1 /* linux/arch/arm/plat-s3c64xx/s3c6400-clock.c
3 * Copyright 2008 Openmoko, Inc.
4 * Copyright 2008 Simtec Electronics
5 * Ben Dooks <ben@simtec.co.uk>
6 * http://armlinux.simtec.co.uk/
8 * S3C6400 based common clock support
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.
15 #include <linux/init.h>
16 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/list.h>
19 #include <linux/errno.h>
20 #include <linux/err.h>
21 #include <linux/clk.h>
22 #include <linux/sysdev.h>
25 #include <mach/hardware.h>
28 #include <plat/cpu-freq.h>
30 #include <plat/regs-clock.h>
31 #include <plat/clock.h>
35 /* fin_apll, fin_mpll and fin_epll are all the same clock, which we call
36 * ext_xtal_mux for want of an actual name from the manual.
39 static struct clk clk_ext_xtal_mux = {
44 #define clk_fin_apll clk_ext_xtal_mux
45 #define clk_fin_mpll clk_ext_xtal_mux
46 #define clk_fin_epll clk_ext_xtal_mux
48 #define clk_fout_mpll clk_mpll
51 unsigned int nr_sources;
60 struct clk_sources *sources;
62 unsigned int divider_shift;
63 void __iomem *reg_divider;
66 static struct clk clk_fout_apll = {
71 static struct clk *clk_src_apll_list[] = {
76 static struct clk_sources clk_src_apll = {
77 .sources = clk_src_apll_list,
78 .nr_sources = ARRAY_SIZE(clk_src_apll_list),
81 static struct clksrc_clk clk_mout_apll = {
86 .shift = S3C6400_CLKSRC_APLL_MOUT_SHIFT,
87 .mask = S3C6400_CLKSRC_APLL_MOUT,
88 .sources = &clk_src_apll,
91 static struct clk clk_fout_epll = {
96 static struct clk *clk_src_epll_list[] = {
101 static struct clk_sources clk_src_epll = {
102 .sources = clk_src_epll_list,
103 .nr_sources = ARRAY_SIZE(clk_src_epll_list),
106 static struct clksrc_clk clk_mout_epll = {
111 .shift = S3C6400_CLKSRC_EPLL_MOUT_SHIFT,
112 .mask = S3C6400_CLKSRC_EPLL_MOUT,
113 .sources = &clk_src_epll,
116 static struct clk *clk_src_mpll_list[] = {
118 [1] = &clk_fout_mpll,
121 static struct clk_sources clk_src_mpll = {
122 .sources = clk_src_mpll_list,
123 .nr_sources = ARRAY_SIZE(clk_src_mpll_list),
126 static struct clksrc_clk clk_mout_mpll = {
131 .shift = S3C6400_CLKSRC_MPLL_MOUT_SHIFT,
132 .mask = S3C6400_CLKSRC_MPLL_MOUT,
133 .sources = &clk_src_mpll,
136 static unsigned int armclk_mask;
138 static unsigned long s3c64xx_clk_arm_get_rate(struct clk *clk)
140 unsigned long rate = clk_get_rate(clk->parent);
143 /* divisor mask starts at bit0, so no need to shift */
144 clkdiv = __raw_readl(S3C_CLK_DIV0) & armclk_mask;
146 return rate / (clkdiv + 1);
149 static unsigned long s3c64xx_clk_arm_round_rate(struct clk *clk,
152 unsigned long parent = clk_get_rate(clk->parent);
158 div = (parent / rate) - 1;
159 if (div > armclk_mask)
162 return parent / (div + 1);
165 static int s3c64xx_clk_arm_set_rate(struct clk *clk, unsigned long rate)
167 unsigned long parent = clk_get_rate(clk->parent);
171 if (rate < parent / (armclk_mask + 1))
174 rate = clk_round_rate(clk, rate);
175 div = clk_get_rate(clk->parent) / rate;
177 val = __raw_readl(S3C_CLK_DIV0);
180 __raw_writel(val, S3C_CLK_DIV0);
186 static struct clk clk_arm = {
189 .parent = &clk_mout_apll.clk,
190 .get_rate = s3c64xx_clk_arm_get_rate,
191 .set_rate = s3c64xx_clk_arm_set_rate,
192 .round_rate = s3c64xx_clk_arm_round_rate,
195 static unsigned long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
197 unsigned long rate = clk_get_rate(clk->parent);
199 printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);
201 if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
207 static struct clk clk_dout_mpll = {
210 .parent = &clk_mout_mpll.clk,
211 .get_rate = s3c64xx_clk_doutmpll_get_rate,
214 static struct clk *clkset_spi_mmc_list[] = {
221 static struct clk_sources clkset_spi_mmc = {
222 .sources = clkset_spi_mmc_list,
223 .nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
226 static struct clk *clkset_irda_list[] = {
233 static struct clk_sources clkset_irda = {
234 .sources = clkset_irda_list,
235 .nr_sources = ARRAY_SIZE(clkset_irda_list),
238 static struct clk *clkset_uart_list[] = {
245 static struct clk_sources clkset_uart = {
246 .sources = clkset_uart_list,
247 .nr_sources = ARRAY_SIZE(clkset_uart_list),
250 static struct clk *clkset_uhost_list[] = {
257 static struct clk_sources clkset_uhost = {
258 .sources = clkset_uhost_list,
259 .nr_sources = ARRAY_SIZE(clkset_uhost_list),
263 /* The peripheral clocks are all controlled via clocksource followed
264 * by an optional divider and gate stage. We currently roll this into
265 * one clock which hides the intermediate clock from the mux.
267 * Note, the JPEG clock can only be an even divider...
269 * The scaler and LCD clocks depend on the S3C64XX version, and also
270 * have a common parent divisor so are not included here.
273 static inline struct clksrc_clk *to_clksrc(struct clk *clk)
275 return container_of(clk, struct clksrc_clk, clk);
278 static unsigned long s3c64xx_getrate_clksrc(struct clk *clk)
280 struct clksrc_clk *sclk = to_clksrc(clk);
281 unsigned long rate = clk_get_rate(clk->parent);
282 u32 clkdiv = __raw_readl(sclk->reg_divider);
284 clkdiv >>= sclk->divider_shift;
292 static int s3c64xx_setrate_clksrc(struct clk *clk, unsigned long rate)
294 struct clksrc_clk *sclk = to_clksrc(clk);
295 void __iomem *reg = sclk->reg_divider;
299 rate = clk_round_rate(clk, rate);
300 div = clk_get_rate(clk->parent) / rate;
304 val = __raw_readl(reg);
305 val &= ~(0xf << sclk->shift);
306 val |= (div - 1) << sclk->shift;
307 __raw_writel(val, reg);
312 static int s3c64xx_setparent_clksrc(struct clk *clk, struct clk *parent)
314 struct clksrc_clk *sclk = to_clksrc(clk);
315 struct clk_sources *srcs = sclk->sources;
316 u32 clksrc = __raw_readl(S3C_CLK_SRC);
320 for (ptr = 0; ptr < srcs->nr_sources; ptr++)
321 if (srcs->sources[ptr] == parent) {
327 clksrc &= ~sclk->mask;
328 clksrc |= src_nr << sclk->shift;
330 __raw_writel(clksrc, S3C_CLK_SRC);
337 static unsigned long s3c64xx_roundrate_clksrc(struct clk *clk,
340 unsigned long parent_rate = clk_get_rate(clk->parent);
343 if (rate > parent_rate)
346 div = rate / parent_rate;
353 rate = parent_rate / div;
359 static struct clksrc_clk clk_mmc0 = {
363 .ctrlbit = S3C_CLKCON_SCLK_MMC0,
364 .enable = s3c64xx_sclk_ctrl,
365 .set_parent = s3c64xx_setparent_clksrc,
366 .get_rate = s3c64xx_getrate_clksrc,
367 .set_rate = s3c64xx_setrate_clksrc,
368 .round_rate = s3c64xx_roundrate_clksrc,
370 .shift = S3C6400_CLKSRC_MMC0_SHIFT,
371 .mask = S3C6400_CLKSRC_MMC0_MASK,
372 .sources = &clkset_spi_mmc,
373 .divider_shift = S3C6400_CLKDIV1_MMC0_SHIFT,
374 .reg_divider = S3C_CLK_DIV1,
377 static struct clksrc_clk clk_mmc1 = {
381 .ctrlbit = S3C_CLKCON_SCLK_MMC1,
382 .enable = s3c64xx_sclk_ctrl,
383 .get_rate = s3c64xx_getrate_clksrc,
384 .set_rate = s3c64xx_setrate_clksrc,
385 .set_parent = s3c64xx_setparent_clksrc,
386 .round_rate = s3c64xx_roundrate_clksrc,
388 .shift = S3C6400_CLKSRC_MMC1_SHIFT,
389 .mask = S3C6400_CLKSRC_MMC1_MASK,
390 .sources = &clkset_spi_mmc,
391 .divider_shift = S3C6400_CLKDIV1_MMC1_SHIFT,
392 .reg_divider = S3C_CLK_DIV1,
395 static struct clksrc_clk clk_mmc2 = {
399 .ctrlbit = S3C_CLKCON_SCLK_MMC2,
400 .enable = s3c64xx_sclk_ctrl,
401 .get_rate = s3c64xx_getrate_clksrc,
402 .set_rate = s3c64xx_setrate_clksrc,
403 .set_parent = s3c64xx_setparent_clksrc,
404 .round_rate = s3c64xx_roundrate_clksrc,
406 .shift = S3C6400_CLKSRC_MMC2_SHIFT,
407 .mask = S3C6400_CLKSRC_MMC2_MASK,
408 .sources = &clkset_spi_mmc,
409 .divider_shift = S3C6400_CLKDIV1_MMC2_SHIFT,
410 .reg_divider = S3C_CLK_DIV1,
413 static struct clksrc_clk clk_usbhost = {
415 .name = "usb-bus-host",
417 .ctrlbit = S3C_CLKCON_SCLK_UHOST,
418 .enable = s3c64xx_sclk_ctrl,
419 .set_parent = s3c64xx_setparent_clksrc,
420 .get_rate = s3c64xx_getrate_clksrc,
421 .set_rate = s3c64xx_setrate_clksrc,
422 .round_rate = s3c64xx_roundrate_clksrc,
424 .shift = S3C6400_CLKSRC_UHOST_SHIFT,
425 .mask = S3C6400_CLKSRC_UHOST_MASK,
426 .sources = &clkset_uhost,
427 .divider_shift = S3C6400_CLKDIV1_UHOST_SHIFT,
428 .reg_divider = S3C_CLK_DIV1,
431 static struct clksrc_clk clk_uart_uclk1 = {
435 .ctrlbit = S3C_CLKCON_SCLK_UART,
436 .enable = s3c64xx_sclk_ctrl,
437 .set_parent = s3c64xx_setparent_clksrc,
438 .get_rate = s3c64xx_getrate_clksrc,
439 .set_rate = s3c64xx_setrate_clksrc,
440 .round_rate = s3c64xx_roundrate_clksrc,
442 .shift = S3C6400_CLKSRC_UART_SHIFT,
443 .mask = S3C6400_CLKSRC_UART_MASK,
444 .sources = &clkset_uart,
445 .divider_shift = S3C6400_CLKDIV2_UART_SHIFT,
446 .reg_divider = S3C_CLK_DIV2,
449 /* Where does UCLK0 come from? */
451 static struct clksrc_clk clk_spi0 = {
455 .ctrlbit = S3C_CLKCON_SCLK_SPI0,
456 .enable = s3c64xx_sclk_ctrl,
457 .set_parent = s3c64xx_setparent_clksrc,
458 .get_rate = s3c64xx_getrate_clksrc,
459 .set_rate = s3c64xx_setrate_clksrc,
460 .round_rate = s3c64xx_roundrate_clksrc,
462 .shift = S3C6400_CLKSRC_SPI0_SHIFT,
463 .mask = S3C6400_CLKSRC_SPI0_MASK,
464 .sources = &clkset_spi_mmc,
465 .divider_shift = S3C6400_CLKDIV2_SPI0_SHIFT,
466 .reg_divider = S3C_CLK_DIV2,
469 static struct clksrc_clk clk_spi1 = {
473 .ctrlbit = S3C_CLKCON_SCLK_SPI1,
474 .enable = s3c64xx_sclk_ctrl,
475 .set_parent = s3c64xx_setparent_clksrc,
476 .get_rate = s3c64xx_getrate_clksrc,
477 .set_rate = s3c64xx_setrate_clksrc,
478 .round_rate = s3c64xx_roundrate_clksrc,
480 .shift = S3C6400_CLKSRC_SPI1_SHIFT,
481 .mask = S3C6400_CLKSRC_SPI1_MASK,
482 .sources = &clkset_spi_mmc,
483 .divider_shift = S3C6400_CLKDIV2_SPI1_SHIFT,
484 .reg_divider = S3C_CLK_DIV2,
487 static struct clk clk_iis_cd0 = {
488 .name = "iis_cdclk0",
492 static struct clk clk_iis_cd1 = {
493 .name = "iis_cdclk1",
497 static struct clk clk_pcm_cd = {
502 static struct clk *clkset_audio0_list[] = {
503 [0] = &clk_mout_epll.clk,
504 [1] = &clk_dout_mpll,
510 static struct clk_sources clkset_audio0 = {
511 .sources = clkset_audio0_list,
512 .nr_sources = ARRAY_SIZE(clkset_audio0_list),
515 static struct clksrc_clk clk_audio0 = {
519 .ctrlbit = S3C_CLKCON_SCLK_AUDIO0,
520 .enable = s3c64xx_sclk_ctrl,
521 .set_parent = s3c64xx_setparent_clksrc,
522 .get_rate = s3c64xx_getrate_clksrc,
523 .set_rate = s3c64xx_setrate_clksrc,
524 .round_rate = s3c64xx_roundrate_clksrc,
526 .shift = S3C6400_CLKSRC_AUDIO0_SHIFT,
527 .mask = S3C6400_CLKSRC_AUDIO0_MASK,
528 .sources = &clkset_audio0,
529 .divider_shift = S3C6400_CLKDIV2_AUDIO0_SHIFT,
530 .reg_divider = S3C_CLK_DIV2,
533 static struct clk *clkset_audio1_list[] = {
534 [0] = &clk_mout_epll.clk,
535 [1] = &clk_dout_mpll,
541 static struct clk_sources clkset_audio1 = {
542 .sources = clkset_audio1_list,
543 .nr_sources = ARRAY_SIZE(clkset_audio1_list),
546 static struct clksrc_clk clk_audio1 = {
550 .ctrlbit = S3C_CLKCON_SCLK_AUDIO1,
551 .enable = s3c64xx_sclk_ctrl,
552 .set_parent = s3c64xx_setparent_clksrc,
553 .get_rate = s3c64xx_getrate_clksrc,
554 .set_rate = s3c64xx_setrate_clksrc,
555 .round_rate = s3c64xx_roundrate_clksrc,
557 .shift = S3C6400_CLKSRC_AUDIO1_SHIFT,
558 .mask = S3C6400_CLKSRC_AUDIO1_MASK,
559 .sources = &clkset_audio1,
560 .divider_shift = S3C6400_CLKDIV2_AUDIO1_SHIFT,
561 .reg_divider = S3C_CLK_DIV2,
564 static struct clksrc_clk clk_irda = {
568 .ctrlbit = S3C_CLKCON_SCLK_IRDA,
569 .enable = s3c64xx_sclk_ctrl,
570 .set_parent = s3c64xx_setparent_clksrc,
571 .get_rate = s3c64xx_getrate_clksrc,
572 .set_rate = s3c64xx_setrate_clksrc,
573 .round_rate = s3c64xx_roundrate_clksrc,
575 .shift = S3C6400_CLKSRC_IRDA_SHIFT,
576 .mask = S3C6400_CLKSRC_IRDA_MASK,
577 .sources = &clkset_irda,
578 .divider_shift = S3C6400_CLKDIV2_IRDA_SHIFT,
579 .reg_divider = S3C_CLK_DIV2,
582 static struct clk *clkset_camif_list[] = {
586 static struct clk_sources clkset_camif = {
587 .sources = clkset_camif_list,
588 .nr_sources = ARRAY_SIZE(clkset_camif_list),
591 static struct clksrc_clk clk_camif = {
595 .ctrlbit = S3C_CLKCON_SCLK_CAM,
596 .enable = s3c64xx_sclk_ctrl,
597 .set_parent = s3c64xx_setparent_clksrc,
598 .get_rate = s3c64xx_getrate_clksrc,
599 .set_rate = s3c64xx_setrate_clksrc,
600 .round_rate = s3c64xx_roundrate_clksrc,
604 .sources = &clkset_camif,
605 .divider_shift = S3C6400_CLKDIV0_CAM_SHIFT,
606 .reg_divider = S3C_CLK_DIV0,
609 /* Clock initialisation code */
611 static struct clksrc_clk *init_parents[] = {
628 static void __init_or_cpufreq s3c6400_set_clksrc(struct clksrc_clk *clk)
630 struct clk_sources *srcs = clk->sources;
631 u32 clksrc = __raw_readl(S3C_CLK_SRC);
634 clksrc >>= clk->shift;
636 if (clksrc > srcs->nr_sources || !srcs->sources[clksrc]) {
637 printk(KERN_ERR "%s: bad source %d\n",
638 clk->clk.name, clksrc);
642 clk->clk.parent = srcs->sources[clksrc];
644 printk(KERN_INFO "%s: source is %s (%d), rate is %ld\n",
645 clk->clk.name, clk->clk.parent->name, clksrc,
646 clk_get_rate(&clk->clk));
649 #define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)
651 void __init_or_cpufreq s3c6400_setup_clocks(void)
653 struct clk *xtal_clk;
665 printk(KERN_DEBUG "%s: registering clocks\n", __func__);
667 clkdiv0 = __raw_readl(S3C_CLK_DIV0);
668 printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);
670 xtal_clk = clk_get(NULL, "xtal");
671 BUG_ON(IS_ERR(xtal_clk));
673 xtal = clk_get_rate(xtal_clk);
676 printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
678 epll = s3c6400_get_epll(xtal);
679 mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
680 apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));
684 printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
687 hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
688 hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
689 pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);
691 printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
694 clk_fout_mpll.rate = mpll;
695 clk_fout_epll.rate = epll;
696 clk_fout_apll.rate = apll;
703 for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
704 s3c6400_set_clksrc(init_parents[ptr]);
707 static struct clk *clks[] __initdata = {
731 * s3c6400_register_clocks - register clocks for s3c6400 and above
732 * @armclk_divlimit: Divisor mask for ARMCLK
734 * Register the clocks for the S3C6400 and above SoC range, such
735 * as ARMCLK and the clocks which have divider chains attached.
737 * This call does not setup the clocks, which is left to the
738 * s3c6400_setup_clocks() call which may be needed by the cpufreq
739 * or resume code to re-set the clocks if the bootloader has changed
742 void __init s3c6400_register_clocks(unsigned armclk_divlimit)
748 armclk_mask = armclk_divlimit;
750 for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
752 ret = s3c24xx_register_clock(clkp);
754 printk(KERN_ERR "Failed to register clock %s (%d)\n",
759 clk_mpll.parent = &clk_mout_mpll.clk;
760 clk_epll.parent = &clk_mout_epll.clk;