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/*
* Copyright (C) ST-Ericsson SA 2010
* Author: Daniel Martensson <Daniel.Martensson@stericsson.com>
* License terms: GNU General Public License (GPL) version 2
*/
#ifndef CAIF_HSI_H_
#define CAIF_HSI_H_
#include <net/caif/caif_layer.h>
#include <net/caif/caif_device.h>
/*
* Maximum number of CAIF frames that can reside in the same HSI frame.
*/
#define CFHSI_MAX_PKTS 15
/*
* Maximum number of bytes used for the frame that can be embedded in the
* HSI descriptor.
*/
#define CFHSI_MAX_EMB_FRM_SZ 96
/*
* Decides if HSI buffers should be prefilled with 0xFF pattern for easier
* debugging. Both TX and RX buffers will be filled before the transfer.
*/
#define CFHSI_DBG_PREFILL 0
/* Structure describing a HSI packet descriptor. */
struct cfhsi_desc {
u8 header;
u8 offset;
u16 cffrm_len[CFHSI_MAX_PKTS];
u8 emb_frm[CFHSI_MAX_EMB_FRM_SZ];
} __packed;
/* Size of the complete HSI packet descriptor. */
#define CFHSI_DESC_SZ (sizeof(struct cfhsi_desc))
/*
* Size of the complete HSI packet descriptor excluding the optional embedded
* CAIF frame.
*/
#define CFHSI_DESC_SHORT_SZ (CFHSI_DESC_SZ - CFHSI_MAX_EMB_FRM_SZ)
/*
* Maximum bytes transferred in one transfer.
*/
/* TODO: 4096 is temporary... */
#define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * 4096)
/* Size of the complete HSI TX buffer. */
#define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)
/* Size of the complete HSI RX buffer. */
#define CFHSI_BUF_SZ_RX ((2 * CFHSI_DESC_SZ) + CFHSI_MAX_PAYLOAD_SZ)
/* Bitmasks for the HSI descriptor. */
#define CFHSI_PIGGY_DESC (0x01 << 7)
#define CFHSI_TX_STATE_IDLE 0
#define CFHSI_TX_STATE_XFER 1
#define CFHSI_RX_STATE_DESC 0
#define CFHSI_RX_STATE_PAYLOAD 1
/* Structure implemented by the CAIF HSI driver. */
struct cfhsi_drv {
void (*tx_done_cb) (struct cfhsi_drv *drv);
void (*rx_done_cb) (struct cfhsi_drv *drv);
};
/* Structure implemented by HSI device. */
struct cfhsi_dev {
int (*cfhsi_tx) (u8 *ptr, int len, struct cfhsi_dev *dev);
int (*cfhsi_rx) (u8 *ptr, int len, struct cfhsi_dev *dev);
struct cfhsi_drv *drv;
};
/* Structure implemented by CAIF HSI drivers. */
struct cfhsi {
struct caif_dev_common cfdev;
struct net_device *ndev;
struct platform_device *pdev;
struct sk_buff_head qhead;
struct cfhsi_drv drv;
struct cfhsi_dev *dev;
int tx_state;
int rx_state;
u8 *tx_buf;
u8 *rx_buf;
spinlock_t lock;
int flow_off_sent;
u32 q_low_mark;
u32 q_high_mark;
bool flow_stop;
struct list_head list;
};
extern struct platform_driver cfhsi_driver;
#endif /* CAIF_HSI_H_ */
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