95 lines
2.3 KiB
C
95 lines
2.3 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_platdata {
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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_platdata *plat = dev->platdata;
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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_platdata *plat = dev->platdata;
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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_ofdata_to_platdata(struct udevice *dev)
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{
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struct altera_timer_platdata *plat = dev_get_platdata(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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.ofdata_to_platdata = altera_timer_ofdata_to_platdata,
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.platdata_auto_alloc_size = sizeof(struct altera_timer_platdata),
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.probe = altera_timer_probe,
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.ops = &altera_timer_ops,
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};
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