diff options
Diffstat (limited to 'drivers/pwm/pwm-lpss.c')
| -rw-r--r-- | drivers/pwm/pwm-lpss.c | 169 |
1 files changed, 128 insertions, 41 deletions
diff --git a/drivers/pwm/pwm-lpss.c b/drivers/pwm/pwm-lpss.c index 449e372050a..4df994f72d9 100644 --- a/drivers/pwm/pwm-lpss.c +++ b/drivers/pwm/pwm-lpss.c @@ -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 @@ -13,12 +14,14 @@ */ #include <linux/acpi.h> -#include <linux/clk.h> #include <linux/device.h> #include <linux/kernel.h> #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) @@ -33,7 +36,16 @@ 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 +67,7 @@ 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; @@ -83,11 +95,6 @@ static int pwm_lpss_enable(struct pwm_chip *chip, struct pwm_device *pwm) { struct pwm_lpss_chip *lpwm = to_lpwm(chip); u32 ctrl; - int ret; - - ret = clk_prepare_enable(lpwm->clk); - if (ret) - return ret; ctrl = readl(lpwm->regs + PWM); writel(ctrl | PWM_ENABLE, lpwm->regs + PWM); @@ -102,8 +109,6 @@ static void pwm_lpss_disable(struct pwm_chip *chip, struct pwm_device *pwm) ctrl = readl(lpwm->regs + PWM); writel(ctrl & ~PWM_ENABLE, lpwm->regs + PWM); - - clk_disable_unprepare(lpwm->clk); } static const struct pwm_ops pwm_lpss_ops = { @@ -113,52 +118,38 @@ 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, + const 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; - - r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + return ERR_PTR(-ENOMEM); - 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); - - 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); - } + return ERR_CAST(lpwm->regs); - lpwm->chip.dev = &pdev->dev; + lpwm->clk_rate = info->clk_rate; + 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 +158,111 @@ 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) +{ + const struct pwm_lpss_boardinfo *info; + const struct acpi_device_id *id; + struct pwm_lpss_chip *lpwm; + struct resource *r; + + id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); + if (!id) + return -ENODEV; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + + info = (struct pwm_lpss_boardinfo *)id->driver_data; + lpwm = pwm_lpss_probe(&pdev->dev, r, info); + 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", (unsigned long)&byt_info }, + { }, +}; +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>"); |