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-rw-r--r--drivers/pwm/pwm-tegra.c442
1 files changed, 442 insertions, 0 deletions
diff --git a/drivers/pwm/pwm-tegra.c b/drivers/pwm/pwm-tegra.c
new file mode 100644
index 0000000000..a169a34e07
--- /dev/null
+++ b/drivers/pwm/pwm-tegra.c
@@ -0,0 +1,442 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * drivers/pwm/pwm-tegra.c
+ *
+ * Tegra pulse-width-modulation controller driver
+ *
+ * Copyright (c) 2010-2020, NVIDIA Corporation.
+ * Based on arch/arm/plat-mxc/pwm.c by Sascha Hauer <s.hauer@pengutronix.de>
+ *
+ * Overview of Tegra Pulse Width Modulator Register:
+ * 1. 13-bit: Frequency division (SCALE)
+ * 2. 8-bit : Pulse division (DUTY)
+ * 3. 1-bit : Enable bit
+ *
+ * The PWM clock frequency is divided by 256 before subdividing it based
+ * on the programmable frequency division value to generate the required
+ * frequency for PWM output. The maximum output frequency that can be
+ * achieved is (max rate of source clock) / 256.
+ * e.g. if source clock rate is 408 MHz, maximum output frequency can be:
+ * 408 MHz/256 = 1.6 MHz.
+ * This 1.6 MHz frequency can further be divided using SCALE value in PWM.
+ *
+ * PWM pulse width: 8 bits are usable [23:16] for varying pulse width.
+ * To achieve 100% duty cycle, program Bit [24] of this register to
+ * 1’b1. In which case the other bits [23:16] are set to don't care.
+ *
+ * Limitations:
+ * - When PWM is disabled, the output is driven to inactive.
+ * - It does not allow the current PWM period to complete and
+ * stops abruptly.
+ *
+ * - If the register is reconfigured while PWM is running,
+ * it does not complete the currently running period.
+ *
+ * - If the user input duty is beyond acceptible limits,
+ * -EINVAL is returned.
+ */
+
+#include <linux/clk.h>
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/pm_opp.h>
+#include <linux/pwm.h>
+#include <linux/platform_device.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/pm_runtime.h>
+#include <linux/slab.h>
+#include <linux/reset.h>
+
+#include <soc/tegra/common.h>
+
+#define PWM_ENABLE (1 << 31)
+#define PWM_DUTY_WIDTH 8
+#define PWM_DUTY_SHIFT 16
+#define PWM_SCALE_WIDTH 13
+#define PWM_SCALE_SHIFT 0
+
+struct tegra_pwm_soc {
+ unsigned int num_channels;
+
+ /* Maximum IP frequency for given SoCs */
+ unsigned long max_frequency;
+};
+
+struct tegra_pwm_chip {
+ struct pwm_chip chip;
+ struct device *dev;
+
+ struct clk *clk;
+ struct reset_control*rst;
+
+ unsigned long clk_rate;
+ unsigned long min_period_ns;
+
+ void __iomem *regs;
+
+ const struct tegra_pwm_soc *soc;
+};
+
+static inline struct tegra_pwm_chip *to_tegra_pwm_chip(struct pwm_chip *chip)
+{
+ return container_of(chip, struct tegra_pwm_chip, chip);
+}
+
+static inline u32 pwm_readl(struct tegra_pwm_chip *pc, unsigned int offset)
+{
+ return readl(pc->regs + (offset << 4));
+}
+
+static inline void pwm_writel(struct tegra_pwm_chip *pc, unsigned int offset, u32 value)
+{
+ writel(value, pc->regs + (offset << 4));
+}
+
+static int tegra_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct tegra_pwm_chip *pc = to_tegra_pwm_chip(chip);
+ unsigned long long c = duty_ns;
+ unsigned long rate, required_clk_rate;
+ u32 val = 0;
+ int err;
+
+ /*
+ * Convert from duty_ns / period_ns to a fixed number of duty ticks
+ * per (1 << PWM_DUTY_WIDTH) cycles and make sure to round to the
+ * nearest integer during division.
+ */
+ c *= (1 << PWM_DUTY_WIDTH);
+ c = DIV_ROUND_CLOSEST_ULL(c, period_ns);
+
+ val = (u32)c << PWM_DUTY_SHIFT;
+
+ /*
+ * min period = max clock limit >> PWM_DUTY_WIDTH
+ */
+ if (period_ns < pc->min_period_ns)
+ return -EINVAL;
+
+ /*
+ * Compute the prescaler value for which (1 << PWM_DUTY_WIDTH)
+ * cycles at the PWM clock rate will take period_ns nanoseconds.
+ *
+ * num_channels: If single instance of PWM controller has multiple
+ * channels (e.g. Tegra210 or older) then it is not possible to
+ * configure separate clock rates to each of the channels, in such
+ * case the value stored during probe will be referred.
+ *
+ * If every PWM controller instance has one channel respectively, i.e.
+ * nums_channels == 1 then only the clock rate can be modified
+ * dynamically (e.g. Tegra186 or Tegra194).
+ */
+ if (pc->soc->num_channels == 1) {
+ /*
+ * Rate is multiplied with 2^PWM_DUTY_WIDTH so that it matches
+ * with the maximum possible rate that the controller can
+ * provide. Any further lower value can be derived by setting
+ * PFM bits[0:12].
+ *
+ * required_clk_rate is a reference rate for source clock and
+ * it is derived based on user requested period. By setting the
+ * source clock rate as required_clk_rate, PWM controller will
+ * be able to configure the requested period.
+ */
+ required_clk_rate = DIV_ROUND_UP_ULL((u64)NSEC_PER_SEC << PWM_DUTY_WIDTH,
+ period_ns);
+
+ if (required_clk_rate > clk_round_rate(pc->clk, required_clk_rate))
+ /*
+ * required_clk_rate is a lower bound for the input
+ * rate; for lower rates there is no value for PWM_SCALE
+ * that yields a period less than or equal to the
+ * requested period. Hence, for lower rates, double the
+ * required_clk_rate to get a clock rate that can meet
+ * the requested period.
+ */
+ required_clk_rate *= 2;
+
+ err = dev_pm_opp_set_rate(pc->dev, required_clk_rate);
+ if (err < 0)
+ return -EINVAL;
+
+ /* Store the new rate for further references */
+ pc->clk_rate = clk_get_rate(pc->clk);
+ }
+
+ /* Consider precision in PWM_SCALE_WIDTH rate calculation */
+ rate = mul_u64_u64_div_u64(pc->clk_rate, period_ns,
+ (u64)NSEC_PER_SEC << PWM_DUTY_WIDTH);
+
+ /*
+ * Since the actual PWM divider is the register's frequency divider
+ * field plus 1, we need to decrement to get the correct value to
+ * write to the register.
+ */
+ if (rate > 0)
+ rate--;
+ else
+ return -EINVAL;
+
+ /*
+ * Make sure that the rate will fit in the register's frequency
+ * divider field.
+ */
+ if (rate >> PWM_SCALE_WIDTH)
+ return -EINVAL;
+
+ val |= rate << PWM_SCALE_SHIFT;
+
+ /*
+ * If the PWM channel is disabled, make sure to turn on the clock
+ * before writing the register. Otherwise, keep it enabled.
+ */
+ if (!pwm_is_enabled(pwm)) {
+ err = pm_runtime_resume_and_get(pc->dev);
+ if (err)
+ return err;
+ } else
+ val |= PWM_ENABLE;
+
+ pwm_writel(pc, pwm->hwpwm, val);
+
+ /*
+ * If the PWM is not enabled, turn the clock off again to save power.
+ */
+ if (!pwm_is_enabled(pwm))
+ pm_runtime_put(pc->dev);
+
+ return 0;
+}
+
+static int tegra_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct tegra_pwm_chip *pc = to_tegra_pwm_chip(chip);
+ int rc = 0;
+ u32 val;
+
+ rc = pm_runtime_resume_and_get(pc->dev);
+ if (rc)
+ return rc;
+
+ val = pwm_readl(pc, pwm->hwpwm);
+ val |= PWM_ENABLE;
+ pwm_writel(pc, pwm->hwpwm, val);
+
+ return 0;
+}
+
+static void tegra_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ struct tegra_pwm_chip *pc = to_tegra_pwm_chip(chip);
+ u32 val;
+
+ val = pwm_readl(pc, pwm->hwpwm);
+ val &= ~PWM_ENABLE;
+ pwm_writel(pc, pwm->hwpwm, val);
+
+ pm_runtime_put_sync(pc->dev);
+}
+
+static int tegra_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
+ const struct pwm_state *state)
+{
+ int err;
+ bool enabled = pwm->state.enabled;
+
+ if (state->polarity != PWM_POLARITY_NORMAL)
+ return -EINVAL;
+
+ if (!state->enabled) {
+ if (enabled)
+ tegra_pwm_disable(chip, pwm);
+
+ return 0;
+ }
+
+ err = tegra_pwm_config(pwm->chip, pwm, state->duty_cycle, state->period);
+ if (err)
+ return err;
+
+ if (!enabled)
+ err = tegra_pwm_enable(chip, pwm);
+
+ return err;
+}
+
+static const struct pwm_ops tegra_pwm_ops = {
+ .apply = tegra_pwm_apply,
+ .owner = THIS_MODULE,
+};
+
+static int tegra_pwm_probe(struct platform_device *pdev)
+{
+ struct tegra_pwm_chip *pc;
+ int ret;
+
+ pc = devm_kzalloc(&pdev->dev, sizeof(*pc), GFP_KERNEL);
+ if (!pc)
+ return -ENOMEM;
+
+ pc->soc = of_device_get_match_data(&pdev->dev);
+ pc->dev = &pdev->dev;
+
+ pc->regs = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(pc->regs))
+ return PTR_ERR(pc->regs);
+
+ platform_set_drvdata(pdev, pc);
+
+ pc->clk = devm_clk_get(&pdev->dev, NULL);
+ if (IS_ERR(pc->clk))
+ return PTR_ERR(pc->clk);
+
+ ret = devm_tegra_core_dev_init_opp_table_common(&pdev->dev);
+ if (ret)
+ return ret;
+
+ pm_runtime_enable(&pdev->dev);
+ ret = pm_runtime_resume_and_get(&pdev->dev);
+ if (ret)
+ return ret;
+
+ /* Set maximum frequency of the IP */
+ ret = dev_pm_opp_set_rate(pc->dev, pc->soc->max_frequency);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "Failed to set max frequency: %d\n", ret);
+ goto put_pm;
+ }
+
+ /*
+ * The requested and configured frequency may differ due to
+ * clock register resolutions. Get the configured frequency
+ * so that PWM period can be calculated more accurately.
+ */
+ pc->clk_rate = clk_get_rate(pc->clk);
+
+ /* Set minimum limit of PWM period for the IP */
+ pc->min_period_ns =
+ (NSEC_PER_SEC / (pc->soc->max_frequency >> PWM_DUTY_WIDTH)) + 1;
+
+ pc->rst = devm_reset_control_get_exclusive(&pdev->dev, "pwm");
+ if (IS_ERR(pc->rst)) {
+ ret = PTR_ERR(pc->rst);
+ dev_err(&pdev->dev, "Reset control is not found: %d\n", ret);
+ goto put_pm;
+ }
+
+ reset_control_deassert(pc->rst);
+
+ pc->chip.dev = &pdev->dev;
+ pc->chip.ops = &tegra_pwm_ops;
+ pc->chip.npwm = pc->soc->num_channels;
+
+ ret = pwmchip_add(&pc->chip);
+ if (ret < 0) {
+ dev_err(&pdev->dev, "pwmchip_add() failed: %d\n", ret);
+ reset_control_assert(pc->rst);
+ goto put_pm;
+ }
+
+ pm_runtime_put(&pdev->dev);
+
+ return 0;
+put_pm:
+ pm_runtime_put_sync_suspend(&pdev->dev);
+ pm_runtime_force_suspend(&pdev->dev);
+ return ret;
+}
+
+static void tegra_pwm_remove(struct platform_device *pdev)
+{
+ struct tegra_pwm_chip *pc = platform_get_drvdata(pdev);
+
+ pwmchip_remove(&pc->chip);
+
+ reset_control_assert(pc->rst);
+
+ pm_runtime_force_suspend(&pdev->dev);
+}
+
+static int __maybe_unused tegra_pwm_runtime_suspend(struct device *dev)
+{
+ struct tegra_pwm_chip *pc = dev_get_drvdata(dev);
+ int err;
+
+ clk_disable_unprepare(pc->clk);
+
+ err = pinctrl_pm_select_sleep_state(dev);
+ if (err) {
+ clk_prepare_enable(pc->clk);
+ return err;
+ }
+
+ return 0;
+}
+
+static int __maybe_unused tegra_pwm_runtime_resume(struct device *dev)
+{
+ struct tegra_pwm_chip *pc = dev_get_drvdata(dev);
+ int err;
+
+ err = pinctrl_pm_select_default_state(dev);
+ if (err)
+ return err;
+
+ err = clk_prepare_enable(pc->clk);
+ if (err) {
+ pinctrl_pm_select_sleep_state(dev);
+ return err;
+ }
+
+ return 0;
+}
+
+static const struct tegra_pwm_soc tegra20_pwm_soc = {
+ .num_channels = 4,
+ .max_frequency = 48000000UL,
+};
+
+static const struct tegra_pwm_soc tegra186_pwm_soc = {
+ .num_channels = 1,
+ .max_frequency = 102000000UL,
+};
+
+static const struct tegra_pwm_soc tegra194_pwm_soc = {
+ .num_channels = 1,
+ .max_frequency = 408000000UL,
+};
+
+static const struct of_device_id tegra_pwm_of_match[] = {
+ { .compatible = "nvidia,tegra20-pwm", .data = &tegra20_pwm_soc },
+ { .compatible = "nvidia,tegra186-pwm", .data = &tegra186_pwm_soc },
+ { .compatible = "nvidia,tegra194-pwm", .data = &tegra194_pwm_soc },
+ { }
+};
+MODULE_DEVICE_TABLE(of, tegra_pwm_of_match);
+
+static const struct dev_pm_ops tegra_pwm_pm_ops = {
+ SET_RUNTIME_PM_OPS(tegra_pwm_runtime_suspend, tegra_pwm_runtime_resume,
+ NULL)
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+};
+
+static struct platform_driver tegra_pwm_driver = {
+ .driver = {
+ .name = "tegra-pwm",
+ .of_match_table = tegra_pwm_of_match,
+ .pm = &tegra_pwm_pm_ops,
+ },
+ .probe = tegra_pwm_probe,
+ .remove_new = tegra_pwm_remove,
+};
+
+module_platform_driver(tegra_pwm_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Sandipan Patra <spatra@nvidia.com>");
+MODULE_DESCRIPTION("Tegra PWM controller driver");
+MODULE_ALIAS("platform:tegra-pwm");