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linux/arch/mips/ralink/timer.c
Stephen Boyd 322e577b02
MIPS: Remove dev_err() usage after platform_get_irq()
We don't need dev_err() messages when platform_get_irq() fails now that
platform_get_irq() prints an error message itself when something goes
wrong. Let's remove these prints with a simple semantic patch.

// <smpl>
@@
expression ret;
struct platform_device *E;
@@

ret =
(
platform_get_irq(E, ...)
|
platform_get_irq_byname(E, ...)
);

if ( \( ret < 0 \| ret <= 0 \) )
{
(
-if (ret != -EPROBE_DEFER)
-{ ...
-dev_err(...);
-... }
|
...
-dev_err(...);
)
...
}
// </smpl>

While we're here, remove braces on if statements that only have one
statement (manually).

Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paul.burton@mips.com>
Cc: James Hogan <jhogan@kernel.org>
Cc: linux-mips@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Paul Burton <paul.burton@mips.com>
Cc: linux-kernel@vger.kernel.org
2019-08-26 11:26:04 +01:00

152 lines
3.3 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Ralink RT2880 timer
* Author: John Crispin
*
* Copyright (C) 2013 John Crispin <john@phrozen.org>
*/
#include <linux/platform_device.h>
#include <linux/interrupt.h>
#include <linux/timer.h>
#include <linux/of_gpio.h>
#include <linux/clk.h>
#include <asm/mach-ralink/ralink_regs.h>
#define TIMER_REG_TMRSTAT 0x00
#define TIMER_REG_TMR0LOAD 0x10
#define TIMER_REG_TMR0CTL 0x18
#define TMRSTAT_TMR0INT BIT(0)
#define TMR0CTL_ENABLE BIT(7)
#define TMR0CTL_MODE_PERIODIC BIT(4)
#define TMR0CTL_PRESCALER 1
#define TMR0CTL_PRESCALE_VAL (0xf - TMR0CTL_PRESCALER)
#define TMR0CTL_PRESCALE_DIV (65536 / BIT(TMR0CTL_PRESCALER))
struct rt_timer {
struct device *dev;
void __iomem *membase;
int irq;
unsigned long timer_freq;
unsigned long timer_div;
};
static inline void rt_timer_w32(struct rt_timer *rt, u8 reg, u32 val)
{
__raw_writel(val, rt->membase + reg);
}
static inline u32 rt_timer_r32(struct rt_timer *rt, u8 reg)
{
return __raw_readl(rt->membase + reg);
}
static irqreturn_t rt_timer_irq(int irq, void *_rt)
{
struct rt_timer *rt = (struct rt_timer *) _rt;
rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
rt_timer_w32(rt, TIMER_REG_TMRSTAT, TMRSTAT_TMR0INT);
return IRQ_HANDLED;
}
static int rt_timer_request(struct rt_timer *rt)
{
int err = request_irq(rt->irq, rt_timer_irq, 0,
dev_name(rt->dev), rt);
if (err) {
dev_err(rt->dev, "failed to request irq\n");
} else {
u32 t = TMR0CTL_MODE_PERIODIC | TMR0CTL_PRESCALE_VAL;
rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
}
return err;
}
static int rt_timer_config(struct rt_timer *rt, unsigned long divisor)
{
if (rt->timer_freq < divisor)
rt->timer_div = rt->timer_freq;
else
rt->timer_div = divisor;
rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
return 0;
}
static int rt_timer_enable(struct rt_timer *rt)
{
u32 t;
rt_timer_w32(rt, TIMER_REG_TMR0LOAD, rt->timer_freq / rt->timer_div);
t = rt_timer_r32(rt, TIMER_REG_TMR0CTL);
t |= TMR0CTL_ENABLE;
rt_timer_w32(rt, TIMER_REG_TMR0CTL, t);
return 0;
}
static int rt_timer_probe(struct platform_device *pdev)
{
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
struct rt_timer *rt;
struct clk *clk;
rt = devm_kzalloc(&pdev->dev, sizeof(*rt), GFP_KERNEL);
if (!rt) {
dev_err(&pdev->dev, "failed to allocate memory\n");
return -ENOMEM;
}
rt->irq = platform_get_irq(pdev, 0);
if (rt->irq < 0)
return rt->irq;
rt->membase = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(rt->membase))
return PTR_ERR(rt->membase);
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "failed get clock rate\n");
return PTR_ERR(clk);
}
rt->timer_freq = clk_get_rate(clk) / TMR0CTL_PRESCALE_DIV;
if (!rt->timer_freq)
return -EINVAL;
rt->dev = &pdev->dev;
platform_set_drvdata(pdev, rt);
rt_timer_request(rt);
rt_timer_config(rt, 2);
rt_timer_enable(rt);
dev_info(&pdev->dev, "maximum frequency is %luHz\n", rt->timer_freq);
return 0;
}
static const struct of_device_id rt_timer_match[] = {
{ .compatible = "ralink,rt2880-timer" },
{},
};
static struct platform_driver rt_timer_driver = {
.probe = rt_timer_probe,
.driver = {
.name = "rt-timer",
.of_match_table = rt_timer_match,
.suppress_bind_attrs = true,
},
};
builtin_platform_driver(rt_timer_driver);