Commit ebf2c89e authored by Raag Jadav's avatar Raag Jadav Committed by Uwe Kleine-König
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pwm: dwc: Add 16 channel support for Intel Elkhart Lake 



Intel Elkhart Lake PSE includes two instances of PWM as a single PCI
function with 8 channels each. Add support for the remaining channels.

Signed-off-by: default avatarRaag Jadav <raag.jadav@intel.com>
Tested-by: default avatarJarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: default avatarLakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Link: https://lore.kernel.org/r/20240219033835.11369-4-raag.jadav@intel.com


Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
parent 144a0008

drivers/pwm/pwm-dwc.c

+29 −9
Original line number Diff line number Diff line
@@ -25,17 +25,32 @@ 


#include "pwm-dwc.h"



static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)

/* Elkhart Lake */

static const struct dwc_pwm_info ehl_pwm_info = {

	.nr = 2,

	.size = 0x1000,

};



static int dwc_pwm_init_one(struct device *dev, void __iomem *base, unsigned int offset)

{

	struct device *dev = &pci->dev;

	struct pwm_chip *chip;

	struct dwc_pwm *dwc;

	int ret;



	chip = dwc_pwm_alloc(dev);

	if (IS_ERR(chip))

		return PTR_ERR(chip);



	dwc = to_dwc_pwm(chip);

	dwc->base = base + offset;



	return devm_pwmchip_add(dev, chip);

}



static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id)

{

	const struct dwc_pwm_info *info;

	struct device *dev = &pci->dev;

	int i, ret;



	ret = pcim_enable_device(pci);

	if (ret) {
@@ -51,12 +66,17 @@ static int dwc_pwm_probe(struct pci_dev *pci, const struct pci_device_id *id) 
		return ret;

	}



	/* No need to check for failure, pcim_iomap_regions() does it for us. */

	dwc->base = pcim_iomap_table(pci)[0];

	info = (const struct dwc_pwm_info *)id->driver_data;



	ret = devm_pwmchip_add(dev, chip);

	for (i = 0; i < info->nr; i++) {

		/*

		 * No need to check for pcim_iomap_table() failure,

		 * pcim_iomap_regions() already does it for us.

		 */

		ret = dwc_pwm_init_one(dev, pcim_iomap_table(pci)[0], i * info->size);

		if (ret)

			return ret;

	}



	pm_runtime_put(dev);

	pm_runtime_allow(dev);
@@ -108,7 +128,7 @@ static int dwc_pwm_resume(struct device *dev) 
static DEFINE_SIMPLE_DEV_PM_OPS(dwc_pwm_pm_ops, dwc_pwm_suspend, dwc_pwm_resume);



static const struct pci_device_id dwc_pwm_id_table[] = {

	{ PCI_VDEVICE(INTEL, 0x4bb7) }, /* Elkhart Lake */

	{ PCI_VDEVICE(INTEL, 0x4bb7), (kernel_ulong_t)&ehl_pwm_info },

	{  }	/* Terminating Entry */

};

MODULE_DEVICE_TABLE(pci, dwc_pwm_id_table);

drivers/pwm/pwm-dwc.h

+5 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ MODULE_IMPORT_NS(dwc_pwm); 
#define DWC_TIM_CTRL_INT_MASK	BIT(2)

#define DWC_TIM_CTRL_PWM	BIT(3)



struct dwc_pwm_info {

	unsigned int nr;

	unsigned int size;

};



struct dwc_pwm_ctx {

	u32 cnt;

	u32 cnt2;