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https://github.com/AsahiLinux/u-boot
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5752d6ae8d
spi_mem_default_supports_op() rejects DTR ops by default to ensure that the controller drivers that haven't been updated with DTR support continue to reject them. It also makes sure that controllers that don't support DTR mode at all (which is most of them at the moment) also reject them. This means that controller drivers that want to support DTR mode can't use spi_mem_default_supports_op(). Driver authors have to roll their own supports_op() function and mimic the buswidth checks. Or even worse, driver authors might skip it completely or get it wrong. Add spi_mem_dtr_supports_op(). It provides a basic sanity check for DTR ops and performs the buswidth requirement check. Move the logic for checking buswidth in spi_mem_default_supports_op() to a separate function so the logic is not repeated twice. Signed-off-by: Pratyush Yadav <p.yadav@ti.com> Acked-by: Jagan Teki <jagan@amarulasolutions.com>
277 lines
7.8 KiB
C
277 lines
7.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (C) 2018 Exceet Electronics GmbH
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* Copyright (C) 2018 Bootlin
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*
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* Author:
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* Peter Pan <peterpandong@micron.com>
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* Boris Brezillon <boris.brezillon@bootlin.com>
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*/
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#ifndef __UBOOT_SPI_MEM_H
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#define __UBOOT_SPI_MEM_H
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struct udevice;
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#define SPI_MEM_OP_CMD(__opcode, __buswidth) \
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{ \
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.buswidth = __buswidth, \
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.opcode = __opcode, \
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.nbytes = 1, \
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}
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#define SPI_MEM_OP_ADDR(__nbytes, __val, __buswidth) \
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{ \
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.nbytes = __nbytes, \
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.val = __val, \
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.buswidth = __buswidth, \
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}
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#define SPI_MEM_OP_NO_ADDR { }
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#define SPI_MEM_OP_DUMMY(__nbytes, __buswidth) \
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{ \
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.nbytes = __nbytes, \
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.buswidth = __buswidth, \
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}
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#define SPI_MEM_OP_NO_DUMMY { }
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#define SPI_MEM_OP_DATA_IN(__nbytes, __buf, __buswidth) \
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{ \
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.dir = SPI_MEM_DATA_IN, \
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.nbytes = __nbytes, \
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.buf.in = __buf, \
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.buswidth = __buswidth, \
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}
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#define SPI_MEM_OP_DATA_OUT(__nbytes, __buf, __buswidth) \
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{ \
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.dir = SPI_MEM_DATA_OUT, \
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.nbytes = __nbytes, \
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.buf.out = __buf, \
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.buswidth = __buswidth, \
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}
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#define SPI_MEM_OP_NO_DATA { }
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/**
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* enum spi_mem_data_dir - describes the direction of a SPI memory data
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* transfer from the controller perspective
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* @SPI_MEM_NO_DATA: no data transferred
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* @SPI_MEM_DATA_IN: data coming from the SPI memory
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* @SPI_MEM_DATA_OUT: data sent the SPI memory
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*/
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enum spi_mem_data_dir {
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SPI_MEM_NO_DATA,
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SPI_MEM_DATA_IN,
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SPI_MEM_DATA_OUT,
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};
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/**
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* struct spi_mem_op - describes a SPI memory operation
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* @cmd.nbytes: number of opcode bytes (only 1 or 2 are valid). The opcode is
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* sent MSB-first.
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* @cmd.buswidth: number of IO lines used to transmit the command
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* @cmd.opcode: operation opcode
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* @cmd.dtr: whether the command opcode should be sent in DTR mode or not
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* @addr.nbytes: number of address bytes to send. Can be zero if the operation
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* does not need to send an address
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* @addr.buswidth: number of IO lines used to transmit the address cycles
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* @addr.val: address value. This value is always sent MSB first on the bus.
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* Note that only @addr.nbytes are taken into account in this
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* address value, so users should make sure the value fits in the
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* assigned number of bytes.
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* @addr.dtr: whether the address should be sent in DTR mode or not
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* @dummy.nbytes: number of dummy bytes to send after an opcode or address. Can
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* be zero if the operation does not require dummy bytes
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* @dummy.buswidth: number of IO lanes used to transmit the dummy bytes
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* @dummy.dtr: whether the dummy bytes should be sent in DTR mode or not
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* @data.buswidth: number of IO lanes used to send/receive the data
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* @data.dtr: whether the data should be sent in DTR mode or not
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* @data.dir: direction of the transfer
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* @data.buf.in: input buffer
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* @data.buf.out: output buffer
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*/
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struct spi_mem_op {
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struct {
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u8 nbytes;
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u8 buswidth;
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u8 dtr : 1;
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u16 opcode;
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} cmd;
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struct {
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u8 nbytes;
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u8 buswidth;
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u8 dtr : 1;
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u64 val;
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} addr;
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struct {
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u8 nbytes;
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u8 buswidth;
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u8 dtr : 1;
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} dummy;
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struct {
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u8 buswidth;
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u8 dtr : 1;
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enum spi_mem_data_dir dir;
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unsigned int nbytes;
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/* buf.{in,out} must be DMA-able. */
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union {
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void *in;
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const void *out;
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} buf;
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} data;
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};
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#define SPI_MEM_OP(__cmd, __addr, __dummy, __data) \
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{ \
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.cmd = __cmd, \
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.addr = __addr, \
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.dummy = __dummy, \
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.data = __data, \
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}
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#ifndef __UBOOT__
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/**
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* struct spi_mem - describes a SPI memory device
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* @spi: the underlying SPI device
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* @drvpriv: spi_mem_driver private data
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*
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* Extra information that describe the SPI memory device and may be needed by
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* the controller to properly handle this device should be placed here.
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*
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* One example would be the device size since some controller expose their SPI
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* mem devices through a io-mapped region.
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*/
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struct spi_mem {
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struct udevice *dev;
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void *drvpriv;
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};
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/**
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* struct spi_mem_set_drvdata() - attach driver private data to a SPI mem
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* device
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* @mem: memory device
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* @data: data to attach to the memory device
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*/
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static inline void spi_mem_set_drvdata(struct spi_mem *mem, void *data)
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{
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mem->drvpriv = data;
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}
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/**
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* struct spi_mem_get_drvdata() - get driver private data attached to a SPI mem
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* device
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* @mem: memory device
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*
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* Return: the data attached to the mem device.
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*/
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static inline void *spi_mem_get_drvdata(struct spi_mem *mem)
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{
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return mem->drvpriv;
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}
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#endif /* __UBOOT__ */
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/**
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* struct spi_controller_mem_ops - SPI memory operations
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* @adjust_op_size: shrink the data xfer of an operation to match controller's
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* limitations (can be alignment of max RX/TX size
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* limitations)
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* @supports_op: check if an operation is supported by the controller
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* @exec_op: execute a SPI memory operation
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*
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* This interface should be implemented by SPI controllers providing an
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* high-level interface to execute SPI memory operation, which is usually the
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* case for QSPI controllers.
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*/
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struct spi_controller_mem_ops {
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int (*adjust_op_size)(struct spi_slave *slave, struct spi_mem_op *op);
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bool (*supports_op)(struct spi_slave *slave,
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const struct spi_mem_op *op);
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int (*exec_op)(struct spi_slave *slave,
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const struct spi_mem_op *op);
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};
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#ifndef __UBOOT__
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/**
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* struct spi_mem_driver - SPI memory driver
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* @spidrv: inherit from a SPI driver
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* @probe: probe a SPI memory. Usually where detection/initialization takes
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* place
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* @remove: remove a SPI memory
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* @shutdown: take appropriate action when the system is shutdown
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*
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* This is just a thin wrapper around a spi_driver. The core takes care of
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* allocating the spi_mem object and forwarding the probe/remove/shutdown
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* request to the spi_mem_driver. The reason we use this wrapper is because
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* we might have to stuff more information into the spi_mem struct to let
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* SPI controllers know more about the SPI memory they interact with, and
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* having this intermediate layer allows us to do that without adding more
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* useless fields to the spi_device object.
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*/
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struct spi_mem_driver {
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struct spi_driver spidrv;
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int (*probe)(struct spi_mem *mem);
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int (*remove)(struct spi_mem *mem);
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void (*shutdown)(struct spi_mem *mem);
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};
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#if IS_ENABLED(CONFIG_SPI_MEM)
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int spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
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const struct spi_mem_op *op,
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struct sg_table *sg);
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void spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
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const struct spi_mem_op *op,
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struct sg_table *sg);
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#else
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static inline int
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spi_controller_dma_map_mem_op_data(struct spi_controller *ctlr,
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const struct spi_mem_op *op,
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struct sg_table *sg)
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{
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return -ENOSYS;
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}
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static inline void
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spi_controller_dma_unmap_mem_op_data(struct spi_controller *ctlr,
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const struct spi_mem_op *op,
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struct sg_table *sg)
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{
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}
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#endif /* CONFIG_SPI_MEM */
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#endif /* __UBOOT__ */
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int spi_mem_adjust_op_size(struct spi_slave *slave, struct spi_mem_op *op);
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bool spi_mem_supports_op(struct spi_slave *slave, const struct spi_mem_op *op);
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bool spi_mem_dtr_supports_op(struct spi_slave *slave,
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const struct spi_mem_op *op);
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bool spi_mem_default_supports_op(struct spi_slave *slave,
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const struct spi_mem_op *op);
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int spi_mem_exec_op(struct spi_slave *slave, const struct spi_mem_op *op);
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bool spi_mem_default_supports_op(struct spi_slave *mem,
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const struct spi_mem_op *op);
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#ifndef __UBOOT__
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int spi_mem_driver_register_with_owner(struct spi_mem_driver *drv,
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struct module *owner);
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void spi_mem_driver_unregister(struct spi_mem_driver *drv);
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#define spi_mem_driver_register(__drv) \
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spi_mem_driver_register_with_owner(__drv, THIS_MODULE)
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#define module_spi_mem_driver(__drv) \
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module_driver(__drv, spi_mem_driver_register, \
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spi_mem_driver_unregister)
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#endif
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#endif /* __LINUX_SPI_MEM_H */
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