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96 lines
2.3 KiB
96 lines
2.3 KiB
// 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, [email protected]. |
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* |
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* (C) Copyright 2004, Psyent Corporation <www.psyent.com> |
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* Scott McNutt <[email protected]> |
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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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/* 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 int altera_timer_get_count(struct udevice *dev, u64 *count) |
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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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*count = timer_conv_64(~val); |
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return 0; |
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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(devfdt_get_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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.flags = DM_FLAG_PRE_RELOC, |
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};
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