LXR linux/drivers/spi/spi-fsl-lib.h

   1/*
   2 * Freescale SPI/eSPI controller driver library.
   3 *
   4 * Maintainer: Kumar Gala
   5 *
   6 * Copyright 2010 Freescale Semiconductor, Inc.
   7 * Copyright (C) 2006 Polycom, Inc.
   8 *
   9 * CPM SPI and QE buffer descriptors mode support:
  10 * Copyright (c) 2009  MontaVista Software, Inc.
  11 * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
  12 *
  13 * This program is free software; you can redistribute  it and/or modify it
  14 * under  the terms of  the GNU General  Public License as published by the
  15 * Free Software Foundation;  either version 2 of the  License, or (at your
  16 * option) any later version.
  17 */
  18#ifndef __SPI_FSL_LIB_H__
  19#define __SPI_FSL_LIB_H__
  20
  21#include <asm/io.h>
  22
  23/* SPI/eSPI Controller driver's private data. */
  24struct mpc8xxx_spi {
  25        struct device *dev;
  26        void *reg_base;
  27
  28        /* rx & tx bufs from the spi_transfer */
  29        const void *tx;
  30        void *rx;
  31#if IS_ENABLED(CONFIG_SPI_FSL_ESPI)
  32        int len;
  33#endif
  34
  35        int subblock;
  36        struct spi_pram __iomem *pram;
  37#ifdef CONFIG_FSL_SOC
  38        struct cpm_buf_desc __iomem *tx_bd;
  39        struct cpm_buf_desc __iomem *rx_bd;
  40#endif
  41
  42        struct spi_transfer *xfer_in_progress;
  43
  44        /* dma addresses for CPM transfers */
  45        dma_addr_t tx_dma;
  46        dma_addr_t rx_dma;
  47        bool map_tx_dma;
  48        bool map_rx_dma;
  49
  50        dma_addr_t dma_dummy_tx;
  51        dma_addr_t dma_dummy_rx;
  52
  53        /* functions to deal with different sized buffers */
  54        void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
  55        u32(*get_tx) (struct mpc8xxx_spi *);
  56
  57        unsigned int count;
  58        unsigned int irq;
  59
  60        unsigned nsecs;         /* (clock cycle time)/2 */
  61
  62        u32 spibrg;             /* SPIBRG input clock */
  63        u32 rx_shift;           /* RX data reg shift when in qe mode */
  64        u32 tx_shift;           /* TX data reg shift when in qe mode */
  65
  66        unsigned int flags;
  67
  68#if IS_ENABLED(CONFIG_SPI_FSL_SPI)
  69        int type;
  70        int native_chipselects;
  71        u8 max_bits_per_word;
  72
  73        void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
  74                           int bits_per_word, int msb_first);
  75#endif
  76
  77        struct completion done;
  78};
  79
  80struct spi_mpc8xxx_cs {
  81        /* functions to deal with different sized buffers */
  82        void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
  83        u32 (*get_tx) (struct mpc8xxx_spi *);
  84        u32 rx_shift;           /* RX data reg shift when in qe mode */
  85        u32 tx_shift;           /* TX data reg shift when in qe mode */
  86        u32 hw_mode;            /* Holds HW mode register settings */
  87};
  88
  89static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val)
  90{
  91        iowrite32be(val, reg);
  92}
  93
  94static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg)
  95{
  96        return ioread32be(reg);
  97}
  98
  99struct mpc8xxx_spi_probe_info {
 100        struct fsl_spi_platform_data pdata;
 101        int *gpios;
 102        bool *alow_flags;
 103};
 104
 105extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi);
 106extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi);
 107extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi);
 108extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 109extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 110extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 111
 112extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
 113                struct fsl_spi_platform_data *pdata);
 114extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
 115                struct spi_transfer *t, unsigned int len);
 116extern const char *mpc8xxx_spi_strmode(unsigned int flags);
 117extern void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
 118                unsigned int irq);
 119extern int mpc8xxx_spi_remove(struct device *dev);
 120extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev);
 121
 122#endif /* __SPI_FSL_LIB_H__ */
 123