diff options
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/cpu/at91-common/Makefile | 1 | ||||
| -rw-r--r-- | arch/arm/cpu/at91-common/phy.c | 57 | ||||
| -rw-r--r-- | arch/arm/include/asm/arch-at91/at91_common.h | 1 |
3 files changed, 59 insertions, 0 deletions
diff --git a/arch/arm/cpu/at91-common/Makefile b/arch/arm/cpu/at91-common/Makefile index d97053f..5b97838 100644 --- a/arch/arm/cpu/at91-common/Makefile +++ b/arch/arm/cpu/at91-common/Makefile @@ -8,4 +8,5 @@ # SPDX-License-Identifier: GPL-2.0+ # +obj-$(CONFIG_AT91_WANTS_COMMON_PHY) += phy.o obj-$(CONFIG_SPL_BUILD) += mpddrc.o spl.o diff --git a/arch/arm/cpu/at91-common/phy.c b/arch/arm/cpu/at91-common/phy.c new file mode 100644 index 0000000..3b6c60c --- /dev/null +++ b/arch/arm/cpu/at91-common/phy.c @@ -0,0 +1,57 @@ +/* + * (C) Copyright 2007-2008 + * Stelian Pop <stelian@popies.net> + * Lead Tech Design <www.leadtechdesign.com> + * + * (C) Copyright 2012 + * Markus Hubig <mhubig@imko.de> + * IMKO GmbH <www.imko.de> + * + * Copyright (C) 2013 DENX Software Engineering, hs@denx.de + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <asm/io.h> +#include <asm/sizes.h> +#include <asm/arch/at91_pmc.h> +#include <asm/arch/at91_rstc.h> +#include <watchdog.h> + +void at91_phy_reset(void) +{ + unsigned long erstl; + unsigned long start = get_timer(0); + unsigned long const timeout = 1000; /* 1000ms */ + at91_rstc_t *rstc = (at91_rstc_t *)ATMEL_BASE_RSTC; + + erstl = readl(&rstc->mr) & AT91_RSTC_MR_ERSTL_MASK; + + /* + * Need to reset PHY -> 500ms reset + * Reset PHY by pulling the NRST line for 500ms to low. To do so + * disable user reset for low level on NRST pin and poll the NRST + * level in reset status register. + */ + writel(AT91_RSTC_KEY | AT91_RSTC_MR_ERSTL(0x0D) | + AT91_RSTC_MR_URSTEN, &rstc->mr); + + writel(AT91_RSTC_KEY | AT91_RSTC_CR_EXTRST, &rstc->cr); + + /* Wait for end of hardware reset */ + while (!(readl(&rstc->sr) & AT91_RSTC_SR_NRSTL)) { + /* avoid shutdown by watchdog */ + WATCHDOG_RESET(); + mdelay(10); + + /* timeout for not getting stuck in an endless loop */ + if (get_timer(start) >= timeout) { + puts("*** ERROR: Timeout waiting for PHY reset!\n"); + break; + } + }; + + /* Restore NRST value */ + writel(AT91_RSTC_KEY | erstl | AT91_RSTC_MR_URSTEN, &rstc->mr); +} diff --git a/arch/arm/include/asm/arch-at91/at91_common.h b/arch/arm/include/asm/arch-at91/at91_common.h index 3ca4d5b..59e2f43 100644 --- a/arch/arm/include/asm/arch-at91/at91_common.h +++ b/arch/arm/include/asm/arch-at91/at91_common.h @@ -26,5 +26,6 @@ void at91_plla_init(u32 pllar); void at91_mck_init(u32 mckr); void at91_pmc_init(void); void mem_init(void); +void at91_phy_reset(void); #endif /* AT91_COMMON_H */ |