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pwm: lpss: Add support for PCI devices

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Not all systems enumerate the PWM devices via ACPI. They can also be
exposed via the PCI interface.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Alan Cox 2014-04-18 19:17:40 +08:00 committed by Thierry Reding
parent b9f87404dd
commit 093e00bb3f
1 changed files with 129 additions and 30 deletions
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159
drivers/pwm/pwm-lpss.c
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@ -6,6 +6,7 @@
* Author: Chew Kean Ho <kean.ho.chew@intel.com>
* Author: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
* Author: Chew Chiau Ee <chiau.ee.chew@intel.com>
* Author: Alan Cox <alan@linux.intel.com>
*
* 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
@ -19,6 +20,9 @@
#include <linux/module.h>
#include <linux/pwm.h>
#include <linux/platform_device.h>
#include <linux/pci.h>
static int pci_drv, plat_drv; /* So we know which drivers registered */
#define PWM 0x00000000
#define PWM_ENABLE BIT(31)
@ -34,6 +38,16 @@ struct pwm_lpss_chip {
struct pwm_chip chip;
void __iomem *regs;
struct clk *clk;
unsigned long clk_rate;
};
struct pwm_lpss_boardinfo {
unsigned long clk_rate;
};
/* BayTrail */
static const struct pwm_lpss_boardinfo byt_info = {
25000000
};
static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
@ -55,7 +69,7 @@ static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
/* The equation is: base_unit = ((freq / c) * 65536) + correction */
base_unit = freq * 65536;
c = clk_get_rate(lpwm->clk);
c = lpwm->clk_rate;
if (!c)
return -EINVAL;
@ -113,52 +127,48 @@ static const struct pwm_ops pwm_lpss_ops = {
.owner = THIS_MODULE,
};
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
{ "80860F09", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
static int pwm_lpss_probe(struct platform_device *pdev)
static struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev,
struct resource *r,
struct pwm_lpss_boardinfo *info)
{
struct pwm_lpss_chip *lpwm;
struct resource *r;
int ret;
lpwm = devm_kzalloc(&pdev->dev, sizeof(*lpwm), GFP_KERNEL);
lpwm = devm_kzalloc(dev, sizeof(*lpwm), GFP_KERNEL);
if (!lpwm)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
lpwm->regs = devm_ioremap_resource(&pdev->dev, r);
lpwm->regs = devm_ioremap_resource(dev, r);
if (IS_ERR(lpwm->regs))
return PTR_ERR(lpwm->regs);
return lpwm->regs;
lpwm->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(lpwm->clk)) {
dev_err(&pdev->dev, "failed to get PWM clock\n");
return PTR_ERR(lpwm->clk);
if (info) {
lpwm->clk_rate = info->clk_rate;
} else {
lpwm->clk = devm_clk_get(dev, NULL);
if (IS_ERR(lpwm->clk)) {
dev_err(dev, "failed to get PWM clock\n");
return ERR_CAST(lpwm->clk);
}
lpwm->clk_rate = clk_get_rate(lpwm->clk);
}
lpwm->chip.dev = &pdev->dev;
lpwm->chip.dev = dev;
lpwm->chip.ops = &pwm_lpss_ops;
lpwm->chip.base = -1;
lpwm->chip.npwm = 1;
ret = pwmchip_add(&lpwm->chip);
if (ret) {
dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
return ret;
dev_err(dev, "failed to add PWM chip: %d\n", ret);
return ERR_PTR(ret);
}
platform_set_drvdata(pdev, lpwm);
return 0;
return lpwm;
}
static int pwm_lpss_remove(struct platform_device *pdev)
static int pwm_lpss_remove(struct pwm_lpss_chip *lpwm)
{
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
u32 ctrl;
ctrl = readl(lpwm->regs + PWM);
@ -167,15 +177,104 @@ static int pwm_lpss_remove(struct platform_device *pdev)
return pwmchip_remove(&lpwm->chip);
}
static struct platform_driver pwm_lpss_driver = {
static int pwm_lpss_probe_pci(struct pci_dev *pdev,
const struct pci_device_id *id)
{
const struct pwm_lpss_boardinfo *info;
struct pwm_lpss_chip *lpwm;
int err;
err = pci_enable_device(pdev);
if (err < 0)
return err;
info = (struct pwm_lpss_boardinfo *)id->driver_data;
lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
if (IS_ERR(lpwm))
return PTR_ERR(lpwm);
pci_set_drvdata(pdev, lpwm);
return 0;
}
static void pwm_lpss_remove_pci(struct pci_dev *pdev)
{
struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
pwm_lpss_remove(lpwm);
pci_disable_device(pdev);
}
static struct pci_device_id pwm_lpss_pci_ids[] = {
{ PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&byt_info},
{ PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&byt_info},
{ },
};
MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
static struct pci_driver pwm_lpss_driver_pci = {
.name = "pwm-lpss",
.id_table = pwm_lpss_pci_ids,
.probe = pwm_lpss_probe_pci,
.remove = pwm_lpss_remove_pci,
};
static int pwm_lpss_probe_platform(struct platform_device *pdev)
{
struct pwm_lpss_chip *lpwm;
struct resource *r;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
lpwm = pwm_lpss_probe(&pdev->dev, r, NULL);
if (IS_ERR(lpwm))
return PTR_ERR(lpwm);
platform_set_drvdata(pdev, lpwm);
return 0;
}
static int pwm_lpss_remove_platform(struct platform_device *pdev)
{
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
return pwm_lpss_remove(lpwm);
}
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
{ "80860F09", 0 },
{ },
};
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
static struct platform_driver pwm_lpss_driver_platform = {
.driver = {
.name = "pwm-lpss",
.acpi_match_table = pwm_lpss_acpi_match,
},
.probe = pwm_lpss_probe,
.remove = pwm_lpss_remove,
.probe = pwm_lpss_probe_platform,
.remove = pwm_lpss_remove_platform,
};
module_platform_driver(pwm_lpss_driver);
static int __init pwm_init(void)
{
pci_drv = pci_register_driver(&pwm_lpss_driver_pci);
plat_drv = platform_driver_register(&pwm_lpss_driver_platform);
if (pci_drv && plat_drv)
return pci_drv;
return 0;
}
module_init(pwm_init);
static void __exit pwm_exit(void)
{
if (!pci_drv)
pci_unregister_driver(&pwm_lpss_driver_pci);
if (!plat_drv)
platform_driver_unregister(&pwm_lpss_driver_platform);
}
module_exit(pwm_exit);
MODULE_DESCRIPTION("PWM driver for Intel LPSS");
MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");