| Andrea Paterniani | 69c202a | 2007-02-12 00:52:39 -0800 | [diff] [blame] | 1 | /* |
| 2 | * include/asm-arm/arch-imx/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/include/asm-arm/arch-pxa/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_*/ |