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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/arm/mach-omap/clock.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/arm/mach-omap/clock.c')
-rw-r--r--arch/arm/mach-omap/clock.c1076
1 files changed, 1076 insertions, 0 deletions
diff --git a/arch/arm/mach-omap/clock.c b/arch/arm/mach-omap/clock.c
new file mode 100644
index 000000000000..e91186b5341a
--- /dev/null
+++ b/arch/arm/mach-omap/clock.c
@@ -0,0 +1,1076 @@
1/*
2 * linux/arch/arm/mach-omap/clock.c
3 *
4 * Copyright (C) 2004 Nokia corporation
5 * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 */
11#include <linux/module.h>
12#include <linux/kernel.h>
13#include <linux/list.h>
14#include <linux/errno.h>
15#include <linux/err.h>
16
17#include <asm/semaphore.h>
18#include <asm/hardware/clock.h>
19#include <asm/arch/board.h>
20#include <asm/arch/usb.h>
21
22#include "clock.h"
23
24static LIST_HEAD(clocks);
25static DECLARE_MUTEX(clocks_sem);
26static DEFINE_SPINLOCK(clockfw_lock);
27static void propagate_rate(struct clk * clk);
28/* External clock (MCLK & BCLK) functions */
29static int set_ext_clk_rate(struct clk * clk, unsigned long rate);
30static long round_ext_clk_rate(struct clk * clk, unsigned long rate);
31static void init_ext_clk(struct clk * clk);
32/* MPU virtual clock functions */
33static int select_table_rate(struct clk * clk, unsigned long rate);
34static long round_to_table_rate(struct clk * clk, unsigned long rate);
35void clk_setdpll(__u16, __u16);
36
37struct mpu_rate rate_table[] = {
38 /* MPU MHz, xtal MHz, dpll1 MHz, CKCTL, DPLL_CTL
39 * armdiv, dspdiv, dspmmu, tcdiv, perdiv, lcddiv
40 */
41#if defined(CONFIG_OMAP_ARM_216MHZ)
42 { 216000000, 12000000, 216000000, 0x050d, 0x2910 }, /* 1/1/2/2/2/8 */
43#endif
44#if defined(CONFIG_OMAP_ARM_195MHZ)
45 { 195000000, 13000000, 195000000, 0x050e, 0x2790 }, /* 1/1/2/2/4/8 */
46#endif
47#if defined(CONFIG_OMAP_ARM_192MHZ)
48 { 192000000, 19200000, 192000000, 0x050f, 0x2510 }, /* 1/1/2/2/8/8 */
49 { 192000000, 12000000, 192000000, 0x050f, 0x2810 }, /* 1/1/2/2/8/8 */
50 { 96000000, 12000000, 192000000, 0x055f, 0x2810 }, /* 2/2/2/2/8/8 */
51 { 48000000, 12000000, 192000000, 0x0ccf, 0x2810 }, /* 4/4/4/4/8/8 */
52 { 24000000, 12000000, 192000000, 0x0fff, 0x2810 }, /* 8/8/8/8/8/8 */
53#endif
54#if defined(CONFIG_OMAP_ARM_182MHZ)
55 { 182000000, 13000000, 182000000, 0x050e, 0x2710 }, /* 1/1/2/2/4/8 */
56#endif
57#if defined(CONFIG_OMAP_ARM_168MHZ)
58 { 168000000, 12000000, 168000000, 0x010f, 0x2710 }, /* 1/1/1/2/8/8 */
59#endif
60#if defined(CONFIG_OMAP_ARM_150MHZ)
61 { 150000000, 12000000, 150000000, 0x150a, 0x2cb0 }, /* 0/0/1/1/2/2 */
62#endif
63#if defined(CONFIG_OMAP_ARM_120MHZ)
64 { 120000000, 12000000, 120000000, 0x010a, 0x2510 }, /* 1/1/1/2/4/4 */
65#endif
66#if defined(CONFIG_OMAP_ARM_96MHZ)
67 { 96000000, 12000000, 96000000, 0x0005, 0x2410 }, /* 1/1/1/1/2/2 */
68#endif
69#if defined(CONFIG_OMAP_ARM_60MHZ)
70 { 60000000, 12000000, 60000000, 0x0005, 0x2290 }, /* 1/1/1/1/2/2 */
71#endif
72#if defined(CONFIG_OMAP_ARM_30MHZ)
73 { 30000000, 12000000, 60000000, 0x0555, 0x2290 }, /* 2/2/2/2/2/2 */
74#endif
75 { 0, 0, 0, 0, 0 },
76};
77
78
79static void ckctl_recalc(struct clk * clk)
80{
81 int dsor;
82
83 /* Calculate divisor encoded as 2-bit exponent */
84 dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
85 if (unlikely(clk->rate == clk->parent->rate / dsor))
86 return; /* No change, quick exit */
87 clk->rate = clk->parent->rate / dsor;
88
89 if (unlikely(clk->flags & RATE_PROPAGATES))
90 propagate_rate(clk);
91}
92
93
94static void followparent_recalc(struct clk * clk)
95{
96 clk->rate = clk->parent->rate;
97}
98
99
100static void watchdog_recalc(struct clk * clk)
101{
102 clk->rate = clk->parent->rate / 14;
103}
104
105
106static struct clk ck_ref = {
107 .name = "ck_ref",
108 .rate = 12000000,
109 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
110 ALWAYS_ENABLED,
111};
112
113static struct clk ck_dpll1 = {
114 .name = "ck_dpll1",
115 .parent = &ck_ref,
116 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
117 RATE_PROPAGATES | ALWAYS_ENABLED,
118};
119
120static struct clk ck_dpll1out = {
121 .name = "ck_dpll1out",
122 .parent = &ck_dpll1,
123 .flags = CLOCK_IN_OMAP16XX,
124 .enable_reg = ARM_IDLECT2,
125 .enable_bit = EN_CKOUT_ARM,
126 .recalc = &followparent_recalc,
127};
128
129static struct clk arm_ck = {
130 .name = "arm_ck",
131 .parent = &ck_dpll1,
132 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
133 RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
134 .rate_offset = CKCTL_ARMDIV_OFFSET,
135 .recalc = &ckctl_recalc,
136};
137
138static struct clk armper_ck = {
139 .name = "armper_ck",
140 .parent = &ck_dpll1,
141 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
142 RATE_CKCTL,
143 .enable_reg = ARM_IDLECT2,
144 .enable_bit = EN_PERCK,
145 .rate_offset = CKCTL_PERDIV_OFFSET,
146 .recalc = &ckctl_recalc,
147};
148
149static struct clk arm_gpio_ck = {
150 .name = "arm_gpio_ck",
151 .parent = &ck_dpll1,
152 .flags = CLOCK_IN_OMAP1510,
153 .enable_reg = ARM_IDLECT2,
154 .enable_bit = EN_GPIOCK,
155 .recalc = &followparent_recalc,
156};
157
158static struct clk armxor_ck = {
159 .name = "armxor_ck",
160 .parent = &ck_ref,
161 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
162 .enable_reg = ARM_IDLECT2,
163 .enable_bit = EN_XORPCK,
164 .recalc = &followparent_recalc,
165};
166
167static struct clk armtim_ck = {
168 .name = "armtim_ck",
169 .parent = &ck_ref,
170 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
171 .enable_reg = ARM_IDLECT2,
172 .enable_bit = EN_TIMCK,
173 .recalc = &followparent_recalc,
174};
175
176static struct clk armwdt_ck = {
177 .name = "armwdt_ck",
178 .parent = &ck_ref,
179 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
180 .enable_reg = ARM_IDLECT2,
181 .enable_bit = EN_WDTCK,
182 .recalc = &watchdog_recalc,
183};
184
185static struct clk arminth_ck16xx = {
186 .name = "arminth_ck",
187 .parent = &arm_ck,
188 .flags = CLOCK_IN_OMAP16XX,
189 .recalc = &followparent_recalc,
190 /* Note: On 16xx the frequency can be divided by 2 by programming
191 * ARM_CKCTL:ARM_INTHCK_SEL(14) to 1
192 *
193 * 1510 version is in TC clocks.
194 */
195};
196
197static struct clk dsp_ck = {
198 .name = "dsp_ck",
199 .parent = &ck_dpll1,
200 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
201 RATE_CKCTL,
202 .enable_reg = ARM_CKCTL,
203 .enable_bit = EN_DSPCK,
204 .rate_offset = CKCTL_DSPDIV_OFFSET,
205 .recalc = &ckctl_recalc,
206};
207
208static struct clk dspmmu_ck = {
209 .name = "dspmmu_ck",
210 .parent = &ck_dpll1,
211 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
212 RATE_CKCTL | ALWAYS_ENABLED,
213 .rate_offset = CKCTL_DSPMMUDIV_OFFSET,
214 .recalc = &ckctl_recalc,
215};
216
217static struct clk tc_ck = {
218 .name = "tc_ck",
219 .parent = &ck_dpll1,
220 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
221 RATE_CKCTL | RATE_PROPAGATES | ALWAYS_ENABLED,
222 .rate_offset = CKCTL_TCDIV_OFFSET,
223 .recalc = &ckctl_recalc,
224};
225
226static struct clk arminth_ck1510 = {
227 .name = "arminth_ck",
228 .parent = &tc_ck,
229 .flags = CLOCK_IN_OMAP1510,
230 .recalc = &followparent_recalc,
231 /* Note: On 1510 the frequency follows TC_CK
232 *
233 * 16xx version is in MPU clocks.
234 */
235};
236
237static struct clk tipb_ck = {
238 .name = "tibp_ck",
239 .parent = &tc_ck,
240 .flags = CLOCK_IN_OMAP1510,
241 .recalc = &followparent_recalc,
242};
243
244static struct clk l3_ocpi_ck = {
245 .name = "l3_ocpi_ck",
246 .parent = &tc_ck,
247 .flags = CLOCK_IN_OMAP16XX,
248 .enable_reg = ARM_IDLECT3,
249 .enable_bit = EN_OCPI_CK,
250 .recalc = &followparent_recalc,
251};
252
253static struct clk tc1_ck = {
254 .name = "tc1_ck",
255 .parent = &tc_ck,
256 .flags = CLOCK_IN_OMAP16XX,
257 .enable_reg = ARM_IDLECT3,
258 .enable_bit = EN_TC1_CK,
259 .recalc = &followparent_recalc,
260};
261
262static struct clk tc2_ck = {
263 .name = "tc2_ck",
264 .parent = &tc_ck,
265 .flags = CLOCK_IN_OMAP16XX,
266 .enable_reg = ARM_IDLECT3,
267 .enable_bit = EN_TC2_CK,
268 .recalc = &followparent_recalc,
269};
270
271static struct clk dma_ck = {
272 .name = "dma_ck",
273 .parent = &tc_ck,
274 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
275 .recalc = &followparent_recalc,
276};
277
278static struct clk dma_lcdfree_ck = {
279 .name = "dma_lcdfree_ck",
280 .parent = &tc_ck,
281 .flags = CLOCK_IN_OMAP16XX,
282 .recalc = &followparent_recalc,
283};
284
285static struct clk api_ck = {
286 .name = "api_ck",
287 .parent = &tc_ck,
288 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX,
289 .enable_reg = ARM_IDLECT2,
290 .enable_bit = EN_APICK,
291 .recalc = &followparent_recalc,
292};
293
294static struct clk lb_ck = {
295 .name = "lb_ck",
296 .parent = &tc_ck,
297 .flags = CLOCK_IN_OMAP1510,
298 .enable_reg = ARM_IDLECT2,
299 .enable_bit = EN_LBCK,
300 .recalc = &followparent_recalc,
301};
302
303static struct clk rhea1_ck = {
304 .name = "rhea1_ck",
305 .parent = &tc_ck,
306 .flags = CLOCK_IN_OMAP16XX,
307 .recalc = &followparent_recalc,
308};
309
310static struct clk rhea2_ck = {
311 .name = "rhea2_ck",
312 .parent = &tc_ck,
313 .flags = CLOCK_IN_OMAP16XX,
314 .recalc = &followparent_recalc,
315};
316
317static struct clk lcd_ck = {
318 .name = "lcd_ck",
319 .parent = &ck_dpll1,
320 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX | CLOCK_IN_OMAP730 |
321 RATE_CKCTL,
322 .enable_reg = ARM_IDLECT2,
323 .enable_bit = EN_LCDCK,
324 .rate_offset = CKCTL_LCDDIV_OFFSET,
325 .recalc = &ckctl_recalc,
326};
327
328static struct clk uart1_ck = {
329 .name = "uart1_ck",
330 /* Direct from ULPD, no parent */
331 .rate = 48000000,
332 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
333 RATE_FIXED | ENABLE_REG_32BIT,
334 .enable_reg = MOD_CONF_CTRL_0,
335 .enable_bit = 29,
336 /* (Only on 1510)
337 * The "enable bit" actually chooses between 48MHz and 12MHz.
338 */
339};
340
341static struct clk uart2_ck = {
342 .name = "uart2_ck",
343 /* Direct from ULPD, no parent */
344 .rate = 48000000,
345 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
346 RATE_FIXED | ENABLE_REG_32BIT,
347 .enable_reg = MOD_CONF_CTRL_0,
348 .enable_bit = 30,
349 /* (for both 1510 and 16xx)
350 * The "enable bit" actually chooses between 48MHz and 12MHz/32kHz.
351 */
352};
353
354static struct clk uart3_ck = {
355 .name = "uart3_ck",
356 /* Direct from ULPD, no parent */
357 .rate = 48000000,
358 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
359 RATE_FIXED | ENABLE_REG_32BIT,
360 .enable_reg = MOD_CONF_CTRL_0,
361 .enable_bit = 31,
362 /* (Only on 1510)
363 * The "enable bit" actually chooses between 48MHz and 12MHz.
364 */
365};
366
367static struct clk usb_clko = { /* 6 MHz output on W4_USB_CLKO */
368 .name = "usb_clko",
369 /* Direct from ULPD, no parent */
370 .rate = 6000000,
371 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
372 RATE_FIXED | ENABLE_REG_32BIT,
373 .enable_reg = ULPD_CLOCK_CTRL,
374 .enable_bit = USB_MCLK_EN_BIT,
375};
376
377static struct clk usb_hhc_ck1510 = {
378 .name = "usb_hhc_ck",
379 /* Direct from ULPD, no parent */
380 .rate = 48000000, /* Actually 2 clocks, 12MHz and 48MHz */
381 .flags = CLOCK_IN_OMAP1510 |
382 RATE_FIXED | ENABLE_REG_32BIT,
383 .enable_reg = MOD_CONF_CTRL_0,
384 .enable_bit = USB_HOST_HHC_UHOST_EN,
385};
386
387static struct clk usb_hhc_ck16xx = {
388 .name = "usb_hhc_ck",
389 /* Direct from ULPD, no parent */
390 .rate = 48000000,
391 /* OTG_SYSCON_2.OTG_PADEN == 0 (not 1510-compatible) */
392 .flags = CLOCK_IN_OMAP16XX |
393 RATE_FIXED | ENABLE_REG_32BIT,
394 .enable_reg = OTG_BASE + 0x08 /* OTG_SYSCON_2 */,
395 .enable_bit = 8 /* UHOST_EN */,
396};
397
398static struct clk mclk_1510 = {
399 .name = "mclk",
400 /* Direct from ULPD, no parent. May be enabled by ext hardware. */
401 .rate = 12000000,
402 .flags = CLOCK_IN_OMAP1510 | RATE_FIXED,
403};
404
405static struct clk mclk_16xx = {
406 .name = "mclk",
407 /* Direct from ULPD, no parent. May be enabled by ext hardware. */
408 .flags = CLOCK_IN_OMAP16XX,
409 .enable_reg = COM_CLK_DIV_CTRL_SEL,
410 .enable_bit = COM_ULPD_PLL_CLK_REQ,
411 .set_rate = &set_ext_clk_rate,
412 .round_rate = &round_ext_clk_rate,
413 .init = &init_ext_clk,
414};
415
416static struct clk bclk_1510 = {
417 .name = "bclk",
418 /* Direct from ULPD, no parent. May be enabled by ext hardware. */
419 .rate = 12000000,
420 .flags = CLOCK_IN_OMAP1510 | RATE_FIXED,
421};
422
423static struct clk bclk_16xx = {
424 .name = "bclk",
425 /* Direct from ULPD, no parent. May be enabled by ext hardware. */
426 .flags = CLOCK_IN_OMAP16XX,
427 .enable_reg = SWD_CLK_DIV_CTRL_SEL,
428 .enable_bit = SWD_ULPD_PLL_CLK_REQ,
429 .set_rate = &set_ext_clk_rate,
430 .round_rate = &round_ext_clk_rate,
431 .init = &init_ext_clk,
432};
433
434static struct clk mmc1_ck = {
435 .name = "mmc1_ck",
436 /* Functional clock is direct from ULPD, interface clock is ARMPER */
437 .parent = &armper_ck,
438 .rate = 48000000,
439 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
440 RATE_FIXED | ENABLE_REG_32BIT,
441 .enable_reg = MOD_CONF_CTRL_0,
442 .enable_bit = 23,
443};
444
445static struct clk mmc2_ck = {
446 .name = "mmc2_ck",
447 /* Functional clock is direct from ULPD, interface clock is ARMPER */
448 .parent = &armper_ck,
449 .rate = 48000000,
450 .flags = CLOCK_IN_OMAP16XX |
451 RATE_FIXED | ENABLE_REG_32BIT,
452 .enable_reg = MOD_CONF_CTRL_0,
453 .enable_bit = 20,
454};
455
456static struct clk virtual_ck_mpu = {
457 .name = "mpu",
458 .flags = CLOCK_IN_OMAP1510 | CLOCK_IN_OMAP16XX |
459 VIRTUAL_CLOCK | ALWAYS_ENABLED,
460 .parent = &arm_ck, /* Is smarter alias for */
461 .recalc = &followparent_recalc,
462 .set_rate = &select_table_rate,
463 .round_rate = &round_to_table_rate,
464};
465
466
467static struct clk * onchip_clks[] = {
468 /* non-ULPD clocks */
469 &ck_ref,
470 &ck_dpll1,
471 /* CK_GEN1 clocks */
472 &ck_dpll1out,
473 &arm_ck,
474 &armper_ck,
475 &arm_gpio_ck,
476 &armxor_ck,
477 &armtim_ck,
478 &armwdt_ck,
479 &arminth_ck1510, &arminth_ck16xx,
480 /* CK_GEN2 clocks */
481 &dsp_ck,
482 &dspmmu_ck,
483 /* CK_GEN3 clocks */
484 &tc_ck,
485 &tipb_ck,
486 &l3_ocpi_ck,
487 &tc1_ck,
488 &tc2_ck,
489 &dma_ck,
490 &dma_lcdfree_ck,
491 &api_ck,
492 &lb_ck,
493 &rhea1_ck,
494 &rhea2_ck,
495 &lcd_ck,
496 /* ULPD clocks */
497 &uart1_ck,
498 &uart2_ck,
499 &uart3_ck,
500 &usb_clko,
501 &usb_hhc_ck1510, &usb_hhc_ck16xx,
502 &mclk_1510, &mclk_16xx,
503 &bclk_1510, &bclk_16xx,
504 &mmc1_ck,
505 &mmc2_ck,
506 /* Virtual clocks */
507 &virtual_ck_mpu,
508};
509
510struct clk *clk_get(struct device *dev, const char *id)
511{
512 struct clk *p, *clk = ERR_PTR(-ENOENT);
513
514 down(&clocks_sem);
515 list_for_each_entry(p, &clocks, node) {
516 if (strcmp(id, p->name) == 0 && try_module_get(p->owner)) {
517 clk = p;
518 break;
519 }
520 }
521 up(&clocks_sem);
522
523 return clk;
524}
525EXPORT_SYMBOL(clk_get);
526
527
528void clk_put(struct clk *clk)
529{
530 if (clk && !IS_ERR(clk))
531 module_put(clk->owner);
532}
533EXPORT_SYMBOL(clk_put);
534
535
536int __clk_enable(struct clk *clk)
537{
538 __u16 regval16;
539 __u32 regval32;
540
541 if (clk->flags & ALWAYS_ENABLED)
542 return 0;
543
544 if (unlikely(clk->enable_reg == 0)) {
545 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
546 clk->name);
547 return 0;
548 }
549
550 if (clk->flags & ENABLE_REG_32BIT) {
551 regval32 = omap_readl(clk->enable_reg);
552 regval32 |= (1 << clk->enable_bit);
553 omap_writel(regval32, clk->enable_reg);
554 } else {
555 regval16 = omap_readw(clk->enable_reg);
556 regval16 |= (1 << clk->enable_bit);
557 omap_writew(regval16, clk->enable_reg);
558 }
559
560 return 0;
561}
562
563
564void __clk_disable(struct clk *clk)
565{
566 __u16 regval16;
567 __u32 regval32;
568
569 if (clk->enable_reg == 0)
570 return;
571
572 if (clk->flags & ENABLE_REG_32BIT) {
573 regval32 = omap_readl(clk->enable_reg);
574 regval32 &= ~(1 << clk->enable_bit);
575 omap_writel(regval32, clk->enable_reg);
576 } else {
577 regval16 = omap_readw(clk->enable_reg);
578 regval16 &= ~(1 << clk->enable_bit);
579 omap_writew(regval16, clk->enable_reg);
580 }
581}
582
583
584void __clk_unuse(struct clk *clk)
585{
586 if (clk->usecount > 0 && !(--clk->usecount)) {
587 __clk_disable(clk);
588 if (likely(clk->parent))
589 __clk_unuse(clk->parent);
590 }
591}
592
593
594int __clk_use(struct clk *clk)
595{
596 int ret = 0;
597 if (clk->usecount++ == 0) {
598 if (likely(clk->parent))
599 ret = __clk_use(clk->parent);
600
601 if (unlikely(ret != 0)) {
602 clk->usecount--;
603 return ret;
604 }
605
606 ret = __clk_enable(clk);
607
608 if (unlikely(ret != 0) && clk->parent) {
609 __clk_unuse(clk->parent);
610 clk->usecount--;
611 }
612 }
613
614 return ret;
615}
616
617
618int clk_enable(struct clk *clk)
619{
620 unsigned long flags;
621 int ret;
622
623 spin_lock_irqsave(&clockfw_lock, flags);
624 ret = __clk_enable(clk);
625 spin_unlock_irqrestore(&clockfw_lock, flags);
626 return ret;
627}
628EXPORT_SYMBOL(clk_enable);
629
630
631void clk_disable(struct clk *clk)
632{
633 unsigned long flags;
634
635 spin_lock_irqsave(&clockfw_lock, flags);
636 __clk_disable(clk);
637 spin_unlock_irqrestore(&clockfw_lock, flags);
638}
639EXPORT_SYMBOL(clk_disable);
640
641
642int clk_use(struct clk *clk)
643{
644 unsigned long flags;
645 int ret = 0;
646
647 spin_lock_irqsave(&clockfw_lock, flags);
648 ret = __clk_use(clk);
649 spin_unlock_irqrestore(&clockfw_lock, flags);
650 return ret;
651}
652EXPORT_SYMBOL(clk_use);
653
654
655void clk_unuse(struct clk *clk)
656{
657 unsigned long flags;
658
659 spin_lock_irqsave(&clockfw_lock, flags);
660 __clk_unuse(clk);
661 spin_unlock_irqrestore(&clockfw_lock, flags);
662}
663EXPORT_SYMBOL(clk_unuse);
664
665
666int clk_get_usecount(struct clk *clk)
667{
668 return clk->usecount;
669}
670EXPORT_SYMBOL(clk_get_usecount);
671
672
673unsigned long clk_get_rate(struct clk *clk)
674{
675 return clk->rate;
676}
677EXPORT_SYMBOL(clk_get_rate);
678
679
680static __u16 verify_ckctl_value(__u16 newval)
681{
682 /* This function checks for following limitations set
683 * by the hardware (all conditions must be true):
684 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
685 * ARM_CK >= TC_CK
686 * DSP_CK >= TC_CK
687 * DSPMMU_CK >= TC_CK
688 *
689 * In addition following rules are enforced:
690 * LCD_CK <= TC_CK
691 * ARMPER_CK <= TC_CK
692 *
693 * However, maximum frequencies are not checked for!
694 */
695 __u8 per_exp;
696 __u8 lcd_exp;
697 __u8 arm_exp;
698 __u8 dsp_exp;
699 __u8 tc_exp;
700 __u8 dspmmu_exp;
701
702 per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
703 lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
704 arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
705 dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
706 tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
707 dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
708
709 if (dspmmu_exp < dsp_exp)
710 dspmmu_exp = dsp_exp;
711 if (dspmmu_exp > dsp_exp+1)
712 dspmmu_exp = dsp_exp+1;
713 if (tc_exp < arm_exp)
714 tc_exp = arm_exp;
715 if (tc_exp < dspmmu_exp)
716 tc_exp = dspmmu_exp;
717 if (tc_exp > lcd_exp)
718 lcd_exp = tc_exp;
719 if (tc_exp > per_exp)
720 per_exp = tc_exp;
721
722 newval &= 0xf000;
723 newval |= per_exp << CKCTL_PERDIV_OFFSET;
724 newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
725 newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
726 newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
727 newval |= tc_exp << CKCTL_TCDIV_OFFSET;
728 newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
729
730 return newval;
731}
732
733
734static int calc_dsor_exp(struct clk *clk, unsigned long rate)
735{
736 /* Note: If target frequency is too low, this function will return 4,
737 * which is invalid value. Caller must check for this value and act
738 * accordingly.
739 *
740 * Note: This function does not check for following limitations set
741 * by the hardware (all conditions must be true):
742 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
743 * ARM_CK >= TC_CK
744 * DSP_CK >= TC_CK
745 * DSPMMU_CK >= TC_CK
746 */
747 unsigned long realrate;
748 struct clk * parent;
749 unsigned dsor_exp;
750
751 if (unlikely(!(clk->flags & RATE_CKCTL)))
752 return -EINVAL;
753
754 parent = clk->parent;
755 if (unlikely(parent == 0))
756 return -EIO;
757
758 realrate = parent->rate;
759 for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
760 if (realrate <= rate)
761 break;
762
763 realrate /= 2;
764 }
765
766 return dsor_exp;
767}
768
769long clk_round_rate(struct clk *clk, unsigned long rate)
770{
771 int dsor_exp;
772
773 if (clk->flags & RATE_FIXED)
774 return clk->rate;
775
776 if (clk->flags & RATE_CKCTL) {
777 dsor_exp = calc_dsor_exp(clk, rate);
778 if (dsor_exp < 0)
779 return dsor_exp;
780 if (dsor_exp > 3)
781 dsor_exp = 3;
782 return clk->parent->rate / (1 << dsor_exp);
783 }
784
785 if(clk->round_rate != 0)
786 return clk->round_rate(clk, rate);
787
788 return clk->rate;
789}
790EXPORT_SYMBOL(clk_round_rate);
791
792
793static void propagate_rate(struct clk * clk)
794{
795 struct clk ** clkp;
796
797 for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
798 if (likely((*clkp)->parent != clk)) continue;
799 if (likely((*clkp)->recalc))
800 (*clkp)->recalc(*clkp);
801 }
802}
803
804
805static int select_table_rate(struct clk * clk, unsigned long rate)
806{
807 /* Find the highest supported frequency <= rate and switch to it */
808 struct mpu_rate * ptr;
809
810 if (clk != &virtual_ck_mpu)
811 return -EINVAL;
812
813 for (ptr = rate_table; ptr->rate; ptr++) {
814 if (ptr->xtal != ck_ref.rate)
815 continue;
816
817 /* DPLL1 cannot be reprogrammed without risking system crash */
818 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
819 continue;
820
821 /* Can check only after xtal frequency check */
822 if (ptr->rate <= rate)
823 break;
824 }
825
826 if (!ptr->rate)
827 return -EINVAL;
828
829 if (unlikely(ck_dpll1.rate == 0)) {
830 omap_writew(ptr->dpllctl_val, DPLL_CTL);
831 ck_dpll1.rate = ptr->pll_rate;
832 }
833 omap_writew(ptr->ckctl_val, ARM_CKCTL);
834 propagate_rate(&ck_dpll1);
835 return 0;
836}
837
838
839static long round_to_table_rate(struct clk * clk, unsigned long rate)
840{
841 /* Find the highest supported frequency <= rate */
842 struct mpu_rate * ptr;
843 long highest_rate;
844
845 if (clk != &virtual_ck_mpu)
846 return -EINVAL;
847
848 highest_rate = -EINVAL;
849
850 for (ptr = rate_table; ptr->rate; ptr++) {
851 if (ptr->xtal != ck_ref.rate)
852 continue;
853
854 highest_rate = ptr->rate;
855
856 /* Can check only after xtal frequency check */
857 if (ptr->rate <= rate)
858 break;
859 }
860
861 return highest_rate;
862}
863
864
865int clk_set_rate(struct clk *clk, unsigned long rate)
866{
867 int ret = -EINVAL;
868 int dsor_exp;
869 __u16 regval;
870 unsigned long flags;
871
872 if (clk->flags & RATE_CKCTL) {
873 dsor_exp = calc_dsor_exp(clk, rate);
874 if (dsor_exp > 3)
875 dsor_exp = -EINVAL;
876 if (dsor_exp < 0)
877 return dsor_exp;
878
879 spin_lock_irqsave(&clockfw_lock, flags);
880 regval = omap_readw(ARM_CKCTL);
881 regval &= ~(3 << clk->rate_offset);
882 regval |= dsor_exp << clk->rate_offset;
883 regval = verify_ckctl_value(regval);
884 omap_writew(regval, ARM_CKCTL);
885 clk->rate = clk->parent->rate / (1 << dsor_exp);
886 spin_unlock_irqrestore(&clockfw_lock, flags);
887 ret = 0;
888 } else if(clk->set_rate != 0) {
889 spin_lock_irqsave(&clockfw_lock, flags);
890 ret = clk->set_rate(clk, rate);
891 spin_unlock_irqrestore(&clockfw_lock, flags);
892 }
893
894 if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
895 propagate_rate(clk);
896
897 return ret;
898}
899EXPORT_SYMBOL(clk_set_rate);
900
901
902static unsigned calc_ext_dsor(unsigned long rate)
903{
904 unsigned dsor;
905
906 /* MCLK and BCLK divisor selection is not linear:
907 * freq = 96MHz / dsor
908 *
909 * RATIO_SEL range: dsor <-> RATIO_SEL
910 * 0..6: (RATIO_SEL+2) <-> (dsor-2)
911 * 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
912 * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
913 * can not be used.
914 */
915 for (dsor = 2; dsor < 96; ++dsor) {
916 if ((dsor & 1) && dsor > 8)
917 continue;
918 if (rate >= 96000000 / dsor)
919 break;
920 }
921 return dsor;
922}
923
924
925static int set_ext_clk_rate(struct clk * clk, unsigned long rate)
926{
927 unsigned dsor;
928 __u16 ratio_bits;
929
930 dsor = calc_ext_dsor(rate);
931 clk->rate = 96000000 / dsor;
932 if (dsor > 8)
933 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
934 else
935 ratio_bits = (dsor - 2) << 2;
936
937 ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
938 omap_writew(ratio_bits, clk->enable_reg);
939
940 return 0;
941}
942
943
944static long round_ext_clk_rate(struct clk * clk, unsigned long rate)
945{
946 return 96000000 / calc_ext_dsor(rate);
947}
948
949
950static void init_ext_clk(struct clk * clk)
951{
952 unsigned dsor;
953 __u16 ratio_bits;
954
955 /* Determine current rate and ensure clock is based on 96MHz APLL */
956 ratio_bits = omap_readw(clk->enable_reg) & ~1;
957 omap_writew(ratio_bits, clk->enable_reg);
958
959 ratio_bits = (ratio_bits & 0xfc) >> 2;
960 if (ratio_bits > 6)
961 dsor = (ratio_bits - 6) * 2 + 8;
962 else
963 dsor = ratio_bits + 2;
964
965 clk-> rate = 96000000 / dsor;
966}
967
968
969int clk_register(struct clk *clk)
970{
971 down(&clocks_sem);
972 list_add(&clk->node, &clocks);
973 if (clk->init)
974 clk->init(clk);
975 up(&clocks_sem);
976 return 0;
977}
978EXPORT_SYMBOL(clk_register);
979
980void clk_unregister(struct clk *clk)
981{
982 down(&clocks_sem);
983 list_del(&clk->node);
984 up(&clocks_sem);
985}
986EXPORT_SYMBOL(clk_unregister);
987
988
989
990int __init clk_init(void)
991{
992 struct clk ** clkp;
993 const struct omap_clock_config *info;
994 int crystal_type = 0; /* Default 12 MHz */
995
996 for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
997 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
998 clk_register(*clkp);
999 continue;
1000 }
1001
1002 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
1003 clk_register(*clkp);
1004 continue;
1005 }
1006
1007 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
1008 clk_register(*clkp);
1009 continue;
1010 }
1011 }
1012
1013 info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
1014 if (info != NULL) {
1015 if (!cpu_is_omap1510())
1016 crystal_type = info->system_clock_type;
1017 }
1018
1019#if defined(CONFIG_ARCH_OMAP730)
1020 ck_ref.rate = 13000000;
1021#elif defined(CONFIG_ARCH_OMAP16XX)
1022 if (crystal_type == 2)
1023 ck_ref.rate = 19200000;
1024#endif
1025
1026 /* We want to be in syncronous scalable mode */
1027 omap_writew(0x1000, ARM_SYSST);
1028
1029 /* Find the highest supported frequency and enable it */
1030 if (select_table_rate(&virtual_ck_mpu, ~0)) {
1031 printk(KERN_ERR "System frequencies not set. Check your config.\n");
1032 /* Guess sane values (60MHz) */
1033 omap_writew(0x2290, DPLL_CTL);
1034 omap_writew(0x1005, ARM_CKCTL);
1035 ck_dpll1.rate = 60000000;
1036 propagate_rate(&ck_dpll1);
1037 printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): %ld/%ld/%ld\n",
1038 ck_ref.rate, ck_dpll1.rate, arm_ck.rate);
1039 }
1040
1041 /* Cache rates for clocks connected to ck_ref (not dpll1) */
1042 propagate_rate(&ck_ref);
1043
1044#ifdef CONFIG_MACH_OMAP_PERSEUS2
1045 /* Select slicer output as OMAP input clock */
1046 omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
1047#endif
1048
1049 /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
1050 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
1051
1052 /* Put DSP/MPUI into reset until needed */
1053 omap_writew(0, ARM_RSTCT1);
1054 omap_writew(1, ARM_RSTCT2);
1055 omap_writew(0x400, ARM_IDLECT1);
1056
1057 /*
1058 * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
1059 * of the ARM_IDLECT2 register must be set to zero. The power-on
1060 * default value of this bit is one.
1061 */
1062 omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */
1063
1064 /*
1065 * Only enable those clocks we will need, let the drivers
1066 * enable other clocks as necessary
1067 */
1068 clk_use(&armper_ck);
1069 clk_use(&armxor_ck);
1070 clk_use(&armtim_ck);
1071
1072 if (cpu_is_omap1510())
1073 clk_enable(&arm_gpio_ck);
1074
1075 return 0;
1076}
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