[PATCH v2 4/7] PWM: add pwm driver for stm32 plaftorm
Benjamin Gaignard
benjamin.gaignard at linaro.org
Thu Nov 24 07:14:20 PST 2016
This driver add support for pwm driver on stm32 platform.
The SoC have multiple instances of the hardware IP and each
of them could have small differences: number of channels,
complementary output, counter register size...
Use DT parameters to handle those differentes configuration
version 2:
- only keep one comptatible
- use DT paramaters to discover hardware block configuration
Signed-off-by: Benjamin Gaignard <benjamin.gaignard at st.com>
---
drivers/pwm/Kconfig | 8 ++
drivers/pwm/Makefile | 1 +
drivers/pwm/pwm-stm32.c | 285 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 294 insertions(+)
create mode 100644 drivers/pwm/pwm-stm32.c
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index bf01288..a89fdba 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -388,6 +388,14 @@ config PWM_STI
To compile this driver as a module, choose M here: the module
will be called pwm-sti.
+config PWM_STM32
+ bool "STMicroelectronics STM32 PWM"
+ depends on ARCH_STM32
+ depends on OF
+ select MFD_STM32_GP_TIMER
+ help
+ Generic PWM framework driver for STM32 SoCs.
+
config PWM_STMPE
bool "STMPE expander PWM export"
depends on MFD_STMPE
diff --git a/drivers/pwm/Makefile b/drivers/pwm/Makefile
index 1194c54..5aa9308 100644
--- a/drivers/pwm/Makefile
+++ b/drivers/pwm/Makefile
@@ -37,6 +37,7 @@ obj-$(CONFIG_PWM_ROCKCHIP) += pwm-rockchip.o
obj-$(CONFIG_PWM_SAMSUNG) += pwm-samsung.o
obj-$(CONFIG_PWM_SPEAR) += pwm-spear.o
obj-$(CONFIG_PWM_STI) += pwm-sti.o
+obj-$(CONFIG_PWM_STM32) += pwm-stm32.o
obj-$(CONFIG_PWM_STMPE) += pwm-stmpe.o
obj-$(CONFIG_PWM_SUN4I) += pwm-sun4i.o
obj-$(CONFIG_PWM_TEGRA) += pwm-tegra.o
diff --git a/drivers/pwm/pwm-stm32.c b/drivers/pwm/pwm-stm32.c
new file mode 100644
index 0000000..a362f63
--- /dev/null
+++ b/drivers/pwm/pwm-stm32.c
@@ -0,0 +1,285 @@
+/*
+ * Copyright (C) STMicroelectronics 2016
+ * Author: Gerald Baeza <gerald.baeza at st.com>
+ * License terms: GNU General Public License (GPL), version 2
+ *
+ * Inspired by timer-stm32.c from Maxime Coquelin
+ * pwm-atmel.c from Bo Shen
+ */
+
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pwm.h>
+
+#include <linux/mfd/stm32-gptimer.h>
+
+#define DRIVER_NAME "stm32-pwm"
+
+#define CAP_COMPLEMENTARY BIT(0)
+#define CAP_32BITS_COUNTER BIT(1)
+#define CAP_BREAKINPUT BIT(2)
+#define CAP_BREAKINPUT_POLARITY BIT(3)
+
+struct stm32_pwm_dev {
+ struct device *dev;
+ struct clk *clk;
+ struct regmap *regmap;
+ struct pwm_chip chip;
+ int caps;
+ int npwm;
+ u32 polarity;
+};
+
+#define to_stm32_pwm_dev(x) container_of(chip, struct stm32_pwm_dev, chip)
+
+static u32 __active_channels(struct stm32_pwm_dev *pwm_dev)
+{
+ u32 ccer;
+
+ regmap_read(pwm_dev->regmap, TIM_CCER, &ccer);
+
+ return ccer & TIM_CCER_CCXE;
+}
+
+static int write_ccrx(struct stm32_pwm_dev *dev, struct pwm_device *pwm,
+ u32 ccr)
+{
+ switch (pwm->hwpwm) {
+ case 0:
+ return regmap_write(dev->regmap, TIM_CCR1, ccr);
+ case 1:
+ return regmap_write(dev->regmap, TIM_CCR2, ccr);
+ case 2:
+ return regmap_write(dev->regmap, TIM_CCR3, ccr);
+ case 3:
+ return regmap_write(dev->regmap, TIM_CCR4, ccr);
+ }
+ return -EINVAL;
+}
+
+static int stm32_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
+ int duty_ns, int period_ns)
+{
+ struct stm32_pwm_dev *dev = to_stm32_pwm_dev(chip);
+ unsigned long long prd, div, dty;
+ int prescaler = 0;
+ u32 max_arr = 0xFFFF, ccmr, mask, shift, bdtr;
+
+ if (dev->caps & CAP_32BITS_COUNTER)
+ max_arr = 0xFFFFFFFF;
+
+ /* Period and prescaler values depends of clock rate */
+ div = (unsigned long long)clk_get_rate(dev->clk) * period_ns;
+
+ do_div(div, NSEC_PER_SEC);
+ prd = div;
+
+ while (div > max_arr) {
+ prescaler++;
+ div = prd;
+ do_div(div, (prescaler + 1));
+ }
+ prd = div;
+
+ if (prescaler > MAX_TIM_PSC) {
+ dev_err(chip->dev, "prescaler exceeds the maximum value\n");
+ return -EINVAL;
+ }
+
+ /* All channels share the same prescaler and counter so
+ * when two channels are active at the same we can't change them
+ */
+ if (__active_channels(dev) & ~(1 << pwm->hwpwm * 4)) {
+ u32 psc, arr;
+
+ regmap_read(dev->regmap, TIM_PSC, &psc);
+ regmap_read(dev->regmap, TIM_ARR, &arr);
+
+ if ((psc != prescaler) || (arr != prd - 1))
+ return -EINVAL;
+ }
+
+ regmap_write(dev->regmap, TIM_PSC, prescaler);
+ regmap_write(dev->regmap, TIM_ARR, prd - 1);
+ regmap_update_bits(dev->regmap, TIM_CR1, TIM_CR1_ARPE, TIM_CR1_ARPE);
+
+ /* Calculate the duty cycles */
+ dty = prd * duty_ns;
+ do_div(dty, period_ns);
+
+ write_ccrx(dev, pwm, dty);
+
+ /* Configure output mode */
+ shift = (pwm->hwpwm & 0x1) * 8;
+ ccmr = (TIM_CCMR_PE | TIM_CCMR_M1) << shift;
+ mask = 0xFF << shift;
+
+ if (pwm->hwpwm & 0x2)
+ regmap_update_bits(dev->regmap, TIM_CCMR2, mask, ccmr);
+ else
+ regmap_update_bits(dev->regmap, TIM_CCMR1, mask, ccmr);
+
+ if (!(dev->caps & CAP_BREAKINPUT))
+ return 0;
+
+ bdtr = TIM_BDTR_MOE | TIM_BDTR_AOE;
+
+ if (dev->caps & CAP_BREAKINPUT_POLARITY)
+ bdtr |= TIM_BDTR_BKE;
+
+ if (dev->polarity)
+ bdtr |= TIM_BDTR_BKP;
+
+ regmap_update_bits(dev->regmap, TIM_BDTR,
+ TIM_BDTR_MOE | TIM_BDTR_AOE |
+ TIM_BDTR_BKP | TIM_BDTR_BKE,
+ bdtr);
+
+ return 0;
+}
+
+static int stm32_pwm_set_polarity(struct pwm_chip *chip, struct pwm_device *pwm,
+ enum pwm_polarity polarity)
+{
+ u32 mask;
+ struct stm32_pwm_dev *dev = to_stm32_pwm_dev(chip);
+
+ mask = TIM_CCER_CC1P << (pwm->hwpwm * 4);
+ if (dev->caps & CAP_COMPLEMENTARY)
+ mask |= TIM_CCER_CC1NP << (pwm->hwpwm * 4);
+
+ regmap_update_bits(dev->regmap, TIM_CCER, mask,
+ polarity == PWM_POLARITY_NORMAL ? 0 : mask);
+
+ return 0;
+}
+
+static int stm32_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ u32 mask;
+ struct stm32_pwm_dev *dev = to_stm32_pwm_dev(chip);
+
+ clk_enable(dev->clk);
+
+ /* Enable channel */
+ mask = TIM_CCER_CC1E << (pwm->hwpwm * 4);
+ if (dev->caps & CAP_COMPLEMENTARY)
+ mask |= TIM_CCER_CC1NE << (pwm->hwpwm * 4);
+
+ regmap_update_bits(dev->regmap, TIM_CCER, mask, mask);
+
+ /* Make sure that registers are updated */
+ regmap_update_bits(dev->regmap, TIM_EGR, TIM_EGR_UG, TIM_EGR_UG);
+
+ /* Enable controller */
+ regmap_update_bits(dev->regmap, TIM_CR1, TIM_CR1_CEN, TIM_CR1_CEN);
+
+ return 0;
+}
+
+static void stm32_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
+{
+ u32 mask;
+ struct stm32_pwm_dev *dev = to_stm32_pwm_dev(chip);
+
+ /* Disable channel */
+ mask = TIM_CCER_CC1E << (pwm->hwpwm * 4);
+ if (dev->caps & CAP_COMPLEMENTARY)
+ mask |= TIM_CCER_CC1NE << (pwm->hwpwm * 4);
+
+ regmap_update_bits(dev->regmap, TIM_CCER, mask, 0);
+
+ /* When all channels are disabled, we can disable the controller */
+ if (!__active_channels(dev))
+ regmap_update_bits(dev->regmap, TIM_CR1, TIM_CR1_CEN, 0);
+
+ clk_disable(dev->clk);
+}
+
+static const struct pwm_ops stm32pwm_ops = {
+ .config = stm32_pwm_config,
+ .set_polarity = stm32_pwm_set_polarity,
+ .enable = stm32_pwm_enable,
+ .disable = stm32_pwm_disable,
+};
+
+static int stm32_pwm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *np = dev->of_node;
+ struct stm32_gptimer_dev *mfd = dev_get_drvdata(pdev->dev.parent);
+ struct stm32_pwm_dev *pwm;
+ int ret;
+
+ pwm = devm_kzalloc(dev, sizeof(*pwm), GFP_KERNEL);
+ if (!pwm)
+ return -ENOMEM;
+
+ pwm->regmap = mfd->regmap;
+ pwm->clk = mfd->clk;
+
+ if (!pwm->regmap || !pwm->clk)
+ return -EINVAL;
+
+ if (of_property_read_bool(np, "st,complementary"))
+ pwm->caps |= CAP_COMPLEMENTARY;
+
+ if (of_property_read_bool(np, "st,32bits-counter"))
+ pwm->caps |= CAP_32BITS_COUNTER;
+
+ if (of_property_read_bool(np, "st,breakinput"))
+ pwm->caps |= CAP_BREAKINPUT;
+
+ if (!of_property_read_u32(np, "st,breakinput-polarity", &pwm->polarity))
+ pwm->caps |= CAP_BREAKINPUT_POLARITY;
+
+ of_property_read_u32(np, "st,pwm-num-chan", &pwm->npwm);
+
+ pwm->chip.base = -1;
+ pwm->chip.dev = dev;
+ pwm->chip.ops = &stm32pwm_ops;
+ pwm->chip.npwm = pwm->npwm;
+
+ ret = pwmchip_add(&pwm->chip);
+ if (ret < 0)
+ return ret;
+
+ platform_set_drvdata(pdev, pwm);
+
+ return 0;
+}
+
+static int stm32_pwm_remove(struct platform_device *pdev)
+{
+ struct stm32_pwm_dev *pwm = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = 0; i < pwm->npwm; i++)
+ pwm_disable(&pwm->chip.pwms[i]);
+
+ pwmchip_remove(&pwm->chip);
+
+ return 0;
+}
+
+static const struct of_device_id stm32_pwm_of_match[] = {
+ {
+ .compatible = "st,stm32-pwm",
+ },
+};
+MODULE_DEVICE_TABLE(of, stm32_pwm_of_match);
+
+static struct platform_driver stm32_pwm_driver = {
+ .probe = stm32_pwm_probe,
+ .remove = stm32_pwm_remove,
+ .driver = {
+ .name = DRIVER_NAME,
+ .of_match_table = stm32_pwm_of_match,
+ },
+};
+module_platform_driver(stm32_pwm_driver);
+
+MODULE_ALIAS("platform:" DRIVER_NAME);
+MODULE_DESCRIPTION("STMicroelectronics STM32 PWM driver");
+MODULE_LICENSE("GPL");
--
1.9.1
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