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>
23 #include <asm/clkdev.h>
27 #include <mach/clock.h>
28 #include <mach/sram.h>
30 static const struct clkops clkops_generic;
31 static const struct clkops clkops_uart;
32 static const struct clkops clkops_dspck;
36 static int clk_omap1_dummy_enable(struct clk *clk)
41 static void clk_omap1_dummy_disable(struct clk *clk)
45 static const struct clkops clkops_dummy = {
46 .enable = clk_omap1_dummy_enable,
47 .disable = clk_omap1_dummy_disable,
50 static struct clk dummy_ck = {
61 #define CLK(dev, con, ck, cp) \
71 #define CK_310 (1 << 0)
72 #define CK_730 (1 << 1)
73 #define CK_1510 (1 << 2)
74 #define CK_16XX (1 << 3)
76 static struct omap_clk omap_clks[] = {
78 CLK(NULL, "ck_ref", &ck_ref, CK_16XX | CK_1510 | CK_310),
79 CLK(NULL, "ck_dpll1", &ck_dpll1, CK_16XX | CK_1510 | CK_310),
81 CLK(NULL, "ck_dpll1out", &ck_dpll1out.clk, CK_16XX),
82 CLK(NULL, "ck_sossi", &sossi_ck, CK_16XX),
83 CLK(NULL, "arm_ck", &arm_ck, CK_16XX | CK_1510 | CK_310),
84 CLK(NULL, "armper_ck", &armper_ck.clk, CK_16XX | CK_1510 | CK_310),
85 CLK(NULL, "arm_gpio_ck", &arm_gpio_ck, CK_1510 | CK_310),
86 CLK(NULL, "armxor_ck", &armxor_ck.clk, CK_16XX | CK_1510 | CK_310),
87 CLK(NULL, "armtim_ck", &armtim_ck.clk, CK_16XX | CK_1510 | CK_310),
88 CLK("omap_wdt", "fck", &armwdt_ck.clk, CK_16XX | CK_1510 | CK_310),
89 CLK("omap_wdt", "ick", &armper_ck.clk, CK_16XX),
90 CLK("omap_wdt", "ick", &dummy_ck, CK_1510 | CK_310),
91 CLK(NULL, "arminth_ck", &arminth_ck1510, CK_1510 | CK_310),
92 CLK(NULL, "arminth_ck", &arminth_ck16xx, CK_16XX),
94 CLK(NULL, "dsp_ck", &dsp_ck, CK_16XX | CK_1510 | CK_310),
95 CLK(NULL, "dspmmu_ck", &dspmmu_ck, CK_16XX | CK_1510 | CK_310),
96 CLK(NULL, "dspper_ck", &dspper_ck, CK_16XX | CK_1510 | CK_310),
97 CLK(NULL, "dspxor_ck", &dspxor_ck, CK_16XX | CK_1510 | CK_310),
98 CLK(NULL, "dsptim_ck", &dsptim_ck, CK_16XX | CK_1510 | CK_310),
100 CLK(NULL, "tc_ck", &tc_ck.clk, CK_16XX | CK_1510 | CK_310 | CK_730),
101 CLK(NULL, "tipb_ck", &tipb_ck, CK_1510 | CK_310),
102 CLK(NULL, "l3_ocpi_ck", &l3_ocpi_ck, CK_16XX),
103 CLK(NULL, "tc1_ck", &tc1_ck, CK_16XX),
104 CLK(NULL, "tc2_ck", &tc2_ck, CK_16XX),
105 CLK(NULL, "dma_ck", &dma_ck, CK_16XX | CK_1510 | CK_310),
106 CLK(NULL, "dma_lcdfree_ck", &dma_lcdfree_ck, CK_16XX),
107 CLK(NULL, "api_ck", &api_ck.clk, CK_16XX | CK_1510 | CK_310),
108 CLK(NULL, "lb_ck", &lb_ck.clk, CK_1510 | CK_310),
109 CLK(NULL, "rhea1_ck", &rhea1_ck, CK_16XX),
110 CLK(NULL, "rhea2_ck", &rhea2_ck, CK_16XX),
111 CLK(NULL, "lcd_ck", &lcd_ck_16xx, CK_16XX | CK_730),
112 CLK(NULL, "lcd_ck", &lcd_ck_1510.clk, CK_1510 | CK_310),
114 CLK(NULL, "uart1_ck", &uart1_1510, CK_1510 | CK_310),
115 CLK(NULL, "uart1_ck", &uart1_16xx.clk, CK_16XX),
116 CLK(NULL, "uart2_ck", &uart2_ck, CK_16XX | CK_1510 | CK_310),
117 CLK(NULL, "uart3_ck", &uart3_1510, CK_1510 | CK_310),
118 CLK(NULL, "uart3_ck", &uart3_16xx.clk, CK_16XX),
119 CLK(NULL, "usb_clko", &usb_clko, CK_16XX | CK_1510 | CK_310),
120 CLK(NULL, "usb_hhc_ck", &usb_hhc_ck1510, CK_1510 | CK_310),
121 CLK(NULL, "usb_hhc_ck", &usb_hhc_ck16xx, CK_16XX),
122 CLK(NULL, "usb_dc_ck", &usb_dc_ck, CK_16XX),
123 CLK(NULL, "mclk", &mclk_1510, CK_1510 | CK_310),
124 CLK(NULL, "mclk", &mclk_16xx, CK_16XX),
125 CLK(NULL, "bclk", &bclk_1510, CK_1510 | CK_310),
126 CLK(NULL, "bclk", &bclk_16xx, CK_16XX),
127 CLK("mmci-omap.0", "fck", &mmc1_ck, CK_16XX | CK_1510 | CK_310),
128 CLK("mmci-omap.0", "ick", &armper_ck.clk, CK_16XX | CK_1510 | CK_310),
129 CLK("mmci-omap.1", "fck", &mmc2_ck, CK_16XX),
130 CLK("mmci-omap.1", "ick", &armper_ck.clk, CK_16XX),
132 CLK(NULL, "mpu", &virtual_ck_mpu, CK_16XX | CK_1510 | CK_310),
133 CLK("i2c_omap.1", "fck", &i2c_fck, CK_16XX | CK_1510 | CK_310),
134 CLK("i2c_omap.1", "ick", &i2c_ick, CK_16XX),
135 CLK("i2c_omap.1", "ick", &dummy_ck, CK_1510 | CK_310),
136 CLK("omap_uwire", "fck", &armxor_ck.clk, CK_16XX | CK_1510 | CK_310),
137 CLK("omap-mcbsp.1", "ick", &dspper_ck, CK_16XX),
138 CLK("omap-mcbsp.1", "ick", &dummy_ck, CK_1510 | CK_310),
139 CLK("omap-mcbsp.2", "ick", &armper_ck.clk, CK_16XX),
140 CLK("omap-mcbsp.2", "ick", &dummy_ck, CK_1510 | CK_310),
141 CLK("omap-mcbsp.3", "ick", &dspper_ck, CK_16XX),
142 CLK("omap-mcbsp.3", "ick", &dummy_ck, CK_1510 | CK_310),
143 CLK("omap-mcbsp.1", "fck", &dspxor_ck, CK_16XX | CK_1510 | CK_310),
144 CLK("omap-mcbsp.2", "fck", &armper_ck.clk, CK_16XX | CK_1510 | CK_310),
145 CLK("omap-mcbsp.3", "fck", &dspxor_ck, CK_16XX | CK_1510 | CK_310),
148 static int omap1_clk_enable_generic(struct clk * clk);
149 static int omap1_clk_enable(struct clk *clk);
150 static void omap1_clk_disable_generic(struct clk * clk);
151 static void omap1_clk_disable(struct clk *clk);
153 __u32 arm_idlect1_mask;
155 /*-------------------------------------------------------------------------
156 * Omap1 specific clock functions
157 *-------------------------------------------------------------------------*/
159 static void omap1_watchdog_recalc(struct clk * clk)
161 clk->rate = clk->parent->rate / 14;
164 static void omap1_uart_recalc(struct clk * clk)
166 unsigned int val = omap_readl(clk->enable_reg);
167 if (val & clk->enable_bit)
168 clk->rate = 48000000;
170 clk->rate = 12000000;
173 static void omap1_sossi_recalc(struct clk *clk)
175 u32 div = omap_readl(MOD_CONF_CTRL_1);
177 div = (div >> 17) & 0x7;
179 clk->rate = clk->parent->rate / div;
182 static int omap1_clk_enable_dsp_domain(struct clk *clk)
186 retval = omap1_clk_enable(&api_ck.clk);
188 retval = omap1_clk_enable_generic(clk);
189 omap1_clk_disable(&api_ck.clk);
195 static void omap1_clk_disable_dsp_domain(struct clk *clk)
197 if (omap1_clk_enable(&api_ck.clk) == 0) {
198 omap1_clk_disable_generic(clk);
199 omap1_clk_disable(&api_ck.clk);
203 static const struct clkops clkops_dspck = {
204 .enable = &omap1_clk_enable_dsp_domain,
205 .disable = &omap1_clk_disable_dsp_domain,
208 static int omap1_clk_enable_uart_functional(struct clk *clk)
211 struct uart_clk *uclk;
213 ret = omap1_clk_enable_generic(clk);
215 /* Set smart idle acknowledgement mode */
216 uclk = (struct uart_clk *)clk;
217 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x10) | 8,
224 static void omap1_clk_disable_uart_functional(struct clk *clk)
226 struct uart_clk *uclk;
228 /* Set force idle acknowledgement mode */
229 uclk = (struct uart_clk *)clk;
230 omap_writeb((omap_readb(uclk->sysc_addr) & ~0x18), uclk->sysc_addr);
232 omap1_clk_disable_generic(clk);
235 static const struct clkops clkops_uart = {
236 .enable = &omap1_clk_enable_uart_functional,
237 .disable = &omap1_clk_disable_uart_functional,
240 static void omap1_clk_allow_idle(struct clk *clk)
242 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
244 if (!(clk->flags & CLOCK_IDLE_CONTROL))
247 if (iclk->no_idle_count > 0 && !(--iclk->no_idle_count))
248 arm_idlect1_mask |= 1 << iclk->idlect_shift;
251 static void omap1_clk_deny_idle(struct clk *clk)
253 struct arm_idlect1_clk * iclk = (struct arm_idlect1_clk *)clk;
255 if (!(clk->flags & CLOCK_IDLE_CONTROL))
258 if (iclk->no_idle_count++ == 0)
259 arm_idlect1_mask &= ~(1 << iclk->idlect_shift);
262 static __u16 verify_ckctl_value(__u16 newval)
264 /* This function checks for following limitations set
265 * by the hardware (all conditions must be true):
266 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
271 * In addition following rules are enforced:
275 * However, maximum frequencies are not checked for!
284 per_exp = (newval >> CKCTL_PERDIV_OFFSET) & 3;
285 lcd_exp = (newval >> CKCTL_LCDDIV_OFFSET) & 3;
286 arm_exp = (newval >> CKCTL_ARMDIV_OFFSET) & 3;
287 dsp_exp = (newval >> CKCTL_DSPDIV_OFFSET) & 3;
288 tc_exp = (newval >> CKCTL_TCDIV_OFFSET) & 3;
289 dspmmu_exp = (newval >> CKCTL_DSPMMUDIV_OFFSET) & 3;
291 if (dspmmu_exp < dsp_exp)
292 dspmmu_exp = dsp_exp;
293 if (dspmmu_exp > dsp_exp+1)
294 dspmmu_exp = dsp_exp+1;
295 if (tc_exp < arm_exp)
297 if (tc_exp < dspmmu_exp)
299 if (tc_exp > lcd_exp)
301 if (tc_exp > per_exp)
305 newval |= per_exp << CKCTL_PERDIV_OFFSET;
306 newval |= lcd_exp << CKCTL_LCDDIV_OFFSET;
307 newval |= arm_exp << CKCTL_ARMDIV_OFFSET;
308 newval |= dsp_exp << CKCTL_DSPDIV_OFFSET;
309 newval |= tc_exp << CKCTL_TCDIV_OFFSET;
310 newval |= dspmmu_exp << CKCTL_DSPMMUDIV_OFFSET;
315 static int calc_dsor_exp(struct clk *clk, unsigned long rate)
317 /* Note: If target frequency is too low, this function will return 4,
318 * which is invalid value. Caller must check for this value and act
321 * Note: This function does not check for following limitations set
322 * by the hardware (all conditions must be true):
323 * DSPMMU_CK == DSP_CK or DSPMMU_CK == DSP_CK/2
328 unsigned long realrate;
332 parent = clk->parent;
333 if (unlikely(parent == NULL))
336 realrate = parent->rate;
337 for (dsor_exp=0; dsor_exp<4; dsor_exp++) {
338 if (realrate <= rate)
347 static void omap1_ckctl_recalc(struct clk * clk)
351 /* Calculate divisor encoded as 2-bit exponent */
352 dsor = 1 << (3 & (omap_readw(ARM_CKCTL) >> clk->rate_offset));
354 if (unlikely(clk->rate == clk->parent->rate / dsor))
355 return; /* No change, quick exit */
356 clk->rate = clk->parent->rate / dsor;
359 static void omap1_ckctl_recalc_dsp_domain(struct clk * clk)
363 /* Calculate divisor encoded as 2-bit exponent
365 * The clock control bits are in DSP domain,
366 * so api_ck is needed for access.
367 * Note that DSP_CKCTL virt addr = phys addr, so
368 * we must use __raw_readw() instead of omap_readw().
370 omap1_clk_enable(&api_ck.clk);
371 dsor = 1 << (3 & (__raw_readw(DSP_CKCTL) >> clk->rate_offset));
372 omap1_clk_disable(&api_ck.clk);
374 if (unlikely(clk->rate == clk->parent->rate / dsor))
375 return; /* No change, quick exit */
376 clk->rate = clk->parent->rate / dsor;
379 /* MPU virtual clock functions */
380 static int omap1_select_table_rate(struct clk * clk, unsigned long rate)
382 /* Find the highest supported frequency <= rate and switch to it */
383 struct mpu_rate * ptr;
385 if (clk != &virtual_ck_mpu)
388 for (ptr = rate_table; ptr->rate; ptr++) {
389 if (ptr->xtal != ck_ref.rate)
392 /* DPLL1 cannot be reprogrammed without risking system crash */
393 if (likely(ck_dpll1.rate!=0) && ptr->pll_rate != ck_dpll1.rate)
396 /* Can check only after xtal frequency check */
397 if (ptr->rate <= rate)
405 * In most cases we should not need to reprogram DPLL.
406 * Reprogramming the DPLL is tricky, it must be done from SRAM.
407 * (on 730, bit 13 must always be 1)
409 if (cpu_is_omap730())
410 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val | 0x2000);
412 omap_sram_reprogram_clock(ptr->dpllctl_val, ptr->ckctl_val);
414 ck_dpll1.rate = ptr->pll_rate;
418 static int omap1_clk_set_rate_dsp_domain(struct clk *clk, unsigned long rate)
423 dsor_exp = calc_dsor_exp(clk, rate);
429 regval = __raw_readw(DSP_CKCTL);
430 regval &= ~(3 << clk->rate_offset);
431 regval |= dsor_exp << clk->rate_offset;
432 __raw_writew(regval, DSP_CKCTL);
433 clk->rate = clk->parent->rate / (1 << dsor_exp);
438 static long omap1_clk_round_rate_ckctl_arm(struct clk *clk, unsigned long rate)
440 int dsor_exp = calc_dsor_exp(clk, rate);
445 return clk->parent->rate / (1 << dsor_exp);
448 static int omap1_clk_set_rate_ckctl_arm(struct clk *clk, unsigned long rate)
453 dsor_exp = calc_dsor_exp(clk, rate);
459 regval = omap_readw(ARM_CKCTL);
460 regval &= ~(3 << clk->rate_offset);
461 regval |= dsor_exp << clk->rate_offset;
462 regval = verify_ckctl_value(regval);
463 omap_writew(regval, ARM_CKCTL);
464 clk->rate = clk->parent->rate / (1 << dsor_exp);
468 static long omap1_round_to_table_rate(struct clk * clk, unsigned long rate)
470 /* Find the highest supported frequency <= rate */
471 struct mpu_rate * ptr;
474 if (clk != &virtual_ck_mpu)
477 highest_rate = -EINVAL;
479 for (ptr = rate_table; ptr->rate; ptr++) {
480 if (ptr->xtal != ck_ref.rate)
483 highest_rate = ptr->rate;
485 /* Can check only after xtal frequency check */
486 if (ptr->rate <= rate)
493 static unsigned calc_ext_dsor(unsigned long rate)
497 /* MCLK and BCLK divisor selection is not linear:
498 * freq = 96MHz / dsor
500 * RATIO_SEL range: dsor <-> RATIO_SEL
501 * 0..6: (RATIO_SEL+2) <-> (dsor-2)
502 * 6..48: (8+(RATIO_SEL-6)*2) <-> ((dsor-8)/2+6)
503 * Minimum dsor is 2 and maximum is 96. Odd divisors starting from 9
506 for (dsor = 2; dsor < 96; ++dsor) {
507 if ((dsor & 1) && dsor > 8)
509 if (rate >= 96000000 / dsor)
515 /* Only needed on 1510 */
516 static int omap1_set_uart_rate(struct clk * clk, unsigned long rate)
520 val = omap_readl(clk->enable_reg);
521 if (rate == 12000000)
522 val &= ~(1 << clk->enable_bit);
523 else if (rate == 48000000)
524 val |= (1 << clk->enable_bit);
527 omap_writel(val, clk->enable_reg);
533 /* External clock (MCLK & BCLK) functions */
534 static int omap1_set_ext_clk_rate(struct clk * clk, unsigned long rate)
539 dsor = calc_ext_dsor(rate);
540 clk->rate = 96000000 / dsor;
542 ratio_bits = ((dsor - 8) / 2 + 6) << 2;
544 ratio_bits = (dsor - 2) << 2;
546 ratio_bits |= omap_readw(clk->enable_reg) & ~0xfd;
547 omap_writew(ratio_bits, clk->enable_reg);
552 static int omap1_set_sossi_rate(struct clk *clk, unsigned long rate)
556 unsigned long p_rate;
558 p_rate = clk->parent->rate;
559 /* Round towards slower frequency */
560 div = (p_rate + rate - 1) / rate;
562 if (div < 0 || div > 7)
565 l = omap_readl(MOD_CONF_CTRL_1);
568 omap_writel(l, MOD_CONF_CTRL_1);
570 clk->rate = p_rate / (div + 1);
575 static long omap1_round_ext_clk_rate(struct clk * clk, unsigned long rate)
577 return 96000000 / calc_ext_dsor(rate);
580 static void omap1_init_ext_clk(struct clk * clk)
585 /* Determine current rate and ensure clock is based on 96MHz APLL */
586 ratio_bits = omap_readw(clk->enable_reg) & ~1;
587 omap_writew(ratio_bits, clk->enable_reg);
589 ratio_bits = (ratio_bits & 0xfc) >> 2;
591 dsor = (ratio_bits - 6) * 2 + 8;
593 dsor = ratio_bits + 2;
595 clk-> rate = 96000000 / dsor;
598 static int omap1_clk_enable(struct clk *clk)
601 if (clk->usecount++ == 0) {
602 if (likely(clk->parent)) {
603 ret = omap1_clk_enable(clk->parent);
605 if (unlikely(ret != 0)) {
610 if (clk->flags & CLOCK_NO_IDLE_PARENT)
611 omap1_clk_deny_idle(clk->parent);
614 ret = clk->ops->enable(clk);
616 if (unlikely(ret != 0) && clk->parent) {
617 omap1_clk_disable(clk->parent);
625 static void omap1_clk_disable(struct clk *clk)
627 if (clk->usecount > 0 && !(--clk->usecount)) {
628 clk->ops->disable(clk);
629 if (likely(clk->parent)) {
630 omap1_clk_disable(clk->parent);
631 if (clk->flags & CLOCK_NO_IDLE_PARENT)
632 omap1_clk_allow_idle(clk->parent);
637 static int omap1_clk_enable_generic(struct clk *clk)
642 if (unlikely(clk->enable_reg == NULL)) {
643 printk(KERN_ERR "clock.c: Enable for %s without enable code\n",
648 if (clk->flags & ENABLE_REG_32BIT) {
649 if (clk->flags & VIRTUAL_IO_ADDRESS) {
650 regval32 = __raw_readl(clk->enable_reg);
651 regval32 |= (1 << clk->enable_bit);
652 __raw_writel(regval32, clk->enable_reg);
654 regval32 = omap_readl(clk->enable_reg);
655 regval32 |= (1 << clk->enable_bit);
656 omap_writel(regval32, clk->enable_reg);
659 if (clk->flags & VIRTUAL_IO_ADDRESS) {
660 regval16 = __raw_readw(clk->enable_reg);
661 regval16 |= (1 << clk->enable_bit);
662 __raw_writew(regval16, clk->enable_reg);
664 regval16 = omap_readw(clk->enable_reg);
665 regval16 |= (1 << clk->enable_bit);
666 omap_writew(regval16, clk->enable_reg);
673 static void omap1_clk_disable_generic(struct clk *clk)
678 if (clk->enable_reg == NULL)
681 if (clk->flags & ENABLE_REG_32BIT) {
682 if (clk->flags & VIRTUAL_IO_ADDRESS) {
683 regval32 = __raw_readl(clk->enable_reg);
684 regval32 &= ~(1 << clk->enable_bit);
685 __raw_writel(regval32, clk->enable_reg);
687 regval32 = omap_readl(clk->enable_reg);
688 regval32 &= ~(1 << clk->enable_bit);
689 omap_writel(regval32, clk->enable_reg);
692 if (clk->flags & VIRTUAL_IO_ADDRESS) {
693 regval16 = __raw_readw(clk->enable_reg);
694 regval16 &= ~(1 << clk->enable_bit);
695 __raw_writew(regval16, clk->enable_reg);
697 regval16 = omap_readw(clk->enable_reg);
698 regval16 &= ~(1 << clk->enable_bit);
699 omap_writew(regval16, clk->enable_reg);
704 static const struct clkops clkops_generic = {
705 .enable = &omap1_clk_enable_generic,
706 .disable = &omap1_clk_disable_generic,
709 static long omap1_clk_round_rate(struct clk *clk, unsigned long rate)
711 if (clk->flags & RATE_FIXED)
714 if (clk->round_rate != NULL)
715 return clk->round_rate(clk, rate);
720 static int omap1_clk_set_rate(struct clk *clk, unsigned long rate)
725 ret = clk->set_rate(clk, rate);
729 /*-------------------------------------------------------------------------
730 * Omap1 clock reset and init functions
731 *-------------------------------------------------------------------------*/
733 #ifdef CONFIG_OMAP_RESET_CLOCKS
735 static void __init omap1_clk_disable_unused(struct clk *clk)
739 /* Clocks in the DSP domain need api_ck. Just assume bootloader
740 * has not enabled any DSP clocks */
741 if (clk->enable_reg == DSP_IDLECT2) {
742 printk(KERN_INFO "Skipping reset check for DSP domain "
743 "clock \"%s\"\n", clk->name);
747 /* Is the clock already disabled? */
748 if (clk->flags & ENABLE_REG_32BIT) {
749 if (clk->flags & VIRTUAL_IO_ADDRESS)
750 regval32 = __raw_readl(clk->enable_reg);
752 regval32 = omap_readl(clk->enable_reg);
754 if (clk->flags & VIRTUAL_IO_ADDRESS)
755 regval32 = __raw_readw(clk->enable_reg);
757 regval32 = omap_readw(clk->enable_reg);
760 if ((regval32 & (1 << clk->enable_bit)) == 0)
763 /* FIXME: This clock seems to be necessary but no-one
764 * has asked for its activation. */
765 if (clk == &tc2_ck /* FIX: pm.c (SRAM), CCP, Camera */
766 || clk == &ck_dpll1out.clk /* FIX: SoSSI, SSR */
767 || clk == &arm_gpio_ck /* FIX: GPIO code for 1510 */
769 printk(KERN_INFO "FIXME: Clock \"%s\" seems unused\n",
774 printk(KERN_INFO "Disabling unused clock \"%s\"... ", clk->name);
775 clk->ops->disable(clk);
780 #define omap1_clk_disable_unused NULL
783 static struct clk_functions omap1_clk_functions = {
784 .clk_enable = omap1_clk_enable,
785 .clk_disable = omap1_clk_disable,
786 .clk_round_rate = omap1_clk_round_rate,
787 .clk_set_rate = omap1_clk_set_rate,
788 .clk_disable_unused = omap1_clk_disable_unused,
791 int __init omap1_clk_init(void)
794 const struct omap_clock_config *info;
795 int crystal_type = 0; /* Default 12 MHz */
798 #ifdef CONFIG_DEBUG_LL
799 /* Resets some clocks that may be left on from bootloader,
800 * but leaves serial clocks on.
802 omap_writel(0x3 << 29, MOD_CONF_CTRL_0);
805 /* USB_REQ_EN will be disabled later if necessary (usb_dc_ck) */
806 reg = omap_readw(SOFT_REQ_REG) & (1 << 4);
807 omap_writew(reg, SOFT_REQ_REG);
808 if (!cpu_is_omap15xx())
809 omap_writew(0, SOFT_REQ_REG2);
811 clk_init(&omap1_clk_functions);
813 /* By default all idlect1 clocks are allowed to idle */
814 arm_idlect1_mask = ~0;
817 if (cpu_is_omap16xx())
819 if (cpu_is_omap1510())
821 if (cpu_is_omap730())
823 if (cpu_is_omap310())
826 for (c = omap_clks; c < omap_clks + ARRAY_SIZE(omap_clks); c++)
827 if (c->cpu & cpu_mask) {
829 clk_register(c->lk.clk);
832 info = omap_get_config(OMAP_TAG_CLOCK, struct omap_clock_config);
834 if (!cpu_is_omap15xx())
835 crystal_type = info->system_clock_type;
838 #if defined(CONFIG_ARCH_OMAP730)
839 ck_ref.rate = 13000000;
840 #elif defined(CONFIG_ARCH_OMAP16XX)
841 if (crystal_type == 2)
842 ck_ref.rate = 19200000;
845 printk("Clocks: ARM_SYSST: 0x%04x DPLL_CTL: 0x%04x ARM_CKCTL: 0x%04x\n",
846 omap_readw(ARM_SYSST), omap_readw(DPLL_CTL),
847 omap_readw(ARM_CKCTL));
849 /* We want to be in syncronous scalable mode */
850 omap_writew(0x1000, ARM_SYSST);
852 #ifdef CONFIG_OMAP_CLOCKS_SET_BY_BOOTLOADER
853 /* Use values set by bootloader. Determine PLL rate and recalculate
854 * dependent clocks as if kernel had changed PLL or divisors.
857 unsigned pll_ctl_val = omap_readw(DPLL_CTL);
859 ck_dpll1.rate = ck_ref.rate; /* Base xtal rate */
860 if (pll_ctl_val & 0x10) {
861 /* PLL enabled, apply multiplier and divisor */
862 if (pll_ctl_val & 0xf80)
863 ck_dpll1.rate *= (pll_ctl_val & 0xf80) >> 7;
864 ck_dpll1.rate /= ((pll_ctl_val & 0x60) >> 5) + 1;
866 /* PLL disabled, apply bypass divisor */
867 switch (pll_ctl_val & 0xc) {
880 /* Find the highest supported frequency and enable it */
881 if (omap1_select_table_rate(&virtual_ck_mpu, ~0)) {
882 printk(KERN_ERR "System frequencies not set. Check your config.\n");
883 /* Guess sane values (60MHz) */
884 omap_writew(0x2290, DPLL_CTL);
885 omap_writew(cpu_is_omap730() ? 0x3005 : 0x1005, ARM_CKCTL);
886 ck_dpll1.rate = 60000000;
889 propagate_rate(&ck_dpll1);
890 /* Cache rates for clocks connected to ck_ref (not dpll1) */
891 propagate_rate(&ck_ref);
892 printk(KERN_INFO "Clocking rate (xtal/DPLL1/MPU): "
893 "%ld.%01ld/%ld.%01ld/%ld.%01ld MHz\n",
894 ck_ref.rate / 1000000, (ck_ref.rate / 100000) % 10,
895 ck_dpll1.rate / 1000000, (ck_dpll1.rate / 100000) % 10,
896 arm_ck.rate / 1000000, (arm_ck.rate / 100000) % 10);
898 #if defined(CONFIG_MACH_OMAP_PERSEUS2) || defined(CONFIG_MACH_OMAP_FSAMPLE)
899 /* Select slicer output as OMAP input clock */
900 omap_writew(omap_readw(OMAP730_PCC_UPLD_CTRL) & ~0x1, OMAP730_PCC_UPLD_CTRL);
903 /* Amstrad Delta wants BCLK high when inactive */
904 if (machine_is_ams_delta())
905 omap_writel(omap_readl(ULPD_CLOCK_CTRL) |
906 (1 << SDW_MCLK_INV_BIT),
909 /* Turn off DSP and ARM_TIMXO. Make sure ARM_INTHCK is not divided */
910 /* (on 730, bit 13 must not be cleared) */
911 if (cpu_is_omap730())
912 omap_writew(omap_readw(ARM_CKCTL) & 0x2fff, ARM_CKCTL);
914 omap_writew(omap_readw(ARM_CKCTL) & 0x0fff, ARM_CKCTL);
916 /* Put DSP/MPUI into reset until needed */
917 omap_writew(0, ARM_RSTCT1);
918 omap_writew(1, ARM_RSTCT2);
919 omap_writew(0x400, ARM_IDLECT1);
922 * According to OMAP5910 Erratum SYS_DMA_1, bit DMACK_REQ (bit 8)
923 * of the ARM_IDLECT2 register must be set to zero. The power-on
924 * default value of this bit is one.
926 omap_writew(0x0000, ARM_IDLECT2); /* Turn LCD clock off also */
929 * Only enable those clocks we will need, let the drivers
930 * enable other clocks as necessary
932 clk_enable(&armper_ck.clk);
933 clk_enable(&armxor_ck.clk);
934 clk_enable(&armtim_ck.clk); /* This should be done by timer code */
936 if (cpu_is_omap15xx())
937 clk_enable(&arm_gpio_ck);