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) 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) 76 return NULL; 77 snprintf(name, sizeof(name), "%x", ent->type); 78 return proc_mkdir_data(name, 0555, procdir, (void *)lanes); 79 } 80 81 /* The PDE private data for a file under /proc/bus/nubus/x/ is a pointer to 82 * an instance of the following structure, which gives the location and size 83 * of the resource data in the slot ROM. For slot resources which hold only a 84 * small integer, this integer value is stored directly and size is set to 0. 85 * A NULL private data pointer indicates an unrecognized resource. 86 */ 87 88 struct nubus_proc_pde_data { 89 unsigned char *res_ptr; 90 unsigned int res_size; 91 }; 92 93 static struct nubus_proc_pde_data * 94 nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) 95 { 96 struct nubus_proc_pde_data *pde_data; 97 98 pde_data = kmalloc(sizeof(*pde_data), GFP_KERNEL); 99 if (!pde_data) 100 return NULL; 101 102 pde_data->res_ptr = ptr; 103 pde_data->res_size = size; 104 return pde_data; 105 } 106 107 static int nubus_proc_rsrc_show(struct seq_file *m, void *v) 108 { 109 struct inode *inode = m->private; 110 struct nubus_proc_pde_data *pde_data; 111 112 pde_data = PDE_DATA(inode); 113 if (!pde_data) 114 return 0; 115 116 if (pde_data->res_size > m->size) 117 return -EFBIG; 118 119 if (pde_data->res_size) { 120 int lanes = (int)proc_get_parent_data(inode); 121 struct nubus_dirent ent; 122 123 if (!lanes) 124 return 0; 125 126 ent.mask = lanes; 127 ent.base = pde_data->res_ptr; 128 ent.data = 0; 129 nubus_seq_write_rsrc_mem(m, &ent, pde_data->res_size); 130 } else { 131 unsigned int data = (unsigned int)pde_data->res_ptr; 132 133 seq_putc(m, data >> 16); 134 seq_putc(m, data >> 8); 135 seq_putc(m, data >> 0); 136 } 137 return 0; 138 } 139 140 void nubus_proc_add_rsrc_mem(struct proc_dir_entry *procdir, 141 const struct nubus_dirent *ent, 142 unsigned int size) 143 { 144 char name[9]; 145 struct nubus_proc_pde_data *pde_data; 146 147 if (!procdir) 148 return; 149 150 snprintf(name, sizeof(name), "%x", ent->type); 151 if (size) 152 pde_data = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size); 153 else 154 pde_data = NULL; 155 proc_create_single_data(name, S_IFREG | 0444, procdir, 156 nubus_proc_rsrc_show, pde_data); 157 } 158 159 void nubus_proc_add_rsrc(struct proc_dir_entry *procdir, 160 const struct nubus_dirent *ent) 161 { 162 char name[9]; 163 unsigned char *data = (unsigned char *)ent->data; 164 165 if (!procdir) 166 return; 167 168 snprintf(name, sizeof(name), "%x", ent->type); 169 proc_create_single_data(name, S_IFREG | 0444, procdir, 170 nubus_proc_rsrc_show, 171 nubus_proc_alloc_pde_data(data, 0)); 172 } 173 174 /* 175 * /proc/nubus stuff 176 */ 177 178 void __init nubus_proc_init(void) 179 { 180 proc_create_single("nubus", 0, NULL, nubus_proc_show); 181 proc_bus_nubus_dir = proc_mkdir("bus/nubus", NULL); 182 if (!proc_bus_nubus_dir) 183 return; 184 proc_create_single("devices", 0, proc_bus_nubus_dir, 185 nubus_devices_proc_show); 186 } 187