drivers/spi/spi-pxa2xx.h

   1 /*
   2  * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
   3  * Copyright (C) 2013, Intel Corporation
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  */
   9
  10 #ifndef SPI_PXA2XX_H
  11 #define SPI_PXA2XX_H
  12
  13 #include <linux/atomic.h>
  14 #include <linux/dmaengine.h>
  15 #include <linux/errno.h>
  16 #include <linux/io.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/pxa2xx_ssp.h>
  20 #include <linux/scatterlist.h>
  21 #include <linux/sizes.h>
  22 #include <linux/spi/spi.h>
  23 #include <linux/spi/pxa2xx_spi.h>
  24
  25 struct driver_data {
  26         /* Driver model hookup */
  27         struct platform_device *pdev;
  28
  29         /* SSP Info */
  30         struct ssp_device *ssp;
  31
  32         /* SPI framework hookup */
  33         enum pxa_ssp_type ssp_type;
  34         struct spi_master *master;
  35
  36         /* PXA hookup */
  37         struct pxa2xx_spi_master *master_info;
  38
  39         /* SSP register addresses */
  40         void __iomem *ioaddr;
  41         u32 ssdr_physical;
  42
  43         /* SSP masks*/
  44         u32 dma_cr1;
  45         u32 int_cr1;
  46         u32 clear_sr;
  47         u32 mask_sr;
  48
  49         /* Message Transfer pump */
  50         struct tasklet_struct pump_transfers;
  51
  52         /* DMA engine support */
  53         atomic_t dma_running;
  54
  55         /* Current message transfer state info */
  56         struct spi_transfer *cur_transfer;
  57         size_t len;
  58         void *tx;
  59         void *tx_end;
  60         void *rx;
  61         void *rx_end;
  62         u8 n_bytes;
  63         int (*write)(struct driver_data *drv_data);
  64         int (*read)(struct driver_data *drv_data);
  65         irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
  66         void (*cs_control)(u32 command);
  67
  68         void __iomem *lpss_base;
  69
  70         /* GPIOs for chip selects */
  71         struct gpio_desc **cs_gpiods;
  72 };
  73
  74 struct chip_data {
  75         u32 cr1;
  76         u32 dds_rate;
  77         u32 timeout;
  78         u8 n_bytes;
  79         u32 dma_burst_size;
  80         u32 threshold;
  81         u32 dma_threshold;
  82         u16 lpss_rx_threshold;
  83         u16 lpss_tx_threshold;
  84         u8 enable_dma;
  85         union {
  86                 struct gpio_desc *gpiod_cs;
  87                 unsigned int frm;
  88         };
  89         int gpio_cs_inverted;
  90         int (*write)(struct driver_data *drv_data);
  91         int (*read)(struct driver_data *drv_data);
  92         void (*cs_control)(u32 command);
  93 };
  94
  95 static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data,
  96                                   unsigned reg)
  97 {
  98         return __raw_readl(drv_data->ioaddr + reg);
  99 }
 100
 101 static  inline void pxa2xx_spi_write(const struct driver_data *drv_data,
 102                                      unsigned reg, u32 val)
 103 {
 104         __raw_writel(val, drv_data->ioaddr + reg);
 105 }
 106
 107 #define START_STATE ((void *)0)
 108 #define RUNNING_STATE ((void *)1)
 109 #define DONE_STATE ((void *)2)
 110 #define ERROR_STATE ((void *)-1)
 111
 112 #define DMA_ALIGNMENT           8
 113
 114 static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
 115 {
 116         switch (drv_data->ssp_type) {
 117         case PXA25x_SSP:
 118         case CE4100_SSP:
 119         case QUARK_X1000_SSP:
 120                 return 1;
 121         default:
 122                 return 0;
 123         }
 124 }
 125
 126 static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
 127 {
 128         if (drv_data->ssp_type == CE4100_SSP ||
 129             drv_data->ssp_type == QUARK_X1000_SSP)
 130                 val |= pxa2xx_spi_read(drv_data, SSSR) & SSSR_ALT_FRM_MASK;
 131
 132         pxa2xx_spi_write(drv_data, SSSR, val);
 133 }
 134
 135 extern int pxa2xx_spi_flush(struct driver_data *drv_data);
 136 extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
 137
 138 #define MAX_DMA_LEN             SZ_64K
 139 #define DEFAULT_DMA_CR1         (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
 140
 141 extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
 142 extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32 dma_burst);
 143 extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
 144 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
 145 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
 146 extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
 147                                                   struct spi_device *spi,
 148                                                   u8 bits_per_word,
 149                                                   u32 *burst_code,
 150                                                   u32 *threshold);
 151
 152 #endif /* SPI_PXA2XX_H */