364 строки
12 KiB
C
364 строки
12 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2018 Exceet Electronics GmbH
|
|
* Copyright (C) 2018 Bootlin
|
|
*
|
|
* Author:
|
|
* Peter Pan <peterpandong@micron.com>
|
|
* Boris Brezillon <boris.brezillon@bootlin.com>
|
|
*/
|
|
|
|
#ifndef __LINUX_SPI_MEM_H
|
|
#define __LINUX_SPI_MEM_H
|
|
|
|
#include <linux/spi/spi.h>
|
|
|
|
#define SPI_MEM_OP_CMD(__opcode, __buswidth) \
|
|
{ \
|
|
.buswidth = __buswidth, \
|
|
.opcode = __opcode, \
|
|
}
|
|
|
|
#define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth) \
|
|
{ \
|
|
.nbytes = __nbytes, \
|
|
.val = __val, \
|
|
.buswidth = __buswidth, \
|
|
}
|
|
|
|
#define SPI_MEM_OP_NO_ADDR { }
|
|
|
|
#define SPI_MEM_OP_DUMMY(__nbytes, __buswidth) \
|
|
{ \
|
|
.nbytes = __nbytes, \
|
|
.buswidth = __buswidth, \
|
|
}
|
|
|
|
#define SPI_MEM_OP_NO_DUMMY { }
|
|
|
|
#define SPI_MEM_OP_DATA_IN(__nbytes, __buf, __buswidth) \
|
|
{ \
|
|
.dir = SPI_MEM_DATA_IN, \
|
|
.nbytes = __nbytes, \
|
|
.buf.in = __buf, \
|
|
.buswidth = __buswidth, \
|
|
}
|
|
|
|
#define SPI_MEM_OP_DATA_OUT(__nbytes, __buf, __buswidth) \
|
|
{ \
|
|
.dir = SPI_MEM_DATA_OUT, \
|
|
.nbytes = __nbytes, \
|
|
.buf.out = __buf, \
|
|
.buswidth = __buswidth, \
|
|
}
|
|
|
|
#define SPI_MEM_OP_NO_DATA { }
|
|
|
|
/**
|
|
* enum spi_mem_data_dir - describes the direction of a SPI memory data
|
|
* transfer from the controller perspective
|
|
* @SPI_MEM_NO_DATA: no data transferred
|
|
* @SPI_MEM_DATA_IN: data coming from the SPI memory
|
|
* @SPI_MEM_DATA_OUT: data sent to the SPI memory
|
|
*/
|
|
enum spi_mem_data_dir {
|
|
SPI_MEM_NO_DATA,
|
|
SPI_MEM_DATA_IN,
|
|
SPI_MEM_DATA_OUT,
|
|
};
|
|
|
|
/**
|
|
* struct spi_mem_op - describes a SPI memory operation
|
|
* @cmd.buswidth: number of IO lines used to transmit the command
|
|
* @cmd.opcode: operation opcode
|
|
* @addr.nbytes: number of address bytes to send. Can be zero if the operation
|
|
* does not need to send an address
|
|
* @addr.buswidth: number of IO lines used to transmit the address cycles
|
|
* @addr.val: address value. This value is always sent MSB first on the bus.
|
|
* Note that only @addr.nbytes are taken into account in this
|
|
* address value, so users should make sure the value fits in the
|
|
* assigned number of bytes.
|
|
* @dummy.nbytes: number of dummy bytes to send after an opcode or address. Can
|
|
* be zero if the operation does not require dummy bytes
|
|
* @dummy.buswidth: number of IO lanes used to transmit the dummy bytes
|
|
* @data.buswidth: number of IO lanes used to send/receive the data
|
|
* @data.dir: direction of the transfer
|
|
* @data.nbytes: number of data bytes to send/receive. Can be zero if the
|
|
* operation does not involve transferring data
|
|
* @data.buf.in: input buffer (must be DMA-able)
|
|
* @data.buf.out: output buffer (must be DMA-able)
|
|
*/
|
|
struct spi_mem_op {
|
|
struct {
|
|
u8 buswidth;
|
|
u8 opcode;
|
|
} cmd;
|
|
|
|
struct {
|
|
u8 nbytes;
|
|
u8 buswidth;
|
|
u64 val;
|
|
} addr;
|
|
|
|
struct {
|
|
u8 nbytes;
|
|
u8 buswidth;
|
|
} dummy;
|
|
|
|
struct {
|
|
u8 buswidth;
|
|
enum spi_mem_data_dir dir;
|
|
unsigned int nbytes;
|
|
union {
|
|
void *in;
|
|
const void *out;
|
|
} buf;
|
|
} data;
|
|
};
|
|
|
|
#define SPI_MEM_OP(__cmd, __addr, __dummy, __data) \
|
|
{ \
|
|
.cmd = __cmd, \
|
|
.addr = __addr, \
|
|
.dummy = __dummy, \
|
|
.data = __data, \
|
|
}
|
|
|
|
/**
|
|
* struct spi_mem_dirmap_info - Direct mapping information
|
|
* @op_tmpl: operation template that should be used by the direct mapping when
|
|
* the memory device is accessed
|
|
* @offset: absolute offset this direct mapping is pointing to
|
|
* @length: length in byte of this direct mapping
|
|
*
|
|
* These information are used by the controller specific implementation to know
|
|
* the portion of memory that is directly mapped and the spi_mem_op that should
|
|
* be used to access the device.
|
|
* A direct mapping is only valid for one direction (read or write) and this
|
|
* direction is directly encoded in the ->op_tmpl.data.dir field.
|
|
*/
|
|
struct spi_mem_dirmap_info {
|
|
struct spi_mem_op op_tmpl;
|
|
u64 offset;
|
|
u64 length;
|
|
};
|
|
|
|
/**
|
|
* struct spi_mem_dirmap_desc - Direct mapping descriptor
|
|
* @mem: the SPI memory device this direct mapping is attached to
|
|
* @info: information passed at direct mapping creation time
|
|
* @nodirmap: set to 1 if the SPI controller does not implement
|
|
* ->mem_ops->dirmap_create() or when this function returned an
|
|
* error. If @nodirmap is true, all spi_mem_dirmap_{read,write}()
|
|
* calls will use spi_mem_exec_op() to access the memory. This is a
|
|
* degraded mode that allows spi_mem drivers to use the same code
|
|
* no matter whether the controller supports direct mapping or not
|
|
* @priv: field pointing to controller specific data
|
|
*
|
|
* Common part of a direct mapping descriptor. This object is created by
|
|
* spi_mem_dirmap_create() and controller implementation of ->create_dirmap()
|
|
* can create/attach direct mapping resources to the descriptor in the ->priv
|
|
* field.
|
|
*/
|
|
struct spi_mem_dirmap_desc {
|
|
struct spi_mem *mem;
|
|
struct spi_mem_dirmap_info info;
|
|
unsigned int nodirmap;
|
|
void *priv;
|
|
};
|
|
|
|
/**
|
|
* struct spi_mem - describes a SPI memory device
|
|
* @spi: the underlying SPI device
|
|
* @drvpriv: spi_mem_driver private data
|
|
* @name: name of the SPI memory device
|
|
*
|
|
* Extra information that describe the SPI memory device and may be needed by
|
|
* the controller to properly handle this device should be placed here.
|
|
*
|
|
* One example would be the device size since some controller expose their SPI
|
|
* mem devices through a io-mapped region.
|
|
*/
|
|
struct spi_mem {
|
|
struct spi_device *spi;
|
|
void *drvpriv;
|
|
const char *name;
|
|
};
|
|
|
|
/**
|
|
* struct spi_mem_set_drvdata() - attach driver private data to a SPI mem
|
|
* device
|
|
* @mem: memory device
|
|
* @data: data to attach to the memory device
|
|
*/
|
|
static inline void spi_mem_set_drvdata(struct spi_mem *mem, void *data)
|
|
{
|
|
mem->drvpriv = data;
|
|
}
|
|
|
|
/**
|
|
* struct spi_mem_get_drvdata() - get driver private data attached to a SPI mem
|
|
* device
|
|
* @mem: memory device
|
|
*
|
|
* Return: the data attached to the mem device.
|
|
*/
|
|
static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
|
|
{
|
|
return mem->drvpriv;
|
|
}
|
|
|
|
/**
|
|
* struct spi_controller_mem_ops - SPI memory operations
|
|
* @adjust_op_size: shrink the data xfer of an operation to match controller's
|
|
* limitations (can be alignment of max RX/TX size
|
|
* limitations)
|
|
* @supports_op: check if an operation is supported by the controller
|
|
* @exec_op: execute a SPI memory operation
|
|
* @get_name: get a custom name for the SPI mem device from the controller.
|
|
* This might be needed if the controller driver has been ported
|
|
* to use the SPI mem layer and a custom name is used to keep
|
|
* mtdparts compatible.
|
|
* Note that if the implementation of this function allocates memory
|
|
* dynamically, then it should do so with devm_xxx(), as we don't
|
|
* have a ->free_name() function.
|
|
* @dirmap_create: create a direct mapping descriptor that can later be used to
|
|
* access the memory device. This method is optional
|
|
* @dirmap_destroy: destroy a memory descriptor previous created by
|
|
* ->dirmap_create()
|
|
* @dirmap_read: read data from the memory device using the direct mapping
|
|
* created by ->dirmap_create(). The function can return less
|
|
* data than requested (for example when the request is crossing
|
|
* the currently mapped area), and the caller of
|
|
* spi_mem_dirmap_read() is responsible for calling it again in
|
|
* this case.
|
|
* @dirmap_write: write data to the memory device using the direct mapping
|
|
* created by ->dirmap_create(). The function can return less
|
|
* data than requested (for example when the request is crossing
|
|
* the currently mapped area), and the caller of
|
|
* spi_mem_dirmap_write() is responsible for calling it again in
|
|
* this case.
|
|
*
|
|
* This interface should be implemented by SPI controllers providing an
|
|
* high-level interface to execute SPI memory operation, which is usually the
|
|
* case for QSPI controllers.
|
|
*
|
|
* Note on ->dirmap_{read,write}(): drivers should avoid accessing the direct
|
|
* mapping from the CPU because doing that can stall the CPU waiting for the
|
|
* SPI mem transaction to finish, and this will make real-time maintainers
|
|
* unhappy and might make your system less reactive. Instead, drivers should
|
|
* use DMA to access this direct mapping.
|
|
*/
|
|
struct spi_controller_mem_ops {
|
|
int (*adjust_op_size)(struct spi_mem *mem, struct spi_mem_op *op);
|
|
bool (*supports_op)(struct spi_mem *mem,
|
|
const struct spi_mem_op *op);
|
|
int (*exec_op)(struct spi_mem *mem,
|
|
const struct spi_mem_op *op);
|
|
const char *(*get_name)(struct spi_mem *mem);
|
|
int (*dirmap_create)(struct spi_mem_dirmap_desc *desc);
|
|
void (*dirmap_destroy)(struct spi_mem_dirmap_desc *desc);
|
|
ssize_t (*dirmap_read)(struct spi_mem_dirmap_desc *desc,
|
|
u64 offs, size_t len, void *buf);
|
|
ssize_t (*dirmap_write)(struct spi_mem_dirmap_desc *desc,
|
|
u64 offs, size_t len, const void *buf);
|
|
};
|
|
|
|
/**
|
|
* struct spi_mem_driver - SPI memory driver
|
|
* @spidrv: inherit from a SPI driver
|
|
* @probe: probe a SPI memory. Usually where detection/initialization takes
|
|
* place
|
|
* @remove: remove a SPI memory
|
|
* @shutdown: take appropriate action when the system is shutdown
|
|
*
|
|
* This is just a thin wrapper around a spi_driver. The core takes care of
|
|
* allocating the spi_mem object and forwarding the probe/remove/shutdown
|
|
* request to the spi_mem_driver. The reason we use this wrapper is because
|
|
* we might have to stuff more information into the spi_mem struct to let
|
|
* SPI controllers know more about the SPI memory they interact with, and
|
|
* having this intermediate layer allows us to do that without adding more
|
|
* useless fields to the spi_device object.
|
|
*/
|
|
struct spi_mem_driver {
|
|
struct spi_driver spidrv;
|
|
int (*probe)(struct spi_mem *mem);
|
|
int (*remove)(struct spi_mem *mem);
|
|
void (*shutdown)(struct spi_mem *mem);
|
|
};
|
|
|
|
#if IS_ENABLED(CONFIG_SPI_MEM)
|
|
int spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
|
|
const struct spi_mem_op *op,
|
|
struct sg_table *sg);
|
|
|
|
void spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
|
|
const struct spi_mem_op *op,
|
|
struct sg_table *sg);
|
|
|
|
bool spi_mem_default_supports_op(struct spi_mem *mem,
|
|
const struct spi_mem_op *op);
|
|
|
|
#else
|
|
static inline int
|
|
spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
|
|
const struct spi_mem_op *op,
|
|
struct sg_table *sg)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
|
|
static inline void
|
|
spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
|
|
const struct spi_mem_op *op,
|
|
struct sg_table *sg)
|
|
{
|
|
}
|
|
|
|
static inline
|
|
bool spi_mem_default_supports_op(struct spi_mem *mem,
|
|
const struct spi_mem_op *op)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* CONFIG_SPI_MEM */
|
|
|
|
int spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op);
|
|
|
|
bool spi_mem_supports_op(struct spi_mem *mem,
|
|
const struct spi_mem_op *op);
|
|
|
|
int spi_mem_exec_op(struct spi_mem *mem,
|
|
const struct spi_mem_op *op);
|
|
|
|
const char *spi_mem_get_name(struct spi_mem *mem);
|
|
|
|
struct spi_mem_dirmap_desc *
|
|
spi_mem_dirmap_create(struct spi_mem *mem,
|
|
const struct spi_mem_dirmap_info *info);
|
|
void spi_mem_dirmap_destroy(struct spi_mem_dirmap_desc *desc);
|
|
ssize_t spi_mem_dirmap_read(struct spi_mem_dirmap_desc *desc,
|
|
u64 offs, size_t len, void *buf);
|
|
ssize_t spi_mem_dirmap_write(struct spi_mem_dirmap_desc *desc,
|
|
u64 offs, size_t len, const void *buf);
|
|
struct spi_mem_dirmap_desc *
|
|
devm_spi_mem_dirmap_create(struct device *dev, struct spi_mem *mem,
|
|
const struct spi_mem_dirmap_info *info);
|
|
void devm_spi_mem_dirmap_destroy(struct device *dev,
|
|
struct spi_mem_dirmap_desc *desc);
|
|
|
|
int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
|
|
struct module *owner);
|
|
|
|
void spi_mem_driver_unregister(struct spi_mem_driver *drv);
|
|
|
|
#define spi_mem_driver_register(__drv) \
|
|
spi_mem_driver_register_with_owner(__drv, THIS_MODULE)
|
|
|
|
#define module_spi_mem_driver(__drv) \
|
|
module_driver(__drv, spi_mem_driver_register, \
|
|
spi_mem_driver_unregister)
|
|
|
|
#endif /* __LINUX_SPI_MEM_H */
|