arch/arm/mach-at91/clock.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2015 Atmel Corporation
   4  *                    Wenyou Yang <wenyou.yang@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 }