[deliverable/linux.git] / drivers / spi / spi-pxa2xx.h

/*
 * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
 * Copyright (C) 2013, Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#ifndef SPI_PXA2XX_H
#define SPI_PXA2XX_H

#include <linux/atomic.h>
#include <linux/dmaengine.h>
#include <linux/errno.h>
#include <linux/io.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/pxa2xx_ssp.h>
#include <linux/scatterlist.h>
#include <linux/sizes.h>
#include <linux/spi/spi.h>
#include <linux/spi/pxa2xx_spi.h>

struct driver_data {
	/* Driver model hookup */
	struct platform_device *pdev;

	/* SSP Info */
	struct ssp_device *ssp;

	/* SPI framework hookup */
	enum pxa_ssp_type ssp_type;
	struct spi_master *master;

	/* PXA hookup */
	struct pxa2xx_spi_master *master_info;

	/* SSP register addresses */
	void __iomem *ioaddr;
	u32 ssdr_physical;

	/* SSP masks*/
	u32 dma_cr1;
	u32 int_cr1;
	u32 clear_sr;
	u32 mask_sr;

	/* Message Transfer pump */
	struct tasklet_struct pump_transfers;

	/* DMA engine support */
	struct dma_chan *rx_chan;
	struct dma_chan *tx_chan;
	struct sg_table rx_sgt;
	struct sg_table tx_sgt;
	int rx_nents;
	int tx_nents;
	atomic_t dma_running;

	/* Current message transfer state info */
	struct spi_message *cur_msg;
	struct spi_transfer *cur_transfer;
	struct chip_data *cur_chip;
	size_t len;
	void *tx;
	void *tx_end;
	void *rx;
	void *rx_end;
	int dma_mapped;
	u8 n_bytes;
	int (*write)(struct driver_data *drv_data);
	int (*read)(struct driver_data *drv_data);
	irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
	void (*cs_control)(u32 command);

	void __iomem *lpss_base;
};

struct chip_data {
	u32 cr1;
	u32 dds_rate;
	u32 timeout;
	u8 n_bytes;
	u32 dma_burst_size;
	u32 threshold;
	u32 dma_threshold;
	u16 lpss_rx_threshold;
	u16 lpss_tx_threshold;
	u8 enable_dma;
	union {
		int gpio_cs;
		unsigned int frm;
	};
	int gpio_cs_inverted;
	int (*write)(struct driver_data *drv_data);
	int (*read)(struct driver_data *drv_data);
	void (*cs_control)(u32 command);
};

static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
				  unsigned reg)
{
	return __raw_readl(drv_data->ioaddr + reg);
}

static  inline void pxa2xx_spi_write(const struct driver_data *drv_data,
				     unsigned reg, u32 val)
{
	__raw_writel(val, drv_data->ioaddr + reg);
}

#define START_STATE ((void *)0)
#define RUNNING_STATE ((void *)1)
#define DONE_STATE ((void *)2)
#define ERROR_STATE ((void *)-1)

#define IS_DMA_ALIGNED(x)	IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
#define DMA_ALIGNMENT		8

static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
{
	switch (drv_data->ssp_type) {
	case PXA25x_SSP:
	case CE4100_SSP:
	case QUARK_X1000_SSP:
		return 1;
	default:
		return 0;
	}
}

static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
{
	if (drv_data->ssp_type == CE4100_SSP ||
	    drv_data->ssp_type == QUARK_X1000_SSP)
		val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;

	pxa2xx_spi_write(drv_data, SSSR, val);
}

extern int pxa2xx_spi_flush(struct driver_data *drv_data);
extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);

#define MAX_DMA_LEN		SZ_64K
#define DEFAULT_DMA_CR1		(SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)

extern bool pxa2xx_spi_dma_is_possible(size_t len);
extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
						  struct spi_device *spi,
						  u8 bits_per_word,
						  u32 *burst_code,
						  u32 *threshold);

#endif /* SPI_PXA2XX_H */
Commit	Line	Data
cd7bed00 MW	1	/*
	2	* Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
	3	* Copyright (C) 2013, Intel Corporation
	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#ifndef SPI_PXA2XX_H
	11	#define SPI_PXA2XX_H
	12
5928808e MW	13	#include <linux/atomic.h>
5928808e MW	14	#include <linux/dmaengine.h>
cd7bed00 MW	15	#include <linux/errno.h>
	16	#include <linux/io.h>
	17	#include <linux/interrupt.h>
	18	#include <linux/platform_device.h>
	19	#include <linux/pxa2xx_ssp.h>
5928808e MW	20	#include <linux/scatterlist.h>
5928808e MW	21	#include <linux/sizes.h>
cd7bed00 MW	22	#include <linux/spi/spi.h>
	23	#include <linux/spi/pxa2xx_spi.h>
	24
	25	struct driver_data {
	26	/* Driver model hookup */
	27	struct platform_device *pdev;
	28
	29	/* SSP Info */
	30	struct ssp_device *ssp;
	31
	32	/* SPI framework hookup */
	33	enum pxa_ssp_type ssp_type;
	34	struct spi_master *master;
	35
	36	/* PXA hookup */
	37	struct pxa2xx_spi_master *master_info;
	38
cd7bed00 MW	39	/* SSP register addresses */
	40	void __iomem *ioaddr;
	41	u32 ssdr_physical;
	42
	43	/* SSP masks*/
	44	u32 dma_cr1;
	45	u32 int_cr1;
	46	u32 clear_sr;
	47	u32 mask_sr;
	48
cd7bed00 MW	49	/* Message Transfer pump */
	50	struct tasklet_struct pump_transfers;
	51
5928808e MW	52	/* DMA engine support */
	53	struct dma_chan *rx_chan;
	54	struct dma_chan *tx_chan;
	55	struct sg_table rx_sgt;
	56	struct sg_table tx_sgt;
	57	int rx_nents;
	58	int tx_nents;
5928808e MW	59	atomic_t dma_running;
5928808e MW	60
cd7bed00 MW	61	/* Current message transfer state info */
	62	struct spi_message *cur_msg;
	63	struct spi_transfer *cur_transfer;
	64	struct chip_data *cur_chip;
	65	size_t len;
	66	void *tx;
	67	void *tx_end;
	68	void *rx;
	69	void *rx_end;
	70	int dma_mapped;
cd7bed00 MW	71	u8 n_bytes;
	72	int (write)(struct driver_data drv_data);
	73	int (read)(struct driver_data drv_data);
	74	irqreturn_t (transfer_handler)(struct driver_data drv_data);
	75	void (*cs_control)(u32 command);
a0d2642e MW	76
a0d2642e MW	77	void __iomem *lpss_base;
cd7bed00 MW	78	};
	79
	80	struct chip_data {
cd7bed00	81	u32 cr1;
e5262d05	82	u32 dds_rate;
cd7bed00 MW	83	u32 timeout;
	84	u8 n_bytes;
	85	u32 dma_burst_size;
	86	u32 threshold;
	87	u32 dma_threshold;
a0d2642e MW	88	u16 lpss_rx_threshold;
a0d2642e MW	89	u16 lpss_tx_threshold;
cd7bed00	90	u8 enable_dma;
cd7bed00 MW	91	union {
	92	int gpio_cs;
	93	unsigned int frm;
	94	};
	95	int gpio_cs_inverted;
	96	int (write)(struct driver_data drv_data);
	97	int (read)(struct driver_data drv_data);
	98	void (*cs_control)(u32 command);
	99	};
	100
c039dd27 JN	101	static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
	102	unsigned reg)
	103	{
	104	return __raw_readl(drv_data->ioaddr + reg);
	105	}
	106
	107	static inline void pxa2xx_spi_write(const struct driver_data *drv_data,
	108	unsigned reg, u32 val)
	109	{
	110	__raw_writel(val, drv_data->ioaddr + reg);
	111	}
cd7bed00 MW	112
	113	#define START_STATE ((void *)0)
	114	#define RUNNING_STATE ((void *)1)
	115	#define DONE_STATE ((void *)2)
	116	#define ERROR_STATE ((void *)-1)
	117
cd7bed00 MW	118	#define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x), DMA_ALIGNMENT)
	119	#define DMA_ALIGNMENT 8
	120
	121	static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
	122	{
e5262d05 WC	123	switch (drv_data->ssp_type) {
	124	case PXA25x_SSP:
	125	case CE4100_SSP:
	126	case QUARK_X1000_SSP:
cd7bed00	127	return 1;
e5262d05 WC	128	default:
	129	return 0;
	130	}
cd7bed00 MW	131	}
	132
	133	static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
	134	{
e5262d05 WC	135	if (drv_data->ssp_type == CE4100_SSP \|\|
e5262d05 WC	136	drv_data->ssp_type == QUARK_X1000_SSP)
c039dd27	137	val \|= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
cd7bed00	138
c039dd27	139	pxa2xx_spi_write(drv_data, SSSR, val);
cd7bed00 MW	140	}
	141
	142	extern int pxa2xx_spi_flush(struct driver_data *drv_data);
	143	extern void pxa2xx_spi_next_transfer(struct driver_data drv_data);
	144
5928808e MW	145	#define MAX_DMA_LEN SZ_64K
5928808e MW	146	#define DEFAULT_DMA_CR1 (SSCR1_TSRE \| SSCR1_RSRE \| SSCR1_TRAIL)
5928808e	147
cd7bed00 MW	148	extern bool pxa2xx_spi_dma_is_possible(size_t len);
	149	extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
	150	extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
	151	extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
	152	extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
	153	extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
	154	extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
cd7bed00 MW	155	extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
	156	struct spi_device *spi,
	157	u8 bits_per_word,
	158	u32 *burst_code,
	159	u32 *threshold);
cd7bed00 MW	160
cd7bed00 MW	161	#endif /* SPI_PXA2XX_H */