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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>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 Stephan Gerhold <stephan@gerhold.net>
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*
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* Based on arch/arm/cpu/armv7/u8500/timer.c:
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* Copyright (C) 2010 Linaro Limited
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* John Rigby <john.rigby@linaro.org>
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*
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* Based on Linux kernel source and internal ST-Ericsson U-Boot source:
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* Copyright (C) 2009 Alessandro Rubini
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* Copyright (C) 2010 ST-Ericsson
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* Copyright (C) 2010 Linus Walleij for ST-Ericsson
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*/
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#include <common.h>
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#include <dm.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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#define MTU_NUM_TIMERS 4
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/* The timers */
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struct nomadik_mtu_timer_regs {
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u32 lr; /* Load register */
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u32 cv; /* Current value */
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u32 cr; /* Control register */
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u32 bglr; /* Background load register */
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};
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/* The MTU that contains the timers */
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struct nomadik_mtu_regs {
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u32 imsc; /* Interrupt mask set/clear */
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u32 ris; /* Raw interrupt status */
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u32 mis; /* Masked interrupt status */
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u32 icr; /* Interrupt clear register */
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struct nomadik_mtu_timer_regs timers[MTU_NUM_TIMERS];
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};
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/* Bits for the control register */
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#define MTU_CR_ONESHOT BIT(0) /* if 0 = wraps reloading from BGLR */
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#define MTU_CR_32BITS BIT(1) /* if 0 = 16-bit counter */
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#define MTU_CR_PRESCALE_SHIFT 2
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#define MTU_CR_PRESCALE_1 (0 << MTU_CR_PRESCALE_SHIFT)
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#define MTU_CR_PRESCALE_16 (1 << MTU_CR_PRESCALE_SHIFT)
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#define MTU_CR_PRESCALE_256 (2 << MTU_CR_PRESCALE_SHIFT)
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#define MTU_CR_PERIODIC BIT(6) /* if 0 = free-running */
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#define MTU_CR_ENABLE BIT(7)
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struct nomadik_mtu_priv {
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struct nomadik_mtu_timer_regs *timer;
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};
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static u64 nomadik_mtu_get_count(struct udevice *dev)
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{
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struct nomadik_mtu_priv *priv = dev_get_priv(dev);
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/* Decrementing counter: invert the value */
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return timer_conv_64(~readl(&priv->timer->cv));
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}
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static int nomadik_mtu_probe(struct udevice *dev)
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{
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struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
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struct nomadik_mtu_priv *priv = dev_get_priv(dev);
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struct nomadik_mtu_regs *mtu;
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u32 prescale;
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mtu = dev_read_addr_ptr(dev);
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if (!mtu)
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return -EINVAL;
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priv->timer = mtu->timers; /* Use first timer */
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if (!uc_priv->clock_rate)
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return -EINVAL;
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/* Use divide-by-16 counter if tick rate is more than 32 MHz */
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if (uc_priv->clock_rate > 32000000) {
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uc_priv->clock_rate /= 16;
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prescale = MTU_CR_PRESCALE_16;
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} else {
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prescale = MTU_CR_PRESCALE_1;
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}
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/* Configure a free-running, auto-wrap counter with selected prescale */
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writel(MTU_CR_ENABLE | prescale | MTU_CR_32BITS, &priv->timer->cr);
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return 0;
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}
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static const struct timer_ops nomadik_mtu_ops = {
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.get_count = nomadik_mtu_get_count,
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};
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static const struct udevice_id nomadik_mtu_ids[] = {
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{ .compatible = "st,nomadik-mtu" },
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{}
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};
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U_BOOT_DRIVER(nomadik_mtu) = {
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.name = "nomadik_mtu",
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.id = UCLASS_TIMER,
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.of_match = nomadik_mtu_ids,
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.priv_auto = sizeof(struct nomadik_mtu_priv),
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.probe = nomadik_mtu_probe,
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.ops = &nomadik_mtu_ops,
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};
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