5928808ef6
To be able to use DMA with this driver on non-PXA platforms we implement support for the generic DMA engine API. This lets user to use different DMA engines with little or no modification to the driver. Request lines and channel numbers can be passed to the driver from the platform specific data. The DMA engine implementation will be selected by default even on PXA platform. User can select the legacy DMA API by enabling Kconfig option CONFIG_SPI_PXA2XX_PXADMA. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Acked-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Lu Cao <lucao@marvell.com> Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
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* Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __linux_pxa2xx_spi_h
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#define __linux_pxa2xx_spi_h
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#include <linux/pxa2xx_ssp.h>
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#define PXA2XX_CS_ASSERT (0x01)
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#define PXA2XX_CS_DEASSERT (0x02)
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/* device.platform_data for SSP controller devices */
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struct pxa2xx_spi_master {
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u32 clock_enable;
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u16 num_chipselect;
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u8 enable_dma;
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/* DMA engine specific config */
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int rx_chan_id;
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int tx_chan_id;
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int rx_slave_id;
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int tx_slave_id;
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/* For non-PXA arches */
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struct ssp_device ssp;
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};
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/* spi_board_info.controller_data for SPI slave devices,
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* copied to spi_device.platform_data ... mostly for dma tuning
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*/
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struct pxa2xx_spi_chip {
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u8 tx_threshold;
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u8 rx_threshold;
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u8 dma_burst_size;
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u32 timeout;
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u8 enable_loopback;
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int gpio_cs;
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void (*cs_control)(u32 command);
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};
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#if defined(CONFIG_ARCH_PXA) || defined(CONFIG_ARCH_MMP)
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#include <linux/clk.h>
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#include <mach/dma.h>
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extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_master *info);
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#endif
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#endif
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