From e4728fcf779c37d1bcbd4b6505c9b40d4bb9ff48 Mon Sep 17 00:00:00 2001 From: Heisath Date: Thu, 03 Jun 2021 10:56:53 +0200 Subject: [PATCH] Removes the hardcoded timer assignment of timers to pwm controllers This allows to use more than one pwm per gpio bank. Original patch by helios4 team, updated to work on LK5.11+ Signed-off-by: Heisath --- diff --git a/drivers/gpio/gpio-mvebu.c b/drivers/gpio/gpio-mvebu.c index bad399e3f..d3fdaf177 100644 --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -97,21 +97,42 @@ #define MVEBU_MAX_GPIO_PER_BANK 32 -struct mvebu_pwm { +enum mvebu_pwm_ctrl { + MVEBU_PWM_CTRL_SET_A = 0, + MVEBU_PWM_CTRL_SET_B, + MVEBU_PWM_CTRL_MAX +}; + +struct mvebu_pwmchip { struct regmap *regs; u32 offset; unsigned long clk_rate; - struct gpio_desc *gpiod; - struct pwm_chip chip; spinlock_t lock; - struct mvebu_gpio_chip *mvchip; + bool in_use; /* Used to preserve GPIO/PWM registers across suspend/resume */ - u32 blink_select; u32 blink_on_duration; u32 blink_off_duration; }; +struct mvebu_pwm_chip_drv { + enum mvebu_pwm_ctrl ctrl; + struct gpio_desc *gpiod; + bool master; +}; + +struct mvebu_pwm { + struct pwm_chip chip; + struct mvebu_gpio_chip *mvchip; + struct mvebu_pwmchip controller; + enum mvebu_pwm_ctrl default_counter; + + /* Used to preserve GPIO/PWM registers across suspend/resume */ + u32 blink_select; +}; + +static struct mvebu_pwmchip *mvebu_pwm_list[MVEBU_PWM_CTRL_MAX]; + struct mvebu_gpio_chip { struct gpio_chip chip; struct regmap *regs; @@ -288,12 +309,12 @@ mvebu_gpio_write_level_mask(struct mvebu_gpio_chip *mvchip, u32 val) * Functions returning offsets of individual registers for a given * PWM controller. */ -static unsigned int mvebu_pwmreg_blink_on_duration(struct mvebu_pwm *mvpwm) +static unsigned int mvebu_pwmreg_blink_on_duration(struct mvebu_pwmchip *mvpwm) { return mvpwm->offset + PWM_BLINK_ON_DURATION_OFF; } -static unsigned int mvebu_pwmreg_blink_off_duration(struct mvebu_pwm *mvpwm) +static unsigned int mvebu_pwmreg_blink_off_duration(struct mvebu_pwmchip *mvpwm) { return mvpwm->offset + PWM_BLINK_OFF_DURATION_OFF; } @@ -653,39 +674,84 @@ static int mvebu_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; struct gpio_desc *desc; + enum mvebu_pwm_ctrl id; unsigned long flags; int ret = 0; + struct mvebu_pwm_chip_drv *chip_data; - spin_lock_irqsave(&mvpwm->lock, flags); + spin_lock_irqsave(&mvpwm->controller.lock, flags); - if (mvpwm->gpiod) { + if (pwm->chip_data || (mvchip->blink_en_reg & BIT(pwm->hwpwm))) { ret = -EBUSY; - } else { - desc = gpiochip_request_own_desc(&mvchip->chip, - pwm->hwpwm, "mvebu-pwm", - GPIO_ACTIVE_HIGH, - GPIOD_OUT_LOW); - if (IS_ERR(desc)) { - ret = PTR_ERR(desc); - goto out; - } + goto out; + } + + + + desc = gpiochip_request_own_desc(&mvchip->chip, + pwm->hwpwm, "mvebu-pwm", + GPIO_ACTIVE_HIGH, + GPIOD_OUT_LOW); + + if (IS_ERR(desc)) { + ret = PTR_ERR(desc); + goto out; + } + + ret = gpiod_direction_output(desc, 0); + if (ret) { + gpiochip_free_own_desc(desc); + goto out; + } - mvpwm->gpiod = desc; + chip_data = kzalloc(sizeof(struct mvebu_pwm_chip_drv), GFP_KERNEL); + if (!chip_data) { + gpiochip_free_own_desc(desc); + ret = -ENOMEM; + goto out; + } + + for (id = MVEBU_PWM_CTRL_SET_A; id < MVEBU_PWM_CTRL_MAX; id++) { + if (!mvebu_pwm_list[id]->in_use) { + chip_data->ctrl = id; + chip_data->master = true; + mvebu_pwm_list[id]->in_use = true; + break; + } } + + if (!chip_data->master) + chip_data->ctrl = mvpwm->default_counter; + + regmap_update_bits(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, + BIT(pwm->hwpwm), chip_data->ctrl ? BIT(pwm->hwpwm) : 0); + + chip_data->gpiod = desc; + pwm->chip_data = chip_data; + + regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, + &mvpwm->blink_select); + out: - spin_unlock_irqrestore(&mvpwm->lock, flags); + spin_unlock_irqrestore(&mvpwm->controller.lock, flags); return ret; } static void mvebu_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) { struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); + struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data; unsigned long flags; - spin_lock_irqsave(&mvpwm->lock, flags); - gpiochip_free_own_desc(mvpwm->gpiod); - mvpwm->gpiod = NULL; - spin_unlock_irqrestore(&mvpwm->lock, flags); + spin_lock_irqsave(&mvpwm->controller.lock, flags); + if (chip_data->master) + mvebu_pwm_list[chip_data->ctrl]->in_use = false; + + + gpiochip_free_own_desc(chip_data->gpiod); + kfree(chip_data); + pwm->chip_data = NULL; + spin_unlock_irqrestore(&mvpwm->controller.lock, flags); } static int mvebu_pwm_get_state(struct pwm_chip *chip, @@ -693,27 +759,34 @@ static int mvebu_pwm_get_state(struct pwm_chip *chip, struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); + struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data; + struct mvebu_pwmchip *controller; struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; unsigned long long val; unsigned long flags; u32 u; - spin_lock_irqsave(&mvpwm->lock, flags); + if (chip_data) + controller = mvebu_pwm_list[chip_data->ctrl]; + else + controller = &mvpwm->controller; + + spin_lock_irqsave(&controller->lock, flags); - regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), &u); + regmap_read(controller->regs, mvebu_pwmreg_blink_on_duration(controller), &u); /* Hardware treats zero as 2^32. See mvebu_pwm_apply(). */ if (u > 0) val = u; else val = UINT_MAX + 1ULL; state->duty_cycle = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, - mvpwm->clk_rate); + controller->clk_rate); - regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), &u); + regmap_read(controller->regs, mvebu_pwmreg_blink_off_duration(controller), &u); /* period = on + off duration */ if (u > 0) val += u; else val += UINT_MAX + 1ULL; - state->period = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, mvpwm->clk_rate); + state->period = DIV_ROUND_UP_ULL(val * NSEC_PER_SEC, controller->clk_rate); regmap_read(mvchip->regs, GPIO_BLINK_EN_OFF + mvchip->offset, &u); if (u) @@ -796,15 +796,17 @@ static int mvebu_pwm_get_state(struct pwm_chip *chip, else state->enabled = false; - spin_unlock_irqrestore(&mvpwm->lock, flags); + spin_unlock_irqrestore(&controller->lock, flags); return 0; } static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, const struct pwm_state *state) { struct mvebu_pwm *mvpwm = to_mvebu_pwm(chip); + struct mvebu_pwm_chip_drv *chip_data = (struct mvebu_pwm_chip_drv*) pwm->chip_data; + struct mvebu_pwmchip *controller; struct mvebu_gpio_chip *mvchip = mvpwm->mvchip; unsigned long long val; unsigned long flags; --- a/drivers/gpio/gpio-mvebu.c +++ b/drivers/gpio/gpio-mvebu.c @@ -811,7 +813,12 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, if (state->polarity != PWM_POLARITY_NORMAL) return -EINVAL; - val = (unsigned long long) mvpwm->clk_rate * state->duty_cycle; + if (chip_data) + controller = mvebu_pwm_list[chip_data->ctrl]; + else + controller = &mvpwm->controller; + + val = (unsigned long long) controller->clk_rate * state->duty_cycle; do_div(val, NSEC_PER_SEC); if (val > UINT_MAX + 1ULL) return -EINVAL; @@ -750,7 +830,7 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, else on = 1; - val = (unsigned long long) mvpwm->clk_rate * state->period; + val = (unsigned long long) controller->clk_rate * state->period; do_div(val, NSEC_PER_SEC); val -= on; if (val > UINT_MAX + 1ULL) @@ -762,16 +842,16 @@ static int mvebu_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, else off = 1; - spin_lock_irqsave(&mvpwm->lock, flags); + spin_lock_irqsave(&controller->lock, flags); - regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), on); - regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), off); + regmap_write(controller->regs, mvebu_pwmreg_blink_on_duration(controller), on); + regmap_write(controller->regs, mvebu_pwmreg_blink_off_duration(controller), off); if (state->enabled) mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 1); else mvebu_gpio_blink(&mvchip->chip, pwm->hwpwm, 0); - spin_unlock_irqrestore(&mvpwm->lock, flags); + spin_unlock_irqrestore(&controller->lock, flags); return 0; } @@ -787,25 +867,27 @@ static const struct pwm_ops mvebu_pwm_ops = { static void __maybe_unused mvebu_pwm_suspend(struct mvebu_gpio_chip *mvchip) { struct mvebu_pwm *mvpwm = mvchip->mvpwm; + struct mvebu_pwmchip *controller = &mvpwm->controller; regmap_read(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, &mvpwm->blink_select); - regmap_read(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), - &mvpwm->blink_on_duration); - regmap_read(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), - &mvpwm->blink_off_duration); + regmap_read(controller->regs, mvebu_pwmreg_blink_on_duration(controller), + &controller->blink_on_duration); + regmap_read(controller->regs, mvebu_pwmreg_blink_off_duration(controller), + &controller->blink_off_duration); } static void __maybe_unused mvebu_pwm_resume(struct mvebu_gpio_chip *mvchip) { struct mvebu_pwm *mvpwm = mvchip->mvpwm; + struct mvebu_pwmchip *controller = &mvpwm->controller; regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, mvpwm->blink_select); - regmap_write(mvpwm->regs, mvebu_pwmreg_blink_on_duration(mvpwm), - mvpwm->blink_on_duration); - regmap_write(mvpwm->regs, mvebu_pwmreg_blink_off_duration(mvpwm), - mvpwm->blink_off_duration); + regmap_write(controller->regs, mvebu_pwmreg_blink_on_duration(controller), + controller->blink_on_duration); + regmap_write(controller->regs, mvebu_pwmreg_blink_off_duration(controller), + controller->blink_off_duration); } static int mvebu_pwm_probe(struct platform_device *pdev, @@ -902,6 +902,7 @@ static int mvebu_pwm_probe(struct platform_device *pdev, void __iomem *base; u32 offset; u32 set; + enum mvebu_pwm_ctrl ctrl_set; if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) { int ret = of_property_read_u32(dev->of_node, @@ -844,54 +920,39 @@ static int mvebu_pwm_probe(struct platform_device *pdev, mvpwm = devm_kzalloc(dev, sizeof(struct mvebu_pwm), GFP_KERNEL); if (!mvpwm) return -ENOMEM; + mvchip->mvpwm = mvpwm; mvpwm->mvchip = mvchip; - mvpwm->offset = offset; + + + base = devm_platform_ioremap_resource_byname(pdev, "pwm"); + if (IS_ERR(base)) + return PTR_ERR(base); - if (mvchip->soc_variant == MVEBU_GPIO_SOC_VARIANT_A8K) { - mvpwm->regs = mvchip->regs; + mvpwm->controller.regs = devm_regmap_init_mmio(&pdev->dev, base, + &mvebu_gpio_regmap_config); + if (IS_ERR(mvpwm->controller.regs)) + return PTR_ERR(mvpwm->controller.regs); - switch (mvchip->offset) { - case AP80X_GPIO0_OFF_A8K: - case CP11X_GPIO0_OFF_A8K: - /* Blink counter A */ - set = 0; - break; - case CP11X_GPIO1_OFF_A8K: - /* Blink counter B */ - set = U32_MAX; - mvpwm->offset += PWM_BLINK_COUNTER_B_OFF; - break; - default: - return -EINVAL; - } + /* + * Use set A for lines of GPIO chip with id 0, B for GPIO chip + * with id 1. Don't allow further GPIO chips to be used for PWM. + */ + if (id == 0) { + set = 0; + ctrl_set = MVEBU_PWM_CTRL_SET_A; + } else if (id == 1) { + set = U32_MAX; + ctrl_set = MVEBU_PWM_CTRL_SET_B; } else { - base = devm_platform_ioremap_resource_byname(pdev, "pwm"); - if (IS_ERR(base)) - return PTR_ERR(base); - - mvpwm->regs = devm_regmap_init_mmio(&pdev->dev, base, - &mvebu_gpio_regmap_config); - if (IS_ERR(mvpwm->regs)) - return PTR_ERR(mvpwm->regs); - - /* - * Use set A for lines of GPIO chip with id 0, B for GPIO chip - * with id 1. Don't allow further GPIO chips to be used for PWM. - */ - if (id == 0) - set = 0; - else if (id == 1) - set = U32_MAX; - else - return -EINVAL; + return -EINVAL; } regmap_write(mvchip->regs, GPIO_BLINK_CNT_SELECT_OFF + mvchip->offset, set); - mvpwm->clk_rate = clk_get_rate(mvchip->clk); - if (!mvpwm->clk_rate) { + mvpwm->controller.clk_rate = clk_get_rate(mvchip->clk); + if (!mvpwm->controller.clk_rate) { dev_err(dev, "failed to get clock rate\n"); return -EINVAL; } @@ -907,7 +968,10 @@ static int mvebu_pwm_probe(struct platform_device *pdev, mvpwm->chip.ops = &mvebu_pwm_ops; mvpwm->chip.npwm = mvchip->chip.ngpio; - spin_lock_init(&mvpwm->lock); + spin_lock_init(&mvpwm->controller.lock); + + mvpwm->default_counter = ctrl_set; + mvebu_pwm_list[ctrl_set] = &mvpwm->controller; return pwmchip_add(&mvpwm->chip); }