pwm: lpss: Add support for PCI devices
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>hifive-unleashed-5.1
Alan Cox
Thierry Reding
parent
b9f87404dd
commit
093e00bb3f
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@ -6,6 +6,7 @@
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* Author: Chew Kean Ho <kean.ho.chew@intel.com>
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* Author: Chang Rebecca Swee Fun <rebecca.swee.fun.chang@intel.com>
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* Author: Chew Chiau Ee <chiau.ee.chew@intel.com>
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* Author: Alan Cox <alan@linux.intel.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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@ -19,6 +20,9 @@
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#include <linux/module.h>
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#include <linux/pwm.h>
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#include <linux/platform_device.h>
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#include <linux/pci.h>
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static int pci_drv, plat_drv; /* So we know which drivers registered */
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#define PWM 0x00000000
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#define PWM_ENABLE BIT(31)
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@ -34,6 +38,16 @@ struct pwm_lpss_chip {
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struct pwm_chip chip;
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void __iomem *regs;
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struct clk *clk;
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unsigned long clk_rate;
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};
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struct pwm_lpss_boardinfo {
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unsigned long clk_rate;
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};
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/* BayTrail */
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static const struct pwm_lpss_boardinfo byt_info = {
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25000000
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};
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static inline struct pwm_lpss_chip *to_lpwm(struct pwm_chip *chip)
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@ -55,7 +69,7 @@ static int pwm_lpss_config(struct pwm_chip *chip, struct pwm_device *pwm,
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/* The equation is: base_unit = ((freq / c) * 65536) + correction */
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base_unit = freq * 65536;
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c = clk_get_rate(lpwm->clk);
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c = lpwm->clk_rate;
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if (!c)
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return -EINVAL;
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@ -113,52 +127,48 @@ static const struct pwm_ops pwm_lpss_ops = {
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.owner = THIS_MODULE,
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};
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static const struct acpi_device_id pwm_lpss_acpi_match[] = {
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{ "80860F09", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
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static int pwm_lpss_probe(struct platform_device *pdev)
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static struct pwm_lpss_chip *pwm_lpss_probe(struct device *dev,
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struct resource *r,
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struct pwm_lpss_boardinfo *info)
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{
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struct pwm_lpss_chip *lpwm;
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struct resource *r;
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int ret;
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lpwm = devm_kzalloc(&pdev->dev, sizeof(*lpwm), GFP_KERNEL);
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lpwm = devm_kzalloc(dev, sizeof(*lpwm), GFP_KERNEL);
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if (!lpwm)
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return -ENOMEM;
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return ERR_PTR(-ENOMEM);
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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lpwm->regs = devm_ioremap_resource(&pdev->dev, r);
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lpwm->regs = devm_ioremap_resource(dev, r);
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if (IS_ERR(lpwm->regs))
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return PTR_ERR(lpwm->regs);
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return lpwm->regs;
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lpwm->clk = devm_clk_get(&pdev->dev, NULL);
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if (IS_ERR(lpwm->clk)) {
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dev_err(&pdev->dev, "failed to get PWM clock\n");
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return PTR_ERR(lpwm->clk);
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if (info) {
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lpwm->clk_rate = info->clk_rate;
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} else {
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lpwm->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(lpwm->clk)) {
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dev_err(dev, "failed to get PWM clock\n");
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return ERR_CAST(lpwm->clk);
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}
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lpwm->clk_rate = clk_get_rate(lpwm->clk);
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}
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lpwm->chip.dev = &pdev->dev;
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lpwm->chip.dev = dev;
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lpwm->chip.ops = &pwm_lpss_ops;
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lpwm->chip.base = -1;
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lpwm->chip.npwm = 1;
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ret = pwmchip_add(&lpwm->chip);
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if (ret) {
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dev_err(&pdev->dev, "failed to add PWM chip: %d\n", ret);
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return ret;
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dev_err(dev, "failed to add PWM chip: %d\n", ret);
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return ERR_PTR(ret);
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}
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platform_set_drvdata(pdev, lpwm);
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return 0;
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return lpwm;
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}
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static int pwm_lpss_remove(struct platform_device *pdev)
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static int pwm_lpss_remove(struct pwm_lpss_chip *lpwm)
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{
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struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
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u32 ctrl;
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ctrl = readl(lpwm->regs + PWM);
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@ -167,15 +177,104 @@ static int pwm_lpss_remove(struct platform_device *pdev)
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return pwmchip_remove(&lpwm->chip);
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}
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static struct platform_driver pwm_lpss_driver = {
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static int pwm_lpss_probe_pci(struct pci_dev *pdev,
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const struct pci_device_id *id)
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{
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const struct pwm_lpss_boardinfo *info;
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struct pwm_lpss_chip *lpwm;
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int err;
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err = pci_enable_device(pdev);
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if (err < 0)
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return err;
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info = (struct pwm_lpss_boardinfo *)id->driver_data;
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lpwm = pwm_lpss_probe(&pdev->dev, &pdev->resource[0], info);
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if (IS_ERR(lpwm))
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return PTR_ERR(lpwm);
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pci_set_drvdata(pdev, lpwm);
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return 0;
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}
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static void pwm_lpss_remove_pci(struct pci_dev *pdev)
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{
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struct pwm_lpss_chip *lpwm = pci_get_drvdata(pdev);
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pwm_lpss_remove(lpwm);
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pci_disable_device(pdev);
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}
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static struct pci_device_id pwm_lpss_pci_ids[] = {
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{ PCI_VDEVICE(INTEL, 0x0f08), (unsigned long)&byt_info},
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{ PCI_VDEVICE(INTEL, 0x0f09), (unsigned long)&byt_info},
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{ },
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};
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MODULE_DEVICE_TABLE(pci, pwm_lpss_pci_ids);
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static struct pci_driver pwm_lpss_driver_pci = {
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.name = "pwm-lpss",
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.id_table = pwm_lpss_pci_ids,
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.probe = pwm_lpss_probe_pci,
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.remove = pwm_lpss_remove_pci,
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};
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static int pwm_lpss_probe_platform(struct platform_device *pdev)
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{
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struct pwm_lpss_chip *lpwm;
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struct resource *r;
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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lpwm = pwm_lpss_probe(&pdev->dev, r, NULL);
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if (IS_ERR(lpwm))
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return PTR_ERR(lpwm);
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platform_set_drvdata(pdev, lpwm);
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return 0;
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}
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static int pwm_lpss_remove_platform(struct platform_device *pdev)
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{
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struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
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return pwm_lpss_remove(lpwm);
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}
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static const struct acpi_device_id pwm_lpss_acpi_match[] = {
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{ "80860F09", 0 },
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{ },
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};
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MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
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static struct platform_driver pwm_lpss_driver_platform = {
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.driver = {
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.name = "pwm-lpss",
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.acpi_match_table = pwm_lpss_acpi_match,
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},
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.probe = pwm_lpss_probe,
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.remove = pwm_lpss_remove,
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.probe = pwm_lpss_probe_platform,
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.remove = pwm_lpss_remove_platform,
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};
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module_platform_driver(pwm_lpss_driver);
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static int __init pwm_init(void)
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{
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pci_drv = pci_register_driver(&pwm_lpss_driver_pci);
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plat_drv = platform_driver_register(&pwm_lpss_driver_platform);
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if (pci_drv && plat_drv)
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return pci_drv;
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return 0;
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}
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module_init(pwm_init);
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static void __exit pwm_exit(void)
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{
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if (!pci_drv)
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pci_unregister_driver(&pwm_lpss_driver_pci);
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if (!plat_drv)
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platform_driver_unregister(&pwm_lpss_driver_platform);
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}
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module_exit(pwm_exit);
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MODULE_DESCRIPTION("PWM driver for Intel LPSS");
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MODULE_AUTHOR("Mika Westerberg <mika.westerberg@linux.intel.com>");
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