| // SPDX-License-Identifier: GPL-2.0 |
| /* drivers/nubus/proc.c: Proc FS interface for NuBus. |
| |
| By David Huggins-Daines <dhd@debian.org> |
| |
| Much code and many ideas from drivers/pci/proc.c: |
| Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> |
| |
| This is initially based on the Zorro and PCI interfaces. However, |
| it works somewhat differently. The intent is to provide a |
| structure in /proc analogous to the structure of the NuBus ROM |
| resources. |
| |
| Therefore each board function gets a directory, which may in turn |
| contain subdirectories. Each slot resource is a file. Unrecognized |
| resources are empty files, since every resource ID requires a special |
| case (e.g. if the resource ID implies a directory or block, then its |
| value has to be interpreted as a slot ROM pointer etc.). |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/kernel.h> |
| #include <linux/nubus.h> |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include <linux/slab.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/uaccess.h> |
| #include <asm/byteorder.h> |
| |
| /* |
| * /proc/bus/nubus/devices stuff |
| */ |
| |
| static int |
| nubus_devices_proc_show(struct seq_file *m, void *v) |
| { |
| struct nubus_rsrc *fres; |
| |
| for_each_func_rsrc(fres) |
| seq_printf(m, "%x\t%04x %04x %04x %04x\t%08lx\n", |
| fres->board->slot, fres->category, fres->type, |
| fres->dr_sw, fres->dr_hw, fres->board->slot_addr); |
| return 0; |
| } |
| |
| static struct proc_dir_entry *proc_bus_nubus_dir; |
| |
| /* |
| * /proc/bus/nubus/x/ stuff |
| */ |
| |
| struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board) |
| { |
| char name[2]; |
| |
| if (!proc_bus_nubus_dir) |
| return NULL; |
| snprintf(name, sizeof(name), "%x", board->slot); |
| return proc_mkdir(name, proc_bus_nubus_dir); |
| } |
| |
| /* The PDE private data for any directory under /proc/bus/nubus/x/ |
| * is the bytelanes value for the board in slot x. |
| */ |
| |
| struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir, |
| const struct nubus_dirent *ent, |
| struct nubus_board *board) |
| { |
| char name[9]; |
| int lanes = board->lanes; |
| |
| if (!procdir) |
| return NULL; |
| snprintf(name, sizeof(name), "%x", ent->type); |
| return proc_mkdir_data(name, 0555, procdir, (void *)lanes); |
| } |
| |
| /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to |
| * an instance of the following structure, which gives the location and size |
| * of the resource data in the slot ROM. For slot resources which hold only a |
| * small integer, this integer value is stored directly and size is set to 0. |
| * A NULL private data pointer indicates an unrecognized resource. |
| */ |
| |
| struct nubus_proc_pde_data { |
| unsigned char *res_ptr; |
| unsigned int res_size; |
| }; |
| |
| static struct nubus_proc_pde_data * |
| nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) |
| { |
| struct nubus_proc_pde_data *pded; |
| |
| pded = kmalloc(sizeof(*pded), GFP_KERNEL); |
| if (!pded) |
| return NULL; |
| |
| pded->res_ptr = ptr; |
| pded->res_size = size; |
| return pded; |
| } |
| |
| static int nubus_proc_rsrc_show(struct seq_file *m, void *v) |
| { |
| struct inode *inode = m->private; |
| struct nubus_proc_pde_data *pded; |
| |
| pded = pde_data(inode); |
| if (!pded) |
| return 0; |
| |
| if (pded->res_size > m->size) |
| return -EFBIG; |
| |
| if (pded->res_size) { |
| int lanes = (int)proc_get_parent_data(inode); |
| struct nubus_dirent ent; |
| |
| if (!lanes) |
| return 0; |
| |
| ent.mask = lanes; |
| ent.base = pded->res_ptr; |
| ent.data = 0; |
| nubus_seq_write_rsrc_mem(m, &ent, pded->res_size); |
| } else { |
| unsigned int data = (unsigned int)pded->res_ptr; |
| |
| seq_putc(m, data >> 16); |
| seq_putc(m, data >> 8); |
| seq_putc(m, data >> 0); |
| } |
| return 0; |
| } |
| |
| static int nubus_rsrc_proc_open(struct inode *inode, struct file *file) |
| { |
| return single_open(file, nubus_proc_rsrc_show, inode); |
| } |
| |
| static const struct proc_ops nubus_rsrc_proc_ops = { |
| .proc_open = nubus_rsrc_proc_open, |
| .proc_read = seq_read, |
| .proc_lseek = seq_lseek, |
| .proc_release = single_release, |
| }; |
| |
| void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir, |
| const struct nubus_dirent *ent, |
| unsigned int size) |
| { |
| char name[9]; |
| struct nubus_proc_pde_data *pded; |
| |
| if (!procdir) |
| return; |
| |
| snprintf(name, sizeof(name), "%x", ent->type); |
| if (size) |
| pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size); |
| else |
| pded = NULL; |
| proc_create_data(name, S_IFREG | 0444, procdir, |
| &nubus_rsrc_proc_ops, pded); |
| } |
| |
| void nubus_proc_add_rsrc(struct proc_dir_entry *procdir, |
| const struct nubus_dirent *ent) |
| { |
| char name[9]; |
| unsigned char *data = (unsigned char *)ent->data; |
| |
| if (!procdir) |
| return; |
| |
| snprintf(name, sizeof(name), "%x", ent->type); |
| proc_create_data(name, S_IFREG | 0444, procdir, |
| &nubus_rsrc_proc_ops, |
| nubus_proc_alloc_pde_data(data, 0)); |
| } |
| |
| /* |
| * /proc/nubus stuff |
| */ |
| |
| void __init nubus_proc_init(void) |
| { |
| proc_create_single("nubus", 0, NULL, nubus_proc_show); |
| proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL); |
| if (!proc_bus_nubus_dir) |
| return; |
| proc_create_single("devices", 0, proc_bus_nubus_dir, |
| nubus_devices_proc_show); |
| } |