path: root/drivers/staging/westbridge/astoria/include/linux/westbridge/cyashaldoc.h

/* Cypress West Bridge API header file (cyashaldoc.h)
## ===========================
## Copyright (C) 2010  Cypress Semiconductor
##
## This program is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License
## as published by the Free Software Foundation; either version 2
## of the License, or (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 51 Franklin Street
## Fifth Floor, Boston, MA  02110-1301, USA.
## ===========================
*/

#ifndef _INCLUDED_CYASHALDOC_H_
#define _INCLUDED_CYASHALDOC_H_

#include "cyashaldef.h"

/*@@Hardware Abstraction Layer (HAL)
	Summary
	This software module is supplied by the user of the West Bridge
	API.  This module contains the software that is specific to the
	hardware implementation or operating system of the client
	system.

	* Sleep Channels *
	A sleep channel is a operating system object that provides that
	capability for one thread or process to sleep while waiting on
	the completion of some hardware event. The hardware event is
	usually processed by a hardware interrupt and the interrupt
	handler then wakes the thread or process that is sleeping.

	A sleep channel provides the mechanism for this operation.  A
	sleep channel is created and initialized during the API
	initialization. When the API needs to wait for the hardware,
	the API performs a SleepOn() operation on the sleep channel.
	When hardware event occurs, an interrupt handler processes the
	event and then performs a Wake() operation on the sleep channel
	to wake the sleeping process or thread.

	* DMA Model *
	When the West Bridge API needs to transfer USB or storage data
	to/from the West Bridge device, this is done using a "DMA"
	operation.  In this context the term DMA is used loosely as the
	West Bridge API does not really care if the data is transferred
	using a burst read or write operation, or if the data is
	transferred using programmed I/O operations.  When a "DMA"
	operation is needed, the West Bridge API calls either
	CyAsHalDmaSetupRead() or CyAsHalDmaSetupWrite() depending on the
	direction of the data flow.  The West Bridge API expects the
	"DMA" operation requested in the call to be completed and the
	registered "DMA complete" callback to be called.

	The West Bridge API looks at several factors to determine the
	size of the "DMA" request to pass to the HAL layer.  First the
	West Bridge API calls CyAsHalDmaMaxRequestSize() to determine
	the maximum amount of data the HAL layer can accept for a "DMA"
	operation on the requested endpoint.  The West Bridge API will
	never exceed this value in a "DMA" request to the HAL layer.
	The West Bridge API also sends the maximum amount of data the
	West Bridge device can accept as part of the "DMA" request. If
	the amount of data in the "DMA" request to the HAL layer
	exceeds the amount of data the West Bridge device can accept,
	it is expected that the HAL layer has the ability to break the
	request into multiple operations.

	If the HAL implementation requires the API to handle the size
	of the "DMA" requests for one or more endpoints, the value
	CY_AS_DMA_MAX_SIZE_HW_SIZE can be returned from the
	CyAsHalDmaMaxRequestSize() call.  In this case, the API assumes
	that the maximum size of each "DMA" request should be limited
	to the maximum that can be accepted by the endpoint in question.

	Notes
	See the <install>/api/hal/scm_kernel/cyashalscm_kernel.c file
	for an example of how the DMA request size can be managed by
	the HAL implementation.

	* Interrupt Handling *
	The HAL implementation is required to handle interrupts arriving
	from the West Bridge device, and call the appropriate handlers.
	If the interrupt arriving is one of PLLLOCKINT, PMINT, MBINT or
	MCUINT, the CyAsIntrServiceInterrupt API should be called to
	service the interrupt.  If the interrupt arriving is DRQINT, the
	HAL should identify the endpoint corresponding to which the DRQ
	is being generated and perform the read/write transfer from the
	West Bridge. See the <install>/api/hal/scm_kernel/
	cyashalscm_kernel.c or <install>/api/hal/fpga/cyashalfpga.c
	reference HAL implementations for examples.

	The HAL implementation can choose to poll the West Bridge
	interrupt status register instead of using interrupts.  In this
	case, the polling has to be performed from a different thread/
	task than the one running the APIs.  This is required because
	there are API calls that block on the reception of data from the
	West Bridge, which is delivered only through the interrupt
	handlers.

	* Required Functions *
	This section defines the types and functions that must be
	supplied in order to provide a complete HAL layer for the
	West Bridge API.

	Types that must be supplied:
	* CyAsHalSleepChannel

	Hardware functions that must be supplied:
	* CyAsHalWriteRegister
	* CyAsHalReadRegister
	* CyAsHalDmaSetupWrite
	* CyAsHalDmaSetupRead
	* CyAsHalDmaCancelRequest
	* CyAsHalDmaRegisterCallback
	* CyAsHalDmaMaxRequestSize
	* CyAsHalSetWakeupPin
	* CyAsHalSyncDeviceClocks
	* CyAsHalInitDevRegisters
	* CyAsHalReadRegsBeforeStandby
	* CyAsHalRestoreRegsAfterStandby

	Operating system functions that must be supplied:
	* CyAsHalAlloc
	* CyAsHalFree
	* CyAsHalCBAlloc
	* CyAsHalCBFree
	* CyAsHalMemSet
	* CyAsHalCreateSleepChannel
	* CyAsHalDestroySleepChannel
	* CyAsHalSleepOn
	* CyAsHalWake
	* CyAsHalDisableInterrupts
	* CyAsHalEnableInterrupts
	* CyAsHalSleep150
	* CyAsHalSleep
	* CyAsHalAssert
	* CyAsHalPrintMessage
	* CyAsHalIsPolling
*/

/* Summary
   This is the type that represents a sleep channel

   Description
   A sleep channel is an operating system object that, when a
   thread of control waits on the sleep channel, the thread
   sleeps until another thread signals the sleep object. This
   object is generally used when a high level API is called
   and must wait for a response that is supplied in an interrupt
   handler.  The thread calling the API is put into a sleep
   state and when the reply arrives via the interrupt handler,
   the interrupt handler wakes the sleeping thread to indicate
   that the expect reply is available.
*/
typedef struct cy_as_hal_sleep_channel {
	/* This structure is filled in with OS specific information
	to implementat a sleep channel */
	int					m_channel;
} cy_as_hal_sleep_channel;

/* Summary
   This function is called to write a register value

   Description
   This function is called to write a specific register to a
   specific value.  The tag identifies the device of interest.
   The address is relative to the base address of the West
   Bridge device.

   Returns
   Nothing

   See Also
   * CyAsHalDeviceTag
   * CyAsHalReadRegister
*/
EXTERN void
cy_as_hal_write_register(
/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag			tag,
	/* The address we are writing to */
	uint16_t				addr,
	/* The value to write to the register */
	uint16_t				value
	);

/* Summary
   This function is called to read a register value

   Description
   This function is called to read the contents of a specific
   register. The tag identifies the device of interest. The
   address is relative to the base address of the West Bridge
   device.

   Returns
   Contents of the register

   See Also
   * CyAsHalDeviceTag
   * CyAsHalWriteRegister
*/
EXTERN uint16_t
cy_as_hal_read_register(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	/* The address we are writing to */
	uint16_t addr
	);

/* Summary
   This function initiates a DMA write operation to write
   to West Bridge

   Description
   This function initiates a DMA write operation.  The request
   size will not exceed the value the HAL layer returned via
   CyAsHalDmaMaxRequestSize().  This request size may exceed
   the size of what the West Bridge device will accept as on
   packet and the HAL layer may need to divide the request
   into multiple hardware DMA operations.

   Returns
   None

   See Also
   * CyAsHalDmaSetupRead
   * CyAsHalDmaMaxRequestSize
*/
EXTERN void
cy_as_hal_dma_setup_write(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag			tag,
	/* The endpoint we are writing to */
	cy_as_end_point_number_t		ep,
	/* The data to write via DMA */
	void *buf_p,
	/* The size of the data at buf_p */
	uint32_t				size,
	/* The maximum amount of data that the endpoint
	 * can accept as one packet */
	uint16_t				maxsize
	);

/* Summary
   This function initiates a DMA read operation from West Bridge

   Description
   This function initiates a DMA read operation.  The request
   size will not exceed the value the HAL layer returned via
   CyAsHalDmaMaxRequestSize().  This request size may exceed
   the size of what the Anitoch will accept as one packet and
   the HAL layer may need to divide the request into multiple
   hardware DMA operations.

   Returns
   None

   See Also
   * CyAsHalDmaSetupRead
   * CyAsHalDmaMaxRequestSize
*/
EXTERN void
cy_as_hal_dma_setup_read(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag			tag,
	/* The endpoint we are reading from */
	cy_as_end_point_number_t		ep,
	/* The buffer to read data into */
	void *buf_p,
	/* The amount of data to read */
	uint32_t				size,
	/* The maximum amount of data that the endpoint
	 * can provide in one DMA operation */
	uint16_t				maxsize
	);

/* Summary
   This function cancels a pending DMA request

   Description
   This function cancels a pending DMA request that has been
   passed down to the hardware.  The HAL layer can elect to
   physically cancel the request if possible, or just ignore
   the results of the request if it is not possible.

   Returns
   None
*/
EXTERN void
cy_as_hal_dma_cancel_request(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag			tag,
	/* The endpoint we are reading from */
	cy_as_end_point_number_t		ep
	);

/* Summary
   This function registers a callback function to be called when
   a DMA request is completed

   Description
   This function registers a callback that is called when a request
   issued via CyAsHalDmaSetupWrite() or CyAsHalDmaSetupRead() has
   completed.

   Returns
   None

   See Also
   * CyAsHalDmaSetupWrite
   * CyAsHalDmaSetupRead
*/
EXTERN void
cy_as_hal_dma_register_callback(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	/* The callback to call when a request has completed */
	cy_as_hal_dma_complete_callback		cb
	);

/* Summary
   This function returns the maximum size of a DMA request that can
   be handled by the HAL.

   Description
   When DMA requests are passed to the HAL layer for processing,
   the HAL layer may have a limit on the size of the request that
   can be handled.  This function is called by the DMA manager for
   an endpoint when DMA is enabled to get the maximum size of data
   the HAL layer can handle. The DMA manager insures that a request
   is never sent to the HAL layer that exceeds the size returned by
   this function.

   Returns
   the maximum size of DMA request the HAL layer can handle
*/
EXTERN uint32_t
cy_as_hal_dma_max_request_size(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	/* The endpoint of interest */
	cy_as_end_point_number_t ep
	);

/* Summary
   This function sets the WAKEUP pin to a specific state on the
   West Bridge device.

   Description
   In order to enter the standby mode, the WAKEUP pin must be
   de-asserted.  In order to resume from standby mode, the WAKEUP
   pin must be asserted.  This function provides the mechanism to
   do this.

   Returns
   1 if the pin was changed, 0 if the HAL layer does not support
   changing this pin
*/
EXTERN uint32_t
cy_as_hal_set_wakeup_pin(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	/* The desired state of the wakeup pin */
	cy_bool	state
	);

/* Summary
   Synchronise the West Bridge device clocks to re-establish device
   connectivity.

   Description
   When the Astoria bridge device is working in SPI mode, a long
   period of inactivity can cause a loss of serial synchronisation
   between the processor and Astoria.  This function is called by
   the API when it detects such a condition, and is expected to take
   the action required to re-establish clock synchronisation between
   the devices.

   Returns
   CyTrue if the attempt to re-synchronise is successful,
   CyFalse if not.
 */
EXTERN cy_bool
cy_as_hal_sync_device_clocks(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	);

/* Summary
   Initialize West Bridge device registers that may have been
   modified while the device was in standby.

   Description
   The content of some West Bridge registers may be lost when
   the device is placed in standby mode.  This function restores
   these register contents so that the device can continue to
   function normally after it wakes up from standby mode.

   This function is required to perform operations only when the
   API is being used with the Astoria device in one of the PNAND
   modes or in the PSPI mode.  It can be a no-operation in all
   other cases.

   Returns
   None
 */
EXTERN void
cy_as_hal_init_dev_registers(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag,
	/* Indicates whether this is a wake-up from standby. */
	cy_bool	is_standby_wakeup
	);

/* Summary
   This function reads a set of P-port accessible device registers and
   stores their value for later use.

   Description
   The West Bridge Astoria device silicon has a known problem when
   operating in SPI mode on the P-port, where some of the device
   registers lose their value when the device goes in and out of
   standby mode.  The suggested work-around is to reset the Astoria
   device as part of the wakeup procedure from standby.

   This requires that the values of some of the P-port accessible
   registers be restored to their pre-standby values after it has
   been reset.  This HAL function can be used to read and store
   the values of these registers at the point where the device is
   being placed in standby mode.

   Returns
   None

   See Also
   * CyAsHalRestoreRegsAfterStandby
 */
EXTERN void
cy_as_hal_read_regs_before_standby(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag
	);

/* Summary
   This function restores the old values to a set of P-port
   accessible device registers.

   Description
   This function is part of the work-around to a known West
   Bridge Astoria device error when operating in SPI mode on
   the P-port.  This function is used to restore a set of
   P-port accessible registers to the values they had before
   the device was placed in standby mode.

   Returns
   None

   See Also
   * CyAsHalRestoreRegsAfterStandby
 */
EXTERN void
cy_as_hal_restore_regs_after_standby(
	/* The tag to ID a specific West Bridge device */
	cy_as_hal_device_tag tag
	);

/*
 * The functions below this comment are part of the HAL layer,
 * as the HAL layer consists of the abstraction to both the
 * hardware platform and the operating system.  However; the
 * functions below this comment all relate to the operating
 * environment and not specifically to the hardware platform
 * or specific device.
 */

/* Summary
   This function allocates a block of memory

   Description
   This is the HAL layer equivalent of the malloc() function.

   Returns
   a pointer to a block of memory

   See Also
   * CyAsHalFree
*/
EXTERN void *
cy_as_hal_alloc(
	/* The size of the memory block to allocate */
	uint32_t				size
	);

/* Summary
   This function frees a previously allocated block of memory

   Description
   This is the HAL layer equivalent of the free() function.

   Returns
   None

   See Also
   * CyAsHalAlloc
*/
EXTERN void
cy_as_hal_free(
	/* Pointer to a memory block to free */
	void *ptr
	);

/* Summary
   This function is a malloc equivalent that can be used from an
   interrupt context.

   Description
   This function is a malloc equivalent that will be called from the
   API in callbacks. This function is required to be able to provide
   memory in interrupt context.

   Notes
   For platforms where it is not possible to allocate memory in interrupt
   context, we provide a reference allocator that takes memory during
   initialization and implements malloc/free using this memory.
   See the <install>/api/hal/fpga/cyashalblkalloc.[ch] files for the
   implementation, and the <install>/api/hal/fpga/cyashalfpga.c file
   for an example of the use of this allocator.

   Returns
   A pointer to the allocated block of memory

   See Also
   * CyAsHalCBFree
   * CyAsHalAlloc
*/
EXTERN void *
cy_as_hal_c_b_alloc(
	/* The size of the memory block to allocate */
	uint32_t size
	);

/* Summary
   This function frees the memory allocated through the CyAsHalCBAlloc
   call.

   Description
   This function frees memory allocated through the CyAsHalCBAlloc
   call, and is also required to support calls from interrupt
   context.

   Returns
   None

   See Also
   * CyAsHalCBAlloc
   * CyAsHalFree
*/
EXTERN void
cy_as_hal_c_b_free(
	/* Pointer to the memory block to be freed */
	void *ptr
	);

/* Summary
   This function sets a block of memory to a specific value

   Description
   This function is the HAL layer equivalent of the memset() function.

   Returns
   None
*/
EXTERN void
cy_as_mem_set(
	/* A pointer to a block of memory to set */
	void *ptr,
	/* The value to set the memory to */
	uint8_t	value,
	/* The number of bytes to set */
	uint32_t cnt
	);

/* Summary
   This function creates or initializes a sleep channel

   Description
   This function creates or initializes a sleep channel. The
   sleep channel defined using the HAL data structure
   CyAsHalSleepChannel.

   Returns
   CyTrue is the initialization was sucessful, and CyFalse otherwise

   See Also
   * CyAsHalSleepChannel
   * CyAsHalDestroySleepChannel
   * CyAsHalSleepOn
   * CyAsHalWake
*/
EXTERN cy_bool
cy_as_hal_create_sleep_channel(
	/* Pointer to the sleep channel to create/initialize */
	cy_as_hal_sleep_channel	*chan
	);

/* Summary
   This function destroys an existing sleep channel

   Description
   This function destroys an existing sleep channel.  The sleep channel
   is of type CyAsHalSleepChannel.

   Returns
   CyTrue if the channel was destroyed, and CyFalse otherwise

   See Also
   * CyAsHalSleepChannel
   * CyAsHalCreateSleepChannel
   * CyAsHalSleepOn
   * CyAsHalWake
*/
EXTERN cy_bool
cy_as_hal_destroy_sleep_channel(
	/* The sleep channel to destroy */
	cy_as_hal_sleep_channel		chan
	);

/* Summary
   This function causes the calling process or thread to sleep until
   CyAsHalWake() is called

   Description
   This function causes the calling process or threadvto sleep.
   When CyAsHalWake() is called on the same sleep channel, this
   processes or thread is then wakened and allowed to run

   Returns
   CyTrue if the thread or process is asleep, and CyFalse otherwise

   See Also
   * CyAsHalSleepChannel
   * CyAsHalWake
*/
EXTERN cy_bool
cy_as_hal_sleep_on(
	/* The sleep channel to sleep on */
	cy_as_hal_sleep_channel chan,
	/* The maximum time to sleep in milli-seconds */
	uint32_t ms
	);

/* Summary
   This function casues the process or thread sleeping on the given
   sleep channel to wake

   Description
   This function causes the process or thread sleeping on the given
   sleep channel to wake.  The channel

   Returns
   CyTrue if the thread or process is awake, and CyFalse otherwise

   See Also
   * CyAsHalSleepChannel
   * CyAsHalSleepOn
*/
EXTERN cy_bool
cy_as_hal_wake(
	/* The sleep channel to wake */
	cy_as_hal_sleep_channel		chan
	);

/* Summary
   This function disables interrupts, insuring that short bursts
   of code can be run without danger of interrupt handlers running.

   Description
   There are cases within the API when lists must be manipulated by
   both the API and the associated interrupt handlers.  In these
   cases, interrupts must be disabled to insure the integrity of the
   list during the modification. This function is used to disable
   interrupts during the short intervals where these lists are being
   changed.

   The HAL must have the ability to nest calls to
   CyAsHalDisableInterrupts and CyAsHalEnableInterrupts.

   Returns
   Any interrupt related state value which will be passed back into
   the subsequent CyAsHalEnableInterrupts call.

   See Also
   * CyAsHalEnableInterrupts
*/
EXTERN uint32_t
cy_as_hal_disable_interrupts();

/* Summary
   This function re-enables interrupts after a critical section of
   code in the API has been completed.

   Description
   There are cases within the API when lists must be manipulated by
   both the API and the associated interrupt handlers.  In these
   cases, interrupts must be disabled to insure the integrity of the
   list during the modification.  This function is used to enable
   interrupts after the short intervals where these lists are being
   changed.

   See Also
   * CyAsHalDisableInterrupts
*/
EXTERN void
cy_as_hal_enable_interrupts(
	/* Value returned by the previous CyAsHalDisableInterrupts call. */
	uint32_t value
	);

/* Summary
   This function sleeps for 150 ns.

   Description
   This function sleeps for 150 ns before allowing the calling function
   to continue.  This function is used for a specific purpose and the
   sleep required is at least 150 ns.
*/
EXTERN void
cy_as_hal_sleep150(
		);

/* Summary
   This function sleeps for the given number of milliseconds

   Description
   This function sleeps for at least the given number of milliseonds
*/
EXTERN void
cy_as_hal_sleep(
		uint32_t ms
		);

/* Summary
   This function asserts when the condition evaluates to zero

   Description
   Within the API there are conditions which are checked to insure
   the integrity of the code. These conditions are checked only
   within a DEBUG build. This function is used to check the condition
   and if the result evaluates to zero, it should be considered a
   fatal error that should be reported to Cypress.
*/
EXTERN void
cy_as_hal_assert(
	/* The condition to evaluate */
	cy_bool	cond
	);

/* Summary
   This function prints a message from the API to a human readable device

   Description
   There are places within the West Bridge API where printing a message
   is useful to the debug process.  This function provides the mechanism
   to print a message.

   Returns
   NONE
*/
EXTERN void
cy_as_hal_print_message(
	/* The message to print */
	const char *fmt_p,
	...	/* Variable arguments */
	);

/* Summary
   This function reports whether the HAL implementation uses
   polling to service data coming from the West Bridge.

   Description
   This function reports whether the HAL implementation uses
   polling to service data coming from the West Bridge.

   Returns
   CyTrue if the HAL polls the West Bridge Interrupt Status registers
   to complete operations, CyFalse if the HAL is interrupt driven.
 */
EXTERN cy_bool
cy_as_hal_is_polling(
		void);

#endif