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1/*
2 * TI clock support
3 *
4 * Copyright (C) 2013 Texas Instruments, Inc.
5 *
6 * Tero Kristo <t-kristo@ti.com>
7 *
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.
11 *
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.
16 */
17
18#include <linux/clk.h>
19#include <linux/clk-provider.h>
20#include <linux/clkdev.h>
21#include <linux/clk/ti.h>
22#include <linux/of.h>
23#include <linux/of_address.h>
24#include <linux/list.h>
25#include <linux/regmap.h>
26#include <linux/bootmem.h>
27
28#include "clock.h"
29
30#undef pr_fmt
31#define pr_fmt(fmt) "%s: " fmt, __func__
32
33struct ti_clk_ll_ops *ti_clk_ll_ops;
34static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
35
36static struct ti_clk_features ti_clk_features;
37
38struct clk_iomap {
39 struct regmap *regmap;
40 void __iomem *mem;
41};
42
43static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
44
45static void clk_memmap_writel(u32 val, void __iomem *reg)
46{
47 struct clk_omap_reg *r = (struct clk_omap_reg *)®
48 struct clk_iomap *io = clk_memmaps[r->index];
49
50 if (io->regmap)
51 regmap_write(io->regmap, r->offset, val);
52 else
53 writel_relaxed(val, io->mem + r->offset);
54}
55
56static u32 clk_memmap_readl(void __iomem *reg)
57{
58 u32 val;
59 struct clk_omap_reg *r = (struct clk_omap_reg *)®
60 struct clk_iomap *io = clk_memmaps[r->index];
61
62 if (io->regmap)
63 regmap_read(io->regmap, r->offset, &val);
64 else
65 val = readl_relaxed(io->mem + r->offset);
66
67 return val;
68}
69
70/**
71 * ti_clk_setup_ll_ops - setup low level clock operations
72 * @ops: low level clock ops descriptor
73 *
74 * Sets up low level clock operations for TI clock driver. This is used
75 * to provide various callbacks for the clock driver towards platform
76 * specific code. Returns 0 on success, -EBUSY if ll_ops have been
77 * registered already.
78 */
79int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
80{
81 if (ti_clk_ll_ops) {
82 pr_err("Attempt to register ll_ops multiple times.\n");
83 return -EBUSY;
84 }
85
86 ti_clk_ll_ops = ops;
87 ops->clk_readl = clk_memmap_readl;
88 ops->clk_writel = clk_memmap_writel;
89
90 return 0;
91}
92
93/**
94 * ti_dt_clocks_register - register DT alias clocks during boot
95 * @oclks: list of clocks to register
96 *
97 * Register alias or non-standard DT clock entries during boot. By
98 * default, DT clocks are found based on their node name. If any
99 * additional con-id / dev-id -> clock mapping is required, use this
100 * function to list these.
101 */
102void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
103{
104 struct ti_dt_clk *c;
105 struct device_node *node;
106 struct clk *clk;
107 struct of_phandle_args clkspec;
108
109 for (c = oclks; c->node_name != NULL; c++) {
110 node = of_find_node_by_name(NULL, c->node_name);
111 clkspec.np = node;
112 clk = of_clk_get_from_provider(&clkspec);
113
114 if (!IS_ERR(clk)) {
115 c->lk.clk = clk;
116 clkdev_add(&c->lk);
117 } else {
118 pr_warn("failed to lookup clock node %s\n",
119 c->node_name);
120 }
121 }
122}
123
124struct clk_init_item {
125 struct device_node *node;
126 struct clk_hw *hw;
127 ti_of_clk_init_cb_t func;
128 struct list_head link;
129};
130
131static LIST_HEAD(retry_list);
132
133/**
134 * ti_clk_retry_init - retries a failed clock init at later phase
135 * @node: device not for the clock
136 * @hw: partially initialized clk_hw struct for the clock
137 * @func: init function to be called for the clock
138 *
139 * Adds a failed clock init to the retry list. The retry list is parsed
140 * once all the other clocks have been initialized.
141 */
142int __init ti_clk_retry_init(struct device_node *node, struct clk_hw *hw,
143 ti_of_clk_init_cb_t func)
144{
145 struct clk_init_item *retry;
146
147 pr_debug("%s: adding to retry list...\n", node->name);
148 retry = kzalloc(sizeof(*retry), GFP_KERNEL);
149 if (!retry)
150 return -ENOMEM;
151
152 retry->node = node;
153 retry->func = func;
154 retry->hw = hw;
155 list_add(&retry->link, &retry_list);
156
157 return 0;
158}
159
160/**
161 * ti_clk_get_reg_addr - get register address for a clock register
162 * @node: device node for the clock
163 * @index: register index from the clock node
164 *
165 * Builds clock register address from device tree information. This
166 * is a struct of type clk_omap_reg. Returns a pointer to the register
167 * address, or a pointer error value in failure.
168 */
169void __iomem *ti_clk_get_reg_addr(struct device_node *node, int index)
170{
171 struct clk_omap_reg *reg;
172 u32 val;
173 u32 tmp;
174 int i;
175
176 reg = (struct clk_omap_reg *)&tmp;
177
178 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
179 if (clocks_node_ptr[i] == node->parent)
180 break;
181 }
182
183 if (i == CLK_MAX_MEMMAPS) {
184 pr_err("clk-provider not found for %s!\n", node->name);
185 return IOMEM_ERR_PTR(-ENOENT);
186 }
187
188 reg->index = i;
189
190 if (of_property_read_u32_index(node, "reg", index, &val)) {
191 pr_err("%s must have reg[%d]!\n", node->name, index);
192 return IOMEM_ERR_PTR(-EINVAL);
193 }
194
195 reg->offset = val;
196
197 return (__force void __iomem *)tmp;
198}
199
200/**
201 * omap2_clk_provider_init - init master clock provider
202 * @parent: master node
203 * @index: internal index for clk_reg_ops
204 * @syscon: syscon regmap pointer for accessing clock registers
205 * @mem: iomem pointer for the clock provider memory area, only used if
206 * syscon is not provided
207 *
208 * Initializes a master clock IP block. This basically sets up the
209 * mapping from clocks node to the memory map index. All the clocks
210 * are then initialized through the common of_clk_init call, and the
211 * clocks will access their memory maps based on the node layout.
212 * Returns 0 in success.
213 */
214int __init omap2_clk_provider_init(struct device_node *parent, int index,
215 struct regmap *syscon, void __iomem *mem)
216{
217 struct device_node *clocks;
218 struct clk_iomap *io;
219
220 /* get clocks for this parent */
221 clocks = of_get_child_by_name(parent, "clocks");
222 if (!clocks) {
223 pr_err("%s missing 'clocks' child node.\n", parent->name);
224 return -EINVAL;
225 }
226
227 /* add clocks node info */
228 clocks_node_ptr[index] = clocks;
229
230 io = kzalloc(sizeof(*io), GFP_KERNEL);
231 if (!io)
232 return -ENOMEM;
233
234 io->regmap = syscon;
235 io->mem = mem;
236
237 clk_memmaps[index] = io;
238
239 return 0;
240}
241
242/**
243 * omap2_clk_legacy_provider_init - initialize a legacy clock provider
244 * @index: index for the clock provider
245 * @mem: iomem pointer for the clock provider memory area
246 *
247 * Initializes a legacy clock provider memory mapping.
248 */
249void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
250{
251 struct clk_iomap *io;
252
253 io = memblock_virt_alloc(sizeof(*io), 0);
254
255 io->mem = mem;
256
257 clk_memmaps[index] = io;
258}
259
260/**
261 * ti_dt_clk_init_retry_clks - init clocks from the retry list
262 *
263 * Initializes any clocks that have failed to initialize before,
264 * reasons being missing parent node(s) during earlier init. This
265 * typically happens only for DPLLs which need to have both of their
266 * parent clocks ready during init.
267 */
268void ti_dt_clk_init_retry_clks(void)
269{
270 struct clk_init_item *retry;
271 struct clk_init_item *tmp;
272 int retries = 5;
273
274 while (!list_empty(&retry_list) && retries) {
275 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
276 pr_debug("retry-init: %s\n", retry->node->name);
277 retry->func(retry->hw, retry->node);
278 list_del(&retry->link);
279 kfree(retry);
280 }
281 retries--;
282 }
283}
284
285#if defined(CONFIG_ARCH_OMAP3) && defined(CONFIG_ATAGS)
286void __init ti_clk_patch_legacy_clks(struct ti_clk **patch)
287{
288 while (*patch) {
289 memcpy((*patch)->patch, *patch, sizeof(**patch));
290 patch++;
291 }
292}
293
294struct clk __init *ti_clk_register_clk(struct ti_clk *setup)
295{
296 struct clk *clk;
297 struct ti_clk_fixed *fixed;
298 struct ti_clk_fixed_factor *fixed_factor;
299 struct clk_hw *clk_hw;
300
301 if (setup->clk)
302 return setup->clk;
303
304 switch (setup->type) {
305 case TI_CLK_FIXED:
306 fixed = setup->data;
307
308 clk = clk_register_fixed_rate(NULL, setup->name, NULL, 0,
309 fixed->frequency);
310 break;
311 case TI_CLK_MUX:
312 clk = ti_clk_register_mux(setup);
313 break;
314 case TI_CLK_DIVIDER:
315 clk = ti_clk_register_divider(setup);
316 break;
317 case TI_CLK_COMPOSITE:
318 clk = ti_clk_register_composite(setup);
319 break;
320 case TI_CLK_FIXED_FACTOR:
321 fixed_factor = setup->data;
322
323 clk = clk_register_fixed_factor(NULL, setup->name,
324 fixed_factor->parent,
325 0, fixed_factor->mult,
326 fixed_factor->div);
327 break;
328 case TI_CLK_GATE:
329 clk = ti_clk_register_gate(setup);
330 break;
331 case TI_CLK_DPLL:
332 clk = ti_clk_register_dpll(setup);
333 break;
334 default:
335 pr_err("bad type for %s!\n", setup->name);
336 clk = ERR_PTR(-EINVAL);
337 }
338
339 if (!IS_ERR(clk)) {
340 setup->clk = clk;
341 if (setup->clkdm_name) {
342 clk_hw = __clk_get_hw(clk);
343 if (clk_hw_get_flags(clk_hw) & CLK_IS_BASIC) {
344 pr_warn("can't setup clkdm for basic clk %s\n",
345 setup->name);
346 } else {
347 to_clk_hw_omap(clk_hw)->clkdm_name =
348 setup->clkdm_name;
349 omap2_init_clk_clkdm(clk_hw);
350 }
351 }
352 }
353
354 return clk;
355}
356
357int __init ti_clk_register_legacy_clks(struct ti_clk_alias *clks)
358{
359 struct clk *clk;
360 bool retry;
361 struct ti_clk_alias *retry_clk;
362 struct ti_clk_alias *tmp;
363
364 while (clks->clk) {
365 clk = ti_clk_register_clk(clks->clk);
366 if (IS_ERR(clk)) {
367 if (PTR_ERR(clk) == -EAGAIN) {
368 list_add(&clks->link, &retry_list);
369 } else {
370 pr_err("register for %s failed: %ld\n",
371 clks->clk->name, PTR_ERR(clk));
372 return PTR_ERR(clk);
373 }
374 } else {
375 clks->lk.clk = clk;
376 clkdev_add(&clks->lk);
377 }
378 clks++;
379 }
380
381 retry = true;
382
383 while (!list_empty(&retry_list) && retry) {
384 retry = false;
385 list_for_each_entry_safe(retry_clk, tmp, &retry_list, link) {
386 pr_debug("retry-init: %s\n", retry_clk->clk->name);
387 clk = ti_clk_register_clk(retry_clk->clk);
388 if (IS_ERR(clk)) {
389 if (PTR_ERR(clk) == -EAGAIN) {
390 continue;
391 } else {
392 pr_err("register for %s failed: %ld\n",
393 retry_clk->clk->name,
394 PTR_ERR(clk));
395 return PTR_ERR(clk);
396 }
397 } else {
398 retry = true;
399 retry_clk->lk.clk = clk;
400 clkdev_add(&retry_clk->lk);
401 list_del(&retry_clk->link);
402 }
403 }
404 }
405
406 return 0;
407}
408#endif
409
410/**
411 * ti_clk_setup_features - setup clock features flags
412 * @features: features definition to use
413 *
414 * Initializes the clock driver features flags based on platform
415 * provided data. No return value.
416 */
417void __init ti_clk_setup_features(struct ti_clk_features *features)
418{
419 memcpy(&ti_clk_features, features, sizeof(*features));
420}
421
422/**
423 * ti_clk_get_features - get clock driver features flags
424 *
425 * Get TI clock driver features description. Returns a pointer
426 * to the current feature setup.
427 */
428const struct ti_clk_features *ti_clk_get_features(void)
429{
430 return &ti_clk_features;
431}
432
433/**
434 * omap2_clk_enable_init_clocks - prepare & enable a list of clocks
435 * @clk_names: ptr to an array of strings of clock names to enable
436 * @num_clocks: number of clock names in @clk_names
437 *
438 * Prepare and enable a list of clocks, named by @clk_names. No
439 * return value. XXX Deprecated; only needed until these clocks are
440 * properly claimed and enabled by the drivers or core code that uses
441 * them. XXX What code disables & calls clk_put on these clocks?
442 */
443void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
444{
445 struct clk *init_clk;
446 int i;
447
448 for (i = 0; i < num_clocks; i++) {
449 init_clk = clk_get(NULL, clk_names[i]);
450 if (WARN(IS_ERR(init_clk), "could not find init clock %s\n",
451 clk_names[i]))
452 continue;
453 clk_prepare_enable(init_clk);
454 }
455}
1/*
2 * TI clock support
3 *
4 * Copyright (C) 2013 Texas Instruments, Inc.
5 *
6 * Tero Kristo <t-kristo@ti.com>
7 *
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.
11 *
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.
16 */
17
18#include <linux/clk.h>
19#include <linux/clk-provider.h>
20#include <linux/clkdev.h>
21#include <linux/clk/ti.h>
22#include <linux/of.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>
28
29#include "clock.h"
30
31#undef pr_fmt
32#define pr_fmt(fmt) "%s: " fmt, __func__
33
34struct ti_clk_ll_ops *ti_clk_ll_ops;
35static struct device_node *clocks_node_ptr[CLK_MAX_MEMMAPS];
36
37static struct ti_clk_features ti_clk_features;
38
39struct clk_iomap {
40 struct regmap *regmap;
41 void __iomem *mem;
42};
43
44static struct clk_iomap *clk_memmaps[CLK_MAX_MEMMAPS];
45
46static void clk_memmap_writel(u32 val, const struct clk_omap_reg *reg)
47{
48 struct clk_iomap *io = clk_memmaps[reg->index];
49
50 if (reg->ptr)
51 writel_relaxed(val, reg->ptr);
52 else if (io->regmap)
53 regmap_write(io->regmap, reg->offset, val);
54 else
55 writel_relaxed(val, io->mem + reg->offset);
56}
57
58static void _clk_rmw(u32 val, u32 mask, void __iomem *ptr)
59{
60 u32 v;
61
62 v = readl_relaxed(ptr);
63 v &= ~mask;
64 v |= val;
65 writel_relaxed(v, ptr);
66}
67
68static void clk_memmap_rmw(u32 val, u32 mask, const struct clk_omap_reg *reg)
69{
70 struct clk_iomap *io = clk_memmaps[reg->index];
71
72 if (reg->ptr) {
73 _clk_rmw(val, mask, reg->ptr);
74 } else if (io->regmap) {
75 regmap_update_bits(io->regmap, reg->offset, mask, val);
76 } else {
77 _clk_rmw(val, mask, io->mem + reg->offset);
78 }
79}
80
81static u32 clk_memmap_readl(const struct clk_omap_reg *reg)
82{
83 u32 val;
84 struct clk_iomap *io = clk_memmaps[reg->index];
85
86 if (reg->ptr)
87 val = readl_relaxed(reg->ptr);
88 else if (io->regmap)
89 regmap_read(io->regmap, reg->offset, &val);
90 else
91 val = readl_relaxed(io->mem + reg->offset);
92
93 return val;
94}
95
96/**
97 * ti_clk_setup_ll_ops - setup low level clock operations
98 * @ops: low level clock ops descriptor
99 *
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.
104 */
105int ti_clk_setup_ll_ops(struct ti_clk_ll_ops *ops)
106{
107 if (ti_clk_ll_ops) {
108 pr_err("Attempt to register ll_ops multiple times.\n");
109 return -EBUSY;
110 }
111
112 ti_clk_ll_ops = ops;
113 ops->clk_readl = clk_memmap_readl;
114 ops->clk_writel = clk_memmap_writel;
115 ops->clk_rmw = clk_memmap_rmw;
116
117 return 0;
118}
119
120/**
121 * ti_dt_clocks_register - register DT alias clocks during boot
122 * @oclks: list of clocks to register
123 *
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.
128 */
129void __init ti_dt_clocks_register(struct ti_dt_clk oclks[])
130{
131 struct ti_dt_clk *c;
132 struct device_node *node;
133 struct clk *clk;
134 struct of_phandle_args clkspec;
135 char buf[64];
136 char *ptr;
137 char *tags[2];
138 int i;
139 int num_args;
140 int ret;
141 static bool clkctrl_nodes_missing;
142 static bool has_clkctrl_data;
143
144 for (c = oclks; c->node_name != NULL; c++) {
145 strcpy(buf, c->node_name);
146 ptr = buf;
147 for (i = 0; i < 2; i++)
148 tags[i] = NULL;
149 num_args = 0;
150 while (*ptr) {
151 if (*ptr == ':') {
152 if (num_args >= 2) {
153 pr_warn("Bad number of tags on %s\n",
154 c->node_name);
155 return;
156 }
157 tags[num_args++] = ptr + 1;
158 *ptr = 0;
159 }
160 ptr++;
161 }
162
163 if (num_args && clkctrl_nodes_missing)
164 continue;
165
166 node = of_find_node_by_name(NULL, buf);
167 if (num_args)
168 node = of_find_node_by_name(node, "clk");
169 clkspec.np = node;
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);
173 if (ret) {
174 pr_warn("Bad tag in %s at %d: %s\n",
175 c->node_name, i, tags[i]);
176 return;
177 }
178 }
179 clk = of_clk_get_from_provider(&clkspec);
180
181 if (!IS_ERR(clk)) {
182 c->lk.clk = clk;
183 clkdev_add(&c->lk);
184 } else {
185 if (num_args && !has_clkctrl_data) {
186 if (of_find_compatible_node(NULL, NULL,
187 "ti,clkctrl")) {
188 has_clkctrl_data = true;
189 } else {
190 clkctrl_nodes_missing = true;
191
192 pr_warn("missing clkctrl nodes, please update your dts.\n");
193 continue;
194 }
195 }
196
197 pr_warn("failed to lookup clock node %s, ret=%ld\n",
198 c->node_name, PTR_ERR(clk));
199 }
200 }
201}
202
203struct clk_init_item {
204 struct device_node *node;
205 void *user;
206 ti_of_clk_init_cb_t func;
207 struct list_head link;
208};
209
210static LIST_HEAD(retry_list);
211
212/**
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
217 *
218 * Adds a failed clock init to the retry list. The retry list is parsed
219 * once all the other clocks have been initialized.
220 */
221int __init ti_clk_retry_init(struct device_node *node, void *user,
222 ti_of_clk_init_cb_t func)
223{
224 struct clk_init_item *retry;
225
226 pr_debug("%s: adding to retry list...\n", node->name);
227 retry = kzalloc(sizeof(*retry), GFP_KERNEL);
228 if (!retry)
229 return -ENOMEM;
230
231 retry->node = node;
232 retry->func = func;
233 retry->user = user;
234 list_add(&retry->link, &retry_list);
235
236 return 0;
237}
238
239/**
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
244 *
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.
248 */
249int ti_clk_get_reg_addr(struct device_node *node, int index,
250 struct clk_omap_reg *reg)
251{
252 u32 val;
253 int i;
254
255 for (i = 0; i < CLK_MAX_MEMMAPS; i++) {
256 if (clocks_node_ptr[i] == node->parent)
257 break;
258 }
259
260 if (i == CLK_MAX_MEMMAPS) {
261 pr_err("clk-provider not found for %s!\n", node->name);
262 return -ENOENT;
263 }
264
265 reg->index = i;
266
267 if (of_property_read_u32_index(node, "reg", index, &val)) {
268 pr_err("%s must have reg[%d]!\n", node->name, index);
269 return -EINVAL;
270 }
271
272 reg->offset = val;
273 reg->ptr = NULL;
274
275 return 0;
276}
277
278void ti_clk_latch(struct clk_omap_reg *reg, s8 shift)
279{
280 u32 latch;
281
282 if (shift < 0)
283 return;
284
285 latch = 1 << shift;
286
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 */
290}
291
292/**
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
299 *
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.
305 */
306int __init omap2_clk_provider_init(struct device_node *parent, int index,
307 struct regmap *syscon, void __iomem *mem)
308{
309 struct device_node *clocks;
310 struct clk_iomap *io;
311
312 /* get clocks for this parent */
313 clocks = of_get_child_by_name(parent, "clocks");
314 if (!clocks) {
315 pr_err("%s missing 'clocks' child node.\n", parent->name);
316 return -EINVAL;
317 }
318
319 /* add clocks node info */
320 clocks_node_ptr[index] = clocks;
321
322 io = kzalloc(sizeof(*io), GFP_KERNEL);
323 if (!io)
324 return -ENOMEM;
325
326 io->regmap = syscon;
327 io->mem = mem;
328
329 clk_memmaps[index] = io;
330
331 return 0;
332}
333
334/**
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
338 *
339 * Initializes a legacy clock provider memory mapping.
340 */
341void __init omap2_clk_legacy_provider_init(int index, void __iomem *mem)
342{
343 struct clk_iomap *io;
344
345 io = memblock_virt_alloc(sizeof(*io), 0);
346
347 io->mem = mem;
348
349 clk_memmaps[index] = io;
350}
351
352/**
353 * ti_dt_clk_init_retry_clks - init clocks from the retry list
354 *
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.
359 */
360void ti_dt_clk_init_retry_clks(void)
361{
362 struct clk_init_item *retry;
363 struct clk_init_item *tmp;
364 int retries = 5;
365
366 while (!list_empty(&retry_list) && retries) {
367 list_for_each_entry_safe(retry, tmp, &retry_list, link) {
368 pr_debug("retry-init: %s\n", retry->node->name);
369 retry->func(retry->user, retry->node);
370 list_del(&retry->link);
371 kfree(retry);
372 }
373 retries--;
374 }
375}
376
377static const struct of_device_id simple_clk_match_table[] __initconst = {
378 { .compatible = "fixed-clock" },
379 { .compatible = "fixed-factor-clock" },
380 { }
381};
382
383/**
384 * ti_clk_add_aliases - setup clock aliases
385 *
386 * Sets up any missing clock aliases. No return value.
387 */
388void __init ti_clk_add_aliases(void)
389{
390 struct device_node *np;
391 struct clk *clk;
392
393 for_each_matching_node(np, simple_clk_match_table) {
394 struct of_phandle_args clkspec;
395
396 clkspec.np = np;
397 clk = of_clk_get_from_provider(&clkspec);
398
399 ti_clk_add_alias(NULL, clk, np->name);
400 }
401}
402
403/**
404 * ti_clk_setup_features - setup clock features flags
405 * @features: features definition to use
406 *
407 * Initializes the clock driver features flags based on platform
408 * provided data. No return value.
409 */
410void __init ti_clk_setup_features(struct ti_clk_features *features)
411{
412 memcpy(&ti_clk_features, features, sizeof(*features));
413}
414
415/**
416 * ti_clk_get_features - get clock driver features flags
417 *
418 * Get TI clock driver features description. Returns a pointer
419 * to the current feature setup.
420 */
421const struct ti_clk_features *ti_clk_get_features(void)
422{
423 return &ti_clk_features;
424}
425
426/**
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
430 *
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?
435 */
436void omap2_clk_enable_init_clocks(const char **clk_names, u8 num_clocks)
437{
438 struct clk *init_clk;
439 int i;
440
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",
444 clk_names[i]))
445 continue;
446 clk_prepare_enable(init_clk);
447 }
448}
449
450/**
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
455 *
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
458 * value otherwise.
459 */
460int ti_clk_add_alias(struct device *dev, struct clk *clk, const char *con)
461{
462 struct clk_lookup *cl;
463
464 if (!clk)
465 return 0;
466
467 if (IS_ERR(clk))
468 return PTR_ERR(clk);
469
470 cl = kzalloc(sizeof(*cl), GFP_KERNEL);
471 if (!cl)
472 return -ENOMEM;
473
474 if (dev)
475 cl->dev_id = dev_name(dev);
476 cl->con_id = con;
477 cl->clk = clk;
478
479 clkdev_add(cl);
480
481 return 0;
482}
483
484/**
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
489 *
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.
493 */
494struct clk *ti_clk_register(struct device *dev, struct clk_hw *hw,
495 const char *con)
496{
497 struct clk *clk;
498 int ret;
499
500 clk = clk_register(dev, hw);
501 if (IS_ERR(clk))
502 return clk;
503
504 ret = ti_clk_add_alias(dev, clk, con);
505 if (ret) {
506 clk_unregister(clk);
507 return ERR_PTR(ret);
508 }
509
510 return clk;
511}