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4.4.0-1128-aws
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caif
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caif_spi.h
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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[2]; dma_addr_t pa_tx[2]; 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_ */