mirror of
https://github.com/AsahiLinux/u-boot
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90 lines
2.4 KiB
C
90 lines
2.4 KiB
C
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/*
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* (C) Copyright 2012
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* Atmel Semiconductor <www.atmel.com>
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* Written-by: Bo Shen <voice.shen@atmel.com>
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301 USA
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*/
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#include <common.h>
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#include <watchdog.h>
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#include <usb.h>
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#include <asm/io.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/at91_pmc.h>
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#include <asm/arch/clk.h>
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#include "ehci.h"
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#include "ehci-core.h"
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/* Enable UTMI PLL time out 500us
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* 10 times as datasheet specified
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*/
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#define EN_UPLL_TIMEOUT 500UL
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int ehci_hcd_init(void)
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{
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at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
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ulong start_time, tmp_time;
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start_time = get_timer(0);
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/* Enable UTMI PLL */
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writel(AT91_PMC_UPLLEN | AT91_PMC_BIASEN, &pmc->uckr);
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while (readl(&pmc->sr) & AT91_PMC_LOCKU != AT91_PMC_LOCKU) {
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WATCHDOG_RESET();
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tmp_time = get_timer(0);
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if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
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printf("ERROR: failed to enable UPLL\n");
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return -1;
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}
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}
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/* Enable USB Host clock */
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writel(1 << ATMEL_ID_UHPHS, &pmc->pcer);
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hccr = (struct ehci_hccr *)ATMEL_BASE_EHCI;
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hcor = (struct ehci_hcor *)((uint32_t)hccr +
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HC_LENGTH(ehci_readl(&hccr->cr_capbase)));
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return 0;
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}
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int ehci_hcd_stop(void)
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{
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at91_pmc_t *pmc = (at91_pmc_t *)ATMEL_BASE_PMC;
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ulong start_time, tmp_time;
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/* Disable USB Host Clock */
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writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr);
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start_time = get_timer(0);
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/* Disable UTMI PLL */
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writel(readl(&pmc->uckr) & ~AT91_PMC_UPLLEN, &pmc->uckr);
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while (readl(&pmc->sr) & AT91_PMC_LOCKU == AT91_PMC_LOCKU) {
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WATCHDOG_RESET();
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tmp_time = get_timer(0);
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if ((tmp_time - start_time) > EN_UPLL_TIMEOUT) {
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printf("ERROR: failed to stop UPLL\n");
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return -1;
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}
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}
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return 0;
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}
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