diff options
Diffstat (limited to 'target/linux/ubicom32/files/arch/ubicom32/mach-common/switch-core.c')
| -rw-r--r-- | target/linux/ubicom32/files/arch/ubicom32/mach-common/switch-core.c | 737 |
1 files changed, 737 insertions, 0 deletions
diff --git a/target/linux/ubicom32/files/arch/ubicom32/mach-common/switch-core.c b/target/linux/ubicom32/files/arch/ubicom32/mach-common/switch-core.c new file mode 100644 index 000000000..855aa068d --- /dev/null +++ b/target/linux/ubicom32/files/arch/ubicom32/mach-common/switch-core.c @@ -0,0 +1,737 @@ +/* + * arch/ubicom32/mach-common/switch-core.c + * Ubicom32 architecture switch and /proc/switch/... implementation. + * + * (C) Copyright 2009, Ubicom, Inc. + * Copyright (C) 2005 Felix Fietkau <openwrt@nbd.name> + * + * This file is part of the Ubicom32 Linux Kernel Port. + * + * The Ubicom32 Linux Kernel Port is free software: you can redistribute + * it and/or modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, either version 2 of the + * License, or (at your option) any later version. + * + * The Ubicom32 Linux Kernel Port 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. + * + * You should have received a copy of the GNU General Public License + * along with the Ubicom32 Linux Kernel Port. If not, + * see <http://www.gnu.org/licenses/>. + * + * Ubicom32 implementation derived from (with many thanks): + * arch/m68knommu + * arch/blackfin + * arch/parisc + * + * Basic doc of driver's /proc interface: + * /proc/switch/<interface>/ + * registers: read-only + * counters: read-only + * reset: write causes hardware reset + * enable: "0", "1" + * enable_vlan: "0", "1" + * port/<port-number>/ + * enabled: "0", "1" + * link state: read-only + * media: "AUTO", "1000FD", "100FD", "100HD", "10FD", "10HD" + * vlan/<port-number>/ + * ports: same syntax as for nvram's vlan*ports (eg. "1 2 3 4 5*") + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/uaccess.h> +#include <linux/ctype.h> +#include <linux/proc_fs.h> +#include <linux/list.h> +#include <linux/rwsem.h> +#include <linux/device.h> + +#include "switch-core.h" + +/* + * Pointer to the root of our filesystem + */ +static struct proc_dir_entry *switch_root; + +/* + * Lock used to manage access to the switch list + */ +DECLARE_RWSEM(switch_list_lock); +EXPORT_SYMBOL_GPL(switch_list_lock); + +/* + * List of switches we are managing + */ +LIST_HEAD(switch_list); +EXPORT_SYMBOL_GPL(switch_list); + +/* + * List of handlers we have + */ +LIST_HEAD(switch_handler_list); +EXPORT_SYMBOL_GPL(switch_handler_list); + +/* + * Keep track of all the handlers we added + */ +struct switch_handler_entry { + struct list_head node; + struct proc_dir_entry *parent; + struct switch_device *dev; + const struct switch_handler *handler; + int inst; +}; + +/* + * Keep track of all VLAN dirs we created + */ +struct switch_vlan_entry { + struct list_head node; + struct proc_dir_entry *pde; + int vlan_id; + const struct switch_handler *handlers; +}; + +/* + * switch_parse_vlan_ports + * Parse the vlan properties written to <driver>/vlan/<vlan_id>/ports + */ +void switch_parse_vlan_ports(struct switch_device *switch_dev, + char *buf, u32_t *untag, + u32_t *ports, u32_t *def) +{ + u32_t tag = 0; + *untag = 0; + *ports = 0; + *def = 0; + + + /* + * Skip any leading spaces + */ + while (isspace(*buf)) { + buf++; + } + + /* + * Parse out the string + */ + while (*buf) { + u32_t port = simple_strtoul(buf, &buf, 10); + u32_t mask = (1 << port); + + /* + * Parse out any flags + */ + while (*buf && !isspace(*buf)) { + switch (*buf++) { + case 't': + tag |= mask; + break; + case '*': + *def |= mask; + break; + } + } + *ports |= mask; + + /* + * Skip any spaces + */ + while (isspace(*buf)) { + buf++; + } + } + + *untag = ~tag & *ports; +} + +/* + * switch_proc_read + * Handle reads from the procfs, dispatches the driver specific handler + */ +static ssize_t switch_proc_read(struct file *file, char *buf, size_t count, + loff_t *ppos) +{ + struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode); + char *page; + int len = 0; + + page = kmalloc(SWITCH_MAX_BUFSZ, GFP_KERNEL); + if (!page) { + return -ENOBUFS; + } + + if (pde->data != NULL) { + struct switch_handler_entry *she = + (struct switch_handler_entry *)pde->data; + if (she->handler->read) { + len += she->handler->read(she->dev, page + len, + she->inst); + } + } + len += 1; + + if (*ppos < len) { + len = min_t(int, len - *ppos, count); + if (copy_to_user(buf, (page + *ppos), len)) { + kfree(page); + return -EFAULT; + } + *ppos += len; + } else { + len = 0; + } + + kfree(page); + + return len; +} + +/* + * switch_proc_write + * Handle writes from the procfs, dispatches the driver specific handler + */ +static ssize_t switch_proc_write(struct file *file, const char *buf, + size_t count, loff_t *data) +{ + struct proc_dir_entry *pde = PDE(file->f_dentry->d_inode); + char *page; + int ret = -EINVAL; + + page = kmalloc(count + 1, GFP_KERNEL); + if (page == NULL) + return -ENOBUFS; + + if (copy_from_user(page, buf, count)) { + kfree(page); + return -EINVAL; + } + page[count] = 0; + + if (pde->data != NULL) { + struct switch_handler_entry *she = + (struct switch_handler_entry *)pde->data; + if (she->handler->write) { + ret = she->handler->write(she->dev, page, she->inst); + if (ret >= 0) { + ret = count; + } + } + } + + kfree(page); + return ret; +} + +/* + * File operations for the proc_fs, we must cast here since proc_fs' definitions + * differ from file_operations definitions. + */ +static struct file_operations switch_proc_fops = { + .read = (ssize_t (*) (struct file *, char __user *, + size_t, loff_t *))switch_proc_read, + .write = (ssize_t (*) (struct file *, const char __user *, + size_t, loff_t *))switch_proc_write, +}; + +/* + * switch_add_handler + */ +static int switch_add_handler(struct switch_device *switch_dev, + struct proc_dir_entry *parent, + const struct switch_handler *handler, + int inst) +{ + struct switch_handler_entry *she; + struct proc_dir_entry *pde; + int mode; + + she = (struct switch_handler_entry *) + kzalloc(sizeof(struct switch_handler_entry), GFP_KERNEL); + if (!she) { + return -ENOMEM; + } + + INIT_LIST_HEAD(&she->node); + she->parent = parent; + she->dev = switch_dev; + she->inst = inst; + she->handler = handler; + list_add(&she->node, &switch_dev->handlers); + + mode = 0; + if (handler->read != NULL) { + mode |= S_IRUSR; + } + if (handler->write != NULL) { + mode |= S_IWUSR; + } + + pde = create_proc_entry(handler->name, mode, parent); + if (!pde) { + kfree(she); + printk("Failed to create node '%s' in parent %p\n", + handler->name, parent); + return -ENOMEM; + } + pde->data = (void *)she; + pde->proc_fops = &switch_proc_fops; + + return 0; +} + +/* + * switch_add_handlers + */ +static int switch_add_handlers(struct switch_device *switch_dev, + struct proc_dir_entry *parent, + const struct switch_handler *handlers, + int inst) +{ + while (handlers->name) { + int ret = switch_add_handler(switch_dev, + parent, handlers, inst); + if (ret) { + return ret; + } + handlers++; + } + + return 0; +} + +/* + * switch_remove_vlan_dirs + * Removes all vlan directories + * + * Assumes all vlan directories are empty, should be called after + * switch_remove_handlers + */ +static void switch_remove_vlan_dirs(struct switch_device *switch_dev) +{ + struct list_head *pos; + struct list_head *tmp; + struct switch_vlan_entry *sve; + + list_for_each_safe(pos, tmp, &switch_dev->vlan_dirs) { + sve = list_entry(pos, struct switch_vlan_entry, node); + list_del(pos); + remove_proc_entry(sve->pde->name, switch_dev->vlan_dir); + kfree(sve); + } +} + +/* + * switch_remove_handlers + * Removes all handlers registered to the given switch_device + */ +static void switch_remove_handlers(struct switch_device *switch_dev) +{ + struct list_head *pos; + struct list_head *tmp; + struct switch_handler_entry *she; + + list_for_each_safe(pos, tmp, &switch_dev->handlers) { + she = list_entry(pos, struct switch_handler_entry, node); + list_del(pos); + remove_proc_entry(she->handler->name, she->parent); + kfree(she); + } +} + +/* + * switch_unregister_proc_nodes + * Unregisters all proc nodes related to switch_dev + */ +void switch_unregister_proc_nodes(struct switch_device *switch_dev) +{ + switch_remove_handlers(switch_dev); + + if (switch_dev->port_dirs) { + int i; + + for (i = 0; i < switch_dev->ports; i++) { + if (switch_dev->port_dirs[i]) { + remove_proc_entry( + switch_dev->port_dirs[i]->name, + switch_dev->port_dir); + } + } + } + + if (switch_dev->port_dir) { + remove_proc_entry("port", switch_dev->driver_dir); + switch_dev->port_dir = NULL; + } + + if (switch_dev->reg_dir) { + remove_proc_entry("reg", switch_dev->reg_dir); + switch_dev->reg_dir = NULL; + } + + if (switch_dev->vlan_dir) { + switch_remove_vlan_dirs(switch_dev); + remove_proc_entry("vlan", switch_dev->driver_dir); + switch_dev->vlan_dir = NULL; + } + + if (switch_dev->driver_dir) { + remove_proc_entry(switch_dev->name, switch_root); + switch_dev->driver_dir = NULL; + } +} + +/* + * switch_remove_vlan_dir + * Removes vlan dir in switch/<switch_driver>/vlan/<vlan_id> + */ +int switch_remove_vlan_dir(struct switch_device *switch_dev, int vlan_id) +{ + struct list_head *pos; + struct switch_vlan_entry *sve = NULL; + + list_for_each(pos, &switch_dev->vlan_dirs) { + struct switch_vlan_entry *tmp = + list_entry(pos, struct switch_vlan_entry, node); + if (tmp->vlan_id == vlan_id) { + sve = tmp; + break; + } + } + + if (!sve) { + return -ENOENT; + } + + /* + * Remove it from the list + */ + list_del(pos); + + /* + * Remove the handlers + */ + while (sve->handlers->name) { + remove_proc_entry(sve->handlers->name, sve->pde); + sve->handlers++; + } + + /* + * Remove the proc entry for the <vlan_id> dir + */ + remove_proc_entry(sve->pde->name, switch_dev->vlan_dir); + + kfree(sve); + + return 0; +} + +/* + * switch_create_vlan_dir + * Creates vlan dir in switch/<switch_driver>/vlan/<vlan_id> + */ +int switch_create_vlan_dir(struct switch_device *switch_dev, + int vlan_id, const struct switch_handler *handlers) +{ + char s[14]; + struct proc_dir_entry *pde = NULL; + struct switch_vlan_entry *sve = NULL; + int ret; + struct list_head *pos; + + /* + * Check to see if it exists already + */ + list_for_each(pos, &switch_dev->vlan_dirs) { + sve = list_entry(pos, struct switch_vlan_entry, node); + if (sve->vlan_id == vlan_id) { + return -EEXIST; + } + } + sve = NULL; + + /* + * Create the vlan directory if we didn't have it before + */ + if (!switch_dev->vlan_dir) { + switch_dev->vlan_dir = proc_mkdir("vlan", + switch_dev->driver_dir); + if (!switch_dev->vlan_dir) { + goto fail; + } + if (switch_dev->vlan_handlers) { + ret = switch_add_handlers(switch_dev, + switch_dev->vlan_dir, + switch_dev->vlan_handlers, 0); + if (ret) { + goto fail; + } + } + } + + /* + * Create the vlan_id directory + */ + snprintf(s, 14, "%d", vlan_id); + pde = proc_mkdir(s, switch_dev->vlan_dir); + if (!pde) { + goto fail; + } + + /* + * Create the handlers for this vlan + */ + if (handlers) { + ret = switch_add_handlers(switch_dev, pde, handlers, vlan_id); + if (ret) { + goto fail; + } + } + + /* + * Keep track of all the switch vlan entries created + */ + sve = (struct switch_vlan_entry *) + kzalloc(sizeof(struct switch_vlan_entry), GFP_KERNEL); + if (!sve) { + goto fail; + } + INIT_LIST_HEAD(&sve->node); + sve->handlers = handlers; + sve->vlan_id = vlan_id; + sve->pde = pde; + list_add(&sve->node, &switch_dev->vlan_dirs); + + return 0; + +fail: + if (sve) { + kfree(sve); + } + + if (pde) { + /* + * Remove any proc entries we might have created + */ + while (handlers->name) { + remove_proc_entry(handlers->name, pde); + handlers++; + } + + remove_proc_entry(s, switch_dev->driver_dir); + } + + return -ENOMEM; +} + +/* + * switch_register_proc_nodes + */ +int switch_register_proc_nodes(struct switch_device *switch_dev) +{ + int i; + int n; + + switch_dev->port_dirs = kzalloc(switch_dev->ports * + sizeof(struct proc_dir_entry *), + GFP_KERNEL); + if (!switch_dev->port_dirs) { + return -ENOMEM; + } + + /* + * Create a new proc entry for this switch + */ + switch_dev->driver_dir = proc_mkdir(switch_dev->name, switch_root); + if (!switch_dev->driver_dir) { + goto fail; + } + if (switch_dev->driver_handlers) { + switch_add_handlers(switch_dev, + switch_dev->driver_dir, + switch_dev->driver_handlers, + 0); + } + + /* + * Create the ports + */ + switch_dev->port_dir = proc_mkdir("port", switch_dev->driver_dir); + if (!switch_dev->port_dir) { + goto fail; + } + for (n = 0, i = 0; i < (SWITCH_PORT_MASK_SIZE * 32); i++) { + if (switch_dev->port_mask[i / 32] & (1 << i % 32)) { + char s[14]; + + snprintf(s, 14, "%d", i); + switch_dev->port_dirs[n] = + proc_mkdir(s, switch_dev->port_dir); + if (!switch_dev->port_dirs[n]) { + goto fail; + } + if (switch_dev->port_handlers) { + switch_add_handlers(switch_dev, + switch_dev->port_dirs[n], + switch_dev->port_handlers, + i); + } + n++; + } + } + + /* + * Create the register directory for switch register access. + */ + if (switch_dev->reg_handlers) { + switch_dev->reg_dir = proc_mkdir("reg", switch_dev->driver_dir); + if (!switch_dev->reg_dir) { + goto fail; + } + + switch_add_handlers(switch_dev, + switch_dev->reg_dir, + switch_dev->reg_handlers, + 0); + } + + /* + * Create the vlan directory + */ + if (switch_dev->vlan_handlers) { + switch_dev->vlan_dir = proc_mkdir("vlan", + switch_dev->driver_dir); + if (!switch_dev->vlan_dir) { + goto fail; + } + if (switch_dev->vlan_handlers) { + switch_add_handlers(switch_dev, + switch_dev->vlan_dir, + switch_dev->vlan_handlers, + 0); + } + } + + return 0; + +fail: + switch_unregister_proc_nodes(switch_dev); + return -ENOMEM; +} + +/* + * switch_release + */ +void switch_release(struct switch_device *switch_dev) +{ + kfree(switch_dev); +} + +/* + * switch_alloc + */ +struct switch_device *switch_alloc(void) +{ + struct switch_device *switch_dev = + kzalloc(sizeof(struct switch_device), + GFP_KERNEL); + INIT_LIST_HEAD(&switch_dev->node); + INIT_LIST_HEAD(&switch_dev->vlan_dirs); + INIT_LIST_HEAD(&switch_dev->handlers); + return switch_dev; +} + +/* + * switch_register + */ +int switch_register(struct switch_device *switch_dev) +{ + int ret; + int i; + + /* + * Make sure that the number of ports and the port mask make sense + */ + for (ret = 0, i = 0; i < (SWITCH_PORT_MASK_SIZE * 32); i++) { + if (switch_dev->port_mask[i / 32] & (1 << i % 32)) { + ret++; + } + } + if (ret > switch_dev->ports) { + return -EINVAL; + } + + /* + * Create the /proc entries + */ + ret = switch_register_proc_nodes(switch_dev); + if (ret) { + return ret; + } + + /* + * Add it to the list of switches + */ + down_write(&switch_list_lock); + list_add_tail(&switch_dev->node, &switch_list); + up_write(&switch_list_lock); + + printk(KERN_INFO "Registered switch device: %s\n", switch_dev->name); + + return 0; +} +EXPORT_SYMBOL_GPL(switch_register); + +/* + * switch_unregister + * Unregisters a previously registered switch_device object + */ +void switch_unregister(struct switch_device *switch_dev) +{ + /* + * remove the proc entries + */ + switch_unregister_proc_nodes(switch_dev); + + /* + * Remove it from the list of switches + */ + down_write(&switch_list_lock); + list_del(&switch_dev->node); + up_write(&switch_list_lock); + + printk(KERN_INFO "Unregistered switch device: %s\n", switch_dev->name); +} +EXPORT_SYMBOL_GPL(switch_unregister); + +/* + * switch_init + */ +static int __init switch_init(void) +{ + switch_root = proc_mkdir("switch", NULL); + if (!switch_root) { + printk(KERN_WARNING "Failed to make root switch node\n"); + return -ENODEV; + } + return 0; +} +module_init(switch_init); + +/* + * switch_exit + */ +static void __exit switch_exit(void) +{ + remove_proc_entry("switch", NULL); +} +module_exit(switch_exit); + +MODULE_AUTHOR("Patrick Tjin"); +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("Ethernet Switch Class Interface"); |