Lines Matching +full:tcb +full:- +full:pwm
1 // SPDX-License-Identifier: GPL-2.0-only
20 #include <linux/pwm.h>
34 enum pwm_polarity polarity; /* PWM polarity */
35 unsigned div; /* PWM clock divider */
36 unsigned duty; /* PWM duty expressed in clk cycles */
37 unsigned period; /* PWM period expressed in clk cycles */
62 struct pwm_device *pwm, in atmel_tcb_pwm_set_polarity() argument
65 struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); in atmel_tcb_pwm_set_polarity()
67 tcbpwm->polarity = polarity; in atmel_tcb_pwm_set_polarity()
73 struct pwm_device *pwm) in atmel_tcb_pwm_request() argument
77 struct atmel_tc *tc = tcbpwmc->tc; in atmel_tcb_pwm_request()
78 void __iomem *regs = tc->regs; in atmel_tcb_pwm_request()
79 unsigned group = pwm->hwpwm / 2; in atmel_tcb_pwm_request()
80 unsigned index = pwm->hwpwm % 2; in atmel_tcb_pwm_request()
84 tcbpwm = devm_kzalloc(chip->dev, sizeof(*tcbpwm), GFP_KERNEL); in atmel_tcb_pwm_request()
86 return -ENOMEM; in atmel_tcb_pwm_request()
88 ret = clk_prepare_enable(tc->clk[group]); in atmel_tcb_pwm_request()
90 devm_kfree(chip->dev, tcbpwm); in atmel_tcb_pwm_request()
94 pwm_set_chip_data(pwm, tcbpwm); in atmel_tcb_pwm_request()
95 tcbpwm->polarity = PWM_POLARITY_NORMAL; in atmel_tcb_pwm_request()
96 tcbpwm->duty = 0; in atmel_tcb_pwm_request()
97 tcbpwm->period = 0; in atmel_tcb_pwm_request()
98 tcbpwm->div = 0; in atmel_tcb_pwm_request()
100 spin_lock(&tcbpwmc->lock); in atmel_tcb_pwm_request()
104 * Timer Counter is already configured as a PWM generator. in atmel_tcb_pwm_request()
108 tcbpwm->duty = in atmel_tcb_pwm_request()
111 tcbpwm->duty = in atmel_tcb_pwm_request()
114 tcbpwm->div = cmr & ATMEL_TC_TCCLKS; in atmel_tcb_pwm_request()
115 tcbpwm->period = __raw_readl(regs + ATMEL_TC_REG(group, RC)); in atmel_tcb_pwm_request()
123 spin_unlock(&tcbpwmc->lock); in atmel_tcb_pwm_request()
125 tcbpwmc->pwms[pwm->hwpwm] = tcbpwm; in atmel_tcb_pwm_request()
130 static void atmel_tcb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) in atmel_tcb_pwm_free() argument
133 struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); in atmel_tcb_pwm_free()
134 struct atmel_tc *tc = tcbpwmc->tc; in atmel_tcb_pwm_free()
136 clk_disable_unprepare(tc->clk[pwm->hwpwm / 2]); in atmel_tcb_pwm_free()
137 tcbpwmc->pwms[pwm->hwpwm] = NULL; in atmel_tcb_pwm_free()
138 devm_kfree(chip->dev, tcbpwm); in atmel_tcb_pwm_free()
141 static void atmel_tcb_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm) in atmel_tcb_pwm_disable() argument
144 struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); in atmel_tcb_pwm_disable()
145 struct atmel_tc *tc = tcbpwmc->tc; in atmel_tcb_pwm_disable()
146 void __iomem *regs = tc->regs; in atmel_tcb_pwm_disable()
147 unsigned group = pwm->hwpwm / 2; in atmel_tcb_pwm_disable()
148 unsigned index = pwm->hwpwm % 2; in atmel_tcb_pwm_disable()
150 enum pwm_polarity polarity = tcbpwm->polarity; in atmel_tcb_pwm_disable()
155 * - set output to high if PWM_POLARITY_INVERSED in atmel_tcb_pwm_disable()
156 * - set output to low if PWM_POLARITY_NORMAL in atmel_tcb_pwm_disable()
160 if (tcbpwm->duty == 0) in atmel_tcb_pwm_disable()
163 spin_lock(&tcbpwmc->lock); in atmel_tcb_pwm_disable()
185 * If both PWM devices in this group are disabled we stop the clock. in atmel_tcb_pwm_disable()
190 tcbpwmc->bkup[group].enabled = 1; in atmel_tcb_pwm_disable()
194 tcbpwmc->bkup[group].enabled = 0; in atmel_tcb_pwm_disable()
197 spin_unlock(&tcbpwmc->lock); in atmel_tcb_pwm_disable()
200 static int atmel_tcb_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm) in atmel_tcb_pwm_enable() argument
203 struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); in atmel_tcb_pwm_enable()
204 struct atmel_tc *tc = tcbpwmc->tc; in atmel_tcb_pwm_enable()
205 void __iomem *regs = tc->regs; in atmel_tcb_pwm_enable()
206 unsigned group = pwm->hwpwm / 2; in atmel_tcb_pwm_enable()
207 unsigned index = pwm->hwpwm % 2; in atmel_tcb_pwm_enable()
209 enum pwm_polarity polarity = tcbpwm->polarity; in atmel_tcb_pwm_enable()
214 * - set output to high if PWM_POLARITY_INVERSED in atmel_tcb_pwm_enable()
215 * - set output to low if PWM_POLARITY_NORMAL in atmel_tcb_pwm_enable()
219 if (tcbpwm->duty == 0) in atmel_tcb_pwm_enable()
222 spin_lock(&tcbpwmc->lock); in atmel_tcb_pwm_enable()
250 if (tcbpwm->duty != tcbpwm->period && tcbpwm->duty > 0) { in atmel_tcb_pwm_enable()
264 cmr |= (tcbpwm->div & ATMEL_TC_TCCLKS); in atmel_tcb_pwm_enable()
269 __raw_writel(tcbpwm->duty, regs + ATMEL_TC_REG(group, RA)); in atmel_tcb_pwm_enable()
271 __raw_writel(tcbpwm->duty, regs + ATMEL_TC_REG(group, RB)); in atmel_tcb_pwm_enable()
273 __raw_writel(tcbpwm->period, regs + ATMEL_TC_REG(group, RC)); in atmel_tcb_pwm_enable()
278 tcbpwmc->bkup[group].enabled = 1; in atmel_tcb_pwm_enable()
279 spin_unlock(&tcbpwmc->lock); in atmel_tcb_pwm_enable()
283 static int atmel_tcb_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm, in atmel_tcb_pwm_config() argument
287 struct atmel_tcb_pwm_device *tcbpwm = pwm_get_chip_data(pwm); in atmel_tcb_pwm_config()
288 unsigned group = pwm->hwpwm / 2; in atmel_tcb_pwm_config()
289 unsigned index = pwm->hwpwm % 2; in atmel_tcb_pwm_config()
291 struct atmel_tc *tc = tcbpwmc->tc; in atmel_tcb_pwm_config()
296 unsigned rate = clk_get_rate(tc->clk[group]); in atmel_tcb_pwm_config()
310 max = min << tc->tcb_config->counter_width; in atmel_tcb_pwm_config()
321 rate = clk_get_rate(tc->slow_clk); in atmel_tcb_pwm_config()
323 max = min << tc->tcb_config->counter_width; in atmel_tcb_pwm_config()
327 return -ERANGE; in atmel_tcb_pwm_config()
334 atcbpwm = tcbpwmc->pwms[pwm->hwpwm + 1]; in atmel_tcb_pwm_config()
336 atcbpwm = tcbpwmc->pwms[pwm->hwpwm - 1]; in atmel_tcb_pwm_config()
339 * PWM devices provided by TCB driver are grouped by 2: in atmel_tcb_pwm_config()
340 * - group 0: PWM 0 & 1 in atmel_tcb_pwm_config()
341 * - group 1: PWM 2 & 3 in atmel_tcb_pwm_config()
342 * - group 2: PWM 4 & 5 in atmel_tcb_pwm_config()
344 * PWM devices in a given group must be configured with the in atmel_tcb_pwm_config()
347 * We're checking the period value of the second PWM device in atmel_tcb_pwm_config()
350 if ((atcbpwm && atcbpwm->duty > 0 && in atmel_tcb_pwm_config()
351 atcbpwm->duty != atcbpwm->period) && in atmel_tcb_pwm_config()
352 (atcbpwm->div != i || atcbpwm->period != period)) { in atmel_tcb_pwm_config()
353 dev_err(chip->dev, in atmel_tcb_pwm_config()
354 "failed to configure period_ns: PWM group already configured with a different value\n"); in atmel_tcb_pwm_config()
355 return -EINVAL; in atmel_tcb_pwm_config()
358 tcbpwm->period = period; in atmel_tcb_pwm_config()
359 tcbpwm->div = i; in atmel_tcb_pwm_config()
360 tcbpwm->duty = duty; in atmel_tcb_pwm_config()
362 /* If the PWM is enabled, call enable to apply the new conf */ in atmel_tcb_pwm_config()
363 if (pwm_is_enabled(pwm)) in atmel_tcb_pwm_config()
364 atmel_tcb_pwm_enable(chip, pwm); in atmel_tcb_pwm_config()
382 struct device_node *np = pdev->dev.of_node; in atmel_tcb_pwm_probe()
387 err = of_property_read_u32(np, "tc-block", &tcblock); in atmel_tcb_pwm_probe()
389 dev_err(&pdev->dev, in atmel_tcb_pwm_probe()
397 dev_err(&pdev->dev, "failed to allocate Timer Counter Block\n"); in atmel_tcb_pwm_probe()
398 return -ENOMEM; in atmel_tcb_pwm_probe()
401 tcbpwm = devm_kzalloc(&pdev->dev, sizeof(*tcbpwm), GFP_KERNEL); in atmel_tcb_pwm_probe()
403 err = -ENOMEM; in atmel_tcb_pwm_probe()
407 tcbpwm->chip.dev = &pdev->dev; in atmel_tcb_pwm_probe()
408 tcbpwm->chip.ops = &atmel_tcb_pwm_ops; in atmel_tcb_pwm_probe()
409 tcbpwm->chip.of_xlate = of_pwm_xlate_with_flags; in atmel_tcb_pwm_probe()
410 tcbpwm->chip.of_pwm_n_cells = 3; in atmel_tcb_pwm_probe()
411 tcbpwm->chip.base = -1; in atmel_tcb_pwm_probe()
412 tcbpwm->chip.npwm = NPWM; in atmel_tcb_pwm_probe()
413 tcbpwm->tc = tc; in atmel_tcb_pwm_probe()
415 err = clk_prepare_enable(tc->slow_clk); in atmel_tcb_pwm_probe()
419 spin_lock_init(&tcbpwm->lock); in atmel_tcb_pwm_probe()
421 err = pwmchip_add(&tcbpwm->chip); in atmel_tcb_pwm_probe()
430 clk_disable_unprepare(tcbpwm->tc->slow_clk); in atmel_tcb_pwm_probe()
443 clk_disable_unprepare(tcbpwm->tc->slow_clk); in atmel_tcb_pwm_remove()
445 err = pwmchip_remove(&tcbpwm->chip); in atmel_tcb_pwm_remove()
449 atmel_tc_free(tcbpwm->tc); in atmel_tcb_pwm_remove()
455 { .compatible = "atmel,tcb-pwm", },
464 void __iomem *base = tcbpwm->tc->regs; in atmel_tcb_pwm_suspend()
468 struct atmel_tcb_channel *chan = &tcbpwm->bkup[i]; in atmel_tcb_pwm_suspend()
470 chan->cmr = readl(base + ATMEL_TC_REG(i, CMR)); in atmel_tcb_pwm_suspend()
471 chan->ra = readl(base + ATMEL_TC_REG(i, RA)); in atmel_tcb_pwm_suspend()
472 chan->rb = readl(base + ATMEL_TC_REG(i, RB)); in atmel_tcb_pwm_suspend()
473 chan->rc = readl(base + ATMEL_TC_REG(i, RC)); in atmel_tcb_pwm_suspend()
481 void __iomem *base = tcbpwm->tc->regs; in atmel_tcb_pwm_resume()
485 struct atmel_tcb_channel *chan = &tcbpwm->bkup[i]; in atmel_tcb_pwm_resume()
487 writel(chan->cmr, base + ATMEL_TC_REG(i, CMR)); in atmel_tcb_pwm_resume()
488 writel(chan->ra, base + ATMEL_TC_REG(i, RA)); in atmel_tcb_pwm_resume()
489 writel(chan->rb, base + ATMEL_TC_REG(i, RB)); in atmel_tcb_pwm_resume()
490 writel(chan->rc, base + ATMEL_TC_REG(i, RC)); in atmel_tcb_pwm_resume()
491 if (chan->enabled) { in atmel_tcb_pwm_resume()
505 .name = "atmel-tcb-pwm",