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i2c: Add packet mode support (32 bytes)

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CTCaer 2020-08-27 10:04:52 +03:00
parent b20a0e74c2
commit 6714cae498
2 changed files with 161 additions and 0 deletions
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159
bdk/soc/i2c.c
View file

@ -178,6 +178,149 @@ static int _i2c_recv_single(u32 i2c_idx, u8 *buf, u32 size, u32 dev_addr)
return 1;
}
static int _i2c_send_pkt(u32 i2c_idx, u8 *buf, u32 size, u32 dev_addr, u32 reg)
{
if (size > 32)
return 0;
int res = 0;
vu32 *base = (vu32 *)i2c_addrs[i2c_idx];
// Enable interrupts.
base[I2C_INT_EN] = ALL_PACKETS_COMPLETE | PACKET_COMPLETE | NO_ACK |
ARB_LOST | TX_FIFO_OVER | RX_FIFO_UNDER | TX_FIFO_DATA_REQ;
base[I2C_INT_STATUS] = base[I2C_INT_STATUS];
// Set device address and recv mode.
base[I2C_CMD_ADDR0] = (dev_addr << 1) | ADDR0_READ;
// Set recv mode.
base[I2C_CNFG] = DEBOUNCE_CNT_4T | NEW_MASTER_FSM | CMD1_WRITE;
// Set and flush FIFO.
base[I2C_FIFO_CONTROL] = RX_FIFO_FLUSH | TX_FIFO_FLUSH;
// Load configuration.
_i2c_load_cfg_wait(base);
// Initiate transaction on packet mode.
base[I2C_CNFG] = (base[I2C_CNFG] & 0xFFFFF9FF) | PACKET_MODE_GO;
u32 hdr[3];
hdr[0] = I2C_PACKET_PROT_I2C;
hdr[1] = size - 1;
hdr[2] = I2C_HEADER_IE_ENABLE | (dev_addr << 1);
// Send header with request.
base[I2C_TX_FIFO] = hdr[0];
base[I2C_TX_FIFO] = hdr[1];
base[I2C_TX_FIFO] = hdr[2];
u32 timeout = get_tmr_ms() + 400;
while (size)
{
if (base[I2C_FIFO_STATUS] & TX_FIFO_EMPTY_CNT)
{
u32 tmp = 0;
u32 snd_size = MIN(size, 4);
memcpy(&tmp, buf, snd_size);
base[I2C_TX_FIFO] = tmp;
buf += snd_size;
size -= snd_size;
}
if (get_tmr_ms() > timeout)
{
res = 1;
break;
}
}
if (base[I2C_STATUS] & I2C_STATUS_NOACK || base[I2C_INT_STATUS] & NO_ACK)
res = 1;
// Disable packet mode.
usleep(20);
base[I2C_CNFG] &= 0xFFFFF9FF;
// Disable interrupts.
base[I2C_INT_EN] = 0;
return res;
}
static int _i2c_recv_pkt(u32 i2c_idx, u8 *buf, u32 size, u32 dev_addr, u32 reg)
{
if (size > 32)
return 0;
int res = 0;
vu32 *base = (vu32 *)i2c_addrs[i2c_idx];
// Enable interrupts.
base[I2C_INT_EN] = ALL_PACKETS_COMPLETE | PACKET_COMPLETE | NO_ACK |
ARB_LOST | TX_FIFO_OVER | RX_FIFO_UNDER | RX_FIFO_DATA_REQ;
base[I2C_INT_STATUS] = base[I2C_INT_STATUS];
// Set device address and recv mode.
base[I2C_CMD_ADDR0] = (dev_addr << 1) | ADDR0_READ;
// Set recv mode.
base[I2C_CNFG] = DEBOUNCE_CNT_4T | NEW_MASTER_FSM | CMD1_READ;
// Set and flush FIFO.
base[I2C_FIFO_CONTROL] = RX_FIFO_FLUSH | TX_FIFO_FLUSH;
// Load configuration.
_i2c_load_cfg_wait(base);
// Initiate transaction on packet mode.
base[I2C_CNFG] = (base[I2C_CNFG] & 0xFFFFF9FF) | PACKET_MODE_GO;
u32 hdr[3];
hdr[0] = I2C_PACKET_PROT_I2C;
hdr[1] = size - 1;
hdr[2] = I2C_HEADER_READ | I2C_HEADER_IE_ENABLE | (dev_addr << 1);
// Send header with request.
base[I2C_TX_FIFO] = hdr[0];
base[I2C_TX_FIFO] = hdr[1];
base[I2C_TX_FIFO] = hdr[2];
u32 timeout = get_tmr_ms() + 400;
while (size)
{
if (base[I2C_FIFO_STATUS] & RX_FIFO_FULL_CNT)
{
u32 rcv_size = MIN(size, 4);
u32 tmp = base[I2C_RX_FIFO];
memcpy(buf, &tmp, rcv_size);
buf += rcv_size;
size -= rcv_size;
}
if (get_tmr_ms() > timeout)
{
res = 1;
break;
}
}
if (base[I2C_STATUS] & I2C_STATUS_NOACK || base[I2C_INT_STATUS] & NO_ACK)
res = 1;
// Disable packet mode.
usleep(20);
base[I2C_CNFG] &= 0xFFFFF9FF;
// Disable interrupts.
base[I2C_INT_EN] = 0;
return res;
}
void i2c_init(u32 i2c_idx)
{
vu32 *base = (vu32 *)i2c_addrs[i2c_idx];
@ -204,6 +347,22 @@ int i2c_recv_buf(u8 *buf, u32 size, u32 i2c_idx, u32 dev_addr)
return _i2c_recv_single(i2c_idx, buf, size, dev_addr);
}
int i2c_send_buf_big(u32 i2c_idx, u32 dev_addr, u32 reg, u8 *buf, u32 size)
{
if (size > 32)
return 0;
return _i2c_send_pkt(i2c_idx, buf, size, dev_addr, reg);
}
int i2c_recv_buf_big(u8 *buf, u32 size, u32 i2c_idx, u32 dev_addr, u32 reg)
{
int res = _i2c_send_single(i2c_idx, dev_addr, (u8 *)&reg, 1);
if (res)
res = _i2c_recv_pkt(i2c_idx, buf, size, dev_addr, reg);
return res;
}
int i2c_send_buf_small(u32 i2c_idx, u32 dev_addr, u32 reg, u8 *buf, u32 size)
{
u8 tmp[4];

2
bdk/soc/i2c.h
View file

@ -29,6 +29,8 @@
void i2c_init(u32 i2c_idx);
int i2c_recv_buf(u8 *buf, u32 size, u32 i2c_idx, u32 dev_addr);
int i2c_send_buf_big(u32 i2c_idx, u32 dev_addr, u32 reg, u8 *buf, u32 size);
int i2c_recv_buf_big(u8 *buf, u32 size, u32 i2c_idx, u32 dev_addr, u32 reg);
int i2c_send_buf_small(u32 i2c_idx, u32 dev_addr, u32 reg, u8 *buf, u32 size);
int i2c_recv_buf_small(u8 *buf, u32 size, u32 i2c_idx, u32 dev_addr, u32 reg);
int i2c_send_byte(u32 i2c_idx, u32 dev_addr, u32 reg, u8 val);