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 #ifdef 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_do_one_msg) (struct spi_message *m);
  59         void (*spi_remove) (struct mpc8xxx_spi *mspi);
  60
  61         unsigned int count;
  62         unsigned int irq;
  63
  64         unsigned nsecs;         /* (clock cycle time)/2 */
  65
  66         u32 spibrg;             /* SPIBRG input clock */
  67         u32 rx_shift;           /* RX data reg shift when in qe mode */
  68         u32 tx_shift;           /* TX data reg shift when in qe mode */
  69
  70         unsigned int flags;
  71
  72 #ifdef CONFIG_SPI_FSL_SPI
  73         int type;
  74         int native_chipselects;
  75         u8 max_bits_per_word;
  76
  77         void (*set_shifts)(u32 *rx_shift, u32 *tx_shift,
  78                            int bits_per_word, int msb_first);
  79 #endif
  80
  81         struct workqueue_struct *workqueue;
  82         struct work_struct work;
  83
  84         struct list_head queue;
  85         spinlock_t lock;
  86
  87         struct completion done;
  88 };
  89
  90 struct spi_mpc8xxx_cs {
  91         /* functions to deal with different sized buffers */
  92         void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
  93         u32 (*get_tx) (struct mpc8xxx_spi *);
  94         u32 rx_shift;           /* RX data reg shift when in qe mode */
  95         u32 tx_shift;           /* TX data reg shift when in qe mode */
  96         u32 hw_mode;            /* Holds HW mode register settings */
  97 };
  98
  99 static inline void mpc8xxx_spi_write_reg(__be32 __iomem *reg, u32 val)
 100 {
 101         iowrite32be(val, reg);
 102 }
 103
 104 static inline u32 mpc8xxx_spi_read_reg(__be32 __iomem *reg)
 105 {
 106         return ioread32be(reg);
 107 }
 108
 109 struct mpc8xxx_spi_probe_info {
 110         struct fsl_spi_platform_data pdata;
 111         int *gpios;
 112         bool *alow_flags;
 113 };
 114
 115 extern u32 mpc8xxx_spi_tx_buf_u8(struct mpc8xxx_spi *mpc8xxx_spi);
 116 extern u32 mpc8xxx_spi_tx_buf_u16(struct mpc8xxx_spi *mpc8xxx_spi);
 117 extern u32 mpc8xxx_spi_tx_buf_u32(struct mpc8xxx_spi *mpc8xxx_spi);
 118 extern void mpc8xxx_spi_rx_buf_u8(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 119 extern void mpc8xxx_spi_rx_buf_u16(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 120 extern void mpc8xxx_spi_rx_buf_u32(u32 data, struct mpc8xxx_spi *mpc8xxx_spi);
 121
 122 extern struct mpc8xxx_spi_probe_info *to_of_pinfo(
 123                 struct fsl_spi_platform_data *pdata);
 124 extern int mpc8xxx_spi_bufs(struct mpc8xxx_spi *mspi,
 125                 struct spi_transfer *t, unsigned int len);
 126 extern int mpc8xxx_spi_transfer(struct spi_device *spi, struct spi_message *m);
 127 extern const char *mpc8xxx_spi_strmode(unsigned int flags);
 128 extern int mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
 129                 unsigned int irq);
 130 extern int mpc8xxx_spi_remove(struct device *dev);
 131 extern int of_mpc8xxx_spi_probe(struct platform_device *ofdev);
 132
 133 #endif /* __SPI_FSL_LIB_H__ */