/* * Copyright (c) 2015-2016 MediaTek Inc. * Author: Yong Wu <yong.wu@mediatek.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. * * 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/clk.h> #include <linux/component.h> #include <linux/device.h> #include <linux/err.h> #include <linux/io.h> #include <linux/of.h> #include <linux/of_platform.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <soc/mediatek/smi.h> #define SMI_LARB_MMU_EN 0xf00 struct mtk_smi { struct device *dev; struct clk *clk_apb, *clk_smi; }; struct mtk_smi_larb { /* larb: local arbiter */ struct mtk_smi smi; void __iomem *base; struct device *smi_common_dev; u32 *mmu; }; static int mtk_smi_enable(const struct mtk_smi *smi) { int ret; ret = pm_runtime_get_sync(smi->dev); if (ret < 0) return ret; ret = clk_prepare_enable(smi->clk_apb); if (ret) goto err_put_pm; ret = clk_prepare_enable(smi->clk_smi); if (ret) goto err_disable_apb; return 0; err_disable_apb: clk_disable_unprepare(smi->clk_apb); err_put_pm: pm_runtime_put_sync(smi->dev); return ret; } static void mtk_smi_disable(const struct mtk_smi *smi) { clk_disable_unprepare(smi->clk_smi); clk_disable_unprepare(smi->clk_apb); pm_runtime_put_sync(smi->dev); } int mtk_smi_larb_get(struct device *larbdev) { struct mtk_smi_larb *larb = dev_get_drvdata(larbdev); struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev); int ret; /* Enable the smi-common's power and clocks */ ret = mtk_smi_enable(common); if (ret) return ret; /* Enable the larb's power and clocks */ ret = mtk_smi_enable(&larb->smi); if (ret) { mtk_smi_disable(common); return ret; } /* Configure the iommu info for this larb */ writel(*larb->mmu, larb->base + SMI_LARB_MMU_EN); return 0; } void mtk_smi_larb_put(struct device *larbdev) { struct mtk_smi_larb *larb = dev_get_drvdata(larbdev); struct mtk_smi *common = dev_get_drvdata(larb->smi_common_dev); /* * Don't de-configure the iommu info for this larb since there may be * several modules in this larb. * The iommu info will be reset after power off. */ mtk_smi_disable(&larb->smi); mtk_smi_disable(common); } static int mtk_smi_larb_bind(struct device *dev, struct device *master, void *data) { struct mtk_smi_larb *larb = dev_get_drvdata(dev); struct mtk_smi_iommu *smi_iommu = data; unsigned int i; for (i = 0; i < smi_iommu->larb_nr; i++) { if (dev == smi_iommu->larb_imu[i].dev) { /* The 'mmu' may be updated in iommu-attach/detach. */ larb->mmu = &smi_iommu->larb_imu[i].mmu; return 0; } } return -ENODEV; } static void mtk_smi_larb_unbind(struct device *dev, struct device *master, void *data) { /* Do nothing as the iommu is always enabled. */ } static const struct component_ops mtk_smi_larb_component_ops = { .bind = mtk_smi_larb_bind, .unbind = mtk_smi_larb_unbind, }; static int mtk_smi_larb_probe(struct platform_device *pdev) { struct mtk_smi_larb *larb; struct resource *res; struct device *dev = &pdev->dev; struct device_node *smi_node; struct platform_device *smi_pdev; if (!dev->pm_domain) return -EPROBE_DEFER; larb = devm_kzalloc(dev, sizeof(*larb), GFP_KERNEL); if (!larb) return -ENOMEM; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); larb->base = devm_ioremap_resource(dev, res); if (IS_ERR(larb->base)) return PTR_ERR(larb->base); larb->smi.clk_apb = devm_clk_get(dev, "apb"); if (IS_ERR(larb->smi.clk_apb)) return PTR_ERR(larb->smi.clk_apb); larb->smi.clk_smi = devm_clk_get(dev, "smi"); if (IS_ERR(larb->smi.clk_smi)) return PTR_ERR(larb->smi.clk_smi); larb->smi.dev = dev; smi_node = of_parse_phandle(dev->of_node, "mediatek,smi", 0); if (!smi_node) return -EINVAL; smi_pdev = of_find_device_by_node(smi_node); of_node_put(smi_node); if (smi_pdev) { larb->smi_common_dev = &smi_pdev->dev; } else { dev_err(dev, "Failed to get the smi_common device\n"); return -EINVAL; } pm_runtime_enable(dev); platform_set_drvdata(pdev, larb); return component_add(dev, &mtk_smi_larb_component_ops); } static int mtk_smi_larb_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); component_del(&pdev->dev, &mtk_smi_larb_component_ops); return 0; } static const struct of_device_id mtk_smi_larb_of_ids[] = { { .compatible = "mediatek,mt8173-smi-larb",}, {} }; static struct platform_driver mtk_smi_larb_driver = { .probe = mtk_smi_larb_probe, .remove = mtk_smi_larb_remove, .driver = { .name = "mtk-smi-larb", .of_match_table = mtk_smi_larb_of_ids, } }; static int mtk_smi_common_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct mtk_smi *common; if (!dev->pm_domain) return -EPROBE_DEFER; common = devm_kzalloc(dev, sizeof(*common), GFP_KERNEL); if (!common) return -ENOMEM; common->dev = dev; common->clk_apb = devm_clk_get(dev, "apb"); if (IS_ERR(common->clk_apb)) return PTR_ERR(common->clk_apb); common->clk_smi = devm_clk_get(dev, "smi"); if (IS_ERR(common->clk_smi)) return PTR_ERR(common->clk_smi); pm_runtime_enable(dev); platform_set_drvdata(pdev, common); return 0; } static int mtk_smi_common_remove(struct platform_device *pdev) { pm_runtime_disable(&pdev->dev); return 0; } static const struct of_device_id mtk_smi_common_of_ids[] = { { .compatible = "mediatek,mt8173-smi-common", }, {} }; static struct platform_driver mtk_smi_common_driver = { .probe = mtk_smi_common_probe, .remove = mtk_smi_common_remove, .driver = { .name = "mtk-smi-common", .of_match_table = mtk_smi_common_of_ids, } }; static int __init mtk_smi_init(void) { int ret; ret = platform_driver_register(&mtk_smi_common_driver); if (ret != 0) { pr_err("Failed to register SMI driver\n"); return ret; } ret = platform_driver_register(&mtk_smi_larb_driver); if (ret != 0) { pr_err("Failed to register SMI-LARB driver\n"); goto err_unreg_smi; } return ret; err_unreg_smi: platform_driver_unregister(&mtk_smi_common_driver); return ret; } subsys_initcall(mtk_smi_init);