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)
39 clk->rate = clk->parent->rate / 14;
42 static void omap1_uart_recalc(struct clk * clk)
44 unsigned int val = __raw_readl(clk->enable_reg);
45 if (val & clk->enable_bit)
51 static void omap1_sossi_recalc(struct clk *clk)
53 u32 div = omap_readl(MOD_CONF_CTRL_1);
55 div = (div >> 17) & 0x7;
57 clk->rate = clk->parent->rate / div;
60 static int omap1_clk_enable_dsp_domain(struct clk *clk)
64 retval = omap1_clk_enable(&api_ck.clk);
66 retval = omap1_clk_enable_generic(clk);
67 omap1_clk_disable(&api_ck.clk);
73 static void omap1_clk_disable_dsp_domain(struct clk *clk)
75 if (omap1_clk_enable(&api_ck.clk) == 0) {
76 omap1_clk_disable_generic(clk);
77 omap1_clk_disable(&api_ck.clk);
81 static int omap1_clk_enable_uart_functional(struct clk *clk)
84 struct uart_clk *uclk;
86 ret = omap1_clk_enable_generic(clk);
88 /* Set smart idle acknowledgement mode */
89 uclk = (struct uart_clk *)clk;
90 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
97 static void omap1_clk_disable_uart_functional(struct clk *clk)
99 struct uart_clk *uclk;
101 /* Set force idle acknowledgement mode */
102 uclk = (struct uart_clk *)clk;
103 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
105 omap1_clk_disable_generic(clk);
108 static void omap1_clk_allow_idle(struct clk *clk)
110 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
112 if (!(clk->flags & CLOCK_IDLE_CONTROL))
115 if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
116 arm_idlect1_mask |= 1 << iclk->idlect_shift;
119 static void omap1_clk_deny_idle(struct clk *clk)
121 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
123 if (!(clk->flags & CLOCK_IDLE_CONTROL))
126 if (iclk->no_idle_count++ == 0)
127 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
130 static __u16 verify_ckctl_value(__u16 newval)
132 /* This function checks for following limitations set
133 * by the hardware (all conditions must be true):
134 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
139 * In addition following rules are enforced:
143 * However, maximum frequencies are not checked for!
152 per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
153 lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
154 arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
155 dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
156 tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
157 dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
159 if (dspmmu_exp < dsp_exp)
160 dspmmu_exp = dsp_exp;
161 if (dspmmu_exp > dsp_exp+1)
162 dspmmu_exp = dsp_exp+1;
163 if (tc_exp < arm_exp)
165 if (tc_exp < dspmmu_exp)
167 if (tc_exp > lcd_exp)
169 if (tc_exp > per_exp)
173 newval |= per_exp << CKCTL_PERDIV_OFFSET;
174 newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
175 newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
176 newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
177 newval |= tc_exp << CKCTL_TCDIV_OFFSET;
178 newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
183 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
185 /* Note: If target frequency is too low, this function will return 4,
186 * which is invalid value. Caller must check for this value and act
189 * Note: This function does not check for following limitations set
190 * by the hardware (all conditions must be true):
191 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
196 unsigned long realrate;
200 if (unlikely(!(clk->flags & RATE_CKCTL)))
203 parent = clk->parent;
204 if (unlikely(parent == NULL))
207 realrate = parent->rate;
208 for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
209 if (realrate <= rate)
218 static void omap1_ckctl_recalc(struct clk * clk)
222 /* Calculate divisor encoded as 2-bit exponent */
223 dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
225 if (unlikely(clk->rate == clk->parent->rate / dsor))
226 return; /* No change, quick exit */
227 clk->rate = clk->parent->rate / dsor;
230 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
234 /* Calculate divisor encoded as 2-bit exponent
236 * The clock control bits are in DSP domain,
237 * so api_ck is needed for access.
238 * Note that DSP_CKCTL virt addr = phys addr, so
239 * we must use __raw_readw() instead of omap_readw().
241 omap1_clk_enable(&api_ck.clk);
242 dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
243 omap1_clk_disable(&api_ck.clk);
245 if (unlikely(clk->rate == clk->parent->rate / dsor))
246 return; /* No change, quick exit */
247 clk->rate = clk->parent->rate / dsor;
250 /* MPU virtual clock functions */
251 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
253 /* Find the highest supported frequency <= rate and switch to it */
254 struct mpu_rate * ptr;
256 if (clk != &virtual_ck_mpu)
259 for (ptr = rate_table; ptr->rate; ptr++) {
260 if (ptr->xtal != ck_ref.rate)
263 /* DPLL1 cannot be reprogrammed without risking system crash */
264 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
267 /* Can check only after xtal frequency check */
268 if (ptr->rate <= rate)
276 * In most cases we should not need to reprogram DPLL.
277 * Reprogramming the DPLL is tricky, it must be done from SRAM.
278 * (on 730, bit 13 must always be 1)
280 if (cpu_is_omap730())
281 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
283 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
285 ck_dpll1.rate = ptr->pll_rate;
286 propagate_rate(&ck_dpll1);
290 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
296 if (clk->flags & RATE_CKCTL) {
297 dsor_exp = calc_dsor_exp(clk, rate);
303 regval = __raw_readw(DSP_CKCTL);
304 regval &= ~(3 << clk->rate_offset);
305 regval |= dsor_exp << clk->rate_offset;
306 __raw_writew(regval, DSP_CKCTL);
307 clk->rate = clk->parent->rate / (1 << dsor_exp);
314 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
316 /* Find the highest supported frequency <= rate */
317 struct mpu_rate * ptr;
320 if (clk != &virtual_ck_mpu)
323 highest_rate = -EINVAL;
325 for (ptr = rate_table; ptr->rate; ptr++) {
326 if (ptr->xtal != ck_ref.rate)
329 highest_rate = ptr->rate;
331 /* Can check only after xtal frequency check */
332 if (ptr->rate <= rate)
339 static unsigned calc_ext_dsor(unsigned long rate)
343 /* MCLK and BCLK divisor selection is not linear:
344 * freq = 96MHz / dsor
346 * RATIO_SEL range: dsor <-> RATIO_SEL
347 * 0..6: (RATIO_SEL+2) <-> (dsor-2)
348 * 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
349 * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
352 for (dsor = 2; dsor < 96; ++dsor) {
353 if ((dsor & 1) && dsor > 8)
355 if (rate >= 96000000 / dsor)
361 /* Only needed on 1510 */
362 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
366 val = __raw_readl(clk->enable_reg);
367 if (rate == 12000000)
368 val &= ~(1 << clk->enable_bit);
369 else if (rate == 48000000)
370 val |= (1 << clk->enable_bit);
373 __raw_writel(val, clk->enable_reg);
379 /* External clock (MCLK & BCLK) functions */
380 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
385 dsor = calc_ext_dsor(rate);
386 clk->rate = 96000000 / dsor;
388 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
390 ratio_bits = (dsor - 2) << 2;
392 ratio_bits |= __raw_readw(clk->enable_reg) & ~0xfd;
393 __raw_writew(ratio_bits, clk->enable_reg);
398 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
402 unsigned long p_rate;
404 p_rate = clk->parent->rate;
405 /* Round towards slower frequency */
406 div = (p_rate + rate - 1) / rate;
408 if (div < 0 || div > 7)
411 l = omap_readl(MOD_CONF_CTRL_1);
414 omap_writel(l, MOD_CONF_CTRL_1);
416 clk->rate = p_rate / (div + 1);
421 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
423 return 96000000 / calc_ext_dsor(rate);
426 static void omap1_init_ext_clk(struct clk * clk)
431 /* Determine current rate and ensure clock is based on 96MHz APLL */
432 ratio_bits = __raw_readw(clk->enable_reg) & ~1;
433 __raw_writew(ratio_bits, clk->enable_reg);
435 ratio_bits = (ratio_bits & 0xfc) >> 2;
437 dsor = (ratio_bits - 6) * 2 + 8;
439 dsor = ratio_bits + 2;
441 clk-> rate = 96000000 / dsor;
444 static int omap1_clk_enable(struct clk *clk)
447 if (clk->usecount++ == 0) {
448 if (likely(clk->parent)) {
449 ret = omap1_clk_enable(clk->parent);
451 if (unlikely(ret != 0)) {
456 if (clk->flags & CLOCK_NO_IDLE_PARENT)
457 omap1_clk_deny_idle(clk->parent);
460 ret = clk->enable(clk);
462 if (unlikely(ret != 0) && clk->parent) {
463 omap1_clk_disable(clk->parent);
471 static void omap1_clk_disable(struct clk *clk)
473 if (clk->usecount > 0 && !(--clk->usecount)) {
475 if (likely(clk->parent)) {
476 omap1_clk_disable(clk->parent);
477 if (clk->flags & CLOCK_NO_IDLE_PARENT)
478 omap1_clk_allow_idle(clk->parent);
483 static int omap1_clk_enable_generic(struct clk *clk)
488 if (clk->flags & ALWAYS_ENABLED)
491 if (unlikely(clk->enable_reg == NULL)) {
492 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
497 if (clk->flags & ENABLE_REG_32BIT) {
498 regval32 = __raw_readl(clk->enable_reg);
499 regval32 |= (1 << clk->enable_bit);
500 __raw_writel(regval32, clk->enable_reg);
502 regval16 = __raw_readw(clk->enable_reg);
503 regval16 |= (1 << clk->enable_bit);
504 __raw_writew(regval16, clk->enable_reg);
510 static void omap1_clk_disable_generic(struct clk *clk)
515 if (clk->enable_reg == NULL)
518 if (clk->flags & ENABLE_REG_32BIT) {
519 regval32 = __raw_readl(clk->enable_reg);
520 regval32 &= ~(1 << clk->enable_bit);
521 __raw_writel(regval32, clk->enable_reg);
523 regval16 = __raw_readw(clk->enable_reg);
524 regval16 &= ~(1 << clk->enable_bit);
525 __raw_writew(regval16, clk->enable_reg);
529 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
533 if (clk->flags & RATE_FIXED)
536 if (clk->flags & RATE_CKCTL) {
537 dsor_exp = calc_dsor_exp(clk, rate);
542 return clk->parent->rate / (1 << dsor_exp);
545 if (clk->round_rate != NULL)
546 return clk->round_rate(clk, rate);
551 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
558 ret = clk->set_rate(clk, rate);
559 else if (clk->flags & RATE_CKCTL) {
560 dsor_exp = calc_dsor_exp(clk, rate);
566 regval = omap_readw(ARM_CKCTL);
567 regval &= ~(3 << clk->rate_offset);
568 regval |= dsor_exp << clk->rate_offset;
569 regval = verify_ckctl_value(regval);
570 omap_writew(regval, ARM_CKCTL);
571 clk->rate = clk->parent->rate / (1 << dsor_exp);
578 /*-------------------------------------------------------------------------
579 * Omap1 clock reset and init functions
580 *-------------------------------------------------------------------------*/
582 #ifdef CONFIG_OMAP_RESET_CLOCKS
584 static void __init omap1_clk_disable_unused(struct clk *clk)
588 /* Clocks in the DSP domain need api_ck. Just assume bootloader
589 * has not enabled any DSP clocks */
590 if (clk->enable_reg == DSP_IDLECT2) {
591 printk(KERN_INFO "Skipping reset check for DSP domain "
592 "clock \"%s\"\n", clk->name);
596 /* Is the clock already disabled? */
597 if (clk->flags & ENABLE_REG_32BIT)
598 regval32 = __raw_readl(clk->enable_reg);
600 regval32 = __raw_readw(clk->enable_reg);
602 if ((regval32 & (1 << clk->enable_bit)) == 0)
605 /* FIXME: This clock seems to be necessary but no-one
606 * has asked for its activation. */
607 if (clk == &tc2_ck /* FIX: pm.c (SRAM), CCP, Camera */
608 || clk == &ck_dpll1out.clk /* FIX: SoSSI, SSR */
609 || clk == &arm_gpio_ck /* FIX: GPIO code for 1510 */
611 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
616 printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
622 #define omap1_clk_disable_unused NULL
625 static struct clk_functions omap1_clk_functions = {
626 .clk_enable = omap1_clk_enable,
627 .clk_disable = omap1_clk_disable,
628 .clk_round_rate = omap1_clk_round_rate,
629 .clk_set_rate = omap1_clk_set_rate,
630 .clk_disable_unused = omap1_clk_disable_unused,
633 int __init omap1_clk_init(void)
636 const struct omap_clock_config *info;
637 int crystal_type = 0; /* Default 12 MHz */
640 #ifdef CONFIG_DEBUG_LL
641 /* Resets some clocks that may be left on from bootloader,
642 * but leaves serial clocks on.
644 omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
647 /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
648 reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
649 omap_writew(reg, SOFT_REQ_REG);
650 if (!cpu_is_omap15xx())
651 omap_writew(0, SOFT_REQ_REG2);
653 clk_init(&omap1_clk_functions);
655 /* By default all idlect1 clocks are allowed to idle */
656 arm_idlect1_mask = ~0;
658 for (clkp = onchip_clks; clkp < onchip_clks+ARRAY_SIZE(onchip_clks); clkp++) {
659 if (((*clkp)->flags &CLOCK_IN_OMAP1510) && cpu_is_omap1510()) {
664 if (((*clkp)->flags &CLOCK_IN_OMAP16XX) && cpu_is_omap16xx()) {
669 if (((*clkp)->flags &CLOCK_IN_OMAP730) && cpu_is_omap730()) {
674 if (((*clkp)->flags &CLOCK_IN_OMAP310) && cpu_is_omap310()) {
680 info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
682 if (!cpu_is_omap15xx())
683 crystal_type = info->system_clock_type;
686 #if defined(CONFIG_ARCH_OMAP730)
687 ck_ref.rate = 13000000;
688 #elif defined(CONFIG_ARCH_OMAP16XX)
689 if (crystal_type == 2)
690 ck_ref.rate = 19200000;
693 printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
694 omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
695 omap_readw(ARM_CKCTL));
697 /* We want to be in syncronous scalable mode */
698 omap_writew(0x1000, ARM_SYSST);
700 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
701 /* Use values set by bootloader. Determine PLL rate and recalculate
702 * dependent clocks as if kernel had changed PLL or divisors.
705 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
707 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
708 if (pll_ctl_val & 0x10) {
709 /* PLL enabled, apply multiplier and divisor */
710 if (pll_ctl_val & 0xf80)
711 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
712 ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
714 /* PLL disabled, apply bypass divisor */
715 switch (pll_ctl_val & 0xc) {
727 propagate_rate(&ck_dpll1);
729 /* Find the highest supported frequency and enable it */
730 if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
731 printk(KERN_ERR "System frequencies not set. Check your config.\n");
732 /* Guess sane values (60MHz) */
733 omap_writew(0x2290, DPLL_CTL);
734 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
735 ck_dpll1.rate = 60000000;
736 propagate_rate(&ck_dpll1);
739 /* Cache rates for clocks connected to ck_ref (not dpll1) */
740 propagate_rate(&ck_ref);
741 printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
742 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
743 ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
744 ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
745 arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
747 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
748 /* Select slicer output as OMAP input clock */
749 omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
752 /* Amstrad Delta wants BCLK high when inactive */
753 if (machine_is_ams_delta())
754 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
755 (1 << SDW_MCLK_INV_BIT),
758 /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
759 /* (on 730, bit 13 must not be cleared) */
760 if (cpu_is_omap730())
761 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
763 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
765 /* Put DSP/MPUI into reset until needed */
766 omap_writew(0, ARM_RSTCT1);
767 omap_writew(1, ARM_RSTCT2);
768 omap_writew(0x400, ARM_IDLECT1);
771 * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
772 * of the ARM_IDLECT2 register must be set to zero. The power-on
773 * default value of this bit is one.
775 omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */
778 * Only enable those clocks we will need, let the drivers
779 * enable other clocks as necessary
781 clk_enable(&armper_ck.clk);
782 clk_enable(&armxor_ck.clk);
783 clk_enable(&armtim_ck.clk); /* This should be done by timer code */
785 if (cpu_is_omap15xx())
786 clk_enable(&arm_gpio_ck);