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. */
  24 struct 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         /* hooks for different controller driver */
  58         void (*spi_remove) (struct mpc8xxx_spi *mspi);
  59
  60         unsigned int count;
  61         unsigned int irq;
  62
  63         unsigned nsecs;         /* (clock cycle time)/2 */
  64
  65         u32 spibrg;             /* SPIBRG input clock */
  66         u32 rx_shift;           /* RX data reg shift when in qe mode */
  67         u32 tx_shift;           /* TX data reg shift when in qe mode */
  68
  69         unsigned int flags;
  70
  71 #if IS_ENABLED(CONFIG_SPI_FSL_SPI)
  72         int type;
  73         int native_chipselects;
  74         u8 max_bits_per_word;
  75
  76         void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
  77                            int bits_per_word, int msb_first);
  78 #endif
  79
  80         struct completion done;
  81 };
  82
  83 struct spi_mpc8xxx_cs {
  84         /* functions to deal with different sized buffers */
  85         void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
  86         u32 (*get_tx) (struct mpc8xxx_spi *);
  87         u32 rx_shift;           /* RX data reg shift when in qe mode */
  88         u32 tx_shift;           /* TX data reg shift when in qe mode */
  89         u32 hw_mode;            /* Holds HW mode register settings */
  90 };
  91
  92 static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val)
  93 {
  94         iowrite32be(val, reg);
  95 }
  96
  97 static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg)
  98 {
  99         return ioread32be(reg);
 100 }
 101
 102 struct mpc8xxx_spi_probe_info {
 103         struct fsl_spi_platform_data pdata;
 104         int *gpios;
 105         bool *alow_flags;
 106 };
 107
 108 extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi);
 109 extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi);
 110 extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi);
 111 extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 112 extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 113 extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 114
 115 extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
 116                 struct fsl_spi_platform_data *pdata);
 117 extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
 118                 struct spi_transfer *t, unsigned int len);
 119 extern const char *mpc8xxx_spi_strmode(unsigned int flags);
 120 extern void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
 121                 unsigned int irq);
 122 extern int mpc8xxx_spi_remove(struct device *dev);
 123 extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev);
 124
 125 #endif /* __SPI_FSL_LIB_H__ */