mirror of https://github.com/hak5/openwrt.git
542 lines
11 KiB
C
542 lines
11 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*
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* This driver was originally based on the INCA-IP driver, but due to
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* fundamental conceptual drawbacks there has been changed a lot.
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*
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* Based on INCA-IP driver Copyright (c) 2003 Gary Jennejohn <gj@denx.de>
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* Based on the VxWorks drivers Copyright (c) 2002, Infineon Technologies.
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*
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* Copyright (C) 2006 infineon
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* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
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*
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*/
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#define IFAP_EEPROM_DRV_VERSION "0.0.1"
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/signal.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/interrupt.h>
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#include <linux/major.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/ptrace.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <asm/system.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/uaccess.h>
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#include <asm/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/version.h>
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#include <asm/ifxmips/ifxmips.h>
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#include <asm/ifxmips/ifxmips_irq.h>
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#include <asm/ifxmips/ifx_ssc_defines.h>
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#include <asm/ifxmips/ifx_ssc.h>
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/* allow the user to set the major device number */
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static int ifxmips_eeprom_maj = 0;
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extern int ifx_ssc_init (void);
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extern int ifx_ssc_open (struct inode *inode, struct file *filp);
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extern int ifx_ssc_close (struct inode *inode, struct file *filp);
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extern void ifx_ssc_cleanup_module (void);
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extern int ifx_ssc_ioctl (struct inode *inode, struct file *filp,
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unsigned int cmd, unsigned long data);
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extern ssize_t ifx_ssc_kwrite (int port, const char *kbuf, size_t len);
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extern ssize_t ifx_ssc_kread (int port, char *kbuf, size_t len);
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extern int ifx_ssc_cs_low (unsigned int pin);
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extern int ifx_ssc_cs_high (unsigned int pin);
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extern int ifx_ssc_txrx (char *tx_buf, unsigned int tx_len, char *rx_buf, unsigned int rx_len);
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extern int ifx_ssc_tx (char *tx_buf, unsigned int tx_len);
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extern int ifx_ssc_rx (char *rx_buf, unsigned int rx_len);
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#define EEPROM_CS IFX_SSC_WHBGPOSTAT_OUT0_POS
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/* commands for EEPROM, x25160, x25140 */
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#define EEPROM_WREN ((unsigned char)0x06)
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#define EEPROM_WRDI ((unsigned char)0x04)
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#define EEPROM_RDSR ((unsigned char)0x05)
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#define EEPROM_WRSR ((unsigned char)0x01)
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#define EEPROM_READ ((unsigned char)0x03)
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#define EEPROM_WRITE ((unsigned char)0x02)
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#define EEPROM_PAGE_SIZE 4
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#define EEPROM_SIZE 512
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static int
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eeprom_rdsr (void)
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{
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int ret = 0;
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unsigned char cmd = EEPROM_RDSR;
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unsigned long flag;
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char status;
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local_irq_save(flag);
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)) == 0)
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if ((ret = ifx_ssc_txrx(&cmd, 1, &status, 1)) >= 0)
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ret = status & 1;
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ifx_ssc_cs_high(EEPROM_CS);
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local_irq_restore(flag);
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return ret;
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}
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void
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eeprom_wip_over (void)
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{
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while (eeprom_rdsr())
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printk("waiting for eeprom\n");
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}
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static int
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eeprom_wren (void)
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{
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unsigned char cmd = EEPROM_WREN;
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int ret = 0;
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unsigned long flag;
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local_irq_save(flag);
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)) == 0)
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if ((ret = ifx_ssc_tx(&cmd, 1)) >= 0)
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ret = 0;
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ifx_ssc_cs_high(EEPROM_CS);
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local_irq_restore(flag);
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if (!ret)
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eeprom_wip_over();
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return ret;
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}
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static int
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eeprom_wrsr (void)
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{
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int ret = 0;
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unsigned char cmd[2];
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unsigned long flag;
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cmd[0] = EEPROM_WRSR;
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cmd[1] = 0;
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if ((ret = eeprom_wren()))
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{
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printk ("eeprom_wren fails\n");
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goto out1;
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}
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local_irq_save(flag);
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
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goto out;
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if ((ret = ifx_ssc_tx(cmd, 2)) < 0) {
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ifx_ssc_cs_high(EEPROM_CS);
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goto out;
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}
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
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goto out;
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local_irq_restore(flag);
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eeprom_wip_over();
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return ret;
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out:
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local_irq_restore (flag);
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eeprom_wip_over ();
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out1:
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return ret;
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}
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static int
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eeprom_read (unsigned int addr, unsigned char *buf, unsigned int len)
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{
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int ret = 0;
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unsigned char write_buf[2];
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unsigned int eff = 0;
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unsigned long flag;
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while (1)
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{
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eeprom_wip_over();
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eff = EEPROM_PAGE_SIZE - (addr % EEPROM_PAGE_SIZE);
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eff = (eff < len) ? eff : len;
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local_irq_save(flag);
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)) < 0)
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goto out;
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write_buf[0] = EEPROM_READ | ((unsigned char) ((addr & 0x100) >> 5));
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write_buf[1] = (addr & 0xff);
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if ((ret = ifx_ssc_txrx (write_buf, 2, buf, eff)) != eff)
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{
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printk("ssc_txrx fails %d\n", ret);
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ifx_ssc_cs_high (EEPROM_CS);
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goto out;
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}
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buf += ret;
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len -= ret;
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addr += ret;
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if ((ret = ifx_ssc_cs_high(EEPROM_CS)))
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goto out;
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local_irq_restore(flag);
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if (len <= 0)
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goto out2;
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}
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out:
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local_irq_restore (flag);
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out2:
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return ret;
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}
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static int
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eeprom_write (unsigned int addr, unsigned char *buf, unsigned int len)
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{
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int ret = 0;
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unsigned int eff = 0;
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unsigned char write_buf[2];
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int i;
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unsigned char rx_buf[EEPROM_PAGE_SIZE];
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while (1)
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{
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eeprom_wip_over();
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if ((ret = eeprom_wren()))
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{
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printk("eeprom_wren fails\n");
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goto out;
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}
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write_buf[0] = EEPROM_WRITE | ((unsigned char) ((addr & 0x100) >> 5));
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write_buf[1] = (addr & 0xff);
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eff = EEPROM_PAGE_SIZE - (addr % EEPROM_PAGE_SIZE);
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eff = (eff < len) ? eff : len;
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printk("EEPROM Write:\n");
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for (i = 0; i < eff; i++) {
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printk("%2x ", buf[i]);
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if ((i % 16) == 15)
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printk("\n");
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}
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printk("\n");
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if ((ret = ifx_ssc_cs_low(EEPROM_CS)))
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goto out;
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if ((ret = ifx_ssc_tx (write_buf, 2)) < 0)
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{
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printk("ssc_tx fails %d\n", ret);
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ifx_ssc_cs_high(EEPROM_CS);
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goto out;
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}
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if ((ret = ifx_ssc_tx (buf, eff)) != eff)
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{
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printk("ssc_tx fails %d\n", ret);
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ifx_ssc_cs_high(EEPROM_CS);
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goto out;
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}
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buf += ret;
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len -= ret;
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addr += ret;
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if ((ret = ifx_ssc_cs_high (EEPROM_CS)))
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goto out;
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printk ("<==");
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eeprom_read((addr - eff), rx_buf, eff);
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for (i = 0; i < eff; i++)
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{
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printk ("[%x]", rx_buf[i]);
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}
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printk ("\n");
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if (len <= 0)
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break;
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}
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out:
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return ret;
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}
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int
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ifxmips_eeprom_open (struct inode *inode, struct file *filp)
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{
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filp->f_pos = 0;
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return 0;
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}
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int
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ifxmips_eeprom_close (struct inode *inode, struct file *filp)
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{
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return 0;
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}
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int
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ifxmips_eeprom_ioctl (struct inode *inode, struct file *filp, unsigned int cmd, unsigned long data)
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{
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return 0;
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}
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ssize_t
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ifxmips_eeprom_read (char *buf, size_t len, unsigned int addr)
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{
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int ret = 0;
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unsigned int data;
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printk("addr:=%d\n", addr);
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printk("len:=%d\n", len);
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if ((addr + len) > EEPROM_SIZE)
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{
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printk("invalid len\n");
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addr = 0;
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len = EEPROM_SIZE / 2;
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}
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if ((ret = ifx_ssc_open((struct inode *) 0, NULL)))
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{
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printk("ifxmips_eeprom_open fails\n");
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goto out;
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}
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data = (unsigned int)IFX_SSC_MODE_RXTX;
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if ((ret = ifx_ssc_ioctl((struct inode *) 0, NULL, IFX_SSC_RXTX_MODE_SET, (unsigned long) &data)))
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{
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printk("set RXTX mode fails\n");
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goto out;
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}
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if ((ret = eeprom_wrsr()))
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{
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printk("EEPROM reset fails\n");
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goto out;
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}
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if ((ret = eeprom_read(addr, buf, len)))
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{
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printk("eeprom read fails\n");
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goto out;
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}
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out:
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if (ifx_ssc_close((struct inode *) 0, NULL))
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printk("ifxmips_eeprom_close fails\n");
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return len;
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}
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EXPORT_SYMBOL(ifxmips_eeprom_read);
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static ssize_t
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ifxmips_eeprom_fops_read (struct file *filp, char *ubuf, size_t len, loff_t * off)
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{
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int ret = 0;
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unsigned char ssc_rx_buf[EEPROM_SIZE];
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long flag;
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if (*off >= EEPROM_SIZE)
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return 0;
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if (*off + len > EEPROM_SIZE)
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len = EEPROM_SIZE - *off;
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if (len == 0)
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return 0;
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local_irq_save(flag);
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if ((ret = ifxmips_eeprom_read(ssc_rx_buf, len, *off)) < 0)
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{
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printk("read fails, err=%x\n", ret);
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local_irq_restore(flag);
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return ret;
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}
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if (copy_to_user((void*)ubuf, ssc_rx_buf, ret) != 0)
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{
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local_irq_restore(flag);
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ret = -EFAULT;
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}
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local_irq_restore(flag);
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*off += len;
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return len;
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}
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ssize_t
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ifxmips_eeprom_write (char *buf, size_t len, unsigned int addr)
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{
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int ret = 0;
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unsigned int data;
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if ((ret = ifx_ssc_open ((struct inode *) 0, NULL)))
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{
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printk ("ifxmips_eeprom_open fails\n");
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goto out;
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}
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data = (unsigned int) IFX_SSC_MODE_RXTX;
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if ((ret = ifx_ssc_ioctl ((struct inode *) 0, NULL, IFX_SSC_RXTX_MODE_SET, (unsigned long) &data)))
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{
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printk ("set RXTX mode fails\n");
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goto out;
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}
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if ((ret = eeprom_wrsr ())) {
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printk ("EEPROM reset fails\n");
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goto out;
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}
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if ((ret = eeprom_write (addr, buf, len))) {
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printk ("eeprom write fails\n");
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goto out;
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}
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out:
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if (ifx_ssc_close ((struct inode *) 0, NULL))
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printk ("ifxmips_eeprom_close fails\n");
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return ret;
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}
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EXPORT_SYMBOL(ifxmips_eeprom_write);
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static ssize_t
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ifxmips_eeprom_fops_write (struct file *filp, const char *ubuf, size_t len, loff_t * off)
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{
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int ret = 0;
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unsigned char ssc_tx_buf[EEPROM_SIZE];
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if (*off >= EEPROM_SIZE)
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return 0;
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if (len + *off > EEPROM_SIZE)
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len = EEPROM_SIZE - *off;
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if ((ret = copy_from_user (ssc_tx_buf, ubuf, len)))
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return EFAULT;
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ret = ifxmips_eeprom_write (ssc_tx_buf, len, *off);
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if (ret > 0)
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*off = ret;
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return ret;
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}
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loff_t
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ifxmips_eeprom_llseek (struct file * filp, loff_t off, int whence)
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{
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loff_t newpos;
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switch (whence) {
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case SEEK_SET:
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newpos = off;
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break;
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case SEEK_CUR:
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newpos = filp->f_pos + off;
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break;
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default:
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return -EINVAL;
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}
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if (newpos < 0)
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return -EINVAL;
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filp->f_pos = newpos;
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return newpos;
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}
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static struct file_operations ifxmips_eeprom_fops = {
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owner:THIS_MODULE,
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llseek:ifxmips_eeprom_llseek,
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read:ifxmips_eeprom_fops_read,
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write:ifxmips_eeprom_fops_write,
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ioctl:ifxmips_eeprom_ioctl,
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open:ifxmips_eeprom_open,
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release:ifxmips_eeprom_close,
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};
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int __init
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ifxmips_eeprom_init (void)
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{
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int ret = 0;
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ifxmips_eeprom_maj = register_chrdev(0, "eeprom", &ifxmips_eeprom_fops);
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if (ifxmips_eeprom_maj < 0)
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{
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printk("failed to register eeprom device\n");
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ret = -EINVAL;
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goto out;
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}
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printk("ifxmips_eeprom : /dev/eeprom mayor %d\n", ifxmips_eeprom_maj);
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out:
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return ret;
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}
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void __exit
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ifxmips_eeprom_cleanup_module (void)
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{
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/*if (unregister_chrdev (ifxmips_eeprom_maj, "eeprom")) {
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printk ("Unable to unregister major %d for the EEPROM\n",
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maj);
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}*/
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}
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module_exit (ifxmips_eeprom_cleanup_module);
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module_init (ifxmips_eeprom_init);
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MODULE_LICENSE ("GPL");
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MODULE_AUTHOR ("Peng Liu");
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MODULE_DESCRIPTION ("IFAP EEPROM driver");
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MODULE_SUPPORTED_DEVICE ("ifxmips_eeprom");
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