Lines Matching +full:pwm +full:- +full:period
1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Freescale FlexTimer Module (FTM) PWM Driver
5 * Copyright 2012-2013 Freescale Semiconductor, Inc.
17 #include <linux/pwm.h>
47 /* This value is valid iff a pwm is running */
48 struct fsl_pwm_periodcfg period; member
65 regmap_read(fpc->regmap, FTM_FMS, &val); in ftm_clear_write_protection()
67 regmap_set_bits(fpc->regmap, FTM_MODE, FTM_MODE_WPDIS); in ftm_clear_write_protection()
72 regmap_set_bits(fpc->regmap, FTM_FMS, FTM_FMS_WPEN); in ftm_set_write_protection()
78 if (a->clk_select != b->clk_select) in fsl_pwm_periodcfg_are_equal()
80 if (a->clk_ps != b->clk_ps) in fsl_pwm_periodcfg_are_equal()
82 if (a->mod_period != b->mod_period) in fsl_pwm_periodcfg_are_equal()
87 static int fsl_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) in fsl_pwm_request() argument
92 ret = clk_prepare_enable(fpc->ipg_clk); in fsl_pwm_request()
93 if (!ret && fpc->soc->has_enable_bits) { in fsl_pwm_request()
94 mutex_lock(&fpc->lock); in fsl_pwm_request()
95 regmap_set_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16)); in fsl_pwm_request()
96 mutex_unlock(&fpc->lock); in fsl_pwm_request()
102 static void fsl_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) in fsl_pwm_free() argument
106 if (fpc->soc->has_enable_bits) { in fsl_pwm_free()
107 mutex_lock(&fpc->lock); in fsl_pwm_free()
108 regmap_clear_bits(fpc->regmap, FTM_SC, BIT(pwm->hwpwm + 16)); in fsl_pwm_free()
109 mutex_unlock(&fpc->lock); in fsl_pwm_free()
112 clk_disable_unprepare(fpc->ipg_clk); in fsl_pwm_free()
121 rate = clk_get_rate(fpc->clk[fpc->period.clk_select]); in fsl_pwm_ticks_to_ns()
124 do_div(exval, rate >> fpc->period.clk_ps); in fsl_pwm_ticks_to_ns()
137 c = clk_get_rate(fpc->clk[index]); in fsl_pwm_calculate_period_clk()
146 periodcfg->clk_select = index; in fsl_pwm_calculate_period_clk()
147 periodcfg->clk_ps = ps; in fsl_pwm_calculate_period_clk()
148 periodcfg->mod_period = c - 1; in fsl_pwm_calculate_period_clk()
168 fix_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_FIX]); in fsl_pwm_calculate_period()
169 ext_rate = clk_get_rate(fpc->clk[FSL_PWM_CLK_EXT]); in fsl_pwm_calculate_period()
191 unsigned int period = fpc->period.mod_period + 1; in fsl_pwm_calculate_duty() local
192 unsigned int period_ns = fsl_pwm_ticks_to_ns(fpc, period); in fsl_pwm_calculate_duty()
194 duty = (unsigned long long)duty_ns * period; in fsl_pwm_calculate_duty()
201 struct pwm_device *pwm) in fsl_pwm_is_any_pwm_enabled() argument
205 regmap_read(fpc->regmap, FTM_OUTMASK, &val); in fsl_pwm_is_any_pwm_enabled()
213 struct pwm_device *pwm) in fsl_pwm_is_other_pwm_enabled() argument
217 regmap_read(fpc->regmap, FTM_OUTMASK, &val); in fsl_pwm_is_other_pwm_enabled()
218 if (~(val | BIT(pwm->hwpwm)) & 0xFF) in fsl_pwm_is_other_pwm_enabled()
225 struct pwm_device *pwm, in fsl_pwm_apply_config() argument
234 if (!fsl_pwm_calculate_period(fpc, newstate->period, &periodcfg)) { in fsl_pwm_apply_config()
235 dev_err(fpc->chip.dev, "failed to calculate new period\n"); in fsl_pwm_apply_config()
236 return -EINVAL; in fsl_pwm_apply_config()
239 if (!fsl_pwm_is_any_pwm_enabled(fpc, pwm)) in fsl_pwm_apply_config()
242 * The Freescale FTM controller supports only a single period for in fsl_pwm_apply_config()
243 * all PWM channels, therefore verify if the newly computed period in fsl_pwm_apply_config()
244 * is different than the current period being used. In such case in fsl_pwm_apply_config()
245 * we allow to change the period only if no other pwm is running. in fsl_pwm_apply_config()
247 else if (!fsl_pwm_periodcfg_are_equal(&fpc->period, &periodcfg)) { in fsl_pwm_apply_config()
248 if (fsl_pwm_is_other_pwm_enabled(fpc, pwm)) { in fsl_pwm_apply_config()
249 dev_err(fpc->chip.dev, in fsl_pwm_apply_config()
250 "Cannot change period for PWM %u, disable other PWMs first\n", in fsl_pwm_apply_config()
251 pwm->hwpwm); in fsl_pwm_apply_config()
252 return -EBUSY; in fsl_pwm_apply_config()
254 if (fpc->period.clk_select != periodcfg.clk_select) { in fsl_pwm_apply_config()
256 enum fsl_pwm_clk oldclk = fpc->period.clk_select; in fsl_pwm_apply_config()
259 ret = clk_prepare_enable(fpc->clk[newclk]); in fsl_pwm_apply_config()
262 clk_disable_unprepare(fpc->clk[oldclk]); in fsl_pwm_apply_config()
270 regmap_update_bits(fpc->regmap, FTM_SC, FTM_SC_CLK_MASK, in fsl_pwm_apply_config()
272 regmap_update_bits(fpc->regmap, FTM_SC, FTM_SC_PS_MASK, in fsl_pwm_apply_config()
274 regmap_write(fpc->regmap, FTM_MOD, periodcfg.mod_period); in fsl_pwm_apply_config()
276 fpc->period = periodcfg; in fsl_pwm_apply_config()
279 duty = fsl_pwm_calculate_duty(fpc, newstate->duty_cycle); in fsl_pwm_apply_config()
281 regmap_write(fpc->regmap, FTM_CSC(pwm->hwpwm), in fsl_pwm_apply_config()
283 regmap_write(fpc->regmap, FTM_CV(pwm->hwpwm), duty); in fsl_pwm_apply_config()
286 if (newstate->polarity == PWM_POLARITY_INVERSED) in fsl_pwm_apply_config()
287 reg_polarity = BIT(pwm->hwpwm); in fsl_pwm_apply_config()
289 regmap_update_bits(fpc->regmap, FTM_POL, BIT(pwm->hwpwm), reg_polarity); in fsl_pwm_apply_config()
296 static int fsl_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, in fsl_pwm_apply() argument
300 struct pwm_state *oldstate = &pwm->state; in fsl_pwm_apply()
312 mutex_lock(&fpc->lock); in fsl_pwm_apply()
314 if (!newstate->enabled) { in fsl_pwm_apply()
315 if (oldstate->enabled) { in fsl_pwm_apply()
316 regmap_set_bits(fpc->regmap, FTM_OUTMASK, in fsl_pwm_apply()
317 BIT(pwm->hwpwm)); in fsl_pwm_apply()
318 clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]); in fsl_pwm_apply()
319 clk_disable_unprepare(fpc->clk[fpc->period.clk_select]); in fsl_pwm_apply()
325 ret = fsl_pwm_apply_config(fpc, pwm, newstate); in fsl_pwm_apply()
330 if (!oldstate->enabled) { in fsl_pwm_apply()
331 ret = clk_prepare_enable(fpc->clk[fpc->period.clk_select]); in fsl_pwm_apply()
335 ret = clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]); in fsl_pwm_apply()
337 clk_disable_unprepare(fpc->clk[fpc->period.clk_select]); in fsl_pwm_apply()
341 regmap_clear_bits(fpc->regmap, FTM_OUTMASK, BIT(pwm->hwpwm)); in fsl_pwm_apply()
345 mutex_unlock(&fpc->lock); in fsl_pwm_apply()
359 ret = clk_prepare_enable(fpc->ipg_clk); in fsl_pwm_init()
363 regmap_write(fpc->regmap, FTM_CNTIN, 0x00); in fsl_pwm_init()
364 regmap_write(fpc->regmap, FTM_OUTINIT, 0x00); in fsl_pwm_init()
365 regmap_write(fpc->regmap, FTM_OUTMASK, 0xFF); in fsl_pwm_init()
367 clk_disable_unprepare(fpc->ipg_clk); in fsl_pwm_init()
399 fpc = devm_kzalloc(&pdev->dev, sizeof(*fpc), GFP_KERNEL); in fsl_pwm_probe()
401 return -ENOMEM; in fsl_pwm_probe()
403 mutex_init(&fpc->lock); in fsl_pwm_probe()
405 fpc->soc = of_device_get_match_data(&pdev->dev); in fsl_pwm_probe()
406 fpc->chip.dev = &pdev->dev; in fsl_pwm_probe()
412 fpc->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "ftm_sys", base, in fsl_pwm_probe()
414 if (IS_ERR(fpc->regmap)) { in fsl_pwm_probe()
415 dev_err(&pdev->dev, "regmap init failed\n"); in fsl_pwm_probe()
416 return PTR_ERR(fpc->regmap); in fsl_pwm_probe()
419 fpc->clk[FSL_PWM_CLK_SYS] = devm_clk_get(&pdev->dev, "ftm_sys"); in fsl_pwm_probe()
420 if (IS_ERR(fpc->clk[FSL_PWM_CLK_SYS])) { in fsl_pwm_probe()
421 dev_err(&pdev->dev, "failed to get \"ftm_sys\" clock\n"); in fsl_pwm_probe()
422 return PTR_ERR(fpc->clk[FSL_PWM_CLK_SYS]); in fsl_pwm_probe()
425 fpc->clk[FSL_PWM_CLK_FIX] = devm_clk_get(fpc->chip.dev, "ftm_fix"); in fsl_pwm_probe()
426 if (IS_ERR(fpc->clk[FSL_PWM_CLK_FIX])) in fsl_pwm_probe()
427 return PTR_ERR(fpc->clk[FSL_PWM_CLK_FIX]); in fsl_pwm_probe()
429 fpc->clk[FSL_PWM_CLK_EXT] = devm_clk_get(fpc->chip.dev, "ftm_ext"); in fsl_pwm_probe()
430 if (IS_ERR(fpc->clk[FSL_PWM_CLK_EXT])) in fsl_pwm_probe()
431 return PTR_ERR(fpc->clk[FSL_PWM_CLK_EXT]); in fsl_pwm_probe()
433 fpc->clk[FSL_PWM_CLK_CNTEN] = in fsl_pwm_probe()
434 devm_clk_get(fpc->chip.dev, "ftm_cnt_clk_en"); in fsl_pwm_probe()
435 if (IS_ERR(fpc->clk[FSL_PWM_CLK_CNTEN])) in fsl_pwm_probe()
436 return PTR_ERR(fpc->clk[FSL_PWM_CLK_CNTEN]); in fsl_pwm_probe()
442 fpc->ipg_clk = devm_clk_get(&pdev->dev, "ipg"); in fsl_pwm_probe()
443 if (IS_ERR(fpc->ipg_clk)) in fsl_pwm_probe()
444 fpc->ipg_clk = fpc->clk[FSL_PWM_CLK_SYS]; in fsl_pwm_probe()
447 fpc->chip.ops = &fsl_pwm_ops; in fsl_pwm_probe()
448 fpc->chip.npwm = 8; in fsl_pwm_probe()
450 ret = devm_pwmchip_add(&pdev->dev, &fpc->chip); in fsl_pwm_probe()
452 dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret); in fsl_pwm_probe()
467 regcache_cache_only(fpc->regmap, true); in fsl_pwm_suspend()
468 regcache_mark_dirty(fpc->regmap); in fsl_pwm_suspend()
470 for (i = 0; i < fpc->chip.npwm; i++) { in fsl_pwm_suspend()
471 struct pwm_device *pwm = &fpc->chip.pwms[i]; in fsl_pwm_suspend() local
473 if (!test_bit(PWMF_REQUESTED, &pwm->flags)) in fsl_pwm_suspend()
476 clk_disable_unprepare(fpc->ipg_clk); in fsl_pwm_suspend()
478 if (!pwm_is_enabled(pwm)) in fsl_pwm_suspend()
481 clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]); in fsl_pwm_suspend()
482 clk_disable_unprepare(fpc->clk[fpc->period.clk_select]); in fsl_pwm_suspend()
493 for (i = 0; i < fpc->chip.npwm; i++) { in fsl_pwm_resume()
494 struct pwm_device *pwm = &fpc->chip.pwms[i]; in fsl_pwm_resume() local
496 if (!test_bit(PWMF_REQUESTED, &pwm->flags)) in fsl_pwm_resume()
499 clk_prepare_enable(fpc->ipg_clk); in fsl_pwm_resume()
501 if (!pwm_is_enabled(pwm)) in fsl_pwm_resume()
504 clk_prepare_enable(fpc->clk[fpc->period.clk_select]); in fsl_pwm_resume()
505 clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]); in fsl_pwm_resume()
509 regcache_cache_only(fpc->regmap, false); in fsl_pwm_resume()
510 regcache_sync(fpc->regmap); in fsl_pwm_resume()
529 { .compatible = "fsl,vf610-ftm-pwm", .data = &vf610_ftm_pwm },
530 { .compatible = "fsl,imx8qm-ftm-pwm", .data = &imx8qm_ftm_pwm },
537 .name = "fsl-ftm-pwm",
545 MODULE_DESCRIPTION("Freescale FlexTimer Module PWM Driver");
547 MODULE_ALIAS("platform:fsl-ftm-pwm");