b2ec9efc1f
Declare pwm_ops structures as const as they are only stored in the ops
field of a pwm_chip structure. This field is of type const struct pwm_ops
*, so pwm_ops structures having this property can be declared as const.
Done using Coccinelle:
@r1 disable optional_qualifier@
identifier i;
position p;
@@
static struct pwm_ops i@p={...};
@ok1@
identifier r1.i;
position p;
struct pxa_pwm_chip pwm;
struct bfin_pwm_chip bwm;
struct vt8500_chip vp;
struct imx_chip icp;
@@
(
pwm.chip.ops=&i@p
|
bwm.chip.ops=&i@p
|
vp.chip.ops=&i@p
|
icp.chip.ops=&i@p
)
@bad@
position p!={r1.p,ok1.p};
identifier r1.i;
@@
i@p
@depends on !bad disable optional_qualifier@
identifier r1.i;
@@
+const
struct pwm_ops i;
File size details:
text data bss dec hex filename
1646 328 0 1974 7b6 drivers/pwm/pwm-imx.o
1742 224 0 1966 7ae drivers/pwm/pwm-imx.o
1941 296 0 2237 8bd drivers/pwm/pwm-pxa.o
2037 192 0 2229 8b5 drivers/pwm/pwm-pxa.o
1946 296 0 2242 8c2 drivers/pwm/pwm-vt8500.o
2050 192 0 2242 8c2 drivers/pwm/pwm-vt8500.o
The drivers/pwm/pwm-bfin.o file did not compile.
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
160 lines
3.1 KiB
C
160 lines
3.1 KiB
C
/*
|
|
* Blackfin Pulse Width Modulation (PWM) core
|
|
*
|
|
* Copyright (c) 2011 Analog Devices Inc.
|
|
*
|
|
* Licensed under the GPL-2 or later.
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pwm.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <asm/gptimers.h>
|
|
#include <asm/portmux.h>
|
|
|
|
struct bfin_pwm_chip {
|
|
struct pwm_chip chip;
|
|
};
|
|
|
|
struct bfin_pwm {
|
|
unsigned short pin;
|
|
};
|
|
|
|
static const unsigned short pwm_to_gptimer_per[] = {
|
|
P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR4, P_TMR5,
|
|
P_TMR6, P_TMR7, P_TMR8, P_TMR9, P_TMR10, P_TMR11,
|
|
};
|
|
|
|
static int bfin_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm)
|
|
{
|
|
struct bfin_pwm *priv;
|
|
int ret;
|
|
|
|
if (pwm->hwpwm >= ARRAY_SIZE(pwm_to_gptimer_per))
|
|
return -EINVAL;
|
|
|
|
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
|
|
if (!priv)
|
|
return -ENOMEM;
|
|
|
|
priv->pin = pwm_to_gptimer_per[pwm->hwpwm];
|
|
|
|
ret = peripheral_request(priv->pin, NULL);
|
|
if (ret) {
|
|
kfree(priv);
|
|
return ret;
|
|
}
|
|
|
|
pwm_set_chip_data(pwm, priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bfin_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
|
|
{
|
|
struct bfin_pwm *priv = pwm_get_chip_data(pwm);
|
|
|
|
if (priv) {
|
|
peripheral_free(priv->pin);
|
|
kfree(priv);
|
|
}
|
|
}
|
|
|
|
static int bfin_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
|
int duty_ns, int period_ns)
|
|
{
|
|
struct bfin_pwm *priv = pwm_get_chip_data(pwm);
|
|
unsigned long period, duty;
|
|
unsigned long long val;
|
|
|
|
val = (unsigned long long)get_sclk() * period_ns;
|
|
do_div(val, NSEC_PER_SEC);
|
|
period = val;
|
|
|
|
val = (unsigned long long)period * duty_ns;
|
|
do_div(val, period_ns);
|
|
duty = period - val;
|
|
|
|
if (duty >= period)
|
|
duty = period - 1;
|
|
|
|
set_gptimer_config(priv->pin, TIMER_MODE_PWM | TIMER_PERIOD_CNT);
|
|
set_gptimer_pwidth(priv->pin, duty);
|
|
set_gptimer_period(priv->pin, period);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bfin_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
|
{
|
|
struct bfin_pwm *priv = pwm_get_chip_data(pwm);
|
|
|
|
enable_gptimer(priv->pin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void bfin_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
|
{
|
|
struct bfin_pwm *priv = pwm_get_chip_data(pwm);
|
|
|
|
disable_gptimer(priv->pin);
|
|
}
|
|
|
|
static const struct pwm_ops bfin_pwm_ops = {
|
|
.request = bfin_pwm_request,
|
|
.free = bfin_pwm_free,
|
|
.config = bfin_pwm_config,
|
|
.enable = bfin_pwm_enable,
|
|
.disable = bfin_pwm_disable,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int bfin_pwm_probe(struct platform_device *pdev)
|
|
{
|
|
struct bfin_pwm_chip *pwm;
|
|
int ret;
|
|
|
|
pwm = devm_kzalloc(&pdev->dev, sizeof(*pwm), GFP_KERNEL);
|
|
if (!pwm) {
|
|
dev_err(&pdev->dev, "failed to allocate memory\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
platform_set_drvdata(pdev, pwm);
|
|
|
|
pwm->chip.dev = &pdev->dev;
|
|
pwm->chip.ops = &bfin_pwm_ops;
|
|
pwm->chip.base = -1;
|
|
pwm->chip.npwm = 12;
|
|
|
|
ret = pwmchip_add(&pwm->chip);
|
|
if (ret < 0) {
|
|
dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int bfin_pwm_remove(struct platform_device *pdev)
|
|
{
|
|
struct bfin_pwm_chip *pwm = platform_get_drvdata(pdev);
|
|
|
|
return pwmchip_remove(&pwm->chip);
|
|
}
|
|
|
|
static struct platform_driver bfin_pwm_driver = {
|
|
.driver = {
|
|
.name = "bfin-pwm",
|
|
},
|
|
.probe = bfin_pwm_probe,
|
|
.remove = bfin_pwm_remove,
|
|
};
|
|
|
|
module_platform_driver(bfin_pwm_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|