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kbuild: implement several W= levels
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / arm / mach-tcc8k / clock.c
blobe7cdae5c77a4c9137050d5cfd8977c62c073de35
1 /*
2 * Lowlevel clock handling for Telechips TCC8xxx SoCs
3 *
4 * Copyright (C) 2010 by Hans J. Koch <hjk@linutronix.de>
5 *
6 * Licensed under the terms of the GPL v2
7 */
8
9 #include <linux/clk.h>
10 #include <linux/delay.h>
11 #include <linux/err.h>
12 #include <linux/io.h>
13 #include <linux/module.h>
14 #include <linux/spinlock.h>
15 #include <linux/clkdev.h>
16
17 #include <mach/clock.h>
18 #include <mach/irqs.h>
19 #include <mach/tcc8k-regs.h>
20
21 #include "common.h"
22
23 #define BCLKCTR0 (CKC_BASE + BCLKCTR0_OFFS)
24 #define BCLKCTR1 (CKC_BASE + BCLKCTR1_OFFS)
25
26 #define ACLKREF (CKC_BASE + ACLKREF_OFFS)
27 #define ACLKUART0 (CKC_BASE + ACLKUART0_OFFS)
28 #define ACLKUART1 (CKC_BASE + ACLKUART1_OFFS)
29 #define ACLKUART2 (CKC_BASE + ACLKUART2_OFFS)
30 #define ACLKUART3 (CKC_BASE + ACLKUART3_OFFS)
31 #define ACLKUART4 (CKC_BASE + ACLKUART4_OFFS)
32 #define ACLKI2C (CKC_BASE + ACLKI2C_OFFS)
33 #define ACLKADC (CKC_BASE + ACLKADC_OFFS)
34 #define ACLKUSBH (CKC_BASE + ACLKUSBH_OFFS)
35 #define ACLKLCD (CKC_BASE + ACLKLCD_OFFS)
36 #define ACLKSDH0 (CKC_BASE + ACLKSDH0_OFFS)
37 #define ACLKSDH1 (CKC_BASE + ACLKSDH1_OFFS)
38 #define ACLKSPI0 (CKC_BASE + ACLKSPI0_OFFS)
39 #define ACLKSPI1 (CKC_BASE + ACLKSPI1_OFFS)
40 #define ACLKSPDIF (CKC_BASE + ACLKSPDIF_OFFS)
41 #define ACLKC3DEC (CKC_BASE + ACLKC3DEC_OFFS)
42 #define ACLKCAN0 (CKC_BASE + ACLKCAN0_OFFS)
43 #define ACLKCAN1 (CKC_BASE + ACLKCAN1_OFFS)
44 #define ACLKGSB0 (CKC_BASE + ACLKGSB0_OFFS)
45 #define ACLKGSB1 (CKC_BASE + ACLKGSB1_OFFS)
46 #define ACLKGSB2 (CKC_BASE + ACLKGSB2_OFFS)
47 #define ACLKGSB3 (CKC_BASE + ACLKGSB3_OFFS)
48 #define ACLKTCT (CKC_BASE + ACLKTCT_OFFS)
49 #define ACLKTCX (CKC_BASE + ACLKTCX_OFFS)
50 #define ACLKTCZ (CKC_BASE + ACLKTCZ_OFFS)
51
52 #define ACLK_MAX_DIV (0xfff + 1)
53
54 /* Crystal frequencies */
55 static unsigned long xi_rate, xti_rate;
56
57 static void __iomem *pll_cfg_addr(int pll)
58 {
59 switch (pll) {
60 case 0: return (CKC_BASE + PLL0CFG_OFFS);
61 case 1: return (CKC_BASE + PLL1CFG_OFFS);
62 case 2: return (CKC_BASE + PLL2CFG_OFFS);
63 default:
64 BUG();
65 }
66 }
67
68 static int pll_enable(int pll, int enable)
69 {
70 u32 reg;
71 void __iomem *addr = pll_cfg_addr(pll);
72
73 reg = __raw_readl(addr);
74 if (enable)
75 reg &= ~PLLxCFG_PD;
76 else
77 reg |= PLLxCFG_PD;
78
79 __raw_writel(reg, addr);
80 return 0;
81 }
82
83 static int xi_enable(int enable)
84 {
85 u32 reg;
86
87 reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
88 if (enable)
89 reg |= CLKCTRL_XE;
90 else
91 reg &= ~CLKCTRL_XE;
92
93 __raw_writel(reg, CKC_BASE + CLKCTRL_OFFS);
94 return 0;
95 }
96
97 static int root_clk_enable(enum root_clks src)
98 {
99 switch (src) {
100 case CLK_SRC_PLL0: return pll_enable(0, 1);
101 case CLK_SRC_PLL1: return pll_enable(1, 1);
102 case CLK_SRC_PLL2: return pll_enable(2, 1);
103 case CLK_SRC_XI: return xi_enable(1);
104 default:
105 BUG();
106 }
107 return 0;
108 }
109
110 static int root_clk_disable(enum root_clks src)
111 {
112 switch (src) {
113 case CLK_SRC_PLL0: return pll_enable(0, 0);
114 case CLK_SRC_PLL1: return pll_enable(1, 0);
115 case CLK_SRC_PLL2: return pll_enable(2, 0);
116 case CLK_SRC_XI: return xi_enable(0);
117 default:
118 BUG();
119 }
120 return 0;
121 }
122
123 static int enable_clk(struct clk *clk)
124 {
125 u32 reg;
126
127 if (clk->root_id != CLK_SRC_NOROOT)
128 return root_clk_enable(clk->root_id);
129
130 if (clk->aclkreg) {
131 reg = __raw_readl(clk->aclkreg);
132 reg |= ACLK_EN;
133 __raw_writel(reg, clk->aclkreg);
134 }
135 if (clk->bclkctr) {
136 reg = __raw_readl(clk->bclkctr);
137 reg |= 1 << clk->bclk_shift;
138 __raw_writel(reg, clk->bclkctr);
139 }
140 return 0;
141 }
142
143 static void disable_clk(struct clk *clk)
144 {
145 u32 reg;
146
147 if (clk->root_id != CLK_SRC_NOROOT) {
148 root_clk_disable(clk->root_id);
149 return;
150 }
151
152 if (clk->bclkctr) {
153 reg = __raw_readl(clk->bclkctr);
154 reg &= ~(1 << clk->bclk_shift);
155 __raw_writel(reg, clk->bclkctr);
156 }
157 if (clk->aclkreg) {
158 reg = __raw_readl(clk->aclkreg);
159 reg &= ~ACLK_EN;
160 __raw_writel(reg, clk->aclkreg);
161 }
162 }
163
164 static unsigned long get_rate_pll(int pll)
165 {
166 u32 reg;
167 unsigned long s, m, p;
168 void __iomem *addr = pll_cfg_addr(pll);
169
170 reg = __raw_readl(addr);
171 s = (reg >> 16) & 0x07;
172 m = (reg >> 8) & 0xff;
173 p = reg & 0x3f;
174
175 return (m * xi_rate) / (p * (1 << s));
176 }
177
178 static unsigned long get_rate_pll_div(int pll)
179 {
180 u32 reg;
181 unsigned long div = 0;
182 void __iomem *addr;
183
184 switch (pll) {
185 case 0:
186 addr = CKC_BASE + CLKDIVC0_OFFS;
187 reg = __raw_readl(addr);
188 if (reg & CLKDIVC0_P0E)
189 div = (reg >> 24) & 0x3f;
190 break;
191 case 1:
192 addr = CKC_BASE + CLKDIVC0_OFFS;
193 reg = __raw_readl(addr);
194 if (reg & CLKDIVC0_P1E)
195 div = (reg >> 16) & 0x3f;
196 break;
197 case 2:
198 addr = CKC_BASE + CLKDIVC1_OFFS;
199 reg = __raw_readl(addr);
200 if (reg & CLKDIVC1_P2E)
201 div = reg & 0x3f;
202 break;
203 }
204 return get_rate_pll(pll) / (div + 1);
205 }
206
207 static unsigned long get_rate_xi_div(void)
208 {
209 unsigned long div = 0;
210 u32 reg = __raw_readl(CKC_BASE + CLKDIVC0_OFFS);
211
212 if (reg & CLKDIVC0_XE)
213 div = (reg >> 8) & 0x3f;
214
215 return xi_rate / (div + 1);
216 }
217
218 static unsigned long get_rate_xti_div(void)
219 {
220 unsigned long div = 0;
221 u32 reg = __raw_readl(CKC_BASE + CLKDIVC0_OFFS);
222
223 if (reg & CLKDIVC0_XTE)
224 div = reg & 0x3f;
225
226 return xti_rate / (div + 1);
227 }
228
229 static unsigned long root_clk_get_rate(enum root_clks src)
230 {
231 switch (src) {
232 case CLK_SRC_PLL0: return get_rate_pll(0);
233 case CLK_SRC_PLL1: return get_rate_pll(1);
234 case CLK_SRC_PLL2: return get_rate_pll(2);
235 case CLK_SRC_PLL0DIV: return get_rate_pll_div(0);
236 case CLK_SRC_PLL1DIV: return get_rate_pll_div(1);
237 case CLK_SRC_PLL2DIV: return get_rate_pll_div(2);
238 case CLK_SRC_XI: return xi_rate;
239 case CLK_SRC_XTI: return xti_rate;
240 case CLK_SRC_XIDIV: return get_rate_xi_div();
241 case CLK_SRC_XTIDIV: return get_rate_xti_div();
242 default: return 0;
243 }
244 }
245
246 static unsigned long aclk_get_rate(struct clk *clk)
247 {
248 u32 reg;
249 unsigned long div;
250 unsigned int src;
251
252 reg = __raw_readl(clk->aclkreg);
253 div = reg & 0x0fff;
254 src = (reg >> ACLK_SEL_SHIFT) & CLK_SRC_MASK;
255 return root_clk_get_rate(src) / (div + 1);
256 }
257
258 static unsigned long aclk_best_div(struct clk *clk, unsigned long rate)
259 {
260 unsigned long div, src, freq, r1, r2;
261
262 if (!rate)
263 return ACLK_MAX_DIV;
264
265 src = __raw_readl(clk->aclkreg) >> ACLK_SEL_SHIFT;
266 src &= CLK_SRC_MASK;
267 freq = root_clk_get_rate(src);
268 div = freq / rate;
269 if (!div)
270 return 1;
271 if (div >= ACLK_MAX_DIV)
272 return ACLK_MAX_DIV;
273 r1 = freq / div;
274 r2 = freq / (div + 1);
275 if ((rate - r2) < (r1 - rate))
276 return div + 1;
277
278 return div;
279 }
280
281 static unsigned long aclk_round_rate(struct clk *clk, unsigned long rate)
282 {
283 unsigned int src;
284
285 src = __raw_readl(clk->aclkreg) >> ACLK_SEL_SHIFT;
286 src &= CLK_SRC_MASK;
287
288 return root_clk_get_rate(src) / aclk_best_div(clk, rate);
289 }
290
291 static int aclk_set_rate(struct clk *clk, unsigned long rate)
292 {
293 u32 reg;
294
295 reg = __raw_readl(clk->aclkreg) & ~ACLK_DIV_MASK;
296 reg |= aclk_best_div(clk, rate) - 1;
297 __raw_writel(reg, clk->aclkreg);
298 return 0;
299 }
300
301 static unsigned long get_rate_sys(struct clk *clk)
302 {
303 unsigned int src;
304
305 src = __raw_readl(CKC_BASE + CLKCTRL_OFFS) & CLK_SRC_MASK;
306 return root_clk_get_rate(src);
307 }
308
309 static unsigned long get_rate_bus(struct clk *clk)
310 {
311 unsigned int reg, sdiv, bdiv, rate;
312
313 reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
314 rate = get_rate_sys(clk);
315 sdiv = (reg >> 20) & 3;
316 if (sdiv)
317 rate /= sdiv + 1;
318 bdiv = (reg >> 4) & 0xff;
319 if (bdiv)
320 rate /= bdiv + 1;
321 return rate;
322 }
323
324 static unsigned long get_rate_cpu(struct clk *clk)
325 {
326 unsigned int reg, div, fsys, fbus;
327
328 fbus = get_rate_bus(clk);
329 reg = __raw_readl(CKC_BASE + CLKCTRL_OFFS);
330 if (reg & (1 << 29))
331 return fbus;
332 fsys = get_rate_sys(clk);
333 div = (reg >> 16) & 0x0f;
334 return fbus + ((fsys - fbus) * (div + 1)) / 16;
335 }
336
337 static unsigned long get_rate_root(struct clk *clk)
338 {
339 return root_clk_get_rate(clk->root_id);
340 }
341
342 static int aclk_set_parent(struct clk *clock, struct clk *parent)
343 {
344 u32 reg;
345
346 if (clock->parent == parent)
347 return 0;
348
349 clock->parent = parent;
350
351 if (!parent)
352 return 0;
353
354 if (parent->root_id == CLK_SRC_NOROOT)
355 return 0;
356 reg = __raw_readl(clock->aclkreg);
357 reg &= ~ACLK_SEL_MASK;
358 reg |= (parent->root_id << ACLK_SEL_SHIFT) & ACLK_SEL_MASK;
359 __raw_writel(reg, clock->aclkreg);
360
361 return 0;
362 }
363
364 #define DEFINE_ROOT_CLOCK(name, ri, p) \
365 static struct clk name = { \
366 .root_id = ri, \
367 .get_rate = get_rate_root, \
368 .enable = enable_clk, \
369 .disable = disable_clk, \
370 .parent = p, \
371 };
372
373 #define DEFINE_SPECIAL_CLOCK(name, gr, p) \
374 static struct clk name = { \
375 .root_id = CLK_SRC_NOROOT, \
376 .get_rate = gr, \
377 .parent = p, \
378 };
379
380 #define DEFINE_ACLOCK(name, bc, bs, ar) \
381 static struct clk name = { \
382 .root_id = CLK_SRC_NOROOT, \
383 .bclkctr = bc, \
384 .bclk_shift = bs, \
385 .aclkreg = ar, \
386 .get_rate = aclk_get_rate, \
387 .set_rate = aclk_set_rate, \
388 .round_rate = aclk_round_rate, \
389 .enable = enable_clk, \
390 .disable = disable_clk, \
391 .set_parent = aclk_set_parent, \
392 };
393
394 #define DEFINE_BCLOCK(name, bc, bs, gr, p) \
395 static struct clk name = { \
396 .root_id = CLK_SRC_NOROOT, \
397 .bclkctr = bc, \
398 .bclk_shift = bs, \
399 .get_rate = gr, \
400 .enable = enable_clk, \
401 .disable = disable_clk, \
402 .parent = p, \
403 };
404
405 DEFINE_ROOT_CLOCK(xi, CLK_SRC_XI, NULL)
406 DEFINE_ROOT_CLOCK(xti, CLK_SRC_XTI, NULL)
407 DEFINE_ROOT_CLOCK(xidiv, CLK_SRC_XIDIV, &xi)
408 DEFINE_ROOT_CLOCK(xtidiv, CLK_SRC_XTIDIV, &xti)
409 DEFINE_ROOT_CLOCK(pll0, CLK_SRC_PLL0, &xi)
410 DEFINE_ROOT_CLOCK(pll1, CLK_SRC_PLL1, &xi)
411 DEFINE_ROOT_CLOCK(pll2, CLK_SRC_PLL2, &xi)
412 DEFINE_ROOT_CLOCK(pll0div, CLK_SRC_PLL0DIV, &pll0)
413 DEFINE_ROOT_CLOCK(pll1div, CLK_SRC_PLL1DIV, &pll1)
414 DEFINE_ROOT_CLOCK(pll2div, CLK_SRC_PLL2DIV, &pll2)
415
416 /* The following 3 clocks are special and are initialized explicitly later */
417 DEFINE_SPECIAL_CLOCK(sys, get_rate_sys, NULL)
418 DEFINE_SPECIAL_CLOCK(bus, get_rate_bus, &sys)
419 DEFINE_SPECIAL_CLOCK(cpu, get_rate_cpu, &sys)
420
421 DEFINE_ACLOCK(tct, NULL, 0, ACLKTCT)
422 DEFINE_ACLOCK(tcx, NULL, 0, ACLKTCX)
423 DEFINE_ACLOCK(tcz, NULL, 0, ACLKTCZ)
424 DEFINE_ACLOCK(ref, NULL, 0, ACLKREF)
425 DEFINE_ACLOCK(uart0, BCLKCTR0, 5, ACLKUART0)
426 DEFINE_ACLOCK(uart1, BCLKCTR0, 23, ACLKUART1)
427 DEFINE_ACLOCK(uart2, BCLKCTR0, 6, ACLKUART2)
428 DEFINE_ACLOCK(uart3, BCLKCTR0, 8, ACLKUART3)
429 DEFINE_ACLOCK(uart4, BCLKCTR1, 6, ACLKUART4)
430 DEFINE_ACLOCK(i2c, BCLKCTR0, 7, ACLKI2C)
431 DEFINE_ACLOCK(adc, BCLKCTR0, 10, ACLKADC)
432 DEFINE_ACLOCK(usbh0, BCLKCTR0, 11, ACLKUSBH)
433 DEFINE_ACLOCK(lcd, BCLKCTR0, 13, ACLKLCD)
434 DEFINE_ACLOCK(sd0, BCLKCTR0, 17, ACLKSDH0)
435 DEFINE_ACLOCK(sd1, BCLKCTR1, 5, ACLKSDH1)
436 DEFINE_ACLOCK(spi0, BCLKCTR0, 24, ACLKSPI0)
437 DEFINE_ACLOCK(spi1, BCLKCTR0, 30, ACLKSPI1)
438 DEFINE_ACLOCK(spdif, BCLKCTR1, 2, ACLKSPDIF)
439 DEFINE_ACLOCK(c3dec, BCLKCTR1, 9, ACLKC3DEC)
440 DEFINE_ACLOCK(can0, BCLKCTR1, 10, ACLKCAN0)
441 DEFINE_ACLOCK(can1, BCLKCTR1, 11, ACLKCAN1)
442 DEFINE_ACLOCK(gsb0, BCLKCTR1, 13, ACLKGSB0)
443 DEFINE_ACLOCK(gsb1, BCLKCTR1, 14, ACLKGSB1)
444 DEFINE_ACLOCK(gsb2, BCLKCTR1, 15, ACLKGSB2)
445 DEFINE_ACLOCK(gsb3, BCLKCTR1, 16, ACLKGSB3)
446 DEFINE_ACLOCK(usbh1, BCLKCTR1, 20, ACLKUSBH)
447
448 DEFINE_BCLOCK(dai0, BCLKCTR0, 0, NULL, NULL)
449 DEFINE_BCLOCK(pic, BCLKCTR0, 1, NULL, NULL)
450 DEFINE_BCLOCK(tc, BCLKCTR0, 2, NULL, NULL)
451 DEFINE_BCLOCK(gpio, BCLKCTR0, 3, NULL, NULL)
452 DEFINE_BCLOCK(usbd, BCLKCTR0, 4, NULL, NULL)
453 DEFINE_BCLOCK(ecc, BCLKCTR0, 9, NULL, NULL)
454 DEFINE_BCLOCK(gdma0, BCLKCTR0, 12, NULL, NULL)
455 DEFINE_BCLOCK(rtc, BCLKCTR0, 15, NULL, NULL)
456 DEFINE_BCLOCK(nfc, BCLKCTR0, 16, NULL, NULL)
457 DEFINE_BCLOCK(g2d, BCLKCTR0, 18, NULL, NULL)
458 DEFINE_BCLOCK(gdma1, BCLKCTR0, 22, NULL, NULL)
459 DEFINE_BCLOCK(mscl, BCLKCTR0, 25, NULL, NULL)
460 DEFINE_BCLOCK(bdma, BCLKCTR1, 0, NULL, NULL)
461 DEFINE_BCLOCK(adma0, BCLKCTR1, 1, NULL, NULL)
462 DEFINE_BCLOCK(scfg, BCLKCTR1, 3, NULL, NULL)
463 DEFINE_BCLOCK(cid, BCLKCTR1, 4, NULL, NULL)
464 DEFINE_BCLOCK(dai1, BCLKCTR1, 7, NULL, NULL)
465 DEFINE_BCLOCK(adma1, BCLKCTR1, 8, NULL, NULL)
466 DEFINE_BCLOCK(gps, BCLKCTR1, 12, NULL, NULL)
467 DEFINE_BCLOCK(gdma2, BCLKCTR1, 17, NULL, NULL)
468 DEFINE_BCLOCK(gdma3, BCLKCTR1, 18, NULL, NULL)
469 DEFINE_BCLOCK(ddrc, BCLKCTR1, 19, NULL, NULL)
470
471 #define _REGISTER_CLOCK(d, n, c) \
472 { \
473 .dev_id = d, \
474 .con_id = n, \
475 .clk = &c, \
476 },
477
478 static struct clk_lookup lookups[] = {
479 _REGISTER_CLOCK(NULL, "bus", bus)
480 _REGISTER_CLOCK(NULL, "cpu", cpu)
481 _REGISTER_CLOCK(NULL, "tct", tct)
482 _REGISTER_CLOCK(NULL, "tcx", tcx)
483 _REGISTER_CLOCK(NULL, "tcz", tcz)
484 _REGISTER_CLOCK(NULL, "ref", ref)
485 _REGISTER_CLOCK(NULL, "dai0", dai0)
486 _REGISTER_CLOCK(NULL, "pic", pic)
487 _REGISTER_CLOCK(NULL, "tc", tc)
488 _REGISTER_CLOCK(NULL, "gpio", gpio)
489 _REGISTER_CLOCK(NULL, "usbd", usbd)
490 _REGISTER_CLOCK("tcc-uart.0", NULL, uart0)
491 _REGISTER_CLOCK("tcc-uart.2", NULL, uart2)
492 _REGISTER_CLOCK("tcc-i2c", NULL, i2c)
493 _REGISTER_CLOCK("tcc-uart.3", NULL, uart3)
494 _REGISTER_CLOCK(NULL, "ecc", ecc)
495 _REGISTER_CLOCK(NULL, "adc", adc)
496 _REGISTER_CLOCK("tcc-usbh.0", "usb", usbh0)
497 _REGISTER_CLOCK(NULL, "gdma0", gdma0)
498 _REGISTER_CLOCK(NULL, "lcd", lcd)
499 _REGISTER_CLOCK(NULL, "rtc", rtc)
500 _REGISTER_CLOCK(NULL, "nfc", nfc)
501 _REGISTER_CLOCK("tcc-mmc.0", NULL, sd0)
502 _REGISTER_CLOCK(NULL, "g2d", g2d)
503 _REGISTER_CLOCK(NULL, "gdma1", gdma1)
504 _REGISTER_CLOCK("tcc-uart.1", NULL, uart1)
505 _REGISTER_CLOCK("tcc-spi.0", NULL, spi0)
506 _REGISTER_CLOCK(NULL, "mscl", mscl)
507 _REGISTER_CLOCK("tcc-spi.1", NULL, spi1)
508 _REGISTER_CLOCK(NULL, "bdma", bdma)
509 _REGISTER_CLOCK(NULL, "adma0", adma0)
510 _REGISTER_CLOCK(NULL, "spdif", spdif)
511 _REGISTER_CLOCK(NULL, "scfg", scfg)
512 _REGISTER_CLOCK(NULL, "cid", cid)
513 _REGISTER_CLOCK("tcc-mmc.1", NULL, sd1)
514 _REGISTER_CLOCK("tcc-uart.4", NULL, uart4)
515 _REGISTER_CLOCK(NULL, "dai1", dai1)
516 _REGISTER_CLOCK(NULL, "adma1", adma1)
517 _REGISTER_CLOCK(NULL, "c3dec", c3dec)
518 _REGISTER_CLOCK("tcc-can.0", NULL, can0)
519 _REGISTER_CLOCK("tcc-can.1", NULL, can1)
520 _REGISTER_CLOCK(NULL, "gps", gps)
521 _REGISTER_CLOCK("tcc-gsb.0", NULL, gsb0)
522 _REGISTER_CLOCK("tcc-gsb.1", NULL, gsb1)
523 _REGISTER_CLOCK("tcc-gsb.2", NULL, gsb2)
524 _REGISTER_CLOCK("tcc-gsb.3", NULL, gsb3)
525 _REGISTER_CLOCK(NULL, "gdma2", gdma2)
526 _REGISTER_CLOCK(NULL, "gdma3", gdma3)
527 _REGISTER_CLOCK(NULL, "ddrc", ddrc)
528 _REGISTER_CLOCK("tcc-usbh.1", "usb", usbh1)
529 };
530
531 static struct clk *root_clk_by_index(enum root_clks src)
532 {
533 switch (src) {
534 case CLK_SRC_PLL0: return &pll0;
535 case CLK_SRC_PLL1: return &pll1;
536 case CLK_SRC_PLL2: return &pll2;
537 case CLK_SRC_PLL0DIV: return &pll0div;
538 case CLK_SRC_PLL1DIV: return &pll1div;
539 case CLK_SRC_PLL2DIV: return &pll2div;
540 case CLK_SRC_XI: return &xi;
541 case CLK_SRC_XTI: return &xti;
542 case CLK_SRC_XIDIV: return &xidiv;
543 case CLK_SRC_XTIDIV: return &xtidiv;
544 default: return NULL;
545 }
546 }
547
548 static void find_aclk_parent(struct clk *clk)
549 {
550 unsigned int src;
551 struct clk *clock;
552
553 if (!clk->aclkreg)
554 return;
555
556 src = __raw_readl(clk->aclkreg) >> ACLK_SEL_SHIFT;
557 src &= CLK_SRC_MASK;
558
559 clock = root_clk_by_index(src);
560 if (!clock)
561 return;
562
563 clk->parent = clock;
564 clk->set_parent = aclk_set_parent;
565 }
566
567 void __init tcc_clocks_init(unsigned long xi_freq, unsigned long xti_freq)
568 {
569 int i;
570
571 xi_rate = xi_freq;
572 xti_rate = xti_freq;
573
574 /* fixup parents and add the clock */
575 for (i = 0; i < ARRAY_SIZE(lookups); i++) {
576 find_aclk_parent(lookups[i].clk);
577 clkdev_add(&lookups[i]);
578 }
579 tcc8k_timer_init(&tcz, (void __iomem *)TIMER_BASE, INT_TC32);
580 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree