// Secondary Memory Interface definitions for Raspberry Pi
//
// v0.01 JPB 12/7/20 Adapted from rpi_smi_test v0.19

// Register definitions
#define SMI_BASE (PHYS_REG_BASE + 0x600000)
#define SMI_CS 0x00   // Control & status
#define SMI_L 0x04    // Transfer length
#define SMI_A 0x08    // Address
#define SMI_D 0x0c    // Data
#define SMI_DSR0 0x10 // Read settings device 0
#define SMI_DSW0 0x14 // Write settings device 0
#define SMI_DSR1 0x18 // Read settings device 1
#define SMI_DSW1 0x1c // Write settings device 1
#define SMI_DSR2 0x20 // Read settings device 2
#define SMI_DSW2 0x24 // Write settings device 2
#define SMI_DSR3 0x28 // Read settings device 3
#define SMI_DSW3 0x2c // Write settings device 3
#define SMI_DMC 0x30  // DMA control
#define SMI_DCS 0x34  // Direct control/status
#define SMI_DCA 0x38  // Direct address
#define SMI_DCD 0x3c  // Direct data
#define SMI_FD 0x40   // FIFO debug
#define SMI_REGLEN (SMI_FD * 4)

// Data widths
#define SMI_8_BITS 0
#define SMI_16_BITS 1
#define SMI_18_BITS 2
#define SMI_9_BITS 3

// Union of 32-bit value with register bitfields
#define REG_DEF(name, fields)                                                                      \
  typedef union {                                                                                  \
    struct {                                                                                       \
      volatile uint32_t fields;                                                                    \
    };                                                                                             \
    volatile uint32_t value;                                                                       \
  } name

// Control and status register
#define SMI_CS_FIELDS                                                                              \
  enable:                                                                                          \
  1, done : 1, active : 1, start : 1, clear : 1, write : 1, _x1 : 2, teen : 1, intd : 1, intt : 1, \
      intr : 1, pvmode : 1, seterr : 1, pxldat : 1, edreq : 1, _x2 : 8, _x3 : 1, aferr : 1,        \
      txw : 1, rxr : 1, txd : 1, rxd : 1, txe : 1, rxf : 1
REG_DEF(SMI_CS_REG, SMI_CS_FIELDS);

// Data length register
#define SMI_L_FIELDS                                                                               \
  len:                                                                                             \
  32
REG_DEF(SMI_L_REG, SMI_L_FIELDS);

// Address & device number
#define SMI_A_FIELDS                                                                               \
  addr:                                                                                            \
  6, _x1 : 2, dev : 2
REG_DEF(SMI_A_REG, SMI_A_FIELDS);

// Data FIFO
#define SMI_D_FIELDS                                                                               \
  data:                                                                                            \
  32
REG_DEF(SMI_D_REG, SMI_D_FIELDS);

// DMA control register
#define SMI_DMC_FIELDS                                                                             \
  reqw:                                                                                            \
  6, reqr : 6, panicw : 6, panicr : 6, dmap : 1, _x1 : 3, dmaen : 1
REG_DEF(SMI_DMC_REG, SMI_DMC_FIELDS);

// Device settings: read (1 of 4)
#define SMI_DSR_FIELDS                                                                             \
  rstrobe:                                                                                         \
  7, rdreq : 1, rpace : 7, rpaceall : 1, rhold : 6, fsetup : 1, mode68 : 1, rsetup : 6, rwidth : 2
REG_DEF(SMI_DSR_REG, SMI_DSR_FIELDS);

// Device settings: write (1 of 4)
#define SMI_DSW_FIELDS                                                                             \
  wstrobe:                                                                                         \
  7, wdreq : 1, wpace : 7, wpaceall : 1, whold : 6, wswap : 1, wformat : 1, wsetup : 6, wwidth : 2
REG_DEF(SMI_DSW_REG, SMI_DSW_FIELDS);

// Direct control register
#define SMI_DCS_FIELDS                                                                             \
  enable:                                                                                          \
  1, start : 1, done : 1, write : 1
REG_DEF(SMI_DCS_REG, SMI_DCS_FIELDS);

// Direct control address & device number
#define SMI_DCA_FIELDS                                                                             \
  addr:                                                                                            \
  6, _x1 : 2, dev : 2
REG_DEF(SMI_DCA_REG, SMI_DCA_FIELDS);

// Direct control data
#define SMI_DCD_FIELDS                                                                             \
  data:                                                                                            \
  32
REG_DEF(SMI_DCD_REG, SMI_DCD_FIELDS);

// Debug register
#define SMI_FLVL_FIELDS                                                                            \
  fcnt:                                                                                            \
  6, _x1 : 2, flvl : 6
REG_DEF(SMI_FLVL_REG, SMI_FLVL_FIELDS);

#define CLK_SMI_CTL 0xb0
#define CLK_SMI_DIV 0xb4

// EOF