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[86.162.200.138]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-47906cb1f60sm88426585e9.1.2025.11.28.02.34.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Nov 2025 02:34:34 -0800 (PST) From: Biju X-Google-Original-From: Biju To: =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= Cc: Biju Das , linux-pwm@vger.kernel.org, linux-kernel@vger.kernel.org, Geert Uytterhoeven , Prabhakar Mahadev Lad , Biju Das , linux-renesas-soc@vger.kernel.org Subject: [PATCH v4] pwm: rzg2l-gpt: Implementation of the waveform callbacks Date: Fri, 28 Nov 2025 10:34:29 +0000 Message-ID: <20251128103431.161591-1-biju.das.jz@bp.renesas.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-pwm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Biju Das Convert the rzg2l-gpt driver to use the new callbacks for hardware programming. Signed-off-by: Biju Das --- v3->v4: * Rebased the patch. * rzg2l_gpt_is_ch_enabled() fit into 80-character limit for consistency with other functions. v2->v3: * Prepared as a series. * Created separate patch for fix for reinitialization of the cache variable in disable(). * .round_waveform_tohw() do not fail if the requested period is too small but use the smallest possible value. * Added lock in rzg2l_gpt_read_waveform(). * wfhw is reinitialized in rzg2l_gpt_read_waveform if channel is disabled * Optimizated rzg2l_gpt_is_ch_enabled() to avoid redundant reads to RZG2L_GTCR(ch). * .write_waveform() returns error incase of invalid period for second channel. v1->v2: * Dropped modifing hardware from .round_waveform_tohw() callback. v1: * https://lore.kernel.org/all/20250805065032.193766-1-biju.das.jz@bp.renesas.com/ --- drivers/pwm/pwm-rzg2l-gpt.c | 192 ++++++++++++++++++++++-------------- 1 file changed, 118 insertions(+), 74 deletions(-) base-commit: 7d31f578f3230f3b7b33b0930b08f9afd8429817 diff --git a/drivers/pwm/pwm-rzg2l-gpt.c b/drivers/pwm/pwm-rzg2l-gpt.c index 4856af080e8e..2f424a7b05cc 100644 --- a/drivers/pwm/pwm-rzg2l-gpt.c +++ b/drivers/pwm/pwm-rzg2l-gpt.c @@ -86,6 +86,13 @@ struct rzg2l_gpt_chip { u32 channel_enable_count[RZG2L_MAX_HW_CHANNELS]; }; +/* This represents a hardware configuration for one channel */ +struct rzg2l_gpt_waveform { + u32 gtpr; + u32 gtccr; + u8 prescale; +}; + static inline struct rzg2l_gpt_chip *to_rzg2l_gpt_chip(struct pwm_chip *chip) { return pwmchip_get_drvdata(chip); @@ -153,7 +160,8 @@ static void rzg2l_gpt_free(struct pwm_chip *chip, struct pwm_device *pwm) rzg2l_gpt->channel_request_count[ch]--; } -static bool rzg2l_gpt_is_ch_enabled(struct rzg2l_gpt_chip *rzg2l_gpt, u8 hwpwm) +static bool rzg2l_gpt_is_ch_enabled(struct rzg2l_gpt_chip *rzg2l_gpt, u8 hwpwm, + u32 *gtcr) { u8 ch = RZG2L_GET_CH(hwpwm); u32 val; @@ -162,6 +170,9 @@ static bool rzg2l_gpt_is_ch_enabled(struct rzg2l_gpt_chip *rzg2l_gpt, u8 hwpwm) if (!(val & RZG2L_GTCR_CST)) return false; + if (gtcr) + *gtcr = val; + val = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTIOR(ch)); return val & RZG2L_GTIOR_OxE(rzg2l_gpt_subchannel(hwpwm)); @@ -220,54 +231,38 @@ static u64 rzg2l_gpt_calculate_period_or_duty(struct rzg2l_gpt_chip *rzg2l_gpt, return DIV64_U64_ROUND_UP(tmp, rzg2l_gpt->rate_khz); } -static int rzg2l_gpt_get_state(struct pwm_chip *chip, struct pwm_device *pwm, - struct pwm_state *state) -{ - struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); - - state->enabled = rzg2l_gpt_is_ch_enabled(rzg2l_gpt, pwm->hwpwm); - if (state->enabled) { - u32 sub_ch = rzg2l_gpt_subchannel(pwm->hwpwm); - u32 ch = RZG2L_GET_CH(pwm->hwpwm); - u8 prescale; - u32 val; - - val = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTCR(ch)); - prescale = FIELD_GET(RZG2L_GTCR_TPCS, val); - - val = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTPR(ch)); - state->period = rzg2l_gpt_calculate_period_or_duty(rzg2l_gpt, val, prescale); - - val = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTCCR(ch, sub_ch)); - state->duty_cycle = rzg2l_gpt_calculate_period_or_duty(rzg2l_gpt, val, prescale); - if (state->duty_cycle > state->period) - state->duty_cycle = state->period; - } - - state->polarity = PWM_POLARITY_NORMAL; - - return 0; -} - static u32 rzg2l_gpt_calculate_pv_or_dc(u64 period_or_duty_cycle, u8 prescale) { return min_t(u64, DIV_ROUND_DOWN_ULL(period_or_duty_cycle, 1 << (2 * prescale)), U32_MAX); } -/* Caller holds the lock while calling rzg2l_gpt_config() */ -static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm, - const struct pwm_state *state) +static int rzg2l_gpt_round_waveform_tohw(struct pwm_chip *chip, + struct pwm_device *pwm, + const struct pwm_waveform *wf, + void *_wfhw) + { struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); - u8 sub_ch = rzg2l_gpt_subchannel(pwm->hwpwm); + struct rzg2l_gpt_waveform *wfhw = _wfhw; + bool is_small_second_period = false; u8 ch = RZG2L_GET_CH(pwm->hwpwm); u64 period_ticks, duty_ticks; unsigned long pv, dc; - u8 prescale; + + guard(mutex)(&rzg2l_gpt->lock); + if (wf->period_length_ns == 0) { + *wfhw = (struct rzg2l_gpt_waveform){ + .gtpr = 0, + .gtccr = 0, + .prescale = 0, + }; + + return 0; + } /* Limit period/duty cycle to max value supported by the HW */ - period_ticks = mul_u64_u64_div_u64(state->period, rzg2l_gpt->rate_khz, USEC_PER_SEC); + period_ticks = mul_u64_u64_div_u64(wf->period_length_ns, rzg2l_gpt->rate_khz, USEC_PER_SEC); if (period_ticks > RZG2L_MAX_TICKS) period_ticks = RZG2L_MAX_TICKS; /* @@ -278,21 +273,25 @@ static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm, if (rzg2l_gpt->channel_request_count[ch] > 1) { u8 sibling_ch = rzg2l_gpt_sibling(pwm->hwpwm); - if (rzg2l_gpt_is_ch_enabled(rzg2l_gpt, sibling_ch)) { + if (rzg2l_gpt_is_ch_enabled(rzg2l_gpt, sibling_ch, NULL)) { if (period_ticks < rzg2l_gpt->period_ticks[ch]) - return -EBUSY; + is_small_second_period = true; period_ticks = rzg2l_gpt->period_ticks[ch]; } } - prescale = rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks); - pv = rzg2l_gpt_calculate_pv_or_dc(period_ticks, prescale); + wfhw->prescale = rzg2l_gpt_calculate_prescale(rzg2l_gpt, period_ticks); + pv = rzg2l_gpt_calculate_pv_or_dc(period_ticks, wfhw->prescale); + wfhw->gtpr = pv; + if (is_small_second_period) + return 1; - duty_ticks = mul_u64_u64_div_u64(state->duty_cycle, rzg2l_gpt->rate_khz, USEC_PER_SEC); + duty_ticks = mul_u64_u64_div_u64(wf->duty_length_ns, rzg2l_gpt->rate_khz, USEC_PER_SEC); if (duty_ticks > period_ticks) duty_ticks = period_ticks; - dc = rzg2l_gpt_calculate_pv_or_dc(duty_ticks, prescale); + dc = rzg2l_gpt_calculate_pv_or_dc(duty_ticks, wfhw->prescale); + wfhw->gtccr = dc; /* * GPT counter is shared by multiple channels, we cache the period ticks @@ -301,6 +300,61 @@ static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm, */ rzg2l_gpt->period_ticks[ch] = period_ticks; + return 0; +} + +static int rzg2l_gpt_round_waveform_fromhw(struct pwm_chip *chip, + struct pwm_device *pwm, + const void *_wfhw, + struct pwm_waveform *wf) +{ + struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); + const struct rzg2l_gpt_waveform *wfhw = _wfhw; + + wf->period_length_ns = rzg2l_gpt_calculate_period_or_duty(rzg2l_gpt, wfhw->gtpr, + wfhw->prescale); + wf->duty_length_ns = rzg2l_gpt_calculate_period_or_duty(rzg2l_gpt, wfhw->gtccr, + wfhw->prescale); + wf->duty_offset_ns = 0; + + return 0; +} + +static int rzg2l_gpt_read_waveform(struct pwm_chip *chip, + struct pwm_device *pwm, + void *_wfhw) +{ + struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); + struct rzg2l_gpt_waveform *wfhw = _wfhw; + u32 sub_ch = rzg2l_gpt_subchannel(pwm->hwpwm); + u32 ch = RZG2L_GET_CH(pwm->hwpwm); + u32 gtcr; + + guard(mutex)(&rzg2l_gpt->lock); + if (rzg2l_gpt_is_ch_enabled(rzg2l_gpt, pwm->hwpwm, >cr)) { + wfhw->prescale = FIELD_GET(RZG2L_GTCR_TPCS, gtcr); + wfhw->gtpr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTPR(ch)); + wfhw->gtccr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTCCR(ch, sub_ch)); + if (wfhw->gtccr > wfhw->gtpr) + wfhw->gtccr = wfhw->gtpr; + } else { + *wfhw = (struct rzg2l_gpt_waveform) { }; + } + + return 0; +} + +static int rzg2l_gpt_write_waveform(struct pwm_chip *chip, + struct pwm_device *pwm, + const void *_wfhw) +{ + struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); + const struct rzg2l_gpt_waveform *wfhw = _wfhw; + u8 sub_ch = rzg2l_gpt_subchannel(pwm->hwpwm); + u8 ch = RZG2L_GET_CH(pwm->hwpwm); + u32 gptr; + + guard(mutex)(&rzg2l_gpt->lock); /* * Counter must be stopped before modifying mode, prescaler, timer * counter and buffer enable registers. These registers are shared @@ -319,14 +373,20 @@ static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm, /* Select count clock */ rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), RZG2L_GTCR_TPCS, - FIELD_PREP(RZG2L_GTCR_TPCS, prescale)); + FIELD_PREP(RZG2L_GTCR_TPCS, wfhw->prescale)); /* Set period */ - rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTPR(ch), pv); + rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTPR(ch), wfhw->gtpr); + } else { + if (wfhw->gtpr) { + gptr = rzg2l_gpt_read(rzg2l_gpt, RZG2L_GTPR(ch)); + if (wfhw->gtpr < gptr) + return -EBUSY; + } } /* Set duty cycle */ - rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTCCR(ch, sub_ch), dc); + rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTCCR(ch, sub_ch), wfhw->gtccr); if (rzg2l_gpt->channel_enable_count[ch] <= 1) { /* Set initial value for counter */ @@ -335,44 +395,28 @@ static int rzg2l_gpt_config(struct pwm_chip *chip, struct pwm_device *pwm, /* Set no buffer operation */ rzg2l_gpt_write(rzg2l_gpt, RZG2L_GTBER(ch), 0); - /* Restart the counter after updating the registers */ - rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), - RZG2L_GTCR_CST, RZG2L_GTCR_CST); - } - - return 0; -} - -static int rzg2l_gpt_apply(struct pwm_chip *chip, struct pwm_device *pwm, - const struct pwm_state *state) -{ - struct rzg2l_gpt_chip *rzg2l_gpt = to_rzg2l_gpt_chip(chip); - bool enabled = pwm->state.enabled; - int ret; - - if (state->polarity != PWM_POLARITY_NORMAL) - return -EINVAL; - - guard(mutex)(&rzg2l_gpt->lock); - if (!state->enabled) { - if (enabled) - rzg2l_gpt_disable(rzg2l_gpt, pwm); - - return 0; + if (wfhw->gtpr) + /* Restart the counter after updating the registers */ + rzg2l_gpt_modify(rzg2l_gpt, RZG2L_GTCR(ch), + RZG2L_GTCR_CST, RZG2L_GTCR_CST); } - ret = rzg2l_gpt_config(chip, pwm, state); - if (!ret && !enabled) + if (wfhw->gtpr && !rzg2l_gpt_is_ch_enabled(rzg2l_gpt, pwm->hwpwm, NULL)) rzg2l_gpt_enable(rzg2l_gpt, pwm); + else if (!wfhw->gtpr && rzg2l_gpt_is_ch_enabled(rzg2l_gpt, pwm->hwpwm, NULL)) + rzg2l_gpt_disable(rzg2l_gpt, pwm); - return ret; + return 0; } static const struct pwm_ops rzg2l_gpt_ops = { .request = rzg2l_gpt_request, .free = rzg2l_gpt_free, - .get_state = rzg2l_gpt_get_state, - .apply = rzg2l_gpt_apply, + .sizeof_wfhw = sizeof(struct rzg2l_gpt_waveform), + .round_waveform_tohw = rzg2l_gpt_round_waveform_tohw, + .round_waveform_fromhw = rzg2l_gpt_round_waveform_fromhw, + .read_waveform = rzg2l_gpt_read_waveform, + .write_waveform = rzg2l_gpt_write_waveform, }; static int rzg2l_gpt_probe(struct platform_device *pdev)