| /* Copyright (c) 2011-2013, The Linux Foundation. All rights reserved. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 and |
| * only 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/kernel.h> |
| #include <linux/module.h> |
| #include <linux/init.h> |
| #include <linux/device.h> |
| #include <linux/platform_device.h> |
| #include <linux/io.h> |
| #include <linux/err.h> |
| #include <linux/slab.h> |
| #include <linux/clk.h> |
| #include <linux/of_coresight.h> |
| #include <linux/coresight.h> |
| |
| #include "coresight-priv.h" |
| |
| #define replicator_writel(drvdata, val, off) \ |
| __raw_writel((val), drvdata->base + off) |
| #define replicator_readl(drvdata, off) \ |
| __raw_readl(drvdata->base + off) |
| |
| #define REPLICATOR_LOCK(drvdata) \ |
| do { \ |
| mb(); \ |
| replicator_writel(drvdata, 0x0, CORESIGHT_LAR); \ |
| } while (0) |
| #define REPLICATOR_UNLOCK(drvdata) \ |
| do { \ |
| replicator_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \ |
| mb(); \ |
| } while (0) |
| |
| #define REPLICATOR_IDFILTER0 (0x000) |
| #define REPLICATOR_IDFILTER1 (0x004) |
| #define REPLICATOR_ITATBCTR0 (0xEFC) |
| #define REPLICATOR_ITATBCTR1 (0xEF8) |
| |
| struct replicator_drvdata { |
| void __iomem *base; |
| struct device *dev; |
| struct coresight_device *csdev; |
| struct clk *clk; |
| }; |
| |
| static void __replicator_enable(struct replicator_drvdata *drvdata, int outport) |
| { |
| REPLICATOR_UNLOCK(drvdata); |
| |
| if (outport == 0) { |
| replicator_writel(drvdata, 0x0, REPLICATOR_IDFILTER0); |
| replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER1); |
| } else { |
| replicator_writel(drvdata, 0x0, REPLICATOR_IDFILTER1); |
| replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER0); |
| } |
| |
| REPLICATOR_LOCK(drvdata); |
| } |
| |
| static int replicator_enable(struct coresight_device *csdev, int inport, |
| int outport) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| int ret; |
| |
| ret = clk_prepare_enable(drvdata->clk); |
| if (ret) |
| return ret; |
| |
| __replicator_enable(drvdata, outport); |
| |
| dev_info(drvdata->dev, "REPLICATOR enabled\n"); |
| return 0; |
| } |
| |
| static void __replicator_disable(struct replicator_drvdata *drvdata, |
| int outport) |
| { |
| REPLICATOR_UNLOCK(drvdata); |
| |
| if (outport == 0) |
| replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER0); |
| else |
| replicator_writel(drvdata, 0xFF, REPLICATOR_IDFILTER1); |
| |
| REPLICATOR_LOCK(drvdata); |
| } |
| |
| static void replicator_disable(struct coresight_device *csdev, int inport, |
| int outport) |
| { |
| struct replicator_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); |
| |
| __replicator_disable(drvdata, outport); |
| |
| clk_disable_unprepare(drvdata->clk); |
| |
| dev_info(drvdata->dev, "REPLICATOR disabled\n"); |
| } |
| |
| static const struct coresight_ops_link replicator_link_ops = { |
| .enable = replicator_enable, |
| .disable = replicator_disable, |
| }; |
| |
| static const struct coresight_ops replicator_cs_ops = { |
| .link_ops = &replicator_link_ops, |
| }; |
| |
| static int __devinit replicator_probe(struct platform_device *pdev) |
| { |
| int ret; |
| struct device *dev = &pdev->dev; |
| struct coresight_platform_data *pdata; |
| struct replicator_drvdata *drvdata; |
| struct resource *res; |
| struct coresight_desc *desc; |
| |
| if (coresight_fuse_access_disabled()) |
| return -EPERM; |
| |
| if (pdev->dev.of_node) { |
| pdata = of_get_coresight_platform_data(dev, pdev->dev.of_node); |
| if (IS_ERR(pdata)) |
| return PTR_ERR(pdata); |
| pdev->dev.platform_data = pdata; |
| } |
| |
| drvdata = devm_kzalloc(dev, sizeof(*drvdata), GFP_KERNEL); |
| if (!drvdata) |
| return -ENOMEM; |
| drvdata->dev = &pdev->dev; |
| platform_set_drvdata(pdev, drvdata); |
| |
| res = platform_get_resource_byname(pdev, IORESOURCE_MEM, |
| "replicator-base"); |
| if (!res) |
| return -ENODEV; |
| |
| drvdata->base = devm_ioremap(dev, res->start, resource_size(res)); |
| if (!drvdata->base) |
| return -ENOMEM; |
| |
| drvdata->clk = devm_clk_get(dev, "core_clk"); |
| if (IS_ERR(drvdata->clk)) |
| return PTR_ERR(drvdata->clk); |
| |
| ret = clk_set_rate(drvdata->clk, CORESIGHT_CLK_RATE_TRACE); |
| if (ret) |
| return ret; |
| |
| desc = devm_kzalloc(dev, sizeof(*desc), GFP_KERNEL); |
| if (!desc) |
| return -ENOMEM; |
| desc->type = CORESIGHT_DEV_TYPE_LINK; |
| desc->subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_LINK_SPLIT; |
| desc->ops = &replicator_cs_ops; |
| desc->pdata = pdev->dev.platform_data; |
| desc->dev = &pdev->dev; |
| desc->owner = THIS_MODULE; |
| drvdata->csdev = coresight_register(desc); |
| if (IS_ERR(drvdata->csdev)) |
| return PTR_ERR(drvdata->csdev); |
| |
| dev_info(dev, "REPLICATOR initialized\n"); |
| return 0; |
| } |
| |
| static int __devexit replicator_remove(struct platform_device *pdev) |
| { |
| struct replicator_drvdata *drvdata = platform_get_drvdata(pdev); |
| |
| coresight_unregister(drvdata->csdev); |
| return 0; |
| } |
| |
| static struct of_device_id replicator_match[] = { |
| {.compatible = "qcom,coresight-replicator"}, |
| {} |
| }; |
| |
| static struct platform_driver replicator_driver = { |
| .probe = replicator_probe, |
| .remove = __devexit_p(replicator_remove), |
| .driver = { |
| .name = "coresight-replicator", |
| .owner = THIS_MODULE, |
| .of_match_table = replicator_match, |
| }, |
| }; |
| |
| static int __init replicator_init(void) |
| { |
| return platform_driver_register(&replicator_driver); |
| } |
| module_init(replicator_init); |
| |
| static void __exit replicator_exit(void) |
| { |
| platform_driver_unregister(&replicator_driver); |
| } |
| module_exit(replicator_exit); |
| |
| MODULE_LICENSE("GPL v2"); |
| MODULE_DESCRIPTION("CoreSight Replicator driver"); |