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staging: octeon-usb: merge cvmx-usb into octeon-hcd

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cvmx-usb module provided Cavium "OS abstraction layer" for USB
functionality. To make this driver a proper Linux driver, we need to
refactor this layer out. By making all the code internal to the HCD
driver makes this task easier.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aaro Koskinen 2013-10-06 22:22:24 +03:00 committed by Greg Kroah-Hartman
parent 02ab343f3b
commit 6570b4a991
4 changed files with 3417 additions and 3711 deletions
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4
drivers/staging/octeon-usb/Makefile
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obj-${CONFIG_OCTEON_USB} := octeon-usb.o
octeon-usb-y := octeon-hcd.o
octeon-usb-y += cvmx-usb.o
obj-${CONFIG_OCTEON_USB} := octeon-hcd.o

3186
drivers/staging/octeon-usb/cvmx-usb.c
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521
drivers/staging/octeon-usb/cvmx-usb.h
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/***********************license start***************
* Copyright (c) 2003-2010 Cavium Networks (support@cavium.com). All rights
* reserved.
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of Cavium Networks nor the names of
* its contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
* This Software, including technical data, may be subject to U.S. export
* control laws, including the U.S. Export Administration Act and its associated
* regulations, and may be subject to export or import regulations in other
* countries.
* TO THE MAXIMUM EXTENT PERMITTED BY LAW, THE SOFTWARE IS PROVIDED "AS IS"
* AND WITH ALL FAULTS AND CAVIUM NETWORKS MAKES NO PROMISES, REPRESENTATIONS OR
* WARRANTIES, EITHER EXPRESS, IMPLIED, STATUTORY, OR OTHERWISE, WITH RESPECT TO
* THE SOFTWARE, INCLUDING ITS CONDITION, ITS CONFORMITY TO ANY REPRESENTATION
* OR DESCRIPTION, OR THE EXISTENCE OF ANY LATENT OR PATENT DEFECTS, AND CAVIUM
* SPECIFICALLY DISCLAIMS ALL IMPLIED (IF ANY) WARRANTIES OF TITLE,
* MERCHANTABILITY, NONINFRINGEMENT, FITNESS FOR A PARTICULAR PURPOSE, LACK OF
* VIRUSES, ACCURACY OR COMPLETENESS, QUIET ENJOYMENT, QUIET POSSESSION OR
* CORRESPONDENCE TO DESCRIPTION. THE ENTIRE RISK ARISING OUT OF USE OR
* PERFORMANCE OF THE SOFTWARE LIES WITH YOU.
***********************license end**************************************/
/**
* "cvmx-usb.h" defines a set of low level USB functions to help
* developers create Octeon USB drivers for various operating
* systems. These functions provide a generic API to the Octeon
* USB blocks, hiding the internal hardware specific
* operations.
*
* At a high level the device driver needs to:
*
* - Call cvmx_usb_get_num_ports() to get the number of
* supported ports.
* - Call cvmx_usb_initialize() for each Octeon USB port.
* - Enable the port using cvmx_usb_enable().
* - Either periodically, or in an interrupt handler, call
* cvmx_usb_poll() to service USB events.
* - Manage pipes using cvmx_usb_open_pipe() and
* cvmx_usb_close_pipe().
* - Manage transfers using cvmx_usb_submit_*() and
* cvmx_usb_cancel*().
* - Shutdown USB on unload using cvmx_usb_shutdown().
*
* To monitor USB status changes, the device driver must use
* cvmx_usb_register_callback() to register for events that it
* is interested in. Below are a few hints on successfully
* implementing a driver on top of this API.
*
* == Initialization ==
*
* When a driver is first loaded, it is normally not necessary
* to bring up the USB port completely. Most operating systems
* expect to initialize and enable the port in two independent
* steps. Normally an operating system will probe hardware,
* initialize anything found, and then enable the hardware.
*
* In the probe phase you should:
* - Use cvmx_usb_get_num_ports() to determine the number of
* USB port to be supported.
* - Allocate space for a struct cvmx_usb_state for each
* port.
* - Tell the operating system about each port
*
* In the initialization phase you should:
* - Use cvmx_usb_initialize() on each port.
* - Do not call cvmx_usb_enable(). This leaves the USB port in
* the disabled state until the operating system is ready.
*
* Finally, in the enable phase you should:
* - Call cvmx_usb_enable() on the appropriate port.
* - Note that some operating system use a RESET instead of an
* enable call. To implement RESET, you should call
* cvmx_usb_disable() followed by cvmx_usb_enable().
*
* == Locking ==
*
* All of the functions in the cvmx-usb API assume exclusive
* access to the USB hardware and internal data structures. This
* means that the driver must provide locking as necessary.
*
* In the single CPU state it is normally enough to disable
* interrupts before every call to cvmx_usb*() and enable them
* again after the call is complete. Keep in mind that it is
* very common for the callback handlers to make additional
* calls into cvmx-usb, so the disable/enable must be protected
* against recursion. As an example, the Linux kernel
* local_irq_save() and local_irq_restore() are perfect for this
* in the non SMP case.
*
* In the SMP case, locking is more complicated. For SMP you not
* only need to disable interrupts on the local core, but also
* take a lock to make sure that another core cannot call
* cvmx-usb.
*
* == Port callback ==
*
* The port callback prototype needs to look as follows:
*
* void port_callback(struct cvmx_usb_state *usb,
* enum cvmx_usb_callback reason,
* enum cvmx_usb_complete status,
* int pipe_handle,
* int submit_handle,
* int bytes_transferred,
* void *user_data);
* - "usb" is the struct cvmx_usb_state for the port.
* - "reason" will always be CVMX_USB_CALLBACK_PORT_CHANGED.
* - "status" will always be CVMX_USB_COMPLETE_SUCCESS.
* - "pipe_handle" will always be -1.
* - "submit_handle" will always be -1.
* - "bytes_transferred" will always be 0.
* - "user_data" is the void pointer originally passed along
* with the callback. Use this for any state information you
* need.
*
* The port callback will be called whenever the user plugs /
* unplugs a device from the port. It will not be called when a
* device is plugged / unplugged from a hub connected to the
* root port. Normally all the callback needs to do is tell the
* operating system to poll the root hub for status. Under
* Linux, this is performed by calling usb_hcd_poll_rh_status().
* In the Linux driver we use "user_data". to pass around the
* Linux "hcd" structure. Once the port callback completes,
* Linux automatically calls octeon_usb_hub_status_data() which
* uses cvmx_usb_get_status() to determine the root port status.
*
* == Complete callback ==
*
* The completion callback prototype needs to look as follows:
*
* void complete_callback(struct cvmx_usb_state *usb,
* enum cvmx_usb_callback reason,
* enum cvmx_usb_complete status,
* int pipe_handle,
* int submit_handle,
* int bytes_transferred,
* void *user_data);
* - "usb" is the struct cvmx_usb_state for the port.
* - "reason" will always be CVMX_USB_CALLBACK_TRANSFER_COMPLETE.
* - "status" will be one of the cvmx_usb_complete enumerations.
* - "pipe_handle" is the handle to the pipe the transaction
* was originally submitted on.
* - "submit_handle" is the handle returned by the original
* cvmx_usb_submit_* call.
* - "bytes_transferred" is the number of bytes successfully
* transferred in the transaction. This will be zero on most
* error conditions.
* - "user_data" is the void pointer originally passed along
* with the callback. Use this for any state information you
* need. For example, the Linux "urb" is stored in here in the
* Linux driver.
*
* In general your callback handler should use "status" and
* "bytes_transferred" to tell the operating system the how the
* transaction completed. Normally the pipe is not changed in
* this callback.
*
* == Canceling transactions ==
*
* When a transaction is cancelled using cvmx_usb_cancel*(), the
* actual length of time until the complete callback is called
* can vary greatly. It may be called before cvmx_usb_cancel*()
* returns, or it may be called a number of usb frames in the
* future once the hardware frees the transaction. In either of
* these cases, the complete handler will receive
* CVMX_USB_COMPLETE_CANCEL.
*
* == Handling pipes ==
*
* USB "pipes" is a software construct created by this API to
* enable the ordering of usb transactions to a device endpoint.
* Octeon's underlying hardware doesn't have any concept
* equivalent to "pipes". The hardware instead has eight
* channels that can be used simultaneously to have up to eight
* transaction in process at the same time. In order to maintain
* ordering in a pipe, the transactions for a pipe will only be
* active in one hardware channel at a time. From an API user's
* perspective, this doesn't matter but it can be helpful to
* keep this in mind when you are probing hardware while
* debugging.
*
* Also keep in mind that usb transactions contain state
* information about the previous transaction to the same
* endpoint. Each transaction has a PID toggle that changes 0/1
* between each sub packet. This is maintained in the pipe data
* structures. For this reason, you generally cannot create and
* destroy a pipe for every transaction. A sequence of
* transaction to the same endpoint must use the same pipe.
*
* == Root Hub ==
*
* Some operating systems view the usb root port as a normal usb
* hub. These systems attempt to control the root hub with
* messages similar to the usb 2.0 spec for hub control and
* status. For these systems it may be necessary to write
* function to decode standard usb control messages into
* equivalent cvmx-usb API calls.
*
* == Interrupts ==
*
* If you plan on using usb interrupts, cvmx_usb_poll() must be
* called on every usb interrupt. It will read the usb state,
* call any needed callbacks, and schedule transactions as
* needed. Your device driver needs only to hookup an interrupt
* handler and call cvmx_usb_poll(). Octeon's usb port 0 causes
* CIU bit CIU_INT*_SUM0[USB] to be set (bit 56). For port 1,
* CIU bit CIU_INT_SUM1[USB1] is set (bit 17). How these bits
* are turned into interrupt numbers is operating system
* specific. For Linux, there are the convenient defines
* OCTEON_IRQ_USB0 and OCTEON_IRQ_USB1 for the IRQ numbers.
*
* If you aren't using interrupts, simple call cvmx_usb_poll()
* in your main processing loop.
*/
#ifndef __CVMX_USB_H__
#define __CVMX_USB_H__
/**
* enum cvmx_usb_speed - the possible USB device speeds
*
* @CVMX_USB_SPEED_HIGH: Device is operation at 480Mbps
* @CVMX_USB_SPEED_FULL: Device is operation at 12Mbps
* @CVMX_USB_SPEED_LOW: Device is operation at 1.5Mbps
*/
enum cvmx_usb_speed {
CVMX_USB_SPEED_HIGH = 0,
CVMX_USB_SPEED_FULL = 1,
CVMX_USB_SPEED_LOW = 2,
};
/**
* enum cvmx_usb_transfer - the possible USB transfer types
*
* @CVMX_USB_TRANSFER_CONTROL: USB transfer type control for hub and status
* transfers
* @CVMX_USB_TRANSFER_ISOCHRONOUS: USB transfer type isochronous for low
* priority periodic transfers
* @CVMX_USB_TRANSFER_BULK: USB transfer type bulk for large low priority
* transfers
* @CVMX_USB_TRANSFER_INTERRUPT: USB transfer type interrupt for high priority
* periodic transfers
*/
enum cvmx_usb_transfer {
CVMX_USB_TRANSFER_CONTROL = 0,
CVMX_USB_TRANSFER_ISOCHRONOUS = 1,
CVMX_USB_TRANSFER_BULK = 2,
CVMX_USB_TRANSFER_INTERRUPT = 3,
};
/**
* enum cvmx_usb_direction - the transfer directions
*
* @CVMX_USB_DIRECTION_OUT: Data is transferring from Octeon to the device/host
* @CVMX_USB_DIRECTION_IN: Data is transferring from the device/host to Octeon
*/
enum cvmx_usb_direction {
CVMX_USB_DIRECTION_OUT,
CVMX_USB_DIRECTION_IN,
};
/**
* enum cvmx_usb_complete - possible callback function status codes
*
* @CVMX_USB_COMPLETE_SUCCESS: The transaction / operation finished without
* any errors
* @CVMX_USB_COMPLETE_SHORT: FIXME: This is currently not implemented
* @CVMX_USB_COMPLETE_CANCEL: The transaction was canceled while in flight
* by a user call to cvmx_usb_cancel
* @CVMX_USB_COMPLETE_ERROR: The transaction aborted with an unexpected
* error status
* @CVMX_USB_COMPLETE_STALL: The transaction received a USB STALL response
* from the device
* @CVMX_USB_COMPLETE_XACTERR: The transaction failed with an error from the
* device even after a number of retries
* @CVMX_USB_COMPLETE_DATATGLERR: The transaction failed with a data toggle
* error even after a number of retries
* @CVMX_USB_COMPLETE_BABBLEERR: The transaction failed with a babble error
* @CVMX_USB_COMPLETE_FRAMEERR: The transaction failed with a frame error
* even after a number of retries
*/
enum cvmx_usb_complete {
CVMX_USB_COMPLETE_SUCCESS,
CVMX_USB_COMPLETE_SHORT,
CVMX_USB_COMPLETE_CANCEL,
CVMX_USB_COMPLETE_ERROR,
CVMX_USB_COMPLETE_STALL,
CVMX_USB_COMPLETE_XACTERR,
CVMX_USB_COMPLETE_DATATGLERR,
CVMX_USB_COMPLETE_BABBLEERR,
CVMX_USB_COMPLETE_FRAMEERR,
};
/**
* struct cvmx_usb_port_status - the USB port status information
*
* @port_enabled: 1 = Usb port is enabled, 0 = disabled
* @port_over_current: 1 = Over current detected, 0 = Over current not
* detected. Octeon doesn't support over current detection.
* @port_powered: 1 = Port power is being supplied to the device, 0 =
* power is off. Octeon doesn't support turning port power
* off.
* @port_speed: Current port speed.
* @connected: 1 = A device is connected to the port, 0 = No device is
* connected.
* @connect_change: 1 = Device connected state changed since the last set
* status call.
*/
struct cvmx_usb_port_status {
uint32_t reserved : 25;
uint32_t port_enabled : 1;
uint32_t port_over_current : 1;
uint32_t port_powered : 1;
enum cvmx_usb_speed port_speed : 2;
uint32_t connected : 1;
uint32_t connect_change : 1;
};
/**
* union cvmx_usb_control_header - the structure of a Control packet header
*
* @s.request_type: Bit 7 tells the direction: 1=IN, 0=OUT
* @s.request The standard usb request to make
* @s.value Value parameter for the request in little endian format
* @s.index Index for the request in little endian format
* @s.length Length of the data associated with this request in
* little endian format
*/
union cvmx_usb_control_header {
uint64_t u64;
struct {
uint64_t request_type : 8;
uint64_t request : 8;
uint64_t value : 16;
uint64_t index : 16;
uint64_t length : 16;
} s;
};
/**
* struct cvmx_usb_iso_packet - descriptor for Isochronous packets
*
* @offset: This is the offset in bytes into the main buffer where this data
* is stored.
* @length: This is the length in bytes of the data.
* @status: This is the status of this individual packet transfer.
*/
struct cvmx_usb_iso_packet {
int offset;
int length;
enum cvmx_usb_complete status;
};
/**
* enum cvmx_usb_callback - possible callback reasons for the USB API
*
* @CVMX_USB_CALLBACK_TRANSFER_COMPLETE: A callback of this type is called when
* a submitted transfer completes. The
* completion callback will be called even
* if the transfer fails or is canceled.
* The status parameter will contain
* details of why he callback was called.
* @CVMX_USB_CALLBACK_PORT_CHANGED: The status of the port changed. For
* example, someone may have plugged a
* device in. The status parameter
* contains CVMX_USB_COMPLETE_SUCCESS. Use
* cvmx_usb_get_status() to get the new
* port status.
* @__CVMX_USB_CALLBACK_END: Do not use. Used internally for array
* bounds.
*/
enum cvmx_usb_callback {
CVMX_USB_CALLBACK_TRANSFER_COMPLETE,
CVMX_USB_CALLBACK_PORT_CHANGED,
__CVMX_USB_CALLBACK_END
};
/**
* USB state internal data. The contents of this structure
* may change in future SDKs. No data in it should be referenced
* by user's of this API.
*/
struct cvmx_usb_state {
char data[65536];
};
/**
* USB callback functions are always of the following type.
* The parameters are as follows:
* - state = USB device state populated by
* cvmx_usb_initialize().
* - reason = The enum cvmx_usb_callback used to register
* the callback.
* - status = The enum cvmx_usb_complete representing the
* status code of a transaction.
* - pipe_handle = The Pipe that caused this callback, or
* -1 if this callback wasn't associated with a pipe.
* - submit_handle = Transfer submit handle causing this
* callback, or -1 if this callback wasn't associated
* with a transfer.
* - Actual number of bytes transfer.
* - user_data = The user pointer supplied to the
* function cvmx_usb_submit() or
* cvmx_usb_register_callback() */
typedef void (*cvmx_usb_callback_func_t)(struct cvmx_usb_state *state,
enum cvmx_usb_callback reason,
enum cvmx_usb_complete status,
int pipe_handle, int submit_handle,
int bytes_transferred, void *user_data);
/**
* enum cvmx_usb_initialize_flags - flags used by the initialization function
*
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI: The USB port uses a 12MHz crystal
* as clock source at USB_XO and
* USB_XI.
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND: The USB port uses 12/24/48MHz 2.5V
* board clock source at USB_XO.
* USB_XI should be tied to GND.
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK: Mask for clock speed field
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ: Speed of reference clock or
* crystal
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ: Speed of reference clock
* @CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ: Speed of reference clock
* @CVMX_USB_INITIALIZE_FLAGS_NO_DMA: Disable DMA and used polled IO for
* data transfer use for the USB
*/
enum cvmx_usb_initialize_flags {
CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_XI = 1 << 0,
CVMX_USB_INITIALIZE_FLAGS_CLOCK_XO_GND = 1 << 1,
CVMX_USB_INITIALIZE_FLAGS_CLOCK_MHZ_MASK = 3 << 3,
CVMX_USB_INITIALIZE_FLAGS_CLOCK_12MHZ = 1 << 3,
CVMX_USB_INITIALIZE_FLAGS_CLOCK_24MHZ = 2 << 3,
CVMX_USB_INITIALIZE_FLAGS_CLOCK_48MHZ = 3 << 3,
/* Bits 3-4 used to encode the clock frequency */
CVMX_USB_INITIALIZE_FLAGS_NO_DMA = 1 << 5,
};
/**
* enum cvmx_usb_pipe_flags - internal flags for a pipe.
*
* @__CVMX_USB_PIPE_FLAGS_OPEN: Used internally to determine if a pipe is
* open. Do not use.
* @__CVMX_USB_PIPE_FLAGS_SCHEDULED: Used internally to determine if a pipe is
* actively using hardware. Do not use.
* @__CVMX_USB_PIPE_FLAGS_NEED_PING: Used internally to determine if a high
* speed pipe is in the ping state. Do not
* use.
*/
enum cvmx_usb_pipe_flags {
__CVMX_USB_PIPE_FLAGS_OPEN = 1 << 16,
__CVMX_USB_PIPE_FLAGS_SCHEDULED = 1 << 17,
__CVMX_USB_PIPE_FLAGS_NEED_PING = 1 << 18,
};
extern int cvmx_usb_get_num_ports(void);
extern int cvmx_usb_initialize(struct cvmx_usb_state *state,
int usb_port_number);
extern int cvmx_usb_shutdown(struct cvmx_usb_state *state);
extern int cvmx_usb_enable(struct cvmx_usb_state *state);
extern int cvmx_usb_disable(struct cvmx_usb_state *state);
extern struct cvmx_usb_port_status cvmx_usb_get_status(struct cvmx_usb_state *state);
extern void cvmx_usb_set_status(struct cvmx_usb_state *state, struct cvmx_usb_port_status port_status);
extern int cvmx_usb_open_pipe(struct cvmx_usb_state *state,
int device_addr, int endpoint_num,
enum cvmx_usb_speed device_speed, int max_packet,
enum cvmx_usb_transfer transfer_type,
enum cvmx_usb_direction transfer_dir, int interval,
int multi_count, int hub_device_addr,
int hub_port);
extern int cvmx_usb_submit_bulk(struct cvmx_usb_state *state, int pipe_handle,
uint64_t buffer, int buffer_length,
cvmx_usb_callback_func_t callback,
void *user_data);
extern int cvmx_usb_submit_interrupt(struct cvmx_usb_state *state, int pipe_handle,
uint64_t buffer, int buffer_length,
cvmx_usb_callback_func_t callback,
void *user_data);
extern int cvmx_usb_submit_control(struct cvmx_usb_state *state, int pipe_handle,
uint64_t control_header,
uint64_t buffer, int buffer_length,
cvmx_usb_callback_func_t callback,
void *user_data);
extern int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state, int pipe_handle,
int start_frame,
int number_packets,
struct cvmx_usb_iso_packet packets[],
uint64_t buffer, int buffer_length,
cvmx_usb_callback_func_t callback,
void *user_data);
extern int cvmx_usb_cancel(struct cvmx_usb_state *state, int pipe_handle,
int submit_handle);
extern int cvmx_usb_cancel_all(struct cvmx_usb_state *state, int pipe_handle);
extern int cvmx_usb_close_pipe(struct cvmx_usb_state *state, int pipe_handle);
extern int cvmx_usb_register_callback(struct cvmx_usb_state *state,
enum cvmx_usb_callback reason,
cvmx_usb_callback_func_t callback,
void *user_data);
extern int cvmx_usb_get_frame_number(struct cvmx_usb_state *state);
extern int cvmx_usb_poll(struct cvmx_usb_state *state);
#endif /* __CVMX_USB_H__ */

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drivers/staging/octeon-usb/octeon-hcd.c
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