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-rw-r--r--arch/arm/include/asm/arch-tegra/tegra_i2c.h2
-rw-r--r--drivers/i2c/tegra_i2c.c44
2 files changed, 29 insertions, 17 deletions
diff --git a/arch/arm/include/asm/arch-tegra/tegra_i2c.h b/arch/arm/include/asm/arch-tegra/tegra_i2c.h
index 853e59b..7ca6907 100644
--- a/arch/arm/include/asm/arch-tegra/tegra_i2c.h
+++ b/arch/arm/include/asm/arch-tegra/tegra_i2c.h
@@ -124,6 +124,8 @@ struct i2c_ctlr {
/* bit fields definitions for IO Packet Header 3 format */
#define PKT_HDR3_READ_MODE_SHIFT 19
#define PKT_HDR3_READ_MODE_MASK (1 << PKT_HDR3_READ_MODE_SHIFT)
+#define PKT_HDR3_REPEAT_START_SHIFT 16
+#define PKT_HDR3_REPEAT_START_MASK (1 << PKT_HDR3_REPEAT_START_SHIFT)
#define PKT_HDR3_SLAVE_ADDR_SHIFT 0
#define PKT_HDR3_SLAVE_ADDR_MASK (0x3ff << PKT_HDR3_SLAVE_ADDR_SHIFT)
diff --git a/drivers/i2c/tegra_i2c.c b/drivers/i2c/tegra_i2c.c
index 594e5dd..257b72f 100644
--- a/drivers/i2c/tegra_i2c.c
+++ b/drivers/i2c/tegra_i2c.c
@@ -110,7 +110,8 @@ static void i2c_init_controller(struct i2c_bus *i2c_bus)
static void send_packet_headers(
struct i2c_bus *i2c_bus,
struct i2c_trans_info *trans,
- u32 packet_id)
+ u32 packet_id,
+ bool end_with_repeated_start)
{
u32 data;
@@ -132,6 +133,8 @@ static void send_packet_headers(
/* Enable Read if it is not a write transaction */
if (!(trans->flags & I2C_IS_WRITE))
data |= PKT_HDR3_READ_MODE_MASK;
+ if (end_with_repeated_start)
+ data |= PKT_HDR3_REPEAT_START_MASK;
/* Write I2C specific header */
writel(data, &i2c_bus->control->tx_fifo);
@@ -209,7 +212,8 @@ static int send_recv_packets(struct i2c_bus *i2c_bus,
int_status = readl(&control->int_status);
writel(int_status, &control->int_status);
- send_packet_headers(i2c_bus, trans, 1);
+ send_packet_headers(i2c_bus, trans, 1,
+ trans->flags & I2C_USE_REPEATED_START);
words = DIV_ROUND_UP(trans->num_bytes, 4);
last_bytes = trans->num_bytes & 3;
@@ -220,14 +224,16 @@ static int send_recv_packets(struct i2c_bus *i2c_bus,
if (is_write) {
/* deal with word alignment */
- if ((unsigned)dptr & 3) {
+ if ((words == 1) && last_bytes) {
+ local = 0;
+ memcpy(&local, dptr, last_bytes);
+ } else if ((unsigned)dptr & 3) {
memcpy(&local, dptr, sizeof(u32));
- writel(local, &control->tx_fifo);
- debug("pkt data sent (0x%x)\n", local);
} else {
- writel(*wptr, &control->tx_fifo);
- debug("pkt data sent (0x%x)\n", *wptr);
+ local = *wptr;
}
+ writel(local, &control->tx_fifo);
+ debug("pkt data sent (0x%x)\n", local);
if (!wait_for_tx_fifo_empty(control)) {
error = -1;
goto exit;
@@ -267,7 +273,7 @@ exit:
}
static int tegra_i2c_write_data(struct i2c_bus *bus, u32 addr, u8 *data,
- u32 len)
+ u32 len, bool end_with_repeated_start)
{
int error;
struct i2c_trans_info trans_info;
@@ -275,6 +281,8 @@ static int tegra_i2c_write_data(struct i2c_bus *bus, u32 addr, u8 *data,
trans_info.address = addr;
trans_info.buf = data;
trans_info.flags = I2C_IS_WRITE;
+ if (end_with_repeated_start)
+ trans_info.flags |= I2C_USE_REPEATED_START;
trans_info.num_bytes = len;
trans_info.is_10bit_address = 0;
@@ -463,7 +471,8 @@ static void tegra_i2c_init(struct i2c_adapter *adap, int speed, int slaveaddr)
}
/* i2c write version without the register address */
-int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len)
+int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len,
+ bool end_with_repeated_start)
{
int rc;
@@ -475,7 +484,8 @@ int i2c_write_data(struct i2c_bus *bus, uchar chip, uchar *buffer, int len)
debug("\n");
/* Shift 7-bit address over for lower-level i2c functions */
- rc = tegra_i2c_write_data(bus, chip << 1, buffer, len);
+ rc = tegra_i2c_write_data(bus, chip << 1, buffer, len,
+ end_with_repeated_start);
if (rc)
debug("i2c_write_data(): rc=%d\n", rc);
@@ -516,7 +526,7 @@ static int tegra_i2c_probe(struct i2c_adapter *adap, uchar chip)
if (!bus)
return 1;
reg = 0;
- rc = i2c_write_data(bus, chip, &reg, 1);
+ rc = i2c_write_data(bus, chip, &reg, 1, false);
if (rc) {
debug("Error probing 0x%x.\n", chip);
return 1;
@@ -538,8 +548,8 @@ static int tegra_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
uint offset;
int i;
- debug("i2c_read: chip=0x%x, addr=0x%x, len=0x%x\n",
- chip, addr, len);
+ debug("i2c_read: chip=0x%x, addr=0x%x, alen=0x%x len=0x%x\n",
+ chip, addr, alen, len);
bus = tegra_i2c_get_bus(adap);
if (!bus)
return 1;
@@ -554,7 +564,7 @@ static int tegra_i2c_read(struct i2c_adapter *adap, uchar chip, uint addr,
data[alen - i - 1] =
(addr + offset) >> (8 * i);
}
- if (i2c_write_data(bus, chip, data, alen)) {
+ if (i2c_write_data(bus, chip, data, alen, true)) {
debug("i2c_read: error sending (0x%x)\n",
addr);
return 1;
@@ -577,8 +587,8 @@ static int tegra_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
uint offset;
int i;
- debug("i2c_write: chip=0x%x, addr=0x%x, len=0x%x\n",
- chip, addr, len);
+ debug("i2c_write: chip=0x%x, addr=0x%x, alen=0x%x len=0x%x\n",
+ chip, addr, alen, len);
bus = tegra_i2c_get_bus(adap);
if (!bus)
return 1;
@@ -591,7 +601,7 @@ static int tegra_i2c_write(struct i2c_adapter *adap, uchar chip, uint addr,
for (i = 0; i < alen; i++)
data[alen - i - 1] = (addr + offset) >> (8 * i);
data[alen] = buffer[offset];
- if (i2c_write_data(bus, chip, data, alen + 1)) {
+ if (i2c_write_data(bus, chip, data, alen + 1, false)) {
debug("i2c_write: error sending (0x%x)\n", addr);
return 1;
}
generated by cgit v1.1 at 2024-11-30 17:45:36 +0000