jtagspi/pld: add support from gatemate driver

Provide	jtagspi	with specific procedures to be able to
use jtagspi for	programming spi-flash devices on cologne
chip gatemate devices.

Change-Id: Ifa1c4ca6e215d7f49bd21620898991af213812e9
Signed-off-by: Daniel Anselmi <danselmi@gmx.ch>
Reviewed-on: https://review.openocd.org/c/openocd/+/7838
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

src/pld/gatemate.c

@@ -15,6 +15,8 @@
 #include "raw_bit.h"
 
 #define JTAG_CONFIGURE  0x06
+#define JTAG_SPI_BYPASS 0x05
+#define BYPASS          0x3F
 
 struct gatemate_pld_device {
 	struct jtag_tap *tap;
@@ -209,6 +211,66 @@ static int gatemate_load(struct pld_device *pld_device, const char *filename)
 	return retval;
 }
 
+static int gatemate_has_jtagspi_instruction(struct pld_device *device, bool *has_instruction)
+{
+	*has_instruction = true;
+	return ERROR_OK;
+}
+
+static int gatemate_connect_spi_to_jtag(struct pld_device *pld_device)
+{
+	if (!pld_device)
+		return ERROR_FAIL;
+
+	struct gatemate_pld_device *pld_device_info = pld_device->driver_priv;
+	if (!pld_device_info)
+		return ERROR_FAIL;
+
+	struct jtag_tap *tap = pld_device_info->tap;
+	if (!tap)
+		return ERROR_FAIL;
+
+	if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) == JTAG_SPI_BYPASS)
+		return ERROR_OK;
+
+	gatemate_set_instr(tap, JTAG_SPI_BYPASS);
+
+	return jtag_execute_queue();
+}
+
+static int gatemate_disconnect_spi_from_jtag(struct pld_device *pld_device)
+{
+	if (!pld_device)
+		return ERROR_FAIL;
+
+	struct gatemate_pld_device *pld_device_info = pld_device->driver_priv;
+	if (!pld_device_info)
+		return ERROR_FAIL;
+
+	struct jtag_tap *tap = pld_device_info->tap;
+	if (!tap)
+		return ERROR_FAIL;
+
+	if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != JTAG_SPI_BYPASS)
+		return ERROR_OK;
+
+	gatemate_set_instr(tap, BYPASS);
+
+	return jtag_execute_queue();
+}
+
+static int gatemate_get_stuff_bits(struct pld_device *pld_device, unsigned int *facing_read_bits,
+									unsigned int *trailing_write_bits)
+{
+	if (!pld_device)
+		return ERROR_FAIL;
+
+	*facing_read_bits = 1;
+	*trailing_write_bits = 1;
+
+	return ERROR_OK;
+}
+
 PLD_CREATE_COMMAND_HANDLER(gatemate_pld_create_command)
 {
 	if (CMD_ARGC != 4)
@@ -239,4 +301,8 @@ struct pld_driver gatemate_pld = {
 	.name = "gatemate",
 	.pld_create_command = &gatemate_pld_create_command,
 	.load = &gatemate_load,
+	.has_jtagspi_instruction = gatemate_has_jtagspi_instruction,
+	.connect_spi_to_jtag = gatemate_connect_spi_to_jtag,
+	.disconnect_spi_from_jtag = gatemate_disconnect_spi_from_jtag,
+	.get_stuff_bits = gatemate_get_stuff_bits,
 };

tcl/board/gatemate_eval.cfg

@@ -14,3 +14,9 @@ transport select jtag
 adapter speed 6000
 
 source [find fpga/gatemate.cfg]
+
+set JTAGSPI_CHAIN_ID gatemate.pld
+source [find cpld/jtagspi.cfg]
+
+#jtagspi_init gatemate.pld "" -1
+#jtagspi_program workspace/blink/blink_slow.cfg.bit 0