drivers/spi/dw_spi.h

   1 #ifndef DW_SPI_HEADER_H
   2 #define DW_SPI_HEADER_H
   3
   4 #include <linux/io.h>
   5 #include <linux/scatterlist.h>
   6
   7 /* Bit fields in CTRLR0 */
   8 #define SPI_DFS_OFFSET                  0
   9
  10 #define SPI_FRF_OFFSET                  4
  11 #define SPI_FRF_SPI                     0x0
  12 #define SPI_FRF_SSP                     0x1
  13 #define SPI_FRF_MICROWIRE               0x2
  14 #define SPI_FRF_RESV                    0x3
  15
  16 #define SPI_MODE_OFFSET                 6
  17 #define SPI_SCPH_OFFSET                 6
  18 #define SPI_SCOL_OFFSET                 7
  19
  20 #define SPI_TMOD_OFFSET                 8
  21 #define SPI_TMOD_MASK                   (0x3 << SPI_TMOD_OFFSET)
  22 #define SPI_TMOD_TR                     0x0             /* xmit & recv */
  23 #define SPI_TMOD_TO                     0x1             /* xmit only */
  24 #define SPI_TMOD_RO                     0x2             /* recv only */
  25 #define SPI_TMOD_EPROMREAD              0x3             /* eeprom read mode */
  26
  27 #define SPI_SLVOE_OFFSET                10
  28 #define SPI_SRL_OFFSET                  11
  29 #define SPI_CFS_OFFSET                  12
  30
  31 /* Bit fields in SR, 7 bits */
  32 #define SR_MASK                         0x7f            /* cover 7 bits */
  33 #define SR_BUSY                         (1 << 0)
  34 #define SR_TF_NOT_FULL                  (1 << 1)
  35 #define SR_TF_EMPT                      (1 << 2)
  36 #define SR_RF_NOT_EMPT                  (1 << 3)
  37 #define SR_RF_FULL                      (1 << 4)
  38 #define SR_TX_ERR                       (1 << 5)
  39 #define SR_DCOL                         (1 << 6)
  40
  41 /* Bit fields in ISR, IMR, RISR, 7 bits */
  42 #define SPI_INT_TXEI                    (1 << 0)
  43 #define SPI_INT_TXOI                    (1 << 1)
  44 #define SPI_INT_RXUI                    (1 << 2)
  45 #define SPI_INT_RXOI                    (1 << 3)
  46 #define SPI_INT_RXFI                    (1 << 4)
  47 #define SPI_INT_MSTI                    (1 << 5)
  48
  49 /* TX RX interrupt level threshold, max can be 256 */
  50 #define SPI_INT_THRESHOLD               32
  51
  52 enum dw_ssi_type {
  53         SSI_MOTO_SPI = 0,
  54         SSI_TI_SSP,
  55         SSI_NS_MICROWIRE,
  56 };
  57
  58 struct dw_spi_reg {
  59         u32     ctrl0;
  60         u32     ctrl1;
  61         u32     ssienr;
  62         u32     mwcr;
  63         u32     ser;
  64         u32     baudr;
  65         u32     txfltr;
  66         u32     rxfltr;
  67         u32     txflr;
  68         u32     rxflr;
  69         u32     sr;
  70         u32     imr;
  71         u32     isr;
  72         u32     risr;
  73         u32     txoicr;
  74         u32     rxoicr;
  75         u32     rxuicr;
  76         u32     msticr;
  77         u32     icr;
  78         u32     dmacr;
  79         u32     dmatdlr;
  80         u32     dmardlr;
  81         u32     idr;
  82         u32     version;
  83         u32     dr;             /* Currently oper as 32 bits,
  84                                 though only low 16 bits matters */
  85 } __packed;
  86
  87 struct dw_spi;
  88 struct dw_spi_dma_ops {
  89         int (*dma_init)(struct dw_spi *dws);
  90         void (*dma_exit)(struct dw_spi *dws);
  91         int (*dma_transfer)(struct dw_spi *dws, int cs_change);
  92 };
  93
  94 struct dw_spi {
  95         struct spi_master       *master;
  96         struct spi_device       *cur_dev;
  97         struct device           *parent_dev;
  98         enum dw_ssi_type        type;
  99
 100         void __iomem            *regs;
 101         unsigned long           paddr;
 102         u32                     iolen;
 103         int                     irq;
 104         u32                     fifo_len;       /* depth of the FIFO buffer */
 105         u32                     max_freq;       /* max bus freq supported */
 106
 107         u16                     bus_num;
 108         u16                     num_cs;         /* supported slave numbers */
 109
 110         /* Driver message queue */
 111         struct workqueue_struct *workqueue;
 112         struct work_struct      pump_messages;
 113         spinlock_t              lock;
 114         struct list_head        queue;
 115         int                     busy;
 116         int                     run;
 117
 118         /* Message Transfer pump */
 119         struct tasklet_struct   pump_transfers;
 120
 121         /* Current message transfer state info */
 122         struct spi_message      *cur_msg;
 123         struct spi_transfer     *cur_transfer;
 124         struct chip_data        *cur_chip;
 125         struct chip_data        *prev_chip;
 126         size_t                  len;
 127         void                    *tx;
 128         void                    *tx_end;
 129         void                    *rx;
 130         void                    *rx_end;
 131         int                     dma_mapped;
 132         dma_addr_t              rx_dma;
 133         dma_addr_t              tx_dma;
 134         size_t                  rx_map_len;
 135         size_t                  tx_map_len;
 136         u8                      n_bytes;        /* current is a 1/2 bytes op */
 137         u8                      max_bits_per_word;      /* maxim is 16b */
 138         u32                     dma_width;
 139         int                     cs_change;
 140         int                     (*write)(struct dw_spi *dws);
 141         int                     (*read)(struct dw_spi *dws);
 142         irqreturn_t             (*transfer_handler)(struct dw_spi *dws);
 143         void                    (*cs_control)(u32 command);
 144
 145         /* Dma info */
 146         int                     dma_inited;
 147         struct dma_chan         *txchan;
 148         struct scatterlist      tx_sgl;
 149         struct dma_chan         *rxchan;
 150         struct scatterlist      rx_sgl;
 151         int                     dma_chan_done;
 152         struct device           *dma_dev;
 153         dma_addr_t              dma_addr; /* phy address of the Data register */
 154         struct dw_spi_dma_ops   *dma_ops;
 155         void                    *dma_priv; /* platform relate info */
 156         struct pci_dev          *dmac;
 157
 158         /* Bus interface info */
 159         void                    *priv;
 160 #ifdef CONFIG_DEBUG_FS
 161         struct dentry *debugfs;
 162 #endif
 163 };
 164
 165 #define dw_readl(dw, name) \
 166         __raw_readl(&(((struct dw_spi_reg *)dw->regs)->name))
 167 #define dw_writel(dw, name, val) \
 168         __raw_writel((val), &(((struct dw_spi_reg *)dw->regs)->name))
 169 #define dw_readw(dw, name) \
 170         __raw_readw(&(((struct dw_spi_reg *)dw->regs)->name))
 171 #define dw_writew(dw, name, val) \
 172         __raw_writew((val), &(((struct dw_spi_reg *)dw->regs)->name))
 173
 174 static inline void spi_enable_chip(struct dw_spi *dws, int enable)
 175 {
 176         dw_writel(dws, ssienr, (enable ? 1 : 0));
 177 }
 178
 179 static inline void spi_set_clk(struct dw_spi *dws, u16 div)
 180 {
 181         dw_writel(dws, baudr, div);
 182 }
 183
 184 static inline void spi_chip_sel(struct dw_spi *dws, u16 cs)
 185 {
 186         if (cs > dws->num_cs)
 187                 return;
 188
 189         if (dws->cs_control)
 190                 dws->cs_control(1);
 191
 192         dw_writel(dws, ser, 1 << cs);
 193 }
 194
 195 /* Disable IRQ bits */
 196 static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
 197 {
 198         u32 new_mask;
 199
 200         new_mask = dw_readl(dws, imr) & ~mask;
 201         dw_writel(dws, imr, new_mask);
 202 }
 203
 204 /* Enable IRQ bits */
 205 static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
 206 {
 207         u32 new_mask;
 208
 209         new_mask = dw_readl(dws, imr) | mask;
 210         dw_writel(dws, imr, new_mask);
 211 }
 212
 213 /*
 214  * Each SPI slave device to work with dw_api controller should
 215  * has such a structure claiming its working mode (PIO/DMA etc),
 216  * which can be save in the "controller_data" member of the
 217  * struct spi_device
 218  */
 219 struct dw_spi_chip {
 220         u8 poll_mode;   /* 0 for contoller polling mode */
 221         u8 type;        /* SPI/SSP/Micrwire */
 222         u8 enable_dma;
 223         void (*cs_control)(u32 command);
 224 };
 225
 226 extern int dw_spi_add_host(struct dw_spi *dws);
 227 extern void dw_spi_remove_host(struct dw_spi *dws);
 228 extern int dw_spi_suspend_host(struct dw_spi *dws);
 229 extern int dw_spi_resume_host(struct dw_spi *dws);
 230 extern void dw_spi_xfer_done(struct dw_spi *dws);
 231
 232 /* platform related setup */
 233 extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */
 234 #endif /* DW_SPI_HEADER_H */