Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 | /* * TI PWM Subsystem driver * * Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com/ * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/io.h> #include <linux/err.h> #include <linux/pm_runtime.h> #include <linux/of_device.h> #include "pwm-tipwmss.h" #define PWMSS_CLKCONFIG 0x8 /* Clock gating reg */ #define PWMSS_CLKSTATUS 0xc /* Clock gating status reg */ struct pwmss_info { void __iomem *mmio_base; struct mutex pwmss_lock; u16 pwmss_clkconfig; }; u16 pwmss_submodule_state_change(struct device *dev, int set) { struct pwmss_info *info = dev_get_drvdata(dev); u16 val; mutex_lock(&info->pwmss_lock); val = readw(info->mmio_base + PWMSS_CLKCONFIG); val |= set; writew(val , info->mmio_base + PWMSS_CLKCONFIG); mutex_unlock(&info->pwmss_lock); return readw(info->mmio_base + PWMSS_CLKSTATUS); } EXPORT_SYMBOL(pwmss_submodule_state_change); static const struct of_device_id pwmss_of_match[] = { { .compatible = "ti,am33xx-pwmss" }, {}, }; MODULE_DEVICE_TABLE(of, pwmss_of_match); static int pwmss_probe(struct platform_device *pdev) { int ret; struct resource *r; struct pwmss_info *info; struct device_node *node = pdev->dev.of_node; info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); if (!info) return -ENOMEM; mutex_init(&info->pwmss_lock); r = platform_get_resource(pdev, IORESOURCE_MEM, 0); info->mmio_base = devm_ioremap_resource(&pdev->dev, r); if (IS_ERR(info->mmio_base)) return PTR_ERR(info->mmio_base); pm_runtime_enable(&pdev->dev); pm_runtime_get_sync(&pdev->dev); platform_set_drvdata(pdev, info); /* Populate all the child nodes here... */ ret = of_platform_populate(node, NULL, NULL, &pdev->dev); if (ret) dev_err(&pdev->dev, "no child node found\n"); return ret; } static int pwmss_remove(struct platform_device *pdev) { struct pwmss_info *info = platform_get_drvdata(pdev); pm_runtime_put_sync(&pdev->dev); pm_runtime_disable(&pdev->dev); mutex_destroy(&info->pwmss_lock); return 0; } #ifdef CONFIG_PM_SLEEP static int pwmss_suspend(struct device *dev) { struct pwmss_info *info = dev_get_drvdata(dev); info->pwmss_clkconfig = readw(info->mmio_base + PWMSS_CLKCONFIG); pm_runtime_put_sync(dev); return 0; } static int pwmss_resume(struct device *dev) { struct pwmss_info *info = dev_get_drvdata(dev); pm_runtime_get_sync(dev); writew(info->pwmss_clkconfig, info->mmio_base + PWMSS_CLKCONFIG); return 0; } #endif static SIMPLE_DEV_PM_OPS(pwmss_pm_ops, pwmss_suspend, pwmss_resume); static struct platform_driver pwmss_driver = { .driver = { .name = "pwmss", .pm = &pwmss_pm_ops, .of_match_table = pwmss_of_match, }, .probe = pwmss_probe, .remove = pwmss_remove, }; module_platform_driver(pwmss_driver); MODULE_DESCRIPTION("PWM Subsystem driver"); MODULE_AUTHOR("Texas Instruments"); MODULE_LICENSE("GPL"); |