forked from mirrors/linux
pwm: atmel-tcb: Switch to new binding
The PWM is now a subnode of the used TCB. This is cleaner and it mainly allows to stop wasting TCB channels when only 2 or 4 PWMs are used. This also removes the atmel_tclib dependency Cc: Thierry Reding <thierry.reding@gmail.com> Cc: linux-pwm@vger.kernel.org Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Alexandre Belloni
Thierry Reding
parent
cd6720ba02
commit
061f8572a3
2 changed files with 137 additions and 107 deletions
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@ -75,7 +75,8 @@ config PWM_ATMEL_HLCDC_PWM
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config PWM_ATMEL_TCB
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tristate "Atmel TC Block PWM support"
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depends on ATMEL_TCLIB && OF
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depends on OF
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select REGMAP_MMIO
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help
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Generic PWM framework driver for Atmel Timer Counter Block.
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@ -16,13 +16,16 @@
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#include <linux/err.h>
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#include <linux/ioport.h>
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#include <linux/io.h>
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#include <linux/mfd/syscon.h>
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#include <linux/platform_device.h>
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#include <linux/pwm.h>
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#include <linux/of_device.h>
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#include <linux/of_irq.h>
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#include <linux/regmap.h>
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#include <linux/slab.h>
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#include <soc/at91/atmel_tcb.h>
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#define NPWM 6
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#define NPWM 2
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#define ATMEL_TC_ACMR_MASK (ATMEL_TC_ACPA | ATMEL_TC_ACPC | \
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ATMEL_TC_AEEVT | ATMEL_TC_ASWTRG)
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@ -48,11 +51,17 @@ struct atmel_tcb_channel {
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struct atmel_tcb_pwm_chip {
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struct pwm_chip chip;
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spinlock_t lock;
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struct atmel_tc *tc;
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u8 channel;
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u8 width;
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struct regmap *regmap;
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struct clk *clk;
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struct clk *slow_clk;
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struct atmel_tcb_pwm_device *pwms[NPWM];
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struct atmel_tcb_channel bkup[NPWM / 2];
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struct atmel_tcb_channel bkup;
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};
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const u8 atmel_tcb_divisors[] = { 2, 8, 32, 128, 0, };
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static inline struct atmel_tcb_pwm_chip *to_tcb_chip(struct pwm_chip *chip)
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{
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return container_of(chip, struct atmel_tcb_pwm_chip, chip);
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@ -74,10 +83,6 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
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{
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struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
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struct atmel_tcb_pwm_device *tcbpwm;
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struct atmel_tc *tc = tcbpwmc->tc;
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void __iomem *regs = tc->regs;
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unsigned group = pwm->hwpwm / 2;
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unsigned index = pwm->hwpwm % 2;
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unsigned cmr;
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int ret;
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@ -85,7 +90,7 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
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if (!tcbpwm)
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return -ENOMEM;
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ret = clk_prepare_enable(tc->clk[group]);
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ret = clk_prepare_enable(tcbpwmc->clk);
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if (ret) {
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devm_kfree(chip->dev, tcbpwm);
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return ret;
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@ -98,28 +103,31 @@ static int atmel_tcb_pwm_request(struct pwm_chip *chip,
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tcbpwm->div = 0;
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spin_lock(&tcbpwmc->lock);
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cmr = __raw_readl(regs + ATMEL_TC_REG(group, CMR));
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regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
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/*
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* Get init config from Timer Counter registers if
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* Timer Counter is already configured as a PWM generator.
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*/
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if (cmr & ATMEL_TC_WAVE) {
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if (index == 0)
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tcbpwm->duty =
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__raw_readl(regs + ATMEL_TC_REG(group, RA));
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if (pwm->hwpwm == 0)
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regmap_read(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, RA),
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&tcbpwm->duty);
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else
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tcbpwm->duty =
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__raw_readl(regs + ATMEL_TC_REG(group, RB));
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regmap_read(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, RB),
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&tcbpwm->duty);
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tcbpwm->div = cmr & ATMEL_TC_TCCLKS;
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tcbpwm->period = __raw_readl(regs + ATMEL_TC_REG(group, RC));
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regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
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&tcbpwm->period);
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cmr &= (ATMEL_TC_TCCLKS | ATMEL_TC_ACMR_MASK |
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ATMEL_TC_BCMR_MASK);
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} else
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cmr = 0;
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cmr |= ATMEL_TC_WAVE | ATMEL_TC_WAVESEL_UP_AUTO | ATMEL_TC_EEVT_XC0;
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__raw_writel(cmr, regs + ATMEL_TC_REG(group, CMR));
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regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
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spin_unlock(&tcbpwmc->lock);
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tcbpwmc->pwms[pwm->hwpwm] = tcbpwm;
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@ -131,9 +139,8 @@ static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
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struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);
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struct atmel_tc *tc = tcbpwmc->tc;
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clk_disable_unprepare(tc->clk[pwm->hwpwm / 2]);
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clk_disable_unprepare(tcbpwmc->clk);
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tcbpwmc->pwms[pwm->hwpwm] = NULL;
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devm_kfree(chip->dev, tcbpwm);
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}
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@ -142,10 +149,6 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
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struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);
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struct atmel_tc *tc = tcbpwmc->tc;
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void __iomem *regs = tc->regs;
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unsigned group = pwm->hwpwm / 2;
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unsigned index = pwm->hwpwm % 2;
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unsigned cmr;
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enum pwm_polarity polarity = tcbpwm->polarity;
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@ -161,10 +164,10 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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polarity = !polarity;
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spin_lock(&tcbpwmc->lock);
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cmr = __raw_readl(regs + ATMEL_TC_REG(group, CMR));
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regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
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/* flush old setting and set the new one */
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if (index == 0) {
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if (pwm->hwpwm == 0) {
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cmr &= ~ATMEL_TC_ACMR_MASK;
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if (polarity == PWM_POLARITY_INVERSED)
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cmr |= ATMEL_TC_ASWTRG_CLEAR;
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@ -178,20 +181,22 @@ static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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cmr |= ATMEL_TC_BSWTRG_SET;
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}
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__raw_writel(cmr, regs + ATMEL_TC_REG(group, CMR));
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regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
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/*
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* Use software trigger to apply the new setting.
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* If both PWM devices in this group are disabled we stop the clock.
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*/
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if (!(cmr & (ATMEL_TC_ACPC | ATMEL_TC_BCPC))) {
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__raw_writel(ATMEL_TC_SWTRG | ATMEL_TC_CLKDIS,
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regs + ATMEL_TC_REG(group, CCR));
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tcbpwmc->bkup[group].enabled = 1;
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regmap_write(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, CCR),
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ATMEL_TC_SWTRG | ATMEL_TC_CLKDIS);
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tcbpwmc->bkup.enabled = 1;
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} else {
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__raw_writel(ATMEL_TC_SWTRG, regs +
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ATMEL_TC_REG(group, CCR));
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tcbpwmc->bkup[group].enabled = 0;
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regmap_write(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, CCR),
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ATMEL_TC_SWTRG);
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tcbpwmc->bkup.enabled = 0;
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}
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spin_unlock(&tcbpwmc->lock);
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@ -201,10 +206,6 @@ static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
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struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);
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struct atmel_tc *tc = tcbpwmc->tc;
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void __iomem *regs = tc->regs;
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unsigned group = pwm->hwpwm / 2;
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unsigned index = pwm->hwpwm % 2;
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u32 cmr;
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enum pwm_polarity polarity = tcbpwm->polarity;
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@ -220,12 +221,12 @@ static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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polarity = !polarity;
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spin_lock(&tcbpwmc->lock);
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cmr = __raw_readl(regs + ATMEL_TC_REG(group, CMR));
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regmap_read(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), &cmr);
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/* flush old setting and set the new one */
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cmr &= ~ATMEL_TC_TCCLKS;
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if (index == 0) {
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if (pwm->hwpwm == 0) {
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cmr &= ~ATMEL_TC_ACMR_MASK;
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/* Set CMR flags according to given polarity */
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@ -248,7 +249,7 @@ static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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* this config till next config call.
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*/
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if (tcbpwm->duty != tcbpwm->period && tcbpwm->duty > 0) {
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if (index == 0) {
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if (pwm->hwpwm == 0) {
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if (polarity == PWM_POLARITY_INVERSED)
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cmr |= ATMEL_TC_ACPA_SET | ATMEL_TC_ACPC_CLEAR;
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else
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@ -263,19 +264,24 @@ static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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cmr |= (tcbpwm->div & ATMEL_TC_TCCLKS);
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__raw_writel(cmr, regs + ATMEL_TC_REG(group, CMR));
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regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CMR), cmr);
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if (index == 0)
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__raw_writel(tcbpwm->duty, regs + ATMEL_TC_REG(group, RA));
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if (pwm->hwpwm == 0)
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regmap_write(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, RA),
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tcbpwm->duty);
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else
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__raw_writel(tcbpwm->duty, regs + ATMEL_TC_REG(group, RB));
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regmap_write(tcbpwmc->regmap,
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ATMEL_TC_REG(tcbpwmc->channel, RB),
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tcbpwm->duty);
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__raw_writel(tcbpwm->period, regs + ATMEL_TC_REG(group, RC));
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regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, RC),
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tcbpwm->period);
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/* Use software trigger to apply the new setting */
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__raw_writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
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regs + ATMEL_TC_REG(group, CCR));
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tcbpwmc->bkup[group].enabled = 1;
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regmap_write(tcbpwmc->regmap, ATMEL_TC_REG(tcbpwmc->channel, CCR),
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ATMEL_TC_SWTRG | ATMEL_TC_CLKEN);
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tcbpwmc->bkup.enabled = 1;
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spin_unlock(&tcbpwmc->lock);
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return 0;
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}
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@ -285,15 +291,12 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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{
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struct atmel_tcb_pwm_chip *tcbpwmc = to_tcb_chip(chip);
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struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm);
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unsigned group = pwm->hwpwm / 2;
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unsigned index = pwm->hwpwm % 2;
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struct atmel_tcb_pwm_device *atcbpwm = NULL;
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struct atmel_tc *tc = tcbpwmc->tc;
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int i;
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int slowclk = 0;
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unsigned period;
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unsigned duty;
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unsigned rate = clk_get_rate(tc->clk[group]);
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unsigned rate = clk_get_rate(tcbpwmc->clk);
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unsigned long long min;
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unsigned long long max;
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@ -301,13 +304,13 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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* Find best clk divisor:
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* the smallest divisor which can fulfill the period_ns requirements.
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*/
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for (i = 0; i < 5; ++i) {
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if (atmel_tc_divisors[i] == 0) {
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for (i = 0; i < ARRAY_SIZE(atmel_tcb_divisors); ++i) {
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if (atmel_tcb_divisors[i] == 0) {
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slowclk = i;
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continue;
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}
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min = div_u64((u64)NSEC_PER_SEC * atmel_tc_divisors[i], rate);
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max = min << tc->tcb_config->counter_width;
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min = div_u64((u64)NSEC_PER_SEC * atmel_tcb_divisors[i], rate);
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max = min << tcbpwmc->width;
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if (max >= period_ns)
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break;
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}
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@ -316,11 +319,11 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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* If none of the divisor are small enough to represent period_ns
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* take slow clock (32KHz).
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*/
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if (i == 5) {
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if (i == ARRAY_SIZE(atmel_tcb_divisors)) {
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i = slowclk;
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rate = clk_get_rate(tc->slow_clk);
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rate = clk_get_rate(tcbpwmc->slow_clk);
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min = div_u64(NSEC_PER_SEC, rate);
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max = min << tc->tcb_config->counter_width;
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max = min << tcbpwmc->width;
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/* If period is too big return ERANGE error */
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if (max < period_ns)
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@ -330,17 +333,13 @@ static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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duty = div_u64(duty_ns, min);
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period = div_u64(period_ns, min);
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if (index == 0)
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atcbpwm = tcbpwmc->pwms[pwm->hwpwm + 1];
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if (pwm->hwpwm == 0)
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atcbpwm = tcbpwmc->pwms[1];
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else
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atcbpwm = tcbpwmc->pwms[pwm->hwpwm - 1];
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atcbpwm = tcbpwmc->pwms[0];
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/*
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* PWM devices provided by TCB driver are grouped by 2:
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* - group 0: PWM 0 & 1
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* - group 1: PWM 2 & 3
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* - group 2: PWM 4 & 5
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*
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* PWM devices provided by the TCB driver are grouped by 2.
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* PWM devices in a given group must be configured with the
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* same period_ns.
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*
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@ -376,32 +375,63 @@ static const struct pwm_ops atmel_tcb_pwm_ops = {
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.owner = THIS_MODULE,
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};
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static struct atmel_tcb_config tcb_rm9200_config = {
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.counter_width = 16,
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};
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static struct atmel_tcb_config tcb_sam9x5_config = {
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.counter_width = 32,
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};
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static const struct of_device_id atmel_tcb_of_match[] = {
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{ .compatible = "atmel,at91rm9200-tcb", .data = &tcb_rm9200_config, },
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{ .compatible = "atmel,at91sam9x5-tcb", .data = &tcb_sam9x5_config, },
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{ /* sentinel */ }
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};
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static int atmel_tcb_pwm_probe(struct platform_device *pdev)
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{
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const struct of_device_id *match;
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struct atmel_tcb_pwm_chip *tcbpwm;
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const struct atmel_tcb_config *config;
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struct device_node *np = pdev->dev.of_node;
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struct atmel_tc *tc;
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struct regmap *regmap;
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struct clk *clk;
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struct clk *slow_clk;
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char clk_name[] = "t0_clk";
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int err;
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int tcblock;
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int channel;
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err = of_property_read_u32(np, "tc-block", &tcblock);
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err = of_property_read_u32(np, "reg", &channel);
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if (err < 0) {
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dev_err(&pdev->dev,
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"failed to get Timer Counter Block number from device tree (error: %d)\n",
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"failed to get Timer Counter Block channel from device tree (error: %d)\n",
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err);
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return err;
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}
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tc = atmel_tc_alloc(tcblock);
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if (tc == NULL) {
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dev_err(&pdev->dev, "failed to allocate Timer Counter Block\n");
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return -ENOMEM;
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}
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regmap = syscon_node_to_regmap(np->parent);
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if (IS_ERR(regmap))
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return PTR_ERR(regmap);
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slow_clk = of_clk_get_by_name(np->parent, "slow_clk");
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if (IS_ERR(slow_clk))
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return PTR_ERR(slow_clk);
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clk_name[1] += channel;
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clk = of_clk_get_by_name(np->parent, clk_name);
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if (IS_ERR(clk))
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clk = of_clk_get_by_name(np->parent, "t0_clk");
|
||||
if (IS_ERR(clk))
|
||||
return PTR_ERR(clk);
|
||||
|
||||
match = of_match_node(atmel_tcb_of_match, np->parent);
|
||||
config = match->data;
|
||||
|
||||
tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL);
|
||||
if (tcbpwm == NULL) {
|
||||
err = -ENOMEM;
|
||||
goto err_free_tc;
|
||||
goto err_slow_clk;
|
||||
}
|
||||
|
||||
tcbpwm->chip.dev = &pdev->dev;
|
||||
|
|
@ -410,11 +440,15 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
|
|||
tcbpwm->chip.of_pwm_n_cells = 3;
|
||||
tcbpwm->chip.base = -1;
|
||||
tcbpwm->chip.npwm = NPWM;
|
||||
tcbpwm->tc = tc;
|
||||
tcbpwm->channel = channel;
|
||||
tcbpwm->regmap = regmap;
|
||||
tcbpwm->clk = clk;
|
||||
tcbpwm->slow_clk = slow_clk;
|
||||
tcbpwm->width = config->counter_width;
|
||||
|
||||
err = clk_prepare_enable(tc->slow_clk);
|
||||
err = clk_prepare_enable(slow_clk);
|
||||
if (err)
|
||||
goto err_free_tc;
|
||||
goto err_slow_clk;
|
||||
|
||||
spin_lock_init(&tcbpwm->lock);
|
||||
|
||||
|
|
@ -427,10 +461,10 @@ static int atmel_tcb_pwm_probe(struct platform_device *pdev)
|
|||
return 0;
|
||||
|
||||
err_disable_clk:
|
||||
clk_disable_unprepare(tcbpwm->tc->slow_clk);
|
||||
clk_disable_unprepare(tcbpwm->slow_clk);
|
||||
|
||||
err_free_tc:
|
||||
atmel_tc_free(tc);
|
||||
err_slow_clk:
|
||||
clk_put(slow_clk);
|
||||
|
||||
return err;
|
||||
}
|
||||
|
|
@ -440,14 +474,14 @@ static int atmel_tcb_pwm_remove(struct platform_device *pdev)
|
|||
struct atmel_tcb_pwm_chip *tcbpwm = platform_get_drvdata(pdev);
|
||||
int err;
|
||||
|
||||
clk_disable_unprepare(tcbpwm->tc->slow_clk);
|
||||
clk_disable_unprepare(tcbpwm->slow_clk);
|
||||
clk_put(tcbpwm->slow_clk);
|
||||
clk_put(tcbpwm->clk);
|
||||
|
||||
err = pwmchip_remove(&tcbpwm->chip);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
atmel_tc_free(tcbpwm->tc);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -461,38 +495,33 @@ MODULE_DEVICE_TABLE(of, atmel_tcb_pwm_dt_ids);
|
|||
static int atmel_tcb_pwm_suspend(struct device *dev)
|
||||
{
|
||||
struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
|
||||
void __iomem *base = tcbpwm->tc->regs;
|
||||
int i;
|
||||
struct atmel_tcb_channel *chan = &tcbpwm->bkup;
|
||||
unsigned int channel = tcbpwm->channel;
|
||||
|
||||
for (i = 0; i < (NPWM / 2); i++) {
|
||||
struct atmel_tcb_channel *chan = &tcbpwm->bkup[i];
|
||||
regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), &chan->cmr);
|
||||
regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), &chan->ra);
|
||||
regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), &chan->rb);
|
||||
regmap_read(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), &chan->rc);
|
||||
|
||||
chan->cmr = readl(base + ATMEL_TC_REG(i, CMR));
|
||||
chan->ra = readl(base + ATMEL_TC_REG(i, RA));
|
||||
chan->rb = readl(base + ATMEL_TC_REG(i, RB));
|
||||
chan->rc = readl(base + ATMEL_TC_REG(i, RC));
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int atmel_tcb_pwm_resume(struct device *dev)
|
||||
{
|
||||
struct atmel_tcb_pwm_chip *tcbpwm = dev_get_drvdata(dev);
|
||||
void __iomem *base = tcbpwm->tc->regs;
|
||||
int i;
|
||||
struct atmel_tcb_channel *chan = &tcbpwm->bkup;
|
||||
unsigned int channel = tcbpwm->channel;
|
||||
|
||||
for (i = 0; i < (NPWM / 2); i++) {
|
||||
struct atmel_tcb_channel *chan = &tcbpwm->bkup[i];
|
||||
regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, CMR), chan->cmr);
|
||||
regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RA), chan->ra);
|
||||
regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RB), chan->rb);
|
||||
regmap_write(tcbpwm->regmap, ATMEL_TC_REG(channel, RC), chan->rc);
|
||||
|
||||
if (chan->enabled)
|
||||
regmap_write(tcbpwm->regmap,
|
||||
ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
|
||||
ATMEL_TC_REG(channel, CCR));
|
||||
|
||||
writel(chan->cmr, base + ATMEL_TC_REG(i, CMR));
|
||||
writel(chan->ra, base + ATMEL_TC_REG(i, RA));
|
||||
writel(chan->rb, base + ATMEL_TC_REG(i, RB));
|
||||
writel(chan->rc, base + ATMEL_TC_REG(i, RC));
|
||||
if (chan->enabled) {
|
||||
writel(ATMEL_TC_CLKEN | ATMEL_TC_SWTRG,
|
||||
base + ATMEL_TC_REG(i, CCR));
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue