diff options
| -rw-r--r-- | drivers/timer/Kconfig | 7 | ||||
| -rw-r--r-- | drivers/timer/Makefile | 1 | ||||
| -rw-r--r-- | drivers/timer/riscv_timer.c | 56 |
3 files changed, 64 insertions, 0 deletions
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig index b0e6f32..df37a79 100644 --- a/drivers/timer/Kconfig +++ b/drivers/timer/Kconfig @@ -126,6 +126,13 @@ config OMAP_TIMER help Select this to enable an timer for Omap devices. +config RISCV_TIMER + bool "RISC-V timer support" + depends on TIMER && RISCV + help + Select this to enable support for the timer as defined + by the RISC-V privileged architecture spec. + config ROCKCHIP_TIMER bool "Rockchip timer support" depends on TIMER diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile index c4fbab2..d0bf218 100644 --- a/drivers/timer/Makefile +++ b/drivers/timer/Makefile @@ -13,6 +13,7 @@ obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence-ttc.o obj-$(CONFIG_DESIGNWARE_APB_TIMER) += dw-apb-timer.o obj-$(CONFIG_MPC83XX_TIMER) += mpc83xx_timer.o obj-$(CONFIG_OMAP_TIMER) += omap-timer.o +obj-$(CONFIG_RISCV_TIMER) += riscv_timer.o obj-$(CONFIG_ROCKCHIP_TIMER) += rockchip_timer.o obj-$(CONFIG_SANDBOX_TIMER) += sandbox_timer.o obj-$(CONFIG_STI_TIMER) += sti-timer.o diff --git a/drivers/timer/riscv_timer.c b/drivers/timer/riscv_timer.c new file mode 100644 index 0000000..9f9f070 --- /dev/null +++ b/drivers/timer/riscv_timer.c @@ -0,0 +1,56 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Copyright (C) 2018, Bin Meng <bmeng.cn@gmail.com> + * + * RISC-V privileged architecture defined generic timer driver + * + * This driver relies on RISC-V platform codes to provide the essential API + * riscv_get_time() which is supposed to return the timer counter as defined + * by the RISC-V privileged architecture spec. + * + * This driver can be used in both M-mode and S-mode U-Boot. + */ + +#include <common.h> +#include <dm.h> +#include <errno.h> +#include <timer.h> +#include <asm/io.h> + +/** + * riscv_get_time() - get the timer counter + * + * Platform codes should provide this API in order to make this driver function. + * + * @time: the 64-bit timer count as defined by the RISC-V privileged + * architecture spec. + * @return: 0 on success, -ve on error. + */ +extern int riscv_get_time(u64 *time); + +static int riscv_timer_get_count(struct udevice *dev, u64 *count) +{ + return riscv_get_time(count); +} + +static int riscv_timer_probe(struct udevice *dev) +{ + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + + /* clock frequency was passed from the cpu driver as driver data */ + uc_priv->clock_rate = dev->driver_data; + + return 0; +} + +static const struct timer_ops riscv_timer_ops = { + .get_count = riscv_timer_get_count, +}; + +U_BOOT_DRIVER(riscv_timer) = { + .name = "riscv_timer", + .id = UCLASS_TIMER, + .probe = riscv_timer_probe, + .ops = &riscv_timer_ops, + .flags = DM_FLAG_PRE_RELOC, +}; |