diff options
Diffstat (limited to 'drivers/sysreset/sysreset_at91.c')
-rw-r--r-- | drivers/sysreset/sysreset_at91.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/drivers/sysreset/sysreset_at91.c b/drivers/sysreset/sysreset_at91.c new file mode 100644 index 0000000..24b87ee --- /dev/null +++ b/drivers/sysreset/sysreset_at91.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2022 Microchip Technology, Inc. and its subsidiaries + */ + +#include <asm/arch/hardware.h> +#include <asm/io.h> +#include <asm/arch/at91_rstc.h> +#include <clk.h> +#include <common.h> +#include <cpu_func.h> +#include <dm.h> +#include <dm/device_compat.h> +#include <dm/device-internal.h> +#include <sysreset.h> + +static int at91_sysreset_request(struct udevice *dev, enum sysreset_t type) +{ + at91_rstc_t *rstc = (at91_rstc_t *)dev_get_priv(dev); + + writel(AT91_RSTC_KEY + | AT91_RSTC_CR_PROCRST /* Processor Reset */ + | AT91_RSTC_CR_PERRST /* Peripheral Reset */ +#ifdef CONFIG_AT91RESET_EXTRST + | AT91_RSTC_CR_EXTRST /* External Reset (assert nRST pin) */ +#endif + , &rstc->cr); + + return -EINPROGRESS; +} + +static int at91_sysreset_probe(struct udevice *dev) +{ + struct clk slck; + void *priv; + int ret; + + priv = dev_remap_addr(dev); + if (!priv) + return -EINVAL; + + dev_set_priv(dev, priv); + + ret = clk_get_by_index(dev, 0, &slck); + if (ret) + return ret; + + ret = clk_prepare_enable(&slck); + if (ret) + return ret; + + return 0; +} + +static struct sysreset_ops at91_sysreset = { + .request = at91_sysreset_request, +}; + +static const struct udevice_id a91_sysreset_ids[] = { + { .compatible = "atmel,sama5d3-rstc" }, + { .compatible = "microchip,sam9x60-rstc" }, + { } +}; + +U_BOOT_DRIVER(sysreset_at91) = { + .id = UCLASS_SYSRESET, + .name = "at91_reset", + .ops = &at91_sysreset, + .probe = at91_sysreset_probe, + .of_match = a91_sysreset_ids, +}; |