[GitHub/mt8127/android_kernel_alcatel_ttab.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/platform_data/dma-coh901318.h>
#include <linux/err.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>
9f575d97	13	#include <linux/platform_data/dma-coh901318.h>
c7c8c78f	14	#include <linux/err.h>
ec8f1253	15
c7c8c78f LW	16	/*
	17	* The following is for the actual devices on the SSP/SPI bus
	18	*/
	19	#ifdef CONFIG_MACH_U300_SPIDUMMY
	20	static void select_dummy_chip(u32 chipselect)
	21	{
	22	pr_debug("CORE: %s called with CS=0x%x (%s)\n",
	23	__func__,
	24	chipselect,
	25	chipselect ? "unselect chip" : "select chip");
	26	/*
	27	* Here you would write the chip select value to the GPIO pins if
	28	* this was a real chip (but this is a loopback dummy).
	29	*/
	30	}
	31
	32	struct pl022_config_chip dummy_chip_info = {
ec8f1253 LW	33	/* available POLLING_TRANSFER, INTERRUPT_TRANSFER, DMA_TRANSFER */
ec8f1253 LW	34	.com_mode = DMA_TRANSFER,
c7c8c78f LW	35	.iface = SSP_INTERFACE_MOTOROLA_SPI,
	36	/* We can only act as master but SSP_SLAVE is possible in theory */
	37	.hierarchy = SSP_MASTER,
	38	/* 0 = drive TX even as slave, 1 = do not drive TX as slave */
	39	.slave_tx_disable = 0,
32d55ff9 LW	40	.rx_lev_trig = SSP_RX_4_OR_MORE_ELEM,
32d55ff9 LW	41	.tx_lev_trig = SSP_TX_4_OR_MORE_EMPTY_LOC,
c7c8c78f LW	42	.ctrl_len = SSP_BITS_12,
	43	.wait_state = SSP_MWIRE_WAIT_ZERO,
	44	.duplex = SSP_MICROWIRE_CHANNEL_FULL_DUPLEX,
	45	/*
	46	* This is where you insert a call to a function to enable CS
	47	* (usually GPIO) for a certain chip.
	48	*/
	49	.cs_control = select_dummy_chip,
	50	};
	51	#endif
	52
	53	static struct spi_board_info u300_spi_devices[] = {
	54	#ifdef CONFIG_MACH_U300_SPIDUMMY
	55	{
	56	/* A dummy chip used for loopback tests */
	57	.modalias = "spi-dummy",
	58	/* Really dummy, pass in additional chip config here */
	59	.platform_data = NULL,
	60	/* This defines how the controller shall handle the device */
	61	.controller_data = &dummy_chip_info,
	62	/* .irq - no external IRQ routed from this device */
	63	.max_speed_hz = 1000000,
	64	.bus_num = 0, /* Only one bus on this chip */
	65	.chip_select = 0,
	66	/* Means SPI_CS_HIGH, change if e.g low CS */
65289d63	67	.mode = SPI_MODE_1 \| SPI_LOOP,
c7c8c78f LW	68	},
	69	#endif
	70	};
	71
	72	static struct pl022_ssp_controller ssp_platform_data = {
	73	/* If you have several SPI buses this varies, we have only bus 0 */
	74	.bus_id = 0,
c7c8c78f LW	75	/*
	76	* On the APP CPU GPIO 4, 5 and 6 are connected as generic
	77	* chip selects for SPI. (Same on U330, U335 and U365.)
	78	* TODO: make sure the GPIO driver can select these properly
	79	* and do padmuxing accordingly too.
	80	*/
	81	.num_chipselect = 3,
ec8f1253 LW	82	#ifdef CONFIG_COH901318
	83	.enable_dma = 1,
	84	.dma_filter = coh901318_filter_id,
	85	.dma_rx_param = (void *) U300_DMA_SPI_RX,
	86	.dma_tx_param = (void *) U300_DMA_SPI_TX,
	87	#else
	88	.enable_dma = 0,
	89	#endif
c7c8c78f LW	90	};
	91
	92
	93	void __init u300_spi_init(struct amba_device *adev)
	94	{
c7c8c78f	95	adev->dev.platform_data = &ssp_platform_data;
c7c8c78f	96	}
ec8f1253	97
c7c8c78f LW	98	void __init u300_spi_register_board_devices(void)
	99	{
	100	/* Register any SPI devices */
	101	spi_register_board_info(u300_spi_devices, ARRAY_SIZE(u300_spi_devices));
	102	}