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b808b1d632
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
713 lines
17 KiB
C
713 lines
17 KiB
C
/*
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* CMOS/NV-RAM driver for Linux
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*
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* Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
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* idea by and with help from Richard Jelinek <rj@suse.de>
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* Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com)
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*
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* This driver allows you to access the contents of the non-volatile memory in
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* the mc146818rtc.h real-time clock. This chip is built into all PCs and into
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* many Atari machines. In the former it's called "CMOS-RAM", in the latter
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* "NVRAM" (NV stands for non-volatile).
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*
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* The data are supplied as a (seekable) character device, /dev/nvram. The
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* size of this file is dependent on the controller. The usual size is 114,
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* the number of freely available bytes in the memory (i.e., not used by the
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* RTC itself).
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*
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* Checksums over the NVRAM contents are managed by this driver. In case of a
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* bad checksum, reads and writes return -EIO. The checksum can be initialized
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* to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or
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* ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid
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* again; use with care!)
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*
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* This file also provides some functions for other parts of the kernel that
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* want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}.
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* Obviously this can be used only if this driver is always configured into
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* the kernel and is not a module. Since the functions are used by some Atari
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* drivers, this is the case on the Atari.
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*
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*
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* 1.1 Cesar Barros: SMP locking fixes
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* added changelog
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* 1.2 Erik Gilling: Cobalt Networks support
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* Tim Hockin: general cleanup, Cobalt support
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* 1.3 Wim Van Sebroeck: convert PRINT_PROC to seq_file
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*/
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#define NVRAM_VERSION "1.3"
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#include <linux/module.h>
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#include <linux/nvram.h>
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#define PC 1
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#define ATARI 2
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/* select machine configuration */
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#if defined(CONFIG_ATARI)
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# define MACH ATARI
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#elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and ?? */
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# define MACH PC
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#else
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# error Cannot build nvram driver for this machine configuration.
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#endif
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#if MACH == PC
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/* RTC in a PC */
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#define CHECK_DRIVER_INIT() 1
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/* On PCs, the checksum is built only over bytes 2..31 */
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#define PC_CKS_RANGE_START 2
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#define PC_CKS_RANGE_END 31
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#define PC_CKS_LOC 32
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#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
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#define mach_check_checksum pc_check_checksum
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#define mach_set_checksum pc_set_checksum
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#define mach_proc_infos pc_proc_infos
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#endif
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#if MACH == ATARI
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/* Special parameters for RTC in Atari machines */
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#include <asm/atarihw.h>
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#include <asm/atariints.h>
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#define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
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#define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
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#define NVRAM_BYTES 50
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/* On Ataris, the checksum is over all bytes except the checksum bytes
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* themselves; these are at the very end */
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#define ATARI_CKS_RANGE_START 0
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#define ATARI_CKS_RANGE_END 47
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#define ATARI_CKS_LOC 48
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#define mach_check_checksum atari_check_checksum
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#define mach_set_checksum atari_set_checksum
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#define mach_proc_infos atari_proc_infos
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#endif
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/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
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* rtc_lock held. Due to the index-port/data-port design of the RTC, we
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* don't want two different things trying to get to it at once. (e.g. the
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* periodic 11 min sync from kernel/time/ntp.c vs. this driver.)
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*/
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#include <linux/types.h>
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#include <linux/errno.h>
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#include <linux/miscdevice.h>
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#include <linux/ioport.h>
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#include <linux/fcntl.h>
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#include <linux/mc146818rtc.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/mutex.h>
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#include <linux/pagemap.h>
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static DEFINE_MUTEX(nvram_mutex);
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static DEFINE_SPINLOCK(nvram_state_lock);
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static int nvram_open_cnt; /* #times opened */
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static int nvram_open_mode; /* special open modes */
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#define NVRAM_WRITE 1 /* opened for writing (exclusive) */
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#define NVRAM_EXCL 2 /* opened with O_EXCL */
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static int mach_check_checksum(void);
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static void mach_set_checksum(void);
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#ifdef CONFIG_PROC_FS
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static void mach_proc_infos(unsigned char *contents, struct seq_file *seq,
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void *offset);
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#endif
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/*
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* These functions are provided to be called internally or by other parts of
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* the kernel. It's up to the caller to ensure correct checksum before reading
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* or after writing (needs to be done only once).
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*
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* It is worth noting that these functions all access bytes of general
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* purpose memory in the NVRAM - that is to say, they all add the
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* NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
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* know about the RTC cruft.
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*/
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unsigned char __nvram_read_byte(int i)
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{
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return CMOS_READ(NVRAM_FIRST_BYTE + i);
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}
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EXPORT_SYMBOL(__nvram_read_byte);
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unsigned char nvram_read_byte(int i)
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{
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unsigned long flags;
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unsigned char c;
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spin_lock_irqsave(&rtc_lock, flags);
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c = __nvram_read_byte(i);
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spin_unlock_irqrestore(&rtc_lock, flags);
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return c;
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}
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EXPORT_SYMBOL(nvram_read_byte);
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/* This races nicely with trying to read with checksum checking (nvram_read) */
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void __nvram_write_byte(unsigned char c, int i)
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{
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CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
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}
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EXPORT_SYMBOL(__nvram_write_byte);
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void nvram_write_byte(unsigned char c, int i)
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{
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unsigned long flags;
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spin_lock_irqsave(&rtc_lock, flags);
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__nvram_write_byte(c, i);
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spin_unlock_irqrestore(&rtc_lock, flags);
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}
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EXPORT_SYMBOL(nvram_write_byte);
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int __nvram_check_checksum(void)
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{
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return mach_check_checksum();
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}
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EXPORT_SYMBOL(__nvram_check_checksum);
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int nvram_check_checksum(void)
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{
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unsigned long flags;
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int rv;
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spin_lock_irqsave(&rtc_lock, flags);
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rv = __nvram_check_checksum();
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spin_unlock_irqrestore(&rtc_lock, flags);
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return rv;
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}
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EXPORT_SYMBOL(nvram_check_checksum);
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static void __nvram_set_checksum(void)
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{
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mach_set_checksum();
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}
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#if 0
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void nvram_set_checksum(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&rtc_lock, flags);
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__nvram_set_checksum();
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spin_unlock_irqrestore(&rtc_lock, flags);
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}
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#endif /* 0 */
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/*
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* The are the file operation function for user access to /dev/nvram
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*/
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static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
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{
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return generic_file_llseek_size(file, offset, origin, MAX_LFS_FILESIZE,
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NVRAM_BYTES);
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}
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static ssize_t nvram_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned char contents[NVRAM_BYTES];
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unsigned i = *ppos;
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unsigned char *tmp;
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spin_lock_irq(&rtc_lock);
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if (!__nvram_check_checksum())
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goto checksum_err;
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for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
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*tmp = __nvram_read_byte(i);
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spin_unlock_irq(&rtc_lock);
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if (copy_to_user(buf, contents, tmp - contents))
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return -EFAULT;
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*ppos = i;
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return tmp - contents;
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checksum_err:
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spin_unlock_irq(&rtc_lock);
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return -EIO;
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}
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static ssize_t nvram_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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unsigned char contents[NVRAM_BYTES];
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unsigned i = *ppos;
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unsigned char *tmp;
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if (i >= NVRAM_BYTES)
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return 0; /* Past EOF */
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if (count > NVRAM_BYTES - i)
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count = NVRAM_BYTES - i;
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if (count > NVRAM_BYTES)
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return -EFAULT; /* Can't happen, but prove it to gcc */
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if (copy_from_user(contents, buf, count))
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return -EFAULT;
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spin_lock_irq(&rtc_lock);
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if (!__nvram_check_checksum())
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goto checksum_err;
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for (tmp = contents; count--; ++i, ++tmp)
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__nvram_write_byte(*tmp, i);
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__nvram_set_checksum();
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spin_unlock_irq(&rtc_lock);
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*ppos = i;
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return tmp - contents;
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checksum_err:
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spin_unlock_irq(&rtc_lock);
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return -EIO;
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}
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static long nvram_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int i;
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switch (cmd) {
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case NVRAM_INIT:
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/* initialize NVRAM contents and checksum */
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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mutex_lock(&nvram_mutex);
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spin_lock_irq(&rtc_lock);
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for (i = 0; i < NVRAM_BYTES; ++i)
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__nvram_write_byte(0, i);
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__nvram_set_checksum();
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spin_unlock_irq(&rtc_lock);
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mutex_unlock(&nvram_mutex);
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return 0;
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case NVRAM_SETCKS:
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/* just set checksum, contents unchanged (maybe useful after
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* checksum garbaged somehow...) */
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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mutex_lock(&nvram_mutex);
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spin_lock_irq(&rtc_lock);
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__nvram_set_checksum();
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spin_unlock_irq(&rtc_lock);
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mutex_unlock(&nvram_mutex);
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return 0;
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default:
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return -ENOTTY;
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}
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}
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static int nvram_open(struct inode *inode, struct file *file)
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{
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spin_lock(&nvram_state_lock);
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if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
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(nvram_open_mode & NVRAM_EXCL) ||
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((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
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spin_unlock(&nvram_state_lock);
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return -EBUSY;
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}
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if (file->f_flags & O_EXCL)
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nvram_open_mode |= NVRAM_EXCL;
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if (file->f_mode & FMODE_WRITE)
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nvram_open_mode |= NVRAM_WRITE;
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nvram_open_cnt++;
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spin_unlock(&nvram_state_lock);
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return 0;
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}
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static int nvram_release(struct inode *inode, struct file *file)
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{
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spin_lock(&nvram_state_lock);
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nvram_open_cnt--;
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/* if only one instance is open, clear the EXCL bit */
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if (nvram_open_mode & NVRAM_EXCL)
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nvram_open_mode &= ~NVRAM_EXCL;
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if (file->f_mode & FMODE_WRITE)
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nvram_open_mode &= ~NVRAM_WRITE;
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spin_unlock(&nvram_state_lock);
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return 0;
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}
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#ifndef CONFIG_PROC_FS
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static int nvram_add_proc_fs(void)
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{
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return 0;
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}
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#else
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static int nvram_proc_read(struct seq_file *seq, void *offset)
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{
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unsigned char contents[NVRAM_BYTES];
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int i = 0;
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spin_lock_irq(&rtc_lock);
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for (i = 0; i < NVRAM_BYTES; ++i)
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contents[i] = __nvram_read_byte(i);
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spin_unlock_irq(&rtc_lock);
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mach_proc_infos(contents, seq, offset);
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return 0;
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}
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static int nvram_proc_open(struct inode *inode, struct file *file)
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{
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return single_open(file, nvram_proc_read, NULL);
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}
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static const struct file_operations nvram_proc_fops = {
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.owner = THIS_MODULE,
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.open = nvram_proc_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int nvram_add_proc_fs(void)
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{
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if (!proc_create("driver/nvram", 0, NULL, &nvram_proc_fops))
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return -ENOMEM;
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return 0;
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}
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#endif /* CONFIG_PROC_FS */
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static const struct file_operations nvram_fops = {
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.owner = THIS_MODULE,
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.llseek = nvram_llseek,
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.read = nvram_read,
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.write = nvram_write,
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.unlocked_ioctl = nvram_ioctl,
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.open = nvram_open,
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.release = nvram_release,
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};
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static struct miscdevice nvram_dev = {
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NVRAM_MINOR,
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"nvram",
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&nvram_fops
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};
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static int __init nvram_init(void)
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{
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int ret;
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/* First test whether the driver should init at all */
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if (!CHECK_DRIVER_INIT())
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return -ENODEV;
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ret = misc_register(&nvram_dev);
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if (ret) {
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printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
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NVRAM_MINOR);
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goto out;
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}
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ret = nvram_add_proc_fs();
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if (ret) {
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printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
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goto outmisc;
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}
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ret = 0;
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printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
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out:
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return ret;
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outmisc:
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misc_deregister(&nvram_dev);
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goto out;
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}
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static void __exit nvram_cleanup_module(void)
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{
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remove_proc_entry("driver/nvram", NULL);
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misc_deregister(&nvram_dev);
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}
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module_init(nvram_init);
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module_exit(nvram_cleanup_module);
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/*
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* Machine specific functions
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*/
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#if MACH == PC
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static int pc_check_checksum(void)
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{
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int i;
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unsigned short sum = 0;
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unsigned short expect;
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for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
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sum += __nvram_read_byte(i);
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expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
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__nvram_read_byte(PC_CKS_LOC+1);
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return (sum & 0xffff) == expect;
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}
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static void pc_set_checksum(void)
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{
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int i;
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unsigned short sum = 0;
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for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
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sum += __nvram_read_byte(i);
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__nvram_write_byte(sum >> 8, PC_CKS_LOC);
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__nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
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}
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#ifdef CONFIG_PROC_FS
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static char *floppy_types[] = {
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"none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
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"3.5'' 2.88M", "3.5'' 2.88M"
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};
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static char *gfx_types[] = {
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"EGA, VGA, ... (with BIOS)",
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"CGA (40 cols)",
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"CGA (80 cols)",
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"monochrome",
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};
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static void pc_proc_infos(unsigned char *nvram, struct seq_file *seq,
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void *offset)
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{
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int checksum;
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int type;
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spin_lock_irq(&rtc_lock);
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checksum = __nvram_check_checksum();
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spin_unlock_irq(&rtc_lock);
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seq_printf(seq, "Checksum status: %svalid\n", checksum ? "" : "not ");
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seq_printf(seq, "# floppies : %d\n",
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(nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
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seq_printf(seq, "Floppy 0 type : ");
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type = nvram[2] >> 4;
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if (type < ARRAY_SIZE(floppy_types))
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seq_printf(seq, "%s\n", floppy_types[type]);
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else
|
|
seq_printf(seq, "%d (unknown)\n", type);
|
|
seq_printf(seq, "Floppy 1 type : ");
|
|
type = nvram[2] & 0x0f;
|
|
if (type < ARRAY_SIZE(floppy_types))
|
|
seq_printf(seq, "%s\n", floppy_types[type]);
|
|
else
|
|
seq_printf(seq, "%d (unknown)\n", type);
|
|
|
|
seq_printf(seq, "HD 0 type : ");
|
|
type = nvram[4] >> 4;
|
|
if (type)
|
|
seq_printf(seq, "%02x\n", type == 0x0f ? nvram[11] : type);
|
|
else
|
|
seq_printf(seq, "none\n");
|
|
|
|
seq_printf(seq, "HD 1 type : ");
|
|
type = nvram[4] & 0x0f;
|
|
if (type)
|
|
seq_printf(seq, "%02x\n", type == 0x0f ? nvram[12] : type);
|
|
else
|
|
seq_printf(seq, "none\n");
|
|
|
|
seq_printf(seq, "HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
|
|
nvram[18] | (nvram[19] << 8),
|
|
nvram[20], nvram[25],
|
|
nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
|
|
seq_printf(seq, "HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
|
|
nvram[39] | (nvram[40] << 8),
|
|
nvram[41], nvram[46],
|
|
nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
|
|
|
|
seq_printf(seq, "DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
|
|
seq_printf(seq, "Extended memory: %d kB (configured), %d kB (tested)\n",
|
|
nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
|
|
|
|
seq_printf(seq, "Gfx adapter : %s\n",
|
|
gfx_types[(nvram[6] >> 4) & 3]);
|
|
|
|
seq_printf(seq, "FPU : %sinstalled\n",
|
|
(nvram[6] & 2) ? "" : "not ");
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#endif /* MACH == PC */
|
|
|
|
#if MACH == ATARI
|
|
|
|
static int atari_check_checksum(void)
|
|
{
|
|
int i;
|
|
unsigned char sum = 0;
|
|
|
|
for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
|
|
sum += __nvram_read_byte(i);
|
|
return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff)) &&
|
|
(__nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
|
|
}
|
|
|
|
static void atari_set_checksum(void)
|
|
{
|
|
int i;
|
|
unsigned char sum = 0;
|
|
|
|
for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
|
|
sum += __nvram_read_byte(i);
|
|
__nvram_write_byte(~sum, ATARI_CKS_LOC);
|
|
__nvram_write_byte(sum, ATARI_CKS_LOC + 1);
|
|
}
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static struct {
|
|
unsigned char val;
|
|
char *name;
|
|
} boot_prefs[] = {
|
|
{ 0x80, "TOS" },
|
|
{ 0x40, "ASV" },
|
|
{ 0x20, "NetBSD (?)" },
|
|
{ 0x10, "Linux" },
|
|
{ 0x00, "unspecified" }
|
|
};
|
|
|
|
static char *languages[] = {
|
|
"English (US)",
|
|
"German",
|
|
"French",
|
|
"English (UK)",
|
|
"Spanish",
|
|
"Italian",
|
|
"6 (undefined)",
|
|
"Swiss (French)",
|
|
"Swiss (German)"
|
|
};
|
|
|
|
static char *dateformat[] = {
|
|
"MM%cDD%cYY",
|
|
"DD%cMM%cYY",
|
|
"YY%cMM%cDD",
|
|
"YY%cDD%cMM",
|
|
"4 (undefined)",
|
|
"5 (undefined)",
|
|
"6 (undefined)",
|
|
"7 (undefined)"
|
|
};
|
|
|
|
static char *colors[] = {
|
|
"2", "4", "16", "256", "65536", "??", "??", "??"
|
|
};
|
|
|
|
static void atari_proc_infos(unsigned char *nvram, struct seq_file *seq,
|
|
void *offset)
|
|
{
|
|
int checksum = nvram_check_checksum();
|
|
int i;
|
|
unsigned vmode;
|
|
|
|
seq_printf(seq, "Checksum status : %svalid\n", checksum ? "" : "not ");
|
|
|
|
seq_printf(seq, "Boot preference : ");
|
|
for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
|
|
if (nvram[1] == boot_prefs[i].val) {
|
|
seq_printf(seq, "%s\n", boot_prefs[i].name);
|
|
break;
|
|
}
|
|
}
|
|
if (i < 0)
|
|
seq_printf(seq, "0x%02x (undefined)\n", nvram[1]);
|
|
|
|
seq_printf(seq, "SCSI arbitration : %s\n",
|
|
(nvram[16] & 0x80) ? "on" : "off");
|
|
seq_printf(seq, "SCSI host ID : ");
|
|
if (nvram[16] & 0x80)
|
|
seq_printf(seq, "%d\n", nvram[16] & 7);
|
|
else
|
|
seq_printf(seq, "n/a\n");
|
|
|
|
/* the following entries are defined only for the Falcon */
|
|
if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
|
|
return;
|
|
|
|
seq_printf(seq, "OS language : ");
|
|
if (nvram[6] < ARRAY_SIZE(languages))
|
|
seq_printf(seq, "%s\n", languages[nvram[6]]);
|
|
else
|
|
seq_printf(seq, "%u (undefined)\n", nvram[6]);
|
|
seq_printf(seq, "Keyboard language: ");
|
|
if (nvram[7] < ARRAY_SIZE(languages))
|
|
seq_printf(seq, "%s\n", languages[nvram[7]]);
|
|
else
|
|
seq_printf(seq, "%u (undefined)\n", nvram[7]);
|
|
seq_printf(seq, "Date format : ");
|
|
seq_printf(seq, dateformat[nvram[8] & 7],
|
|
nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
|
|
seq_printf(seq, ", %dh clock\n", nvram[8] & 16 ? 24 : 12);
|
|
seq_printf(seq, "Boot delay : ");
|
|
if (nvram[10] == 0)
|
|
seq_printf(seq, "default");
|
|
else
|
|
seq_printf(seq, "%ds%s\n", nvram[10],
|
|
nvram[10] < 8 ? ", no memory test" : "");
|
|
|
|
vmode = (nvram[14] << 8) | nvram[15];
|
|
seq_printf(seq,
|
|
"Video mode : %s colors, %d columns, %s %s monitor\n",
|
|
colors[vmode & 7],
|
|
vmode & 8 ? 80 : 40,
|
|
vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
|
|
seq_printf(seq, " %soverscan, compat. mode %s%s\n",
|
|
vmode & 64 ? "" : "no ",
|
|
vmode & 128 ? "on" : "off",
|
|
vmode & 256 ?
|
|
(vmode & 16 ? ", line doubling" : ", half screen") : "");
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
#endif /* MACH == ATARI */
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_MISCDEV(NVRAM_MINOR);
|