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Diffstat (limited to 'src/cpu/allwinner/a10')
-rw-r--r--src/cpu/allwinner/a10/twi.c40
1 files changed, 36 insertions, 4 deletions
diff --git a/src/cpu/allwinner/a10/twi.c b/src/cpu/allwinner/a10/twi.c
index 692a498a36..14e5ec7d9f 100644
--- a/src/cpu/allwinner/a10/twi.c
+++ b/src/cpu/allwinner/a10/twi.c
@@ -109,8 +109,8 @@ static void i2c_send_stop(struct a1x_twi *twi)
write32(reg32, &twi->ctl);
}
-int i2c_read(unsigned bus, unsigned chip, unsigned addr,
- unsigned alen, uint8_t *buf, unsigned len)
+static int i2c_read(unsigned bus, unsigned chip, unsigned addr,
+ uint8_t *buf, unsigned len)
{
unsigned count = len;
enum twi_status expected_status;
@@ -169,8 +169,8 @@ int i2c_read(unsigned bus, unsigned chip, unsigned addr,
return len;
}
-int i2c_write(unsigned bus, unsigned chip, unsigned addr,
- unsigned alen, const uint8_t *buf, unsigned len)
+static int i2c_write(unsigned bus, unsigned chip, unsigned addr,
+ const uint8_t *buf, unsigned len)
{
unsigned count = len;
struct a1x_twi *twi = (void *)TWI_BASE(bus);
@@ -204,3 +204,35 @@ int i2c_write(unsigned bus, unsigned chip, unsigned addr,
return len;
}
+
+
+/*
+ * This transfer function is not complete or correct, but it provides
+ * the basic support that the above read and write functions previously
+ * provided directly. It is extremely limited and not useful for
+ * advanced drivers like TPM.
+ *
+ * TODO: Rewite the i2c_transfer and supporting functions
+ *
+ */
+int i2c_transfer(unsigned bus, struct i2c_seg *segments, int count)
+{
+ struct i2c_seg *seg = segments;
+
+ if (seg->read) {
+ /* Read has one buf for the addr and one for the data */
+ if (count != 2)
+ return -1;
+
+ if(i2c_read(bus, seg->chip, *seg->buf, seg[1].buf, seg[1].len) < 0)
+ return -1;
+ } else {
+ /* Write buf has adder and data. */
+ if (count != 1)
+ return -1;
+
+ if(i2c_write(bus, seg->chip, *seg->buf, seg->buf+1, seg->len-1) < 0)
+ return -1;
+ }
+ return 0;
+}