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 /* Returns the DPLL rate */
117 static u32 omap2_get_dpll_rate(struct clk *clk)
120 u32 dpll_mult, dpll_div, dpll;
121 const struct dpll_data *dd;
124 /* REVISIT: What do we return on error? */
128 dpll = cm_read_reg(dd->mult_div1_reg);
129 dpll_mult = dpll & dd->mult_mask;
130 dpll_mult >>= mask_to_shift(dd->mult_mask);
131 dpll_div = dpll & dd->div1_mask;
132 dpll_div >>= mask_to_shift(dd->div1_mask);
134 dpll_clk = (long long)clk->parent->rate * dpll_mult;
135 do_div(dpll_clk, dpll_div + 1);
140 /* This actually returns the rate of core_ck, not dpll_ck. */
141 static u32 omap2_get_dpll_rate_24xx(struct clk *tclk)
146 dpll_clk = omap2_get_dpll_rate(tclk);
148 amult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
149 amult &= OMAP24XX_CORE_CLK_SRC_MASK;
156 * Used for clocks that have the same value as the parent clock,
157 * divided by some factor
159 static void omap2_fixed_divisor_recalc(struct clk *clk)
161 WARN_ON(!clk->fixed_div);
163 clk->rate = clk->parent->rate / clk->fixed_div;
165 if (clk->flags & RATE_PROPAGATES)
169 static int omap2_enable_osc_ck(struct clk *clk)
173 pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
175 prm_write_reg(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
176 OMAP24XX_PRCM_CLKSRC_CTRL);
181 static void omap2_disable_osc_ck(struct clk *clk)
185 pcc = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
187 prm_write_reg(pcc | OMAP_AUTOEXTCLKMODE_MASK,
188 OMAP24XX_PRCM_CLKSRC_CTRL);
192 * omap2_wait_clock_ready - wait for PLL to lock
194 * Returns 1 if the PLL locked, 0 if it failed to lock.
196 static int omap2_wait_clock_ready(void __iomem *reg, u32 cval, const char *name)
201 while (!(cm_read_reg(reg) & cval)) {
204 if (i == MAX_PLL_LOCK_WAIT) {
205 printk(KERN_ERR "Clock %s didn't lock in %d tries\n",
206 name, MAX_PLL_LOCK_WAIT);
212 pr_debug("Clock %s stable after %d loops\n", name, i);
214 return (i < MAX_PLL_LOCK_WAIT) ? 1 : 0;
218 /* Enable an APLL if off */
219 static int omap2_clk_fixed_enable(struct clk *clk)
223 apll_mask = EN_APLL_LOCKED << clk->enable_bit;
225 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
227 if ((cval & apll_mask) == apll_mask)
228 return 0; /* apll already enabled */
232 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
234 if (clk == &apll96_ck)
235 cval = OMAP24XX_ST_96M_APLL;
236 else if (clk == &apll54_ck)
237 cval = OMAP24XX_ST_54M_CLK;
239 omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
243 * REVISIT: Should we return an error code if omap2_wait_clock_ready()
249 static void omap2_clk_wait_ready(struct clk *clk)
251 void __iomem *reg, *other_reg, *st_reg;
254 reg = clk->enable_reg;
255 if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_FCLKEN1) ||
256 reg == OMAP_CM_REGADDR(CORE_MOD, OMAP24XX_CM_FCLKEN2))
257 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x10); /* CM_ICLKEN* */
258 else if (reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN1) ||
259 reg == OMAP_CM_REGADDR(CORE_MOD, CM_ICLKEN2))
260 other_reg = (void __iomem *)(((u32)reg & ~0xf0) | 0x00); /* CM_FCLKEN* */
264 /* No check for DSS or cam clocks */
265 if (((u32)reg & 0x0f) == 0) { /* CM_{F,I}CLKEN1 */
266 if (clk->enable_bit == OMAP24XX_EN_DSS2_SHIFT ||
267 clk->enable_bit == OMAP24XX_EN_DSS1_SHIFT ||
268 clk->enable_bit == OMAP24XX_EN_CAM_SHIFT)
272 /* Check if both functional and interface clocks
274 bit = 1 << clk->enable_bit;
275 if (!(cm_read_reg(other_reg) & bit))
277 st_reg = (void __iomem *)(((u32)other_reg & ~0xf0) | 0x20); /* CM_IDLEST* */
279 omap2_wait_clock_ready(st_reg, bit, clk->name);
282 /* Enables clock without considering parent dependencies or use count
283 * REVISIT: Maybe change this to use clk->enable like on omap1?
285 static int _omap2_clk_enable(struct clk * clk)
289 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
293 return clk->enable(clk);
295 if (unlikely(clk->enable_reg == 0)) {
296 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
301 regval32 = cm_read_reg(clk->enable_reg);
302 regval32 |= (1 << clk->enable_bit);
303 cm_write_reg(regval32, clk->enable_reg);
306 omap2_clk_wait_ready(clk);
312 static void omap2_clk_fixed_disable(struct clk *clk)
316 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
317 cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
318 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
321 /* Disables clock without considering parent dependencies or use count */
322 static void _omap2_clk_disable(struct clk *clk)
326 if (clk->flags & (ALWAYS_ENABLED | PARENT_CONTROLS_CLOCK))
334 if (clk->enable_reg == 0) {
336 * 'Independent' here refers to a clock which is not
337 * controlled by its parent.
339 printk(KERN_ERR "clock: clk_disable called on independent "
340 "clock %s which has no enable_reg\n", clk->name);
344 regval32 = cm_read_reg(clk->enable_reg);
345 regval32 &= ~(1 << clk->enable_bit);
346 cm_write_reg(regval32, clk->enable_reg);
350 static int omap2_clk_enable(struct clk *clk)
354 if (clk->usecount++ == 0) {
355 if (likely((u32)clk->parent))
356 ret = omap2_clk_enable(clk->parent);
358 if (unlikely(ret != 0)) {
363 ret = _omap2_clk_enable(clk);
365 if (unlikely(ret != 0) && clk->parent) {
366 omap2_clk_disable(clk->parent);
374 static void omap2_clk_disable(struct clk *clk)
376 if (clk->usecount > 0 && !(--clk->usecount)) {
377 _omap2_clk_disable(clk);
378 if (likely((u32)clk->parent))
379 omap2_clk_disable(clk->parent);
384 * Uses the current prcm set to tell if a rate is valid.
385 * You can go slower, but not faster within a given rate set.
387 static u32 omap2_dpll_round_rate(unsigned long target_rate)
389 u32 high, low, core_clk_src;
391 core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
392 core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
394 if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */
395 high = curr_prcm_set->dpll_speed * 2;
396 low = curr_prcm_set->dpll_speed;
397 } else { /* DPLL clockout x 2 */
398 high = curr_prcm_set->dpll_speed;
399 low = curr_prcm_set->dpll_speed / 2;
402 #ifdef DOWN_VARIABLE_DPLL
403 if (target_rate > high)
408 if (target_rate > low)
416 static void omap2_dpll_recalc(struct clk *clk)
418 clk->rate = omap2_get_dpll_rate_24xx(clk);
424 * Used for clocks that are part of CLKSEL_xyz governed clocks.
425 * REVISIT: Maybe change to use clk->enable() functions like on omap1?
427 static void omap2_clksel_recalc(struct clk * clk)
431 pr_debug("clock: recalc'ing clksel clk %s\n", clk->name);
433 div = omap2_clksel_get_divisor(clk);
437 if (unlikely(clk->rate == clk->parent->rate / div))
439 clk->rate = clk->parent->rate / div;
441 pr_debug("clock: new clock rate is %ld (div %d)\n", clk->rate, div);
443 if (unlikely(clk->flags & RATE_PROPAGATES))
448 * omap2_get_clksel_by_parent - return clksel struct for a given clk & parent
449 * @clk: OMAP struct clk ptr to inspect
450 * @src_clk: OMAP struct clk ptr of the parent clk to search for
452 * Scan the struct clksel array associated with the clock to find
453 * the element associated with the supplied parent clock address.
454 * Returns a pointer to the struct clksel on success or NULL on error.
456 const static struct clksel *omap2_get_clksel_by_parent(struct clk *clk,
459 const struct clksel *clks;
464 for (clks = clk->clksel; clks->parent; clks++) {
465 if (clks->parent == src_clk)
466 break; /* Found the requested parent */
470 printk(KERN_ERR "clock: Could not find parent clock %s in "
471 "clksel array of clock %s\n", src_clk->name,
480 * omap2_clksel_round_rate_div - find divisor for the given clock and rate
481 * @clk: OMAP struct clk to use
482 * @target_rate: desired clock rate
483 * @new_div: ptr to where we should store the divisor
485 * Finds 'best' divider value in an array based on the source and target
486 * rates. The divider array must be sorted with smallest divider first.
487 * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
488 * they are only settable as part of virtual_prcm set.
490 * Returns the rounded clock rate or returns 0xffffffff on error.
492 static u32 omap2_clksel_round_rate_div(struct clk *clk,
493 unsigned long target_rate,
496 unsigned long test_rate;
497 const struct clksel *clks;
498 const struct clksel_rate *clkr;
501 printk(KERN_INFO "clock: clksel_round_rate_div: %s target_rate %ld\n",
502 clk->name, target_rate);
506 clks = omap2_get_clksel_by_parent(clk, clk->parent);
510 for (clkr = clks->rates; clkr->div; clkr++) {
511 if (!(clkr->flags & cpu_mask))
515 if (clkr->div <= last_div)
516 printk(KERN_ERR "clock: clksel_rate table not sorted "
517 "for clock %s", clk->name);
519 last_div = clkr->div;
521 test_rate = clk->parent->rate / clkr->div;
523 if (test_rate <= target_rate)
524 break; /* found it */
528 printk(KERN_ERR "clock: Could not find divisor for target "
529 "rate %ld for clock %s parent %s\n", target_rate,
530 clk->name, clk->parent->name);
534 *new_div = clkr->div;
536 printk(KERN_INFO "clock: new_div = %d, new_rate = %ld\n", *new_div,
537 (clk->parent->rate / clkr->div));
539 return (clk->parent->rate / clkr->div);
543 * omap2_clksel_round_rate - find rounded rate for the given clock and rate
544 * @clk: OMAP struct clk to use
545 * @target_rate: desired clock rate
547 * Compatibility wrapper for OMAP clock framework
548 * Finds best target rate based on the source clock and possible dividers.
549 * rates. The divider array must be sorted with smallest divider first.
550 * Note that this will not work for clocks which are part of CONFIG_PARTICIPANT,
551 * they are only settable as part of virtual_prcm set.
553 * Returns the rounded clock rate or returns 0xffffffff on error.
555 static long omap2_clksel_round_rate(struct clk *clk, unsigned long target_rate)
559 return omap2_clksel_round_rate_div(clk, target_rate, &new_div);
563 /* Given a clock and a rate apply a clock specific rounding function */
564 static long omap2_clk_round_rate(struct clk *clk, unsigned long rate)
566 if (clk->round_rate != 0)
567 return clk->round_rate(clk, rate);
569 if (clk->flags & RATE_FIXED)
570 printk(KERN_ERR "clock: generic omap2_clk_round_rate called "
571 "on fixed-rate clock %s\n", clk->name);
576 static int omap2_reprogram_dpll(struct clk * clk, unsigned long rate)
578 u32 flags, cur_rate, low, mult, div, valid_rate, done_rate;
580 struct prcm_config tmpset;
581 const struct dpll_data *dd;
584 local_irq_save(flags);
585 cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
586 mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
587 mult &= OMAP24XX_CORE_CLK_SRC_MASK;
589 if ((rate == (cur_rate / 2)) && (mult == 2)) {
590 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
591 } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
592 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
593 } else if (rate != cur_rate) {
594 valid_rate = omap2_dpll_round_rate(rate);
595 if (valid_rate != rate)
599 low = curr_prcm_set->dpll_speed;
601 low = curr_prcm_set->dpll_speed / 2;
607 tmpset.cm_clksel1_pll = cm_read_reg(dd->mult_div1_reg);
608 tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
610 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
611 tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
612 tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
614 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
615 mult = ((rate / 2) / 1000000);
616 done_rate = CORE_CLK_SRC_DPLL_X2;
618 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
619 mult = (rate / 1000000);
620 done_rate = CORE_CLK_SRC_DPLL;
622 tmpset.cm_clksel1_pll |= (div << mask_to_shift(dd->mult_mask));
623 tmpset.cm_clksel1_pll |= (mult << mask_to_shift(dd->div1_mask));
626 tmpset.base_sdrc_rfr = V24XX_SDRC_RFR_CTRL_BYPASS;
628 if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
631 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1); /* For init_mem */
633 /* Force dll lock mode */
634 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
637 /* Errata: ret dll entry state */
638 omap2_init_memory_params(omap2_dll_force_needed());
639 omap2_reprogram_sdrc(done_rate, 0);
641 omap2_dpll_recalc(&dpll_ck);
645 local_irq_restore(flags);
650 * omap2_table_mpu_recalc - just return the MPU speed
651 * @clk: virt_prcm_set struct clk
653 * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
655 static void omap2_table_mpu_recalc(struct clk *clk)
657 clk->rate = curr_prcm_set->mpu_speed;
661 * Look for a rate equal or less than the target rate given a configuration set.
663 * What's not entirely clear is "which" field represents the key field.
664 * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
665 * just uses the ARM rates.
667 static long omap2_round_to_table_rate(struct clk * clk, unsigned long rate)
669 struct prcm_config * ptr;
672 if (clk != &virt_prcm_set)
675 highest_rate = -EINVAL;
677 for (ptr = rate_table; ptr->mpu_speed; ptr++) {
678 if (!(ptr->flags & cpu_mask))
680 if (ptr->xtal_speed != sys_ck.rate)
683 highest_rate = ptr->mpu_speed;
685 /* Can check only after xtal frequency check */
686 if (ptr->mpu_speed <= rate)
693 * omap2_clksel_to_divisor() - turn clksel field value into integer divider
694 * @clk: OMAP struct clk to use
695 * @field_val: register field value to find
697 * Given a struct clk of a rate-selectable clksel clock, and a register field
698 * value to search for, find the corresponding clock divisor. The register
699 * field value should be pre-masked and shifted down so the LSB is at bit 0
700 * before calling. Returns 0 on error
702 static u32 omap2_clksel_to_divisor(struct clk *clk, u32 field_val)
704 const struct clksel *clks;
705 const struct clksel_rate *clkr;
707 clks = omap2_get_clksel_by_parent(clk, clk->parent);
711 for (clkr = clks->rates; clkr->div; clkr++) {
712 if ((clkr->flags & cpu_mask) && (clkr->val == field_val))
717 printk(KERN_ERR "clock: Could not find fieldval %d for "
718 "clock %s parent %s\n", field_val, clk->name,
727 * omap2_divisor_to_clksel() - turn clksel integer divisor into a field value
728 * @clk: OMAP struct clk to use
729 * @div: integer divisor to search for
731 * Given a struct clk of a rate-selectable clksel clock, and a clock divisor,
732 * find the corresponding register field value. The return register value is
733 * the value before left-shifting. Returns 0xffffffff on error
735 static u32 omap2_divisor_to_clksel(struct clk *clk, u32 div)
737 const struct clksel *clks;
738 const struct clksel_rate *clkr;
740 /* should never happen */
743 clks = omap2_get_clksel_by_parent(clk, clk->parent);
747 for (clkr = clks->rates; clkr->div; clkr++) {
748 if ((clkr->flags & cpu_mask) && (clkr->div == div))
753 printk(KERN_ERR "clock: Could not find divisor %d for "
754 "clock %s parent %s\n", div, clk->name,
763 * omap2_get_clksel - find clksel register addr & field mask for a clk
764 * @clk: struct clk to use
765 * @field_mask: ptr to u32 to store the register field mask
767 * Returns the address of the clksel register upon success or NULL on error.
769 static void __iomem *omap2_get_clksel(struct clk *clk, u32 *field_mask)
771 if (unlikely((clk->clksel_reg == 0) || (clk->clksel_mask == 0)))
774 *field_mask = clk->clksel_mask;
776 return clk->clksel_reg;
780 * omap2_clksel_get_divisor - get current divider applied to parent clock.
781 * @clk: OMAP struct clk to use.
783 * Returns the integer divisor upon success or 0 on error.
785 static u32 omap2_clksel_get_divisor(struct clk *clk)
787 u32 field_mask, field_val;
788 void __iomem *div_addr;
790 div_addr = omap2_get_clksel(clk, &field_mask);
794 field_val = cm_read_reg(div_addr) & field_mask;
795 field_val >>= mask_to_shift(field_mask);
797 return omap2_clksel_to_divisor(clk, field_val);
800 static int omap2_clksel_set_rate(struct clk *clk, unsigned long rate)
802 u32 field_mask, field_val, reg_val, validrate, new_div = 0;
803 void __iomem *div_addr;
805 validrate = omap2_clksel_round_rate_div(clk, rate, &new_div);
806 if (validrate != rate)
809 div_addr = omap2_get_clksel(clk, &field_mask);
813 field_val = omap2_divisor_to_clksel(clk, new_div);
817 reg_val = cm_read_reg(div_addr);
818 reg_val &= ~field_mask;
819 reg_val |= (field_val << mask_to_shift(field_mask));
820 cm_write_reg(reg_val, div_addr);
823 clk->rate = clk->parent->rate / new_div;
825 if (clk->flags & DELAYED_APP) {
826 prm_write_reg(OMAP24XX_VALID_CONFIG, OMAP24XX_PRCM_CLKCFG_CTRL);
834 /* Set the clock rate for a clock source */
835 static int omap2_clk_set_rate(struct clk *clk, unsigned long rate)
839 pr_debug("clock: set_rate for clock %s to rate %ld\n", clk->name, rate);
841 /* CONFIG_PARTICIPANT clocks are changed only in sets via the
842 rate table mechanism, driven by mpu_speed */
843 if (clk->flags & CONFIG_PARTICIPANT)
846 /* dpll_ck, core_ck, virt_prcm_set; plus all clksel clocks */
847 if (clk->set_rate != 0)
848 ret = clk->set_rate(clk, rate);
850 if (unlikely(ret == 0 && (clk->flags & RATE_PROPAGATES)))
857 * Converts encoded control register address into a full address
858 * On error, *src_addr will be returned as 0.
860 static u32 omap2_clksel_get_src_field(void __iomem **src_addr,
861 struct clk *src_clk, u32 *field_mask,
862 struct clk *clk, u32 *parent_div)
864 const struct clksel *clks;
865 const struct clksel_rate *clkr;
870 clks = omap2_get_clksel_by_parent(clk, src_clk);
874 for (clkr = clks->rates; clkr->div; clkr++) {
875 if (clkr->flags & (cpu_mask | DEFAULT_RATE))
876 break; /* Found the default rate for this platform */
880 printk(KERN_ERR "clock: Could not find default rate for "
881 "clock %s parent %s\n", clk->name,
882 src_clk->parent->name);
886 /* Should never happen. Add a clksel mask to the struct clk. */
887 WARN_ON(clk->clksel_mask == 0);
889 *field_mask = clk->clksel_mask;
890 *src_addr = clk->clksel_reg;
891 *parent_div = clkr->div;
896 static int omap2_clk_set_parent(struct clk *clk, struct clk *new_parent)
898 void __iomem *src_addr;
899 u32 field_val, field_mask, reg_val, parent_div;
901 if (unlikely(clk->flags & CONFIG_PARTICIPANT))
907 field_val = omap2_clksel_get_src_field(&src_addr, new_parent,
908 &field_mask, clk, &parent_div);
912 if (clk->usecount > 0)
913 _omap2_clk_disable(clk);
915 /* Set new source value (previous dividers if any in effect) */
916 reg_val = __raw_readl(src_addr) & ~field_mask;
917 reg_val |= (field_val << mask_to_shift(field_mask));
918 __raw_writel(reg_val, src_addr);
921 if (clk->flags & DELAYED_APP) {
922 prm_write_reg(OMAP24XX_VALID_CONFIG,
923 OMAP24XX_PRCM_CLKCFG_CTRL);
927 if (clk->usecount > 0)
928 _omap2_clk_enable(clk);
930 clk->parent = new_parent;
932 /* CLKSEL clocks follow their parents' rates, divided by a divisor */
933 clk->rate = new_parent->rate;
936 clk->rate /= parent_div;
938 pr_debug("clock: set parent of %s to %s (new rate %ld)\n",
939 clk->name, clk->parent->name, clk->rate);
941 if (unlikely(clk->flags & RATE_PROPAGATES))
947 /* Sets basic clocks based on the specified rate */
948 static int omap2_select_table_rate(struct clk * clk, unsigned long rate)
950 u32 flags, cur_rate, done_rate, bypass = 0, tmp;
951 struct prcm_config *prcm;
952 unsigned long found_speed = 0;
954 if (clk != &virt_prcm_set)
957 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
958 if (!(prcm->flags & cpu_mask))
961 if (prcm->xtal_speed != sys_ck.rate)
964 if (prcm->mpu_speed <= rate) {
965 found_speed = prcm->mpu_speed;
971 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
976 curr_prcm_set = prcm;
977 cur_rate = omap2_get_dpll_rate_24xx(&dpll_ck);
979 if (prcm->dpll_speed == cur_rate / 2) {
980 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL, 1);
981 } else if (prcm->dpll_speed == cur_rate * 2) {
982 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
983 } else if (prcm->dpll_speed != cur_rate) {
984 local_irq_save(flags);
986 if (prcm->dpll_speed == prcm->xtal_speed)
989 if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
990 CORE_CLK_SRC_DPLL_X2)
991 done_rate = CORE_CLK_SRC_DPLL_X2;
993 done_rate = CORE_CLK_SRC_DPLL;
996 cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
998 /* dsp + iva1 div(2420), iva2.1(2430) */
999 cm_write_mod_reg(prcm->cm_clksel_dsp,
1000 OMAP24XX_DSP_MOD, CM_CLKSEL);
1002 cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
1004 /* Major subsystem dividers */
1005 tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
1006 cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD, CM_CLKSEL1);
1007 if (cpu_is_omap2430())
1008 cm_write_mod_reg(prcm->cm_clksel_mdm,
1009 OMAP2430_MDM_MOD, CM_CLKSEL);
1011 /* x2 to enter init_mem */
1012 omap2_reprogram_sdrc(CORE_CLK_SRC_DPLL_X2, 1);
1014 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
1017 omap2_init_memory_params(omap2_dll_force_needed());
1018 omap2_reprogram_sdrc(done_rate, 0);
1020 local_irq_restore(flags);
1022 omap2_dpll_recalc(&dpll_ck);
1027 /*-------------------------------------------------------------------------
1028 * Omap2 clock reset and init functions
1029 *-------------------------------------------------------------------------*/
1031 #ifdef CONFIG_OMAP_RESET_CLOCKS
1032 static void __init omap2_clk_disable_unused(struct clk *clk)
1036 regval32 = cm_read_reg(clk->enable_reg);
1037 if ((regval32 & (1 << clk->enable_bit)) == 0)
1040 printk(KERN_INFO "Disabling unused clock \"%s\"\n", clk->name);
1041 _omap2_clk_disable(clk);
1044 #define omap2_clk_disable_unused NULL
1047 static struct clk_functions omap2_clk_functions = {
1048 .clk_enable = omap2_clk_enable,
1049 .clk_disable = omap2_clk_disable,
1050 .clk_round_rate = omap2_clk_round_rate,
1051 .clk_set_rate = omap2_clk_set_rate,
1052 .clk_set_parent = omap2_clk_set_parent,
1053 .clk_disable_unused = omap2_clk_disable_unused,
1056 static u32 omap2_get_apll_clkin(void)
1058 u32 aplls, sclk = 0;
1060 aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
1061 aplls &= OMAP24XX_APLLS_CLKIN_MASK;
1062 aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
1064 if (aplls == APLLS_CLKIN_19_2MHZ)
1066 else if (aplls == APLLS_CLKIN_13MHZ)
1068 else if (aplls == APLLS_CLKIN_12MHZ)
1074 static u32 omap2_get_sysclkdiv(void)
1078 div = prm_read_reg(OMAP24XX_PRCM_CLKSRC_CTRL);
1079 div &= OMAP_SYSCLKDIV_MASK;
1080 div >>= OMAP_SYSCLKDIV_SHIFT;
1085 static void omap2_osc_clk_recalc(struct clk *clk)
1087 clk->rate = omap2_get_apll_clkin() * omap2_get_sysclkdiv();
1088 propagate_rate(clk);
1091 static void omap2_sys_clk_recalc(struct clk *clk)
1093 clk->rate = clk->parent->rate / omap2_get_sysclkdiv();
1094 propagate_rate(clk);
1098 * Set clocks for bypass mode for reboot to work.
1100 void omap2_clk_prepare_for_reboot(void)
1104 if (vclk == NULL || sclk == NULL)
1107 rate = clk_get_rate(sclk);
1108 clk_set_rate(vclk, rate);
1112 * Switch the MPU rate if specified on cmdline.
1113 * We cannot do this early until cmdline is parsed.
1115 static int __init omap2_clk_arch_init(void)
1120 if (omap2_select_table_rate(&virt_prcm_set, mpurate))
1121 printk(KERN_ERR "Could not find matching MPU rate\n");
1123 recalculate_root_clocks();
1125 printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
1126 "%ld.%01ld/%ld/%ld MHz\n",
1127 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1128 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1132 arch_initcall(omap2_clk_arch_init);
1134 int __init omap2_clk_init(void)
1136 struct prcm_config *prcm;
1140 if (cpu_is_omap242x())
1141 cpu_mask = RATE_IN_242X;
1142 else if (cpu_is_omap2430())
1143 cpu_mask = RATE_IN_243X;
1145 clk_init(&omap2_clk_functions);
1147 omap2_osc_clk_recalc(&osc_ck);
1149 for (clkp = onchip_clks; clkp < onchip_clks + ARRAY_SIZE(onchip_clks);
1152 if ((*clkp)->flags & CLOCK_IN_OMAP242X && cpu_is_omap2420()) {
1153 clk_register(*clkp);
1157 if ((*clkp)->flags & CLOCK_IN_OMAP243X && (cpu_is_omap2430() || cpu_is_omap34xx())) {
1158 clk_register(*clkp);
1163 /* Check the MPU rate set by bootloader */
1164 clkrate = omap2_get_dpll_rate_24xx(&dpll_ck);
1165 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
1166 if (!(prcm->flags & cpu_mask))
1168 if (prcm->xtal_speed != sys_ck.rate)
1170 if (prcm->dpll_speed <= clkrate)
1173 curr_prcm_set = prcm;
1175 recalculate_root_clocks();
1177 printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
1178 "%ld.%01ld/%ld/%ld MHz\n",
1179 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
1180 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
1183 * Only enable those clocks we will need, let the drivers
1184 * enable other clocks as necessary
1186 clk_enable(&sync_32k_ick);
1187 clk_enable(&omapctrl_ick);
1189 /* Force the APLLs always active. The clocks are idled
1190 * automatically by hardware. */
1191 clk_enable(&apll96_ck);
1192 clk_enable(&apll54_ck);
1194 if (cpu_is_omap2430())
1195 clk_enable(&sdrc_ick);
1197 /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
1198 vclk = clk_get(NULL, "virt_prcm_set");
1199 sclk = clk_get(NULL, "sys_ck");