw is OMAP clock
583 * @hw: clk_hw to check if it is an omap clock or not
585 * Checks if the provided clk_hw is OMAP clock or not. Returns true if
586 * it is, false otherwise.
588 bool omap2_clk_is_hw_omap(struct clk_hw *hw)
590 struct clk_hw_omap *oclk;
592 list_for_each_entry(oclk, &clk_hw_omap_clocks, node) {