openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

pwm: imx: Remove redundant i.MX PWMv2 code 

The code providing functionality surpassed by the atomic PWM is not
needed anymore and hence can be removed.

Suggested-by: Stefan Agner <stefan@agner.ch>
Suggested-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Lukasz Majewski <l.majewski@majess.pl>
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Lukasz Majewski 2017-01-29 22:54:12 +01:00 committed by Thierry Reding
parent 0ca1a11a1d
commit 871985b154
1 changed files with 0 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

127
drivers/pwm/pwm-imx.c
View File

@ -53,10 +53,6 @@ struct imx_chip {
void __iomem *mmio_base;
struct pwm_chip chip;
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns);
void (*set_enable)(struct pwm_chip *chip, bool enable);
};
#define to_imx_chip(chip) container_of(chip, struct imx_chip, chip)
@ -159,95 +155,6 @@ static void imx_pwm_wait_fifo_slot(struct pwm_chip *chip,
}
}
static int imx_pwm_config_v2(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
struct imx_chip *imx = to_imx_chip(chip);
unsigned long long c;
unsigned long period_cycles, duty_cycles, prescale;
bool enable = pwm_is_enabled(pwm);
u32 cr;
/*
* i.MX PWMv2 has a 4-word sample FIFO.
* In order to avoid FIFO overflow issue, we do software reset
* to clear all sample FIFO if the controller is disabled or
* wait for a full PWM cycle to get a relinquished FIFO slot
* when the controller is enabled and the FIFO is fully loaded.
*/
if (enable)
imx_pwm_wait_fifo_slot(chip, pwm);
else
imx_pwm_sw_reset(chip);
c = clk_get_rate(imx->clk_per);
c = c * period_ns;
do_div(c, 1000000000);
period_cycles = c;
prescale = period_cycles / 0x10000 + 1;
period_cycles /= prescale;
c = (unsigned long long)period_cycles * duty_ns;
do_div(c, period_ns);
duty_cycles = c;
/*
* according to imx pwm RM, the real period value should be
* PERIOD value in PWMPR plus 2.
*/
if (period_cycles > 2)
period_cycles -= 2;
else
period_cycles = 0;
writel(duty_cycles, imx->mmio_base + MX3_PWMSAR);
writel(period_cycles, imx->mmio_base + MX3_PWMPR);
cr = MX3_PWMCR_PRESCALER(prescale) |
MX3_PWMCR_DOZEEN | MX3_PWMCR_WAITEN |
MX3_PWMCR_DBGEN | MX3_PWMCR_CLKSRC_IPG_HIGH;
if (enable)
cr |= MX3_PWMCR_EN;
writel(cr, imx->mmio_base + MX3_PWMCR);
return 0;
}
static void imx_pwm_set_enable_v2(struct pwm_chip *chip, bool enable)
{
struct imx_chip *imx = to_imx_chip(chip);
u32 val;
val = readl(imx->mmio_base + MX3_PWMCR);
if (enable)
val |= MX3_PWMCR_EN;
else
val &= ~MX3_PWMCR_EN;
writel(val, imx->mmio_base + MX3_PWMCR);
}
static int imx_pwm_config(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns)
{
struct imx_chip *imx = to_imx_chip(chip);
int ret;
ret = clk_prepare_enable(imx->clk_per);
if (ret)
return ret;
ret = imx->config(chip, pwm, duty_ns, period_ns);
clk_disable_unprepare(imx->clk_per);
return ret;
}
static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
struct pwm_state *state)
{
@ -314,29 +221,6 @@ static int imx_pwm_apply_v2(struct pwm_chip *chip, struct pwm_device *pwm,
return 0;
}
static int imx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
int ret;
ret = clk_prepare_enable(imx->clk_per);
if (ret)
return ret;
imx->set_enable(chip, true);
return 0;
}
static void imx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
{
struct imx_chip *imx = to_imx_chip(chip);
imx->set_enable(chip, false);
clk_disable_unprepare(imx->clk_per);
}
static const struct pwm_ops imx_pwm_ops_v1 = {
.enable = imx_pwm_enable_v1,
.disable = imx_pwm_disable_v1,
@ -346,16 +230,10 @@ static const struct pwm_ops imx_pwm_ops_v1 = {
static const struct pwm_ops imx_pwm_ops_v2 = {
.apply = imx_pwm_apply_v2,
.enable = imx_pwm_enable,
.disable = imx_pwm_disable,
.config = imx_pwm_config,
.owner = THIS_MODULE,
};
struct imx_pwm_data {
int (*config)(struct pwm_chip *chip,
struct pwm_device *pwm, int duty_ns, int period_ns);
void (*set_enable)(struct pwm_chip *chip, bool enable);
const struct pwm_ops *ops;
};
@ -364,8 +242,6 @@ static struct imx_pwm_data imx_pwm_data_v1 = {
};
static struct imx_pwm_data imx_pwm_data_v2 = {
.config = imx_pwm_config_v2,
.set_enable = imx_pwm_set_enable_v2,
.ops = &imx_pwm_ops_v2,
};
@ -412,9 +288,6 @@ static int imx_pwm_probe(struct platform_device *pdev)
if (IS_ERR(imx->mmio_base))
return PTR_ERR(imx->mmio_base);
imx->config = data->config;
imx->set_enable = data->set_enable;
ret = pwmchip_add(&imx->chip);
if (ret < 0)
return ret;