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timer: dw-apb: add reset handling

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To use this DM timer on socfpga as system tick, it needs to take itself
out of reset.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
This commit is contained in:
Simon Goldschmidt 2019-10-23 22:23:12 +02:00 • committed by Marek Vasut
parent 26fb85f4ab
commit caaaf62ac8
1 changed files with 17 additions and 1 deletions
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16
drivers/timer/dw-apb-timer.c
View file

@ -8,6 +8,7 @@
#include <common.h>
#include <dm.h>
#include <clk.h>
#include <reset.h>
#include <timer.h>
#include <asm/io.h>
@ -19,6 +20,7 @@
struct dw_apb_timer_priv {
fdt_addr_t regs;
struct reset_ctl_bulk resets;
};
static int dw_apb_timer_get_count(struct udevice *dev, u64 *count)
@ -42,6 +44,12 @@ static int dw_apb_timer_probe(struct udevice *dev)
struct clk clk;
int ret;
ret = reset_get_bulk(dev, &priv->resets);
if (ret)
dev_warn(dev, "Can't get reset: %d\n", ret);
else
reset_deassert_bulk(&priv->resets);
ret = clk_get_by_index(dev, 0, &clk);
if (ret)
return ret;
@ -67,6 +75,13 @@ static int dw_apb_timer_ofdata_to_platdata(struct udevice *dev)
return 0;
}
static int dw_apb_timer_remove(struct udevice *dev)
{
struct dw_apb_timer_priv *priv = dev_get_priv(dev);
return reset_release_bulk(&priv->resets);
}
static const struct timer_ops dw_apb_timer_ops = {
.get_count = dw_apb_timer_get_count,
};
@ -83,5 +98,6 @@ U_BOOT_DRIVER(dw_apb_timer) = {
.probe = dw_apb_timer_probe,
.of_match = dw_apb_timer_ids,
.ofdata_to_platdata = dw_apb_timer_ofdata_to_platdata,
.remove = dw_apb_timer_remove,
.priv_auto_alloc_size = sizeof(struct dw_apb_timer_priv),
};