Home | History | Annotate | Download | only in mach-at91 
      1 // SPDX-License-Identifier: GPL-2.0+
      2 /*
      3  * Copyright (C) 2015 Atmel Corporation
      4  *		      Wenyou Yang <wenyou.yang (at) atmel.com>
      5  */
      6 
      7 #include <common.h>
      8 #include <asm/io.h>
      9 #include <asm/arch/hardware.h>
     10 #include <asm/arch/at91_pmc.h>
     11 
     12 #define EN_UPLL_TIMEOUT		500
     13 
     14 void at91_periph_clk_enable(int id)
     15 {
     16 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
     17 
     18 #ifdef CPU_HAS_PCR
     19 	u32 regval;
     20 	u32 div_value;
     21 
     22 	if (id > AT91_PMC_PCR_PID_MASK)
     23 		return;
     24 
     25 	writel(id, &pmc->pcr);
     26 
     27 	div_value = readl(&pmc->pcr) & AT91_PMC_PCR_DIV;
     28 
     29 	regval = AT91_PMC_PCR_EN | AT91_PMC_PCR_CMD_WRITE | id | div_value;
     30 
     31 	writel(regval, &pmc->pcr);
     32 #else
     33 	writel(0x01 << id, &pmc->pcer);
     34 #endif
     35 }
     36 
     37 void at91_periph_clk_disable(int id)
     38 {
     39 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
     40 
     41 #ifdef CPU_HAS_PCR
     42 	u32 regval;
     43 
     44 	if (id > AT91_PMC_PCR_PID_MASK)
     45 		return;
     46 
     47 	regval = AT91_PMC_PCR_CMD_WRITE | id;
     48 
     49 	writel(regval, &pmc->pcr);
     50 #else
     51 	writel(0x01 << id, &pmc->pcdr);
     52 #endif
     53 }
     54 
     55 void at91_system_clk_enable(int sys_clk)
     56 {
     57 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
     58 
     59 	writel(sys_clk, &pmc->scer);
     60 }
     61 
     62 void at91_system_clk_disable(int sys_clk)
     63 {
     64 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
     65 
     66 	writel(sys_clk, &pmc->scdr);
     67 }
     68 
     69 int at91_upll_clk_enable(void)
     70 {
     71 	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
     72 	ulong start_time, tmp_time;
     73 
     74 	if ((readl(&pmc->uckr) & AT91_PMC_UPLLEN) == AT91_PMC_UPLLEN)
     75 		return 0;
     76 
     77 	start_time = get_timer(0);
     78 	writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
     79 	while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) {
     80 		tmp_time = get_timer(0);
     81 		if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
     82 			printf("ERROR: failed to enable UPLL\n");
     83 			return -1;
     84 		}
     85 	}
     86 
     87 	return 0;
     88 }
     89 
     90 int at91_upll_clk_disable(void)
     91 {
     92 	struct at91_pmc *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
     93 	ulong start_time, tmp_time;
     94 
     95 	start_time = get_timer(0);
     96 	writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
     97 	while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) {
     98 		tmp_time = get_timer(0);
     99 		if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
    100 			printf("ERROR: failed to stop UPLL\n");
    101 			return -1;
    102 		}
    103 	}
    104 
    105 	return 0;
    106 }
    107 
    108 void at91_usb_clk_init(u32 value)
    109 {
    110 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
    111 
    112 	writel(value, &pmc->usb);
    113 }
    114 
    115 void at91_pllicpr_init(u32 icpr)
    116 {
    117 	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
    118 
    119 	writel(icpr, &pmc->pllicpr);
    120 }
    121