cregit-Linux how code gets into the kernel

Release 4.10 drivers/bus/vexpress-config.c

Directory: drivers/bus
/*
 * 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.
 *
 * Copyright (C) 2014 ARM Limited
 */

#include <linux/err.h>
#include <linux/init.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/vexpress.h>



struct vexpress_config_bridge {
	
struct vexpress_config_bridge_ops *ops;
	
void *context;
};


static DEFINE_MUTEX(vexpress_config_mutex);

static struct class *vexpress_config_class;

static u32 vexpress_config_site_master = VEXPRESS_SITE_MASTER;



void vexpress_config_set_master(u32 site) { vexpress_config_site_master = site; }

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pawel mollpawel moll12100.00%1100.00%
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u32 vexpress_config_get_master(void) { return vexpress_config_site_master; }

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void vexpress_config_lock(void *arg) { mutex_lock(&vexpress_config_mutex); }

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void vexpress_config_unlock(void *arg) { mutex_unlock(&vexpress_config_mutex); }

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static void vexpress_config_find_prop(struct device_node *node, const char *name, u32 *val) { /* Default value */ *val = 0; of_node_get(node); while (node) { if (of_property_read_u32(node, name, val) == 0) { of_node_put(node); return; } node = of_get_next_parent(node); } }

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pawel mollpawel moll65100.00%1100.00%
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int vexpress_config_get_topo(struct device_node *node, u32 *site, u32 *position, u32 *dcc) { vexpress_config_find_prop(node, "arm,vexpress,site", site); if (*site == VEXPRESS_SITE_MASTER) *site = vexpress_config_site_master; if (WARN_ON(vexpress_config_site_master == VEXPRESS_SITE_MASTER)) return -EINVAL; vexpress_config_find_prop(node, "arm,vexpress,position", position); vexpress_config_find_prop(node, "arm,vexpress,dcc", dcc); return 0; }

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pawel mollpawel moll77100.00%1100.00%
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static void vexpress_config_devres_release(struct device *dev, void *res) { struct vexpress_config_bridge *bridge = dev_get_drvdata(dev->parent); struct regmap *regmap = res; bridge->ops->regmap_exit(regmap, bridge->context); }

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struct regmap *devm_regmap_init_vexpress_config(struct device *dev) { struct vexpress_config_bridge *bridge; struct regmap *regmap; struct regmap **res; if (WARN_ON(dev->parent->class != vexpress_config_class)) return ERR_PTR(-ENODEV); bridge = dev_get_drvdata(dev->parent); if (WARN_ON(!bridge)) return ERR_PTR(-EINVAL); res = devres_alloc(vexpress_config_devres_release, sizeof(*res), GFP_KERNEL); if (!res) return ERR_PTR(-ENOMEM); regmap = (bridge->ops->regmap_init)(dev, bridge->context); if (IS_ERR(regmap)) { devres_free(res); return regmap; } *res = regmap; devres_add(dev, res); return regmap; }

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pawel mollpawel moll14698.65%150.00%
nicolas boichatnicolas boichat21.35%150.00%
Total148100.00%2100.00%

EXPORT_SYMBOL_GPL(devm_regmap_init_vexpress_config);
struct device *vexpress_config_bridge_register(struct device *parent, struct vexpress_config_bridge_ops *ops, void *context) { struct device *dev; struct vexpress_config_bridge *bridge; if (!vexpress_config_class) { vexpress_config_class = class_create(THIS_MODULE, "vexpress-config"); if (IS_ERR(vexpress_config_class)) return (void *)vexpress_config_class; } dev = device_create(vexpress_config_class, parent, 0, NULL, "%s.bridge", dev_name(parent)); if (IS_ERR(dev)) return dev; bridge = devm_kmalloc(dev, sizeof(*bridge), GFP_KERNEL); if (!bridge) { put_device(dev); device_unregister(dev); return ERR_PTR(-ENOMEM); } bridge->ops = ops; bridge->context = context; dev_set_drvdata(dev, bridge); dev_dbg(parent, "Registered bridge '%s', parent node %p\n", dev_name(dev), parent->of_node); return dev; }

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pawel mollpawel moll168100.00%1100.00%
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static int vexpress_config_node_match(struct device *dev, const void *data) { const struct device_node *node = data; dev_dbg(dev, "Parent node %p, looking for %p\n", dev->parent->of_node, node); return dev->parent->of_node == node; }

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pawel mollpawel moll48100.00%1100.00%
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static int vexpress_config_populate(struct device_node *node) { struct device_node *bridge; struct device *parent; int ret; bridge = of_parse_phandle(node, "arm,vexpress,config-bridge", 0); if (!bridge) return -EINVAL; parent = class_find_device(vexpress_config_class, NULL, bridge, vexpress_config_node_match); of_node_put(bridge); if (WARN_ON(!parent)) return -ENODEV; ret = of_platform_populate(node, NULL, NULL, parent); put_device(parent); return ret; }

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pawel mollpawel moll7781.05%133.33%
johan hovoldjohan hovold1313.68%133.33%
peter chenpeter chen55.26%133.33%
Total95100.00%3100.00%


static int __init vexpress_config_init(void) { int err = 0; struct device_node *node; /* Need the config devices early, before the "normal" devices... */ for_each_compatible_node(node, NULL, "arm,vexpress,config-bus") { err = vexpress_config_populate(node); if (err) { of_node_put(node); break; } } return err; }

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pawel mollpawel moll4586.54%150.00%
amitoj kaur chawlaamitoj kaur chawla713.46%150.00%
Total52100.00%2100.00%

postcore_initcall(vexpress_config_init);

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pawel mollpawel moll77896.05%116.67%
johan hovoldjohan hovold131.60%116.67%
amitoj kaur chawlaamitoj kaur chawla70.86%116.67%
arnd bergmannarnd bergmann50.62%116.67%
peter chenpeter chen50.62%116.67%
nicolas boichatnicolas boichat20.25%116.67%
Total810100.00%6100.00%
Directory: drivers/bus
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