Lines Matching +full:s3c6400 +full:- +full:pwm
1 // SPDX-License-Identifier: GPL-2.0-only
5 * Ben Dooks <ben@simtec.co.uk>, <ben-linux@fluff.org>
9 * PWM driver for Samsung SoCs
21 #include <linux/pwm.h>
59 * struct samsung_pwm_channel - private data of PWM channel
71 * struct samsung_pwm_chip - private data of PWM chip
72 * @chip: generic PWM chip
74 * @inverter_mask: inverter status for all channels - one bit per channel
75 * @disabled_mask: disabled status for all channels - one bit per channel
76 * @base: base address of mapped PWM registers
97 * PWM block is shared between pwm-samsung and samsung_pwm_timer drivers
103 * because all the supported SoCs contain only one instance of the PWM
123 struct pwm_device *pwm) in __pwm_samsung_manual_update() argument
125 unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm); in __pwm_samsung_manual_update()
128 tcon = readl(our_chip->base + REG_TCON); in __pwm_samsung_manual_update()
130 writel(tcon, our_chip->base + REG_TCON); in __pwm_samsung_manual_update()
133 writel(tcon, our_chip->base + REG_TCON); in __pwm_samsung_manual_update()
144 bits = (fls(divisor) - 1) - our_chip->variant.div_base; in pwm_samsung_set_divisor()
148 reg = readl(our_chip->base + REG_TCFG1); in pwm_samsung_set_divisor()
151 writel(reg, our_chip->base + REG_TCFG1); in pwm_samsung_set_divisor()
158 struct samsung_pwm_variant *variant = &our_chip->variant; in pwm_samsung_is_tdiv()
161 reg = readl(our_chip->base + REG_TCFG1); in pwm_samsung_is_tdiv()
165 return (BIT(reg) & variant->tclk_mask) == 0; in pwm_samsung_is_tdiv()
174 rate = clk_get_rate(our_chip->base_clk); in pwm_samsung_get_tin_rate()
176 reg = readl(our_chip->base + REG_TCFG0); in pwm_samsung_get_tin_rate()
187 struct samsung_pwm_variant *variant = &our_chip->variant; in pwm_samsung_calc_tin()
193 clk = (chan < 2) ? our_chip->tclk0 : our_chip->tclk1; in pwm_samsung_calc_tin()
200 dev_warn(our_chip->chip.dev, in pwm_samsung_calc_tin()
201 "tclk of PWM %d is inoperational, using tdiv\n", chan); in pwm_samsung_calc_tin()
205 dev_dbg(our_chip->chip.dev, "tin parent at %lu\n", rate); in pwm_samsung_calc_tin()
208 * Compare minimum PWM frequency that can be achieved with possible in pwm_samsung_calc_tin()
212 if (variant->bits < 32) { in pwm_samsung_calc_tin()
214 for (div = variant->div_base; div < 4; ++div) in pwm_samsung_calc_tin()
215 if ((rate >> (variant->bits + div)) < freq) in pwm_samsung_calc_tin()
222 div = variant->div_base; in pwm_samsung_calc_tin()
230 static int pwm_samsung_request(struct pwm_chip *chip, struct pwm_device *pwm) in pwm_samsung_request() argument
234 if (!(our_chip->variant.output_mask & BIT(pwm->hwpwm))) { in pwm_samsung_request()
235 dev_warn(chip->dev, in pwm_samsung_request()
236 "tried to request PWM channel %d without output\n", in pwm_samsung_request()
237 pwm->hwpwm); in pwm_samsung_request()
238 return -EINVAL; in pwm_samsung_request()
241 memset(&our_chip->channel[pwm->hwpwm], 0, sizeof(our_chip->channel[pwm->hwpwm])); in pwm_samsung_request()
246 static int pwm_samsung_enable(struct pwm_chip *chip, struct pwm_device *pwm) in pwm_samsung_enable() argument
249 unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm); in pwm_samsung_enable()
255 tcon = readl(our_chip->base + REG_TCON); in pwm_samsung_enable()
259 writel(tcon, our_chip->base + REG_TCON); in pwm_samsung_enable()
263 writel(tcon, our_chip->base + REG_TCON); in pwm_samsung_enable()
265 our_chip->disabled_mask &= ~BIT(pwm->hwpwm); in pwm_samsung_enable()
272 static void pwm_samsung_disable(struct pwm_chip *chip, struct pwm_device *pwm) in pwm_samsung_disable() argument
275 unsigned int tcon_chan = to_tcon_channel(pwm->hwpwm); in pwm_samsung_disable()
281 tcon = readl(our_chip->base + REG_TCON); in pwm_samsung_disable()
283 writel(tcon, our_chip->base + REG_TCON); in pwm_samsung_disable()
286 * In case the PWM is at 100% duty cycle, force a manual in pwm_samsung_disable()
289 if (readl(our_chip->base + REG_TCMPB(pwm->hwpwm)) == (u32)-1U) in pwm_samsung_disable()
290 __pwm_samsung_manual_update(our_chip, pwm); in pwm_samsung_disable()
292 our_chip->disabled_mask |= BIT(pwm->hwpwm); in pwm_samsung_disable()
298 struct pwm_device *pwm) in pwm_samsung_manual_update() argument
304 __pwm_samsung_manual_update(our_chip, pwm); in pwm_samsung_manual_update()
309 static int __pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm, in __pwm_samsung_config() argument
313 struct samsung_pwm_channel *chan = &our_chip->channel[pwm->hwpwm]; in __pwm_samsung_config()
314 u32 tin_ns = chan->tin_ns, tcnt, tcmp, oldtcmp; in __pwm_samsung_config()
316 tcnt = readl(our_chip->base + REG_TCNTB(pwm->hwpwm)); in __pwm_samsung_config()
317 oldtcmp = readl(our_chip->base + REG_TCMPB(pwm->hwpwm)); in __pwm_samsung_config()
322 /* Check to see if we are changing the clock rate of the PWM. */ in __pwm_samsung_config()
323 if (chan->period_ns != period_ns || force_period) { in __pwm_samsung_config()
329 dev_dbg(our_chip->chip.dev, "duty_ns=%d, period_ns=%d (%u)\n", in __pwm_samsung_config()
332 tin_rate = pwm_samsung_calc_tin(our_chip, pwm->hwpwm, period); in __pwm_samsung_config()
334 dev_dbg(our_chip->chip.dev, "tin_rate=%lu\n", tin_rate); in __pwm_samsung_config()
342 return -ERANGE; in __pwm_samsung_config()
351 tcmp = tcnt - tcmp; in __pwm_samsung_config()
354 --tcnt; in __pwm_samsung_config()
355 /* -1UL will give 100% duty. */ in __pwm_samsung_config()
356 --tcmp; in __pwm_samsung_config()
358 dev_dbg(our_chip->chip.dev, in __pwm_samsung_config()
361 /* Update PWM registers. */ in __pwm_samsung_config()
362 writel(tcnt, our_chip->base + REG_TCNTB(pwm->hwpwm)); in __pwm_samsung_config()
363 writel(tcmp, our_chip->base + REG_TCMPB(pwm->hwpwm)); in __pwm_samsung_config()
366 * In case the PWM is currently at 100% duty cycle, force a manual in __pwm_samsung_config()
367 * update to prevent the signal staying high if the PWM is disabled in __pwm_samsung_config()
370 if (oldtcmp == (u32) -1) { in __pwm_samsung_config()
371 dev_dbg(our_chip->chip.dev, "Forcing manual update"); in __pwm_samsung_config()
372 pwm_samsung_manual_update(our_chip, pwm); in __pwm_samsung_config()
375 chan->period_ns = period_ns; in __pwm_samsung_config()
376 chan->tin_ns = tin_ns; in __pwm_samsung_config()
377 chan->duty_ns = duty_ns; in __pwm_samsung_config()
382 static int pwm_samsung_config(struct pwm_chip *chip, struct pwm_device *pwm, in pwm_samsung_config() argument
385 return __pwm_samsung_config(chip, pwm, duty_ns, period_ns, false); in pwm_samsung_config()
397 tcon = readl(our_chip->base + REG_TCON); in pwm_samsung_set_invert()
400 our_chip->inverter_mask |= BIT(channel); in pwm_samsung_set_invert()
403 our_chip->inverter_mask &= ~BIT(channel); in pwm_samsung_set_invert()
407 writel(tcon, our_chip->base + REG_TCON); in pwm_samsung_set_invert()
413 struct pwm_device *pwm, in pwm_samsung_set_polarity() argument
420 pwm_samsung_set_invert(our_chip, pwm->hwpwm, invert); in pwm_samsung_set_polarity()
425 static int pwm_samsung_apply(struct pwm_chip *chip, struct pwm_device *pwm, in pwm_samsung_apply() argument
428 int err, enabled = pwm->state.enabled; in pwm_samsung_apply()
430 if (state->polarity != pwm->state.polarity) { in pwm_samsung_apply()
432 pwm_samsung_disable(chip, pwm); in pwm_samsung_apply()
436 err = pwm_samsung_set_polarity(chip, pwm, state->polarity); in pwm_samsung_apply()
441 if (!state->enabled) { in pwm_samsung_apply()
443 pwm_samsung_disable(chip, pwm); in pwm_samsung_apply()
453 if (state->period > NSEC_PER_SEC) in pwm_samsung_apply()
454 return -ERANGE; in pwm_samsung_apply()
456 err = pwm_samsung_config(chip, pwm, state->duty_cycle, state->period); in pwm_samsung_apply()
460 if (!pwm->state.enabled) in pwm_samsung_apply()
461 err = pwm_samsung_enable(chip, pwm); in pwm_samsung_apply()
501 { .compatible = "samsung,s3c2410-pwm", .data = &s3c24xx_variant },
502 { .compatible = "samsung,s3c6400-pwm", .data = &s3c64xx_variant },
503 { .compatible = "samsung,s5p6440-pwm", .data = &s5p64x0_variant },
504 { .compatible = "samsung,s5pc100-pwm", .data = &s5pc100_variant },
505 { .compatible = "samsung,exynos4210-pwm", .data = &s5p64x0_variant },
512 struct device_node *np = our_chip->chip.dev->of_node; in pwm_samsung_parse_dt()
520 return -ENODEV; in pwm_samsung_parse_dt()
522 memcpy(&our_chip->variant, match->data, sizeof(our_chip->variant)); in pwm_samsung_parse_dt()
524 of_property_for_each_u32(np, "samsung,pwm-outputs", prop, cur, val) { in pwm_samsung_parse_dt()
526 dev_err(our_chip->chip.dev, in pwm_samsung_parse_dt()
527 "%s: invalid channel index in samsung,pwm-outputs property\n", in pwm_samsung_parse_dt()
531 our_chip->variant.output_mask |= BIT(val); in pwm_samsung_parse_dt()
539 return -ENODEV; in pwm_samsung_parse_dt()
545 struct device *dev = &pdev->dev; in pwm_samsung_probe()
550 our_chip = devm_kzalloc(&pdev->dev, sizeof(*our_chip), GFP_KERNEL); in pwm_samsung_probe()
552 return -ENOMEM; in pwm_samsung_probe()
554 our_chip->chip.dev = &pdev->dev; in pwm_samsung_probe()
555 our_chip->chip.ops = &pwm_samsung_ops; in pwm_samsung_probe()
556 our_chip->chip.npwm = SAMSUNG_PWM_NUM; in pwm_samsung_probe()
557 our_chip->inverter_mask = BIT(SAMSUNG_PWM_NUM) - 1; in pwm_samsung_probe()
559 if (IS_ENABLED(CONFIG_OF) && pdev->dev.of_node) { in pwm_samsung_probe()
564 if (!pdev->dev.platform_data) { in pwm_samsung_probe()
565 dev_err(&pdev->dev, "no platform data specified\n"); in pwm_samsung_probe()
566 return -EINVAL; in pwm_samsung_probe()
569 memcpy(&our_chip->variant, pdev->dev.platform_data, in pwm_samsung_probe()
570 sizeof(our_chip->variant)); in pwm_samsung_probe()
573 our_chip->base = devm_platform_ioremap_resource(pdev, 0); in pwm_samsung_probe()
574 if (IS_ERR(our_chip->base)) in pwm_samsung_probe()
575 return PTR_ERR(our_chip->base); in pwm_samsung_probe()
577 our_chip->base_clk = devm_clk_get(&pdev->dev, "timers"); in pwm_samsung_probe()
578 if (IS_ERR(our_chip->base_clk)) { in pwm_samsung_probe()
580 return PTR_ERR(our_chip->base_clk); in pwm_samsung_probe()
583 ret = clk_prepare_enable(our_chip->base_clk); in pwm_samsung_probe()
590 if (our_chip->variant.output_mask & BIT(chan)) in pwm_samsung_probe()
594 our_chip->tclk0 = devm_clk_get(&pdev->dev, "pwm-tclk0"); in pwm_samsung_probe()
595 our_chip->tclk1 = devm_clk_get(&pdev->dev, "pwm-tclk1"); in pwm_samsung_probe()
599 ret = pwmchip_add(&our_chip->chip); in pwm_samsung_probe()
601 dev_err(dev, "failed to register PWM chip\n"); in pwm_samsung_probe()
602 clk_disable_unprepare(our_chip->base_clk); in pwm_samsung_probe()
607 clk_get_rate(our_chip->base_clk), in pwm_samsung_probe()
608 !IS_ERR(our_chip->tclk0) ? clk_get_rate(our_chip->tclk0) : 0, in pwm_samsung_probe()
609 !IS_ERR(our_chip->tclk1) ? clk_get_rate(our_chip->tclk1) : 0); in pwm_samsung_probe()
618 pwmchip_remove(&our_chip->chip); in pwm_samsung_remove()
620 clk_disable_unprepare(our_chip->base_clk); in pwm_samsung_remove()
626 struct pwm_chip *chip = &our_chip->chip; in pwm_samsung_resume()
630 struct pwm_device *pwm = &chip->pwms[i]; in pwm_samsung_resume() local
631 struct samsung_pwm_channel *chan = &our_chip->channel[i]; in pwm_samsung_resume()
633 if (!test_bit(PWMF_REQUESTED, &pwm->flags)) in pwm_samsung_resume()
636 if (our_chip->variant.output_mask & BIT(i)) in pwm_samsung_resume()
638 our_chip->inverter_mask & BIT(i)); in pwm_samsung_resume()
640 if (chan->period_ns) { in pwm_samsung_resume()
641 __pwm_samsung_config(chip, pwm, chan->duty_ns, in pwm_samsung_resume()
642 chan->period_ns, true); in pwm_samsung_resume()
643 /* needed to make PWM disable work on Odroid-XU3 */ in pwm_samsung_resume()
644 pwm_samsung_manual_update(our_chip, pwm); in pwm_samsung_resume()
647 if (our_chip->disabled_mask & BIT(i)) in pwm_samsung_resume()
648 pwm_samsung_disable(chip, pwm); in pwm_samsung_resume()
650 pwm_samsung_enable(chip, pwm); in pwm_samsung_resume()
660 .name = "samsung-pwm",
671 MODULE_ALIAS("platform:samsung-pwm");