u-boot/drivers/usb/host/ehci-atmel.c
Bo Shen 97b2043da6 USB: ehci-atmel: use pcr to enable or disable clock
If the SoC has pcr, we use pcr (peripheral control register)
to enable or disable clock.

Signed-off-by: Bo Shen <voice.shen@atmel.com>
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
2014-09-19 00:11:21 +02:00

81 lines
1.8 KiB
C

/*
* (C) Copyright 2012
* Atmel Semiconductor <www.atmel.com>
* Written-by: Bo Shen <voice.shen@atmel.com>
*
* SPDX-License-Identifier: GPL-2.0+
*/
#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, enum usb_init_type init,
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 */
#ifdef CPU_HAS_PCR
at91_periph_clk_enable(ATMEL_ID_UHPHS);
#else
writel(1 << ATMEL_ID_UHPHS, &pmc->pcer);
#endif
*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 */
#ifdef CPU_HAS_PCR
at91_periph_clk_disable(ATMEL_ID_UHPHS);
#else
writel(1 << ATMEL_ID_UHPHS, &pmc->pcdr);
#endif
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;
}