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/bootmem.h>
27 #include <linux/device.h>
32 #define pr_fmt(fmt) "%s: " fmt, __func__
34 struct ti_clk_ll_ops *ti_clk_ll_ops;
35 static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
37 static struct ti_clk_features ti_clk_features;
40 struct regmap *regmap;
44 static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
46 static void clk_memmap_writel(u32 val, const struct clk_omap_reg *reg)
48 struct clk_iomap *io = clk_memmaps[reg->index];
51 writel_relaxed(val, reg->ptr);
53 regmap_write(io->regmap, reg->offset, val);
55 writel_relaxed(val, io->mem + reg->offset);
58 static void _clk_rmw(u32 val, u32 mask, void __iomem *ptr)
62 v = readl_relaxed(ptr);
65 writel_relaxed(v, ptr);
68 static void clk_memmap_rmw(u32 val, u32 mask, const struct clk_omap_reg *reg)
70 struct clk_iomap *io = clk_memmaps[reg->index];
73 _clk_rmw(val, mask, reg->ptr);
74 } else if (io->regmap) {
75 regmap_update_bits(io->regmap, reg->offset, mask, val);
77 _clk_rmw(val, mask, io->mem + reg->offset);
81 static u32 clk_memmap_readl(const struct clk_omap_reg *reg)
84 struct clk_iomap *io = clk_memmaps[reg->index];
87 val = readl_relaxed(reg->ptr);
89 regmap_read(io->regmap, reg->offset, &val);
91 val = readl_relaxed(io->mem + reg->offset);
97 * ti_clk_setup_ll_ops - setup low level clock operations
98 * @ops: low level clock ops descriptor
100 * Sets up low level clock operations for TI clock driver. This is used
101 * to provide various callbacks for the clock driver towards platform
102 * specific code. Returns 0 on success, -EBUSY if ll_ops have been
103 * registered already.
105 int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
108 pr_err("Attempt to register ll_ops multiple times.\n");
113 ops->clk_readl = clk_memmap_readl;
114 ops->clk_writel = clk_memmap_writel;
115 ops->clk_rmw = clk_memmap_rmw;
121 * ti_dt_clocks_register - register DT alias clocks during boot
122 * @oclks: list of clocks to register
124 * Register alias or non-standard DT clock entries during boot. By
125 * default, DT clocks are found based on their node name. If any
126 * additional con-id / dev-id -> clock mapping is required, use this
127 * function to list these.
129 void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
132 struct device_node *node;
134 struct of_phandle_args clkspec;
141 static bool clkctrl_nodes_missing;
142 static bool has_clkctrl_data;
144 for (c = oclks; c->node_name != NULL; c++) {
145 strcpy(buf, c->node_name);
147 for (i = 0; i < 2; i++)
153 pr_warn("Bad number of tags on %s\n",
157 tags[num_args++] = ptr + 1;
163 if (num_args && clkctrl_nodes_missing)
166 node = of_find_node_by_name(NULL, buf);
168 node = of_find_node_by_name(node, "clk");
170 clkspec.args_count = num_args;
171 for (i = 0; i < num_args; i++) {
172 ret = kstrtoint(tags[i], i ? 10 : 16, clkspec.args + i);
174 pr_warn("Bad tag in %s at %d: %s\n",
175 c->node_name, i, tags[i]);
179 clk = of_clk_get_from_provider(&clkspec);
185 if (num_args && !has_clkctrl_data) {
186 if (of_find_compatible_node(NULL, NULL,
188 has_clkctrl_data = true;
190 clkctrl_nodes_missing = true;
192 pr_warn("missing clkctrl nodes, please update your dts.\n");
197 pr_warn("failed to lookup clock node %s, ret=%ld\n",
198 c->node_name, PTR_ERR(clk));
203 struct clk_init_item {
204 struct device_node *node;
206 ti_of_clk_init_cb_t func;
207 struct list_head link;
210 static LIST_HEAD(retry_list);
213 * ti_clk_retry_init - retries a failed clock init at later phase
214 * @node: device not for the clock
215 * @user: user data pointer
216 * @func: init function to be called for the clock
218 * Adds a failed clock init to the retry list. The retry list is parsed
219 * once all the other clocks have been initialized.
221 int __init ti_clk_retry_init(struct device_node *node, void *user,
222 ti_of_clk_init_cb_t func)
224 struct clk_init_item *retry;
226 pr_debug("%pOFn: adding to retry list...\n", node);
227 retry = kzalloc(sizeof(*retry), GFP_KERNEL);
234 list_add(&retry->link, &retry_list);
240 * ti_clk_get_reg_addr - get register address for a clock register
241 * @node: device node for the clock
242 * @index: register index from the clock node
243 * @reg: pointer to target register struct
245 * Builds clock register address from device tree information, and returns
246 * the data via the provided output pointer @reg. Returns 0 on success,
247 * negative error value on failure.
249 int ti_clk_get_reg_addr(struct device_node *node, int index,
250 struct clk_omap_reg *reg)
255 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
256 if (clocks_node_ptr[i] == node->parent)
260 if (i == CLK_MAX_MEMMAPS) {
261 pr_err("clk-provider not found for %pOFn!\n", node);
267 if (of_property_read_u32_index(node, "reg", index, &val)) {
268 pr_err("%pOFn must have reg[%d]!\n", node, index);
278 void ti_clk_latch(struct clk_omap_reg *reg, s8 shift)
287 ti_clk_ll_ops->clk_rmw(latch, latch, reg);
288 ti_clk_ll_ops->clk_rmw(0, latch, reg);
289 ti_clk_ll_ops->clk_readl(reg); /* OCP barrier */
293 * omap2_clk_provider_init - init master clock provider
294 * @parent: master node
295 * @index: internal index for clk_reg_ops
296 * @syscon: syscon regmap pointer for accessing clock registers
297 * @mem: iomem pointer for the clock provider memory area, only used if
298 * syscon is not provided
300 * Initializes a master clock IP block. This basically sets up the
301 * mapping from clocks node to the memory map index. All the clocks
302 * are then initialized through the common of_clk_init call, and the
303 * clocks will access their memory maps based on the node layout.
304 * Returns 0 in success.
306 int __init omap2_clk_provider_init(struct device_node *parent, int index,
307 struct regmap *syscon, void __iomem *mem)
309 struct device_node *clocks;
310 struct clk_iomap *io;
312 /* get clocks for this parent */
313 clocks = of_get_child_by_name(parent, "clocks");
315 pr_err("%pOFn missing 'clocks' child node.\n", parent);
319 /* add clocks node info */
320 clocks_node_ptr[index] = clocks;
322 io = kzalloc(sizeof(*io), GFP_KERNEL);
329 clk_memmaps[index] = io;
335 * omap2_clk_legacy_provider_init - initialize a legacy clock provider
336 * @index: index for the clock provider
337 * @mem: iomem pointer for the clock provider memory area
339 * Initializes a legacy clock provider memory mapping.
341 void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
343 struct clk_iomap *io;
345 io = memblock_virt_alloc(sizeof(*io), 0);
349 clk_memmaps[index] = io;
353 * ti_dt_clk_init_retry_clks - init clocks from the retry list
355 * Initializes any clocks that have failed to initialize before,
356 * reasons being missing parent node(s) during earlier init. This
357 * typically happens only for DPLLs which need to have both of their
358 * parent clocks ready during init.
360 void ti_dt_clk_init_retry_clks(void)
362 struct clk_init_item *retry;
363 struct clk_init_item *tmp;
366 while (!list_empty(&retry_list) && retries) {
367 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
368 pr_debug("retry-init: %pOFn\n", retry->node);
369 retry->func(retry->user, retry->node);
370 list_del(&retry->link);
377 static const struct of_device_id simple_clk_match_table[] __initconst = {
378 { .compatible = "fixed-clock" },
379 { .compatible = "fixed-factor-clock" },
384 * ti_clk_add_aliases - setup clock aliases
386 * Sets up any missing clock aliases. No return value.
388 void __init ti_clk_add_aliases(void)
390 struct device_node *np;
393 for_each_matching_node(np, simple_clk_match_table) {
394 struct of_phandle_args clkspec;
397 clk = of_clk_get_from_provider(&clkspec);
399 ti_clk_add_alias(NULL, clk, np->name);
404 * ti_clk_setup_features - setup clock features flags
405 * @features: features definition to use
407 * Initializes the clock driver features flags based on platform
408 * provided data. No return value.
410 void __init ti_clk_setup_features(struct ti_clk_features *features)
412 memcpy(&ti_clk_features, features, sizeof(*features));
416 * ti_clk_get_features - get clock driver features flags
418 * Get TI clock driver features description. Returns a pointer
419 * to the current feature setup.
421 const struct ti_clk_features *ti_clk_get_features(void)
423 return &ti_clk_features;
427 * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
428 * @clk_names: ptr to an array of strings of clock names to enable
429 * @num_clocks: number of clock names in @clk_names
431 * Prepare and enable a list of clocks, named by @clk_names. No
432 * return value. XXX Deprecated; only needed until these clocks are
433 * properly claimed and enabled by the drivers or core code that uses
434 * them. XXX What code disables & calls clk_put on these clocks?
436 void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
438 struct clk *init_clk;
441 for (i = 0; i < num_clocks; i++) {
442 init_clk = clk_get(NULL, clk_names[i]);
443 if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
446 clk_prepare_enable(init_clk);
451 * ti_clk_add_alias - add a clock alias for a TI clock
452 * @dev: device alias for this clock
453 * @clk: clock handle to create alias for
454 * @con: connection ID for this clock
456 * Creates a clock alias for a TI clock. Allocates the clock lookup entry
457 * and assigns the data to it. Returns 0 if successful, negative error
460 int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con)
462 struct clk_lookup *cl;
470 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
475 cl->dev_id = dev_name(dev);
485 * ti_clk_register - register a TI clock to the common clock framework
486 * @dev: device for this clock
487 * @hw: hardware clock handle
488 * @con: connection ID for this clock
490 * Registers a TI clock to the common clock framework, and adds a clock
491 * alias for it. Returns a handle to the registered clock if successful,
492 * ERR_PTR value in failure.
494 struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
500 clk = clk_register(dev, hw);
504 ret = ti_clk_add_alias(dev, clk, con);