[deliverable/linux.git] / arch / arm / mach-u300 / spi.c

/*
 * arch/arm/mach-u300/spi.c
 *
 * Copyright (C) 2009 ST-Ericsson AB
 * License terms: GNU General Public License (GPL) version 2
 *
 * Author: Linus Walleij <linus.walleij@stericsson.com>
 */
#include <linux/device.h>
#include <linux/amba/bus.h>
#include <linux/spi/spi.h>
#include <linux/amba/pl022.h>
#include <linux/err.h>
#include <mach/coh901318.h>
#include "dma_channels.h"

/*
 * The following is for the actual devices on the SSP/SPI bus
 */
#ifdef CONFIG_MACH_U300_SPIDUMMY
static void select_dummy_chip(u32 chipselect)
{
	pr_debug("CORE: %s called with CS=0x%x (%s)\n",
		 __func__,
		 chipselect,
		 chipselect ? "unselect chip" : "select chip");
	/*
	 * Here you would write the chip select value to the GPIO pins if
	 * this was a real chip (but this is a loopback dummy).
	 */
}

struct pl022_config_chip dummy_chip_info = {
	/* available POLLING_TRANSFER, INTERRUPT_TRANSFER, DMA_TRANSFER */
	.com_mode = DMA_TRANSFER,
	.iface = SSP_INTERFACE_MOTOROLA_SPI,
	/* We can only act as master but SSP_SLAVE is possible in theory */
	.hierarchy = SSP_MASTER,
	/* 0 = drive TX even as slave, 1 = do not drive TX as slave */
	.slave_tx_disable = 0,
	.rx_lev_trig = SSP_RX_4_OR_MORE_ELEM,
	.tx_lev_trig = SSP_TX_4_OR_MORE_EMPTY_LOC,
	.ctrl_len = SSP_BITS_12,
	.wait_state = SSP_MWIRE_WAIT_ZERO,
	.duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
	/*
	 * This is where you insert a call to a function to enable CS
	 * (usually GPIO) for a certain chip.
	 */
	.cs_control = select_dummy_chip,
};
#endif

static struct spi_board_info u300_spi_devices[] = {
#ifdef CONFIG_MACH_U300_SPIDUMMY
	{
		/* A dummy chip used for loopback tests */
		.modalias       = "spi-dummy",
		/* Really dummy, pass in additional chip config here */
		.platform_data  = NULL,
		/* This defines how the controller shall handle the device */
		.controller_data = &dummy_chip_info,
		/* .irq - no external IRQ routed from this device */
		.max_speed_hz   = 1000000,
		.bus_num        = 0, /* Only one bus on this chip */
		.chip_select    = 0,
		/* Means SPI_CS_HIGH, change if e.g low CS */
		.mode           = SPI_MODE_1 | SPI_LOOP,
	},
#endif
};

static struct pl022_ssp_controller ssp_platform_data = {
	/* If you have several SPI buses this varies, we have only bus 0 */
	.bus_id = 0,
	/*
	 * On the APP CPU GPIO 4, 5 and 6 are connected as generic
	 * chip selects for SPI. (Same on U330, U335 and U365.)
	 * TODO: make sure the GPIO driver can select these properly
	 * and do padmuxing accordingly too.
	 */
	.num_chipselect = 3,
#ifdef CONFIG_COH901318
	.enable_dma = 1,
	.dma_filter = coh901318_filter_id,
	.dma_rx_param = (void *) U300_DMA_SPI_RX,
	.dma_tx_param = (void *) U300_DMA_SPI_TX,
#else
	.enable_dma = 0,
#endif
};


void __init u300_spi_init(struct amba_device *adev)
{
	adev->dev.platform_data = &ssp_platform_data;
}

void __init u300_spi_register_board_devices(void)
{
	/* Register any SPI devices */
	spi_register_board_info(u300_spi_devices, ARRAY_SIZE(u300_spi_devices));
}
Commit	Line	Data
c7c8c78f LW	1	/*
	2	* arch/arm/mach-u300/spi.c
	3	*
	4	* Copyright (C) 2009 ST-Ericsson AB
	5	* License terms: GNU General Public License (GPL) version 2
	6	*
	7	* Author: Linus Walleij <linus.walleij@stericsson.com>
	8	*/
	9	#include <linux/device.h>
	10	#include <linux/amba/bus.h>
	11	#include <linux/spi/spi.h>
	12	#include <linux/amba/pl022.h>
	13	#include <linux/err.h>
ec8f1253	14	#include <mach/coh901318.h>
8dcf4707	15	#include "dma_channels.h"
ec8f1253	16
c7c8c78f LW	17	/*
	18	* The following is for the actual devices on the SSP/SPI bus
	19	*/
	20	#ifdef CONFIG_MACH_U300_SPIDUMMY
	21	static void select_dummy_chip(u32 chipselect)
	22	{
	23	pr_debug("CORE: %s called with CS=0x%x (%s)\n",
	24	__func__,
	25	chipselect,
	26	chipselect ? "unselect chip" : "select chip");
	27	/*
	28	* Here you would write the chip select value to the GPIO pins if
	29	* this was a real chip (but this is a loopback dummy).
	30	*/
	31	}
	32
	33	struct pl022_config_chip dummy_chip_info = {
ec8f1253 LW	34	/* available POLLING_TRANSFER, INTERRUPT_TRANSFER, DMA_TRANSFER */
ec8f1253 LW	35	.com_mode = DMA_TRANSFER,
c7c8c78f LW	36	.iface = SSP_INTERFACE_MOTOROLA_SPI,
	37	/* We can only act as master but SSP_SLAVE is possible in theory */
	38	.hierarchy = SSP_MASTER,
	39	/* 0 = drive TX even as slave, 1 = do not drive TX as slave */
	40	.slave_tx_disable = 0,
32d55ff9 LW	41	.rx_lev_trig = SSP_RX_4_OR_MORE_ELEM,
32d55ff9 LW	42	.tx_lev_trig = SSP_TX_4_OR_MORE_EMPTY_LOC,
c7c8c78f LW	43	.ctrl_len = SSP_BITS_12,
	44	.wait_state = SSP_MWIRE_WAIT_ZERO,
	45	.duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
	46	/*
	47	* This is where you insert a call to a function to enable CS
	48	* (usually GPIO) for a certain chip.
	49	*/
	50	.cs_control = select_dummy_chip,
	51	};
	52	#endif
	53
	54	static struct spi_board_info u300_spi_devices[] = {
	55	#ifdef CONFIG_MACH_U300_SPIDUMMY
	56	{
	57	/* A dummy chip used for loopback tests */
	58	.modalias = "spi-dummy",
	59	/* Really dummy, pass in additional chip config here */
	60	.platform_data = NULL,
	61	/* This defines how the controller shall handle the device */
	62	.controller_data = &dummy_chip_info,
	63	/* .irq - no external IRQ routed from this device */
	64	.max_speed_hz = 1000000,
	65	.bus_num = 0, /* Only one bus on this chip */
	66	.chip_select = 0,
	67	/* Means SPI_CS_HIGH, change if e.g low CS */
65289d63	68	.mode = SPI_MODE_1 \| SPI_LOOP,
c7c8c78f LW	69	},
	70	#endif
	71	};
	72
	73	static struct pl022_ssp_controller ssp_platform_data = {
	74	/* If you have several SPI buses this varies, we have only bus 0 */
	75	.bus_id = 0,
c7c8c78f LW	76	/*
	77	* On the APP CPU GPIO 4, 5 and 6 are connected as generic
	78	* chip selects for SPI. (Same on U330, U335 and U365.)
	79	* TODO: make sure the GPIO driver can select these properly
	80	* and do padmuxing accordingly too.
	81	*/
	82	.num_chipselect = 3,
ec8f1253 LW	83	#ifdef CONFIG_COH901318
	84	.enable_dma = 1,
	85	.dma_filter = coh901318_filter_id,
	86	.dma_rx_param = (void *) U300_DMA_SPI_RX,
	87	.dma_tx_param = (void *) U300_DMA_SPI_TX,
	88	#else
	89	.enable_dma = 0,
	90	#endif
c7c8c78f LW	91	};
	92
	93
	94	void __init u300_spi_init(struct amba_device *adev)
	95	{
c7c8c78f	96	adev->dev.platform_data = &ssp_platform_data;
c7c8c78f	97	}
ec8f1253	98
c7c8c78f LW	99	void __init u300_spi_register_board_devices(void)
	100	{
	101	/* Register any SPI devices */
	102	spi_register_board_info(u300_spi_devices, ARRAY_SIZE(u300_spi_devices));
	103	}