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timer: fttmr010: return a previously deleted driver now ported to DM

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The fttmr010 timer driver was deleted by
commit 29fc6f2492 ("ARM: remove a320evb board support")
The original source file was: arch/arm/cpu/arm920t/a320/timer.c

Return the driver to the codebase in a DM compatible form.
A platform using fttmr010 will be submitted later.

This hardware is described in the datasheet [1], starting from page 348.
According to the datasheet, there is a Revision Register at offset 0x3C,
which is not present in 'struct fttmr010'. Add it and debug() print
revision in probe function.

[1]
https://bitbucket.org/Kasreyn/mkrom-uc7112lx/src/master/documents/FIC8120_DS_v1.2.pdf

Signed-off-by: Sergei Antonov <saproj@gmail.com>
This commit is contained in:
Sergei Antonov
2023-02-13 20:34:36 +03:00
committed by Tom Rini
parent 48d7e58945
commit 2c0bdcacf3
4 changed files with 101 additions and 0 deletions
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92
drivers/timer/fttmr010_timer.c Normal file
View File

@@ -0,0 +1,92 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2009 Faraday Technology
* Po-Yu Chuang <ratbert@faraday-tech.com>
*
* 23/08/2022 Port to DM
*/
#include <common.h>
#include <dm.h>
#include <log.h>
#include <timer.h>
#include <asm/io.h>
#include <dm/ofnode.h>
#include <faraday/fttmr010.h>
#include <asm/global_data.h>
#define TIMER_LOAD_VAL 0xffffffff
struct fttmr010_timer_priv {
struct fttmr010 __iomem *regs;
};
static u64 fttmr010_timer_get_count(struct udevice *dev)
{
struct fttmr010_timer_priv *priv = dev_get_priv(dev);
struct fttmr010 *tmr = priv->regs;
u32 now = TIMER_LOAD_VAL - readl(&tmr->timer3_counter);
/* increment tbu if tbl has rolled over */
if (now < gd->arch.tbl)
gd->arch.tbu++;
gd->arch.tbl = now;
return ((u64)gd->arch.tbu << 32) | gd->arch.tbl;
}
static int fttmr010_timer_probe(struct udevice *dev)
{
struct fttmr010_timer_priv *priv = dev_get_priv(dev);
struct fttmr010 *tmr;
unsigned int cr;
priv->regs = dev_read_addr_ptr(dev);
if (!priv->regs)
return -EINVAL;
tmr = priv->regs;
debug("Faraday FTTMR010 timer revision 0x%08X\n", readl(&tmr->revision));
/* disable timers */
writel(0, &tmr->cr);
/* setup timer */
writel(TIMER_LOAD_VAL, &tmr->timer3_load);
writel(TIMER_LOAD_VAL, &tmr->timer3_counter);
writel(0, &tmr->timer3_match1);
writel(0, &tmr->timer3_match2);
/* we don't want timer to issue interrupts */
writel(FTTMR010_TM3_MATCH1 |
FTTMR010_TM3_MATCH2 |
FTTMR010_TM3_OVERFLOW,
&tmr->interrupt_mask);
cr = readl(&tmr->cr);
cr |= FTTMR010_TM3_CLOCK; /* use external clock */
cr |= FTTMR010_TM3_ENABLE;
writel(cr, &tmr->cr);
gd->arch.tbl = 0;
gd->arch.tbu = 0;
return 0;
}
static const struct timer_ops fttmr010_timer_ops = {
.get_count = fttmr010_timer_get_count,
};
static const struct udevice_id fttmr010_timer_ids[] = {
{ .compatible = "faraday,fttmr010-timer" },
{}
};
U_BOOT_DRIVER(fttmr010_timer) = {
.name = "fttmr010_timer",
.id = UCLASS_TIMER,
.of_match = fttmr010_timer_ids,
.priv_auto = sizeof(struct fttmr010_timer_priv),
.probe = fttmr010_timer_probe,
.ops = &fttmr010_timer_ops,
};