uwire: add a chip-select for CS0, needed by the J100i display

Signed-off-by: Steve Markgraf <steve@steve-m.de>

diff --git a/src/target/firmware/calypso/uwire.c b/src/target/firmware/calypso/uwire.c
index ebdd277..b79d9f3 100644 (file)
--- a/src/target/firmware/calypso/uwire.c
+++ b/src/target/firmware/calypso/uwire.c
@@ -94,6 +94,10 @@ int uwire_xfer(int cs, int bitlen, const void *dout, void *din)
 
        printd("uwire_xfer(dev_idx=%u, bitlen=%u\n", cs, bitlen);
 
+       /* select the chip */
+       writew(UWIRE_CSR_IDX(0) | UWIRE_CSR_CS_CMD, UWIRE_REG(REG_CSR));
+       _uwire_wait(UWIRE_CSR_CSRB, 0);
+
        if (dout) {
                if (bitlen <= 8)
                        tmp = *(uint8_t *)dout;
@@ -122,6 +126,9 @@ int uwire_xfer(int cs, int bitlen, const void *dout, void *din)
                else if (bitlen <= 16)
                        *(uint16_t *)din = tmp & 0xffff;
        }
+       /* unselect the chip */
+       writew(UWIRE_CSR_IDX(0) | 0, UWIRE_REG(REG_CSR));
+       _uwire_wait(UWIRE_CSR_CSRB, 0);
 
        printd(")\n");