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linux/include/pcmcia/ss.h
Dominik Brodowski 04de081617 pcmcia: pcmcia_dev_present bugfix 
pcmcia_dev_present is in and by itself buggy. Add a note specifying
why it is broken, and replace the broken locking -- taking a mutex
is a bad idea in IRQ context, from which this function is rarely
called -- by an atomic_t.

Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2010-04-21 08:09:17 +02:00

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/*
* ss.h
*
* 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
* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
*
* (C) 1999 David A. Hinds
*/
#ifndef _LINUX_SS_H
#define _LINUX_SS_H
#include <linux/device.h>
#include <linux/sched.h> /* task_struct, completion */
#include <linux/mutex.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.h>
#ifdef CONFIG_CARDBUS
#include <linux/pci.h>
#endif
/* Definitions for card status flags for GetStatus */
#define SS_WRPROT 0x0001
#define SS_CARDLOCK 0x0002
#define SS_EJECTION 0x0004
#define SS_INSERTION 0x0008
#define SS_BATDEAD 0x0010
#define SS_BATWARN 0x0020
#define SS_READY 0x0040
#define SS_DETECT 0x0080
#define SS_POWERON 0x0100
#define SS_GPI 0x0200
#define SS_STSCHG 0x0400
#define SS_CARDBUS 0x0800
#define SS_3VCARD 0x1000
#define SS_XVCARD 0x2000
#define SS_PENDING 0x4000
#define SS_ZVCARD 0x8000
/* InquireSocket capabilities */
#define SS_CAP_PAGE_REGS 0x0001
#define SS_CAP_VIRTUAL_BUS 0x0002
#define SS_CAP_MEM_ALIGN 0x0004
#define SS_CAP_STATIC_MAP 0x0008
#define SS_CAP_PCCARD 0x4000
#define SS_CAP_CARDBUS 0x8000
/* for GetSocket, SetSocket */
typedef struct socket_state_t {
u_int flags;
u_int csc_mask;
u_char Vcc, Vpp;
u_char io_irq;
} socket_state_t;
extern socket_state_t dead_socket;
/* Socket configuration flags */
#define SS_PWR_AUTO 0x0010
#define SS_IOCARD 0x0020
#define SS_RESET 0x0040
#define SS_DMA_MODE 0x0080
#define SS_SPKR_ENA 0x0100
#define SS_OUTPUT_ENA 0x0200
/* Flags for I/O port and memory windows */
#define MAP_ACTIVE 0x01
#define MAP_16BIT 0x02
#define MAP_AUTOSZ 0x04
#define MAP_0WS 0x08
#define MAP_WRPROT 0x10
#define MAP_ATTRIB 0x20
#define MAP_USE_WAIT 0x40
#define MAP_PREFETCH 0x80
/* Use this just for bridge windows */
#define MAP_IOSPACE 0x20
/* power hook operations */
#define HOOK_POWER_PRE 0x01
#define HOOK_POWER_POST 0x02
typedef struct pccard_io_map {
u_char map;
u_char flags;
u_short speed;
phys_addr_t start, stop;
} pccard_io_map;
typedef struct pccard_mem_map {
u_char map;
u_char flags;
u_short speed;
phys_addr_t static_start;
u_int card_start;
struct resource *res;
} pccard_mem_map;
typedef struct io_window_t {
u_int InUse, Config;
struct resource *res;
} io_window_t;
/* Maximum number of IO windows per socket */
#define MAX_IO_WIN 2
/* Maximum number of memory windows per socket */
#define MAX_WIN 4
/*
* Socket operations.
*/
struct pcmcia_socket;
struct pccard_resource_ops;
struct config_t;
struct pcmcia_callback;
struct user_info_t;
struct pccard_operations {
int (*init)(struct pcmcia_socket *s);
int (*suspend)(struct pcmcia_socket *s);
int (*get_status)(struct pcmcia_socket *s, u_int *value);
int (*set_socket)(struct pcmcia_socket *s, socket_state_t *state);
int (*set_io_map)(struct pcmcia_socket *s, struct pccard_io_map *io);
int (*set_mem_map)(struct pcmcia_socket *s, struct pccard_mem_map *mem);
};
struct pcmcia_socket {
struct module *owner;
socket_state_t socket;
u_int state;
u_int suspended_state; /* state before suspend */
u_short functions;
u_short lock_count;
pccard_mem_map cis_mem;
void __iomem *cis_virt;
struct {
u_int AssignedIRQ;
u_int Config;
} irq;
io_window_t io[MAX_IO_WIN];
pccard_mem_map win[MAX_WIN];
struct list_head cis_cache;
size_t fake_cis_len;
u8 *fake_cis;
struct list_head socket_list;
struct completion socket_released;
/* deprecated */
unsigned int sock; /* socket number */
/* socket capabilities */
u_int features;
u_int irq_mask;
u_int map_size;
u_int io_offset;
u_int pci_irq;
struct pci_dev *cb_dev;
/* socket setup is done so resources should be able to be allocated.
* Only if set to 1, calls to find_{io,mem}_region are handled, and
* insertio events are actually managed by the PCMCIA layer.*/
u8 resource_setup_done:1;
/* It's old if resource setup is done using adjust_resource_info() */
u8 resource_setup_old:1;
u8 resource_setup_new:1;
u8 reserved:5;
/* socket operations */
struct pccard_operations *ops;
struct pccard_resource_ops *resource_ops;
void *resource_data;
/* Zoom video behaviour is so chip specific its not worth adding
this to _ops */
void (*zoom_video)(struct pcmcia_socket *,
int);
/* so is power hook */
int (*power_hook)(struct pcmcia_socket *sock, int operation);
/* allows tuning the CB bridge before loading driver for the CB card */
#ifdef CONFIG_CARDBUS
void (*tune_bridge)(struct pcmcia_socket *sock, struct pci_bus *bus);
#endif
/* state thread */
struct task_struct *thread;
struct completion thread_done;
unsigned int thread_events;
unsigned int sysfs_events;
/* For the non-trivial interaction between these locks,
* see Documentation/pcmcia/locking.txt */
struct mutex skt_mutex;
struct mutex ops_mutex;
/* protects thread_events and sysfs_events */
spinlock_t thread_lock;
/* pcmcia (16-bit) */
struct pcmcia_callback *callback;
#if defined(CONFIG_PCMCIA) || defined(CONFIG_PCMCIA_MODULE)
/* The following elements refer to 16-bit PCMCIA devices inserted
* into the socket */
struct list_head devices_list;
/* the number of devices, used only internally and subject to
* incorrectness and change */
u8 device_count;
/* 16-bit state: */
struct {
/* "master" ioctl is used */
u8 busy:1;
/* the PCMCIA card consists of two pseudo devices */
u8 has_pfc:1;
u8 reserved:6;
} pcmcia_state;
/* non-zero if PCMCIA card is present */
atomic_t present;
#ifdef CONFIG_PCMCIA_IOCTL
struct user_info_t *user;
wait_queue_head_t queue;
#endif /* CONFIG_PCMCIA_IOCTL */
#endif /* CONFIG_PCMCIA */
/* socket device */
struct device dev;
/* data internal to the socket driver */
void *driver_data;
/* status of the card during resume from a system sleep state */
int resume_status;
};
/* socket drivers must define the resource operations type they use. There
* are three options:
* - pccard_static_ops iomem and ioport areas are assigned statically
* - pccard_iodyn_ops iomem areas is assigned statically, ioport
* areas dynamically
* If this option is selected, use
* "select PCCARD_IODYN" in Kconfig.
* - pccard_nonstatic_ops iomem and ioport areas are assigned dynamically.
* If this option is selected, use
* "select PCCARD_NONSTATIC" in Kconfig.
*
*/
extern struct pccard_resource_ops pccard_static_ops;
#if defined(CONFIG_PCMCIA) || defined(CONFIG_PCMCIA_MODULE)
extern struct pccard_resource_ops pccard_iodyn_ops;
extern struct pccard_resource_ops pccard_nonstatic_ops;
#else
/* If PCMCIA is not used, but only CARDBUS, these functions are not used
* at all. Therefore, do not use the large (240K!) rsrc_nonstatic module
*/
#define pccard_iodyn_ops pccard_static_ops
#define pccard_nonstatic_ops pccard_static_ops
#endif
/* socket drivers use this callback in their IRQ handler */
extern void pcmcia_parse_events(struct pcmcia_socket *socket,
unsigned int events);
/* to register and unregister a socket */
extern int pcmcia_register_socket(struct pcmcia_socket *socket);
extern void pcmcia_unregister_socket(struct pcmcia_socket *socket);
#endif /* _LINUX_SS_H */
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