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41575d8e4c
This construct is quite long-winded. In earlier days it made some sense since auto-allocation was a strange concept. But with driver model now used pretty universally, we can shorten this to 'auto'. This reduces verbosity and makes it easier to read. Coincidentally it also ensures that every declaration is on one line, thus making dtoc's job easier. Signed-off-by: Simon Glass <sjg@chromium.org>
94 lines
2.3 KiB
C
94 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 = 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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