riscv32: add ch32vx target probe

Author: perigoso

src/target/ch32f1.c

@@ -65,6 +65,11 @@ static bool ch32f1_flash_write(target_flash_s *f, target_addr_t dest, const void
 #define FLASH_SR_EOP             (1U << 5U)          // End of programming
 #define FLASH_BEGIN_ADDRESS_CH32 0x8000000U
 
+/* RISC-V targets CH32Vx */
+#define CH32VX_CHIPID               0x1ffff704U
+#define CH32VX_CHIPID_FAMILY_OFFSET 20U
+#define CH32VX_CHIPID_FAMILY_MASK   (0xfffU << CH32VX_CHIPID_FAMILY_OFFSET)
+
 /* "fast" Flash driver for CH32F10x chips */
 static void ch32f1_add_flash(target_s *t, uint32_t addr, size_t length, size_t erasesize)
 {
@@ -215,6 +220,63 @@ bool ch32f1_probe(target_s *t)
 	return true;
 }
 
+bool ch32vx_probe(target_s *t)
+{
+	/* CHIPID table
+ *	CH32V303CBT6: 0x303305x4
+ *	CH32V303RBT6: 0x303205x4
+ *	CH32V303RCT6: 0x303105x4
+ *	CH32V303VCT6: 0x303005x4
+ *	CH32V305FBP6: 0x305205x8
+ *	CH32V305RBT6: 0x305005x8
+ *	CH32V307WCU6: 0x307305x8
+ *	CH32V307FBP6: 0x307205x8
+ *	CH32V307RCT6: 0x307105x8
+ *	CH32V307VCT6: 0x307005x8
+ */
+
+	const uint32_t chipid = target_mem_read32(t, CH32VX_CHIPID);
+	switch (chipid & 0xffffff0f) {
+	case 0x30330504U: /* CH32V303CBT6 */
+	case 0x30320504U: /* CH32V303RBT6 */
+	case 0x30310504U: /* CH32V303RCT6 */
+	case 0x30300504U: /* CH32V303VCT6 */
+	case 0x30520508U: /* CH32V305FBP6 */
+	case 0x30500508U: /* CH32V305RBT6 */
+	case 0x30730508U: /* CH32V307WCU6 */
+	case 0x30720508U: /* CH32V307FBP6 */
+	case 0x30710508U: /* CH32V307RCT6 */
+	case 0x30700508U: /* CH32V307VCT6 */
+		break;
+	default:
+		return false;
+		break;
+	}
+
+	DEBUG_WARN("CH32V CHIPID 0x%" PRIx32 " \n", chipid);
+
+	const uint16_t family = (chipid & CH32VX_CHIPID_FAMILY_MASK) >> CH32VX_CHIPID_FAMILY_OFFSET;
+	switch (family) {
+	case 0x303U:
+		t->driver = "CH32V303";
+		break;
+	case 0x305U:
+		t->driver = "CH32V305";
+		break;
+	case 0x307U:
+		t->driver = "CH32V307";
+		break;
+	default:
+		return false;
+		break;
+	}
+	DEBUG_WARN("CH32V family 0x%" PRIx32 " \n", family);
+
+	t->part_id = chipid;
+
+	return true;
+}
+
 /* Fast erase of CH32 devices */
 bool ch32f1_flash_erase(target_flash_s *f, target_addr_t addr, size_t len)
 {

src/target/riscv32.c

@@ -101,6 +101,9 @@ bool riscv32_probe(target_s *const target)
 	case JEP106_MANUFACTURER_RV_GIGADEVICE:
 		PROBE(gd32vf1_probe);
 		break;
+	case JEP106_MANUFACTURER_WCH:
+		PROBE(ch32vx_probe);
+		break;
 	}
 #if PC_HOSTED == 0
 	gdb_outf("Please report unknown device with Designer 0x%x\n", target->designer_code);

src/target/target_probe.c

@@ -75,6 +75,7 @@ CORTEXM_PROBE_WEAK_NOP(nrf51_mdm_probe)
 CORTEXM_PROBE_WEAK_NOP(efm32_aap_probe)
 CORTEXM_PROBE_WEAK_NOP(rp_rescue_probe)
 
+TARGET_PROBE_WEAK_NOP(ch32vx_probe)
 TARGET_PROBE_WEAK_NOP(ch32f1_probe)
 TARGET_PROBE_WEAK_NOP(gd32f1_probe)
 TARGET_PROBE_WEAK_NOP(gd32vf1_probe)

src/target/target_probe.h

@@ -40,6 +40,7 @@ bool nrf51_mdm_probe(adiv5_access_port_s *ap);
 bool efm32_aap_probe(adiv5_access_port_s *ap);
 bool rp_rescue_probe(adiv5_access_port_s *ap);
 
+bool ch32vx_probe(target_s *t);
 bool ch32f1_probe(target_s *t);  // will catch all the clones
 bool at32fxx_probe(target_s *t); // STM32 clones from Artery
 bool mm32l0xx_probe(target_s *t);