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