proc.c (4675B)
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 36static int 37nubus_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 48static struct proc_dir_entry *proc_bus_nubus_dir; 49 50/* 51 * /proc/bus/nubus/x/ stuff 52 */ 53 54struct 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 68struct 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 88struct nubus_proc_pde_data { 89 unsigned char *res_ptr; 90 unsigned int res_size; 91}; 92 93static struct nubus_proc_pde_data * 94nubus_proc_alloc_pde_data(unsigned char *ptr, unsigned int size) 95{ 96 struct nubus_proc_pde_data *pded; 97 98 pded = kmalloc(sizeof(*pded), GFP_KERNEL); 99 if (!pded) 100 return NULL; 101 102 pded->res_ptr = ptr; 103 pded->res_size = size; 104 return pded; 105} 106 107static int nubus_proc_rsrc_show(struct seq_file *m, void *v) 108{ 109 struct inode *inode = m->private; 110 struct nubus_proc_pde_data *pded; 111 112 pded = pde_data(inode); 113 if (!pded) 114 return 0; 115 116 if (pded->res_size > m->size) 117 return -EFBIG; 118 119 if (pded->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 = pded->res_ptr; 128 ent.data = 0; 129 nubus_seq_write_rsrc_mem(m, &ent, pded->res_size); 130 } else { 131 unsigned int data = (unsigned int)pded->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 140void 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 *pded; 146 147 if (!procdir) 148 return; 149 150 snprintf(name, sizeof(name), "%x", ent->type); 151 if (size) 152 pded = nubus_proc_alloc_pde_data(nubus_dirptr(ent), size); 153 else 154 pded = NULL; 155 proc_create_single_data(name, S_IFREG | 0444, procdir, 156 nubus_proc_rsrc_show, pded); 157} 158 159void 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 178void __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}