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pwm: Changes for v4.5-rc1
This set of changes contains a new driver for OMAP (using the dual-mode timers) as well as an assortment of fixes all across the board. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQIcBAABCAAGBQJWoOb9AAoJEN0jrNd/PrOh6e8P/2fIW49qBk1bSyzWZ8nI9ifx rUz1hDpFaOwvOOp+JZ/PCF8l11hr99CpsfZm8tWp3J2lLsahDv362Bp235lOrZk2 aQ4MaKUAvfzcqmCkeoXFj1SJLgUacerpdWBklTQJpyqoT6bYoyY89fXtaVELI4jF V65aSBKF2jh2BlEvmKiMa666xd2jAux59kLRhajJB4MUr2NY5aTmPa9oHZVGa1Qi QXEjLp5elGnnIpzN4f7ZuIkgCOceB35HVJoRgGq068YZO2PZDNXn4GSXval85hRZ eBHX0btkQ8itQ9IJz1gPtgOxnQuZO5k70bfNSMsG4CDJfNjwMAibFs7UfThnnPZK aS7N5SMXt6Yt5H6OSGDR66emeyciYy/+8/0aToscuu1NiTxAUkGN//kEv4IPABn8 DMWm78PvaxVlZzXLKUkWYPgT7kjvnFQRzopQjmMtY15FUU28cpd+CZqlMlGJ4tCh EIA6g6v16BnYyfNI8ZcffoTsfJ7B7uKUnEMiD/gGJ5OrYl8GRT/dvpsX51/hkiQS o/vD2aokpEcnY/1mHSQAWdEuwcV9UVi3pplfhRLk1OkJylBc19JUbqbRY9Mx5p5S yhgGMZ5tf0jraevr1qy5h0pZXZkQlbykZT2ljDW+BhbpgHyHInF0Rkib+FzUWcb1 LBsqAkqpBcGKhx4vUKvy =YH/K -----END PGP SIGNATURE----- Merge tag 'pwm/for-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm Pull pwm updates from Thierry Reding: "This set of changes contains a new driver for OMAP (using the dual-mode timers) as well as an assortment of fixes all across the board" * tag 'pwm/for-4.5-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: pwm: Mark all devices as "might sleep" pwm: omap-dmtimer: Potential NULL dereference on error pwm: add HAS_IOMEM dependency to PWM_FSL_FTM pwm: Add PWM driver for OMAP using dual-mode timers pwm: rcar: Improve accuracy of frequency division setting pwm: lpc32xx: return ERANGE, if requested period is not supported pwm: lpc32xx: fix and simplify duty cycle and period calculations pwm: lpc32xx: make device usable with common clock framework pwm: lpc32xx: correct number of PWM channels from 2 to 1 dt: lpc32xx: pwm: update documentation of LPC32xx PWM device dt: lpc32xx: pwm: correct LPC32xx PWM device node example pwm: fsl-ftm: Fix clock enable/disable when using PM pwm: lpss: Rework the sequence of programming PWM_SW_UPDATE pwm: lpss: Select core part automatically pwm: lpss: Update PWM setting for Broxton pwm: bcm2835: Fix email address specification pwm: bcm2835: Prevent division by zero pwm: bcm2835: Calculate scaler in ->config() pwm: lpss: Remove ->free() callback
This commit is contained in:
Linus Torvalds
commit
859e762544
@ -6,7 +6,12 @@ Required properties:
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Examples:
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pwm@0x4005C000 {
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pwm@4005c000 {
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compatible = "nxp,lpc3220-pwm";
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reg = <0x4005C000 0x8>;
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reg = <0x4005c000 0x4>;
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};
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pwm@4005c004 {
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compatible = "nxp,lpc3220-pwm";
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reg = <0x4005c004 0x4>;
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};
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18
Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt
Normal file
18
Documentation/devicetree/bindings/pwm/pwm-omap-dmtimer.txt
Normal file
@ -0,0 +1,18 @@
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* OMAP PWM for dual-mode timers
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Required properties:
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- compatible: Shall contain "ti,omap-dmtimer-pwm".
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- ti,timers: phandle to PWM capable OMAP timer. See arm/omap/timer.txt for info
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about these timers.
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- #pwm-cells: Should be 3. See pwm.txt in this directory for a description of
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the cells format.
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Optional properties:
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- ti,prescaler: Should be a value between 0 and 7, see the timers datasheet
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Example:
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pwm9: dmtimer-pwm@9 {
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compatible = "ti,omap-dmtimer-pwm";
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ti,timers = <&timer9>;
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#pwm-cells = <3>;
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};
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@ -148,6 +148,7 @@ config PWM_EP93XX
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config PWM_FSL_FTM
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tristate "Freescale FlexTimer Module (FTM) PWM support"
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depends on HAS_IOMEM
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depends on OF
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select REGMAP_MMIO
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help
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@ -222,18 +223,12 @@ config PWM_LPC32XX
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will be called pwm-lpc32xx.
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config PWM_LPSS
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tristate "Intel LPSS PWM support"
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depends on X86
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help
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Generic PWM framework driver for Intel Low Power Subsystem PWM
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controller.
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To compile this driver as a module, choose M here: the module
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will be called pwm-lpss.
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tristate
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config PWM_LPSS_PCI
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tristate "Intel LPSS PWM PCI driver"
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depends on PWM_LPSS && PCI
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depends on X86 && PCI
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select PWM_LPSS
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help
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The PCI driver for Intel Low Power Subsystem PWM controller.
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@ -242,7 +237,8 @@ config PWM_LPSS_PCI
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config PWM_LPSS_PLATFORM
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tristate "Intel LPSS PWM platform driver"
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depends on PWM_LPSS && ACPI
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depends on X86 && ACPI
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select PWM_LPSS
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help
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The platform driver for Intel Low Power Subsystem PWM controller.
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@ -270,6 +266,15 @@ config PWM_MXS
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To compile this driver as a module, choose M here: the module
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will be called pwm-mxs.
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config PWM_OMAP_DMTIMER
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tristate "OMAP Dual-Mode Timer PWM support"
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depends on OF && ARCH_OMAP && OMAP_DM_TIMER
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help
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Generic PWM framework driver for OMAP Dual-Mode Timer PWM output
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To compile this driver as a module, choose M here: the module
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will be called pwm-omap-dmtimer
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config PWM_PCA9685
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tristate "NXP PCA9685 PWM driver"
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depends on I2C
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@ -24,6 +24,7 @@ obj-$(CONFIG_PWM_LPSS_PCI) += pwm-lpss-pci.o
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obj-$(CONFIG_PWM_LPSS_PLATFORM) += pwm-lpss-platform.o
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obj-$(CONFIG_PWM_MTK_DISP) += pwm-mtk-disp.o
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obj-$(CONFIG_PWM_MXS) += pwm-mxs.o
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obj-$(CONFIG_PWM_OMAP_DMTIMER) += pwm-omap-dmtimer.o
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obj-$(CONFIG_PWM_PCA9685) += pwm-pca9685.o
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obj-$(CONFIG_PWM_PUV3) += pwm-puv3.o
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obj-$(CONFIG_PWM_PXA) += pwm-pxa.o
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@ -889,7 +889,7 @@ EXPORT_SYMBOL_GPL(devm_pwm_put);
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*/
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bool pwm_can_sleep(struct pwm_device *pwm)
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{
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return pwm->chip->can_sleep;
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return true;
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}
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EXPORT_SYMBOL_GPL(pwm_can_sleep);
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@ -29,7 +29,6 @@
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struct bcm2835_pwm {
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struct pwm_chip chip;
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struct device *dev;
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unsigned long scaler;
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void __iomem *base;
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struct clk *clk;
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};
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@ -66,6 +65,15 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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int duty_ns, int period_ns)
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{
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struct bcm2835_pwm *pc = to_bcm2835_pwm(chip);
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unsigned long rate = clk_get_rate(pc->clk);
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unsigned long scaler;
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if (!rate) {
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dev_err(pc->dev, "failed to get clock rate\n");
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return -EINVAL;
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}
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scaler = NSEC_PER_SEC / rate;
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if (period_ns <= MIN_PERIOD) {
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dev_err(pc->dev, "period %d not supported, minimum %d\n",
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@ -73,8 +81,8 @@ static int bcm2835_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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return -EINVAL;
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}
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writel(duty_ns / pc->scaler, pc->base + DUTY(pwm->hwpwm));
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writel(period_ns / pc->scaler, pc->base + PERIOD(pwm->hwpwm));
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writel(duty_ns / scaler, pc->base + DUTY(pwm->hwpwm));
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writel(period_ns / scaler, pc->base + PERIOD(pwm->hwpwm));
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return 0;
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}
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@ -156,8 +164,6 @@ static int bcm2835_pwm_probe(struct platform_device *pdev)
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if (ret)
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return ret;
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pc->scaler = NSEC_PER_SEC / clk_get_rate(pc->clk);
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pc->chip.dev = &pdev->dev;
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pc->chip.ops = &bcm2835_pwm_ops;
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pc->chip.npwm = 2;
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@ -200,6 +206,6 @@ static struct platform_driver bcm2835_pwm_driver = {
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};
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module_platform_driver(bcm2835_pwm_driver);
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MODULE_AUTHOR("Bart Tanghe <bart.tanghe@thomasmore.be");
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MODULE_AUTHOR("Bart Tanghe <bart.tanghe@thomasmore.be>");
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MODULE_DESCRIPTION("Broadcom BCM2835 PWM driver");
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MODULE_LICENSE("GPL v2");
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@ -80,7 +80,6 @@ struct fsl_pwm_chip {
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struct mutex lock;
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unsigned int use_count;
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unsigned int cnt_select;
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unsigned int clk_ps;
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@ -300,9 +299,6 @@ static int fsl_counter_clock_enable(struct fsl_pwm_chip *fpc)
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{
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int ret;
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if (fpc->use_count++ != 0)
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return 0;
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/* select counter clock source */
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regmap_update_bits(fpc->regmap, FTM_SC, FTM_SC_CLK_MASK,
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FTM_SC_CLK(fpc->cnt_select));
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@ -334,25 +330,6 @@ static int fsl_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
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return ret;
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}
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static void fsl_counter_clock_disable(struct fsl_pwm_chip *fpc)
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{
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/*
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* already disabled, do nothing
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*/
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if (fpc->use_count == 0)
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return;
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/* there are still users, so can't disable yet */
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if (--fpc->use_count > 0)
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return;
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/* no users left, disable PWM counter clock */
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regmap_update_bits(fpc->regmap, FTM_SC, FTM_SC_CLK_MASK, 0);
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clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
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clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
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}
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static void fsl_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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{
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struct fsl_pwm_chip *fpc = to_fsl_chip(chip);
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@ -362,7 +339,8 @@ static void fsl_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
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regmap_update_bits(fpc->regmap, FTM_OUTMASK, BIT(pwm->hwpwm),
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BIT(pwm->hwpwm));
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fsl_counter_clock_disable(fpc);
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clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
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clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
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regmap_read(fpc->regmap, FTM_OUTMASK, &val);
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if ((val & 0xFF) == 0xFF)
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@ -492,17 +470,24 @@ static int fsl_pwm_remove(struct platform_device *pdev)
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static int fsl_pwm_suspend(struct device *dev)
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{
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struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
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u32 val;
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int i;
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regcache_cache_only(fpc->regmap, true);
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regcache_mark_dirty(fpc->regmap);
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/* read from cache */
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regmap_read(fpc->regmap, FTM_OUTMASK, &val);
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if ((val & 0xFF) != 0xFF) {
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for (i = 0; i < fpc->chip.npwm; i++) {
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struct pwm_device *pwm = &fpc->chip.pwms[i];
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if (!test_bit(PWMF_REQUESTED, &pwm->flags))
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continue;
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clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
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if (!pwm_is_enabled(pwm))
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continue;
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clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_CNTEN]);
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clk_disable_unprepare(fpc->clk[fpc->cnt_select]);
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clk_disable_unprepare(fpc->clk[FSL_PWM_CLK_SYS]);
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}
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return 0;
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@ -511,12 +496,19 @@ static int fsl_pwm_suspend(struct device *dev)
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static int fsl_pwm_resume(struct device *dev)
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{
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struct fsl_pwm_chip *fpc = dev_get_drvdata(dev);
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u32 val;
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int i;
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for (i = 0; i < fpc->chip.npwm; i++) {
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struct pwm_device *pwm = &fpc->chip.pwms[i];
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if (!test_bit(PWMF_REQUESTED, &pwm->flags))
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continue;
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/* read from cache */
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regmap_read(fpc->regmap, FTM_OUTMASK, &val);
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if ((val & 0xFF) != 0xFF) {
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clk_prepare_enable(fpc->clk[FSL_PWM_CLK_SYS]);
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if (!pwm_is_enabled(pwm))
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continue;
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clk_prepare_enable(fpc->clk[fpc->cnt_select]);
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clk_prepare_enable(fpc->clk[FSL_PWM_CLK_CNTEN]);
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}
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@ -24,9 +24,7 @@ struct lpc32xx_pwm_chip {
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void __iomem *base;
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};
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#define PWM_ENABLE (1 << 31)
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#define PWM_RELOADV(x) (((x) & 0xFF) << 8)
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#define PWM_DUTY(x) ((x) & 0xFF)
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#define PWM_ENABLE BIT(31)
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#define to_lpc32xx_pwm_chip(_chip) \
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container_of(_chip, struct lpc32xx_pwm_chip, chip)
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@ -38,40 +36,27 @@ static int lpc32xx_pwm_config(struct pwm_chip *chip, struct pwm_device *pwm,
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unsigned long long c;
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int period_cycles, duty_cycles;
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u32 val;
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c = clk_get_rate(lpc32xx->clk);
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c = clk_get_rate(lpc32xx->clk) / 256;
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c = c * period_ns;
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do_div(c, NSEC_PER_SEC);
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/* The highest acceptable divisor is 256, which is represented by 0 */
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period_cycles = div64_u64(c * period_ns,
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(unsigned long long)NSEC_PER_SEC * 256);
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if (!period_cycles || period_cycles > 256)
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return -ERANGE;
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if (period_cycles == 256)
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period_cycles = 0;
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/* Handle high and low extremes */
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if (c == 0)
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c = 1;
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if (c > 255)
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c = 0; /* 0 set division by 256 */
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period_cycles = c;
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/* The duty-cycle value is as follows:
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*
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* DUTY-CYCLE HIGH LEVEL
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* 1 99.9%
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* 25 90.0%
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* 128 50.0%
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* 220 10.0%
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* 255 0.1%
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* 0 0.0%
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*
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* In other words, the register value is duty-cycle % 256 with
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* duty-cycle in the range 1-256.
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*/
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c = 256 * duty_ns;
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do_div(c, period_ns);
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if (c > 255)
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c = 255;
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duty_cycles = 256 - c;
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/* Compute 256 x #duty/period value and care for corner cases */
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duty_cycles = div64_u64((unsigned long long)(period_ns - duty_ns) * 256,
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period_ns);
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if (!duty_cycles)
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duty_cycles = 1;
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if (duty_cycles > 255)
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duty_cycles = 255;
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val = readl(lpc32xx->base + (pwm->hwpwm << 2));
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val &= ~0xFFFF;
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val |= PWM_RELOADV(period_cycles) | PWM_DUTY(duty_cycles);
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val |= (period_cycles << 8) | duty_cycles;
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writel(val, lpc32xx->base + (pwm->hwpwm << 2));
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return 0;
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@ -83,7 +68,7 @@ static int lpc32xx_pwm_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
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u32 val;
|
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int ret;
|
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|
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ret = clk_enable(lpc32xx->clk);
|
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ret = clk_prepare_enable(lpc32xx->clk);
|
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if (ret)
|
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return ret;
|
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|
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@ -103,7 +88,7 @@ static void lpc32xx_pwm_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
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val &= ~PWM_ENABLE;
|
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writel(val, lpc32xx->base + (pwm->hwpwm << 2));
|
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|
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clk_disable(lpc32xx->clk);
|
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clk_disable_unprepare(lpc32xx->clk);
|
||||
}
|
||||
|
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static const struct pwm_ops lpc32xx_pwm_ops = {
|
||||
@ -134,7 +119,7 @@ static int lpc32xx_pwm_probe(struct platform_device *pdev)
|
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|
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lpc32xx->chip.dev = &pdev->dev;
|
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lpc32xx->chip.ops = &lpc32xx_pwm_ops;
|
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lpc32xx->chip.npwm = 2;
|
||||
lpc32xx->chip.npwm = 1;
|
||||
lpc32xx->chip.base = -1;
|
||||
|
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ret = pwmchip_add(&lpc32xx->chip);
|
||||
|
||||
@ -13,10 +13,12 @@
|
||||
* published by the Free Software Foundation.
|
||||
*/
|
||||
|
||||
#include <linux/delay.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/time.h>
|
||||
|
||||
#include "pwm-lpss.h"
|
||||
|
||||
@ -24,11 +26,8 @@
|
||||
#define PWM_ENABLE BIT(31)
|
||||
#define PWM_SW_UPDATE BIT(30)
|
||||
#define PWM_BASE_UNIT_SHIFT 8
|
||||
#define PWM_BASE_UNIT_MASK 0x00ffff00
|
||||
#define PWM_ON_TIME_DIV_MASK 0x000000ff
|
||||
#define PWM_DIVISION_CORRECTION 0x2
|
||||
#define PWM_LIMIT (0x8000 + PWM_DIVISION_CORRECTION)
|
||||
#define NSECS_PER_SEC 1000000000UL
|
||||
|
||||
/* Size of each PWM register space if multiple */
|
||||
#define PWM_SIZE 0x400
|
||||
@ -36,13 +35,14 @@
|
||||
struct pwm_lpss_chip {
|
||||
struct pwm_chip chip;
|
||||
void __iomem *regs;
|
||||
unsigned long clk_rate;
|
||||
const struct pwm_lpss_boardinfo *info;
|
||||
};
|
||||
|
||||
/* BayTrail */
|
||||
const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
|
||||
.clk_rate = 25000000,
|
||||
.npwm = 1,
|
||||
.base_unit_bits = 16,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(pwm_lpss_byt_info);
|
||||
|
||||
@ -50,6 +50,7 @@ EXPORT_SYMBOL_GPL(pwm_lpss_byt_info);
|
||||
const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
|
||||
.clk_rate = 19200000,
|
||||
.npwm = 1,
|
||||
.base_unit_bits = 16,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(pwm_lpss_bsw_info);
|
||||
|
||||
@ -57,6 +58,7 @@ EXPORT_SYMBOL_GPL(pwm_lpss_bsw_info);
|
||||
const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
|
||||
.clk_rate = 19200000,
|
||||
.npwm = 4,
|
||||
.base_unit_bits = 22,
|
||||
};
|
||||
EXPORT_SYMBOL_GPL(pwm_lpss_bxt_info);
|
||||
|
||||
@ -79,28 +81,37 @@ static inline void pwm_lpss_write(const struct pwm_device *pwm, u32 value)
|
||||
writel(value, lpwm->regs + pwm->hwpwm * PWM_SIZE + PWM);
|
||||
}
|
||||
|
||||
static void pwm_lpss_update(struct pwm_device *pwm)
|
||||
{
|
||||
pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_SW_UPDATE);
|
||||
/* Give it some time to propagate */
|
||||
usleep_range(10, 50);
|
||||
}
|
||||
|
||||
static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct pwm_lpss_chip *lpwm = to_lpwm(chip);
|
||||
u8 on_time_div;
|
||||
unsigned long c;
|
||||
unsigned long long base_unit, freq = NSECS_PER_SEC;
|
||||
unsigned long c, base_unit_range;
|
||||
unsigned long long base_unit, freq = NSEC_PER_SEC;
|
||||
u32 ctrl;
|
||||
|
||||
do_div(freq, period_ns);
|
||||
|
||||
/* The equation is: base_unit = ((freq / c) * 65536) + correction */
|
||||
base_unit = freq * 65536;
|
||||
/*
|
||||
* The equation is:
|
||||
* base_unit = ((freq / c) * base_unit_range) + correction
|
||||
*/
|
||||
base_unit_range = BIT(lpwm->info->base_unit_bits);
|
||||
base_unit = freq * base_unit_range;
|
||||
|
||||
c = lpwm->clk_rate;
|
||||
c = lpwm->info->clk_rate;
|
||||
if (!c)
|
||||
return -EINVAL;
|
||||
|
||||
do_div(base_unit, c);
|
||||
base_unit += PWM_DIVISION_CORRECTION;
|
||||
if (base_unit > PWM_LIMIT)
|
||||
return -EINVAL;
|
||||
|
||||
if (duty_ns <= 0)
|
||||
duty_ns = 1;
|
||||
@ -109,13 +120,20 @@ static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
pm_runtime_get_sync(chip->dev);
|
||||
|
||||
ctrl = pwm_lpss_read(pwm);
|
||||
ctrl &= ~(PWM_BASE_UNIT_MASK | PWM_ON_TIME_DIV_MASK);
|
||||
ctrl |= (u16) base_unit << PWM_BASE_UNIT_SHIFT;
|
||||
ctrl &= ~PWM_ON_TIME_DIV_MASK;
|
||||
ctrl &= ~((base_unit_range - 1) << PWM_BASE_UNIT_SHIFT);
|
||||
base_unit &= (base_unit_range - 1);
|
||||
ctrl |= (u32) base_unit << PWM_BASE_UNIT_SHIFT;
|
||||
ctrl |= on_time_div;
|
||||
/* request PWM to update on next cycle */
|
||||
ctrl |= PWM_SW_UPDATE;
|
||||
pwm_lpss_write(pwm, ctrl);
|
||||
|
||||
/*
|
||||
* If the PWM is already enabled we need to notify the hardware
|
||||
* about the change by setting PWM_SW_UPDATE.
|
||||
*/
|
||||
if (pwm_is_enabled(pwm))
|
||||
pwm_lpss_update(pwm);
|
||||
|
||||
pm_runtime_put(chip->dev);
|
||||
|
||||
return 0;
|
||||
@ -124,6 +142,12 @@ static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
|
||||
static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
{
|
||||
pm_runtime_get_sync(chip->dev);
|
||||
|
||||
/*
|
||||
* Hardware must first see PWM_SW_UPDATE before the PWM can be
|
||||
* enabled.
|
||||
*/
|
||||
pwm_lpss_update(pwm);
|
||||
pwm_lpss_write(pwm, pwm_lpss_read(pwm) | PWM_ENABLE);
|
||||
return 0;
|
||||
}
|
||||
@ -135,7 +159,6 @@ static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm)
|
||||
}
|
||||
|
||||
static const struct pwm_ops pwm_lpss_ops = {
|
||||
.free = pwm_lpss_disable,
|
||||
.config = pwm_lpss_config,
|
||||
.enable = pwm_lpss_enable,
|
||||
.disable = pwm_lpss_disable,
|
||||
@ -156,7 +179,7 @@ struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev, struct resource *r,
|
||||
if (IS_ERR(lpwm->regs))
|
||||
return ERR_CAST(lpwm->regs);
|
||||
|
||||
lpwm->clk_rate = info->clk_rate;
|
||||
lpwm->info = info;
|
||||
lpwm->chip.dev = dev;
|
||||
lpwm->chip.ops = &pwm_lpss_ops;
|
||||
lpwm->chip.base = -1;
|
||||
|
||||
@ -21,6 +21,7 @@ struct pwm_lpss_chip;
|
||||
struct pwm_lpss_boardinfo {
|
||||
unsigned long clk_rate;
|
||||
unsigned int npwm;
|
||||
unsigned long base_unit_bits;
|
||||
};
|
||||
|
||||
extern const struct pwm_lpss_boardinfo pwm_lpss_byt_info;
|
||||
|
||||
327
drivers/pwm/pwm-omap-dmtimer.c
Normal file
327
drivers/pwm/pwm-omap-dmtimer.c
Normal file
@ -0,0 +1,327 @@
|
||||
/*
|
||||
* Copyright (c) 2015 Neil Armstrong <narmstrong@baylibre.com>
|
||||
* Copyright (c) 2014 Joachim Eastwood <manabian@gmail.com>
|
||||
* Copyright (c) 2012 NeilBrown <neilb@suse.de>
|
||||
* Heavily based on earlier code which is:
|
||||
* Copyright (c) 2010 Grant Erickson <marathon96@gmail.com>
|
||||
*
|
||||
* Also based on pwm-samsung.c
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or
|
||||
* modify it under the terms of the GNU General Public License
|
||||
* version 2 as published by the Free Software Foundation.
|
||||
*
|
||||
* Description:
|
||||
* This file is the core OMAP support for the generic, Linux
|
||||
* PWM driver / controller, using the OMAP's dual-mode timers.
|
||||
*/
|
||||
|
||||
#include <linux/clk.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/kernel.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/mutex.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_platform.h>
|
||||
#include <linux/platform_data/pwm_omap_dmtimer.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/pm_runtime.h>
|
||||
#include <linux/pwm.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/time.h>
|
||||
|
||||
#define DM_TIMER_LOAD_MIN 0xfffffffe
|
||||
|
||||
struct pwm_omap_dmtimer_chip {
|
||||
struct pwm_chip chip;
|
||||
struct mutex mutex;
|
||||
pwm_omap_dmtimer *dm_timer;
|
||||
struct pwm_omap_dmtimer_pdata *pdata;
|
||||
struct platform_device *dm_timer_pdev;
|
||||
};
|
||||
|
||||
static inline struct pwm_omap_dmtimer_chip *
|
||||
to_pwm_omap_dmtimer_chip(struct pwm_chip *chip)
|
||||
{
|
||||
return container_of(chip, struct pwm_omap_dmtimer_chip, chip);
|
||||
}
|
||||
|
||||
static int pwm_omap_dmtimer_calc_value(unsigned long clk_rate, int ns)
|
||||
{
|
||||
u64 c = (u64)clk_rate * ns;
|
||||
|
||||
do_div(c, NSEC_PER_SEC);
|
||||
|
||||
return DM_TIMER_LOAD_MIN - c;
|
||||
}
|
||||
|
||||
static void pwm_omap_dmtimer_start(struct pwm_omap_dmtimer_chip *omap)
|
||||
{
|
||||
/*
|
||||
* According to OMAP 4 TRM section 22.2.4.10 the counter should be
|
||||
* started at 0xFFFFFFFE when overflow and match is used to ensure
|
||||
* that the PWM line is toggled on the first event.
|
||||
*
|
||||
* Note that omap_dm_timer_enable/disable is for register access and
|
||||
* not the timer counter itself.
|
||||
*/
|
||||
omap->pdata->enable(omap->dm_timer);
|
||||
omap->pdata->write_counter(omap->dm_timer, DM_TIMER_LOAD_MIN);
|
||||
omap->pdata->disable(omap->dm_timer);
|
||||
|
||||
omap->pdata->start(omap->dm_timer);
|
||||
}
|
||||
|
||||
static int pwm_omap_dmtimer_enable(struct pwm_chip *chip,
|
||||
struct pwm_device *pwm)
|
||||
{
|
||||
struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
|
||||
|
||||
mutex_lock(&omap->mutex);
|
||||
pwm_omap_dmtimer_start(omap);
|
||||
mutex_unlock(&omap->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void pwm_omap_dmtimer_disable(struct pwm_chip *chip,
|
||||
struct pwm_device *pwm)
|
||||
{
|
||||
struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
|
||||
|
||||
mutex_lock(&omap->mutex);
|
||||
omap->pdata->stop(omap->dm_timer);
|
||||
mutex_unlock(&omap->mutex);
|
||||
}
|
||||
|
||||
static int pwm_omap_dmtimer_config(struct pwm_chip *chip,
|
||||
struct pwm_device *pwm,
|
||||
int duty_ns, int period_ns)
|
||||
{
|
||||
struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
|
||||
int load_value, match_value;
|
||||
struct clk *fclk;
|
||||
unsigned long clk_rate;
|
||||
bool timer_active;
|
||||
|
||||
dev_dbg(chip->dev, "duty cycle: %d, period %d\n", duty_ns, period_ns);
|
||||
|
||||
mutex_lock(&omap->mutex);
|
||||
if (duty_ns == pwm_get_duty_cycle(pwm) &&
|
||||
period_ns == pwm_get_period(pwm)) {
|
||||
/* No change - don't cause any transients. */
|
||||
mutex_unlock(&omap->mutex);
|
||||
return 0;
|
||||
}
|
||||
|
||||
fclk = omap->pdata->get_fclk(omap->dm_timer);
|
||||
if (!fclk) {
|
||||
dev_err(chip->dev, "invalid pmtimer fclk\n");
|
||||
mutex_unlock(&omap->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
clk_rate = clk_get_rate(fclk);
|
||||
if (!clk_rate) {
|
||||
dev_err(chip->dev, "invalid pmtimer fclk rate\n");
|
||||
mutex_unlock(&omap->mutex);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
dev_dbg(chip->dev, "clk rate: %luHz\n", clk_rate);
|
||||
|
||||
/*
|
||||
* Calculate the appropriate load and match values based on the
|
||||
* specified period and duty cycle. The load value determines the
|
||||
* cycle time and the match value determines the duty cycle.
|
||||
*/
|
||||
load_value = pwm_omap_dmtimer_calc_value(clk_rate, period_ns);
|
||||
match_value = pwm_omap_dmtimer_calc_value(clk_rate,
|
||||
period_ns - duty_ns);
|
||||
|
||||
/*
|
||||
* We MUST stop the associated dual-mode timer before attempting to
|
||||
* write its registers, but calls to omap_dm_timer_start/stop must
|
||||
* be balanced so check if timer is active before calling timer_stop.
|
||||
*/
|
||||
timer_active = pm_runtime_active(&omap->dm_timer_pdev->dev);
|
||||
if (timer_active)
|
||||
omap->pdata->stop(omap->dm_timer);
|
||||
|
||||
omap->pdata->set_load(omap->dm_timer, true, load_value);
|
||||
omap->pdata->set_match(omap->dm_timer, true, match_value);
|
||||
|
||||
dev_dbg(chip->dev, "load value: %#08x (%d), match value: %#08x (%d)\n",
|
||||
load_value, load_value, match_value, match_value);
|
||||
|
||||
omap->pdata->set_pwm(omap->dm_timer,
|
||||
pwm->polarity == PWM_POLARITY_INVERSED,
|
||||
true,
|
||||
PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW_AND_COMPARE);
|
||||
|
||||
/* If config was called while timer was running it must be reenabled. */
|
||||
if (timer_active)
|
||||
pwm_omap_dmtimer_start(omap);
|
||||
|
||||
mutex_unlock(&omap->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pwm_omap_dmtimer_set_polarity(struct pwm_chip *chip,
|
||||
struct pwm_device *pwm,
|
||||
enum pwm_polarity polarity)
|
||||
{
|
||||
struct pwm_omap_dmtimer_chip *omap = to_pwm_omap_dmtimer_chip(chip);
|
||||
|
||||
/*
|
||||
* PWM core will not call set_polarity while PWM is enabled so it's
|
||||
* safe to reconfigure the timer here without stopping it first.
|
||||
*/
|
||||
mutex_lock(&omap->mutex);
|
||||
omap->pdata->set_pwm(omap->dm_timer,
|
||||
polarity == PWM_POLARITY_INVERSED,
|
||||
true,
|
||||
PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW_AND_COMPARE);
|
||||
mutex_unlock(&omap->mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct pwm_ops pwm_omap_dmtimer_ops = {
|
||||
.enable = pwm_omap_dmtimer_enable,
|
||||
.disable = pwm_omap_dmtimer_disable,
|
||||
.config = pwm_omap_dmtimer_config,
|
||||
.set_polarity = pwm_omap_dmtimer_set_polarity,
|
||||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct device_node *timer;
|
||||
struct pwm_omap_dmtimer_chip *omap;
|
||||
struct pwm_omap_dmtimer_pdata *pdata;
|
||||
pwm_omap_dmtimer *dm_timer;
|
||||
u32 prescaler;
|
||||
int status;
|
||||
|
||||
pdata = dev_get_platdata(&pdev->dev);
|
||||
if (!pdata) {
|
||||
dev_err(&pdev->dev, "Missing dmtimer platform data\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (!pdata->request_by_node ||
|
||||
!pdata->free ||
|
||||
!pdata->enable ||
|
||||
!pdata->disable ||
|
||||
!pdata->get_fclk ||
|
||||
!pdata->start ||
|
||||
!pdata->stop ||
|
||||
!pdata->set_load ||
|
||||
!pdata->set_match ||
|
||||
!pdata->set_pwm ||
|
||||
!pdata->set_prescaler ||
|
||||
!pdata->write_counter) {
|
||||
dev_err(&pdev->dev, "Incomplete dmtimer pdata structure\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
timer = of_parse_phandle(np, "ti,timers", 0);
|
||||
if (!timer)
|
||||
return -ENODEV;
|
||||
|
||||
if (!of_get_property(timer, "ti,timer-pwm", NULL)) {
|
||||
dev_err(&pdev->dev, "Missing ti,timer-pwm capability\n");
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
dm_timer = pdata->request_by_node(timer);
|
||||
if (!dm_timer)
|
||||
return -EPROBE_DEFER;
|
||||
|
||||
omap = devm_kzalloc(&pdev->dev, sizeof(*omap), GFP_KERNEL);
|
||||
if (!omap) {
|
||||
pdata->free(dm_timer);
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
omap->pdata = pdata;
|
||||
omap->dm_timer = dm_timer;
|
||||
|
||||
omap->dm_timer_pdev = of_find_device_by_node(timer);
|
||||
if (!omap->dm_timer_pdev) {
|
||||
dev_err(&pdev->dev, "Unable to find timer pdev\n");
|
||||
omap->pdata->free(dm_timer);
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/*
|
||||
* Ensure that the timer is stopped before we allow PWM core to call
|
||||
* pwm_enable.
|
||||
*/
|
||||
if (pm_runtime_active(&omap->dm_timer_pdev->dev))
|
||||
omap->pdata->stop(omap->dm_timer);
|
||||
|
||||
/* setup dmtimer prescaler */
|
||||
if (!of_property_read_u32(pdev->dev.of_node, "ti,prescaler",
|
||||
&prescaler))
|
||||
omap->pdata->set_prescaler(omap->dm_timer, prescaler);
|
||||
|
||||
omap->chip.dev = &pdev->dev;
|
||||
omap->chip.ops = &pwm_omap_dmtimer_ops;
|
||||
omap->chip.base = -1;
|
||||
omap->chip.npwm = 1;
|
||||
omap->chip.of_xlate = of_pwm_xlate_with_flags;
|
||||
omap->chip.of_pwm_n_cells = 3;
|
||||
|
||||
mutex_init(&omap->mutex);
|
||||
|
||||
status = pwmchip_add(&omap->chip);
|
||||
if (status < 0) {
|
||||
dev_err(&pdev->dev, "failed to register PWM\n");
|
||||
omap->pdata->free(omap->dm_timer);
|
||||
return status;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, omap);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int pwm_omap_dmtimer_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct pwm_omap_dmtimer_chip *omap = platform_get_drvdata(pdev);
|
||||
|
||||
if (pm_runtime_active(&omap->dm_timer_pdev->dev))
|
||||
omap->pdata->stop(omap->dm_timer);
|
||||
|
||||
omap->pdata->free(omap->dm_timer);
|
||||
|
||||
mutex_destroy(&omap->mutex);
|
||||
|
||||
return pwmchip_remove(&omap->chip);
|
||||
}
|
||||
|
||||
static const struct of_device_id pwm_omap_dmtimer_of_match[] = {
|
||||
{.compatible = "ti,omap-dmtimer-pwm"},
|
||||
{}
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, pwm_omap_dmtimer_of_match);
|
||||
|
||||
static struct platform_driver pwm_omap_dmtimer_driver = {
|
||||
.driver = {
|
||||
.name = "omap-dmtimer-pwm",
|
||||
.of_match_table = of_match_ptr(pwm_omap_dmtimer_of_match),
|
||||
},
|
||||
.probe = pwm_omap_dmtimer_probe,
|
||||
.remove = pwm_omap_dmtimer_remove,
|
||||
};
|
||||
module_platform_driver(pwm_omap_dmtimer_driver);
|
||||
|
||||
MODULE_AUTHOR("Grant Erickson <marathon96@gmail.com>");
|
||||
MODULE_AUTHOR("NeilBrown <neilb@suse.de>");
|
||||
MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_DESCRIPTION("OMAP PWM Driver using Dual-mode Timers");
|
||||
@ -81,7 +81,7 @@ static int rcar_pwm_get_clock_division(struct rcar_pwm_chip *rp, int period_ns)
|
||||
max = (unsigned long long)NSEC_PER_SEC * RCAR_PWM_MAX_CYCLE *
|
||||
(1 << div);
|
||||
do_div(max, clk_rate);
|
||||
if (period_ns < max)
|
||||
if (period_ns <= max)
|
||||
break;
|
||||
}
|
||||
|
||||
|
||||
69
include/linux/platform_data/pwm_omap_dmtimer.h
Normal file
69
include/linux/platform_data/pwm_omap_dmtimer.h
Normal file
@ -0,0 +1,69 @@
|
||||
/*
|
||||
* include/linux/platform_data/pwm_omap_dmtimer.h
|
||||
*
|
||||
* OMAP Dual-Mode Timer PWM platform data
|
||||
*
|
||||
* Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
|
||||
* Tarun Kanti DebBarma <tarun.kanti@ti.com>
|
||||
* Thara Gopinath <thara@ti.com>
|
||||
*
|
||||
* Platform device conversion and hwmod support.
|
||||
*
|
||||
* Copyright (C) 2005 Nokia Corporation
|
||||
* Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
|
||||
* PWM and clock framework support by Timo Teras.
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version.
|
||||
*
|
||||
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
|
||||
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
|
||||
* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
||||
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
||||
* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
||||
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*/
|
||||
|
||||
#ifndef __PWM_OMAP_DMTIMER_PDATA_H
|
||||
#define __PWM_OMAP_DMTIMER_PDATA_H
|
||||
|
||||
/* trigger types */
|
||||
#define PWM_OMAP_DMTIMER_TRIGGER_NONE 0x00
|
||||
#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW 0x01
|
||||
#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW_AND_COMPARE 0x02
|
||||
|
||||
struct omap_dm_timer;
|
||||
typedef struct omap_dm_timer pwm_omap_dmtimer;
|
||||
|
||||
struct pwm_omap_dmtimer_pdata {
|
||||
pwm_omap_dmtimer *(*request_by_node)(struct device_node *np);
|
||||
int (*free)(pwm_omap_dmtimer *timer);
|
||||
|
||||
void (*enable)(pwm_omap_dmtimer *timer);
|
||||
void (*disable)(pwm_omap_dmtimer *timer);
|
||||
|
||||
struct clk *(*get_fclk)(pwm_omap_dmtimer *timer);
|
||||
|
||||
int (*start)(pwm_omap_dmtimer *timer);
|
||||
int (*stop)(pwm_omap_dmtimer *timer);
|
||||
|
||||
int (*set_load)(pwm_omap_dmtimer *timer, int autoreload,
|
||||
unsigned int value);
|
||||
int (*set_match)(pwm_omap_dmtimer *timer, int enable,
|
||||
unsigned int match);
|
||||
int (*set_pwm)(pwm_omap_dmtimer *timer, int def_on,
|
||||
int toggle, int trigger);
|
||||
int (*set_prescaler)(pwm_omap_dmtimer *timer, int prescaler);
|
||||
|
||||
int (*write_counter)(pwm_omap_dmtimer *timer, unsigned int value);
|
||||
};
|
||||
|
||||
#endif /* __PWM_OMAP_DMTIMER_PDATA_H */
|
||||
Loading…
Reference in New Issue
Block a user