Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * Copyright (c) ????		Jochen Schäuble <psionic@psionic.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (c) 2003-2004	Joern Engel <joern@wh.fh-wedel.de>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  * Usage:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  * one commend line parameter per device, each in the form:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  *   phram=<name>,<start>,<len>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * <name> may be up to 63 characters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * <start> and <len> can be octal, decimal or hexadecimal.  If followed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  * by "ki", "Mi" or "Gi", the numbers will be interpreted as kilo, mega or
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * gigabytes.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  * Example:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *	phram=swap,64Mi,128Mi phram=test,900Mi,1Mi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #include <linux/io.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <linux/list.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <linux/moduleparam.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <linux/mtd/mtd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) struct phram_mtd_list {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 	struct mtd_info mtd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	struct list_head list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) static LIST_HEAD(phram_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	u_char *start = mtd->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	memset(start + instr->addr, 0xff, instr->len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int phram_point(struct mtd_info *mtd, loff_t from, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 		size_t *retlen, void **virt, resource_size_t *phys)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	*virt = mtd->priv + from;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	*retlen = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) static int phram_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) static int phram_read(struct mtd_info *mtd, loff_t from, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		size_t *retlen, u_char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	u_char *start = mtd->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	memcpy(buf, start + from, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	*retlen = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) static int phram_write(struct mtd_info *mtd, loff_t to, size_t len,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 		size_t *retlen, const u_char *buf)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	u_char *start = mtd->priv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	memcpy(start + to, buf, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 	*retlen = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) static void unregister_devices(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 	struct phram_mtd_list *this, *safe;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 	list_for_each_entry_safe(this, safe, &phram_list, list) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 		mtd_device_unregister(&this->mtd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 		iounmap(this->mtd.priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 		kfree(this->mtd.name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 		kfree(this);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) static int register_device(char *name, phys_addr_t start, size_t len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	struct phram_mtd_list *new;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	int ret = -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	new = kzalloc(sizeof(*new), GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	if (!new)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		goto out0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	new->mtd.priv = ioremap(start, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) 	if (!new->mtd.priv) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) 		pr_err("ioremap failed\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 		goto out1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) 	new->mtd.name = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 	new->mtd.size = len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) 	new->mtd.flags = MTD_CAP_RAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 	new->mtd._erase = phram_erase;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) 	new->mtd._point = phram_point;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 	new->mtd._unpoint = phram_unpoint;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) 	new->mtd._read = phram_read;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	new->mtd._write = phram_write;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	new->mtd.owner = THIS_MODULE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	new->mtd.type = MTD_RAM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	new->mtd.erasesize = PAGE_SIZE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	new->mtd.writesize = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	ret = -EAGAIN;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	if (mtd_device_register(&new->mtd, NULL, 0)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 		pr_err("Failed to register new device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 		goto out2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	list_add_tail(&new->list, &phram_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) out2:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	iounmap(new->mtd.priv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) out1:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	kfree(new);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) out0:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) static int parse_num64(uint64_t *num64, char *token)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) 	size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	int shift = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	len = strlen(token);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	/* By dwmw2 editorial decree, "ki", "Mi" or "Gi" are to be used. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 	if (len > 2) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 		if (token[len - 1] == 'i') {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 			switch (token[len - 2]) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 			case 'G':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 				shift += 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 				fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 			case 'M':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 				shift += 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 				fallthrough;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 			case 'k':
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 				shift += 10;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 				token[len - 2] = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 				break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 			default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 				return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 			}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 	ret = kstrtou64(token, 0, num64);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 	*num64 <<= shift;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) static int parse_name(char **pname, const char *token)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	len = strlen(token) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	if (len > 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 		return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	name = kstrdup(token, GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	if (!name)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 		return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 	*pname = name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static inline void kill_final_newline(char *str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 	char *newline = strrchr(str, '\n');
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	if (newline && !newline[1])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) 		*newline = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) #define parse_err(fmt, args...) do {	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 	pr_err(fmt , ## args);	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) 	return 1;		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) } while (0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) #ifndef MODULE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) static int phram_init_called;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206)  * This shall contain the module parameter if any. It is of the form:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207)  * - phram=<device>,<address>,<size> for module case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)  * - phram.phram=<device>,<address>,<size> for built-in case
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209)  * We leave 64 bytes for the device name, 20 for the address and 20 for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210)  * size.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211)  * Example: phram.phram=rootfs,0xa0000000,512Mi
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) static char phram_paramline[64 + 20 + 20];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) static int phram_setup(const char *val)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	char buf[64 + 20 + 20], *str = buf;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	char *token[3];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) 	char *name;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 	uint64_t start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) 	uint64_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) 	int i, ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 	if (strnlen(val, sizeof(buf)) >= sizeof(buf))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) 		parse_err("parameter too long\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 	strcpy(str, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) 	kill_final_newline(str);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) 	for (i = 0; i < 3; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) 		token[i] = strsep(&str, ",");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 	if (str)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) 		parse_err("too many arguments\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) 	if (!token[2])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) 		parse_err("not enough arguments\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) 	ret = parse_name(&name, token[0]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 	ret = parse_num64(&start, token[1]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		parse_err("illegal start address\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) 	ret = parse_num64(&len, token[2]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	if (ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 		parse_err("illegal device length\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) 	ret = register_device(name, start, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 	if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) 		goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) 	pr_info("%s device: %#llx at %#llx\n", name, len, start);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	kfree(name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) static int phram_param_call(const char *val, const struct kernel_param *kp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) #ifdef MODULE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271) 	return phram_setup(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) #else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) 	 * If more parameters are later passed in via
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) 	 * /sys/module/phram/parameters/phram
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) 	 * and init_phram() has already been called,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) 	 * we can parse the argument now.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) 	if (phram_init_called)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) 		return phram_setup(val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) 	 * During early boot stage, we only save the parameters
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) 	 * here. We must parse them later: if the param passed
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) 	 * from kernel boot command line, phram_param_call() is
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) 	 * called so early that it is not possible to resolve
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) 	 * the device (even kmalloc() fails). Defer that work to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) 	 * phram_setup().
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 	if (strlen(val) >= sizeof(phram_paramline))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 		return -ENOSPC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 	strcpy(phram_paramline, val);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) module_param_call(phram, phram_param_call, NULL, NULL, 0200);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) MODULE_PARM_DESC(phram, "Memory region to map. \"phram=<name>,<start>,<length>\"");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) static int __init init_phram(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) #ifndef MODULE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 	if (phram_paramline[0])
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 		ret = phram_setup(phram_paramline);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) 	phram_init_called = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) static void __exit cleanup_phram(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 	unregister_devices();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) module_init(init_phram);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) module_exit(cleanup_phram);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) MODULE_LICENSE("GPL");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) MODULE_AUTHOR("Joern Engel <joern@wh.fh-wedel.de>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) MODULE_DESCRIPTION("MTD driver for physical RAM");