3 * Sascha Hauer, Pengutronix
5 * (C) Copyright 2009 Freescale Semiconductor, Inc.
7 * SPDX-License-Identifier: GPL-2.0+
12 #include <asm/errno.h>
13 #include <asm/arch/imx-regs.h>
14 #include <asm/arch/crm_regs.h>
15 #include <asm/arch/clock.h>
17 #include <asm/arch/sys_proto.h>
29 struct mxc_pll_reg *mxc_plls[PLL_CLOCKS] = {
30 [PLL1_CLOCK] = (struct mxc_pll_reg *)PLL1_BASE_ADDR,
31 [PLL2_CLOCK] = (struct mxc_pll_reg *)PLL2_BASE_ADDR,
32 [PLL3_CLOCK] = (struct mxc_pll_reg *)PLL3_BASE_ADDR,
34 [PLL4_CLOCK] = (struct mxc_pll_reg *)PLL4_BASE_ADDR,
38 #define AHB_CLK_ROOT 133333333
39 #define SZ_DEC_1M 1000000
40 #define PLL_PD_MAX 16 /* Actual pd+1 */
41 #define PLL_MFI_MAX 15
49 struct fixed_pll_mfd {
54 const struct fixed_pll_mfd fixed_mfd[] = {
65 #define PLL_FREQ_MAX(ref_clk) (4 * (ref_clk) * PLL_MFI_MAX)
66 #define PLL_FREQ_MIN(ref_clk) \
67 ((2 * (ref_clk) * (PLL_MFI_MIN - 1)) / PLL_PD_MAX)
68 #define MAX_DDR_CLK 420000000
69 #define NFC_CLK_MAX 34000000
71 struct mxc_ccm_reg *mxc_ccm = (struct mxc_ccm_reg *)MXC_CCM_BASE;
73 int clk_enable(struct clk *clk)
81 printf("enabling %s.%d clock %d\n", clk->name, clk->id, clk->usecount);
83 printf("enabling %s clock %d\n", clk->name, clk->usecount);
84 if (clk->usecount++ == 0) {
87 ret = clk->enable(clk);
94 void clk_disable(struct clk *clk)
100 printf("disabling %s.%d clock %d\n", clk->name, clk->id, clk->usecount);
102 printf("disabling %s clock %d\n", clk->name, clk->usecount);
103 if (!(--clk->usecount)) {
107 if (clk->usecount < 0) {
108 printf("%s: clk %p (%s) underflow\n", __func__, clk, clk->name);
113 int clk_get_usecount(struct clk *clk)
118 return clk->usecount;
121 u32 clk_get_rate(struct clk *clk)
129 struct clk *clk_get_parent(struct clk *clk)
137 int clk_set_rate(struct clk *clk, unsigned long rate)
139 if (clk && clk->set_rate)
140 clk->set_rate(clk, rate);
144 long clk_round_rate(struct clk *clk, unsigned long rate)
146 if (clk == NULL || !clk->round_rate)
149 return clk->round_rate(clk, rate);
152 int clk_set_parent(struct clk *clk, struct clk *parent)
154 debug("Setting parent of clk %p to %p (%p)\n", clk, parent,
155 clk ? clk->parent : NULL);
157 if (!clk || clk == parent)
160 if (clk->set_parent) {
163 ret = clk->set_parent(clk, parent);
167 clk->parent = parent;
171 void set_usboh3_clk(void)
173 clrsetbits_le32(&mxc_ccm->cscmr1,
174 MXC_CCM_CSCMR1_USBOH3_CLK_SEL_MASK,
175 MXC_CCM_CSCMR1_USBOH3_CLK_SEL(1));
176 clrsetbits_le32(&mxc_ccm->cscdr1,
177 MXC_CCM_CSCDR1_USBOH3_CLK_PODF_MASK |
178 MXC_CCM_CSCDR1_USBOH3_CLK_PRED_MASK,
179 MXC_CCM_CSCDR1_USBOH3_CLK_PRED(4) |
180 MXC_CCM_CSCDR1_USBOH3_CLK_PODF(1));
183 void enable_usboh3_clk(unsigned char enable)
185 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
187 clrsetbits_le32(&mxc_ccm->CCGR2,
188 MXC_CCM_CCGR2_USBOH3_60M(MXC_CCM_CCGR_CG_MASK),
189 MXC_CCM_CCGR2_USBOH3_60M(cg));
192 void ipu_clk_enable(void)
194 /* IPU root clock derived from AXI B */
195 clrsetbits_le32(&mxc_ccm->cbcmr, MXC_CCM_CBCMR_IPU_HSP_CLK_SEL_MASK,
196 MXC_CCM_CBCMR_IPU_HSP_CLK_SEL(1));
198 setbits_le32(&mxc_ccm->CCGR5,
199 MXC_CCM_CCGR5_IPU(MXC_CCM_CCGR_CG_MASK));
201 /* Handshake with IPU when certain clock rates are changed. */
202 clrbits_le32(&mxc_ccm->ccdr, MXC_CCM_CCDR_IPU_HS_MASK);
204 /* Handshake with IPU when LPM is entered as its enabled. */
205 clrbits_le32(&mxc_ccm->clpcr, MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS);
208 void ipu_clk_disable(void)
210 clrbits_le32(&mxc_ccm->CCGR5,
211 MXC_CCM_CCGR5_IPU(MXC_CCM_CCGR_CG_MASK));
213 /* Handshake with IPU when certain clock rates are changed. */
214 setbits_le32(&mxc_ccm->ccdr, MXC_CCM_CCDR_IPU_HS_MASK);
216 /* Handshake with IPU when LPM is entered as its enabled. */
217 setbits_le32(&mxc_ccm->clpcr, MXC_CCM_CLPCR_BYPASS_IPU_LPM_HS);
220 void ipu_di_clk_enable(int di)
224 setbits_le32(&mxc_ccm->CCGR6,
225 MXC_CCM_CCGR6_IPU_DI0(MXC_CCM_CCGR_CG_MASK));
228 setbits_le32(&mxc_ccm->CCGR6,
229 MXC_CCM_CCGR6_IPU_DI1(MXC_CCM_CCGR_CG_MASK));
232 printf("%s: Invalid DI index %d\n", __func__, di);
236 void ipu_di_clk_disable(int di)
240 clrbits_le32(&mxc_ccm->CCGR6,
241 MXC_CCM_CCGR6_IPU_DI0(MXC_CCM_CCGR_CG_MASK));
244 clrbits_le32(&mxc_ccm->CCGR6,
245 MXC_CCM_CCGR6_IPU_DI1(MXC_CCM_CCGR_CG_MASK));
248 printf("%s: Invalid DI index %d\n", __func__, di);
253 void ldb_clk_enable(int ldb)
257 setbits_le32(&mxc_ccm->CCGR6,
258 MXC_CCM_CCGR6_LDB_DI0(MXC_CCM_CCGR_CG_MASK));
261 setbits_le32(&mxc_ccm->CCGR6,
262 MXC_CCM_CCGR6_LDB_DI1(MXC_CCM_CCGR_CG_MASK));
265 printf("%s: Invalid LDB index %d\n", __func__, ldb);
269 void ldb_clk_disable(int ldb)
273 clrbits_le32(&mxc_ccm->CCGR6,
274 MXC_CCM_CCGR6_LDB_DI0(MXC_CCM_CCGR_CG_MASK));
277 clrbits_le32(&mxc_ccm->CCGR6,
278 MXC_CCM_CCGR6_LDB_DI1(MXC_CCM_CCGR_CG_MASK));
281 printf("%s: Invalid LDB index %d\n", __func__, ldb);
286 #ifdef CONFIG_I2C_MXC
287 /* i2c_num can be from 0, to 1 for i.MX51 and 2 for i.MX53 */
288 int enable_i2c_clk(unsigned char enable, unsigned i2c_num)
292 #if defined(CONFIG_MX51)
294 #elif defined(CONFIG_MX53)
298 mask = MXC_CCM_CCGR_CG_MASK <<
299 (MXC_CCM_CCGR1_I2C1_OFFSET + (i2c_num << 1));
301 setbits_le32(&mxc_ccm->CCGR1, mask);
303 clrbits_le32(&mxc_ccm->CCGR1, mask);
308 void set_usb_phy_clk(void)
310 clrbits_le32(&mxc_ccm->cscmr1, MXC_CCM_CSCMR1_USB_PHY_CLK_SEL);
313 #if defined(CONFIG_MX51)
314 void enable_usb_phy1_clk(unsigned char enable)
316 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
318 clrsetbits_le32(&mxc_ccm->CCGR2,
319 MXC_CCM_CCGR2_USB_PHY(MXC_CCM_CCGR_CG_MASK),
320 MXC_CCM_CCGR2_USB_PHY(cg));
323 void enable_usb_phy2_clk(unsigned char enable)
325 /* i.MX51 has a single USB PHY clock, so do nothing here. */
327 #elif defined(CONFIG_MX53)
328 void enable_usb_phy1_clk(unsigned char enable)
330 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
332 clrsetbits_le32(&mxc_ccm->CCGR4,
333 MXC_CCM_CCGR4_USB_PHY1(MXC_CCM_CCGR_CG_MASK),
334 MXC_CCM_CCGR4_USB_PHY1(cg));
337 void enable_usb_phy2_clk(unsigned char enable)
339 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
341 clrsetbits_le32(&mxc_ccm->CCGR4,
342 MXC_CCM_CCGR4_USB_PHY2(MXC_CCM_CCGR_CG_MASK),
343 MXC_CCM_CCGR4_USB_PHY2(cg));
348 * Calculate the frequency of PLLn.
350 static uint32_t decode_pll(struct mxc_pll_reg *pll, uint32_t infreq)
352 uint32_t ctrl, op, mfd, mfn, mfi, pdf, ret;
353 uint64_t refclk, temp;
356 ctrl = readl(&pll->ctrl);
358 if (ctrl & MXC_DPLLC_CTL_HFSM) {
359 mfn = readl(&pll->hfs_mfn);
360 mfd = readl(&pll->hfs_mfd);
361 op = readl(&pll->hfs_op);
363 mfn = readl(&pll->mfn);
364 mfd = readl(&pll->mfd);
365 op = readl(&pll->op);
368 mfd &= MXC_DPLLC_MFD_MFD_MASK;
369 mfn &= MXC_DPLLC_MFN_MFN_MASK;
370 pdf = op & MXC_DPLLC_OP_PDF_MASK;
371 mfi = MXC_DPLLC_OP_MFI_RD(op);
378 if (mfn >= 0x04000000) {
385 if (ctrl & MXC_DPLLC_CTL_DPDCK0_2_EN)
388 do_div(refclk, pdf + 1);
389 temp = refclk * mfn_abs;
390 do_div(temp, mfd + 1);
403 * This function returns the Frequency Pre-Multiplier clock.
405 static u32 get_fpm(void)
408 u32 ccr = readl(&mxc_ccm->ccr);
410 if (ccr & MXC_CCM_CCR_FPM_MULT)
415 return MXC_CLK32 * mult;
420 * This function returns the low power audio clock.
422 static u32 get_lp_apm(void)
425 u32 ccsr = readl(&mxc_ccm->ccsr);
427 if (ccsr & MXC_CCM_CCSR_LP_APM)
428 #if defined(CONFIG_MX51)
430 #elif defined(CONFIG_MX53)
431 ret_val = decode_pll(mxc_plls[PLL4_CLOCK], MXC_HCLK);
442 u32 get_mcu_main_clk(void)
446 reg = MXC_CCM_CACRR_ARM_PODF_RD(readl(&mxc_ccm->cacrr));
447 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
448 return freq / (reg + 1);
452 * Get the rate of peripheral's root clock.
454 u32 get_periph_clk(void)
458 reg = readl(&mxc_ccm->cbcdr);
459 if (!(reg & MXC_CCM_CBCDR_PERIPH_CLK_SEL))
460 return decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
461 reg = readl(&mxc_ccm->cbcmr);
462 switch (MXC_CCM_CBCMR_PERIPH_CLK_SEL_RD(reg)) {
464 return decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
466 return decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
476 * Get the rate of ipg clock.
478 static u32 get_ipg_clk(void)
480 uint32_t freq, reg, div;
482 freq = get_ahb_clk();
484 reg = readl(&mxc_ccm->cbcdr);
485 div = MXC_CCM_CBCDR_IPG_PODF_RD(reg) + 1;
491 * Get the rate of ipg_per clock.
493 static u32 get_ipg_per_clk(void)
495 u32 freq, pred1, pred2, podf;
497 if (readl(&mxc_ccm->cbcmr) & MXC_CCM_CBCMR_PERCLK_IPG_CLK_SEL)
498 return get_ipg_clk();
500 if (readl(&mxc_ccm->cbcmr) & MXC_CCM_CBCMR_PERCLK_LP_APM_CLK_SEL)
503 freq = get_periph_clk();
504 podf = readl(&mxc_ccm->cbcdr);
505 pred1 = MXC_CCM_CBCDR_PERCLK_PRED1_RD(podf);
506 pred2 = MXC_CCM_CBCDR_PERCLK_PRED2_RD(podf);
507 podf = MXC_CCM_CBCDR_PERCLK_PODF_RD(podf);
508 return freq / ((pred1 + 1) * (pred2 + 1) * (podf + 1));
511 /* Get the output clock rate of a standard PLL MUX for peripherals. */
512 static u32 get_standard_pll_sel_clk(u32 clk_sel)
516 switch (clk_sel & 0x3) {
518 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
521 freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
524 freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
535 * Get the rate of uart clk.
537 static u32 get_uart_clk(void)
539 unsigned int clk_sel, freq, reg, pred, podf;
541 reg = readl(&mxc_ccm->cscmr1);
542 clk_sel = MXC_CCM_CSCMR1_UART_CLK_SEL_RD(reg);
543 freq = get_standard_pll_sel_clk(clk_sel);
545 reg = readl(&mxc_ccm->cscdr1);
546 pred = MXC_CCM_CSCDR1_UART_CLK_PRED_RD(reg);
547 podf = MXC_CCM_CSCDR1_UART_CLK_PODF_RD(reg);
548 freq /= (pred + 1) * (podf + 1);
554 * get cspi clock rate.
556 static u32 imx_get_cspiclk(void)
558 u32 ret_val = 0, pdf, pre_pdf, clk_sel, freq;
559 u32 cscmr1 = readl(&mxc_ccm->cscmr1);
560 u32 cscdr2 = readl(&mxc_ccm->cscdr2);
562 pre_pdf = MXC_CCM_CSCDR2_CSPI_CLK_PRED_RD(cscdr2);
563 pdf = MXC_CCM_CSCDR2_CSPI_CLK_PODF_RD(cscdr2);
564 clk_sel = MXC_CCM_CSCMR1_CSPI_CLK_SEL_RD(cscmr1);
565 freq = get_standard_pll_sel_clk(clk_sel);
566 ret_val = freq / ((pre_pdf + 1) * (pdf + 1));
571 * get esdhc clock rate.
573 static u32 get_esdhc_clk(u32 port)
575 u32 clk_sel = 0, pred = 0, podf = 0, freq = 0;
576 u32 cscmr1 = readl(&mxc_ccm->cscmr1);
577 u32 cscdr1 = readl(&mxc_ccm->cscdr1);
581 clk_sel = MXC_CCM_CSCMR1_ESDHC1_MSHC1_CLK_SEL_RD(cscmr1);
582 pred = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PRED_RD(cscdr1);
583 podf = MXC_CCM_CSCDR1_ESDHC1_MSHC1_CLK_PODF_RD(cscdr1);
586 clk_sel = MXC_CCM_CSCMR1_ESDHC2_MSHC2_CLK_SEL_RD(cscmr1);
587 pred = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PRED_RD(cscdr1);
588 podf = MXC_CCM_CSCDR1_ESDHC2_MSHC2_CLK_PODF_RD(cscdr1);
591 if (cscmr1 & MXC_CCM_CSCMR1_ESDHC3_CLK_SEL)
592 return get_esdhc_clk(1);
594 return get_esdhc_clk(0);
596 if (cscmr1 & MXC_CCM_CSCMR1_ESDHC4_CLK_SEL)
597 return get_esdhc_clk(1);
599 return get_esdhc_clk(0);
604 freq = get_standard_pll_sel_clk(clk_sel) / ((pred + 1) * (podf + 1));
608 static u32 get_axi_a_clk(void)
610 u32 cbcdr = readl(&mxc_ccm->cbcdr);
611 u32 pdf = MXC_CCM_CBCDR_AXI_A_PODF_RD(cbcdr);
613 return get_periph_clk() / (pdf + 1);
616 static u32 get_axi_b_clk(void)
618 u32 cbcdr = readl(&mxc_ccm->cbcdr);
619 u32 pdf = MXC_CCM_CBCDR_AXI_B_PODF_RD(cbcdr);
621 return get_periph_clk() / (pdf + 1);
624 static u32 get_emi_slow_clk(void)
626 u32 cbcdr = readl(&mxc_ccm->cbcdr);
627 u32 emi_clk_sel = cbcdr & MXC_CCM_CBCDR_EMI_CLK_SEL;
628 u32 pdf = MXC_CCM_CBCDR_EMI_PODF_RD(cbcdr);
631 return get_ahb_clk() / (pdf + 1);
633 return get_periph_clk() / (pdf + 1);
636 static u32 get_ddr_clk(void)
639 u32 cbcmr = readl(&mxc_ccm->cbcmr);
640 u32 ddr_clk_sel = MXC_CCM_CBCMR_DDR_CLK_SEL_RD(cbcmr);
642 u32 cbcdr = readl(&mxc_ccm->cbcdr);
643 if (cbcdr & MXC_CCM_CBCDR_DDR_HIFREQ_SEL) {
644 u32 ddr_clk_podf = MXC_CCM_CBCDR_DDR_PODF_RD(cbcdr);
646 ret_val = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
647 ret_val /= ddr_clk_podf + 1;
652 switch (ddr_clk_sel) {
654 ret_val = get_axi_a_clk();
657 ret_val = get_axi_b_clk();
660 ret_val = get_emi_slow_clk();
663 ret_val = get_ahb_clk();
673 * The API of get mxc clocks.
675 unsigned int mxc_get_clock(enum mxc_clock clk)
679 return get_mcu_main_clk();
681 return get_ahb_clk();
683 return get_ipg_clk();
686 return get_ipg_per_clk();
688 return get_uart_clk();
690 return imx_get_cspiclk();
692 return get_esdhc_clk(0);
694 return get_esdhc_clk(1);
696 return get_esdhc_clk(2);
698 return get_esdhc_clk(3);
700 return get_ipg_clk();
702 return get_ahb_clk();
704 return get_ddr_clk();
711 u32 imx_get_uartclk(void)
713 return get_uart_clk();
716 u32 imx_get_fecclk(void)
718 return get_ipg_clk();
721 static int gcd(int m, int n)
736 * This is to calculate various parameters based on reference clock and
737 * targeted clock based on the equation:
738 * t_clk = 2*ref_freq*(mfi + mfn/(mfd+1))/(pd+1)
739 * This calculation is based on a fixed MFD value for simplicity.
741 static int calc_pll_params(u32 ref, u32 target, struct pll_param *pll)
743 u64 pd, mfi = 1, mfn, mfd, t1;
744 u32 n_target = target;
748 * Make sure targeted freq is in the valid range.
749 * Otherwise the following calculation might be wrong!!!
751 if (n_target < PLL_FREQ_MIN(ref) ||
752 n_target > PLL_FREQ_MAX(ref)) {
753 printf("Targeted peripheral clock should be within [%d - %d]\n",
754 PLL_FREQ_MIN(ref) / SZ_DEC_1M,
755 PLL_FREQ_MAX(ref) / SZ_DEC_1M);
759 for (i = 0; i < ARRAY_SIZE(fixed_mfd); i++) {
760 if (fixed_mfd[i].ref_clk_hz == ref) {
761 mfd = fixed_mfd[i].mfd;
766 if (i == ARRAY_SIZE(fixed_mfd))
769 /* Use n_target and n_ref to avoid overflow */
770 for (pd = 1; pd <= PLL_PD_MAX; pd++) {
772 do_div(t1, (4 * n_ref));
774 if (mfi > PLL_MFI_MAX)
781 * Now got pd and mfi already
783 * mfn = (((n_target * pd) / 4 - n_ref * mfi) * mfd) / n_ref;
791 debug("ref=%d, target=%d, pd=%d," "mfi=%d,mfn=%d, mfd=%d\n",
792 ref, n_target, (u32)pd, (u32)mfi, (u32)mfn, (u32)mfd);
806 #define calc_div(tgt_clk, src_clk, limit) ({ \
808 if (((src_clk) % (tgt_clk)) <= 100) \
809 v = (src_clk) / (tgt_clk); \
811 v = ((src_clk) / (tgt_clk)) + 1;\
817 #define CHANGE_PLL_SETTINGS(pll, pd, fi, fn, fd) \
819 __raw_writel(0x1232, &pll->ctrl); \
820 __raw_writel(0x2, &pll->config); \
821 __raw_writel((((pd) - 1) << 0) | ((fi) << 4), \
823 __raw_writel(fn, &(pll->mfn)); \
824 __raw_writel((fd) - 1, &pll->mfd); \
825 __raw_writel((((pd) - 1) << 0) | ((fi) << 4), \
827 __raw_writel(fn, &pll->hfs_mfn); \
828 __raw_writel((fd) - 1, &pll->hfs_mfd); \
829 __raw_writel(0x1232, &pll->ctrl); \
830 while (!__raw_readl(&pll->ctrl) & 0x1) \
834 static int config_pll_clk(enum pll_clocks index, struct pll_param *pll_param)
836 u32 ccsr = __raw_readl(&mxc_ccm->ccsr);
837 struct mxc_pll_reg *pll = mxc_plls[index];
841 /* Switch ARM to PLL2 clock */
842 __raw_writel(ccsr | 0x4, &mxc_ccm->ccsr);
843 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
844 pll_param->mfi, pll_param->mfn,
847 __raw_writel(ccsr & ~0x4, &mxc_ccm->ccsr);
850 /* Switch to pll2 bypass clock */
851 __raw_writel(ccsr | 0x2, &mxc_ccm->ccsr);
852 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
853 pll_param->mfi, pll_param->mfn,
856 __raw_writel(ccsr & ~0x2, &mxc_ccm->ccsr);
859 /* Switch to pll3 bypass clock */
860 __raw_writel(ccsr | 0x1, &mxc_ccm->ccsr);
861 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
862 pll_param->mfi, pll_param->mfn,
865 __raw_writel(ccsr & ~0x1, &mxc_ccm->ccsr);
869 /* Switch to pll4 bypass clock */
870 __raw_writel(ccsr | 0x20, &mxc_ccm->ccsr);
871 CHANGE_PLL_SETTINGS(pll, pll_param->pd,
872 pll_param->mfi, pll_param->mfn,
875 __raw_writel(ccsr & ~0x20, &mxc_ccm->ccsr);
885 /* Config CPU clock */
886 static int config_core_clk(u32 ref, u32 freq)
889 struct pll_param pll_param;
891 memset(&pll_param, 0, sizeof(struct pll_param));
893 /* The case that periph uses PLL1 is not considered here */
894 ret = calc_pll_params(ref, freq, &pll_param);
896 printf("Error: Can't find pll parameters for %u.%03uMHz ref %u.%03uMHz\n",
897 freq / 1000000, freq / 1000 % 1000,
898 ref / 1000000, ref / 1000 % 1000);
902 return config_pll_clk(PLL1_CLOCK, &pll_param);
905 static int config_nfc_clk(u32 nfc_clk)
907 u32 parent_rate = get_emi_slow_clk();
912 div = parent_rate / nfc_clk;
915 if (parent_rate / div > NFC_CLK_MAX)
917 clrsetbits_le32(&mxc_ccm->cbcdr,
918 MXC_CCM_CBCDR_NFC_PODF_MASK,
919 MXC_CCM_CBCDR_NFC_PODF(div - 1));
920 while (readl(&mxc_ccm->cdhipr) != 0)
925 void enable_nfc_clk(unsigned char enable)
927 unsigned int cg = enable ? MXC_CCM_CCGR_CG_ON : MXC_CCM_CCGR_CG_OFF;
929 clrsetbits_le32(&mxc_ccm->CCGR5,
930 MXC_CCM_CCGR5_EMI_ENFC(MXC_CCM_CCGR_CG_MASK),
931 MXC_CCM_CCGR5_EMI_ENFC(cg));
934 /* Config main_bus_clock for periphs */
935 static int config_periph_clk(u32 ref, u32 freq)
938 struct pll_param pll_param;
940 memset(&pll_param, 0, sizeof(struct pll_param));
942 if (readl(&mxc_ccm->cbcdr) & MXC_CCM_CBCDR_PERIPH_CLK_SEL) {
943 ret = calc_pll_params(ref, freq, &pll_param);
945 printf("Error:Can't find pll parameters: %d\n",
949 switch (MXC_CCM_CBCMR_PERIPH_CLK_SEL_RD(
950 readl(&mxc_ccm->cbcmr))) {
952 return config_pll_clk(PLL1_CLOCK, &pll_param);
955 return config_pll_clk(PLL3_CLOCK, &pll_param);
965 static int config_ddr_clk(u32 emi_clk)
968 s32 shift = 0, clk_sel, div = 1;
969 u32 cbcmr = readl(&mxc_ccm->cbcmr);
971 if (emi_clk > MAX_DDR_CLK) {
972 printf("Warning:DDR clock should not exceed %d MHz\n",
973 MAX_DDR_CLK / SZ_DEC_1M);
974 emi_clk = MAX_DDR_CLK;
977 clk_src = get_periph_clk();
978 /* Find DDR clock input */
979 clk_sel = MXC_CCM_CBCMR_DDR_CLK_SEL_RD(cbcmr);
997 if ((clk_src % emi_clk) < 10000000)
998 div = clk_src / emi_clk;
1000 div = (clk_src / emi_clk) + 1;
1004 clrsetbits_le32(&mxc_ccm->cbcdr, 0x7 << shift, (div - 1) << shift);
1005 while (readl(&mxc_ccm->cdhipr) != 0)
1007 writel(0x0, &mxc_ccm->ccdr);
1013 * This function assumes the expected core clock has to be changed by
1014 * modifying the PLL. This is NOT true always but for most of the times,
1015 * it is. So it assumes the PLL output freq is the same as the expected
1016 * core clock (presc=1) unless the core clock is less than PLL_FREQ_MIN.
1017 * In the latter case, it will try to increase the presc value until
1018 * (presc*core_clk) is greater than PLL_FREQ_MIN. It then makes call to
1019 * calc_pll_params() and obtains the values of PD, MFI,MFN, MFD based
1020 * on the targeted PLL and reference input clock to the PLL. Lastly,
1021 * it sets the register based on these values along with the dividers.
1022 * Note 1) There is no value checking for the passed-in divider values
1023 * so the caller has to make sure those values are sensible.
1024 * 2) Also adjust the NFC divider such that the NFC clock doesn't
1025 * exceed NFC_CLK_MAX.
1026 * 3) IPU HSP clock is independent of AHB clock. Even it can go up to
1027 * 177MHz for higher voltage, this function fixes the max to 133MHz.
1028 * 4) This function should not have allowed diag_printf() calls since
1029 * the serial driver has been stoped. But leave then here to allow
1030 * easy debugging by NOT calling the cyg_hal_plf_serial_stop().
1032 int mxc_set_clock(u32 ref, u32 freq, enum mxc_clock clk)
1038 if (config_core_clk(ref, freq))
1041 case MXC_PERIPH_CLK:
1042 if (config_periph_clk(ref, freq))
1046 if (config_ddr_clk(freq))
1050 if (config_nfc_clk(freq))
1054 printf("Warning:Unsupported or invalid clock type\n");
1062 * The clock for the external interface can be set to use internal clock
1063 * if fuse bank 4, row 3, bit 2 is set.
1064 * This is an undocumented feature and it was confirmed by Freescale's support:
1065 * Fuses (but not pins) may be used to configure SATA clocks.
1066 * Particularly the i.MX53 Fuse_Map contains the next information
1067 * about configuring SATA clocks : SATA_ALT_REF_CLK[1:0] (offset 0x180C)
1068 * '00' - 100MHz (External)
1069 * '01' - 50MHz (External)
1070 * '10' - 120MHz, internal (USB PHY)
1073 void mxc_set_sata_internal_clock(void)
1076 (u32 *)(IIM_BASE_ADDR + 0x180c);
1080 clrsetbits_le32(tmp_base, 0x6, 0x4);
1085 * Dump some core clockes.
1087 #define pr_clk_val(c, v) { \
1088 printf("%-11s %3lu.%03lu MHz\n", #c, \
1089 (v) / 1000000, (v) / 1000 % 1000); \
1092 #define pr_clk(c) { \
1093 unsigned long __clk = mxc_get_clock(MXC_##c##_CLK); \
1094 pr_clk_val(c, __clk); \
1097 int do_mx5_showclocks(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
1101 freq = decode_pll(mxc_plls[PLL1_CLOCK], MXC_HCLK);
1102 pr_clk_val(PLL1, freq);
1103 freq = decode_pll(mxc_plls[PLL2_CLOCK], MXC_HCLK);
1104 pr_clk_val(PLL2, freq);
1105 freq = decode_pll(mxc_plls[PLL3_CLOCK], MXC_HCLK);
1106 pr_clk_val(PLL3, freq);
1108 freq = decode_pll(mxc_plls[PLL4_CLOCK], MXC_HCLK);
1109 pr_clk_val(PLL4, freq);
1117 #ifdef CONFIG_MXC_SPI
1123 /***************************************************/
1126 clocks, CONFIG_SYS_MAXARGS, 1, do_mx5_showclocks,