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 struct proc_dir_entry *proc_bus_nubus_dir; 49 50 /* 51 * /proc/bus/nubus/x/ stuff 52 */ 53 54 struct proc_dir_entry *nubus_proc_add_board(struct nubus_board *board) 55 { 56 char name[2]; 57 58 if (!proc_bus_nubus_dir || !nubus_populate_procfs) 59 return NULL; 60 snprintf(name, sizeof(name), "%x", board->slot); 61 return proc_mkdir(name, proc_bus_nubus_dir); 62 } 63 64 /* The PDE private data for any directory under /proc/bus/nubus/x/ 65 * is the bytelanes value for the board in slot x. 66 */ 67 68 struct proc_dir_entry *nubus_proc_add_rsrc_dir(struct proc_dir_entry *procdir, 69 const struct nubus_dirent *ent, 70 struct nubus_board *board) 71 { 72 char name[9]; 73 int lanes = board->lanes; 74 75 if (!procdir || !nubus_populate_procfs) 76 return NULL; 77 snprintf(name, sizeof(name), "%x", ent->type); 78 remove_proc_subtree(name, procdir); 79 return proc_mkdir_data(name, 0555, procdir, (void *)lanes); 80 } 81 82 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to 83 * an instance of the following structure, which gives the location and size 84 * of the resource data in the slot ROM. For slot resources which hold only a 85 * small integer, this integer value is stored directly and size is set to 0. 86 * A NULL private data pointer indicates an unrecognized resource. 87 */ 88 89 struct nubus_proc_pde_data { 90 unsigned char *res_ptr; 91 unsigned int res_size; 92 }; 93 94 static struct nubus_proc_pde_data * 95 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) 96 { 97 struct nubus_proc_pde_data *pded; 98 99 pded = kmalloc(sizeof(*pded), GFP_KERNEL); 100 if (!pded) 101 return NULL; 102 103 pded->res_ptr = ptr; 104 pded->res_size = size; 105 return pded; 106 } 107 108 static int nubus_proc_rsrc_show(struct seq_file *m, void *v) 109 { 110 struct inode *inode = m->private; 111 struct nubus_proc_pde_data *pded; 112 113 pded = pde_data(inode); 114 if (!pded) 115 return 0; 116 117 if (pded->res_size > m->size) 118 return -EFBIG; 119 120 if (pded->res_size) { 121 int lanes = (int)proc_get_parent_data(inode); 122 struct nubus_dirent ent; 123 124 if (!lanes) 125 return 0; 126 127 ent.mask = lanes; 128 ent.base = pded->res_ptr; 129 ent.data = 0; 130 nubus_seq_write_rsrc_mem(m, &ent, pded->res_size); 131 } else { 132 unsigned int data = (unsigned int)pded->res_ptr; 133 134 seq_putc(m, data >> 16); 135 seq_putc(m, data >> 8); 136 seq_putc(m, data >> 0); 137 } 138 return 0; 139 } 140 141 static int nubus_rsrc_proc_open(struct inode *inode, struct file *file) 142 { 143 return single_open(file, nubus_proc_rsrc_show, inode); 144 } 145 146 static const struct proc_ops nubus_rsrc_proc_ops = { 147 .proc_open = nubus_rsrc_proc_open, 148 .proc_read = seq_read, 149 .proc_lseek = seq_lseek, 150 .proc_release = single_release, 151 }; 152 153 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir, 154 const struct nubus_dirent *ent, 155 unsigned int size) 156 { 157 char name[9]; 158 struct nubus_proc_pde_data *pded; 159 160 if (!procdir || !nubus_populate_procfs) 161 return; 162 163 snprintf(name, sizeof(name), "%x", ent->type); 164 if (size) 165 pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size); 166 else 167 pded = NULL; 168 remove_proc_subtree(name, procdir); 169 proc_create_data(name, S_IFREG | 0444, procdir, 170 &nubus_rsrc_proc_ops, pded); 171 } 172 173 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir, 174 const struct nubus_dirent *ent) 175 { 176 char name[9]; 177 unsigned char *data = (unsigned char *)ent->data; 178 179 if (!procdir || !nubus_populate_procfs) 180 return; 181 182 snprintf(name, sizeof(name), "%x", ent->type); 183 remove_proc_subtree(name, procdir); 184 proc_create_data(name, S_IFREG | 0444, procdir, 185 &nubus_rsrc_proc_ops, 186 nubus_proc_alloc_pde_data(data, 0)); 187 } 188 189 /* 190 * /proc/nubus stuff 191 */ 192 193 void __init nubus_proc_init(void) 194 { 195 proc_create_single("nubus", 0, NULL, nubus_proc_show); 196 proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL); 197 if (!proc_bus_nubus_dir) 198 return; 199 proc_create_single("devices", 0, proc_bus_nubus_dir, 200 nubus_devices_proc_show); 201 } 202