drivers/spi/atmel_spi.h

   1 /*
   2  * Register definitions for the Atmel AT32/AT91 SPI Controller
   3  */
   4
   5 /* Register offsets */
   6 #include <linux/bitops.h>
   7 #define ATMEL_SPI_CR                    0x0000
   8 #define ATMEL_SPI_MR                    0x0004
   9 #define ATMEL_SPI_RDR                   0x0008
  10 #define ATMEL_SPI_TDR                   0x000c
  11 #define ATMEL_SPI_SR                    0x0010
  12 #define ATMEL_SPI_IER                   0x0014
  13 #define ATMEL_SPI_IDR                   0x0018
  14 #define ATMEL_SPI_IMR                   0x001c
  15 #define ATMEL_SPI_CSR(x)                (0x0030 + 4 * (x))
  16 #define ATMEL_SPI_VERSION               0x00fc
  17
  18 /* Bits in CR */
  19 #define ATMEL_SPI_CR_SPIEN              BIT(0)
  20 #define ATMEL_SPI_CR_SPIDIS             BIT(1)
  21 #define ATMEL_SPI_CR_SWRST              BIT(7)
  22 #define ATMEL_SPI_CR_LASTXFER           BIT(24)
  23
  24 /* Bits in MR */
  25 #define ATMEL_SPI_MR_MSTR               BIT(0)
  26 #define ATMEL_SPI_MR_PS                 BIT(1)
  27 #define ATMEL_SPI_MR_PCSDEC             BIT(2)
  28 #define ATMEL_SPI_MR_FDIV               BIT(3)
  29 #define ATMEL_SPI_MR_MODFDIS            BIT(4)
  30 #define ATMEL_SPI_MR_WDRBT              BIT(5)
  31 #define ATMEL_SPI_MR_LLB                BIT(7)
  32 #define ATMEL_SPI_MR_PCS(x)             (((x) & 15) << 16)
  33 #define ATMEL_SPI_MR_DLYBCS(x)          ((x) << 24)
  34
  35 /* Bits in RDR */
  36 #define ATMEL_SPI_RDR_RD(x)             (x)
  37 #define ATMEL_SPI_RDR_PCS(x)            ((x) << 16)
  38
  39 /* Bits in TDR */
  40 #define ATMEL_SPI_TDR_TD(x)             (x)
  41 #define ATMEL_SPI_TDR_PCS(x)            ((x) << 16)
  42 #define ATMEL_SPI_TDR_LASTXFER          BIT(24)
  43
  44 /* Bits in SR/IER/IDR/IMR */
  45 #define ATMEL_SPI_SR_RDRF               BIT(0)
  46 #define ATMEL_SPI_SR_TDRE               BIT(1)
  47 #define ATMEL_SPI_SR_MODF               BIT(2)
  48 #define ATMEL_SPI_SR_OVRES              BIT(3)
  49 #define ATMEL_SPI_SR_ENDRX              BIT(4)
  50 #define ATMEL_SPI_SR_ENDTX              BIT(5)
  51 #define ATMEL_SPI_SR_RXBUFF             BIT(6)
  52 #define ATMEL_SPI_SR_TXBUFE             BIT(7)
  53 #define ATMEL_SPI_SR_NSSR               BIT(8)
  54 #define ATMEL_SPI_SR_TXEMPTY            BIT(9)
  55 #define ATMEL_SPI_SR_SPIENS             BIT(16)
  56
  57 /* Bits in CSRx */
  58 #define ATMEL_SPI_CSRx_CPOL             BIT(0)
  59 #define ATMEL_SPI_CSRx_NCPHA            BIT(1)
  60 #define ATMEL_SPI_CSRx_CSAAT            BIT(3)
  61 #define ATMEL_SPI_CSRx_BITS(x)          ((x) << 4)
  62 #define ATMEL_SPI_CSRx_SCBR(x)          ((x) << 8)
  63 #define ATMEL_SPI_CSRx_SCBR_MAX         GENMASK(7, 0)
  64 #define ATMEL_SPI_CSRx_DLYBS(x)         ((x) << 16)
  65 #define ATMEL_SPI_CSRx_DLYBCT(x)        ((x) << 24)
  66
  67 /* Bits in VERSION */
  68 #define ATMEL_SPI_VERSION_REV(x)        ((x) & 0xfff)
  69 #define ATMEL_SPI_VERSION_MFN(x)        ((x) << 16)
  70
  71 /* Constants for CSRx:BITS */
  72 #define ATMEL_SPI_BITS_8                0
  73 #define ATMEL_SPI_BITS_9                1
  74 #define ATMEL_SPI_BITS_10               2
  75 #define ATMEL_SPI_BITS_11               3
  76 #define ATMEL_SPI_BITS_12               4
  77 #define ATMEL_SPI_BITS_13               5
  78 #define ATMEL_SPI_BITS_14               6
  79 #define ATMEL_SPI_BITS_15               7
  80 #define ATMEL_SPI_BITS_16               8
  81
  82 struct atmel_spi_slave {
  83         struct spi_slave slave;
  84         void            *regs;
  85         u32             mr;
  86 };
  87
  88 static inline struct atmel_spi_slave *to_atmel_spi(struct spi_slave *slave)
  89 {
  90         return container_of(slave, struct atmel_spi_slave, slave);
  91 }
  92
  93 /* Register access macros */
  94 #define spi_readl(as, reg)                                      \
  95         readl(as->regs + ATMEL_SPI_##reg)
  96 #define spi_writel(as, reg, value)                              \
  97         writel(value, as->regs + ATMEL_SPI_##reg)
  98
  99 #if !defined(CONFIG_SYS_SPI_WRITE_TOUT)
 100 #define CONFIG_SYS_SPI_WRITE_TOUT       (5 * CONFIG_SYS_HZ)
 101 #endif