1 // SPDX-License-Identifier: GPL-2.0 2 /* drivers/nubus/proc.c: Proc FS interface for NuBus. 3 4 By David Huggins-Daines <dhd@debian.org> 5 6 Much code and many ideas from drivers/pci/proc.c: 7 Copyright (c) 1997, 1998 Martin Mares <mj@atrey.karlin.mff.cuni.cz> 8 9 This is initially based on the Zorro and PCI interfaces. However, 10 it works somewhat differently. The intent is to provide a 11 structure in /proc analogous to the structure of the NuBus ROM 12 resources. 13 14 Therefore each board function gets a directory, which may in turn 15 contain subdirectories. Each slot resource is a file. Unrecognized 16 resources are empty files, since every resource ID requires a special 17 case (e.g. if the resource ID implies a directory or block, then its 18 value has to be interpreted as a slot ROM pointer etc.). 19 */ 20 21 #include <linux/types.h> 22 #include <linux/kernel.h> 23 #include <linux/nubus.h> 24 #include <linux/proc_fs.h> 25 #include <linux/seq_file.h> 26 #include <linux/slab.h> 27 #include <linux/init.h> 28 #include <linux/module.h> 29 #include <linux/uaccess.h> 30 #include <asm/byteorder.h> 31 32 /* 33 * /proc/bus/nubus/devices stuff 34 */ 35 36 static int 37 nubus_devices_proc_show(struct seq_file *m, void *v) 38 { 39 struct nubus_rsrc *fres; 40 41 for_each_func_rsrc(fres) 42 seq_printf(m, "%x\t%04x %04x %04x %04x\t%08lx\n", 43 fres->board->slot, fres->category, fres->type, 44 fres->dr_sw, fres->dr_hw, fres->board->slot_addr); 45 return 0; 46 } 47 48 static int nubus_devices_proc_open(struct inode *inode, struct file *file) 49 { 50 return single_open(file, nubus_devices_proc_show, NULL); 51 } 52 53 static const struct file_operations nubus_devices_proc_fops = { 54 .open = nubus_devices_proc_open, 55 .read = seq_read, 56 .llseek = seq_lseek, 57 .release = single_release, 58 }; 59 60 static struct proc_dir_entry *proc_bus_nubus_dir; 61 62 /* 63 * /proc/bus/nubus/x/ stuff 64 */ 65 66 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board) 67 { 68 char name[2]; 69 70 if (!proc_bus_nubus_dir) 71 return NULL; 72 snprintf(name, sizeof(name), "%x", board->slot); 73 return proc_mkdir(name, proc_bus_nubus_dir); 74 } 75 76 /* The PDE private data for any directory under /proc/bus/nubus/x/ 77 * is the bytelanes value for the board in slot x. 78 */ 79 80 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir, 81 const struct nubus_dirent *ent, 82 struct nubus_board *board) 83 { 84 char name[9]; 85 int lanes = board->lanes; 86 87 if (!procdir) 88 return NULL; 89 snprintf(name, sizeof(name), "%x", ent->type); 90 return proc_mkdir_data(name, 0555, procdir, (void *)lanes); 91 } 92 93 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to 94 * an instance of the following structure, which gives the location and size 95 * of the resource data in the slot ROM. For slot resources which hold only a 96 * small integer, this integer value is stored directly and size is set to 0. 97 * A NULL private data pointer indicates an unrecognized resource. 98 */ 99 100 struct nubus_proc_pde_data { 101 unsigned char *res_ptr; 102 unsigned int res_size; 103 }; 104 105 static struct nubus_proc_pde_data * 106 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) 107 { 108 struct nubus_proc_pde_data *pde_data; 109 110 pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL); 111 if (!pde_data) 112 return NULL; 113 114 pde_data->res_ptr = ptr; 115 pde_data->res_size = size; 116 return pde_data; 117 } 118 119 static int nubus_proc_rsrc_show(struct seq_file *m, void *v) 120 { 121 struct inode *inode = m->private; 122 struct nubus_proc_pde_data *pde_data; 123 124 pde_data = PDE_DATA(inode); 125 if (!pde_data) 126 return 0; 127 128 if (pde_data->res_size > m->size) 129 return -EFBIG; 130 131 if (pde_data->res_size) { 132 int lanes = (int)proc_get_parent_data(inode); 133 struct nubus_dirent ent; 134 135 if (!lanes) 136 return 0; 137 138 ent.mask = lanes; 139 ent.base = pde_data->res_ptr; 140 ent.data = 0; 141 nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size); 142 } else { 143 unsigned int data = (unsigned int)pde_data->res_ptr; 144 145 seq_putc(m, data >> 16); 146 seq_putc(m, data >> 8); 147 seq_putc(m, data >> 0); 148 } 149 return 0; 150 } 151 152 static int nubus_proc_rsrc_open(struct inode *inode, struct file *file) 153 { 154 return single_open(file, nubus_proc_rsrc_show, inode); 155 } 156 157 static const struct file_operations nubus_proc_rsrc_fops = { 158 .open = nubus_proc_rsrc_open, 159 .read = seq_read, 160 .llseek = seq_lseek, 161 .release = single_release, 162 }; 163 164 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir, 165 const struct nubus_dirent *ent, 166 unsigned int size) 167 { 168 char name[9]; 169 struct nubus_proc_pde_data *pde_data; 170 171 if (!procdir) 172 return; 173 174 snprintf(name, sizeof(name), "%x", ent->type); 175 if (size) 176 pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size); 177 else 178 pde_data = NULL; 179 proc_create_data(name, S_IFREG | 0444, procdir, 180 &nubus_proc_rsrc_fops, pde_data); 181 } 182 183 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir, 184 const struct nubus_dirent *ent) 185 { 186 char name[9]; 187 unsigned char *data = (unsigned char *)ent->data; 188 189 if (!procdir) 190 return; 191 192 snprintf(name, sizeof(name), "%x", ent->type); 193 proc_create_data(name, S_IFREG | 0444, procdir, 194 &nubus_proc_rsrc_fops, 195 nubus_proc_alloc_pde_data(data, 0)); 196 } 197 198 /* 199 * /proc/nubus stuff 200 */ 201 202 static int nubus_proc_open(struct inode *inode, struct file *file) 203 { 204 return single_open(file, nubus_proc_show, NULL); 205 } 206 207 static const struct file_operations nubus_proc_fops = { 208 .open = nubus_proc_open, 209 .read = seq_read, 210 .llseek = seq_lseek, 211 .release = single_release, 212 }; 213 214 void __init nubus_proc_init(void) 215 { 216 proc_create("nubus", 0, NULL, &nubus_proc_fops); 217 proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL); 218 if (!proc_bus_nubus_dir) 219 return; 220 proc_create("devices", 0, proc_bus_nubus_dir, &nubus_devices_proc_fops); 221 } 222