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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
94 lines
2.2 KiB
C
94 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2000-2002
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com>
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* Scott McNutt <smcnutt@psyent.com>
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*/
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#include <common.h>
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#include <dm.h>
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#include <errno.h>
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#include <timer.h>
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#include <asm/io.h>
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#include <linux/bitops.h>
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/* control register */
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#define ALTERA_TIMER_CONT BIT(1) /* Continuous mode */
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#define ALTERA_TIMER_START BIT(2) /* Start timer */
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#define ALTERA_TIMER_STOP BIT(3) /* Stop timer */
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struct altera_timer_regs {
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u32 status; /* Timer status reg */
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u32 control; /* Timer control reg */
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u32 periodl; /* Timeout period low */
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u32 periodh; /* Timeout period high */
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u32 snapl; /* Snapshot low */
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u32 snaph; /* Snapshot high */
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};
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struct altera_timer_plat {
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struct altera_timer_regs *regs;
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};
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static u64 altera_timer_get_count(struct udevice *dev)
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{
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struct altera_timer_plat *plat = dev_get_plat(dev);
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struct altera_timer_regs *const regs = plat->regs;
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u32 val;
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/* Trigger update */
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writel(0x0, ®s->snapl);
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/* Read timer value */
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val = readl(®s->snapl) & 0xffff;
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val |= (readl(®s->snaph) & 0xffff) << 16;
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return timer_conv_64(~val);
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}
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static int altera_timer_probe(struct udevice *dev)
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{
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struct altera_timer_plat *plat = dev_get_plat(dev);
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struct altera_timer_regs *const regs = plat->regs;
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writel(0, ®s->status);
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writel(0, ®s->control);
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writel(ALTERA_TIMER_STOP, ®s->control);
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writel(0xffff, ®s->periodl);
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writel(0xffff, ®s->periodh);
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writel(ALTERA_TIMER_CONT | ALTERA_TIMER_START, ®s->control);
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return 0;
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}
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static int altera_timer_of_to_plat(struct udevice *dev)
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{
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struct altera_timer_plat *plat = dev_get_plat(dev);
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plat->regs = map_physmem(dev_read_addr(dev),
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sizeof(struct altera_timer_regs),
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MAP_NOCACHE);
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return 0;
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}
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static const struct timer_ops altera_timer_ops = {
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.get_count = altera_timer_get_count,
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};
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static const struct udevice_id altera_timer_ids[] = {
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{ .compatible = "altr,timer-1.0" },
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{}
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};
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U_BOOT_DRIVER(altera_timer) = {
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.name = "altera_timer",
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.id = UCLASS_TIMER,
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.of_match = altera_timer_ids,
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.of_to_plat = altera_timer_of_to_plat,
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.plat_auto = sizeof(struct altera_timer_plat),
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.probe = altera_timer_probe,
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.ops = &altera_timer_ops,
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};
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