Function rcd_readd

src/device/dram/rcd.c:98–127

Reads a register storing its value in the host's byte order. Returns non-zero on success. */

/* Reads a register storing its value in the host's byte order. Returns non-zero on success. */
static int rcd_readd(unsigned int bus, uint8_t slave, uint8_t reg, uint32_t *data)
{
	struct i2c_msg seg[2];
	struct rcd_i2c_cmd cmd = {
		.cmd = RCD_CMD_BLOCK | RCD_CMD_RD_DWORD,
		.bytes = RCD_CMD_BYTES,
		.reg_l = reg
	};
	struct rcd_i2c_rsp rsp = { 0xaa, 0x55 };

	seg[0].flags = 0;
	seg[0].slave = slave;
	seg[0].buf   = (uint8_t *)&cmd;
	seg[0].len   = cmd.bytes + 2;  /* + .cmd and .bytes fields */

	i2c_transfer(bus, seg, 1);

	seg[0].len   = 1;	/* Send just the command again */
	seg[1].flags = I2C_M_RD;
	seg[1].slave = slave;
	seg[1].buf   = (uint8_t *)&rsp;
	seg[1].len   = RCD_RSP_BYTES + 1;  /* + .bytes field */

	i2c_transfer(bus, seg, ARRAY_SIZE(seg));

	/* Data is sent MSB to LSB, i.e. higher registers to lower. */
	*data = be32toh(rsp.ddata);

	return rsp.status == RCD_STS_SUCCESS;
}

static int rcd_writed(unsigned int bus, uint8_t slave, uint8_t reg, uint32_t data)
{