2 * linux/arch/arm/mach-omap2/clock.c
4 * Copyright (C) 2005 Texas Instruments Inc.
5 * Richard Woodruff <r-woodruff2@ti.com>
8 * Cleaned up and modified to use omap shared clock framework by
9 * Tony Lindgren <tony@atomide.com>
11 * Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
12 * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
18 #include <linux/module.h>
19 #include <linux/kernel.h>
20 #include <linux/device.h>
21 #include <linux/list.h>
22 #include <linux/errno.h>
23 #include <linux/delay.h>
24 #include <linux/clk.h>
28 #include <asm/arch/clock.h>
29 #include <asm/arch/sram.h>
30 #include <asm/div64.h>
35 #include "prm_regbits_24xx.h"
37 #include "cm_regbits_24xx.h"
41 /* CM_CLKSEL1_CORE.CLKSEL_VLYNQ options (2420) */
42 #define CLKSEL_VLYNQ_96MHZ 0
43 #define CLKSEL_VLYNQ_CORECLK_16 0x10
45 /* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */
46 #define EN_APLL_STOPPED 0
47 #define EN_APLL_LOCKED 3
49 /* CM_{CLKSEL2_CORE,CLKSEL_WKUP}.CLKSEL_GPT* options (24XX) */
50 #define CLKSEL_GPT_32K 0
51 #define CLKSEL_GPT_SYSCLK 1
52 #define CLKSEL_GPT_EXTALTCLK 2
54 /* CM_CLKSEL1_CORE.CLKSEL_DSS1 options (24XX) */
55 #define CLKSEL_DSS1_SYSCLK 0
56 #define CLKSEL_DSS1_CORECLK_16 0x10
58 /* CM_CLKSEL1_CORE.CLKSEL_DSS2 options (24XX) */
59 #define CLKSEL_DSS2_SYSCLK 0
60 #define CLKSEL_DSS2_48MHZ 1
62 /* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
63 #define APLLS_CLKIN_19_2MHZ 0
64 #define APLLS_CLKIN_13MHZ 2
65 #define APLLS_CLKIN_12MHZ 3
67 /* CM_CLKSEL1_PLL.54M_SOURCE options (24XX) */
68 #define CLK_54M_SOURCE_APLL 0
69 #define CLK_54M_SOURCE_EXTALTCLK 1
71 /* CM_CLKSEL1_PLL.48M_SOURCE options (24XX) */
72 #define CLK_48M_SOURCE_APLL 0
73 #define CLK_48M_SOURCE_EXTALTCLK 1
75 /* PRCM_CLKOUT_CTRL.CLKOUT_SOURCE options (2420) */
76 #define CLKOUT_SOURCE_CORE_CLK 0
77 #define CLKOUT_SOURCE_SYS_CLK 1
78 #define CLKOUT_SOURCE_96M_CLK 2
79 #define CLKOUT_SOURCE_54M_CLK 3
81 #define MAX_PLL_LOCK_WAIT 100000
83 //#define DOWN_VARIABLE_DPLL 1 /* Experimental */
85 static struct prcm_config *curr_prcm_set;
86 static struct clk *vclk;
87 static struct clk *sclk;
90 /*-------------------------------------------------------------------------
91 * Omap2 specific clock functions
92 *-------------------------------------------------------------------------*/
94 static inline u8 mask_to_shift(u32 mask)
100 * omap2_init_clksel_parent - set a clksel clk's parent field from the hardware
101 * @clk: OMAP clock struct ptr to use
103 * Given a pointer to a source-selectable struct clk, read the hardware
104 * register and determine what its parent is currently set to. Update the
105 * clk->parent field with the appropriate clk ptr.
107 static void omap2_init_clksel_parent(struct clk *clk)
109 const struct clksel *clks;
110 const struct clksel_rate *clkr;
116 /* XXX Should be __raw_readl for non-CM 3430 clocks ? */
117 r = cm_read_reg(clk->clksel_reg) & clk->clksel_mask;
118 r >>= mask_to_shift(clk->clksel_mask);
120 for (clks = clk->clksel; clks->parent && !found; clks++) {
121 for (clkr = clks->rates; clkr->div && !found; clkr++) {
122 if ((clkr->flags & cpu_mask) && (clkr->val == r)) {
123 if (clk->parent != clks->parent) {
124 pr_debug("clock: inited %s parent "
126 clk->name, clks->parent->name,
127 ((clk->parent->name) ?
128 clk->parent->name : "NULL"));
129 clk->parent = clks->parent;
137 printk(KERN_ERR "clock: init parent: could not find "
138 "regval %0x for clock %s\n", r, clk->name);
143 /* Recalculate SYST_CLK */
144 static void omap2_sys_clk_recalc(struct clk * clk)
148 if (!cpu_is_omap34xx()) {
149 div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
150 /* Test if ext clk divided by 1 or 2 */
151 div &= OMAP_SYSCLKDIV_MASK;
152 div >>= clk->rate_offset;
153 clk->rate = (clk->parent->rate / div);
158 static u32 omap2_get_dpll_rate(struct clk * tclk)
161 int dpll_mult, dpll_div, amult;
164 dpll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
166 dpll_mult = dpll & OMAP24XX_DPLL_MULT_MASK;
167 dpll_mult >>= OMAP24XX_DPLL_MULT_SHIFT; /* 10 bits */
168 dpll_div = dpll & OMAP24XX_DPLL_DIV_MASK;
169 dpll_div >>= OMAP24XX_DPLL_DIV_SHIFT; /* 4 bits */
170 dpll_clk = (long long)tclk->parent->rate * dpll_mult;
171 do_div(dpll_clk, dpll_div + 1);
172 amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
173 amult &= OMAP24XX_CORE_CLK_SRC_MASK;
180 * Used for clocks that have the same value as the parent clock,
181 * divided by some factor
183 static void omap2_fixed_divisor_recalc(struct clk *clk)
185 WARN_ON(!clk->fixed_div);
187 clk->rate = clk->parent->rate / clk->fixed_div;
189 if (clk->flags & RATE_PROPAGATES)
193 static void omap2_set_osc_ck(int enable)
197 pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
200 prm_write_reg(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
201 OMAP24XX_PRCM_CLKSRC_CTRL);
203 prm_write_reg(pcc | OMAP_AUTOEXTCLKMODE_MASK,
204 OMAP24XX_PRCM_CLKSRC_CTRL);
208 * omap2_wait_clock_ready - wait for PLL to lock
210 * Returns 1 if the PLL locked, 0 if it failed to lock.
212 static int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name)
217 while (!(cm_read_reg(reg) & cval)) {
220 if (i == MAX_PLL_LOCK_WAIT) {
221 printk(KERN_ERR "Clock %s didn't lock in %d tries\n",
222 name, MAX_PLL_LOCK_WAIT);
228 pr_debug("Clock %s stable after %d loops\n", name, i);
230 return (i < MAX_PLL_LOCK_WAIT) ? 1 : 0;
234 /* Enable an APLL if off */
235 static void omap2_clk_fixed_enable(struct clk *clk)
239 apll_mask = EN_APLL_LOCKED << clk->enable_bit;
241 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
243 if ((cval & apll_mask) == apll_mask)
244 return; /* apll already enabled */
248 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
250 if (clk == &apll96_ck)
251 cval = OMAP24XX_ST_96M_APLL;
252 else if (clk == &apll54_ck)
253 cval = OMAP24XX_ST_54M_CLK;
255 omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
259 static void omap2_clk_wait_ready(struct clk *clk)
261 void __iomem *reg, *other_reg, *st_reg;
264 reg = clk->enable_reg;
265 if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1) ||
266 reg == OMAP_CM_REGADDR(CORE_MOD, OMAP24XX_CM_FCLKEN2))
267 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
268 else if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1) ||
269 reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2))
270 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
274 /* No check for DSS or cam clocks */
275 if (((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
276 if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
277 clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
278 clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
282 /* Check if both functional and interface clocks
284 bit = 1 << clk->enable_bit;
285 if (!(cm_read_reg(other_reg) & bit))
287 st_reg = (void __iomem *)(((u32)other_reg & ~0xf0) | 0x20); /* CM_IDLEST* */
289 omap2_wait_clock_ready(st_reg, bit, clk->name);
292 /* Enables clock without considering parent dependencies or use count
293 * REVISIT: Maybe change this to use clk->enable like on omap1?
295 static int _omap2_clk_enable(struct clk * clk)
299 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
302 if (unlikely(clk == &osc_ck)) {
307 if (unlikely(clk->enable_reg == 0)) {
308 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
313 if (clk->enable_reg == OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN)) {
314 omap2_clk_fixed_enable(clk);
318 regval32 = cm_read_reg(clk->enable_reg);
319 regval32 |= (1 << clk->enable_bit);
320 cm_write_reg(regval32, clk->enable_reg);
323 omap2_clk_wait_ready(clk);
329 static void omap2_clk_fixed_disable(struct clk *clk)
333 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
334 cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
335 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
338 /* Disables clock without considering parent dependencies or use count */
339 static void _omap2_clk_disable(struct clk *clk)
343 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
346 if (unlikely(clk == &osc_ck)) {
351 if (clk->enable_reg == 0) {
353 * 'Independent' here refers to a clock which is not
354 * controlled by its parent.
356 printk(KERN_ERR "clock: clk_disable called on independent "
357 "clock %s which has no enable_reg\n", clk->name);
361 if (clk->enable_reg == OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN)) {
362 omap2_clk_fixed_disable(clk);
366 regval32 = cm_read_reg(clk->enable_reg);
367 regval32 &= ~(1 << clk->enable_bit);
368 cm_write_reg(regval32, clk->enable_reg);
372 static int omap2_clk_enable(struct clk *clk)
376 if (clk->usecount++ == 0) {
377 if (likely((u32)clk->parent))
378 ret = omap2_clk_enable(clk->parent);
380 if (unlikely(ret != 0)) {
385 ret = _omap2_clk_enable(clk);
387 if (unlikely(ret != 0) && clk->parent) {
388 omap2_clk_disable(clk->parent);
396 static void omap2_clk_disable(struct clk *clk)
398 if (clk->usecount > 0 && !(--clk->usecount)) {
399 _omap2_clk_disable(clk);
400 if (likely((u32)clk->parent))
401 omap2_clk_disable(clk->parent);
406 * Uses the current prcm set to tell if a rate is valid.
407 * You can go slower, but not faster within a given rate set.
409 static u32 omap2_dpll_round_rate(unsigned long target_rate)
411 u32 high, low, core_clk_src;
413 core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
414 core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
416 if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */
417 high = curr_prcm_set->dpll_speed * 2;
418 low = curr_prcm_set->dpll_speed;
419 } else { /* DPLL clockout x 2 */
420 high = curr_prcm_set->dpll_speed;
421 low = curr_prcm_set->dpll_speed / 2;
424 #ifdef DOWN_VARIABLE_DPLL
425 if (target_rate > high)
430 if (target_rate > low)
438 static void omap2_dpll_recalc(struct clk *clk)
440 clk->rate = omap2_get_dpll_rate(clk);
446 * Used for clocks that are part of CLKSEL_xyz governed clocks.
447 * REVISIT: Maybe change to use clk->enable() functions like on omap1?
449 static void omap2_clksel_recalc(struct clk * clk)
451 u32 clksel1_core, div = 0;
453 clksel1_core = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1);
455 if ((clk == &dss1_fck) &&
456 (clksel1_core & OMAP24XX_CLKSEL_DSS1_MASK) == 0) {
460 if ((clk == &vlynq_fck) && cpu_is_omap2420() &&
461 (clksel1_core & OMAP2420_CLKSEL_VLYNQ_MASK) == CLKSEL_VLYNQ_96MHZ) {
465 div = omap2_clksel_get_divisor(clk);
469 if (unlikely(clk->rate == clk->parent->rate / div))
471 clk->rate = clk->parent->rate / div;
473 if (unlikely(clk->flags & RATE_PROPAGATES))
478 * Finds best divider value in an array based on the source and target
479 * rates. The divider array must be sorted with smallest divider first.
481 static inline u32 omap2_divider_from_table(u32 size, u32 *div_array,
482 u32 src_rate, u32 tgt_rate)
486 if (div_array == NULL)
489 for (i = 0; i < size; i++) {
490 test_rate = src_rate / *div_array;
491 if (test_rate <= tgt_rate)
496 return ~0; /* No acceptable divider */
500 * omap2_get_clksel_by_parent - return clksel struct for a given clk & parent
501 * @clk: OMAP struct clk ptr to inspect
502 * @src_clk: OMAP struct clk ptr of the parent clk to search for
504 * Scan the struct clksel array associated with the clock to find
505 * the element associated with the supplied parent clock address.
506 * Returns a pointer to the struct clksel on success or NULL on error.
508 const static struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
511 const struct clksel *clks;
516 for (clks = clk->clksel; clks->parent; clks++) {
517 if (clks->parent == src_clk)
518 break; /* Found the requested parent */
522 printk(KERN_ERR "clock: Could not find parent clock %s in "
523 "clksel array of clock %s\n", src_clk->name,
532 * omap2_clksel_round_rate - find divisor for the given clock and target rate.
533 * @clk: OMAP struct clk to use
534 * @target_rate: desired clock rate
535 * @new_div: ptr to where we should store the divisor
537 * Finds 'best' divider value in an array based on the source and target
538 * rates. The divider array must be sorted with smallest divider first.
539 * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
540 * they are only settable as part of virtual_prcm set.
542 * Returns the rounded clock rate or returns 0xffffffff on error.
544 static u32 omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate,
547 unsigned long test_rate;
548 const struct clksel *clks;
549 const struct clksel_rate *clkr;
552 printk(KERN_INFO "clock: clksel_round_rate for %s target_rate %ld\n",
553 clk->name, target_rate);
557 clks = omap2_get_clksel_by_parent(clk, clk->parent);
561 for (clkr = clks->rates; clkr->div; clkr++) {
562 if (!(clkr->flags & cpu_mask))
566 if (clkr->div <= last_div)
567 printk(KERN_ERR "clock: clksel_rate table not sorted "
568 "for clock %s", clk->name);
570 last_div = clkr->div;
572 test_rate = clk->parent->rate / clkr->div;
574 if (test_rate <= target_rate)
575 break; /* found it */
579 printk(KERN_ERR "clock: Could not find divisor for target "
580 "rate %ld for clock %s parent %s\n", target_rate,
581 clk->name, clk->parent->name);
585 *new_div = clkr->div;
587 printk(KERN_INFO "clock: new_div = %d, new_rate = %ld\n", *new_div,
588 (clk->parent->rate / clkr->div));
590 return (clk->parent->rate / clkr->div);
593 /* Given a clock and a rate apply a clock specific rounding function */
594 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
598 if (clk->flags & RATE_FIXED)
601 if (clk->flags & RATE_CKCTL)
602 return omap2_clksel_round_rate(clk, rate, &new_div);
604 if (clk->round_rate != 0)
605 return clk->round_rate(clk, rate);
610 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
612 u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
614 struct prcm_config tmpset;
617 local_irq_save(flags);
618 cur_rate = omap2_get_dpll_rate(&dpll_ck);
619 mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
620 mult &= OMAP24XX_CORE_CLK_SRC_MASK;
622 if ((rate == (cur_rate / 2)) && (mult == 2)) {
623 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
624 } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
625 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
626 } else if (rate != cur_rate) {
627 valid_rate = omap2_dpll_round_rate(rate);
628 if (valid_rate != rate)
632 low = curr_prcm_set->dpll_speed;
634 low = curr_prcm_set->dpll_speed / 2;
636 tmpset.cm_clksel1_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
637 tmpset.cm_clksel1_pll &= ~(OMAP24XX_DPLL_MULT_MASK |
638 OMAP24XX_DPLL_DIV_MASK);
639 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
640 tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
641 tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
643 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
644 mult = ((rate / 2) / 1000000);
645 done_rate = CORE_CLK_SRC_DPLL_X2;
647 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
648 mult = (rate / 1000000);
649 done_rate = CORE_CLK_SRC_DPLL;
651 tmpset.cm_clksel1_pll |= (div << OMAP24XX_DPLL_DIV_SHIFT);
652 tmpset.cm_clksel1_pll |= (mult << OMAP24XX_DPLL_MULT_SHIFT);
655 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
657 if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
660 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */
662 /* Force dll lock mode */
663 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
666 /* Errata: ret dll entry state */
667 omap2_init_memory_params(omap2_dll_force_needed());
668 omap2_reprogram_sdrc(done_rate, 0);
670 omap2_dpll_recalc(&dpll_ck);
674 local_irq_restore(flags);
679 * omap2_table_mpu_recalc - just return the MPU speed
680 * @clk: virt_prcm_set struct clk
682 * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
684 static void omap2_table_mpu_recalc(struct clk *clk)
686 clk->rate = curr_prcm_set->mpu_speed;
690 * Look for a rate equal or less than the target rate given a configuration set.
692 * What's not entirely clear is "which" field represents the key field.
693 * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
694 * just uses the ARM rates.
696 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
698 struct prcm_config * ptr;
701 if (clk != &virt_prcm_set)
704 highest_rate = -EINVAL;
706 for (ptr = rate_table; ptr->mpu_speed; ptr++) {
707 if (!(ptr->flags & cpu_mask))
709 if (ptr->xtal_speed != sys_ck.rate)
712 highest_rate = ptr->mpu_speed;
714 /* Can check only after xtal frequency check */
715 if (ptr->mpu_speed <= rate)
722 * omap2_clksel_to_divisor() - turn clksel field value into integer divider
723 * @clk: OMAP struct clk to use
724 * @field_val: register field value to find
726 * Given a struct clk of a rate-selectable clksel clock, and a register field
727 * value to search for, find the corresponding clock divisor. The register
728 * field value should be pre-masked and shifted down so the LSB is at bit 0
729 * before calling. Returns 0 on error
731 static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
733 const struct clksel *clks;
734 const struct clksel_rate *clkr;
736 clks = omap2_get_clksel_by_parent(clk, clk->parent);
740 for (clkr = clks->rates; clkr->div; clkr++) {
741 if ((clkr->flags & cpu_mask) && (clkr->val == field_val))
746 printk(KERN_ERR "clock: Could not find fieldval %d for "
747 "clock %s parent %s\n", field_val, clk->name,
756 * omap2_divisor_to_clksel() - turn clksel integer divisor into a field value
757 * @clk: OMAP struct clk to use
758 * @div: integer divisor to search for
760 * Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
761 * find the corresponding register field value. The return register value is
762 * the value before left-shifting. Returns 0xffffffff on error
764 static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
766 const struct clksel *clks;
767 const struct clksel_rate *clkr;
769 /* should never happen */
772 clks = omap2_get_clksel_by_parent(clk, clk->parent);
776 for (clkr = clks->rates; clkr->div; clkr++) {
777 if ((clkr->flags & cpu_mask) && (clkr->div == div))
782 printk(KERN_ERR "clock: Could not find divisor %d for "
783 "clock %s parent %s\n", div, clk->name,
792 * Returns the CLKSEL divider register value
794 static void __iomem *omap2_get_clksel(u32 *field_mask, struct clk *clk)
796 u32 div_off, mask = ~0;
797 void __iomem *div_addr = 0;
799 div_off = clk->rate_offset;
801 switch (clk->flags & SRC_RATE_SEL_MASK) {
803 div_addr = OMAP_CM_REGADDR(MPU_MOD, CM_CLKSEL);
804 mask = OMAP24XX_CLKSEL_MPU_MASK;
807 div_addr = OMAP_CM_REGADDR(OMAP24XX_DSP_MOD, CM_CLKSEL);
808 if (cpu_is_omap2420()) {
809 if (div_off == OMAP24XX_CLKSEL_DSP_SHIFT)
810 mask = OMAP24XX_CLKSEL_DSP_MASK;
811 else if (div_off == OMAP2420_CLKSEL_IVA_SHIFT)
812 mask = OMAP2420_CLKSEL_IVA_MASK;
813 else if (div_off == OMAP24XX_CLKSEL_DSP_IF_SHIFT)
814 mask = OMAP24XX_CLKSEL_DSP_IF_MASK;
815 } else if (cpu_is_omap2430()) {
816 if (div_off == OMAP24XX_CLKSEL_DSP_SHIFT)
817 mask = OMAP24XX_CLKSEL_DSP_MASK;
818 else if (div_off == OMAP24XX_CLKSEL_DSP_IF_SHIFT)
819 mask = OMAP24XX_CLKSEL_DSP_IF_MASK;
822 div_addr = OMAP_CM_REGADDR(GFX_MOD, CM_CLKSEL);
823 if (div_off == OMAP_CLKSEL_GFX_SHIFT)
824 mask = OMAP_CLKSEL_GFX_MASK;
827 div_addr = OMAP_CM_REGADDR(OMAP2430_MDM_MOD, CM_CLKSEL);
828 if (div_off == OMAP2430_CLKSEL_MDM_SHIFT)
829 mask = OMAP2430_CLKSEL_MDM_MASK;
831 case CM_SYSCLKOUT_SEL1:
832 div_addr = OMAP24XX_PRCM_CLKOUT_CTRL;
833 if (div_off == OMAP24XX_CLKOUT_DIV_SHIFT)
834 mask = OMAP24XX_CLKOUT_DIV_MASK;
835 else if (div_off == OMAP2420_CLKOUT2_DIV_SHIFT)
836 mask = OMAP2420_CLKOUT2_DIV_MASK;
839 div_addr = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL1);
841 case OMAP24XX_CLKSEL_L3_SHIFT:
842 mask = OMAP24XX_CLKSEL_L3_MASK;
844 case OMAP24XX_CLKSEL_L4_SHIFT:
845 mask = OMAP24XX_CLKSEL_L4_MASK;
847 case OMAP24XX_CLKSEL_DSS1_SHIFT:
848 mask = OMAP24XX_CLKSEL_DSS1_MASK;
850 case OMAP24XX_CLKSEL_DSS2_SHIFT:
851 mask = OMAP24XX_CLKSEL_DSS2_MASK;
853 case OMAP2420_CLKSEL_VLYNQ_SHIFT:
854 mask = OMAP2420_CLKSEL_VLYNQ_MASK;
856 case OMAP24XX_CLKSEL_SSI_SHIFT:
857 mask = OMAP24XX_CLKSEL_SSI_MASK;
859 case OMAP24XX_CLKSEL_USB_SHIFT:
860 mask = OMAP24XX_CLKSEL_USB_MASK;
865 if (unlikely((mask == ~0) || (div_addr == 0)))
875 * omap2_clksel_get_divisor - get current divider applied to parent clock.
876 * @clk: OMAP struct clk to use.
878 * Returns the integer divisor upon success or 0 on error.
880 static u32 omap2_clksel_get_divisor(struct clk *clk)
882 u32 field_mask, field_val;
883 void __iomem *div_addr;
885 div_addr = omap2_get_clksel(&field_mask, clk);
889 field_val = cm_read_reg(div_addr) & field_mask;
890 field_val >>= mask_to_shift(field_mask);
892 return omap2_clksel_to_divisor(clk, field_val);
895 /* Set the clock rate for a clock source */
896 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
899 u32 div_off, field_mask, field_val, reg_val, validrate;
901 void __iomem *div_addr;
903 if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
905 return omap2_reprogram_dpll(clk, rate);
907 /* Isolate control register */
908 div_off = clk->rate_offset;
910 validrate = omap2_clksel_round_rate(clk, rate, &new_div);
911 if (validrate != rate)
914 div_addr = omap2_get_clksel(&field_mask, clk);
918 field_val = omap2_divisor_to_clksel(clk, new_div);
922 reg_val = cm_read_reg(div_addr);
923 reg_val &= ~field_mask;
924 reg_val |= (field_val << div_off);
925 cm_write_reg(reg_val, div_addr);
927 clk->rate = clk->parent->rate / new_div;
929 if (clk->flags & DELAYED_APP) {
930 prm_write_reg(OMAP24XX_VALID_CONFIG,
931 OMAP24XX_PRCM_CLKCFG_CTRL);
935 } else if (clk->set_rate != 0) {
936 ret = clk->set_rate(clk, rate);
939 if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
945 /* Converts encoded control register address into a full address */
946 static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
947 struct clk *src_clk, u32 *field_mask,
948 struct clk *clk, u32 *parent_div)
950 u32 val = ~0, mask = 0;
951 void __iomem *src_reg_addr = 0;
955 reg_offset = clk->src_offset;
957 /* Find target control register.*/
958 switch (clk->flags & SRC_RATE_SEL_MASK) {
960 src_reg_addr = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL1);
961 if (reg_offset == OMAP24XX_CLKSEL_DSS2_SHIFT) {
962 mask = OMAP24XX_CLKSEL_DSS2_MASK;
963 if (src_clk == &sys_ck)
964 val = CLKSEL_DSS2_SYSCLK;
965 else if (src_clk == &func_48m_ck)
966 val = CLKSEL_DSS2_48MHZ;
968 WARN_ON(1); /* unknown src_clk */
969 } else if (reg_offset == OMAP24XX_CLKSEL_DSS1_SHIFT) {
970 mask = OMAP24XX_CLKSEL_DSS1_MASK;
971 if (src_clk == &sys_ck) {
972 val = CLKSEL_DSS1_SYSCLK;
973 } else if (src_clk == &core_ck) {
974 val = CLKSEL_DSS1_CORECLK_16;
977 WARN_ON(1); /* unknown src clk */
979 } else if ((reg_offset == OMAP2420_CLKSEL_VLYNQ_SHIFT) &&
981 mask = OMAP2420_CLKSEL_VLYNQ_MASK;
982 if (src_clk == &func_96m_ck) {
983 val = CLKSEL_VLYNQ_96MHZ;
984 } else if (src_clk == &core_ck) {
985 val = CLKSEL_VLYNQ_CORECLK_16;
988 WARN_ON(1); /* unknown src_clk */
991 WARN_ON(1); /* unknown reg_offset */
995 WARN_ON(reg_offset < OMAP24XX_CLKSEL_GPT2_SHIFT ||
996 reg_offset > OMAP24XX_CLKSEL_GPT12_SHIFT);
997 src_reg_addr = OMAP_CM_REGADDR(CORE_MOD, CM_CLKSEL2);
998 mask = OMAP24XX_CLKSEL_GPT2_MASK;
999 mask <<= (reg_offset - OMAP24XX_CLKSEL_GPT2_SHIFT);
1000 if (src_clk == &func_32k_ck)
1001 val = CLKSEL_GPT_32K;
1002 else if (src_clk == &sys_ck)
1003 val = CLKSEL_GPT_SYSCLK;
1004 else if (src_clk == &alt_ck)
1005 val = CLKSEL_GPT_EXTALTCLK;
1007 WARN_ON(1); /* unknown src_clk */
1010 WARN_ON(reg_offset != 0); /* unknown reg_offset */
1011 src_reg_addr = OMAP_CM_REGADDR(WKUP_MOD, CM_CLKSEL);
1012 mask = OMAP24XX_CLKSEL_GPT1_MASK;
1013 if (src_clk == &func_32k_ck)
1014 val = CLKSEL_GPT_32K;
1015 else if (src_clk == &sys_ck)
1016 val = CLKSEL_GPT_SYSCLK;
1017 else if (src_clk == &alt_ck)
1018 val = CLKSEL_GPT_EXTALTCLK;
1020 WARN_ON(1); /* unknown src_clk */
1023 src_reg_addr = OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL1);
1024 if (reg_offset == 0x3) {
1025 mask = OMAP24XX_48M_SOURCE;
1026 if (src_clk == &apll96_ck)
1027 val = CLK_48M_SOURCE_APLL;
1028 else if (src_clk == &alt_ck)
1029 val = CLK_48M_SOURCE_EXTALTCLK;
1031 WARN_ON(1); /* unknown src_clk */
1033 else if (reg_offset == 0x5) {
1034 mask = OMAP24XX_54M_SOURCE;
1035 if (src_clk == &apll54_ck)
1036 val = CLK_54M_SOURCE_APLL;
1037 else if (src_clk == &alt_ck)
1038 val = CLK_54M_SOURCE_EXTALTCLK;
1040 WARN_ON(1); /* unknown src_clk */
1042 WARN_ON(1); /* unknown reg_offset */
1046 WARN_ON(reg_offset != 0);
1047 src_reg_addr = OMAP_CM_REGADDR(PLL_MOD, CM_CLKSEL2);
1048 mask = OMAP24XX_CORE_CLK_SRC_MASK;
1049 if (src_clk == &func_32k_ck)
1050 val = CORE_CLK_SRC_32K;
1051 else if (src_clk == &dpll_ck)
1052 val = CORE_CLK_SRC_DPLL_X2;
1054 WARN_ON(1); /* unknown src_clk */
1056 case CM_SYSCLKOUT_SEL1:
1057 src_reg_addr = OMAP24XX_PRCM_CLKOUT_CTRL;
1059 if (reg_offset == OMAP24XX_CLKOUT_SOURCE_SHIFT) {
1060 mask = OMAP24XX_CLKOUT_SOURCE_MASK;
1061 } else if (reg_offset == OMAP2420_CLKOUT2_SOURCE_SHIFT) {
1062 mask = OMAP2420_CLKOUT2_SOURCE_MASK;
1064 WARN_ON(1); /* unknown reg_offset */
1067 if (src_clk == &dpll_ck)
1069 else if (src_clk == &sys_ck)
1071 else if (src_clk == &func_96m_ck)
1073 else if (src_clk == &func_54m_ck)
1076 WARN_ON(1); /* unknown src_clk */
1080 if (val == ~0) /* Catch errors in offset */
1083 *src_addr = src_reg_addr;
1092 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
1094 void __iomem *src_addr;
1095 u32 field_val, field_mask, reg_val, parent_div;
1097 if (unlikely(clk->flags & CONFIG_PARTICIPANT))
1100 if (unlikely(!(clk->flags & SRC_SEL_MASK)))
1103 field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
1104 &field_mask, clk, &parent_div);
1108 if (clk->usecount > 0)
1109 _omap2_clk_disable(clk);
1111 /* Set new source value (previous dividers if any in effect) */
1112 reg_val = __raw_readl(src_addr) & ~field_mask;
1113 reg_val |= (field_val << clk->src_offset);
1114 __raw_writel(reg_val, src_addr);
1117 if (clk->flags & DELAYED_APP) {
1118 prm_write_reg(OMAP24XX_VALID_CONFIG,
1119 OMAP24XX_PRCM_CLKCFG_CTRL);
1123 if (clk->usecount > 0)
1124 _omap2_clk_enable(clk);
1126 clk->parent = new_parent;
1128 /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
1129 clk->rate = new_parent->rate;
1132 clk->rate /= parent_div;
1134 if (unlikely(clk->flags & RATE_PROPAGATES))
1135 propagate_rate(clk);
1140 /* Sets basic clocks based on the specified rate */
1141 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
1143 u32 flags, cur_rate, done_rate, bypass = 0, tmp;
1144 struct prcm_config *prcm;
1145 unsigned long found_speed = 0;
1147 if (clk != &virt_prcm_set)
1150 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1151 if (!(prcm->flags & cpu_mask))
1154 if (prcm->xtal_speed != sys_ck.rate)
1157 if (prcm->mpu_speed <= rate) {
1158 found_speed = prcm->mpu_speed;
1164 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
1169 curr_prcm_set = prcm;
1170 cur_rate = omap2_get_dpll_rate(&dpll_ck);
1172 if (prcm->dpll_speed == cur_rate / 2) {
1173 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
1174 } else if (prcm->dpll_speed == cur_rate * 2) {
1175 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
1176 } else if (prcm->dpll_speed != cur_rate) {
1177 local_irq_save(flags);
1179 if (prcm->dpll_speed == prcm->xtal_speed)
1182 if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
1183 CORE_CLK_SRC_DPLL_X2)
1184 done_rate = CORE_CLK_SRC_DPLL_X2;
1186 done_rate = CORE_CLK_SRC_DPLL;
1189 cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
1191 /* dsp + iva1 div(2420), iva2.1(2430) */
1192 cm_write_mod_reg(prcm->cm_clksel_dsp,
1193 OMAP24XX_DSP_MOD, CM_CLKSEL);
1195 cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
1197 /* Major subsystem dividers */
1198 tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
1199 cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD, CM_CLKSEL1);
1200 if (cpu_is_omap2430())
1201 cm_write_mod_reg(prcm->cm_clksel_mdm,
1202 OMAP2430_MDM_MOD, CM_CLKSEL);
1204 /* x2 to enter init_mem */
1205 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
1207 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
1210 omap2_init_memory_params(omap2_dll_force_needed());
1211 omap2_reprogram_sdrc(done_rate, 0);
1213 local_irq_restore(flags);
1215 omap2_dpll_recalc(&dpll_ck);
1220 /*-------------------------------------------------------------------------
1221 * Omap2 clock reset and init functions
1222 *-------------------------------------------------------------------------*/
1224 #ifdef CONFIG_OMAP_RESET_CLOCKS
1225 static void __init omap2_clk_disable_unused(struct clk *clk)
1229 regval32 = cm_read_reg(clk->enable_reg);
1230 if ((regval32 & (1 << clk->enable_bit)) == 0)
1233 printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
1234 _omap2_clk_disable(clk);
1237 #define omap2_clk_disable_unused NULL
1240 static struct clk_functions omap2_clk_functions = {
1241 .clk_enable = omap2_clk_enable,
1242 .clk_disable = omap2_clk_disable,
1243 .clk_round_rate = omap2_clk_round_rate,
1244 .clk_set_rate = omap2_clk_set_rate,
1245 .clk_set_parent = omap2_clk_set_parent,
1246 .clk_disable_unused = omap2_clk_disable_unused,
1249 static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
1251 u32 div, aplls, sclk = 13000000;
1253 aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
1254 aplls &= OMAP24XX_APLLS_CLKIN_MASK;
1255 aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
1257 if (aplls == APLLS_CLKIN_19_2MHZ)
1259 else if (aplls == APLLS_CLKIN_13MHZ)
1261 else if (aplls == APLLS_CLKIN_12MHZ)
1264 div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
1265 div &= OMAP_SYSCLKDIV_MASK;
1266 div >>= sys->rate_offset;
1268 osc->rate = sclk * div;
1273 * Set clocks for bypass mode for reboot to work.
1275 void omap2_clk_prepare_for_reboot(void)
1279 if (vclk == NULL || sclk == NULL)
1282 rate = clk_get_rate(sclk);
1283 clk_set_rate(vclk, rate);
1287 * Switch the MPU rate if specified on cmdline.
1288 * We cannot do this early until cmdline is parsed.
1290 static int __init omap2_clk_arch_init(void)
1295 if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1296 printk(KERN_ERR "Could not find matching MPU rate\n");
1298 recalculate_root_clocks();
1300 printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1301 "%ld.%01ld/%ld/%ld MHz\n",
1302 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1303 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1307 arch_initcall(omap2_clk_arch_init);
1309 int __init omap2_clk_init(void)
1311 struct prcm_config *prcm;
1315 if (cpu_is_omap242x())
1316 cpu_mask = RATE_IN_242X;
1317 else if (cpu_is_omap2430())
1318 cpu_mask = RATE_IN_243X;
1320 clk_init(&omap2_clk_functions);
1321 omap2_get_crystal_rate(&osc_ck, &sys_ck);
1323 for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1326 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1327 clk_register(*clkp);
1331 if ((*clkp)->flags & CLOCK_IN_OMAP243X && (cpu_is_omap2430() || cpu_is_omap34xx())) {
1332 clk_register(*clkp);
1337 /* Check the MPU rate set by bootloader */
1338 clkrate = omap2_get_dpll_rate(&dpll_ck);
1339 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1340 if (!(prcm->flags & cpu_mask))
1342 if (prcm->xtal_speed != sys_ck.rate)
1344 if (prcm->dpll_speed <= clkrate)
1347 curr_prcm_set = prcm;
1349 recalculate_root_clocks();
1351 printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1352 "%ld.%01ld/%ld/%ld MHz\n",
1353 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1354 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1357 * Only enable those clocks we will need, let the drivers
1358 * enable other clocks as necessary
1360 clk_enable(&sync_32k_ick);
1361 clk_enable(&omapctrl_ick);
1363 /* Force the APLLs always active. The clocks are idled
1364 * automatically by hardware. */
1365 clk_enable(&apll96_ck);
1366 clk_enable(&apll54_ck);
1368 if (cpu_is_omap2430())
1369 clk_enable(&sdrc_ick);
1371 /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
1372 vclk = clk_get(NULL, "virt_prcm_set");
1373 sclk = clk_get(NULL, "sys_ck");