drivers/usb/host/ehci-atmel.c

   1 /*
   2  * (C) Copyright 2012
   3  * Atmel Semiconductor <www.atmel.com>
   4  * Written-by: Bo Shen <voice.shen@atmel.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <watchdog.h>
  11 #include <usb.h>
  12 #include <asm/io.h>
  13 #include <asm/arch/hardware.h>
  14 #include <asm/arch/at91_pmc.h>
  15 #include <asm/arch/clk.h>
  16
  17 #include "ehci.h"
  18
  19 /* Enable UTMI PLL time out 500us
  20  * 10 times as datasheet specified
  21  */
  22 #define EN_UPLL_TIMEOUT 500UL
  23
  24 int ehci_hcd_init(int index, enum usb_init_type init,
  25                 struct ehci_hccr **hccr, struct ehci_hcor **hcor)
  26 {
  27         at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
  28         ulong start_time, tmp_time;
  29
  30         start_time = get_timer(0);
  31         /* Enable UTMI PLL */
  32         writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
  33         while ((readl(&pmc->sr) & AT91_PMC_LOCKU) != AT91_PMC_LOCKU) {
  34                 WATCHDOG_RESET();
  35                 tmp_time = get_timer(0);
  36                 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
  37                         printf("ERROR: failed to enable UPLL\n");
  38                         return -1;
  39                 }
  40         }
  41
  42         /* Enable USB Host clock */
  43         writel(1 << ATMEL_ID_UHPHS, &pmc->pcer);
  44
  45         *hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI;
  46         *hcor = (struct ehci_hcor *)((uint32_t)*hccr +
  47                         HC_LENGTH(ehci_readl(&(*hccr)->cr_capbase)));
  48
  49         return 0;
  50 }
  51
  52 int ehci_hcd_stop(int index)
  53 {
  54         at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
  55         ulong start_time, tmp_time;
  56
  57         /* Disable USB Host Clock */
  58         writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr);
  59
  60         start_time = get_timer(0);
  61         /* Disable UTMI PLL */
  62         writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
  63         while ((readl(&pmc->sr) & AT91_PMC_LOCKU) == AT91_PMC_LOCKU) {
  64                 WATCHDOG_RESET();
  65                 tmp_time = get_timer(0);
  66                 if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
  67                         printf("ERROR: failed to stop UPLL\n");
  68                         return -1;
  69                 }
  70         }
  71
  72         return 0;
  73 }