Add qemu 2.4.0

[kvmfornfv.git] / qemu / roms / u-boot / drivers / video / s6e63d6.c

diff --git a/qemu/roms/u-boot/drivers/video/s6e63d6.c b/qemu/roms/u-boot/drivers/video/s6e63d6.c
new file mode 100644 (file)
index 0000000..f077260
--- /dev/null
+++ b/qemu/roms/u-boot/drivers/video/s6e63d6.c
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2009
+ * Guennadi Liakhovetski, DENX Software Engineering, <lg@denx.de>
+ *
+ * SPDX-License-Identifier:    GPL-2.0+
+ */
+#include <common.h>
+#include <spi.h>
+#include <s6e63d6.h>
+
+/*
+ * Each transfer is performed as:
+ * 1. chip-select active
+ * 2. send 8-bit start code
+ * 3. send 16-bit data
+ * 4. chip-select inactive
+ */
+static int send_word(struct s6e63d6 *data, u8 rs, u16 word)
+{
+       /*
+        * The start byte looks like (binary):
+        * 01110<ID><RS><R/W>
+        * RS is 0 for index or 1 for data, and R/W is 0 for write.
+        */
+       u32 buf8 = 0x70 | data->id | (rs & 2);
+       u32 buf16 = cpu_to_le16(word);
+       u32 buf_in;
+       int err;
+
+       err = spi_xfer(data->slave, 8, &buf8, &buf_in, SPI_XFER_BEGIN);
+       if (err)
+               return err;
+
+       return spi_xfer(data->slave, 16, &buf16, &buf_in, SPI_XFER_END);
+}
+
+/* Index and param differ in Register Select bit */
+int s6e63d6_index(struct s6e63d6 *data, u8 idx)
+{
+       return send_word(data, 0, idx);
+}
+
+int s6e63d6_param(struct s6e63d6 *data, u16 param)
+{
+       return send_word(data, 2, param);
+}
+
+int s6e63d6_init(struct s6e63d6 *data)
+{
+       if (data->id != 0 && data->id != 4) {
+               printf("s6e63d6: invalid ID %u\n", data->id);
+               return 1;
+       }
+
+       data->slave = spi_setup_slave(data->bus, data->cs, 100000, SPI_MODE_3);
+       if (!data->slave)
+               return 1;
+
+       return 0;
+}