![Andrea Paterniani](/assets/img/avatar_default.png)
Add the SPI controller driver for Freescale i.MX(S/L/1). Main features summary: > Per chip setup via board specific code and/or protocol driver. > Per transfer setup. > PIO transfers. > DMA transfers. > Managing of NULL tx / rx buffer for rd only / wr only transfers. This patch replace patch-2.6.20-rc4-spi_imx with the following changes: > Few cosmetic changes. > Function map_dma_buffers now return 0 for success and -1 for failure. > Solved a bug inside spi_imx_probe function (wrong error path). > Solved a bug inside setup function (bad undo setup for max_speed_hz). > For read-only transfers, always write zero bytes. This is almost the same as the 'BIS' version sent by Andrea, except for updating the 'DUMMY' byte so that read-only transfers shift out zeroes. That part of the API changed recently, since some half duplex peripheral chips require that semantic. Signed-off-by: Andrea Paterniani <a.paterniani@swapp-eng.it> Signed-off-by: David Brownell <dbrownell@users.sourceforge.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
73 lines
2.5 KiB
C
73 lines
2.5 KiB
C
/*
|
|
* include/asm-arm/arch-imx/spi_imx.h
|
|
*
|
|
* Copyright (C) 2006 SWAPP
|
|
* Andrea Paterniani <a.paterniani@swapp-eng.it>
|
|
*
|
|
* Initial version inspired by:
|
|
* linux-2.6.17-rc3-mm1/include/asm-arm/arch-pxa/pxa2xx_spi.h
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#ifndef SPI_IMX_H_
|
|
#define SPI_IMX_H_
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
/**
|
|
* struct spi_imx_master - device.platform_data for SPI controller devices.
|
|
* @num_chipselect: chipselects are used to distinguish individual
|
|
* SPI slaves, and are numbered from zero to num_chipselects - 1.
|
|
* each slave has a chipselect signal, but it's common that not
|
|
* every chipselect is connected to a slave.
|
|
* @enable_dma: if true enables DMA driven transfers.
|
|
*/
|
|
struct spi_imx_master {
|
|
u8 num_chipselect;
|
|
u8 enable_dma:1;
|
|
};
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
/**
|
|
* struct spi_imx_chip - spi_board_info.controller_data for SPI
|
|
* slave devices, copied to spi_device.controller_data.
|
|
* @enable_loopback : used for test purpouse to internally connect RX and TX
|
|
* sections.
|
|
* @enable_dma : enables dma transfer (provided that controller driver has
|
|
* dma enabled too).
|
|
* @ins_ss_pulse : enable /SS pulse insertion between SPI burst.
|
|
* @bclk_wait : number of bclk waits between each bits_per_word SPI burst.
|
|
* @cs_control : function pointer to board-specific function to assert/deassert
|
|
* I/O port to control HW generation of devices chip-select.
|
|
*/
|
|
struct spi_imx_chip {
|
|
u8 enable_loopback:1;
|
|
u8 enable_dma:1;
|
|
u8 ins_ss_pulse:1;
|
|
u16 bclk_wait:15;
|
|
void (*cs_control)(u32 control);
|
|
};
|
|
|
|
/* Chip-select state */
|
|
#define SPI_CS_ASSERT (1 << 0)
|
|
#define SPI_CS_DEASSERT (1 << 1)
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
|
|
#endif /* SPI_IMX_H_*/
|