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timer: gxp: Add HPE GXP timer support

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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>
This commit is contained in:
Nick Hawkins 2022-06-08 16:21:35 -05:00 committed by Tom Rini
parent 4276c9b2aa
commit b25913b40e
3 changed files with 72 additions and 0 deletions
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7
drivers/timer/Kconfig
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@ -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

1
drivers/timer/Makefile
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@ -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

64
drivers/timer/gxp-timer.c Normal file
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@ -0,0 +1,64 @@
// 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 <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,
};