2 * linux/arch/arm/mach-omap1/clock.c
4 * Copyright (C) 2004 - 2005 Nokia corporation
5 * Written by Tuukka Tikkanen <tuukka.tikkanen@elektrobit.com>
7 * Modified to use omap shared clock framework by
8 * Tony Lindgren <tony@atomide.com>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/list.h>
17 #include <linux/errno.h>
18 #include <linux/err.h>
19 #include <linux/clk.h>
22 #include <asm/mach-types.h>
26 #include <mach/clock.h>
27 #include <mach/sram.h>
31 __u32 arm_idlect1_mask;
33 /*-------------------------------------------------------------------------
34 * Omap1 specific clock functions
35 *-------------------------------------------------------------------------*/
37 static void omap1_watchdog_recalc(struct clk *clk, unsigned long parent_rate,
40 unsigned long new_rate;
42 new_rate = parent_rate / 14;
44 if (rate_storage == CURRENT_RATE)
46 else if (rate_storage == TEMP_RATE)
47 clk->temp_rate = new_rate;
50 static void omap1_uart_recalc(struct clk *clk, unsigned long parent_rate,
53 unsigned long new_rate;
54 unsigned int val = __raw_readl(clk->enable_reg);
56 if (val & clk->enable_bit)
61 if (rate_storage == CURRENT_RATE)
63 else if (rate_storage == TEMP_RATE)
64 clk->temp_rate = new_rate;
67 static void omap1_sossi_recalc(struct clk *clk, unsigned long parent_rate,
70 unsigned long new_rate;
71 u32 div = omap_readl(MOD_CONF_CTRL_1);
73 div = (div >> 17) & 0x7;
75 new_rate = clk->parent->rate / div;
77 if (rate_storage == CURRENT_RATE)
79 else if (rate_storage == TEMP_RATE)
80 clk->temp_rate = new_rate;
83 static int omap1_clk_enable_dsp_domain(struct clk *clk)
87 retval = omap1_clk_enable(&api_ck.clk);
89 retval = omap1_clk_enable_generic(clk);
90 omap1_clk_disable(&api_ck.clk);
96 static void omap1_clk_disable_dsp_domain(struct clk *clk)
98 if (omap1_clk_enable(&api_ck.clk) == 0) {
99 omap1_clk_disable_generic(clk);
100 omap1_clk_disable(&api_ck.clk);
104 static int omap1_clk_enable_uart_functional(struct clk *clk)
107 struct uart_clk *uclk;
109 ret = omap1_clk_enable_generic(clk);
111 /* Set smart idle acknowledgement mode */
112 uclk = (struct uart_clk *)clk;
113 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
120 static void omap1_clk_disable_uart_functional(struct clk *clk)
122 struct uart_clk *uclk;
124 /* Set force idle acknowledgement mode */
125 uclk = (struct uart_clk *)clk;
126 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
128 omap1_clk_disable_generic(clk);
131 static void omap1_clk_allow_idle(struct clk *clk)
133 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
135 if (!(clk->flags & CLOCK_IDLE_CONTROL))
138 if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
139 arm_idlect1_mask |= 1 << iclk->idlect_shift;
142 static void omap1_clk_deny_idle(struct clk *clk)
144 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
146 if (!(clk->flags & CLOCK_IDLE_CONTROL))
149 if (iclk->no_idle_count++ == 0)
150 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
153 static __u16 verify_ckctl_value(__u16 newval)
155 /* This function checks for following limitations set
156 * by the hardware (all conditions must be true):
157 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
162 * In addition following rules are enforced:
166 * However, maximum frequencies are not checked for!
175 per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
176 lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
177 arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
178 dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
179 tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
180 dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
182 if (dspmmu_exp < dsp_exp)
183 dspmmu_exp = dsp_exp;
184 if (dspmmu_exp > dsp_exp+1)
185 dspmmu_exp = dsp_exp+1;
186 if (tc_exp < arm_exp)
188 if (tc_exp < dspmmu_exp)
190 if (tc_exp > lcd_exp)
192 if (tc_exp > per_exp)
196 newval |= per_exp << CKCTL_PERDIV_OFFSET;
197 newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
198 newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
199 newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
200 newval |= tc_exp << CKCTL_TCDIV_OFFSET;
201 newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
206 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
208 /* Note: If target frequency is too low, this function will return 4,
209 * which is invalid value. Caller must check for this value and act
212 * Note: This function does not check for following limitations set
213 * by the hardware (all conditions must be true):
214 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
219 unsigned long realrate;
223 if (unlikely(!(clk->flags & RATE_CKCTL)))
226 parent = clk->parent;
227 if (unlikely(parent == NULL))
230 realrate = parent->rate;
231 for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
232 if (realrate <= rate)
241 static void omap1_ckctl_recalc(struct clk *clk, unsigned long parent_rate,
245 unsigned long new_rate;
247 /* Calculate divisor encoded as 2-bit exponent */
248 dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
250 new_rate = parent_rate / dsor;
252 if (unlikely(clk->rate == new_rate))
253 return; /* No change, quick exit */
255 if (rate_storage == CURRENT_RATE)
256 clk->rate = new_rate;
257 else if (rate_storage == TEMP_RATE)
258 clk->temp_rate = new_rate;
261 static void omap1_ckctl_recalc_dsp_domain(struct clk *clk,
262 unsigned long parent_rate,
266 unsigned long new_rate;
268 /* Calculate divisor encoded as 2-bit exponent
270 * The clock control bits are in DSP domain,
271 * so api_ck is needed for access.
272 * Note that DSP_CKCTL virt addr = phys addr, so
273 * we must use __raw_readw() instead of omap_readw().
275 omap1_clk_enable(&api_ck.clk);
276 dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
277 omap1_clk_disable(&api_ck.clk);
279 new_rate = parent_rate / dsor;
281 if (unlikely(clk->rate == new_rate))
282 return; /* No change, quick exit */
284 if (rate_storage == CURRENT_RATE)
285 clk->rate = new_rate;
286 else if (rate_storage == TEMP_RATE)
287 clk->temp_rate = new_rate;
290 /* MPU virtual clock functions */
291 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
293 /* Find the highest supported frequency <= rate and switch to it */
294 struct mpu_rate * ptr;
296 if (clk != &virtual_ck_mpu)
299 for (ptr = rate_table; ptr->rate; ptr++) {
300 if (ptr->xtal != ck_ref.rate)
303 /* DPLL1 cannot be reprogrammed without risking system crash */
304 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
307 /* Can check only after xtal frequency check */
308 if (ptr->rate <= rate)
316 * In most cases we should not need to reprogram DPLL.
317 * Reprogramming the DPLL is tricky, it must be done from SRAM.
318 * (on 730, bit 13 must always be 1)
320 if (cpu_is_omap730())
321 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
323 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
325 ck_dpll1.rate = ptr->pll_rate;
326 propagate_rate(&ck_dpll1, CURRENT_RATE);
330 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
336 if (clk->flags & RATE_CKCTL) {
337 dsor_exp = calc_dsor_exp(clk, rate);
343 regval = __raw_readw(DSP_CKCTL);
344 regval &= ~(3 << clk->rate_offset);
345 regval |= dsor_exp << clk->rate_offset;
346 __raw_writew(regval, DSP_CKCTL);
347 clk->rate = clk->parent->rate / (1 << dsor_exp);
354 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
356 /* Find the highest supported frequency <= rate */
357 struct mpu_rate * ptr;
360 if (clk != &virtual_ck_mpu)
363 highest_rate = -EINVAL;
365 for (ptr = rate_table; ptr->rate; ptr++) {
366 if (ptr->xtal != ck_ref.rate)
369 highest_rate = ptr->rate;
371 /* Can check only after xtal frequency check */
372 if (ptr->rate <= rate)
379 static unsigned calc_ext_dsor(unsigned long rate)
383 /* MCLK and BCLK divisor selection is not linear:
384 * freq = 96MHz / dsor
386 * RATIO_SEL range: dsor <-> RATIO_SEL
387 * 0..6: (RATIO_SEL+2) <-> (dsor-2)
388 * 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
389 * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
392 for (dsor = 2; dsor < 96; ++dsor) {
393 if ((dsor & 1) && dsor > 8)
395 if (rate >= 96000000 / dsor)
401 /* Only needed on 1510 */
402 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
406 val = __raw_readl(clk->enable_reg);
407 if (rate == 12000000)
408 val &= ~(1 << clk->enable_bit);
409 else if (rate == 48000000)
410 val |= (1 << clk->enable_bit);
413 __raw_writel(val, clk->enable_reg);
419 /* External clock (MCLK & BCLK) functions */
420 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
425 dsor = calc_ext_dsor(rate);
426 clk->rate = 96000000 / dsor;
428 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
430 ratio_bits = (dsor - 2) << 2;
432 ratio_bits |= __raw_readw(clk->enable_reg) & ~0xfd;
433 __raw_writew(ratio_bits, clk->enable_reg);
438 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
442 unsigned long p_rate;
444 p_rate = clk->parent->rate;
445 /* Round towards slower frequency */
446 div = (p_rate + rate - 1) / rate;
448 if (div < 0 || div > 7)
451 l = omap_readl(MOD_CONF_CTRL_1);
454 omap_writel(l, MOD_CONF_CTRL_1);
456 clk->rate = p_rate / (div + 1);
461 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
463 return 96000000 / calc_ext_dsor(rate);
466 static void omap1_init_ext_clk(struct clk * clk)
471 /* Determine current rate and ensure clock is based on 96MHz APLL */
472 ratio_bits = __raw_readw(clk->enable_reg) & ~1;
473 __raw_writew(ratio_bits, clk->enable_reg);
475 ratio_bits = (ratio_bits & 0xfc) >> 2;
477 dsor = (ratio_bits - 6) * 2 + 8;
479 dsor = ratio_bits + 2;
481 clk-> rate = 96000000 / dsor;
484 static int omap1_clk_enable(struct clk *clk)
487 if (clk->usecount++ == 0) {
488 if (likely(clk->parent)) {
489 ret = omap1_clk_enable(clk->parent);
491 if (unlikely(ret != 0)) {
496 if (clk->flags & CLOCK_NO_IDLE_PARENT)
497 omap1_clk_deny_idle(clk->parent);
500 ret = clk->enable(clk);
502 if (unlikely(ret != 0) && clk->parent) {
503 omap1_clk_disable(clk->parent);
511 static void omap1_clk_disable(struct clk *clk)
513 if (clk->usecount > 0 && !(--clk->usecount)) {
515 if (likely(clk->parent)) {
516 omap1_clk_disable(clk->parent);
517 if (clk->flags & CLOCK_NO_IDLE_PARENT)
518 omap1_clk_allow_idle(clk->parent);
523 static int omap1_clk_enable_generic(struct clk *clk)
528 if (clk->flags & ALWAYS_ENABLED)
531 if (unlikely(clk->enable_reg == NULL)) {
532 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
537 if (clk->flags & ENABLE_REG_32BIT) {
538 regval32 = __raw_readl(clk->enable_reg);
539 regval32 |= (1 << clk->enable_bit);
540 __raw_writel(regval32, clk->enable_reg);
542 regval16 = __raw_readw(clk->enable_reg);
543 regval16 |= (1 << clk->enable_bit);
544 __raw_writew(regval16, clk->enable_reg);
550 static void omap1_clk_disable_generic(struct clk *clk)
555 if (clk->enable_reg == NULL)
558 if (clk->flags & ENABLE_REG_32BIT) {
559 regval32 = __raw_readl(clk->enable_reg);
560 regval32 &= ~(1 << clk->enable_bit);
561 __raw_writel(regval32, clk->enable_reg);
563 regval16 = __raw_readw(clk->enable_reg);
564 regval16 &= ~(1 << clk->enable_bit);
565 __raw_writew(regval16, clk->enable_reg);
569 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
573 if (clk->flags & RATE_FIXED)
576 if (clk->flags & RATE_CKCTL) {
577 dsor_exp = calc_dsor_exp(clk, rate);
582 return clk->parent->rate / (1 << dsor_exp);
585 if (clk->round_rate != NULL)
586 return clk->round_rate(clk, rate);
591 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
598 ret = clk->set_rate(clk, rate);
599 else if (clk->flags & RATE_CKCTL) {
600 dsor_exp = calc_dsor_exp(clk, rate);
606 regval = omap_readw(ARM_CKCTL);
607 regval &= ~(3 << clk->rate_offset);
608 regval |= dsor_exp << clk->rate_offset;
609 regval = verify_ckctl_value(regval);
610 omap_writew(regval, ARM_CKCTL);
611 clk->rate = clk->parent->rate / (1 << dsor_exp);
618 /*-------------------------------------------------------------------------
619 * Omap1 clock reset and init functions
620 *-------------------------------------------------------------------------*/
622 #ifdef CONFIG_OMAP_RESET_CLOCKS
624 static void __init omap1_clk_disable_unused(struct clk *clk)
628 /* Clocks in the DSP domain need api_ck. Just assume bootloader
629 * has not enabled any DSP clocks */
630 if (clk->enable_reg == DSP_IDLECT2) {
631 printk(KERN_INFO "Skipping reset check for DSP domain "
632 "clock \"%s\"\n", clk->name);
636 /* Is the clock already disabled? */
637 if (clk->flags & ENABLE_REG_32BIT)
638 regval32 = __raw_readl(clk->enable_reg);
640 regval32 = __raw_readw(clk->enable_reg);
642 if ((regval32 & (1 << clk->enable_bit)) == 0)
645 /* FIXME: This clock seems to be necessary but no-one
646 * has asked for its activation. */
647 if (clk == &tc2_ck /* FIX: pm.c (SRAM), CCP, Camera */
648 || clk == &ck_dpll1out.clk /* FIX: SoSSI, SSR */
649 || clk == &arm_gpio_ck /* FIX: GPIO code for 1510 */
651 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
656 printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
662 #define omap1_clk_disable_unused NULL
665 static struct clk_functions omap1_clk_functions = {
666 .clk_enable = omap1_clk_enable,
667 .clk_disable = omap1_clk_disable,
668 .clk_round_rate = omap1_clk_round_rate,
669 .clk_set_rate = omap1_clk_set_rate,
670 .clk_disable_unused = omap1_clk_disable_unused,
673 int __init omap1_clk_init(void)
676 const struct omap_clock_config *info;
677 int crystal_type = 0; /* Default 12 MHz */
680 #ifdef CONFIG_DEBUG_LL
681 /* Resets some clocks that may be left on from bootloader,
682 * but leaves serial clocks on.
684 omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
687 /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
688 reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
689 omap_writew(reg, SOFT_REQ_REG);
690 if (!cpu_is_omap15xx())
691 omap_writew(0, SOFT_REQ_REG2);
693 clk_init(&omap1_clk_functions);
695 /* By default all idlect1 clocks are allowed to idle */
696 arm_idlect1_mask = ~0;
698 for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
699 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
704 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
709 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
714 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
720 info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
722 if (!cpu_is_omap15xx())
723 crystal_type = info->system_clock_type;
726 #if defined(CONFIG_ARCH_OMAP730)
727 ck_ref.rate = 13000000;
728 #elif defined(CONFIG_ARCH_OMAP16XX)
729 if (crystal_type == 2)
730 ck_ref.rate = 19200000;
733 printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
734 omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
735 omap_readw(ARM_CKCTL));
737 /* We want to be in syncronous scalable mode */
738 omap_writew(0x1000, ARM_SYSST);
740 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
741 /* Use values set by bootloader. Determine PLL rate and recalculate
742 * dependent clocks as if kernel had changed PLL or divisors.
745 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
747 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
748 if (pll_ctl_val & 0x10) {
749 /* PLL enabled, apply multiplier and divisor */
750 if (pll_ctl_val & 0xf80)
751 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
752 ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
754 /* PLL disabled, apply bypass divisor */
755 switch (pll_ctl_val & 0xc) {
767 propagate_rate(&ck_dpll1, CURRENT_RATE);
769 /* Find the highest supported frequency and enable it */
770 if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
771 printk(KERN_ERR "System frequencies not set. Check your config.\n");
772 /* Guess sane values (60MHz) */
773 omap_writew(0x2290, DPLL_CTL);
774 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
775 ck_dpll1.rate = 60000000;
776 propagate_rate(&ck_dpll1, CURRENT_RATE);
779 /* Cache rates for clocks connected to ck_ref (not dpll1) */
780 propagate_rate(&ck_ref, CURRENT_RATE);
781 printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
782 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
783 ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
784 ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
785 arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
787 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
788 /* Select slicer output as OMAP input clock */
789 omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
792 /* Amstrad Delta wants BCLK high when inactive */
793 if (machine_is_ams_delta())
794 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
795 (1 << SDW_MCLK_INV_BIT),
798 /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
799 /* (on 730, bit 13 must not be cleared) */
800 if (cpu_is_omap730())
801 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
803 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
805 /* Put DSP/MPUI into reset until needed */
806 omap_writew(0, ARM_RSTCT1);
807 omap_writew(1, ARM_RSTCT2);
808 omap_writew(0x400, ARM_IDLECT1);
811 * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
812 * of the ARM_IDLECT2 register must be set to zero. The power-on
813 * default value of this bit is one.
815 omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */
818 * Only enable those clocks we will need, let the drivers
819 * enable other clocks as necessary
821 clk_enable(&armper_ck.clk);
822 clk_enable(&armxor_ck.clk);
823 clk_enable(&armtim_ck.clk); /* This should be done by timer code */
825 if (cpu_is_omap15xx())
826 clk_enable(&arm_gpio_ck);