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 * Copyright (C) 2007 Texas Instruments, Inc.
12 * Copyright (C) 2007 Nokia Corporation
15 * Based on omap1 clock.c, Copyright (C) 2004 - 2005 Nokia corporation
16 * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
18 * This program is free software; you can redistribute it and/or modify
19 * it under the terms of the GNU General Public License version 2 as
20 * published by the Free Software Foundation.
22 #include <linux/module.h>
23 #include <linux/kernel.h>
24 #include <linux/device.h>
25 #include <linux/list.h>
26 #include <linux/errno.h>
27 #include <linux/delay.h>
28 #include <linux/clk.h>
32 #include <asm/arch/clock.h>
33 #include <asm/arch/sram.h>
34 #include <asm/div64.h>
39 #include "prm_regbits_24xx.h"
41 #include "cm_regbits_24xx.h"
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_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
50 #define APLLS_CLKIN_19_2MHZ 0
51 #define APLLS_CLKIN_13MHZ 2
52 #define APLLS_CLKIN_12MHZ 3
54 #define MAX_PLL_LOCK_WAIT 100000
56 //#define DOWN_VARIABLE_DPLL 1 /* Experimental */
58 static struct prcm_config *curr_prcm_set;
59 static struct clk *vclk;
60 static struct clk *sclk;
63 /*-------------------------------------------------------------------------
64 * Omap2 specific clock functions
65 *-------------------------------------------------------------------------*/
67 static inline u8 mask_to_shift(u32 mask)
73 * omap2_init_clksel_parent - set a clksel clk's parent field from the hardware
74 * @clk: OMAP clock struct ptr to use
76 * Given a pointer to a source-selectable struct clk, read the hardware
77 * register and determine what its parent is currently set to. Update the
78 * clk->parent field with the appropriate clk ptr.
80 static void omap2_init_clksel_parent(struct clk *clk)
82 const struct clksel *clks;
83 const struct clksel_rate *clkr;
89 /* XXX Should be __raw_readl for non-CM 3430 clocks ? */
90 r = cm_read_reg(clk->clksel_reg) & clk->clksel_mask;
91 r >>= mask_to_shift(clk->clksel_mask);
93 for (clks = clk->clksel; clks->parent && !found; clks++) {
94 for (clkr = clks->rates; clkr->div && !found; clkr++) {
95 if ((clkr->flags & cpu_mask) && (clkr->val == r)) {
96 if (clk->parent != clks->parent) {
97 pr_debug("clock: inited %s parent "
99 clk->name, clks->parent->name,
100 ((clk->parent->name) ?
101 clk->parent->name : "NULL"));
102 clk->parent = clks->parent;
110 printk(KERN_ERR "clock: init parent: could not find "
111 "regval %0x for clock %s\n", r, clk->name);
116 /* Recalculate SYST_CLK */
117 static void omap2_sys_clk_recalc(struct clk * clk)
121 if (!cpu_is_omap34xx()) {
122 div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
123 /* Test if ext clk divided by 1 or 2 */
124 div &= OMAP_SYSCLKDIV_MASK;
125 div >>= OMAP_SYSCLKDIV_SHIFT;
126 clk->rate = (clk->parent->rate / div);
131 static u32 omap2_get_dpll_rate(struct clk * tclk)
134 int dpll_mult, dpll_div, amult;
137 dpll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
139 dpll_mult = dpll & OMAP24XX_DPLL_MULT_MASK;
140 dpll_mult >>= OMAP24XX_DPLL_MULT_SHIFT; /* 10 bits */
141 dpll_div = dpll & OMAP24XX_DPLL_DIV_MASK;
142 dpll_div >>= OMAP24XX_DPLL_DIV_SHIFT; /* 4 bits */
143 dpll_clk = (long long)tclk->parent->rate * dpll_mult;
144 do_div(dpll_clk, dpll_div + 1);
145 amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
146 amult &= OMAP24XX_CORE_CLK_SRC_MASK;
153 * Used for clocks that have the same value as the parent clock,
154 * divided by some factor
156 static void omap2_fixed_divisor_recalc(struct clk *clk)
158 WARN_ON(!clk->fixed_div);
160 clk->rate = clk->parent->rate / clk->fixed_div;
162 if (clk->flags & RATE_PROPAGATES)
166 static void omap2_set_osc_ck(int enable)
170 pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
173 prm_write_reg(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
174 OMAP24XX_PRCM_CLKSRC_CTRL);
176 prm_write_reg(pcc | OMAP_AUTOEXTCLKMODE_MASK,
177 OMAP24XX_PRCM_CLKSRC_CTRL);
181 * omap2_wait_clock_ready - wait for PLL to lock
183 * Returns 1 if the PLL locked, 0 if it failed to lock.
185 static int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name)
190 while (!(cm_read_reg(reg) & cval)) {
193 if (i == MAX_PLL_LOCK_WAIT) {
194 printk(KERN_ERR "Clock %s didn't lock in %d tries\n",
195 name, MAX_PLL_LOCK_WAIT);
201 pr_debug("Clock %s stable after %d loops\n", name, i);
203 return (i < MAX_PLL_LOCK_WAIT) ? 1 : 0;
207 /* Enable an APLL if off */
208 static void omap2_clk_fixed_enable(struct clk *clk)
212 apll_mask = EN_APLL_LOCKED << clk->enable_bit;
214 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
216 if ((cval & apll_mask) == apll_mask)
217 return; /* apll already enabled */
221 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
223 if (clk == &apll96_ck)
224 cval = OMAP24XX_ST_96M_APLL;
225 else if (clk == &apll54_ck)
226 cval = OMAP24XX_ST_54M_CLK;
228 omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
232 static void omap2_clk_wait_ready(struct clk *clk)
234 void __iomem *reg, *other_reg, *st_reg;
237 reg = clk->enable_reg;
238 if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1) ||
239 reg == OMAP_CM_REGADDR(CORE_MOD, OMAP24XX_CM_FCLKEN2))
240 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
241 else if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1) ||
242 reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2))
243 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
247 /* No check for DSS or cam clocks */
248 if (((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
249 if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
250 clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
251 clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
255 /* Check if both functional and interface clocks
257 bit = 1 << clk->enable_bit;
258 if (!(cm_read_reg(other_reg) & bit))
260 st_reg = (void __iomem *)(((u32)other_reg & ~0xf0) | 0x20); /* CM_IDLEST* */
262 omap2_wait_clock_ready(st_reg, bit, clk->name);
265 /* Enables clock without considering parent dependencies or use count
266 * REVISIT: Maybe change this to use clk->enable like on omap1?
268 static int _omap2_clk_enable(struct clk * clk)
272 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
275 if (unlikely(clk == &osc_ck)) {
280 if (unlikely(clk->enable_reg == 0)) {
281 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
286 if (clk->enable_reg == OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN)) {
287 omap2_clk_fixed_enable(clk);
291 regval32 = cm_read_reg(clk->enable_reg);
292 regval32 |= (1 << clk->enable_bit);
293 cm_write_reg(regval32, clk->enable_reg);
296 omap2_clk_wait_ready(clk);
302 static void omap2_clk_fixed_disable(struct clk *clk)
306 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
307 cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
308 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
311 /* Disables clock without considering parent dependencies or use count */
312 static void _omap2_clk_disable(struct clk *clk)
316 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
319 if (unlikely(clk == &osc_ck)) {
324 if (clk->enable_reg == 0) {
326 * 'Independent' here refers to a clock which is not
327 * controlled by its parent.
329 printk(KERN_ERR "clock: clk_disable called on independent "
330 "clock %s which has no enable_reg\n", clk->name);
334 if (clk->enable_reg == OMAP_CM_REGADDR(PLL_MOD, CM_CLKEN)) {
335 omap2_clk_fixed_disable(clk);
339 regval32 = cm_read_reg(clk->enable_reg);
340 regval32 &= ~(1 << clk->enable_bit);
341 cm_write_reg(regval32, clk->enable_reg);
345 static int omap2_clk_enable(struct clk *clk)
349 if (clk->usecount++ == 0) {
350 if (likely((u32)clk->parent))
351 ret = omap2_clk_enable(clk->parent);
353 if (unlikely(ret != 0)) {
358 ret = _omap2_clk_enable(clk);
360 if (unlikely(ret != 0) && clk->parent) {
361 omap2_clk_disable(clk->parent);
369 static void omap2_clk_disable(struct clk *clk)
371 if (clk->usecount > 0 && !(--clk->usecount)) {
372 _omap2_clk_disable(clk);
373 if (likely((u32)clk->parent))
374 omap2_clk_disable(clk->parent);
379 * Uses the current prcm set to tell if a rate is valid.
380 * You can go slower, but not faster within a given rate set.
382 static u32 omap2_dpll_round_rate(unsigned long target_rate)
384 u32 high, low, core_clk_src;
386 core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
387 core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
389 if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */
390 high = curr_prcm_set->dpll_speed * 2;
391 low = curr_prcm_set->dpll_speed;
392 } else { /* DPLL clockout x 2 */
393 high = curr_prcm_set->dpll_speed;
394 low = curr_prcm_set->dpll_speed / 2;
397 #ifdef DOWN_VARIABLE_DPLL
398 if (target_rate > high)
403 if (target_rate > low)
411 static void omap2_dpll_recalc(struct clk *clk)
413 clk->rate = omap2_get_dpll_rate(clk);
419 * Used for clocks that are part of CLKSEL_xyz governed clocks.
420 * REVISIT: Maybe change to use clk->enable() functions like on omap1?
422 static void omap2_clksel_recalc(struct clk * clk)
426 pr_debug("clock: recalc'ing clksel clk %s\n", clk->name);
428 div = omap2_clksel_get_divisor(clk);
432 if (unlikely(clk->rate == clk->parent->rate / div))
434 clk->rate = clk->parent->rate / div;
436 pr_debug("clock: new clock rate is %ld (div %d)\n", clk->rate, div);
438 if (unlikely(clk->flags & RATE_PROPAGATES))
443 * omap2_get_clksel_by_parent - return clksel struct for a given clk & parent
444 * @clk: OMAP struct clk ptr to inspect
445 * @src_clk: OMAP struct clk ptr of the parent clk to search for
447 * Scan the struct clksel array associated with the clock to find
448 * the element associated with the supplied parent clock address.
449 * Returns a pointer to the struct clksel on success or NULL on error.
451 const static struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
454 const struct clksel *clks;
459 for (clks = clk->clksel; clks->parent; clks++) {
460 if (clks->parent == src_clk)
461 break; /* Found the requested parent */
465 printk(KERN_ERR "clock: Could not find parent clock %s in "
466 "clksel array of clock %s\n", src_clk->name,
475 * omap2_clksel_round_rate_div - find divisor for the given clock and rate
476 * @clk: OMAP struct clk to use
477 * @target_rate: desired clock rate
478 * @new_div: ptr to where we should store the divisor
480 * Finds 'best' divider value in an array based on the source and target
481 * rates. The divider array must be sorted with smallest divider first.
482 * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
483 * they are only settable as part of virtual_prcm set.
485 * Returns the rounded clock rate or returns 0xffffffff on error.
487 static u32 omap2_clksel_round_rate_div(struct clk *clk,
488 unsigned long target_rate,
491 unsigned long test_rate;
492 const struct clksel *clks;
493 const struct clksel_rate *clkr;
496 printk(KERN_INFO "clock: clksel_round_rate_div: %s target_rate %ld\n",
497 clk->name, target_rate);
501 clks = omap2_get_clksel_by_parent(clk, clk->parent);
505 for (clkr = clks->rates; clkr->div; clkr++) {
506 if (!(clkr->flags & cpu_mask))
510 if (clkr->div <= last_div)
511 printk(KERN_ERR "clock: clksel_rate table not sorted "
512 "for clock %s", clk->name);
514 last_div = clkr->div;
516 test_rate = clk->parent->rate / clkr->div;
518 if (test_rate <= target_rate)
519 break; /* found it */
523 printk(KERN_ERR "clock: Could not find divisor for target "
524 "rate %ld for clock %s parent %s\n", target_rate,
525 clk->name, clk->parent->name);
529 *new_div = clkr->div;
531 printk(KERN_INFO "clock: new_div = %d, new_rate = %ld\n", *new_div,
532 (clk->parent->rate / clkr->div));
534 return (clk->parent->rate / clkr->div);
538 * omap2_clksel_round_rate - find rounded rate for the given clock and rate
539 * @clk: OMAP struct clk to use
540 * @target_rate: desired clock rate
542 * Compatibility wrapper for OMAP clock framework
543 * Finds best target rate based on the source clock and possible dividers.
544 * rates. The divider array must be sorted with smallest divider first.
545 * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
546 * they are only settable as part of virtual_prcm set.
548 * Returns the rounded clock rate or returns 0xffffffff on error.
550 static long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
554 return omap2_clksel_round_rate_div(clk, target_rate, &new_div);
558 /* Given a clock and a rate apply a clock specific rounding function */
559 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
561 if (clk->round_rate != 0)
562 return clk->round_rate(clk, rate);
564 if (clk->flags & RATE_FIXED)
565 printk(KERN_ERR "clock: generic omap2_clk_round_rate called "
566 "on fixed-rate clock %s\n", clk->name);
571 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
573 u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
575 struct prcm_config tmpset;
578 local_irq_save(flags);
579 cur_rate = omap2_get_dpll_rate(&dpll_ck);
580 mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
581 mult &= OMAP24XX_CORE_CLK_SRC_MASK;
583 if ((rate == (cur_rate / 2)) && (mult == 2)) {
584 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
585 } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
586 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
587 } else if (rate != cur_rate) {
588 valid_rate = omap2_dpll_round_rate(rate);
589 if (valid_rate != rate)
593 low = curr_prcm_set->dpll_speed;
595 low = curr_prcm_set->dpll_speed / 2;
597 tmpset.cm_clksel1_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
598 tmpset.cm_clksel1_pll &= ~(OMAP24XX_DPLL_MULT_MASK |
599 OMAP24XX_DPLL_DIV_MASK);
600 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
601 tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
602 tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
604 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
605 mult = ((rate / 2) / 1000000);
606 done_rate = CORE_CLK_SRC_DPLL_X2;
608 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
609 mult = (rate / 1000000);
610 done_rate = CORE_CLK_SRC_DPLL;
612 tmpset.cm_clksel1_pll |= (div << OMAP24XX_DPLL_DIV_SHIFT);
613 tmpset.cm_clksel1_pll |= (mult << OMAP24XX_DPLL_MULT_SHIFT);
616 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
618 if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
621 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */
623 /* Force dll lock mode */
624 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
627 /* Errata: ret dll entry state */
628 omap2_init_memory_params(omap2_dll_force_needed());
629 omap2_reprogram_sdrc(done_rate, 0);
631 omap2_dpll_recalc(&dpll_ck);
635 local_irq_restore(flags);
640 * omap2_table_mpu_recalc - just return the MPU speed
641 * @clk: virt_prcm_set struct clk
643 * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
645 static void omap2_table_mpu_recalc(struct clk *clk)
647 clk->rate = curr_prcm_set->mpu_speed;
651 * Look for a rate equal or less than the target rate given a configuration set.
653 * What's not entirely clear is "which" field represents the key field.
654 * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
655 * just uses the ARM rates.
657 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
659 struct prcm_config * ptr;
662 if (clk != &virt_prcm_set)
665 highest_rate = -EINVAL;
667 for (ptr = rate_table; ptr->mpu_speed; ptr++) {
668 if (!(ptr->flags & cpu_mask))
670 if (ptr->xtal_speed != sys_ck.rate)
673 highest_rate = ptr->mpu_speed;
675 /* Can check only after xtal frequency check */
676 if (ptr->mpu_speed <= rate)
683 * omap2_clksel_to_divisor() - turn clksel field value into integer divider
684 * @clk: OMAP struct clk to use
685 * @field_val: register field value to find
687 * Given a struct clk of a rate-selectable clksel clock, and a register field
688 * value to search for, find the corresponding clock divisor. The register
689 * field value should be pre-masked and shifted down so the LSB is at bit 0
690 * before calling. Returns 0 on error
692 static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
694 const struct clksel *clks;
695 const struct clksel_rate *clkr;
697 clks = omap2_get_clksel_by_parent(clk, clk->parent);
701 for (clkr = clks->rates; clkr->div; clkr++) {
702 if ((clkr->flags & cpu_mask) && (clkr->val == field_val))
707 printk(KERN_ERR "clock: Could not find fieldval %d for "
708 "clock %s parent %s\n", field_val, clk->name,
717 * omap2_divisor_to_clksel() - turn clksel integer divisor into a field value
718 * @clk: OMAP struct clk to use
719 * @div: integer divisor to search for
721 * Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
722 * find the corresponding register field value. The return register value is
723 * the value before left-shifting. Returns 0xffffffff on error
725 static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
727 const struct clksel *clks;
728 const struct clksel_rate *clkr;
730 /* should never happen */
733 clks = omap2_get_clksel_by_parent(clk, clk->parent);
737 for (clkr = clks->rates; clkr->div; clkr++) {
738 if ((clkr->flags & cpu_mask) && (clkr->div == div))
743 printk(KERN_ERR "clock: Could not find divisor %d for "
744 "clock %s parent %s\n", div, clk->name,
753 * omap2_get_clksel - find clksel register addr & field mask for a clk
754 * @clk: struct clk to use
755 * @field_mask: ptr to u32 to store the register field mask
757 * Returns the address of the clksel register upon success or NULL on error.
759 static void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
761 if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
764 *field_mask = clk->clksel_mask;
766 return clk->clksel_reg;
770 * omap2_clksel_get_divisor - get current divider applied to parent clock.
771 * @clk: OMAP struct clk to use.
773 * Returns the integer divisor upon success or 0 on error.
775 static u32 omap2_clksel_get_divisor(struct clk *clk)
777 u32 field_mask, field_val;
778 void __iomem *div_addr;
780 div_addr = omap2_get_clksel(clk, &field_mask);
784 field_val = cm_read_reg(div_addr) & field_mask;
785 field_val >>= mask_to_shift(field_mask);
787 return omap2_clksel_to_divisor(clk, field_val);
790 /* Set the clock rate for a clock source */
791 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
794 u32 field_mask, field_val, reg_val, new_div = 0;
795 unsigned long validrate;
796 void __iomem *div_addr;
798 if (!(clk->flags & CONFIG_PARTICIPANT) && (clk->flags & RATE_CKCTL)) {
800 return omap2_reprogram_dpll(clk, rate);
802 validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
803 if (validrate != rate)
806 div_addr = omap2_get_clksel(clk, &field_mask);
810 field_val = omap2_divisor_to_clksel(clk, new_div);
814 reg_val = cm_read_reg(div_addr);
815 reg_val &= ~field_mask;
816 reg_val |= (field_val << mask_to_shift(field_mask));
817 cm_write_reg(reg_val, div_addr);
819 clk->rate = clk->parent->rate / new_div;
821 if (clk->flags & DELAYED_APP) {
822 prm_write_reg(OMAP24XX_VALID_CONFIG,
823 OMAP24XX_PRCM_CLKCFG_CTRL);
827 } else if (clk->set_rate != 0) {
828 ret = clk->set_rate(clk, rate);
831 if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
838 * Converts encoded control register address into a full address
839 * On error, *src_addr will be returned as 0.
841 static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
842 struct clk *src_clk, u32 *field_mask,
843 struct clk *clk, u32 *parent_div)
845 const struct clksel *clks;
846 const struct clksel_rate *clkr;
851 clks = omap2_get_clksel_by_parent(clk, src_clk);
855 for (clkr = clks->rates; clkr->div; clkr++) {
856 if (clkr->flags & (cpu_mask | DEFAULT_RATE))
857 break; /* Found the default rate for this platform */
861 printk(KERN_ERR "clock: Could not find default rate for "
862 "clock %s parent %s\n", clk->name,
863 src_clk->parent->name);
867 /* Should never happen. Add a clksel mask to the struct clk. */
868 WARN_ON(clk->clksel_mask == 0);
870 *field_mask = clk->clksel_mask;
871 *src_addr = clk->clksel_reg;
872 *parent_div = clkr->div;
877 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
879 void __iomem *src_addr;
880 u32 field_val, field_mask, reg_val, parent_div;
882 if (unlikely(clk->flags & CONFIG_PARTICIPANT))
885 if (unlikely(!(clk->flags & SRC_SEL_MASK)))
888 field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
889 &field_mask, clk, &parent_div);
893 if (clk->usecount > 0)
894 _omap2_clk_disable(clk);
896 /* Set new source value (previous dividers if any in effect) */
897 reg_val = __raw_readl(src_addr) & ~field_mask;
898 reg_val |= (field_val << mask_to_shift(field_mask));
899 __raw_writel(reg_val, src_addr);
902 if (clk->flags & DELAYED_APP) {
903 prm_write_reg(OMAP24XX_VALID_CONFIG,
904 OMAP24XX_PRCM_CLKCFG_CTRL);
908 if (clk->usecount > 0)
909 _omap2_clk_enable(clk);
911 clk->parent = new_parent;
913 /* SRC_RATE_SEL_MASK clocks follow their parents rates.*/
914 clk->rate = new_parent->rate;
917 clk->rate /= parent_div;
919 pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
920 clk->name, clk->parent->name, clk->rate);
922 if (unlikely(clk->flags & RATE_PROPAGATES))
928 /* Sets basic clocks based on the specified rate */
929 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
931 u32 flags, cur_rate, done_rate, bypass = 0, tmp;
932 struct prcm_config *prcm;
933 unsigned long found_speed = 0;
935 if (clk != &virt_prcm_set)
938 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
939 if (!(prcm->flags & cpu_mask))
942 if (prcm->xtal_speed != sys_ck.rate)
945 if (prcm->mpu_speed <= rate) {
946 found_speed = prcm->mpu_speed;
952 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
957 curr_prcm_set = prcm;
958 cur_rate = omap2_get_dpll_rate(&dpll_ck);
960 if (prcm->dpll_speed == cur_rate / 2) {
961 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
962 } else if (prcm->dpll_speed == cur_rate * 2) {
963 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
964 } else if (prcm->dpll_speed != cur_rate) {
965 local_irq_save(flags);
967 if (prcm->dpll_speed == prcm->xtal_speed)
970 if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
971 CORE_CLK_SRC_DPLL_X2)
972 done_rate = CORE_CLK_SRC_DPLL_X2;
974 done_rate = CORE_CLK_SRC_DPLL;
977 cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
979 /* dsp + iva1 div(2420), iva2.1(2430) */
980 cm_write_mod_reg(prcm->cm_clksel_dsp,
981 OMAP24XX_DSP_MOD, CM_CLKSEL);
983 cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
985 /* Major subsystem dividers */
986 tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
987 cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD, CM_CLKSEL1);
988 if (cpu_is_omap2430())
989 cm_write_mod_reg(prcm->cm_clksel_mdm,
990 OMAP2430_MDM_MOD, CM_CLKSEL);
992 /* x2 to enter init_mem */
993 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
995 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
998 omap2_init_memory_params(omap2_dll_force_needed());
999 omap2_reprogram_sdrc(done_rate, 0);
1001 local_irq_restore(flags);
1003 omap2_dpll_recalc(&dpll_ck);
1008 /*-------------------------------------------------------------------------
1009 * Omap2 clock reset and init functions
1010 *-------------------------------------------------------------------------*/
1012 #ifdef CONFIG_OMAP_RESET_CLOCKS
1013 static void __init omap2_clk_disable_unused(struct clk *clk)
1017 regval32 = cm_read_reg(clk->enable_reg);
1018 if ((regval32 & (1 << clk->enable_bit)) == 0)
1021 printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
1022 _omap2_clk_disable(clk);
1025 #define omap2_clk_disable_unused NULL
1028 static struct clk_functions omap2_clk_functions = {
1029 .clk_enable = omap2_clk_enable,
1030 .clk_disable = omap2_clk_disable,
1031 .clk_round_rate = omap2_clk_round_rate,
1032 .clk_set_rate = omap2_clk_set_rate,
1033 .clk_set_parent = omap2_clk_set_parent,
1034 .clk_disable_unused = omap2_clk_disable_unused,
1037 static void __init omap2_get_crystal_rate(struct clk *osc, struct clk *sys)
1039 u32 div, aplls, sclk = 13000000;
1041 aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
1042 aplls &= OMAP24XX_APLLS_CLKIN_MASK;
1043 aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
1045 if (aplls == APLLS_CLKIN_19_2MHZ)
1047 else if (aplls == APLLS_CLKIN_13MHZ)
1049 else if (aplls == APLLS_CLKIN_12MHZ)
1052 div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
1053 div &= OMAP_SYSCLKDIV_MASK;
1054 div >>= OMAP_SYSCLKDIV_SHIFT;
1056 osc->rate = sclk * div;
1061 * Set clocks for bypass mode for reboot to work.
1063 void omap2_clk_prepare_for_reboot(void)
1067 if (vclk == NULL || sclk == NULL)
1070 rate = clk_get_rate(sclk);
1071 clk_set_rate(vclk, rate);
1075 * Switch the MPU rate if specified on cmdline.
1076 * We cannot do this early until cmdline is parsed.
1078 static int __init omap2_clk_arch_init(void)
1083 if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1084 printk(KERN_ERR "Could not find matching MPU rate\n");
1086 recalculate_root_clocks();
1088 printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1089 "%ld.%01ld/%ld/%ld MHz\n",
1090 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1091 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1095 arch_initcall(omap2_clk_arch_init);
1097 int __init omap2_clk_init(void)
1099 struct prcm_config *prcm;
1103 if (cpu_is_omap242x())
1104 cpu_mask = RATE_IN_242X;
1105 else if (cpu_is_omap2430())
1106 cpu_mask = RATE_IN_243X;
1108 clk_init(&omap2_clk_functions);
1109 omap2_get_crystal_rate(&osc_ck, &sys_ck);
1111 for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1114 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1115 clk_register(*clkp);
1119 if ((*clkp)->flags & CLOCK_IN_OMAP243X && (cpu_is_omap2430() || cpu_is_omap34xx())) {
1120 clk_register(*clkp);
1125 /* Check the MPU rate set by bootloader */
1126 clkrate = omap2_get_dpll_rate(&dpll_ck);
1127 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1128 if (!(prcm->flags & cpu_mask))
1130 if (prcm->xtal_speed != sys_ck.rate)
1132 if (prcm->dpll_speed <= clkrate)
1135 curr_prcm_set = prcm;
1137 recalculate_root_clocks();
1139 printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1140 "%ld.%01ld/%ld/%ld MHz\n",
1141 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1142 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1145 * Only enable those clocks we will need, let the drivers
1146 * enable other clocks as necessary
1148 clk_enable(&sync_32k_ick);
1149 clk_enable(&omapctrl_ick);
1151 /* Force the APLLs always active. The clocks are idled
1152 * automatically by hardware. */
1153 clk_enable(&apll96_ck);
1154 clk_enable(&apll54_ck);
1156 if (cpu_is_omap2430())
1157 clk_enable(&sdrc_ick);
1159 /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
1160 vclk = clk_get(NULL, "virt_prcm_set");
1161 sclk = clk_get(NULL, "sys_ck");