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 long s3c64xx_clk_doutmpll_get_rate(struct clk *clk)
138 unsigned long rate = clk_get_rate(clk->parent);
140 printk(KERN_DEBUG "%s: parent is %ld\n", __func__, rate);
142 if (__raw_readl(S3C_CLK_DIV0) & S3C6400_CLKDIV0_MPLL_MASK)
148 static struct clk clk_dout_mpll = {
151 .parent = &clk_mout_mpll.clk,
152 .get_rate = s3c64xx_clk_doutmpll_get_rate,
155 static struct clk *clkset_spi_mmc_list[] = {
162 static struct clk_sources clkset_spi_mmc = {
163 .sources = clkset_spi_mmc_list,
164 .nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
167 static struct clk *clkset_irda_list[] = {
174 static struct clk_sources clkset_irda = {
175 .sources = clkset_irda_list,
176 .nr_sources = ARRAY_SIZE(clkset_irda_list),
179 static struct clk *clkset_uart_list[] = {
186 static struct clk_sources clkset_uart = {
187 .sources = clkset_uart_list,
188 .nr_sources = ARRAY_SIZE(clkset_uart_list),
191 static struct clk *clkset_uhost_list[] = {
198 static struct clk_sources clkset_uhost = {
199 .sources = clkset_uhost_list,
200 .nr_sources = ARRAY_SIZE(clkset_uhost_list),
204 /* The peripheral clocks are all controlled via clocksource followed
205 * by an optional divider and gate stage. We currently roll this into
206 * one clock which hides the intermediate clock from the mux.
208 * Note, the JPEG clock can only be an even divider...
210 * The scaler and LCD clocks depend on the S3C64XX version, and also
211 * have a common parent divisor so are not included here.
214 static inline struct clksrc_clk *to_clksrc(struct clk *clk)
216 return container_of(clk, struct clksrc_clk, clk);
219 static unsigned long s3c64xx_getrate_clksrc(struct clk *clk)
221 struct clksrc_clk *sclk = to_clksrc(clk);
222 unsigned long rate = clk_get_rate(clk->parent);
223 u32 clkdiv = __raw_readl(sclk->reg_divider);
225 clkdiv >>= sclk->divider_shift;
233 static int s3c64xx_setrate_clksrc(struct clk *clk, unsigned long rate)
235 struct clksrc_clk *sclk = to_clksrc(clk);
236 void __iomem *reg = sclk->reg_divider;
240 rate = clk_round_rate(clk, rate);
241 div = clk_get_rate(clk->parent) / rate;
245 val = __raw_readl(reg);
246 val &= ~(0xf << sclk->shift);
247 val |= (div - 1) << sclk->shift;
248 __raw_writel(val, reg);
253 static int s3c64xx_setparent_clksrc(struct clk *clk, struct clk *parent)
255 struct clksrc_clk *sclk = to_clksrc(clk);
256 struct clk_sources *srcs = sclk->sources;
257 u32 clksrc = __raw_readl(S3C_CLK_SRC);
261 for (ptr = 0; ptr < srcs->nr_sources; ptr++)
262 if (srcs->sources[ptr] == parent) {
268 clksrc &= ~sclk->mask;
269 clksrc |= src_nr << sclk->shift;
271 __raw_writel(clksrc, S3C_CLK_SRC);
278 static unsigned long s3c64xx_roundrate_clksrc(struct clk *clk,
281 unsigned long parent_rate = clk_get_rate(clk->parent);
284 if (rate > parent_rate)
287 div = rate / parent_rate;
294 rate = parent_rate / div;
300 static struct clksrc_clk clk_mmc0 = {
304 .ctrlbit = S3C_CLKCON_SCLK_MMC0,
305 .enable = s3c64xx_sclk_ctrl,
306 .set_parent = s3c64xx_setparent_clksrc,
307 .get_rate = s3c64xx_getrate_clksrc,
308 .set_rate = s3c64xx_setrate_clksrc,
309 .round_rate = s3c64xx_roundrate_clksrc,
311 .shift = S3C6400_CLKSRC_MMC0_SHIFT,
312 .mask = S3C6400_CLKSRC_MMC0_MASK,
313 .sources = &clkset_spi_mmc,
314 .divider_shift = S3C6400_CLKDIV1_MMC0_SHIFT,
315 .reg_divider = S3C_CLK_DIV1,
318 static struct clksrc_clk clk_mmc1 = {
322 .ctrlbit = S3C_CLKCON_SCLK_MMC1,
323 .enable = s3c64xx_sclk_ctrl,
324 .get_rate = s3c64xx_getrate_clksrc,
325 .set_rate = s3c64xx_setrate_clksrc,
326 .set_parent = s3c64xx_setparent_clksrc,
327 .round_rate = s3c64xx_roundrate_clksrc,
329 .shift = S3C6400_CLKSRC_MMC1_SHIFT,
330 .mask = S3C6400_CLKSRC_MMC1_MASK,
331 .sources = &clkset_spi_mmc,
332 .divider_shift = S3C6400_CLKDIV1_MMC1_SHIFT,
333 .reg_divider = S3C_CLK_DIV1,
336 static struct clksrc_clk clk_mmc2 = {
340 .ctrlbit = S3C_CLKCON_SCLK_MMC2,
341 .enable = s3c64xx_sclk_ctrl,
342 .get_rate = s3c64xx_getrate_clksrc,
343 .set_rate = s3c64xx_setrate_clksrc,
344 .set_parent = s3c64xx_setparent_clksrc,
345 .round_rate = s3c64xx_roundrate_clksrc,
347 .shift = S3C6400_CLKSRC_MMC2_SHIFT,
348 .mask = S3C6400_CLKSRC_MMC2_MASK,
349 .sources = &clkset_spi_mmc,
350 .divider_shift = S3C6400_CLKDIV1_MMC2_SHIFT,
351 .reg_divider = S3C_CLK_DIV1,
354 static struct clksrc_clk clk_usbhost = {
356 .name = "usb-bus-host",
358 .ctrlbit = S3C_CLKCON_SCLK_UHOST,
359 .enable = s3c64xx_sclk_ctrl,
360 .set_parent = s3c64xx_setparent_clksrc,
361 .get_rate = s3c64xx_getrate_clksrc,
362 .set_rate = s3c64xx_setrate_clksrc,
363 .round_rate = s3c64xx_roundrate_clksrc,
365 .shift = S3C6400_CLKSRC_UHOST_SHIFT,
366 .mask = S3C6400_CLKSRC_UHOST_MASK,
367 .sources = &clkset_uhost,
368 .divider_shift = S3C6400_CLKDIV1_UHOST_SHIFT,
369 .reg_divider = S3C_CLK_DIV1,
372 static struct clksrc_clk clk_uart_uclk1 = {
376 .ctrlbit = S3C_CLKCON_SCLK_UART,
377 .enable = s3c64xx_sclk_ctrl,
378 .set_parent = s3c64xx_setparent_clksrc,
379 .get_rate = s3c64xx_getrate_clksrc,
380 .set_rate = s3c64xx_setrate_clksrc,
381 .round_rate = s3c64xx_roundrate_clksrc,
383 .shift = S3C6400_CLKSRC_UART_SHIFT,
384 .mask = S3C6400_CLKSRC_UART_MASK,
385 .sources = &clkset_uart,
386 .divider_shift = S3C6400_CLKDIV2_UART_SHIFT,
387 .reg_divider = S3C_CLK_DIV2,
390 /* Where does UCLK0 come from? */
392 static struct clksrc_clk clk_spi0 = {
396 .ctrlbit = S3C_CLKCON_SCLK_SPI0,
397 .enable = s3c64xx_sclk_ctrl,
398 .set_parent = s3c64xx_setparent_clksrc,
399 .get_rate = s3c64xx_getrate_clksrc,
400 .set_rate = s3c64xx_setrate_clksrc,
401 .round_rate = s3c64xx_roundrate_clksrc,
403 .shift = S3C6400_CLKSRC_SPI0_SHIFT,
404 .mask = S3C6400_CLKSRC_SPI0_MASK,
405 .sources = &clkset_spi_mmc,
406 .divider_shift = S3C6400_CLKDIV2_SPI0_SHIFT,
407 .reg_divider = S3C_CLK_DIV2,
410 static struct clksrc_clk clk_spi1 = {
414 .ctrlbit = S3C_CLKCON_SCLK_SPI1,
415 .enable = s3c64xx_sclk_ctrl,
416 .set_parent = s3c64xx_setparent_clksrc,
417 .get_rate = s3c64xx_getrate_clksrc,
418 .set_rate = s3c64xx_setrate_clksrc,
419 .round_rate = s3c64xx_roundrate_clksrc,
421 .shift = S3C6400_CLKSRC_SPI1_SHIFT,
422 .mask = S3C6400_CLKSRC_SPI1_MASK,
423 .sources = &clkset_spi_mmc,
424 .divider_shift = S3C6400_CLKDIV2_SPI1_SHIFT,
425 .reg_divider = S3C_CLK_DIV2,
428 static struct clk clk_iis_cd0 = {
429 .name = "iis_cdclk0",
433 static struct clk clk_iis_cd1 = {
434 .name = "iis_cdclk1",
438 static struct clk clk_pcm_cd = {
443 static struct clk *clkset_audio0_list[] = {
444 [0] = &clk_mout_epll.clk,
445 [1] = &clk_dout_mpll,
451 static struct clk_sources clkset_audio0 = {
452 .sources = clkset_audio0_list,
453 .nr_sources = ARRAY_SIZE(clkset_audio0_list),
456 static struct clksrc_clk clk_audio0 = {
460 .ctrlbit = S3C_CLKCON_SCLK_AUDIO0,
461 .enable = s3c64xx_sclk_ctrl,
462 .set_parent = s3c64xx_setparent_clksrc,
463 .get_rate = s3c64xx_getrate_clksrc,
464 .set_rate = s3c64xx_setrate_clksrc,
465 .round_rate = s3c64xx_roundrate_clksrc,
467 .shift = S3C6400_CLKSRC_AUDIO0_SHIFT,
468 .mask = S3C6400_CLKSRC_AUDIO0_MASK,
469 .sources = &clkset_audio0,
470 .divider_shift = S3C6400_CLKDIV2_AUDIO0_SHIFT,
471 .reg_divider = S3C_CLK_DIV2,
474 static struct clk *clkset_audio1_list[] = {
475 [0] = &clk_mout_epll.clk,
476 [1] = &clk_dout_mpll,
482 static struct clk_sources clkset_audio1 = {
483 .sources = clkset_audio1_list,
484 .nr_sources = ARRAY_SIZE(clkset_audio1_list),
487 static struct clksrc_clk clk_audio1 = {
491 .ctrlbit = S3C_CLKCON_SCLK_AUDIO1,
492 .enable = s3c64xx_sclk_ctrl,
493 .set_parent = s3c64xx_setparent_clksrc,
494 .get_rate = s3c64xx_getrate_clksrc,
495 .set_rate = s3c64xx_setrate_clksrc,
496 .round_rate = s3c64xx_roundrate_clksrc,
498 .shift = S3C6400_CLKSRC_AUDIO1_SHIFT,
499 .mask = S3C6400_CLKSRC_AUDIO1_MASK,
500 .sources = &clkset_audio1,
501 .divider_shift = S3C6400_CLKDIV2_AUDIO1_SHIFT,
502 .reg_divider = S3C_CLK_DIV2,
505 static struct clksrc_clk clk_irda = {
509 .ctrlbit = S3C_CLKCON_SCLK_IRDA,
510 .enable = s3c64xx_sclk_ctrl,
511 .set_parent = s3c64xx_setparent_clksrc,
512 .get_rate = s3c64xx_getrate_clksrc,
513 .set_rate = s3c64xx_setrate_clksrc,
514 .round_rate = s3c64xx_roundrate_clksrc,
516 .shift = S3C6400_CLKSRC_IRDA_SHIFT,
517 .mask = S3C6400_CLKSRC_IRDA_MASK,
518 .sources = &clkset_irda,
519 .divider_shift = S3C6400_CLKDIV2_IRDA_SHIFT,
520 .reg_divider = S3C_CLK_DIV2,
523 /* Clock initialisation code */
525 static struct clksrc_clk *init_parents[] = {
541 static void __init_or_cpufreq s3c6400_set_clksrc(struct clksrc_clk *clk)
543 struct clk_sources *srcs = clk->sources;
544 u32 clksrc = __raw_readl(S3C_CLK_SRC);
547 clksrc >>= clk->shift;
549 if (clksrc > srcs->nr_sources || !srcs->sources[clksrc]) {
550 printk(KERN_ERR "%s: bad source %d\n",
551 clk->clk.name, clksrc);
555 clk->clk.parent = srcs->sources[clksrc];
557 printk(KERN_INFO "%s: source is %s (%d), rate is %ld\n",
558 clk->clk.name, clk->clk.parent->name, clksrc,
559 clk_get_rate(&clk->clk));
562 #define GET_DIV(clk, field) ((((clk) & field##_MASK) >> field##_SHIFT) + 1)
564 void __init_or_cpufreq s3c6400_setup_clocks(void)
566 struct clk *xtal_clk;
578 printk(KERN_DEBUG "%s: registering clocks\n", __func__);
580 clkdiv0 = __raw_readl(S3C_CLK_DIV0);
581 printk(KERN_DEBUG "%s: clkdiv0 = %08x\n", __func__, clkdiv0);
583 xtal_clk = clk_get(NULL, "xtal");
584 BUG_ON(IS_ERR(xtal_clk));
586 xtal = clk_get_rate(xtal_clk);
589 printk(KERN_DEBUG "%s: xtal is %ld\n", __func__, xtal);
591 epll = s3c6400_get_epll(xtal);
592 mpll = s3c6400_get_pll(xtal, __raw_readl(S3C_MPLL_CON));
593 apll = s3c6400_get_pll(xtal, __raw_readl(S3C_APLL_CON));
597 printk(KERN_INFO "S3C64XX: PLL settings, A=%ld, M=%ld, E=%ld\n",
600 hclk2 = mpll / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK2);
601 hclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_HCLK);
602 pclk = hclk2 / GET_DIV(clkdiv0, S3C6400_CLKDIV0_PCLK);
604 printk(KERN_INFO "S3C64XX: HCLK2=%ld, HCLK=%ld, PCLK=%ld\n",
607 clk_fout_mpll.rate = mpll;
608 clk_fout_epll.rate = epll;
609 clk_fout_apll.rate = apll;
615 for (ptr = 0; ptr < ARRAY_SIZE(init_parents); ptr++)
616 s3c6400_set_clksrc(init_parents[ptr]);
619 static struct clk *clks[] __initdata = {
640 void __init s3c6400_register_clocks(void)
646 for (ptr = 0; ptr < ARRAY_SIZE(clks); ptr++) {
648 ret = s3c24xx_register_clock(clkp);
650 printk(KERN_ERR "Failed to register clock %s (%d)\n",
655 clk_mpll.parent = &clk_mout_mpll.clk;
656 clk_epll.parent = &clk_mout_epll.clk;