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Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* omap-ocp2scp.c - transform ocp interface protocol to scp protocol
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*
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* Copyright (C) 2012 Texas Instruments Incorporated - http://www.ti.com
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* Author: Kishon Vijay Abraham I <kishon@ti.com>
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*/
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#include <linux/io.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/err.h>
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#include <linux/pm_runtime.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#define OCP2SCP_TIMING 0x18
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#define SYNC2_MASK 0xf
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static int ocp2scp_remove_devices(struct device *dev, void *c)
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{
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struct platform_device *pdev = to_platform_device(dev);
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platform_device_unregister(pdev);
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return 0;
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}
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static int omap_ocp2scp_probe(struct platform_device *pdev)
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{
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int ret;
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u32 reg;
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void __iomem *regs;
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struct resource *res;
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struct device_node *np = pdev->dev.of_node;
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if (np) {
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ret = of_platform_populate(np, NULL, NULL, &pdev->dev);
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if (ret) {
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dev_err(&pdev->dev,
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"failed to add resources for ocp2scp child\n");
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goto err0;
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}
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}
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pm_runtime_enable(&pdev->dev);
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/*
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* As per AM572x TRM: http://www.ti.com/lit/ug/spruhz6/spruhz6.pdf
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* under section 26.3.2.2, table 26-26 OCP2SCP TIMING Caution;
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* As per OMAP4430 TRM: http://www.ti.com/lit/ug/swpu231ap/swpu231ap.pdf
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* under section 23.12.6.2.2 , Table 23-1213 OCP2SCP TIMING Caution;
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* As per OMAP4460 TRM: http://www.ti.com/lit/ug/swpu235ab/swpu235ab.pdf
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* under section 23.12.6.2.2, Table 23-1213 OCP2SCP TIMING Caution;
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* As per OMAP543x TRM http://www.ti.com/lit/pdf/swpu249
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* under section 27.3.2.2, Table 27-27 OCP2SCP TIMING Caution;
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*
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* Read path of OCP2SCP is not working properly due to low reset value
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* of SYNC2 parameter in OCP2SCP. Suggested reset value is 0x6 or more.
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*/
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if (!of_device_is_compatible(np, "ti,am437x-ocp2scp")) {
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(regs)) {
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ret = PTR_ERR(regs);
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goto err1;
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}
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pm_runtime_get_sync(&pdev->dev);
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reg = readl_relaxed(regs + OCP2SCP_TIMING);
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reg &= ~(SYNC2_MASK);
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reg |= 0x6;
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writel_relaxed(reg, regs + OCP2SCP_TIMING);
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pm_runtime_put_sync(&pdev->dev);
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}
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return 0;
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err1:
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pm_runtime_disable(&pdev->dev);
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err0:
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device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
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return ret;
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}
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static int omap_ocp2scp_remove(struct platform_device *pdev)
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{
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pm_runtime_disable(&pdev->dev);
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device_for_each_child(&pdev->dev, NULL, ocp2scp_remove_devices);
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return 0;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id omap_ocp2scp_id_table[] = {
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{ .compatible = "ti,omap-ocp2scp" },
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{ .compatible = "ti,am437x-ocp2scp" },
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{}
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};
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MODULE_DEVICE_TABLE(of, omap_ocp2scp_id_table);
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#endif
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static struct platform_driver omap_ocp2scp_driver = {
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.probe = omap_ocp2scp_probe,
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.remove = omap_ocp2scp_remove,
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.driver = {
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.name = "omap-ocp2scp",
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.of_match_table = of_match_ptr(omap_ocp2scp_id_table),
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},
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};
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module_platform_driver(omap_ocp2scp_driver);
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MODULE_ALIAS("platform:omap-ocp2scp");
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MODULE_AUTHOR("Texas Instruments Inc.");
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MODULE_DESCRIPTION("OMAP OCP2SCP driver");
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MODULE_LICENSE("GPL v2");
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