PCMCIA pcmcia_function_init, pcmcia_function_enable,
pcmcia_function_disable, pcmcia_io_alloc, pcmcia_io_free, pcmcia_io_map,
pcmcia_io_unmap, pcmcia_mem_alloc, pcmcia_mem_free, pcmcia_mem_map,
pcmcia_mem_unmap, pcmcia_intr_establish, pcmcia_intr_disestablish,
pcmcia_cis_read_1, pcmcia_cis_read_2, pcmcia_cis_read_3,
pcmcia_cis_read_4, pcmcia_cis_read_n, pcmcia_scan_cis - support for PCMCIA
PC-Card devices
#include <machine/bus.h>
#include <dev/pcmcia/pcmciareg.h>
#include <dev/pcmcia/pcmciavar.h>
#include <dev/pcmcia/pcmciadevs.h>
void
pcmcia_function_init(struct pcmcia_function *pf,
struct pcmcia_config_entry *cfe);
int
pcmcia_function_enable(struct pcmcia_function *pf);
void
pcmcia_function_disable(struct pcmcia_function *pf);
int
pcmcia_io_alloc(struct pcmcia_function *pf, bus_addr_t start,
bus_size_t size, bus_size_t align,
struct pcmcia_io_handle *pciop);
void
pcmcia_io_free(struct pcmcia_function *pf,
struct pcmcia_io_handle *pcihp);
int
pcmcia_io_map(struct pcmcia_function *pf, int width, bus_size_t offset,
bus_size_t size, struct pcmcia_io_handle *pcihp, int *windowp);
void
pcmcia_io_unmap(struct pcmcia_function *pf, int window);
int
pcmcia_mem_alloc(struct pcmcia_function *pf, bus_size_t size,
struct pcmcia_mem_handle *pcmhp);
void
pcmcia_mem_free(struct pcmcia_function *pf,
struct pcmcia_mem_handle *pcmhp);
int
pcmcia_mem_map(struct pcmcia_function *pf, int width,
bus_addr_t card_addr, bus_size_t size,
struct pcmcia_mem_handle *pcmhp, bus_size_t *offsetp,
int *windowp);
void
pcmcia_mem_unmap(struct pcmcia_function *pf, int window);
void *
pcmcia_intr_establish(struct pcmcia_function *pf, int level,
int (*handler)(void *), void *arg);
void
pcmcia_intr_disestablish(struct pcmcia_function *pf, void *ih);
u_int8_t
pcmcia_cis_read_1(struct pcmcia_tuple *tuple, int index);
u_int16_t
pcmcia_cis_read_2(struct pcmcia_tuple *tuple, int index);
u_int32_t
pcmcia_cis_read_3(struct pcmcia_tuple *tuple, int index);
u_int32_t
pcmcia_cis_read_4(struct pcmcia_tuple *tuple, int index);
u_int32_t
pcmcia_cis_read_n(struct pcmcia_tuple *tuple, int number, int index);
int
pcmcia_scan_cis(struct device *dev,
int (*func)(struct pcmcia_tuple *, void *), void *arg);;
The machine-independent PCMCIA subsystem provides support for PC-Card
devices defined by the Personal Computer Memory Card International Assocation
(PCMCIA). The PCMCIA bus supports insertion and removal of cards
while a system is powered-on (ie, dynamic reconfiguration). The socket
must be powered-off when a card is not present. To the user, this
appears as though the socket is "hot" during insertion and removal
events.
A PCMCIA controller interfaces the PCMCIA bus with the ISA or PCI busses
on the host system. The controller is responsible for detecting and
enabling devices and for allocating and mapping resources such as memory
and interrupts to devices on the PCMCIA bus.
Each device has a table called the Card Information Structure (CIS) which
contains configuration information. The tuples in the CIS are used by
the controller to uniquely identify the device. Additional information
may be present in the CIS, such as the ethernet MAC address, that can be
accessed and utilised within a device driver.
Devices on the PCMCIA bus are uniquely identified by a 32-bit manufacturer
ID and a 32-bit product ID. Additionally, devices can perform multiple
functions (such a ethernet and modem) and these functions are identified
by a function ID.
PCMCIA devices do not support DMA, however memory on the device can be
mapped into the address space of the host.
Drivers attached to the PCMCIA bus will make use of the following data
types:
struct pcmcia_card
Devices (cards) have their identity recorded in this structure.
It contains the following members:
char *cis1_info[4];
int32_t manufacturer;
int32_t product;
u_int16_t error;
SIMPLEQ_HEAD(, pcmcia_function) pf_head;
struct pcmcia_function
Identifies the function of the devices. A device can have multiple
functions. Consider it an opaque type for identifying a
particular function of a device.
struct pcmcia_config_entry
Contains information about the resources requested by the
device. It contains the following members:
int number;
u_int32_t flags;
int iftype;
int num_iospace;
u_long iomask;
struct {
u_long length;
u_long start;
} iospace[4];
u_int16_t irqmask;
int num_memspace;
struct {
u_long length;
u_long cardaddr;
u_long hostaddr;
} memspace[2];
int maxtwins;
SIMPLEQ_ENTRY(pcmcia_config_entry) cfe_list;
struct pcmcia_tuple
A handle for identifying an entry in the CIS.
struct pcmcia_io_handle
A handle for mapping and allocating I/O address spaces. It contains
the tag and handle for accessing the bus-space.
struct pcmcia_mem_handle
A handle for mapping and allocating memory address spaces. It
contains the tag and handle for accessing the bus-space.
struct pcmcia_attach_args
A structure used to inform the driver of the device properties.
It contains the following members:
int32_t manufacturer;
int32_t product;
struct pcmcia_card *card;
struct pcmcia_function *pf;
pcmcia_function_init(pf, cfe)
Initialise the machine-independent PCMCIA state with the config
entry cfe.
pcmcia_function_enable(pf)
Provide power to the socket containing the device specified by
device function pf.
pcmcia_function_disable(pf)
Remove power from the socket containing the device specified by
device function pf.
pcmcia_io_alloc(pf, start, size, align, pciop)
Request I/O space for device function pf at address start of
size size. Alignment is specified by align. A handle for the
I/O space is returned in pciop.
pcmcia_io_free(pf, pcihp)
Release I/O space with handle pcihp for device function pf.
pcmcia_io_map(pf, width, offset, size, pcihp, windowp)
Map device I/O for device function pf to the I/O space with handle
pcihp. An I/O window of size size is mapped at offset
offset in the chipset I/O window. The width of data access is
specified by width. Valid values for the width are:
PCMCIA_WIDTH_AUTO Use the largest I/O width reported by the
device.
PCMCIA_WIDTH_IO8 Force 8-bit I/O width.
PCMCIA_WIDTH_IO16 Force 16-bit I/O width.
A handle for the mapped I/O window is returned in windowp.
pcmcia_io_unmap(pf, window)
Unmap the I/O window window for device function pf.
pcmcia_mem_alloc(pf, size, pcmhp)
Request memory space for device function pf of size size. A
handle for the memory space is returned in pcmhp.
pcmcia_mem_free(pf, pcmhp)
Release memory space with handle pcmhp for device function pf.
pcmcia_mem_map(pf, width, card_addr, size, pcmhp, offsetp, windowp)
Map device memory for device function pf to the memory space
with handle pcmhp. The address of the device memory starts at
card_addr and is size size. The width of data access is specified
by width. Valid values for the width are:
PCMCIA_WIDTH_MEM8 Force 8-bit memory width.
PCMCIA_WIDTH_MEM16 Force 16-bit memory width.
A handle for the mapped memory window is returned in windowp and
a bus-space offset into the memory window is returned in
offsetp.
pcmcia_mem_unmap(pf, window)
Unmap the memory window window for device function pf.
pcmcia_intr_establish(pf, level, handler, arg)
Establish an interrupt handler for device function pf. The priority
of the interrupt is specified by level. When the interrupt
occurs the function handler is called with argument arg.
The return value is a handle for the interrupt handler.
pcmcia_intr_establish() returns an opaque handle to an event
descriptor if it succeeds, and returns NULL on failure.
pcmcia_intr_disestablish(pf, ih)
Dis-establish the interrupt handler for device function pf with
handle ih. The handle was returned from
pcmcia_intr_establish().
pcmcia_cis_read_1(tuple, index)
Read one byte from tuple tuple at index index in the CIS.
pcmcia_cis_read_2(tuple, index)
Read two bytes from tuple tuple at index index in the CIS.
pcmcia_cis_read_3(tuple, index)
Read three bytes from tuple tuple at index index in the CIS.
pcmcia_cis_read_4(tuple, index)
Read four bytes from tuple tuple at index index in the CIS.
pcmcia_cis_read_n(tuple, number, index)
Read n bytes from tuple tuple at index index in the CIS.
pcmcia_scan_cis(dev, func, arg)
Scan the CIS for device dev. For each tuple in the CIS, function
func is called with the tuple and the argument arg. func
should return 0 if the tuple it was called with is the one it
was looking for, or 1 otherwise.
During autoconfiguration, a PCMCIA driver will receive a pointer to
struct pcmcia_attach_args describing the device attached to the PCMCIA
bus. Drivers match the device using the manufacturer and product members.
During the driver attach step, drivers will use the pcmcia function pf.
The driver should traverse the list of config entries searching for a
useful configuration. This config entry is passed to
pcmcia_function_init() to initialise the machine-independent interface.
I/O and memory resources should be initialised using pcmcia_io_alloc()
and pcmcia_mem_alloc() using the specified resources in the config entry.
These resources can then be mapped into processor bus space using
pcmcia_io_map() and pcmcia_mem_map() respectively. Upon successful allocation
of resources, power can be applied to the device with
pcmcia_function_enable() so that device-specific interrogation can be
performed. Finally, power should be removed from the device using
pcmcia_function_disable().
Since PCMCIA devices support dynamic configuration, drivers should make
use of powerhook_establish(9). Power can be applied and the interrupt
handler should be established through this interface.
PCMCIA devices do not support DMA.
This section describes places within the NetBSD source tree where actual
code implementing or utilising the machine-independent PCMCIA subsystem
can be found. All pathnames are relative to /usr/src.
The PCMCIA subsystem itself is implemented within the file
sys/dev/pcmcia/pcmcia.c. The database of known devices exists within the
file sys/dev/pcmcia/pcmciadevs_data.h and is generated automatically from
the file sys/dev/pcmcia/pcmciadevs. New manufacturer and product identifiers
should be added to this file. The database can be regenerated
using the Makefile sys/dev/pcmcia/Makefile.pcmciadevs.
pcic(4), pcmcia(4), tcic(4), autoconf(9), bus_dma(9), bus_space(9),
driver(9)
Personal Computer Memory Card International Association (PCMCIA), PC Card
95 Standard, 1995.
The machine-independent PCMCIA subsystem appeared in NetBSD 1.3.
BSD June 4, 2001 BSD
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