From 69c202afa8ad6d6c1c673d8f9d47b43a0a3604e5 Mon Sep 17 00:00:00 2001 From: Andrea Paterniani Date: Mon, 12 Feb 2007 00:52:39 -0800 Subject: [PATCH] SPI: Freescale iMX SPI controller driver (BIS+) 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 Signed-off-by: David Brownell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-arm/arch-imx/spi_imx.h | 72 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) create mode 100644 include/asm-arm/arch-imx/spi_imx.h (limited to 'include/asm-arm/arch-imx') diff --git a/include/asm-arm/arch-imx/spi_imx.h b/include/asm-arm/arch-imx/spi_imx.h new file mode 100644 index 000000000000..2165449e976e --- /dev/null +++ b/include/asm-arm/arch-imx/spi_imx.h @@ -0,0 +1,72 @@ +/* + * include/asm-arm/arch-imx/spi_imx.h + * + * Copyright (C) 2006 SWAPP + * Andrea Paterniani + * + * 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_*/ -- cgit v1.2.3-59-g8ed1b