diff options
Diffstat (limited to 'drivers/nubus/proc.c')
| -rw-r--r-- | drivers/nubus/proc.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/nubus/proc.c b/drivers/nubus/proc.c new file mode 100644 index 000000000..cd4bd06cf --- /dev/null +++ b/drivers/nubus/proc.c @@ -0,0 +1,198 @@ +// 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); +} |