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