/* 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 #include #include #include #include #include #include #include #include #include #include #include #include "coresight-priv.h" #define funnel_writel(drvdata, val, off) \ __raw_writel((val), drvdata->base + off) #define funnel_readl(drvdata, off) \ __raw_readl(drvdata->base + off) #define FUNNEL_LOCK(drvdata) \ do { \ mb(); \ funnel_writel(drvdata, 0x0, CORESIGHT_LAR); \ } while (0) #define FUNNEL_UNLOCK(drvdata) \ do { \ funnel_writel(drvdata, CORESIGHT_UNLOCK, CORESIGHT_LAR); \ mb(); \ } while (0) #define FUNNEL_FUNCTL (0x000) #define FUNNEL_PRICTL (0x004) #define FUNNEL_ITATBDATA0 (0xEEC) #define FUNNEL_ITATBCTR2 (0xEF0) #define FUNNEL_ITATBCTR1 (0xEF4) #define FUNNEL_ITATBCTR0 (0xEF8) #define FUNNEL_HOLDTIME_MASK (0xF00) #define FUNNEL_HOLDTIME_SHFT (0x8) #define FUNNEL_HOLDTIME (0x7 << FUNNEL_HOLDTIME_SHFT) struct funnel_drvdata { void __iomem *base; struct device *dev; struct coresight_device *csdev; struct clk *clk; uint32_t priority; }; static void __funnel_enable(struct funnel_drvdata *drvdata, int port) { uint32_t functl; FUNNEL_UNLOCK(drvdata); functl = funnel_readl(drvdata, FUNNEL_FUNCTL); functl &= ~FUNNEL_HOLDTIME_MASK; functl |= FUNNEL_HOLDTIME; functl |= (1 << port); funnel_writel(drvdata, functl, FUNNEL_FUNCTL); funnel_writel(drvdata, drvdata->priority, FUNNEL_PRICTL); FUNNEL_LOCK(drvdata); } static int funnel_enable(struct coresight_device *csdev, int inport, int outport) { struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); int ret; ret = clk_prepare_enable(drvdata->clk); if (ret) return ret; __funnel_enable(drvdata, inport); dev_info(drvdata->dev, "FUNNEL inport %d enabled\n", inport); return 0; } static void __funnel_disable(struct funnel_drvdata *drvdata, int inport) { uint32_t functl; FUNNEL_UNLOCK(drvdata); functl = funnel_readl(drvdata, FUNNEL_FUNCTL); functl &= ~(1 << inport); funnel_writel(drvdata, functl, FUNNEL_FUNCTL); FUNNEL_LOCK(drvdata); } static void funnel_disable(struct coresight_device *csdev, int inport, int outport) { struct funnel_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent); __funnel_disable(drvdata, inport); clk_disable_unprepare(drvdata->clk); dev_info(drvdata->dev, "FUNNEL inport %d disabled\n", inport); } static const struct coresight_ops_link funnel_link_ops = { .enable = funnel_enable, .disable = funnel_disable, }; static const struct coresight_ops funnel_cs_ops = { .link_ops = &funnel_link_ops, }; static ssize_t funnel_show_priority(struct device *dev, struct device_attribute *attr, char *buf) { struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); unsigned long val = drvdata->priority; return scnprintf(buf, PAGE_SIZE, "%#lx\n", val); } static ssize_t funnel_store_priority(struct device *dev, struct device_attribute *attr, const char *buf, size_t size) { struct funnel_drvdata *drvdata = dev_get_drvdata(dev->parent); unsigned long val; if (sscanf(buf, "%lx", &val) != 1) return -EINVAL; drvdata->priority = val; return size; } static DEVICE_ATTR(priority, S_IRUGO | S_IWUSR, funnel_show_priority, funnel_store_priority); static struct attribute *funnel_attrs[] = { &dev_attr_priority.attr, NULL, }; static struct attribute_group funnel_attr_grp = { .attrs = funnel_attrs, }; static const struct attribute_group *funnel_attr_grps[] = { &funnel_attr_grp, NULL, }; static int __devinit funnel_probe(struct platform_device *pdev) { int ret; struct device *dev = &pdev->dev; struct coresight_platform_data *pdata; struct funnel_drvdata *drvdata; struct resource *res; struct coresight_desc *desc; 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, "funnel-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.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_MERG; desc->ops = &funnel_cs_ops; desc->pdata = pdev->dev.platform_data; desc->dev = &pdev->dev; desc->groups = funnel_attr_grps; desc->owner = THIS_MODULE; drvdata->csdev = coresight_register(desc); if (IS_ERR(drvdata->csdev)) return PTR_ERR(drvdata->csdev); dev_info(dev, "FUNNEL initialized\n"); return 0; } static int __devexit funnel_remove(struct platform_device *pdev) { struct funnel_drvdata *drvdata = platform_get_drvdata(pdev); coresight_unregister(drvdata->csdev); return 0; } static struct of_device_id funnel_match[] = { {.compatible = "arm,coresight-funnel"}, {} }; static struct platform_driver funnel_driver = { .probe = funnel_probe, .remove = __devexit_p(funnel_remove), .driver = { .name = "coresight-funnel", .owner = THIS_MODULE, .of_match_table = funnel_match, }, }; static int __init funnel_init(void) { return platform_driver_register(&funnel_driver); } module_init(funnel_init); static void __exit funnel_exit(void) { platform_driver_unregister(&funnel_driver); } module_exit(funnel_exit); MODULE_LICENSE("GPL v2"); MODULE_DESCRIPTION("CoreSight Funnel driver");