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| |
| /** |
| * "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 to pass 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_AUTO: Automatically determine clock type |
| * based on function in |
| * cvmx-helper-board.c. |
| * @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_AUTO = 0, |
| 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 - flags for passing when a pipe is created. |
| * Currently no flags need to be passed. |
| * |
| * @__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, |
| enum cvmx_usb_initialize_flags flags); |
| 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, |
| enum cvmx_usb_pipe_flags flags, |
| 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); |
| |
| /** |
| * enum cvmx_usb_isochronous_flags - flags to pass the |
| * cvmx_usb_submit_isochronous() function. |
| * |
| * @CVMX_USB_ISOCHRONOUS_FLAGS_ALLOW_SHORT: Do not return an error if a transfer |
| * is less than the maximum packet size |
| * of the device. |
| * @CVMX_USB_ISOCHRONOUS_FLAGS_ASAP: Schedule the transaction as soon as |
| * possible. |
| */ |
| enum cvmx_usb_isochronous_flags { |
| CVMX_USB_ISOCHRONOUS_FLAGS_ALLOW_SHORT = 1 << 0, |
| CVMX_USB_ISOCHRONOUS_FLAGS_ASAP = 1 << 1, |
| }; |
| |
| extern int cvmx_usb_submit_isochronous(struct cvmx_usb_state *state, int pipe_handle, |
| int start_frame, int flags, |
| 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__ */ |
