ide-proc.c

ep9315平台下硬盘驱动的源码

/*
 *  linux/drivers/ide/ide-proc.c	Version 1.05	Mar 05, 2003
 *
 *  Copyright (C) 1997-1998	Mark Lord
 *  Copyright (C) 2003		Red Hat <[e-mail]>
 */

/*
 * This is the /proc/ide/ filesystem implementation.
 *
 * The major reason this exists is to provide sufficient access
 * to driver and config data, such that user-mode programs can
 * be developed to handle chipset tuning for most PCI interfaces.
 * This should provide better utilities, and less kernel bloat.
 *
 * The entire pci config space for a PCI interface chipset can be
 * retrieved by just reading it.  e.g.    "cat /proc/ide3/config"
 *
 * To modify registers *safely*, do something like:
 *   echo "P40:88" >/proc/ide/ide3/config
 * That expression writes 0x88 to pci config register 0x40
 * on the chip which controls ide3.  Multiple tuples can be issued,
 * and the writes will be completed as an atomic set:
 *   echo "P40:88 P41:35 P42:00 P43:00" >/proc/ide/ide3/config
 *
 * All numbers must be specified using pairs of ascii hex digits.
 * It is important to note that these writes will be performed
 * after waiting for the IDE controller (both interfaces)
 * to be completely idle, to ensure no corruption of I/O in progress.
 *
 * Non-PCI registers can also be written, using "R" in place of "P"
 * in the above examples.  The size of the port transfer is determined
 * by the number of pairs of hex digits given for the data.  If a two
 * digit value is given, the write will be a byte operation; if four
 * digits are used, the write will be performed as a 16-bit operation;
 * and if eight digits are specified, a 32-bit "dword" write will be
 * performed.  Odd numbers of digits are not permitted.
 *
 * If there is an error *anywhere* in the string of registers/data
 * then *none* of the writes will be performed.
 *
 * Drive/Driver settings can be retrieved by reading the drive's
 * "settings" files.  e.g.    "cat /proc/ide0/hda/settings"
 * To write a new value "val" into a specific setting "name", use:
 *   echo "name:val" >/proc/ide/ide0/hda/settings
 *
 * Also useful, "cat /proc/ide0/hda/[identify, smart_values,
 * smart_thresholds, capabilities]" will issue an IDENTIFY /
 * PACKET_IDENTIFY / SMART_READ_VALUES / SMART_READ_THRESHOLDS /
 * SENSE CAPABILITIES command to /dev/hda, and then dump out the
 * returned data as 256 16-bit words.  The "hdparm" utility will
 * be updated someday soon to use this mechanism.
 *
 * Feel free to develop and distribute fancy GUI configuration
 * utilities for your favorite PCI chipsets.  I'll be working on
 * one for the Promise 20246 someday soon.  -ml
 *
 */

#include <linux/config.h>
#define __NO_VERSION__
#include <linux/module.h>

#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/ctype.h>
#include <linux/hdreg.h>
#include <linux/ide.h>

#include <asm/io.h>

#ifdef CONFIG_ALL_PPC
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#endif

#ifndef MIN
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#endif

static int ide_getxdigit(char c)
{
	int digit;
	if (isdigit(c))
		digit = c - '0';
	else if (isxdigit(c))
		digit = tolower(c) - 'a' + 10;
	else
		digit = -1;
	return digit;
}

static int xx_xx_parse_error (const char *data, unsigned long len, const char *msg)
{
	char errbuf[16];
	int i;
	if (len >= sizeof(errbuf))
		len = sizeof(errbuf) - 1;
	for (i = 0; i < len; ++i) {
		char c = data[i];
		if (!c || c == '\n')
			c = '\0';
		else if (iscntrl(c))
			c = '?';
		errbuf[i] = c;
	}
	errbuf[i] = '\0';
	printk("proc_ide: error: %s: '%s'\n", msg, errbuf);
	return -EINVAL;
}

static struct proc_dir_entry * proc_ide_root = NULL;

#ifdef CONFIG_BLK_DEV_IDEPCI
#include <linux/delay.h>
/*
 * This is the list of registered PCI chipset driver data structures.
 */
static ide_pci_host_proc_t * ide_pci_host_proc_list;

#endif /* CONFIG_BLK_DEV_IDEPCI */

#undef __PROC_HELL

static int proc_ide_write_config
	(struct file *file, const char *buffer, unsigned long count, void *data)
{
	ide_hwif_t	*hwif = (ide_hwif_t *)data;
	int		for_real = 0;
	unsigned long	startn = 0, n, flags;
	const char	*start = NULL, *msg = NULL;

	if (!capable(CAP_SYS_ADMIN) || !capable(CAP_SYS_RAWIO))
		return -EACCES;
	/*
	 * Skip over leading whitespace
	 */
	while (count && isspace(*buffer)) {
		--count;
		++buffer;
	}
	/*
	 * Do one full pass to verify all parameters,
	 * then do another to actually write the regs.
	 */
#ifndef __PROC_HELL
	save_flags(flags);	/* all CPUs */
#else
	spin_lock_irqsave(&io_request_lock, flags);
#endif
	do {
		const char *p;
		if (for_real) {
			unsigned long timeout = jiffies + (3 * HZ);
			ide_hwgroup_t *mygroup = (ide_hwgroup_t *)(hwif->hwgroup);
			ide_hwgroup_t *mategroup = NULL;
			if (hwif->mate && hwif->mate->hwgroup)
				mategroup = (ide_hwgroup_t *)(hwif->mate->hwgroup);
#ifndef __PROC_HELL
			cli();	/* all CPUs; ensure all writes are done together */
#else
			spin_lock_irqsave(&io_request_lock, flags);
#endif
			while (mygroup->busy ||
			       (mategroup && mategroup->busy)) {
#ifndef __PROC_HELL
				sti();	/* all CPUs */
#else
				spin_unlock_irqrestore(&io_request_lock, flags);
#endif
				if (time_after(jiffies, timeout)) {
					printk("/proc/ide/%s/config: channel(s) busy, cannot write\n", hwif->name);
#ifndef __PROC_HELL
					restore_flags(flags);	/* all CPUs */
#else
					spin_unlock_irqrestore(&io_request_lock, flags);
#endif
					return -EBUSY;
				}
#ifndef __PROC_HELL
				cli();	/* all CPUs */
#else
				spin_lock_irqsave(&io_request_lock, flags);
#endif
			}
		}
		p = buffer;
		n = count;
		while (n > 0) {
			int d, digits;
			unsigned int reg = 0, val = 0, is_pci;
			start = p;
			startn = n--;
			switch (*p++) {
				case 'R':	is_pci = 0;
						break;
				case 'P':	is_pci = 1;
#ifdef CONFIG_BLK_DEV_IDEPCI
						if (hwif->pci_dev && !hwif->pci_dev->vendor)
							break;
#endif	/* CONFIG_BLK_DEV_IDEPCI */
						msg = "not a PCI device";
						goto parse_error;
				default:	msg = "expected 'R' or 'P'";
						goto parse_error;
			}
			digits = 0;
			while (n > 0 && (d = ide_getxdigit(*p)) >= 0) {
				reg = (reg << 4) | d;
				--n;
				++p;
				++digits;
			}
			if (!digits || (digits > 4) || (is_pci && reg > 0xff)) {
				msg = "bad/missing register number";
				goto parse_error;
			}
			if (n-- == 0 || *p++ != ':') {
				msg = "missing ':'";
				goto parse_error;
			}
			digits = 0;
			while (n > 0 && (d = ide_getxdigit(*p)) >= 0) {
				val = (val << 4) | d;
				--n;
				++p;
				++digits;
			}
			if (digits != 2 && digits != 4 && digits != 8) {
				msg = "bad data, 2/4/8 digits required";
				goto parse_error;
			}
			if (n > 0 && !isspace(*p)) {
				msg = "expected whitespace after data";
				goto parse_error;
			}
			while (n > 0 && isspace(*p)) {
				--n;
				++p;
			}
#ifdef CONFIG_BLK_DEV_IDEPCI
			if (is_pci && (reg & ((digits >> 1) - 1))) {
				msg = "misaligned access";
				goto parse_error;
			}
#endif	/* CONFIG_BLK_DEV_IDEPCI */
			if (for_real) {
#if 0
				printk("proc_ide_write_config: type=%c, reg=0x%x, val=0x%x, digits=%d\n", is_pci ? "PCI" : "non-PCI", reg, val, digits);
#endif
				if (is_pci) {
#ifdef CONFIG_BLK_DEV_IDEPCI
					int rc = 0;
					struct pci_dev *dev = hwif->pci_dev;
					switch (digits) {
						case 2:	msg = "byte";
							rc = pci_write_config_byte(dev, reg, val);
							break;
						case 4:	msg = "word";
							rc = pci_write_config_word(dev, reg, val);
							break;
						case 8:	msg = "dword";
							rc = pci_write_config_dword(dev, reg, val);
							break;
					}
					if (rc) {
#ifndef __PROC_HELL
						restore_flags(flags);	/* all CPUs */
#else
						spin_unlock_irqrestore(&io_request_lock, flags);
#endif
						printk("proc_ide_write_config: error writing %s at bus %02x dev %02x reg 0x%x value 0x%x\n",
							msg, dev->bus->number, dev->devfn, reg, val);
						printk("proc_ide_write_config: error %d\n", rc);
						return -EIO;
					}
#endif	/* CONFIG_BLK_DEV_IDEPCI */
				} else {	/* not pci */
#if !defined(__mc68000__) && !defined(CONFIG_APUS)

/*
 * Geert Uytterhoeven
 *
 * unless you can explain me what it really does.
 * On m68k, we don't have outw() and outl() yet,
 * and I need a good reason to implement it.
 * 
 * BTW, IMHO the main remaining portability problem with the IDE driver 
 * is that it mixes IO (ioport) and MMIO (iomem) access on different platforms.
 * 
 * I think all accesses should be done using
 * 
 *     ide_in[bwl](ide_device_instance, offset)
 *     ide_out[bwl](ide_device_instance, value, offset)
 * 
 * so the architecture specific code can #define ide_{in,out}[bwl] to the
 * appropriate function.
 * 
 */
					switch (digits) {
						case 2:	hwif->OUTB(val, reg);
							break;
						case 4:	hwif->OUTW(val, reg);
							break;
						case 8:	hwif->OUTL(val, reg);
							break;
					}
#endif /* !__mc68000__ && !CONFIG_APUS */
				}
			}
		}
	} while (!for_real++);
#ifndef __PROC_HELL
	restore_flags(flags);	/* all CPUs */
#else
	spin_unlock_irqrestore(&io_request_lock, flags);
#endif
	return count;
parse_error:
#ifndef __PROC_HELL
	restore_flags(flags);	/* all CPUs */
#else
	spin_unlock_irqrestore(&io_request_lock, flags);
#endif
	printk("parse error\n");
	return xx_xx_parse_error(start, startn, msg);
}

int proc_ide_read_config
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	char		*out = page;
	int		len;

#ifdef CONFIG_BLK_DEV_IDEPCI
	ide_hwif_t	*hwif = (ide_hwif_t *)data;
	struct pci_dev	*dev = hwif->pci_dev;
	if ((hwif->pci_dev && hwif->pci_dev->vendor) && dev && dev->bus) {
		int reg = 0;

		out += sprintf(out, "pci bus %02x device %02x vendor %04x "
				"device %04x channel %d\n",
			dev->bus->number, dev->devfn,
			hwif->pci_dev->vendor, hwif->pci_dev->device,
			hwif->channel);
		do {
			u8 val;
			int rc = pci_read_config_byte(dev, reg, &val);
			if (rc) {
				printk("proc_ide_read_config: error %d reading"
					" bus %02x dev %02x reg 0x%02x\n",
					rc, dev->bus->number, dev->devfn, reg);
				out += sprintf(out, "??%c",
					(++reg & 0xf) ? ' ' : '\n');
			} else
				out += sprintf(out, "%02x%c",
					val, (++reg & 0xf) ? ' ' : '\n');
		} while (reg < 0x100);
	} else
#endif	/* CONFIG_BLK_DEV_IDEPCI */
		out += sprintf(out, "(none)\n");
	len = out - page;
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL(proc_ide_read_config);

static int ide_getdigit(char c)
{
	int digit;
	if (isdigit(c))
		digit = c - '0';
	else
		digit = -1;
	return digit;
}

int proc_ide_read_drivers
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	char		*out = page;
	int		len;
	ide_module_t	*p = ide_modules;
	ide_driver_t	*driver;

	while (p) {
		driver = (ide_driver_t *) p->info;
		if (driver)
			out += sprintf(out, "%s version %s\n",
				driver->name, driver->version);
		p = p->next;
	}
	len = out - page;
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL(proc_ide_read_drivers);

int proc_ide_read_imodel
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) data;
	int		len;
	const char	*name;

	switch (hwif->chipset) {
		case ide_unknown:	name = "(none)";	break;
		case ide_generic:	name = "generic";	break;
		case ide_pci:		name = "pci";		break;
		case ide_cmd640:	name = "cmd640";	break;
		case ide_dtc2278:	name = "dtc2278";	break;
		case ide_ali14xx:	name = "ali14xx";	break;
		case ide_qd65xx:	name = "qd65xx";	break;
		case ide_umc8672:	name = "umc8672";	break;
		case ide_ht6560b:	name = "ht6560b";	break;
		case ide_pdc4030:	name = "pdc4030";	break;
		case ide_rz1000:	name = "rz1000";	break;
		case ide_trm290:	name = "trm290";	break;
		case ide_cmd646:	name = "cmd646";	break;
		case ide_cy82c693:	name = "cy82c693";	break;
		case ide_4drives:	name = "4drives";	break;
		case ide_pmac:		name = "pmac";		break;
		case ide_acorn:		name = "acorn";		break;
		default:		name = "(unknown)";	break;
	}
	len = sprintf(page, "%s\n", name);
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

#ifdef CONFIG_ALL_PPC
static int proc_ide_read_devspec
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_hwif_t		*hwif = (ide_hwif_t *) data;
	int			len;
	struct device_node	*ofnode = NULL;

#ifdef CONFIG_BLK_DEV_IDE_PMAC
	extern struct device_node* pmac_ide_get_of_node(int index);
	if (hwif->chipset == ide_pmac)
		ofnode = pmac_ide_get_of_node(hwif->index);
#endif /* CONFIG_BLK_DEV_IDE_PMAC */
#ifdef CONFIG_PCI
	if (ofnode == NULL && hwif->pci_dev)
		ofnode = pci_device_to_OF_node(hwif->pci_dev);
#endif /* CONFIG_PCI */		
	len = sprintf(page, "%s\n", ofnode ? ofnode->full_name : "");
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}
#endif /* CONFIG_ALL_PPC */

EXPORT_SYMBOL(proc_ide_read_imodel);

int proc_ide_read_mate
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) data;
	int		len;

	if (hwif && hwif->mate && hwif->mate->present)
		len = sprintf(page, "%s\n", hwif->mate->name);
	else
		len = sprintf(page, "(none)\n");
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL(proc_ide_read_mate);

int proc_ide_read_channel
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_hwif_t	*hwif = (ide_hwif_t *) data;
	int		len;

	page[0] = hwif->channel ? '1' : '0';
	page[1] = '\n';
	len = 2;
	PROC_IDE_READ_RETURN(page,start,off,count,eof,len);
}

EXPORT_SYMBOL(proc_ide_read_channel);

int proc_ide_read_identify
	(char *page, char **start, off_t off, int count, int *eof, void *data)
{
	ide_drive_t	*drive = (ide_drive_t *)data;
	int		len = 0, i = 0;
	int		err = 0;

	len = sprintf(page, "\n");
	
	if (drive)
	{
		unsigned short *val = (unsigned short *) page;
		
		/*
		 *	The current code can't handle a driverless