mirror of
https://github.com/AetherDroid/android_kernel_samsung_on5xelte.git
synced 2025-09-08 01:08:03 -04:00
153 lines
3.6 KiB
C
153 lines
3.6 KiB
C
/*
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* Copyright (c) 2016 Samsung Electronics Co., Ltd.
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* http://www.samsung.com/
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*
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* EXYNOS - USI(Universal Serial Interface) driver.
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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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* published by the Free Software Foundation.
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*/
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#include <linux/err.h>
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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/* USI mode */
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#define USI_HSI2C0_SINGLE_MODE 0x1
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#define USI_HSI2C1_SINGLE_MODE 0x2
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#define USI_HSI2C0_HSI2C1_DUAL_MODE 0x3
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#define USI_SPI_SINGLE_MODE 0x4
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#define USI_UART_SINGLE_MODE 0x8
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#define USI_UART_HSI2C1_DUAL_MODE 0xA
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struct usi_mode {
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int val;
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const char *name;
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};
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struct usi_data {
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void __iomem *base;
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u32 mode;
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};
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static const struct usi_mode usi_modes[] = {
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{ .val = USI_HSI2C0_HSI2C1_DUAL_MODE , .name = "hsi2c0_hsi2c1" },
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{ .val = USI_UART_HSI2C1_DUAL_MODE , .name = "uart_hsi2c1" },
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{ .val = USI_HSI2C0_SINGLE_MODE , .name = "hsi2c0" },
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{ .val = USI_HSI2C1_SINGLE_MODE , .name = "hsi2c1" },
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{ .val = USI_SPI_SINGLE_MODE , .name = "spi" },
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{ .val = USI_UART_SINGLE_MODE , .name = "uart" },
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};
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static int get_usi_mode(const char* mode_name)
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{
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int i;
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for (i = 0; i < sizeof(usi_modes)/sizeof(struct usi_mode); i++) {
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if (!strncmp(mode_name, usi_modes[i].name,
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strlen(usi_modes[i].name)))
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return usi_modes[i].val;
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}
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return -1;
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}
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static int usi_probe(struct platform_device *pdev)
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{
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struct device_node *node = pdev->dev.of_node;
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struct resource *res;
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const char* mode_name;
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struct usi_data *data;
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data = devm_kzalloc(&pdev->dev, sizeof(struct usi_data), GFP_KERNEL);
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if (!data) {
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dev_err(&pdev->dev, "no memory to save usi_data\n");
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return -ENOMEM;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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data->base = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(data->base))
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return PTR_ERR(data->base);
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if (of_property_read_string(node, "usi_mode", &mode_name) < 0) {
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dev_err(&pdev->dev, "missing usi mode configuration\n");
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return -EINVAL;
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}
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data->mode = get_usi_mode(mode_name);
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if (data->mode < 0) {
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dev_err(&pdev->dev, "wrong usi mode: %s\n", mode_name);
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return -EINVAL;
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}
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writel(data->mode, data->base);
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dev_info(&pdev->dev, "usi_probe() mode:%d\n", data->mode);
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platform_set_drvdata(pdev, data);
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return 0;
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}
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static const struct of_device_id usi_dt_match[] = {
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{ .compatible = "samsung,exynos-usi", },
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{ },
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};
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MODULE_DEVICE_TABLE(of, usi_dt_match);
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static int usi_resume_noirq(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct usi_data *data = platform_get_drvdata(pdev);
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int ret;
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if (data->mode && data->base) {
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writel(data->mode, data->base);
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dev_info(&pdev->dev, "%s mode:%d\n", __func__, data->mode);
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ret = 0;
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} else {
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dev_err(&pdev->dev, "%s wrong usi data\n", __func__);
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ret = -EINVAL;
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}
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return ret;
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}
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static const struct dev_pm_ops usi_pm = {
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.resume_noirq = usi_resume_noirq,
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};
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static struct platform_driver usi_driver = {
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.driver = {
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.name = "usi",
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.owner = THIS_MODULE,
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.pm = &usi_pm,
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.of_match_table = usi_dt_match,
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},
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.probe = usi_probe,
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};
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static int __init usi_init(void)
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{
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int ret = platform_driver_register(&usi_driver);
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if (ret)
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pr_err("usi driver registrer failed\n");
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return ret;
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}
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arch_initcall(usi_init);
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static void __exit usi_exit(void)
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{
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platform_driver_unregister(&usi_driver);
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}
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module_exit(usi_exit);
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MODULE_AUTHOR("Jung Ick Guack <ji.guack@samsung.com>");
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MODULE_DESCRIPTION("SAMSUNG USI driver");
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MODULE_LICENSE("GPL");
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