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113 lines
3.1 KiB
113 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Intel Low Power Subsystem PWM controller driver |
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* |
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* Copyright (C) 2014, Intel Corporation |
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* |
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* Derived from the original pwm-lpss.c |
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*/ |
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#include <linux/acpi.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/pm_runtime.h> |
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#include "pwm-lpss.h" |
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/* BayTrail */ |
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static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = { |
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.clk_rate = 25000000, |
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.npwm = 1, |
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.base_unit_bits = 16, |
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}; |
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/* Braswell */ |
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static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = { |
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.clk_rate = 19200000, |
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.npwm = 1, |
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.base_unit_bits = 16, |
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.other_devices_aml_touches_pwm_regs = true, |
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}; |
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/* Broxton */ |
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static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = { |
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.clk_rate = 19200000, |
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.npwm = 4, |
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.base_unit_bits = 22, |
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.bypass = true, |
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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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const struct pwm_lpss_boardinfo *info; |
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const struct acpi_device_id *id; |
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struct pwm_lpss_chip *lpwm; |
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struct resource *r; |
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id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev); |
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if (!id) |
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return -ENODEV; |
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info = (const struct pwm_lpss_boardinfo *)id->driver_data; |
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r = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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lpwm = pwm_lpss_probe(&pdev->dev, r, info); |
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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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/* |
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* On Cherry Trail devices the GFX0._PS0 AML checks if the controller |
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* is on and if it is not on it turns it on and restores what it |
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* believes is the correct state to the PWM controller. |
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* Because of this we must disallow direct-complete, which keeps the |
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* controller (runtime)suspended on resume, to avoid 2 issues: |
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* 1. The controller getting turned on without the linux-pm code |
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* knowing about this. On devices where the controller is unused |
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* this causes it to stay on during the next suspend causing high |
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* battery drain (because S0i3 is not reached) |
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* 2. The state restoring code unexpectedly messing with the controller |
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* |
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* Leaving the controller runtime-suspended (skipping runtime-resume + |
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* normal-suspend) during suspend is fine. |
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*/ |
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if (info->other_devices_aml_touches_pwm_regs) |
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dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE| |
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DPM_FLAG_SMART_SUSPEND); |
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pm_runtime_set_active(&pdev->dev); |
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pm_runtime_enable(&pdev->dev); |
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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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pm_runtime_disable(&pdev->dev); |
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return 0; |
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} |
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static const struct acpi_device_id pwm_lpss_acpi_match[] = { |
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{ "80860F09", (unsigned long)&pwm_lpss_byt_info }, |
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{ "80862288", (unsigned long)&pwm_lpss_bsw_info }, |
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{ "80862289", (unsigned long)&pwm_lpss_bsw_info }, |
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{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info }, |
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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_platform, |
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.remove = pwm_lpss_remove_platform, |
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}; |
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module_platform_driver(pwm_lpss_driver_platform); |
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MODULE_DESCRIPTION("PWM platform driver for Intel LPSS"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:pwm-lpss");
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