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inet: frag: enforce memory limits earlier
[linux/fpc-iii.git] / drivers / clk / clk-xgene.c
blobbc37030e38ba62833316302a383d86cdfd671921
1 /*
2 * clk-xgene.c - AppliedMicro X-Gene Clock Interface
3 *
4 * Copyright (c) 2013, Applied Micro Circuits Corporation
5 * Author: Loc Ho <lho@apm.com>
6 *
7 * This program is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU General Public License as
9 * published by the Free Software Foundation; either version 2 of
10 * the License, or (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
20 * MA 02111-1307 USA
21 *
22 */
23 #include <linux/module.h>
24 #include <linux/spinlock.h>
25 #include <linux/io.h>
26 #include <linux/of.h>
27 #include <linux/clkdev.h>
28 #include <linux/clk-provider.h>
29 #include <linux/of_address.h>
30
31 /* Register SCU_PCPPLL bit fields */
32 #define N_DIV_RD(src) ((src) & 0x000001ff)
33 #define SC_N_DIV_RD(src) ((src) & 0x0000007f)
34 #define SC_OUTDIV2(src) (((src) & 0x00000100) >> 8)
35
36 /* Register SCU_SOCPLL bit fields */
37 #define CLKR_RD(src) (((src) & 0x07000000)>>24)
38 #define CLKOD_RD(src) (((src) & 0x00300000)>>20)
39 #define REGSPEC_RESET_F1_MASK 0x00010000
40 #define CLKF_RD(src) (((src) & 0x000001ff))
41
42 #define XGENE_CLK_DRIVER_VER "0.1"
43
44 static DEFINE_SPINLOCK(clk_lock);
45
46 static inline u32 xgene_clk_read(void __iomem *csr)
47 {
48 return readl_relaxed(csr);
49 }
50
51 static inline void xgene_clk_write(u32 data, void __iomem *csr)
52 {
53 writel_relaxed(data, csr);
54 }
55
56 /* PLL Clock */
57 enum xgene_pll_type {
58 PLL_TYPE_PCP = 0,
59 PLL_TYPE_SOC = 1,
60 };
61
62 struct xgene_clk_pll {
63 struct clk_hw hw;
64 void __iomem *reg;
65 spinlock_t *lock;
66 u32 pll_offset;
67 enum xgene_pll_type type;
68 int version;
69 };
70
71 #define to_xgene_clk_pll(_hw) container_of(_hw, struct xgene_clk_pll, hw)
72
73 static int xgene_clk_pll_is_enabled(struct clk_hw *hw)
74 {
75 struct xgene_clk_pll *pllclk = to_xgene_clk_pll(hw);
76 u32 data;
77
78 data = xgene_clk_read(pllclk->reg + pllclk->pll_offset);
79 pr_debug("%s pll %s\n", clk_hw_get_name(hw),
80 data & REGSPEC_RESET_F1_MASK ? "disabled" : "enabled");
81
82 return data & REGSPEC_RESET_F1_MASK ? 0 : 1;
83 }
84
85 static unsigned long xgene_clk_pll_recalc_rate(struct clk_hw *hw,
86 unsigned long parent_rate)
87 {
88 struct xgene_clk_pll *pllclk = to_xgene_clk_pll(hw);
89 unsigned long fref;
90 unsigned long fvco;
91 u32 pll;
92 u32 nref;
93 u32 nout;
94 u32 nfb;
95
96 pll = xgene_clk_read(pllclk->reg + pllclk->pll_offset);
97
98 if (pllclk->version <= 1) {
99 if (pllclk->type == PLL_TYPE_PCP) {
100 /*
101 * PLL VCO = Reference clock * NF
102 * PCP PLL = PLL_VCO / 2
103 */
104 nout = 2;
105 fvco = parent_rate * (N_DIV_RD(pll) + 4);
106 } else {
107 /*
108 * Fref = Reference Clock / NREF;
109 * Fvco = Fref * NFB;
110 * Fout = Fvco / NOUT;
111 */
112 nref = CLKR_RD(pll) + 1;
113 nout = CLKOD_RD(pll) + 1;
114 nfb = CLKF_RD(pll);
115 fref = parent_rate / nref;
116 fvco = fref * nfb;
117 }
118 } else {
119 /*
120 * fvco = Reference clock * FBDIVC
121 * PLL freq = fvco / NOUT
122 */
123 nout = SC_OUTDIV2(pll) ? 2 : 3;
124 fvco = parent_rate * SC_N_DIV_RD(pll);
125 }
126 pr_debug("%s pll recalc rate %ld parent %ld version %d\n",
127 clk_hw_get_name(hw), fvco / nout, parent_rate,
128 pllclk->version);
129
130 return fvco / nout;
131 }
132
133 static const struct clk_ops xgene_clk_pll_ops = {
134 .is_enabled = xgene_clk_pll_is_enabled,
135 .recalc_rate = xgene_clk_pll_recalc_rate,
136 };
137
138 static struct clk *xgene_register_clk_pll(struct device *dev,
139 const char *name, const char *parent_name,
140 unsigned long flags, void __iomem *reg, u32 pll_offset,
141 u32 type, spinlock_t *lock, int version)
142 {
143 struct xgene_clk_pll *apmclk;
144 struct clk *clk;
145 struct clk_init_data init;
146
147 /* allocate the APM clock structure */
148 apmclk = kzalloc(sizeof(*apmclk), GFP_KERNEL);
149 if (!apmclk) {
150 pr_err("%s: could not allocate APM clk\n", __func__);
151 return ERR_PTR(-ENOMEM);
152 }
153
154 init.name = name;
155 init.ops = &xgene_clk_pll_ops;
156 init.flags = flags;
157 init.parent_names = parent_name ? &parent_name : NULL;
158 init.num_parents = parent_name ? 1 : 0;
159
160 apmclk->version = version;
161 apmclk->reg = reg;
162 apmclk->lock = lock;
163 apmclk->pll_offset = pll_offset;
164 apmclk->type = type;
165 apmclk->hw.init = &init;
166
167 /* Register the clock */
168 clk = clk_register(dev, &apmclk->hw);
169 if (IS_ERR(clk)) {
170 pr_err("%s: could not register clk %s\n", __func__, name);
171 kfree(apmclk);
172 return NULL;
173 }
174 return clk;
175 }
176
177 static int xgene_pllclk_version(struct device_node *np)
178 {
179 if (of_device_is_compatible(np, "apm,xgene-socpll-clock"))
180 return 1;
181 if (of_device_is_compatible(np, "apm,xgene-pcppll-clock"))
182 return 1;
183 return 2;
184 }
185
186 static void xgene_pllclk_init(struct device_node *np, enum xgene_pll_type pll_type)
187 {
188 const char *clk_name = np->full_name;
189 struct clk *clk;
190 void __iomem *reg;
191 int version = xgene_pllclk_version(np);
192
193 reg = of_iomap(np, 0);
194 if (reg == NULL) {
195 pr_err("Unable to map CSR register for %s\n", np->full_name);
196 return;
197 }
198 of_property_read_string(np, "clock-output-names", &clk_name);
199 clk = xgene_register_clk_pll(NULL,
200 clk_name, of_clk_get_parent_name(np, 0),
201 0, reg, 0, pll_type, &clk_lock,
202 version);
203 if (!IS_ERR(clk)) {
204 of_clk_add_provider(np, of_clk_src_simple_get, clk);
205 clk_register_clkdev(clk, clk_name, NULL);
206 pr_debug("Add %s clock PLL\n", clk_name);
207 }
208 }
209
210 static void xgene_socpllclk_init(struct device_node *np)
211 {
212 xgene_pllclk_init(np, PLL_TYPE_SOC);
213 }
214
215 static void xgene_pcppllclk_init(struct device_node *np)
216 {
217 xgene_pllclk_init(np, PLL_TYPE_PCP);
218 }
219
220 /**
221 * struct xgene_clk_pmd - PMD clock
222 *
223 * @hw: handle between common and hardware-specific interfaces
224 * @reg: register containing the fractional scale multiplier (scaler)
225 * @shift: shift to the unit bit field
226 * @denom: 1/denominator unit
227 * @lock: register lock
228 * Flags:
229 * XGENE_CLK_PMD_SCALE_INVERTED - By default the scaler is the value read
230 * from the register plus one. For example,
231 * 0 for (0 + 1) / denom,
232 * 1 for (1 + 1) / denom and etc.
233 * If this flag is set, it is
234 * 0 for (denom - 0) / denom,
235 * 1 for (denom - 1) / denom and etc.
236 *
237 */
238 struct xgene_clk_pmd {
239 struct clk_hw hw;
240 void __iomem *reg;
241 u8 shift;
242 u32 mask;
243 u64 denom;
244 u32 flags;
245 spinlock_t *lock;
246 };
247
248 #define to_xgene_clk_pmd(_hw) container_of(_hw, struct xgene_clk_pmd, hw)
249
250 #define XGENE_CLK_PMD_SCALE_INVERTED BIT(0)
251 #define XGENE_CLK_PMD_SHIFT 8
252 #define XGENE_CLK_PMD_WIDTH 3
253
254 static unsigned long xgene_clk_pmd_recalc_rate(struct clk_hw *hw,
255 unsigned long parent_rate)
256 {
257 struct xgene_clk_pmd *fd = to_xgene_clk_pmd(hw);
258 unsigned long flags = 0;
259 u64 ret, scale;
260 u32 val;
261
262 if (fd->lock)
263 spin_lock_irqsave(fd->lock, flags);
264 else
265 __acquire(fd->lock);
266
267 val = clk_readl(fd->reg);
268
269 if (fd->lock)
270 spin_unlock_irqrestore(fd->lock, flags);
271 else
272 __release(fd->lock);
273
274 ret = (u64)parent_rate;
275
276 scale = (val & fd->mask) >> fd->shift;
277 if (fd->flags & XGENE_CLK_PMD_SCALE_INVERTED)
278 scale = fd->denom - scale;
279 else
280 scale++;
281
282 /* freq = parent_rate * scaler / denom */
283 do_div(ret, fd->denom);
284 ret *= scale;
285 if (ret == 0)
286 ret = (u64)parent_rate;
287
288 return ret;
289 }
290
291 static long xgene_clk_pmd_round_rate(struct clk_hw *hw, unsigned long rate,
292 unsigned long *parent_rate)
293 {
294 struct xgene_clk_pmd *fd = to_xgene_clk_pmd(hw);
295 u64 ret, scale;
296
297 if (!rate || rate >= *parent_rate)
298 return *parent_rate;
299
300 /* freq = parent_rate * scaler / denom */
301 ret = rate * fd->denom;
302 scale = DIV_ROUND_UP_ULL(ret, *parent_rate);
303
304 ret = (u64)*parent_rate * scale;
305 do_div(ret, fd->denom);
306
307 return ret;
308 }
309
310 static int xgene_clk_pmd_set_rate(struct clk_hw *hw, unsigned long rate,
311 unsigned long parent_rate)
312 {
313 struct xgene_clk_pmd *fd = to_xgene_clk_pmd(hw);
314 unsigned long flags = 0;
315 u64 scale, ret;
316 u32 val;
317
318 /*
319 * Compute the scaler:
320 *
321 * freq = parent_rate * scaler / denom, or
322 * scaler = freq * denom / parent_rate
323 */
324 ret = rate * fd->denom;
325 scale = DIV_ROUND_UP_ULL(ret, (u64)parent_rate);
326
327 /* Check if inverted */
328 if (fd->flags & XGENE_CLK_PMD_SCALE_INVERTED)
329 scale = fd->denom - scale;
330 else
331 scale--;
332
333 if (fd->lock)
334 spin_lock_irqsave(fd->lock, flags);
335 else
336 __acquire(fd->lock);
337
338 val = clk_readl(fd->reg);
339 val &= ~fd->mask;
340 val |= (scale << fd->shift);
341 clk_writel(val, fd->reg);
342
343 if (fd->lock)
344 spin_unlock_irqrestore(fd->lock, flags);
345 else
346 __release(fd->lock);
347
348 return 0;
349 }
350
351 static const struct clk_ops xgene_clk_pmd_ops = {
352 .recalc_rate = xgene_clk_pmd_recalc_rate,
353 .round_rate = xgene_clk_pmd_round_rate,
354 .set_rate = xgene_clk_pmd_set_rate,
355 };
356
357 static struct clk *
358 xgene_register_clk_pmd(struct device *dev,
359 const char *name, const char *parent_name,
360 unsigned long flags, void __iomem *reg, u8 shift,
361 u8 width, u64 denom, u32 clk_flags, spinlock_t *lock)
362 {
363 struct xgene_clk_pmd *fd;
364 struct clk_init_data init;
365 struct clk *clk;
366
367 fd = kzalloc(sizeof(*fd), GFP_KERNEL);
368 if (!fd)
369 return ERR_PTR(-ENOMEM);
370
371 init.name = name;
372 init.ops = &xgene_clk_pmd_ops;
373 init.flags = flags;
374 init.parent_names = parent_name ? &parent_name : NULL;
375 init.num_parents = parent_name ? 1 : 0;
376
377 fd->reg = reg;
378 fd->shift = shift;
379 fd->mask = (BIT(width) - 1) << shift;
380 fd->denom = denom;
381 fd->flags = clk_flags;
382 fd->lock = lock;
383 fd->hw.init = &init;
384
385 clk = clk_register(dev, &fd->hw);
386 if (IS_ERR(clk)) {
387 pr_err("%s: could not register clk %s\n", __func__, name);
388 kfree(fd);
389 return NULL;
390 }
391
392 return clk;
393 }
394
395 static void xgene_pmdclk_init(struct device_node *np)
396 {
397 const char *clk_name = np->full_name;
398 void __iomem *csr_reg;
399 struct resource res;
400 struct clk *clk;
401 u64 denom;
402 u32 flags = 0;
403 int rc;
404
405 /* Check if the entry is disabled */
406 if (!of_device_is_available(np))
407 return;
408
409 /* Parse the DTS register for resource */
410 rc = of_address_to_resource(np, 0, &res);
411 if (rc != 0) {
412 pr_err("no DTS register for %s\n", np->full_name);
413 return;
414 }
415 csr_reg = of_iomap(np, 0);
416 if (!csr_reg) {
417 pr_err("Unable to map resource for %s\n", np->full_name);
418 return;
419 }
420 of_property_read_string(np, "clock-output-names", &clk_name);
421
422 denom = BIT(XGENE_CLK_PMD_WIDTH);
423 flags |= XGENE_CLK_PMD_SCALE_INVERTED;
424
425 clk = xgene_register_clk_pmd(NULL, clk_name,
426 of_clk_get_parent_name(np, 0), 0,
427 csr_reg, XGENE_CLK_PMD_SHIFT,
428 XGENE_CLK_PMD_WIDTH, denom,
429 flags, &clk_lock);
430 if (!IS_ERR(clk)) {
431 of_clk_add_provider(np, of_clk_src_simple_get, clk);
432 clk_register_clkdev(clk, clk_name, NULL);
433 pr_debug("Add %s clock\n", clk_name);
434 } else {
435 if (csr_reg)
436 iounmap(csr_reg);
437 }
438 }
439
440 /* IP Clock */
441 struct xgene_dev_parameters {
442 void __iomem *csr_reg; /* CSR for IP clock */
443 u32 reg_clk_offset; /* Offset to clock enable CSR */
444 u32 reg_clk_mask; /* Mask bit for clock enable */
445 u32 reg_csr_offset; /* Offset to CSR reset */
446 u32 reg_csr_mask; /* Mask bit for disable CSR reset */
447 void __iomem *divider_reg; /* CSR for divider */
448 u32 reg_divider_offset; /* Offset to divider register */
449 u32 reg_divider_shift; /* Bit shift to divider field */
450 u32 reg_divider_width; /* Width of the bit to divider field */
451 };
452
453 struct xgene_clk {
454 struct clk_hw hw;
455 spinlock_t *lock;
456 struct xgene_dev_parameters param;
457 };
458
459 #define to_xgene_clk(_hw) container_of(_hw, struct xgene_clk, hw)
460
461 static int xgene_clk_enable(struct clk_hw *hw)
462 {
463 struct xgene_clk *pclk = to_xgene_clk(hw);
464 unsigned long flags = 0;
465 u32 data;
466
467 if (pclk->lock)
468 spin_lock_irqsave(pclk->lock, flags);
469
470 if (pclk->param.csr_reg != NULL) {
471 pr_debug("%s clock enabled\n", clk_hw_get_name(hw));
472 /* First enable the clock */
473 data = xgene_clk_read(pclk->param.csr_reg +
474 pclk->param.reg_clk_offset);
475 data |= pclk->param.reg_clk_mask;
476 xgene_clk_write(data, pclk->param.csr_reg +
477 pclk->param.reg_clk_offset);
478 pr_debug("%s clk offset 0x%08X mask 0x%08X value 0x%08X\n",
479 clk_hw_get_name(hw),
480 pclk->param.reg_clk_offset, pclk->param.reg_clk_mask,
481 data);
482
483 /* Second enable the CSR */
484 data = xgene_clk_read(pclk->param.csr_reg +
485 pclk->param.reg_csr_offset);
486 data &= ~pclk->param.reg_csr_mask;
487 xgene_clk_write(data, pclk->param.csr_reg +
488 pclk->param.reg_csr_offset);
489 pr_debug("%s csr offset 0x%08X mask 0x%08X value 0x%08X\n",
490 clk_hw_get_name(hw),
491 pclk->param.reg_csr_offset, pclk->param.reg_csr_mask,
492 data);
493 }
494
495 if (pclk->lock)
496 spin_unlock_irqrestore(pclk->lock, flags);
497
498 return 0;
499 }
500
501 static void xgene_clk_disable(struct clk_hw *hw)
502 {
503 struct xgene_clk *pclk = to_xgene_clk(hw);
504 unsigned long flags = 0;
505 u32 data;
506
507 if (pclk->lock)
508 spin_lock_irqsave(pclk->lock, flags);
509
510 if (pclk->param.csr_reg != NULL) {
511 pr_debug("%s clock disabled\n", clk_hw_get_name(hw));
512 /* First put the CSR in reset */
513 data = xgene_clk_read(pclk->param.csr_reg +
514 pclk->param.reg_csr_offset);
515 data |= pclk->param.reg_csr_mask;
516 xgene_clk_write(data, pclk->param.csr_reg +
517 pclk->param.reg_csr_offset);
518
519 /* Second disable the clock */
520 data = xgene_clk_read(pclk->param.csr_reg +
521 pclk->param.reg_clk_offset);
522 data &= ~pclk->param.reg_clk_mask;
523 xgene_clk_write(data, pclk->param.csr_reg +
524 pclk->param.reg_clk_offset);
525 }
526
527 if (pclk->lock)
528 spin_unlock_irqrestore(pclk->lock, flags);
529 }
530
531 static int xgene_clk_is_enabled(struct clk_hw *hw)
532 {
533 struct xgene_clk *pclk = to_xgene_clk(hw);
534 u32 data = 0;
535
536 if (pclk->param.csr_reg != NULL) {
537 pr_debug("%s clock checking\n", clk_hw_get_name(hw));
538 data = xgene_clk_read(pclk->param.csr_reg +
539 pclk->param.reg_clk_offset);
540 pr_debug("%s clock is %s\n", clk_hw_get_name(hw),
541 data & pclk->param.reg_clk_mask ? "enabled" :
542 "disabled");
543 }
544
545 if (pclk->param.csr_reg == NULL)
546 return 1;
547 return data & pclk->param.reg_clk_mask ? 1 : 0;
548 }
549
550 static unsigned long xgene_clk_recalc_rate(struct clk_hw *hw,
551 unsigned long parent_rate)
552 {
553 struct xgene_clk *pclk = to_xgene_clk(hw);
554 u32 data;
555
556 if (pclk->param.divider_reg) {
557 data = xgene_clk_read(pclk->param.divider_reg +
558 pclk->param.reg_divider_offset);
559 data >>= pclk->param.reg_divider_shift;
560 data &= (1 << pclk->param.reg_divider_width) - 1;
561
562 pr_debug("%s clock recalc rate %ld parent %ld\n",
563 clk_hw_get_name(hw),
564 parent_rate / data, parent_rate);
565
566 return parent_rate / data;
567 } else {
568 pr_debug("%s clock recalc rate %ld parent %ld\n",
569 clk_hw_get_name(hw), parent_rate, parent_rate);
570 return parent_rate;
571 }
572 }
573
574 static int xgene_clk_set_rate(struct clk_hw *hw, unsigned long rate,
575 unsigned long parent_rate)
576 {
577 struct xgene_clk *pclk = to_xgene_clk(hw);
578 unsigned long flags = 0;
579 u32 data;
580 u32 divider;
581 u32 divider_save;
582
583 if (pclk->lock)
584 spin_lock_irqsave(pclk->lock, flags);
585
586 if (pclk->param.divider_reg) {
587 /* Let's compute the divider */
588 if (rate > parent_rate)
589 rate = parent_rate;
590 divider_save = divider = parent_rate / rate; /* Rounded down */
591 divider &= (1 << pclk->param.reg_divider_width) - 1;
592 divider <<= pclk->param.reg_divider_shift;
593
594 /* Set new divider */
595 data = xgene_clk_read(pclk->param.divider_reg +
596 pclk->param.reg_divider_offset);
597 data &= ~(((1 << pclk->param.reg_divider_width) - 1)
598 << pclk->param.reg_divider_shift);
599 data |= divider;
600 xgene_clk_write(data, pclk->param.divider_reg +
601 pclk->param.reg_divider_offset);
602 pr_debug("%s clock set rate %ld\n", clk_hw_get_name(hw),
603 parent_rate / divider_save);
604 } else {
605 divider_save = 1;
606 }
607
608 if (pclk->lock)
609 spin_unlock_irqrestore(pclk->lock, flags);
610
611 return parent_rate / divider_save;
612 }
613
614 static long xgene_clk_round_rate(struct clk_hw *hw, unsigned long rate,
615 unsigned long *prate)
616 {
617 struct xgene_clk *pclk = to_xgene_clk(hw);
618 unsigned long parent_rate = *prate;
619 u32 divider;
620
621 if (pclk->param.divider_reg) {
622 /* Let's compute the divider */
623 if (rate > parent_rate)
624 rate = parent_rate;
625 divider = parent_rate / rate; /* Rounded down */
626 } else {
627 divider = 1;
628 }
629
630 return parent_rate / divider;
631 }
632
633 static const struct clk_ops xgene_clk_ops = {
634 .enable = xgene_clk_enable,
635 .disable = xgene_clk_disable,
636 .is_enabled = xgene_clk_is_enabled,
637 .recalc_rate = xgene_clk_recalc_rate,
638 .set_rate = xgene_clk_set_rate,
639 .round_rate = xgene_clk_round_rate,
640 };
641
642 static struct clk *xgene_register_clk(struct device *dev,
643 const char *name, const char *parent_name,
644 struct xgene_dev_parameters *parameters, spinlock_t *lock)
645 {
646 struct xgene_clk *apmclk;
647 struct clk *clk;
648 struct clk_init_data init;
649 int rc;
650
651 /* allocate the APM clock structure */
652 apmclk = kzalloc(sizeof(*apmclk), GFP_KERNEL);
653 if (!apmclk) {
654 pr_err("%s: could not allocate APM clk\n", __func__);
655 return ERR_PTR(-ENOMEM);
656 }
657
658 init.name = name;
659 init.ops = &xgene_clk_ops;
660 init.flags = 0;
661 init.parent_names = parent_name ? &parent_name : NULL;
662 init.num_parents = parent_name ? 1 : 0;
663
664 apmclk->lock = lock;
665 apmclk->hw.init = &init;
666 apmclk->param = *parameters;
667
668 /* Register the clock */
669 clk = clk_register(dev, &apmclk->hw);
670 if (IS_ERR(clk)) {
671 pr_err("%s: could not register clk %s\n", __func__, name);
672 kfree(apmclk);
673 return clk;
674 }
675
676 /* Register the clock for lookup */
677 rc = clk_register_clkdev(clk, name, NULL);
678 if (rc != 0) {
679 pr_err("%s: could not register lookup clk %s\n",
680 __func__, name);
681 }
682 return clk;
683 }
684
685 static void __init xgene_devclk_init(struct device_node *np)
686 {
687 const char *clk_name = np->full_name;
688 struct clk *clk;
689 struct resource res;
690 int rc;
691 struct xgene_dev_parameters parameters;
692 int i;
693
694 /* Check if the entry is disabled */
695 if (!of_device_is_available(np))
696 return;
697
698 /* Parse the DTS register for resource */
699 parameters.csr_reg = NULL;
700 parameters.divider_reg = NULL;
701 for (i = 0; i < 2; i++) {
702 void __iomem *map_res;
703 rc = of_address_to_resource(np, i, &res);
704 if (rc != 0) {
705 if (i == 0) {
706 pr_err("no DTS register for %s\n",
707 np->full_name);
708 return;
709 }
710 break;
711 }
712 map_res = of_iomap(np, i);
713 if (map_res == NULL) {
714 pr_err("Unable to map resource %d for %s\n",
715 i, np->full_name);
716 goto err;
717 }
718 if (strcmp(res.name, "div-reg") == 0)
719 parameters.divider_reg = map_res;
720 else /* if (strcmp(res->name, "csr-reg") == 0) */
721 parameters.csr_reg = map_res;
722 }
723 if (of_property_read_u32(np, "csr-offset", &parameters.reg_csr_offset))
724 parameters.reg_csr_offset = 0;
725 if (of_property_read_u32(np, "csr-mask", &parameters.reg_csr_mask))
726 parameters.reg_csr_mask = 0xF;
727 if (of_property_read_u32(np, "enable-offset",
728 &parameters.reg_clk_offset))
729 parameters.reg_clk_offset = 0x8;
730 if (of_property_read_u32(np, "enable-mask", &parameters.reg_clk_mask))
731 parameters.reg_clk_mask = 0xF;
732 if (of_property_read_u32(np, "divider-offset",
733 &parameters.reg_divider_offset))
734 parameters.reg_divider_offset = 0;
735 if (of_property_read_u32(np, "divider-width",
736 &parameters.reg_divider_width))
737 parameters.reg_divider_width = 0;
738 if (of_property_read_u32(np, "divider-shift",
739 &parameters.reg_divider_shift))
740 parameters.reg_divider_shift = 0;
741 of_property_read_string(np, "clock-output-names", &clk_name);
742
743 clk = xgene_register_clk(NULL, clk_name,
744 of_clk_get_parent_name(np, 0), &parameters, &clk_lock);
745 if (IS_ERR(clk))
746 goto err;
747 pr_debug("Add %s clock\n", clk_name);
748 rc = of_clk_add_provider(np, of_clk_src_simple_get, clk);
749 if (rc != 0)
750 pr_err("%s: could register provider clk %s\n", __func__,
751 np->full_name);
752
753 return;
754
755 err:
756 if (parameters.csr_reg)
757 iounmap(parameters.csr_reg);
758 if (parameters.divider_reg)
759 iounmap(parameters.divider_reg);
760 }
761
762 CLK_OF_DECLARE(xgene_socpll_clock, "apm,xgene-socpll-clock", xgene_socpllclk_init);
763 CLK_OF_DECLARE(xgene_pcppll_clock, "apm,xgene-pcppll-clock", xgene_pcppllclk_init);
764 CLK_OF_DECLARE(xgene_pmd_clock, "apm,xgene-pmd-clock", xgene_pmdclk_init);
765 CLK_OF_DECLARE(xgene_socpll_v2_clock, "apm,xgene-socpll-v2-clock",
766 xgene_socpllclk_init);
767 CLK_OF_DECLARE(xgene_pcppll_v2_clock, "apm,xgene-pcppll-v2-clock",
768 xgene_pcppllclk_init);
769 CLK_OF_DECLARE(xgene_dev_clock, "apm,xgene-device-clock", xgene_devclk_init);
Linux with added FPC-III support