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118 lines
3.1 KiB
118 lines
3.1 KiB
// 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 <[email protected]> |
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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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