2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
16 * This driver was originally based on the INCA-IP driver, but due to
17 * fundamental conceptual drawbacks there has been changed a lot.
19 * Based on INCA-IP driver Copyright(c) 2003 Gary Jennejohn <gj@denx.de>
20 * Based on the VxWorks drivers Copyright(c) 2002, Infineon Technologies.
22 * Copyright(C) 2006 infineon
23 * Copyright(C) 2007 John Crispin <blogic@openwrt.org>
27 #define IFAP_EEPROM_DRV_VERSION "0.0.1"
29 #include <linux/module.h>
30 #include <linux/errno.h>
31 #include <linux/signal.h>
32 #include <linux/sched.h>
33 #include <linux/timer.h>
34 #include <linux/interrupt.h>
35 #include <linux/major.h>
36 #include <linux/string.h>
38 #include <linux/fcntl.h>
39 #include <linux/ptrace.h>
41 #include <linux/ioport.h>
42 #include <linux/init.h>
43 #include <linux/delay.h>
44 #include <linux/spinlock.h>
45 #include <linux/slab.h>
47 #include <linux/irq.h>
48 #include <linux/uaccess.h>
49 #include <linux/bitops.h>
51 #include <linux/types.h>
52 #include <linux/kernel.h>
53 #include <linux/version.h>
55 #include <asm/system.h>
56 #include <asm/ifxmips/ifxmips.h>
57 #include <asm/ifxmips/ifxmips_irq.h>
58 #include <asm/ifxmips/ifx_ssc_defines.h>
59 #include <asm/ifxmips/ifx_ssc.h>
61 /* allow the user to set the major device number */
62 static int ifxmips_eeprom_maj;
64 extern int ifx_ssc_init(void);
65 extern int ifx_ssc_open(struct inode *inode, struct file *filp);
66 extern int ifx_ssc_close(struct inode *inode, struct file *filp);
67 extern void ifx_ssc_cleanup_module(void);
68 extern int ifx_ssc_ioctl(struct inode *inode, struct file *filp,
69 unsigned int cmd, unsigned long data);
70 extern ssize_t ifx_ssc_kwrite(int port, const char *kbuf, size_t len);
71 extern ssize_t ifx_ssc_kread(int port, char *kbuf, size_t len);
73 extern int ifx_ssc_cs_low(unsigned int pin);
74 extern int ifx_ssc_cs_high(unsigned int pin);
75 extern int ifx_ssc_txrx(char *tx_buf, unsigned int tx_len, char *rx_buf, unsigned int rx_len);
76 extern int ifx_ssc_tx(char *tx_buf, unsigned int tx_len);
77 extern int ifx_ssc_rx(char *rx_buf, unsigned int rx_len);
79 #define EEPROM_CS IFX_SSC_WHBGPOSTAT_OUT0_POS
81 /* commands for EEPROM, x25160, x25140 */
82 #define EEPROM_WREN ((unsigned char)0x06)
83 #define EEPROM_WRDI ((unsigned char)0x04)
84 #define EEPROM_RDSR ((unsigned char)0x05)
85 #define EEPROM_WRSR ((unsigned char)0x01)
86 #define EEPROM_READ ((unsigned char)0x03)
87 #define EEPROM_WRITE ((unsigned char)0x02)
88 #define EEPROM_PAGE_SIZE 4
89 #define EEPROM_SIZE 512
91 static int eeprom_rdsr(void)
94 unsigned char cmd = EEPROM_RDSR;
100 if ((ret = ifx_ssc_cs_low(EEPROM_CS)) == 0)
101 if ((ret = ifx_ssc_txrx(&cmd, 1, &status, 1)) >= 0)
104 ifx_ssc_cs_high(EEPROM_CS);
105 local_irq_restore(flag);
110 void eeprom_wip_over(void)
112 while (eeprom_rdsr())
113 printk(KERN_INFO "waiting for eeprom\n");
116 static int eeprom_wren(void)
118 unsigned char cmd = EEPROM_WREN;
122 local_irq_save(flag);
123 if ((ret = ifx_ssc_cs_low(EEPROM_CS)) == 0)
124 if ((ret = ifx_ssc_tx(&cmd, 1)) >= 0)
127 ifx_ssc_cs_high(EEPROM_CS);
128 local_irq_restore(flag);
136 static int eeprom_wrsr(void)
139 unsigned char cmd[2];
142 cmd[0] = EEPROM_WRSR;
145 if ((ret = eeprom_wren())) {
146 printk(KERN_ERR "eeprom_wren fails\n");
150 local_irq_save(flag);
152 if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
155 if ((ret = ifx_ssc_tx(cmd, 2)) < 0) {
156 ifx_ssc_cs_high(EEPROM_CS);
160 if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
163 local_irq_restore(flag);
169 local_irq_restore(flag);
176 static int eeprom_read(unsigned int addr, unsigned char *buf, unsigned int len)
179 unsigned char write_buf[2];
180 unsigned int eff = 0;
185 eff = EEPROM_PAGE_SIZE - (addr % EEPROM_PAGE_SIZE);
186 eff = (eff < len) ? eff : len;
187 local_irq_save(flag);
189 if ((ret = ifx_ssc_cs_low(EEPROM_CS)) < 0)
192 write_buf[0] = EEPROM_READ | ((unsigned char)((addr & 0x100) >> 5));
193 write_buf[1] = (addr & 0xff);
195 ret = ifx_ssc_txrx(write_buf, 2, buf, eff);
197 printk(KERN_ERR "ssc_txrx fails %d\n", ret);
198 ifx_ssc_cs_high(EEPROM_CS);
206 ret = ifx_ssc_cs_high(EEPROM_CS);
210 local_irq_restore(flag);
217 local_irq_restore(flag);
222 static int eeprom_write(unsigned int addr, unsigned char *buf, unsigned int len)
225 unsigned int eff = 0;
226 unsigned char write_buf[2];
228 unsigned char rx_buf[EEPROM_PAGE_SIZE];
233 if ((ret = eeprom_wren())) {
234 printk(KERN_ERR "eeprom_wren fails\n");
238 write_buf[0] = EEPROM_WRITE | ((unsigned char)((addr & 0x100) >> 5));
239 write_buf[1] = (addr & 0xff);
241 eff = EEPROM_PAGE_SIZE - (addr % EEPROM_PAGE_SIZE);
242 eff = (eff < len) ? eff : len;
244 printk(KERN_INFO "EEPROM Write:\n");
245 for (i = 0; i < eff; i++) {
246 printk("%2x ", buf[i]);
252 if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
255 if ((ret = ifx_ssc_tx(write_buf, 2)) < 0) {
256 printk(KERN_ERR "ssc_tx fails %d\n", ret);
257 ifx_ssc_cs_high(EEPROM_CS);
261 if ((ret = ifx_ssc_tx(buf, eff)) != eff) {
262 printk(KERN_ERR "ssc_tx fails %d\n", ret);
263 ifx_ssc_cs_high(EEPROM_CS);
271 if ((ret = ifx_ssc_cs_high(EEPROM_CS)))
274 printk(KERN_INFO "<==");
275 eeprom_read((addr - eff), rx_buf, eff);
276 for (i = 0; i < eff; i++)
277 printk("[%x]", rx_buf[i]);
288 int ifxmips_eeprom_open(struct inode *inode, struct file *filp)
294 int ifxmips_eeprom_close(struct inode *inode, struct file *filp)
299 int ifxmips_eeprom_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
304 ssize_t ifxmips_eeprom_read(char *buf, size_t len, unsigned int addr)
309 printk(KERN_INFO "addr:=%d\n", addr);
310 printk(KERN_INFO "len:=%d\n", len);
312 if ((addr + len) > EEPROM_SIZE) {
313 printk(KERN_ERR "invalid len\n");
315 len = EEPROM_SIZE / 2;
318 if ((ret = ifx_ssc_open((struct inode *)0, NULL))) {
319 printk(KERN_ERR "ifxmips_ssc_open fails\n");
323 data = (unsigned int)IFX_SSC_MODE_RXTX;
325 if ((ret = ifx_ssc_ioctl((struct inode *)0, NULL, IFX_SSC_RXTX_MODE_SET, (unsigned long) &data))) {
326 printk(KERN_ERR "set RXTX mode fails\n");
330 if ((ret = eeprom_wrsr())) {
331 printk(KERN_ERR "EEPROM reset fails\n");
335 if ((ret = eeprom_read(addr, buf, len))) {
336 printk(KERN_ERR "eeprom read fails\n");
341 if (ifx_ssc_close((struct inode *)0, NULL))
342 printk(KERN_ERR "ifxmips_ssc_close fails\n");
346 EXPORT_SYMBOL(ifxmips_eeprom_read);
348 static ssize_t ifxmips_eeprom_fops_read(struct file *filp, char *ubuf, size_t len, loff_t *off)
351 unsigned char ssc_rx_buf[EEPROM_SIZE];
354 if (*off >= EEPROM_SIZE)
357 if (*off + len > EEPROM_SIZE)
358 len = EEPROM_SIZE - *off;
363 local_irq_save(flag);
365 if ((ret = ifxmips_eeprom_read(ssc_rx_buf, len, *off)) < 0) {
366 printk(KERN_ERR "read fails, err=%x\n", ret);
367 local_irq_restore(flag);
371 if (copy_to_user((void *)ubuf, ssc_rx_buf, ret) != 0) {
372 local_irq_restore(flag);
376 local_irq_restore(flag);
382 ssize_t ifxmips_eeprom_write(char *buf, size_t len, unsigned int addr)
387 if ((ret = ifx_ssc_open((struct inode *)0, NULL))) {
388 printk(KERN_ERR "ifxmips_ssc_open fails\n");
392 data = (unsigned int) IFX_SSC_MODE_RXTX;
394 if ((ret = ifx_ssc_ioctl((struct inode *)0, NULL, IFX_SSC_RXTX_MODE_SET, (unsigned long) &data))) {
395 printk(KERN_ERR "set RXTX mode fails\n");
399 if ((ret = eeprom_wrsr())) {
400 printk(KERN_ERR "EEPROM reset fails\n");
404 if ((ret = eeprom_write(addr, buf, len))) {
405 printk(KERN_ERR "eeprom write fails\n");
410 if (ifx_ssc_close((struct inode *)0, NULL))
411 printk(KERN_ERR "ifxmips_ssc_close fails\n");
415 EXPORT_SYMBOL(ifxmips_eeprom_write);
417 static ssize_t ifxmips_eeprom_fops_write(struct file *filp, const char *ubuf, size_t len, loff_t *off)
420 unsigned char ssc_tx_buf[EEPROM_SIZE];
422 if (*off >= EEPROM_SIZE)
425 if (len + *off > EEPROM_SIZE)
426 len = EEPROM_SIZE - *off;
428 if ((ret = copy_from_user(ssc_tx_buf, ubuf, len)))
431 ret = ifxmips_eeprom_write(ssc_tx_buf, len, *off);
439 loff_t ifxmips_eeprom_llseek(struct file *filp, loff_t off, int whence)
448 newpos = filp->f_pos + off;
458 filp->f_pos = newpos;
463 static struct file_operations ifxmips_eeprom_fops = {
464 .owner = THIS_MODULE,
465 .llseek = ifxmips_eeprom_llseek,
466 .read = ifxmips_eeprom_fops_read,
467 .write = ifxmips_eeprom_fops_write,
468 .ioctl = ifxmips_eeprom_ioctl,
469 .open = ifxmips_eeprom_open,
470 .release = ifxmips_eeprom_close,
473 int __init ifxmips_eeprom_init(void)
477 ifxmips_eeprom_maj = register_chrdev(0, "eeprom", &ifxmips_eeprom_fops);
479 if (ifxmips_eeprom_maj < 0) {
480 printk(KERN_ERR "failed to register eeprom device\n");
486 printk(KERN_INFO "ifxmips_eeprom : /dev/eeprom mayor %d\n", ifxmips_eeprom_maj);
492 void __exit ifxmips_eeprom_cleanup_module(void)
494 /*if (unregister_chrdev(ifxmips_eeprom_maj, "eeprom")) {
495 printk(KERN_ERR "Unable to unregister major %d for the EEPROM\n",
500 module_exit(ifxmips_eeprom_cleanup_module);
501 module_init(ifxmips_eeprom_init);
503 MODULE_LICENSE("GPL");
504 MODULE_AUTHOR("Peng Liu");
505 MODULE_DESCRIPTION("IFAP EEPROM driver");
506 MODULE_SUPPORTED_DEVICE("ifxmips_eeprom");