426 lines
8.2 KiB
C
426 lines
8.2 KiB
C
/*
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* driver.c - barebox driver model
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*
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* Copyright (c) 2007 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/**
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* @file
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* @brief barebox's driver model, and devinfo command
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*/
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#include <common.h>
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#include <command.h>
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#include <driver.h>
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#include <malloc.h>
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#include <console.h>
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#include <linux/ctype.h>
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#include <errno.h>
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#include <fs.h>
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#include <of.h>
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#include <linux/list.h>
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#include <complete.h>
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#include <pinctrl.h>
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LIST_HEAD(device_list);
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EXPORT_SYMBOL(device_list);
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LIST_HEAD(driver_list);
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EXPORT_SYMBOL(driver_list);
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static LIST_HEAD(active);
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struct device_d *get_device_by_name(const char *name)
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{
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struct device_d *dev;
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for_each_device(dev) {
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if(!strcmp(dev_name(dev), name))
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return dev;
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}
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return NULL;
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}
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static struct device_d *get_device_by_name_id(const char *name, int id)
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{
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struct device_d *dev;
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for_each_device(dev) {
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if(!strcmp(dev->name, name) && id == dev->id)
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return dev;
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}
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return NULL;
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}
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int get_free_deviceid(const char *name_template)
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{
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int i = 0;
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while (1) {
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if (!get_device_by_name_id(name_template, i))
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return i;
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i++;
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};
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}
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int device_probe(struct device_d *dev)
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{
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int ret;
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pinctrl_select_state_default(dev);
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ret = dev->bus->probe(dev);
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if (ret) {
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dev_err(dev, "probe failed: %s\n", strerror(-ret));
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return ret;
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}
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list_add(&dev->active, &active);
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return 0;
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}
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int device_detect(struct device_d *dev)
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{
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if (!dev->detect)
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return -ENOSYS;
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return dev->detect(dev);
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}
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int device_detect_by_name(const char *devname)
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{
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struct device_d *dev = get_device_by_name(devname);
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if (!dev)
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return -ENODEV;
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return device_detect(dev);
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}
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static int match(struct driver_d *drv, struct device_d *dev)
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{
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int ret;
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if (dev->driver)
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return -1;
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dev->driver = drv;
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if (dev->bus->match(dev, drv))
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goto err_out;
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ret = device_probe(dev);
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if (ret)
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goto err_out;
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return 0;
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err_out:
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dev->driver = NULL;
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return -1;
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}
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int register_device(struct device_d *new_device)
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{
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struct driver_d *drv;
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if (new_device->id == DEVICE_ID_DYNAMIC) {
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new_device->id = get_free_deviceid(new_device->name);
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} else {
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if (get_device_by_name_id(new_device->name, new_device->id)) {
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eprintf("register_device: already registered %s\n",
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dev_name(new_device));
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return -EINVAL;
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}
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}
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debug ("register_device: %s\n", dev_name(new_device));
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list_add_tail(&new_device->list, &device_list);
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INIT_LIST_HEAD(&new_device->children);
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INIT_LIST_HEAD(&new_device->cdevs);
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INIT_LIST_HEAD(&new_device->parameters);
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INIT_LIST_HEAD(&new_device->active);
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INIT_LIST_HEAD(&new_device->bus_list);
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if (new_device->bus) {
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if (!new_device->parent)
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new_device->parent = new_device->bus->dev;
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list_add_tail(&new_device->bus_list, &new_device->bus->device_list);
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bus_for_each_driver(new_device->bus, drv) {
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if (!match(drv, new_device))
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break;
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}
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}
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if (new_device->parent)
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list_add_tail(&new_device->sibling, &new_device->parent->children);
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return 0;
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}
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EXPORT_SYMBOL(register_device);
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int unregister_device(struct device_d *old_dev)
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{
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struct cdev *cdev, *ct;
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struct device_d *child, *dt;
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dev_dbg(old_dev, "unregister\n");
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dev_remove_parameters(old_dev);
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if (old_dev->driver)
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old_dev->bus->remove(old_dev);
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list_for_each_entry_safe(child, dt, &old_dev->children, sibling) {
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dev_dbg(old_dev, "unregister child %s\n", dev_name(child));
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unregister_device(child);
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}
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list_for_each_entry_safe(cdev, ct, &old_dev->cdevs, devices_list) {
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if (cdev->flags & DEVFS_IS_PARTITION) {
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dev_dbg(old_dev, "unregister part %s\n", cdev->name);
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devfs_del_partition(cdev->name);
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}
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}
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list_del(&old_dev->list);
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list_del(&old_dev->bus_list);
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list_del(&old_dev->active);
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/* remove device from parents child list */
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if (old_dev->parent)
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list_del(&old_dev->sibling);
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return 0;
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}
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EXPORT_SYMBOL(unregister_device);
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struct driver_d *get_driver_by_name(const char *name)
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{
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struct driver_d *drv;
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for_each_driver(drv) {
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if(!strcmp(name, drv->name))
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return drv;
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}
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return NULL;
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}
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int register_driver(struct driver_d *drv)
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{
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struct device_d *dev = NULL;
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debug("register_driver: %s\n", drv->name);
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BUG_ON(!drv->bus);
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list_add_tail(&drv->list, &driver_list);
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list_add_tail(&drv->bus_list, &drv->bus->driver_list);
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bus_for_each_device(drv->bus, dev)
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match(drv, dev);
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return 0;
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}
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EXPORT_SYMBOL(register_driver);
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struct resource *dev_get_resource(struct device_d *dev, unsigned long type,
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int num)
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{
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int i, n = 0;
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for (i = 0; i < dev->num_resources; i++) {
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struct resource *res = &dev->resource[i];
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if (resource_type(res) == type) {
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if (n == num)
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return res;
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n++;
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}
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}
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return NULL;
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}
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void *dev_get_mem_region(struct device_d *dev, int num)
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{
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struct resource *res;
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res = dev_get_resource(dev, IORESOURCE_MEM, num);
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if (!res)
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return NULL;
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return (void __force *)res->start;
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}
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EXPORT_SYMBOL(dev_get_mem_region);
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struct resource *dev_get_resource_by_name(struct device_d *dev,
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unsigned long type,
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const char *name)
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{
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int i;
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for (i = 0; i < dev->num_resources; i++) {
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struct resource *res = &dev->resource[i];
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if (resource_type(res) != type)
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continue;
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if (!res->name)
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continue;
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if (!strcmp(name, res->name))
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return res;
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}
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return NULL;
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}
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void *dev_get_mem_region_by_name(struct device_d *dev, const char *name)
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{
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struct resource *res;
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res = dev_get_resource_by_name(dev, IORESOURCE_MEM, name);
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if (!res)
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return NULL;
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return (void __force *)res->start;
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}
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EXPORT_SYMBOL(dev_get_mem_region_by_name);
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void __iomem *dev_request_mem_region_by_name(struct device_d *dev, const char *name)
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{
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struct resource *res;
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res = dev_get_resource_by_name(dev, IORESOURCE_MEM, name);
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if (!res)
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return NULL;
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res = request_iomem_region(dev_name(dev), res->start, res->end);
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if (!res)
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return NULL;
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return (void __force __iomem *)res->start;
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}
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EXPORT_SYMBOL(dev_request_mem_region_by_name);
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void __iomem *dev_request_mem_region(struct device_d *dev, int num)
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{
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struct resource *res;
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res = dev_get_resource(dev, IORESOURCE_MEM, num);
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if (!res)
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return NULL;
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res = request_iomem_region(dev_name(dev), res->start, res->end);
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if (!res)
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return NULL;
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return (void __force __iomem *)res->start;
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}
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EXPORT_SYMBOL(dev_request_mem_region);
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int dev_protect(struct device_d *dev, size_t count, unsigned long offset, int prot)
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{
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printf("%s: currently broken\n", __func__);
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return -EINVAL;
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}
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int generic_memmap_ro(struct cdev *cdev, void **map, int flags)
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{
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if (!cdev->dev)
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return -EINVAL;
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if (flags & PROT_WRITE)
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return -EACCES;
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*map = dev_get_mem_region(cdev->dev, 0);
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return 0;
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}
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int generic_memmap_rw(struct cdev *cdev, void **map, int flags)
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{
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if (!cdev->dev)
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return -EINVAL;
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*map = dev_get_mem_region(cdev->dev, 0);
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return 0;
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}
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int dummy_probe(struct device_d *dev)
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{
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return 0;
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}
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EXPORT_SYMBOL(dummy_probe);
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const char *dev_id(const struct device_d *dev)
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{
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static char buf[MAX_DRIVER_NAME + 16];
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if (dev->id != DEVICE_ID_SINGLE)
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snprintf(buf, sizeof(buf), FORMAT_DRIVER_NAME_ID, dev->name, dev->id);
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else
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snprintf(buf, sizeof(buf), "%s", dev->name);
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return buf;
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}
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int dev_printf(int level, const struct device_d *dev, const char *format, ...)
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{
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va_list args;
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int ret = 0;
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if (level > barebox_loglevel)
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return 0;
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if (dev->driver && dev->driver->name)
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ret += printf("%s ", dev->driver->name);
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ret += printf("%s: ", dev_name(dev));
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va_start(args, format);
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ret += vprintf(format, args);
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va_end(args);
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return ret;
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}
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void devices_shutdown(void)
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{
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struct device_d *dev;
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list_for_each_entry(dev, &active, active) {
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if (dev->driver->remove)
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dev->driver->remove(dev);
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}
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}
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int dev_get_drvdata(struct device_d *dev, unsigned long *data)
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{
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if (dev->of_id_entry) {
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*data = dev->of_id_entry->data;
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return 0;
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}
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if (dev->id_entry) {
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*data = dev->id_entry->driver_data;
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return 0;
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}
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return -ENODEV;
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}
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