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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: Raag Jadav <raag.jadav@intel.com>
Tested-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Tested-by: Lakshmi Sowjanya D <lakshmi.sowjanya.d@intel.com>
Link: https://lore.kernel.org/r/20240219033835.11369-4-raag.jadav@intel.com
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
This commit is contained in:
Raag Jadav 2024-02-19 09:08:34 +05:30 committed by Uwe Kleine-König
parent 144a0008b3
commit ebf2c89eb9
2 changed files with 34 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
drivers/pwm/pwm-dwc.c
View File

@ -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);
if (ret)
return ret;
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);

5
drivers/pwm/pwm-dwc.h
View File

@ -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;