mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-28 05:53:54 +00:00
d7a184d4a7
When a driver declares DM_FLAG_PRE_RELOC flag, it wishes to be bound before relocation. However due to a bug in the DM core, the flag only takes effect when devices are statically declared via U_BOOT_DEVICE(). This bug has been fixed recently by commit "dm: core: Respect drivers with the DM_FLAG_PRE_RELOC flag in lists_bind_fdt()", but with the fix, it has a side effect that all existing drivers that declared DM_FLAG_PRE_RELOC flag will be bound before relocation now. This may expose potential boot failure on some boards due to insufficient memory during the pre-relocation stage. To mitigate this potential impact, the following changes are implemented: - Remove DM_FLAG_PRE_RELOC flag in the driver, if the driver only supports configuration from device tree (OF_CONTROL) - Keep DM_FLAG_PRE_RELOC flag in the driver only if the device is statically declared via U_BOOT_DEVICE() - Surround DM_FLAG_PRE_RELOC flag with OF_CONTROL check, for drivers that support both statically declared devices and configuration from device tree Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
95 lines
2.3 KiB
C
95 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* (C) Copyright 2000-2002
|
|
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
|
|
*
|
|
* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
|
|
* Scott McNutt <smcnutt@psyent.com>
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <dm.h>
|
|
#include <errno.h>
|
|
#include <timer.h>
|
|
#include <asm/io.h>
|
|
|
|
/* control register */
|
|
#define ALTERA_TIMER_CONT BIT(1) /* Continuous mode */
|
|
#define ALTERA_TIMER_START BIT(2) /* Start timer */
|
|
#define ALTERA_TIMER_STOP BIT(3) /* Stop timer */
|
|
|
|
struct altera_timer_regs {
|
|
u32 status; /* Timer status reg */
|
|
u32 control; /* Timer control reg */
|
|
u32 periodl; /* Timeout period low */
|
|
u32 periodh; /* Timeout period high */
|
|
u32 snapl; /* Snapshot low */
|
|
u32 snaph; /* Snapshot high */
|
|
};
|
|
|
|
struct altera_timer_platdata {
|
|
struct altera_timer_regs *regs;
|
|
};
|
|
|
|
static int altera_timer_get_count(struct udevice *dev, u64 *count)
|
|
{
|
|
struct altera_timer_platdata *plat = dev->platdata;
|
|
struct altera_timer_regs *const regs = plat->regs;
|
|
u32 val;
|
|
|
|
/* Trigger update */
|
|
writel(0x0, ®s->snapl);
|
|
|
|
/* Read timer value */
|
|
val = readl(®s->snapl) & 0xffff;
|
|
val |= (readl(®s->snaph) & 0xffff) << 16;
|
|
*count = timer_conv_64(~val);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int altera_timer_probe(struct udevice *dev)
|
|
{
|
|
struct altera_timer_platdata *plat = dev->platdata;
|
|
struct altera_timer_regs *const regs = plat->regs;
|
|
|
|
writel(0, ®s->status);
|
|
writel(0, ®s->control);
|
|
writel(ALTERA_TIMER_STOP, ®s->control);
|
|
|
|
writel(0xffff, ®s->periodl);
|
|
writel(0xffff, ®s->periodh);
|
|
writel(ALTERA_TIMER_CONT | ALTERA_TIMER_START, ®s->control);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int altera_timer_ofdata_to_platdata(struct udevice *dev)
|
|
{
|
|
struct altera_timer_platdata *plat = dev_get_platdata(dev);
|
|
|
|
plat->regs = map_physmem(devfdt_get_addr(dev),
|
|
sizeof(struct altera_timer_regs),
|
|
MAP_NOCACHE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct timer_ops altera_timer_ops = {
|
|
.get_count = altera_timer_get_count,
|
|
};
|
|
|
|
static const struct udevice_id altera_timer_ids[] = {
|
|
{ .compatible = "altr,timer-1.0" },
|
|
{}
|
|
};
|
|
|
|
U_BOOT_DRIVER(altera_timer) = {
|
|
.name = "altera_timer",
|
|
.id = UCLASS_TIMER,
|
|
.of_match = altera_timer_ids,
|
|
.ofdata_to_platdata = altera_timer_ofdata_to_platdata,
|
|
.platdata_auto_alloc_size = sizeof(struct altera_timer_platdata),
|
|
.probe = altera_timer_probe,
|
|
.ops = &altera_timer_ops,
|
|
};
|