From: Nick Hawkins nick.hawkins@hpe.com
Add support for the HPE GXP SOC timer. The GXP supports several different kinds of timers but for the purpose of this driver there is only support for the General Timer. The timer has a 1us resolution and is 56 bits.
Signed-off-by: Nick Hawkins nick.hawkins@hpe.com --- drivers/timer/Kconfig | 7 +++++ drivers/timer/Makefile | 1 + drivers/timer/gxp-timer.c | 65 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 73 insertions(+) create mode 100644 drivers/timer/gxp-timer.c
diff --git a/drivers/timer/Kconfig b/drivers/timer/Kconfig index 7b8ab56ed3..d592dba285 100644 --- a/drivers/timer/Kconfig +++ b/drivers/timer/Kconfig @@ -139,6 +139,13 @@ config DESIGNWARE_APB_TIMER Enables support for the Designware APB Timer driver. This timer is present on Altera SoCFPGA SoCs.
+config GXP_TIMER + bool "HPE GXP Timer" + depends on TIMER + help + Enables support for the GXP Timer driver. This timer is + present on HPE GXP SoCs. + config MPC83XX_TIMER bool "MPC83xx timer support" depends on TIMER diff --git a/drivers/timer/Makefile b/drivers/timer/Makefile index b2f002d597..cc2b8516b5 100644 --- a/drivers/timer/Makefile +++ b/drivers/timer/Makefile @@ -12,6 +12,7 @@ obj-$(CONFIG_$(SPL_)ATMEL_PIT_TIMER) += atmel_pit_timer.o obj-$(CONFIG_$(SPL_)ATMEL_TCB_TIMER) += atmel_tcb_timer.o obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence-ttc.o obj-$(CONFIG_DESIGNWARE_APB_TIMER) += dw-apb-timer.o +obj-$(CONFIG_GXP_TIMER) += gxp-timer.o obj-$(CONFIG_MPC83XX_TIMER) += mpc83xx_timer.o obj-$(CONFIG_NOMADIK_MTU_TIMER) += nomadik-mtu-timer.o obj-$(CONFIG_NPCM_TIMER) += npcm-timer.o diff --git a/drivers/timer/gxp-timer.c b/drivers/timer/gxp-timer.c new file mode 100644 index 0000000000..db11eddf74 --- /dev/null +++ b/drivers/timer/gxp-timer.c @@ -0,0 +1,65 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * GXP timer driver + * + * (C) Copyright 2022 Hewlett Packard Enterprise Development LP. + * Author: Nick Hawkins nick.hawkins@hpe.com + * Author: Jean-Marie Verdun verdun@hpe.com + */ + +#include <clk.h> +#include <common.h> +#include <dm.h> +#include <timer.h> +#include <asm/io.h> + +#define USTIMELO 0x18 +#define USTIMEHI 0x1C + +struct gxp_timer_priv { + void __iomem *base; +}; + +static u64 gxp_timer_get_count(struct udevice *dev) +{ + struct gxp_timer_priv *priv = dev_get_priv(dev); + u64 val; + + val = readl(priv->base + USTIMEHI); + val = (val << 32) | readl(priv->base + USTIMELO); + + return val; +} + +static int gxp_timer_probe(struct udevice *dev) +{ + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev); + struct gxp_timer_priv *priv = dev_get_priv(dev); + + priv->base = dev_read_addr_ptr(dev); + if (!priv->base) + return -ENOENT; + + uc_priv->clock_rate = 1000000; + + return 0; +} + +static const struct timer_ops gxp_timer_ops = { + .get_count = gxp_timer_get_count, +}; + +static const struct udevice_id gxp_timer_ids[] = { + { .compatible = "hpe,gxp-timer" }, + {} +}; + +U_BOOT_DRIVER(gxp_timer) = { + .name = "gxp-timer", + .id = UCLASS_TIMER, + .of_match = gxp_timer_ids, + .priv_auto = sizeof(struct gxp_timer_priv), + .probe = gxp_timer_probe, + .ops = &gxp_timer_ops, + .flags = DM_FLAG_PRE_RELOC, +};