Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
285
drivers/mtd/devices/phram.c
Normal file
285
drivers/mtd/devices/phram.c
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/**
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* $Id: phram.c,v 1.11 2005/01/05 18:05:13 dwmw2 Exp $
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*
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* Copyright (c) ???? Jochen Sch<63>uble <psionic@psionic.de>
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* Copyright (c) 2003-2004 J<>rn Engel <joern@wh.fh-wedel.de>
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*
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* Usage:
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*
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* one commend line parameter per device, each in the form:
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* phram=<name>,<start>,<len>
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* <name> may be up to 63 characters.
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* <start> and <len> can be octal, decimal or hexadecimal. If followed
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* by "ki", "Mi" or "Gi", the numbers will be interpreted as kilo, mega or
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* gigabytes.
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*
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* Example:
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* phram=swap,64Mi,128Mi phram=test,900Mi,1Mi
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*
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*/
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#include <asm/io.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/mtd/mtd.h>
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#define ERROR(fmt, args...) printk(KERN_ERR "phram: " fmt , ## args)
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struct phram_mtd_list {
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struct mtd_info mtd;
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struct list_head list;
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};
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static LIST_HEAD(phram_list);
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static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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u_char *start = mtd->priv;
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if (instr->addr + instr->len > mtd->size)
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return -EINVAL;
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memset(start + instr->addr, 0xff, instr->len);
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/* This'll catch a few races. Free the thing before returning :)
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* I don't feel at all ashamed. This kind of thing is possible anyway
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* with flash, but unlikely.
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*/
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instr->state = MTD_ERASE_DONE;
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mtd_erase_callback(instr);
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return 0;
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}
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static int phram_point(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char **mtdbuf)
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{
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u_char *start = mtd->priv;
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if (from + len > mtd->size)
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return -EINVAL;
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*mtdbuf = start + from;
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*retlen = len;
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return 0;
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}
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static void phram_unpoint(struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
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{
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}
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static int phram_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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u_char *start = mtd->priv;
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if (from + len > mtd->size)
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return -EINVAL;
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memcpy(buf, start + from, len);
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*retlen = len;
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return 0;
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}
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static int phram_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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u_char *start = mtd->priv;
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if (to + len > mtd->size)
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return -EINVAL;
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memcpy(start + to, buf, len);
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*retlen = len;
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return 0;
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}
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static void unregister_devices(void)
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{
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struct phram_mtd_list *this;
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list_for_each_entry(this, &phram_list, list) {
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del_mtd_device(&this->mtd);
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iounmap(this->mtd.priv);
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kfree(this);
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}
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}
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static int register_device(char *name, unsigned long start, unsigned long len)
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{
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struct phram_mtd_list *new;
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int ret = -ENOMEM;
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new = kmalloc(sizeof(*new), GFP_KERNEL);
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if (!new)
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goto out0;
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memset(new, 0, sizeof(*new));
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ret = -EIO;
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new->mtd.priv = ioremap(start, len);
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if (!new->mtd.priv) {
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ERROR("ioremap failed\n");
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goto out1;
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}
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new->mtd.name = name;
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new->mtd.size = len;
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new->mtd.flags = MTD_CAP_RAM | MTD_ERASEABLE | MTD_VOLATILE;
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new->mtd.erase = phram_erase;
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new->mtd.point = phram_point;
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new->mtd.unpoint = phram_unpoint;
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new->mtd.read = phram_read;
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new->mtd.write = phram_write;
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new->mtd.owner = THIS_MODULE;
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new->mtd.type = MTD_RAM;
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new->mtd.erasesize = 0;
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ret = -EAGAIN;
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if (add_mtd_device(&new->mtd)) {
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ERROR("Failed to register new device\n");
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goto out2;
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}
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list_add_tail(&new->list, &phram_list);
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return 0;
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out2:
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iounmap(new->mtd.priv);
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out1:
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kfree(new);
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out0:
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return ret;
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}
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static int ustrtoul(const char *cp, char **endp, unsigned int base)
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{
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unsigned long result = simple_strtoul(cp, endp, base);
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switch (**endp) {
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case 'G':
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result *= 1024;
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case 'M':
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result *= 1024;
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case 'k':
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result *= 1024;
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/* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */
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if ((*endp)[1] == 'i')
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(*endp) += 2;
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}
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return result;
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}
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static int parse_num32(uint32_t *num32, const char *token)
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{
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char *endp;
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unsigned long n;
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n = ustrtoul(token, &endp, 0);
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if (*endp)
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return -EINVAL;
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*num32 = n;
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return 0;
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}
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static int parse_name(char **pname, const char *token)
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{
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size_t len;
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char *name;
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len = strlen(token) + 1;
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if (len > 64)
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return -ENOSPC;
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name = kmalloc(len, GFP_KERNEL);
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if (!name)
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return -ENOMEM;
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strcpy(name, token);
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*pname = name;
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return 0;
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}
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#define parse_err(fmt, args...) do { \
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ERROR(fmt , ## args); \
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return 0; \
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} while (0)
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static int phram_setup(const char *val, struct kernel_param *kp)
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{
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char buf[64+12+12], *str = buf;
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char *token[3];
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char *name;
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uint32_t start;
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uint32_t len;
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int i, ret;
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if (strnlen(val, sizeof(buf)) >= sizeof(buf))
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parse_err("parameter too long\n");
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strcpy(str, val);
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for (i=0; i<3; i++)
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token[i] = strsep(&str, ",");
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if (str)
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parse_err("too many arguments\n");
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if (!token[2])
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parse_err("not enough arguments\n");
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ret = parse_name(&name, token[0]);
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if (ret == -ENOMEM)
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parse_err("out of memory\n");
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if (ret == -ENOSPC)
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parse_err("name too long\n");
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if (ret)
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return 0;
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ret = parse_num32(&start, token[1]);
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if (ret)
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parse_err("illegal start address\n");
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ret = parse_num32(&len, token[2]);
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if (ret)
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parse_err("illegal device length\n");
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register_device(name, start, len);
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return 0;
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}
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module_param_call(phram, phram_setup, NULL, NULL, 000);
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MODULE_PARM_DESC(phram,"Memory region to map. \"map=<name>,<start>,<length>\"");
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static int __init init_phram(void)
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{
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return 0;
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}
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static void __exit cleanup_phram(void)
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{
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unregister_devices();
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}
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module_init(init_phram);
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module_exit(cleanup_phram);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("J<EFBFBD>rn Engel <joern@wh.fh-wedel.de>");
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MODULE_DESCRIPTION("MTD driver for physical RAM");
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