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Diffstat (limited to 'include/net/caif/caif_spi.h')
| -rw-r--r-- | include/net/caif/caif_spi.h | 155 |
1 files changed, 155 insertions, 0 deletions
diff --git a/include/net/caif/caif_spi.h b/include/net/caif/caif_spi.h new file mode 100644 index 000000000..aa6a485b0 --- /dev/null +++ b/include/net/caif/caif_spi.h @@ -0,0 +1,155 @@ +/* + * 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_ */ |