add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/pwm/pwm-rcar.c
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@@ -1,16 +1,18 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * R-Car PWM Timer driver
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  *
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  * Copyright (C) 2015 Renesas Electronics Corporation
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  *
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- * This is free software; you can redistribute it and/or modify
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- * it under the terms of version 2 of the GNU General Public License as
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- * published by the Free Software Foundation.
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+ * Limitations:
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+ * - The hardware cannot generate a 0% duty cycle.
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  */
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 #include <linux/clk.h>
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 #include <linux/err.h>
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 #include <linux/io.h>
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+#include <linux/log2.h>
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+#include <linux/math64.h>
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 #include <linux/module.h>
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 #include <linux/of.h>
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 #include <linux/platform_device.h>
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@@ -71,19 +73,15 @@
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 static int rcar_pwm_get_clock_division(struct rcar_pwm_chip *rp, int period_ns)
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 {
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 	unsigned long clk_rate = clk_get_rate(rp->clk);
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-	unsigned long long max; /* max cycle / nanoseconds */
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-	unsigned int div;
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+	u64 div, tmp;
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 	if (clk_rate == 0)
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 		return -EINVAL;
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-	for (div = 0; div <= RCAR_PWM_MAX_DIVISION; div++) {
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-		max = (unsigned long long)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE *
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-			(1 << div);
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-		do_div(max, clk_rate);
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-		if (period_ns <= max)
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-			break;
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-	}
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+	div = (u64)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE;
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+	tmp = (u64)period_ns * clk_rate + div - 1;
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+	tmp = div64_u64(tmp, div);
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+	div = ilog2(tmp - 1) + 1;
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 	return (div <= RCAR_PWM_MAX_DIVISION) ? div : -ERANGE;
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 }
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@@ -142,39 +140,8 @@
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 	pm_runtime_put(chip->dev);
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 }
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142
 
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-static int rcar_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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-			   int duty_ns, int period_ns)
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+static int rcar_pwm_enable(struct rcar_pwm_chip *rp)
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 {
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-	struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
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-	int div, ret;
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-
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-	div = rcar_pwm_get_clock_division(rp, period_ns);
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-	if (div < 0)
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-		return div;
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-
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-	/*
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-	 * Let the core driver set pwm->period if disabled and duty_ns == 0.
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-	 * But, this driver should prevent to set the new duty_ns if current
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-	 * duty_cycle is not set
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-	 */
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-	if (!pwm_is_enabled(pwm) && !duty_ns && !pwm->state.duty_cycle)
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-		return 0;
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-
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-	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, RCAR_PWMCR_SYNC, RCAR_PWMCR);
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-
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-	ret = rcar_pwm_set_counter(rp, div, duty_ns, period_ns);
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-	if (!ret)
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-		rcar_pwm_set_clock_control(rp, div);
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-
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-	/* The SYNC should be set to 0 even if rcar_pwm_set_counter failed */
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-	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, 0, RCAR_PWMCR);
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-
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-	return ret;
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-}
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-
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-static int rcar_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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-{
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-	struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
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 	u32 value;
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 	/* Don't enable the PWM device if CYC0 or PH0 is 0 */
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@@ -188,19 +155,49 @@
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 	return 0;
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 }
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157
 
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-static void rcar_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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+static void rcar_pwm_disable(struct rcar_pwm_chip *rp)
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+{
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+	rcar_pwm_update(rp, RCAR_PWMCR_EN0, 0, RCAR_PWMCR);
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+}
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+
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+static int rcar_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
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+			  const struct pwm_state *state)
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 {
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 	struct rcar_pwm_chip *rp = to_rcar_pwm_chip(chip);
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+	int div, ret;
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-	rcar_pwm_update(rp, RCAR_PWMCR_EN0, 0, RCAR_PWMCR);
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+	/* This HW/driver only supports normal polarity */
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+	if (state->polarity != PWM_POLARITY_NORMAL)
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+		return -ENOTSUPP;
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+
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+	if (!state->enabled) {
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+		rcar_pwm_disable(rp);
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+		return 0;
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+	}
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+
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+	div = rcar_pwm_get_clock_division(rp, state->period);
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+	if (div < 0)
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+		return div;
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+
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+	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, RCAR_PWMCR_SYNC, RCAR_PWMCR);
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+
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+	ret = rcar_pwm_set_counter(rp, div, state->duty_cycle, state->period);
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+	if (!ret)
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+		rcar_pwm_set_clock_control(rp, div);
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+
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+	/* The SYNC should be set to 0 even if rcar_pwm_set_counter failed */
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+	rcar_pwm_update(rp, RCAR_PWMCR_SYNC, 0, RCAR_PWMCR);
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+
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+	if (!ret)
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+		ret = rcar_pwm_enable(rp);
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+
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+	return ret;
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 }
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 static const struct pwm_ops rcar_pwm_ops = {
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 	.request = rcar_pwm_request,
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 	.free = rcar_pwm_free,
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-	.config = rcar_pwm_config,
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-	.enable = rcar_pwm_enable,
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-	.disable = rcar_pwm_disable,
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+	.apply = rcar_pwm_apply,
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 	.owner = THIS_MODULE,
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 };
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@@ -262,52 +259,11 @@
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 };
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 MODULE_DEVICE_TABLE(of, rcar_pwm_of_table);
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-#ifdef CONFIG_PM_SLEEP
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-static struct pwm_device *rcar_pwm_dev_to_pwm_dev(struct device *dev)
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-{
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-	struct rcar_pwm_chip *rcar_pwm = dev_get_drvdata(dev);
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-	struct pwm_chip *chip = &rcar_pwm->chip;
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-
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-	return &chip->pwms[0];
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-}
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-
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-static int rcar_pwm_suspend(struct device *dev)
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-{
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-	struct pwm_device *pwm = rcar_pwm_dev_to_pwm_dev(dev);
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-
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-	if (!test_bit(PWMF_REQUESTED, &pwm->flags))
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-		return 0;
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-
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-	pm_runtime_put(dev);
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-
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-	return 0;
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-}
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-
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-static int rcar_pwm_resume(struct device *dev)
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-{
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-	struct pwm_device *pwm = rcar_pwm_dev_to_pwm_dev(dev);
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-
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-	if (!test_bit(PWMF_REQUESTED, &pwm->flags))
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-		return 0;
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-
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-	pm_runtime_get_sync(dev);
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-
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-	rcar_pwm_config(pwm->chip, pwm, pwm->state.duty_cycle,
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-			pwm->state.period);
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-	if (pwm_is_enabled(pwm))
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-		rcar_pwm_enable(pwm->chip, pwm);
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-
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-	return 0;
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-}
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-#endif /* CONFIG_PM_SLEEP */
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-static SIMPLE_DEV_PM_OPS(rcar_pwm_pm_ops, rcar_pwm_suspend, rcar_pwm_resume);
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-
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 static struct platform_driver rcar_pwm_driver = {
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 	.probe = rcar_pwm_probe,
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 	.remove = rcar_pwm_remove,
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 	.driver = {
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 		.name = "pwm-rcar",
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-		.pm	= &rcar_pwm_pm_ops,
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 		.of_match_table = of_match_ptr(rcar_pwm_of_table),
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 	}
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 };