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/*
* Copyright (C) ST-Ericsson AB 2010
* Author: Daniel Martensson / Daniel.Martensson@stericsson.com
* License terms: GNU General Public License (GPL) version 2
*/
#ifndef CAIF_SPI_H_
#define CAIF_SPI_H_
#include <net/caif/caif_device.h>
#define SPI_CMD_WR 0x00
#define SPI_CMD_RD 0x01
#define SPI_CMD_EOT 0x02
#define SPI_CMD_IND 0x04
#define SPI_DMA_BUF_LEN 8192
#define WL_SZ 2 /* 16 bits. */
#define SPI_CMD_SZ 4 /* 32 bits. */
#define SPI_IND_SZ 4 /* 32 bits. */
#define SPI_XFER 0
#define SPI_SS_ON 1
#define SPI_SS_OFF 2
#define SPI_TERMINATE 3
/* Minimum time between different levels is 50 microseconds. */
#define MIN_TRANSITION_TIME_USEC 50
/* Defines for calculating duration of SPI transfers for a particular
* number of bytes.
*/
#define SPI_MASTER_CLK_MHZ 13
#define SPI_XFER_TIME_USEC(bytes, clk) (((bytes) * 8) / clk)
/* Normally this should be aligned on the modem in order to benefit from full
* duplex transfers. However a size of 8188 provokes errors when running with
* the modem. These errors occur when packet sizes approaches 4 kB of data.
*/
#define CAIF_MAX_SPI_FRAME 4092
/* Maximum number of uplink CAIF frames that can reside in the same SPI frame.
* This number should correspond with the modem setting. The application side
* CAIF accepts any number of embedded downlink CAIF frames.
*/
#define CAIF_MAX_SPI_PKTS 9
/* Decides if SPI buffers should be prefilled with 0xFF pattern for easier
* debugging. Both TX and RX buffers will be filled before the transfer.
*/
#define CFSPI_DBG_PREFILL 0
/* Structure describing a SPI transfer. */
struct cfspi_xfer {
u16 tx_dma_len;
u16 rx_dma_len;
void *va_tx;
dma_addr_t pa_tx;
void *va_rx;
dma_addr_t pa_rx;
};
/* Structure implemented by the SPI interface. */
struct cfspi_ifc {
void (*ss_cb) (bool assert, struct cfspi_ifc *ifc);
void (*xfer_done_cb) (struct cfspi_ifc *ifc);
void *priv;
};
/* Structure implemented by SPI clients. */
struct cfspi_dev {
int (*init_xfer) (struct cfspi_xfer *xfer, struct cfspi_dev *dev);
void (*sig_xfer) (bool xfer, struct cfspi_dev *dev);
struct cfspi_ifc *ifc;
char *name;
u32 clk_mhz;
void *priv;
};
/* Enumeration describing the CAIF SPI state. */
enum cfspi_state {
CFSPI_STATE_WAITING = 0,
CFSPI_STATE_AWAKE,
CFSPI_STATE_FETCH_PKT,
CFSPI_STATE_GET_NEXT,
CFSPI_STATE_INIT_XFER,
CFSPI_STATE_WAIT_ACTIVE,
CFSPI_STATE_SIG_ACTIVE,
CFSPI_STATE_WAIT_XFER_DONE,
CFSPI_STATE_XFER_DONE,
CFSPI_STATE_WAIT_INACTIVE,
CFSPI_STATE_SIG_INACTIVE,
CFSPI_STATE_DELIVER_PKT,
CFSPI_STATE_MAX,
};
/* Structure implemented by SPI physical interfaces. */
struct cfspi {
struct caif_dev_common cfdev;
struct net_device *ndev;
struct platform_device *pdev;
struct sk_buff_head qhead;
struct sk_buff_head chead;
u16 cmd;
u16 tx_cpck_len;
u16 tx_npck_len;
u16 rx_cpck_len;
u16 rx_npck_len;
struct cfspi_ifc ifc;
struct cfspi_xfer xfer;
struct cfspi_dev *dev;
unsigned long state;
struct work_struct work;
struct workqueue_struct *wq;
struct list_head list;
int flow_off_sent;
u32 qd_low_mark;
u32 qd_high_mark;
struct completion comp;
wait_queue_head_t wait;
spinlock_t lock;
bool flow_stop;
bool slave;
bool slave_talked;
#ifdef CONFIG_DEBUG_FS
enum cfspi_state dbg_state;
u16 pcmd;
u16 tx_ppck_len;
u16 rx_ppck_len;
struct dentry *dbgfs_dir;
struct dentry *dbgfs_state;
struct dentry *dbgfs_frame;
#endif /* CONFIG_DEBUG_FS */
};
extern int spi_frm_align;
extern int spi_up_head_align;
extern int spi_up_tail_align;
extern int spi_down_head_align;
extern int spi_down_tail_align;
extern struct platform_driver cfspi_spi_driver;
void cfspi_dbg_state(struct cfspi *cfspi, int state);
int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len);
int cfspi_xmitlen(struct cfspi *cfspi);
int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len);
int cfspi_spi_remove(struct platform_device *pdev);
int cfspi_spi_probe(struct platform_device *pdev);
int cfspi_xmitfrm(struct cfspi *cfspi, u8 *buf, size_t len);
int cfspi_xmitlen(struct cfspi *cfspi);
int cfspi_rxfrm(struct cfspi *cfspi, u8 *buf, size_t len);
void cfspi_xfer(struct work_struct *work);
#endif /* CAIF_SPI_H_ */
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