1 /* linux/arch/arm/mach-s5p6440/clock.c
3 * Copyright (c) 2009 Samsung Electronics Co., Ltd.
4 * http://www.samsung.com/
6 * S5P6440 - Clock support
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
13 #include <linux/init.h>
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>
20 #include <linux/sysdev.h>
23 #include <mach/hardware.h>
26 #include <plat/cpu-freq.h>
27 #include <mach/regs-clock.h>
28 #include <plat/clock.h>
30 #include <plat/clock-clksrc.h>
31 #include <plat/s5p-clock.h>
33 #include <plat/s5p6440.h>
35 /* APLL Mux output clock */
36 static struct clksrc_clk clk_mout_apll = {
41 .sources = &clk_src_apll,
42 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 0, .size = 1 },
45 static int s5p6440_epll_enable(struct clk *clk, int enable)
47 unsigned int ctrlbit = clk->ctrlbit;
48 unsigned int epll_con = __raw_readl(S5P_EPLL_CON) & ~ctrlbit;
51 __raw_writel(epll_con | ctrlbit, S5P_EPLL_CON);
53 __raw_writel(epll_con, S5P_EPLL_CON);
58 static unsigned long s5p6440_epll_get_rate(struct clk *clk)
63 static u32 epll_div[][5] = {
64 { 36000000, 0, 48, 1, 4 },
65 { 48000000, 0, 32, 1, 3 },
66 { 60000000, 0, 40, 1, 3 },
67 { 72000000, 0, 48, 1, 3 },
68 { 84000000, 0, 28, 1, 2 },
69 { 96000000, 0, 32, 1, 2 },
70 { 32768000, 45264, 43, 1, 4 },
71 { 45158000, 6903, 30, 1, 3 },
72 { 49152000, 50332, 32, 1, 3 },
73 { 67738000, 10398, 45, 1, 3 },
74 { 73728000, 9961, 49, 1, 3 }
77 static int s5p6440_epll_set_rate(struct clk *clk, unsigned long rate)
79 unsigned int epll_con, epll_con_k;
82 if (clk->rate == rate) /* Return if nothing changed */
85 epll_con = __raw_readl(S5P_EPLL_CON);
86 epll_con_k = __raw_readl(S5P_EPLL_CON_K);
88 epll_con_k &= ~(PLL90XX_KDIV_MASK);
89 epll_con &= ~(PLL90XX_MDIV_MASK | PLL90XX_PDIV_MASK | PLL90XX_SDIV_MASK);
91 for (i = 0; i < ARRAY_SIZE(epll_div); i++) {
92 if (epll_div[i][0] == rate) {
93 epll_con_k |= (epll_div[i][1] << PLL90XX_KDIV_SHIFT);
94 epll_con |= (epll_div[i][2] << PLL90XX_MDIV_SHIFT) |
95 (epll_div[i][3] << PLL90XX_PDIV_SHIFT) |
96 (epll_div[i][4] << PLL90XX_SDIV_SHIFT);
101 if (i == ARRAY_SIZE(epll_div)) {
102 printk(KERN_ERR "%s: Invalid Clock EPLL Frequency\n", __func__);
106 __raw_writel(epll_con, S5P_EPLL_CON);
107 __raw_writel(epll_con_k, S5P_EPLL_CON_K);
114 static struct clk_ops s5p6440_epll_ops = {
115 .get_rate = s5p6440_epll_get_rate,
116 .set_rate = s5p6440_epll_set_rate,
119 static struct clksrc_clk clk_mout_epll = {
124 .sources = &clk_src_epll,
125 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 2, .size = 1 },
128 static struct clksrc_clk clk_mout_mpll = {
133 .sources = &clk_src_mpll,
134 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 1, .size = 1 },
137 static struct clk clk_h_low = {
143 .ops = &clk_ops_def_setrate,
146 static struct clk clk_p_low = {
152 .ops = &clk_ops_def_setrate,
161 static const u32 clock_table[][3] = {
162 /*{ARM_CLK, DIVarm, DIVhclk}*/
163 {L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P_CLKDIV0_HCLK_SHIFT)},
164 {L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P_CLKDIV0_HCLK_SHIFT)},
165 {L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P_CLKDIV0_HCLK_SHIFT)},
168 static unsigned long s5p6440_armclk_get_rate(struct clk *clk)
170 unsigned long rate = clk_get_rate(clk->parent);
173 /* divisor mask starts at bit0, so no need to shift */
174 clkdiv = __raw_readl(ARM_CLK_DIV) & ARM_DIV_MASK;
176 return rate / (clkdiv + 1);
179 static unsigned long s5p6440_armclk_round_rate(struct clk *clk,
184 for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
185 if (rate > clock_table[iter][0])
186 return clock_table[iter-1][0];
189 return clock_table[ARRAY_SIZE(clock_table) - 1][0];
192 static int s5p6440_armclk_set_rate(struct clk *clk, unsigned long rate)
197 u32 cur_rate = clk->ops->get_rate(clk);
200 round_tmp = clk->ops->round_rate(clk, rate);
201 if (round_tmp == cur_rate)
205 for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
206 if (round_tmp == clock_table[iter][0])
210 if (iter >= ARRAY_SIZE(clock_table))
211 iter = ARRAY_SIZE(clock_table) - 1;
213 local_irq_save(flags);
214 if (cur_rate > round_tmp) {
216 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
217 clk_div0_tmp |= clock_table[iter][1];
218 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
220 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
221 ~(S5P_CLKDIV0_HCLK_MASK);
222 clk_div0_tmp |= clock_table[iter][2];
223 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
228 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
229 ~(S5P_CLKDIV0_HCLK_MASK);
230 clk_div0_tmp |= clock_table[iter][2];
231 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
233 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
234 clk_div0_tmp |= clock_table[iter][1];
235 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
237 local_irq_restore(flags);
239 clk->rate = clock_table[iter][0];
244 static struct clk_ops s5p6440_clkarm_ops = {
245 .get_rate = s5p6440_armclk_get_rate,
246 .set_rate = s5p6440_armclk_set_rate,
247 .round_rate = s5p6440_armclk_round_rate,
250 static struct clksrc_clk clk_dout_mpll = {
254 .parent = &clk_mout_mpll.clk,
256 .reg_div = { .reg = S5P_CLK_DIV0, .shift = 4, .size = 1 },
259 int s5p6440_clk48m_ctrl(struct clk *clk, int enable)
264 /* can't rely on clock lock, this register has other usages */
265 local_irq_save(flags);
267 val = __raw_readl(S5P_OTHERS);
269 val |= S5P_OTHERS_USB_SIG_MASK;
271 val &= ~S5P_OTHERS_USB_SIG_MASK;
273 __raw_writel(val, S5P_OTHERS);
275 local_irq_restore(flags);
280 static int s5p6440_pclk_ctrl(struct clk *clk, int enable)
282 return s5p_gatectrl(S5P_CLK_GATE_PCLK, clk, enable);
285 static int s5p6440_hclk0_ctrl(struct clk *clk, int enable)
287 return s5p_gatectrl(S5P_CLK_GATE_HCLK0, clk, enable);
290 static int s5p6440_hclk1_ctrl(struct clk *clk, int enable)
292 return s5p_gatectrl(S5P_CLK_GATE_HCLK1, clk, enable);
295 static int s5p6440_sclk_ctrl(struct clk *clk, int enable)
297 return s5p_gatectrl(S5P_CLK_GATE_SCLK0, clk, enable);
300 static int s5p6440_mem_ctrl(struct clk *clk, int enable)
302 return s5p_gatectrl(S5P_CLK_GATE_MEM0, clk, enable);
306 * The following clocks will be disabled during clock initialization. It is
307 * recommended to keep the following clocks disabled until the driver requests
308 * for enabling the clock.
310 static struct clk init_clocks_disable[] = {
315 .enable = s5p6440_mem_ctrl,
316 .ctrlbit = S5P_CLKCON_MEM0_HCLK_NFCON,
320 .parent = &clk_p_low,
321 .enable = s5p6440_pclk_ctrl,
322 .ctrlbit = S5P_CLKCON_PCLK_TSADC,
326 .parent = &clk_p_low,
327 .enable = s5p6440_pclk_ctrl,
328 .ctrlbit = S5P_CLKCON_PCLK_IIC0,
332 .parent = &clk_p_low,
333 .enable = s5p6440_pclk_ctrl,
334 .ctrlbit = S5P_CLKCON_PCLK_IIS2,
338 .parent = &clk_p_low,
339 .enable = s5p6440_pclk_ctrl,
340 .ctrlbit = S5P_CLKCON_PCLK_SPI0,
344 .parent = &clk_p_low,
345 .enable = s5p6440_pclk_ctrl,
346 .ctrlbit = S5P_CLKCON_PCLK_SPI1,
348 .name = "sclk_spi_48",
351 .enable = s5p6440_sclk_ctrl,
352 .ctrlbit = S5P_CLKCON_SCLK0_SPI0_48,
354 .name = "sclk_spi_48",
357 .enable = s5p6440_sclk_ctrl,
358 .ctrlbit = S5P_CLKCON_SCLK0_SPI1_48,
363 .enable = s5p6440_sclk_ctrl,
364 .ctrlbit = S5P_CLKCON_SCLK0_MMC0_48,
369 .enable = s5p6440_sclk_ctrl,
370 .ctrlbit = S5P_CLKCON_SCLK0_MMC1_48,
375 .enable = s5p6440_sclk_ctrl,
376 .ctrlbit = S5P_CLKCON_SCLK0_MMC2_48,
380 .parent = &clk_h_low,
381 .enable = s5p6440_hclk0_ctrl,
382 .ctrlbit = S5P_CLKCON_HCLK0_USB
386 .parent = &clk_h_low,
387 .enable = s5p6440_hclk0_ctrl,
388 .ctrlbit = S5P_CLKCON_HCLK0_POST0
392 .parent = &clk_h_low,
393 .enable = s5p6440_hclk1_ctrl,
394 .ctrlbit = S5P_CLKCON_HCLK1_DISPCON,
398 .parent = &clk_h_low,
399 .enable = s5p6440_hclk0_ctrl,
400 .ctrlbit = S5P_CLKCON_HCLK0_HSMMC0,
404 .parent = &clk_h_low,
405 .enable = s5p6440_hclk0_ctrl,
406 .ctrlbit = S5P_CLKCON_HCLK0_HSMMC1,
410 .parent = &clk_h_low,
411 .enable = s5p6440_hclk0_ctrl,
412 .ctrlbit = S5P_CLKCON_HCLK0_HSMMC2,
416 .parent = &clk_p_low,
417 .enable = s5p6440_pclk_ctrl,
418 .ctrlbit = S5P_CLKCON_PCLK_RTC,
422 .parent = &clk_p_low,
423 .enable = s5p6440_pclk_ctrl,
424 .ctrlbit = S5P_CLKCON_PCLK_WDT,
428 .parent = &clk_p_low,
429 .enable = s5p6440_pclk_ctrl,
430 .ctrlbit = S5P_CLKCON_PCLK_PWM,
435 * The following clocks will be enabled during clock initialization.
437 static struct clk init_clocks[] = {
441 .parent = &clk_p_low,
442 .enable = s5p6440_pclk_ctrl,
443 .ctrlbit = S5P_CLKCON_PCLK_GPIO,
447 .parent = &clk_p_low,
448 .enable = s5p6440_pclk_ctrl,
449 .ctrlbit = S5P_CLKCON_PCLK_UART0,
453 .parent = &clk_p_low,
454 .enable = s5p6440_pclk_ctrl,
455 .ctrlbit = S5P_CLKCON_PCLK_UART1,
459 .parent = &clk_p_low,
460 .enable = s5p6440_pclk_ctrl,
461 .ctrlbit = S5P_CLKCON_PCLK_UART2,
465 .parent = &clk_p_low,
466 .enable = s5p6440_pclk_ctrl,
467 .ctrlbit = S5P_CLKCON_PCLK_UART3,
471 static struct clk clk_iis_cd_v40 = {
472 .name = "iis_cdclk_v40",
476 static struct clk clk_pcm_cd = {
481 static struct clk *clkset_spi_mmc_list[] = {
487 static struct clksrc_sources clkset_spi_mmc = {
488 .sources = clkset_spi_mmc_list,
489 .nr_sources = ARRAY_SIZE(clkset_spi_mmc_list),
492 static struct clk *clkset_uart_list[] = {
497 static struct clksrc_sources clkset_uart = {
498 .sources = clkset_uart_list,
499 .nr_sources = ARRAY_SIZE(clkset_uart_list),
502 static struct clksrc_clk clksrcs[] = {
507 .ctrlbit = S5P_CLKCON_SCLK0_MMC0,
508 .enable = s5p6440_sclk_ctrl,
510 .sources = &clkset_spi_mmc,
511 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 18, .size = 2 },
512 .reg_div = { .reg = S5P_CLK_DIV1, .shift = 0, .size = 4 },
517 .ctrlbit = S5P_CLKCON_SCLK0_MMC1,
518 .enable = s5p6440_sclk_ctrl,
520 .sources = &clkset_spi_mmc,
521 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 20, .size = 2 },
522 .reg_div = { .reg = S5P_CLK_DIV1, .shift = 4, .size = 4 },
527 .ctrlbit = S5P_CLKCON_SCLK0_MMC2,
528 .enable = s5p6440_sclk_ctrl,
530 .sources = &clkset_spi_mmc,
531 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 22, .size = 2 },
532 .reg_div = { .reg = S5P_CLK_DIV1, .shift = 8, .size = 4 },
537 .ctrlbit = S5P_CLKCON_SCLK0_UART,
538 .enable = s5p6440_sclk_ctrl,
540 .sources = &clkset_uart,
541 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 13, .size = 1 },
542 .reg_div = { .reg = S5P_CLK_DIV2, .shift = 16, .size = 4 },
547 .ctrlbit = S5P_CLKCON_SCLK0_SPI0,
548 .enable = s5p6440_sclk_ctrl,
550 .sources = &clkset_spi_mmc,
551 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 14, .size = 2 },
552 .reg_div = { .reg = S5P_CLK_DIV2, .shift = 0, .size = 4 },
557 .ctrlbit = S5P_CLKCON_SCLK0_SPI1,
558 .enable = s5p6440_sclk_ctrl,
560 .sources = &clkset_spi_mmc,
561 .reg_src = { .reg = S5P_CLK_SRC0, .shift = 16, .size = 2 },
562 .reg_div = { .reg = S5P_CLK_DIV2, .shift = 4, .size = 4 },
566 /* Clock initialisation code */
567 static struct clksrc_clk *sysclks[] = {
574 void __init_or_cpufreq s5p6440_setup_clocks(void)
576 struct clk *xtal_clk;
580 unsigned long hclk_low;
582 unsigned long pclk_low;
590 /* Set S5P6440 functions for clk_fout_epll */
591 clk_fout_epll.enable = s5p6440_epll_enable;
592 clk_fout_epll.ops = &s5p6440_epll_ops;
594 /* Set S5P6440 functions for arm clock */
595 clk_arm.parent = &clk_mout_apll.clk;
596 clk_arm.ops = &s5p6440_clkarm_ops;
597 clk_48m.enable = s5p6440_clk48m_ctrl;
599 clkdiv0 = __raw_readl(S5P_CLK_DIV0);
600 clkdiv3 = __raw_readl(S5P_CLK_DIV3);
602 xtal_clk = clk_get(NULL, "ext_xtal");
603 BUG_ON(IS_ERR(xtal_clk));
605 xtal = clk_get_rate(xtal_clk);
608 epll = s5p_get_pll90xx(xtal, __raw_readl(S5P_EPLL_CON),
609 __raw_readl(S5P_EPLL_CON_K));
610 mpll = s5p_get_pll45xx(xtal, __raw_readl(S5P_MPLL_CON), pll_4502);
611 apll = s5p_get_pll45xx(xtal, __raw_readl(S5P_APLL_CON), pll_4502);
613 printk(KERN_INFO "S5P6440: PLL settings, A=%ld.%ldMHz, M=%ld.%ldMHz," \
615 print_mhz(apll), print_mhz(mpll), print_mhz(epll));
617 fclk = apll / GET_DIV(clkdiv0, S5P_CLKDIV0_ARM);
618 hclk = fclk / GET_DIV(clkdiv0, S5P_CLKDIV0_HCLK);
619 pclk = hclk / GET_DIV(clkdiv0, S5P_CLKDIV0_PCLK);
621 if (__raw_readl(S5P_OTHERS) & S5P_OTHERS_HCLK_LOW_SEL_MPLL) {
622 /* Asynchronous mode */
623 hclk_low = mpll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
625 /* Synchronous mode */
626 hclk_low = apll / GET_DIV(clkdiv3, S5P_CLKDIV3_HCLK_LOW);
629 pclk_low = hclk_low / GET_DIV(clkdiv3, S5P_CLKDIV3_PCLK_LOW);
631 printk(KERN_INFO "S5P6440: HCLK=%ld.%ldMHz, HCLK_LOW=%ld.%ldMHz," \
632 " PCLK=%ld.%ldMHz, PCLK_LOW=%ld.%ldMHz\n",
633 print_mhz(hclk), print_mhz(hclk_low),
634 print_mhz(pclk), print_mhz(pclk_low));
636 clk_fout_mpll.rate = mpll;
637 clk_fout_epll.rate = epll;
638 clk_fout_apll.rate = apll;
643 clk_h_low.rate = hclk_low;
644 clk_p_low.rate = pclk_low;
646 for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
647 s3c_set_clksrc(&clksrcs[ptr], true);
650 static struct clk *clks[] __initdata = {
658 void __init s5p6440_register_clocks(void)
664 ret = s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
666 printk(KERN_ERR "Failed to register %u clocks\n", ret);
668 for (ptr = 0; ptr < ARRAY_SIZE(sysclks); ptr++)
669 s3c_register_clksrc(sysclks[ptr], 1);
671 s3c_register_clksrc(clksrcs, ARRAY_SIZE(clksrcs));
672 s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
674 clkp = init_clocks_disable;
675 for (ptr = 0; ptr < ARRAY_SIZE(init_clocks_disable); ptr++, clkp++) {
677 ret = s3c24xx_register_clock(clkp);
679 printk(KERN_ERR "Failed to register clock %s (%d)\n",
682 (clkp->enable)(clkp, 0);