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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-08-05 17:04:01 -0300
commit57f0f512b273f60d52568b8c6b77e17f5636edc0 (patch)
tree5e910f0e82173f4ef4f51111366a3f1299037a7b /Documentation/pcmcia
Initial import
Diffstat (limited to 'Documentation/pcmcia')
-rw-r--r--Documentation/pcmcia/.gitignore1
-rw-r--r--Documentation/pcmcia/Makefile7
-rw-r--r--Documentation/pcmcia/crc32hash.c32
-rw-r--r--Documentation/pcmcia/devicetable.txt33
-rw-r--r--Documentation/pcmcia/driver-changes.txt152
-rw-r--r--Documentation/pcmcia/driver.txt30
-rw-r--r--Documentation/pcmcia/locking.txt118
7 files changed, 373 insertions, 0 deletions
diff --git a/Documentation/pcmcia/.gitignore b/Documentation/pcmcia/.gitignore
new file mode 100644
index 000000000..53d081336
--- /dev/null
+++ b/Documentation/pcmcia/.gitignore
@@ -0,0 +1 @@
+crc32hash
diff --git a/Documentation/pcmcia/Makefile b/Documentation/pcmcia/Makefile
new file mode 100644
index 000000000..47a8fa162
--- /dev/null
+++ b/Documentation/pcmcia/Makefile
@@ -0,0 +1,7 @@
+# List of programs to build
+hostprogs-y := crc32hash
+
+# Tell kbuild to always build the programs
+always := $(hostprogs-y)
+
+HOSTCFLAGS_crc32hash.o += -I$(objtree)/usr/include
diff --git a/Documentation/pcmcia/crc32hash.c b/Documentation/pcmcia/crc32hash.c
new file mode 100644
index 000000000..44f8beea7
--- /dev/null
+++ b/Documentation/pcmcia/crc32hash.c
@@ -0,0 +1,32 @@
+/* crc32hash.c - derived from linux/lib/crc32.c, GNU GPL v2 */
+/* Usage example:
+$ ./crc32hash "Dual Speed"
+*/
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+#include <stdlib.h>
+
+static unsigned int crc32(unsigned char const *p, unsigned int len)
+{
+ int i;
+ unsigned int crc = 0;
+ while (len--) {
+ crc ^= *p++;
+ for (i = 0; i < 8; i++)
+ crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
+ }
+ return crc;
+}
+
+int main(int argc, char **argv) {
+ unsigned int result;
+ if (argc != 2) {
+ printf("no string passed as argument\n");
+ return -1;
+ }
+ result = crc32((unsigned char const *)argv[1], strlen(argv[1]));
+ printf("0x%x\n", result);
+ return 0;
+}
diff --git a/Documentation/pcmcia/devicetable.txt b/Documentation/pcmcia/devicetable.txt
new file mode 100644
index 000000000..199afd100
--- /dev/null
+++ b/Documentation/pcmcia/devicetable.txt
@@ -0,0 +1,33 @@
+Matching of PCMCIA devices to drivers is done using one or more of the
+following criteria:
+
+- manufactor ID
+- card ID
+- product ID strings _and_ hashes of these strings
+- function ID
+- device function (actual and pseudo)
+
+You should use the helpers in include/pcmcia/device_id.h for generating the
+struct pcmcia_device_id[] entries which match devices to drivers.
+
+If you want to match product ID strings, you also need to pass the crc32
+hashes of the string to the macro, e.g. if you want to match the product ID
+string 1, you need to use
+
+PCMCIA_DEVICE_PROD_ID1("some_string", 0x(hash_of_some_string)),
+
+If the hash is incorrect, the kernel will inform you about this in "dmesg"
+upon module initialization, and tell you of the correct hash.
+
+You can determine the hash of the product ID strings by catting the file
+"modalias" in the sysfs directory of the PCMCIA device. It generates a string
+in the following form:
+pcmcia:m0149cC1ABf06pfn00fn00pa725B842DpbF1EFEE84pc0877B627pd00000000
+
+The hex value after "pa" is the hash of product ID string 1, after "pb" for
+string 2 and so on.
+
+Alternatively, you can use crc32hash (see Documentation/pcmcia/crc32hash.c)
+to determine the crc32 hash. Simply pass the string you want to evaluate
+as argument to this program, e.g.:
+$ ./crc32hash "Dual Speed"
diff --git a/Documentation/pcmcia/driver-changes.txt b/Documentation/pcmcia/driver-changes.txt
new file mode 100644
index 000000000..dd04361dd
--- /dev/null
+++ b/Documentation/pcmcia/driver-changes.txt
@@ -0,0 +1,152 @@
+This file details changes in 2.6 which affect PCMCIA card driver authors:
+* pcmcia_loop_config() and autoconfiguration (as of 2.6.36)
+ If struct pcmcia_device *p_dev->config_flags is set accordingly,
+ pcmcia_loop_config() now sets up certain configuration values
+ automatically, though the driver may still override the settings
+ in the callback function. The following autoconfiguration options
+ are provided at the moment:
+ CONF_AUTO_CHECK_VCC : check for matching Vcc
+ CONF_AUTO_SET_VPP : set Vpp
+ CONF_AUTO_AUDIO : auto-enable audio line, if required
+ CONF_AUTO_SET_IO : set ioport resources (->resource[0,1])
+ CONF_AUTO_SET_IOMEM : set first iomem resource (->resource[2])
+
+* pcmcia_request_configuration -> pcmcia_enable_device (as of 2.6.36)
+ pcmcia_request_configuration() got renamed to pcmcia_enable_device(),
+ as it mirrors pcmcia_disable_device(). Configuration settings are now
+ stored in struct pcmcia_device, e.g. in the fields config_flags,
+ config_index, config_base, vpp.
+
+* pcmcia_request_window changes (as of 2.6.36)
+ Instead of win_req_t, drivers are now requested to fill out
+ struct pcmcia_device *p_dev->resource[2,3,4,5] for up to four ioport
+ ranges. After a call to pcmcia_request_window(), the regions found there
+ are reserved and may be used immediately -- until pcmcia_release_window()
+ is called.
+
+* pcmcia_request_io changes (as of 2.6.36)
+ Instead of io_req_t, drivers are now requested to fill out
+ struct pcmcia_device *p_dev->resource[0,1] for up to two ioport
+ ranges. After a call to pcmcia_request_io(), the ports found there
+ are reserved, after calling pcmcia_request_configuration(), they may
+ be used.
+
+* No dev_info_t, no cs_types.h (as of 2.6.36)
+ dev_info_t and a few other typedefs are removed. No longer use them
+ in PCMCIA device drivers. Also, do not include pcmcia/cs_types.h, as
+ this file is gone.
+
+* No dev_node_t (as of 2.6.35)
+ There is no more need to fill out a "dev_node_t" structure.
+
+* New IRQ request rules (as of 2.6.35)
+ Instead of the old pcmcia_request_irq() interface, drivers may now
+ choose between:
+ - calling request_irq/free_irq directly. Use the IRQ from *p_dev->irq.
+ - use pcmcia_request_irq(p_dev, handler_t); the PCMCIA core will
+ clean up automatically on calls to pcmcia_disable_device() or
+ device ejection.
+ - drivers still not capable of IRQF_SHARED (or not telling us so) may
+ use the deprecated pcmcia_request_exclusive_irq() for the time
+ being; they might receive a shared IRQ nonetheless.
+
+* no cs_error / CS_CHECK / CONFIG_PCMCIA_DEBUG (as of 2.6.33)
+ Instead of the cs_error() callback or the CS_CHECK() macro, please use
+ Linux-style checking of return values, and -- if necessary -- debug
+ messages using "dev_dbg()" or "pr_debug()".
+
+* New CIS tuple access (as of 2.6.33)
+ Instead of pcmcia_get_{first,next}_tuple(), pcmcia_get_tuple_data() and
+ pcmcia_parse_tuple(), a driver shall use "pcmcia_get_tuple()" if it is
+ only interested in one (raw) tuple, or "pcmcia_loop_tuple()" if it is
+ interested in all tuples of one type. To decode the MAC from CISTPL_FUNCE,
+ a new helper "pcmcia_get_mac_from_cis()" was added.
+
+* New configuration loop helper (as of 2.6.28)
+ By calling pcmcia_loop_config(), a driver can iterate over all available
+ configuration options. During a driver's probe() phase, one doesn't need
+ to use pcmcia_get_{first,next}_tuple, pcmcia_get_tuple_data and
+ pcmcia_parse_tuple directly in most if not all cases.
+
+* New release helper (as of 2.6.17)
+ Instead of calling pcmcia_release_{configuration,io,irq,win}, all that's
+ necessary now is calling pcmcia_disable_device. As there is no valid
+ reason left to call pcmcia_release_io and pcmcia_release_irq, the
+ exports for them were removed.
+
+* Unify detach and REMOVAL event code, as well as attach and INSERTION
+ code (as of 2.6.16)
+ void (*remove) (struct pcmcia_device *dev);
+ int (*probe) (struct pcmcia_device *dev);
+
+* Move suspend, resume and reset out of event handler (as of 2.6.16)
+ int (*suspend) (struct pcmcia_device *dev);
+ int (*resume) (struct pcmcia_device *dev);
+ should be initialized in struct pcmcia_driver, and handle
+ (SUSPEND == RESET_PHYSICAL) and (RESUME == CARD_RESET) events
+
+* event handler initialization in struct pcmcia_driver (as of 2.6.13)
+ The event handler is notified of all events, and must be initialized
+ as the event() callback in the driver's struct pcmcia_driver.
+
+* pcmcia/version.h should not be used (as of 2.6.13)
+ This file will be removed eventually.
+
+* in-kernel device<->driver matching (as of 2.6.13)
+ PCMCIA devices and their correct drivers can now be matched in
+ kernelspace. See 'devicetable.txt' for details.
+
+* Device model integration (as of 2.6.11)
+ A struct pcmcia_device is registered with the device model core,
+ and can be used (e.g. for SET_NETDEV_DEV) by using
+ handle_to_dev(client_handle_t * handle).
+
+* Convert internal I/O port addresses to unsigned int (as of 2.6.11)
+ ioaddr_t should be replaced by unsigned int in PCMCIA card drivers.
+
+* irq_mask and irq_list parameters (as of 2.6.11)
+ The irq_mask and irq_list parameters should no longer be used in
+ PCMCIA card drivers. Instead, it is the job of the PCMCIA core to
+ determine which IRQ should be used. Therefore, link->irq.IRQInfo2
+ is ignored.
+
+* client->PendingEvents is gone (as of 2.6.11)
+ client->PendingEvents is no longer available.
+
+* client->Attributes are gone (as of 2.6.11)
+ client->Attributes is unused, therefore it is removed from all
+ PCMCIA card drivers
+
+* core functions no longer available (as of 2.6.11)
+ The following functions have been removed from the kernel source
+ because they are unused by all in-kernel drivers, and no external
+ driver was reported to rely on them:
+ pcmcia_get_first_region()
+ pcmcia_get_next_region()
+ pcmcia_modify_window()
+ pcmcia_set_event_mask()
+ pcmcia_get_first_window()
+ pcmcia_get_next_window()
+
+* device list iteration upon module removal (as of 2.6.10)
+ It is no longer necessary to iterate on the driver's internal
+ client list and call the ->detach() function upon module removal.
+
+* Resource management. (as of 2.6.8)
+ Although the PCMCIA subsystem will allocate resources for cards,
+ it no longer marks these resources busy. This means that driver
+ authors are now responsible for claiming your resources as per
+ other drivers in Linux. You should use request_region() to mark
+ your IO regions in-use, and request_mem_region() to mark your
+ memory regions in-use. The name argument should be a pointer to
+ your driver name. Eg, for pcnet_cs, name should point to the
+ string "pcnet_cs".
+
+* CardServices is gone
+ CardServices() in 2.4 is just a big switch statement to call various
+ services. In 2.6, all of those entry points are exported and called
+ directly (except for pcmcia_report_error(), just use cs_error() instead).
+
+* struct pcmcia_driver
+ You need to use struct pcmcia_driver and pcmcia_{un,}register_driver
+ instead of {un,}register_pccard_driver
diff --git a/Documentation/pcmcia/driver.txt b/Documentation/pcmcia/driver.txt
new file mode 100644
index 000000000..0ac167920
--- /dev/null
+++ b/Documentation/pcmcia/driver.txt
@@ -0,0 +1,30 @@
+PCMCIA Driver
+-------------
+
+
+sysfs
+-----
+
+New PCMCIA IDs may be added to a device driver pcmcia_device_id table at
+runtime as shown below:
+
+echo "match_flags manf_id card_id func_id function device_no \
+prod_id_hash[0] prod_id_hash[1] prod_id_hash[2] prod_id_hash[3]" > \
+/sys/bus/pcmcia/drivers/{driver}/new_id
+
+All fields are passed in as hexadecimal values (no leading 0x).
+The meaning is described in the PCMCIA specification, the match_flags is
+a bitwise or-ed combination from PCMCIA_DEV_ID_MATCH_* constants
+defined in include/linux/mod_devicetable.h.
+
+Once added, the driver probe routine will be invoked for any unclaimed
+PCMCIA device listed in its (newly updated) pcmcia_device_id list.
+
+A common use-case is to add a new device according to the manufacturer ID
+and the card ID (form the manf_id and card_id file in the device tree).
+For this, just use:
+
+echo "0x3 manf_id card_id 0 0 0 0 0 0 0" > \
+ /sys/bus/pcmcia/drivers/{driver}/new_id
+
+after loading the driver.
diff --git a/Documentation/pcmcia/locking.txt b/Documentation/pcmcia/locking.txt
new file mode 100644
index 000000000..68f622bc4
--- /dev/null
+++ b/Documentation/pcmcia/locking.txt
@@ -0,0 +1,118 @@
+This file explains the locking and exclusion scheme used in the PCCARD
+and PCMCIA subsystems.
+
+
+A) Overview, Locking Hierarchy:
+===============================
+
+pcmcia_socket_list_rwsem - protects only the list of sockets
+- skt_mutex - serializes card insert / ejection
+ - ops_mutex - serializes socket operation
+
+
+B) Exclusion
+============
+
+The following functions and callbacks to struct pcmcia_socket must
+be called with "skt_mutex" held:
+
+ socket_detect_change()
+ send_event()
+ socket_reset()
+ socket_shutdown()
+ socket_setup()
+ socket_remove()
+ socket_insert()
+ socket_early_resume()
+ socket_late_resume()
+ socket_resume()
+ socket_suspend()
+
+ struct pcmcia_callback *callback
+
+The following functions and callbacks to struct pcmcia_socket must
+be called with "ops_mutex" held:
+
+ socket_reset()
+ socket_setup()
+
+ struct pccard_operations *ops
+ struct pccard_resource_ops *resource_ops;
+
+Note that send_event() and struct pcmcia_callback *callback must not be
+called with "ops_mutex" held.
+
+
+C) Protection
+=============
+
+1. Global Data:
+---------------
+struct list_head pcmcia_socket_list;
+
+protected by pcmcia_socket_list_rwsem;
+
+
+2. Per-Socket Data:
+-------------------
+The resource_ops and their data are protected by ops_mutex.
+
+The "main" struct pcmcia_socket is protected as follows (read-only fields
+or single-use fields not mentioned):
+
+- by pcmcia_socket_list_rwsem:
+ struct list_head socket_list;
+
+- by thread_lock:
+ unsigned int thread_events;
+
+- by skt_mutex:
+ u_int suspended_state;
+ void (*tune_bridge);
+ struct pcmcia_callback *callback;
+ int resume_status;
+
+- by ops_mutex:
+ socket_state_t socket;
+ u_int state;
+ u_short lock_count;
+ pccard_mem_map cis_mem;
+ void __iomem *cis_virt;
+ struct { } irq;
+ io_window_t io[];
+ pccard_mem_map win[];
+ struct list_head cis_cache;
+ size_t fake_cis_len;
+ u8 *fake_cis;
+ u_int irq_mask;
+ void (*zoom_video);
+ int (*power_hook);
+ u8 resource...;
+ struct list_head devices_list;
+ u8 device_count;
+ struct pcmcia_state;
+
+
+3. Per PCMCIA-device Data:
+--------------------------
+
+The "main" struct pcmcia_devie is protected as follows (read-only fields
+or single-use fields not mentioned):
+
+
+- by pcmcia_socket->ops_mutex:
+ struct list_head socket_device_list;
+ struct config_t *function_config;
+ u16 _irq:1;
+ u16 _io:1;
+ u16 _win:4;
+ u16 _locked:1;
+ u16 allow_func_id_match:1;
+ u16 suspended:1;
+ u16 _removed:1;
+
+- by the PCMCIA driver:
+ io_req_t io;
+ irq_req_t irq;
+ config_req_t conf;
+ window_handle_t win;