1 /* 2 * arch/arm/mach-imx/include/mach/spi_imx.h 3 * 4 * Copyright (C) 2006 SWAPP 5 * Andrea Paterniani <a.paterniani@swapp-eng.it> 6 * 7 * Initial version inspired by: 8 * linux-2.6.17-rc3-mm1/arch/arm/mach-pxa/include/mach/pxa2xx_spi.h 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, write to the Free Software 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23 */ 24 25 #ifndef SPI_IMX_H_ 26 #define SPI_IMX_H_ 27 28 29 /*-------------------------------------------------------------------------*/ 30 /** 31 * struct spi_imx_master - device.platform_data for SPI controller devices. 32 * @num_chipselect: chipselects are used to distinguish individual 33 * SPI slaves, and are numbered from zero to num_chipselects - 1. 34 * each slave has a chipselect signal, but it's common that not 35 * every chipselect is connected to a slave. 36 * @enable_dma: if true enables DMA driven transfers. 37 */ 38 struct spi_imx_master { 39 u8 num_chipselect; 40 u8 enable_dma:1; 41 }; 42 /*-------------------------------------------------------------------------*/ 43 44 45 /*-------------------------------------------------------------------------*/ 46 /** 47 * struct spi_imx_chip - spi_board_info.controller_data for SPI 48 * slave devices, copied to spi_device.controller_data. 49 * @enable_loopback : used for test purpouse to internally connect RX and TX 50 * sections. 51 * @enable_dma : enables dma transfer (provided that controller driver has 52 * dma enabled too). 53 * @ins_ss_pulse : enable /SS pulse insertion between SPI burst. 54 * @bclk_wait : number of bclk waits between each bits_per_word SPI burst. 55 * @cs_control : function pointer to board-specific function to assert/deassert 56 * I/O port to control HW generation of devices chip-select. 57 */ 58 struct spi_imx_chip { 59 u8 enable_loopback:1; 60 u8 enable_dma:1; 61 u8 ins_ss_pulse:1; 62 u16 bclk_wait:15; 63 void (*cs_control)(u32 control); 64 }; 65 66 /* Chip-select state */ 67 #define SPI_CS_ASSERT (1 << 0) 68 #define SPI_CS_DEASSERT (1 << 1) 69 /*-------------------------------------------------------------------------*/ 70 71 72 #endif /* SPI_IMX_H_*/ 73