3 * Sascha Hauer, Pengutronix
5 * (C) Copyright 2009 Freescale Semiconductor, Inc.
7 * See file CREDITS for list of people who contributed to this
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License as
12 * published by the Free Software Foundation; either version 2 of
13 * the License, or (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
28 #include <asm/errno.h>
29 #include <asm/arch/imx-regs.h>
30 #include <asm/arch/crm_regs.h>
31 #include <asm/arch/clock.h>
33 #include <asm/arch/sys_proto.h>
45 struct mxc_pll_reg *mxc_plls[PLL_CLOCKS] = {
46 [PLL1_CLOCK] = (struct mxc_pll_reg *)PLL1_BASE_ADDR,
47 [PLL2_CLOCK] = (struct mxc_pll_reg *)PLL2_BASE_ADDR,
48 [PLL3_CLOCK] = (struct mxc_pll_reg *)PLL3_BASE_ADDR,
50 [PLL4_CLOCK] = (struct mxc_pll_reg *)PLL4_BASE_ADDR,
54 #define AHB_CLK_ROOT 133333333
55 #define SZ_DEC_1M 1000000
56 #define PLL_PD_MAX 16 /* Actual pd+1 */
57 #define PLL_MFI_MAX 15
65 #define MX5_CBCMR 0x00015154
66 #define MX5_CBCDR 0x02888945
68 struct fixed_pll_mfd {
73 const struct fixed_pll_mfd fixed_mfd[] = {
84 #define PLL_FREQ_MAX(ref_clk) (4 * (ref_clk) * PLL_MFI_MAX)
85 #define PLL_FREQ_MIN(ref_clk) \
86 ((2 * (ref_clk) * (PLL_MFI_MIN - 1)) / PLL_PD_MAX)
87 #define MAX_DDR_CLK 420000000
88 #define NFC_CLK_MAX 34000000
90 struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)MXC_CCM_BASE;
92 int clk_enable(struct clk *clk)
98 if (clk->usecount++ == 0) {
99 ret = clk->enable(clk);
106 void clk_disable(struct clk *clk)
111 if (!(--clk->usecount)) {
115 if (clk->usecount < 0) {
116 printf("%s: clk %p underflow\n", __func__, clk);
121 void set_usboh3_clk(void)
123 clrsetbits_le32(&mxc_ccm->cscmr1,
124 MXC_CCM_CSCMR1_USBOH3_CLK_SEL_MASK,
125 MXC_CCM_CSCMR1_USBOH3_CLK_SEL(1));
126 clrsetbits_le32(&mxc_ccm->cscdr1,
127 MXC_CCM_CSCDR1_USBOH3_CLK_PODF_MASK |
128 MXC_CCM_CSCDR1_USBOH3_CLK_PRED_MASK,
129 MXC_CCM_CSCDR1_USBOH3_CLK_PRED(4) |
130 MXC_CCM_CSCDR1_USBOH3_CLK_PODF(1));
133 void enable_usboh3_clk(unsigned char enable)
135 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
137 clrsetbits_le32(&mxc_ccm->CCGR2,
138 MXC_CCM_CCGR2_USBOH3_60M(MXC_CCM_CCGR_CG_MASK),
139 MXC_CCM_CCGR2_USBOH3_60M(cg));
142 void ipu_clk_enable(void)
144 /* IPU root clock derived from AXI B */
145 clrsetbits_le32(&mxc_ccm->cbcmr, MXC_CCM_CBCMR_IPU_HSP_CLK_SEL_MASK,
146 MXC_CCM_CBCMR_IPU_HSP_CLK_SEL(1));
148 setbits_le32(&mxc_ccm->CCGR5,
149 MXC_CCM_CCGR5_IPU(MXC_CCM_CCGR_CG_MASK));
151 /* Handshake with IPU when certain clock rates are changed. */
152 clrbits_le32(&mxc_ccm->ccdr, MXC_CCM_CCDR_IPU_HS_MASK);
154 /* Handshake with IPU when LPM is entered as its enabled. */
155 clrbits_le32(&mxc_ccm->clpcr, MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS);
158 void ipu_clk_disable(void)
160 clrbits_le32(&mxc_ccm->CCGR5,
161 MXC_CCM_CCGR5_IPU(MXC_CCM_CCGR_CG_MASK));
163 /* Handshake with IPU when certain clock rates are changed. */
164 setbits_le32(&mxc_ccm->ccdr, MXC_CCM_CCDR_IPU_HS_MASK);
166 /* Handshake with IPU when LPM is entered as its enabled. */
167 setbits_le32(&mxc_ccm->clpcr, MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS);
170 #ifdef CONFIG_I2C_MXC
171 /* i2c_num can be from 0, to 1 for i.MX51 and 2 for i.MX53 */
172 int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
176 #if defined(CONFIG_MX51)
178 #elif defined(CONFIG_MX53)
182 mask = MXC_CCM_CCGR_CG_MASK <<
183 (MXC_CCM_CCGR1_I2C1_OFFSET + (i2c_num << 1));
185 setbits_le32(&mxc_ccm->CCGR1, mask);
187 clrbits_le32(&mxc_ccm->CCGR1, mask);
192 void set_usb_phy_clk(void)
194 clrbits_le32(&mxc_ccm->cscmr1, MXC_CCM_CSCMR1_USB_PHY_CLK_SEL);
197 #if defined(CONFIG_MX51)
198 void enable_usb_phy1_clk(unsigned char enable)
200 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
202 clrsetbits_le32(&mxc_ccm->CCGR2,
203 MXC_CCM_CCGR2_USB_PHY(MXC_CCM_CCGR_CG_MASK),
204 MXC_CCM_CCGR2_USB_PHY(cg));
207 void enable_usb_phy2_clk(unsigned char enable)
209 /* i.MX51 has a single USB PHY clock, so do nothing here. */
211 #elif defined(CONFIG_MX53)
212 void enable_usb_phy1_clk(unsigned char enable)
214 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
216 clrsetbits_le32(&mxc_ccm->CCGR4,
217 MXC_CCM_CCGR4_USB_PHY1(MXC_CCM_CCGR_CG_MASK),
218 MXC_CCM_CCGR4_USB_PHY1(cg));
221 void enable_usb_phy2_clk(unsigned char enable)
223 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
225 clrsetbits_le32(&mxc_ccm->CCGR4,
226 MXC_CCM_CCGR4_USB_PHY2(MXC_CCM_CCGR_CG_MASK),
227 MXC_CCM_CCGR4_USB_PHY2(cg));
232 * Calculate the frequency of PLLn.
234 static uint32_t decode_pll(struct mxc_pll_reg *pll, uint32_t infreq)
236 uint32_t ctrl, op, mfd, mfn, mfi, pdf, ret;
237 uint64_t refclk, temp;
240 ctrl = readl(&pll->ctrl);
242 if (ctrl & MXC_DPLLC_CTL_HFSM) {
243 mfn = readl(&pll->hfs_mfn);
244 mfd = readl(&pll->hfs_mfd);
245 op = readl(&pll->hfs_op);
247 mfn = readl(&pll->mfn);
248 mfd = readl(&pll->mfd);
249 op = readl(&pll->op);
252 mfd &= MXC_DPLLC_MFD_MFD_MASK;
253 mfn &= MXC_DPLLC_MFN_MFN_MASK;
254 pdf = op & MXC_DPLLC_OP_PDF_MASK;
255 mfi = MXC_DPLLC_OP_MFI_RD(op);
262 if (mfn >= 0x04000000) {
269 if (ctrl & MXC_DPLLC_CTL_DPDCK0_2_EN)
272 do_div(refclk, pdf + 1);
273 temp = refclk * mfn_abs;
274 do_div(temp, mfd + 1);
287 * This function returns the Frequency Pre-Multiplier clock.
289 static u32 get_fpm(void)
292 u32 ccr = readl(&mxc_ccm->ccr);
294 if (ccr & MXC_CCM_CCR_FPM_MULT)
299 return MXC_CLK32 * mult;
304 * This function returns the low power audio clock.
306 static u32 get_lp_apm(void)
309 u32 ccsr = readl(&mxc_ccm->ccsr);
311 if (ccsr & MXC_CCM_CCSR_LP_APM)
312 #if defined(CONFIG_MX51)
314 #elif defined(CONFIG_MX53)
315 ret_val = decode_pll(mxc_plls[PLL4_CLOCK], MXC_HCLK);
326 u32 get_mcu_main_clk(void)
330 reg = MXC_CCM_CACRR_ARM_PODF_RD(readl(&mxc_ccm->cacrr));
331 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
332 return freq / (reg + 1);
336 * Get the rate of peripheral's root clock.
338 u32 get_periph_clk(void)
342 reg = readl(&mxc_ccm->cbcdr);
343 if (!(reg & MXC_CCM_CBCDR_PERIPH_CLK_SEL))
344 return decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
345 reg = readl(&mxc_ccm->cbcmr);
346 switch (MXC_CCM_CBCMR_PERIPH_CLK_SEL_RD(reg)) {
348 return decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
350 return decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
360 * Get the rate of ipg clock.
362 static u32 get_ipg_clk(void)
364 uint32_t freq, reg, div;
366 freq = get_ahb_clk();
368 reg = readl(&mxc_ccm->cbcdr);
369 div = MXC_CCM_CBCDR_IPG_PODF_RD(reg) + 1;
375 * Get the rate of ipg_per clock.
377 static u32 get_ipg_per_clk(void)
379 u32 freq, pred1, pred2, podf;
381 if (readl(&mxc_ccm->cbcmr) & MXC_CCM_CBCMR_PERCLK_IPG_CLK_SEL)
382 return get_ipg_clk();
384 if (readl(&mxc_ccm->cbcmr) & MXC_CCM_CBCMR_PERCLK_LP_APM_CLK_SEL)
387 freq = get_periph_clk();
388 podf = readl(&mxc_ccm->cbcdr);
389 pred1 = MXC_CCM_CBCDR_PERCLK_PRED1_RD(podf);
390 pred2 = MXC_CCM_CBCDR_PERCLK_PRED2_RD(podf);
391 podf = MXC_CCM_CBCDR_PERCLK_PODF_RD(podf);
392 return freq / ((pred1 + 1) * (pred2 + 1) * (podf + 1));
395 /* Get the output clock rate of a standard PLL MUX for peripherals. */
396 static u32 get_standard_pll_sel_clk(u32 clk_sel)
400 switch (clk_sel & 0x3) {
402 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
405 freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
408 freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
419 * Get the rate of uart clk.
421 static u32 get_uart_clk(void)
423 unsigned int clk_sel, freq, reg, pred, podf;
425 reg = readl(&mxc_ccm->cscmr1);
426 clk_sel = MXC_CCM_CSCMR1_UART_CLK_SEL_RD(reg);
427 freq = get_standard_pll_sel_clk(clk_sel);
429 reg = readl(&mxc_ccm->cscdr1);
430 pred = MXC_CCM_CSCDR1_UART_CLK_PRED_RD(reg);
431 podf = MXC_CCM_CSCDR1_UART_CLK_PODF_RD(reg);
432 freq /= (pred + 1) * (podf + 1);
438 * get cspi clock rate.
440 static u32 imx_get_cspiclk(void)
442 u32 ret_val = 0, pdf, pre_pdf, clk_sel, freq;
443 u32 cscmr1 = readl(&mxc_ccm->cscmr1);
444 u32 cscdr2 = readl(&mxc_ccm->cscdr2);
446 pre_pdf = MXC_CCM_CSCDR2_CSPI_CLK_PRED_RD(cscdr2);
447 pdf = MXC_CCM_CSCDR2_CSPI_CLK_PODF_RD(cscdr2);
448 clk_sel = MXC_CCM_CSCMR1_CSPI_CLK_SEL_RD(cscmr1);
449 freq = get_standard_pll_sel_clk(clk_sel);
450 ret_val = freq / ((pre_pdf + 1) * (pdf + 1));
455 * get esdhc clock rate.
457 static u32 get_esdhc_clk(u32 port)
459 u32 clk_sel = 0, pred = 0, podf = 0, freq = 0;
460 u32 cscmr1 = readl(&mxc_ccm->cscmr1);
461 u32 cscdr1 = readl(&mxc_ccm->cscdr1);
465 clk_sel = MXC_CCM_CSCMR1_ESDHC1_MSHC1_CLK_SEL_RD(cscmr1);
466 pred = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PRED_RD(cscdr1);
467 podf = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PODF_RD(cscdr1);
470 clk_sel = MXC_CCM_CSCMR1_ESDHC2_MSHC2_CLK_SEL_RD(cscmr1);
471 pred = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PRED_RD(cscdr1);
472 podf = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PODF_RD(cscdr1);
475 if (cscmr1 & MXC_CCM_CSCMR1_ESDHC3_CLK_SEL)
476 return get_esdhc_clk(1);
478 return get_esdhc_clk(0);
480 if (cscmr1 & MXC_CCM_CSCMR1_ESDHC4_CLK_SEL)
481 return get_esdhc_clk(1);
483 return get_esdhc_clk(0);
488 freq = get_standard_pll_sel_clk(clk_sel) / ((pred + 1) * (podf + 1));
492 static u32 get_axi_a_clk(void)
494 u32 cbcdr = readl(&mxc_ccm->cbcdr);
495 u32 pdf = MXC_CCM_CBCDR_AXI_A_PODF_RD(cbcdr);
497 return get_periph_clk() / (pdf + 1);
500 static u32 get_axi_b_clk(void)
502 u32 cbcdr = readl(&mxc_ccm->cbcdr);
503 u32 pdf = MXC_CCM_CBCDR_AXI_B_PODF_RD(cbcdr);
505 return get_periph_clk() / (pdf + 1);
508 static u32 get_emi_slow_clk(void)
510 u32 cbcdr = readl(&mxc_ccm->cbcdr);
511 u32 emi_clk_sel = cbcdr & MXC_CCM_CBCDR_EMI_CLK_SEL;
512 u32 pdf = MXC_CCM_CBCDR_EMI_PODF_RD(cbcdr);
515 return get_ahb_clk() / (pdf + 1);
517 return get_periph_clk() / (pdf + 1);
520 static u32 get_ddr_clk(void)
523 u32 cbcmr = readl(&mxc_ccm->cbcmr);
524 u32 ddr_clk_sel = MXC_CCM_CBCMR_DDR_CLK_SEL_RD(cbcmr);
526 u32 cbcdr = readl(&mxc_ccm->cbcdr);
527 if (cbcdr & MXC_CCM_CBCDR_DDR_HIFREQ_SEL) {
528 u32 ddr_clk_podf = MXC_CCM_CBCDR_DDR_PODF_RD(cbcdr);
530 ret_val = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
531 ret_val /= ddr_clk_podf + 1;
536 switch (ddr_clk_sel) {
538 ret_val = get_axi_a_clk();
541 ret_val = get_axi_b_clk();
544 ret_val = get_emi_slow_clk();
547 ret_val = get_ahb_clk();
557 * The API of get mxc clocks.
559 unsigned int mxc_get_clock(enum mxc_clock clk)
563 return get_mcu_main_clk();
565 return get_ahb_clk();
567 return get_ipg_clk();
570 return get_ipg_per_clk();
572 return get_uart_clk();
574 return imx_get_cspiclk();
576 return get_esdhc_clk(0);
578 return get_esdhc_clk(1);
580 return get_esdhc_clk(2);
582 return get_esdhc_clk(3);
584 return get_ipg_clk();
586 return get_ahb_clk();
588 return get_ddr_clk();
595 u32 imx_get_uartclk(void)
597 return get_uart_clk();
600 u32 imx_get_fecclk(void)
602 return get_ipg_clk();
605 static int gcd(int m, int n)
620 * This is to calculate various parameters based on reference clock and
621 * targeted clock based on the equation:
622 * t_clk = 2*ref_freq*(mfi + mfn/(mfd+1))/(pd+1)
623 * This calculation is based on a fixed MFD value for simplicity.
625 static int calc_pll_params(u32 ref, u32 target, struct pll_param *pll)
627 u64 pd, mfi = 1, mfn, mfd, t1;
628 u32 n_target = target;
632 * Make sure targeted freq is in the valid range.
633 * Otherwise the following calculation might be wrong!!!
635 if (n_target < PLL_FREQ_MIN(ref) ||
636 n_target > PLL_FREQ_MAX(ref)) {
637 printf("Targeted peripheral clock should be"
638 "within [%d - %d]\n",
639 PLL_FREQ_MIN(ref) / SZ_DEC_1M,
640 PLL_FREQ_MAX(ref) / SZ_DEC_1M);
644 for (i = 0; i < ARRAY_SIZE(fixed_mfd); i++) {
645 if (fixed_mfd[i].ref_clk_hz == ref) {
646 mfd = fixed_mfd[i].mfd;
651 if (i == ARRAY_SIZE(fixed_mfd))
654 /* Use n_target and n_ref to avoid overflow */
655 for (pd = 1; pd <= PLL_PD_MAX; pd++) {
657 do_div(t1, (4 * n_ref));
659 if (mfi > PLL_MFI_MAX)
666 * Now got pd and mfi already
668 * mfn = (((n_target * pd) / 4 - n_ref * mfi) * mfd) / n_ref;
676 debug("ref=%d, target=%d, pd=%d," "mfi=%d,mfn=%d, mfd=%d\n",
677 ref, n_target, (u32)pd, (u32)mfi, (u32)mfn, (u32)mfd);
691 #define calc_div(tgt_clk, src_clk, limit) ({ \
693 if (((src_clk) % (tgt_clk)) <= 100) \
694 v = (src_clk) / (tgt_clk); \
696 v = ((src_clk) / (tgt_clk)) + 1;\
702 #define CHANGE_PLL_SETTINGS(pll, pd, fi, fn, fd) \
704 __raw_writel(0x1232, &pll->ctrl); \
705 __raw_writel(0x2, &pll->config); \
706 __raw_writel((((pd) - 1) << 0) | ((fi) << 4), \
708 __raw_writel(fn, &(pll->mfn)); \
709 __raw_writel((fd) - 1, &pll->mfd); \
710 __raw_writel((((pd) - 1) << 0) | ((fi) << 4), \
712 __raw_writel(fn, &pll->hfs_mfn); \
713 __raw_writel((fd) - 1, &pll->hfs_mfd); \
714 __raw_writel(0x1232, &pll->ctrl); \
715 while (!__raw_readl(&pll->ctrl) & 0x1) \
719 static int config_pll_clk(enum pll_clocks index, struct pll_param *pll_param)
721 u32 ccsr = __raw_readl(&mxc_ccm->ccsr);
722 struct mxc_pll_reg *pll = mxc_plls[index];
726 /* Switch ARM to PLL2 clock */
727 __raw_writel(ccsr | 0x4, &mxc_ccm->ccsr);
728 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
729 pll_param->mfi, pll_param->mfn,
732 __raw_writel(ccsr & ~0x4, &mxc_ccm->ccsr);
735 /* Switch to pll2 bypass clock */
736 __raw_writel(ccsr | 0x2, &mxc_ccm->ccsr);
737 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
738 pll_param->mfi, pll_param->mfn,
741 __raw_writel(ccsr & ~0x2, &mxc_ccm->ccsr);
744 /* Switch to pll3 bypass clock */
745 __raw_writel(ccsr | 0x1, &mxc_ccm->ccsr);
746 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
747 pll_param->mfi, pll_param->mfn,
750 __raw_writel(ccsr & ~0x1, &mxc_ccm->ccsr);
754 /* Switch to pll4 bypass clock */
755 __raw_writel(ccsr | 0x20, &mxc_ccm->ccsr);
756 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
757 pll_param->mfi, pll_param->mfn,
760 __raw_writel(ccsr & ~0x20, &mxc_ccm->ccsr);
770 /* Config CPU clock */
771 static int config_core_clk(u32 ref, u32 freq)
774 struct pll_param pll_param;
776 memset(&pll_param, 0, sizeof(struct pll_param));
778 /* The case that periph uses PLL1 is not considered here */
779 ret = calc_pll_params(ref, freq, &pll_param);
781 printf("Error: Can't find pll parameters for %u.%03uMHz ref %u.%03uMHz\n",
782 freq / 1000000, freq / 1000 % 1000,
783 ref / 1000000, ref / 1000 % 1000);
787 return config_pll_clk(PLL1_CLOCK, &pll_param);
790 static int config_nfc_clk(u32 nfc_clk)
792 u32 parent_rate = get_emi_slow_clk();
793 u32 div = parent_rate / nfc_clk;
799 if (parent_rate / div > NFC_CLK_MAX)
801 clrsetbits_le32(&mxc_ccm->cbcdr,
802 MXC_CCM_CBCDR_NFC_PODF_MASK,
803 MXC_CCM_CBCDR_NFC_PODF(div - 1));
804 while (readl(&mxc_ccm->cdhipr) != 0)
809 /* Config main_bus_clock for periphs */
810 static int config_periph_clk(u32 ref, u32 freq)
813 struct pll_param pll_param;
815 memset(&pll_param, 0, sizeof(struct pll_param));
817 if (readl(&mxc_ccm->cbcdr) & MXC_CCM_CBCDR_PERIPH_CLK_SEL) {
818 ret = calc_pll_params(ref, freq, &pll_param);
820 printf("Error:Can't find pll parameters: %d\n",
824 switch (MXC_CCM_CBCMR_PERIPH_CLK_SEL_RD(
825 readl(&mxc_ccm->cbcmr))) {
827 return config_pll_clk(PLL1_CLOCK, &pll_param);
830 return config_pll_clk(PLL3_CLOCK, &pll_param);
840 static int config_ddr_clk(u32 emi_clk)
843 s32 shift = 0, clk_sel, div = 1;
844 u32 cbcmr = readl(&mxc_ccm->cbcmr);
846 if (emi_clk > MAX_DDR_CLK) {
847 printf("Warning:DDR clock should not exceed %d MHz\n",
848 MAX_DDR_CLK / SZ_DEC_1M);
849 emi_clk = MAX_DDR_CLK;
852 clk_src = get_periph_clk();
853 /* Find DDR clock input */
854 clk_sel = MXC_CCM_CBCMR_DDR_CLK_SEL_RD(cbcmr);
872 if ((clk_src % emi_clk) < 10000000)
873 div = clk_src / emi_clk;
875 div = (clk_src / emi_clk) + 1;
879 clrsetbits_le32(&mxc_ccm->cbcdr, 0x7 << shift, (div - 1) << shift);
880 while (readl(&mxc_ccm->cdhipr) != 0)
882 writel(0x0, &mxc_ccm->ccdr);
888 * This function assumes the expected core clock has to be changed by
889 * modifying the PLL. This is NOT true always but for most of the times,
890 * it is. So it assumes the PLL output freq is the same as the expected
891 * core clock (presc=1) unless the core clock is less than PLL_FREQ_MIN.
892 * In the latter case, it will try to increase the presc value until
893 * (presc*core_clk) is greater than PLL_FREQ_MIN. It then makes call to
894 * calc_pll_params() and obtains the values of PD, MFI,MFN, MFD based
895 * on the targeted PLL and reference input clock to the PLL. Lastly,
896 * it sets the register based on these values along with the dividers.
897 * Note 1) There is no value checking for the passed-in divider values
898 * so the caller has to make sure those values are sensible.
899 * 2) Also adjust the NFC divider such that the NFC clock doesn't
900 * exceed NFC_CLK_MAX.
901 * 3) IPU HSP clock is independent of AHB clock. Even it can go up to
902 * 177MHz for higher voltage, this function fixes the max to 133MHz.
903 * 4) This function should not have allowed diag_printf() calls since
904 * the serial driver has been stoped. But leave then here to allow
905 * easy debugging by NOT calling the cyg_hal_plf_serial_stop().
907 int mxc_set_clock(u32 ref, u32 freq, enum mxc_clock clk)
913 if (config_core_clk(ref, freq))
917 if (config_periph_clk(ref, freq))
921 if (config_ddr_clk(freq))
925 if (config_nfc_clk(freq))
929 printf("Warning:Unsupported or invalid clock type\n");
937 * The clock for the external interface can be set to use internal clock
938 * if fuse bank 4, row 3, bit 2 is set.
939 * This is an undocumented feature and it was confirmed by Freescale's support:
940 * Fuses (but not pins) may be used to configure SATA clocks.
941 * Particularly the i.MX53 Fuse_Map contains the next information
942 * about configuring SATA clocks : SATA_ALT_REF_CLK[1:0] (offset 0x180C)
943 * '00' - 100MHz (External)
944 * '01' - 50MHz (External)
945 * '10' - 120MHz, internal (USB PHY)
948 void mxc_set_sata_internal_clock(void)
951 (u32 *)(IIM_BASE_ADDR + 0x180c);
955 clrsetbits_le32(tmp_base, 0x6, 0x4);
960 * Dump some core clockes.
962 int do_mx5_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
966 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
967 printf("PLL1 %8d MHz\n", freq / 1000000);
968 freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
969 printf("PLL2 %8d MHz\n", freq / 1000000);
970 freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
971 printf("PLL3 %8d MHz\n", freq / 1000000);
973 freq = decode_pll(mxc_plls[PLL4_CLOCK], MXC_HCLK);
974 printf("PLL4 %8d MHz\n", freq / 1000000);
978 printf("AHB %8d kHz\n", mxc_get_clock(MXC_AHB_CLK) / 1000);
979 printf("IPG %8d kHz\n", mxc_get_clock(MXC_IPG_CLK) / 1000);
980 printf("IPG PERCLK %8d kHz\n", mxc_get_clock(MXC_IPG_PERCLK) / 1000);
981 printf("DDR %8d kHz\n", mxc_get_clock(MXC_DDR_CLK) / 1000);
982 #ifdef CONFIG_MXC_SPI
983 printf("CSPI %8d kHz\n", mxc_get_clock(MXC_CSPI_CLK) / 1000);
988 /***************************************************/
991 clocks, CONFIG_SYS_MAXARGS, 1, do_mx5_showclocks,