cistpl.c

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/*
 * cistpl.c -- 16-bit PCMCIA Card Information Structure parser
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * The initial developer of the original code is David A. Hinds
 * <[e-mail]>.  Portions created by David A. Hinds
 * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 * (C) 1999		David A. Hinds
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/timer.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/byteorder.h>
#include <asm/unaligned.h>

#include <pcmcia/cs_types.h>
#include <pcmcia/ss.h>
#include <pcmcia/cs.h>
#include <pcmcia/bulkmem.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/cistpl.h>
#include "cs_internal.h"

static const u_char mantissa[] = {
    10, 12, 13, 15, 20, 25, 30, 35,
    40, 45, 50, 55, 60, 70, 80, 90
};

static const u_int exponent[] = {
    1, 10, 100, 1000, 10000, 100000, 1000000, 10000000
};

/* Convert an extended speed byte to a time in nanoseconds */
#define SPEED_CVT(v) \
    (mantissa[(((v)>>3)&15)-1] * exponent[(v)&7] / 10)
/* Convert a power byte to a current in 0.1 microamps */
#define POWER_CVT(v) \
    (mantissa[((v)>>3)&15] * exponent[(v)&7] / 10)
#define POWER_SCALE(v)		(exponent[(v)&7])

/* Upper limit on reasonable # of tuples */
#define MAX_TUPLES		200

/*====================================================================*/

/* Parameters that can be set with 'insmod' */

/* 16-bit CIS? */
static int cis_width;
module_param(cis_width, int, 0444);

void release_cis_mem(struct pcmcia_socket *s)
{
    if (s->cis_mem.flags & MAP_ACTIVE) {
	s->cis_mem.flags &= ~MAP_ACTIVE;
	s->ops->set_mem_map(s, &s->cis_mem);
	if (s->cis_mem.res) {
	    release_resource(s->cis_mem.res);
	    kfree(s->cis_mem.res);
	    s->cis_mem.res = NULL;
	}
	iounmap(s->cis_virt);
	s->cis_virt = NULL;
    }
}
EXPORT_SYMBOL(release_cis_mem);

/*
 * Map the card memory at "card_offset" into virtual space.
 * If flags & MAP_ATTRIB, map the attribute space, otherwise
 * map the memory space.
 */
static void __iomem *
set_cis_map(struct pcmcia_socket *s, unsigned int card_offset, unsigned int flags)
{
	pccard_mem_map *mem = &s->cis_mem;
	int ret;

	if (!(s->features & SS_CAP_STATIC_MAP) && (mem->res == NULL)) {
		mem->res = pcmcia_find_mem_region(0, s->map_size, s->map_size, 0, s);
		if (mem->res == NULL) {
			printk(KERN_NOTICE "cs: unable to map card memory!\n");
			return NULL;
		}
		s->cis_virt = NULL;
	}

	if (!(s->features & SS_CAP_STATIC_MAP) && (!s->cis_virt))
		s->cis_virt = ioremap(mem->res->start, s->map_size);

	mem->card_start = card_offset;
	mem->flags = flags;

	ret = s->ops->set_mem_map(s, mem);
	if (ret) {
		iounmap(s->cis_virt);
		s->cis_virt = NULL;
		return NULL;
	}

	if (s->features & SS_CAP_STATIC_MAP) {
		if (s->cis_virt)
			iounmap(s->cis_virt);
		s->cis_virt = ioremap(mem->static_start, s->map_size);
	}

	return s->cis_virt;
}

/*======================================================================

    Low-level functions to read and write CIS memory.  I think the
    write routine is only useful for writing one-byte registers.
    
======================================================================*/

/* Bits in attr field */
#define IS_ATTR		1
#define IS_INDIRECT	8

int pcmcia_read_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
		 u_int len, void *ptr)
{
    void __iomem *sys, *end;
    unsigned char *buf = ptr;
    
    cs_dbg(s, 3, "pcmcia_read_cis_mem(%d, %#x, %u)\n", attr, addr, len);

    if (attr & IS_INDIRECT) {
	/* Indirect accesses use a bunch of special registers at fixed
	   locations in common memory */
	u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
	if (attr & IS_ATTR) {
	    addr *= 2;
	    flags = ICTRL0_AUTOINC;
	}

	sys = set_cis_map(s, 0, MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0));
	if (!sys) {
	    memset(ptr, 0xff, len);
	    return -1;
	}

	writeb(flags, sys+CISREG_ICTRL0);
	writeb(addr & 0xff, sys+CISREG_IADDR0);
	writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
	writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
	writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
	for ( ; len > 0; len--, buf++)
	    *buf = readb(sys+CISREG_IDATA0);
    } else {
	u_int inc = 1, card_offset, flags;

	flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
	if (attr) {
	    flags |= MAP_ATTRIB;
	    inc++;
	    addr *= 2;
	}

	card_offset = addr & ~(s->map_size-1);
	while (len) {
	    sys = set_cis_map(s, card_offset, flags);
	    if (!sys) {
		memset(ptr, 0xff, len);
		return -1;
	    }
	    end = sys + s->map_size;
	    sys = sys + (addr & (s->map_size-1));
	    for ( ; len > 0; len--, buf++, sys += inc) {
		if (sys == end)
		    break;
		*buf = readb(sys);
	    }
	    card_offset += s->map_size;
	    addr = 0;
	}
    }
    cs_dbg(s, 3, "  %#2.2x %#2.2x %#2.2x %#2.2x ...\n",
	  *(u_char *)(ptr+0), *(u_char *)(ptr+1),
	  *(u_char *)(ptr+2), *(u_char *)(ptr+3));
    return 0;
}
EXPORT_SYMBOL(pcmcia_read_cis_mem);


void pcmcia_write_cis_mem(struct pcmcia_socket *s, int attr, u_int addr,
		   u_int len, void *ptr)
{
    void __iomem *sys, *end;
    unsigned char *buf = ptr;
    
    cs_dbg(s, 3, "pcmcia_write_cis_mem(%d, %#x, %u)\n", attr, addr, len);

    if (attr & IS_INDIRECT) {
	/* Indirect accesses use a bunch of special registers at fixed
	   locations in common memory */
	u_char flags = ICTRL0_COMMON|ICTRL0_AUTOINC|ICTRL0_BYTEGRAN;
	if (attr & IS_ATTR) {
	    addr *= 2;
	    flags = ICTRL0_AUTOINC;
	}

	sys = set_cis_map(s, 0, MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0));
	if (!sys)
		return; /* FIXME: Error */

	writeb(flags, sys+CISREG_ICTRL0);
	writeb(addr & 0xff, sys+CISREG_IADDR0);
	writeb((addr>>8) & 0xff, sys+CISREG_IADDR1);
	writeb((addr>>16) & 0xff, sys+CISREG_IADDR2);
	writeb((addr>>24) & 0xff, sys+CISREG_IADDR3);
	for ( ; len > 0; len--, buf++)
	    writeb(*buf, sys+CISREG_IDATA0);
    } else {
	u_int inc = 1, card_offset, flags;

	flags = MAP_ACTIVE | ((cis_width) ? MAP_16BIT : 0);
	if (attr & IS_ATTR) {
	    flags |= MAP_ATTRIB;
	    inc++;
	    addr *= 2;
	}

	card_offset = addr & ~(s->map_size-1);
	while (len) {
	    sys = set_cis_map(s, card_offset, flags);
	    if (!sys)
		return; /* FIXME: error */

	    end = sys + s->map_size;
	    sys = sys + (addr & (s->map_size-1));
	    for ( ; len > 0; len--, buf++, sys += inc) {
		if (sys == end)
		    break;
		writeb(*buf, sys);
	    }
	    card_offset += s->map_size;
	    addr = 0;
	}
    }
}
EXPORT_SYMBOL(pcmcia_write_cis_mem);


/*======================================================================

    This is a wrapper around read_cis_mem, with the same interface,
    but which caches information, for cards whose CIS may not be
    readable all the time.
    
======================================================================*/

static void read_cis_cache(struct pcmcia_socket *s, int attr, u_int addr,
			   u_int len, void *ptr)
{
    struct cis_cache_entry *cis;
    int ret;

    if (s->fake_cis) {
	if (s->fake_cis_len > addr+len)
	    memcpy(ptr, s->fake_cis+addr, len);
	else
	    memset(ptr, 0xff, len);
	return;
    }

    list_for_each_entry(cis, &s->cis_cache, node) {
	if (cis->addr == addr && cis->len == len && cis->attr == attr) {
	    memcpy(ptr, cis->cache, len);
	    return;
	}
    }

#ifdef CONFIG_CARDBUS
    if (s->state & SOCKET_CARDBUS)
	ret = read_cb_mem(s, attr, addr, len, ptr);
    else
#endif
	ret = pcmcia_read_cis_mem(s, attr, addr, len, ptr);

	if (ret == 0) {
		/* Copy data into the cache */
		cis = kmalloc(sizeof(struct cis_cache_entry) + len, GFP_KERNEL);
		if (cis) {
			cis->addr = addr;
			cis->len = len;
			cis->attr = attr;
			memcpy(cis->cache, ptr, len);
			list_add(&cis->node, &s->cis_cache);
		}
	}
}

static void
remove_cis_cache(struct pcmcia_socket *s, int attr, u_int addr, u_int len)
{
	struct cis_cache_entry *cis;

	list_for_each_entry(cis, &s->cis_cache, node)
		if (cis->addr == addr && cis->len == len && cis->attr == attr) {
			list_del(&cis->node);
			kfree(cis);
			break;
		}
}

void destroy_cis_cache(struct pcmcia_socket *s)
{
	struct list_head *l, *n;

	list_for_each_safe(l, n, &s->cis_cache) {
		struct cis_cache_entry *cis = list_entry(l, struct cis_cache_entry, node);

		list_del(&cis->node);
		kfree(cis);
	}

	/*
	 * If there was a fake CIS, destroy that as well.
	 */
	kfree(s->fake_cis);
	s->fake_cis = NULL;
}
EXPORT_SYMBOL(destroy_cis_cache);

/*======================================================================

    This verifies if the CIS of a card matches what is in the CIS
    cache.
    
======================================================================*/

int verify_cis_cache(struct pcmcia_socket *s)
{
	struct cis_cache_entry *cis;
	char *buf;

	buf = kmalloc(256, GFP_KERNEL);
	if (buf == NULL)
		return -1;
	list_for_each_entry(cis, &s->cis_cache, node) {
		int len = cis->len;

		if (len > 256)
			len = 256;
#ifdef CONFIG_CARDBUS
		if (s->state & SOCKET_CARDBUS)
			read_cb_mem(s, cis->attr, cis->addr, len, buf);
		else
#endif
			pcmcia_read_cis_mem(s, cis->attr, cis->addr, len, buf);

		if (memcmp(buf, cis->cache, len) != 0) {
			kfree(buf);
			return -1;
		}
	}
	kfree(buf);
	return 0;
}

/*======================================================================

    For really bad cards, we provide a facility for uploading a
    replacement CIS.
    
======================================================================*/

int pcmcia_replace_cis(struct pcmcia_socket *s, cisdump_t *cis)
{
    kfree(s->fake_cis);
    s->fake_cis = NULL;
    if (cis->Length > CISTPL_MAX_CIS_SIZE)
	return CS_BAD_SIZE;
    s->fake_cis = kmalloc(cis->Length, GFP_KERNEL);
    if (s->fake_cis == NULL)
	return CS_OUT_OF_RESOURCE;
    s->fake_cis_len = cis->Length;
    memcpy(s->fake_cis, cis->Data, cis->Length);
    return CS_SUCCESS;
}
EXPORT_SYMBOL(pcmcia_replace_cis);

/*======================================================================

    The high-level CIS tuple services
    
======================================================================*/

static inline u16 cis_get_u16(void *ptr)
{
	return le16_to_cpu(get_unaligned((__le16 *) ptr));
}
static inline u32 cis_get_u32(void *ptr)
{
	return le32_to_cpu(get_unaligned((__le32 *) ptr));
}

typedef struct tuple_flags {
    u_int		link_space:4;
    u_int		has_link:1;
    u_int		mfc_fn:3;
    u_int		space:4;
} tuple_flags;

#define LINK_SPACE(f)	(((tuple_flags *)(&(f)))->link_space)
#define HAS_LINK(f)	(((tuple_flags *)(&(f)))->has_link)
#define MFC_FN(f)	(((tuple_flags *)(&(f)))->mfc_fn)
#define SPACE(f)	(((tuple_flags *)(&(f)))->space)

int pccard_get_next_tuple(struct pcmcia_socket *s, unsigned int func, tuple_t *tuple);

int pccard_get_first_tuple(struct pcmcia_socket *s, unsigned int function, tuple_t *tuple)
{
    if (!s)
	return CS_BAD_HANDLE;
    if (!(s->state & SOCKET_PRESENT))
	return CS_NO_CARD;
    tuple->TupleLink = tuple->Flags = 0;
#ifdef CONFIG_CARDBUS
    if (s->state & SOCKET_CARDBUS) {
	struct pci_dev *dev = s->cb_dev;
	u_int ptr;
	pci_bus_read_config_dword(dev->subordinate, 0, PCI_CARDBUS_CIS, &ptr);
	tuple->CISOffset = ptr & ~7;
	SPACE(tuple->Flags) = (ptr & 7);
    } else
#endif
    {
	/* Assume presence of a LONGLINK_C to address 0 */
	tuple->CISOffset = tuple->LinkOffset = 0;
	SPACE(tuple->Flags) = HAS_LINK(tuple->Flags) = 1;
    }
    if (!(s->state & SOCKET_CARDBUS) && (s->functions > 1) &&
	!(tuple->Attributes & TUPLE_RETURN_COMMON)) {
	cisdata_t req = tuple->DesiredTuple;
	tuple->DesiredTuple = CISTPL_LONGLINK_MFC;
	if (pccard_get_next_tuple(s, function, tuple) == CS_SUCCESS) {
	    tuple->DesiredTuple = CISTPL_LINKTARGET;
	    if (pccard_get_next_tuple(s, function, tuple) != CS_SUCCESS)
		return CS_NO_MORE_ITEMS;
	} else
	    tuple->CISOffset = tuple->TupleLink = 0;
	tuple->DesiredTuple = req;
    }
    return pccard_get_next_tuple(s, function, tuple);
}
EXPORT_SYMBOL(pccard_get_first_tuple);

static int follow_link(struct pcmcia_socket *s, tuple_t *tuple)
{
    u_char link[5];
    u_int ofs;

    if (MFC_FN(tuple->Flags)) {
	/* Get indirect link from the MFC tuple */
	read_cis_cache(s, LINK_SPACE(tuple->Flags),
		       tuple->LinkOffset, 5, link);
	ofs = cis_get_u32(link + 1);
	SPACE(tuple->Flags) = (link[0] == CISTPL_MFC_ATTR);
	/* Move to the next indirect link */
	tuple->LinkOffset += 5;
	MFC_FN(tuple->Flags)--;
    } else if (HAS_LINK(tuple->Flags)) {
	ofs = tuple->LinkOffset;
	SPACE(tuple->Flags) = LINK_SPACE(tuple->Flags);
	HAS_LINK(tuple->Flags) = 0;
    } else {
	return -1;
    }
    if (!(s->state & SOCKET_CARDBUS) && SPACE(tuple->Flags)) {
	/* This is ugly, but a common CIS error is to code the long
	   link offset incorrectly, so we check the right spot... */
	read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
	if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
	    (strncmp(link+2, "CIS", 3) == 0))
	    return ofs;
	remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
	/* Then, we try the wrong spot... */
	ofs = ofs >> 1;
    }
    read_cis_cache(s, SPACE(tuple->Flags), ofs, 5, link);
    if ((link[0] == CISTPL_LINKTARGET) && (link[1] >= 3) &&
	(strncmp(link+2, "CIS", 3) == 0))
	return ofs;
    remove_cis_cache(s, SPACE(tuple->Flags), ofs, 5);
    return -1;
}